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 | ||
58d35f87 | 243 | skb_queue_purge(&chan->tx_q); |
c13ffa62 GP |
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 | 480 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { |
e92c8e70 GP |
481 | del_timer(&chan->retrans_timer); |
482 | del_timer(&chan->monitor_timer); | |
483 | del_timer(&chan->ack_timer); | |
c13ffa62 GP |
484 | } |
485 | ||
22121fc9 GP |
486 | req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); |
487 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
488 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
489 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 GP |
490 | |
491 | sk->sk_state = BT_DISCONN; | |
9b108fc0 | 492 | sk->sk_err = err; |
22121fc9 GP |
493 | } |
494 | ||
1da177e4 | 495 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
496 | static void l2cap_conn_start(struct l2cap_conn *conn) |
497 | { | |
820ffdb3 | 498 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
499 | |
500 | BT_DBG("conn %p", conn); | |
501 | ||
baa7e1fa | 502 | read_lock(&conn->chan_lock); |
4e8402a3 | 503 | |
820ffdb3 | 504 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 505 | struct sock *sk = chan->sk; |
baa7e1fa | 506 | |
4e8402a3 MH |
507 | bh_lock_sock(sk); |
508 | ||
bd3c9e25 GP |
509 | if (sk->sk_type != SOCK_SEQPACKET && |
510 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
511 | bh_unlock_sock(sk); |
512 | continue; | |
513 | } | |
514 | ||
515 | if (sk->sk_state == BT_CONNECT) { | |
47731de7 | 516 | struct l2cap_conn_req req; |
79d554a6 | 517 | |
47731de7 GP |
518 | if (!l2cap_check_security(sk) || |
519 | !__l2cap_no_conn_pending(sk)) { | |
520 | bh_unlock_sock(sk); | |
521 | continue; | |
522 | } | |
79d554a6 | 523 | |
47731de7 GP |
524 | if (!l2cap_mode_supported(l2cap_pi(sk)->mode, |
525 | conn->feat_mask) | |
526 | && l2cap_pi(sk)->conf_state & | |
527 | L2CAP_CONF_STATE2_DEVICE) { | |
820ffdb3 GP |
528 | /* __l2cap_sock_close() calls list_del(chan) |
529 | * so release the lock */ | |
530 | read_unlock_bh(&conn->chan_lock); | |
531 | __l2cap_sock_close(sk, ECONNRESET); | |
532 | read_lock_bh(&conn->chan_lock); | |
47731de7 GP |
533 | bh_unlock_sock(sk); |
534 | continue; | |
b1235d79 | 535 | } |
47731de7 GP |
536 | |
537 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
538 | req.psm = l2cap_pi(sk)->psm; | |
539 | ||
fc7f8a7e | 540 | chan->ident = l2cap_get_ident(conn); |
47731de7 GP |
541 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
542 | ||
fc7f8a7e GP |
543 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, |
544 | sizeof(req), &req); | |
47731de7 | 545 | |
79d554a6 MH |
546 | } else if (sk->sk_state == BT_CONNECT2) { |
547 | struct l2cap_conn_rsp rsp; | |
e9aeb2dd | 548 | char buf[128]; |
79d554a6 MH |
549 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
550 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
551 | ||
2af6b9d5 | 552 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
553 | if (bt_sk(sk)->defer_setup) { |
554 | struct sock *parent = bt_sk(sk)->parent; | |
555 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
556 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
557 | parent->sk_data_ready(parent, 0); | |
558 | ||
559 | } else { | |
560 | sk->sk_state = BT_CONFIG; | |
561 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
562 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
563 | } | |
79d554a6 MH |
564 | } else { |
565 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
566 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
567 | } | |
568 | ||
fc7f8a7e GP |
569 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
570 | sizeof(rsp), &rsp); | |
e9aeb2dd GP |
571 | |
572 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT || | |
573 | rsp.result != L2CAP_CR_SUCCESS) { | |
574 | bh_unlock_sock(sk); | |
575 | continue; | |
576 | } | |
577 | ||
578 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
579 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
73ffa904 GP |
580 | l2cap_build_conf_req(chan, buf), buf); |
581 | chan->num_conf_req++; | |
4e8402a3 MH |
582 | } |
583 | ||
584 | bh_unlock_sock(sk); | |
585 | } | |
586 | ||
baa7e1fa | 587 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
588 | } |
589 | ||
b62f328b VT |
590 | /* Find socket with cid and source bdaddr. |
591 | * Returns closest match, locked. | |
592 | */ | |
593 | static struct sock *l2cap_get_sock_by_scid(int state, __le16 cid, bdaddr_t *src) | |
594 | { | |
280f294f | 595 | struct sock *sk = NULL, *sk1 = NULL; |
b62f328b VT |
596 | struct hlist_node *node; |
597 | ||
598 | read_lock(&l2cap_sk_list.lock); | |
599 | ||
600 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
601 | if (state && sk->sk_state != state) | |
602 | continue; | |
603 | ||
604 | if (l2cap_pi(sk)->scid == cid) { | |
605 | /* Exact match. */ | |
606 | if (!bacmp(&bt_sk(sk)->src, src)) | |
607 | break; | |
608 | ||
609 | /* Closest match */ | |
610 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
611 | sk1 = sk; | |
612 | } | |
613 | } | |
280f294f | 614 | |
b62f328b VT |
615 | read_unlock(&l2cap_sk_list.lock); |
616 | ||
280f294f | 617 | return node ? sk : sk1; |
b62f328b VT |
618 | } |
619 | ||
620 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
621 | { | |
c916fbe4 | 622 | struct sock *parent, *sk; |
48454079 | 623 | struct l2cap_chan *chan; |
b62f328b VT |
624 | |
625 | BT_DBG(""); | |
626 | ||
627 | /* Check if we have socket listening on cid */ | |
628 | parent = l2cap_get_sock_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, | |
629 | conn->src); | |
630 | if (!parent) | |
631 | return; | |
632 | ||
62f3a2cf GP |
633 | bh_lock_sock(parent); |
634 | ||
b62f328b VT |
635 | /* Check for backlog size */ |
636 | if (sk_acceptq_is_full(parent)) { | |
637 | BT_DBG("backlog full %d", parent->sk_ack_backlog); | |
638 | goto clean; | |
639 | } | |
640 | ||
641 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); | |
642 | if (!sk) | |
643 | goto clean; | |
644 | ||
48454079 GP |
645 | chan = l2cap_chan_alloc(sk); |
646 | if (!chan) { | |
647 | l2cap_sock_kill(sk); | |
648 | goto clean; | |
649 | } | |
650 | ||
baa7e1fa | 651 | write_lock_bh(&conn->chan_lock); |
b62f328b VT |
652 | |
653 | hci_conn_hold(conn->hcon); | |
654 | ||
655 | l2cap_sock_init(sk, parent); | |
baa7e1fa | 656 | |
b62f328b VT |
657 | bacpy(&bt_sk(sk)->src, conn->src); |
658 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
659 | ||
d1010240 GP |
660 | bt_accept_enqueue(parent, sk); |
661 | ||
48454079 GP |
662 | __l2cap_chan_add(conn, chan); |
663 | ||
664 | l2cap_pi(sk)->chan = chan; | |
b62f328b VT |
665 | |
666 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
667 | ||
668 | sk->sk_state = BT_CONNECTED; | |
669 | parent->sk_data_ready(parent, 0); | |
670 | ||
baa7e1fa | 671 | write_unlock_bh(&conn->chan_lock); |
b62f328b VT |
672 | |
673 | clean: | |
674 | bh_unlock_sock(parent); | |
675 | } | |
676 | ||
4e8402a3 MH |
677 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
678 | { | |
48454079 | 679 | struct l2cap_chan *chan; |
4e8402a3 | 680 | |
79d554a6 | 681 | BT_DBG("conn %p", conn); |
4e8402a3 | 682 | |
b62f328b VT |
683 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
684 | l2cap_le_conn_ready(conn); | |
685 | ||
baa7e1fa | 686 | read_lock(&conn->chan_lock); |
4e8402a3 | 687 | |
baa7e1fa | 688 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 689 | struct sock *sk = chan->sk; |
baa7e1fa | 690 | |
79d554a6 | 691 | bh_lock_sock(sk); |
4e8402a3 | 692 | |
acd7d370 VT |
693 | if (conn->hcon->type == LE_LINK) { |
694 | l2cap_sock_clear_timer(sk); | |
695 | sk->sk_state = BT_CONNECTED; | |
696 | sk->sk_state_change(sk); | |
697 | } | |
698 | ||
bd3c9e25 GP |
699 | if (sk->sk_type != SOCK_SEQPACKET && |
700 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
701 | l2cap_sock_clear_timer(sk); |
702 | sk->sk_state = BT_CONNECTED; | |
703 | sk->sk_state_change(sk); | |
704 | } else if (sk->sk_state == BT_CONNECT) | |
fc7f8a7e | 705 | l2cap_do_start(chan); |
4e8402a3 | 706 | |
79d554a6 | 707 | bh_unlock_sock(sk); |
4e8402a3 | 708 | } |
79d554a6 | 709 | |
baa7e1fa | 710 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
711 | } |
712 | ||
713 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
714 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
715 | { | |
48454079 | 716 | struct l2cap_chan *chan; |
4e8402a3 MH |
717 | |
718 | BT_DBG("conn %p", conn); | |
719 | ||
baa7e1fa | 720 | read_lock(&conn->chan_lock); |
4e8402a3 | 721 | |
baa7e1fa | 722 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 723 | struct sock *sk = chan->sk; |
baa7e1fa | 724 | |
2af6b9d5 | 725 | if (l2cap_pi(sk)->force_reliable) |
4e8402a3 MH |
726 | sk->sk_err = err; |
727 | } | |
728 | ||
baa7e1fa | 729 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
730 | } |
731 | ||
732 | static void l2cap_info_timeout(unsigned long arg) | |
733 | { | |
734 | struct l2cap_conn *conn = (void *) arg; | |
735 | ||
984947dc | 736 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 737 | conn->info_ident = 0; |
984947dc | 738 | |
4e8402a3 MH |
739 | l2cap_conn_start(conn); |
740 | } | |
741 | ||
1da177e4 LT |
742 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
743 | { | |
0139418c | 744 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 745 | |
0139418c | 746 | if (conn || status) |
1da177e4 LT |
747 | return conn; |
748 | ||
0139418c MH |
749 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
750 | if (!conn) | |
1da177e4 | 751 | return NULL; |
1da177e4 LT |
752 | |
753 | hcon->l2cap_data = conn; | |
754 | conn->hcon = hcon; | |
755 | ||
0139418c MH |
756 | BT_DBG("hcon %p conn %p", hcon, conn); |
757 | ||
acd7d370 VT |
758 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
759 | conn->mtu = hcon->hdev->le_mtu; | |
760 | else | |
761 | conn->mtu = hcon->hdev->acl_mtu; | |
762 | ||
1da177e4 LT |
763 | conn->src = &hcon->hdev->bdaddr; |
764 | conn->dst = &hcon->dst; | |
765 | ||
4e8402a3 MH |
766 | conn->feat_mask = 0; |
767 | ||
1da177e4 | 768 | spin_lock_init(&conn->lock); |
baa7e1fa GP |
769 | rwlock_init(&conn->chan_lock); |
770 | ||
771 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 772 | |
b62f328b VT |
773 | if (hcon->type != LE_LINK) |
774 | setup_timer(&conn->info_timer, l2cap_info_timeout, | |
45054dc1 DY |
775 | (unsigned long) conn); |
776 | ||
2950f21a MH |
777 | conn->disc_reason = 0x13; |
778 | ||
1da177e4 LT |
779 | return conn; |
780 | } | |
781 | ||
0139418c | 782 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1da177e4 | 783 | { |
0139418c | 784 | struct l2cap_conn *conn = hcon->l2cap_data; |
baa7e1fa | 785 | struct l2cap_chan *chan, *l; |
1da177e4 LT |
786 | struct sock *sk; |
787 | ||
0139418c MH |
788 | if (!conn) |
789 | return; | |
1da177e4 LT |
790 | |
791 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
792 | ||
7585b97a | 793 | kfree_skb(conn->rx_skb); |
1da177e4 LT |
794 | |
795 | /* Kill channels */ | |
baa7e1fa | 796 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { |
48454079 | 797 | sk = chan->sk; |
1da177e4 | 798 | bh_lock_sock(sk); |
48454079 | 799 | l2cap_chan_del(chan, err); |
1da177e4 LT |
800 | bh_unlock_sock(sk); |
801 | l2cap_sock_kill(sk); | |
802 | } | |
803 | ||
8e8440f5 DY |
804 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
805 | del_timer_sync(&conn->info_timer); | |
3ab22731 | 806 | |
1da177e4 LT |
807 | hcon->l2cap_data = NULL; |
808 | kfree(conn); | |
1da177e4 LT |
809 | } |
810 | ||
48454079 | 811 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
1da177e4 | 812 | { |
baa7e1fa | 813 | write_lock_bh(&conn->chan_lock); |
48454079 | 814 | __l2cap_chan_add(conn, chan); |
baa7e1fa | 815 | write_unlock_bh(&conn->chan_lock); |
1da177e4 LT |
816 | } |
817 | ||
1da177e4 | 818 | /* ---- Socket interface ---- */ |
1da177e4 LT |
819 | |
820 | /* Find socket with psm and source bdaddr. | |
821 | * Returns closest match. | |
822 | */ | |
e0f0cb56 | 823 | static struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
824 | { |
825 | struct sock *sk = NULL, *sk1 = NULL; | |
826 | struct hlist_node *node; | |
827 | ||
e0f0cb56 GP |
828 | read_lock(&l2cap_sk_list.lock); |
829 | ||
1da177e4 LT |
830 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
831 | if (state && sk->sk_state != state) | |
832 | continue; | |
833 | ||
834 | if (l2cap_pi(sk)->psm == psm) { | |
835 | /* Exact match. */ | |
836 | if (!bacmp(&bt_sk(sk)->src, src)) | |
837 | break; | |
838 | ||
839 | /* Closest match */ | |
840 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
841 | sk1 = sk; | |
842 | } | |
843 | } | |
1da177e4 | 844 | |
1da177e4 | 845 | read_unlock(&l2cap_sk_list.lock); |
e0f0cb56 GP |
846 | |
847 | return node ? sk : sk1; | |
1da177e4 LT |
848 | } |
849 | ||
4e34c50b | 850 | int l2cap_do_connect(struct sock *sk) |
1da177e4 LT |
851 | { |
852 | bdaddr_t *src = &bt_sk(sk)->src; | |
853 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
854 | struct l2cap_conn *conn; | |
48454079 | 855 | struct l2cap_chan *chan; |
1da177e4 LT |
856 | struct hci_conn *hcon; |
857 | struct hci_dev *hdev; | |
09ab6f4c | 858 | __u8 auth_type; |
44d0e48e | 859 | int err; |
1da177e4 | 860 | |
f29972de MH |
861 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
862 | l2cap_pi(sk)->psm); | |
1da177e4 | 863 | |
af05b30b GP |
864 | hdev = hci_get_route(dst, src); |
865 | if (!hdev) | |
1da177e4 LT |
866 | return -EHOSTUNREACH; |
867 | ||
868 | hci_dev_lock_bh(hdev); | |
869 | ||
8556edd3 | 870 | auth_type = l2cap_get_auth_type(sk); |
09ab6f4c | 871 | |
acd7d370 VT |
872 | if (l2cap_pi(sk)->dcid == L2CAP_CID_LE_DATA) |
873 | hcon = hci_connect(hdev, LE_LINK, dst, | |
2af6b9d5 | 874 | l2cap_pi(sk)->sec_level, auth_type); |
acd7d370 VT |
875 | else |
876 | hcon = hci_connect(hdev, ACL_LINK, dst, | |
877 | l2cap_pi(sk)->sec_level, auth_type); | |
878 | ||
30e76272 VT |
879 | if (IS_ERR(hcon)) { |
880 | err = PTR_ERR(hcon); | |
1da177e4 | 881 | goto done; |
30e76272 | 882 | } |
1da177e4 LT |
883 | |
884 | conn = l2cap_conn_add(hcon, 0); | |
885 | if (!conn) { | |
886 | hci_conn_put(hcon); | |
30e76272 | 887 | err = -ENOMEM; |
1da177e4 LT |
888 | goto done; |
889 | } | |
890 | ||
48454079 GP |
891 | chan = l2cap_chan_alloc(sk); |
892 | if (!chan) { | |
893 | hci_conn_put(hcon); | |
894 | err = -ENOMEM; | |
895 | goto done; | |
896 | } | |
897 | ||
1da177e4 LT |
898 | /* Update source addr of the socket */ |
899 | bacpy(src, conn->src); | |
900 | ||
48454079 GP |
901 | l2cap_chan_add(conn, chan); |
902 | ||
903 | l2cap_pi(sk)->chan = chan; | |
1da177e4 LT |
904 | |
905 | sk->sk_state = BT_CONNECT; | |
906 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
907 | ||
908 | if (hcon->state == BT_CONNECTED) { | |
bd3c9e25 GP |
909 | if (sk->sk_type != SOCK_SEQPACKET && |
910 | sk->sk_type != SOCK_STREAM) { | |
1da177e4 | 911 | l2cap_sock_clear_timer(sk); |
d00ef24f JH |
912 | if (l2cap_check_security(sk)) |
913 | sk->sk_state = BT_CONNECTED; | |
79d554a6 | 914 | } else |
fc7f8a7e | 915 | l2cap_do_start(chan); |
1da177e4 LT |
916 | } |
917 | ||
30e76272 VT |
918 | err = 0; |
919 | ||
1da177e4 LT |
920 | done: |
921 | hci_dev_unlock_bh(hdev); | |
922 | hci_dev_put(hdev); | |
923 | return err; | |
924 | } | |
925 | ||
dcba0dba | 926 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 GP |
927 | { |
928 | DECLARE_WAITQUEUE(wait, current); | |
929 | int err = 0; | |
930 | int timeo = HZ/5; | |
931 | ||
2b0b05dd | 932 | add_wait_queue(sk_sleep(sk), &wait); |
6a026610 | 933 | while ((l2cap_pi(sk)->chan->unacked_frames > 0 && l2cap_pi(sk)->conn)) { |
6161c038 GP |
934 | set_current_state(TASK_INTERRUPTIBLE); |
935 | ||
936 | if (!timeo) | |
937 | timeo = HZ/5; | |
938 | ||
939 | if (signal_pending(current)) { | |
940 | err = sock_intr_errno(timeo); | |
941 | break; | |
942 | } | |
943 | ||
944 | release_sock(sk); | |
945 | timeo = schedule_timeout(timeo); | |
946 | lock_sock(sk); | |
947 | ||
948 | err = sock_error(sk); | |
949 | if (err) | |
950 | break; | |
951 | } | |
952 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 953 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
954 | return err; |
955 | } | |
956 | ||
e90bac06 GP |
957 | static void l2cap_monitor_timeout(unsigned long arg) |
958 | { | |
525cd185 GP |
959 | struct l2cap_chan *chan = (void *) arg; |
960 | struct sock *sk = chan->sk; | |
e90bac06 | 961 | |
525cd185 | 962 | BT_DBG("chan %p", chan); |
0e98958d | 963 | |
e686219a | 964 | bh_lock_sock(sk); |
2c03a7a4 | 965 | if (chan->retry_count >= chan->remote_max_tx) { |
e92c8e70 | 966 | l2cap_send_disconn_req(l2cap_pi(sk)->conn, chan, ECONNABORTED); |
b13f5860 | 967 | bh_unlock_sock(sk); |
e90bac06 GP |
968 | return; |
969 | } | |
970 | ||
6a026610 | 971 | chan->retry_count++; |
e90bac06 GP |
972 | __mod_monitor_timer(); |
973 | ||
525cd185 | 974 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
e686219a | 975 | bh_unlock_sock(sk); |
e90bac06 GP |
976 | } |
977 | ||
978 | static void l2cap_retrans_timeout(unsigned long arg) | |
979 | { | |
525cd185 GP |
980 | struct l2cap_chan *chan = (void *) arg; |
981 | struct sock *sk = chan->sk; | |
e90bac06 | 982 | |
49208c9c | 983 | BT_DBG("chan %p", chan); |
0e98958d | 984 | |
e686219a | 985 | bh_lock_sock(sk); |
6a026610 | 986 | chan->retry_count = 1; |
e90bac06 GP |
987 | __mod_monitor_timer(); |
988 | ||
525cd185 | 989 | chan->conn_state |= L2CAP_CONN_WAIT_F; |
e90bac06 | 990 | |
525cd185 | 991 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
e686219a | 992 | bh_unlock_sock(sk); |
e90bac06 GP |
993 | } |
994 | ||
42e5c802 | 995 | static void l2cap_drop_acked_frames(struct l2cap_chan *chan) |
1da177e4 | 996 | { |
1c2acffb | 997 | struct sk_buff *skb; |
1da177e4 | 998 | |
58d35f87 | 999 | while ((skb = skb_peek(&chan->tx_q)) && |
6a026610 | 1000 | chan->unacked_frames) { |
42e5c802 | 1001 | if (bt_cb(skb)->tx_seq == chan->expected_ack_seq) |
1c2acffb | 1002 | break; |
1da177e4 | 1003 | |
58d35f87 | 1004 | skb = skb_dequeue(&chan->tx_q); |
1c2acffb | 1005 | kfree_skb(skb); |
1da177e4 | 1006 | |
6a026610 | 1007 | chan->unacked_frames--; |
1c2acffb | 1008 | } |
1da177e4 | 1009 | |
6a026610 | 1010 | if (!chan->unacked_frames) |
e92c8e70 | 1011 | del_timer(&chan->retrans_timer); |
1c2acffb | 1012 | } |
1da177e4 | 1013 | |
fd83ccdb | 1014 | void l2cap_do_send(struct sock *sk, struct sk_buff *skb) |
1c2acffb GP |
1015 | { |
1016 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
e702112f AE |
1017 | struct hci_conn *hcon = pi->conn->hcon; |
1018 | u16 flags; | |
1c2acffb GP |
1019 | |
1020 | BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len); | |
1da177e4 | 1021 | |
e702112f AE |
1022 | if (!pi->flushable && lmp_no_flush_capable(hcon->hdev)) |
1023 | flags = ACL_START_NO_FLUSH; | |
1024 | else | |
1025 | flags = ACL_START; | |
1026 | ||
1027 | hci_send_acl(hcon, skb, flags); | |
1c2acffb GP |
1028 | } |
1029 | ||
42e5c802 | 1030 | void l2cap_streaming_send(struct l2cap_chan *chan) |
6840ed07 | 1031 | { |
42e5c802 | 1032 | struct sock *sk = chan->sk; |
ccbb84af | 1033 | struct sk_buff *skb; |
6840ed07 | 1034 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
fcc203c3 | 1035 | u16 control, fcs; |
6840ed07 | 1036 | |
58d35f87 | 1037 | while ((skb = skb_dequeue(&chan->tx_q))) { |
ccbb84af | 1038 | control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE); |
42e5c802 | 1039 | control |= chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; |
ccbb84af | 1040 | put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE); |
6840ed07 | 1041 | |
e8235c6b | 1042 | if (pi->fcs == L2CAP_FCS_CRC16) { |
ccbb84af GP |
1043 | fcs = crc16(0, (u8 *)skb->data, skb->len - 2); |
1044 | put_unaligned_le16(fcs, skb->data + skb->len - 2); | |
fcc203c3 GP |
1045 | } |
1046 | ||
ccbb84af | 1047 | l2cap_do_send(sk, skb); |
6840ed07 | 1048 | |
42e5c802 | 1049 | chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; |
6840ed07 | 1050 | } |
6840ed07 GP |
1051 | } |
1052 | ||
525cd185 | 1053 | static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f | 1054 | { |
525cd185 | 1055 | struct sock *sk = chan->sk; |
8f17154f GP |
1056 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
1057 | struct sk_buff *skb, *tx_skb; | |
1058 | u16 control, fcs; | |
8f17154f | 1059 | |
58d35f87 | 1060 | skb = skb_peek(&chan->tx_q); |
f11d676d GP |
1061 | if (!skb) |
1062 | return; | |
8f17154f | 1063 | |
f11d676d GP |
1064 | do { |
1065 | if (bt_cb(skb)->tx_seq == tx_seq) | |
8f17154f | 1066 | break; |
8f17154f | 1067 | |
58d35f87 | 1068 | if (skb_queue_is_last(&chan->tx_q, skb)) |
f11d676d | 1069 | return; |
8f17154f | 1070 | |
58d35f87 | 1071 | } while ((skb = skb_queue_next(&chan->tx_q, skb))); |
8f17154f | 1072 | |
2c03a7a4 GP |
1073 | if (chan->remote_max_tx && |
1074 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
e92c8e70 | 1075 | l2cap_send_disconn_req(pi->conn, chan, ECONNABORTED); |
f11d676d GP |
1076 | return; |
1077 | } | |
1078 | ||
1079 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1080 | bt_cb(skb)->retries++; | |
1081 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
a429b519 | 1082 | control &= L2CAP_CTRL_SAR; |
3cb123d1 | 1083 | |
525cd185 | 1084 | if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { |
3cb123d1 | 1085 | control |= L2CAP_CTRL_FINAL; |
525cd185 | 1086 | chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; |
3cb123d1 | 1087 | } |
95ffa978 | 1088 | |
42e5c802 | 1089 | control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
f11d676d | 1090 | | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); |
3cb123d1 | 1091 | |
f11d676d GP |
1092 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1093 | ||
1094 | if (pi->fcs == L2CAP_FCS_CRC16) { | |
1095 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); | |
1096 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1097 | } | |
1098 | ||
1099 | l2cap_do_send(sk, tx_skb); | |
8f17154f GP |
1100 | } |
1101 | ||
525cd185 | 1102 | int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1103 | { |
1104 | struct sk_buff *skb, *tx_skb; | |
525cd185 | 1105 | struct sock *sk = chan->sk; |
1c2acffb | 1106 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
fcc203c3 | 1107 | u16 control, fcs; |
9a9c6a34 | 1108 | int nsent = 0; |
1c2acffb | 1109 | |
c13ffa62 GP |
1110 | if (sk->sk_state != BT_CONNECTED) |
1111 | return -ENOTCONN; | |
e90bac06 | 1112 | |
58d35f87 | 1113 | while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) { |
1c2acffb | 1114 | |
2c03a7a4 GP |
1115 | if (chan->remote_max_tx && |
1116 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
e92c8e70 | 1117 | l2cap_send_disconn_req(pi->conn, chan, ECONNABORTED); |
e90bac06 GP |
1118 | break; |
1119 | } | |
1120 | ||
e420aba3 AE |
1121 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1122 | ||
e90bac06 GP |
1123 | bt_cb(skb)->retries++; |
1124 | ||
1c2acffb | 1125 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
95ffa978 GP |
1126 | control &= L2CAP_CTRL_SAR; |
1127 | ||
525cd185 | 1128 | if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { |
d5392c8f | 1129 | control |= L2CAP_CTRL_FINAL; |
525cd185 | 1130 | chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; |
d5392c8f | 1131 | } |
42e5c802 GP |
1132 | control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1133 | | (chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); | |
1c2acffb GP |
1134 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1135 | ||
e90bac06 | 1136 | |
e8235c6b | 1137 | if (pi->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1138 | fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); |
1139 | put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); | |
1140 | } | |
1141 | ||
9a9c6a34 GP |
1142 | l2cap_do_send(sk, tx_skb); |
1143 | ||
e90bac06 | 1144 | __mod_retrans_timer(); |
1c2acffb | 1145 | |
42e5c802 GP |
1146 | bt_cb(skb)->tx_seq = chan->next_tx_seq; |
1147 | chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; | |
1c2acffb | 1148 | |
23e9fde2 | 1149 | if (bt_cb(skb)->retries == 1) |
6a026610 | 1150 | chan->unacked_frames++; |
23e9fde2 | 1151 | |
6a026610 | 1152 | chan->frames_sent++; |
1c2acffb | 1153 | |
58d35f87 GP |
1154 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1155 | chan->tx_send_head = NULL; | |
1c2acffb | 1156 | else |
58d35f87 | 1157 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
9e917af1 GP |
1158 | |
1159 | nsent++; | |
1c2acffb GP |
1160 | } |
1161 | ||
9e917af1 GP |
1162 | return nsent; |
1163 | } | |
1164 | ||
525cd185 | 1165 | static int l2cap_retransmit_frames(struct l2cap_chan *chan) |
dfc909be | 1166 | { |
dfc909be GP |
1167 | int ret; |
1168 | ||
58d35f87 GP |
1169 | if (!skb_queue_empty(&chan->tx_q)) |
1170 | chan->tx_send_head = chan->tx_q.next; | |
dfc909be | 1171 | |
42e5c802 | 1172 | chan->next_tx_seq = chan->expected_ack_seq; |
525cd185 | 1173 | ret = l2cap_ertm_send(chan); |
dfc909be GP |
1174 | return ret; |
1175 | } | |
1176 | ||
525cd185 | 1177 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1178 | { |
9e917af1 GP |
1179 | u16 control = 0; |
1180 | ||
42e5c802 | 1181 | control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
9e917af1 | 1182 | |
525cd185 | 1183 | if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
9e917af1 | 1184 | control |= L2CAP_SUPER_RCV_NOT_READY; |
525cd185 GP |
1185 | chan->conn_state |= L2CAP_CONN_RNR_SENT; |
1186 | l2cap_send_sframe(chan, control); | |
9a9c6a34 | 1187 | return; |
9e917af1 | 1188 | } |
dfc909be | 1189 | |
525cd185 | 1190 | if (l2cap_ertm_send(chan) > 0) |
dfc909be GP |
1191 | return; |
1192 | ||
1193 | control |= L2CAP_SUPER_RCV_READY; | |
525cd185 | 1194 | l2cap_send_sframe(chan, control); |
1c2acffb GP |
1195 | } |
1196 | ||
525cd185 | 1197 | static void l2cap_send_srejtail(struct l2cap_chan *chan) |
99b0d4b7 GP |
1198 | { |
1199 | struct srej_list *tail; | |
1200 | u16 control; | |
1201 | ||
1202 | control = L2CAP_SUPER_SELECT_REJECT; | |
1203 | control |= L2CAP_CTRL_FINAL; | |
1204 | ||
39d5a3ee | 1205 | tail = list_entry((&chan->srej_l)->prev, struct srej_list, list); |
99b0d4b7 GP |
1206 | control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
1207 | ||
525cd185 | 1208 | l2cap_send_sframe(chan, control); |
99b0d4b7 GP |
1209 | } |
1210 | ||
1c2acffb GP |
1211 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1212 | { | |
1213 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1214 | struct sk_buff **frag; | |
1215 | int err, sent = 0; | |
1da177e4 | 1216 | |
59203a21 | 1217 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1218 | return -EFAULT; |
1da177e4 LT |
1219 | |
1220 | sent += count; | |
1221 | len -= count; | |
1222 | ||
1223 | /* Continuation fragments (no L2CAP header) */ | |
1224 | frag = &skb_shinfo(skb)->frag_list; | |
1225 | while (len) { | |
1226 | count = min_t(unsigned int, conn->mtu, len); | |
1227 | ||
1228 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1229 | if (!*frag) | |
0175d629 | 1230 | return err; |
1c2acffb GP |
1231 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1232 | return -EFAULT; | |
1da177e4 LT |
1233 | |
1234 | sent += count; | |
1235 | len -= count; | |
1236 | ||
1237 | frag = &(*frag)->next; | |
1238 | } | |
1da177e4 LT |
1239 | |
1240 | return sent; | |
1c2acffb | 1241 | } |
1da177e4 | 1242 | |
fd83ccdb | 1243 | struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len) |
1c2acffb GP |
1244 | { |
1245 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1246 | struct sk_buff *skb; | |
1247 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1248 | struct l2cap_hdr *lh; | |
1249 | ||
1250 | BT_DBG("sk %p len %d", sk, (int)len); | |
1251 | ||
1252 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1253 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1254 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1255 | if (!skb) | |
0175d629 | 1256 | return ERR_PTR(err); |
1c2acffb GP |
1257 | |
1258 | /* Create L2CAP header */ | |
1259 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1260 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1261 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1262 | put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2)); | |
1263 | ||
1264 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1265 | if (unlikely(err < 0)) { | |
1266 | kfree_skb(skb); | |
1267 | return ERR_PTR(err); | |
1268 | } | |
1269 | return skb; | |
1270 | } | |
1271 | ||
fd83ccdb | 1272 | struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len) |
1c2acffb GP |
1273 | { |
1274 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1275 | struct sk_buff *skb; | |
1276 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1277 | struct l2cap_hdr *lh; | |
1278 | ||
1279 | BT_DBG("sk %p len %d", sk, (int)len); | |
1280 | ||
1281 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1282 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1283 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1284 | if (!skb) | |
0175d629 | 1285 | return ERR_PTR(err); |
1c2acffb GP |
1286 | |
1287 | /* Create L2CAP header */ | |
1288 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1289 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1290 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1291 | ||
1292 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1293 | if (unlikely(err < 0)) { | |
1294 | kfree_skb(skb); | |
1295 | return ERR_PTR(err); | |
1296 | } | |
1297 | return skb; | |
1298 | } | |
1299 | ||
fd83ccdb | 1300 | struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen) |
1c2acffb GP |
1301 | { |
1302 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1303 | struct sk_buff *skb; | |
1304 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1305 | struct l2cap_hdr *lh; | |
1306 | ||
1307 | BT_DBG("sk %p len %d", sk, (int)len); | |
1308 | ||
0ee0d208 GP |
1309 | if (!conn) |
1310 | return ERR_PTR(-ENOTCONN); | |
1311 | ||
c74e560c GP |
1312 | if (sdulen) |
1313 | hlen += 2; | |
1314 | ||
fcc203c3 GP |
1315 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1316 | hlen += 2; | |
1317 | ||
1c2acffb GP |
1318 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1319 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1320 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1321 | if (!skb) | |
0175d629 | 1322 | return ERR_PTR(err); |
1c2acffb GP |
1323 | |
1324 | /* Create L2CAP header */ | |
1325 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1326 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1327 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1328 | put_unaligned_le16(control, skb_put(skb, 2)); | |
c74e560c GP |
1329 | if (sdulen) |
1330 | put_unaligned_le16(sdulen, skb_put(skb, 2)); | |
1c2acffb GP |
1331 | |
1332 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1333 | if (unlikely(err < 0)) { | |
1334 | kfree_skb(skb); | |
1335 | return ERR_PTR(err); | |
1336 | } | |
e90bac06 | 1337 | |
fcc203c3 GP |
1338 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1339 | put_unaligned_le16(0, skb_put(skb, 2)); | |
1340 | ||
e90bac06 | 1341 | bt_cb(skb)->retries = 0; |
1c2acffb | 1342 | return skb; |
1da177e4 LT |
1343 | } |
1344 | ||
2c03a7a4 | 1345 | int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
c74e560c | 1346 | { |
2c03a7a4 | 1347 | struct sock *sk = chan->sk; |
c74e560c GP |
1348 | struct sk_buff *skb; |
1349 | struct sk_buff_head sar_queue; | |
1350 | u16 control; | |
1351 | size_t size = 0; | |
1352 | ||
ff12fd64 | 1353 | skb_queue_head_init(&sar_queue); |
c74e560c | 1354 | control = L2CAP_SDU_START; |
2c03a7a4 | 1355 | skb = l2cap_create_iframe_pdu(sk, msg, chan->remote_mps, control, len); |
c74e560c GP |
1356 | if (IS_ERR(skb)) |
1357 | return PTR_ERR(skb); | |
1358 | ||
1359 | __skb_queue_tail(&sar_queue, skb); | |
2c03a7a4 GP |
1360 | len -= chan->remote_mps; |
1361 | size += chan->remote_mps; | |
c74e560c GP |
1362 | |
1363 | while (len > 0) { | |
1364 | size_t buflen; | |
1365 | ||
2c03a7a4 | 1366 | if (len > chan->remote_mps) { |
44651b85 | 1367 | control = L2CAP_SDU_CONTINUE; |
2c03a7a4 | 1368 | buflen = chan->remote_mps; |
c74e560c | 1369 | } else { |
44651b85 | 1370 | control = L2CAP_SDU_END; |
c74e560c GP |
1371 | buflen = len; |
1372 | } | |
1373 | ||
6840ed07 | 1374 | skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0); |
c74e560c GP |
1375 | if (IS_ERR(skb)) { |
1376 | skb_queue_purge(&sar_queue); | |
1377 | return PTR_ERR(skb); | |
1378 | } | |
1379 | ||
1380 | __skb_queue_tail(&sar_queue, skb); | |
1381 | len -= buflen; | |
1382 | size += buflen; | |
c74e560c | 1383 | } |
58d35f87 GP |
1384 | skb_queue_splice_tail(&sar_queue, &chan->tx_q); |
1385 | if (chan->tx_send_head == NULL) | |
1386 | chan->tx_send_head = sar_queue.next; | |
c74e560c GP |
1387 | |
1388 | return size; | |
1389 | } | |
1390 | ||
1da177e4 LT |
1391 | static void l2cap_chan_ready(struct sock *sk) |
1392 | { | |
1393 | struct sock *parent = bt_sk(sk)->parent; | |
1394 | ||
1395 | BT_DBG("sk %p, parent %p", sk, parent); | |
1396 | ||
1397 | l2cap_pi(sk)->conf_state = 0; | |
1398 | l2cap_sock_clear_timer(sk); | |
1399 | ||
1400 | if (!parent) { | |
1401 | /* Outgoing channel. | |
1402 | * Wake up socket sleeping on connect. | |
1403 | */ | |
1404 | sk->sk_state = BT_CONNECTED; | |
1405 | sk->sk_state_change(sk); | |
1406 | } else { | |
1407 | /* Incoming channel. | |
1408 | * Wake up socket sleeping on accept. | |
1409 | */ | |
1410 | parent->sk_data_ready(parent, 0); | |
1411 | } | |
1412 | } | |
1413 | ||
1414 | /* Copy frame to all raw sockets on that connection */ | |
1415 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
1416 | { | |
1da177e4 | 1417 | struct sk_buff *nskb; |
48454079 | 1418 | struct l2cap_chan *chan; |
1da177e4 LT |
1419 | |
1420 | BT_DBG("conn %p", conn); | |
1421 | ||
baa7e1fa GP |
1422 | read_lock(&conn->chan_lock); |
1423 | list_for_each_entry(chan, &conn->chan_l, list) { | |
48454079 | 1424 | struct sock *sk = chan->sk; |
1da177e4 LT |
1425 | if (sk->sk_type != SOCK_RAW) |
1426 | continue; | |
1427 | ||
1428 | /* Don't send frame to the socket it came from */ | |
1429 | if (skb->sk == sk) | |
1430 | continue; | |
af05b30b GP |
1431 | nskb = skb_clone(skb, GFP_ATOMIC); |
1432 | if (!nskb) | |
1da177e4 LT |
1433 | continue; |
1434 | ||
1435 | if (sock_queue_rcv_skb(sk, nskb)) | |
1436 | kfree_skb(nskb); | |
1437 | } | |
baa7e1fa | 1438 | read_unlock(&conn->chan_lock); |
1da177e4 LT |
1439 | } |
1440 | ||
1441 | /* ---- L2CAP signalling commands ---- */ | |
1442 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
1443 | u8 code, u8 ident, u16 dlen, void *data) | |
1444 | { | |
1445 | struct sk_buff *skb, **frag; | |
1446 | struct l2cap_cmd_hdr *cmd; | |
1447 | struct l2cap_hdr *lh; | |
1448 | int len, count; | |
1449 | ||
af05b30b GP |
1450 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
1451 | conn, code, ident, dlen); | |
1da177e4 LT |
1452 | |
1453 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
1454 | count = min_t(unsigned int, conn->mtu, len); | |
1455 | ||
1456 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
1457 | if (!skb) | |
1458 | return NULL; | |
1459 | ||
1460 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 1461 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
1462 | |
1463 | if (conn->hcon->type == LE_LINK) | |
1464 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); | |
1465 | else | |
1466 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); | |
1da177e4 LT |
1467 | |
1468 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
1469 | cmd->code = code; | |
1470 | cmd->ident = ident; | |
aca3192c | 1471 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
1472 | |
1473 | if (dlen) { | |
1474 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
1475 | memcpy(skb_put(skb, count), data, count); | |
1476 | data += count; | |
1477 | } | |
1478 | ||
1479 | len -= skb->len; | |
1480 | ||
1481 | /* Continuation fragments (no L2CAP header) */ | |
1482 | frag = &skb_shinfo(skb)->frag_list; | |
1483 | while (len) { | |
1484 | count = min_t(unsigned int, conn->mtu, len); | |
1485 | ||
1486 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
1487 | if (!*frag) | |
1488 | goto fail; | |
1489 | ||
1490 | memcpy(skb_put(*frag, count), data, count); | |
1491 | ||
1492 | len -= count; | |
1493 | data += count; | |
1494 | ||
1495 | frag = &(*frag)->next; | |
1496 | } | |
1497 | ||
1498 | return skb; | |
1499 | ||
1500 | fail: | |
1501 | kfree_skb(skb); | |
1502 | return NULL; | |
1503 | } | |
1504 | ||
1505 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
1506 | { | |
1507 | struct l2cap_conf_opt *opt = *ptr; | |
1508 | int len; | |
1509 | ||
1510 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
1511 | *ptr += len; | |
1512 | ||
1513 | *type = opt->type; | |
1514 | *olen = opt->len; | |
1515 | ||
1516 | switch (opt->len) { | |
1517 | case 1: | |
1518 | *val = *((u8 *) opt->val); | |
1519 | break; | |
1520 | ||
1521 | case 2: | |
bfaaeb3e | 1522 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
1523 | break; |
1524 | ||
1525 | case 4: | |
bfaaeb3e | 1526 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
1527 | break; |
1528 | ||
1529 | default: | |
1530 | *val = (unsigned long) opt->val; | |
1531 | break; | |
1532 | } | |
1533 | ||
1534 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
1535 | return len; | |
1536 | } | |
1537 | ||
1da177e4 LT |
1538 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
1539 | { | |
1540 | struct l2cap_conf_opt *opt = *ptr; | |
1541 | ||
1542 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
1543 | ||
1544 | opt->type = type; | |
1545 | opt->len = len; | |
1546 | ||
1547 | switch (len) { | |
1548 | case 1: | |
1549 | *((u8 *) opt->val) = val; | |
1550 | break; | |
1551 | ||
1552 | case 2: | |
4f8b691c | 1553 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
1554 | break; |
1555 | ||
1556 | case 4: | |
4f8b691c | 1557 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
1558 | break; |
1559 | ||
1560 | default: | |
1561 | memcpy(opt->val, (void *) val, len); | |
1562 | break; | |
1563 | } | |
1564 | ||
1565 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
1566 | } | |
1567 | ||
c1b4f43b GP |
1568 | static void l2cap_ack_timeout(unsigned long arg) |
1569 | { | |
525cd185 | 1570 | struct l2cap_chan *chan = (void *) arg; |
c1b4f43b | 1571 | |
525cd185 GP |
1572 | bh_lock_sock(chan->sk); |
1573 | l2cap_send_ack(chan); | |
1574 | bh_unlock_sock(chan->sk); | |
c1b4f43b GP |
1575 | } |
1576 | ||
525cd185 | 1577 | static inline void l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 1578 | { |
525cd185 GP |
1579 | struct sock *sk = chan->sk; |
1580 | ||
42e5c802 | 1581 | chan->expected_ack_seq = 0; |
6a026610 | 1582 | chan->unacked_frames = 0; |
42e5c802 | 1583 | chan->buffer_seq = 0; |
6a026610 GP |
1584 | chan->num_acked = 0; |
1585 | chan->frames_sent = 0; | |
0565c1c2 | 1586 | |
e92c8e70 GP |
1587 | setup_timer(&chan->retrans_timer, l2cap_retrans_timeout, |
1588 | (unsigned long) chan); | |
1589 | setup_timer(&chan->monitor_timer, l2cap_monitor_timeout, | |
1590 | (unsigned long) chan); | |
1591 | setup_timer(&chan->ack_timer, l2cap_ack_timeout, (unsigned long) chan); | |
0565c1c2 | 1592 | |
f1c6775b GP |
1593 | skb_queue_head_init(&chan->srej_q); |
1594 | skb_queue_head_init(&chan->busy_q); | |
1890d36b | 1595 | |
39d5a3ee GP |
1596 | INIT_LIST_HEAD(&chan->srej_l); |
1597 | ||
311bb895 | 1598 | INIT_WORK(&chan->busy_work, l2cap_busy_work); |
218bb9df GP |
1599 | |
1600 | sk->sk_backlog_rcv = l2cap_ertm_data_rcv; | |
0565c1c2 GP |
1601 | } |
1602 | ||
f2fcfcd6 GP |
1603 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
1604 | { | |
1605 | switch (mode) { | |
1606 | case L2CAP_MODE_STREAMING: | |
1607 | case L2CAP_MODE_ERTM: | |
1608 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
1609 | return mode; | |
1610 | /* fall through */ | |
1611 | default: | |
1612 | return L2CAP_MODE_BASIC; | |
1613 | } | |
1614 | } | |
1615 | ||
710f9b0a | 1616 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 1617 | { |
49208c9c | 1618 | struct l2cap_pinfo *pi = l2cap_pi(chan->sk); |
1da177e4 | 1619 | struct l2cap_conf_req *req = data; |
bd3c9e25 | 1620 | struct l2cap_conf_rfc rfc = { .mode = pi->mode }; |
1da177e4 LT |
1621 | void *ptr = req->data; |
1622 | ||
49208c9c | 1623 | BT_DBG("chan %p", chan); |
1da177e4 | 1624 | |
73ffa904 | 1625 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
1626 | goto done; |
1627 | ||
1628 | switch (pi->mode) { | |
1629 | case L2CAP_MODE_STREAMING: | |
1630 | case L2CAP_MODE_ERTM: | |
2ba13ed6 | 1631 | if (pi->conf_state & L2CAP_CONF_STATE2_DEVICE) |
85eb53c6 | 1632 | break; |
85eb53c6 | 1633 | |
2ba13ed6 | 1634 | /* fall through */ |
f2fcfcd6 GP |
1635 | default: |
1636 | pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); | |
1637 | break; | |
1638 | } | |
1639 | ||
1640 | done: | |
7990681c GP |
1641 | if (pi->imtu != L2CAP_DEFAULT_MTU) |
1642 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
1643 | ||
65c7c491 MH |
1644 | switch (pi->mode) { |
1645 | case L2CAP_MODE_BASIC: | |
63406504 GP |
1646 | if (!(pi->conn->feat_mask & L2CAP_FEAT_ERTM) && |
1647 | !(pi->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
1648 | break; | |
1649 | ||
62547752 GP |
1650 | rfc.mode = L2CAP_MODE_BASIC; |
1651 | rfc.txwin_size = 0; | |
1652 | rfc.max_transmit = 0; | |
1653 | rfc.retrans_timeout = 0; | |
1654 | rfc.monitor_timeout = 0; | |
1655 | rfc.max_pdu_size = 0; | |
1656 | ||
63406504 GP |
1657 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1658 | (unsigned long) &rfc); | |
65c7c491 MH |
1659 | break; |
1660 | ||
1661 | case L2CAP_MODE_ERTM: | |
1662 | rfc.mode = L2CAP_MODE_ERTM; | |
14b5aa71 | 1663 | rfc.txwin_size = pi->tx_win; |
68d7f0ce | 1664 | rfc.max_transmit = pi->max_tx; |
f2fcfcd6 GP |
1665 | rfc.retrans_timeout = 0; |
1666 | rfc.monitor_timeout = 0; | |
c74e560c | 1667 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 1668 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 1669 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
f2fcfcd6 | 1670 | |
63406504 GP |
1671 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1672 | (unsigned long) &rfc); | |
1673 | ||
fcc203c3 GP |
1674 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
1675 | break; | |
1676 | ||
1677 | if (pi->fcs == L2CAP_FCS_NONE || | |
1678 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
1679 | pi->fcs = L2CAP_FCS_NONE; | |
1680 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
1681 | } | |
f2fcfcd6 GP |
1682 | break; |
1683 | ||
1684 | case L2CAP_MODE_STREAMING: | |
1685 | rfc.mode = L2CAP_MODE_STREAMING; | |
1686 | rfc.txwin_size = 0; | |
1687 | rfc.max_transmit = 0; | |
1688 | rfc.retrans_timeout = 0; | |
1689 | rfc.monitor_timeout = 0; | |
c74e560c | 1690 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 1691 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 1692 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
65c7c491 | 1693 | |
63406504 GP |
1694 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1695 | (unsigned long) &rfc); | |
1696 | ||
fcc203c3 GP |
1697 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
1698 | break; | |
1699 | ||
1700 | if (pi->fcs == L2CAP_FCS_NONE || | |
1701 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
1702 | pi->fcs = L2CAP_FCS_NONE; | |
1703 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
1704 | } | |
65c7c491 MH |
1705 | break; |
1706 | } | |
1da177e4 | 1707 | |
aca3192c YH |
1708 | req->dcid = cpu_to_le16(pi->dcid); |
1709 | req->flags = cpu_to_le16(0); | |
1da177e4 LT |
1710 | |
1711 | return ptr - data; | |
1712 | } | |
1713 | ||
73ffa904 | 1714 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 1715 | { |
73ffa904 | 1716 | struct l2cap_pinfo *pi = l2cap_pi(chan->sk); |
5dee9e7c MH |
1717 | struct l2cap_conf_rsp *rsp = data; |
1718 | void *ptr = rsp->data; | |
73ffa904 GP |
1719 | void *req = chan->conf_req; |
1720 | int len = chan->conf_len; | |
5dee9e7c MH |
1721 | int type, hint, olen; |
1722 | unsigned long val; | |
6464f35f | 1723 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
861d6882 | 1724 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 1725 | u16 result = L2CAP_CONF_SUCCESS; |
1da177e4 | 1726 | |
73ffa904 | 1727 | BT_DBG("chan %p", chan); |
820ae1b8 | 1728 | |
5dee9e7c MH |
1729 | while (len >= L2CAP_CONF_OPT_SIZE) { |
1730 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 1731 | |
589d2746 | 1732 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 1733 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
1734 | |
1735 | switch (type) { | |
1736 | case L2CAP_CONF_MTU: | |
861d6882 | 1737 | mtu = val; |
5dee9e7c MH |
1738 | break; |
1739 | ||
1740 | case L2CAP_CONF_FLUSH_TO: | |
1741 | pi->flush_to = val; | |
1742 | break; | |
1743 | ||
1744 | case L2CAP_CONF_QOS: | |
1745 | break; | |
1746 | ||
6464f35f MH |
1747 | case L2CAP_CONF_RFC: |
1748 | if (olen == sizeof(rfc)) | |
1749 | memcpy(&rfc, (void *) val, olen); | |
1750 | break; | |
1751 | ||
fcc203c3 GP |
1752 | case L2CAP_CONF_FCS: |
1753 | if (val == L2CAP_FCS_NONE) | |
1754 | pi->conf_state |= L2CAP_CONF_NO_FCS_RECV; | |
1755 | ||
1756 | break; | |
1757 | ||
5dee9e7c MH |
1758 | default: |
1759 | if (hint) | |
1760 | break; | |
1761 | ||
1762 | result = L2CAP_CONF_UNKNOWN; | |
1763 | *((u8 *) ptr++) = type; | |
1764 | break; | |
1765 | } | |
1766 | } | |
1767 | ||
73ffa904 | 1768 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
1769 | goto done; |
1770 | ||
1771 | switch (pi->mode) { | |
1772 | case L2CAP_MODE_STREAMING: | |
1773 | case L2CAP_MODE_ERTM: | |
85eb53c6 GP |
1774 | if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) { |
1775 | pi->mode = l2cap_select_mode(rfc.mode, | |
1776 | pi->conn->feat_mask); | |
1777 | break; | |
1778 | } | |
1779 | ||
742e519b | 1780 | if (pi->mode != rfc.mode) |
f2fcfcd6 | 1781 | return -ECONNREFUSED; |
742e519b | 1782 | |
f2fcfcd6 | 1783 | break; |
f2fcfcd6 GP |
1784 | } |
1785 | ||
1786 | done: | |
1787 | if (pi->mode != rfc.mode) { | |
1788 | result = L2CAP_CONF_UNACCEPT; | |
1789 | rfc.mode = pi->mode; | |
1790 | ||
73ffa904 | 1791 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
1792 | return -ECONNREFUSED; |
1793 | ||
1794 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1795 | sizeof(rfc), (unsigned long) &rfc); | |
1796 | } | |
1797 | ||
1798 | ||
5dee9e7c MH |
1799 | if (result == L2CAP_CONF_SUCCESS) { |
1800 | /* Configure output options and let the other side know | |
1801 | * which ones we don't like. */ | |
1802 | ||
f2fcfcd6 GP |
1803 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
1804 | result = L2CAP_CONF_UNACCEPT; | |
1805 | else { | |
1806 | pi->omtu = mtu; | |
1807 | pi->conf_state |= L2CAP_CONF_MTU_DONE; | |
1808 | } | |
1809 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); | |
6464f35f | 1810 | |
f2fcfcd6 GP |
1811 | switch (rfc.mode) { |
1812 | case L2CAP_MODE_BASIC: | |
1813 | pi->fcs = L2CAP_FCS_NONE; | |
1814 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
1815 | break; | |
1816 | ||
1817 | case L2CAP_MODE_ERTM: | |
2c03a7a4 GP |
1818 | chan->remote_tx_win = rfc.txwin_size; |
1819 | chan->remote_max_tx = rfc.max_transmit; | |
86b1b263 MM |
1820 | |
1821 | if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) | |
1822 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); | |
1c762159 | 1823 | |
2c03a7a4 | 1824 | chan->remote_mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 | 1825 | |
10467e9e GP |
1826 | rfc.retrans_timeout = |
1827 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
1828 | rfc.monitor_timeout = | |
1829 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 GP |
1830 | |
1831 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
1832 | |
1833 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1834 | sizeof(rfc), (unsigned long) &rfc); | |
1835 | ||
f2fcfcd6 GP |
1836 | break; |
1837 | ||
1838 | case L2CAP_MODE_STREAMING: | |
86b1b263 MM |
1839 | if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) |
1840 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); | |
1c762159 | 1841 | |
2c03a7a4 | 1842 | chan->remote_mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
1843 | |
1844 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
1845 | |
1846 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1847 | sizeof(rfc), (unsigned long) &rfc); | |
1848 | ||
f2fcfcd6 GP |
1849 | break; |
1850 | ||
1851 | default: | |
5dee9e7c | 1852 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 1853 | |
6464f35f | 1854 | memset(&rfc, 0, sizeof(rfc)); |
f2fcfcd6 GP |
1855 | rfc.mode = pi->mode; |
1856 | } | |
6464f35f | 1857 | |
f2fcfcd6 GP |
1858 | if (result == L2CAP_CONF_SUCCESS) |
1859 | pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; | |
1860 | } | |
5dee9e7c MH |
1861 | rsp->scid = cpu_to_le16(pi->dcid); |
1862 | rsp->result = cpu_to_le16(result); | |
1863 | rsp->flags = cpu_to_le16(0x0000); | |
1864 | ||
1865 | return ptr - data; | |
1da177e4 LT |
1866 | } |
1867 | ||
f2fcfcd6 GP |
1868 | static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result) |
1869 | { | |
1870 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1871 | struct l2cap_conf_req *req = data; | |
1872 | void *ptr = req->data; | |
1873 | int type, olen; | |
1874 | unsigned long val; | |
1875 | struct l2cap_conf_rfc rfc; | |
1876 | ||
1877 | BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data); | |
1878 | ||
1879 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
1880 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
1881 | ||
1882 | switch (type) { | |
1883 | case L2CAP_CONF_MTU: | |
1884 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
1885 | *result = L2CAP_CONF_UNACCEPT; | |
8183b775 | 1886 | pi->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 1887 | } else |
8183b775 AE |
1888 | pi->imtu = val; |
1889 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
f2fcfcd6 GP |
1890 | break; |
1891 | ||
1892 | case L2CAP_CONF_FLUSH_TO: | |
1893 | pi->flush_to = val; | |
1894 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, | |
1895 | 2, pi->flush_to); | |
1896 | break; | |
1897 | ||
1898 | case L2CAP_CONF_RFC: | |
1899 | if (olen == sizeof(rfc)) | |
1900 | memcpy(&rfc, (void *)val, olen); | |
1901 | ||
1902 | if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) && | |
1903 | rfc.mode != pi->mode) | |
1904 | return -ECONNREFUSED; | |
1905 | ||
f2fcfcd6 GP |
1906 | pi->fcs = 0; |
1907 | ||
1908 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1909 | sizeof(rfc), (unsigned long) &rfc); | |
1910 | break; | |
1911 | } | |
1912 | } | |
1913 | ||
6c2ea7a8 GP |
1914 | if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode) |
1915 | return -ECONNREFUSED; | |
1916 | ||
1917 | pi->mode = rfc.mode; | |
1918 | ||
f2fcfcd6 GP |
1919 | if (*result == L2CAP_CONF_SUCCESS) { |
1920 | switch (rfc.mode) { | |
1921 | case L2CAP_MODE_ERTM: | |
10467e9e GP |
1922 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
1923 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
1c762159 | 1924 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
1925 | break; |
1926 | case L2CAP_MODE_STREAMING: | |
1c762159 | 1927 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
1928 | } |
1929 | } | |
1930 | ||
1931 | req->dcid = cpu_to_le16(pi->dcid); | |
1932 | req->flags = cpu_to_le16(0x0000); | |
1933 | ||
1934 | return ptr - data; | |
1935 | } | |
1936 | ||
5dee9e7c | 1937 | static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) |
1da177e4 LT |
1938 | { |
1939 | struct l2cap_conf_rsp *rsp = data; | |
1940 | void *ptr = rsp->data; | |
1da177e4 | 1941 | |
5dee9e7c | 1942 | BT_DBG("sk %p", sk); |
1da177e4 | 1943 | |
aca3192c | 1944 | rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
5dee9e7c | 1945 | rsp->result = cpu_to_le16(result); |
aca3192c | 1946 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
1947 | |
1948 | return ptr - data; | |
1949 | } | |
1950 | ||
710f9b0a GP |
1951 | void __l2cap_connect_rsp_defer(struct sock *sk) |
1952 | { | |
1953 | struct l2cap_conn_rsp rsp; | |
1954 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1955 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; | |
1956 | u8 buf[128]; | |
1957 | ||
1958 | sk->sk_state = BT_CONFIG; | |
1959 | ||
1960 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1961 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
1962 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
1963 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
1964 | l2cap_send_cmd(conn, chan->ident, | |
1965 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
1966 | ||
1967 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) | |
1968 | return; | |
1969 | ||
1970 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
1971 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
1972 | l2cap_build_conf_req(chan, buf), buf); | |
1973 | chan->num_conf_req++; | |
1974 | } | |
1975 | ||
7b1c0049 GP |
1976 | static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len) |
1977 | { | |
1978 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1979 | int type, olen; | |
1980 | unsigned long val; | |
1981 | struct l2cap_conf_rfc rfc; | |
1982 | ||
1983 | BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len); | |
1984 | ||
1985 | if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING)) | |
1986 | return; | |
1987 | ||
1988 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
1989 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
1990 | ||
1991 | switch (type) { | |
1992 | case L2CAP_CONF_RFC: | |
1993 | if (olen == sizeof(rfc)) | |
1994 | memcpy(&rfc, (void *)val, olen); | |
1995 | goto done; | |
1996 | } | |
1997 | } | |
1998 | ||
1999 | done: | |
2000 | switch (rfc.mode) { | |
2001 | case L2CAP_MODE_ERTM: | |
10467e9e GP |
2002 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2003 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
7b1c0049 GP |
2004 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
2005 | break; | |
2006 | case L2CAP_MODE_STREAMING: | |
2007 | pi->mps = le16_to_cpu(rfc.max_pdu_size); | |
2008 | } | |
2009 | } | |
2010 | ||
4e8402a3 MH |
2011 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2012 | { | |
2013 | struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; | |
2014 | ||
2015 | if (rej->reason != 0x0000) | |
2016 | return 0; | |
2017 | ||
2018 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2019 | cmd->ident == conn->info_ident) { | |
4e8402a3 | 2020 | del_timer(&conn->info_timer); |
984947dc MH |
2021 | |
2022 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2023 | conn->info_ident = 0; |
984947dc | 2024 | |
4e8402a3 MH |
2025 | l2cap_conn_start(conn); |
2026 | } | |
2027 | ||
2028 | return 0; | |
2029 | } | |
2030 | ||
1da177e4 LT |
2031 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2032 | { | |
1da177e4 LT |
2033 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
2034 | struct l2cap_conn_rsp rsp; | |
73ffa904 | 2035 | struct l2cap_chan *chan = NULL; |
d793fe8c | 2036 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 2037 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2038 | |
2039 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2040 | __le16 psm = req->psm; |
1da177e4 LT |
2041 | |
2042 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
2043 | ||
2044 | /* Check if we have socket listening on psm */ | |
2045 | parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); | |
2046 | if (!parent) { | |
2047 | result = L2CAP_CR_BAD_PSM; | |
2048 | goto sendresp; | |
2049 | } | |
2050 | ||
e0f0cb56 GP |
2051 | bh_lock_sock(parent); |
2052 | ||
e7c29cb1 MH |
2053 | /* Check if the ACL is secure enough (if not SDP) */ |
2054 | if (psm != cpu_to_le16(0x0001) && | |
2055 | !hci_conn_check_link_mode(conn->hcon)) { | |
2950f21a | 2056 | conn->disc_reason = 0x05; |
e7c29cb1 MH |
2057 | result = L2CAP_CR_SEC_BLOCK; |
2058 | goto response; | |
2059 | } | |
2060 | ||
1da177e4 LT |
2061 | result = L2CAP_CR_NO_MEM; |
2062 | ||
2063 | /* Check for backlog size */ | |
2064 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2065 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2066 | goto response; |
2067 | } | |
2068 | ||
3b1e0a65 | 2069 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); |
1da177e4 LT |
2070 | if (!sk) |
2071 | goto response; | |
2072 | ||
48454079 GP |
2073 | chan = l2cap_chan_alloc(sk); |
2074 | if (!chan) { | |
2075 | l2cap_sock_kill(sk); | |
2076 | goto response; | |
2077 | } | |
2078 | ||
baa7e1fa | 2079 | write_lock_bh(&conn->chan_lock); |
1da177e4 LT |
2080 | |
2081 | /* Check if we already have channel with that dcid */ | |
baa7e1fa GP |
2082 | if (__l2cap_get_chan_by_dcid(conn, scid)) { |
2083 | write_unlock_bh(&conn->chan_lock); | |
1da177e4 LT |
2084 | sock_set_flag(sk, SOCK_ZAPPED); |
2085 | l2cap_sock_kill(sk); | |
2086 | goto response; | |
2087 | } | |
2088 | ||
2089 | hci_conn_hold(conn->hcon); | |
2090 | ||
2091 | l2cap_sock_init(sk, parent); | |
2092 | bacpy(&bt_sk(sk)->src, conn->src); | |
2093 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
2094 | l2cap_pi(sk)->psm = psm; | |
2095 | l2cap_pi(sk)->dcid = scid; | |
2096 | ||
d1010240 GP |
2097 | bt_accept_enqueue(parent, sk); |
2098 | ||
48454079 GP |
2099 | __l2cap_chan_add(conn, chan); |
2100 | ||
2101 | l2cap_pi(sk)->chan = chan; | |
2102 | ||
1da177e4 LT |
2103 | dcid = l2cap_pi(sk)->scid; |
2104 | ||
2105 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
2106 | ||
fc7f8a7e | 2107 | chan->ident = cmd->ident; |
1da177e4 | 2108 | |
984947dc | 2109 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
2af6b9d5 | 2110 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
2111 | if (bt_sk(sk)->defer_setup) { |
2112 | sk->sk_state = BT_CONNECT2; | |
2113 | result = L2CAP_CR_PEND; | |
2114 | status = L2CAP_CS_AUTHOR_PEND; | |
2115 | parent->sk_data_ready(parent, 0); | |
2116 | } else { | |
2117 | sk->sk_state = BT_CONFIG; | |
2118 | result = L2CAP_CR_SUCCESS; | |
2119 | status = L2CAP_CS_NO_INFO; | |
2120 | } | |
79d554a6 MH |
2121 | } else { |
2122 | sk->sk_state = BT_CONNECT2; | |
2123 | result = L2CAP_CR_PEND; | |
2124 | status = L2CAP_CS_AUTHEN_PEND; | |
2125 | } | |
2126 | } else { | |
2127 | sk->sk_state = BT_CONNECT2; | |
2128 | result = L2CAP_CR_PEND; | |
2129 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2130 | } |
2131 | ||
baa7e1fa | 2132 | write_unlock_bh(&conn->chan_lock); |
1da177e4 LT |
2133 | |
2134 | response: | |
2135 | bh_unlock_sock(parent); | |
2136 | ||
2137 | sendresp: | |
aca3192c YH |
2138 | rsp.scid = cpu_to_le16(scid); |
2139 | rsp.dcid = cpu_to_le16(dcid); | |
2140 | rsp.result = cpu_to_le16(result); | |
2141 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2142 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2143 | |
2144 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2145 | struct l2cap_info_req info; | |
2146 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2147 | ||
2148 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2149 | conn->info_ident = l2cap_get_ident(conn); | |
2150 | ||
2151 | mod_timer(&conn->info_timer, jiffies + | |
2152 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
2153 | ||
2154 | l2cap_send_cmd(conn, conn->info_ident, | |
2155 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2156 | } | |
2157 | ||
73ffa904 | 2158 | if (chan && !(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) && |
e9aeb2dd GP |
2159 | result == L2CAP_CR_SUCCESS) { |
2160 | u8 buf[128]; | |
2161 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
2162 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
73ffa904 GP |
2163 | l2cap_build_conf_req(chan, buf), buf); |
2164 | chan->num_conf_req++; | |
e9aeb2dd GP |
2165 | } |
2166 | ||
1da177e4 LT |
2167 | return 0; |
2168 | } | |
2169 | ||
2170 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2171 | { | |
2172 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2173 | u16 scid, dcid, result, status; | |
48454079 | 2174 | struct l2cap_chan *chan; |
1da177e4 LT |
2175 | struct sock *sk; |
2176 | u8 req[128]; | |
2177 | ||
2178 | scid = __le16_to_cpu(rsp->scid); | |
2179 | dcid = __le16_to_cpu(rsp->dcid); | |
2180 | result = __le16_to_cpu(rsp->result); | |
2181 | status = __le16_to_cpu(rsp->status); | |
2182 | ||
2183 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2184 | ||
2185 | if (scid) { | |
baa7e1fa | 2186 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2187 | if (!chan) |
57d3b22b | 2188 | return -EFAULT; |
1da177e4 | 2189 | } else { |
baa7e1fa | 2190 | chan = l2cap_get_chan_by_ident(conn, cmd->ident); |
48454079 | 2191 | if (!chan) |
57d3b22b | 2192 | return -EFAULT; |
1da177e4 LT |
2193 | } |
2194 | ||
48454079 GP |
2195 | sk = chan->sk; |
2196 | ||
1da177e4 LT |
2197 | switch (result) { |
2198 | case L2CAP_CR_SUCCESS: | |
2199 | sk->sk_state = BT_CONFIG; | |
fc7f8a7e | 2200 | chan->ident = 0; |
1da177e4 | 2201 | l2cap_pi(sk)->dcid = dcid; |
6a8d3010 MH |
2202 | l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; |
2203 | ||
e9aeb2dd GP |
2204 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) |
2205 | break; | |
2206 | ||
2207 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
2208 | ||
1da177e4 | 2209 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2210 | l2cap_build_conf_req(chan, req), req); |
2211 | chan->num_conf_req++; | |
1da177e4 LT |
2212 | break; |
2213 | ||
2214 | case L2CAP_CR_PEND: | |
6a8d3010 | 2215 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 LT |
2216 | break; |
2217 | ||
2218 | default: | |
a49184c2 AE |
2219 | /* don't delete l2cap channel if sk is owned by user */ |
2220 | if (sock_owned_by_user(sk)) { | |
2221 | sk->sk_state = BT_DISCONN; | |
2222 | l2cap_sock_clear_timer(sk); | |
2223 | l2cap_sock_set_timer(sk, HZ / 5); | |
2224 | break; | |
2225 | } | |
2226 | ||
48454079 | 2227 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
2228 | break; |
2229 | } | |
2230 | ||
2231 | bh_unlock_sock(sk); | |
2232 | return 0; | |
2233 | } | |
2234 | ||
8c462b60 MM |
2235 | static inline void set_default_fcs(struct l2cap_pinfo *pi) |
2236 | { | |
2237 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
2238 | * sides request it. | |
2239 | */ | |
2240 | if (pi->mode != L2CAP_MODE_ERTM && pi->mode != L2CAP_MODE_STREAMING) | |
2241 | pi->fcs = L2CAP_FCS_NONE; | |
2242 | else if (!(pi->conf_state & L2CAP_CONF_NO_FCS_RECV)) | |
2243 | pi->fcs = L2CAP_FCS_CRC16; | |
2244 | } | |
2245 | ||
88219a0f | 2246 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
2247 | { |
2248 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
2249 | u16 dcid, flags; | |
2250 | u8 rsp[64]; | |
48454079 | 2251 | struct l2cap_chan *chan; |
1da177e4 | 2252 | struct sock *sk; |
5dee9e7c | 2253 | int len; |
1da177e4 LT |
2254 | |
2255 | dcid = __le16_to_cpu(req->dcid); | |
2256 | flags = __le16_to_cpu(req->flags); | |
2257 | ||
2258 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
2259 | ||
baa7e1fa | 2260 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2261 | if (!chan) |
1da177e4 LT |
2262 | return -ENOENT; |
2263 | ||
48454079 GP |
2264 | sk = chan->sk; |
2265 | ||
df6bd743 GP |
2266 | if (sk->sk_state != BT_CONFIG) { |
2267 | struct l2cap_cmd_rej rej; | |
2268 | ||
2269 | rej.reason = cpu_to_le16(0x0002); | |
2270 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, | |
2271 | sizeof(rej), &rej); | |
354f60a9 | 2272 | goto unlock; |
df6bd743 | 2273 | } |
354f60a9 | 2274 | |
5dee9e7c | 2275 | /* Reject if config buffer is too small. */ |
88219a0f | 2276 | len = cmd_len - sizeof(*req); |
73ffa904 | 2277 | if (chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c MH |
2278 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
2279 | l2cap_build_conf_rsp(sk, rsp, | |
2280 | L2CAP_CONF_REJECT, flags), rsp); | |
2281 | goto unlock; | |
2282 | } | |
2283 | ||
2284 | /* Store config. */ | |
73ffa904 GP |
2285 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
2286 | chan->conf_len += len; | |
1da177e4 LT |
2287 | |
2288 | if (flags & 0x0001) { | |
2289 | /* Incomplete config. Send empty response. */ | |
2290 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
5dee9e7c MH |
2291 | l2cap_build_conf_rsp(sk, rsp, |
2292 | L2CAP_CONF_SUCCESS, 0x0001), rsp); | |
1da177e4 LT |
2293 | goto unlock; |
2294 | } | |
2295 | ||
2296 | /* Complete config. */ | |
73ffa904 | 2297 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 2298 | if (len < 0) { |
e92c8e70 | 2299 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 2300 | goto unlock; |
f2fcfcd6 | 2301 | } |
1da177e4 | 2302 | |
5dee9e7c | 2303 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 2304 | chan->num_conf_rsp++; |
5dee9e7c | 2305 | |
5dee9e7c | 2306 | /* Reset config buffer. */ |
73ffa904 | 2307 | chan->conf_len = 0; |
5dee9e7c | 2308 | |
876d9484 MH |
2309 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) |
2310 | goto unlock; | |
2311 | ||
1da177e4 | 2312 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { |
8c462b60 | 2313 | set_default_fcs(l2cap_pi(sk)); |
fcc203c3 | 2314 | |
1da177e4 | 2315 | sk->sk_state = BT_CONNECTED; |
e90bac06 | 2316 | |
42e5c802 GP |
2317 | chan->next_tx_seq = 0; |
2318 | chan->expected_tx_seq = 0; | |
58d35f87 | 2319 | skb_queue_head_init(&chan->tx_q); |
0565c1c2 | 2320 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
525cd185 | 2321 | l2cap_ertm_init(chan); |
0565c1c2 | 2322 | |
1da177e4 | 2323 | l2cap_chan_ready(sk); |
876d9484 MH |
2324 | goto unlock; |
2325 | } | |
2326 | ||
2327 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { | |
79d554a6 | 2328 | u8 buf[64]; |
ab3e5715 | 2329 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; |
1da177e4 | 2330 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2331 | l2cap_build_conf_req(chan, buf), buf); |
2332 | chan->num_conf_req++; | |
1da177e4 LT |
2333 | } |
2334 | ||
2335 | unlock: | |
2336 | bh_unlock_sock(sk); | |
2337 | return 0; | |
2338 | } | |
2339 | ||
2340 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2341 | { | |
2342 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
2343 | u16 scid, flags, result; | |
48454079 | 2344 | struct l2cap_chan *chan; |
1da177e4 | 2345 | struct sock *sk; |
7b1c0049 | 2346 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
2347 | |
2348 | scid = __le16_to_cpu(rsp->scid); | |
2349 | flags = __le16_to_cpu(rsp->flags); | |
2350 | result = __le16_to_cpu(rsp->result); | |
2351 | ||
af05b30b GP |
2352 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
2353 | scid, flags, result); | |
1da177e4 | 2354 | |
baa7e1fa | 2355 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2356 | if (!chan) |
1da177e4 LT |
2357 | return 0; |
2358 | ||
48454079 GP |
2359 | sk = chan->sk; |
2360 | ||
1da177e4 LT |
2361 | switch (result) { |
2362 | case L2CAP_CONF_SUCCESS: | |
7b1c0049 | 2363 | l2cap_conf_rfc_get(sk, rsp->data, len); |
1da177e4 LT |
2364 | break; |
2365 | ||
2366 | case L2CAP_CONF_UNACCEPT: | |
73ffa904 | 2367 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
2368 | char req[64]; |
2369 | ||
c2c77ec8 | 2370 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 2371 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
2372 | goto done; |
2373 | } | |
2374 | ||
f2fcfcd6 GP |
2375 | /* throw out any old stored conf requests */ |
2376 | result = L2CAP_CONF_SUCCESS; | |
2377 | len = l2cap_parse_conf_rsp(sk, rsp->data, | |
2378 | len, req, &result); | |
2379 | if (len < 0) { | |
e92c8e70 | 2380 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
2381 | goto done; |
2382 | } | |
2383 | ||
2384 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2385 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 2386 | chan->num_conf_req++; |
f2fcfcd6 GP |
2387 | if (result != L2CAP_CONF_SUCCESS) |
2388 | goto done; | |
2389 | break; | |
1da177e4 LT |
2390 | } |
2391 | ||
8e87d142 | 2392 | default: |
b1235d79 | 2393 | sk->sk_err = ECONNRESET; |
1da177e4 | 2394 | l2cap_sock_set_timer(sk, HZ * 5); |
e92c8e70 | 2395 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
2396 | goto done; |
2397 | } | |
2398 | ||
2399 | if (flags & 0x01) | |
2400 | goto done; | |
2401 | ||
1da177e4 LT |
2402 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; |
2403 | ||
2404 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { | |
8c462b60 | 2405 | set_default_fcs(l2cap_pi(sk)); |
fcc203c3 | 2406 | |
1da177e4 | 2407 | sk->sk_state = BT_CONNECTED; |
42e5c802 GP |
2408 | chan->next_tx_seq = 0; |
2409 | chan->expected_tx_seq = 0; | |
58d35f87 | 2410 | skb_queue_head_init(&chan->tx_q); |
0565c1c2 | 2411 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
525cd185 | 2412 | l2cap_ertm_init(chan); |
0565c1c2 | 2413 | |
1da177e4 LT |
2414 | l2cap_chan_ready(sk); |
2415 | } | |
2416 | ||
2417 | done: | |
2418 | bh_unlock_sock(sk); | |
2419 | return 0; | |
2420 | } | |
2421 | ||
2422 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2423 | { | |
2424 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
2425 | struct l2cap_disconn_rsp rsp; | |
2426 | u16 dcid, scid; | |
48454079 | 2427 | struct l2cap_chan *chan; |
1da177e4 LT |
2428 | struct sock *sk; |
2429 | ||
2430 | scid = __le16_to_cpu(req->scid); | |
2431 | dcid = __le16_to_cpu(req->dcid); | |
2432 | ||
2433 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
2434 | ||
baa7e1fa | 2435 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2436 | if (!chan) |
1da177e4 LT |
2437 | return 0; |
2438 | ||
48454079 GP |
2439 | sk = chan->sk; |
2440 | ||
aca3192c YH |
2441 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); |
2442 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1da177e4 LT |
2443 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
2444 | ||
2445 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2446 | ||
a49184c2 AE |
2447 | /* don't delete l2cap channel if sk is owned by user */ |
2448 | if (sock_owned_by_user(sk)) { | |
2449 | sk->sk_state = BT_DISCONN; | |
2450 | l2cap_sock_clear_timer(sk); | |
2451 | l2cap_sock_set_timer(sk, HZ / 5); | |
2452 | bh_unlock_sock(sk); | |
2453 | return 0; | |
2454 | } | |
2455 | ||
48454079 | 2456 | l2cap_chan_del(chan, ECONNRESET); |
1da177e4 LT |
2457 | bh_unlock_sock(sk); |
2458 | ||
2459 | l2cap_sock_kill(sk); | |
2460 | return 0; | |
2461 | } | |
2462 | ||
2463 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2464 | { | |
2465 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
2466 | u16 dcid, scid; | |
48454079 | 2467 | struct l2cap_chan *chan; |
1da177e4 LT |
2468 | struct sock *sk; |
2469 | ||
2470 | scid = __le16_to_cpu(rsp->scid); | |
2471 | dcid = __le16_to_cpu(rsp->dcid); | |
2472 | ||
2473 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
2474 | ||
baa7e1fa | 2475 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2476 | if (!chan) |
1da177e4 LT |
2477 | return 0; |
2478 | ||
48454079 GP |
2479 | sk = chan->sk; |
2480 | ||
a49184c2 AE |
2481 | /* don't delete l2cap channel if sk is owned by user */ |
2482 | if (sock_owned_by_user(sk)) { | |
2483 | sk->sk_state = BT_DISCONN; | |
2484 | l2cap_sock_clear_timer(sk); | |
2485 | l2cap_sock_set_timer(sk, HZ / 5); | |
2486 | bh_unlock_sock(sk); | |
2487 | return 0; | |
2488 | } | |
2489 | ||
48454079 | 2490 | l2cap_chan_del(chan, 0); |
1da177e4 LT |
2491 | bh_unlock_sock(sk); |
2492 | ||
2493 | l2cap_sock_kill(sk); | |
2494 | return 0; | |
2495 | } | |
2496 | ||
2497 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2498 | { | |
2499 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
2500 | u16 type; |
2501 | ||
2502 | type = __le16_to_cpu(req->type); | |
2503 | ||
2504 | BT_DBG("type 0x%4.4x", type); | |
2505 | ||
f0709e03 MH |
2506 | if (type == L2CAP_IT_FEAT_MASK) { |
2507 | u8 buf[8]; | |
44dd46de | 2508 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
2509 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
2510 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2511 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 2512 | if (!disable_ertm) |
fcc203c3 GP |
2513 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2514 | | L2CAP_FEAT_FCS; | |
1b7bf4ed | 2515 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
2516 | l2cap_send_cmd(conn, cmd->ident, |
2517 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
2518 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
2519 | u8 buf[12]; | |
2520 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
2521 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2522 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
2523 | memcpy(buf + 4, l2cap_fixed_chan, 8); | |
2524 | l2cap_send_cmd(conn, cmd->ident, | |
2525 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
2526 | } else { |
2527 | struct l2cap_info_rsp rsp; | |
2528 | rsp.type = cpu_to_le16(type); | |
2529 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
2530 | l2cap_send_cmd(conn, cmd->ident, | |
2531 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
2532 | } | |
1da177e4 LT |
2533 | |
2534 | return 0; | |
2535 | } | |
2536 | ||
2537 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2538 | { | |
2539 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
2540 | u16 type, result; | |
2541 | ||
2542 | type = __le16_to_cpu(rsp->type); | |
2543 | result = __le16_to_cpu(rsp->result); | |
2544 | ||
2545 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
2546 | ||
e90165be AE |
2547 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
2548 | if (cmd->ident != conn->info_ident || | |
2549 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
2550 | return 0; | |
2551 | ||
4e8402a3 MH |
2552 | del_timer(&conn->info_timer); |
2553 | ||
adb08ede VT |
2554 | if (result != L2CAP_IR_SUCCESS) { |
2555 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2556 | conn->info_ident = 0; | |
2557 | ||
2558 | l2cap_conn_start(conn); | |
2559 | ||
2560 | return 0; | |
2561 | } | |
2562 | ||
984947dc | 2563 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 2564 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 2565 | |
47ec1dcd | 2566 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
2567 | struct l2cap_info_req req; |
2568 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2569 | ||
2570 | conn->info_ident = l2cap_get_ident(conn); | |
2571 | ||
2572 | l2cap_send_cmd(conn, conn->info_ident, | |
2573 | L2CAP_INFO_REQ, sizeof(req), &req); | |
2574 | } else { | |
2575 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2576 | conn->info_ident = 0; | |
2577 | ||
2578 | l2cap_conn_start(conn); | |
2579 | } | |
2580 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 2581 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 2582 | conn->info_ident = 0; |
984947dc MH |
2583 | |
2584 | l2cap_conn_start(conn); | |
2585 | } | |
4e8402a3 | 2586 | |
1da177e4 LT |
2587 | return 0; |
2588 | } | |
2589 | ||
e2174ca4 | 2590 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
2591 | u16 to_multiplier) |
2592 | { | |
2593 | u16 max_latency; | |
2594 | ||
2595 | if (min > max || min < 6 || max > 3200) | |
2596 | return -EINVAL; | |
2597 | ||
2598 | if (to_multiplier < 10 || to_multiplier > 3200) | |
2599 | return -EINVAL; | |
2600 | ||
2601 | if (max >= to_multiplier * 8) | |
2602 | return -EINVAL; | |
2603 | ||
2604 | max_latency = (to_multiplier * 8 / max) - 1; | |
2605 | if (latency > 499 || latency > max_latency) | |
2606 | return -EINVAL; | |
2607 | ||
2608 | return 0; | |
2609 | } | |
2610 | ||
2611 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
2612 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
2613 | { | |
2614 | struct hci_conn *hcon = conn->hcon; | |
2615 | struct l2cap_conn_param_update_req *req; | |
2616 | struct l2cap_conn_param_update_rsp rsp; | |
2617 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 2618 | int err; |
de73115a CT |
2619 | |
2620 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
2621 | return -EINVAL; | |
2622 | ||
2623 | cmd_len = __le16_to_cpu(cmd->len); | |
2624 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
2625 | return -EPROTO; | |
2626 | ||
2627 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
2628 | min = __le16_to_cpu(req->min); |
2629 | max = __le16_to_cpu(req->max); | |
de73115a CT |
2630 | latency = __le16_to_cpu(req->latency); |
2631 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
2632 | ||
2633 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2634 | min, max, latency, to_multiplier); | |
2635 | ||
2636 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
2637 | |
2638 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
2639 | if (err) | |
de73115a CT |
2640 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
2641 | else | |
2642 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); | |
2643 | ||
2644 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2645 | sizeof(rsp), &rsp); | |
2646 | ||
2ce603eb CT |
2647 | if (!err) |
2648 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
2649 | ||
de73115a CT |
2650 | return 0; |
2651 | } | |
2652 | ||
3300d9a9 CT |
2653 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2654 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
2655 | { | |
2656 | int err = 0; | |
2657 | ||
2658 | switch (cmd->code) { | |
2659 | case L2CAP_COMMAND_REJ: | |
2660 | l2cap_command_rej(conn, cmd, data); | |
2661 | break; | |
2662 | ||
2663 | case L2CAP_CONN_REQ: | |
2664 | err = l2cap_connect_req(conn, cmd, data); | |
2665 | break; | |
2666 | ||
2667 | case L2CAP_CONN_RSP: | |
2668 | err = l2cap_connect_rsp(conn, cmd, data); | |
2669 | break; | |
2670 | ||
2671 | case L2CAP_CONF_REQ: | |
2672 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
2673 | break; | |
2674 | ||
2675 | case L2CAP_CONF_RSP: | |
2676 | err = l2cap_config_rsp(conn, cmd, data); | |
2677 | break; | |
2678 | ||
2679 | case L2CAP_DISCONN_REQ: | |
2680 | err = l2cap_disconnect_req(conn, cmd, data); | |
2681 | break; | |
2682 | ||
2683 | case L2CAP_DISCONN_RSP: | |
2684 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
2685 | break; | |
2686 | ||
2687 | case L2CAP_ECHO_REQ: | |
2688 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
2689 | break; | |
2690 | ||
2691 | case L2CAP_ECHO_RSP: | |
2692 | break; | |
2693 | ||
2694 | case L2CAP_INFO_REQ: | |
2695 | err = l2cap_information_req(conn, cmd, data); | |
2696 | break; | |
2697 | ||
2698 | case L2CAP_INFO_RSP: | |
2699 | err = l2cap_information_rsp(conn, cmd, data); | |
2700 | break; | |
2701 | ||
2702 | default: | |
2703 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
2704 | err = -EINVAL; | |
2705 | break; | |
2706 | } | |
2707 | ||
2708 | return err; | |
2709 | } | |
2710 | ||
2711 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
2712 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
2713 | { | |
2714 | switch (cmd->code) { | |
2715 | case L2CAP_COMMAND_REJ: | |
2716 | return 0; | |
2717 | ||
2718 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 2719 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
2720 | |
2721 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
2722 | return 0; | |
2723 | ||
2724 | default: | |
2725 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
2726 | return -EINVAL; | |
2727 | } | |
2728 | } | |
2729 | ||
2730 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
2731 | struct sk_buff *skb) | |
1da177e4 LT |
2732 | { |
2733 | u8 *data = skb->data; | |
2734 | int len = skb->len; | |
2735 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 2736 | int err; |
1da177e4 LT |
2737 | |
2738 | l2cap_raw_recv(conn, skb); | |
2739 | ||
2740 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 2741 | u16 cmd_len; |
1da177e4 LT |
2742 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
2743 | data += L2CAP_CMD_HDR_SIZE; | |
2744 | len -= L2CAP_CMD_HDR_SIZE; | |
2745 | ||
88219a0f | 2746 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 2747 | |
88219a0f | 2748 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 2749 | |
88219a0f | 2750 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
2751 | BT_DBG("corrupted command"); |
2752 | break; | |
2753 | } | |
2754 | ||
3300d9a9 CT |
2755 | if (conn->hcon->type == LE_LINK) |
2756 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
2757 | else | |
2758 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
2759 | |
2760 | if (err) { | |
2761 | struct l2cap_cmd_rej rej; | |
2c6d1a2e GP |
2762 | |
2763 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
2764 | |
2765 | /* FIXME: Map err to a valid reason */ | |
aca3192c | 2766 | rej.reason = cpu_to_le16(0); |
1da177e4 LT |
2767 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
2768 | } | |
2769 | ||
88219a0f AV |
2770 | data += cmd_len; |
2771 | len -= cmd_len; | |
1da177e4 LT |
2772 | } |
2773 | ||
2774 | kfree_skb(skb); | |
2775 | } | |
2776 | ||
fcc203c3 GP |
2777 | static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb) |
2778 | { | |
2779 | u16 our_fcs, rcv_fcs; | |
2780 | int hdr_size = L2CAP_HDR_SIZE + 2; | |
2781 | ||
2782 | if (pi->fcs == L2CAP_FCS_CRC16) { | |
2783 | skb_trim(skb, skb->len - 2); | |
2784 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); | |
2785 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
2786 | ||
2787 | if (our_fcs != rcv_fcs) | |
7a560e5c | 2788 | return -EBADMSG; |
fcc203c3 GP |
2789 | } |
2790 | return 0; | |
2791 | } | |
2792 | ||
525cd185 | 2793 | static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 2794 | { |
d5392c8f GP |
2795 | u16 control = 0; |
2796 | ||
6a026610 | 2797 | chan->frames_sent = 0; |
d5392c8f | 2798 | |
42e5c802 | 2799 | control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
d5392c8f | 2800 | |
525cd185 | 2801 | if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
64988868 | 2802 | control |= L2CAP_SUPER_RCV_NOT_READY; |
525cd185 GP |
2803 | l2cap_send_sframe(chan, control); |
2804 | chan->conn_state |= L2CAP_CONN_RNR_SENT; | |
d5392c8f GP |
2805 | } |
2806 | ||
525cd185 GP |
2807 | if (chan->conn_state & L2CAP_CONN_REMOTE_BUSY) |
2808 | l2cap_retransmit_frames(chan); | |
d5392c8f | 2809 | |
525cd185 | 2810 | l2cap_ertm_send(chan); |
d5392c8f | 2811 | |
525cd185 | 2812 | if (!(chan->conn_state & L2CAP_CONN_LOCAL_BUSY) && |
6a026610 | 2813 | chan->frames_sent == 0) { |
d5392c8f | 2814 | control |= L2CAP_SUPER_RCV_READY; |
525cd185 | 2815 | l2cap_send_sframe(chan, control); |
d5392c8f GP |
2816 | } |
2817 | } | |
2818 | ||
42e5c802 | 2819 | static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u8 tx_seq, u8 sar) |
8f17154f GP |
2820 | { |
2821 | struct sk_buff *next_skb; | |
bfbacc11 | 2822 | int tx_seq_offset, next_tx_seq_offset; |
8f17154f GP |
2823 | |
2824 | bt_cb(skb)->tx_seq = tx_seq; | |
2825 | bt_cb(skb)->sar = sar; | |
2826 | ||
f1c6775b | 2827 | next_skb = skb_peek(&chan->srej_q); |
8f17154f | 2828 | if (!next_skb) { |
f1c6775b | 2829 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d | 2830 | return 0; |
8f17154f GP |
2831 | } |
2832 | ||
42e5c802 | 2833 | tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; |
bfbacc11 JPRV |
2834 | if (tx_seq_offset < 0) |
2835 | tx_seq_offset += 64; | |
2836 | ||
8f17154f | 2837 | do { |
9b53350d JPRV |
2838 | if (bt_cb(next_skb)->tx_seq == tx_seq) |
2839 | return -EINVAL; | |
2840 | ||
bfbacc11 | 2841 | next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - |
42e5c802 | 2842 | chan->buffer_seq) % 64; |
bfbacc11 JPRV |
2843 | if (next_tx_seq_offset < 0) |
2844 | next_tx_seq_offset += 64; | |
2845 | ||
2846 | if (next_tx_seq_offset > tx_seq_offset) { | |
f1c6775b | 2847 | __skb_queue_before(&chan->srej_q, next_skb, skb); |
9b53350d | 2848 | return 0; |
8f17154f GP |
2849 | } |
2850 | ||
f1c6775b | 2851 | if (skb_queue_is_last(&chan->srej_q, next_skb)) |
8f17154f GP |
2852 | break; |
2853 | ||
f1c6775b | 2854 | } while ((next_skb = skb_queue_next(&chan->srej_q, next_skb))); |
8f17154f | 2855 | |
f1c6775b | 2856 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d JPRV |
2857 | |
2858 | return 0; | |
8f17154f GP |
2859 | } |
2860 | ||
525cd185 | 2861 | static int l2cap_ertm_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) |
18778a63 | 2862 | { |
525cd185 | 2863 | struct l2cap_pinfo *pi = l2cap_pi(chan->sk); |
18778a63 | 2864 | struct sk_buff *_skb; |
1890d36b | 2865 | int err; |
18778a63 GP |
2866 | |
2867 | switch (control & L2CAP_CTRL_SAR) { | |
2868 | case L2CAP_SDU_UNSEGMENTED: | |
525cd185 | 2869 | if (chan->conn_state & L2CAP_CONN_SAR_SDU) |
18778a63 GP |
2870 | goto drop; |
2871 | ||
525cd185 | 2872 | err = sock_queue_rcv_skb(chan->sk, skb); |
18778a63 GP |
2873 | if (!err) |
2874 | return err; | |
2875 | ||
2876 | break; | |
2877 | ||
2878 | case L2CAP_SDU_START: | |
525cd185 | 2879 | if (chan->conn_state & L2CAP_CONN_SAR_SDU) |
18778a63 GP |
2880 | goto drop; |
2881 | ||
6f61fd47 | 2882 | chan->sdu_len = get_unaligned_le16(skb->data); |
18778a63 | 2883 | |
6f61fd47 | 2884 | if (chan->sdu_len > pi->imtu) |
18778a63 GP |
2885 | goto disconnect; |
2886 | ||
6f61fd47 GP |
2887 | chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC); |
2888 | if (!chan->sdu) | |
1890d36b GP |
2889 | return -ENOMEM; |
2890 | ||
2891 | /* pull sdu_len bytes only after alloc, because of Local Busy | |
2892 | * condition we have to be sure that this will be executed | |
2893 | * only once, i.e., when alloc does not fail */ | |
2894 | skb_pull(skb, 2); | |
18778a63 | 2895 | |
6f61fd47 | 2896 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
18778a63 | 2897 | |
525cd185 | 2898 | chan->conn_state |= L2CAP_CONN_SAR_SDU; |
6f61fd47 | 2899 | chan->partial_sdu_len = skb->len; |
18778a63 GP |
2900 | break; |
2901 | ||
2902 | case L2CAP_SDU_CONTINUE: | |
525cd185 | 2903 | if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) |
18778a63 GP |
2904 | goto disconnect; |
2905 | ||
6f61fd47 | 2906 | if (!chan->sdu) |
18778a63 GP |
2907 | goto disconnect; |
2908 | ||
6f61fd47 GP |
2909 | chan->partial_sdu_len += skb->len; |
2910 | if (chan->partial_sdu_len > chan->sdu_len) | |
18778a63 GP |
2911 | goto drop; |
2912 | ||
6f61fd47 | 2913 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
4178ba46 | 2914 | |
18778a63 GP |
2915 | break; |
2916 | ||
2917 | case L2CAP_SDU_END: | |
525cd185 | 2918 | if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) |
18778a63 GP |
2919 | goto disconnect; |
2920 | ||
6f61fd47 | 2921 | if (!chan->sdu) |
18778a63 GP |
2922 | goto disconnect; |
2923 | ||
525cd185 | 2924 | if (!(chan->conn_state & L2CAP_CONN_SAR_RETRY)) { |
6f61fd47 | 2925 | chan->partial_sdu_len += skb->len; |
18778a63 | 2926 | |
6f61fd47 | 2927 | if (chan->partial_sdu_len > pi->imtu) |
1890d36b | 2928 | goto drop; |
18778a63 | 2929 | |
6f61fd47 | 2930 | if (chan->partial_sdu_len != chan->sdu_len) |
1890d36b | 2931 | goto drop; |
4178ba46 | 2932 | |
6f61fd47 | 2933 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
1890d36b | 2934 | } |
18778a63 | 2935 | |
6f61fd47 | 2936 | _skb = skb_clone(chan->sdu, GFP_ATOMIC); |
1890d36b | 2937 | if (!_skb) { |
525cd185 | 2938 | chan->conn_state |= L2CAP_CONN_SAR_RETRY; |
1890d36b GP |
2939 | return -ENOMEM; |
2940 | } | |
2941 | ||
525cd185 | 2942 | err = sock_queue_rcv_skb(chan->sk, _skb); |
1890d36b | 2943 | if (err < 0) { |
18778a63 | 2944 | kfree_skb(_skb); |
525cd185 | 2945 | chan->conn_state |= L2CAP_CONN_SAR_RETRY; |
1890d36b GP |
2946 | return err; |
2947 | } | |
2948 | ||
525cd185 GP |
2949 | chan->conn_state &= ~L2CAP_CONN_SAR_RETRY; |
2950 | chan->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
18778a63 | 2951 | |
6f61fd47 | 2952 | kfree_skb(chan->sdu); |
18778a63 GP |
2953 | break; |
2954 | } | |
2955 | ||
2956 | kfree_skb(skb); | |
1890d36b | 2957 | return 0; |
18778a63 GP |
2958 | |
2959 | drop: | |
6f61fd47 GP |
2960 | kfree_skb(chan->sdu); |
2961 | chan->sdu = NULL; | |
18778a63 GP |
2962 | |
2963 | disconnect: | |
e92c8e70 | 2964 | l2cap_send_disconn_req(pi->conn, chan, ECONNRESET); |
18778a63 GP |
2965 | kfree_skb(skb); |
2966 | return 0; | |
2967 | } | |
2968 | ||
525cd185 | 2969 | static int l2cap_try_push_rx_skb(struct l2cap_chan *chan) |
712132eb | 2970 | { |
712132eb GP |
2971 | struct sk_buff *skb; |
2972 | u16 control; | |
2973 | int err; | |
2974 | ||
f1c6775b | 2975 | while ((skb = skb_dequeue(&chan->busy_q))) { |
712132eb | 2976 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
525cd185 | 2977 | err = l2cap_ertm_reassembly_sdu(chan, skb, control); |
712132eb | 2978 | if (err < 0) { |
f1c6775b | 2979 | skb_queue_head(&chan->busy_q, skb); |
712132eb GP |
2980 | return -EBUSY; |
2981 | } | |
2982 | ||
42e5c802 | 2983 | chan->buffer_seq = (chan->buffer_seq + 1) % 64; |
712132eb GP |
2984 | } |
2985 | ||
525cd185 | 2986 | if (!(chan->conn_state & L2CAP_CONN_RNR_SENT)) |
712132eb GP |
2987 | goto done; |
2988 | ||
42e5c802 | 2989 | control = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
712132eb | 2990 | control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; |
525cd185 | 2991 | l2cap_send_sframe(chan, control); |
6a026610 | 2992 | chan->retry_count = 1; |
712132eb | 2993 | |
e92c8e70 | 2994 | del_timer(&chan->retrans_timer); |
712132eb GP |
2995 | __mod_monitor_timer(); |
2996 | ||
525cd185 | 2997 | chan->conn_state |= L2CAP_CONN_WAIT_F; |
712132eb GP |
2998 | |
2999 | done: | |
525cd185 GP |
3000 | chan->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; |
3001 | chan->conn_state &= ~L2CAP_CONN_RNR_SENT; | |
712132eb | 3002 | |
49208c9c | 3003 | BT_DBG("chan %p, Exit local busy", chan); |
712132eb GP |
3004 | |
3005 | return 0; | |
3006 | } | |
3007 | ||
1890d36b GP |
3008 | static void l2cap_busy_work(struct work_struct *work) |
3009 | { | |
3010 | DECLARE_WAITQUEUE(wait, current); | |
311bb895 GP |
3011 | struct l2cap_chan *chan = |
3012 | container_of(work, struct l2cap_chan, busy_work); | |
3013 | struct sock *sk = chan->sk; | |
1890d36b GP |
3014 | int n_tries = 0, timeo = HZ/5, err; |
3015 | struct sk_buff *skb; | |
1890d36b GP |
3016 | |
3017 | lock_sock(sk); | |
3018 | ||
2b0b05dd | 3019 | add_wait_queue(sk_sleep(sk), &wait); |
311bb895 | 3020 | while ((skb = skb_peek(&chan->busy_q))) { |
1890d36b GP |
3021 | set_current_state(TASK_INTERRUPTIBLE); |
3022 | ||
3023 | if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { | |
3024 | err = -EBUSY; | |
311bb895 | 3025 | l2cap_send_disconn_req(l2cap_pi(sk)->conn, chan, EBUSY); |
712132eb | 3026 | break; |
1890d36b GP |
3027 | } |
3028 | ||
3029 | if (!timeo) | |
3030 | timeo = HZ/5; | |
3031 | ||
3032 | if (signal_pending(current)) { | |
3033 | err = sock_intr_errno(timeo); | |
712132eb | 3034 | break; |
1890d36b GP |
3035 | } |
3036 | ||
3037 | release_sock(sk); | |
3038 | timeo = schedule_timeout(timeo); | |
3039 | lock_sock(sk); | |
3040 | ||
3041 | err = sock_error(sk); | |
3042 | if (err) | |
712132eb | 3043 | break; |
1890d36b | 3044 | |
311bb895 | 3045 | if (l2cap_try_push_rx_skb(chan) == 0) |
1890d36b GP |
3046 | break; |
3047 | } | |
3048 | ||
1890d36b | 3049 | set_current_state(TASK_RUNNING); |
2b0b05dd | 3050 | remove_wait_queue(sk_sleep(sk), &wait); |
1890d36b GP |
3051 | |
3052 | release_sock(sk); | |
3053 | } | |
3054 | ||
525cd185 | 3055 | static int l2cap_push_rx_skb(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) |
1890d36b | 3056 | { |
1890d36b GP |
3057 | int sctrl, err; |
3058 | ||
525cd185 | 3059 | if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
1890d36b | 3060 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; |
f1c6775b | 3061 | __skb_queue_tail(&chan->busy_q, skb); |
525cd185 | 3062 | return l2cap_try_push_rx_skb(chan); |
712132eb GP |
3063 | |
3064 | ||
1890d36b GP |
3065 | } |
3066 | ||
525cd185 | 3067 | err = l2cap_ertm_reassembly_sdu(chan, skb, control); |
1890d36b | 3068 | if (err >= 0) { |
42e5c802 | 3069 | chan->buffer_seq = (chan->buffer_seq + 1) % 64; |
1890d36b GP |
3070 | return err; |
3071 | } | |
3072 | ||
3073 | /* Busy Condition */ | |
311bb895 | 3074 | BT_DBG("chan %p, Enter local busy", chan); |
0e98958d | 3075 | |
525cd185 | 3076 | chan->conn_state |= L2CAP_CONN_LOCAL_BUSY; |
1890d36b | 3077 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; |
f1c6775b | 3078 | __skb_queue_tail(&chan->busy_q, skb); |
1890d36b | 3079 | |
42e5c802 | 3080 | sctrl = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
1890d36b | 3081 | sctrl |= L2CAP_SUPER_RCV_NOT_READY; |
525cd185 | 3082 | l2cap_send_sframe(chan, sctrl); |
1890d36b | 3083 | |
525cd185 | 3084 | chan->conn_state |= L2CAP_CONN_RNR_SENT; |
1890d36b | 3085 | |
e92c8e70 | 3086 | del_timer(&chan->ack_timer); |
7fe9b298 | 3087 | |
311bb895 | 3088 | queue_work(_busy_wq, &chan->busy_work); |
1890d36b GP |
3089 | |
3090 | return err; | |
3091 | } | |
3092 | ||
525cd185 | 3093 | static int l2cap_streaming_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) |
c74e560c | 3094 | { |
525cd185 | 3095 | struct l2cap_pinfo *pi = l2cap_pi(chan->sk); |
c74e560c GP |
3096 | struct sk_buff *_skb; |
3097 | int err = -EINVAL; | |
3098 | ||
18778a63 GP |
3099 | /* |
3100 | * TODO: We have to notify the userland if some data is lost with the | |
3101 | * Streaming Mode. | |
3102 | */ | |
3103 | ||
c74e560c GP |
3104 | switch (control & L2CAP_CTRL_SAR) { |
3105 | case L2CAP_SDU_UNSEGMENTED: | |
525cd185 | 3106 | if (chan->conn_state & L2CAP_CONN_SAR_SDU) { |
6f61fd47 | 3107 | kfree_skb(chan->sdu); |
c74e560c GP |
3108 | break; |
3109 | } | |
3110 | ||
525cd185 | 3111 | err = sock_queue_rcv_skb(chan->sk, skb); |
c74e560c GP |
3112 | if (!err) |
3113 | return 0; | |
3114 | ||
3115 | break; | |
3116 | ||
3117 | case L2CAP_SDU_START: | |
525cd185 | 3118 | if (chan->conn_state & L2CAP_CONN_SAR_SDU) { |
6f61fd47 | 3119 | kfree_skb(chan->sdu); |
c74e560c GP |
3120 | break; |
3121 | } | |
3122 | ||
6f61fd47 | 3123 | chan->sdu_len = get_unaligned_le16(skb->data); |
c74e560c GP |
3124 | skb_pull(skb, 2); |
3125 | ||
6f61fd47 | 3126 | if (chan->sdu_len > pi->imtu) { |
052897ca GP |
3127 | err = -EMSGSIZE; |
3128 | break; | |
3129 | } | |
3130 | ||
6f61fd47 GP |
3131 | chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC); |
3132 | if (!chan->sdu) { | |
c74e560c GP |
3133 | err = -ENOMEM; |
3134 | break; | |
3135 | } | |
3136 | ||
6f61fd47 | 3137 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
c74e560c | 3138 | |
525cd185 | 3139 | chan->conn_state |= L2CAP_CONN_SAR_SDU; |
6f61fd47 | 3140 | chan->partial_sdu_len = skb->len; |
c74e560c GP |
3141 | err = 0; |
3142 | break; | |
3143 | ||
3144 | case L2CAP_SDU_CONTINUE: | |
525cd185 | 3145 | if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) |
c74e560c GP |
3146 | break; |
3147 | ||
6f61fd47 | 3148 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
c74e560c | 3149 | |
6f61fd47 GP |
3150 | chan->partial_sdu_len += skb->len; |
3151 | if (chan->partial_sdu_len > chan->sdu_len) | |
3152 | kfree_skb(chan->sdu); | |
c74e560c GP |
3153 | else |
3154 | err = 0; | |
3155 | ||
3156 | break; | |
3157 | ||
3158 | case L2CAP_SDU_END: | |
525cd185 | 3159 | if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) |
c74e560c GP |
3160 | break; |
3161 | ||
6f61fd47 | 3162 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
c74e560c | 3163 | |
525cd185 | 3164 | chan->conn_state &= ~L2CAP_CONN_SAR_SDU; |
6f61fd47 | 3165 | chan->partial_sdu_len += skb->len; |
c74e560c | 3166 | |
6f61fd47 | 3167 | if (chan->partial_sdu_len > pi->imtu) |
36f2fd58 GP |
3168 | goto drop; |
3169 | ||
6f61fd47 GP |
3170 | if (chan->partial_sdu_len == chan->sdu_len) { |
3171 | _skb = skb_clone(chan->sdu, GFP_ATOMIC); | |
525cd185 | 3172 | err = sock_queue_rcv_skb(chan->sk, _skb); |
c74e560c GP |
3173 | if (err < 0) |
3174 | kfree_skb(_skb); | |
3175 | } | |
c74e560c GP |
3176 | err = 0; |
3177 | ||
36f2fd58 | 3178 | drop: |
6f61fd47 | 3179 | kfree_skb(chan->sdu); |
c74e560c GP |
3180 | break; |
3181 | } | |
3182 | ||
3183 | kfree_skb(skb); | |
3184 | return err; | |
3185 | } | |
3186 | ||
525cd185 | 3187 | static void l2cap_check_srej_gap(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f GP |
3188 | { |
3189 | struct sk_buff *skb; | |
afefdbc4 | 3190 | u16 control; |
8f17154f | 3191 | |
f1c6775b | 3192 | while ((skb = skb_peek(&chan->srej_q))) { |
8f17154f GP |
3193 | if (bt_cb(skb)->tx_seq != tx_seq) |
3194 | break; | |
3195 | ||
f1c6775b | 3196 | skb = skb_dequeue(&chan->srej_q); |
afefdbc4 | 3197 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
525cd185 | 3198 | l2cap_ertm_reassembly_sdu(chan, skb, control); |
42e5c802 GP |
3199 | chan->buffer_seq_srej = |
3200 | (chan->buffer_seq_srej + 1) % 64; | |
8ff50ec0 | 3201 | tx_seq = (tx_seq + 1) % 64; |
8f17154f GP |
3202 | } |
3203 | } | |
3204 | ||
525cd185 | 3205 | static void l2cap_resend_srejframe(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f | 3206 | { |
8f17154f GP |
3207 | struct srej_list *l, *tmp; |
3208 | u16 control; | |
3209 | ||
39d5a3ee | 3210 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
8f17154f GP |
3211 | if (l->tx_seq == tx_seq) { |
3212 | list_del(&l->list); | |
3213 | kfree(l); | |
3214 | return; | |
3215 | } | |
3216 | control = L2CAP_SUPER_SELECT_REJECT; | |
3217 | control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
525cd185 | 3218 | l2cap_send_sframe(chan, control); |
8f17154f | 3219 | list_del(&l->list); |
39d5a3ee | 3220 | list_add_tail(&l->list, &chan->srej_l); |
8f17154f GP |
3221 | } |
3222 | } | |
3223 | ||
525cd185 | 3224 | static void l2cap_send_srejframe(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f | 3225 | { |
8f17154f GP |
3226 | struct srej_list *new; |
3227 | u16 control; | |
3228 | ||
42e5c802 | 3229 | while (tx_seq != chan->expected_tx_seq) { |
8f17154f | 3230 | control = L2CAP_SUPER_SELECT_REJECT; |
42e5c802 | 3231 | control |= chan->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
525cd185 | 3232 | l2cap_send_sframe(chan, control); |
8f17154f GP |
3233 | |
3234 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
42e5c802 GP |
3235 | new->tx_seq = chan->expected_tx_seq; |
3236 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; | |
39d5a3ee | 3237 | list_add_tail(&new->list, &chan->srej_l); |
8f17154f | 3238 | } |
42e5c802 | 3239 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; |
8f17154f GP |
3240 | } |
3241 | ||
525cd185 | 3242 | static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) |
1c2acffb | 3243 | { |
49208c9c | 3244 | struct l2cap_pinfo *pi = l2cap_pi(chan->sk); |
1c2acffb | 3245 | u8 tx_seq = __get_txseq(rx_control); |
9f121a5a | 3246 | u8 req_seq = __get_reqseq(rx_control); |
8f17154f | 3247 | u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; |
f6337c77 | 3248 | int tx_seq_offset, expected_tx_seq_offset; |
803020c6 | 3249 | int num_to_ack = (pi->tx_win/6) + 1; |
1c2acffb GP |
3250 | int err = 0; |
3251 | ||
525cd185 GP |
3252 | BT_DBG("chan %p len %d tx_seq %d rx_control 0x%4.4x", chan, skb->len, |
3253 | tx_seq, rx_control); | |
1c2acffb | 3254 | |
9b16dc65 | 3255 | if (L2CAP_CTRL_FINAL & rx_control && |
525cd185 | 3256 | chan->conn_state & L2CAP_CONN_WAIT_F) { |
e92c8e70 | 3257 | del_timer(&chan->monitor_timer); |
6a026610 | 3258 | if (chan->unacked_frames > 0) |
1d8f5d16 | 3259 | __mod_retrans_timer(); |
525cd185 | 3260 | chan->conn_state &= ~L2CAP_CONN_WAIT_F; |
1d8f5d16 GP |
3261 | } |
3262 | ||
42e5c802 GP |
3263 | chan->expected_ack_seq = req_seq; |
3264 | l2cap_drop_acked_frames(chan); | |
9f121a5a | 3265 | |
42e5c802 | 3266 | if (tx_seq == chan->expected_tx_seq) |
8f17154f | 3267 | goto expected; |
1c2acffb | 3268 | |
42e5c802 | 3269 | tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; |
9b53350d JPRV |
3270 | if (tx_seq_offset < 0) |
3271 | tx_seq_offset += 64; | |
3272 | ||
3273 | /* invalid tx_seq */ | |
3274 | if (tx_seq_offset >= pi->tx_win) { | |
e92c8e70 | 3275 | l2cap_send_disconn_req(pi->conn, chan, ECONNRESET); |
9b53350d JPRV |
3276 | goto drop; |
3277 | } | |
3278 | ||
525cd185 | 3279 | if (chan->conn_state == L2CAP_CONN_LOCAL_BUSY) |
1890d36b GP |
3280 | goto drop; |
3281 | ||
525cd185 | 3282 | if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { |
8f17154f | 3283 | struct srej_list *first; |
30afb5b2 | 3284 | |
39d5a3ee | 3285 | first = list_first_entry(&chan->srej_l, |
8f17154f GP |
3286 | struct srej_list, list); |
3287 | if (tx_seq == first->tx_seq) { | |
42e5c802 | 3288 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
525cd185 | 3289 | l2cap_check_srej_gap(chan, tx_seq); |
8f17154f GP |
3290 | |
3291 | list_del(&first->list); | |
3292 | kfree(first); | |
3293 | ||
39d5a3ee | 3294 | if (list_empty(&chan->srej_l)) { |
42e5c802 | 3295 | chan->buffer_seq = chan->buffer_seq_srej; |
525cd185 GP |
3296 | chan->conn_state &= ~L2CAP_CONN_SREJ_SENT; |
3297 | l2cap_send_ack(chan); | |
49208c9c | 3298 | BT_DBG("chan %p, Exit SREJ_SENT", chan); |
8f17154f GP |
3299 | } |
3300 | } else { | |
3301 | struct srej_list *l; | |
9b53350d JPRV |
3302 | |
3303 | /* duplicated tx_seq */ | |
42e5c802 | 3304 | if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0) |
9b53350d | 3305 | goto drop; |
8f17154f | 3306 | |
39d5a3ee | 3307 | list_for_each_entry(l, &chan->srej_l, list) { |
8f17154f | 3308 | if (l->tx_seq == tx_seq) { |
525cd185 | 3309 | l2cap_resend_srejframe(chan, tx_seq); |
8f17154f GP |
3310 | return 0; |
3311 | } | |
3312 | } | |
525cd185 | 3313 | l2cap_send_srejframe(chan, tx_seq); |
30afb5b2 GP |
3314 | } |
3315 | } else { | |
9b53350d | 3316 | expected_tx_seq_offset = |
42e5c802 | 3317 | (chan->expected_tx_seq - chan->buffer_seq) % 64; |
9b53350d JPRV |
3318 | if (expected_tx_seq_offset < 0) |
3319 | expected_tx_seq_offset += 64; | |
3320 | ||
3321 | /* duplicated tx_seq */ | |
3322 | if (tx_seq_offset < expected_tx_seq_offset) | |
3323 | goto drop; | |
3324 | ||
525cd185 | 3325 | chan->conn_state |= L2CAP_CONN_SREJ_SENT; |
1c2acffb | 3326 | |
49208c9c | 3327 | BT_DBG("chan %p, Enter SREJ", chan); |
0e98958d | 3328 | |
39d5a3ee | 3329 | INIT_LIST_HEAD(&chan->srej_l); |
42e5c802 | 3330 | chan->buffer_seq_srej = chan->buffer_seq; |
8f17154f | 3331 | |
f1c6775b GP |
3332 | __skb_queue_head_init(&chan->srej_q); |
3333 | __skb_queue_head_init(&chan->busy_q); | |
42e5c802 | 3334 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
8f17154f | 3335 | |
525cd185 | 3336 | chan->conn_state |= L2CAP_CONN_SEND_PBIT; |
ef54fd93 | 3337 | |
525cd185 | 3338 | l2cap_send_srejframe(chan, tx_seq); |
7fe9b298 | 3339 | |
e92c8e70 | 3340 | del_timer(&chan->ack_timer); |
1c2acffb | 3341 | } |
30afb5b2 GP |
3342 | return 0; |
3343 | ||
8f17154f | 3344 | expected: |
42e5c802 | 3345 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; |
8f17154f | 3346 | |
525cd185 | 3347 | if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { |
3b1a9f3f GP |
3348 | bt_cb(skb)->tx_seq = tx_seq; |
3349 | bt_cb(skb)->sar = sar; | |
f1c6775b | 3350 | __skb_queue_tail(&chan->srej_q, skb); |
8f17154f GP |
3351 | return 0; |
3352 | } | |
3353 | ||
525cd185 | 3354 | err = l2cap_push_rx_skb(chan, skb, rx_control); |
2ece3684 GP |
3355 | if (err < 0) |
3356 | return 0; | |
3357 | ||
4ec10d97 | 3358 | if (rx_control & L2CAP_CTRL_FINAL) { |
525cd185 GP |
3359 | if (chan->conn_state & L2CAP_CONN_REJ_ACT) |
3360 | chan->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be | 3361 | else |
525cd185 | 3362 | l2cap_retransmit_frames(chan); |
4ec10d97 GP |
3363 | } |
3364 | ||
c1b4f43b GP |
3365 | __mod_ack_timer(); |
3366 | ||
6a026610 GP |
3367 | chan->num_acked = (chan->num_acked + 1) % num_to_ack; |
3368 | if (chan->num_acked == num_to_ack - 1) | |
525cd185 | 3369 | l2cap_send_ack(chan); |
9e917af1 | 3370 | |
8f17154f | 3371 | return 0; |
9b53350d JPRV |
3372 | |
3373 | drop: | |
3374 | kfree_skb(skb); | |
3375 | return 0; | |
1c2acffb GP |
3376 | } |
3377 | ||
525cd185 | 3378 | static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u16 rx_control) |
1c2acffb | 3379 | { |
49208c9c | 3380 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, __get_reqseq(rx_control), |
0e98958d GP |
3381 | rx_control); |
3382 | ||
42e5c802 GP |
3383 | chan->expected_ack_seq = __get_reqseq(rx_control); |
3384 | l2cap_drop_acked_frames(chan); | |
1c2acffb | 3385 | |
e072745f | 3386 | if (rx_control & L2CAP_CTRL_POLL) { |
525cd185 GP |
3387 | chan->conn_state |= L2CAP_CONN_SEND_FBIT; |
3388 | if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { | |
3389 | if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && | |
6a026610 | 3390 | (chan->unacked_frames > 0)) |
05fbd89d GP |
3391 | __mod_retrans_timer(); |
3392 | ||
525cd185 GP |
3393 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3394 | l2cap_send_srejtail(chan); | |
05fbd89d | 3395 | } else { |
525cd185 | 3396 | l2cap_send_i_or_rr_or_rnr(chan); |
05fbd89d | 3397 | } |
1d8f5d16 | 3398 | |
e072745f | 3399 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
525cd185 | 3400 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
4ec10d97 | 3401 | |
525cd185 GP |
3402 | if (chan->conn_state & L2CAP_CONN_REJ_ACT) |
3403 | chan->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be | 3404 | else |
525cd185 | 3405 | l2cap_retransmit_frames(chan); |
2246b2f1 | 3406 | |
e072745f | 3407 | } else { |
525cd185 | 3408 | if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && |
6a026610 | 3409 | (chan->unacked_frames > 0)) |
e072745f | 3410 | __mod_retrans_timer(); |
1c2acffb | 3411 | |
525cd185 GP |
3412 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3413 | if (chan->conn_state & L2CAP_CONN_SREJ_SENT) | |
3414 | l2cap_send_ack(chan); | |
894718a6 | 3415 | else |
525cd185 | 3416 | l2cap_ertm_send(chan); |
e072745f GP |
3417 | } |
3418 | } | |
2246b2f1 | 3419 | |
525cd185 | 3420 | static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3421 | { |
e072745f | 3422 | u8 tx_seq = __get_reqseq(rx_control); |
30afb5b2 | 3423 | |
525cd185 | 3424 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3425 | |
525cd185 | 3426 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
e072745f | 3427 | |
42e5c802 GP |
3428 | chan->expected_ack_seq = tx_seq; |
3429 | l2cap_drop_acked_frames(chan); | |
e072745f GP |
3430 | |
3431 | if (rx_control & L2CAP_CTRL_FINAL) { | |
525cd185 GP |
3432 | if (chan->conn_state & L2CAP_CONN_REJ_ACT) |
3433 | chan->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be | 3434 | else |
525cd185 | 3435 | l2cap_retransmit_frames(chan); |
e072745f | 3436 | } else { |
525cd185 | 3437 | l2cap_retransmit_frames(chan); |
30afb5b2 | 3438 | |
525cd185 GP |
3439 | if (chan->conn_state & L2CAP_CONN_WAIT_F) |
3440 | chan->conn_state |= L2CAP_CONN_REJ_ACT; | |
e072745f GP |
3441 | } |
3442 | } | |
525cd185 | 3443 | static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3444 | { |
e072745f | 3445 | u8 tx_seq = __get_reqseq(rx_control); |
30afb5b2 | 3446 | |
525cd185 | 3447 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3448 | |
525cd185 | 3449 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
2246b2f1 | 3450 | |
e072745f | 3451 | if (rx_control & L2CAP_CTRL_POLL) { |
42e5c802 GP |
3452 | chan->expected_ack_seq = tx_seq; |
3453 | l2cap_drop_acked_frames(chan); | |
3cb123d1 | 3454 | |
525cd185 GP |
3455 | chan->conn_state |= L2CAP_CONN_SEND_FBIT; |
3456 | l2cap_retransmit_one_frame(chan, tx_seq); | |
dfc909be | 3457 | |
525cd185 | 3458 | l2cap_ertm_send(chan); |
dfc909be | 3459 | |
525cd185 | 3460 | if (chan->conn_state & L2CAP_CONN_WAIT_F) { |
6a026610 | 3461 | chan->srej_save_reqseq = tx_seq; |
525cd185 | 3462 | chan->conn_state |= L2CAP_CONN_SREJ_ACT; |
ef54fd93 | 3463 | } |
e072745f | 3464 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
525cd185 | 3465 | if ((chan->conn_state & L2CAP_CONN_SREJ_ACT) && |
6a026610 | 3466 | chan->srej_save_reqseq == tx_seq) |
525cd185 | 3467 | chan->conn_state &= ~L2CAP_CONN_SREJ_ACT; |
e072745f | 3468 | else |
525cd185 | 3469 | l2cap_retransmit_one_frame(chan, tx_seq); |
e072745f | 3470 | } else { |
525cd185 GP |
3471 | l2cap_retransmit_one_frame(chan, tx_seq); |
3472 | if (chan->conn_state & L2CAP_CONN_WAIT_F) { | |
6a026610 | 3473 | chan->srej_save_reqseq = tx_seq; |
525cd185 | 3474 | chan->conn_state |= L2CAP_CONN_SREJ_ACT; |
ef54fd93 | 3475 | } |
e072745f GP |
3476 | } |
3477 | } | |
3478 | ||
525cd185 | 3479 | static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3480 | { |
e072745f GP |
3481 | u8 tx_seq = __get_reqseq(rx_control); |
3482 | ||
525cd185 | 3483 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3484 | |
525cd185 | 3485 | chan->conn_state |= L2CAP_CONN_REMOTE_BUSY; |
42e5c802 GP |
3486 | chan->expected_ack_seq = tx_seq; |
3487 | l2cap_drop_acked_frames(chan); | |
e072745f | 3488 | |
3cb123d1 | 3489 | if (rx_control & L2CAP_CTRL_POLL) |
525cd185 | 3490 | chan->conn_state |= L2CAP_CONN_SEND_FBIT; |
3cb123d1 | 3491 | |
525cd185 | 3492 | if (!(chan->conn_state & L2CAP_CONN_SREJ_SENT)) { |
e92c8e70 | 3493 | del_timer(&chan->retrans_timer); |
a2e12a2a | 3494 | if (rx_control & L2CAP_CTRL_POLL) |
525cd185 | 3495 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL); |
99b0d4b7 | 3496 | return; |
e072745f | 3497 | } |
99b0d4b7 GP |
3498 | |
3499 | if (rx_control & L2CAP_CTRL_POLL) | |
525cd185 | 3500 | l2cap_send_srejtail(chan); |
99b0d4b7 | 3501 | else |
525cd185 | 3502 | l2cap_send_sframe(chan, L2CAP_SUPER_RCV_READY); |
e072745f GP |
3503 | } |
3504 | ||
525cd185 | 3505 | static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) |
e072745f | 3506 | { |
525cd185 | 3507 | BT_DBG("chan %p rx_control 0x%4.4x len %d", chan, rx_control, skb->len); |
e072745f | 3508 | |
9b16dc65 | 3509 | if (L2CAP_CTRL_FINAL & rx_control && |
525cd185 | 3510 | chan->conn_state & L2CAP_CONN_WAIT_F) { |
e92c8e70 | 3511 | del_timer(&chan->monitor_timer); |
6a026610 | 3512 | if (chan->unacked_frames > 0) |
e072745f | 3513 | __mod_retrans_timer(); |
525cd185 | 3514 | chan->conn_state &= ~L2CAP_CONN_WAIT_F; |
e072745f GP |
3515 | } |
3516 | ||
3517 | switch (rx_control & L2CAP_CTRL_SUPERVISE) { | |
3518 | case L2CAP_SUPER_RCV_READY: | |
525cd185 | 3519 | l2cap_data_channel_rrframe(chan, rx_control); |
8f17154f GP |
3520 | break; |
3521 | ||
e072745f | 3522 | case L2CAP_SUPER_REJECT: |
525cd185 | 3523 | l2cap_data_channel_rejframe(chan, rx_control); |
e072745f | 3524 | break; |
2246b2f1 | 3525 | |
e072745f | 3526 | case L2CAP_SUPER_SELECT_REJECT: |
525cd185 | 3527 | l2cap_data_channel_srejframe(chan, rx_control); |
e072745f GP |
3528 | break; |
3529 | ||
3530 | case L2CAP_SUPER_RCV_NOT_READY: | |
525cd185 | 3531 | l2cap_data_channel_rnrframe(chan, rx_control); |
1c2acffb GP |
3532 | break; |
3533 | } | |
3534 | ||
faaebd19 | 3535 | kfree_skb(skb); |
1c2acffb GP |
3536 | return 0; |
3537 | } | |
3538 | ||
218bb9df GP |
3539 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) |
3540 | { | |
525cd185 | 3541 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
218bb9df GP |
3542 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
3543 | u16 control; | |
3544 | u8 req_seq; | |
3545 | int len, next_tx_seq_offset, req_seq_offset; | |
3546 | ||
3547 | control = get_unaligned_le16(skb->data); | |
3548 | skb_pull(skb, 2); | |
3549 | len = skb->len; | |
3550 | ||
3551 | /* | |
3552 | * We can just drop the corrupted I-frame here. | |
3553 | * Receiver will miss it and start proper recovery | |
3554 | * procedures and ask retransmission. | |
3555 | */ | |
3556 | if (l2cap_check_fcs(pi, skb)) | |
3557 | goto drop; | |
3558 | ||
3559 | if (__is_sar_start(control) && __is_iframe(control)) | |
3560 | len -= 2; | |
3561 | ||
3562 | if (pi->fcs == L2CAP_FCS_CRC16) | |
3563 | len -= 2; | |
3564 | ||
3565 | if (len > pi->mps) { | |
e92c8e70 | 3566 | l2cap_send_disconn_req(pi->conn, chan, ECONNRESET); |
218bb9df GP |
3567 | goto drop; |
3568 | } | |
3569 | ||
3570 | req_seq = __get_reqseq(control); | |
42e5c802 | 3571 | req_seq_offset = (req_seq - chan->expected_ack_seq) % 64; |
218bb9df GP |
3572 | if (req_seq_offset < 0) |
3573 | req_seq_offset += 64; | |
3574 | ||
3575 | next_tx_seq_offset = | |
42e5c802 | 3576 | (chan->next_tx_seq - chan->expected_ack_seq) % 64; |
218bb9df GP |
3577 | if (next_tx_seq_offset < 0) |
3578 | next_tx_seq_offset += 64; | |
3579 | ||
3580 | /* check for invalid req-seq */ | |
3581 | if (req_seq_offset > next_tx_seq_offset) { | |
e92c8e70 | 3582 | l2cap_send_disconn_req(pi->conn, chan, ECONNRESET); |
218bb9df GP |
3583 | goto drop; |
3584 | } | |
3585 | ||
3586 | if (__is_iframe(control)) { | |
3587 | if (len < 0) { | |
e92c8e70 | 3588 | l2cap_send_disconn_req(pi->conn, chan, ECONNRESET); |
218bb9df GP |
3589 | goto drop; |
3590 | } | |
3591 | ||
525cd185 | 3592 | l2cap_data_channel_iframe(chan, control, skb); |
218bb9df GP |
3593 | } else { |
3594 | if (len != 0) { | |
3595 | BT_ERR("%d", len); | |
e92c8e70 | 3596 | l2cap_send_disconn_req(pi->conn, chan, ECONNRESET); |
218bb9df GP |
3597 | goto drop; |
3598 | } | |
3599 | ||
525cd185 | 3600 | l2cap_data_channel_sframe(chan, control, skb); |
218bb9df GP |
3601 | } |
3602 | ||
3603 | return 0; | |
3604 | ||
3605 | drop: | |
3606 | kfree_skb(skb); | |
3607 | return 0; | |
3608 | } | |
3609 | ||
1da177e4 LT |
3610 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
3611 | { | |
48454079 | 3612 | struct l2cap_chan *chan; |
1da177e4 | 3613 | struct sock *sk; |
6840ed07 | 3614 | struct l2cap_pinfo *pi; |
51893f88 | 3615 | u16 control; |
218bb9df GP |
3616 | u8 tx_seq; |
3617 | int len; | |
1da177e4 | 3618 | |
baa7e1fa | 3619 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 3620 | if (!chan) { |
1da177e4 LT |
3621 | BT_DBG("unknown cid 0x%4.4x", cid); |
3622 | goto drop; | |
3623 | } | |
3624 | ||
48454079 | 3625 | sk = chan->sk; |
6840ed07 GP |
3626 | pi = l2cap_pi(sk); |
3627 | ||
49208c9c | 3628 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 LT |
3629 | |
3630 | if (sk->sk_state != BT_CONNECTED) | |
3631 | goto drop; | |
3632 | ||
6840ed07 | 3633 | switch (pi->mode) { |
1c2acffb GP |
3634 | case L2CAP_MODE_BASIC: |
3635 | /* If socket recv buffers overflows we drop data here | |
3636 | * which is *bad* because L2CAP has to be reliable. | |
3637 | * But we don't have any other choice. L2CAP doesn't | |
3638 | * provide flow control mechanism. */ | |
1da177e4 | 3639 | |
6840ed07 | 3640 | if (pi->imtu < skb->len) |
1c2acffb | 3641 | goto drop; |
1da177e4 | 3642 | |
1c2acffb GP |
3643 | if (!sock_queue_rcv_skb(sk, skb)) |
3644 | goto done; | |
3645 | break; | |
3646 | ||
3647 | case L2CAP_MODE_ERTM: | |
218bb9df GP |
3648 | if (!sock_owned_by_user(sk)) { |
3649 | l2cap_ertm_data_rcv(sk, skb); | |
277ffbe3 | 3650 | } else { |
218bb9df | 3651 | if (sk_add_backlog(sk, skb)) |
277ffbe3 | 3652 | goto drop; |
277ffbe3 | 3653 | } |
1c2acffb | 3654 | |
fcafde2e | 3655 | goto done; |
1c2acffb | 3656 | |
6840ed07 GP |
3657 | case L2CAP_MODE_STREAMING: |
3658 | control = get_unaligned_le16(skb->data); | |
3659 | skb_pull(skb, 2); | |
3660 | len = skb->len; | |
3661 | ||
26000089 GP |
3662 | if (l2cap_check_fcs(pi, skb)) |
3663 | goto drop; | |
3664 | ||
6840ed07 GP |
3665 | if (__is_sar_start(control)) |
3666 | len -= 2; | |
3667 | ||
fcc203c3 GP |
3668 | if (pi->fcs == L2CAP_FCS_CRC16) |
3669 | len -= 2; | |
3670 | ||
51893f88 | 3671 | if (len > pi->mps || len < 0 || __is_sframe(control)) |
6840ed07 GP |
3672 | goto drop; |
3673 | ||
3674 | tx_seq = __get_txseq(control); | |
3675 | ||
42e5c802 GP |
3676 | if (chan->expected_tx_seq == tx_seq) |
3677 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; | |
6840ed07 | 3678 | else |
42e5c802 | 3679 | chan->expected_tx_seq = (tx_seq + 1) % 64; |
6840ed07 | 3680 | |
525cd185 | 3681 | l2cap_streaming_reassembly_sdu(chan, skb, control); |
6840ed07 GP |
3682 | |
3683 | goto done; | |
3684 | ||
1c2acffb | 3685 | default: |
49208c9c | 3686 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, pi->mode); |
1c2acffb GP |
3687 | break; |
3688 | } | |
1da177e4 LT |
3689 | |
3690 | drop: | |
3691 | kfree_skb(skb); | |
3692 | ||
3693 | done: | |
0139418c MH |
3694 | if (sk) |
3695 | bh_unlock_sock(sk); | |
3696 | ||
1da177e4 LT |
3697 | return 0; |
3698 | } | |
3699 | ||
8e036fc3 | 3700 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 LT |
3701 | { |
3702 | struct sock *sk; | |
3703 | ||
3704 | sk = l2cap_get_sock_by_psm(0, psm, conn->src); | |
3705 | if (!sk) | |
3706 | goto drop; | |
3707 | ||
e0f0cb56 GP |
3708 | bh_lock_sock(sk); |
3709 | ||
1da177e4 LT |
3710 | BT_DBG("sk %p, len %d", sk, skb->len); |
3711 | ||
3712 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) | |
3713 | goto drop; | |
3714 | ||
3715 | if (l2cap_pi(sk)->imtu < skb->len) | |
3716 | goto drop; | |
3717 | ||
3718 | if (!sock_queue_rcv_skb(sk, skb)) | |
3719 | goto done; | |
3720 | ||
3721 | drop: | |
3722 | kfree_skb(skb); | |
3723 | ||
3724 | done: | |
af05b30b GP |
3725 | if (sk) |
3726 | bh_unlock_sock(sk); | |
1da177e4 LT |
3727 | return 0; |
3728 | } | |
3729 | ||
9f69bda6 GP |
3730 | static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb) |
3731 | { | |
3732 | struct sock *sk; | |
3733 | ||
3734 | sk = l2cap_get_sock_by_scid(0, cid, conn->src); | |
3735 | if (!sk) | |
3736 | goto drop; | |
3737 | ||
3738 | bh_lock_sock(sk); | |
3739 | ||
3740 | BT_DBG("sk %p, len %d", sk, skb->len); | |
3741 | ||
3742 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) | |
3743 | goto drop; | |
3744 | ||
3745 | if (l2cap_pi(sk)->imtu < skb->len) | |
3746 | goto drop; | |
3747 | ||
3748 | if (!sock_queue_rcv_skb(sk, skb)) | |
3749 | goto done; | |
3750 | ||
3751 | drop: | |
3752 | kfree_skb(skb); | |
3753 | ||
3754 | done: | |
3755 | if (sk) | |
3756 | bh_unlock_sock(sk); | |
3757 | return 0; | |
3758 | } | |
3759 | ||
1da177e4 LT |
3760 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
3761 | { | |
3762 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
3763 | u16 cid, len; |
3764 | __le16 psm; | |
1da177e4 LT |
3765 | |
3766 | skb_pull(skb, L2CAP_HDR_SIZE); | |
3767 | cid = __le16_to_cpu(lh->cid); | |
3768 | len = __le16_to_cpu(lh->len); | |
3769 | ||
1c2acffb GP |
3770 | if (len != skb->len) { |
3771 | kfree_skb(skb); | |
3772 | return; | |
3773 | } | |
3774 | ||
1da177e4 LT |
3775 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
3776 | ||
3777 | switch (cid) { | |
3300d9a9 | 3778 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 3779 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
3780 | l2cap_sig_channel(conn, skb); |
3781 | break; | |
3782 | ||
8db4dc46 | 3783 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 3784 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
3785 | skb_pull(skb, 2); |
3786 | l2cap_conless_channel(conn, psm, skb); | |
3787 | break; | |
3788 | ||
9f69bda6 GP |
3789 | case L2CAP_CID_LE_DATA: |
3790 | l2cap_att_channel(conn, cid, skb); | |
3791 | break; | |
3792 | ||
1da177e4 LT |
3793 | default: |
3794 | l2cap_data_channel(conn, cid, skb); | |
3795 | break; | |
3796 | } | |
3797 | } | |
3798 | ||
3799 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
3800 | ||
3801 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
3802 | { | |
3803 | int exact = 0, lm1 = 0, lm2 = 0; | |
3804 | register struct sock *sk; | |
3805 | struct hlist_node *node; | |
3806 | ||
3807 | if (type != ACL_LINK) | |
963cf687 | 3808 | return -EINVAL; |
1da177e4 LT |
3809 | |
3810 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
3811 | ||
3812 | /* Find listening sockets and check their link_mode */ | |
3813 | read_lock(&l2cap_sk_list.lock); | |
3814 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
3815 | if (sk->sk_state != BT_LISTEN) | |
3816 | continue; | |
3817 | ||
3818 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 MH |
3819 | lm1 |= HCI_LM_ACCEPT; |
3820 | if (l2cap_pi(sk)->role_switch) | |
3821 | lm1 |= HCI_LM_MASTER; | |
1da177e4 | 3822 | exact++; |
2af6b9d5 MH |
3823 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
3824 | lm2 |= HCI_LM_ACCEPT; | |
3825 | if (l2cap_pi(sk)->role_switch) | |
3826 | lm2 |= HCI_LM_MASTER; | |
3827 | } | |
1da177e4 LT |
3828 | } |
3829 | read_unlock(&l2cap_sk_list.lock); | |
3830 | ||
3831 | return exact ? lm1 : lm2; | |
3832 | } | |
3833 | ||
3834 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
3835 | { | |
0139418c MH |
3836 | struct l2cap_conn *conn; |
3837 | ||
1da177e4 LT |
3838 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
3839 | ||
acd7d370 | 3840 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 3841 | return -EINVAL; |
1da177e4 LT |
3842 | |
3843 | if (!status) { | |
1da177e4 LT |
3844 | conn = l2cap_conn_add(hcon, status); |
3845 | if (conn) | |
3846 | l2cap_conn_ready(conn); | |
0139418c | 3847 | } else |
1da177e4 LT |
3848 | l2cap_conn_del(hcon, bt_err(status)); |
3849 | ||
3850 | return 0; | |
3851 | } | |
3852 | ||
2950f21a MH |
3853 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
3854 | { | |
3855 | struct l2cap_conn *conn = hcon->l2cap_data; | |
3856 | ||
3857 | BT_DBG("hcon %p", hcon); | |
3858 | ||
3859 | if (hcon->type != ACL_LINK || !conn) | |
3860 | return 0x13; | |
3861 | ||
3862 | return conn->disc_reason; | |
3863 | } | |
3864 | ||
3865 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
3866 | { |
3867 | BT_DBG("hcon %p reason %d", hcon, reason); | |
3868 | ||
acd7d370 | 3869 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 3870 | return -EINVAL; |
1da177e4 LT |
3871 | |
3872 | l2cap_conn_del(hcon, bt_err(reason)); | |
0139418c | 3873 | |
1da177e4 LT |
3874 | return 0; |
3875 | } | |
3876 | ||
f62e4323 MH |
3877 | static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) |
3878 | { | |
bd3c9e25 | 3879 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) |
255c7601 MH |
3880 | return; |
3881 | ||
f62e4323 MH |
3882 | if (encrypt == 0x00) { |
3883 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { | |
3884 | l2cap_sock_clear_timer(sk); | |
3885 | l2cap_sock_set_timer(sk, HZ * 5); | |
3886 | } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) | |
3887 | __l2cap_sock_close(sk, ECONNREFUSED); | |
3888 | } else { | |
3889 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) | |
3890 | l2cap_sock_clear_timer(sk); | |
3891 | } | |
3892 | } | |
3893 | ||
8c1b2355 | 3894 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 3895 | { |
0139418c | 3896 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 3897 | struct l2cap_chan *chan; |
1da177e4 | 3898 | |
0139418c | 3899 | if (!conn) |
1da177e4 | 3900 | return 0; |
0139418c | 3901 | |
1da177e4 LT |
3902 | BT_DBG("conn %p", conn); |
3903 | ||
baa7e1fa | 3904 | read_lock(&conn->chan_lock); |
1da177e4 | 3905 | |
baa7e1fa | 3906 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 3907 | struct sock *sk = chan->sk; |
baa7e1fa | 3908 | |
1da177e4 LT |
3909 | bh_lock_sock(sk); |
3910 | ||
6a8d3010 MH |
3911 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) { |
3912 | bh_unlock_sock(sk); | |
3913 | continue; | |
3914 | } | |
3915 | ||
f62e4323 | 3916 | if (!status && (sk->sk_state == BT_CONNECTED || |
8c1b2355 | 3917 | sk->sk_state == BT_CONFIG)) { |
f62e4323 | 3918 | l2cap_check_encryption(sk, encrypt); |
9719f8af MH |
3919 | bh_unlock_sock(sk); |
3920 | continue; | |
3921 | } | |
3922 | ||
b1235d79 MH |
3923 | if (sk->sk_state == BT_CONNECT) { |
3924 | if (!status) { | |
3925 | struct l2cap_conn_req req; | |
3926 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
3927 | req.psm = l2cap_pi(sk)->psm; | |
1da177e4 | 3928 | |
fc7f8a7e | 3929 | chan->ident = l2cap_get_ident(conn); |
e501d055 | 3930 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 | 3931 | |
fc7f8a7e | 3932 | l2cap_send_cmd(conn, chan->ident, |
b1235d79 MH |
3933 | L2CAP_CONN_REQ, sizeof(req), &req); |
3934 | } else { | |
3935 | l2cap_sock_clear_timer(sk); | |
3936 | l2cap_sock_set_timer(sk, HZ / 10); | |
3937 | } | |
3938 | } else if (sk->sk_state == BT_CONNECT2) { | |
3939 | struct l2cap_conn_rsp rsp; | |
3940 | __u16 result; | |
1da177e4 | 3941 | |
b1235d79 MH |
3942 | if (!status) { |
3943 | sk->sk_state = BT_CONFIG; | |
3944 | result = L2CAP_CR_SUCCESS; | |
3945 | } else { | |
3946 | sk->sk_state = BT_DISCONN; | |
3947 | l2cap_sock_set_timer(sk, HZ / 10); | |
3948 | result = L2CAP_CR_SEC_BLOCK; | |
3949 | } | |
3950 | ||
3951 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
3952 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
3953 | rsp.result = cpu_to_le16(result); | |
e7c29cb1 | 3954 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
fc7f8a7e GP |
3955 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
3956 | sizeof(rsp), &rsp); | |
b1235d79 | 3957 | } |
1da177e4 LT |
3958 | |
3959 | bh_unlock_sock(sk); | |
3960 | } | |
3961 | ||
baa7e1fa | 3962 | read_unlock(&conn->chan_lock); |
b1235d79 | 3963 | |
1da177e4 LT |
3964 | return 0; |
3965 | } | |
3966 | ||
3967 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
3968 | { | |
3969 | struct l2cap_conn *conn = hcon->l2cap_data; | |
3970 | ||
5a08ecce AE |
3971 | if (!conn) |
3972 | conn = l2cap_conn_add(hcon, 0); | |
3973 | ||
3974 | if (!conn) | |
1da177e4 LT |
3975 | goto drop; |
3976 | ||
3977 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
3978 | ||
e702112f | 3979 | if (!(flags & ACL_CONT)) { |
1da177e4 | 3980 | struct l2cap_hdr *hdr; |
48454079 | 3981 | struct l2cap_chan *chan; |
89794813 | 3982 | u16 cid; |
1da177e4 LT |
3983 | int len; |
3984 | ||
3985 | if (conn->rx_len) { | |
3986 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
3987 | kfree_skb(conn->rx_skb); | |
3988 | conn->rx_skb = NULL; | |
3989 | conn->rx_len = 0; | |
3990 | l2cap_conn_unreliable(conn, ECOMM); | |
3991 | } | |
3992 | ||
aae7fe22 AE |
3993 | /* Start fragment always begin with Basic L2CAP header */ |
3994 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
3995 | BT_ERR("Frame is too short (len %d)", skb->len); |
3996 | l2cap_conn_unreliable(conn, ECOMM); | |
3997 | goto drop; | |
3998 | } | |
3999 | ||
4000 | hdr = (struct l2cap_hdr *) skb->data; | |
4001 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
89794813 | 4002 | cid = __le16_to_cpu(hdr->cid); |
1da177e4 LT |
4003 | |
4004 | if (len == skb->len) { | |
4005 | /* Complete frame received */ | |
4006 | l2cap_recv_frame(conn, skb); | |
4007 | return 0; | |
4008 | } | |
4009 | ||
4010 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
4011 | ||
4012 | if (skb->len > len) { | |
4013 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
4014 | skb->len, len); | |
4015 | l2cap_conn_unreliable(conn, ECOMM); | |
4016 | goto drop; | |
4017 | } | |
4018 | ||
baa7e1fa | 4019 | chan = l2cap_get_chan_by_scid(conn, cid); |
89794813 | 4020 | |
48454079 GP |
4021 | if (chan && chan->sk) { |
4022 | struct sock *sk = chan->sk; | |
89794813 | 4023 | |
48454079 GP |
4024 | if (l2cap_pi(sk)->imtu < len - L2CAP_HDR_SIZE) { |
4025 | BT_ERR("Frame exceeding recv MTU (len %d, " | |
4026 | "MTU %d)", len, | |
4027 | l2cap_pi(sk)->imtu); | |
4028 | bh_unlock_sock(sk); | |
4029 | l2cap_conn_unreliable(conn, ECOMM); | |
4030 | goto drop; | |
4031 | } | |
89794813 | 4032 | bh_unlock_sock(sk); |
48454079 | 4033 | } |
89794813 | 4034 | |
1da177e4 | 4035 | /* Allocate skb for the complete frame (with header) */ |
af05b30b GP |
4036 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
4037 | if (!conn->rx_skb) | |
1da177e4 LT |
4038 | goto drop; |
4039 | ||
d626f62b | 4040 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4041 | skb->len); |
1da177e4 LT |
4042 | conn->rx_len = len - skb->len; |
4043 | } else { | |
4044 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
4045 | ||
4046 | if (!conn->rx_len) { | |
4047 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
4048 | l2cap_conn_unreliable(conn, ECOMM); | |
4049 | goto drop; | |
4050 | } | |
4051 | ||
4052 | if (skb->len > conn->rx_len) { | |
4053 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
4054 | skb->len, conn->rx_len); | |
4055 | kfree_skb(conn->rx_skb); | |
4056 | conn->rx_skb = NULL; | |
4057 | conn->rx_len = 0; | |
4058 | l2cap_conn_unreliable(conn, ECOMM); | |
4059 | goto drop; | |
4060 | } | |
4061 | ||
d626f62b | 4062 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4063 | skb->len); |
1da177e4 LT |
4064 | conn->rx_len -= skb->len; |
4065 | ||
4066 | if (!conn->rx_len) { | |
4067 | /* Complete frame received */ | |
4068 | l2cap_recv_frame(conn, conn->rx_skb); | |
4069 | conn->rx_skb = NULL; | |
4070 | } | |
4071 | } | |
4072 | ||
4073 | drop: | |
4074 | kfree_skb(skb); | |
4075 | return 0; | |
4076 | } | |
4077 | ||
aef7d97c | 4078 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 LT |
4079 | { |
4080 | struct sock *sk; | |
4081 | struct hlist_node *node; | |
1da177e4 LT |
4082 | |
4083 | read_lock_bh(&l2cap_sk_list.lock); | |
4084 | ||
be9d1227 MH |
4085 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
4086 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
101545f6 | 4087 | |
903d343e | 4088 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
4089 | batostr(&bt_sk(sk)->src), |
4090 | batostr(&bt_sk(sk)->dst), | |
4091 | sk->sk_state, __le16_to_cpu(pi->psm), | |
4092 | pi->scid, pi->dcid, | |
903d343e GP |
4093 | pi->imtu, pi->omtu, pi->sec_level, |
4094 | pi->mode); | |
be9d1227 | 4095 | } |
1da177e4 | 4096 | |
1da177e4 | 4097 | read_unlock_bh(&l2cap_sk_list.lock); |
1da177e4 | 4098 | |
aef7d97c | 4099 | return 0; |
1da177e4 LT |
4100 | } |
4101 | ||
aef7d97c MH |
4102 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
4103 | { | |
4104 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
4105 | } | |
4106 | ||
4107 | static const struct file_operations l2cap_debugfs_fops = { | |
4108 | .open = l2cap_debugfs_open, | |
4109 | .read = seq_read, | |
4110 | .llseek = seq_lseek, | |
4111 | .release = single_release, | |
4112 | }; | |
4113 | ||
4114 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 4115 | |
1da177e4 LT |
4116 | static struct hci_proto l2cap_hci_proto = { |
4117 | .name = "L2CAP", | |
4118 | .id = HCI_PROTO_L2CAP, | |
4119 | .connect_ind = l2cap_connect_ind, | |
4120 | .connect_cfm = l2cap_connect_cfm, | |
4121 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4122 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4123 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4124 | .recv_acldata = l2cap_recv_acldata |
4125 | }; | |
4126 | ||
64274518 | 4127 | int __init l2cap_init(void) |
1da177e4 LT |
4128 | { |
4129 | int err; | |
be9d1227 | 4130 | |
bb58f747 | 4131 | err = l2cap_init_sockets(); |
1da177e4 LT |
4132 | if (err < 0) |
4133 | return err; | |
4134 | ||
1890d36b | 4135 | _busy_wq = create_singlethread_workqueue("l2cap"); |
b78d7b4f | 4136 | if (!_busy_wq) { |
bb58f747 | 4137 | err = -ENOMEM; |
1da177e4 LT |
4138 | goto error; |
4139 | } | |
4140 | ||
4141 | err = hci_register_proto(&l2cap_hci_proto); | |
4142 | if (err < 0) { | |
4143 | BT_ERR("L2CAP protocol registration failed"); | |
4144 | bt_sock_unregister(BTPROTO_L2CAP); | |
4145 | goto error; | |
4146 | } | |
4147 | ||
aef7d97c MH |
4148 | if (bt_debugfs) { |
4149 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4150 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4151 | if (!l2cap_debugfs) | |
4152 | BT_ERR("Failed to create L2CAP debug file"); | |
4153 | } | |
1da177e4 | 4154 | |
1da177e4 LT |
4155 | return 0; |
4156 | ||
4157 | error: | |
b78d7b4f | 4158 | destroy_workqueue(_busy_wq); |
bb58f747 | 4159 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4160 | return err; |
4161 | } | |
4162 | ||
64274518 | 4163 | void l2cap_exit(void) |
1da177e4 | 4164 | { |
aef7d97c | 4165 | debugfs_remove(l2cap_debugfs); |
1da177e4 | 4166 | |
1890d36b GP |
4167 | flush_workqueue(_busy_wq); |
4168 | destroy_workqueue(_busy_wq); | |
4169 | ||
1da177e4 LT |
4170 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) |
4171 | BT_ERR("L2CAP protocol unregistration failed"); | |
4172 | ||
bb58f747 | 4173 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4174 | } |
4175 | ||
d1c4a17d GP |
4176 | module_param(disable_ertm, bool, 0644); |
4177 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |