Commit | Line | Data |
---|---|---|
8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
ce5706bd | 4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
5d8868ff | 5 | Copyright (C) 2010 Google Inc. |
1da177e4 LT |
6 | |
7 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License version 2 as | |
11 | published by the Free Software Foundation; | |
12 | ||
13 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
14 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
15 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
16 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
17 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
18 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
19 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
20 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
21 | ||
8e87d142 YH |
22 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
23 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
24 | SOFTWARE IS DISCLAIMED. |
25 | */ | |
26 | ||
bb58f747 | 27 | /* Bluetooth L2CAP core. */ |
1da177e4 | 28 | |
1da177e4 LT |
29 | #include <linux/module.h> |
30 | ||
31 | #include <linux/types.h> | |
4fc268d2 | 32 | #include <linux/capability.h> |
1da177e4 LT |
33 | #include <linux/errno.h> |
34 | #include <linux/kernel.h> | |
1da177e4 LT |
35 | #include <linux/sched.h> |
36 | #include <linux/slab.h> | |
37 | #include <linux/poll.h> | |
38 | #include <linux/fcntl.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/interrupt.h> | |
41 | #include <linux/socket.h> | |
42 | #include <linux/skbuff.h> | |
1da177e4 | 43 | #include <linux/list.h> |
be9d1227 | 44 | #include <linux/device.h> |
aef7d97c MH |
45 | #include <linux/debugfs.h> |
46 | #include <linux/seq_file.h> | |
af05b30b | 47 | #include <linux/uaccess.h> |
fcc203c3 | 48 | #include <linux/crc16.h> |
1da177e4 LT |
49 | #include <net/sock.h> |
50 | ||
51 | #include <asm/system.h> | |
1da177e4 LT |
52 | #include <asm/unaligned.h> |
53 | ||
54 | #include <net/bluetooth/bluetooth.h> | |
55 | #include <net/bluetooth/hci_core.h> | |
56 | #include <net/bluetooth/l2cap.h> | |
57 | ||
bb58f747 | 58 | int disable_ertm; |
f0709e03 | 59 | |
47ec1dcd | 60 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
e1027a7c | 61 | static u8 l2cap_fixed_chan[8] = { 0x02, }; |
1da177e4 | 62 | |
1890d36b GP |
63 | static struct workqueue_struct *_busy_wq; |
64 | ||
bb58f747 | 65 | struct bt_sock_list l2cap_sk_list = { |
d5fb2962 | 66 | .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock) |
1da177e4 LT |
67 | }; |
68 | ||
1890d36b GP |
69 | static void l2cap_busy_work(struct work_struct *work); |
70 | ||
1da177e4 LT |
71 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
72 | u8 code, u8 ident, u16 dlen, void *data); | |
73 | ||
218bb9df GP |
74 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); |
75 | ||
0139418c MH |
76 | /* ---- L2CAP channels ---- */ |
77 | static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid) | |
78 | { | |
79 | struct sock *s; | |
80 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
81 | if (l2cap_pi(s)->dcid == cid) | |
82 | break; | |
83 | } | |
84 | return s; | |
85 | } | |
86 | ||
87 | static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
88 | { | |
89 | struct sock *s; | |
90 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
91 | if (l2cap_pi(s)->scid == cid) | |
92 | break; | |
93 | } | |
94 | return s; | |
95 | } | |
96 | ||
97 | /* Find channel with given SCID. | |
98 | * Returns locked socket */ | |
99 | static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
100 | { | |
101 | struct sock *s; | |
102 | read_lock(&l->lock); | |
103 | s = __l2cap_get_chan_by_scid(l, cid); | |
af05b30b GP |
104 | if (s) |
105 | bh_lock_sock(s); | |
0139418c MH |
106 | read_unlock(&l->lock); |
107 | return s; | |
108 | } | |
109 | ||
110 | static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) | |
111 | { | |
112 | struct sock *s; | |
113 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
114 | if (l2cap_pi(s)->ident == ident) | |
115 | break; | |
116 | } | |
117 | return s; | |
118 | } | |
119 | ||
120 | static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) | |
121 | { | |
122 | struct sock *s; | |
123 | read_lock(&l->lock); | |
124 | s = __l2cap_get_chan_by_ident(l, ident); | |
af05b30b GP |
125 | if (s) |
126 | bh_lock_sock(s); | |
0139418c MH |
127 | read_unlock(&l->lock); |
128 | return s; | |
129 | } | |
130 | ||
131 | static u16 l2cap_alloc_cid(struct l2cap_chan_list *l) | |
132 | { | |
8db4dc46 | 133 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 134 | |
8db4dc46 | 135 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
af05b30b | 136 | if (!__l2cap_get_chan_by_scid(l, cid)) |
0139418c MH |
137 | return cid; |
138 | } | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk) | |
144 | { | |
145 | sock_hold(sk); | |
146 | ||
147 | if (l->head) | |
148 | l2cap_pi(l->head)->prev_c = sk; | |
149 | ||
150 | l2cap_pi(sk)->next_c = l->head; | |
151 | l2cap_pi(sk)->prev_c = NULL; | |
152 | l->head = sk; | |
153 | } | |
154 | ||
155 | static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk) | |
156 | { | |
157 | struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c; | |
158 | ||
fd1278d7 | 159 | write_lock_bh(&l->lock); |
0139418c MH |
160 | if (sk == l->head) |
161 | l->head = next; | |
162 | ||
163 | if (next) | |
164 | l2cap_pi(next)->prev_c = prev; | |
165 | if (prev) | |
166 | l2cap_pi(prev)->next_c = next; | |
fd1278d7 | 167 | write_unlock_bh(&l->lock); |
0139418c MH |
168 | |
169 | __sock_put(sk); | |
170 | } | |
171 | ||
172 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
173 | { | |
174 | struct l2cap_chan_list *l = &conn->chan_list; | |
175 | ||
af05b30b GP |
176 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
177 | l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid); | |
0139418c | 178 | |
2950f21a MH |
179 | conn->disc_reason = 0x13; |
180 | ||
0139418c MH |
181 | l2cap_pi(sk)->conn = conn; |
182 | ||
bd3c9e25 | 183 | if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) { |
b62f328b VT |
184 | if (conn->hcon->type == LE_LINK) { |
185 | /* LE connection */ | |
186 | l2cap_pi(sk)->omtu = L2CAP_LE_DEFAULT_MTU; | |
187 | l2cap_pi(sk)->scid = L2CAP_CID_LE_DATA; | |
188 | l2cap_pi(sk)->dcid = L2CAP_CID_LE_DATA; | |
189 | } else { | |
190 | /* Alloc CID for connection-oriented socket */ | |
191 | l2cap_pi(sk)->scid = l2cap_alloc_cid(l); | |
192 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; | |
193 | } | |
0139418c MH |
194 | } else if (sk->sk_type == SOCK_DGRAM) { |
195 | /* Connectionless socket */ | |
8db4dc46 GP |
196 | l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS; |
197 | l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS; | |
0139418c MH |
198 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
199 | } else { | |
200 | /* Raw socket can send/recv signalling messages only */ | |
8db4dc46 GP |
201 | l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING; |
202 | l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING; | |
0139418c MH |
203 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
204 | } | |
205 | ||
206 | __l2cap_chan_link(l, sk); | |
207 | ||
208 | if (parent) | |
209 | bt_accept_enqueue(parent, sk); | |
210 | } | |
211 | ||
8e87d142 | 212 | /* Delete channel. |
0139418c | 213 | * Must be called on the locked socket. */ |
6de0702b | 214 | void l2cap_chan_del(struct sock *sk, int err) |
0139418c MH |
215 | { |
216 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
217 | struct sock *parent = bt_sk(sk)->parent; | |
218 | ||
219 | l2cap_sock_clear_timer(sk); | |
220 | ||
221 | BT_DBG("sk %p, conn %p, err %d", sk, conn, err); | |
222 | ||
8e87d142 | 223 | if (conn) { |
0139418c MH |
224 | /* Unlink from channel list */ |
225 | l2cap_chan_unlink(&conn->chan_list, sk); | |
226 | l2cap_pi(sk)->conn = NULL; | |
227 | hci_conn_put(conn->hcon); | |
228 | } | |
229 | ||
b1235d79 | 230 | sk->sk_state = BT_CLOSED; |
0139418c MH |
231 | sock_set_flag(sk, SOCK_ZAPPED); |
232 | ||
233 | if (err) | |
234 | sk->sk_err = err; | |
235 | ||
236 | if (parent) { | |
237 | bt_accept_unlink(sk); | |
238 | parent->sk_data_ready(parent, 0); | |
239 | } else | |
240 | sk->sk_state_change(sk); | |
c13ffa62 GP |
241 | |
242 | skb_queue_purge(TX_QUEUE(sk)); | |
243 | ||
244 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { | |
245 | struct srej_list *l, *tmp; | |
246 | ||
247 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
248 | del_timer(&l2cap_pi(sk)->monitor_timer); | |
249 | del_timer(&l2cap_pi(sk)->ack_timer); | |
250 | ||
251 | skb_queue_purge(SREJ_QUEUE(sk)); | |
252 | skb_queue_purge(BUSY_QUEUE(sk)); | |
253 | ||
254 | list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { | |
255 | list_del(&l->list); | |
256 | kfree(l); | |
257 | } | |
258 | } | |
0139418c MH |
259 | } |
260 | ||
8556edd3 | 261 | static inline u8 l2cap_get_auth_type(struct sock *sk) |
79d554a6 | 262 | { |
8556edd3 JH |
263 | if (sk->sk_type == SOCK_RAW) { |
264 | switch (l2cap_pi(sk)->sec_level) { | |
265 | case BT_SECURITY_HIGH: | |
266 | return HCI_AT_DEDICATED_BONDING_MITM; | |
267 | case BT_SECURITY_MEDIUM: | |
268 | return HCI_AT_DEDICATED_BONDING; | |
269 | default: | |
270 | return HCI_AT_NO_BONDING; | |
271 | } | |
272 | } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { | |
273 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) | |
274 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 275 | |
00ae4af9 | 276 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 277 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 278 | else |
8556edd3 | 279 | return HCI_AT_NO_BONDING; |
00ae4af9 MH |
280 | } else { |
281 | switch (l2cap_pi(sk)->sec_level) { | |
282 | case BT_SECURITY_HIGH: | |
8556edd3 | 283 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 284 | case BT_SECURITY_MEDIUM: |
8556edd3 | 285 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 286 | default: |
8556edd3 | 287 | return HCI_AT_NO_BONDING; |
00ae4af9 | 288 | } |
0684e5f9 | 289 | } |
8556edd3 JH |
290 | } |
291 | ||
292 | /* Service level security */ | |
293 | static inline int l2cap_check_security(struct sock *sk) | |
294 | { | |
295 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
296 | __u8 auth_type; | |
297 | ||
298 | auth_type = l2cap_get_auth_type(sk); | |
79d554a6 | 299 | |
0684e5f9 MH |
300 | return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level, |
301 | auth_type); | |
79d554a6 MH |
302 | } |
303 | ||
68983259 | 304 | u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
305 | { |
306 | u8 id; | |
307 | ||
308 | /* Get next available identificator. | |
309 | * 1 - 128 are used by kernel. | |
310 | * 129 - 199 are reserved. | |
311 | * 200 - 254 are used by utilities like l2ping, etc. | |
312 | */ | |
313 | ||
314 | spin_lock_bh(&conn->lock); | |
315 | ||
316 | if (++conn->tx_ident > 128) | |
317 | conn->tx_ident = 1; | |
318 | ||
319 | id = conn->tx_ident; | |
320 | ||
321 | spin_unlock_bh(&conn->lock); | |
322 | ||
323 | return id; | |
324 | } | |
325 | ||
68983259 | 326 | void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
327 | { |
328 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 329 | u8 flags; |
4e8402a3 MH |
330 | |
331 | BT_DBG("code 0x%2.2x", code); | |
332 | ||
333 | if (!skb) | |
9a9c6a34 | 334 | return; |
4e8402a3 | 335 | |
e702112f AE |
336 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
337 | flags = ACL_START_NO_FLUSH; | |
338 | else | |
339 | flags = ACL_START; | |
340 | ||
341 | hci_send_acl(conn->hcon, skb, flags); | |
4e8402a3 MH |
342 | } |
343 | ||
9a9c6a34 | 344 | static inline void l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control) |
1c2acffb GP |
345 | { |
346 | struct sk_buff *skb; | |
347 | struct l2cap_hdr *lh; | |
348 | struct l2cap_conn *conn = pi->conn; | |
c13ffa62 | 349 | struct sock *sk = (struct sock *)pi; |
fcc203c3 | 350 | int count, hlen = L2CAP_HDR_SIZE + 2; |
e702112f | 351 | u8 flags; |
fcc203c3 | 352 | |
c13ffa62 GP |
353 | if (sk->sk_state != BT_CONNECTED) |
354 | return; | |
355 | ||
fcc203c3 GP |
356 | if (pi->fcs == L2CAP_FCS_CRC16) |
357 | hlen += 2; | |
1c2acffb GP |
358 | |
359 | BT_DBG("pi %p, control 0x%2.2x", pi, control); | |
360 | ||
fcc203c3 | 361 | count = min_t(unsigned int, conn->mtu, hlen); |
1c2acffb GP |
362 | control |= L2CAP_CTRL_FRAME_TYPE; |
363 | ||
9e917af1 GP |
364 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { |
365 | control |= L2CAP_CTRL_FINAL; | |
366 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
367 | } | |
368 | ||
f0946ccf GP |
369 | if (pi->conn_state & L2CAP_CONN_SEND_PBIT) { |
370 | control |= L2CAP_CTRL_POLL; | |
371 | pi->conn_state &= ~L2CAP_CONN_SEND_PBIT; | |
372 | } | |
373 | ||
1c2acffb GP |
374 | skb = bt_skb_alloc(count, GFP_ATOMIC); |
375 | if (!skb) | |
9a9c6a34 | 376 | return; |
1c2acffb GP |
377 | |
378 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fcc203c3 | 379 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
1c2acffb GP |
380 | lh->cid = cpu_to_le16(pi->dcid); |
381 | put_unaligned_le16(control, skb_put(skb, 2)); | |
382 | ||
fcc203c3 GP |
383 | if (pi->fcs == L2CAP_FCS_CRC16) { |
384 | u16 fcs = crc16(0, (u8 *)lh, count - 2); | |
385 | put_unaligned_le16(fcs, skb_put(skb, 2)); | |
386 | } | |
387 | ||
e702112f AE |
388 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
389 | flags = ACL_START_NO_FLUSH; | |
390 | else | |
391 | flags = ACL_START; | |
392 | ||
393 | hci_send_acl(pi->conn->hcon, skb, flags); | |
1c2acffb GP |
394 | } |
395 | ||
9a9c6a34 | 396 | static inline void l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control) |
7e743090 | 397 | { |
1890d36b | 398 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
7e743090 | 399 | control |= L2CAP_SUPER_RCV_NOT_READY; |
1890d36b GP |
400 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
401 | } else | |
7e743090 GP |
402 | control |= L2CAP_SUPER_RCV_READY; |
403 | ||
2ab25cdd GP |
404 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
405 | ||
9a9c6a34 | 406 | l2cap_send_sframe(pi, control); |
7e743090 GP |
407 | } |
408 | ||
e501d055 AE |
409 | static inline int __l2cap_no_conn_pending(struct sock *sk) |
410 | { | |
411 | return !(l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND); | |
412 | } | |
413 | ||
79d554a6 MH |
414 | static void l2cap_do_start(struct sock *sk) |
415 | { | |
416 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
417 | ||
418 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
984947dc MH |
419 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
420 | return; | |
421 | ||
e501d055 | 422 | if (l2cap_check_security(sk) && __l2cap_no_conn_pending(sk)) { |
b1235d79 MH |
423 | struct l2cap_conn_req req; |
424 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
425 | req.psm = l2cap_pi(sk)->psm; | |
79d554a6 | 426 | |
b1235d79 | 427 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
e501d055 | 428 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
79d554a6 | 429 | |
b1235d79 | 430 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
79d554a6 | 431 | L2CAP_CONN_REQ, sizeof(req), &req); |
b1235d79 | 432 | } |
79d554a6 MH |
433 | } else { |
434 | struct l2cap_info_req req; | |
435 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
436 | ||
437 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
438 | conn->info_ident = l2cap_get_ident(conn); | |
439 | ||
440 | mod_timer(&conn->info_timer, jiffies + | |
441 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
442 | ||
443 | l2cap_send_cmd(conn, conn->info_ident, | |
444 | L2CAP_INFO_REQ, sizeof(req), &req); | |
445 | } | |
446 | } | |
447 | ||
cf6c2c0b GP |
448 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
449 | { | |
450 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 451 | if (!disable_ertm) |
cf6c2c0b GP |
452 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
453 | ||
454 | switch (mode) { | |
455 | case L2CAP_MODE_ERTM: | |
456 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
457 | case L2CAP_MODE_STREAMING: | |
458 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
459 | default: | |
460 | return 0x00; | |
461 | } | |
462 | } | |
463 | ||
6de0702b | 464 | void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err) |
22121fc9 GP |
465 | { |
466 | struct l2cap_disconn_req req; | |
467 | ||
c13ffa62 GP |
468 | if (!conn) |
469 | return; | |
470 | ||
471 | skb_queue_purge(TX_QUEUE(sk)); | |
472 | ||
473 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { | |
474 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
475 | del_timer(&l2cap_pi(sk)->monitor_timer); | |
476 | del_timer(&l2cap_pi(sk)->ack_timer); | |
477 | } | |
478 | ||
22121fc9 GP |
479 | req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); |
480 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
481 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
482 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 GP |
483 | |
484 | sk->sk_state = BT_DISCONN; | |
9b108fc0 | 485 | sk->sk_err = err; |
22121fc9 GP |
486 | } |
487 | ||
1da177e4 | 488 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
489 | static void l2cap_conn_start(struct l2cap_conn *conn) |
490 | { | |
491 | struct l2cap_chan_list *l = &conn->chan_list; | |
cf6c2c0b | 492 | struct sock_del_list del, *tmp1, *tmp2; |
4e8402a3 MH |
493 | struct sock *sk; |
494 | ||
495 | BT_DBG("conn %p", conn); | |
496 | ||
cf6c2c0b GP |
497 | INIT_LIST_HEAD(&del.list); |
498 | ||
4e8402a3 MH |
499 | read_lock(&l->lock); |
500 | ||
501 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
502 | bh_lock_sock(sk); | |
503 | ||
bd3c9e25 GP |
504 | if (sk->sk_type != SOCK_SEQPACKET && |
505 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
506 | bh_unlock_sock(sk); |
507 | continue; | |
508 | } | |
509 | ||
510 | if (sk->sk_state == BT_CONNECT) { | |
47731de7 | 511 | struct l2cap_conn_req req; |
79d554a6 | 512 | |
47731de7 GP |
513 | if (!l2cap_check_security(sk) || |
514 | !__l2cap_no_conn_pending(sk)) { | |
515 | bh_unlock_sock(sk); | |
516 | continue; | |
517 | } | |
79d554a6 | 518 | |
47731de7 GP |
519 | if (!l2cap_mode_supported(l2cap_pi(sk)->mode, |
520 | conn->feat_mask) | |
521 | && l2cap_pi(sk)->conf_state & | |
522 | L2CAP_CONF_STATE2_DEVICE) { | |
523 | tmp1 = kzalloc(sizeof(struct sock_del_list), | |
524 | GFP_ATOMIC); | |
525 | tmp1->sk = sk; | |
526 | list_add_tail(&tmp1->list, &del.list); | |
527 | bh_unlock_sock(sk); | |
528 | continue; | |
b1235d79 | 529 | } |
47731de7 GP |
530 | |
531 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
532 | req.psm = l2cap_pi(sk)->psm; | |
533 | ||
534 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); | |
535 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; | |
536 | ||
537 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
538 | L2CAP_CONN_REQ, sizeof(req), &req); | |
539 | ||
79d554a6 MH |
540 | } else if (sk->sk_state == BT_CONNECT2) { |
541 | struct l2cap_conn_rsp rsp; | |
e9aeb2dd | 542 | char buf[128]; |
79d554a6 MH |
543 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
544 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
545 | ||
2af6b9d5 | 546 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
547 | if (bt_sk(sk)->defer_setup) { |
548 | struct sock *parent = bt_sk(sk)->parent; | |
549 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
550 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
551 | parent->sk_data_ready(parent, 0); | |
552 | ||
553 | } else { | |
554 | sk->sk_state = BT_CONFIG; | |
555 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
556 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
557 | } | |
79d554a6 MH |
558 | } else { |
559 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
560 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
561 | } | |
562 | ||
563 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
564 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
e9aeb2dd GP |
565 | |
566 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT || | |
567 | rsp.result != L2CAP_CR_SUCCESS) { | |
568 | bh_unlock_sock(sk); | |
569 | continue; | |
570 | } | |
571 | ||
572 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
573 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
574 | l2cap_build_conf_req(sk, buf), buf); | |
575 | l2cap_pi(sk)->num_conf_req++; | |
4e8402a3 MH |
576 | } |
577 | ||
578 | bh_unlock_sock(sk); | |
579 | } | |
580 | ||
581 | read_unlock(&l->lock); | |
cf6c2c0b GP |
582 | |
583 | list_for_each_entry_safe(tmp1, tmp2, &del.list, list) { | |
584 | bh_lock_sock(tmp1->sk); | |
585 | __l2cap_sock_close(tmp1->sk, ECONNRESET); | |
586 | bh_unlock_sock(tmp1->sk); | |
587 | list_del(&tmp1->list); | |
588 | kfree(tmp1); | |
589 | } | |
4e8402a3 MH |
590 | } |
591 | ||
b62f328b VT |
592 | /* Find socket with cid and source bdaddr. |
593 | * Returns closest match, locked. | |
594 | */ | |
595 | static struct sock *l2cap_get_sock_by_scid(int state, __le16 cid, bdaddr_t *src) | |
596 | { | |
597 | struct sock *s, *sk = NULL, *sk1 = NULL; | |
598 | struct hlist_node *node; | |
599 | ||
600 | read_lock(&l2cap_sk_list.lock); | |
601 | ||
602 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
603 | if (state && sk->sk_state != state) | |
604 | continue; | |
605 | ||
606 | if (l2cap_pi(sk)->scid == cid) { | |
607 | /* Exact match. */ | |
608 | if (!bacmp(&bt_sk(sk)->src, src)) | |
609 | break; | |
610 | ||
611 | /* Closest match */ | |
612 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
613 | sk1 = sk; | |
614 | } | |
615 | } | |
616 | s = node ? sk : sk1; | |
617 | if (s) | |
618 | bh_lock_sock(s); | |
619 | read_unlock(&l2cap_sk_list.lock); | |
620 | ||
621 | return s; | |
622 | } | |
623 | ||
624 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
625 | { | |
626 | struct l2cap_chan_list *list = &conn->chan_list; | |
627 | struct sock *parent, *uninitialized_var(sk); | |
628 | ||
629 | BT_DBG(""); | |
630 | ||
631 | /* Check if we have socket listening on cid */ | |
632 | parent = l2cap_get_sock_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, | |
633 | conn->src); | |
634 | if (!parent) | |
635 | return; | |
636 | ||
637 | /* Check for backlog size */ | |
638 | if (sk_acceptq_is_full(parent)) { | |
639 | BT_DBG("backlog full %d", parent->sk_ack_backlog); | |
640 | goto clean; | |
641 | } | |
642 | ||
643 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); | |
644 | if (!sk) | |
645 | goto clean; | |
646 | ||
647 | write_lock_bh(&list->lock); | |
648 | ||
649 | hci_conn_hold(conn->hcon); | |
650 | ||
651 | l2cap_sock_init(sk, parent); | |
652 | bacpy(&bt_sk(sk)->src, conn->src); | |
653 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
654 | ||
655 | __l2cap_chan_add(conn, sk, parent); | |
656 | ||
657 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
658 | ||
659 | sk->sk_state = BT_CONNECTED; | |
660 | parent->sk_data_ready(parent, 0); | |
661 | ||
662 | write_unlock_bh(&list->lock); | |
663 | ||
664 | clean: | |
665 | bh_unlock_sock(parent); | |
666 | } | |
667 | ||
4e8402a3 MH |
668 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
669 | { | |
79d554a6 MH |
670 | struct l2cap_chan_list *l = &conn->chan_list; |
671 | struct sock *sk; | |
4e8402a3 | 672 | |
79d554a6 | 673 | BT_DBG("conn %p", conn); |
4e8402a3 | 674 | |
b62f328b VT |
675 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
676 | l2cap_le_conn_ready(conn); | |
677 | ||
79d554a6 | 678 | read_lock(&l->lock); |
4e8402a3 | 679 | |
79d554a6 MH |
680 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { |
681 | bh_lock_sock(sk); | |
4e8402a3 | 682 | |
acd7d370 VT |
683 | if (conn->hcon->type == LE_LINK) { |
684 | l2cap_sock_clear_timer(sk); | |
685 | sk->sk_state = BT_CONNECTED; | |
686 | sk->sk_state_change(sk); | |
687 | } | |
688 | ||
bd3c9e25 GP |
689 | if (sk->sk_type != SOCK_SEQPACKET && |
690 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
691 | l2cap_sock_clear_timer(sk); |
692 | sk->sk_state = BT_CONNECTED; | |
693 | sk->sk_state_change(sk); | |
694 | } else if (sk->sk_state == BT_CONNECT) | |
695 | l2cap_do_start(sk); | |
4e8402a3 | 696 | |
79d554a6 | 697 | bh_unlock_sock(sk); |
4e8402a3 | 698 | } |
79d554a6 MH |
699 | |
700 | read_unlock(&l->lock); | |
4e8402a3 MH |
701 | } |
702 | ||
703 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
704 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
705 | { | |
706 | struct l2cap_chan_list *l = &conn->chan_list; | |
707 | struct sock *sk; | |
708 | ||
709 | BT_DBG("conn %p", conn); | |
710 | ||
711 | read_lock(&l->lock); | |
712 | ||
713 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
2af6b9d5 | 714 | if (l2cap_pi(sk)->force_reliable) |
4e8402a3 MH |
715 | sk->sk_err = err; |
716 | } | |
717 | ||
718 | read_unlock(&l->lock); | |
719 | } | |
720 | ||
721 | static void l2cap_info_timeout(unsigned long arg) | |
722 | { | |
723 | struct l2cap_conn *conn = (void *) arg; | |
724 | ||
984947dc | 725 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 726 | conn->info_ident = 0; |
984947dc | 727 | |
4e8402a3 MH |
728 | l2cap_conn_start(conn); |
729 | } | |
730 | ||
1da177e4 LT |
731 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
732 | { | |
0139418c | 733 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 734 | |
0139418c | 735 | if (conn || status) |
1da177e4 LT |
736 | return conn; |
737 | ||
0139418c MH |
738 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
739 | if (!conn) | |
1da177e4 | 740 | return NULL; |
1da177e4 LT |
741 | |
742 | hcon->l2cap_data = conn; | |
743 | conn->hcon = hcon; | |
744 | ||
0139418c MH |
745 | BT_DBG("hcon %p conn %p", hcon, conn); |
746 | ||
acd7d370 VT |
747 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
748 | conn->mtu = hcon->hdev->le_mtu; | |
749 | else | |
750 | conn->mtu = hcon->hdev->acl_mtu; | |
751 | ||
1da177e4 LT |
752 | conn->src = &hcon->hdev->bdaddr; |
753 | conn->dst = &hcon->dst; | |
754 | ||
4e8402a3 MH |
755 | conn->feat_mask = 0; |
756 | ||
1da177e4 LT |
757 | spin_lock_init(&conn->lock); |
758 | rwlock_init(&conn->chan_list.lock); | |
759 | ||
b62f328b VT |
760 | if (hcon->type != LE_LINK) |
761 | setup_timer(&conn->info_timer, l2cap_info_timeout, | |
45054dc1 DY |
762 | (unsigned long) conn); |
763 | ||
2950f21a MH |
764 | conn->disc_reason = 0x13; |
765 | ||
1da177e4 LT |
766 | return conn; |
767 | } | |
768 | ||
0139418c | 769 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1da177e4 | 770 | { |
0139418c | 771 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 LT |
772 | struct sock *sk; |
773 | ||
0139418c MH |
774 | if (!conn) |
775 | return; | |
1da177e4 LT |
776 | |
777 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
778 | ||
7585b97a | 779 | kfree_skb(conn->rx_skb); |
1da177e4 LT |
780 | |
781 | /* Kill channels */ | |
782 | while ((sk = conn->chan_list.head)) { | |
783 | bh_lock_sock(sk); | |
784 | l2cap_chan_del(sk, err); | |
785 | bh_unlock_sock(sk); | |
786 | l2cap_sock_kill(sk); | |
787 | } | |
788 | ||
8e8440f5 DY |
789 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
790 | del_timer_sync(&conn->info_timer); | |
3ab22731 | 791 | |
1da177e4 LT |
792 | hcon->l2cap_data = NULL; |
793 | kfree(conn); | |
1da177e4 LT |
794 | } |
795 | ||
796 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
797 | { | |
798 | struct l2cap_chan_list *l = &conn->chan_list; | |
fd1278d7 | 799 | write_lock_bh(&l->lock); |
1da177e4 | 800 | __l2cap_chan_add(conn, sk, parent); |
fd1278d7 | 801 | write_unlock_bh(&l->lock); |
1da177e4 LT |
802 | } |
803 | ||
1da177e4 | 804 | /* ---- Socket interface ---- */ |
1da177e4 LT |
805 | |
806 | /* Find socket with psm and source bdaddr. | |
807 | * Returns closest match. | |
808 | */ | |
e0f0cb56 | 809 | static struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
810 | { |
811 | struct sock *sk = NULL, *sk1 = NULL; | |
812 | struct hlist_node *node; | |
813 | ||
e0f0cb56 GP |
814 | read_lock(&l2cap_sk_list.lock); |
815 | ||
1da177e4 LT |
816 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
817 | if (state && sk->sk_state != state) | |
818 | continue; | |
819 | ||
820 | if (l2cap_pi(sk)->psm == psm) { | |
821 | /* Exact match. */ | |
822 | if (!bacmp(&bt_sk(sk)->src, src)) | |
823 | break; | |
824 | ||
825 | /* Closest match */ | |
826 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
827 | sk1 = sk; | |
828 | } | |
829 | } | |
1da177e4 | 830 | |
1da177e4 | 831 | read_unlock(&l2cap_sk_list.lock); |
e0f0cb56 GP |
832 | |
833 | return node ? sk : sk1; | |
1da177e4 LT |
834 | } |
835 | ||
4e34c50b | 836 | int l2cap_do_connect(struct sock *sk) |
1da177e4 LT |
837 | { |
838 | bdaddr_t *src = &bt_sk(sk)->src; | |
839 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
840 | struct l2cap_conn *conn; | |
841 | struct hci_conn *hcon; | |
842 | struct hci_dev *hdev; | |
09ab6f4c | 843 | __u8 auth_type; |
44d0e48e | 844 | int err; |
1da177e4 | 845 | |
f29972de MH |
846 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
847 | l2cap_pi(sk)->psm); | |
1da177e4 | 848 | |
af05b30b GP |
849 | hdev = hci_get_route(dst, src); |
850 | if (!hdev) | |
1da177e4 LT |
851 | return -EHOSTUNREACH; |
852 | ||
853 | hci_dev_lock_bh(hdev); | |
854 | ||
8556edd3 | 855 | auth_type = l2cap_get_auth_type(sk); |
09ab6f4c | 856 | |
acd7d370 VT |
857 | if (l2cap_pi(sk)->dcid == L2CAP_CID_LE_DATA) |
858 | hcon = hci_connect(hdev, LE_LINK, dst, | |
2af6b9d5 | 859 | l2cap_pi(sk)->sec_level, auth_type); |
acd7d370 VT |
860 | else |
861 | hcon = hci_connect(hdev, ACL_LINK, dst, | |
862 | l2cap_pi(sk)->sec_level, auth_type); | |
863 | ||
30e76272 VT |
864 | if (IS_ERR(hcon)) { |
865 | err = PTR_ERR(hcon); | |
1da177e4 | 866 | goto done; |
30e76272 | 867 | } |
1da177e4 LT |
868 | |
869 | conn = l2cap_conn_add(hcon, 0); | |
870 | if (!conn) { | |
871 | hci_conn_put(hcon); | |
30e76272 | 872 | err = -ENOMEM; |
1da177e4 LT |
873 | goto done; |
874 | } | |
875 | ||
1da177e4 LT |
876 | /* Update source addr of the socket */ |
877 | bacpy(src, conn->src); | |
878 | ||
879 | l2cap_chan_add(conn, sk, NULL); | |
880 | ||
881 | sk->sk_state = BT_CONNECT; | |
882 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
883 | ||
884 | if (hcon->state == BT_CONNECTED) { | |
bd3c9e25 GP |
885 | if (sk->sk_type != SOCK_SEQPACKET && |
886 | sk->sk_type != SOCK_STREAM) { | |
1da177e4 | 887 | l2cap_sock_clear_timer(sk); |
d00ef24f JH |
888 | if (l2cap_check_security(sk)) |
889 | sk->sk_state = BT_CONNECTED; | |
79d554a6 MH |
890 | } else |
891 | l2cap_do_start(sk); | |
1da177e4 LT |
892 | } |
893 | ||
30e76272 VT |
894 | err = 0; |
895 | ||
1da177e4 LT |
896 | done: |
897 | hci_dev_unlock_bh(hdev); | |
898 | hci_dev_put(hdev); | |
899 | return err; | |
900 | } | |
901 | ||
dcba0dba | 902 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 GP |
903 | { |
904 | DECLARE_WAITQUEUE(wait, current); | |
905 | int err = 0; | |
906 | int timeo = HZ/5; | |
907 | ||
2b0b05dd | 908 | add_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
909 | while ((l2cap_pi(sk)->unacked_frames > 0 && l2cap_pi(sk)->conn)) { |
910 | set_current_state(TASK_INTERRUPTIBLE); | |
911 | ||
912 | if (!timeo) | |
913 | timeo = HZ/5; | |
914 | ||
915 | if (signal_pending(current)) { | |
916 | err = sock_intr_errno(timeo); | |
917 | break; | |
918 | } | |
919 | ||
920 | release_sock(sk); | |
921 | timeo = schedule_timeout(timeo); | |
922 | lock_sock(sk); | |
923 | ||
924 | err = sock_error(sk); | |
925 | if (err) | |
926 | break; | |
927 | } | |
928 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 929 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
930 | return err; |
931 | } | |
932 | ||
e90bac06 GP |
933 | static void l2cap_monitor_timeout(unsigned long arg) |
934 | { | |
935 | struct sock *sk = (void *) arg; | |
e90bac06 | 936 | |
0e98958d GP |
937 | BT_DBG("sk %p", sk); |
938 | ||
e686219a | 939 | bh_lock_sock(sk); |
e90bac06 | 940 | if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) { |
9b108fc0 | 941 | l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk, ECONNABORTED); |
b13f5860 | 942 | bh_unlock_sock(sk); |
e90bac06 GP |
943 | return; |
944 | } | |
945 | ||
946 | l2cap_pi(sk)->retry_count++; | |
947 | __mod_monitor_timer(); | |
948 | ||
a2e12a2a | 949 | l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); |
e686219a | 950 | bh_unlock_sock(sk); |
e90bac06 GP |
951 | } |
952 | ||
953 | static void l2cap_retrans_timeout(unsigned long arg) | |
954 | { | |
955 | struct sock *sk = (void *) arg; | |
e90bac06 | 956 | |
0e98958d GP |
957 | BT_DBG("sk %p", sk); |
958 | ||
e686219a | 959 | bh_lock_sock(sk); |
e90bac06 GP |
960 | l2cap_pi(sk)->retry_count = 1; |
961 | __mod_monitor_timer(); | |
962 | ||
963 | l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; | |
964 | ||
a2e12a2a | 965 | l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); |
e686219a | 966 | bh_unlock_sock(sk); |
e90bac06 GP |
967 | } |
968 | ||
1c2acffb | 969 | static void l2cap_drop_acked_frames(struct sock *sk) |
1da177e4 | 970 | { |
1c2acffb | 971 | struct sk_buff *skb; |
1da177e4 | 972 | |
812e737e GP |
973 | while ((skb = skb_peek(TX_QUEUE(sk))) && |
974 | l2cap_pi(sk)->unacked_frames) { | |
1c2acffb GP |
975 | if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq) |
976 | break; | |
1da177e4 | 977 | |
1c2acffb GP |
978 | skb = skb_dequeue(TX_QUEUE(sk)); |
979 | kfree_skb(skb); | |
1da177e4 | 980 | |
1c2acffb GP |
981 | l2cap_pi(sk)->unacked_frames--; |
982 | } | |
1da177e4 | 983 | |
e90bac06 GP |
984 | if (!l2cap_pi(sk)->unacked_frames) |
985 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
1c2acffb | 986 | } |
1da177e4 | 987 | |
fd83ccdb | 988 | void l2cap_do_send(struct sock *sk, struct sk_buff *skb) |
1c2acffb GP |
989 | { |
990 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
e702112f AE |
991 | struct hci_conn *hcon = pi->conn->hcon; |
992 | u16 flags; | |
1c2acffb GP |
993 | |
994 | BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len); | |
1da177e4 | 995 | |
e702112f AE |
996 | if (!pi->flushable && lmp_no_flush_capable(hcon->hdev)) |
997 | flags = ACL_START_NO_FLUSH; | |
998 | else | |
999 | flags = ACL_START; | |
1000 | ||
1001 | hci_send_acl(hcon, skb, flags); | |
1c2acffb GP |
1002 | } |
1003 | ||
fd83ccdb | 1004 | void l2cap_streaming_send(struct sock *sk) |
6840ed07 | 1005 | { |
ccbb84af | 1006 | struct sk_buff *skb; |
6840ed07 | 1007 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
fcc203c3 | 1008 | u16 control, fcs; |
6840ed07 | 1009 | |
ccbb84af GP |
1010 | while ((skb = skb_dequeue(TX_QUEUE(sk)))) { |
1011 | control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE); | |
6840ed07 | 1012 | control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; |
ccbb84af | 1013 | put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE); |
6840ed07 | 1014 | |
e8235c6b | 1015 | if (pi->fcs == L2CAP_FCS_CRC16) { |
ccbb84af GP |
1016 | fcs = crc16(0, (u8 *)skb->data, skb->len - 2); |
1017 | put_unaligned_le16(fcs, skb->data + skb->len - 2); | |
fcc203c3 GP |
1018 | } |
1019 | ||
ccbb84af | 1020 | l2cap_do_send(sk, skb); |
6840ed07 GP |
1021 | |
1022 | pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; | |
6840ed07 | 1023 | } |
6840ed07 GP |
1024 | } |
1025 | ||
dfc909be | 1026 | static void l2cap_retransmit_one_frame(struct sock *sk, u8 tx_seq) |
8f17154f GP |
1027 | { |
1028 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1029 | struct sk_buff *skb, *tx_skb; | |
1030 | u16 control, fcs; | |
8f17154f GP |
1031 | |
1032 | skb = skb_peek(TX_QUEUE(sk)); | |
f11d676d GP |
1033 | if (!skb) |
1034 | return; | |
8f17154f | 1035 | |
f11d676d GP |
1036 | do { |
1037 | if (bt_cb(skb)->tx_seq == tx_seq) | |
8f17154f | 1038 | break; |
8f17154f | 1039 | |
f11d676d GP |
1040 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) |
1041 | return; | |
8f17154f | 1042 | |
f11d676d | 1043 | } while ((skb = skb_queue_next(TX_QUEUE(sk), skb))); |
8f17154f | 1044 | |
f11d676d GP |
1045 | if (pi->remote_max_tx && |
1046 | bt_cb(skb)->retries == pi->remote_max_tx) { | |
9b108fc0 | 1047 | l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); |
f11d676d GP |
1048 | return; |
1049 | } | |
1050 | ||
1051 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1052 | bt_cb(skb)->retries++; | |
1053 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
3cb123d1 GP |
1054 | |
1055 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { | |
1056 | control |= L2CAP_CTRL_FINAL; | |
1057 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
1058 | } | |
95ffa978 | 1059 | |
f11d676d GP |
1060 | control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1061 | | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); | |
3cb123d1 | 1062 | |
f11d676d GP |
1063 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1064 | ||
1065 | if (pi->fcs == L2CAP_FCS_CRC16) { | |
1066 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); | |
1067 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1068 | } | |
1069 | ||
1070 | l2cap_do_send(sk, tx_skb); | |
8f17154f GP |
1071 | } |
1072 | ||
fd83ccdb | 1073 | int l2cap_ertm_send(struct sock *sk) |
1c2acffb GP |
1074 | { |
1075 | struct sk_buff *skb, *tx_skb; | |
1076 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
fcc203c3 | 1077 | u16 control, fcs; |
9a9c6a34 | 1078 | int nsent = 0; |
1c2acffb | 1079 | |
c13ffa62 GP |
1080 | if (sk->sk_state != BT_CONNECTED) |
1081 | return -ENOTCONN; | |
e90bac06 | 1082 | |
6e2b6722 | 1083 | while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk))) { |
1c2acffb | 1084 | |
e90bac06 GP |
1085 | if (pi->remote_max_tx && |
1086 | bt_cb(skb)->retries == pi->remote_max_tx) { | |
9b108fc0 | 1087 | l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); |
e90bac06 GP |
1088 | break; |
1089 | } | |
1090 | ||
e420aba3 AE |
1091 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1092 | ||
e90bac06 GP |
1093 | bt_cb(skb)->retries++; |
1094 | ||
1c2acffb | 1095 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
95ffa978 GP |
1096 | control &= L2CAP_CTRL_SAR; |
1097 | ||
d5392c8f GP |
1098 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { |
1099 | control |= L2CAP_CTRL_FINAL; | |
1100 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
1101 | } | |
9f121a5a | 1102 | control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1c2acffb GP |
1103 | | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); |
1104 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); | |
1105 | ||
e90bac06 | 1106 | |
e8235c6b | 1107 | if (pi->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1108 | fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); |
1109 | put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); | |
1110 | } | |
1111 | ||
9a9c6a34 GP |
1112 | l2cap_do_send(sk, tx_skb); |
1113 | ||
e90bac06 | 1114 | __mod_retrans_timer(); |
1c2acffb GP |
1115 | |
1116 | bt_cb(skb)->tx_seq = pi->next_tx_seq; | |
1117 | pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; | |
1118 | ||
52cb1c0d SS |
1119 | if (bt_cb(skb)->retries == 1) |
1120 | pi->unacked_frames++; | |
1121 | ||
d5392c8f | 1122 | pi->frames_sent++; |
1c2acffb GP |
1123 | |
1124 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) | |
1125 | sk->sk_send_head = NULL; | |
1126 | else | |
1127 | sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); | |
9e917af1 GP |
1128 | |
1129 | nsent++; | |
1c2acffb GP |
1130 | } |
1131 | ||
9e917af1 GP |
1132 | return nsent; |
1133 | } | |
1134 | ||
dfc909be GP |
1135 | static int l2cap_retransmit_frames(struct sock *sk) |
1136 | { | |
1137 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1138 | int ret; | |
1139 | ||
dfc909be GP |
1140 | if (!skb_queue_empty(TX_QUEUE(sk))) |
1141 | sk->sk_send_head = TX_QUEUE(sk)->next; | |
1142 | ||
1143 | pi->next_tx_seq = pi->expected_ack_seq; | |
1144 | ret = l2cap_ertm_send(sk); | |
dfc909be GP |
1145 | return ret; |
1146 | } | |
1147 | ||
9a9c6a34 | 1148 | static void l2cap_send_ack(struct l2cap_pinfo *pi) |
9e917af1 GP |
1149 | { |
1150 | struct sock *sk = (struct sock *)pi; | |
1151 | u16 control = 0; | |
1152 | ||
1153 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
1154 | ||
1155 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
1156 | control |= L2CAP_SUPER_RCV_NOT_READY; | |
1890d36b | 1157 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
9a9c6a34 GP |
1158 | l2cap_send_sframe(pi, control); |
1159 | return; | |
9e917af1 | 1160 | } |
dfc909be | 1161 | |
e0f66218 | 1162 | if (l2cap_ertm_send(sk) > 0) |
dfc909be GP |
1163 | return; |
1164 | ||
1165 | control |= L2CAP_SUPER_RCV_READY; | |
1166 | l2cap_send_sframe(pi, control); | |
1c2acffb GP |
1167 | } |
1168 | ||
9a9c6a34 | 1169 | static void l2cap_send_srejtail(struct sock *sk) |
99b0d4b7 GP |
1170 | { |
1171 | struct srej_list *tail; | |
1172 | u16 control; | |
1173 | ||
1174 | control = L2CAP_SUPER_SELECT_REJECT; | |
1175 | control |= L2CAP_CTRL_FINAL; | |
1176 | ||
1177 | tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list); | |
1178 | control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
1179 | ||
1180 | l2cap_send_sframe(l2cap_pi(sk), control); | |
99b0d4b7 GP |
1181 | } |
1182 | ||
1c2acffb GP |
1183 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1184 | { | |
1185 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1186 | struct sk_buff **frag; | |
1187 | int err, sent = 0; | |
1da177e4 | 1188 | |
59203a21 | 1189 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1190 | return -EFAULT; |
1da177e4 LT |
1191 | |
1192 | sent += count; | |
1193 | len -= count; | |
1194 | ||
1195 | /* Continuation fragments (no L2CAP header) */ | |
1196 | frag = &skb_shinfo(skb)->frag_list; | |
1197 | while (len) { | |
1198 | count = min_t(unsigned int, conn->mtu, len); | |
1199 | ||
1200 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1201 | if (!*frag) | |
0175d629 | 1202 | return err; |
1c2acffb GP |
1203 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1204 | return -EFAULT; | |
1da177e4 LT |
1205 | |
1206 | sent += count; | |
1207 | len -= count; | |
1208 | ||
1209 | frag = &(*frag)->next; | |
1210 | } | |
1da177e4 LT |
1211 | |
1212 | return sent; | |
1c2acffb | 1213 | } |
1da177e4 | 1214 | |
fd83ccdb | 1215 | struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len) |
1c2acffb GP |
1216 | { |
1217 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1218 | struct sk_buff *skb; | |
1219 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1220 | struct l2cap_hdr *lh; | |
1221 | ||
1222 | BT_DBG("sk %p len %d", sk, (int)len); | |
1223 | ||
1224 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1225 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1226 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1227 | if (!skb) | |
0175d629 | 1228 | return ERR_PTR(err); |
1c2acffb GP |
1229 | |
1230 | /* Create L2CAP header */ | |
1231 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1232 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1233 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1234 | put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2)); | |
1235 | ||
1236 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1237 | if (unlikely(err < 0)) { | |
1238 | kfree_skb(skb); | |
1239 | return ERR_PTR(err); | |
1240 | } | |
1241 | return skb; | |
1242 | } | |
1243 | ||
fd83ccdb | 1244 | struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len) |
1c2acffb GP |
1245 | { |
1246 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1247 | struct sk_buff *skb; | |
1248 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1249 | struct l2cap_hdr *lh; | |
1250 | ||
1251 | BT_DBG("sk %p len %d", sk, (int)len); | |
1252 | ||
1253 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1254 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1255 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1256 | if (!skb) | |
0175d629 | 1257 | return ERR_PTR(err); |
1c2acffb GP |
1258 | |
1259 | /* Create L2CAP header */ | |
1260 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1261 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1262 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1263 | ||
1264 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1265 | if (unlikely(err < 0)) { | |
1266 | kfree_skb(skb); | |
1267 | return ERR_PTR(err); | |
1268 | } | |
1269 | return skb; | |
1270 | } | |
1271 | ||
fd83ccdb | 1272 | struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen) |
1c2acffb GP |
1273 | { |
1274 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1275 | struct sk_buff *skb; | |
1276 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1277 | struct l2cap_hdr *lh; | |
1278 | ||
1279 | BT_DBG("sk %p len %d", sk, (int)len); | |
1280 | ||
0ee0d208 GP |
1281 | if (!conn) |
1282 | return ERR_PTR(-ENOTCONN); | |
1283 | ||
c74e560c GP |
1284 | if (sdulen) |
1285 | hlen += 2; | |
1286 | ||
fcc203c3 GP |
1287 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1288 | hlen += 2; | |
1289 | ||
1c2acffb GP |
1290 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1291 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1292 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1293 | if (!skb) | |
0175d629 | 1294 | return ERR_PTR(err); |
1c2acffb GP |
1295 | |
1296 | /* Create L2CAP header */ | |
1297 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1298 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1299 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1300 | put_unaligned_le16(control, skb_put(skb, 2)); | |
c74e560c GP |
1301 | if (sdulen) |
1302 | put_unaligned_le16(sdulen, skb_put(skb, 2)); | |
1c2acffb GP |
1303 | |
1304 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1305 | if (unlikely(err < 0)) { | |
1306 | kfree_skb(skb); | |
1307 | return ERR_PTR(err); | |
1308 | } | |
e90bac06 | 1309 | |
fcc203c3 GP |
1310 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1311 | put_unaligned_le16(0, skb_put(skb, 2)); | |
1312 | ||
e90bac06 | 1313 | bt_cb(skb)->retries = 0; |
1c2acffb | 1314 | return skb; |
1da177e4 LT |
1315 | } |
1316 | ||
fd83ccdb | 1317 | int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len) |
c74e560c GP |
1318 | { |
1319 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1320 | struct sk_buff *skb; | |
1321 | struct sk_buff_head sar_queue; | |
1322 | u16 control; | |
1323 | size_t size = 0; | |
1324 | ||
ff12fd64 | 1325 | skb_queue_head_init(&sar_queue); |
c74e560c | 1326 | control = L2CAP_SDU_START; |
1c762159 | 1327 | skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len); |
c74e560c GP |
1328 | if (IS_ERR(skb)) |
1329 | return PTR_ERR(skb); | |
1330 | ||
1331 | __skb_queue_tail(&sar_queue, skb); | |
1c762159 GP |
1332 | len -= pi->remote_mps; |
1333 | size += pi->remote_mps; | |
c74e560c GP |
1334 | |
1335 | while (len > 0) { | |
1336 | size_t buflen; | |
1337 | ||
1c762159 | 1338 | if (len > pi->remote_mps) { |
44651b85 | 1339 | control = L2CAP_SDU_CONTINUE; |
1c762159 | 1340 | buflen = pi->remote_mps; |
c74e560c | 1341 | } else { |
44651b85 | 1342 | control = L2CAP_SDU_END; |
c74e560c GP |
1343 | buflen = len; |
1344 | } | |
1345 | ||
6840ed07 | 1346 | skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0); |
c74e560c GP |
1347 | if (IS_ERR(skb)) { |
1348 | skb_queue_purge(&sar_queue); | |
1349 | return PTR_ERR(skb); | |
1350 | } | |
1351 | ||
1352 | __skb_queue_tail(&sar_queue, skb); | |
1353 | len -= buflen; | |
1354 | size += buflen; | |
c74e560c GP |
1355 | } |
1356 | skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk)); | |
1357 | if (sk->sk_send_head == NULL) | |
1358 | sk->sk_send_head = sar_queue.next; | |
1359 | ||
1360 | return size; | |
1361 | } | |
1362 | ||
1da177e4 LT |
1363 | static void l2cap_chan_ready(struct sock *sk) |
1364 | { | |
1365 | struct sock *parent = bt_sk(sk)->parent; | |
1366 | ||
1367 | BT_DBG("sk %p, parent %p", sk, parent); | |
1368 | ||
1369 | l2cap_pi(sk)->conf_state = 0; | |
1370 | l2cap_sock_clear_timer(sk); | |
1371 | ||
1372 | if (!parent) { | |
1373 | /* Outgoing channel. | |
1374 | * Wake up socket sleeping on connect. | |
1375 | */ | |
1376 | sk->sk_state = BT_CONNECTED; | |
1377 | sk->sk_state_change(sk); | |
1378 | } else { | |
1379 | /* Incoming channel. | |
1380 | * Wake up socket sleeping on accept. | |
1381 | */ | |
1382 | parent->sk_data_ready(parent, 0); | |
1383 | } | |
1384 | } | |
1385 | ||
1386 | /* Copy frame to all raw sockets on that connection */ | |
1387 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
1388 | { | |
1389 | struct l2cap_chan_list *l = &conn->chan_list; | |
1390 | struct sk_buff *nskb; | |
af05b30b | 1391 | struct sock *sk; |
1da177e4 LT |
1392 | |
1393 | BT_DBG("conn %p", conn); | |
1394 | ||
1395 | read_lock(&l->lock); | |
1396 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
1397 | if (sk->sk_type != SOCK_RAW) | |
1398 | continue; | |
1399 | ||
1400 | /* Don't send frame to the socket it came from */ | |
1401 | if (skb->sk == sk) | |
1402 | continue; | |
af05b30b GP |
1403 | nskb = skb_clone(skb, GFP_ATOMIC); |
1404 | if (!nskb) | |
1da177e4 LT |
1405 | continue; |
1406 | ||
1407 | if (sock_queue_rcv_skb(sk, nskb)) | |
1408 | kfree_skb(nskb); | |
1409 | } | |
1410 | read_unlock(&l->lock); | |
1411 | } | |
1412 | ||
1413 | /* ---- L2CAP signalling commands ---- */ | |
1414 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
1415 | u8 code, u8 ident, u16 dlen, void *data) | |
1416 | { | |
1417 | struct sk_buff *skb, **frag; | |
1418 | struct l2cap_cmd_hdr *cmd; | |
1419 | struct l2cap_hdr *lh; | |
1420 | int len, count; | |
1421 | ||
af05b30b GP |
1422 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
1423 | conn, code, ident, dlen); | |
1da177e4 LT |
1424 | |
1425 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
1426 | count = min_t(unsigned int, conn->mtu, len); | |
1427 | ||
1428 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
1429 | if (!skb) | |
1430 | return NULL; | |
1431 | ||
1432 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 1433 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
1434 | |
1435 | if (conn->hcon->type == LE_LINK) | |
1436 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); | |
1437 | else | |
1438 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); | |
1da177e4 LT |
1439 | |
1440 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
1441 | cmd->code = code; | |
1442 | cmd->ident = ident; | |
aca3192c | 1443 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
1444 | |
1445 | if (dlen) { | |
1446 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
1447 | memcpy(skb_put(skb, count), data, count); | |
1448 | data += count; | |
1449 | } | |
1450 | ||
1451 | len -= skb->len; | |
1452 | ||
1453 | /* Continuation fragments (no L2CAP header) */ | |
1454 | frag = &skb_shinfo(skb)->frag_list; | |
1455 | while (len) { | |
1456 | count = min_t(unsigned int, conn->mtu, len); | |
1457 | ||
1458 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
1459 | if (!*frag) | |
1460 | goto fail; | |
1461 | ||
1462 | memcpy(skb_put(*frag, count), data, count); | |
1463 | ||
1464 | len -= count; | |
1465 | data += count; | |
1466 | ||
1467 | frag = &(*frag)->next; | |
1468 | } | |
1469 | ||
1470 | return skb; | |
1471 | ||
1472 | fail: | |
1473 | kfree_skb(skb); | |
1474 | return NULL; | |
1475 | } | |
1476 | ||
1477 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
1478 | { | |
1479 | struct l2cap_conf_opt *opt = *ptr; | |
1480 | int len; | |
1481 | ||
1482 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
1483 | *ptr += len; | |
1484 | ||
1485 | *type = opt->type; | |
1486 | *olen = opt->len; | |
1487 | ||
1488 | switch (opt->len) { | |
1489 | case 1: | |
1490 | *val = *((u8 *) opt->val); | |
1491 | break; | |
1492 | ||
1493 | case 2: | |
bfaaeb3e | 1494 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
1495 | break; |
1496 | ||
1497 | case 4: | |
bfaaeb3e | 1498 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
1499 | break; |
1500 | ||
1501 | default: | |
1502 | *val = (unsigned long) opt->val; | |
1503 | break; | |
1504 | } | |
1505 | ||
1506 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
1507 | return len; | |
1508 | } | |
1509 | ||
1da177e4 LT |
1510 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
1511 | { | |
1512 | struct l2cap_conf_opt *opt = *ptr; | |
1513 | ||
1514 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
1515 | ||
1516 | opt->type = type; | |
1517 | opt->len = len; | |
1518 | ||
1519 | switch (len) { | |
1520 | case 1: | |
1521 | *((u8 *) opt->val) = val; | |
1522 | break; | |
1523 | ||
1524 | case 2: | |
4f8b691c | 1525 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
1526 | break; |
1527 | ||
1528 | case 4: | |
4f8b691c | 1529 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
1530 | break; |
1531 | ||
1532 | default: | |
1533 | memcpy(opt->val, (void *) val, len); | |
1534 | break; | |
1535 | } | |
1536 | ||
1537 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
1538 | } | |
1539 | ||
c1b4f43b GP |
1540 | static void l2cap_ack_timeout(unsigned long arg) |
1541 | { | |
1542 | struct sock *sk = (void *) arg; | |
1543 | ||
1544 | bh_lock_sock(sk); | |
1545 | l2cap_send_ack(l2cap_pi(sk)); | |
1546 | bh_unlock_sock(sk); | |
1547 | } | |
1548 | ||
0565c1c2 GP |
1549 | static inline void l2cap_ertm_init(struct sock *sk) |
1550 | { | |
1551 | l2cap_pi(sk)->expected_ack_seq = 0; | |
1552 | l2cap_pi(sk)->unacked_frames = 0; | |
1553 | l2cap_pi(sk)->buffer_seq = 0; | |
803020c6 | 1554 | l2cap_pi(sk)->num_acked = 0; |
d5392c8f | 1555 | l2cap_pi(sk)->frames_sent = 0; |
0565c1c2 GP |
1556 | |
1557 | setup_timer(&l2cap_pi(sk)->retrans_timer, | |
1558 | l2cap_retrans_timeout, (unsigned long) sk); | |
1559 | setup_timer(&l2cap_pi(sk)->monitor_timer, | |
1560 | l2cap_monitor_timeout, (unsigned long) sk); | |
c1b4f43b GP |
1561 | setup_timer(&l2cap_pi(sk)->ack_timer, |
1562 | l2cap_ack_timeout, (unsigned long) sk); | |
0565c1c2 GP |
1563 | |
1564 | __skb_queue_head_init(SREJ_QUEUE(sk)); | |
1890d36b GP |
1565 | __skb_queue_head_init(BUSY_QUEUE(sk)); |
1566 | ||
1567 | INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work); | |
218bb9df GP |
1568 | |
1569 | sk->sk_backlog_rcv = l2cap_ertm_data_rcv; | |
0565c1c2 GP |
1570 | } |
1571 | ||
f2fcfcd6 GP |
1572 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
1573 | { | |
1574 | switch (mode) { | |
1575 | case L2CAP_MODE_STREAMING: | |
1576 | case L2CAP_MODE_ERTM: | |
1577 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
1578 | return mode; | |
1579 | /* fall through */ | |
1580 | default: | |
1581 | return L2CAP_MODE_BASIC; | |
1582 | } | |
1583 | } | |
1584 | ||
68983259 | 1585 | int l2cap_build_conf_req(struct sock *sk, void *data) |
1da177e4 LT |
1586 | { |
1587 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1588 | struct l2cap_conf_req *req = data; | |
bd3c9e25 | 1589 | struct l2cap_conf_rfc rfc = { .mode = pi->mode }; |
1da177e4 LT |
1590 | void *ptr = req->data; |
1591 | ||
1592 | BT_DBG("sk %p", sk); | |
1593 | ||
f2fcfcd6 GP |
1594 | if (pi->num_conf_req || pi->num_conf_rsp) |
1595 | goto done; | |
1596 | ||
1597 | switch (pi->mode) { | |
1598 | case L2CAP_MODE_STREAMING: | |
1599 | case L2CAP_MODE_ERTM: | |
2ba13ed6 | 1600 | if (pi->conf_state & L2CAP_CONF_STATE2_DEVICE) |
85eb53c6 | 1601 | break; |
85eb53c6 | 1602 | |
2ba13ed6 | 1603 | /* fall through */ |
f2fcfcd6 GP |
1604 | default: |
1605 | pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); | |
1606 | break; | |
1607 | } | |
1608 | ||
1609 | done: | |
7990681c GP |
1610 | if (pi->imtu != L2CAP_DEFAULT_MTU) |
1611 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
1612 | ||
65c7c491 MH |
1613 | switch (pi->mode) { |
1614 | case L2CAP_MODE_BASIC: | |
63406504 GP |
1615 | if (!(pi->conn->feat_mask & L2CAP_FEAT_ERTM) && |
1616 | !(pi->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
1617 | break; | |
1618 | ||
62547752 GP |
1619 | rfc.mode = L2CAP_MODE_BASIC; |
1620 | rfc.txwin_size = 0; | |
1621 | rfc.max_transmit = 0; | |
1622 | rfc.retrans_timeout = 0; | |
1623 | rfc.monitor_timeout = 0; | |
1624 | rfc.max_pdu_size = 0; | |
1625 | ||
63406504 GP |
1626 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1627 | (unsigned long) &rfc); | |
65c7c491 MH |
1628 | break; |
1629 | ||
1630 | case L2CAP_MODE_ERTM: | |
1631 | rfc.mode = L2CAP_MODE_ERTM; | |
14b5aa71 | 1632 | rfc.txwin_size = pi->tx_win; |
68d7f0ce | 1633 | rfc.max_transmit = pi->max_tx; |
f2fcfcd6 GP |
1634 | rfc.retrans_timeout = 0; |
1635 | rfc.monitor_timeout = 0; | |
c74e560c | 1636 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 1637 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 1638 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
f2fcfcd6 | 1639 | |
63406504 GP |
1640 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1641 | (unsigned long) &rfc); | |
1642 | ||
fcc203c3 GP |
1643 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
1644 | break; | |
1645 | ||
1646 | if (pi->fcs == L2CAP_FCS_NONE || | |
1647 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
1648 | pi->fcs = L2CAP_FCS_NONE; | |
1649 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
1650 | } | |
f2fcfcd6 GP |
1651 | break; |
1652 | ||
1653 | case L2CAP_MODE_STREAMING: | |
1654 | rfc.mode = L2CAP_MODE_STREAMING; | |
1655 | rfc.txwin_size = 0; | |
1656 | rfc.max_transmit = 0; | |
1657 | rfc.retrans_timeout = 0; | |
1658 | rfc.monitor_timeout = 0; | |
c74e560c | 1659 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 1660 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 1661 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
65c7c491 | 1662 | |
63406504 GP |
1663 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1664 | (unsigned long) &rfc); | |
1665 | ||
fcc203c3 GP |
1666 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
1667 | break; | |
1668 | ||
1669 | if (pi->fcs == L2CAP_FCS_NONE || | |
1670 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
1671 | pi->fcs = L2CAP_FCS_NONE; | |
1672 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
1673 | } | |
65c7c491 MH |
1674 | break; |
1675 | } | |
1da177e4 | 1676 | |
aca3192c YH |
1677 | req->dcid = cpu_to_le16(pi->dcid); |
1678 | req->flags = cpu_to_le16(0); | |
1da177e4 LT |
1679 | |
1680 | return ptr - data; | |
1681 | } | |
1682 | ||
5dee9e7c | 1683 | static int l2cap_parse_conf_req(struct sock *sk, void *data) |
1da177e4 LT |
1684 | { |
1685 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
5dee9e7c MH |
1686 | struct l2cap_conf_rsp *rsp = data; |
1687 | void *ptr = rsp->data; | |
1688 | void *req = pi->conf_req; | |
1689 | int len = pi->conf_len; | |
1690 | int type, hint, olen; | |
1691 | unsigned long val; | |
6464f35f | 1692 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
861d6882 | 1693 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 1694 | u16 result = L2CAP_CONF_SUCCESS; |
1da177e4 | 1695 | |
5dee9e7c | 1696 | BT_DBG("sk %p", sk); |
820ae1b8 | 1697 | |
5dee9e7c MH |
1698 | while (len >= L2CAP_CONF_OPT_SIZE) { |
1699 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 1700 | |
589d2746 | 1701 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 1702 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
1703 | |
1704 | switch (type) { | |
1705 | case L2CAP_CONF_MTU: | |
861d6882 | 1706 | mtu = val; |
5dee9e7c MH |
1707 | break; |
1708 | ||
1709 | case L2CAP_CONF_FLUSH_TO: | |
1710 | pi->flush_to = val; | |
1711 | break; | |
1712 | ||
1713 | case L2CAP_CONF_QOS: | |
1714 | break; | |
1715 | ||
6464f35f MH |
1716 | case L2CAP_CONF_RFC: |
1717 | if (olen == sizeof(rfc)) | |
1718 | memcpy(&rfc, (void *) val, olen); | |
1719 | break; | |
1720 | ||
fcc203c3 GP |
1721 | case L2CAP_CONF_FCS: |
1722 | if (val == L2CAP_FCS_NONE) | |
1723 | pi->conf_state |= L2CAP_CONF_NO_FCS_RECV; | |
1724 | ||
1725 | break; | |
1726 | ||
5dee9e7c MH |
1727 | default: |
1728 | if (hint) | |
1729 | break; | |
1730 | ||
1731 | result = L2CAP_CONF_UNKNOWN; | |
1732 | *((u8 *) ptr++) = type; | |
1733 | break; | |
1734 | } | |
1735 | } | |
1736 | ||
e9aeb2dd | 1737 | if (pi->num_conf_rsp || pi->num_conf_req > 1) |
f2fcfcd6 GP |
1738 | goto done; |
1739 | ||
1740 | switch (pi->mode) { | |
1741 | case L2CAP_MODE_STREAMING: | |
1742 | case L2CAP_MODE_ERTM: | |
85eb53c6 GP |
1743 | if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) { |
1744 | pi->mode = l2cap_select_mode(rfc.mode, | |
1745 | pi->conn->feat_mask); | |
1746 | break; | |
1747 | } | |
1748 | ||
742e519b | 1749 | if (pi->mode != rfc.mode) |
f2fcfcd6 | 1750 | return -ECONNREFUSED; |
742e519b | 1751 | |
f2fcfcd6 | 1752 | break; |
f2fcfcd6 GP |
1753 | } |
1754 | ||
1755 | done: | |
1756 | if (pi->mode != rfc.mode) { | |
1757 | result = L2CAP_CONF_UNACCEPT; | |
1758 | rfc.mode = pi->mode; | |
1759 | ||
1760 | if (pi->num_conf_rsp == 1) | |
1761 | return -ECONNREFUSED; | |
1762 | ||
1763 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1764 | sizeof(rfc), (unsigned long) &rfc); | |
1765 | } | |
1766 | ||
1767 | ||
5dee9e7c MH |
1768 | if (result == L2CAP_CONF_SUCCESS) { |
1769 | /* Configure output options and let the other side know | |
1770 | * which ones we don't like. */ | |
1771 | ||
f2fcfcd6 GP |
1772 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
1773 | result = L2CAP_CONF_UNACCEPT; | |
1774 | else { | |
1775 | pi->omtu = mtu; | |
1776 | pi->conf_state |= L2CAP_CONF_MTU_DONE; | |
1777 | } | |
1778 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); | |
6464f35f | 1779 | |
f2fcfcd6 GP |
1780 | switch (rfc.mode) { |
1781 | case L2CAP_MODE_BASIC: | |
1782 | pi->fcs = L2CAP_FCS_NONE; | |
1783 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
1784 | break; | |
1785 | ||
1786 | case L2CAP_MODE_ERTM: | |
1787 | pi->remote_tx_win = rfc.txwin_size; | |
1788 | pi->remote_max_tx = rfc.max_transmit; | |
86b1b263 MM |
1789 | |
1790 | if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) | |
1791 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); | |
1c762159 GP |
1792 | |
1793 | pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 | 1794 | |
10467e9e GP |
1795 | rfc.retrans_timeout = |
1796 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
1797 | rfc.monitor_timeout = | |
1798 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 GP |
1799 | |
1800 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
1801 | |
1802 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1803 | sizeof(rfc), (unsigned long) &rfc); | |
1804 | ||
f2fcfcd6 GP |
1805 | break; |
1806 | ||
1807 | case L2CAP_MODE_STREAMING: | |
86b1b263 MM |
1808 | if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) |
1809 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); | |
1c762159 GP |
1810 | |
1811 | pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 GP |
1812 | |
1813 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
1814 | |
1815 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1816 | sizeof(rfc), (unsigned long) &rfc); | |
1817 | ||
f2fcfcd6 GP |
1818 | break; |
1819 | ||
1820 | default: | |
5dee9e7c | 1821 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 1822 | |
6464f35f | 1823 | memset(&rfc, 0, sizeof(rfc)); |
f2fcfcd6 GP |
1824 | rfc.mode = pi->mode; |
1825 | } | |
6464f35f | 1826 | |
f2fcfcd6 GP |
1827 | if (result == L2CAP_CONF_SUCCESS) |
1828 | pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; | |
1829 | } | |
5dee9e7c MH |
1830 | rsp->scid = cpu_to_le16(pi->dcid); |
1831 | rsp->result = cpu_to_le16(result); | |
1832 | rsp->flags = cpu_to_le16(0x0000); | |
1833 | ||
1834 | return ptr - data; | |
1da177e4 LT |
1835 | } |
1836 | ||
f2fcfcd6 GP |
1837 | static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result) |
1838 | { | |
1839 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1840 | struct l2cap_conf_req *req = data; | |
1841 | void *ptr = req->data; | |
1842 | int type, olen; | |
1843 | unsigned long val; | |
1844 | struct l2cap_conf_rfc rfc; | |
1845 | ||
1846 | BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data); | |
1847 | ||
1848 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
1849 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
1850 | ||
1851 | switch (type) { | |
1852 | case L2CAP_CONF_MTU: | |
1853 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
1854 | *result = L2CAP_CONF_UNACCEPT; | |
8183b775 | 1855 | pi->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 1856 | } else |
8183b775 AE |
1857 | pi->imtu = val; |
1858 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
f2fcfcd6 GP |
1859 | break; |
1860 | ||
1861 | case L2CAP_CONF_FLUSH_TO: | |
1862 | pi->flush_to = val; | |
1863 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, | |
1864 | 2, pi->flush_to); | |
1865 | break; | |
1866 | ||
1867 | case L2CAP_CONF_RFC: | |
1868 | if (olen == sizeof(rfc)) | |
1869 | memcpy(&rfc, (void *)val, olen); | |
1870 | ||
1871 | if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) && | |
1872 | rfc.mode != pi->mode) | |
1873 | return -ECONNREFUSED; | |
1874 | ||
f2fcfcd6 GP |
1875 | pi->fcs = 0; |
1876 | ||
1877 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1878 | sizeof(rfc), (unsigned long) &rfc); | |
1879 | break; | |
1880 | } | |
1881 | } | |
1882 | ||
6c2ea7a8 GP |
1883 | if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode) |
1884 | return -ECONNREFUSED; | |
1885 | ||
1886 | pi->mode = rfc.mode; | |
1887 | ||
f2fcfcd6 GP |
1888 | if (*result == L2CAP_CONF_SUCCESS) { |
1889 | switch (rfc.mode) { | |
1890 | case L2CAP_MODE_ERTM: | |
10467e9e GP |
1891 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
1892 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
1c762159 | 1893 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
1894 | break; |
1895 | case L2CAP_MODE_STREAMING: | |
1c762159 | 1896 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
1897 | } |
1898 | } | |
1899 | ||
1900 | req->dcid = cpu_to_le16(pi->dcid); | |
1901 | req->flags = cpu_to_le16(0x0000); | |
1902 | ||
1903 | return ptr - data; | |
1904 | } | |
1905 | ||
5dee9e7c | 1906 | static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) |
1da177e4 LT |
1907 | { |
1908 | struct l2cap_conf_rsp *rsp = data; | |
1909 | void *ptr = rsp->data; | |
1da177e4 | 1910 | |
5dee9e7c | 1911 | BT_DBG("sk %p", sk); |
1da177e4 | 1912 | |
aca3192c | 1913 | rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
5dee9e7c | 1914 | rsp->result = cpu_to_le16(result); |
aca3192c | 1915 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
1916 | |
1917 | return ptr - data; | |
1918 | } | |
1919 | ||
7b1c0049 GP |
1920 | static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len) |
1921 | { | |
1922 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1923 | int type, olen; | |
1924 | unsigned long val; | |
1925 | struct l2cap_conf_rfc rfc; | |
1926 | ||
1927 | BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len); | |
1928 | ||
1929 | if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING)) | |
1930 | return; | |
1931 | ||
1932 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
1933 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
1934 | ||
1935 | switch (type) { | |
1936 | case L2CAP_CONF_RFC: | |
1937 | if (olen == sizeof(rfc)) | |
1938 | memcpy(&rfc, (void *)val, olen); | |
1939 | goto done; | |
1940 | } | |
1941 | } | |
1942 | ||
1943 | done: | |
1944 | switch (rfc.mode) { | |
1945 | case L2CAP_MODE_ERTM: | |
10467e9e GP |
1946 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
1947 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
7b1c0049 GP |
1948 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
1949 | break; | |
1950 | case L2CAP_MODE_STREAMING: | |
1951 | pi->mps = le16_to_cpu(rfc.max_pdu_size); | |
1952 | } | |
1953 | } | |
1954 | ||
4e8402a3 MH |
1955 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
1956 | { | |
1957 | struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; | |
1958 | ||
1959 | if (rej->reason != 0x0000) | |
1960 | return 0; | |
1961 | ||
1962 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
1963 | cmd->ident == conn->info_ident) { | |
4e8402a3 | 1964 | del_timer(&conn->info_timer); |
984947dc MH |
1965 | |
1966 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 1967 | conn->info_ident = 0; |
984947dc | 1968 | |
4e8402a3 MH |
1969 | l2cap_conn_start(conn); |
1970 | } | |
1971 | ||
1972 | return 0; | |
1973 | } | |
1974 | ||
1da177e4 LT |
1975 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
1976 | { | |
1977 | struct l2cap_chan_list *list = &conn->chan_list; | |
1978 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; | |
1979 | struct l2cap_conn_rsp rsp; | |
d793fe8c | 1980 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 1981 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
1982 | |
1983 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 1984 | __le16 psm = req->psm; |
1da177e4 LT |
1985 | |
1986 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
1987 | ||
1988 | /* Check if we have socket listening on psm */ | |
1989 | parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); | |
1990 | if (!parent) { | |
1991 | result = L2CAP_CR_BAD_PSM; | |
1992 | goto sendresp; | |
1993 | } | |
1994 | ||
e0f0cb56 GP |
1995 | bh_lock_sock(parent); |
1996 | ||
e7c29cb1 MH |
1997 | /* Check if the ACL is secure enough (if not SDP) */ |
1998 | if (psm != cpu_to_le16(0x0001) && | |
1999 | !hci_conn_check_link_mode(conn->hcon)) { | |
2950f21a | 2000 | conn->disc_reason = 0x05; |
e7c29cb1 MH |
2001 | result = L2CAP_CR_SEC_BLOCK; |
2002 | goto response; | |
2003 | } | |
2004 | ||
1da177e4 LT |
2005 | result = L2CAP_CR_NO_MEM; |
2006 | ||
2007 | /* Check for backlog size */ | |
2008 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2009 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2010 | goto response; |
2011 | } | |
2012 | ||
3b1e0a65 | 2013 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); |
1da177e4 LT |
2014 | if (!sk) |
2015 | goto response; | |
2016 | ||
fd1278d7 | 2017 | write_lock_bh(&list->lock); |
1da177e4 LT |
2018 | |
2019 | /* Check if we already have channel with that dcid */ | |
2020 | if (__l2cap_get_chan_by_dcid(list, scid)) { | |
fd1278d7 | 2021 | write_unlock_bh(&list->lock); |
1da177e4 LT |
2022 | sock_set_flag(sk, SOCK_ZAPPED); |
2023 | l2cap_sock_kill(sk); | |
2024 | goto response; | |
2025 | } | |
2026 | ||
2027 | hci_conn_hold(conn->hcon); | |
2028 | ||
2029 | l2cap_sock_init(sk, parent); | |
2030 | bacpy(&bt_sk(sk)->src, conn->src); | |
2031 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
2032 | l2cap_pi(sk)->psm = psm; | |
2033 | l2cap_pi(sk)->dcid = scid; | |
2034 | ||
2035 | __l2cap_chan_add(conn, sk, parent); | |
2036 | dcid = l2cap_pi(sk)->scid; | |
2037 | ||
2038 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
2039 | ||
1da177e4 LT |
2040 | l2cap_pi(sk)->ident = cmd->ident; |
2041 | ||
984947dc | 2042 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
2af6b9d5 | 2043 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
2044 | if (bt_sk(sk)->defer_setup) { |
2045 | sk->sk_state = BT_CONNECT2; | |
2046 | result = L2CAP_CR_PEND; | |
2047 | status = L2CAP_CS_AUTHOR_PEND; | |
2048 | parent->sk_data_ready(parent, 0); | |
2049 | } else { | |
2050 | sk->sk_state = BT_CONFIG; | |
2051 | result = L2CAP_CR_SUCCESS; | |
2052 | status = L2CAP_CS_NO_INFO; | |
2053 | } | |
79d554a6 MH |
2054 | } else { |
2055 | sk->sk_state = BT_CONNECT2; | |
2056 | result = L2CAP_CR_PEND; | |
2057 | status = L2CAP_CS_AUTHEN_PEND; | |
2058 | } | |
2059 | } else { | |
2060 | sk->sk_state = BT_CONNECT2; | |
2061 | result = L2CAP_CR_PEND; | |
2062 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2063 | } |
2064 | ||
fd1278d7 | 2065 | write_unlock_bh(&list->lock); |
1da177e4 LT |
2066 | |
2067 | response: | |
2068 | bh_unlock_sock(parent); | |
2069 | ||
2070 | sendresp: | |
aca3192c YH |
2071 | rsp.scid = cpu_to_le16(scid); |
2072 | rsp.dcid = cpu_to_le16(dcid); | |
2073 | rsp.result = cpu_to_le16(result); | |
2074 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2075 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2076 | |
2077 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2078 | struct l2cap_info_req info; | |
2079 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2080 | ||
2081 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2082 | conn->info_ident = l2cap_get_ident(conn); | |
2083 | ||
2084 | mod_timer(&conn->info_timer, jiffies + | |
2085 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
2086 | ||
2087 | l2cap_send_cmd(conn, conn->info_ident, | |
2088 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2089 | } | |
2090 | ||
d793fe8c | 2091 | if (sk && !(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) && |
e9aeb2dd GP |
2092 | result == L2CAP_CR_SUCCESS) { |
2093 | u8 buf[128]; | |
2094 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
2095 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
2096 | l2cap_build_conf_req(sk, buf), buf); | |
2097 | l2cap_pi(sk)->num_conf_req++; | |
2098 | } | |
2099 | ||
1da177e4 LT |
2100 | return 0; |
2101 | } | |
2102 | ||
2103 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2104 | { | |
2105 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2106 | u16 scid, dcid, result, status; | |
2107 | struct sock *sk; | |
2108 | u8 req[128]; | |
2109 | ||
2110 | scid = __le16_to_cpu(rsp->scid); | |
2111 | dcid = __le16_to_cpu(rsp->dcid); | |
2112 | result = __le16_to_cpu(rsp->result); | |
2113 | status = __le16_to_cpu(rsp->status); | |
2114 | ||
2115 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2116 | ||
2117 | if (scid) { | |
af05b30b GP |
2118 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2119 | if (!sk) | |
57d3b22b | 2120 | return -EFAULT; |
1da177e4 | 2121 | } else { |
af05b30b GP |
2122 | sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident); |
2123 | if (!sk) | |
57d3b22b | 2124 | return -EFAULT; |
1da177e4 LT |
2125 | } |
2126 | ||
2127 | switch (result) { | |
2128 | case L2CAP_CR_SUCCESS: | |
2129 | sk->sk_state = BT_CONFIG; | |
2130 | l2cap_pi(sk)->ident = 0; | |
2131 | l2cap_pi(sk)->dcid = dcid; | |
6a8d3010 MH |
2132 | l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; |
2133 | ||
e9aeb2dd GP |
2134 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) |
2135 | break; | |
2136 | ||
2137 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
2138 | ||
1da177e4 LT |
2139 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2140 | l2cap_build_conf_req(sk, req), req); | |
f2fcfcd6 | 2141 | l2cap_pi(sk)->num_conf_req++; |
1da177e4 LT |
2142 | break; |
2143 | ||
2144 | case L2CAP_CR_PEND: | |
6a8d3010 | 2145 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 LT |
2146 | break; |
2147 | ||
2148 | default: | |
a49184c2 AE |
2149 | /* don't delete l2cap channel if sk is owned by user */ |
2150 | if (sock_owned_by_user(sk)) { | |
2151 | sk->sk_state = BT_DISCONN; | |
2152 | l2cap_sock_clear_timer(sk); | |
2153 | l2cap_sock_set_timer(sk, HZ / 5); | |
2154 | break; | |
2155 | } | |
2156 | ||
1da177e4 LT |
2157 | l2cap_chan_del(sk, ECONNREFUSED); |
2158 | break; | |
2159 | } | |
2160 | ||
2161 | bh_unlock_sock(sk); | |
2162 | return 0; | |
2163 | } | |
2164 | ||
8c462b60 MM |
2165 | static inline void set_default_fcs(struct l2cap_pinfo *pi) |
2166 | { | |
2167 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
2168 | * sides request it. | |
2169 | */ | |
2170 | if (pi->mode != L2CAP_MODE_ERTM && pi->mode != L2CAP_MODE_STREAMING) | |
2171 | pi->fcs = L2CAP_FCS_NONE; | |
2172 | else if (!(pi->conf_state & L2CAP_CONF_NO_FCS_RECV)) | |
2173 | pi->fcs = L2CAP_FCS_CRC16; | |
2174 | } | |
2175 | ||
88219a0f | 2176 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
2177 | { |
2178 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
2179 | u16 dcid, flags; | |
2180 | u8 rsp[64]; | |
2181 | struct sock *sk; | |
5dee9e7c | 2182 | int len; |
1da177e4 LT |
2183 | |
2184 | dcid = __le16_to_cpu(req->dcid); | |
2185 | flags = __le16_to_cpu(req->flags); | |
2186 | ||
2187 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
2188 | ||
af05b30b GP |
2189 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
2190 | if (!sk) | |
1da177e4 LT |
2191 | return -ENOENT; |
2192 | ||
df6bd743 GP |
2193 | if (sk->sk_state != BT_CONFIG) { |
2194 | struct l2cap_cmd_rej rej; | |
2195 | ||
2196 | rej.reason = cpu_to_le16(0x0002); | |
2197 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, | |
2198 | sizeof(rej), &rej); | |
354f60a9 | 2199 | goto unlock; |
df6bd743 | 2200 | } |
354f60a9 | 2201 | |
5dee9e7c | 2202 | /* Reject if config buffer is too small. */ |
88219a0f | 2203 | len = cmd_len - sizeof(*req); |
5dee9e7c MH |
2204 | if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) { |
2205 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
2206 | l2cap_build_conf_rsp(sk, rsp, | |
2207 | L2CAP_CONF_REJECT, flags), rsp); | |
2208 | goto unlock; | |
2209 | } | |
2210 | ||
2211 | /* Store config. */ | |
2212 | memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len); | |
2213 | l2cap_pi(sk)->conf_len += len; | |
1da177e4 LT |
2214 | |
2215 | if (flags & 0x0001) { | |
2216 | /* Incomplete config. Send empty response. */ | |
2217 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
5dee9e7c MH |
2218 | l2cap_build_conf_rsp(sk, rsp, |
2219 | L2CAP_CONF_SUCCESS, 0x0001), rsp); | |
1da177e4 LT |
2220 | goto unlock; |
2221 | } | |
2222 | ||
2223 | /* Complete config. */ | |
5dee9e7c | 2224 | len = l2cap_parse_conf_req(sk, rsp); |
f2fcfcd6 | 2225 | if (len < 0) { |
9b108fc0 | 2226 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
1da177e4 | 2227 | goto unlock; |
f2fcfcd6 | 2228 | } |
1da177e4 | 2229 | |
5dee9e7c | 2230 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
f2fcfcd6 | 2231 | l2cap_pi(sk)->num_conf_rsp++; |
5dee9e7c | 2232 | |
5dee9e7c MH |
2233 | /* Reset config buffer. */ |
2234 | l2cap_pi(sk)->conf_len = 0; | |
2235 | ||
876d9484 MH |
2236 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) |
2237 | goto unlock; | |
2238 | ||
1da177e4 | 2239 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { |
8c462b60 | 2240 | set_default_fcs(l2cap_pi(sk)); |
fcc203c3 | 2241 | |
1da177e4 | 2242 | sk->sk_state = BT_CONNECTED; |
e90bac06 | 2243 | |
0565c1c2 GP |
2244 | l2cap_pi(sk)->next_tx_seq = 0; |
2245 | l2cap_pi(sk)->expected_tx_seq = 0; | |
1c2acffb | 2246 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 GP |
2247 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
2248 | l2cap_ertm_init(sk); | |
2249 | ||
1da177e4 | 2250 | l2cap_chan_ready(sk); |
876d9484 MH |
2251 | goto unlock; |
2252 | } | |
2253 | ||
2254 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { | |
79d554a6 | 2255 | u8 buf[64]; |
ab3e5715 | 2256 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; |
1da177e4 | 2257 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
79d554a6 | 2258 | l2cap_build_conf_req(sk, buf), buf); |
f2fcfcd6 | 2259 | l2cap_pi(sk)->num_conf_req++; |
1da177e4 LT |
2260 | } |
2261 | ||
2262 | unlock: | |
2263 | bh_unlock_sock(sk); | |
2264 | return 0; | |
2265 | } | |
2266 | ||
2267 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2268 | { | |
2269 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
2270 | u16 scid, flags, result; | |
2271 | struct sock *sk; | |
7b1c0049 | 2272 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
2273 | |
2274 | scid = __le16_to_cpu(rsp->scid); | |
2275 | flags = __le16_to_cpu(rsp->flags); | |
2276 | result = __le16_to_cpu(rsp->result); | |
2277 | ||
af05b30b GP |
2278 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
2279 | scid, flags, result); | |
1da177e4 | 2280 | |
af05b30b GP |
2281 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2282 | if (!sk) | |
1da177e4 LT |
2283 | return 0; |
2284 | ||
2285 | switch (result) { | |
2286 | case L2CAP_CONF_SUCCESS: | |
7b1c0049 | 2287 | l2cap_conf_rfc_get(sk, rsp->data, len); |
1da177e4 LT |
2288 | break; |
2289 | ||
2290 | case L2CAP_CONF_UNACCEPT: | |
f2fcfcd6 | 2291 | if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
2292 | char req[64]; |
2293 | ||
c2c77ec8 | 2294 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
9b108fc0 | 2295 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
c2c77ec8 AE |
2296 | goto done; |
2297 | } | |
2298 | ||
f2fcfcd6 GP |
2299 | /* throw out any old stored conf requests */ |
2300 | result = L2CAP_CONF_SUCCESS; | |
2301 | len = l2cap_parse_conf_rsp(sk, rsp->data, | |
2302 | len, req, &result); | |
2303 | if (len < 0) { | |
9b108fc0 | 2304 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
f2fcfcd6 GP |
2305 | goto done; |
2306 | } | |
2307 | ||
2308 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2309 | L2CAP_CONF_REQ, len, req); | |
2310 | l2cap_pi(sk)->num_conf_req++; | |
2311 | if (result != L2CAP_CONF_SUCCESS) | |
2312 | goto done; | |
2313 | break; | |
1da177e4 LT |
2314 | } |
2315 | ||
8e87d142 | 2316 | default: |
b1235d79 | 2317 | sk->sk_err = ECONNRESET; |
1da177e4 | 2318 | l2cap_sock_set_timer(sk, HZ * 5); |
9b108fc0 | 2319 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
1da177e4 LT |
2320 | goto done; |
2321 | } | |
2322 | ||
2323 | if (flags & 0x01) | |
2324 | goto done; | |
2325 | ||
1da177e4 LT |
2326 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; |
2327 | ||
2328 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { | |
8c462b60 | 2329 | set_default_fcs(l2cap_pi(sk)); |
fcc203c3 | 2330 | |
1da177e4 | 2331 | sk->sk_state = BT_CONNECTED; |
0565c1c2 | 2332 | l2cap_pi(sk)->next_tx_seq = 0; |
1c2acffb | 2333 | l2cap_pi(sk)->expected_tx_seq = 0; |
1c2acffb | 2334 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 GP |
2335 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
2336 | l2cap_ertm_init(sk); | |
2337 | ||
1da177e4 LT |
2338 | l2cap_chan_ready(sk); |
2339 | } | |
2340 | ||
2341 | done: | |
2342 | bh_unlock_sock(sk); | |
2343 | return 0; | |
2344 | } | |
2345 | ||
2346 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2347 | { | |
2348 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
2349 | struct l2cap_disconn_rsp rsp; | |
2350 | u16 dcid, scid; | |
2351 | struct sock *sk; | |
2352 | ||
2353 | scid = __le16_to_cpu(req->scid); | |
2354 | dcid = __le16_to_cpu(req->dcid); | |
2355 | ||
2356 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
2357 | ||
af05b30b GP |
2358 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
2359 | if (!sk) | |
1da177e4 LT |
2360 | return 0; |
2361 | ||
aca3192c YH |
2362 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); |
2363 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1da177e4 LT |
2364 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
2365 | ||
2366 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2367 | ||
a49184c2 AE |
2368 | /* don't delete l2cap channel if sk is owned by user */ |
2369 | if (sock_owned_by_user(sk)) { | |
2370 | sk->sk_state = BT_DISCONN; | |
2371 | l2cap_sock_clear_timer(sk); | |
2372 | l2cap_sock_set_timer(sk, HZ / 5); | |
2373 | bh_unlock_sock(sk); | |
2374 | return 0; | |
2375 | } | |
2376 | ||
1da177e4 LT |
2377 | l2cap_chan_del(sk, ECONNRESET); |
2378 | bh_unlock_sock(sk); | |
2379 | ||
2380 | l2cap_sock_kill(sk); | |
2381 | return 0; | |
2382 | } | |
2383 | ||
2384 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2385 | { | |
2386 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
2387 | u16 dcid, scid; | |
2388 | struct sock *sk; | |
2389 | ||
2390 | scid = __le16_to_cpu(rsp->scid); | |
2391 | dcid = __le16_to_cpu(rsp->dcid); | |
2392 | ||
2393 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
2394 | ||
af05b30b GP |
2395 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2396 | if (!sk) | |
1da177e4 LT |
2397 | return 0; |
2398 | ||
a49184c2 AE |
2399 | /* don't delete l2cap channel if sk is owned by user */ |
2400 | if (sock_owned_by_user(sk)) { | |
2401 | sk->sk_state = BT_DISCONN; | |
2402 | l2cap_sock_clear_timer(sk); | |
2403 | l2cap_sock_set_timer(sk, HZ / 5); | |
2404 | bh_unlock_sock(sk); | |
2405 | return 0; | |
2406 | } | |
2407 | ||
1da177e4 LT |
2408 | l2cap_chan_del(sk, 0); |
2409 | bh_unlock_sock(sk); | |
2410 | ||
2411 | l2cap_sock_kill(sk); | |
2412 | return 0; | |
2413 | } | |
2414 | ||
2415 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2416 | { | |
2417 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
2418 | u16 type; |
2419 | ||
2420 | type = __le16_to_cpu(req->type); | |
2421 | ||
2422 | BT_DBG("type 0x%4.4x", type); | |
2423 | ||
f0709e03 MH |
2424 | if (type == L2CAP_IT_FEAT_MASK) { |
2425 | u8 buf[8]; | |
44dd46de | 2426 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
2427 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
2428 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2429 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 2430 | if (!disable_ertm) |
fcc203c3 GP |
2431 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2432 | | L2CAP_FEAT_FCS; | |
1b7bf4ed | 2433 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
2434 | l2cap_send_cmd(conn, cmd->ident, |
2435 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
2436 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
2437 | u8 buf[12]; | |
2438 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
2439 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2440 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
2441 | memcpy(buf + 4, l2cap_fixed_chan, 8); | |
2442 | l2cap_send_cmd(conn, cmd->ident, | |
2443 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
2444 | } else { |
2445 | struct l2cap_info_rsp rsp; | |
2446 | rsp.type = cpu_to_le16(type); | |
2447 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
2448 | l2cap_send_cmd(conn, cmd->ident, | |
2449 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
2450 | } | |
1da177e4 LT |
2451 | |
2452 | return 0; | |
2453 | } | |
2454 | ||
2455 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2456 | { | |
2457 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
2458 | u16 type, result; | |
2459 | ||
2460 | type = __le16_to_cpu(rsp->type); | |
2461 | result = __le16_to_cpu(rsp->result); | |
2462 | ||
2463 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
2464 | ||
4e8402a3 MH |
2465 | del_timer(&conn->info_timer); |
2466 | ||
adb08ede VT |
2467 | if (result != L2CAP_IR_SUCCESS) { |
2468 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2469 | conn->info_ident = 0; | |
2470 | ||
2471 | l2cap_conn_start(conn); | |
2472 | ||
2473 | return 0; | |
2474 | } | |
2475 | ||
984947dc | 2476 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 2477 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 2478 | |
47ec1dcd | 2479 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
2480 | struct l2cap_info_req req; |
2481 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2482 | ||
2483 | conn->info_ident = l2cap_get_ident(conn); | |
2484 | ||
2485 | l2cap_send_cmd(conn, conn->info_ident, | |
2486 | L2CAP_INFO_REQ, sizeof(req), &req); | |
2487 | } else { | |
2488 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2489 | conn->info_ident = 0; | |
2490 | ||
2491 | l2cap_conn_start(conn); | |
2492 | } | |
2493 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 2494 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 2495 | conn->info_ident = 0; |
984947dc MH |
2496 | |
2497 | l2cap_conn_start(conn); | |
2498 | } | |
4e8402a3 | 2499 | |
1da177e4 LT |
2500 | return 0; |
2501 | } | |
2502 | ||
e2174ca4 | 2503 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
2504 | u16 to_multiplier) |
2505 | { | |
2506 | u16 max_latency; | |
2507 | ||
2508 | if (min > max || min < 6 || max > 3200) | |
2509 | return -EINVAL; | |
2510 | ||
2511 | if (to_multiplier < 10 || to_multiplier > 3200) | |
2512 | return -EINVAL; | |
2513 | ||
2514 | if (max >= to_multiplier * 8) | |
2515 | return -EINVAL; | |
2516 | ||
2517 | max_latency = (to_multiplier * 8 / max) - 1; | |
2518 | if (latency > 499 || latency > max_latency) | |
2519 | return -EINVAL; | |
2520 | ||
2521 | return 0; | |
2522 | } | |
2523 | ||
2524 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
2525 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
2526 | { | |
2527 | struct hci_conn *hcon = conn->hcon; | |
2528 | struct l2cap_conn_param_update_req *req; | |
2529 | struct l2cap_conn_param_update_rsp rsp; | |
2530 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 2531 | int err; |
de73115a CT |
2532 | |
2533 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
2534 | return -EINVAL; | |
2535 | ||
2536 | cmd_len = __le16_to_cpu(cmd->len); | |
2537 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
2538 | return -EPROTO; | |
2539 | ||
2540 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
2541 | min = __le16_to_cpu(req->min); |
2542 | max = __le16_to_cpu(req->max); | |
de73115a CT |
2543 | latency = __le16_to_cpu(req->latency); |
2544 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
2545 | ||
2546 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2547 | min, max, latency, to_multiplier); | |
2548 | ||
2549 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
2550 | |
2551 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
2552 | if (err) | |
de73115a CT |
2553 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
2554 | else | |
2555 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); | |
2556 | ||
2557 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2558 | sizeof(rsp), &rsp); | |
2559 | ||
2ce603eb CT |
2560 | if (!err) |
2561 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
2562 | ||
de73115a CT |
2563 | return 0; |
2564 | } | |
2565 | ||
3300d9a9 CT |
2566 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2567 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
2568 | { | |
2569 | int err = 0; | |
2570 | ||
2571 | switch (cmd->code) { | |
2572 | case L2CAP_COMMAND_REJ: | |
2573 | l2cap_command_rej(conn, cmd, data); | |
2574 | break; | |
2575 | ||
2576 | case L2CAP_CONN_REQ: | |
2577 | err = l2cap_connect_req(conn, cmd, data); | |
2578 | break; | |
2579 | ||
2580 | case L2CAP_CONN_RSP: | |
2581 | err = l2cap_connect_rsp(conn, cmd, data); | |
2582 | break; | |
2583 | ||
2584 | case L2CAP_CONF_REQ: | |
2585 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
2586 | break; | |
2587 | ||
2588 | case L2CAP_CONF_RSP: | |
2589 | err = l2cap_config_rsp(conn, cmd, data); | |
2590 | break; | |
2591 | ||
2592 | case L2CAP_DISCONN_REQ: | |
2593 | err = l2cap_disconnect_req(conn, cmd, data); | |
2594 | break; | |
2595 | ||
2596 | case L2CAP_DISCONN_RSP: | |
2597 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
2598 | break; | |
2599 | ||
2600 | case L2CAP_ECHO_REQ: | |
2601 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
2602 | break; | |
2603 | ||
2604 | case L2CAP_ECHO_RSP: | |
2605 | break; | |
2606 | ||
2607 | case L2CAP_INFO_REQ: | |
2608 | err = l2cap_information_req(conn, cmd, data); | |
2609 | break; | |
2610 | ||
2611 | case L2CAP_INFO_RSP: | |
2612 | err = l2cap_information_rsp(conn, cmd, data); | |
2613 | break; | |
2614 | ||
2615 | default: | |
2616 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
2617 | err = -EINVAL; | |
2618 | break; | |
2619 | } | |
2620 | ||
2621 | return err; | |
2622 | } | |
2623 | ||
2624 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
2625 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
2626 | { | |
2627 | switch (cmd->code) { | |
2628 | case L2CAP_COMMAND_REJ: | |
2629 | return 0; | |
2630 | ||
2631 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 2632 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
2633 | |
2634 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
2635 | return 0; | |
2636 | ||
2637 | default: | |
2638 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
2639 | return -EINVAL; | |
2640 | } | |
2641 | } | |
2642 | ||
2643 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
2644 | struct sk_buff *skb) | |
1da177e4 LT |
2645 | { |
2646 | u8 *data = skb->data; | |
2647 | int len = skb->len; | |
2648 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 2649 | int err; |
1da177e4 LT |
2650 | |
2651 | l2cap_raw_recv(conn, skb); | |
2652 | ||
2653 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 2654 | u16 cmd_len; |
1da177e4 LT |
2655 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
2656 | data += L2CAP_CMD_HDR_SIZE; | |
2657 | len -= L2CAP_CMD_HDR_SIZE; | |
2658 | ||
88219a0f | 2659 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 2660 | |
88219a0f | 2661 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 2662 | |
88219a0f | 2663 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
2664 | BT_DBG("corrupted command"); |
2665 | break; | |
2666 | } | |
2667 | ||
3300d9a9 CT |
2668 | if (conn->hcon->type == LE_LINK) |
2669 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
2670 | else | |
2671 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
2672 | |
2673 | if (err) { | |
2674 | struct l2cap_cmd_rej rej; | |
2675 | BT_DBG("error %d", err); | |
2676 | ||
2677 | /* FIXME: Map err to a valid reason */ | |
aca3192c | 2678 | rej.reason = cpu_to_le16(0); |
1da177e4 LT |
2679 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
2680 | } | |
2681 | ||
88219a0f AV |
2682 | data += cmd_len; |
2683 | len -= cmd_len; | |
1da177e4 LT |
2684 | } |
2685 | ||
2686 | kfree_skb(skb); | |
2687 | } | |
2688 | ||
fcc203c3 GP |
2689 | static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb) |
2690 | { | |
2691 | u16 our_fcs, rcv_fcs; | |
2692 | int hdr_size = L2CAP_HDR_SIZE + 2; | |
2693 | ||
2694 | if (pi->fcs == L2CAP_FCS_CRC16) { | |
2695 | skb_trim(skb, skb->len - 2); | |
2696 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); | |
2697 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
2698 | ||
2699 | if (our_fcs != rcv_fcs) | |
7a560e5c | 2700 | return -EBADMSG; |
fcc203c3 GP |
2701 | } |
2702 | return 0; | |
2703 | } | |
2704 | ||
d5392c8f GP |
2705 | static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk) |
2706 | { | |
2707 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2708 | u16 control = 0; | |
2709 | ||
2710 | pi->frames_sent = 0; | |
d5392c8f GP |
2711 | |
2712 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
2713 | ||
2714 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
64988868 | 2715 | control |= L2CAP_SUPER_RCV_NOT_READY; |
d5392c8f | 2716 | l2cap_send_sframe(pi, control); |
1890d36b | 2717 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
d5392c8f GP |
2718 | } |
2719 | ||
4ea727ef GP |
2720 | if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY) |
2721 | l2cap_retransmit_frames(sk); | |
d5392c8f GP |
2722 | |
2723 | l2cap_ertm_send(sk); | |
2724 | ||
2725 | if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) && | |
2726 | pi->frames_sent == 0) { | |
2727 | control |= L2CAP_SUPER_RCV_READY; | |
d5392c8f GP |
2728 | l2cap_send_sframe(pi, control); |
2729 | } | |
2730 | } | |
2731 | ||
9b53350d | 2732 | static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar) |
8f17154f GP |
2733 | { |
2734 | struct sk_buff *next_skb; | |
bfbacc11 JPRV |
2735 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
2736 | int tx_seq_offset, next_tx_seq_offset; | |
8f17154f GP |
2737 | |
2738 | bt_cb(skb)->tx_seq = tx_seq; | |
2739 | bt_cb(skb)->sar = sar; | |
2740 | ||
2741 | next_skb = skb_peek(SREJ_QUEUE(sk)); | |
2742 | if (!next_skb) { | |
2743 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
9b53350d | 2744 | return 0; |
8f17154f GP |
2745 | } |
2746 | ||
bfbacc11 JPRV |
2747 | tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; |
2748 | if (tx_seq_offset < 0) | |
2749 | tx_seq_offset += 64; | |
2750 | ||
8f17154f | 2751 | do { |
9b53350d JPRV |
2752 | if (bt_cb(next_skb)->tx_seq == tx_seq) |
2753 | return -EINVAL; | |
2754 | ||
bfbacc11 JPRV |
2755 | next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - |
2756 | pi->buffer_seq) % 64; | |
2757 | if (next_tx_seq_offset < 0) | |
2758 | next_tx_seq_offset += 64; | |
2759 | ||
2760 | if (next_tx_seq_offset > tx_seq_offset) { | |
8f17154f | 2761 | __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb); |
9b53350d | 2762 | return 0; |
8f17154f GP |
2763 | } |
2764 | ||
2765 | if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb)) | |
2766 | break; | |
2767 | ||
59203a21 | 2768 | } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb))); |
8f17154f GP |
2769 | |
2770 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
9b53350d JPRV |
2771 | |
2772 | return 0; | |
8f17154f GP |
2773 | } |
2774 | ||
18778a63 GP |
2775 | static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) |
2776 | { | |
2777 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2778 | struct sk_buff *_skb; | |
1890d36b | 2779 | int err; |
18778a63 GP |
2780 | |
2781 | switch (control & L2CAP_CTRL_SAR) { | |
2782 | case L2CAP_SDU_UNSEGMENTED: | |
2783 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) | |
2784 | goto drop; | |
2785 | ||
2786 | err = sock_queue_rcv_skb(sk, skb); | |
2787 | if (!err) | |
2788 | return err; | |
2789 | ||
2790 | break; | |
2791 | ||
2792 | case L2CAP_SDU_START: | |
2793 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) | |
2794 | goto drop; | |
2795 | ||
2796 | pi->sdu_len = get_unaligned_le16(skb->data); | |
18778a63 GP |
2797 | |
2798 | if (pi->sdu_len > pi->imtu) | |
2799 | goto disconnect; | |
2800 | ||
2801 | pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); | |
1890d36b GP |
2802 | if (!pi->sdu) |
2803 | return -ENOMEM; | |
2804 | ||
2805 | /* pull sdu_len bytes only after alloc, because of Local Busy | |
2806 | * condition we have to be sure that this will be executed | |
2807 | * only once, i.e., when alloc does not fail */ | |
2808 | skb_pull(skb, 2); | |
18778a63 GP |
2809 | |
2810 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
2811 | ||
2812 | pi->conn_state |= L2CAP_CONN_SAR_SDU; | |
2813 | pi->partial_sdu_len = skb->len; | |
2814 | break; | |
2815 | ||
2816 | case L2CAP_SDU_CONTINUE: | |
2817 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
2818 | goto disconnect; | |
2819 | ||
2820 | if (!pi->sdu) | |
2821 | goto disconnect; | |
2822 | ||
18778a63 GP |
2823 | pi->partial_sdu_len += skb->len; |
2824 | if (pi->partial_sdu_len > pi->sdu_len) | |
2825 | goto drop; | |
2826 | ||
4178ba46 GP |
2827 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); |
2828 | ||
18778a63 GP |
2829 | break; |
2830 | ||
2831 | case L2CAP_SDU_END: | |
2832 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
2833 | goto disconnect; | |
2834 | ||
2835 | if (!pi->sdu) | |
2836 | goto disconnect; | |
2837 | ||
1890d36b | 2838 | if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) { |
1890d36b | 2839 | pi->partial_sdu_len += skb->len; |
18778a63 | 2840 | |
1890d36b GP |
2841 | if (pi->partial_sdu_len > pi->imtu) |
2842 | goto drop; | |
18778a63 | 2843 | |
1890d36b GP |
2844 | if (pi->partial_sdu_len != pi->sdu_len) |
2845 | goto drop; | |
4178ba46 GP |
2846 | |
2847 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
1890d36b | 2848 | } |
18778a63 GP |
2849 | |
2850 | _skb = skb_clone(pi->sdu, GFP_ATOMIC); | |
1890d36b GP |
2851 | if (!_skb) { |
2852 | pi->conn_state |= L2CAP_CONN_SAR_RETRY; | |
2853 | return -ENOMEM; | |
2854 | } | |
2855 | ||
18778a63 | 2856 | err = sock_queue_rcv_skb(sk, _skb); |
1890d36b | 2857 | if (err < 0) { |
18778a63 | 2858 | kfree_skb(_skb); |
1890d36b GP |
2859 | pi->conn_state |= L2CAP_CONN_SAR_RETRY; |
2860 | return err; | |
2861 | } | |
2862 | ||
2863 | pi->conn_state &= ~L2CAP_CONN_SAR_RETRY; | |
2864 | pi->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
18778a63 GP |
2865 | |
2866 | kfree_skb(pi->sdu); | |
2867 | break; | |
2868 | } | |
2869 | ||
2870 | kfree_skb(skb); | |
1890d36b | 2871 | return 0; |
18778a63 GP |
2872 | |
2873 | drop: | |
2874 | kfree_skb(pi->sdu); | |
2875 | pi->sdu = NULL; | |
2876 | ||
2877 | disconnect: | |
9b108fc0 | 2878 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
18778a63 GP |
2879 | kfree_skb(skb); |
2880 | return 0; | |
2881 | } | |
2882 | ||
712132eb GP |
2883 | static int l2cap_try_push_rx_skb(struct sock *sk) |
2884 | { | |
2885 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2886 | struct sk_buff *skb; | |
2887 | u16 control; | |
2888 | int err; | |
2889 | ||
2890 | while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) { | |
2891 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; | |
2892 | err = l2cap_ertm_reassembly_sdu(sk, skb, control); | |
2893 | if (err < 0) { | |
2894 | skb_queue_head(BUSY_QUEUE(sk), skb); | |
2895 | return -EBUSY; | |
2896 | } | |
2897 | ||
2898 | pi->buffer_seq = (pi->buffer_seq + 1) % 64; | |
2899 | } | |
2900 | ||
2901 | if (!(pi->conn_state & L2CAP_CONN_RNR_SENT)) | |
2902 | goto done; | |
2903 | ||
2904 | control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
2905 | control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; | |
2906 | l2cap_send_sframe(pi, control); | |
2907 | l2cap_pi(sk)->retry_count = 1; | |
2908 | ||
2909 | del_timer(&pi->retrans_timer); | |
2910 | __mod_monitor_timer(); | |
2911 | ||
2912 | l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; | |
2913 | ||
2914 | done: | |
2915 | pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; | |
2916 | pi->conn_state &= ~L2CAP_CONN_RNR_SENT; | |
2917 | ||
2918 | BT_DBG("sk %p, Exit local busy", sk); | |
2919 | ||
2920 | return 0; | |
2921 | } | |
2922 | ||
1890d36b GP |
2923 | static void l2cap_busy_work(struct work_struct *work) |
2924 | { | |
2925 | DECLARE_WAITQUEUE(wait, current); | |
2926 | struct l2cap_pinfo *pi = | |
2927 | container_of(work, struct l2cap_pinfo, busy_work); | |
2928 | struct sock *sk = (struct sock *)pi; | |
2929 | int n_tries = 0, timeo = HZ/5, err; | |
2930 | struct sk_buff *skb; | |
1890d36b GP |
2931 | |
2932 | lock_sock(sk); | |
2933 | ||
2b0b05dd | 2934 | add_wait_queue(sk_sleep(sk), &wait); |
1890d36b GP |
2935 | while ((skb = skb_peek(BUSY_QUEUE(sk)))) { |
2936 | set_current_state(TASK_INTERRUPTIBLE); | |
2937 | ||
2938 | if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { | |
2939 | err = -EBUSY; | |
9b108fc0 | 2940 | l2cap_send_disconn_req(pi->conn, sk, EBUSY); |
712132eb | 2941 | break; |
1890d36b GP |
2942 | } |
2943 | ||
2944 | if (!timeo) | |
2945 | timeo = HZ/5; | |
2946 | ||
2947 | if (signal_pending(current)) { | |
2948 | err = sock_intr_errno(timeo); | |
712132eb | 2949 | break; |
1890d36b GP |
2950 | } |
2951 | ||
2952 | release_sock(sk); | |
2953 | timeo = schedule_timeout(timeo); | |
2954 | lock_sock(sk); | |
2955 | ||
2956 | err = sock_error(sk); | |
2957 | if (err) | |
712132eb | 2958 | break; |
1890d36b | 2959 | |
712132eb | 2960 | if (l2cap_try_push_rx_skb(sk) == 0) |
1890d36b GP |
2961 | break; |
2962 | } | |
2963 | ||
1890d36b | 2964 | set_current_state(TASK_RUNNING); |
2b0b05dd | 2965 | remove_wait_queue(sk_sleep(sk), &wait); |
1890d36b GP |
2966 | |
2967 | release_sock(sk); | |
2968 | } | |
2969 | ||
2970 | static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control) | |
2971 | { | |
2972 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2973 | int sctrl, err; | |
2974 | ||
2975 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
2976 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; | |
2977 | __skb_queue_tail(BUSY_QUEUE(sk), skb); | |
712132eb GP |
2978 | return l2cap_try_push_rx_skb(sk); |
2979 | ||
2980 | ||
1890d36b GP |
2981 | } |
2982 | ||
2983 | err = l2cap_ertm_reassembly_sdu(sk, skb, control); | |
2984 | if (err >= 0) { | |
2985 | pi->buffer_seq = (pi->buffer_seq + 1) % 64; | |
2986 | return err; | |
2987 | } | |
2988 | ||
2989 | /* Busy Condition */ | |
0e98958d GP |
2990 | BT_DBG("sk %p, Enter local busy", sk); |
2991 | ||
1890d36b GP |
2992 | pi->conn_state |= L2CAP_CONN_LOCAL_BUSY; |
2993 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; | |
2994 | __skb_queue_tail(BUSY_QUEUE(sk), skb); | |
2995 | ||
2996 | sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
2997 | sctrl |= L2CAP_SUPER_RCV_NOT_READY; | |
2998 | l2cap_send_sframe(pi, sctrl); | |
2999 | ||
3000 | pi->conn_state |= L2CAP_CONN_RNR_SENT; | |
3001 | ||
7fe9b298 GP |
3002 | del_timer(&pi->ack_timer); |
3003 | ||
1890d36b GP |
3004 | queue_work(_busy_wq, &pi->busy_work); |
3005 | ||
3006 | return err; | |
3007 | } | |
3008 | ||
18778a63 | 3009 | static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) |
c74e560c GP |
3010 | { |
3011 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3012 | struct sk_buff *_skb; | |
3013 | int err = -EINVAL; | |
3014 | ||
18778a63 GP |
3015 | /* |
3016 | * TODO: We have to notify the userland if some data is lost with the | |
3017 | * Streaming Mode. | |
3018 | */ | |
3019 | ||
c74e560c GP |
3020 | switch (control & L2CAP_CTRL_SAR) { |
3021 | case L2CAP_SDU_UNSEGMENTED: | |
3022 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { | |
3023 | kfree_skb(pi->sdu); | |
3024 | break; | |
3025 | } | |
3026 | ||
3027 | err = sock_queue_rcv_skb(sk, skb); | |
3028 | if (!err) | |
3029 | return 0; | |
3030 | ||
3031 | break; | |
3032 | ||
3033 | case L2CAP_SDU_START: | |
3034 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { | |
3035 | kfree_skb(pi->sdu); | |
3036 | break; | |
3037 | } | |
3038 | ||
3039 | pi->sdu_len = get_unaligned_le16(skb->data); | |
3040 | skb_pull(skb, 2); | |
3041 | ||
052897ca GP |
3042 | if (pi->sdu_len > pi->imtu) { |
3043 | err = -EMSGSIZE; | |
3044 | break; | |
3045 | } | |
3046 | ||
c74e560c GP |
3047 | pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); |
3048 | if (!pi->sdu) { | |
3049 | err = -ENOMEM; | |
3050 | break; | |
3051 | } | |
3052 | ||
3053 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3054 | ||
3055 | pi->conn_state |= L2CAP_CONN_SAR_SDU; | |
3056 | pi->partial_sdu_len = skb->len; | |
3057 | err = 0; | |
3058 | break; | |
3059 | ||
3060 | case L2CAP_SDU_CONTINUE: | |
3061 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3062 | break; | |
3063 | ||
3064 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3065 | ||
3066 | pi->partial_sdu_len += skb->len; | |
3067 | if (pi->partial_sdu_len > pi->sdu_len) | |
3068 | kfree_skb(pi->sdu); | |
3069 | else | |
3070 | err = 0; | |
3071 | ||
3072 | break; | |
3073 | ||
3074 | case L2CAP_SDU_END: | |
3075 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3076 | break; | |
3077 | ||
3078 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3079 | ||
3080 | pi->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
3081 | pi->partial_sdu_len += skb->len; | |
3082 | ||
36f2fd58 GP |
3083 | if (pi->partial_sdu_len > pi->imtu) |
3084 | goto drop; | |
3085 | ||
c74e560c GP |
3086 | if (pi->partial_sdu_len == pi->sdu_len) { |
3087 | _skb = skb_clone(pi->sdu, GFP_ATOMIC); | |
3088 | err = sock_queue_rcv_skb(sk, _skb); | |
3089 | if (err < 0) | |
3090 | kfree_skb(_skb); | |
3091 | } | |
c74e560c GP |
3092 | err = 0; |
3093 | ||
36f2fd58 GP |
3094 | drop: |
3095 | kfree_skb(pi->sdu); | |
c74e560c GP |
3096 | break; |
3097 | } | |
3098 | ||
3099 | kfree_skb(skb); | |
3100 | return err; | |
3101 | } | |
3102 | ||
8f17154f GP |
3103 | static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq) |
3104 | { | |
3105 | struct sk_buff *skb; | |
afefdbc4 | 3106 | u16 control; |
8f17154f | 3107 | |
59203a21 | 3108 | while ((skb = skb_peek(SREJ_QUEUE(sk)))) { |
8f17154f GP |
3109 | if (bt_cb(skb)->tx_seq != tx_seq) |
3110 | break; | |
3111 | ||
3112 | skb = skb_dequeue(SREJ_QUEUE(sk)); | |
afefdbc4 | 3113 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
18778a63 | 3114 | l2cap_ertm_reassembly_sdu(sk, skb, control); |
8f17154f GP |
3115 | l2cap_pi(sk)->buffer_seq_srej = |
3116 | (l2cap_pi(sk)->buffer_seq_srej + 1) % 64; | |
8ff50ec0 | 3117 | tx_seq = (tx_seq + 1) % 64; |
8f17154f GP |
3118 | } |
3119 | } | |
3120 | ||
3121 | static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq) | |
3122 | { | |
3123 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3124 | struct srej_list *l, *tmp; | |
3125 | u16 control; | |
3126 | ||
59203a21 | 3127 | list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { |
8f17154f GP |
3128 | if (l->tx_seq == tx_seq) { |
3129 | list_del(&l->list); | |
3130 | kfree(l); | |
3131 | return; | |
3132 | } | |
3133 | control = L2CAP_SUPER_SELECT_REJECT; | |
3134 | control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3135 | l2cap_send_sframe(pi, control); | |
3136 | list_del(&l->list); | |
3137 | list_add_tail(&l->list, SREJ_LIST(sk)); | |
3138 | } | |
3139 | } | |
3140 | ||
3141 | static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq) | |
3142 | { | |
3143 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3144 | struct srej_list *new; | |
3145 | u16 control; | |
3146 | ||
3147 | while (tx_seq != pi->expected_tx_seq) { | |
3148 | control = L2CAP_SUPER_SELECT_REJECT; | |
3149 | control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3150 | l2cap_send_sframe(pi, control); | |
3151 | ||
3152 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
8ff50ec0 GP |
3153 | new->tx_seq = pi->expected_tx_seq; |
3154 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
8f17154f GP |
3155 | list_add_tail(&new->list, SREJ_LIST(sk)); |
3156 | } | |
8ff50ec0 | 3157 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; |
8f17154f GP |
3158 | } |
3159 | ||
1c2acffb GP |
3160 | static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) |
3161 | { | |
3162 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3163 | u8 tx_seq = __get_txseq(rx_control); | |
9f121a5a | 3164 | u8 req_seq = __get_reqseq(rx_control); |
8f17154f | 3165 | u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; |
f6337c77 | 3166 | int tx_seq_offset, expected_tx_seq_offset; |
803020c6 | 3167 | int num_to_ack = (pi->tx_win/6) + 1; |
1c2acffb GP |
3168 | int err = 0; |
3169 | ||
0e98958d GP |
3170 | BT_DBG("sk %p len %d tx_seq %d rx_control 0x%4.4x", sk, skb->len, tx_seq, |
3171 | rx_control); | |
1c2acffb | 3172 | |
9b16dc65 GP |
3173 | if (L2CAP_CTRL_FINAL & rx_control && |
3174 | l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { | |
1d8f5d16 GP |
3175 | del_timer(&pi->monitor_timer); |
3176 | if (pi->unacked_frames > 0) | |
3177 | __mod_retrans_timer(); | |
3178 | pi->conn_state &= ~L2CAP_CONN_WAIT_F; | |
3179 | } | |
3180 | ||
9f121a5a GP |
3181 | pi->expected_ack_seq = req_seq; |
3182 | l2cap_drop_acked_frames(sk); | |
3183 | ||
8f17154f GP |
3184 | if (tx_seq == pi->expected_tx_seq) |
3185 | goto expected; | |
1c2acffb | 3186 | |
9b53350d JPRV |
3187 | tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; |
3188 | if (tx_seq_offset < 0) | |
3189 | tx_seq_offset += 64; | |
3190 | ||
3191 | /* invalid tx_seq */ | |
3192 | if (tx_seq_offset >= pi->tx_win) { | |
9b108fc0 | 3193 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
9b53350d JPRV |
3194 | goto drop; |
3195 | } | |
3196 | ||
1890d36b GP |
3197 | if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY) |
3198 | goto drop; | |
3199 | ||
8f17154f GP |
3200 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
3201 | struct srej_list *first; | |
30afb5b2 | 3202 | |
8f17154f GP |
3203 | first = list_first_entry(SREJ_LIST(sk), |
3204 | struct srej_list, list); | |
3205 | if (tx_seq == first->tx_seq) { | |
3206 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); | |
3207 | l2cap_check_srej_gap(sk, tx_seq); | |
3208 | ||
3209 | list_del(&first->list); | |
3210 | kfree(first); | |
3211 | ||
3212 | if (list_empty(SREJ_LIST(sk))) { | |
3213 | pi->buffer_seq = pi->buffer_seq_srej; | |
3214 | pi->conn_state &= ~L2CAP_CONN_SREJ_SENT; | |
855666cc | 3215 | l2cap_send_ack(pi); |
0e98958d | 3216 | BT_DBG("sk %p, Exit SREJ_SENT", sk); |
8f17154f GP |
3217 | } |
3218 | } else { | |
3219 | struct srej_list *l; | |
9b53350d JPRV |
3220 | |
3221 | /* duplicated tx_seq */ | |
3222 | if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0) | |
3223 | goto drop; | |
8f17154f GP |
3224 | |
3225 | list_for_each_entry(l, SREJ_LIST(sk), list) { | |
3226 | if (l->tx_seq == tx_seq) { | |
3227 | l2cap_resend_srejframe(sk, tx_seq); | |
3228 | return 0; | |
3229 | } | |
3230 | } | |
3231 | l2cap_send_srejframe(sk, tx_seq); | |
30afb5b2 GP |
3232 | } |
3233 | } else { | |
9b53350d JPRV |
3234 | expected_tx_seq_offset = |
3235 | (pi->expected_tx_seq - pi->buffer_seq) % 64; | |
3236 | if (expected_tx_seq_offset < 0) | |
3237 | expected_tx_seq_offset += 64; | |
3238 | ||
3239 | /* duplicated tx_seq */ | |
3240 | if (tx_seq_offset < expected_tx_seq_offset) | |
3241 | goto drop; | |
3242 | ||
8f17154f | 3243 | pi->conn_state |= L2CAP_CONN_SREJ_SENT; |
1c2acffb | 3244 | |
0e98958d GP |
3245 | BT_DBG("sk %p, Enter SREJ", sk); |
3246 | ||
8f17154f GP |
3247 | INIT_LIST_HEAD(SREJ_LIST(sk)); |
3248 | pi->buffer_seq_srej = pi->buffer_seq; | |
3249 | ||
3250 | __skb_queue_head_init(SREJ_QUEUE(sk)); | |
1890d36b | 3251 | __skb_queue_head_init(BUSY_QUEUE(sk)); |
8f17154f GP |
3252 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); |
3253 | ||
ef54fd93 GP |
3254 | pi->conn_state |= L2CAP_CONN_SEND_PBIT; |
3255 | ||
8f17154f | 3256 | l2cap_send_srejframe(sk, tx_seq); |
7fe9b298 GP |
3257 | |
3258 | del_timer(&pi->ack_timer); | |
1c2acffb | 3259 | } |
30afb5b2 GP |
3260 | return 0; |
3261 | ||
8f17154f GP |
3262 | expected: |
3263 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
3264 | ||
3265 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { | |
3b1a9f3f GP |
3266 | bt_cb(skb)->tx_seq = tx_seq; |
3267 | bt_cb(skb)->sar = sar; | |
3268 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
8f17154f GP |
3269 | return 0; |
3270 | } | |
3271 | ||
2ece3684 GP |
3272 | err = l2cap_push_rx_skb(sk, skb, rx_control); |
3273 | if (err < 0) | |
3274 | return 0; | |
3275 | ||
4ec10d97 GP |
3276 | if (rx_control & L2CAP_CTRL_FINAL) { |
3277 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) | |
3278 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
3279 | else |
3280 | l2cap_retransmit_frames(sk); | |
4ec10d97 GP |
3281 | } |
3282 | ||
c1b4f43b GP |
3283 | __mod_ack_timer(); |
3284 | ||
803020c6 GP |
3285 | pi->num_acked = (pi->num_acked + 1) % num_to_ack; |
3286 | if (pi->num_acked == num_to_ack - 1) | |
9e917af1 GP |
3287 | l2cap_send_ack(pi); |
3288 | ||
8f17154f | 3289 | return 0; |
9b53350d JPRV |
3290 | |
3291 | drop: | |
3292 | kfree_skb(skb); | |
3293 | return 0; | |
1c2acffb GP |
3294 | } |
3295 | ||
e072745f | 3296 | static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control) |
1c2acffb GP |
3297 | { |
3298 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
6e3a5981 | 3299 | |
0e98958d GP |
3300 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control), |
3301 | rx_control); | |
3302 | ||
6e3a5981 GP |
3303 | pi->expected_ack_seq = __get_reqseq(rx_control); |
3304 | l2cap_drop_acked_frames(sk); | |
1c2acffb | 3305 | |
e072745f | 3306 | if (rx_control & L2CAP_CTRL_POLL) { |
3cb123d1 | 3307 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; |
05fbd89d GP |
3308 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
3309 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && | |
3310 | (pi->unacked_frames > 0)) | |
3311 | __mod_retrans_timer(); | |
3312 | ||
3313 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
3314 | l2cap_send_srejtail(sk); | |
3315 | } else { | |
3316 | l2cap_send_i_or_rr_or_rnr(sk); | |
05fbd89d | 3317 | } |
1d8f5d16 | 3318 | |
e072745f GP |
3319 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
3320 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
4ec10d97 | 3321 | |
e072745f GP |
3322 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) |
3323 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
3324 | else |
3325 | l2cap_retransmit_frames(sk); | |
2246b2f1 | 3326 | |
e072745f | 3327 | } else { |
e072745f GP |
3328 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && |
3329 | (pi->unacked_frames > 0)) | |
3330 | __mod_retrans_timer(); | |
1c2acffb | 3331 | |
2246b2f1 | 3332 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
894718a6 | 3333 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) |
e072745f | 3334 | l2cap_send_ack(pi); |
894718a6 | 3335 | else |
e072745f GP |
3336 | l2cap_ertm_send(sk); |
3337 | } | |
3338 | } | |
2246b2f1 | 3339 | |
e072745f GP |
3340 | static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control) |
3341 | { | |
3342 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3343 | u8 tx_seq = __get_reqseq(rx_control); | |
30afb5b2 | 3344 | |
0e98958d GP |
3345 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); |
3346 | ||
e072745f GP |
3347 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3348 | ||
8abb52ee | 3349 | pi->expected_ack_seq = tx_seq; |
e072745f GP |
3350 | l2cap_drop_acked_frames(sk); |
3351 | ||
3352 | if (rx_control & L2CAP_CTRL_FINAL) { | |
3353 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) | |
3354 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
3355 | else |
3356 | l2cap_retransmit_frames(sk); | |
e072745f | 3357 | } else { |
dfc909be | 3358 | l2cap_retransmit_frames(sk); |
30afb5b2 | 3359 | |
0301ef04 | 3360 | if (pi->conn_state & L2CAP_CONN_WAIT_F) |
e072745f | 3361 | pi->conn_state |= L2CAP_CONN_REJ_ACT; |
e072745f GP |
3362 | } |
3363 | } | |
3364 | static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control) | |
3365 | { | |
3366 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3367 | u8 tx_seq = __get_reqseq(rx_control); | |
30afb5b2 | 3368 | |
0e98958d GP |
3369 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); |
3370 | ||
e072745f | 3371 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
2246b2f1 | 3372 | |
e072745f GP |
3373 | if (rx_control & L2CAP_CTRL_POLL) { |
3374 | pi->expected_ack_seq = tx_seq; | |
3375 | l2cap_drop_acked_frames(sk); | |
3cb123d1 GP |
3376 | |
3377 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; | |
dfc909be GP |
3378 | l2cap_retransmit_one_frame(sk, tx_seq); |
3379 | ||
e072745f | 3380 | l2cap_ertm_send(sk); |
dfc909be | 3381 | |
e072745f GP |
3382 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { |
3383 | pi->srej_save_reqseq = tx_seq; | |
3384 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; | |
ef54fd93 | 3385 | } |
e072745f GP |
3386 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
3387 | if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) && | |
3388 | pi->srej_save_reqseq == tx_seq) | |
3389 | pi->conn_state &= ~L2CAP_CONN_SREJ_ACT; | |
3390 | else | |
dfc909be | 3391 | l2cap_retransmit_one_frame(sk, tx_seq); |
e072745f | 3392 | } else { |
dfc909be | 3393 | l2cap_retransmit_one_frame(sk, tx_seq); |
e072745f GP |
3394 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { |
3395 | pi->srej_save_reqseq = tx_seq; | |
3396 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; | |
ef54fd93 | 3397 | } |
e072745f GP |
3398 | } |
3399 | } | |
3400 | ||
3401 | static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control) | |
3402 | { | |
3403 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3404 | u8 tx_seq = __get_reqseq(rx_control); | |
3405 | ||
0e98958d GP |
3406 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); |
3407 | ||
e072745f GP |
3408 | pi->conn_state |= L2CAP_CONN_REMOTE_BUSY; |
3409 | pi->expected_ack_seq = tx_seq; | |
3410 | l2cap_drop_acked_frames(sk); | |
3411 | ||
3cb123d1 GP |
3412 | if (rx_control & L2CAP_CTRL_POLL) |
3413 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; | |
3414 | ||
99b0d4b7 GP |
3415 | if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) { |
3416 | del_timer(&pi->retrans_timer); | |
a2e12a2a GP |
3417 | if (rx_control & L2CAP_CTRL_POLL) |
3418 | l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL); | |
99b0d4b7 | 3419 | return; |
e072745f | 3420 | } |
99b0d4b7 GP |
3421 | |
3422 | if (rx_control & L2CAP_CTRL_POLL) | |
3423 | l2cap_send_srejtail(sk); | |
3424 | else | |
3425 | l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY); | |
e072745f GP |
3426 | } |
3427 | ||
3428 | static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) | |
3429 | { | |
3430 | BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len); | |
3431 | ||
9b16dc65 GP |
3432 | if (L2CAP_CTRL_FINAL & rx_control && |
3433 | l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { | |
e072745f GP |
3434 | del_timer(&l2cap_pi(sk)->monitor_timer); |
3435 | if (l2cap_pi(sk)->unacked_frames > 0) | |
3436 | __mod_retrans_timer(); | |
3437 | l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F; | |
3438 | } | |
3439 | ||
3440 | switch (rx_control & L2CAP_CTRL_SUPERVISE) { | |
3441 | case L2CAP_SUPER_RCV_READY: | |
3442 | l2cap_data_channel_rrframe(sk, rx_control); | |
8f17154f GP |
3443 | break; |
3444 | ||
e072745f GP |
3445 | case L2CAP_SUPER_REJECT: |
3446 | l2cap_data_channel_rejframe(sk, rx_control); | |
3447 | break; | |
2246b2f1 | 3448 | |
e072745f GP |
3449 | case L2CAP_SUPER_SELECT_REJECT: |
3450 | l2cap_data_channel_srejframe(sk, rx_control); | |
3451 | break; | |
3452 | ||
3453 | case L2CAP_SUPER_RCV_NOT_READY: | |
3454 | l2cap_data_channel_rnrframe(sk, rx_control); | |
1c2acffb GP |
3455 | break; |
3456 | } | |
3457 | ||
faaebd19 | 3458 | kfree_skb(skb); |
1c2acffb GP |
3459 | return 0; |
3460 | } | |
3461 | ||
218bb9df GP |
3462 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) |
3463 | { | |
3464 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3465 | u16 control; | |
3466 | u8 req_seq; | |
3467 | int len, next_tx_seq_offset, req_seq_offset; | |
3468 | ||
3469 | control = get_unaligned_le16(skb->data); | |
3470 | skb_pull(skb, 2); | |
3471 | len = skb->len; | |
3472 | ||
3473 | /* | |
3474 | * We can just drop the corrupted I-frame here. | |
3475 | * Receiver will miss it and start proper recovery | |
3476 | * procedures and ask retransmission. | |
3477 | */ | |
3478 | if (l2cap_check_fcs(pi, skb)) | |
3479 | goto drop; | |
3480 | ||
3481 | if (__is_sar_start(control) && __is_iframe(control)) | |
3482 | len -= 2; | |
3483 | ||
3484 | if (pi->fcs == L2CAP_FCS_CRC16) | |
3485 | len -= 2; | |
3486 | ||
3487 | if (len > pi->mps) { | |
3488 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); | |
3489 | goto drop; | |
3490 | } | |
3491 | ||
3492 | req_seq = __get_reqseq(control); | |
3493 | req_seq_offset = (req_seq - pi->expected_ack_seq) % 64; | |
3494 | if (req_seq_offset < 0) | |
3495 | req_seq_offset += 64; | |
3496 | ||
3497 | next_tx_seq_offset = | |
3498 | (pi->next_tx_seq - pi->expected_ack_seq) % 64; | |
3499 | if (next_tx_seq_offset < 0) | |
3500 | next_tx_seq_offset += 64; | |
3501 | ||
3502 | /* check for invalid req-seq */ | |
3503 | if (req_seq_offset > next_tx_seq_offset) { | |
3504 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); | |
3505 | goto drop; | |
3506 | } | |
3507 | ||
3508 | if (__is_iframe(control)) { | |
3509 | if (len < 0) { | |
3510 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); | |
3511 | goto drop; | |
3512 | } | |
3513 | ||
3514 | l2cap_data_channel_iframe(sk, control, skb); | |
3515 | } else { | |
3516 | if (len != 0) { | |
3517 | BT_ERR("%d", len); | |
3518 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); | |
3519 | goto drop; | |
3520 | } | |
3521 | ||
3522 | l2cap_data_channel_sframe(sk, control, skb); | |
3523 | } | |
3524 | ||
3525 | return 0; | |
3526 | ||
3527 | drop: | |
3528 | kfree_skb(skb); | |
3529 | return 0; | |
3530 | } | |
3531 | ||
1da177e4 LT |
3532 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
3533 | { | |
3534 | struct sock *sk; | |
6840ed07 | 3535 | struct l2cap_pinfo *pi; |
51893f88 | 3536 | u16 control; |
218bb9df GP |
3537 | u8 tx_seq; |
3538 | int len; | |
1da177e4 LT |
3539 | |
3540 | sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); | |
3541 | if (!sk) { | |
3542 | BT_DBG("unknown cid 0x%4.4x", cid); | |
3543 | goto drop; | |
3544 | } | |
3545 | ||
6840ed07 GP |
3546 | pi = l2cap_pi(sk); |
3547 | ||
1da177e4 LT |
3548 | BT_DBG("sk %p, len %d", sk, skb->len); |
3549 | ||
3550 | if (sk->sk_state != BT_CONNECTED) | |
3551 | goto drop; | |
3552 | ||
6840ed07 | 3553 | switch (pi->mode) { |
1c2acffb GP |
3554 | case L2CAP_MODE_BASIC: |
3555 | /* If socket recv buffers overflows we drop data here | |
3556 | * which is *bad* because L2CAP has to be reliable. | |
3557 | * But we don't have any other choice. L2CAP doesn't | |
3558 | * provide flow control mechanism. */ | |
1da177e4 | 3559 | |
6840ed07 | 3560 | if (pi->imtu < skb->len) |
1c2acffb | 3561 | goto drop; |
1da177e4 | 3562 | |
1c2acffb GP |
3563 | if (!sock_queue_rcv_skb(sk, skb)) |
3564 | goto done; | |
3565 | break; | |
3566 | ||
3567 | case L2CAP_MODE_ERTM: | |
218bb9df GP |
3568 | if (!sock_owned_by_user(sk)) { |
3569 | l2cap_ertm_data_rcv(sk, skb); | |
277ffbe3 | 3570 | } else { |
218bb9df | 3571 | if (sk_add_backlog(sk, skb)) |
277ffbe3 | 3572 | goto drop; |
277ffbe3 | 3573 | } |
1c2acffb | 3574 | |
fcafde2e | 3575 | goto done; |
1c2acffb | 3576 | |
6840ed07 GP |
3577 | case L2CAP_MODE_STREAMING: |
3578 | control = get_unaligned_le16(skb->data); | |
3579 | skb_pull(skb, 2); | |
3580 | len = skb->len; | |
3581 | ||
26000089 GP |
3582 | if (l2cap_check_fcs(pi, skb)) |
3583 | goto drop; | |
3584 | ||
6840ed07 GP |
3585 | if (__is_sar_start(control)) |
3586 | len -= 2; | |
3587 | ||
fcc203c3 GP |
3588 | if (pi->fcs == L2CAP_FCS_CRC16) |
3589 | len -= 2; | |
3590 | ||
51893f88 | 3591 | if (len > pi->mps || len < 0 || __is_sframe(control)) |
6840ed07 GP |
3592 | goto drop; |
3593 | ||
3594 | tx_seq = __get_txseq(control); | |
3595 | ||
3596 | if (pi->expected_tx_seq == tx_seq) | |
3597 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
3598 | else | |
7dffe421 | 3599 | pi->expected_tx_seq = (tx_seq + 1) % 64; |
6840ed07 | 3600 | |
18778a63 | 3601 | l2cap_streaming_reassembly_sdu(sk, skb, control); |
6840ed07 GP |
3602 | |
3603 | goto done; | |
3604 | ||
1c2acffb | 3605 | default: |
e8235c6b | 3606 | BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode); |
1c2acffb GP |
3607 | break; |
3608 | } | |
1da177e4 LT |
3609 | |
3610 | drop: | |
3611 | kfree_skb(skb); | |
3612 | ||
3613 | done: | |
0139418c MH |
3614 | if (sk) |
3615 | bh_unlock_sock(sk); | |
3616 | ||
1da177e4 LT |
3617 | return 0; |
3618 | } | |
3619 | ||
8e036fc3 | 3620 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 LT |
3621 | { |
3622 | struct sock *sk; | |
3623 | ||
3624 | sk = l2cap_get_sock_by_psm(0, psm, conn->src); | |
3625 | if (!sk) | |
3626 | goto drop; | |
3627 | ||
e0f0cb56 GP |
3628 | bh_lock_sock(sk); |
3629 | ||
1da177e4 LT |
3630 | BT_DBG("sk %p, len %d", sk, skb->len); |
3631 | ||
3632 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) | |
3633 | goto drop; | |
3634 | ||
3635 | if (l2cap_pi(sk)->imtu < skb->len) | |
3636 | goto drop; | |
3637 | ||
3638 | if (!sock_queue_rcv_skb(sk, skb)) | |
3639 | goto done; | |
3640 | ||
3641 | drop: | |
3642 | kfree_skb(skb); | |
3643 | ||
3644 | done: | |
af05b30b GP |
3645 | if (sk) |
3646 | bh_unlock_sock(sk); | |
1da177e4 LT |
3647 | return 0; |
3648 | } | |
3649 | ||
3650 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) | |
3651 | { | |
3652 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
3653 | u16 cid, len; |
3654 | __le16 psm; | |
1da177e4 LT |
3655 | |
3656 | skb_pull(skb, L2CAP_HDR_SIZE); | |
3657 | cid = __le16_to_cpu(lh->cid); | |
3658 | len = __le16_to_cpu(lh->len); | |
3659 | ||
1c2acffb GP |
3660 | if (len != skb->len) { |
3661 | kfree_skb(skb); | |
3662 | return; | |
3663 | } | |
3664 | ||
1da177e4 LT |
3665 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
3666 | ||
3667 | switch (cid) { | |
3300d9a9 | 3668 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 3669 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
3670 | l2cap_sig_channel(conn, skb); |
3671 | break; | |
3672 | ||
8db4dc46 | 3673 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 3674 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
3675 | skb_pull(skb, 2); |
3676 | l2cap_conless_channel(conn, psm, skb); | |
3677 | break; | |
3678 | ||
3679 | default: | |
3680 | l2cap_data_channel(conn, cid, skb); | |
3681 | break; | |
3682 | } | |
3683 | } | |
3684 | ||
3685 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
3686 | ||
3687 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
3688 | { | |
3689 | int exact = 0, lm1 = 0, lm2 = 0; | |
3690 | register struct sock *sk; | |
3691 | struct hlist_node *node; | |
3692 | ||
3693 | if (type != ACL_LINK) | |
963cf687 | 3694 | return -EINVAL; |
1da177e4 LT |
3695 | |
3696 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
3697 | ||
3698 | /* Find listening sockets and check their link_mode */ | |
3699 | read_lock(&l2cap_sk_list.lock); | |
3700 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
3701 | if (sk->sk_state != BT_LISTEN) | |
3702 | continue; | |
3703 | ||
3704 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 MH |
3705 | lm1 |= HCI_LM_ACCEPT; |
3706 | if (l2cap_pi(sk)->role_switch) | |
3707 | lm1 |= HCI_LM_MASTER; | |
1da177e4 | 3708 | exact++; |
2af6b9d5 MH |
3709 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
3710 | lm2 |= HCI_LM_ACCEPT; | |
3711 | if (l2cap_pi(sk)->role_switch) | |
3712 | lm2 |= HCI_LM_MASTER; | |
3713 | } | |
1da177e4 LT |
3714 | } |
3715 | read_unlock(&l2cap_sk_list.lock); | |
3716 | ||
3717 | return exact ? lm1 : lm2; | |
3718 | } | |
3719 | ||
3720 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
3721 | { | |
0139418c MH |
3722 | struct l2cap_conn *conn; |
3723 | ||
1da177e4 LT |
3724 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
3725 | ||
acd7d370 | 3726 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 3727 | return -EINVAL; |
1da177e4 LT |
3728 | |
3729 | if (!status) { | |
1da177e4 LT |
3730 | conn = l2cap_conn_add(hcon, status); |
3731 | if (conn) | |
3732 | l2cap_conn_ready(conn); | |
0139418c | 3733 | } else |
1da177e4 LT |
3734 | l2cap_conn_del(hcon, bt_err(status)); |
3735 | ||
3736 | return 0; | |
3737 | } | |
3738 | ||
2950f21a MH |
3739 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
3740 | { | |
3741 | struct l2cap_conn *conn = hcon->l2cap_data; | |
3742 | ||
3743 | BT_DBG("hcon %p", hcon); | |
3744 | ||
3745 | if (hcon->type != ACL_LINK || !conn) | |
3746 | return 0x13; | |
3747 | ||
3748 | return conn->disc_reason; | |
3749 | } | |
3750 | ||
3751 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
3752 | { |
3753 | BT_DBG("hcon %p reason %d", hcon, reason); | |
3754 | ||
acd7d370 | 3755 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 3756 | return -EINVAL; |
1da177e4 LT |
3757 | |
3758 | l2cap_conn_del(hcon, bt_err(reason)); | |
0139418c | 3759 | |
1da177e4 LT |
3760 | return 0; |
3761 | } | |
3762 | ||
f62e4323 MH |
3763 | static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) |
3764 | { | |
bd3c9e25 | 3765 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) |
255c7601 MH |
3766 | return; |
3767 | ||
f62e4323 MH |
3768 | if (encrypt == 0x00) { |
3769 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { | |
3770 | l2cap_sock_clear_timer(sk); | |
3771 | l2cap_sock_set_timer(sk, HZ * 5); | |
3772 | } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) | |
3773 | __l2cap_sock_close(sk, ECONNREFUSED); | |
3774 | } else { | |
3775 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) | |
3776 | l2cap_sock_clear_timer(sk); | |
3777 | } | |
3778 | } | |
3779 | ||
8c1b2355 | 3780 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 LT |
3781 | { |
3782 | struct l2cap_chan_list *l; | |
0139418c | 3783 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 3784 | struct sock *sk; |
1da177e4 | 3785 | |
0139418c | 3786 | if (!conn) |
1da177e4 | 3787 | return 0; |
0139418c | 3788 | |
1da177e4 LT |
3789 | l = &conn->chan_list; |
3790 | ||
3791 | BT_DBG("conn %p", conn); | |
3792 | ||
3793 | read_lock(&l->lock); | |
3794 | ||
3795 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
3796 | bh_lock_sock(sk); | |
3797 | ||
6a8d3010 MH |
3798 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) { |
3799 | bh_unlock_sock(sk); | |
3800 | continue; | |
3801 | } | |
3802 | ||
f62e4323 | 3803 | if (!status && (sk->sk_state == BT_CONNECTED || |
8c1b2355 | 3804 | sk->sk_state == BT_CONFIG)) { |
f62e4323 | 3805 | l2cap_check_encryption(sk, encrypt); |
9719f8af MH |
3806 | bh_unlock_sock(sk); |
3807 | continue; | |
3808 | } | |
3809 | ||
b1235d79 MH |
3810 | if (sk->sk_state == BT_CONNECT) { |
3811 | if (!status) { | |
3812 | struct l2cap_conn_req req; | |
3813 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
3814 | req.psm = l2cap_pi(sk)->psm; | |
1da177e4 | 3815 | |
b1235d79 | 3816 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
e501d055 | 3817 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 | 3818 | |
b1235d79 MH |
3819 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
3820 | L2CAP_CONN_REQ, sizeof(req), &req); | |
3821 | } else { | |
3822 | l2cap_sock_clear_timer(sk); | |
3823 | l2cap_sock_set_timer(sk, HZ / 10); | |
3824 | } | |
3825 | } else if (sk->sk_state == BT_CONNECT2) { | |
3826 | struct l2cap_conn_rsp rsp; | |
3827 | __u16 result; | |
1da177e4 | 3828 | |
b1235d79 MH |
3829 | if (!status) { |
3830 | sk->sk_state = BT_CONFIG; | |
3831 | result = L2CAP_CR_SUCCESS; | |
3832 | } else { | |
3833 | sk->sk_state = BT_DISCONN; | |
3834 | l2cap_sock_set_timer(sk, HZ / 10); | |
3835 | result = L2CAP_CR_SEC_BLOCK; | |
3836 | } | |
3837 | ||
3838 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
3839 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
3840 | rsp.result = cpu_to_le16(result); | |
e7c29cb1 | 3841 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
b1235d79 MH |
3842 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
3843 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
3844 | } | |
1da177e4 LT |
3845 | |
3846 | bh_unlock_sock(sk); | |
3847 | } | |
3848 | ||
3849 | read_unlock(&l->lock); | |
b1235d79 | 3850 | |
1da177e4 LT |
3851 | return 0; |
3852 | } | |
3853 | ||
3854 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
3855 | { | |
3856 | struct l2cap_conn *conn = hcon->l2cap_data; | |
3857 | ||
5a08ecce AE |
3858 | if (!conn) |
3859 | conn = l2cap_conn_add(hcon, 0); | |
3860 | ||
3861 | if (!conn) | |
1da177e4 LT |
3862 | goto drop; |
3863 | ||
3864 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
3865 | ||
e702112f | 3866 | if (!(flags & ACL_CONT)) { |
1da177e4 | 3867 | struct l2cap_hdr *hdr; |
89794813 AE |
3868 | struct sock *sk; |
3869 | u16 cid; | |
1da177e4 LT |
3870 | int len; |
3871 | ||
3872 | if (conn->rx_len) { | |
3873 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
3874 | kfree_skb(conn->rx_skb); | |
3875 | conn->rx_skb = NULL; | |
3876 | conn->rx_len = 0; | |
3877 | l2cap_conn_unreliable(conn, ECOMM); | |
3878 | } | |
3879 | ||
aae7fe22 AE |
3880 | /* Start fragment always begin with Basic L2CAP header */ |
3881 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
3882 | BT_ERR("Frame is too short (len %d)", skb->len); |
3883 | l2cap_conn_unreliable(conn, ECOMM); | |
3884 | goto drop; | |
3885 | } | |
3886 | ||
3887 | hdr = (struct l2cap_hdr *) skb->data; | |
3888 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
89794813 | 3889 | cid = __le16_to_cpu(hdr->cid); |
1da177e4 LT |
3890 | |
3891 | if (len == skb->len) { | |
3892 | /* Complete frame received */ | |
3893 | l2cap_recv_frame(conn, skb); | |
3894 | return 0; | |
3895 | } | |
3896 | ||
3897 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
3898 | ||
3899 | if (skb->len > len) { | |
3900 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
3901 | skb->len, len); | |
3902 | l2cap_conn_unreliable(conn, ECOMM); | |
3903 | goto drop; | |
3904 | } | |
3905 | ||
89794813 AE |
3906 | sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); |
3907 | ||
3908 | if (sk && l2cap_pi(sk)->imtu < len - L2CAP_HDR_SIZE) { | |
3909 | BT_ERR("Frame exceeding recv MTU (len %d, MTU %d)", | |
3910 | len, l2cap_pi(sk)->imtu); | |
3911 | bh_unlock_sock(sk); | |
3912 | l2cap_conn_unreliable(conn, ECOMM); | |
3913 | goto drop; | |
3914 | } | |
3915 | ||
3916 | if (sk) | |
3917 | bh_unlock_sock(sk); | |
3918 | ||
1da177e4 | 3919 | /* Allocate skb for the complete frame (with header) */ |
af05b30b GP |
3920 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
3921 | if (!conn->rx_skb) | |
1da177e4 LT |
3922 | goto drop; |
3923 | ||
d626f62b | 3924 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 3925 | skb->len); |
1da177e4 LT |
3926 | conn->rx_len = len - skb->len; |
3927 | } else { | |
3928 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
3929 | ||
3930 | if (!conn->rx_len) { | |
3931 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
3932 | l2cap_conn_unreliable(conn, ECOMM); | |
3933 | goto drop; | |
3934 | } | |
3935 | ||
3936 | if (skb->len > conn->rx_len) { | |
3937 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
3938 | skb->len, conn->rx_len); | |
3939 | kfree_skb(conn->rx_skb); | |
3940 | conn->rx_skb = NULL; | |
3941 | conn->rx_len = 0; | |
3942 | l2cap_conn_unreliable(conn, ECOMM); | |
3943 | goto drop; | |
3944 | } | |
3945 | ||
d626f62b | 3946 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 3947 | skb->len); |
1da177e4 LT |
3948 | conn->rx_len -= skb->len; |
3949 | ||
3950 | if (!conn->rx_len) { | |
3951 | /* Complete frame received */ | |
3952 | l2cap_recv_frame(conn, conn->rx_skb); | |
3953 | conn->rx_skb = NULL; | |
3954 | } | |
3955 | } | |
3956 | ||
3957 | drop: | |
3958 | kfree_skb(skb); | |
3959 | return 0; | |
3960 | } | |
3961 | ||
aef7d97c | 3962 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 LT |
3963 | { |
3964 | struct sock *sk; | |
3965 | struct hlist_node *node; | |
1da177e4 LT |
3966 | |
3967 | read_lock_bh(&l2cap_sk_list.lock); | |
3968 | ||
be9d1227 MH |
3969 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
3970 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
101545f6 | 3971 | |
903d343e | 3972 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
3973 | batostr(&bt_sk(sk)->src), |
3974 | batostr(&bt_sk(sk)->dst), | |
3975 | sk->sk_state, __le16_to_cpu(pi->psm), | |
3976 | pi->scid, pi->dcid, | |
903d343e GP |
3977 | pi->imtu, pi->omtu, pi->sec_level, |
3978 | pi->mode); | |
be9d1227 | 3979 | } |
1da177e4 | 3980 | |
1da177e4 | 3981 | read_unlock_bh(&l2cap_sk_list.lock); |
1da177e4 | 3982 | |
aef7d97c | 3983 | return 0; |
1da177e4 LT |
3984 | } |
3985 | ||
aef7d97c MH |
3986 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
3987 | { | |
3988 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
3989 | } | |
3990 | ||
3991 | static const struct file_operations l2cap_debugfs_fops = { | |
3992 | .open = l2cap_debugfs_open, | |
3993 | .read = seq_read, | |
3994 | .llseek = seq_lseek, | |
3995 | .release = single_release, | |
3996 | }; | |
3997 | ||
3998 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 3999 | |
1da177e4 LT |
4000 | static struct hci_proto l2cap_hci_proto = { |
4001 | .name = "L2CAP", | |
4002 | .id = HCI_PROTO_L2CAP, | |
4003 | .connect_ind = l2cap_connect_ind, | |
4004 | .connect_cfm = l2cap_connect_cfm, | |
4005 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4006 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4007 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4008 | .recv_acldata = l2cap_recv_acldata |
4009 | }; | |
4010 | ||
64274518 | 4011 | int __init l2cap_init(void) |
1da177e4 LT |
4012 | { |
4013 | int err; | |
be9d1227 | 4014 | |
bb58f747 | 4015 | err = l2cap_init_sockets(); |
1da177e4 LT |
4016 | if (err < 0) |
4017 | return err; | |
4018 | ||
1890d36b | 4019 | _busy_wq = create_singlethread_workqueue("l2cap"); |
b78d7b4f | 4020 | if (!_busy_wq) { |
bb58f747 | 4021 | err = -ENOMEM; |
1da177e4 LT |
4022 | goto error; |
4023 | } | |
4024 | ||
4025 | err = hci_register_proto(&l2cap_hci_proto); | |
4026 | if (err < 0) { | |
4027 | BT_ERR("L2CAP protocol registration failed"); | |
4028 | bt_sock_unregister(BTPROTO_L2CAP); | |
4029 | goto error; | |
4030 | } | |
4031 | ||
aef7d97c MH |
4032 | if (bt_debugfs) { |
4033 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4034 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4035 | if (!l2cap_debugfs) | |
4036 | BT_ERR("Failed to create L2CAP debug file"); | |
4037 | } | |
1da177e4 | 4038 | |
1da177e4 LT |
4039 | return 0; |
4040 | ||
4041 | error: | |
b78d7b4f | 4042 | destroy_workqueue(_busy_wq); |
bb58f747 | 4043 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4044 | return err; |
4045 | } | |
4046 | ||
64274518 | 4047 | void l2cap_exit(void) |
1da177e4 | 4048 | { |
aef7d97c | 4049 | debugfs_remove(l2cap_debugfs); |
1da177e4 | 4050 | |
1890d36b GP |
4051 | flush_workqueue(_busy_wq); |
4052 | destroy_workqueue(_busy_wq); | |
4053 | ||
1da177e4 LT |
4054 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) |
4055 | BT_ERR("L2CAP protocol unregistration failed"); | |
4056 | ||
bb58f747 | 4057 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4058 | } |
4059 | ||
d1c4a17d GP |
4060 | module_param(disable_ertm, bool, 0644); |
4061 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |