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); | |
710f9b0a | 73 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
1da177e4 | 74 | |
218bb9df GP |
75 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); |
76 | ||
0139418c | 77 | /* ---- L2CAP channels ---- */ |
baa7e1fa | 78 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) |
0139418c | 79 | { |
48454079 | 80 | struct l2cap_chan *c; |
baa7e1fa GP |
81 | |
82 | list_for_each_entry(c, &conn->chan_l, list) { | |
83 | struct sock *s = c->sk; | |
84 | if (l2cap_pi(s)->dcid == cid) | |
85 | return c; | |
0139418c | 86 | } |
baa7e1fa GP |
87 | return NULL; |
88 | ||
0139418c MH |
89 | } |
90 | ||
baa7e1fa | 91 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 92 | { |
48454079 | 93 | struct l2cap_chan *c; |
baa7e1fa GP |
94 | |
95 | list_for_each_entry(c, &conn->chan_l, list) { | |
96 | struct sock *s = c->sk; | |
97 | if (l2cap_pi(s)->scid == cid) | |
98 | return c; | |
0139418c | 99 | } |
baa7e1fa | 100 | return NULL; |
0139418c MH |
101 | } |
102 | ||
103 | /* Find channel with given SCID. | |
104 | * Returns locked socket */ | |
baa7e1fa | 105 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 106 | { |
48454079 | 107 | struct l2cap_chan *c; |
baa7e1fa GP |
108 | |
109 | read_lock(&conn->chan_lock); | |
110 | c = __l2cap_get_chan_by_scid(conn, cid); | |
48454079 GP |
111 | if (c) |
112 | bh_lock_sock(c->sk); | |
baa7e1fa | 113 | read_unlock(&conn->chan_lock); |
48454079 | 114 | return c; |
0139418c MH |
115 | } |
116 | ||
baa7e1fa | 117 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 118 | { |
48454079 | 119 | struct l2cap_chan *c; |
baa7e1fa GP |
120 | |
121 | list_for_each_entry(c, &conn->chan_l, list) { | |
fc7f8a7e | 122 | if (c->ident == ident) |
baa7e1fa | 123 | return c; |
0139418c | 124 | } |
baa7e1fa | 125 | return NULL; |
0139418c MH |
126 | } |
127 | ||
baa7e1fa | 128 | static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 129 | { |
48454079 | 130 | struct l2cap_chan *c; |
baa7e1fa GP |
131 | |
132 | read_lock(&conn->chan_lock); | |
133 | c = __l2cap_get_chan_by_ident(conn, ident); | |
48454079 GP |
134 | if (c) |
135 | bh_lock_sock(c->sk); | |
baa7e1fa | 136 | read_unlock(&conn->chan_lock); |
48454079 | 137 | return c; |
0139418c MH |
138 | } |
139 | ||
baa7e1fa | 140 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 141 | { |
8db4dc46 | 142 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 143 | |
8db4dc46 | 144 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 145 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
146 | return cid; |
147 | } | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
48454079 GP |
152 | static struct l2cap_chan *l2cap_chan_alloc(struct sock *sk) |
153 | { | |
154 | struct l2cap_chan *chan; | |
155 | ||
156 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
157 | if (!chan) | |
158 | return NULL; | |
159 | ||
160 | chan->sk = sk; | |
161 | ||
162 | return chan; | |
163 | } | |
164 | ||
48454079 | 165 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 166 | { |
48454079 | 167 | struct sock *sk = chan->sk; |
0139418c | 168 | |
af05b30b GP |
169 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
170 | l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid); | |
0139418c | 171 | |
2950f21a MH |
172 | conn->disc_reason = 0x13; |
173 | ||
0139418c MH |
174 | l2cap_pi(sk)->conn = conn; |
175 | ||
bd3c9e25 | 176 | if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) { |
b62f328b VT |
177 | if (conn->hcon->type == LE_LINK) { |
178 | /* LE connection */ | |
179 | l2cap_pi(sk)->omtu = L2CAP_LE_DEFAULT_MTU; | |
180 | l2cap_pi(sk)->scid = L2CAP_CID_LE_DATA; | |
181 | l2cap_pi(sk)->dcid = L2CAP_CID_LE_DATA; | |
182 | } else { | |
183 | /* Alloc CID for connection-oriented socket */ | |
baa7e1fa | 184 | l2cap_pi(sk)->scid = l2cap_alloc_cid(conn); |
b62f328b VT |
185 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
186 | } | |
0139418c MH |
187 | } else if (sk->sk_type == SOCK_DGRAM) { |
188 | /* Connectionless socket */ | |
8db4dc46 GP |
189 | l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS; |
190 | l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS; | |
0139418c MH |
191 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
192 | } else { | |
193 | /* Raw socket can send/recv signalling messages only */ | |
8db4dc46 GP |
194 | l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING; |
195 | l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING; | |
0139418c MH |
196 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
197 | } | |
198 | ||
baa7e1fa GP |
199 | sock_hold(sk); |
200 | ||
201 | list_add(&chan->list, &conn->chan_l); | |
0139418c MH |
202 | } |
203 | ||
8e87d142 | 204 | /* Delete channel. |
0139418c | 205 | * Must be called on the locked socket. */ |
48454079 | 206 | void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 207 | { |
48454079 | 208 | struct sock *sk = chan->sk; |
0139418c MH |
209 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
210 | struct sock *parent = bt_sk(sk)->parent; | |
211 | ||
212 | l2cap_sock_clear_timer(sk); | |
213 | ||
49208c9c | 214 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 215 | |
8e87d142 | 216 | if (conn) { |
baa7e1fa GP |
217 | /* Delete from channel list */ |
218 | write_lock_bh(&conn->chan_lock); | |
219 | list_del(&chan->list); | |
220 | write_unlock_bh(&conn->chan_lock); | |
221 | __sock_put(sk); | |
222 | ||
0139418c MH |
223 | l2cap_pi(sk)->conn = NULL; |
224 | hci_conn_put(conn->hcon); | |
225 | } | |
226 | ||
b1235d79 | 227 | sk->sk_state = BT_CLOSED; |
0139418c MH |
228 | sock_set_flag(sk, SOCK_ZAPPED); |
229 | ||
230 | if (err) | |
231 | sk->sk_err = err; | |
232 | ||
233 | if (parent) { | |
234 | bt_accept_unlink(sk); | |
235 | parent->sk_data_ready(parent, 0); | |
236 | } else | |
237 | sk->sk_state_change(sk); | |
c13ffa62 | 238 | |
2ead70b8 GP |
239 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE && |
240 | l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE)) | |
241 | goto free; | |
242 | ||
c13ffa62 GP |
243 | skb_queue_purge(TX_QUEUE(sk)); |
244 | ||
245 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { | |
246 | struct srej_list *l, *tmp; | |
247 | ||
e92c8e70 GP |
248 | del_timer(&chan->retrans_timer); |
249 | del_timer(&chan->monitor_timer); | |
250 | del_timer(&chan->ack_timer); | |
c13ffa62 | 251 | |
f1c6775b GP |
252 | skb_queue_purge(&chan->srej_q); |
253 | skb_queue_purge(&chan->busy_q); | |
c13ffa62 | 254 | |
39d5a3ee | 255 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
c13ffa62 GP |
256 | list_del(&l->list); |
257 | kfree(l); | |
258 | } | |
259 | } | |
48454079 | 260 | |
2ead70b8 | 261 | free: |
48454079 | 262 | kfree(chan); |
0139418c MH |
263 | } |
264 | ||
8556edd3 | 265 | static inline u8 l2cap_get_auth_type(struct sock *sk) |
79d554a6 | 266 | { |
8556edd3 JH |
267 | if (sk->sk_type == SOCK_RAW) { |
268 | switch (l2cap_pi(sk)->sec_level) { | |
269 | case BT_SECURITY_HIGH: | |
270 | return HCI_AT_DEDICATED_BONDING_MITM; | |
271 | case BT_SECURITY_MEDIUM: | |
272 | return HCI_AT_DEDICATED_BONDING; | |
273 | default: | |
274 | return HCI_AT_NO_BONDING; | |
275 | } | |
276 | } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { | |
277 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) | |
278 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 279 | |
00ae4af9 | 280 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 281 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 282 | else |
8556edd3 | 283 | return HCI_AT_NO_BONDING; |
00ae4af9 MH |
284 | } else { |
285 | switch (l2cap_pi(sk)->sec_level) { | |
286 | case BT_SECURITY_HIGH: | |
8556edd3 | 287 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 288 | case BT_SECURITY_MEDIUM: |
8556edd3 | 289 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 290 | default: |
8556edd3 | 291 | return HCI_AT_NO_BONDING; |
00ae4af9 | 292 | } |
0684e5f9 | 293 | } |
8556edd3 JH |
294 | } |
295 | ||
296 | /* Service level security */ | |
297 | static inline int l2cap_check_security(struct sock *sk) | |
298 | { | |
299 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
300 | __u8 auth_type; | |
301 | ||
302 | auth_type = l2cap_get_auth_type(sk); | |
79d554a6 | 303 | |
0684e5f9 MH |
304 | return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level, |
305 | auth_type); | |
79d554a6 MH |
306 | } |
307 | ||
68983259 | 308 | u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
309 | { |
310 | u8 id; | |
311 | ||
312 | /* Get next available identificator. | |
313 | * 1 - 128 are used by kernel. | |
314 | * 129 - 199 are reserved. | |
315 | * 200 - 254 are used by utilities like l2ping, etc. | |
316 | */ | |
317 | ||
318 | spin_lock_bh(&conn->lock); | |
319 | ||
320 | if (++conn->tx_ident > 128) | |
321 | conn->tx_ident = 1; | |
322 | ||
323 | id = conn->tx_ident; | |
324 | ||
325 | spin_unlock_bh(&conn->lock); | |
326 | ||
327 | return id; | |
328 | } | |
329 | ||
68983259 | 330 | void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
331 | { |
332 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 333 | u8 flags; |
4e8402a3 MH |
334 | |
335 | BT_DBG("code 0x%2.2x", code); | |
336 | ||
337 | if (!skb) | |
9a9c6a34 | 338 | return; |
4e8402a3 | 339 | |
e702112f AE |
340 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
341 | flags = ACL_START_NO_FLUSH; | |
342 | else | |
343 | flags = ACL_START; | |
344 | ||
345 | hci_send_acl(conn->hcon, skb, flags); | |
4e8402a3 MH |
346 | } |
347 | ||
525cd185 | 348 | static inline void l2cap_send_sframe(struct l2cap_chan *chan, u16 control) |
1c2acffb GP |
349 | { |
350 | struct sk_buff *skb; | |
351 | struct l2cap_hdr *lh; | |
525cd185 | 352 | struct l2cap_pinfo *pi = l2cap_pi(chan->sk); |
1c2acffb | 353 | struct l2cap_conn *conn = pi->conn; |
c13ffa62 | 354 | struct sock *sk = (struct sock *)pi; |
fcc203c3 | 355 | int count, hlen = L2CAP_HDR_SIZE + 2; |
e702112f | 356 | u8 flags; |
fcc203c3 | 357 | |
c13ffa62 GP |
358 | if (sk->sk_state != BT_CONNECTED) |
359 | return; | |
360 | ||
fcc203c3 GP |
361 | if (pi->fcs == L2CAP_FCS_CRC16) |
362 | hlen += 2; | |
1c2acffb | 363 | |
49208c9c | 364 | BT_DBG("chan %p, control 0x%2.2x", chan, control); |
1c2acffb | 365 | |
fcc203c3 | 366 | count = min_t(unsigned int, conn->mtu, hlen); |
1c2acffb GP |
367 | control |= L2CAP_CTRL_FRAME_TYPE; |
368 | ||
525cd185 | 369 | if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { |
9e917af1 | 370 | control |= L2CAP_CTRL_FINAL; |
525cd185 | 371 | chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; |
9e917af1 GP |
372 | } |
373 | ||
525cd185 | 374 | if (chan->conn_state & L2CAP_CONN_SEND_PBIT) { |
f0946ccf | 375 | control |= L2CAP_CTRL_POLL; |
525cd185 | 376 | chan->conn_state &= ~L2CAP_CONN_SEND_PBIT; |
f0946ccf GP |
377 | } |
378 | ||
1c2acffb GP |
379 | skb = bt_skb_alloc(count, GFP_ATOMIC); |
380 | if (!skb) | |
9a9c6a34 | 381 | return; |
1c2acffb GP |
382 | |
383 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fcc203c3 | 384 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
1c2acffb GP |
385 | lh->cid = cpu_to_le16(pi->dcid); |
386 | put_unaligned_le16(control, skb_put(skb, 2)); | |
387 | ||
fcc203c3 GP |
388 | if (pi->fcs == L2CAP_FCS_CRC16) { |
389 | u16 fcs = crc16(0, (u8 *)lh, count - 2); | |
390 | put_unaligned_le16(fcs, skb_put(skb, 2)); | |
391 | } | |
392 | ||
e702112f AE |
393 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
394 | flags = ACL_START_NO_FLUSH; | |
395 | else | |
396 | flags = ACL_START; | |
397 | ||
398 | hci_send_acl(pi->conn->hcon, skb, flags); | |
1c2acffb GP |
399 | } |
400 | ||
525cd185 | 401 | static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u16 control) |
7e743090 | 402 | { |
525cd185 | 403 | if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
7e743090 | 404 | control |= L2CAP_SUPER_RCV_NOT_READY; |
525cd185 | 405 | chan->conn_state |= L2CAP_CONN_RNR_SENT; |
1890d36b | 406 | } else |
7e743090 GP |
407 | control |= L2CAP_SUPER_RCV_READY; |
408 | ||
42e5c802 | 409 | control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
2ab25cdd | 410 | |
525cd185 | 411 | l2cap_send_sframe(chan, control); |
7e743090 GP |
412 | } |
413 | ||
e501d055 AE |
414 | static inline int __l2cap_no_conn_pending(struct sock *sk) |
415 | { | |
416 | return !(l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND); | |
417 | } | |
418 | ||
fc7f8a7e | 419 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 420 | { |
fc7f8a7e | 421 | struct sock *sk = chan->sk; |
79d554a6 MH |
422 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
423 | ||
424 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
984947dc MH |
425 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
426 | return; | |
427 | ||
e501d055 | 428 | if (l2cap_check_security(sk) && __l2cap_no_conn_pending(sk)) { |
b1235d79 MH |
429 | struct l2cap_conn_req req; |
430 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
431 | req.psm = l2cap_pi(sk)->psm; | |
79d554a6 | 432 | |
fc7f8a7e | 433 | chan->ident = l2cap_get_ident(conn); |
e501d055 | 434 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
79d554a6 | 435 | |
fc7f8a7e GP |
436 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, |
437 | sizeof(req), &req); | |
b1235d79 | 438 | } |
79d554a6 MH |
439 | } else { |
440 | struct l2cap_info_req req; | |
441 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
442 | ||
443 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
444 | conn->info_ident = l2cap_get_ident(conn); | |
445 | ||
446 | mod_timer(&conn->info_timer, jiffies + | |
447 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
448 | ||
449 | l2cap_send_cmd(conn, conn->info_ident, | |
450 | L2CAP_INFO_REQ, sizeof(req), &req); | |
451 | } | |
452 | } | |
453 | ||
cf6c2c0b GP |
454 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
455 | { | |
456 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 457 | if (!disable_ertm) |
cf6c2c0b GP |
458 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
459 | ||
460 | switch (mode) { | |
461 | case L2CAP_MODE_ERTM: | |
462 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
463 | case L2CAP_MODE_STREAMING: | |
464 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
465 | default: | |
466 | return 0x00; | |
467 | } | |
468 | } | |
469 | ||
e92c8e70 | 470 | void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 471 | { |
e92c8e70 | 472 | struct sock *sk; |
22121fc9 GP |
473 | struct l2cap_disconn_req req; |
474 | ||
c13ffa62 GP |
475 | if (!conn) |
476 | return; | |
477 | ||
e92c8e70 GP |
478 | sk = chan->sk; |
479 | ||
c13ffa62 GP |
480 | skb_queue_purge(TX_QUEUE(sk)); |
481 | ||
482 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { | |
e92c8e70 GP |
483 | del_timer(&chan->retrans_timer); |
484 | del_timer(&chan->monitor_timer); | |
485 | del_timer(&chan->ack_timer); | |
c13ffa62 GP |
486 | } |
487 | ||
22121fc9 GP |
488 | req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); |
489 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
490 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
491 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 GP |
492 | |
493 | sk->sk_state = BT_DISCONN; | |
9b108fc0 | 494 | sk->sk_err = err; |
22121fc9 GP |
495 | } |
496 | ||
1da177e4 | 497 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
498 | static void l2cap_conn_start(struct l2cap_conn *conn) |
499 | { | |
820ffdb3 | 500 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
501 | |
502 | BT_DBG("conn %p", conn); | |
503 | ||
baa7e1fa | 504 | read_lock(&conn->chan_lock); |
4e8402a3 | 505 | |
820ffdb3 | 506 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 507 | struct sock *sk = chan->sk; |
baa7e1fa | 508 | |
4e8402a3 MH |
509 | bh_lock_sock(sk); |
510 | ||
bd3c9e25 GP |
511 | if (sk->sk_type != SOCK_SEQPACKET && |
512 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
513 | bh_unlock_sock(sk); |
514 | continue; | |
515 | } | |
516 | ||
517 | if (sk->sk_state == BT_CONNECT) { | |
47731de7 | 518 | struct l2cap_conn_req req; |
79d554a6 | 519 | |
47731de7 GP |
520 | if (!l2cap_check_security(sk) || |
521 | !__l2cap_no_conn_pending(sk)) { | |
522 | bh_unlock_sock(sk); | |
523 | continue; | |
524 | } | |
79d554a6 | 525 | |
47731de7 GP |
526 | if (!l2cap_mode_supported(l2cap_pi(sk)->mode, |
527 | conn->feat_mask) | |
528 | && l2cap_pi(sk)->conf_state & | |
529 | L2CAP_CONF_STATE2_DEVICE) { | |
820ffdb3 GP |
530 | /* __l2cap_sock_close() calls list_del(chan) |
531 | * so release the lock */ | |
532 | read_unlock_bh(&conn->chan_lock); | |
533 | __l2cap_sock_close(sk, ECONNRESET); | |
534 | read_lock_bh(&conn->chan_lock); | |
47731de7 GP |
535 | bh_unlock_sock(sk); |
536 | continue; | |
b1235d79 | 537 | } |
47731de7 GP |
538 | |
539 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
540 | req.psm = l2cap_pi(sk)->psm; | |
541 | ||
fc7f8a7e | 542 | chan->ident = l2cap_get_ident(conn); |
47731de7 GP |
543 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
544 | ||
fc7f8a7e GP |
545 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, |
546 | sizeof(req), &req); | |
47731de7 | 547 | |
79d554a6 MH |
548 | } else if (sk->sk_state == BT_CONNECT2) { |
549 | struct l2cap_conn_rsp rsp; | |
e9aeb2dd | 550 | char buf[128]; |
79d554a6 MH |
551 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
552 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
553 | ||
2af6b9d5 | 554 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
555 | if (bt_sk(sk)->defer_setup) { |
556 | struct sock *parent = bt_sk(sk)->parent; | |
557 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
558 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
559 | parent->sk_data_ready(parent, 0); | |
560 | ||
561 | } else { | |
562 | sk->sk_state = BT_CONFIG; | |
563 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
564 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
565 | } | |
79d554a6 MH |
566 | } else { |
567 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
568 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
569 | } | |
570 | ||
fc7f8a7e GP |
571 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
572 | sizeof(rsp), &rsp); | |
e9aeb2dd GP |
573 | |
574 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT || | |
575 | rsp.result != L2CAP_CR_SUCCESS) { | |
576 | bh_unlock_sock(sk); | |
577 | continue; | |
578 | } | |
579 | ||
580 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
581 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
73ffa904 GP |
582 | l2cap_build_conf_req(chan, buf), buf); |
583 | chan->num_conf_req++; | |
4e8402a3 MH |
584 | } |
585 | ||
586 | bh_unlock_sock(sk); | |
587 | } | |
588 | ||
baa7e1fa | 589 | read_unlock(&conn->chan_lock); |
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 | { | |
b62f328b | 626 | struct sock *parent, *uninitialized_var(sk); |
48454079 | 627 | struct l2cap_chan *chan; |
b62f328b VT |
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 | ||
48454079 GP |
647 | chan = l2cap_chan_alloc(sk); |
648 | if (!chan) { | |
649 | l2cap_sock_kill(sk); | |
650 | goto clean; | |
651 | } | |
652 | ||
baa7e1fa | 653 | write_lock_bh(&conn->chan_lock); |
b62f328b VT |
654 | |
655 | hci_conn_hold(conn->hcon); | |
656 | ||
657 | l2cap_sock_init(sk, parent); | |
baa7e1fa | 658 | |
b62f328b VT |
659 | bacpy(&bt_sk(sk)->src, conn->src); |
660 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
661 | ||
d1010240 GP |
662 | bt_accept_enqueue(parent, sk); |
663 | ||
48454079 GP |
664 | __l2cap_chan_add(conn, chan); |
665 | ||
666 | l2cap_pi(sk)->chan = chan; | |
b62f328b VT |
667 | |
668 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
669 | ||
670 | sk->sk_state = BT_CONNECTED; | |
671 | parent->sk_data_ready(parent, 0); | |
672 | ||
baa7e1fa | 673 | write_unlock_bh(&conn->chan_lock); |
b62f328b VT |
674 | |
675 | clean: | |
676 | bh_unlock_sock(parent); | |
677 | } | |
678 | ||
4e8402a3 MH |
679 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
680 | { | |
48454079 | 681 | struct l2cap_chan *chan; |
4e8402a3 | 682 | |
79d554a6 | 683 | BT_DBG("conn %p", conn); |
4e8402a3 | 684 | |
b62f328b VT |
685 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
686 | l2cap_le_conn_ready(conn); | |
687 | ||
baa7e1fa | 688 | read_lock(&conn->chan_lock); |
4e8402a3 | 689 | |
baa7e1fa | 690 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 691 | struct sock *sk = chan->sk; |
baa7e1fa | 692 | |
79d554a6 | 693 | bh_lock_sock(sk); |
4e8402a3 | 694 | |
acd7d370 VT |
695 | if (conn->hcon->type == LE_LINK) { |
696 | l2cap_sock_clear_timer(sk); | |
697 | sk->sk_state = BT_CONNECTED; | |
698 | sk->sk_state_change(sk); | |
699 | } | |
700 | ||
bd3c9e25 GP |
701 | if (sk->sk_type != SOCK_SEQPACKET && |
702 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
703 | l2cap_sock_clear_timer(sk); |
704 | sk->sk_state = BT_CONNECTED; | |
705 | sk->sk_state_change(sk); | |
706 | } else if (sk->sk_state == BT_CONNECT) | |
fc7f8a7e | 707 | l2cap_do_start(chan); |
4e8402a3 | 708 | |
79d554a6 | 709 | bh_unlock_sock(sk); |
4e8402a3 | 710 | } |
79d554a6 | 711 | |
baa7e1fa | 712 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
713 | } |
714 | ||
715 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
716 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
717 | { | |
48454079 | 718 | struct l2cap_chan *chan; |
4e8402a3 MH |
719 | |
720 | BT_DBG("conn %p", conn); | |
721 | ||
baa7e1fa | 722 | read_lock(&conn->chan_lock); |
4e8402a3 | 723 | |
baa7e1fa | 724 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 725 | struct sock *sk = chan->sk; |
baa7e1fa | 726 | |
2af6b9d5 | 727 | if (l2cap_pi(sk)->force_reliable) |
4e8402a3 MH |
728 | sk->sk_err = err; |
729 | } | |
730 | ||
baa7e1fa | 731 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
732 | } |
733 | ||
734 | static void l2cap_info_timeout(unsigned long arg) | |
735 | { | |
736 | struct l2cap_conn *conn = (void *) arg; | |
737 | ||
984947dc | 738 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 739 | conn->info_ident = 0; |
984947dc | 740 | |
4e8402a3 MH |
741 | l2cap_conn_start(conn); |
742 | } | |
743 | ||
1da177e4 LT |
744 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
745 | { | |
0139418c | 746 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 747 | |
0139418c | 748 | if (conn || status) |
1da177e4 LT |
749 | return conn; |
750 | ||
0139418c MH |
751 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
752 | if (!conn) | |
1da177e4 | 753 | return NULL; |
1da177e4 LT |
754 | |
755 | hcon->l2cap_data = conn; | |
756 | conn->hcon = hcon; | |
757 | ||
0139418c MH |
758 | BT_DBG("hcon %p conn %p", hcon, conn); |
759 | ||
acd7d370 VT |
760 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
761 | conn->mtu = hcon->hdev->le_mtu; | |
762 | else | |
763 | conn->mtu = hcon->hdev->acl_mtu; | |
764 | ||
1da177e4 LT |
765 | conn->src = &hcon->hdev->bdaddr; |
766 | conn->dst = &hcon->dst; | |
767 | ||
4e8402a3 MH |
768 | conn->feat_mask = 0; |
769 | ||
1da177e4 | 770 | spin_lock_init(&conn->lock); |
baa7e1fa GP |
771 | rwlock_init(&conn->chan_lock); |
772 | ||
773 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 774 | |
b62f328b VT |
775 | if (hcon->type != LE_LINK) |
776 | setup_timer(&conn->info_timer, l2cap_info_timeout, | |
45054dc1 DY |
777 | (unsigned long) conn); |
778 | ||
2950f21a MH |
779 | conn->disc_reason = 0x13; |
780 | ||
1da177e4 LT |
781 | return conn; |
782 | } | |
783 | ||
0139418c | 784 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1da177e4 | 785 | { |
0139418c | 786 | struct l2cap_conn *conn = hcon->l2cap_data; |
baa7e1fa | 787 | struct l2cap_chan *chan, *l; |
1da177e4 LT |
788 | struct sock *sk; |
789 | ||
0139418c MH |
790 | if (!conn) |
791 | return; | |
1da177e4 LT |
792 | |
793 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
794 | ||
7585b97a | 795 | kfree_skb(conn->rx_skb); |
1da177e4 LT |
796 | |
797 | /* Kill channels */ | |
baa7e1fa | 798 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { |
48454079 | 799 | sk = chan->sk; |
1da177e4 | 800 | bh_lock_sock(sk); |
48454079 | 801 | l2cap_chan_del(chan, err); |
1da177e4 LT |
802 | bh_unlock_sock(sk); |
803 | l2cap_sock_kill(sk); | |
804 | } | |
805 | ||
8e8440f5 DY |
806 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
807 | del_timer_sync(&conn->info_timer); | |
3ab22731 | 808 | |
1da177e4 LT |
809 | hcon->l2cap_data = NULL; |
810 | kfree(conn); | |
1da177e4 LT |
811 | } |
812 | ||
48454079 | 813 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
1da177e4 | 814 | { |
baa7e1fa | 815 | write_lock_bh(&conn->chan_lock); |
48454079 | 816 | __l2cap_chan_add(conn, chan); |
baa7e1fa | 817 | write_unlock_bh(&conn->chan_lock); |
1da177e4 LT |
818 | } |
819 | ||
1da177e4 | 820 | /* ---- Socket interface ---- */ |
1da177e4 LT |
821 | |
822 | /* Find socket with psm and source bdaddr. | |
823 | * Returns closest match. | |
824 | */ | |
e0f0cb56 | 825 | static struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
826 | { |
827 | struct sock *sk = NULL, *sk1 = NULL; | |
828 | struct hlist_node *node; | |
829 | ||
e0f0cb56 GP |
830 | read_lock(&l2cap_sk_list.lock); |
831 | ||
1da177e4 LT |
832 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
833 | if (state && sk->sk_state != state) | |
834 | continue; | |
835 | ||
836 | if (l2cap_pi(sk)->psm == psm) { | |
837 | /* Exact match. */ | |
838 | if (!bacmp(&bt_sk(sk)->src, src)) | |
839 | break; | |
840 | ||
841 | /* Closest match */ | |
842 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
843 | sk1 = sk; | |
844 | } | |
845 | } | |
1da177e4 | 846 | |
1da177e4 | 847 | read_unlock(&l2cap_sk_list.lock); |
e0f0cb56 GP |
848 | |
849 | return node ? sk : sk1; | |
1da177e4 LT |
850 | } |
851 | ||
4e34c50b | 852 | int l2cap_do_connect(struct sock *sk) |
1da177e4 LT |
853 | { |
854 | bdaddr_t *src = &bt_sk(sk)->src; | |
855 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
856 | struct l2cap_conn *conn; | |
48454079 | 857 | struct l2cap_chan *chan; |
1da177e4 LT |
858 | struct hci_conn *hcon; |
859 | struct hci_dev *hdev; | |
09ab6f4c | 860 | __u8 auth_type; |
44d0e48e | 861 | int err; |
1da177e4 | 862 | |
f29972de MH |
863 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
864 | l2cap_pi(sk)->psm); | |
1da177e4 | 865 | |
af05b30b GP |
866 | hdev = hci_get_route(dst, src); |
867 | if (!hdev) | |
1da177e4 LT |
868 | return -EHOSTUNREACH; |
869 | ||
870 | hci_dev_lock_bh(hdev); | |
871 | ||
8556edd3 | 872 | auth_type = l2cap_get_auth_type(sk); |
09ab6f4c | 873 | |
acd7d370 VT |
874 | if (l2cap_pi(sk)->dcid == L2CAP_CID_LE_DATA) |
875 | hcon = hci_connect(hdev, LE_LINK, dst, | |
2af6b9d5 | 876 | l2cap_pi(sk)->sec_level, auth_type); |
acd7d370 VT |
877 | else |
878 | hcon = hci_connect(hdev, ACL_LINK, dst, | |
879 | l2cap_pi(sk)->sec_level, auth_type); | |
880 | ||
30e76272 VT |
881 | if (IS_ERR(hcon)) { |
882 | err = PTR_ERR(hcon); | |
1da177e4 | 883 | goto done; |
30e76272 | 884 | } |
1da177e4 LT |
885 | |
886 | conn = l2cap_conn_add(hcon, 0); | |
887 | if (!conn) { | |
888 | hci_conn_put(hcon); | |
30e76272 | 889 | err = -ENOMEM; |
1da177e4 LT |
890 | goto done; |
891 | } | |
892 | ||
48454079 GP |
893 | chan = l2cap_chan_alloc(sk); |
894 | if (!chan) { | |
895 | hci_conn_put(hcon); | |
896 | err = -ENOMEM; | |
897 | goto done; | |
898 | } | |
899 | ||
1da177e4 LT |
900 | /* Update source addr of the socket */ |
901 | bacpy(src, conn->src); | |
902 | ||
48454079 GP |
903 | l2cap_chan_add(conn, chan); |
904 | ||
905 | l2cap_pi(sk)->chan = chan; | |
1da177e4 LT |
906 | |
907 | sk->sk_state = BT_CONNECT; | |
908 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
909 | ||
910 | if (hcon->state == BT_CONNECTED) { | |
bd3c9e25 GP |
911 | if (sk->sk_type != SOCK_SEQPACKET && |
912 | sk->sk_type != SOCK_STREAM) { | |
1da177e4 | 913 | l2cap_sock_clear_timer(sk); |
d00ef24f JH |
914 | if (l2cap_check_security(sk)) |
915 | sk->sk_state = BT_CONNECTED; | |
79d554a6 | 916 | } else |
fc7f8a7e | 917 | l2cap_do_start(chan); |
1da177e4 LT |
918 | } |
919 | ||
30e76272 VT |
920 | err = 0; |
921 | ||
1da177e4 LT |
922 | done: |
923 | hci_dev_unlock_bh(hdev); | |
924 | hci_dev_put(hdev); | |
925 | return err; | |
926 | } | |
927 | ||
dcba0dba | 928 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 GP |
929 | { |
930 | DECLARE_WAITQUEUE(wait, current); | |
931 | int err = 0; | |
932 | int timeo = HZ/5; | |
933 | ||
2b0b05dd | 934 | add_wait_queue(sk_sleep(sk), &wait); |
6a026610 | 935 | while ((l2cap_pi(sk)->chan->unacked_frames > 0 && l2cap_pi(sk)->conn)) { |
6161c038 GP |
936 | set_current_state(TASK_INTERRUPTIBLE); |
937 | ||
938 | if (!timeo) | |
939 | timeo = HZ/5; | |
940 | ||
941 | if (signal_pending(current)) { | |
942 | err = sock_intr_errno(timeo); | |
943 | break; | |
944 | } | |
945 | ||
946 | release_sock(sk); | |
947 | timeo = schedule_timeout(timeo); | |
948 | lock_sock(sk); | |
949 | ||
950 | err = sock_error(sk); | |
951 | if (err) | |
952 | break; | |
953 | } | |
954 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 955 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
956 | return err; |
957 | } | |
958 | ||
e90bac06 GP |
959 | static void l2cap_monitor_timeout(unsigned long arg) |
960 | { | |
525cd185 GP |
961 | struct l2cap_chan *chan = (void *) arg; |
962 | struct sock *sk = chan->sk; | |
e90bac06 | 963 | |
525cd185 | 964 | BT_DBG("chan %p", chan); |
0e98958d | 965 | |
e686219a | 966 | bh_lock_sock(sk); |
2c03a7a4 | 967 | if (chan->retry_count >= chan->remote_max_tx) { |
e92c8e70 | 968 | l2cap_send_disconn_req(l2cap_pi(sk)->conn, chan, ECONNABORTED); |
b13f5860 | 969 | bh_unlock_sock(sk); |
e90bac06 GP |
970 | return; |
971 | } | |
972 | ||
6a026610 | 973 | chan->retry_count++; |
e90bac06 GP |
974 | __mod_monitor_timer(); |
975 | ||
525cd185 | 976 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
e686219a | 977 | bh_unlock_sock(sk); |
e90bac06 GP |
978 | } |
979 | ||
980 | static void l2cap_retrans_timeout(unsigned long arg) | |
981 | { | |
525cd185 GP |
982 | struct l2cap_chan *chan = (void *) arg; |
983 | struct sock *sk = chan->sk; | |
e90bac06 | 984 | |
49208c9c | 985 | BT_DBG("chan %p", chan); |
0e98958d | 986 | |
e686219a | 987 | bh_lock_sock(sk); |
6a026610 | 988 | chan->retry_count = 1; |
e90bac06 GP |
989 | __mod_monitor_timer(); |
990 | ||
525cd185 | 991 | chan->conn_state |= L2CAP_CONN_WAIT_F; |
e90bac06 | 992 | |
525cd185 | 993 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
e686219a | 994 | bh_unlock_sock(sk); |
e90bac06 GP |
995 | } |
996 | ||
42e5c802 | 997 | static void l2cap_drop_acked_frames(struct l2cap_chan *chan) |
1da177e4 | 998 | { |
42e5c802 | 999 | struct sock *sk = chan->sk; |
1c2acffb | 1000 | struct sk_buff *skb; |
1da177e4 | 1001 | |
812e737e | 1002 | while ((skb = skb_peek(TX_QUEUE(sk))) && |
6a026610 | 1003 | chan->unacked_frames) { |
42e5c802 | 1004 | if (bt_cb(skb)->tx_seq == chan->expected_ack_seq) |
1c2acffb | 1005 | break; |
1da177e4 | 1006 | |
1c2acffb GP |
1007 | skb = skb_dequeue(TX_QUEUE(sk)); |
1008 | kfree_skb(skb); | |
1da177e4 | 1009 | |
6a026610 | 1010 | chan->unacked_frames--; |
1c2acffb | 1011 | } |
1da177e4 | 1012 | |
6a026610 | 1013 | if (!chan->unacked_frames) |
e92c8e70 | 1014 | del_timer(&chan->retrans_timer); |
1c2acffb | 1015 | } |
1da177e4 | 1016 | |
fd83ccdb | 1017 | void l2cap_do_send(struct sock *sk, struct sk_buff *skb) |
1c2acffb GP |
1018 | { |
1019 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
e702112f AE |
1020 | struct hci_conn *hcon = pi->conn->hcon; |
1021 | u16 flags; | |
1c2acffb GP |
1022 | |
1023 | BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len); | |
1da177e4 | 1024 | |
e702112f AE |
1025 | if (!pi->flushable && lmp_no_flush_capable(hcon->hdev)) |
1026 | flags = ACL_START_NO_FLUSH; | |
1027 | else | |
1028 | flags = ACL_START; | |
1029 | ||
1030 | hci_send_acl(hcon, skb, flags); | |
1c2acffb GP |
1031 | } |
1032 | ||
42e5c802 | 1033 | void l2cap_streaming_send(struct l2cap_chan *chan) |
6840ed07 | 1034 | { |
42e5c802 | 1035 | struct sock *sk = chan->sk; |
ccbb84af | 1036 | struct sk_buff *skb; |
6840ed07 | 1037 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
fcc203c3 | 1038 | u16 control, fcs; |
6840ed07 | 1039 | |
ccbb84af GP |
1040 | while ((skb = skb_dequeue(TX_QUEUE(sk)))) { |
1041 | control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE); | |
42e5c802 | 1042 | control |= chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; |
ccbb84af | 1043 | put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE); |
6840ed07 | 1044 | |
e8235c6b | 1045 | if (pi->fcs == L2CAP_FCS_CRC16) { |
ccbb84af GP |
1046 | fcs = crc16(0, (u8 *)skb->data, skb->len - 2); |
1047 | put_unaligned_le16(fcs, skb->data + skb->len - 2); | |
fcc203c3 GP |
1048 | } |
1049 | ||
ccbb84af | 1050 | l2cap_do_send(sk, skb); |
6840ed07 | 1051 | |
42e5c802 | 1052 | chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; |
6840ed07 | 1053 | } |
6840ed07 GP |
1054 | } |
1055 | ||
525cd185 | 1056 | static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f | 1057 | { |
525cd185 | 1058 | struct sock *sk = chan->sk; |
8f17154f GP |
1059 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
1060 | struct sk_buff *skb, *tx_skb; | |
1061 | u16 control, fcs; | |
8f17154f GP |
1062 | |
1063 | skb = skb_peek(TX_QUEUE(sk)); | |
f11d676d GP |
1064 | if (!skb) |
1065 | return; | |
8f17154f | 1066 | |
f11d676d GP |
1067 | do { |
1068 | if (bt_cb(skb)->tx_seq == tx_seq) | |
8f17154f | 1069 | break; |
8f17154f | 1070 | |
f11d676d GP |
1071 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) |
1072 | return; | |
8f17154f | 1073 | |
f11d676d | 1074 | } while ((skb = skb_queue_next(TX_QUEUE(sk), skb))); |
8f17154f | 1075 | |
2c03a7a4 GP |
1076 | if (chan->remote_max_tx && |
1077 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
e92c8e70 | 1078 | l2cap_send_disconn_req(pi->conn, chan, ECONNABORTED); |
f11d676d GP |
1079 | return; |
1080 | } | |
1081 | ||
1082 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1083 | bt_cb(skb)->retries++; | |
1084 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
3cb123d1 | 1085 | |
525cd185 | 1086 | if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { |
3cb123d1 | 1087 | control |= L2CAP_CTRL_FINAL; |
525cd185 | 1088 | chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; |
3cb123d1 | 1089 | } |
95ffa978 | 1090 | |
42e5c802 | 1091 | control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
f11d676d | 1092 | | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); |
3cb123d1 | 1093 | |
f11d676d GP |
1094 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1095 | ||
1096 | if (pi->fcs == L2CAP_FCS_CRC16) { | |
1097 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); | |
1098 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1099 | } | |
1100 | ||
1101 | l2cap_do_send(sk, tx_skb); | |
8f17154f GP |
1102 | } |
1103 | ||
525cd185 | 1104 | int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1105 | { |
1106 | struct sk_buff *skb, *tx_skb; | |
525cd185 | 1107 | struct sock *sk = chan->sk; |
1c2acffb | 1108 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
fcc203c3 | 1109 | u16 control, fcs; |
9a9c6a34 | 1110 | int nsent = 0; |
1c2acffb | 1111 | |
c13ffa62 GP |
1112 | if (sk->sk_state != BT_CONNECTED) |
1113 | return -ENOTCONN; | |
e90bac06 | 1114 | |
42e5c802 | 1115 | while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(chan))) { |
1c2acffb | 1116 | |
2c03a7a4 GP |
1117 | if (chan->remote_max_tx && |
1118 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
e92c8e70 | 1119 | l2cap_send_disconn_req(pi->conn, chan, ECONNABORTED); |
e90bac06 GP |
1120 | break; |
1121 | } | |
1122 | ||
e420aba3 AE |
1123 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1124 | ||
e90bac06 GP |
1125 | bt_cb(skb)->retries++; |
1126 | ||
1c2acffb | 1127 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
95ffa978 GP |
1128 | control &= L2CAP_CTRL_SAR; |
1129 | ||
525cd185 | 1130 | if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { |
d5392c8f | 1131 | control |= L2CAP_CTRL_FINAL; |
525cd185 | 1132 | chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; |
d5392c8f | 1133 | } |
42e5c802 GP |
1134 | control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1135 | | (chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); | |
1c2acffb GP |
1136 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1137 | ||
e90bac06 | 1138 | |
e8235c6b | 1139 | if (pi->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1140 | fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); |
1141 | put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); | |
1142 | } | |
1143 | ||
9a9c6a34 GP |
1144 | l2cap_do_send(sk, tx_skb); |
1145 | ||
e90bac06 | 1146 | __mod_retrans_timer(); |
1c2acffb | 1147 | |
42e5c802 GP |
1148 | bt_cb(skb)->tx_seq = chan->next_tx_seq; |
1149 | chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; | |
1c2acffb | 1150 | |
23e9fde2 | 1151 | if (bt_cb(skb)->retries == 1) |
6a026610 | 1152 | chan->unacked_frames++; |
23e9fde2 | 1153 | |
6a026610 | 1154 | chan->frames_sent++; |
1c2acffb GP |
1155 | |
1156 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) | |
1157 | sk->sk_send_head = NULL; | |
1158 | else | |
1159 | sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); | |
9e917af1 GP |
1160 | |
1161 | nsent++; | |
1c2acffb GP |
1162 | } |
1163 | ||
9e917af1 GP |
1164 | return nsent; |
1165 | } | |
1166 | ||
525cd185 | 1167 | static int l2cap_retransmit_frames(struct l2cap_chan *chan) |
dfc909be | 1168 | { |
525cd185 | 1169 | struct sock *sk = chan->sk; |
dfc909be GP |
1170 | int ret; |
1171 | ||
dfc909be GP |
1172 | if (!skb_queue_empty(TX_QUEUE(sk))) |
1173 | sk->sk_send_head = TX_QUEUE(sk)->next; | |
1174 | ||
42e5c802 | 1175 | chan->next_tx_seq = chan->expected_ack_seq; |
525cd185 | 1176 | ret = l2cap_ertm_send(chan); |
dfc909be GP |
1177 | return ret; |
1178 | } | |
1179 | ||
525cd185 | 1180 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1181 | { |
9e917af1 GP |
1182 | u16 control = 0; |
1183 | ||
42e5c802 | 1184 | control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
9e917af1 | 1185 | |
525cd185 | 1186 | if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
9e917af1 | 1187 | control |= L2CAP_SUPER_RCV_NOT_READY; |
525cd185 GP |
1188 | chan->conn_state |= L2CAP_CONN_RNR_SENT; |
1189 | l2cap_send_sframe(chan, control); | |
9a9c6a34 | 1190 | return; |
9e917af1 | 1191 | } |
dfc909be | 1192 | |
525cd185 | 1193 | if (l2cap_ertm_send(chan) > 0) |
dfc909be GP |
1194 | return; |
1195 | ||
1196 | control |= L2CAP_SUPER_RCV_READY; | |
525cd185 | 1197 | l2cap_send_sframe(chan, control); |
1c2acffb GP |
1198 | } |
1199 | ||
525cd185 | 1200 | static void l2cap_send_srejtail(struct l2cap_chan *chan) |
99b0d4b7 GP |
1201 | { |
1202 | struct srej_list *tail; | |
1203 | u16 control; | |
1204 | ||
1205 | control = L2CAP_SUPER_SELECT_REJECT; | |
1206 | control |= L2CAP_CTRL_FINAL; | |
1207 | ||
39d5a3ee | 1208 | tail = list_entry((&chan->srej_l)->prev, struct srej_list, list); |
99b0d4b7 GP |
1209 | control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
1210 | ||
525cd185 | 1211 | l2cap_send_sframe(chan, control); |
99b0d4b7 GP |
1212 | } |
1213 | ||
1c2acffb GP |
1214 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1215 | { | |
1216 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1217 | struct sk_buff **frag; | |
1218 | int err, sent = 0; | |
1da177e4 | 1219 | |
59203a21 | 1220 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1221 | return -EFAULT; |
1da177e4 LT |
1222 | |
1223 | sent += count; | |
1224 | len -= count; | |
1225 | ||
1226 | /* Continuation fragments (no L2CAP header) */ | |
1227 | frag = &skb_shinfo(skb)->frag_list; | |
1228 | while (len) { | |
1229 | count = min_t(unsigned int, conn->mtu, len); | |
1230 | ||
1231 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1232 | if (!*frag) | |
0175d629 | 1233 | return err; |
1c2acffb GP |
1234 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1235 | return -EFAULT; | |
1da177e4 LT |
1236 | |
1237 | sent += count; | |
1238 | len -= count; | |
1239 | ||
1240 | frag = &(*frag)->next; | |
1241 | } | |
1da177e4 LT |
1242 | |
1243 | return sent; | |
1c2acffb | 1244 | } |
1da177e4 | 1245 | |
fd83ccdb | 1246 | struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len) |
1c2acffb GP |
1247 | { |
1248 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1249 | struct sk_buff *skb; | |
1250 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1251 | struct l2cap_hdr *lh; | |
1252 | ||
1253 | BT_DBG("sk %p len %d", sk, (int)len); | |
1254 | ||
1255 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1256 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1257 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1258 | if (!skb) | |
0175d629 | 1259 | return ERR_PTR(err); |
1c2acffb GP |
1260 | |
1261 | /* Create L2CAP header */ | |
1262 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1263 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1264 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1265 | put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2)); | |
1266 | ||
1267 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1268 | if (unlikely(err < 0)) { | |
1269 | kfree_skb(skb); | |
1270 | return ERR_PTR(err); | |
1271 | } | |
1272 | return skb; | |
1273 | } | |
1274 | ||
fd83ccdb | 1275 | struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len) |
1c2acffb GP |
1276 | { |
1277 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1278 | struct sk_buff *skb; | |
1279 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1280 | struct l2cap_hdr *lh; | |
1281 | ||
1282 | BT_DBG("sk %p len %d", sk, (int)len); | |
1283 | ||
1284 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1285 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1286 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1287 | if (!skb) | |
0175d629 | 1288 | return ERR_PTR(err); |
1c2acffb GP |
1289 | |
1290 | /* Create L2CAP header */ | |
1291 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1292 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1293 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1294 | ||
1295 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1296 | if (unlikely(err < 0)) { | |
1297 | kfree_skb(skb); | |
1298 | return ERR_PTR(err); | |
1299 | } | |
1300 | return skb; | |
1301 | } | |
1302 | ||
fd83ccdb | 1303 | struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen) |
1c2acffb GP |
1304 | { |
1305 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1306 | struct sk_buff *skb; | |
1307 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1308 | struct l2cap_hdr *lh; | |
1309 | ||
1310 | BT_DBG("sk %p len %d", sk, (int)len); | |
1311 | ||
0ee0d208 GP |
1312 | if (!conn) |
1313 | return ERR_PTR(-ENOTCONN); | |
1314 | ||
c74e560c GP |
1315 | if (sdulen) |
1316 | hlen += 2; | |
1317 | ||
fcc203c3 GP |
1318 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1319 | hlen += 2; | |
1320 | ||
1c2acffb GP |
1321 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1322 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1323 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1324 | if (!skb) | |
0175d629 | 1325 | return ERR_PTR(err); |
1c2acffb GP |
1326 | |
1327 | /* Create L2CAP header */ | |
1328 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1329 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1330 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1331 | put_unaligned_le16(control, skb_put(skb, 2)); | |
c74e560c GP |
1332 | if (sdulen) |
1333 | put_unaligned_le16(sdulen, skb_put(skb, 2)); | |
1c2acffb GP |
1334 | |
1335 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1336 | if (unlikely(err < 0)) { | |
1337 | kfree_skb(skb); | |
1338 | return ERR_PTR(err); | |
1339 | } | |
e90bac06 | 1340 | |
fcc203c3 GP |
1341 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1342 | put_unaligned_le16(0, skb_put(skb, 2)); | |
1343 | ||
e90bac06 | 1344 | bt_cb(skb)->retries = 0; |
1c2acffb | 1345 | return skb; |
1da177e4 LT |
1346 | } |
1347 | ||
2c03a7a4 | 1348 | int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
c74e560c | 1349 | { |
2c03a7a4 | 1350 | struct sock *sk = chan->sk; |
c74e560c GP |
1351 | struct sk_buff *skb; |
1352 | struct sk_buff_head sar_queue; | |
1353 | u16 control; | |
1354 | size_t size = 0; | |
1355 | ||
ff12fd64 | 1356 | skb_queue_head_init(&sar_queue); |
c74e560c | 1357 | control = L2CAP_SDU_START; |
2c03a7a4 | 1358 | skb = l2cap_create_iframe_pdu(sk, msg, chan->remote_mps, control, len); |
c74e560c GP |
1359 | if (IS_ERR(skb)) |
1360 | return PTR_ERR(skb); | |
1361 | ||
1362 | __skb_queue_tail(&sar_queue, skb); | |
2c03a7a4 GP |
1363 | len -= chan->remote_mps; |
1364 | size += chan->remote_mps; | |
c74e560c GP |
1365 | |
1366 | while (len > 0) { | |
1367 | size_t buflen; | |
1368 | ||
2c03a7a4 | 1369 | if (len > chan->remote_mps) { |
44651b85 | 1370 | control = L2CAP_SDU_CONTINUE; |
2c03a7a4 | 1371 | buflen = chan->remote_mps; |
c74e560c | 1372 | } else { |
44651b85 | 1373 | control = L2CAP_SDU_END; |
c74e560c GP |
1374 | buflen = len; |
1375 | } | |
1376 | ||
6840ed07 | 1377 | skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0); |
c74e560c GP |
1378 | if (IS_ERR(skb)) { |
1379 | skb_queue_purge(&sar_queue); | |
1380 | return PTR_ERR(skb); | |
1381 | } | |
1382 | ||
1383 | __skb_queue_tail(&sar_queue, skb); | |
1384 | len -= buflen; | |
1385 | size += buflen; | |
c74e560c GP |
1386 | } |
1387 | skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk)); | |
1388 | if (sk->sk_send_head == NULL) | |
1389 | sk->sk_send_head = sar_queue.next; | |
1390 | ||
1391 | return size; | |
1392 | } | |
1393 | ||
1da177e4 LT |
1394 | static void l2cap_chan_ready(struct sock *sk) |
1395 | { | |
1396 | struct sock *parent = bt_sk(sk)->parent; | |
1397 | ||
1398 | BT_DBG("sk %p, parent %p", sk, parent); | |
1399 | ||
1400 | l2cap_pi(sk)->conf_state = 0; | |
1401 | l2cap_sock_clear_timer(sk); | |
1402 | ||
1403 | if (!parent) { | |
1404 | /* Outgoing channel. | |
1405 | * Wake up socket sleeping on connect. | |
1406 | */ | |
1407 | sk->sk_state = BT_CONNECTED; | |
1408 | sk->sk_state_change(sk); | |
1409 | } else { | |
1410 | /* Incoming channel. | |
1411 | * Wake up socket sleeping on accept. | |
1412 | */ | |
1413 | parent->sk_data_ready(parent, 0); | |
1414 | } | |
1415 | } | |
1416 | ||
1417 | /* Copy frame to all raw sockets on that connection */ | |
1418 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
1419 | { | |
1da177e4 | 1420 | struct sk_buff *nskb; |
48454079 | 1421 | struct l2cap_chan *chan; |
1da177e4 LT |
1422 | |
1423 | BT_DBG("conn %p", conn); | |
1424 | ||
baa7e1fa GP |
1425 | read_lock(&conn->chan_lock); |
1426 | list_for_each_entry(chan, &conn->chan_l, list) { | |
48454079 | 1427 | struct sock *sk = chan->sk; |
1da177e4 LT |
1428 | if (sk->sk_type != SOCK_RAW) |
1429 | continue; | |
1430 | ||
1431 | /* Don't send frame to the socket it came from */ | |
1432 | if (skb->sk == sk) | |
1433 | continue; | |
af05b30b GP |
1434 | nskb = skb_clone(skb, GFP_ATOMIC); |
1435 | if (!nskb) | |
1da177e4 LT |
1436 | continue; |
1437 | ||
1438 | if (sock_queue_rcv_skb(sk, nskb)) | |
1439 | kfree_skb(nskb); | |
1440 | } | |
baa7e1fa | 1441 | read_unlock(&conn->chan_lock); |
1da177e4 LT |
1442 | } |
1443 | ||
1444 | /* ---- L2CAP signalling commands ---- */ | |
1445 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
1446 | u8 code, u8 ident, u16 dlen, void *data) | |
1447 | { | |
1448 | struct sk_buff *skb, **frag; | |
1449 | struct l2cap_cmd_hdr *cmd; | |
1450 | struct l2cap_hdr *lh; | |
1451 | int len, count; | |
1452 | ||
af05b30b GP |
1453 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
1454 | conn, code, ident, dlen); | |
1da177e4 LT |
1455 | |
1456 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
1457 | count = min_t(unsigned int, conn->mtu, len); | |
1458 | ||
1459 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
1460 | if (!skb) | |
1461 | return NULL; | |
1462 | ||
1463 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 1464 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
1465 | |
1466 | if (conn->hcon->type == LE_LINK) | |
1467 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); | |
1468 | else | |
1469 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); | |
1da177e4 LT |
1470 | |
1471 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
1472 | cmd->code = code; | |
1473 | cmd->ident = ident; | |
aca3192c | 1474 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
1475 | |
1476 | if (dlen) { | |
1477 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
1478 | memcpy(skb_put(skb, count), data, count); | |
1479 | data += count; | |
1480 | } | |
1481 | ||
1482 | len -= skb->len; | |
1483 | ||
1484 | /* Continuation fragments (no L2CAP header) */ | |
1485 | frag = &skb_shinfo(skb)->frag_list; | |
1486 | while (len) { | |
1487 | count = min_t(unsigned int, conn->mtu, len); | |
1488 | ||
1489 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
1490 | if (!*frag) | |
1491 | goto fail; | |
1492 | ||
1493 | memcpy(skb_put(*frag, count), data, count); | |
1494 | ||
1495 | len -= count; | |
1496 | data += count; | |
1497 | ||
1498 | frag = &(*frag)->next; | |
1499 | } | |
1500 | ||
1501 | return skb; | |
1502 | ||
1503 | fail: | |
1504 | kfree_skb(skb); | |
1505 | return NULL; | |
1506 | } | |
1507 | ||
1508 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
1509 | { | |
1510 | struct l2cap_conf_opt *opt = *ptr; | |
1511 | int len; | |
1512 | ||
1513 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
1514 | *ptr += len; | |
1515 | ||
1516 | *type = opt->type; | |
1517 | *olen = opt->len; | |
1518 | ||
1519 | switch (opt->len) { | |
1520 | case 1: | |
1521 | *val = *((u8 *) opt->val); | |
1522 | break; | |
1523 | ||
1524 | case 2: | |
bfaaeb3e | 1525 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
1526 | break; |
1527 | ||
1528 | case 4: | |
bfaaeb3e | 1529 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
1530 | break; |
1531 | ||
1532 | default: | |
1533 | *val = (unsigned long) opt->val; | |
1534 | break; | |
1535 | } | |
1536 | ||
1537 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
1538 | return len; | |
1539 | } | |
1540 | ||
1da177e4 LT |
1541 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
1542 | { | |
1543 | struct l2cap_conf_opt *opt = *ptr; | |
1544 | ||
1545 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
1546 | ||
1547 | opt->type = type; | |
1548 | opt->len = len; | |
1549 | ||
1550 | switch (len) { | |
1551 | case 1: | |
1552 | *((u8 *) opt->val) = val; | |
1553 | break; | |
1554 | ||
1555 | case 2: | |
4f8b691c | 1556 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
1557 | break; |
1558 | ||
1559 | case 4: | |
4f8b691c | 1560 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
1561 | break; |
1562 | ||
1563 | default: | |
1564 | memcpy(opt->val, (void *) val, len); | |
1565 | break; | |
1566 | } | |
1567 | ||
1568 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
1569 | } | |
1570 | ||
c1b4f43b GP |
1571 | static void l2cap_ack_timeout(unsigned long arg) |
1572 | { | |
525cd185 | 1573 | struct l2cap_chan *chan = (void *) arg; |
c1b4f43b | 1574 | |
525cd185 GP |
1575 | bh_lock_sock(chan->sk); |
1576 | l2cap_send_ack(chan); | |
1577 | bh_unlock_sock(chan->sk); | |
c1b4f43b GP |
1578 | } |
1579 | ||
525cd185 | 1580 | static inline void l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 1581 | { |
525cd185 GP |
1582 | struct sock *sk = chan->sk; |
1583 | ||
42e5c802 | 1584 | chan->expected_ack_seq = 0; |
6a026610 | 1585 | chan->unacked_frames = 0; |
42e5c802 | 1586 | chan->buffer_seq = 0; |
6a026610 GP |
1587 | chan->num_acked = 0; |
1588 | chan->frames_sent = 0; | |
0565c1c2 | 1589 | |
e92c8e70 GP |
1590 | setup_timer(&chan->retrans_timer, l2cap_retrans_timeout, |
1591 | (unsigned long) chan); | |
1592 | setup_timer(&chan->monitor_timer, l2cap_monitor_timeout, | |
1593 | (unsigned long) chan); | |
1594 | setup_timer(&chan->ack_timer, l2cap_ack_timeout, (unsigned long) chan); | |
0565c1c2 | 1595 | |
f1c6775b GP |
1596 | skb_queue_head_init(&chan->srej_q); |
1597 | skb_queue_head_init(&chan->busy_q); | |
1890d36b | 1598 | |
39d5a3ee GP |
1599 | INIT_LIST_HEAD(&chan->srej_l); |
1600 | ||
311bb895 | 1601 | INIT_WORK(&chan->busy_work, l2cap_busy_work); |
218bb9df GP |
1602 | |
1603 | sk->sk_backlog_rcv = l2cap_ertm_data_rcv; | |
0565c1c2 GP |
1604 | } |
1605 | ||
f2fcfcd6 GP |
1606 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
1607 | { | |
1608 | switch (mode) { | |
1609 | case L2CAP_MODE_STREAMING: | |
1610 | case L2CAP_MODE_ERTM: | |
1611 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
1612 | return mode; | |
1613 | /* fall through */ | |
1614 | default: | |
1615 | return L2CAP_MODE_BASIC; | |
1616 | } | |
1617 | } | |
1618 | ||
710f9b0a | 1619 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 1620 | { |
49208c9c | 1621 | struct l2cap_pinfo *pi = l2cap_pi(chan->sk); |
1da177e4 | 1622 | struct l2cap_conf_req *req = data; |
bd3c9e25 | 1623 | struct l2cap_conf_rfc rfc = { .mode = pi->mode }; |
1da177e4 LT |
1624 | void *ptr = req->data; |
1625 | ||
49208c9c | 1626 | BT_DBG("chan %p", chan); |
1da177e4 | 1627 | |
73ffa904 | 1628 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
1629 | goto done; |
1630 | ||
1631 | switch (pi->mode) { | |
1632 | case L2CAP_MODE_STREAMING: | |
1633 | case L2CAP_MODE_ERTM: | |
2ba13ed6 | 1634 | if (pi->conf_state & L2CAP_CONF_STATE2_DEVICE) |
85eb53c6 | 1635 | break; |
85eb53c6 | 1636 | |
2ba13ed6 | 1637 | /* fall through */ |
f2fcfcd6 GP |
1638 | default: |
1639 | pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); | |
1640 | break; | |
1641 | } | |
1642 | ||
1643 | done: | |
7990681c GP |
1644 | if (pi->imtu != L2CAP_DEFAULT_MTU) |
1645 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
1646 | ||
65c7c491 MH |
1647 | switch (pi->mode) { |
1648 | case L2CAP_MODE_BASIC: | |
63406504 GP |
1649 | if (!(pi->conn->feat_mask & L2CAP_FEAT_ERTM) && |
1650 | !(pi->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
1651 | break; | |
1652 | ||
62547752 GP |
1653 | rfc.mode = L2CAP_MODE_BASIC; |
1654 | rfc.txwin_size = 0; | |
1655 | rfc.max_transmit = 0; | |
1656 | rfc.retrans_timeout = 0; | |
1657 | rfc.monitor_timeout = 0; | |
1658 | rfc.max_pdu_size = 0; | |
1659 | ||
63406504 GP |
1660 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1661 | (unsigned long) &rfc); | |
65c7c491 MH |
1662 | break; |
1663 | ||
1664 | case L2CAP_MODE_ERTM: | |
1665 | rfc.mode = L2CAP_MODE_ERTM; | |
14b5aa71 | 1666 | rfc.txwin_size = pi->tx_win; |
68d7f0ce | 1667 | rfc.max_transmit = pi->max_tx; |
f2fcfcd6 GP |
1668 | rfc.retrans_timeout = 0; |
1669 | rfc.monitor_timeout = 0; | |
c74e560c | 1670 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 1671 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 1672 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
f2fcfcd6 | 1673 | |
63406504 GP |
1674 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1675 | (unsigned long) &rfc); | |
1676 | ||
fcc203c3 GP |
1677 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
1678 | break; | |
1679 | ||
1680 | if (pi->fcs == L2CAP_FCS_NONE || | |
1681 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
1682 | pi->fcs = L2CAP_FCS_NONE; | |
1683 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
1684 | } | |
f2fcfcd6 GP |
1685 | break; |
1686 | ||
1687 | case L2CAP_MODE_STREAMING: | |
1688 | rfc.mode = L2CAP_MODE_STREAMING; | |
1689 | rfc.txwin_size = 0; | |
1690 | rfc.max_transmit = 0; | |
1691 | rfc.retrans_timeout = 0; | |
1692 | rfc.monitor_timeout = 0; | |
c74e560c | 1693 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 1694 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 1695 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
65c7c491 | 1696 | |
63406504 GP |
1697 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1698 | (unsigned long) &rfc); | |
1699 | ||
fcc203c3 GP |
1700 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
1701 | break; | |
1702 | ||
1703 | if (pi->fcs == L2CAP_FCS_NONE || | |
1704 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
1705 | pi->fcs = L2CAP_FCS_NONE; | |
1706 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
1707 | } | |
65c7c491 MH |
1708 | break; |
1709 | } | |
1da177e4 | 1710 | |
aca3192c YH |
1711 | req->dcid = cpu_to_le16(pi->dcid); |
1712 | req->flags = cpu_to_le16(0); | |
1da177e4 LT |
1713 | |
1714 | return ptr - data; | |
1715 | } | |
1716 | ||
73ffa904 | 1717 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 1718 | { |
73ffa904 | 1719 | struct l2cap_pinfo *pi = l2cap_pi(chan->sk); |
5dee9e7c MH |
1720 | struct l2cap_conf_rsp *rsp = data; |
1721 | void *ptr = rsp->data; | |
73ffa904 GP |
1722 | void *req = chan->conf_req; |
1723 | int len = chan->conf_len; | |
5dee9e7c MH |
1724 | int type, hint, olen; |
1725 | unsigned long val; | |
6464f35f | 1726 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
861d6882 | 1727 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 1728 | u16 result = L2CAP_CONF_SUCCESS; |
1da177e4 | 1729 | |
73ffa904 | 1730 | BT_DBG("chan %p", chan); |
820ae1b8 | 1731 | |
5dee9e7c MH |
1732 | while (len >= L2CAP_CONF_OPT_SIZE) { |
1733 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 1734 | |
589d2746 | 1735 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 1736 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
1737 | |
1738 | switch (type) { | |
1739 | case L2CAP_CONF_MTU: | |
861d6882 | 1740 | mtu = val; |
5dee9e7c MH |
1741 | break; |
1742 | ||
1743 | case L2CAP_CONF_FLUSH_TO: | |
1744 | pi->flush_to = val; | |
1745 | break; | |
1746 | ||
1747 | case L2CAP_CONF_QOS: | |
1748 | break; | |
1749 | ||
6464f35f MH |
1750 | case L2CAP_CONF_RFC: |
1751 | if (olen == sizeof(rfc)) | |
1752 | memcpy(&rfc, (void *) val, olen); | |
1753 | break; | |
1754 | ||
fcc203c3 GP |
1755 | case L2CAP_CONF_FCS: |
1756 | if (val == L2CAP_FCS_NONE) | |
1757 | pi->conf_state |= L2CAP_CONF_NO_FCS_RECV; | |
1758 | ||
1759 | break; | |
1760 | ||
5dee9e7c MH |
1761 | default: |
1762 | if (hint) | |
1763 | break; | |
1764 | ||
1765 | result = L2CAP_CONF_UNKNOWN; | |
1766 | *((u8 *) ptr++) = type; | |
1767 | break; | |
1768 | } | |
1769 | } | |
1770 | ||
73ffa904 | 1771 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
1772 | goto done; |
1773 | ||
1774 | switch (pi->mode) { | |
1775 | case L2CAP_MODE_STREAMING: | |
1776 | case L2CAP_MODE_ERTM: | |
85eb53c6 GP |
1777 | if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) { |
1778 | pi->mode = l2cap_select_mode(rfc.mode, | |
1779 | pi->conn->feat_mask); | |
1780 | break; | |
1781 | } | |
1782 | ||
742e519b | 1783 | if (pi->mode != rfc.mode) |
f2fcfcd6 | 1784 | return -ECONNREFUSED; |
742e519b | 1785 | |
f2fcfcd6 | 1786 | break; |
f2fcfcd6 GP |
1787 | } |
1788 | ||
1789 | done: | |
1790 | if (pi->mode != rfc.mode) { | |
1791 | result = L2CAP_CONF_UNACCEPT; | |
1792 | rfc.mode = pi->mode; | |
1793 | ||
73ffa904 | 1794 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
1795 | return -ECONNREFUSED; |
1796 | ||
1797 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1798 | sizeof(rfc), (unsigned long) &rfc); | |
1799 | } | |
1800 | ||
1801 | ||
5dee9e7c MH |
1802 | if (result == L2CAP_CONF_SUCCESS) { |
1803 | /* Configure output options and let the other side know | |
1804 | * which ones we don't like. */ | |
1805 | ||
f2fcfcd6 GP |
1806 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
1807 | result = L2CAP_CONF_UNACCEPT; | |
1808 | else { | |
1809 | pi->omtu = mtu; | |
1810 | pi->conf_state |= L2CAP_CONF_MTU_DONE; | |
1811 | } | |
1812 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); | |
6464f35f | 1813 | |
f2fcfcd6 GP |
1814 | switch (rfc.mode) { |
1815 | case L2CAP_MODE_BASIC: | |
1816 | pi->fcs = L2CAP_FCS_NONE; | |
1817 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
1818 | break; | |
1819 | ||
1820 | case L2CAP_MODE_ERTM: | |
2c03a7a4 GP |
1821 | chan->remote_tx_win = rfc.txwin_size; |
1822 | chan->remote_max_tx = rfc.max_transmit; | |
86b1b263 MM |
1823 | |
1824 | if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) | |
1825 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); | |
1c762159 | 1826 | |
2c03a7a4 | 1827 | chan->remote_mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 | 1828 | |
10467e9e GP |
1829 | rfc.retrans_timeout = |
1830 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
1831 | rfc.monitor_timeout = | |
1832 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 GP |
1833 | |
1834 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
1835 | |
1836 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1837 | sizeof(rfc), (unsigned long) &rfc); | |
1838 | ||
f2fcfcd6 GP |
1839 | break; |
1840 | ||
1841 | case L2CAP_MODE_STREAMING: | |
86b1b263 MM |
1842 | if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) |
1843 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); | |
1c762159 | 1844 | |
2c03a7a4 | 1845 | chan->remote_mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
1846 | |
1847 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
1848 | |
1849 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1850 | sizeof(rfc), (unsigned long) &rfc); | |
1851 | ||
f2fcfcd6 GP |
1852 | break; |
1853 | ||
1854 | default: | |
5dee9e7c | 1855 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 1856 | |
6464f35f | 1857 | memset(&rfc, 0, sizeof(rfc)); |
f2fcfcd6 GP |
1858 | rfc.mode = pi->mode; |
1859 | } | |
6464f35f | 1860 | |
f2fcfcd6 GP |
1861 | if (result == L2CAP_CONF_SUCCESS) |
1862 | pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; | |
1863 | } | |
5dee9e7c MH |
1864 | rsp->scid = cpu_to_le16(pi->dcid); |
1865 | rsp->result = cpu_to_le16(result); | |
1866 | rsp->flags = cpu_to_le16(0x0000); | |
1867 | ||
1868 | return ptr - data; | |
1da177e4 LT |
1869 | } |
1870 | ||
f2fcfcd6 GP |
1871 | static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result) |
1872 | { | |
1873 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1874 | struct l2cap_conf_req *req = data; | |
1875 | void *ptr = req->data; | |
1876 | int type, olen; | |
1877 | unsigned long val; | |
1878 | struct l2cap_conf_rfc rfc; | |
1879 | ||
1880 | BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data); | |
1881 | ||
1882 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
1883 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
1884 | ||
1885 | switch (type) { | |
1886 | case L2CAP_CONF_MTU: | |
1887 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
1888 | *result = L2CAP_CONF_UNACCEPT; | |
8183b775 | 1889 | pi->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 1890 | } else |
8183b775 AE |
1891 | pi->imtu = val; |
1892 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
f2fcfcd6 GP |
1893 | break; |
1894 | ||
1895 | case L2CAP_CONF_FLUSH_TO: | |
1896 | pi->flush_to = val; | |
1897 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, | |
1898 | 2, pi->flush_to); | |
1899 | break; | |
1900 | ||
1901 | case L2CAP_CONF_RFC: | |
1902 | if (olen == sizeof(rfc)) | |
1903 | memcpy(&rfc, (void *)val, olen); | |
1904 | ||
1905 | if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) && | |
1906 | rfc.mode != pi->mode) | |
1907 | return -ECONNREFUSED; | |
1908 | ||
f2fcfcd6 GP |
1909 | pi->fcs = 0; |
1910 | ||
1911 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1912 | sizeof(rfc), (unsigned long) &rfc); | |
1913 | break; | |
1914 | } | |
1915 | } | |
1916 | ||
6c2ea7a8 GP |
1917 | if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode) |
1918 | return -ECONNREFUSED; | |
1919 | ||
1920 | pi->mode = rfc.mode; | |
1921 | ||
f2fcfcd6 GP |
1922 | if (*result == L2CAP_CONF_SUCCESS) { |
1923 | switch (rfc.mode) { | |
1924 | case L2CAP_MODE_ERTM: | |
10467e9e GP |
1925 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
1926 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
1c762159 | 1927 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
1928 | break; |
1929 | case L2CAP_MODE_STREAMING: | |
1c762159 | 1930 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
1931 | } |
1932 | } | |
1933 | ||
1934 | req->dcid = cpu_to_le16(pi->dcid); | |
1935 | req->flags = cpu_to_le16(0x0000); | |
1936 | ||
1937 | return ptr - data; | |
1938 | } | |
1939 | ||
5dee9e7c | 1940 | static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) |
1da177e4 LT |
1941 | { |
1942 | struct l2cap_conf_rsp *rsp = data; | |
1943 | void *ptr = rsp->data; | |
1da177e4 | 1944 | |
5dee9e7c | 1945 | BT_DBG("sk %p", sk); |
1da177e4 | 1946 | |
aca3192c | 1947 | rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
5dee9e7c | 1948 | rsp->result = cpu_to_le16(result); |
aca3192c | 1949 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
1950 | |
1951 | return ptr - data; | |
1952 | } | |
1953 | ||
710f9b0a GP |
1954 | void __l2cap_connect_rsp_defer(struct sock *sk) |
1955 | { | |
1956 | struct l2cap_conn_rsp rsp; | |
1957 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1958 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; | |
1959 | u8 buf[128]; | |
1960 | ||
1961 | sk->sk_state = BT_CONFIG; | |
1962 | ||
1963 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1964 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
1965 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
1966 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
1967 | l2cap_send_cmd(conn, chan->ident, | |
1968 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
1969 | ||
1970 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) | |
1971 | return; | |
1972 | ||
1973 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
1974 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
1975 | l2cap_build_conf_req(chan, buf), buf); | |
1976 | chan->num_conf_req++; | |
1977 | } | |
1978 | ||
7b1c0049 GP |
1979 | static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len) |
1980 | { | |
1981 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1982 | int type, olen; | |
1983 | unsigned long val; | |
1984 | struct l2cap_conf_rfc rfc; | |
1985 | ||
1986 | BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len); | |
1987 | ||
1988 | if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING)) | |
1989 | return; | |
1990 | ||
1991 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
1992 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
1993 | ||
1994 | switch (type) { | |
1995 | case L2CAP_CONF_RFC: | |
1996 | if (olen == sizeof(rfc)) | |
1997 | memcpy(&rfc, (void *)val, olen); | |
1998 | goto done; | |
1999 | } | |
2000 | } | |
2001 | ||
2002 | done: | |
2003 | switch (rfc.mode) { | |
2004 | case L2CAP_MODE_ERTM: | |
10467e9e GP |
2005 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2006 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
7b1c0049 GP |
2007 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
2008 | break; | |
2009 | case L2CAP_MODE_STREAMING: | |
2010 | pi->mps = le16_to_cpu(rfc.max_pdu_size); | |
2011 | } | |
2012 | } | |
2013 | ||
4e8402a3 MH |
2014 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2015 | { | |
2016 | struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; | |
2017 | ||
2018 | if (rej->reason != 0x0000) | |
2019 | return 0; | |
2020 | ||
2021 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2022 | cmd->ident == conn->info_ident) { | |
4e8402a3 | 2023 | del_timer(&conn->info_timer); |
984947dc MH |
2024 | |
2025 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2026 | conn->info_ident = 0; |
984947dc | 2027 | |
4e8402a3 MH |
2028 | l2cap_conn_start(conn); |
2029 | } | |
2030 | ||
2031 | return 0; | |
2032 | } | |
2033 | ||
1da177e4 LT |
2034 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2035 | { | |
1da177e4 LT |
2036 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
2037 | struct l2cap_conn_rsp rsp; | |
73ffa904 | 2038 | struct l2cap_chan *chan = NULL; |
d793fe8c | 2039 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 2040 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2041 | |
2042 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2043 | __le16 psm = req->psm; |
1da177e4 LT |
2044 | |
2045 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
2046 | ||
2047 | /* Check if we have socket listening on psm */ | |
2048 | parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); | |
2049 | if (!parent) { | |
2050 | result = L2CAP_CR_BAD_PSM; | |
2051 | goto sendresp; | |
2052 | } | |
2053 | ||
e0f0cb56 GP |
2054 | bh_lock_sock(parent); |
2055 | ||
e7c29cb1 MH |
2056 | /* Check if the ACL is secure enough (if not SDP) */ |
2057 | if (psm != cpu_to_le16(0x0001) && | |
2058 | !hci_conn_check_link_mode(conn->hcon)) { | |
2950f21a | 2059 | conn->disc_reason = 0x05; |
e7c29cb1 MH |
2060 | result = L2CAP_CR_SEC_BLOCK; |
2061 | goto response; | |
2062 | } | |
2063 | ||
1da177e4 LT |
2064 | result = L2CAP_CR_NO_MEM; |
2065 | ||
2066 | /* Check for backlog size */ | |
2067 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2068 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2069 | goto response; |
2070 | } | |
2071 | ||
3b1e0a65 | 2072 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); |
1da177e4 LT |
2073 | if (!sk) |
2074 | goto response; | |
2075 | ||
48454079 GP |
2076 | chan = l2cap_chan_alloc(sk); |
2077 | if (!chan) { | |
2078 | l2cap_sock_kill(sk); | |
2079 | goto response; | |
2080 | } | |
2081 | ||
baa7e1fa | 2082 | write_lock_bh(&conn->chan_lock); |
1da177e4 LT |
2083 | |
2084 | /* Check if we already have channel with that dcid */ | |
baa7e1fa GP |
2085 | if (__l2cap_get_chan_by_dcid(conn, scid)) { |
2086 | write_unlock_bh(&conn->chan_lock); | |
1da177e4 LT |
2087 | sock_set_flag(sk, SOCK_ZAPPED); |
2088 | l2cap_sock_kill(sk); | |
2089 | goto response; | |
2090 | } | |
2091 | ||
2092 | hci_conn_hold(conn->hcon); | |
2093 | ||
2094 | l2cap_sock_init(sk, parent); | |
2095 | bacpy(&bt_sk(sk)->src, conn->src); | |
2096 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
2097 | l2cap_pi(sk)->psm = psm; | |
2098 | l2cap_pi(sk)->dcid = scid; | |
2099 | ||
d1010240 GP |
2100 | bt_accept_enqueue(parent, sk); |
2101 | ||
48454079 GP |
2102 | __l2cap_chan_add(conn, chan); |
2103 | ||
2104 | l2cap_pi(sk)->chan = chan; | |
2105 | ||
1da177e4 LT |
2106 | dcid = l2cap_pi(sk)->scid; |
2107 | ||
2108 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
2109 | ||
fc7f8a7e | 2110 | chan->ident = cmd->ident; |
1da177e4 | 2111 | |
984947dc | 2112 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
2af6b9d5 | 2113 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
2114 | if (bt_sk(sk)->defer_setup) { |
2115 | sk->sk_state = BT_CONNECT2; | |
2116 | result = L2CAP_CR_PEND; | |
2117 | status = L2CAP_CS_AUTHOR_PEND; | |
2118 | parent->sk_data_ready(parent, 0); | |
2119 | } else { | |
2120 | sk->sk_state = BT_CONFIG; | |
2121 | result = L2CAP_CR_SUCCESS; | |
2122 | status = L2CAP_CS_NO_INFO; | |
2123 | } | |
79d554a6 MH |
2124 | } else { |
2125 | sk->sk_state = BT_CONNECT2; | |
2126 | result = L2CAP_CR_PEND; | |
2127 | status = L2CAP_CS_AUTHEN_PEND; | |
2128 | } | |
2129 | } else { | |
2130 | sk->sk_state = BT_CONNECT2; | |
2131 | result = L2CAP_CR_PEND; | |
2132 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2133 | } |
2134 | ||
baa7e1fa | 2135 | write_unlock_bh(&conn->chan_lock); |
1da177e4 LT |
2136 | |
2137 | response: | |
2138 | bh_unlock_sock(parent); | |
2139 | ||
2140 | sendresp: | |
aca3192c YH |
2141 | rsp.scid = cpu_to_le16(scid); |
2142 | rsp.dcid = cpu_to_le16(dcid); | |
2143 | rsp.result = cpu_to_le16(result); | |
2144 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2145 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2146 | |
2147 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2148 | struct l2cap_info_req info; | |
2149 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2150 | ||
2151 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2152 | conn->info_ident = l2cap_get_ident(conn); | |
2153 | ||
2154 | mod_timer(&conn->info_timer, jiffies + | |
2155 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
2156 | ||
2157 | l2cap_send_cmd(conn, conn->info_ident, | |
2158 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2159 | } | |
2160 | ||
73ffa904 | 2161 | if (chan && !(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) && |
e9aeb2dd GP |
2162 | result == L2CAP_CR_SUCCESS) { |
2163 | u8 buf[128]; | |
2164 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
2165 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
73ffa904 GP |
2166 | l2cap_build_conf_req(chan, buf), buf); |
2167 | chan->num_conf_req++; | |
e9aeb2dd GP |
2168 | } |
2169 | ||
1da177e4 LT |
2170 | return 0; |
2171 | } | |
2172 | ||
2173 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2174 | { | |
2175 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2176 | u16 scid, dcid, result, status; | |
48454079 | 2177 | struct l2cap_chan *chan; |
1da177e4 LT |
2178 | struct sock *sk; |
2179 | u8 req[128]; | |
2180 | ||
2181 | scid = __le16_to_cpu(rsp->scid); | |
2182 | dcid = __le16_to_cpu(rsp->dcid); | |
2183 | result = __le16_to_cpu(rsp->result); | |
2184 | status = __le16_to_cpu(rsp->status); | |
2185 | ||
2186 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2187 | ||
2188 | if (scid) { | |
baa7e1fa | 2189 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2190 | if (!chan) |
57d3b22b | 2191 | return -EFAULT; |
1da177e4 | 2192 | } else { |
baa7e1fa | 2193 | chan = l2cap_get_chan_by_ident(conn, cmd->ident); |
48454079 | 2194 | if (!chan) |
57d3b22b | 2195 | return -EFAULT; |
1da177e4 LT |
2196 | } |
2197 | ||
48454079 GP |
2198 | sk = chan->sk; |
2199 | ||
1da177e4 LT |
2200 | switch (result) { |
2201 | case L2CAP_CR_SUCCESS: | |
2202 | sk->sk_state = BT_CONFIG; | |
fc7f8a7e | 2203 | chan->ident = 0; |
1da177e4 | 2204 | l2cap_pi(sk)->dcid = dcid; |
6a8d3010 MH |
2205 | l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; |
2206 | ||
e9aeb2dd GP |
2207 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) |
2208 | break; | |
2209 | ||
2210 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
2211 | ||
1da177e4 | 2212 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2213 | l2cap_build_conf_req(chan, req), req); |
2214 | chan->num_conf_req++; | |
1da177e4 LT |
2215 | break; |
2216 | ||
2217 | case L2CAP_CR_PEND: | |
6a8d3010 | 2218 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 LT |
2219 | break; |
2220 | ||
2221 | default: | |
a49184c2 AE |
2222 | /* don't delete l2cap channel if sk is owned by user */ |
2223 | if (sock_owned_by_user(sk)) { | |
2224 | sk->sk_state = BT_DISCONN; | |
2225 | l2cap_sock_clear_timer(sk); | |
2226 | l2cap_sock_set_timer(sk, HZ / 5); | |
2227 | break; | |
2228 | } | |
2229 | ||
48454079 | 2230 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
2231 | break; |
2232 | } | |
2233 | ||
2234 | bh_unlock_sock(sk); | |
2235 | return 0; | |
2236 | } | |
2237 | ||
8c462b60 MM |
2238 | static inline void set_default_fcs(struct l2cap_pinfo *pi) |
2239 | { | |
2240 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
2241 | * sides request it. | |
2242 | */ | |
2243 | if (pi->mode != L2CAP_MODE_ERTM && pi->mode != L2CAP_MODE_STREAMING) | |
2244 | pi->fcs = L2CAP_FCS_NONE; | |
2245 | else if (!(pi->conf_state & L2CAP_CONF_NO_FCS_RECV)) | |
2246 | pi->fcs = L2CAP_FCS_CRC16; | |
2247 | } | |
2248 | ||
88219a0f | 2249 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
2250 | { |
2251 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
2252 | u16 dcid, flags; | |
2253 | u8 rsp[64]; | |
48454079 | 2254 | struct l2cap_chan *chan; |
1da177e4 | 2255 | struct sock *sk; |
5dee9e7c | 2256 | int len; |
1da177e4 LT |
2257 | |
2258 | dcid = __le16_to_cpu(req->dcid); | |
2259 | flags = __le16_to_cpu(req->flags); | |
2260 | ||
2261 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
2262 | ||
baa7e1fa | 2263 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2264 | if (!chan) |
1da177e4 LT |
2265 | return -ENOENT; |
2266 | ||
48454079 GP |
2267 | sk = chan->sk; |
2268 | ||
df6bd743 GP |
2269 | if (sk->sk_state != BT_CONFIG) { |
2270 | struct l2cap_cmd_rej rej; | |
2271 | ||
2272 | rej.reason = cpu_to_le16(0x0002); | |
2273 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, | |
2274 | sizeof(rej), &rej); | |
354f60a9 | 2275 | goto unlock; |
df6bd743 | 2276 | } |
354f60a9 | 2277 | |
5dee9e7c | 2278 | /* Reject if config buffer is too small. */ |
88219a0f | 2279 | len = cmd_len - sizeof(*req); |
73ffa904 | 2280 | if (chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c MH |
2281 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
2282 | l2cap_build_conf_rsp(sk, rsp, | |
2283 | L2CAP_CONF_REJECT, flags), rsp); | |
2284 | goto unlock; | |
2285 | } | |
2286 | ||
2287 | /* Store config. */ | |
73ffa904 GP |
2288 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
2289 | chan->conf_len += len; | |
1da177e4 LT |
2290 | |
2291 | if (flags & 0x0001) { | |
2292 | /* Incomplete config. Send empty response. */ | |
2293 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
5dee9e7c MH |
2294 | l2cap_build_conf_rsp(sk, rsp, |
2295 | L2CAP_CONF_SUCCESS, 0x0001), rsp); | |
1da177e4 LT |
2296 | goto unlock; |
2297 | } | |
2298 | ||
2299 | /* Complete config. */ | |
73ffa904 | 2300 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 2301 | if (len < 0) { |
e92c8e70 | 2302 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 2303 | goto unlock; |
f2fcfcd6 | 2304 | } |
1da177e4 | 2305 | |
5dee9e7c | 2306 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 2307 | chan->num_conf_rsp++; |
5dee9e7c | 2308 | |
5dee9e7c | 2309 | /* Reset config buffer. */ |
73ffa904 | 2310 | chan->conf_len = 0; |
5dee9e7c | 2311 | |
876d9484 MH |
2312 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) |
2313 | goto unlock; | |
2314 | ||
1da177e4 | 2315 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { |
8c462b60 | 2316 | set_default_fcs(l2cap_pi(sk)); |
fcc203c3 | 2317 | |
1da177e4 | 2318 | sk->sk_state = BT_CONNECTED; |
e90bac06 | 2319 | |
42e5c802 GP |
2320 | chan->next_tx_seq = 0; |
2321 | chan->expected_tx_seq = 0; | |
1c2acffb | 2322 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 | 2323 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
525cd185 | 2324 | l2cap_ertm_init(chan); |
0565c1c2 | 2325 | |
1da177e4 | 2326 | l2cap_chan_ready(sk); |
876d9484 MH |
2327 | goto unlock; |
2328 | } | |
2329 | ||
2330 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { | |
79d554a6 | 2331 | u8 buf[64]; |
ab3e5715 | 2332 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; |
1da177e4 | 2333 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2334 | l2cap_build_conf_req(chan, buf), buf); |
2335 | chan->num_conf_req++; | |
1da177e4 LT |
2336 | } |
2337 | ||
2338 | unlock: | |
2339 | bh_unlock_sock(sk); | |
2340 | return 0; | |
2341 | } | |
2342 | ||
2343 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2344 | { | |
2345 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
2346 | u16 scid, flags, result; | |
48454079 | 2347 | struct l2cap_chan *chan; |
1da177e4 | 2348 | struct sock *sk; |
7b1c0049 | 2349 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
2350 | |
2351 | scid = __le16_to_cpu(rsp->scid); | |
2352 | flags = __le16_to_cpu(rsp->flags); | |
2353 | result = __le16_to_cpu(rsp->result); | |
2354 | ||
af05b30b GP |
2355 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
2356 | scid, flags, result); | |
1da177e4 | 2357 | |
baa7e1fa | 2358 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2359 | if (!chan) |
1da177e4 LT |
2360 | return 0; |
2361 | ||
48454079 GP |
2362 | sk = chan->sk; |
2363 | ||
1da177e4 LT |
2364 | switch (result) { |
2365 | case L2CAP_CONF_SUCCESS: | |
7b1c0049 | 2366 | l2cap_conf_rfc_get(sk, rsp->data, len); |
1da177e4 LT |
2367 | break; |
2368 | ||
2369 | case L2CAP_CONF_UNACCEPT: | |
73ffa904 | 2370 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
2371 | char req[64]; |
2372 | ||
c2c77ec8 | 2373 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 2374 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
2375 | goto done; |
2376 | } | |
2377 | ||
f2fcfcd6 GP |
2378 | /* throw out any old stored conf requests */ |
2379 | result = L2CAP_CONF_SUCCESS; | |
2380 | len = l2cap_parse_conf_rsp(sk, rsp->data, | |
2381 | len, req, &result); | |
2382 | if (len < 0) { | |
e92c8e70 | 2383 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
2384 | goto done; |
2385 | } | |
2386 | ||
2387 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2388 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 2389 | chan->num_conf_req++; |
f2fcfcd6 GP |
2390 | if (result != L2CAP_CONF_SUCCESS) |
2391 | goto done; | |
2392 | break; | |
1da177e4 LT |
2393 | } |
2394 | ||
8e87d142 | 2395 | default: |
b1235d79 | 2396 | sk->sk_err = ECONNRESET; |
1da177e4 | 2397 | l2cap_sock_set_timer(sk, HZ * 5); |
e92c8e70 | 2398 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
2399 | goto done; |
2400 | } | |
2401 | ||
2402 | if (flags & 0x01) | |
2403 | goto done; | |
2404 | ||
1da177e4 LT |
2405 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; |
2406 | ||
2407 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { | |
8c462b60 | 2408 | set_default_fcs(l2cap_pi(sk)); |
fcc203c3 | 2409 | |
1da177e4 | 2410 | sk->sk_state = BT_CONNECTED; |
42e5c802 GP |
2411 | chan->next_tx_seq = 0; |
2412 | chan->expected_tx_seq = 0; | |
1c2acffb | 2413 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 | 2414 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
525cd185 | 2415 | l2cap_ertm_init(chan); |
0565c1c2 | 2416 | |
1da177e4 LT |
2417 | l2cap_chan_ready(sk); |
2418 | } | |
2419 | ||
2420 | done: | |
2421 | bh_unlock_sock(sk); | |
2422 | return 0; | |
2423 | } | |
2424 | ||
2425 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2426 | { | |
2427 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
2428 | struct l2cap_disconn_rsp rsp; | |
2429 | u16 dcid, scid; | |
48454079 | 2430 | struct l2cap_chan *chan; |
1da177e4 LT |
2431 | struct sock *sk; |
2432 | ||
2433 | scid = __le16_to_cpu(req->scid); | |
2434 | dcid = __le16_to_cpu(req->dcid); | |
2435 | ||
2436 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
2437 | ||
baa7e1fa | 2438 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2439 | if (!chan) |
1da177e4 LT |
2440 | return 0; |
2441 | ||
48454079 GP |
2442 | sk = chan->sk; |
2443 | ||
aca3192c YH |
2444 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); |
2445 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1da177e4 LT |
2446 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
2447 | ||
2448 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2449 | ||
a49184c2 AE |
2450 | /* don't delete l2cap channel if sk is owned by user */ |
2451 | if (sock_owned_by_user(sk)) { | |
2452 | sk->sk_state = BT_DISCONN; | |
2453 | l2cap_sock_clear_timer(sk); | |
2454 | l2cap_sock_set_timer(sk, HZ / 5); | |
2455 | bh_unlock_sock(sk); | |
2456 | return 0; | |
2457 | } | |
2458 | ||
48454079 | 2459 | l2cap_chan_del(chan, ECONNRESET); |
1da177e4 LT |
2460 | bh_unlock_sock(sk); |
2461 | ||
2462 | l2cap_sock_kill(sk); | |
2463 | return 0; | |
2464 | } | |
2465 | ||
2466 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2467 | { | |
2468 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
2469 | u16 dcid, scid; | |
48454079 | 2470 | struct l2cap_chan *chan; |
1da177e4 LT |
2471 | struct sock *sk; |
2472 | ||
2473 | scid = __le16_to_cpu(rsp->scid); | |
2474 | dcid = __le16_to_cpu(rsp->dcid); | |
2475 | ||
2476 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
2477 | ||
baa7e1fa | 2478 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2479 | if (!chan) |
1da177e4 LT |
2480 | return 0; |
2481 | ||
48454079 GP |
2482 | sk = chan->sk; |
2483 | ||
a49184c2 AE |
2484 | /* don't delete l2cap channel if sk is owned by user */ |
2485 | if (sock_owned_by_user(sk)) { | |
2486 | sk->sk_state = BT_DISCONN; | |
2487 | l2cap_sock_clear_timer(sk); | |
2488 | l2cap_sock_set_timer(sk, HZ / 5); | |
2489 | bh_unlock_sock(sk); | |
2490 | return 0; | |
2491 | } | |
2492 | ||
48454079 | 2493 | l2cap_chan_del(chan, 0); |
1da177e4 LT |
2494 | bh_unlock_sock(sk); |
2495 | ||
2496 | l2cap_sock_kill(sk); | |
2497 | return 0; | |
2498 | } | |
2499 | ||
2500 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2501 | { | |
2502 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
2503 | u16 type; |
2504 | ||
2505 | type = __le16_to_cpu(req->type); | |
2506 | ||
2507 | BT_DBG("type 0x%4.4x", type); | |
2508 | ||
f0709e03 MH |
2509 | if (type == L2CAP_IT_FEAT_MASK) { |
2510 | u8 buf[8]; | |
44dd46de | 2511 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
2512 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
2513 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2514 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 2515 | if (!disable_ertm) |
fcc203c3 GP |
2516 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2517 | | L2CAP_FEAT_FCS; | |
1b7bf4ed | 2518 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
2519 | l2cap_send_cmd(conn, cmd->ident, |
2520 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
2521 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
2522 | u8 buf[12]; | |
2523 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
2524 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2525 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
2526 | memcpy(buf + 4, l2cap_fixed_chan, 8); | |
2527 | l2cap_send_cmd(conn, cmd->ident, | |
2528 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
2529 | } else { |
2530 | struct l2cap_info_rsp rsp; | |
2531 | rsp.type = cpu_to_le16(type); | |
2532 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
2533 | l2cap_send_cmd(conn, cmd->ident, | |
2534 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
2535 | } | |
1da177e4 LT |
2536 | |
2537 | return 0; | |
2538 | } | |
2539 | ||
2540 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2541 | { | |
2542 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
2543 | u16 type, result; | |
2544 | ||
2545 | type = __le16_to_cpu(rsp->type); | |
2546 | result = __le16_to_cpu(rsp->result); | |
2547 | ||
2548 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
2549 | ||
e90165be AE |
2550 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
2551 | if (cmd->ident != conn->info_ident || | |
2552 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
2553 | return 0; | |
2554 | ||
4e8402a3 MH |
2555 | del_timer(&conn->info_timer); |
2556 | ||
adb08ede VT |
2557 | if (result != L2CAP_IR_SUCCESS) { |
2558 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2559 | conn->info_ident = 0; | |
2560 | ||
2561 | l2cap_conn_start(conn); | |
2562 | ||
2563 | return 0; | |
2564 | } | |
2565 | ||
984947dc | 2566 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 2567 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 2568 | |
47ec1dcd | 2569 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
2570 | struct l2cap_info_req req; |
2571 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2572 | ||
2573 | conn->info_ident = l2cap_get_ident(conn); | |
2574 | ||
2575 | l2cap_send_cmd(conn, conn->info_ident, | |
2576 | L2CAP_INFO_REQ, sizeof(req), &req); | |
2577 | } else { | |
2578 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2579 | conn->info_ident = 0; | |
2580 | ||
2581 | l2cap_conn_start(conn); | |
2582 | } | |
2583 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 2584 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 2585 | conn->info_ident = 0; |
984947dc MH |
2586 | |
2587 | l2cap_conn_start(conn); | |
2588 | } | |
4e8402a3 | 2589 | |
1da177e4 LT |
2590 | return 0; |
2591 | } | |
2592 | ||
e2174ca4 | 2593 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
2594 | u16 to_multiplier) |
2595 | { | |
2596 | u16 max_latency; | |
2597 | ||
2598 | if (min > max || min < 6 || max > 3200) | |
2599 | return -EINVAL; | |
2600 | ||
2601 | if (to_multiplier < 10 || to_multiplier > 3200) | |
2602 | return -EINVAL; | |
2603 | ||
2604 | if (max >= to_multiplier * 8) | |
2605 | return -EINVAL; | |
2606 | ||
2607 | max_latency = (to_multiplier * 8 / max) - 1; | |
2608 | if (latency > 499 || latency > max_latency) | |
2609 | return -EINVAL; | |
2610 | ||
2611 | return 0; | |
2612 | } | |
2613 | ||
2614 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
2615 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
2616 | { | |
2617 | struct hci_conn *hcon = conn->hcon; | |
2618 | struct l2cap_conn_param_update_req *req; | |
2619 | struct l2cap_conn_param_update_rsp rsp; | |
2620 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 2621 | int err; |
de73115a CT |
2622 | |
2623 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
2624 | return -EINVAL; | |
2625 | ||
2626 | cmd_len = __le16_to_cpu(cmd->len); | |
2627 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
2628 | return -EPROTO; | |
2629 | ||
2630 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
2631 | min = __le16_to_cpu(req->min); |
2632 | max = __le16_to_cpu(req->max); | |
de73115a CT |
2633 | latency = __le16_to_cpu(req->latency); |
2634 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
2635 | ||
2636 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2637 | min, max, latency, to_multiplier); | |
2638 | ||
2639 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
2640 | |
2641 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
2642 | if (err) | |
de73115a CT |
2643 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
2644 | else | |
2645 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); | |
2646 | ||
2647 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2648 | sizeof(rsp), &rsp); | |
2649 | ||
2ce603eb CT |
2650 | if (!err) |
2651 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
2652 | ||
de73115a CT |
2653 | return 0; |
2654 | } | |
2655 | ||
3300d9a9 CT |
2656 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2657 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
2658 | { | |
2659 | int err = 0; | |
2660 | ||
2661 | switch (cmd->code) { | |
2662 | case L2CAP_COMMAND_REJ: | |
2663 | l2cap_command_rej(conn, cmd, data); | |
2664 | break; | |
2665 | ||
2666 | case L2CAP_CONN_REQ: | |
2667 | err = l2cap_connect_req(conn, cmd, data); | |
2668 | break; | |
2669 | ||
2670 | case L2CAP_CONN_RSP: | |
2671 | err = l2cap_connect_rsp(conn, cmd, data); | |
2672 | break; | |
2673 | ||
2674 | case L2CAP_CONF_REQ: | |
2675 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
2676 | break; | |
2677 | ||
2678 | case L2CAP_CONF_RSP: | |
2679 | err = l2cap_config_rsp(conn, cmd, data); | |
2680 | break; | |
2681 | ||
2682 | case L2CAP_DISCONN_REQ: | |
2683 | err = l2cap_disconnect_req(conn, cmd, data); | |
2684 | break; | |
2685 | ||
2686 | case L2CAP_DISCONN_RSP: | |
2687 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
2688 | break; | |
2689 | ||
2690 | case L2CAP_ECHO_REQ: | |
2691 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
2692 | break; | |
2693 | ||
2694 | case L2CAP_ECHO_RSP: | |
2695 | break; | |
2696 | ||
2697 | case L2CAP_INFO_REQ: | |
2698 | err = l2cap_information_req(conn, cmd, data); | |
2699 | break; | |
2700 | ||
2701 | case L2CAP_INFO_RSP: | |
2702 | err = l2cap_information_rsp(conn, cmd, data); | |
2703 | break; | |
2704 | ||
2705 | default: | |
2706 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
2707 | err = -EINVAL; | |
2708 | break; | |
2709 | } | |
2710 | ||
2711 | return err; | |
2712 | } | |
2713 | ||
2714 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
2715 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
2716 | { | |
2717 | switch (cmd->code) { | |
2718 | case L2CAP_COMMAND_REJ: | |
2719 | return 0; | |
2720 | ||
2721 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 2722 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
2723 | |
2724 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
2725 | return 0; | |
2726 | ||
2727 | default: | |
2728 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
2729 | return -EINVAL; | |
2730 | } | |
2731 | } | |
2732 | ||
2733 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
2734 | struct sk_buff *skb) | |
1da177e4 LT |
2735 | { |
2736 | u8 *data = skb->data; | |
2737 | int len = skb->len; | |
2738 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 2739 | int err; |
1da177e4 LT |
2740 | |
2741 | l2cap_raw_recv(conn, skb); | |
2742 | ||
2743 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 2744 | u16 cmd_len; |
1da177e4 LT |
2745 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
2746 | data += L2CAP_CMD_HDR_SIZE; | |
2747 | len -= L2CAP_CMD_HDR_SIZE; | |
2748 | ||
88219a0f | 2749 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 2750 | |
88219a0f | 2751 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 2752 | |
88219a0f | 2753 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
2754 | BT_DBG("corrupted command"); |
2755 | break; | |
2756 | } | |
2757 | ||
3300d9a9 CT |
2758 | if (conn->hcon->type == LE_LINK) |
2759 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
2760 | else | |
2761 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
2762 | |
2763 | if (err) { | |
2764 | struct l2cap_cmd_rej rej; | |
2c6d1a2e GP |
2765 | |
2766 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
2767 | |
2768 | /* FIXME: Map err to a valid reason */ | |
aca3192c | 2769 | rej.reason = cpu_to_le16(0); |
1da177e4 LT |
2770 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
2771 | } | |
2772 | ||
88219a0f AV |
2773 | data += cmd_len; |
2774 | len -= cmd_len; | |
1da177e4 LT |
2775 | } |
2776 | ||
2777 | kfree_skb(skb); | |
2778 | } | |
2779 | ||
fcc203c3 GP |
2780 | static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb) |
2781 | { | |
2782 | u16 our_fcs, rcv_fcs; | |
2783 | int hdr_size = L2CAP_HDR_SIZE + 2; | |
2784 | ||
2785 | if (pi->fcs == L2CAP_FCS_CRC16) { | |
2786 | skb_trim(skb, skb->len - 2); | |
2787 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); | |
2788 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
2789 | ||
2790 | if (our_fcs != rcv_fcs) | |
7a560e5c | 2791 | return -EBADMSG; |
fcc203c3 GP |
2792 | } |
2793 | return 0; | |
2794 | } | |
2795 | ||
525cd185 | 2796 | static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 2797 | { |
d5392c8f GP |
2798 | u16 control = 0; |
2799 | ||
6a026610 | 2800 | chan->frames_sent = 0; |
d5392c8f | 2801 | |
42e5c802 | 2802 | control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
d5392c8f | 2803 | |
525cd185 | 2804 | if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
64988868 | 2805 | control |= L2CAP_SUPER_RCV_NOT_READY; |
525cd185 GP |
2806 | l2cap_send_sframe(chan, control); |
2807 | chan->conn_state |= L2CAP_CONN_RNR_SENT; | |
d5392c8f GP |
2808 | } |
2809 | ||
525cd185 GP |
2810 | if (chan->conn_state & L2CAP_CONN_REMOTE_BUSY) |
2811 | l2cap_retransmit_frames(chan); | |
d5392c8f | 2812 | |
525cd185 | 2813 | l2cap_ertm_send(chan); |
d5392c8f | 2814 | |
525cd185 | 2815 | if (!(chan->conn_state & L2CAP_CONN_LOCAL_BUSY) && |
6a026610 | 2816 | chan->frames_sent == 0) { |
d5392c8f | 2817 | control |= L2CAP_SUPER_RCV_READY; |
525cd185 | 2818 | l2cap_send_sframe(chan, control); |
d5392c8f GP |
2819 | } |
2820 | } | |
2821 | ||
42e5c802 | 2822 | static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u8 tx_seq, u8 sar) |
8f17154f GP |
2823 | { |
2824 | struct sk_buff *next_skb; | |
bfbacc11 | 2825 | int tx_seq_offset, next_tx_seq_offset; |
8f17154f GP |
2826 | |
2827 | bt_cb(skb)->tx_seq = tx_seq; | |
2828 | bt_cb(skb)->sar = sar; | |
2829 | ||
f1c6775b | 2830 | next_skb = skb_peek(&chan->srej_q); |
8f17154f | 2831 | if (!next_skb) { |
f1c6775b | 2832 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d | 2833 | return 0; |
8f17154f GP |
2834 | } |
2835 | ||
42e5c802 | 2836 | tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; |
bfbacc11 JPRV |
2837 | if (tx_seq_offset < 0) |
2838 | tx_seq_offset += 64; | |
2839 | ||
8f17154f | 2840 | do { |
9b53350d JPRV |
2841 | if (bt_cb(next_skb)->tx_seq == tx_seq) |
2842 | return -EINVAL; | |
2843 | ||
bfbacc11 | 2844 | next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - |
42e5c802 | 2845 | chan->buffer_seq) % 64; |
bfbacc11 JPRV |
2846 | if (next_tx_seq_offset < 0) |
2847 | next_tx_seq_offset += 64; | |
2848 | ||
2849 | if (next_tx_seq_offset > tx_seq_offset) { | |
f1c6775b | 2850 | __skb_queue_before(&chan->srej_q, next_skb, skb); |
9b53350d | 2851 | return 0; |
8f17154f GP |
2852 | } |
2853 | ||
f1c6775b | 2854 | if (skb_queue_is_last(&chan->srej_q, next_skb)) |
8f17154f GP |
2855 | break; |
2856 | ||
f1c6775b | 2857 | } while ((next_skb = skb_queue_next(&chan->srej_q, next_skb))); |
8f17154f | 2858 | |
f1c6775b | 2859 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d JPRV |
2860 | |
2861 | return 0; | |
8f17154f GP |
2862 | } |
2863 | ||
525cd185 | 2864 | static int l2cap_ertm_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) |
18778a63 | 2865 | { |
525cd185 | 2866 | struct l2cap_pinfo *pi = l2cap_pi(chan->sk); |
18778a63 | 2867 | struct sk_buff *_skb; |
1890d36b | 2868 | int err; |
18778a63 GP |
2869 | |
2870 | switch (control & L2CAP_CTRL_SAR) { | |
2871 | case L2CAP_SDU_UNSEGMENTED: | |
525cd185 | 2872 | if (chan->conn_state & L2CAP_CONN_SAR_SDU) |
18778a63 GP |
2873 | goto drop; |
2874 | ||
525cd185 | 2875 | err = sock_queue_rcv_skb(chan->sk, skb); |
18778a63 GP |
2876 | if (!err) |
2877 | return err; | |
2878 | ||
2879 | break; | |
2880 | ||
2881 | case L2CAP_SDU_START: | |
525cd185 | 2882 | if (chan->conn_state & L2CAP_CONN_SAR_SDU) |
18778a63 GP |
2883 | goto drop; |
2884 | ||
6f61fd47 | 2885 | chan->sdu_len = get_unaligned_le16(skb->data); |
18778a63 | 2886 | |
6f61fd47 | 2887 | if (chan->sdu_len > pi->imtu) |
18778a63 GP |
2888 | goto disconnect; |
2889 | ||
6f61fd47 GP |
2890 | chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC); |
2891 | if (!chan->sdu) | |
1890d36b GP |
2892 | return -ENOMEM; |
2893 | ||
2894 | /* pull sdu_len bytes only after alloc, because of Local Busy | |
2895 | * condition we have to be sure that this will be executed | |
2896 | * only once, i.e., when alloc does not fail */ | |
2897 | skb_pull(skb, 2); | |
18778a63 | 2898 | |
6f61fd47 | 2899 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
18778a63 | 2900 | |
525cd185 | 2901 | chan->conn_state |= L2CAP_CONN_SAR_SDU; |
6f61fd47 | 2902 | chan->partial_sdu_len = skb->len; |
18778a63 GP |
2903 | break; |
2904 | ||
2905 | case L2CAP_SDU_CONTINUE: | |
525cd185 | 2906 | if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) |
18778a63 GP |
2907 | goto disconnect; |
2908 | ||
6f61fd47 | 2909 | if (!chan->sdu) |
18778a63 GP |
2910 | goto disconnect; |
2911 | ||
6f61fd47 GP |
2912 | chan->partial_sdu_len += skb->len; |
2913 | if (chan->partial_sdu_len > chan->sdu_len) | |
18778a63 GP |
2914 | goto drop; |
2915 | ||
6f61fd47 | 2916 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
4178ba46 | 2917 | |
18778a63 GP |
2918 | break; |
2919 | ||
2920 | case L2CAP_SDU_END: | |
525cd185 | 2921 | if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) |
18778a63 GP |
2922 | goto disconnect; |
2923 | ||
6f61fd47 | 2924 | if (!chan->sdu) |
18778a63 GP |
2925 | goto disconnect; |
2926 | ||
525cd185 | 2927 | if (!(chan->conn_state & L2CAP_CONN_SAR_RETRY)) { |
6f61fd47 | 2928 | chan->partial_sdu_len += skb->len; |
18778a63 | 2929 | |
6f61fd47 | 2930 | if (chan->partial_sdu_len > pi->imtu) |
1890d36b | 2931 | goto drop; |
18778a63 | 2932 | |
6f61fd47 | 2933 | if (chan->partial_sdu_len != chan->sdu_len) |
1890d36b | 2934 | goto drop; |
4178ba46 | 2935 | |
6f61fd47 | 2936 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
1890d36b | 2937 | } |
18778a63 | 2938 | |
6f61fd47 | 2939 | _skb = skb_clone(chan->sdu, GFP_ATOMIC); |
1890d36b | 2940 | if (!_skb) { |
525cd185 | 2941 | chan->conn_state |= L2CAP_CONN_SAR_RETRY; |
1890d36b GP |
2942 | return -ENOMEM; |
2943 | } | |
2944 | ||
525cd185 | 2945 | err = sock_queue_rcv_skb(chan->sk, _skb); |
1890d36b | 2946 | if (err < 0) { |
18778a63 | 2947 | kfree_skb(_skb); |
525cd185 | 2948 | chan->conn_state |= L2CAP_CONN_SAR_RETRY; |
1890d36b GP |
2949 | return err; |
2950 | } | |
2951 | ||
525cd185 GP |
2952 | chan->conn_state &= ~L2CAP_CONN_SAR_RETRY; |
2953 | chan->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
18778a63 | 2954 | |
6f61fd47 | 2955 | kfree_skb(chan->sdu); |
18778a63 GP |
2956 | break; |
2957 | } | |
2958 | ||
2959 | kfree_skb(skb); | |
1890d36b | 2960 | return 0; |
18778a63 GP |
2961 | |
2962 | drop: | |
6f61fd47 GP |
2963 | kfree_skb(chan->sdu); |
2964 | chan->sdu = NULL; | |
18778a63 GP |
2965 | |
2966 | disconnect: | |
e92c8e70 | 2967 | l2cap_send_disconn_req(pi->conn, chan, ECONNRESET); |
18778a63 GP |
2968 | kfree_skb(skb); |
2969 | return 0; | |
2970 | } | |
2971 | ||
525cd185 | 2972 | static int l2cap_try_push_rx_skb(struct l2cap_chan *chan) |
712132eb | 2973 | { |
712132eb GP |
2974 | struct sk_buff *skb; |
2975 | u16 control; | |
2976 | int err; | |
2977 | ||
f1c6775b | 2978 | while ((skb = skb_dequeue(&chan->busy_q))) { |
712132eb | 2979 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
525cd185 | 2980 | err = l2cap_ertm_reassembly_sdu(chan, skb, control); |
712132eb | 2981 | if (err < 0) { |
f1c6775b | 2982 | skb_queue_head(&chan->busy_q, skb); |
712132eb GP |
2983 | return -EBUSY; |
2984 | } | |
2985 | ||
42e5c802 | 2986 | chan->buffer_seq = (chan->buffer_seq + 1) % 64; |
712132eb GP |
2987 | } |
2988 | ||
525cd185 | 2989 | if (!(chan->conn_state & L2CAP_CONN_RNR_SENT)) |
712132eb GP |
2990 | goto done; |
2991 | ||
42e5c802 | 2992 | control = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
712132eb | 2993 | control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; |
525cd185 | 2994 | l2cap_send_sframe(chan, control); |
6a026610 | 2995 | chan->retry_count = 1; |
712132eb | 2996 | |
e92c8e70 | 2997 | del_timer(&chan->retrans_timer); |
712132eb GP |
2998 | __mod_monitor_timer(); |
2999 | ||
525cd185 | 3000 | chan->conn_state |= L2CAP_CONN_WAIT_F; |
712132eb GP |
3001 | |
3002 | done: | |
525cd185 GP |
3003 | chan->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; |
3004 | chan->conn_state &= ~L2CAP_CONN_RNR_SENT; | |
712132eb | 3005 | |
49208c9c | 3006 | BT_DBG("chan %p, Exit local busy", chan); |
712132eb GP |
3007 | |
3008 | return 0; | |
3009 | } | |
3010 | ||
1890d36b GP |
3011 | static void l2cap_busy_work(struct work_struct *work) |
3012 | { | |
3013 | DECLARE_WAITQUEUE(wait, current); | |
311bb895 GP |
3014 | struct l2cap_chan *chan = |
3015 | container_of(work, struct l2cap_chan, busy_work); | |
3016 | struct sock *sk = chan->sk; | |
1890d36b GP |
3017 | int n_tries = 0, timeo = HZ/5, err; |
3018 | struct sk_buff *skb; | |
1890d36b GP |
3019 | |
3020 | lock_sock(sk); | |
3021 | ||
2b0b05dd | 3022 | add_wait_queue(sk_sleep(sk), &wait); |
311bb895 | 3023 | while ((skb = skb_peek(&chan->busy_q))) { |
1890d36b GP |
3024 | set_current_state(TASK_INTERRUPTIBLE); |
3025 | ||
3026 | if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { | |
3027 | err = -EBUSY; | |
311bb895 | 3028 | l2cap_send_disconn_req(l2cap_pi(sk)->conn, chan, EBUSY); |
712132eb | 3029 | break; |
1890d36b GP |
3030 | } |
3031 | ||
3032 | if (!timeo) | |
3033 | timeo = HZ/5; | |
3034 | ||
3035 | if (signal_pending(current)) { | |
3036 | err = sock_intr_errno(timeo); | |
712132eb | 3037 | break; |
1890d36b GP |
3038 | } |
3039 | ||
3040 | release_sock(sk); | |
3041 | timeo = schedule_timeout(timeo); | |
3042 | lock_sock(sk); | |
3043 | ||
3044 | err = sock_error(sk); | |
3045 | if (err) | |
712132eb | 3046 | break; |
1890d36b | 3047 | |
311bb895 | 3048 | if (l2cap_try_push_rx_skb(chan) == 0) |
1890d36b GP |
3049 | break; |
3050 | } | |
3051 | ||
1890d36b | 3052 | set_current_state(TASK_RUNNING); |
2b0b05dd | 3053 | remove_wait_queue(sk_sleep(sk), &wait); |
1890d36b GP |
3054 | |
3055 | release_sock(sk); | |
3056 | } | |
3057 | ||
525cd185 | 3058 | static int l2cap_push_rx_skb(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) |
1890d36b | 3059 | { |
1890d36b GP |
3060 | int sctrl, err; |
3061 | ||
525cd185 | 3062 | if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
1890d36b | 3063 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; |
f1c6775b | 3064 | __skb_queue_tail(&chan->busy_q, skb); |
525cd185 | 3065 | return l2cap_try_push_rx_skb(chan); |
712132eb GP |
3066 | |
3067 | ||
1890d36b GP |
3068 | } |
3069 | ||
525cd185 | 3070 | err = l2cap_ertm_reassembly_sdu(chan, skb, control); |
1890d36b | 3071 | if (err >= 0) { |
42e5c802 | 3072 | chan->buffer_seq = (chan->buffer_seq + 1) % 64; |
1890d36b GP |
3073 | return err; |
3074 | } | |
3075 | ||
3076 | /* Busy Condition */ | |
311bb895 | 3077 | BT_DBG("chan %p, Enter local busy", chan); |
0e98958d | 3078 | |
525cd185 | 3079 | chan->conn_state |= L2CAP_CONN_LOCAL_BUSY; |
1890d36b | 3080 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; |
f1c6775b | 3081 | __skb_queue_tail(&chan->busy_q, skb); |
1890d36b | 3082 | |
42e5c802 | 3083 | sctrl = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
1890d36b | 3084 | sctrl |= L2CAP_SUPER_RCV_NOT_READY; |
525cd185 | 3085 | l2cap_send_sframe(chan, sctrl); |
1890d36b | 3086 | |
525cd185 | 3087 | chan->conn_state |= L2CAP_CONN_RNR_SENT; |
1890d36b | 3088 | |
e92c8e70 | 3089 | del_timer(&chan->ack_timer); |
7fe9b298 | 3090 | |
311bb895 | 3091 | queue_work(_busy_wq, &chan->busy_work); |
1890d36b GP |
3092 | |
3093 | return err; | |
3094 | } | |
3095 | ||
525cd185 | 3096 | static int l2cap_streaming_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) |
c74e560c | 3097 | { |
525cd185 | 3098 | struct l2cap_pinfo *pi = l2cap_pi(chan->sk); |
c74e560c GP |
3099 | struct sk_buff *_skb; |
3100 | int err = -EINVAL; | |
3101 | ||
18778a63 GP |
3102 | /* |
3103 | * TODO: We have to notify the userland if some data is lost with the | |
3104 | * Streaming Mode. | |
3105 | */ | |
3106 | ||
c74e560c GP |
3107 | switch (control & L2CAP_CTRL_SAR) { |
3108 | case L2CAP_SDU_UNSEGMENTED: | |
525cd185 | 3109 | if (chan->conn_state & L2CAP_CONN_SAR_SDU) { |
6f61fd47 | 3110 | kfree_skb(chan->sdu); |
c74e560c GP |
3111 | break; |
3112 | } | |
3113 | ||
525cd185 | 3114 | err = sock_queue_rcv_skb(chan->sk, skb); |
c74e560c GP |
3115 | if (!err) |
3116 | return 0; | |
3117 | ||
3118 | break; | |
3119 | ||
3120 | case L2CAP_SDU_START: | |
525cd185 | 3121 | if (chan->conn_state & L2CAP_CONN_SAR_SDU) { |
6f61fd47 | 3122 | kfree_skb(chan->sdu); |
c74e560c GP |
3123 | break; |
3124 | } | |
3125 | ||
6f61fd47 | 3126 | chan->sdu_len = get_unaligned_le16(skb->data); |
c74e560c GP |
3127 | skb_pull(skb, 2); |
3128 | ||
6f61fd47 | 3129 | if (chan->sdu_len > pi->imtu) { |
052897ca GP |
3130 | err = -EMSGSIZE; |
3131 | break; | |
3132 | } | |
3133 | ||
6f61fd47 GP |
3134 | chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC); |
3135 | if (!chan->sdu) { | |
c74e560c GP |
3136 | err = -ENOMEM; |
3137 | break; | |
3138 | } | |
3139 | ||
6f61fd47 | 3140 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
c74e560c | 3141 | |
525cd185 | 3142 | chan->conn_state |= L2CAP_CONN_SAR_SDU; |
6f61fd47 | 3143 | chan->partial_sdu_len = skb->len; |
c74e560c GP |
3144 | err = 0; |
3145 | break; | |
3146 | ||
3147 | case L2CAP_SDU_CONTINUE: | |
525cd185 | 3148 | if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) |
c74e560c GP |
3149 | break; |
3150 | ||
6f61fd47 | 3151 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
c74e560c | 3152 | |
6f61fd47 GP |
3153 | chan->partial_sdu_len += skb->len; |
3154 | if (chan->partial_sdu_len > chan->sdu_len) | |
3155 | kfree_skb(chan->sdu); | |
c74e560c GP |
3156 | else |
3157 | err = 0; | |
3158 | ||
3159 | break; | |
3160 | ||
3161 | case L2CAP_SDU_END: | |
525cd185 | 3162 | if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) |
c74e560c GP |
3163 | break; |
3164 | ||
6f61fd47 | 3165 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
c74e560c | 3166 | |
525cd185 | 3167 | chan->conn_state &= ~L2CAP_CONN_SAR_SDU; |
6f61fd47 | 3168 | chan->partial_sdu_len += skb->len; |
c74e560c | 3169 | |
6f61fd47 | 3170 | if (chan->partial_sdu_len > pi->imtu) |
36f2fd58 GP |
3171 | goto drop; |
3172 | ||
6f61fd47 GP |
3173 | if (chan->partial_sdu_len == chan->sdu_len) { |
3174 | _skb = skb_clone(chan->sdu, GFP_ATOMIC); | |
525cd185 | 3175 | err = sock_queue_rcv_skb(chan->sk, _skb); |
c74e560c GP |
3176 | if (err < 0) |
3177 | kfree_skb(_skb); | |
3178 | } | |
c74e560c GP |
3179 | err = 0; |
3180 | ||
36f2fd58 | 3181 | drop: |
6f61fd47 | 3182 | kfree_skb(chan->sdu); |
c74e560c GP |
3183 | break; |
3184 | } | |
3185 | ||
3186 | kfree_skb(skb); | |
3187 | return err; | |
3188 | } | |
3189 | ||
525cd185 | 3190 | static void l2cap_check_srej_gap(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f GP |
3191 | { |
3192 | struct sk_buff *skb; | |
afefdbc4 | 3193 | u16 control; |
8f17154f | 3194 | |
f1c6775b | 3195 | while ((skb = skb_peek(&chan->srej_q))) { |
8f17154f GP |
3196 | if (bt_cb(skb)->tx_seq != tx_seq) |
3197 | break; | |
3198 | ||
f1c6775b | 3199 | skb = skb_dequeue(&chan->srej_q); |
afefdbc4 | 3200 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
525cd185 | 3201 | l2cap_ertm_reassembly_sdu(chan, skb, control); |
42e5c802 GP |
3202 | chan->buffer_seq_srej = |
3203 | (chan->buffer_seq_srej + 1) % 64; | |
8ff50ec0 | 3204 | tx_seq = (tx_seq + 1) % 64; |
8f17154f GP |
3205 | } |
3206 | } | |
3207 | ||
525cd185 | 3208 | static void l2cap_resend_srejframe(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f | 3209 | { |
8f17154f GP |
3210 | struct srej_list *l, *tmp; |
3211 | u16 control; | |
3212 | ||
39d5a3ee | 3213 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
8f17154f GP |
3214 | if (l->tx_seq == tx_seq) { |
3215 | list_del(&l->list); | |
3216 | kfree(l); | |
3217 | return; | |
3218 | } | |
3219 | control = L2CAP_SUPER_SELECT_REJECT; | |
3220 | control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
525cd185 | 3221 | l2cap_send_sframe(chan, control); |
8f17154f | 3222 | list_del(&l->list); |
39d5a3ee | 3223 | list_add_tail(&l->list, &chan->srej_l); |
8f17154f GP |
3224 | } |
3225 | } | |
3226 | ||
525cd185 | 3227 | static void l2cap_send_srejframe(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f | 3228 | { |
8f17154f GP |
3229 | struct srej_list *new; |
3230 | u16 control; | |
3231 | ||
42e5c802 | 3232 | while (tx_seq != chan->expected_tx_seq) { |
8f17154f | 3233 | control = L2CAP_SUPER_SELECT_REJECT; |
42e5c802 | 3234 | control |= chan->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
525cd185 | 3235 | l2cap_send_sframe(chan, control); |
8f17154f GP |
3236 | |
3237 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
42e5c802 GP |
3238 | new->tx_seq = chan->expected_tx_seq; |
3239 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; | |
39d5a3ee | 3240 | list_add_tail(&new->list, &chan->srej_l); |
8f17154f | 3241 | } |
42e5c802 | 3242 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; |
8f17154f GP |
3243 | } |
3244 | ||
525cd185 | 3245 | static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) |
1c2acffb | 3246 | { |
49208c9c | 3247 | struct l2cap_pinfo *pi = l2cap_pi(chan->sk); |
1c2acffb | 3248 | u8 tx_seq = __get_txseq(rx_control); |
9f121a5a | 3249 | u8 req_seq = __get_reqseq(rx_control); |
8f17154f | 3250 | u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; |
f6337c77 | 3251 | int tx_seq_offset, expected_tx_seq_offset; |
803020c6 | 3252 | int num_to_ack = (pi->tx_win/6) + 1; |
1c2acffb GP |
3253 | int err = 0; |
3254 | ||
525cd185 GP |
3255 | BT_DBG("chan %p len %d tx_seq %d rx_control 0x%4.4x", chan, skb->len, |
3256 | tx_seq, rx_control); | |
1c2acffb | 3257 | |
9b16dc65 | 3258 | if (L2CAP_CTRL_FINAL & rx_control && |
525cd185 | 3259 | chan->conn_state & L2CAP_CONN_WAIT_F) { |
e92c8e70 | 3260 | del_timer(&chan->monitor_timer); |
6a026610 | 3261 | if (chan->unacked_frames > 0) |
1d8f5d16 | 3262 | __mod_retrans_timer(); |
525cd185 | 3263 | chan->conn_state &= ~L2CAP_CONN_WAIT_F; |
1d8f5d16 GP |
3264 | } |
3265 | ||
42e5c802 GP |
3266 | chan->expected_ack_seq = req_seq; |
3267 | l2cap_drop_acked_frames(chan); | |
9f121a5a | 3268 | |
42e5c802 | 3269 | if (tx_seq == chan->expected_tx_seq) |
8f17154f | 3270 | goto expected; |
1c2acffb | 3271 | |
42e5c802 | 3272 | tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; |
9b53350d JPRV |
3273 | if (tx_seq_offset < 0) |
3274 | tx_seq_offset += 64; | |
3275 | ||
3276 | /* invalid tx_seq */ | |
3277 | if (tx_seq_offset >= pi->tx_win) { | |
e92c8e70 | 3278 | l2cap_send_disconn_req(pi->conn, chan, ECONNRESET); |
9b53350d JPRV |
3279 | goto drop; |
3280 | } | |
3281 | ||
525cd185 | 3282 | if (chan->conn_state == L2CAP_CONN_LOCAL_BUSY) |
1890d36b GP |
3283 | goto drop; |
3284 | ||
525cd185 | 3285 | if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { |
8f17154f | 3286 | struct srej_list *first; |
30afb5b2 | 3287 | |
39d5a3ee | 3288 | first = list_first_entry(&chan->srej_l, |
8f17154f GP |
3289 | struct srej_list, list); |
3290 | if (tx_seq == first->tx_seq) { | |
42e5c802 | 3291 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
525cd185 | 3292 | l2cap_check_srej_gap(chan, tx_seq); |
8f17154f GP |
3293 | |
3294 | list_del(&first->list); | |
3295 | kfree(first); | |
3296 | ||
39d5a3ee | 3297 | if (list_empty(&chan->srej_l)) { |
42e5c802 | 3298 | chan->buffer_seq = chan->buffer_seq_srej; |
525cd185 GP |
3299 | chan->conn_state &= ~L2CAP_CONN_SREJ_SENT; |
3300 | l2cap_send_ack(chan); | |
49208c9c | 3301 | BT_DBG("chan %p, Exit SREJ_SENT", chan); |
8f17154f GP |
3302 | } |
3303 | } else { | |
3304 | struct srej_list *l; | |
9b53350d JPRV |
3305 | |
3306 | /* duplicated tx_seq */ | |
42e5c802 | 3307 | if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0) |
9b53350d | 3308 | goto drop; |
8f17154f | 3309 | |
39d5a3ee | 3310 | list_for_each_entry(l, &chan->srej_l, list) { |
8f17154f | 3311 | if (l->tx_seq == tx_seq) { |
525cd185 | 3312 | l2cap_resend_srejframe(chan, tx_seq); |
8f17154f GP |
3313 | return 0; |
3314 | } | |
3315 | } | |
525cd185 | 3316 | l2cap_send_srejframe(chan, tx_seq); |
30afb5b2 GP |
3317 | } |
3318 | } else { | |
9b53350d | 3319 | expected_tx_seq_offset = |
42e5c802 | 3320 | (chan->expected_tx_seq - chan->buffer_seq) % 64; |
9b53350d JPRV |
3321 | if (expected_tx_seq_offset < 0) |
3322 | expected_tx_seq_offset += 64; | |
3323 | ||
3324 | /* duplicated tx_seq */ | |
3325 | if (tx_seq_offset < expected_tx_seq_offset) | |
3326 | goto drop; | |
3327 | ||
525cd185 | 3328 | chan->conn_state |= L2CAP_CONN_SREJ_SENT; |
1c2acffb | 3329 | |
49208c9c | 3330 | BT_DBG("chan %p, Enter SREJ", chan); |
0e98958d | 3331 | |
39d5a3ee | 3332 | INIT_LIST_HEAD(&chan->srej_l); |
42e5c802 | 3333 | chan->buffer_seq_srej = chan->buffer_seq; |
8f17154f | 3334 | |
f1c6775b GP |
3335 | __skb_queue_head_init(&chan->srej_q); |
3336 | __skb_queue_head_init(&chan->busy_q); | |
42e5c802 | 3337 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
8f17154f | 3338 | |
525cd185 | 3339 | chan->conn_state |= L2CAP_CONN_SEND_PBIT; |
ef54fd93 | 3340 | |
525cd185 | 3341 | l2cap_send_srejframe(chan, tx_seq); |
7fe9b298 | 3342 | |
e92c8e70 | 3343 | del_timer(&chan->ack_timer); |
1c2acffb | 3344 | } |
30afb5b2 GP |
3345 | return 0; |
3346 | ||
8f17154f | 3347 | expected: |
42e5c802 | 3348 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; |
8f17154f | 3349 | |
525cd185 | 3350 | if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { |
3b1a9f3f GP |
3351 | bt_cb(skb)->tx_seq = tx_seq; |
3352 | bt_cb(skb)->sar = sar; | |
f1c6775b | 3353 | __skb_queue_tail(&chan->srej_q, skb); |
8f17154f GP |
3354 | return 0; |
3355 | } | |
3356 | ||
525cd185 | 3357 | err = l2cap_push_rx_skb(chan, skb, rx_control); |
2ece3684 GP |
3358 | if (err < 0) |
3359 | return 0; | |
3360 | ||
4ec10d97 | 3361 | if (rx_control & L2CAP_CTRL_FINAL) { |
525cd185 GP |
3362 | if (chan->conn_state & L2CAP_CONN_REJ_ACT) |
3363 | chan->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be | 3364 | else |
525cd185 | 3365 | l2cap_retransmit_frames(chan); |
4ec10d97 GP |
3366 | } |
3367 | ||
c1b4f43b GP |
3368 | __mod_ack_timer(); |
3369 | ||
6a026610 GP |
3370 | chan->num_acked = (chan->num_acked + 1) % num_to_ack; |
3371 | if (chan->num_acked == num_to_ack - 1) | |
525cd185 | 3372 | l2cap_send_ack(chan); |
9e917af1 | 3373 | |
8f17154f | 3374 | return 0; |
9b53350d JPRV |
3375 | |
3376 | drop: | |
3377 | kfree_skb(skb); | |
3378 | return 0; | |
1c2acffb GP |
3379 | } |
3380 | ||
525cd185 | 3381 | static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u16 rx_control) |
1c2acffb | 3382 | { |
49208c9c | 3383 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, __get_reqseq(rx_control), |
0e98958d GP |
3384 | rx_control); |
3385 | ||
42e5c802 GP |
3386 | chan->expected_ack_seq = __get_reqseq(rx_control); |
3387 | l2cap_drop_acked_frames(chan); | |
1c2acffb | 3388 | |
e072745f | 3389 | if (rx_control & L2CAP_CTRL_POLL) { |
525cd185 GP |
3390 | chan->conn_state |= L2CAP_CONN_SEND_FBIT; |
3391 | if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { | |
3392 | if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && | |
6a026610 | 3393 | (chan->unacked_frames > 0)) |
05fbd89d GP |
3394 | __mod_retrans_timer(); |
3395 | ||
525cd185 GP |
3396 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3397 | l2cap_send_srejtail(chan); | |
05fbd89d | 3398 | } else { |
525cd185 | 3399 | l2cap_send_i_or_rr_or_rnr(chan); |
05fbd89d | 3400 | } |
1d8f5d16 | 3401 | |
e072745f | 3402 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
525cd185 | 3403 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
4ec10d97 | 3404 | |
525cd185 GP |
3405 | if (chan->conn_state & L2CAP_CONN_REJ_ACT) |
3406 | chan->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be | 3407 | else |
525cd185 | 3408 | l2cap_retransmit_frames(chan); |
2246b2f1 | 3409 | |
e072745f | 3410 | } else { |
525cd185 | 3411 | if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && |
6a026610 | 3412 | (chan->unacked_frames > 0)) |
e072745f | 3413 | __mod_retrans_timer(); |
1c2acffb | 3414 | |
525cd185 GP |
3415 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3416 | if (chan->conn_state & L2CAP_CONN_SREJ_SENT) | |
3417 | l2cap_send_ack(chan); | |
894718a6 | 3418 | else |
525cd185 | 3419 | l2cap_ertm_send(chan); |
e072745f GP |
3420 | } |
3421 | } | |
2246b2f1 | 3422 | |
525cd185 | 3423 | static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3424 | { |
e072745f | 3425 | u8 tx_seq = __get_reqseq(rx_control); |
30afb5b2 | 3426 | |
525cd185 | 3427 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3428 | |
525cd185 | 3429 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
e072745f | 3430 | |
42e5c802 GP |
3431 | chan->expected_ack_seq = tx_seq; |
3432 | l2cap_drop_acked_frames(chan); | |
e072745f GP |
3433 | |
3434 | if (rx_control & L2CAP_CTRL_FINAL) { | |
525cd185 GP |
3435 | if (chan->conn_state & L2CAP_CONN_REJ_ACT) |
3436 | chan->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be | 3437 | else |
525cd185 | 3438 | l2cap_retransmit_frames(chan); |
e072745f | 3439 | } else { |
525cd185 | 3440 | l2cap_retransmit_frames(chan); |
30afb5b2 | 3441 | |
525cd185 GP |
3442 | if (chan->conn_state & L2CAP_CONN_WAIT_F) |
3443 | chan->conn_state |= L2CAP_CONN_REJ_ACT; | |
e072745f GP |
3444 | } |
3445 | } | |
525cd185 | 3446 | static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3447 | { |
e072745f | 3448 | u8 tx_seq = __get_reqseq(rx_control); |
30afb5b2 | 3449 | |
525cd185 | 3450 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3451 | |
525cd185 | 3452 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
2246b2f1 | 3453 | |
e072745f | 3454 | if (rx_control & L2CAP_CTRL_POLL) { |
42e5c802 GP |
3455 | chan->expected_ack_seq = tx_seq; |
3456 | l2cap_drop_acked_frames(chan); | |
3cb123d1 | 3457 | |
525cd185 GP |
3458 | chan->conn_state |= L2CAP_CONN_SEND_FBIT; |
3459 | l2cap_retransmit_one_frame(chan, tx_seq); | |
dfc909be | 3460 | |
525cd185 | 3461 | l2cap_ertm_send(chan); |
dfc909be | 3462 | |
525cd185 | 3463 | if (chan->conn_state & L2CAP_CONN_WAIT_F) { |
6a026610 | 3464 | chan->srej_save_reqseq = tx_seq; |
525cd185 | 3465 | chan->conn_state |= L2CAP_CONN_SREJ_ACT; |
ef54fd93 | 3466 | } |
e072745f | 3467 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
525cd185 | 3468 | if ((chan->conn_state & L2CAP_CONN_SREJ_ACT) && |
6a026610 | 3469 | chan->srej_save_reqseq == tx_seq) |
525cd185 | 3470 | chan->conn_state &= ~L2CAP_CONN_SREJ_ACT; |
e072745f | 3471 | else |
525cd185 | 3472 | l2cap_retransmit_one_frame(chan, tx_seq); |
e072745f | 3473 | } else { |
525cd185 GP |
3474 | l2cap_retransmit_one_frame(chan, tx_seq); |
3475 | if (chan->conn_state & L2CAP_CONN_WAIT_F) { | |
6a026610 | 3476 | chan->srej_save_reqseq = tx_seq; |
525cd185 | 3477 | chan->conn_state |= L2CAP_CONN_SREJ_ACT; |
ef54fd93 | 3478 | } |
e072745f GP |
3479 | } |
3480 | } | |
3481 | ||
525cd185 | 3482 | static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3483 | { |
e072745f GP |
3484 | u8 tx_seq = __get_reqseq(rx_control); |
3485 | ||
525cd185 | 3486 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3487 | |
525cd185 | 3488 | chan->conn_state |= L2CAP_CONN_REMOTE_BUSY; |
42e5c802 GP |
3489 | chan->expected_ack_seq = tx_seq; |
3490 | l2cap_drop_acked_frames(chan); | |
e072745f | 3491 | |
3cb123d1 | 3492 | if (rx_control & L2CAP_CTRL_POLL) |
525cd185 | 3493 | chan->conn_state |= L2CAP_CONN_SEND_FBIT; |
3cb123d1 | 3494 | |
525cd185 | 3495 | if (!(chan->conn_state & L2CAP_CONN_SREJ_SENT)) { |
e92c8e70 | 3496 | del_timer(&chan->retrans_timer); |
a2e12a2a | 3497 | if (rx_control & L2CAP_CTRL_POLL) |
525cd185 | 3498 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL); |
99b0d4b7 | 3499 | return; |
e072745f | 3500 | } |
99b0d4b7 GP |
3501 | |
3502 | if (rx_control & L2CAP_CTRL_POLL) | |
525cd185 | 3503 | l2cap_send_srejtail(chan); |
99b0d4b7 | 3504 | else |
525cd185 | 3505 | l2cap_send_sframe(chan, L2CAP_SUPER_RCV_READY); |
e072745f GP |
3506 | } |
3507 | ||
525cd185 | 3508 | static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) |
e072745f | 3509 | { |
525cd185 | 3510 | BT_DBG("chan %p rx_control 0x%4.4x len %d", chan, rx_control, skb->len); |
e072745f | 3511 | |
9b16dc65 | 3512 | if (L2CAP_CTRL_FINAL & rx_control && |
525cd185 | 3513 | chan->conn_state & L2CAP_CONN_WAIT_F) { |
e92c8e70 | 3514 | del_timer(&chan->monitor_timer); |
6a026610 | 3515 | if (chan->unacked_frames > 0) |
e072745f | 3516 | __mod_retrans_timer(); |
525cd185 | 3517 | chan->conn_state &= ~L2CAP_CONN_WAIT_F; |
e072745f GP |
3518 | } |
3519 | ||
3520 | switch (rx_control & L2CAP_CTRL_SUPERVISE) { | |
3521 | case L2CAP_SUPER_RCV_READY: | |
525cd185 | 3522 | l2cap_data_channel_rrframe(chan, rx_control); |
8f17154f GP |
3523 | break; |
3524 | ||
e072745f | 3525 | case L2CAP_SUPER_REJECT: |
525cd185 | 3526 | l2cap_data_channel_rejframe(chan, rx_control); |
e072745f | 3527 | break; |
2246b2f1 | 3528 | |
e072745f | 3529 | case L2CAP_SUPER_SELECT_REJECT: |
525cd185 | 3530 | l2cap_data_channel_srejframe(chan, rx_control); |
e072745f GP |
3531 | break; |
3532 | ||
3533 | case L2CAP_SUPER_RCV_NOT_READY: | |
525cd185 | 3534 | l2cap_data_channel_rnrframe(chan, rx_control); |
1c2acffb GP |
3535 | break; |
3536 | } | |
3537 | ||
faaebd19 | 3538 | kfree_skb(skb); |
1c2acffb GP |
3539 | return 0; |
3540 | } | |
3541 | ||
218bb9df GP |
3542 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) |
3543 | { | |
525cd185 | 3544 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
218bb9df GP |
3545 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
3546 | u16 control; | |
3547 | u8 req_seq; | |
3548 | int len, next_tx_seq_offset, req_seq_offset; | |
3549 | ||
3550 | control = get_unaligned_le16(skb->data); | |
3551 | skb_pull(skb, 2); | |
3552 | len = skb->len; | |
3553 | ||
3554 | /* | |
3555 | * We can just drop the corrupted I-frame here. | |
3556 | * Receiver will miss it and start proper recovery | |
3557 | * procedures and ask retransmission. | |
3558 | */ | |
3559 | if (l2cap_check_fcs(pi, skb)) | |
3560 | goto drop; | |
3561 | ||
3562 | if (__is_sar_start(control) && __is_iframe(control)) | |
3563 | len -= 2; | |
3564 | ||
3565 | if (pi->fcs == L2CAP_FCS_CRC16) | |
3566 | len -= 2; | |
3567 | ||
3568 | if (len > pi->mps) { | |
e92c8e70 | 3569 | l2cap_send_disconn_req(pi->conn, chan, ECONNRESET); |
218bb9df GP |
3570 | goto drop; |
3571 | } | |
3572 | ||
3573 | req_seq = __get_reqseq(control); | |
42e5c802 | 3574 | req_seq_offset = (req_seq - chan->expected_ack_seq) % 64; |
218bb9df GP |
3575 | if (req_seq_offset < 0) |
3576 | req_seq_offset += 64; | |
3577 | ||
3578 | next_tx_seq_offset = | |
42e5c802 | 3579 | (chan->next_tx_seq - chan->expected_ack_seq) % 64; |
218bb9df GP |
3580 | if (next_tx_seq_offset < 0) |
3581 | next_tx_seq_offset += 64; | |
3582 | ||
3583 | /* check for invalid req-seq */ | |
3584 | if (req_seq_offset > next_tx_seq_offset) { | |
e92c8e70 | 3585 | l2cap_send_disconn_req(pi->conn, chan, ECONNRESET); |
218bb9df GP |
3586 | goto drop; |
3587 | } | |
3588 | ||
3589 | if (__is_iframe(control)) { | |
3590 | if (len < 0) { | |
e92c8e70 | 3591 | l2cap_send_disconn_req(pi->conn, chan, ECONNRESET); |
218bb9df GP |
3592 | goto drop; |
3593 | } | |
3594 | ||
525cd185 | 3595 | l2cap_data_channel_iframe(chan, control, skb); |
218bb9df GP |
3596 | } else { |
3597 | if (len != 0) { | |
3598 | BT_ERR("%d", len); | |
e92c8e70 | 3599 | l2cap_send_disconn_req(pi->conn, chan, ECONNRESET); |
218bb9df GP |
3600 | goto drop; |
3601 | } | |
3602 | ||
525cd185 | 3603 | l2cap_data_channel_sframe(chan, control, skb); |
218bb9df GP |
3604 | } |
3605 | ||
3606 | return 0; | |
3607 | ||
3608 | drop: | |
3609 | kfree_skb(skb); | |
3610 | return 0; | |
3611 | } | |
3612 | ||
1da177e4 LT |
3613 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
3614 | { | |
48454079 | 3615 | struct l2cap_chan *chan; |
1da177e4 | 3616 | struct sock *sk; |
6840ed07 | 3617 | struct l2cap_pinfo *pi; |
51893f88 | 3618 | u16 control; |
218bb9df GP |
3619 | u8 tx_seq; |
3620 | int len; | |
1da177e4 | 3621 | |
baa7e1fa | 3622 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 3623 | if (!chan) { |
1da177e4 LT |
3624 | BT_DBG("unknown cid 0x%4.4x", cid); |
3625 | goto drop; | |
3626 | } | |
3627 | ||
48454079 | 3628 | sk = chan->sk; |
6840ed07 GP |
3629 | pi = l2cap_pi(sk); |
3630 | ||
49208c9c | 3631 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 LT |
3632 | |
3633 | if (sk->sk_state != BT_CONNECTED) | |
3634 | goto drop; | |
3635 | ||
6840ed07 | 3636 | switch (pi->mode) { |
1c2acffb GP |
3637 | case L2CAP_MODE_BASIC: |
3638 | /* If socket recv buffers overflows we drop data here | |
3639 | * which is *bad* because L2CAP has to be reliable. | |
3640 | * But we don't have any other choice. L2CAP doesn't | |
3641 | * provide flow control mechanism. */ | |
1da177e4 | 3642 | |
6840ed07 | 3643 | if (pi->imtu < skb->len) |
1c2acffb | 3644 | goto drop; |
1da177e4 | 3645 | |
1c2acffb GP |
3646 | if (!sock_queue_rcv_skb(sk, skb)) |
3647 | goto done; | |
3648 | break; | |
3649 | ||
3650 | case L2CAP_MODE_ERTM: | |
218bb9df GP |
3651 | if (!sock_owned_by_user(sk)) { |
3652 | l2cap_ertm_data_rcv(sk, skb); | |
277ffbe3 | 3653 | } else { |
218bb9df | 3654 | if (sk_add_backlog(sk, skb)) |
277ffbe3 | 3655 | goto drop; |
277ffbe3 | 3656 | } |
1c2acffb | 3657 | |
fcafde2e | 3658 | goto done; |
1c2acffb | 3659 | |
6840ed07 GP |
3660 | case L2CAP_MODE_STREAMING: |
3661 | control = get_unaligned_le16(skb->data); | |
3662 | skb_pull(skb, 2); | |
3663 | len = skb->len; | |
3664 | ||
26000089 GP |
3665 | if (l2cap_check_fcs(pi, skb)) |
3666 | goto drop; | |
3667 | ||
6840ed07 GP |
3668 | if (__is_sar_start(control)) |
3669 | len -= 2; | |
3670 | ||
fcc203c3 GP |
3671 | if (pi->fcs == L2CAP_FCS_CRC16) |
3672 | len -= 2; | |
3673 | ||
51893f88 | 3674 | if (len > pi->mps || len < 0 || __is_sframe(control)) |
6840ed07 GP |
3675 | goto drop; |
3676 | ||
3677 | tx_seq = __get_txseq(control); | |
3678 | ||
42e5c802 GP |
3679 | if (chan->expected_tx_seq == tx_seq) |
3680 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; | |
6840ed07 | 3681 | else |
42e5c802 | 3682 | chan->expected_tx_seq = (tx_seq + 1) % 64; |
6840ed07 | 3683 | |
525cd185 | 3684 | l2cap_streaming_reassembly_sdu(chan, skb, control); |
6840ed07 GP |
3685 | |
3686 | goto done; | |
3687 | ||
1c2acffb | 3688 | default: |
49208c9c | 3689 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, pi->mode); |
1c2acffb GP |
3690 | break; |
3691 | } | |
1da177e4 LT |
3692 | |
3693 | drop: | |
3694 | kfree_skb(skb); | |
3695 | ||
3696 | done: | |
0139418c MH |
3697 | if (sk) |
3698 | bh_unlock_sock(sk); | |
3699 | ||
1da177e4 LT |
3700 | return 0; |
3701 | } | |
3702 | ||
8e036fc3 | 3703 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 LT |
3704 | { |
3705 | struct sock *sk; | |
3706 | ||
3707 | sk = l2cap_get_sock_by_psm(0, psm, conn->src); | |
3708 | if (!sk) | |
3709 | goto drop; | |
3710 | ||
e0f0cb56 GP |
3711 | bh_lock_sock(sk); |
3712 | ||
1da177e4 LT |
3713 | BT_DBG("sk %p, len %d", sk, skb->len); |
3714 | ||
3715 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) | |
3716 | goto drop; | |
3717 | ||
3718 | if (l2cap_pi(sk)->imtu < skb->len) | |
3719 | goto drop; | |
3720 | ||
3721 | if (!sock_queue_rcv_skb(sk, skb)) | |
3722 | goto done; | |
3723 | ||
3724 | drop: | |
3725 | kfree_skb(skb); | |
3726 | ||
3727 | done: | |
af05b30b GP |
3728 | if (sk) |
3729 | bh_unlock_sock(sk); | |
1da177e4 LT |
3730 | return 0; |
3731 | } | |
3732 | ||
3733 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) | |
3734 | { | |
3735 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
3736 | u16 cid, len; |
3737 | __le16 psm; | |
1da177e4 LT |
3738 | |
3739 | skb_pull(skb, L2CAP_HDR_SIZE); | |
3740 | cid = __le16_to_cpu(lh->cid); | |
3741 | len = __le16_to_cpu(lh->len); | |
3742 | ||
1c2acffb GP |
3743 | if (len != skb->len) { |
3744 | kfree_skb(skb); | |
3745 | return; | |
3746 | } | |
3747 | ||
1da177e4 LT |
3748 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
3749 | ||
3750 | switch (cid) { | |
3300d9a9 | 3751 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 3752 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
3753 | l2cap_sig_channel(conn, skb); |
3754 | break; | |
3755 | ||
8db4dc46 | 3756 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 3757 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
3758 | skb_pull(skb, 2); |
3759 | l2cap_conless_channel(conn, psm, skb); | |
3760 | break; | |
3761 | ||
3762 | default: | |
3763 | l2cap_data_channel(conn, cid, skb); | |
3764 | break; | |
3765 | } | |
3766 | } | |
3767 | ||
3768 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
3769 | ||
3770 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
3771 | { | |
3772 | int exact = 0, lm1 = 0, lm2 = 0; | |
3773 | register struct sock *sk; | |
3774 | struct hlist_node *node; | |
3775 | ||
3776 | if (type != ACL_LINK) | |
963cf687 | 3777 | return -EINVAL; |
1da177e4 LT |
3778 | |
3779 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
3780 | ||
3781 | /* Find listening sockets and check their link_mode */ | |
3782 | read_lock(&l2cap_sk_list.lock); | |
3783 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
3784 | if (sk->sk_state != BT_LISTEN) | |
3785 | continue; | |
3786 | ||
3787 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 MH |
3788 | lm1 |= HCI_LM_ACCEPT; |
3789 | if (l2cap_pi(sk)->role_switch) | |
3790 | lm1 |= HCI_LM_MASTER; | |
1da177e4 | 3791 | exact++; |
2af6b9d5 MH |
3792 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
3793 | lm2 |= HCI_LM_ACCEPT; | |
3794 | if (l2cap_pi(sk)->role_switch) | |
3795 | lm2 |= HCI_LM_MASTER; | |
3796 | } | |
1da177e4 LT |
3797 | } |
3798 | read_unlock(&l2cap_sk_list.lock); | |
3799 | ||
3800 | return exact ? lm1 : lm2; | |
3801 | } | |
3802 | ||
3803 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
3804 | { | |
0139418c MH |
3805 | struct l2cap_conn *conn; |
3806 | ||
1da177e4 LT |
3807 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
3808 | ||
acd7d370 | 3809 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 3810 | return -EINVAL; |
1da177e4 LT |
3811 | |
3812 | if (!status) { | |
1da177e4 LT |
3813 | conn = l2cap_conn_add(hcon, status); |
3814 | if (conn) | |
3815 | l2cap_conn_ready(conn); | |
0139418c | 3816 | } else |
1da177e4 LT |
3817 | l2cap_conn_del(hcon, bt_err(status)); |
3818 | ||
3819 | return 0; | |
3820 | } | |
3821 | ||
2950f21a MH |
3822 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
3823 | { | |
3824 | struct l2cap_conn *conn = hcon->l2cap_data; | |
3825 | ||
3826 | BT_DBG("hcon %p", hcon); | |
3827 | ||
3828 | if (hcon->type != ACL_LINK || !conn) | |
3829 | return 0x13; | |
3830 | ||
3831 | return conn->disc_reason; | |
3832 | } | |
3833 | ||
3834 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
3835 | { |
3836 | BT_DBG("hcon %p reason %d", hcon, reason); | |
3837 | ||
acd7d370 | 3838 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 3839 | return -EINVAL; |
1da177e4 LT |
3840 | |
3841 | l2cap_conn_del(hcon, bt_err(reason)); | |
0139418c | 3842 | |
1da177e4 LT |
3843 | return 0; |
3844 | } | |
3845 | ||
f62e4323 MH |
3846 | static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) |
3847 | { | |
bd3c9e25 | 3848 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) |
255c7601 MH |
3849 | return; |
3850 | ||
f62e4323 MH |
3851 | if (encrypt == 0x00) { |
3852 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { | |
3853 | l2cap_sock_clear_timer(sk); | |
3854 | l2cap_sock_set_timer(sk, HZ * 5); | |
3855 | } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) | |
3856 | __l2cap_sock_close(sk, ECONNREFUSED); | |
3857 | } else { | |
3858 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) | |
3859 | l2cap_sock_clear_timer(sk); | |
3860 | } | |
3861 | } | |
3862 | ||
8c1b2355 | 3863 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 3864 | { |
0139418c | 3865 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 3866 | struct l2cap_chan *chan; |
1da177e4 | 3867 | |
0139418c | 3868 | if (!conn) |
1da177e4 | 3869 | return 0; |
0139418c | 3870 | |
1da177e4 LT |
3871 | BT_DBG("conn %p", conn); |
3872 | ||
baa7e1fa | 3873 | read_lock(&conn->chan_lock); |
1da177e4 | 3874 | |
baa7e1fa | 3875 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 3876 | struct sock *sk = chan->sk; |
baa7e1fa | 3877 | |
1da177e4 LT |
3878 | bh_lock_sock(sk); |
3879 | ||
6a8d3010 MH |
3880 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) { |
3881 | bh_unlock_sock(sk); | |
3882 | continue; | |
3883 | } | |
3884 | ||
f62e4323 | 3885 | if (!status && (sk->sk_state == BT_CONNECTED || |
8c1b2355 | 3886 | sk->sk_state == BT_CONFIG)) { |
f62e4323 | 3887 | l2cap_check_encryption(sk, encrypt); |
9719f8af MH |
3888 | bh_unlock_sock(sk); |
3889 | continue; | |
3890 | } | |
3891 | ||
b1235d79 MH |
3892 | if (sk->sk_state == BT_CONNECT) { |
3893 | if (!status) { | |
3894 | struct l2cap_conn_req req; | |
3895 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
3896 | req.psm = l2cap_pi(sk)->psm; | |
1da177e4 | 3897 | |
fc7f8a7e | 3898 | chan->ident = l2cap_get_ident(conn); |
e501d055 | 3899 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 | 3900 | |
fc7f8a7e | 3901 | l2cap_send_cmd(conn, chan->ident, |
b1235d79 MH |
3902 | L2CAP_CONN_REQ, sizeof(req), &req); |
3903 | } else { | |
3904 | l2cap_sock_clear_timer(sk); | |
3905 | l2cap_sock_set_timer(sk, HZ / 10); | |
3906 | } | |
3907 | } else if (sk->sk_state == BT_CONNECT2) { | |
3908 | struct l2cap_conn_rsp rsp; | |
3909 | __u16 result; | |
1da177e4 | 3910 | |
b1235d79 MH |
3911 | if (!status) { |
3912 | sk->sk_state = BT_CONFIG; | |
3913 | result = L2CAP_CR_SUCCESS; | |
3914 | } else { | |
3915 | sk->sk_state = BT_DISCONN; | |
3916 | l2cap_sock_set_timer(sk, HZ / 10); | |
3917 | result = L2CAP_CR_SEC_BLOCK; | |
3918 | } | |
3919 | ||
3920 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
3921 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
3922 | rsp.result = cpu_to_le16(result); | |
e7c29cb1 | 3923 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
fc7f8a7e GP |
3924 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
3925 | sizeof(rsp), &rsp); | |
b1235d79 | 3926 | } |
1da177e4 LT |
3927 | |
3928 | bh_unlock_sock(sk); | |
3929 | } | |
3930 | ||
baa7e1fa | 3931 | read_unlock(&conn->chan_lock); |
b1235d79 | 3932 | |
1da177e4 LT |
3933 | return 0; |
3934 | } | |
3935 | ||
3936 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
3937 | { | |
3938 | struct l2cap_conn *conn = hcon->l2cap_data; | |
3939 | ||
5a08ecce AE |
3940 | if (!conn) |
3941 | conn = l2cap_conn_add(hcon, 0); | |
3942 | ||
3943 | if (!conn) | |
1da177e4 LT |
3944 | goto drop; |
3945 | ||
3946 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
3947 | ||
e702112f | 3948 | if (!(flags & ACL_CONT)) { |
1da177e4 | 3949 | struct l2cap_hdr *hdr; |
48454079 | 3950 | struct l2cap_chan *chan; |
89794813 | 3951 | u16 cid; |
1da177e4 LT |
3952 | int len; |
3953 | ||
3954 | if (conn->rx_len) { | |
3955 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
3956 | kfree_skb(conn->rx_skb); | |
3957 | conn->rx_skb = NULL; | |
3958 | conn->rx_len = 0; | |
3959 | l2cap_conn_unreliable(conn, ECOMM); | |
3960 | } | |
3961 | ||
aae7fe22 AE |
3962 | /* Start fragment always begin with Basic L2CAP header */ |
3963 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
3964 | BT_ERR("Frame is too short (len %d)", skb->len); |
3965 | l2cap_conn_unreliable(conn, ECOMM); | |
3966 | goto drop; | |
3967 | } | |
3968 | ||
3969 | hdr = (struct l2cap_hdr *) skb->data; | |
3970 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
89794813 | 3971 | cid = __le16_to_cpu(hdr->cid); |
1da177e4 LT |
3972 | |
3973 | if (len == skb->len) { | |
3974 | /* Complete frame received */ | |
3975 | l2cap_recv_frame(conn, skb); | |
3976 | return 0; | |
3977 | } | |
3978 | ||
3979 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
3980 | ||
3981 | if (skb->len > len) { | |
3982 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
3983 | skb->len, len); | |
3984 | l2cap_conn_unreliable(conn, ECOMM); | |
3985 | goto drop; | |
3986 | } | |
3987 | ||
baa7e1fa | 3988 | chan = l2cap_get_chan_by_scid(conn, cid); |
89794813 | 3989 | |
48454079 GP |
3990 | if (chan && chan->sk) { |
3991 | struct sock *sk = chan->sk; | |
89794813 | 3992 | |
48454079 GP |
3993 | if (l2cap_pi(sk)->imtu < len - L2CAP_HDR_SIZE) { |
3994 | BT_ERR("Frame exceeding recv MTU (len %d, " | |
3995 | "MTU %d)", len, | |
3996 | l2cap_pi(sk)->imtu); | |
3997 | bh_unlock_sock(sk); | |
3998 | l2cap_conn_unreliable(conn, ECOMM); | |
3999 | goto drop; | |
4000 | } | |
89794813 | 4001 | bh_unlock_sock(sk); |
48454079 | 4002 | } |
89794813 | 4003 | |
1da177e4 | 4004 | /* Allocate skb for the complete frame (with header) */ |
af05b30b GP |
4005 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
4006 | if (!conn->rx_skb) | |
1da177e4 LT |
4007 | goto drop; |
4008 | ||
d626f62b | 4009 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4010 | skb->len); |
1da177e4 LT |
4011 | conn->rx_len = len - skb->len; |
4012 | } else { | |
4013 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
4014 | ||
4015 | if (!conn->rx_len) { | |
4016 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
4017 | l2cap_conn_unreliable(conn, ECOMM); | |
4018 | goto drop; | |
4019 | } | |
4020 | ||
4021 | if (skb->len > conn->rx_len) { | |
4022 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
4023 | skb->len, conn->rx_len); | |
4024 | kfree_skb(conn->rx_skb); | |
4025 | conn->rx_skb = NULL; | |
4026 | conn->rx_len = 0; | |
4027 | l2cap_conn_unreliable(conn, ECOMM); | |
4028 | goto drop; | |
4029 | } | |
4030 | ||
d626f62b | 4031 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4032 | skb->len); |
1da177e4 LT |
4033 | conn->rx_len -= skb->len; |
4034 | ||
4035 | if (!conn->rx_len) { | |
4036 | /* Complete frame received */ | |
4037 | l2cap_recv_frame(conn, conn->rx_skb); | |
4038 | conn->rx_skb = NULL; | |
4039 | } | |
4040 | } | |
4041 | ||
4042 | drop: | |
4043 | kfree_skb(skb); | |
4044 | return 0; | |
4045 | } | |
4046 | ||
aef7d97c | 4047 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 LT |
4048 | { |
4049 | struct sock *sk; | |
4050 | struct hlist_node *node; | |
1da177e4 LT |
4051 | |
4052 | read_lock_bh(&l2cap_sk_list.lock); | |
4053 | ||
be9d1227 MH |
4054 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
4055 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
101545f6 | 4056 | |
903d343e | 4057 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
4058 | batostr(&bt_sk(sk)->src), |
4059 | batostr(&bt_sk(sk)->dst), | |
4060 | sk->sk_state, __le16_to_cpu(pi->psm), | |
4061 | pi->scid, pi->dcid, | |
903d343e GP |
4062 | pi->imtu, pi->omtu, pi->sec_level, |
4063 | pi->mode); | |
be9d1227 | 4064 | } |
1da177e4 | 4065 | |
1da177e4 | 4066 | read_unlock_bh(&l2cap_sk_list.lock); |
1da177e4 | 4067 | |
aef7d97c | 4068 | return 0; |
1da177e4 LT |
4069 | } |
4070 | ||
aef7d97c MH |
4071 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
4072 | { | |
4073 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
4074 | } | |
4075 | ||
4076 | static const struct file_operations l2cap_debugfs_fops = { | |
4077 | .open = l2cap_debugfs_open, | |
4078 | .read = seq_read, | |
4079 | .llseek = seq_lseek, | |
4080 | .release = single_release, | |
4081 | }; | |
4082 | ||
4083 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 4084 | |
1da177e4 LT |
4085 | static struct hci_proto l2cap_hci_proto = { |
4086 | .name = "L2CAP", | |
4087 | .id = HCI_PROTO_L2CAP, | |
4088 | .connect_ind = l2cap_connect_ind, | |
4089 | .connect_cfm = l2cap_connect_cfm, | |
4090 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4091 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4092 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4093 | .recv_acldata = l2cap_recv_acldata |
4094 | }; | |
4095 | ||
64274518 | 4096 | int __init l2cap_init(void) |
1da177e4 LT |
4097 | { |
4098 | int err; | |
be9d1227 | 4099 | |
bb58f747 | 4100 | err = l2cap_init_sockets(); |
1da177e4 LT |
4101 | if (err < 0) |
4102 | return err; | |
4103 | ||
1890d36b | 4104 | _busy_wq = create_singlethread_workqueue("l2cap"); |
b78d7b4f | 4105 | if (!_busy_wq) { |
bb58f747 | 4106 | err = -ENOMEM; |
1da177e4 LT |
4107 | goto error; |
4108 | } | |
4109 | ||
4110 | err = hci_register_proto(&l2cap_hci_proto); | |
4111 | if (err < 0) { | |
4112 | BT_ERR("L2CAP protocol registration failed"); | |
4113 | bt_sock_unregister(BTPROTO_L2CAP); | |
4114 | goto error; | |
4115 | } | |
4116 | ||
aef7d97c MH |
4117 | if (bt_debugfs) { |
4118 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4119 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4120 | if (!l2cap_debugfs) | |
4121 | BT_ERR("Failed to create L2CAP debug file"); | |
4122 | } | |
1da177e4 | 4123 | |
1da177e4 LT |
4124 | return 0; |
4125 | ||
4126 | error: | |
b78d7b4f | 4127 | destroy_workqueue(_busy_wq); |
bb58f747 | 4128 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4129 | return err; |
4130 | } | |
4131 | ||
64274518 | 4132 | void l2cap_exit(void) |
1da177e4 | 4133 | { |
aef7d97c | 4134 | debugfs_remove(l2cap_debugfs); |
1da177e4 | 4135 | |
1890d36b GP |
4136 | flush_workqueue(_busy_wq); |
4137 | destroy_workqueue(_busy_wq); | |
4138 | ||
1da177e4 LT |
4139 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) |
4140 | BT_ERR("L2CAP protocol unregistration failed"); | |
4141 | ||
bb58f747 | 4142 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4143 | } |
4144 | ||
d1c4a17d GP |
4145 | module_param(disable_ertm, bool, 0644); |
4146 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |