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 | ||
1119 | pi->unacked_frames++; | |
d5392c8f | 1120 | pi->frames_sent++; |
1c2acffb GP |
1121 | |
1122 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) | |
1123 | sk->sk_send_head = NULL; | |
1124 | else | |
1125 | sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); | |
9e917af1 GP |
1126 | |
1127 | nsent++; | |
1c2acffb GP |
1128 | } |
1129 | ||
9e917af1 GP |
1130 | return nsent; |
1131 | } | |
1132 | ||
dfc909be GP |
1133 | static int l2cap_retransmit_frames(struct sock *sk) |
1134 | { | |
1135 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1136 | int ret; | |
1137 | ||
dfc909be GP |
1138 | if (!skb_queue_empty(TX_QUEUE(sk))) |
1139 | sk->sk_send_head = TX_QUEUE(sk)->next; | |
1140 | ||
1141 | pi->next_tx_seq = pi->expected_ack_seq; | |
1142 | ret = l2cap_ertm_send(sk); | |
dfc909be GP |
1143 | return ret; |
1144 | } | |
1145 | ||
9a9c6a34 | 1146 | static void l2cap_send_ack(struct l2cap_pinfo *pi) |
9e917af1 GP |
1147 | { |
1148 | struct sock *sk = (struct sock *)pi; | |
1149 | u16 control = 0; | |
1150 | ||
1151 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
1152 | ||
1153 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
1154 | control |= L2CAP_SUPER_RCV_NOT_READY; | |
1890d36b | 1155 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
9a9c6a34 GP |
1156 | l2cap_send_sframe(pi, control); |
1157 | return; | |
9e917af1 | 1158 | } |
dfc909be | 1159 | |
e0f66218 | 1160 | if (l2cap_ertm_send(sk) > 0) |
dfc909be GP |
1161 | return; |
1162 | ||
1163 | control |= L2CAP_SUPER_RCV_READY; | |
1164 | l2cap_send_sframe(pi, control); | |
1c2acffb GP |
1165 | } |
1166 | ||
9a9c6a34 | 1167 | static void l2cap_send_srejtail(struct sock *sk) |
99b0d4b7 GP |
1168 | { |
1169 | struct srej_list *tail; | |
1170 | u16 control; | |
1171 | ||
1172 | control = L2CAP_SUPER_SELECT_REJECT; | |
1173 | control |= L2CAP_CTRL_FINAL; | |
1174 | ||
1175 | tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list); | |
1176 | control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
1177 | ||
1178 | l2cap_send_sframe(l2cap_pi(sk), control); | |
99b0d4b7 GP |
1179 | } |
1180 | ||
1c2acffb GP |
1181 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1182 | { | |
1183 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1184 | struct sk_buff **frag; | |
1185 | int err, sent = 0; | |
1da177e4 | 1186 | |
59203a21 | 1187 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1188 | return -EFAULT; |
1da177e4 LT |
1189 | |
1190 | sent += count; | |
1191 | len -= count; | |
1192 | ||
1193 | /* Continuation fragments (no L2CAP header) */ | |
1194 | frag = &skb_shinfo(skb)->frag_list; | |
1195 | while (len) { | |
1196 | count = min_t(unsigned int, conn->mtu, len); | |
1197 | ||
1198 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1199 | if (!*frag) | |
0175d629 | 1200 | return err; |
1c2acffb GP |
1201 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1202 | return -EFAULT; | |
1da177e4 LT |
1203 | |
1204 | sent += count; | |
1205 | len -= count; | |
1206 | ||
1207 | frag = &(*frag)->next; | |
1208 | } | |
1da177e4 LT |
1209 | |
1210 | return sent; | |
1c2acffb | 1211 | } |
1da177e4 | 1212 | |
fd83ccdb | 1213 | struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len) |
1c2acffb GP |
1214 | { |
1215 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1216 | struct sk_buff *skb; | |
1217 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1218 | struct l2cap_hdr *lh; | |
1219 | ||
1220 | BT_DBG("sk %p len %d", sk, (int)len); | |
1221 | ||
1222 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1223 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1224 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1225 | if (!skb) | |
0175d629 | 1226 | return ERR_PTR(err); |
1c2acffb GP |
1227 | |
1228 | /* Create L2CAP header */ | |
1229 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1230 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1231 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1232 | put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2)); | |
1233 | ||
1234 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1235 | if (unlikely(err < 0)) { | |
1236 | kfree_skb(skb); | |
1237 | return ERR_PTR(err); | |
1238 | } | |
1239 | return skb; | |
1240 | } | |
1241 | ||
fd83ccdb | 1242 | struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len) |
1c2acffb GP |
1243 | { |
1244 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1245 | struct sk_buff *skb; | |
1246 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1247 | struct l2cap_hdr *lh; | |
1248 | ||
1249 | BT_DBG("sk %p len %d", sk, (int)len); | |
1250 | ||
1251 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1252 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1253 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1254 | if (!skb) | |
0175d629 | 1255 | return ERR_PTR(err); |
1c2acffb GP |
1256 | |
1257 | /* Create L2CAP header */ | |
1258 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1259 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1260 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1261 | ||
1262 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1263 | if (unlikely(err < 0)) { | |
1264 | kfree_skb(skb); | |
1265 | return ERR_PTR(err); | |
1266 | } | |
1267 | return skb; | |
1268 | } | |
1269 | ||
fd83ccdb | 1270 | struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen) |
1c2acffb GP |
1271 | { |
1272 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1273 | struct sk_buff *skb; | |
1274 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1275 | struct l2cap_hdr *lh; | |
1276 | ||
1277 | BT_DBG("sk %p len %d", sk, (int)len); | |
1278 | ||
0ee0d208 GP |
1279 | if (!conn) |
1280 | return ERR_PTR(-ENOTCONN); | |
1281 | ||
c74e560c GP |
1282 | if (sdulen) |
1283 | hlen += 2; | |
1284 | ||
fcc203c3 GP |
1285 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1286 | hlen += 2; | |
1287 | ||
1c2acffb GP |
1288 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1289 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1290 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1291 | if (!skb) | |
0175d629 | 1292 | return ERR_PTR(err); |
1c2acffb GP |
1293 | |
1294 | /* Create L2CAP header */ | |
1295 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1296 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1297 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1298 | put_unaligned_le16(control, skb_put(skb, 2)); | |
c74e560c GP |
1299 | if (sdulen) |
1300 | put_unaligned_le16(sdulen, skb_put(skb, 2)); | |
1c2acffb GP |
1301 | |
1302 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1303 | if (unlikely(err < 0)) { | |
1304 | kfree_skb(skb); | |
1305 | return ERR_PTR(err); | |
1306 | } | |
e90bac06 | 1307 | |
fcc203c3 GP |
1308 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1309 | put_unaligned_le16(0, skb_put(skb, 2)); | |
1310 | ||
e90bac06 | 1311 | bt_cb(skb)->retries = 0; |
1c2acffb | 1312 | return skb; |
1da177e4 LT |
1313 | } |
1314 | ||
fd83ccdb | 1315 | int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len) |
c74e560c GP |
1316 | { |
1317 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1318 | struct sk_buff *skb; | |
1319 | struct sk_buff_head sar_queue; | |
1320 | u16 control; | |
1321 | size_t size = 0; | |
1322 | ||
ff12fd64 | 1323 | skb_queue_head_init(&sar_queue); |
c74e560c | 1324 | control = L2CAP_SDU_START; |
1c762159 | 1325 | skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len); |
c74e560c GP |
1326 | if (IS_ERR(skb)) |
1327 | return PTR_ERR(skb); | |
1328 | ||
1329 | __skb_queue_tail(&sar_queue, skb); | |
1c762159 GP |
1330 | len -= pi->remote_mps; |
1331 | size += pi->remote_mps; | |
c74e560c GP |
1332 | |
1333 | while (len > 0) { | |
1334 | size_t buflen; | |
1335 | ||
1c762159 | 1336 | if (len > pi->remote_mps) { |
44651b85 | 1337 | control = L2CAP_SDU_CONTINUE; |
1c762159 | 1338 | buflen = pi->remote_mps; |
c74e560c | 1339 | } else { |
44651b85 | 1340 | control = L2CAP_SDU_END; |
c74e560c GP |
1341 | buflen = len; |
1342 | } | |
1343 | ||
6840ed07 | 1344 | skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0); |
c74e560c GP |
1345 | if (IS_ERR(skb)) { |
1346 | skb_queue_purge(&sar_queue); | |
1347 | return PTR_ERR(skb); | |
1348 | } | |
1349 | ||
1350 | __skb_queue_tail(&sar_queue, skb); | |
1351 | len -= buflen; | |
1352 | size += buflen; | |
c74e560c GP |
1353 | } |
1354 | skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk)); | |
1355 | if (sk->sk_send_head == NULL) | |
1356 | sk->sk_send_head = sar_queue.next; | |
1357 | ||
1358 | return size; | |
1359 | } | |
1360 | ||
1da177e4 LT |
1361 | static void l2cap_chan_ready(struct sock *sk) |
1362 | { | |
1363 | struct sock *parent = bt_sk(sk)->parent; | |
1364 | ||
1365 | BT_DBG("sk %p, parent %p", sk, parent); | |
1366 | ||
1367 | l2cap_pi(sk)->conf_state = 0; | |
1368 | l2cap_sock_clear_timer(sk); | |
1369 | ||
1370 | if (!parent) { | |
1371 | /* Outgoing channel. | |
1372 | * Wake up socket sleeping on connect. | |
1373 | */ | |
1374 | sk->sk_state = BT_CONNECTED; | |
1375 | sk->sk_state_change(sk); | |
1376 | } else { | |
1377 | /* Incoming channel. | |
1378 | * Wake up socket sleeping on accept. | |
1379 | */ | |
1380 | parent->sk_data_ready(parent, 0); | |
1381 | } | |
1382 | } | |
1383 | ||
1384 | /* Copy frame to all raw sockets on that connection */ | |
1385 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
1386 | { | |
1387 | struct l2cap_chan_list *l = &conn->chan_list; | |
1388 | struct sk_buff *nskb; | |
af05b30b | 1389 | struct sock *sk; |
1da177e4 LT |
1390 | |
1391 | BT_DBG("conn %p", conn); | |
1392 | ||
1393 | read_lock(&l->lock); | |
1394 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
1395 | if (sk->sk_type != SOCK_RAW) | |
1396 | continue; | |
1397 | ||
1398 | /* Don't send frame to the socket it came from */ | |
1399 | if (skb->sk == sk) | |
1400 | continue; | |
af05b30b GP |
1401 | nskb = skb_clone(skb, GFP_ATOMIC); |
1402 | if (!nskb) | |
1da177e4 LT |
1403 | continue; |
1404 | ||
1405 | if (sock_queue_rcv_skb(sk, nskb)) | |
1406 | kfree_skb(nskb); | |
1407 | } | |
1408 | read_unlock(&l->lock); | |
1409 | } | |
1410 | ||
1411 | /* ---- L2CAP signalling commands ---- */ | |
1412 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
1413 | u8 code, u8 ident, u16 dlen, void *data) | |
1414 | { | |
1415 | struct sk_buff *skb, **frag; | |
1416 | struct l2cap_cmd_hdr *cmd; | |
1417 | struct l2cap_hdr *lh; | |
1418 | int len, count; | |
1419 | ||
af05b30b GP |
1420 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
1421 | conn, code, ident, dlen); | |
1da177e4 LT |
1422 | |
1423 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
1424 | count = min_t(unsigned int, conn->mtu, len); | |
1425 | ||
1426 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
1427 | if (!skb) | |
1428 | return NULL; | |
1429 | ||
1430 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 1431 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
1432 | |
1433 | if (conn->hcon->type == LE_LINK) | |
1434 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); | |
1435 | else | |
1436 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); | |
1da177e4 LT |
1437 | |
1438 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
1439 | cmd->code = code; | |
1440 | cmd->ident = ident; | |
aca3192c | 1441 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
1442 | |
1443 | if (dlen) { | |
1444 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
1445 | memcpy(skb_put(skb, count), data, count); | |
1446 | data += count; | |
1447 | } | |
1448 | ||
1449 | len -= skb->len; | |
1450 | ||
1451 | /* Continuation fragments (no L2CAP header) */ | |
1452 | frag = &skb_shinfo(skb)->frag_list; | |
1453 | while (len) { | |
1454 | count = min_t(unsigned int, conn->mtu, len); | |
1455 | ||
1456 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
1457 | if (!*frag) | |
1458 | goto fail; | |
1459 | ||
1460 | memcpy(skb_put(*frag, count), data, count); | |
1461 | ||
1462 | len -= count; | |
1463 | data += count; | |
1464 | ||
1465 | frag = &(*frag)->next; | |
1466 | } | |
1467 | ||
1468 | return skb; | |
1469 | ||
1470 | fail: | |
1471 | kfree_skb(skb); | |
1472 | return NULL; | |
1473 | } | |
1474 | ||
1475 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
1476 | { | |
1477 | struct l2cap_conf_opt *opt = *ptr; | |
1478 | int len; | |
1479 | ||
1480 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
1481 | *ptr += len; | |
1482 | ||
1483 | *type = opt->type; | |
1484 | *olen = opt->len; | |
1485 | ||
1486 | switch (opt->len) { | |
1487 | case 1: | |
1488 | *val = *((u8 *) opt->val); | |
1489 | break; | |
1490 | ||
1491 | case 2: | |
bfaaeb3e | 1492 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
1493 | break; |
1494 | ||
1495 | case 4: | |
bfaaeb3e | 1496 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
1497 | break; |
1498 | ||
1499 | default: | |
1500 | *val = (unsigned long) opt->val; | |
1501 | break; | |
1502 | } | |
1503 | ||
1504 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
1505 | return len; | |
1506 | } | |
1507 | ||
1da177e4 LT |
1508 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
1509 | { | |
1510 | struct l2cap_conf_opt *opt = *ptr; | |
1511 | ||
1512 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
1513 | ||
1514 | opt->type = type; | |
1515 | opt->len = len; | |
1516 | ||
1517 | switch (len) { | |
1518 | case 1: | |
1519 | *((u8 *) opt->val) = val; | |
1520 | break; | |
1521 | ||
1522 | case 2: | |
4f8b691c | 1523 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
1524 | break; |
1525 | ||
1526 | case 4: | |
4f8b691c | 1527 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
1528 | break; |
1529 | ||
1530 | default: | |
1531 | memcpy(opt->val, (void *) val, len); | |
1532 | break; | |
1533 | } | |
1534 | ||
1535 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
1536 | } | |
1537 | ||
c1b4f43b GP |
1538 | static void l2cap_ack_timeout(unsigned long arg) |
1539 | { | |
1540 | struct sock *sk = (void *) arg; | |
1541 | ||
1542 | bh_lock_sock(sk); | |
1543 | l2cap_send_ack(l2cap_pi(sk)); | |
1544 | bh_unlock_sock(sk); | |
1545 | } | |
1546 | ||
0565c1c2 GP |
1547 | static inline void l2cap_ertm_init(struct sock *sk) |
1548 | { | |
1549 | l2cap_pi(sk)->expected_ack_seq = 0; | |
1550 | l2cap_pi(sk)->unacked_frames = 0; | |
1551 | l2cap_pi(sk)->buffer_seq = 0; | |
803020c6 | 1552 | l2cap_pi(sk)->num_acked = 0; |
d5392c8f | 1553 | l2cap_pi(sk)->frames_sent = 0; |
0565c1c2 GP |
1554 | |
1555 | setup_timer(&l2cap_pi(sk)->retrans_timer, | |
1556 | l2cap_retrans_timeout, (unsigned long) sk); | |
1557 | setup_timer(&l2cap_pi(sk)->monitor_timer, | |
1558 | l2cap_monitor_timeout, (unsigned long) sk); | |
c1b4f43b GP |
1559 | setup_timer(&l2cap_pi(sk)->ack_timer, |
1560 | l2cap_ack_timeout, (unsigned long) sk); | |
0565c1c2 GP |
1561 | |
1562 | __skb_queue_head_init(SREJ_QUEUE(sk)); | |
1890d36b GP |
1563 | __skb_queue_head_init(BUSY_QUEUE(sk)); |
1564 | ||
1565 | INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work); | |
218bb9df GP |
1566 | |
1567 | sk->sk_backlog_rcv = l2cap_ertm_data_rcv; | |
0565c1c2 GP |
1568 | } |
1569 | ||
f2fcfcd6 GP |
1570 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
1571 | { | |
1572 | switch (mode) { | |
1573 | case L2CAP_MODE_STREAMING: | |
1574 | case L2CAP_MODE_ERTM: | |
1575 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
1576 | return mode; | |
1577 | /* fall through */ | |
1578 | default: | |
1579 | return L2CAP_MODE_BASIC; | |
1580 | } | |
1581 | } | |
1582 | ||
68983259 | 1583 | int l2cap_build_conf_req(struct sock *sk, void *data) |
1da177e4 LT |
1584 | { |
1585 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1586 | struct l2cap_conf_req *req = data; | |
bd3c9e25 | 1587 | struct l2cap_conf_rfc rfc = { .mode = pi->mode }; |
1da177e4 LT |
1588 | void *ptr = req->data; |
1589 | ||
1590 | BT_DBG("sk %p", sk); | |
1591 | ||
f2fcfcd6 GP |
1592 | if (pi->num_conf_req || pi->num_conf_rsp) |
1593 | goto done; | |
1594 | ||
1595 | switch (pi->mode) { | |
1596 | case L2CAP_MODE_STREAMING: | |
1597 | case L2CAP_MODE_ERTM: | |
2ba13ed6 | 1598 | if (pi->conf_state & L2CAP_CONF_STATE2_DEVICE) |
85eb53c6 | 1599 | break; |
85eb53c6 | 1600 | |
2ba13ed6 | 1601 | /* fall through */ |
f2fcfcd6 GP |
1602 | default: |
1603 | pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); | |
1604 | break; | |
1605 | } | |
1606 | ||
1607 | done: | |
7990681c GP |
1608 | if (pi->imtu != L2CAP_DEFAULT_MTU) |
1609 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
1610 | ||
65c7c491 MH |
1611 | switch (pi->mode) { |
1612 | case L2CAP_MODE_BASIC: | |
63406504 GP |
1613 | if (!(pi->conn->feat_mask & L2CAP_FEAT_ERTM) && |
1614 | !(pi->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
1615 | break; | |
1616 | ||
62547752 GP |
1617 | rfc.mode = L2CAP_MODE_BASIC; |
1618 | rfc.txwin_size = 0; | |
1619 | rfc.max_transmit = 0; | |
1620 | rfc.retrans_timeout = 0; | |
1621 | rfc.monitor_timeout = 0; | |
1622 | rfc.max_pdu_size = 0; | |
1623 | ||
63406504 GP |
1624 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1625 | (unsigned long) &rfc); | |
65c7c491 MH |
1626 | break; |
1627 | ||
1628 | case L2CAP_MODE_ERTM: | |
1629 | rfc.mode = L2CAP_MODE_ERTM; | |
14b5aa71 | 1630 | rfc.txwin_size = pi->tx_win; |
68d7f0ce | 1631 | rfc.max_transmit = pi->max_tx; |
f2fcfcd6 GP |
1632 | rfc.retrans_timeout = 0; |
1633 | rfc.monitor_timeout = 0; | |
c74e560c | 1634 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 1635 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 1636 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
f2fcfcd6 | 1637 | |
63406504 GP |
1638 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1639 | (unsigned long) &rfc); | |
1640 | ||
fcc203c3 GP |
1641 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
1642 | break; | |
1643 | ||
1644 | if (pi->fcs == L2CAP_FCS_NONE || | |
1645 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
1646 | pi->fcs = L2CAP_FCS_NONE; | |
1647 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
1648 | } | |
f2fcfcd6 GP |
1649 | break; |
1650 | ||
1651 | case L2CAP_MODE_STREAMING: | |
1652 | rfc.mode = L2CAP_MODE_STREAMING; | |
1653 | rfc.txwin_size = 0; | |
1654 | rfc.max_transmit = 0; | |
1655 | rfc.retrans_timeout = 0; | |
1656 | rfc.monitor_timeout = 0; | |
c74e560c | 1657 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 1658 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 1659 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
65c7c491 | 1660 | |
63406504 GP |
1661 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1662 | (unsigned long) &rfc); | |
1663 | ||
fcc203c3 GP |
1664 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
1665 | break; | |
1666 | ||
1667 | if (pi->fcs == L2CAP_FCS_NONE || | |
1668 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
1669 | pi->fcs = L2CAP_FCS_NONE; | |
1670 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
1671 | } | |
65c7c491 MH |
1672 | break; |
1673 | } | |
1da177e4 | 1674 | |
aca3192c YH |
1675 | req->dcid = cpu_to_le16(pi->dcid); |
1676 | req->flags = cpu_to_le16(0); | |
1da177e4 LT |
1677 | |
1678 | return ptr - data; | |
1679 | } | |
1680 | ||
5dee9e7c | 1681 | static int l2cap_parse_conf_req(struct sock *sk, void *data) |
1da177e4 LT |
1682 | { |
1683 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
5dee9e7c MH |
1684 | struct l2cap_conf_rsp *rsp = data; |
1685 | void *ptr = rsp->data; | |
1686 | void *req = pi->conf_req; | |
1687 | int len = pi->conf_len; | |
1688 | int type, hint, olen; | |
1689 | unsigned long val; | |
6464f35f | 1690 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
861d6882 | 1691 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 1692 | u16 result = L2CAP_CONF_SUCCESS; |
1da177e4 | 1693 | |
5dee9e7c | 1694 | BT_DBG("sk %p", sk); |
820ae1b8 | 1695 | |
5dee9e7c MH |
1696 | while (len >= L2CAP_CONF_OPT_SIZE) { |
1697 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 1698 | |
589d2746 | 1699 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 1700 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
1701 | |
1702 | switch (type) { | |
1703 | case L2CAP_CONF_MTU: | |
861d6882 | 1704 | mtu = val; |
5dee9e7c MH |
1705 | break; |
1706 | ||
1707 | case L2CAP_CONF_FLUSH_TO: | |
1708 | pi->flush_to = val; | |
1709 | break; | |
1710 | ||
1711 | case L2CAP_CONF_QOS: | |
1712 | break; | |
1713 | ||
6464f35f MH |
1714 | case L2CAP_CONF_RFC: |
1715 | if (olen == sizeof(rfc)) | |
1716 | memcpy(&rfc, (void *) val, olen); | |
1717 | break; | |
1718 | ||
fcc203c3 GP |
1719 | case L2CAP_CONF_FCS: |
1720 | if (val == L2CAP_FCS_NONE) | |
1721 | pi->conf_state |= L2CAP_CONF_NO_FCS_RECV; | |
1722 | ||
1723 | break; | |
1724 | ||
5dee9e7c MH |
1725 | default: |
1726 | if (hint) | |
1727 | break; | |
1728 | ||
1729 | result = L2CAP_CONF_UNKNOWN; | |
1730 | *((u8 *) ptr++) = type; | |
1731 | break; | |
1732 | } | |
1733 | } | |
1734 | ||
e9aeb2dd | 1735 | if (pi->num_conf_rsp || pi->num_conf_req > 1) |
f2fcfcd6 GP |
1736 | goto done; |
1737 | ||
1738 | switch (pi->mode) { | |
1739 | case L2CAP_MODE_STREAMING: | |
1740 | case L2CAP_MODE_ERTM: | |
85eb53c6 GP |
1741 | if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) { |
1742 | pi->mode = l2cap_select_mode(rfc.mode, | |
1743 | pi->conn->feat_mask); | |
1744 | break; | |
1745 | } | |
1746 | ||
742e519b | 1747 | if (pi->mode != rfc.mode) |
f2fcfcd6 | 1748 | return -ECONNREFUSED; |
742e519b | 1749 | |
f2fcfcd6 | 1750 | break; |
f2fcfcd6 GP |
1751 | } |
1752 | ||
1753 | done: | |
1754 | if (pi->mode != rfc.mode) { | |
1755 | result = L2CAP_CONF_UNACCEPT; | |
1756 | rfc.mode = pi->mode; | |
1757 | ||
1758 | if (pi->num_conf_rsp == 1) | |
1759 | return -ECONNREFUSED; | |
1760 | ||
1761 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1762 | sizeof(rfc), (unsigned long) &rfc); | |
1763 | } | |
1764 | ||
1765 | ||
5dee9e7c MH |
1766 | if (result == L2CAP_CONF_SUCCESS) { |
1767 | /* Configure output options and let the other side know | |
1768 | * which ones we don't like. */ | |
1769 | ||
f2fcfcd6 GP |
1770 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
1771 | result = L2CAP_CONF_UNACCEPT; | |
1772 | else { | |
1773 | pi->omtu = mtu; | |
1774 | pi->conf_state |= L2CAP_CONF_MTU_DONE; | |
1775 | } | |
1776 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); | |
6464f35f | 1777 | |
f2fcfcd6 GP |
1778 | switch (rfc.mode) { |
1779 | case L2CAP_MODE_BASIC: | |
1780 | pi->fcs = L2CAP_FCS_NONE; | |
1781 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
1782 | break; | |
1783 | ||
1784 | case L2CAP_MODE_ERTM: | |
1785 | pi->remote_tx_win = rfc.txwin_size; | |
1786 | pi->remote_max_tx = rfc.max_transmit; | |
86b1b263 MM |
1787 | |
1788 | if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) | |
1789 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); | |
1c762159 GP |
1790 | |
1791 | pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 | 1792 | |
10467e9e GP |
1793 | rfc.retrans_timeout = |
1794 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
1795 | rfc.monitor_timeout = | |
1796 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 GP |
1797 | |
1798 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
1799 | |
1800 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1801 | sizeof(rfc), (unsigned long) &rfc); | |
1802 | ||
f2fcfcd6 GP |
1803 | break; |
1804 | ||
1805 | case L2CAP_MODE_STREAMING: | |
86b1b263 MM |
1806 | if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) |
1807 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); | |
1c762159 GP |
1808 | |
1809 | pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 GP |
1810 | |
1811 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
1812 | |
1813 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1814 | sizeof(rfc), (unsigned long) &rfc); | |
1815 | ||
f2fcfcd6 GP |
1816 | break; |
1817 | ||
1818 | default: | |
5dee9e7c | 1819 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 1820 | |
6464f35f | 1821 | memset(&rfc, 0, sizeof(rfc)); |
f2fcfcd6 GP |
1822 | rfc.mode = pi->mode; |
1823 | } | |
6464f35f | 1824 | |
f2fcfcd6 GP |
1825 | if (result == L2CAP_CONF_SUCCESS) |
1826 | pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; | |
1827 | } | |
5dee9e7c MH |
1828 | rsp->scid = cpu_to_le16(pi->dcid); |
1829 | rsp->result = cpu_to_le16(result); | |
1830 | rsp->flags = cpu_to_le16(0x0000); | |
1831 | ||
1832 | return ptr - data; | |
1da177e4 LT |
1833 | } |
1834 | ||
f2fcfcd6 GP |
1835 | static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result) |
1836 | { | |
1837 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1838 | struct l2cap_conf_req *req = data; | |
1839 | void *ptr = req->data; | |
1840 | int type, olen; | |
1841 | unsigned long val; | |
1842 | struct l2cap_conf_rfc rfc; | |
1843 | ||
1844 | BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data); | |
1845 | ||
1846 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
1847 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
1848 | ||
1849 | switch (type) { | |
1850 | case L2CAP_CONF_MTU: | |
1851 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
1852 | *result = L2CAP_CONF_UNACCEPT; | |
8183b775 | 1853 | pi->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 1854 | } else |
8183b775 AE |
1855 | pi->imtu = val; |
1856 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
f2fcfcd6 GP |
1857 | break; |
1858 | ||
1859 | case L2CAP_CONF_FLUSH_TO: | |
1860 | pi->flush_to = val; | |
1861 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, | |
1862 | 2, pi->flush_to); | |
1863 | break; | |
1864 | ||
1865 | case L2CAP_CONF_RFC: | |
1866 | if (olen == sizeof(rfc)) | |
1867 | memcpy(&rfc, (void *)val, olen); | |
1868 | ||
1869 | if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) && | |
1870 | rfc.mode != pi->mode) | |
1871 | return -ECONNREFUSED; | |
1872 | ||
f2fcfcd6 GP |
1873 | pi->fcs = 0; |
1874 | ||
1875 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1876 | sizeof(rfc), (unsigned long) &rfc); | |
1877 | break; | |
1878 | } | |
1879 | } | |
1880 | ||
6c2ea7a8 GP |
1881 | if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode) |
1882 | return -ECONNREFUSED; | |
1883 | ||
1884 | pi->mode = rfc.mode; | |
1885 | ||
f2fcfcd6 GP |
1886 | if (*result == L2CAP_CONF_SUCCESS) { |
1887 | switch (rfc.mode) { | |
1888 | case L2CAP_MODE_ERTM: | |
10467e9e GP |
1889 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
1890 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
1c762159 | 1891 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
1892 | break; |
1893 | case L2CAP_MODE_STREAMING: | |
1c762159 | 1894 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
1895 | } |
1896 | } | |
1897 | ||
1898 | req->dcid = cpu_to_le16(pi->dcid); | |
1899 | req->flags = cpu_to_le16(0x0000); | |
1900 | ||
1901 | return ptr - data; | |
1902 | } | |
1903 | ||
5dee9e7c | 1904 | static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) |
1da177e4 LT |
1905 | { |
1906 | struct l2cap_conf_rsp *rsp = data; | |
1907 | void *ptr = rsp->data; | |
1da177e4 | 1908 | |
5dee9e7c | 1909 | BT_DBG("sk %p", sk); |
1da177e4 | 1910 | |
aca3192c | 1911 | rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
5dee9e7c | 1912 | rsp->result = cpu_to_le16(result); |
aca3192c | 1913 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
1914 | |
1915 | return ptr - data; | |
1916 | } | |
1917 | ||
7b1c0049 GP |
1918 | static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len) |
1919 | { | |
1920 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1921 | int type, olen; | |
1922 | unsigned long val; | |
1923 | struct l2cap_conf_rfc rfc; | |
1924 | ||
1925 | BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len); | |
1926 | ||
1927 | if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING)) | |
1928 | return; | |
1929 | ||
1930 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
1931 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
1932 | ||
1933 | switch (type) { | |
1934 | case L2CAP_CONF_RFC: | |
1935 | if (olen == sizeof(rfc)) | |
1936 | memcpy(&rfc, (void *)val, olen); | |
1937 | goto done; | |
1938 | } | |
1939 | } | |
1940 | ||
1941 | done: | |
1942 | switch (rfc.mode) { | |
1943 | case L2CAP_MODE_ERTM: | |
10467e9e GP |
1944 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
1945 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
7b1c0049 GP |
1946 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
1947 | break; | |
1948 | case L2CAP_MODE_STREAMING: | |
1949 | pi->mps = le16_to_cpu(rfc.max_pdu_size); | |
1950 | } | |
1951 | } | |
1952 | ||
4e8402a3 MH |
1953 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
1954 | { | |
1955 | struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; | |
1956 | ||
1957 | if (rej->reason != 0x0000) | |
1958 | return 0; | |
1959 | ||
1960 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
1961 | cmd->ident == conn->info_ident) { | |
4e8402a3 | 1962 | del_timer(&conn->info_timer); |
984947dc MH |
1963 | |
1964 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 1965 | conn->info_ident = 0; |
984947dc | 1966 | |
4e8402a3 MH |
1967 | l2cap_conn_start(conn); |
1968 | } | |
1969 | ||
1970 | return 0; | |
1971 | } | |
1972 | ||
1da177e4 LT |
1973 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
1974 | { | |
1975 | struct l2cap_chan_list *list = &conn->chan_list; | |
1976 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; | |
1977 | struct l2cap_conn_rsp rsp; | |
d793fe8c | 1978 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 1979 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
1980 | |
1981 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 1982 | __le16 psm = req->psm; |
1da177e4 LT |
1983 | |
1984 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
1985 | ||
1986 | /* Check if we have socket listening on psm */ | |
1987 | parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); | |
1988 | if (!parent) { | |
1989 | result = L2CAP_CR_BAD_PSM; | |
1990 | goto sendresp; | |
1991 | } | |
1992 | ||
e0f0cb56 GP |
1993 | bh_lock_sock(parent); |
1994 | ||
e7c29cb1 MH |
1995 | /* Check if the ACL is secure enough (if not SDP) */ |
1996 | if (psm != cpu_to_le16(0x0001) && | |
1997 | !hci_conn_check_link_mode(conn->hcon)) { | |
2950f21a | 1998 | conn->disc_reason = 0x05; |
e7c29cb1 MH |
1999 | result = L2CAP_CR_SEC_BLOCK; |
2000 | goto response; | |
2001 | } | |
2002 | ||
1da177e4 LT |
2003 | result = L2CAP_CR_NO_MEM; |
2004 | ||
2005 | /* Check for backlog size */ | |
2006 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2007 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2008 | goto response; |
2009 | } | |
2010 | ||
3b1e0a65 | 2011 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); |
1da177e4 LT |
2012 | if (!sk) |
2013 | goto response; | |
2014 | ||
fd1278d7 | 2015 | write_lock_bh(&list->lock); |
1da177e4 LT |
2016 | |
2017 | /* Check if we already have channel with that dcid */ | |
2018 | if (__l2cap_get_chan_by_dcid(list, scid)) { | |
fd1278d7 | 2019 | write_unlock_bh(&list->lock); |
1da177e4 LT |
2020 | sock_set_flag(sk, SOCK_ZAPPED); |
2021 | l2cap_sock_kill(sk); | |
2022 | goto response; | |
2023 | } | |
2024 | ||
2025 | hci_conn_hold(conn->hcon); | |
2026 | ||
2027 | l2cap_sock_init(sk, parent); | |
2028 | bacpy(&bt_sk(sk)->src, conn->src); | |
2029 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
2030 | l2cap_pi(sk)->psm = psm; | |
2031 | l2cap_pi(sk)->dcid = scid; | |
2032 | ||
2033 | __l2cap_chan_add(conn, sk, parent); | |
2034 | dcid = l2cap_pi(sk)->scid; | |
2035 | ||
2036 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
2037 | ||
1da177e4 LT |
2038 | l2cap_pi(sk)->ident = cmd->ident; |
2039 | ||
984947dc | 2040 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
2af6b9d5 | 2041 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
2042 | if (bt_sk(sk)->defer_setup) { |
2043 | sk->sk_state = BT_CONNECT2; | |
2044 | result = L2CAP_CR_PEND; | |
2045 | status = L2CAP_CS_AUTHOR_PEND; | |
2046 | parent->sk_data_ready(parent, 0); | |
2047 | } else { | |
2048 | sk->sk_state = BT_CONFIG; | |
2049 | result = L2CAP_CR_SUCCESS; | |
2050 | status = L2CAP_CS_NO_INFO; | |
2051 | } | |
79d554a6 MH |
2052 | } else { |
2053 | sk->sk_state = BT_CONNECT2; | |
2054 | result = L2CAP_CR_PEND; | |
2055 | status = L2CAP_CS_AUTHEN_PEND; | |
2056 | } | |
2057 | } else { | |
2058 | sk->sk_state = BT_CONNECT2; | |
2059 | result = L2CAP_CR_PEND; | |
2060 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2061 | } |
2062 | ||
fd1278d7 | 2063 | write_unlock_bh(&list->lock); |
1da177e4 LT |
2064 | |
2065 | response: | |
2066 | bh_unlock_sock(parent); | |
2067 | ||
2068 | sendresp: | |
aca3192c YH |
2069 | rsp.scid = cpu_to_le16(scid); |
2070 | rsp.dcid = cpu_to_le16(dcid); | |
2071 | rsp.result = cpu_to_le16(result); | |
2072 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2073 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2074 | |
2075 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2076 | struct l2cap_info_req info; | |
2077 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2078 | ||
2079 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2080 | conn->info_ident = l2cap_get_ident(conn); | |
2081 | ||
2082 | mod_timer(&conn->info_timer, jiffies + | |
2083 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
2084 | ||
2085 | l2cap_send_cmd(conn, conn->info_ident, | |
2086 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2087 | } | |
2088 | ||
d793fe8c | 2089 | if (sk && !(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) && |
e9aeb2dd GP |
2090 | result == L2CAP_CR_SUCCESS) { |
2091 | u8 buf[128]; | |
2092 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
2093 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
2094 | l2cap_build_conf_req(sk, buf), buf); | |
2095 | l2cap_pi(sk)->num_conf_req++; | |
2096 | } | |
2097 | ||
1da177e4 LT |
2098 | return 0; |
2099 | } | |
2100 | ||
2101 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2102 | { | |
2103 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2104 | u16 scid, dcid, result, status; | |
2105 | struct sock *sk; | |
2106 | u8 req[128]; | |
2107 | ||
2108 | scid = __le16_to_cpu(rsp->scid); | |
2109 | dcid = __le16_to_cpu(rsp->dcid); | |
2110 | result = __le16_to_cpu(rsp->result); | |
2111 | status = __le16_to_cpu(rsp->status); | |
2112 | ||
2113 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2114 | ||
2115 | if (scid) { | |
af05b30b GP |
2116 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2117 | if (!sk) | |
57d3b22b | 2118 | return -EFAULT; |
1da177e4 | 2119 | } else { |
af05b30b GP |
2120 | sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident); |
2121 | if (!sk) | |
57d3b22b | 2122 | return -EFAULT; |
1da177e4 LT |
2123 | } |
2124 | ||
2125 | switch (result) { | |
2126 | case L2CAP_CR_SUCCESS: | |
2127 | sk->sk_state = BT_CONFIG; | |
2128 | l2cap_pi(sk)->ident = 0; | |
2129 | l2cap_pi(sk)->dcid = dcid; | |
6a8d3010 MH |
2130 | l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; |
2131 | ||
e9aeb2dd GP |
2132 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) |
2133 | break; | |
2134 | ||
2135 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
2136 | ||
1da177e4 LT |
2137 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2138 | l2cap_build_conf_req(sk, req), req); | |
f2fcfcd6 | 2139 | l2cap_pi(sk)->num_conf_req++; |
1da177e4 LT |
2140 | break; |
2141 | ||
2142 | case L2CAP_CR_PEND: | |
6a8d3010 | 2143 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 LT |
2144 | break; |
2145 | ||
2146 | default: | |
a49184c2 AE |
2147 | /* don't delete l2cap channel if sk is owned by user */ |
2148 | if (sock_owned_by_user(sk)) { | |
2149 | sk->sk_state = BT_DISCONN; | |
2150 | l2cap_sock_clear_timer(sk); | |
2151 | l2cap_sock_set_timer(sk, HZ / 5); | |
2152 | break; | |
2153 | } | |
2154 | ||
1da177e4 LT |
2155 | l2cap_chan_del(sk, ECONNREFUSED); |
2156 | break; | |
2157 | } | |
2158 | ||
2159 | bh_unlock_sock(sk); | |
2160 | return 0; | |
2161 | } | |
2162 | ||
8c462b60 MM |
2163 | static inline void set_default_fcs(struct l2cap_pinfo *pi) |
2164 | { | |
2165 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
2166 | * sides request it. | |
2167 | */ | |
2168 | if (pi->mode != L2CAP_MODE_ERTM && pi->mode != L2CAP_MODE_STREAMING) | |
2169 | pi->fcs = L2CAP_FCS_NONE; | |
2170 | else if (!(pi->conf_state & L2CAP_CONF_NO_FCS_RECV)) | |
2171 | pi->fcs = L2CAP_FCS_CRC16; | |
2172 | } | |
2173 | ||
88219a0f | 2174 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
2175 | { |
2176 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
2177 | u16 dcid, flags; | |
2178 | u8 rsp[64]; | |
2179 | struct sock *sk; | |
5dee9e7c | 2180 | int len; |
1da177e4 LT |
2181 | |
2182 | dcid = __le16_to_cpu(req->dcid); | |
2183 | flags = __le16_to_cpu(req->flags); | |
2184 | ||
2185 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
2186 | ||
af05b30b GP |
2187 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
2188 | if (!sk) | |
1da177e4 LT |
2189 | return -ENOENT; |
2190 | ||
df6bd743 GP |
2191 | if (sk->sk_state != BT_CONFIG) { |
2192 | struct l2cap_cmd_rej rej; | |
2193 | ||
2194 | rej.reason = cpu_to_le16(0x0002); | |
2195 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, | |
2196 | sizeof(rej), &rej); | |
354f60a9 | 2197 | goto unlock; |
df6bd743 | 2198 | } |
354f60a9 | 2199 | |
5dee9e7c | 2200 | /* Reject if config buffer is too small. */ |
88219a0f | 2201 | len = cmd_len - sizeof(*req); |
5dee9e7c MH |
2202 | if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) { |
2203 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
2204 | l2cap_build_conf_rsp(sk, rsp, | |
2205 | L2CAP_CONF_REJECT, flags), rsp); | |
2206 | goto unlock; | |
2207 | } | |
2208 | ||
2209 | /* Store config. */ | |
2210 | memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len); | |
2211 | l2cap_pi(sk)->conf_len += len; | |
1da177e4 LT |
2212 | |
2213 | if (flags & 0x0001) { | |
2214 | /* Incomplete config. Send empty response. */ | |
2215 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
5dee9e7c MH |
2216 | l2cap_build_conf_rsp(sk, rsp, |
2217 | L2CAP_CONF_SUCCESS, 0x0001), rsp); | |
1da177e4 LT |
2218 | goto unlock; |
2219 | } | |
2220 | ||
2221 | /* Complete config. */ | |
5dee9e7c | 2222 | len = l2cap_parse_conf_req(sk, rsp); |
f2fcfcd6 | 2223 | if (len < 0) { |
9b108fc0 | 2224 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
1da177e4 | 2225 | goto unlock; |
f2fcfcd6 | 2226 | } |
1da177e4 | 2227 | |
5dee9e7c | 2228 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
f2fcfcd6 | 2229 | l2cap_pi(sk)->num_conf_rsp++; |
5dee9e7c | 2230 | |
5dee9e7c MH |
2231 | /* Reset config buffer. */ |
2232 | l2cap_pi(sk)->conf_len = 0; | |
2233 | ||
876d9484 MH |
2234 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) |
2235 | goto unlock; | |
2236 | ||
1da177e4 | 2237 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { |
8c462b60 | 2238 | set_default_fcs(l2cap_pi(sk)); |
fcc203c3 | 2239 | |
1da177e4 | 2240 | sk->sk_state = BT_CONNECTED; |
e90bac06 | 2241 | |
0565c1c2 GP |
2242 | l2cap_pi(sk)->next_tx_seq = 0; |
2243 | l2cap_pi(sk)->expected_tx_seq = 0; | |
1c2acffb | 2244 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 GP |
2245 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
2246 | l2cap_ertm_init(sk); | |
2247 | ||
1da177e4 | 2248 | l2cap_chan_ready(sk); |
876d9484 MH |
2249 | goto unlock; |
2250 | } | |
2251 | ||
2252 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { | |
79d554a6 | 2253 | u8 buf[64]; |
ab3e5715 | 2254 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; |
1da177e4 | 2255 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
79d554a6 | 2256 | l2cap_build_conf_req(sk, buf), buf); |
f2fcfcd6 | 2257 | l2cap_pi(sk)->num_conf_req++; |
1da177e4 LT |
2258 | } |
2259 | ||
2260 | unlock: | |
2261 | bh_unlock_sock(sk); | |
2262 | return 0; | |
2263 | } | |
2264 | ||
2265 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2266 | { | |
2267 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
2268 | u16 scid, flags, result; | |
2269 | struct sock *sk; | |
7b1c0049 | 2270 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
2271 | |
2272 | scid = __le16_to_cpu(rsp->scid); | |
2273 | flags = __le16_to_cpu(rsp->flags); | |
2274 | result = __le16_to_cpu(rsp->result); | |
2275 | ||
af05b30b GP |
2276 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
2277 | scid, flags, result); | |
1da177e4 | 2278 | |
af05b30b GP |
2279 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2280 | if (!sk) | |
1da177e4 LT |
2281 | return 0; |
2282 | ||
2283 | switch (result) { | |
2284 | case L2CAP_CONF_SUCCESS: | |
7b1c0049 | 2285 | l2cap_conf_rfc_get(sk, rsp->data, len); |
1da177e4 LT |
2286 | break; |
2287 | ||
2288 | case L2CAP_CONF_UNACCEPT: | |
f2fcfcd6 | 2289 | if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
2290 | char req[64]; |
2291 | ||
c2c77ec8 | 2292 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
9b108fc0 | 2293 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
c2c77ec8 AE |
2294 | goto done; |
2295 | } | |
2296 | ||
f2fcfcd6 GP |
2297 | /* throw out any old stored conf requests */ |
2298 | result = L2CAP_CONF_SUCCESS; | |
2299 | len = l2cap_parse_conf_rsp(sk, rsp->data, | |
2300 | len, req, &result); | |
2301 | if (len < 0) { | |
9b108fc0 | 2302 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
f2fcfcd6 GP |
2303 | goto done; |
2304 | } | |
2305 | ||
2306 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2307 | L2CAP_CONF_REQ, len, req); | |
2308 | l2cap_pi(sk)->num_conf_req++; | |
2309 | if (result != L2CAP_CONF_SUCCESS) | |
2310 | goto done; | |
2311 | break; | |
1da177e4 LT |
2312 | } |
2313 | ||
8e87d142 | 2314 | default: |
b1235d79 | 2315 | sk->sk_err = ECONNRESET; |
1da177e4 | 2316 | l2cap_sock_set_timer(sk, HZ * 5); |
9b108fc0 | 2317 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
1da177e4 LT |
2318 | goto done; |
2319 | } | |
2320 | ||
2321 | if (flags & 0x01) | |
2322 | goto done; | |
2323 | ||
1da177e4 LT |
2324 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; |
2325 | ||
2326 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { | |
8c462b60 | 2327 | set_default_fcs(l2cap_pi(sk)); |
fcc203c3 | 2328 | |
1da177e4 | 2329 | sk->sk_state = BT_CONNECTED; |
0565c1c2 | 2330 | l2cap_pi(sk)->next_tx_seq = 0; |
1c2acffb | 2331 | l2cap_pi(sk)->expected_tx_seq = 0; |
1c2acffb | 2332 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 GP |
2333 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
2334 | l2cap_ertm_init(sk); | |
2335 | ||
1da177e4 LT |
2336 | l2cap_chan_ready(sk); |
2337 | } | |
2338 | ||
2339 | done: | |
2340 | bh_unlock_sock(sk); | |
2341 | return 0; | |
2342 | } | |
2343 | ||
2344 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2345 | { | |
2346 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
2347 | struct l2cap_disconn_rsp rsp; | |
2348 | u16 dcid, scid; | |
2349 | struct sock *sk; | |
2350 | ||
2351 | scid = __le16_to_cpu(req->scid); | |
2352 | dcid = __le16_to_cpu(req->dcid); | |
2353 | ||
2354 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
2355 | ||
af05b30b GP |
2356 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
2357 | if (!sk) | |
1da177e4 LT |
2358 | return 0; |
2359 | ||
aca3192c YH |
2360 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); |
2361 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1da177e4 LT |
2362 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
2363 | ||
2364 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2365 | ||
a49184c2 AE |
2366 | /* don't delete l2cap channel if sk is owned by user */ |
2367 | if (sock_owned_by_user(sk)) { | |
2368 | sk->sk_state = BT_DISCONN; | |
2369 | l2cap_sock_clear_timer(sk); | |
2370 | l2cap_sock_set_timer(sk, HZ / 5); | |
2371 | bh_unlock_sock(sk); | |
2372 | return 0; | |
2373 | } | |
2374 | ||
1da177e4 LT |
2375 | l2cap_chan_del(sk, ECONNRESET); |
2376 | bh_unlock_sock(sk); | |
2377 | ||
2378 | l2cap_sock_kill(sk); | |
2379 | return 0; | |
2380 | } | |
2381 | ||
2382 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2383 | { | |
2384 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
2385 | u16 dcid, scid; | |
2386 | struct sock *sk; | |
2387 | ||
2388 | scid = __le16_to_cpu(rsp->scid); | |
2389 | dcid = __le16_to_cpu(rsp->dcid); | |
2390 | ||
2391 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
2392 | ||
af05b30b GP |
2393 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2394 | if (!sk) | |
1da177e4 LT |
2395 | return 0; |
2396 | ||
a49184c2 AE |
2397 | /* don't delete l2cap channel if sk is owned by user */ |
2398 | if (sock_owned_by_user(sk)) { | |
2399 | sk->sk_state = BT_DISCONN; | |
2400 | l2cap_sock_clear_timer(sk); | |
2401 | l2cap_sock_set_timer(sk, HZ / 5); | |
2402 | bh_unlock_sock(sk); | |
2403 | return 0; | |
2404 | } | |
2405 | ||
1da177e4 LT |
2406 | l2cap_chan_del(sk, 0); |
2407 | bh_unlock_sock(sk); | |
2408 | ||
2409 | l2cap_sock_kill(sk); | |
2410 | return 0; | |
2411 | } | |
2412 | ||
2413 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2414 | { | |
2415 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
2416 | u16 type; |
2417 | ||
2418 | type = __le16_to_cpu(req->type); | |
2419 | ||
2420 | BT_DBG("type 0x%4.4x", type); | |
2421 | ||
f0709e03 MH |
2422 | if (type == L2CAP_IT_FEAT_MASK) { |
2423 | u8 buf[8]; | |
44dd46de | 2424 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
2425 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
2426 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2427 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 2428 | if (!disable_ertm) |
fcc203c3 GP |
2429 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2430 | | L2CAP_FEAT_FCS; | |
1b7bf4ed | 2431 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
2432 | l2cap_send_cmd(conn, cmd->ident, |
2433 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
2434 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
2435 | u8 buf[12]; | |
2436 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
2437 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2438 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
2439 | memcpy(buf + 4, l2cap_fixed_chan, 8); | |
2440 | l2cap_send_cmd(conn, cmd->ident, | |
2441 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
2442 | } else { |
2443 | struct l2cap_info_rsp rsp; | |
2444 | rsp.type = cpu_to_le16(type); | |
2445 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
2446 | l2cap_send_cmd(conn, cmd->ident, | |
2447 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
2448 | } | |
1da177e4 LT |
2449 | |
2450 | return 0; | |
2451 | } | |
2452 | ||
2453 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2454 | { | |
2455 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
2456 | u16 type, result; | |
2457 | ||
2458 | type = __le16_to_cpu(rsp->type); | |
2459 | result = __le16_to_cpu(rsp->result); | |
2460 | ||
2461 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
2462 | ||
4e8402a3 MH |
2463 | del_timer(&conn->info_timer); |
2464 | ||
adb08ede VT |
2465 | if (result != L2CAP_IR_SUCCESS) { |
2466 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2467 | conn->info_ident = 0; | |
2468 | ||
2469 | l2cap_conn_start(conn); | |
2470 | ||
2471 | return 0; | |
2472 | } | |
2473 | ||
984947dc | 2474 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 2475 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 2476 | |
47ec1dcd | 2477 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
2478 | struct l2cap_info_req req; |
2479 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2480 | ||
2481 | conn->info_ident = l2cap_get_ident(conn); | |
2482 | ||
2483 | l2cap_send_cmd(conn, conn->info_ident, | |
2484 | L2CAP_INFO_REQ, sizeof(req), &req); | |
2485 | } else { | |
2486 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2487 | conn->info_ident = 0; | |
2488 | ||
2489 | l2cap_conn_start(conn); | |
2490 | } | |
2491 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 2492 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 2493 | conn->info_ident = 0; |
984947dc MH |
2494 | |
2495 | l2cap_conn_start(conn); | |
2496 | } | |
4e8402a3 | 2497 | |
1da177e4 LT |
2498 | return 0; |
2499 | } | |
2500 | ||
e2174ca4 | 2501 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
2502 | u16 to_multiplier) |
2503 | { | |
2504 | u16 max_latency; | |
2505 | ||
2506 | if (min > max || min < 6 || max > 3200) | |
2507 | return -EINVAL; | |
2508 | ||
2509 | if (to_multiplier < 10 || to_multiplier > 3200) | |
2510 | return -EINVAL; | |
2511 | ||
2512 | if (max >= to_multiplier * 8) | |
2513 | return -EINVAL; | |
2514 | ||
2515 | max_latency = (to_multiplier * 8 / max) - 1; | |
2516 | if (latency > 499 || latency > max_latency) | |
2517 | return -EINVAL; | |
2518 | ||
2519 | return 0; | |
2520 | } | |
2521 | ||
2522 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
2523 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
2524 | { | |
2525 | struct hci_conn *hcon = conn->hcon; | |
2526 | struct l2cap_conn_param_update_req *req; | |
2527 | struct l2cap_conn_param_update_rsp rsp; | |
2528 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 2529 | int err; |
de73115a CT |
2530 | |
2531 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
2532 | return -EINVAL; | |
2533 | ||
2534 | cmd_len = __le16_to_cpu(cmd->len); | |
2535 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
2536 | return -EPROTO; | |
2537 | ||
2538 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
2539 | min = __le16_to_cpu(req->min); |
2540 | max = __le16_to_cpu(req->max); | |
de73115a CT |
2541 | latency = __le16_to_cpu(req->latency); |
2542 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
2543 | ||
2544 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2545 | min, max, latency, to_multiplier); | |
2546 | ||
2547 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
2548 | |
2549 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
2550 | if (err) | |
de73115a CT |
2551 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
2552 | else | |
2553 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); | |
2554 | ||
2555 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2556 | sizeof(rsp), &rsp); | |
2557 | ||
2ce603eb CT |
2558 | if (!err) |
2559 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
2560 | ||
de73115a CT |
2561 | return 0; |
2562 | } | |
2563 | ||
3300d9a9 CT |
2564 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2565 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
2566 | { | |
2567 | int err = 0; | |
2568 | ||
2569 | switch (cmd->code) { | |
2570 | case L2CAP_COMMAND_REJ: | |
2571 | l2cap_command_rej(conn, cmd, data); | |
2572 | break; | |
2573 | ||
2574 | case L2CAP_CONN_REQ: | |
2575 | err = l2cap_connect_req(conn, cmd, data); | |
2576 | break; | |
2577 | ||
2578 | case L2CAP_CONN_RSP: | |
2579 | err = l2cap_connect_rsp(conn, cmd, data); | |
2580 | break; | |
2581 | ||
2582 | case L2CAP_CONF_REQ: | |
2583 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
2584 | break; | |
2585 | ||
2586 | case L2CAP_CONF_RSP: | |
2587 | err = l2cap_config_rsp(conn, cmd, data); | |
2588 | break; | |
2589 | ||
2590 | case L2CAP_DISCONN_REQ: | |
2591 | err = l2cap_disconnect_req(conn, cmd, data); | |
2592 | break; | |
2593 | ||
2594 | case L2CAP_DISCONN_RSP: | |
2595 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
2596 | break; | |
2597 | ||
2598 | case L2CAP_ECHO_REQ: | |
2599 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
2600 | break; | |
2601 | ||
2602 | case L2CAP_ECHO_RSP: | |
2603 | break; | |
2604 | ||
2605 | case L2CAP_INFO_REQ: | |
2606 | err = l2cap_information_req(conn, cmd, data); | |
2607 | break; | |
2608 | ||
2609 | case L2CAP_INFO_RSP: | |
2610 | err = l2cap_information_rsp(conn, cmd, data); | |
2611 | break; | |
2612 | ||
2613 | default: | |
2614 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
2615 | err = -EINVAL; | |
2616 | break; | |
2617 | } | |
2618 | ||
2619 | return err; | |
2620 | } | |
2621 | ||
2622 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
2623 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
2624 | { | |
2625 | switch (cmd->code) { | |
2626 | case L2CAP_COMMAND_REJ: | |
2627 | return 0; | |
2628 | ||
2629 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 2630 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
2631 | |
2632 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
2633 | return 0; | |
2634 | ||
2635 | default: | |
2636 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
2637 | return -EINVAL; | |
2638 | } | |
2639 | } | |
2640 | ||
2641 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
2642 | struct sk_buff *skb) | |
1da177e4 LT |
2643 | { |
2644 | u8 *data = skb->data; | |
2645 | int len = skb->len; | |
2646 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 2647 | int err; |
1da177e4 LT |
2648 | |
2649 | l2cap_raw_recv(conn, skb); | |
2650 | ||
2651 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 2652 | u16 cmd_len; |
1da177e4 LT |
2653 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
2654 | data += L2CAP_CMD_HDR_SIZE; | |
2655 | len -= L2CAP_CMD_HDR_SIZE; | |
2656 | ||
88219a0f | 2657 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 2658 | |
88219a0f | 2659 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 2660 | |
88219a0f | 2661 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
2662 | BT_DBG("corrupted command"); |
2663 | break; | |
2664 | } | |
2665 | ||
3300d9a9 CT |
2666 | if (conn->hcon->type == LE_LINK) |
2667 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
2668 | else | |
2669 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
2670 | |
2671 | if (err) { | |
2672 | struct l2cap_cmd_rej rej; | |
2c6d1a2e GP |
2673 | |
2674 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
2675 | |
2676 | /* FIXME: Map err to a valid reason */ | |
aca3192c | 2677 | rej.reason = cpu_to_le16(0); |
1da177e4 LT |
2678 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
2679 | } | |
2680 | ||
88219a0f AV |
2681 | data += cmd_len; |
2682 | len -= cmd_len; | |
1da177e4 LT |
2683 | } |
2684 | ||
2685 | kfree_skb(skb); | |
2686 | } | |
2687 | ||
fcc203c3 GP |
2688 | static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb) |
2689 | { | |
2690 | u16 our_fcs, rcv_fcs; | |
2691 | int hdr_size = L2CAP_HDR_SIZE + 2; | |
2692 | ||
2693 | if (pi->fcs == L2CAP_FCS_CRC16) { | |
2694 | skb_trim(skb, skb->len - 2); | |
2695 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); | |
2696 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
2697 | ||
2698 | if (our_fcs != rcv_fcs) | |
7a560e5c | 2699 | return -EBADMSG; |
fcc203c3 GP |
2700 | } |
2701 | return 0; | |
2702 | } | |
2703 | ||
d5392c8f GP |
2704 | static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk) |
2705 | { | |
2706 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2707 | u16 control = 0; | |
2708 | ||
2709 | pi->frames_sent = 0; | |
d5392c8f GP |
2710 | |
2711 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
2712 | ||
2713 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
64988868 | 2714 | control |= L2CAP_SUPER_RCV_NOT_READY; |
d5392c8f | 2715 | l2cap_send_sframe(pi, control); |
1890d36b | 2716 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
d5392c8f GP |
2717 | } |
2718 | ||
4ea727ef GP |
2719 | if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY) |
2720 | l2cap_retransmit_frames(sk); | |
d5392c8f GP |
2721 | |
2722 | l2cap_ertm_send(sk); | |
2723 | ||
2724 | if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) && | |
2725 | pi->frames_sent == 0) { | |
2726 | control |= L2CAP_SUPER_RCV_READY; | |
d5392c8f GP |
2727 | l2cap_send_sframe(pi, control); |
2728 | } | |
2729 | } | |
2730 | ||
9b53350d | 2731 | static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar) |
8f17154f GP |
2732 | { |
2733 | struct sk_buff *next_skb; | |
bfbacc11 JPRV |
2734 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
2735 | int tx_seq_offset, next_tx_seq_offset; | |
8f17154f GP |
2736 | |
2737 | bt_cb(skb)->tx_seq = tx_seq; | |
2738 | bt_cb(skb)->sar = sar; | |
2739 | ||
2740 | next_skb = skb_peek(SREJ_QUEUE(sk)); | |
2741 | if (!next_skb) { | |
2742 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
9b53350d | 2743 | return 0; |
8f17154f GP |
2744 | } |
2745 | ||
bfbacc11 JPRV |
2746 | tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; |
2747 | if (tx_seq_offset < 0) | |
2748 | tx_seq_offset += 64; | |
2749 | ||
8f17154f | 2750 | do { |
9b53350d JPRV |
2751 | if (bt_cb(next_skb)->tx_seq == tx_seq) |
2752 | return -EINVAL; | |
2753 | ||
bfbacc11 JPRV |
2754 | next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - |
2755 | pi->buffer_seq) % 64; | |
2756 | if (next_tx_seq_offset < 0) | |
2757 | next_tx_seq_offset += 64; | |
2758 | ||
2759 | if (next_tx_seq_offset > tx_seq_offset) { | |
8f17154f | 2760 | __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb); |
9b53350d | 2761 | return 0; |
8f17154f GP |
2762 | } |
2763 | ||
2764 | if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb)) | |
2765 | break; | |
2766 | ||
59203a21 | 2767 | } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb))); |
8f17154f GP |
2768 | |
2769 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
9b53350d JPRV |
2770 | |
2771 | return 0; | |
8f17154f GP |
2772 | } |
2773 | ||
18778a63 GP |
2774 | static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) |
2775 | { | |
2776 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2777 | struct sk_buff *_skb; | |
1890d36b | 2778 | int err; |
18778a63 GP |
2779 | |
2780 | switch (control & L2CAP_CTRL_SAR) { | |
2781 | case L2CAP_SDU_UNSEGMENTED: | |
2782 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) | |
2783 | goto drop; | |
2784 | ||
2785 | err = sock_queue_rcv_skb(sk, skb); | |
2786 | if (!err) | |
2787 | return err; | |
2788 | ||
2789 | break; | |
2790 | ||
2791 | case L2CAP_SDU_START: | |
2792 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) | |
2793 | goto drop; | |
2794 | ||
2795 | pi->sdu_len = get_unaligned_le16(skb->data); | |
18778a63 GP |
2796 | |
2797 | if (pi->sdu_len > pi->imtu) | |
2798 | goto disconnect; | |
2799 | ||
2800 | pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); | |
1890d36b GP |
2801 | if (!pi->sdu) |
2802 | return -ENOMEM; | |
2803 | ||
2804 | /* pull sdu_len bytes only after alloc, because of Local Busy | |
2805 | * condition we have to be sure that this will be executed | |
2806 | * only once, i.e., when alloc does not fail */ | |
2807 | skb_pull(skb, 2); | |
18778a63 GP |
2808 | |
2809 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
2810 | ||
2811 | pi->conn_state |= L2CAP_CONN_SAR_SDU; | |
2812 | pi->partial_sdu_len = skb->len; | |
2813 | break; | |
2814 | ||
2815 | case L2CAP_SDU_CONTINUE: | |
2816 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
2817 | goto disconnect; | |
2818 | ||
2819 | if (!pi->sdu) | |
2820 | goto disconnect; | |
2821 | ||
18778a63 GP |
2822 | pi->partial_sdu_len += skb->len; |
2823 | if (pi->partial_sdu_len > pi->sdu_len) | |
2824 | goto drop; | |
2825 | ||
4178ba46 GP |
2826 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); |
2827 | ||
18778a63 GP |
2828 | break; |
2829 | ||
2830 | case L2CAP_SDU_END: | |
2831 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
2832 | goto disconnect; | |
2833 | ||
2834 | if (!pi->sdu) | |
2835 | goto disconnect; | |
2836 | ||
1890d36b | 2837 | if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) { |
1890d36b | 2838 | pi->partial_sdu_len += skb->len; |
18778a63 | 2839 | |
1890d36b GP |
2840 | if (pi->partial_sdu_len > pi->imtu) |
2841 | goto drop; | |
18778a63 | 2842 | |
1890d36b GP |
2843 | if (pi->partial_sdu_len != pi->sdu_len) |
2844 | goto drop; | |
4178ba46 GP |
2845 | |
2846 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
1890d36b | 2847 | } |
18778a63 GP |
2848 | |
2849 | _skb = skb_clone(pi->sdu, GFP_ATOMIC); | |
1890d36b GP |
2850 | if (!_skb) { |
2851 | pi->conn_state |= L2CAP_CONN_SAR_RETRY; | |
2852 | return -ENOMEM; | |
2853 | } | |
2854 | ||
18778a63 | 2855 | err = sock_queue_rcv_skb(sk, _skb); |
1890d36b | 2856 | if (err < 0) { |
18778a63 | 2857 | kfree_skb(_skb); |
1890d36b GP |
2858 | pi->conn_state |= L2CAP_CONN_SAR_RETRY; |
2859 | return err; | |
2860 | } | |
2861 | ||
2862 | pi->conn_state &= ~L2CAP_CONN_SAR_RETRY; | |
2863 | pi->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
18778a63 GP |
2864 | |
2865 | kfree_skb(pi->sdu); | |
2866 | break; | |
2867 | } | |
2868 | ||
2869 | kfree_skb(skb); | |
1890d36b | 2870 | return 0; |
18778a63 GP |
2871 | |
2872 | drop: | |
2873 | kfree_skb(pi->sdu); | |
2874 | pi->sdu = NULL; | |
2875 | ||
2876 | disconnect: | |
9b108fc0 | 2877 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
18778a63 GP |
2878 | kfree_skb(skb); |
2879 | return 0; | |
2880 | } | |
2881 | ||
712132eb GP |
2882 | static int l2cap_try_push_rx_skb(struct sock *sk) |
2883 | { | |
2884 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2885 | struct sk_buff *skb; | |
2886 | u16 control; | |
2887 | int err; | |
2888 | ||
2889 | while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) { | |
2890 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; | |
2891 | err = l2cap_ertm_reassembly_sdu(sk, skb, control); | |
2892 | if (err < 0) { | |
2893 | skb_queue_head(BUSY_QUEUE(sk), skb); | |
2894 | return -EBUSY; | |
2895 | } | |
2896 | ||
2897 | pi->buffer_seq = (pi->buffer_seq + 1) % 64; | |
2898 | } | |
2899 | ||
2900 | if (!(pi->conn_state & L2CAP_CONN_RNR_SENT)) | |
2901 | goto done; | |
2902 | ||
2903 | control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
2904 | control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; | |
2905 | l2cap_send_sframe(pi, control); | |
2906 | l2cap_pi(sk)->retry_count = 1; | |
2907 | ||
2908 | del_timer(&pi->retrans_timer); | |
2909 | __mod_monitor_timer(); | |
2910 | ||
2911 | l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; | |
2912 | ||
2913 | done: | |
2914 | pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; | |
2915 | pi->conn_state &= ~L2CAP_CONN_RNR_SENT; | |
2916 | ||
2917 | BT_DBG("sk %p, Exit local busy", sk); | |
2918 | ||
2919 | return 0; | |
2920 | } | |
2921 | ||
1890d36b GP |
2922 | static void l2cap_busy_work(struct work_struct *work) |
2923 | { | |
2924 | DECLARE_WAITQUEUE(wait, current); | |
2925 | struct l2cap_pinfo *pi = | |
2926 | container_of(work, struct l2cap_pinfo, busy_work); | |
2927 | struct sock *sk = (struct sock *)pi; | |
2928 | int n_tries = 0, timeo = HZ/5, err; | |
2929 | struct sk_buff *skb; | |
1890d36b GP |
2930 | |
2931 | lock_sock(sk); | |
2932 | ||
2b0b05dd | 2933 | add_wait_queue(sk_sleep(sk), &wait); |
1890d36b GP |
2934 | while ((skb = skb_peek(BUSY_QUEUE(sk)))) { |
2935 | set_current_state(TASK_INTERRUPTIBLE); | |
2936 | ||
2937 | if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { | |
2938 | err = -EBUSY; | |
9b108fc0 | 2939 | l2cap_send_disconn_req(pi->conn, sk, EBUSY); |
712132eb | 2940 | break; |
1890d36b GP |
2941 | } |
2942 | ||
2943 | if (!timeo) | |
2944 | timeo = HZ/5; | |
2945 | ||
2946 | if (signal_pending(current)) { | |
2947 | err = sock_intr_errno(timeo); | |
712132eb | 2948 | break; |
1890d36b GP |
2949 | } |
2950 | ||
2951 | release_sock(sk); | |
2952 | timeo = schedule_timeout(timeo); | |
2953 | lock_sock(sk); | |
2954 | ||
2955 | err = sock_error(sk); | |
2956 | if (err) | |
712132eb | 2957 | break; |
1890d36b | 2958 | |
712132eb | 2959 | if (l2cap_try_push_rx_skb(sk) == 0) |
1890d36b GP |
2960 | break; |
2961 | } | |
2962 | ||
1890d36b | 2963 | set_current_state(TASK_RUNNING); |
2b0b05dd | 2964 | remove_wait_queue(sk_sleep(sk), &wait); |
1890d36b GP |
2965 | |
2966 | release_sock(sk); | |
2967 | } | |
2968 | ||
2969 | static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control) | |
2970 | { | |
2971 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2972 | int sctrl, err; | |
2973 | ||
2974 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
2975 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; | |
2976 | __skb_queue_tail(BUSY_QUEUE(sk), skb); | |
712132eb GP |
2977 | return l2cap_try_push_rx_skb(sk); |
2978 | ||
2979 | ||
1890d36b GP |
2980 | } |
2981 | ||
2982 | err = l2cap_ertm_reassembly_sdu(sk, skb, control); | |
2983 | if (err >= 0) { | |
2984 | pi->buffer_seq = (pi->buffer_seq + 1) % 64; | |
2985 | return err; | |
2986 | } | |
2987 | ||
2988 | /* Busy Condition */ | |
0e98958d GP |
2989 | BT_DBG("sk %p, Enter local busy", sk); |
2990 | ||
1890d36b GP |
2991 | pi->conn_state |= L2CAP_CONN_LOCAL_BUSY; |
2992 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; | |
2993 | __skb_queue_tail(BUSY_QUEUE(sk), skb); | |
2994 | ||
2995 | sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
2996 | sctrl |= L2CAP_SUPER_RCV_NOT_READY; | |
2997 | l2cap_send_sframe(pi, sctrl); | |
2998 | ||
2999 | pi->conn_state |= L2CAP_CONN_RNR_SENT; | |
3000 | ||
7fe9b298 GP |
3001 | del_timer(&pi->ack_timer); |
3002 | ||
1890d36b GP |
3003 | queue_work(_busy_wq, &pi->busy_work); |
3004 | ||
3005 | return err; | |
3006 | } | |
3007 | ||
18778a63 | 3008 | static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) |
c74e560c GP |
3009 | { |
3010 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3011 | struct sk_buff *_skb; | |
3012 | int err = -EINVAL; | |
3013 | ||
18778a63 GP |
3014 | /* |
3015 | * TODO: We have to notify the userland if some data is lost with the | |
3016 | * Streaming Mode. | |
3017 | */ | |
3018 | ||
c74e560c GP |
3019 | switch (control & L2CAP_CTRL_SAR) { |
3020 | case L2CAP_SDU_UNSEGMENTED: | |
3021 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { | |
3022 | kfree_skb(pi->sdu); | |
3023 | break; | |
3024 | } | |
3025 | ||
3026 | err = sock_queue_rcv_skb(sk, skb); | |
3027 | if (!err) | |
3028 | return 0; | |
3029 | ||
3030 | break; | |
3031 | ||
3032 | case L2CAP_SDU_START: | |
3033 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { | |
3034 | kfree_skb(pi->sdu); | |
3035 | break; | |
3036 | } | |
3037 | ||
3038 | pi->sdu_len = get_unaligned_le16(skb->data); | |
3039 | skb_pull(skb, 2); | |
3040 | ||
052897ca GP |
3041 | if (pi->sdu_len > pi->imtu) { |
3042 | err = -EMSGSIZE; | |
3043 | break; | |
3044 | } | |
3045 | ||
c74e560c GP |
3046 | pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); |
3047 | if (!pi->sdu) { | |
3048 | err = -ENOMEM; | |
3049 | break; | |
3050 | } | |
3051 | ||
3052 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3053 | ||
3054 | pi->conn_state |= L2CAP_CONN_SAR_SDU; | |
3055 | pi->partial_sdu_len = skb->len; | |
3056 | err = 0; | |
3057 | break; | |
3058 | ||
3059 | case L2CAP_SDU_CONTINUE: | |
3060 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3061 | break; | |
3062 | ||
3063 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3064 | ||
3065 | pi->partial_sdu_len += skb->len; | |
3066 | if (pi->partial_sdu_len > pi->sdu_len) | |
3067 | kfree_skb(pi->sdu); | |
3068 | else | |
3069 | err = 0; | |
3070 | ||
3071 | break; | |
3072 | ||
3073 | case L2CAP_SDU_END: | |
3074 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3075 | break; | |
3076 | ||
3077 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3078 | ||
3079 | pi->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
3080 | pi->partial_sdu_len += skb->len; | |
3081 | ||
36f2fd58 GP |
3082 | if (pi->partial_sdu_len > pi->imtu) |
3083 | goto drop; | |
3084 | ||
c74e560c GP |
3085 | if (pi->partial_sdu_len == pi->sdu_len) { |
3086 | _skb = skb_clone(pi->sdu, GFP_ATOMIC); | |
3087 | err = sock_queue_rcv_skb(sk, _skb); | |
3088 | if (err < 0) | |
3089 | kfree_skb(_skb); | |
3090 | } | |
c74e560c GP |
3091 | err = 0; |
3092 | ||
36f2fd58 GP |
3093 | drop: |
3094 | kfree_skb(pi->sdu); | |
c74e560c GP |
3095 | break; |
3096 | } | |
3097 | ||
3098 | kfree_skb(skb); | |
3099 | return err; | |
3100 | } | |
3101 | ||
8f17154f GP |
3102 | static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq) |
3103 | { | |
3104 | struct sk_buff *skb; | |
afefdbc4 | 3105 | u16 control; |
8f17154f | 3106 | |
59203a21 | 3107 | while ((skb = skb_peek(SREJ_QUEUE(sk)))) { |
8f17154f GP |
3108 | if (bt_cb(skb)->tx_seq != tx_seq) |
3109 | break; | |
3110 | ||
3111 | skb = skb_dequeue(SREJ_QUEUE(sk)); | |
afefdbc4 | 3112 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
18778a63 | 3113 | l2cap_ertm_reassembly_sdu(sk, skb, control); |
8f17154f GP |
3114 | l2cap_pi(sk)->buffer_seq_srej = |
3115 | (l2cap_pi(sk)->buffer_seq_srej + 1) % 64; | |
8ff50ec0 | 3116 | tx_seq = (tx_seq + 1) % 64; |
8f17154f GP |
3117 | } |
3118 | } | |
3119 | ||
3120 | static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq) | |
3121 | { | |
3122 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3123 | struct srej_list *l, *tmp; | |
3124 | u16 control; | |
3125 | ||
59203a21 | 3126 | list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { |
8f17154f GP |
3127 | if (l->tx_seq == tx_seq) { |
3128 | list_del(&l->list); | |
3129 | kfree(l); | |
3130 | return; | |
3131 | } | |
3132 | control = L2CAP_SUPER_SELECT_REJECT; | |
3133 | control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3134 | l2cap_send_sframe(pi, control); | |
3135 | list_del(&l->list); | |
3136 | list_add_tail(&l->list, SREJ_LIST(sk)); | |
3137 | } | |
3138 | } | |
3139 | ||
3140 | static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq) | |
3141 | { | |
3142 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3143 | struct srej_list *new; | |
3144 | u16 control; | |
3145 | ||
3146 | while (tx_seq != pi->expected_tx_seq) { | |
3147 | control = L2CAP_SUPER_SELECT_REJECT; | |
3148 | control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3149 | l2cap_send_sframe(pi, control); | |
3150 | ||
3151 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
8ff50ec0 GP |
3152 | new->tx_seq = pi->expected_tx_seq; |
3153 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
8f17154f GP |
3154 | list_add_tail(&new->list, SREJ_LIST(sk)); |
3155 | } | |
8ff50ec0 | 3156 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; |
8f17154f GP |
3157 | } |
3158 | ||
1c2acffb GP |
3159 | static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) |
3160 | { | |
3161 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3162 | u8 tx_seq = __get_txseq(rx_control); | |
9f121a5a | 3163 | u8 req_seq = __get_reqseq(rx_control); |
8f17154f | 3164 | u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; |
f6337c77 | 3165 | int tx_seq_offset, expected_tx_seq_offset; |
803020c6 | 3166 | int num_to_ack = (pi->tx_win/6) + 1; |
1c2acffb GP |
3167 | int err = 0; |
3168 | ||
0e98958d GP |
3169 | BT_DBG("sk %p len %d tx_seq %d rx_control 0x%4.4x", sk, skb->len, tx_seq, |
3170 | rx_control); | |
1c2acffb | 3171 | |
9b16dc65 GP |
3172 | if (L2CAP_CTRL_FINAL & rx_control && |
3173 | l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { | |
1d8f5d16 GP |
3174 | del_timer(&pi->monitor_timer); |
3175 | if (pi->unacked_frames > 0) | |
3176 | __mod_retrans_timer(); | |
3177 | pi->conn_state &= ~L2CAP_CONN_WAIT_F; | |
3178 | } | |
3179 | ||
9f121a5a GP |
3180 | pi->expected_ack_seq = req_seq; |
3181 | l2cap_drop_acked_frames(sk); | |
3182 | ||
8f17154f GP |
3183 | if (tx_seq == pi->expected_tx_seq) |
3184 | goto expected; | |
1c2acffb | 3185 | |
9b53350d JPRV |
3186 | tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; |
3187 | if (tx_seq_offset < 0) | |
3188 | tx_seq_offset += 64; | |
3189 | ||
3190 | /* invalid tx_seq */ | |
3191 | if (tx_seq_offset >= pi->tx_win) { | |
9b108fc0 | 3192 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
9b53350d JPRV |
3193 | goto drop; |
3194 | } | |
3195 | ||
1890d36b GP |
3196 | if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY) |
3197 | goto drop; | |
3198 | ||
8f17154f GP |
3199 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
3200 | struct srej_list *first; | |
30afb5b2 | 3201 | |
8f17154f GP |
3202 | first = list_first_entry(SREJ_LIST(sk), |
3203 | struct srej_list, list); | |
3204 | if (tx_seq == first->tx_seq) { | |
3205 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); | |
3206 | l2cap_check_srej_gap(sk, tx_seq); | |
3207 | ||
3208 | list_del(&first->list); | |
3209 | kfree(first); | |
3210 | ||
3211 | if (list_empty(SREJ_LIST(sk))) { | |
3212 | pi->buffer_seq = pi->buffer_seq_srej; | |
3213 | pi->conn_state &= ~L2CAP_CONN_SREJ_SENT; | |
855666cc | 3214 | l2cap_send_ack(pi); |
0e98958d | 3215 | BT_DBG("sk %p, Exit SREJ_SENT", sk); |
8f17154f GP |
3216 | } |
3217 | } else { | |
3218 | struct srej_list *l; | |
9b53350d JPRV |
3219 | |
3220 | /* duplicated tx_seq */ | |
3221 | if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0) | |
3222 | goto drop; | |
8f17154f GP |
3223 | |
3224 | list_for_each_entry(l, SREJ_LIST(sk), list) { | |
3225 | if (l->tx_seq == tx_seq) { | |
3226 | l2cap_resend_srejframe(sk, tx_seq); | |
3227 | return 0; | |
3228 | } | |
3229 | } | |
3230 | l2cap_send_srejframe(sk, tx_seq); | |
30afb5b2 GP |
3231 | } |
3232 | } else { | |
9b53350d JPRV |
3233 | expected_tx_seq_offset = |
3234 | (pi->expected_tx_seq - pi->buffer_seq) % 64; | |
3235 | if (expected_tx_seq_offset < 0) | |
3236 | expected_tx_seq_offset += 64; | |
3237 | ||
3238 | /* duplicated tx_seq */ | |
3239 | if (tx_seq_offset < expected_tx_seq_offset) | |
3240 | goto drop; | |
3241 | ||
8f17154f | 3242 | pi->conn_state |= L2CAP_CONN_SREJ_SENT; |
1c2acffb | 3243 | |
0e98958d GP |
3244 | BT_DBG("sk %p, Enter SREJ", sk); |
3245 | ||
8f17154f GP |
3246 | INIT_LIST_HEAD(SREJ_LIST(sk)); |
3247 | pi->buffer_seq_srej = pi->buffer_seq; | |
3248 | ||
3249 | __skb_queue_head_init(SREJ_QUEUE(sk)); | |
1890d36b | 3250 | __skb_queue_head_init(BUSY_QUEUE(sk)); |
8f17154f GP |
3251 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); |
3252 | ||
ef54fd93 GP |
3253 | pi->conn_state |= L2CAP_CONN_SEND_PBIT; |
3254 | ||
8f17154f | 3255 | l2cap_send_srejframe(sk, tx_seq); |
7fe9b298 GP |
3256 | |
3257 | del_timer(&pi->ack_timer); | |
1c2acffb | 3258 | } |
30afb5b2 GP |
3259 | return 0; |
3260 | ||
8f17154f GP |
3261 | expected: |
3262 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
3263 | ||
3264 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { | |
3b1a9f3f GP |
3265 | bt_cb(skb)->tx_seq = tx_seq; |
3266 | bt_cb(skb)->sar = sar; | |
3267 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
8f17154f GP |
3268 | return 0; |
3269 | } | |
3270 | ||
2ece3684 GP |
3271 | err = l2cap_push_rx_skb(sk, skb, rx_control); |
3272 | if (err < 0) | |
3273 | return 0; | |
3274 | ||
4ec10d97 GP |
3275 | if (rx_control & L2CAP_CTRL_FINAL) { |
3276 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) | |
3277 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
3278 | else |
3279 | l2cap_retransmit_frames(sk); | |
4ec10d97 GP |
3280 | } |
3281 | ||
c1b4f43b GP |
3282 | __mod_ack_timer(); |
3283 | ||
803020c6 GP |
3284 | pi->num_acked = (pi->num_acked + 1) % num_to_ack; |
3285 | if (pi->num_acked == num_to_ack - 1) | |
9e917af1 GP |
3286 | l2cap_send_ack(pi); |
3287 | ||
8f17154f | 3288 | return 0; |
9b53350d JPRV |
3289 | |
3290 | drop: | |
3291 | kfree_skb(skb); | |
3292 | return 0; | |
1c2acffb GP |
3293 | } |
3294 | ||
e072745f | 3295 | static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control) |
1c2acffb GP |
3296 | { |
3297 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
6e3a5981 | 3298 | |
0e98958d GP |
3299 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control), |
3300 | rx_control); | |
3301 | ||
6e3a5981 GP |
3302 | pi->expected_ack_seq = __get_reqseq(rx_control); |
3303 | l2cap_drop_acked_frames(sk); | |
1c2acffb | 3304 | |
e072745f | 3305 | if (rx_control & L2CAP_CTRL_POLL) { |
3cb123d1 | 3306 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; |
05fbd89d GP |
3307 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
3308 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && | |
3309 | (pi->unacked_frames > 0)) | |
3310 | __mod_retrans_timer(); | |
3311 | ||
3312 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
3313 | l2cap_send_srejtail(sk); | |
3314 | } else { | |
3315 | l2cap_send_i_or_rr_or_rnr(sk); | |
05fbd89d | 3316 | } |
1d8f5d16 | 3317 | |
e072745f GP |
3318 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
3319 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
4ec10d97 | 3320 | |
e072745f GP |
3321 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) |
3322 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
3323 | else |
3324 | l2cap_retransmit_frames(sk); | |
2246b2f1 | 3325 | |
e072745f | 3326 | } else { |
e072745f GP |
3327 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && |
3328 | (pi->unacked_frames > 0)) | |
3329 | __mod_retrans_timer(); | |
1c2acffb | 3330 | |
2246b2f1 | 3331 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
894718a6 | 3332 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) |
e072745f | 3333 | l2cap_send_ack(pi); |
894718a6 | 3334 | else |
e072745f GP |
3335 | l2cap_ertm_send(sk); |
3336 | } | |
3337 | } | |
2246b2f1 | 3338 | |
e072745f GP |
3339 | static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control) |
3340 | { | |
3341 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3342 | u8 tx_seq = __get_reqseq(rx_control); | |
30afb5b2 | 3343 | |
0e98958d GP |
3344 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); |
3345 | ||
e072745f GP |
3346 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3347 | ||
8abb52ee | 3348 | pi->expected_ack_seq = tx_seq; |
e072745f GP |
3349 | l2cap_drop_acked_frames(sk); |
3350 | ||
3351 | if (rx_control & L2CAP_CTRL_FINAL) { | |
3352 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) | |
3353 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
3354 | else |
3355 | l2cap_retransmit_frames(sk); | |
e072745f | 3356 | } else { |
dfc909be | 3357 | l2cap_retransmit_frames(sk); |
30afb5b2 | 3358 | |
0301ef04 | 3359 | if (pi->conn_state & L2CAP_CONN_WAIT_F) |
e072745f | 3360 | pi->conn_state |= L2CAP_CONN_REJ_ACT; |
e072745f GP |
3361 | } |
3362 | } | |
3363 | static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control) | |
3364 | { | |
3365 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3366 | u8 tx_seq = __get_reqseq(rx_control); | |
30afb5b2 | 3367 | |
0e98958d GP |
3368 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); |
3369 | ||
e072745f | 3370 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
2246b2f1 | 3371 | |
e072745f GP |
3372 | if (rx_control & L2CAP_CTRL_POLL) { |
3373 | pi->expected_ack_seq = tx_seq; | |
3374 | l2cap_drop_acked_frames(sk); | |
3cb123d1 GP |
3375 | |
3376 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; | |
dfc909be GP |
3377 | l2cap_retransmit_one_frame(sk, tx_seq); |
3378 | ||
e072745f | 3379 | l2cap_ertm_send(sk); |
dfc909be | 3380 | |
e072745f GP |
3381 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { |
3382 | pi->srej_save_reqseq = tx_seq; | |
3383 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; | |
ef54fd93 | 3384 | } |
e072745f GP |
3385 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
3386 | if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) && | |
3387 | pi->srej_save_reqseq == tx_seq) | |
3388 | pi->conn_state &= ~L2CAP_CONN_SREJ_ACT; | |
3389 | else | |
dfc909be | 3390 | l2cap_retransmit_one_frame(sk, tx_seq); |
e072745f | 3391 | } else { |
dfc909be | 3392 | l2cap_retransmit_one_frame(sk, tx_seq); |
e072745f GP |
3393 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { |
3394 | pi->srej_save_reqseq = tx_seq; | |
3395 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; | |
ef54fd93 | 3396 | } |
e072745f GP |
3397 | } |
3398 | } | |
3399 | ||
3400 | static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control) | |
3401 | { | |
3402 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3403 | u8 tx_seq = __get_reqseq(rx_control); | |
3404 | ||
0e98958d GP |
3405 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); |
3406 | ||
e072745f GP |
3407 | pi->conn_state |= L2CAP_CONN_REMOTE_BUSY; |
3408 | pi->expected_ack_seq = tx_seq; | |
3409 | l2cap_drop_acked_frames(sk); | |
3410 | ||
3cb123d1 GP |
3411 | if (rx_control & L2CAP_CTRL_POLL) |
3412 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; | |
3413 | ||
99b0d4b7 GP |
3414 | if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) { |
3415 | del_timer(&pi->retrans_timer); | |
a2e12a2a GP |
3416 | if (rx_control & L2CAP_CTRL_POLL) |
3417 | l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL); | |
99b0d4b7 | 3418 | return; |
e072745f | 3419 | } |
99b0d4b7 GP |
3420 | |
3421 | if (rx_control & L2CAP_CTRL_POLL) | |
3422 | l2cap_send_srejtail(sk); | |
3423 | else | |
3424 | l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY); | |
e072745f GP |
3425 | } |
3426 | ||
3427 | static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) | |
3428 | { | |
3429 | BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len); | |
3430 | ||
9b16dc65 GP |
3431 | if (L2CAP_CTRL_FINAL & rx_control && |
3432 | l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { | |
e072745f GP |
3433 | del_timer(&l2cap_pi(sk)->monitor_timer); |
3434 | if (l2cap_pi(sk)->unacked_frames > 0) | |
3435 | __mod_retrans_timer(); | |
3436 | l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F; | |
3437 | } | |
3438 | ||
3439 | switch (rx_control & L2CAP_CTRL_SUPERVISE) { | |
3440 | case L2CAP_SUPER_RCV_READY: | |
3441 | l2cap_data_channel_rrframe(sk, rx_control); | |
8f17154f GP |
3442 | break; |
3443 | ||
e072745f GP |
3444 | case L2CAP_SUPER_REJECT: |
3445 | l2cap_data_channel_rejframe(sk, rx_control); | |
3446 | break; | |
2246b2f1 | 3447 | |
e072745f GP |
3448 | case L2CAP_SUPER_SELECT_REJECT: |
3449 | l2cap_data_channel_srejframe(sk, rx_control); | |
3450 | break; | |
3451 | ||
3452 | case L2CAP_SUPER_RCV_NOT_READY: | |
3453 | l2cap_data_channel_rnrframe(sk, rx_control); | |
1c2acffb GP |
3454 | break; |
3455 | } | |
3456 | ||
faaebd19 | 3457 | kfree_skb(skb); |
1c2acffb GP |
3458 | return 0; |
3459 | } | |
3460 | ||
218bb9df GP |
3461 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) |
3462 | { | |
3463 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3464 | u16 control; | |
3465 | u8 req_seq; | |
3466 | int len, next_tx_seq_offset, req_seq_offset; | |
3467 | ||
3468 | control = get_unaligned_le16(skb->data); | |
3469 | skb_pull(skb, 2); | |
3470 | len = skb->len; | |
3471 | ||
3472 | /* | |
3473 | * We can just drop the corrupted I-frame here. | |
3474 | * Receiver will miss it and start proper recovery | |
3475 | * procedures and ask retransmission. | |
3476 | */ | |
3477 | if (l2cap_check_fcs(pi, skb)) | |
3478 | goto drop; | |
3479 | ||
3480 | if (__is_sar_start(control) && __is_iframe(control)) | |
3481 | len -= 2; | |
3482 | ||
3483 | if (pi->fcs == L2CAP_FCS_CRC16) | |
3484 | len -= 2; | |
3485 | ||
3486 | if (len > pi->mps) { | |
3487 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); | |
3488 | goto drop; | |
3489 | } | |
3490 | ||
3491 | req_seq = __get_reqseq(control); | |
3492 | req_seq_offset = (req_seq - pi->expected_ack_seq) % 64; | |
3493 | if (req_seq_offset < 0) | |
3494 | req_seq_offset += 64; | |
3495 | ||
3496 | next_tx_seq_offset = | |
3497 | (pi->next_tx_seq - pi->expected_ack_seq) % 64; | |
3498 | if (next_tx_seq_offset < 0) | |
3499 | next_tx_seq_offset += 64; | |
3500 | ||
3501 | /* check for invalid req-seq */ | |
3502 | if (req_seq_offset > next_tx_seq_offset) { | |
3503 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); | |
3504 | goto drop; | |
3505 | } | |
3506 | ||
3507 | if (__is_iframe(control)) { | |
3508 | if (len < 0) { | |
3509 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); | |
3510 | goto drop; | |
3511 | } | |
3512 | ||
3513 | l2cap_data_channel_iframe(sk, control, skb); | |
3514 | } else { | |
3515 | if (len != 0) { | |
3516 | BT_ERR("%d", len); | |
3517 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); | |
3518 | goto drop; | |
3519 | } | |
3520 | ||
3521 | l2cap_data_channel_sframe(sk, control, skb); | |
3522 | } | |
3523 | ||
3524 | return 0; | |
3525 | ||
3526 | drop: | |
3527 | kfree_skb(skb); | |
3528 | return 0; | |
3529 | } | |
3530 | ||
1da177e4 LT |
3531 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
3532 | { | |
3533 | struct sock *sk; | |
6840ed07 | 3534 | struct l2cap_pinfo *pi; |
51893f88 | 3535 | u16 control; |
218bb9df GP |
3536 | u8 tx_seq; |
3537 | int len; | |
1da177e4 LT |
3538 | |
3539 | sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); | |
3540 | if (!sk) { | |
3541 | BT_DBG("unknown cid 0x%4.4x", cid); | |
3542 | goto drop; | |
3543 | } | |
3544 | ||
6840ed07 GP |
3545 | pi = l2cap_pi(sk); |
3546 | ||
1da177e4 LT |
3547 | BT_DBG("sk %p, len %d", sk, skb->len); |
3548 | ||
3549 | if (sk->sk_state != BT_CONNECTED) | |
3550 | goto drop; | |
3551 | ||
6840ed07 | 3552 | switch (pi->mode) { |
1c2acffb GP |
3553 | case L2CAP_MODE_BASIC: |
3554 | /* If socket recv buffers overflows we drop data here | |
3555 | * which is *bad* because L2CAP has to be reliable. | |
3556 | * But we don't have any other choice. L2CAP doesn't | |
3557 | * provide flow control mechanism. */ | |
1da177e4 | 3558 | |
6840ed07 | 3559 | if (pi->imtu < skb->len) |
1c2acffb | 3560 | goto drop; |
1da177e4 | 3561 | |
1c2acffb GP |
3562 | if (!sock_queue_rcv_skb(sk, skb)) |
3563 | goto done; | |
3564 | break; | |
3565 | ||
3566 | case L2CAP_MODE_ERTM: | |
218bb9df GP |
3567 | if (!sock_owned_by_user(sk)) { |
3568 | l2cap_ertm_data_rcv(sk, skb); | |
277ffbe3 | 3569 | } else { |
218bb9df | 3570 | if (sk_add_backlog(sk, skb)) |
277ffbe3 | 3571 | goto drop; |
277ffbe3 | 3572 | } |
1c2acffb | 3573 | |
fcafde2e | 3574 | goto done; |
1c2acffb | 3575 | |
6840ed07 GP |
3576 | case L2CAP_MODE_STREAMING: |
3577 | control = get_unaligned_le16(skb->data); | |
3578 | skb_pull(skb, 2); | |
3579 | len = skb->len; | |
3580 | ||
26000089 GP |
3581 | if (l2cap_check_fcs(pi, skb)) |
3582 | goto drop; | |
3583 | ||
6840ed07 GP |
3584 | if (__is_sar_start(control)) |
3585 | len -= 2; | |
3586 | ||
fcc203c3 GP |
3587 | if (pi->fcs == L2CAP_FCS_CRC16) |
3588 | len -= 2; | |
3589 | ||
51893f88 | 3590 | if (len > pi->mps || len < 0 || __is_sframe(control)) |
6840ed07 GP |
3591 | goto drop; |
3592 | ||
3593 | tx_seq = __get_txseq(control); | |
3594 | ||
3595 | if (pi->expected_tx_seq == tx_seq) | |
3596 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
3597 | else | |
7dffe421 | 3598 | pi->expected_tx_seq = (tx_seq + 1) % 64; |
6840ed07 | 3599 | |
18778a63 | 3600 | l2cap_streaming_reassembly_sdu(sk, skb, control); |
6840ed07 GP |
3601 | |
3602 | goto done; | |
3603 | ||
1c2acffb | 3604 | default: |
e8235c6b | 3605 | BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode); |
1c2acffb GP |
3606 | break; |
3607 | } | |
1da177e4 LT |
3608 | |
3609 | drop: | |
3610 | kfree_skb(skb); | |
3611 | ||
3612 | done: | |
0139418c MH |
3613 | if (sk) |
3614 | bh_unlock_sock(sk); | |
3615 | ||
1da177e4 LT |
3616 | return 0; |
3617 | } | |
3618 | ||
8e036fc3 | 3619 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 LT |
3620 | { |
3621 | struct sock *sk; | |
3622 | ||
3623 | sk = l2cap_get_sock_by_psm(0, psm, conn->src); | |
3624 | if (!sk) | |
3625 | goto drop; | |
3626 | ||
e0f0cb56 GP |
3627 | bh_lock_sock(sk); |
3628 | ||
1da177e4 LT |
3629 | BT_DBG("sk %p, len %d", sk, skb->len); |
3630 | ||
3631 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) | |
3632 | goto drop; | |
3633 | ||
3634 | if (l2cap_pi(sk)->imtu < skb->len) | |
3635 | goto drop; | |
3636 | ||
3637 | if (!sock_queue_rcv_skb(sk, skb)) | |
3638 | goto done; | |
3639 | ||
3640 | drop: | |
3641 | kfree_skb(skb); | |
3642 | ||
3643 | done: | |
af05b30b GP |
3644 | if (sk) |
3645 | bh_unlock_sock(sk); | |
1da177e4 LT |
3646 | return 0; |
3647 | } | |
3648 | ||
3649 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) | |
3650 | { | |
3651 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
3652 | u16 cid, len; |
3653 | __le16 psm; | |
1da177e4 LT |
3654 | |
3655 | skb_pull(skb, L2CAP_HDR_SIZE); | |
3656 | cid = __le16_to_cpu(lh->cid); | |
3657 | len = __le16_to_cpu(lh->len); | |
3658 | ||
1c2acffb GP |
3659 | if (len != skb->len) { |
3660 | kfree_skb(skb); | |
3661 | return; | |
3662 | } | |
3663 | ||
1da177e4 LT |
3664 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
3665 | ||
3666 | switch (cid) { | |
3300d9a9 | 3667 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 3668 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
3669 | l2cap_sig_channel(conn, skb); |
3670 | break; | |
3671 | ||
8db4dc46 | 3672 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 3673 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
3674 | skb_pull(skb, 2); |
3675 | l2cap_conless_channel(conn, psm, skb); | |
3676 | break; | |
3677 | ||
3678 | default: | |
3679 | l2cap_data_channel(conn, cid, skb); | |
3680 | break; | |
3681 | } | |
3682 | } | |
3683 | ||
3684 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
3685 | ||
3686 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
3687 | { | |
3688 | int exact = 0, lm1 = 0, lm2 = 0; | |
3689 | register struct sock *sk; | |
3690 | struct hlist_node *node; | |
3691 | ||
3692 | if (type != ACL_LINK) | |
963cf687 | 3693 | return -EINVAL; |
1da177e4 LT |
3694 | |
3695 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
3696 | ||
3697 | /* Find listening sockets and check their link_mode */ | |
3698 | read_lock(&l2cap_sk_list.lock); | |
3699 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
3700 | if (sk->sk_state != BT_LISTEN) | |
3701 | continue; | |
3702 | ||
3703 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 MH |
3704 | lm1 |= HCI_LM_ACCEPT; |
3705 | if (l2cap_pi(sk)->role_switch) | |
3706 | lm1 |= HCI_LM_MASTER; | |
1da177e4 | 3707 | exact++; |
2af6b9d5 MH |
3708 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
3709 | lm2 |= HCI_LM_ACCEPT; | |
3710 | if (l2cap_pi(sk)->role_switch) | |
3711 | lm2 |= HCI_LM_MASTER; | |
3712 | } | |
1da177e4 LT |
3713 | } |
3714 | read_unlock(&l2cap_sk_list.lock); | |
3715 | ||
3716 | return exact ? lm1 : lm2; | |
3717 | } | |
3718 | ||
3719 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
3720 | { | |
0139418c MH |
3721 | struct l2cap_conn *conn; |
3722 | ||
1da177e4 LT |
3723 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
3724 | ||
acd7d370 | 3725 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 3726 | return -EINVAL; |
1da177e4 LT |
3727 | |
3728 | if (!status) { | |
1da177e4 LT |
3729 | conn = l2cap_conn_add(hcon, status); |
3730 | if (conn) | |
3731 | l2cap_conn_ready(conn); | |
0139418c | 3732 | } else |
1da177e4 LT |
3733 | l2cap_conn_del(hcon, bt_err(status)); |
3734 | ||
3735 | return 0; | |
3736 | } | |
3737 | ||
2950f21a MH |
3738 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
3739 | { | |
3740 | struct l2cap_conn *conn = hcon->l2cap_data; | |
3741 | ||
3742 | BT_DBG("hcon %p", hcon); | |
3743 | ||
3744 | if (hcon->type != ACL_LINK || !conn) | |
3745 | return 0x13; | |
3746 | ||
3747 | return conn->disc_reason; | |
3748 | } | |
3749 | ||
3750 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
3751 | { |
3752 | BT_DBG("hcon %p reason %d", hcon, reason); | |
3753 | ||
acd7d370 | 3754 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 3755 | return -EINVAL; |
1da177e4 LT |
3756 | |
3757 | l2cap_conn_del(hcon, bt_err(reason)); | |
0139418c | 3758 | |
1da177e4 LT |
3759 | return 0; |
3760 | } | |
3761 | ||
f62e4323 MH |
3762 | static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) |
3763 | { | |
bd3c9e25 | 3764 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) |
255c7601 MH |
3765 | return; |
3766 | ||
f62e4323 MH |
3767 | if (encrypt == 0x00) { |
3768 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { | |
3769 | l2cap_sock_clear_timer(sk); | |
3770 | l2cap_sock_set_timer(sk, HZ * 5); | |
3771 | } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) | |
3772 | __l2cap_sock_close(sk, ECONNREFUSED); | |
3773 | } else { | |
3774 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) | |
3775 | l2cap_sock_clear_timer(sk); | |
3776 | } | |
3777 | } | |
3778 | ||
8c1b2355 | 3779 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 LT |
3780 | { |
3781 | struct l2cap_chan_list *l; | |
0139418c | 3782 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 3783 | struct sock *sk; |
1da177e4 | 3784 | |
0139418c | 3785 | if (!conn) |
1da177e4 | 3786 | return 0; |
0139418c | 3787 | |
1da177e4 LT |
3788 | l = &conn->chan_list; |
3789 | ||
3790 | BT_DBG("conn %p", conn); | |
3791 | ||
3792 | read_lock(&l->lock); | |
3793 | ||
3794 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
3795 | bh_lock_sock(sk); | |
3796 | ||
6a8d3010 MH |
3797 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) { |
3798 | bh_unlock_sock(sk); | |
3799 | continue; | |
3800 | } | |
3801 | ||
f62e4323 | 3802 | if (!status && (sk->sk_state == BT_CONNECTED || |
8c1b2355 | 3803 | sk->sk_state == BT_CONFIG)) { |
f62e4323 | 3804 | l2cap_check_encryption(sk, encrypt); |
9719f8af MH |
3805 | bh_unlock_sock(sk); |
3806 | continue; | |
3807 | } | |
3808 | ||
b1235d79 MH |
3809 | if (sk->sk_state == BT_CONNECT) { |
3810 | if (!status) { | |
3811 | struct l2cap_conn_req req; | |
3812 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
3813 | req.psm = l2cap_pi(sk)->psm; | |
1da177e4 | 3814 | |
b1235d79 | 3815 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
e501d055 | 3816 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 | 3817 | |
b1235d79 MH |
3818 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
3819 | L2CAP_CONN_REQ, sizeof(req), &req); | |
3820 | } else { | |
3821 | l2cap_sock_clear_timer(sk); | |
3822 | l2cap_sock_set_timer(sk, HZ / 10); | |
3823 | } | |
3824 | } else if (sk->sk_state == BT_CONNECT2) { | |
3825 | struct l2cap_conn_rsp rsp; | |
3826 | __u16 result; | |
1da177e4 | 3827 | |
b1235d79 MH |
3828 | if (!status) { |
3829 | sk->sk_state = BT_CONFIG; | |
3830 | result = L2CAP_CR_SUCCESS; | |
3831 | } else { | |
3832 | sk->sk_state = BT_DISCONN; | |
3833 | l2cap_sock_set_timer(sk, HZ / 10); | |
3834 | result = L2CAP_CR_SEC_BLOCK; | |
3835 | } | |
3836 | ||
3837 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
3838 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
3839 | rsp.result = cpu_to_le16(result); | |
e7c29cb1 | 3840 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
b1235d79 MH |
3841 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
3842 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
3843 | } | |
1da177e4 LT |
3844 | |
3845 | bh_unlock_sock(sk); | |
3846 | } | |
3847 | ||
3848 | read_unlock(&l->lock); | |
b1235d79 | 3849 | |
1da177e4 LT |
3850 | return 0; |
3851 | } | |
3852 | ||
3853 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
3854 | { | |
3855 | struct l2cap_conn *conn = hcon->l2cap_data; | |
3856 | ||
5a08ecce AE |
3857 | if (!conn) |
3858 | conn = l2cap_conn_add(hcon, 0); | |
3859 | ||
3860 | if (!conn) | |
1da177e4 LT |
3861 | goto drop; |
3862 | ||
3863 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
3864 | ||
e702112f | 3865 | if (!(flags & ACL_CONT)) { |
1da177e4 | 3866 | struct l2cap_hdr *hdr; |
89794813 AE |
3867 | struct sock *sk; |
3868 | u16 cid; | |
1da177e4 LT |
3869 | int len; |
3870 | ||
3871 | if (conn->rx_len) { | |
3872 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
3873 | kfree_skb(conn->rx_skb); | |
3874 | conn->rx_skb = NULL; | |
3875 | conn->rx_len = 0; | |
3876 | l2cap_conn_unreliable(conn, ECOMM); | |
3877 | } | |
3878 | ||
aae7fe22 AE |
3879 | /* Start fragment always begin with Basic L2CAP header */ |
3880 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
3881 | BT_ERR("Frame is too short (len %d)", skb->len); |
3882 | l2cap_conn_unreliable(conn, ECOMM); | |
3883 | goto drop; | |
3884 | } | |
3885 | ||
3886 | hdr = (struct l2cap_hdr *) skb->data; | |
3887 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
89794813 | 3888 | cid = __le16_to_cpu(hdr->cid); |
1da177e4 LT |
3889 | |
3890 | if (len == skb->len) { | |
3891 | /* Complete frame received */ | |
3892 | l2cap_recv_frame(conn, skb); | |
3893 | return 0; | |
3894 | } | |
3895 | ||
3896 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
3897 | ||
3898 | if (skb->len > len) { | |
3899 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
3900 | skb->len, len); | |
3901 | l2cap_conn_unreliable(conn, ECOMM); | |
3902 | goto drop; | |
3903 | } | |
3904 | ||
89794813 AE |
3905 | sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); |
3906 | ||
3907 | if (sk && l2cap_pi(sk)->imtu < len - L2CAP_HDR_SIZE) { | |
3908 | BT_ERR("Frame exceeding recv MTU (len %d, MTU %d)", | |
3909 | len, l2cap_pi(sk)->imtu); | |
3910 | bh_unlock_sock(sk); | |
3911 | l2cap_conn_unreliable(conn, ECOMM); | |
3912 | goto drop; | |
3913 | } | |
3914 | ||
3915 | if (sk) | |
3916 | bh_unlock_sock(sk); | |
3917 | ||
1da177e4 | 3918 | /* Allocate skb for the complete frame (with header) */ |
af05b30b GP |
3919 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
3920 | if (!conn->rx_skb) | |
1da177e4 LT |
3921 | goto drop; |
3922 | ||
d626f62b | 3923 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 3924 | skb->len); |
1da177e4 LT |
3925 | conn->rx_len = len - skb->len; |
3926 | } else { | |
3927 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
3928 | ||
3929 | if (!conn->rx_len) { | |
3930 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
3931 | l2cap_conn_unreliable(conn, ECOMM); | |
3932 | goto drop; | |
3933 | } | |
3934 | ||
3935 | if (skb->len > conn->rx_len) { | |
3936 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
3937 | skb->len, conn->rx_len); | |
3938 | kfree_skb(conn->rx_skb); | |
3939 | conn->rx_skb = NULL; | |
3940 | conn->rx_len = 0; | |
3941 | l2cap_conn_unreliable(conn, ECOMM); | |
3942 | goto drop; | |
3943 | } | |
3944 | ||
d626f62b | 3945 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 3946 | skb->len); |
1da177e4 LT |
3947 | conn->rx_len -= skb->len; |
3948 | ||
3949 | if (!conn->rx_len) { | |
3950 | /* Complete frame received */ | |
3951 | l2cap_recv_frame(conn, conn->rx_skb); | |
3952 | conn->rx_skb = NULL; | |
3953 | } | |
3954 | } | |
3955 | ||
3956 | drop: | |
3957 | kfree_skb(skb); | |
3958 | return 0; | |
3959 | } | |
3960 | ||
aef7d97c | 3961 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 LT |
3962 | { |
3963 | struct sock *sk; | |
3964 | struct hlist_node *node; | |
1da177e4 LT |
3965 | |
3966 | read_lock_bh(&l2cap_sk_list.lock); | |
3967 | ||
be9d1227 MH |
3968 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
3969 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
101545f6 | 3970 | |
903d343e | 3971 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
3972 | batostr(&bt_sk(sk)->src), |
3973 | batostr(&bt_sk(sk)->dst), | |
3974 | sk->sk_state, __le16_to_cpu(pi->psm), | |
3975 | pi->scid, pi->dcid, | |
903d343e GP |
3976 | pi->imtu, pi->omtu, pi->sec_level, |
3977 | pi->mode); | |
be9d1227 | 3978 | } |
1da177e4 | 3979 | |
1da177e4 | 3980 | read_unlock_bh(&l2cap_sk_list.lock); |
1da177e4 | 3981 | |
aef7d97c | 3982 | return 0; |
1da177e4 LT |
3983 | } |
3984 | ||
aef7d97c MH |
3985 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
3986 | { | |
3987 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
3988 | } | |
3989 | ||
3990 | static const struct file_operations l2cap_debugfs_fops = { | |
3991 | .open = l2cap_debugfs_open, | |
3992 | .read = seq_read, | |
3993 | .llseek = seq_lseek, | |
3994 | .release = single_release, | |
3995 | }; | |
3996 | ||
3997 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 3998 | |
1da177e4 LT |
3999 | static struct hci_proto l2cap_hci_proto = { |
4000 | .name = "L2CAP", | |
4001 | .id = HCI_PROTO_L2CAP, | |
4002 | .connect_ind = l2cap_connect_ind, | |
4003 | .connect_cfm = l2cap_connect_cfm, | |
4004 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4005 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4006 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4007 | .recv_acldata = l2cap_recv_acldata |
4008 | }; | |
4009 | ||
64274518 | 4010 | int __init l2cap_init(void) |
1da177e4 LT |
4011 | { |
4012 | int err; | |
be9d1227 | 4013 | |
bb58f747 | 4014 | err = l2cap_init_sockets(); |
1da177e4 LT |
4015 | if (err < 0) |
4016 | return err; | |
4017 | ||
1890d36b | 4018 | _busy_wq = create_singlethread_workqueue("l2cap"); |
b78d7b4f | 4019 | if (!_busy_wq) { |
bb58f747 | 4020 | err = -ENOMEM; |
1da177e4 LT |
4021 | goto error; |
4022 | } | |
4023 | ||
4024 | err = hci_register_proto(&l2cap_hci_proto); | |
4025 | if (err < 0) { | |
4026 | BT_ERR("L2CAP protocol registration failed"); | |
4027 | bt_sock_unregister(BTPROTO_L2CAP); | |
4028 | goto error; | |
4029 | } | |
4030 | ||
aef7d97c MH |
4031 | if (bt_debugfs) { |
4032 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4033 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4034 | if (!l2cap_debugfs) | |
4035 | BT_ERR("Failed to create L2CAP debug file"); | |
4036 | } | |
1da177e4 | 4037 | |
1da177e4 LT |
4038 | return 0; |
4039 | ||
4040 | error: | |
b78d7b4f | 4041 | destroy_workqueue(_busy_wq); |
bb58f747 | 4042 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4043 | return err; |
4044 | } | |
4045 | ||
64274518 | 4046 | void l2cap_exit(void) |
1da177e4 | 4047 | { |
aef7d97c | 4048 | debugfs_remove(l2cap_debugfs); |
1da177e4 | 4049 | |
1890d36b GP |
4050 | flush_workqueue(_busy_wq); |
4051 | destroy_workqueue(_busy_wq); | |
4052 | ||
1da177e4 LT |
4053 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) |
4054 | BT_ERR("L2CAP protocol unregistration failed"); | |
4055 | ||
bb58f747 | 4056 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4057 | } |
4058 | ||
d1c4a17d GP |
4059 | module_param(disable_ertm, bool, 0644); |
4060 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |