blob: 1842141baedb691c6bfb35b79090ed42223f1db4 [file] [log] [blame]
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001/*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
5 Copyright (C) 2010 Google Inc.
Gustavo F. Padovan590051d2011-12-18 13:39:33 -02006 Copyright (C) 2011 ProFUSION Embedded Systems
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02007
8 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
9
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License version 2 as
12 published by the Free Software Foundation;
13
14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
17 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
18 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
21 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22
23 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
24 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
25 SOFTWARE IS DISCLAIMED.
26*/
27
28/* Bluetooth L2CAP sockets. */
29
Johan Hedberg91497612013-12-02 11:20:20 +020030#include <linux/module.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040031#include <linux/export.h>
Paul Moore6230c9b2011-10-07 09:40:59 +000032
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -020033#include <net/bluetooth/bluetooth.h>
Gustavo F. Padovan33575df2011-02-04 02:48:48 -020034#include <net/bluetooth/hci_core.h>
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -020035#include <net/bluetooth/l2cap.h>
Marcel Holtmannac4b7232013-10-10 14:54:16 -070036
37#include "smp.h"
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -020038
Masatake YAMATO5b28d952012-07-26 01:29:25 +090039static struct bt_sock_list l2cap_sk_list = {
40 .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
41};
42
Gustavo F. Padovancf2f90f2011-04-27 18:40:39 -030043static const struct proto_ops l2cap_sock_ops;
Gustavo F. Padovan80808e42011-05-16 17:24:37 -030044static void l2cap_sock_init(struct sock *sk, struct sock *parent);
Gustavo Padovan2d792812012-10-06 10:07:01 +010045static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
Eric W. Biederman11aa9c22015-05-08 21:09:13 -050046 int proto, gfp_t prio, int kern);
Gustavo F. Padovancf2f90f2011-04-27 18:40:39 -030047
David Herrmannb3916db2013-04-05 14:57:34 +020048bool l2cap_is_socket(struct socket *sock)
49{
50 return sock && sock->ops == &l2cap_sock_ops;
51}
52EXPORT_SYMBOL(l2cap_is_socket);
53
Johan Hedberg49460962013-10-08 13:55:46 +020054static int l2cap_validate_bredr_psm(u16 psm)
55{
56 /* PSM must be odd and lsb of upper byte must be 0 */
57 if ((psm & 0x0101) != 0x0001)
58 return -EINVAL;
59
60 /* Restrict usage of well-known PSMs */
Johan Hedberg114f9f12016-01-26 17:19:09 -050061 if (psm < L2CAP_PSM_DYN_START && !capable(CAP_NET_BIND_SERVICE))
Johan Hedberg49460962013-10-08 13:55:46 +020062 return -EACCES;
63
64 return 0;
65}
66
67static int l2cap_validate_le_psm(u16 psm)
68{
69 /* Valid LE_PSM ranges are defined only until 0x00ff */
Johan Hedberg114f9f12016-01-26 17:19:09 -050070 if (psm > L2CAP_PSM_LE_DYN_END)
Johan Hedberg49460962013-10-08 13:55:46 +020071 return -EINVAL;
72
73 /* Restrict fixed, SIG assigned PSM values to CAP_NET_BIND_SERVICE */
Johan Hedberg114f9f12016-01-26 17:19:09 -050074 if (psm < L2CAP_PSM_LE_DYN_START && !capable(CAP_NET_BIND_SERVICE))
Johan Hedberg49460962013-10-08 13:55:46 +020075 return -EACCES;
76
77 return 0;
78}
79
Gustavo F. Padovanaf6bcd82011-02-04 02:40:28 -020080static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
81{
82 struct sock *sk = sock->sk;
Gustavo F. Padovan43434782011-04-12 18:31:57 -030083 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
Gustavo F. Padovanaf6bcd82011-02-04 02:40:28 -020084 struct sockaddr_l2 la;
85 int len, err = 0;
86
87 BT_DBG("sk %p", sk);
88
89 if (!addr || addr->sa_family != AF_BLUETOOTH)
90 return -EINVAL;
91
92 memset(&la, 0, sizeof(la));
93 len = min_t(unsigned int, sizeof(la), alen);
94 memcpy(&la, addr, len);
95
Ville Tervob62f3282011-02-10 22:38:50 -030096 if (la.l2_cid && la.l2_psm)
Gustavo F. Padovanaf6bcd82011-02-04 02:40:28 -020097 return -EINVAL;
98
Johan Hedberg80c1a2e2013-10-14 21:17:52 +030099 if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
100 return -EINVAL;
101
Johan Hedbergbfe46552013-10-16 17:13:26 +0300102 if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
Johan Hedbergbfe46552013-10-16 17:13:26 +0300103 /* We only allow ATT user space socket */
Johan Hedberg91497612013-12-02 11:20:20 +0200104 if (la.l2_cid &&
Joe Perchesdcf4adb2014-03-12 10:52:35 -0700105 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
Johan Hedbergbfe46552013-10-16 17:13:26 +0300106 return -EINVAL;
107 }
108
Gustavo F. Padovanaf6bcd82011-02-04 02:40:28 -0200109 lock_sock(sk);
110
111 if (sk->sk_state != BT_OPEN) {
112 err = -EBADFD;
113 goto done;
114 }
115
116 if (la.l2_psm) {
117 __u16 psm = __le16_to_cpu(la.l2_psm);
118
Johan Hedberg49460962013-10-08 13:55:46 +0200119 if (la.l2_bdaddr_type == BDADDR_BREDR)
120 err = l2cap_validate_bredr_psm(psm);
121 else
122 err = l2cap_validate_le_psm(psm);
Gustavo F. Padovanaf6bcd82011-02-04 02:40:28 -0200123
Johan Hedberg49460962013-10-08 13:55:46 +0200124 if (err)
Gustavo F. Padovanaf6bcd82011-02-04 02:40:28 -0200125 goto done;
Gustavo F. Padovanaf6bcd82011-02-04 02:40:28 -0200126 }
127
Johan Hedberga2342c52016-01-26 17:19:11 -0500128 bacpy(&chan->src, &la.l2_bdaddr);
129 chan->src_type = la.l2_bdaddr_type;
130
Ville Tervob62f3282011-02-10 22:38:50 -0300131 if (la.l2_cid)
Santosh Nayak6e4aff12012-03-01 22:46:36 +0530132 err = l2cap_add_scid(chan, __le16_to_cpu(la.l2_cid));
Gustavo F. Padovan9e4425f2011-04-18 18:38:43 -0300133 else
134 err = l2cap_add_psm(chan, &la.l2_bdaddr, la.l2_psm);
Ville Tervob62f3282011-02-10 22:38:50 -0300135
Gustavo F. Padovan9e4425f2011-04-18 18:38:43 -0300136 if (err < 0)
137 goto done;
138
Marcel Holtmann6a974b52013-10-12 07:19:31 -0700139 switch (chan->chan_type) {
Marcel Holtmann3124b842013-10-12 07:19:32 -0700140 case L2CAP_CHAN_CONN_LESS:
141 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_3DSP)
142 chan->sec_level = BT_SECURITY_SDP;
143 break;
Marcel Holtmann6a974b52013-10-12 07:19:31 -0700144 case L2CAP_CHAN_CONN_ORIENTED:
145 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_SDP ||
146 __le16_to_cpu(la.l2_psm) == L2CAP_PSM_RFCOMM)
147 chan->sec_level = BT_SECURITY_SDP;
148 break;
Johan Hedbergcb6ca8e2014-01-06 18:27:02 +0200149 case L2CAP_CHAN_RAW:
150 chan->sec_level = BT_SECURITY_SDP;
151 break;
Johan Hedbergc16900c2014-08-15 21:17:06 +0300152 case L2CAP_CHAN_FIXED:
153 /* Fixed channels default to the L2CAP core not holding a
154 * hci_conn reference for them. For fixed channels mapping to
155 * L2CAP sockets we do want to hold a reference so set the
156 * appropriate flag to request it.
157 */
158 set_bit(FLAG_HOLD_HCI_CONN, &chan->flags);
159 break;
Marcel Holtmann6a974b52013-10-12 07:19:31 -0700160 }
Gustavo F. Padovan9e4425f2011-04-18 18:38:43 -0300161
Johan Hedberg38319712013-05-17 12:49:23 +0300162 if (chan->psm && bdaddr_type_is_le(chan->src_type))
Johan Hedberg0ce43ce2013-12-05 14:55:33 +0200163 chan->mode = L2CAP_MODE_LE_FLOWCTL;
Johan Hedberg38319712013-05-17 12:49:23 +0300164
Gustavo F. Padovan89bc5002011-06-03 00:19:47 -0300165 chan->state = BT_BOUND;
Gustavo F. Padovan9e4425f2011-04-18 18:38:43 -0300166 sk->sk_state = BT_BOUND;
Gustavo F. Padovanaf6bcd82011-02-04 02:40:28 -0200167
168done:
169 release_sock(sk);
170 return err;
171}
172
Gustavo Padovan2d792812012-10-06 10:07:01 +0100173static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr,
174 int alen, int flags)
Gustavo F. Padovan4e34c502011-02-04 02:56:13 -0200175{
176 struct sock *sk = sock->sk;
Gustavo F. Padovan0c1bc5c2011-04-13 17:20:49 -0300177 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
Gustavo F. Padovan4e34c502011-02-04 02:56:13 -0200178 struct sockaddr_l2 la;
179 int len, err = 0;
180
181 BT_DBG("sk %p", sk);
182
183 if (!addr || alen < sizeof(addr->sa_family) ||
184 addr->sa_family != AF_BLUETOOTH)
185 return -EINVAL;
186
187 memset(&la, 0, sizeof(la));
188 len = min_t(unsigned int, sizeof(la), alen);
189 memcpy(&la, addr, len);
190
Ville Tervoacd7d372011-02-10 22:38:49 -0300191 if (la.l2_cid && la.l2_psm)
Gustavo F. Padovan4e34c502011-02-04 02:56:13 -0200192 return -EINVAL;
193
Johan Hedberg80c1a2e2013-10-14 21:17:52 +0300194 if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
195 return -EINVAL;
196
Johan Hedbergeb622492013-10-18 11:49:25 +0300197 /* Check that the socket wasn't bound to something that
198 * conflicts with the address given to connect(). If chan->src
199 * is BDADDR_ANY it means bind() was never used, in which case
200 * chan->src_type and la.l2_bdaddr_type do not need to match.
201 */
202 if (chan->src_type == BDADDR_BREDR && bacmp(&chan->src, BDADDR_ANY) &&
203 bdaddr_type_is_le(la.l2_bdaddr_type)) {
204 /* Old user space versions will try to incorrectly bind
205 * the ATT socket using BDADDR_BREDR. We need to accept
206 * this and fix up the source address type only when
207 * both the source CID and destination CID indicate
208 * ATT. Anything else is an invalid combination.
209 */
210 if (chan->scid != L2CAP_CID_ATT ||
Joe Perchesdcf4adb2014-03-12 10:52:35 -0700211 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
Johan Hedbergeb622492013-10-18 11:49:25 +0300212 return -EINVAL;
213
214 /* We don't have the hdev available here to make a
215 * better decision on random vs public, but since all
216 * user space versions that exhibit this issue anyway do
217 * not support random local addresses assuming public
218 * here is good enough.
219 */
220 chan->src_type = BDADDR_LE_PUBLIC;
221 }
Johan Hedberg1f209382013-10-14 21:17:53 +0300222
223 if (chan->src_type != BDADDR_BREDR && la.l2_bdaddr_type == BDADDR_BREDR)
224 return -EINVAL;
225
Johan Hedbergbfe46552013-10-16 17:13:26 +0300226 if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
Johan Hedbergbfe46552013-10-16 17:13:26 +0300227 /* We only allow ATT user space socket */
Johan Hedberg91497612013-12-02 11:20:20 +0200228 if (la.l2_cid &&
Joe Perchesdcf4adb2014-03-12 10:52:35 -0700229 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
Johan Hedbergbfe46552013-10-16 17:13:26 +0300230 return -EINVAL;
231 }
232
Johan Hedberg38319712013-05-17 12:49:23 +0300233 if (chan->psm && bdaddr_type_is_le(chan->src_type))
Johan Hedberg0ce43ce2013-12-05 14:55:33 +0200234 chan->mode = L2CAP_MODE_LE_FLOWCTL;
Johan Hedberg38319712013-05-17 12:49:23 +0300235
Santosh Nayak6e4aff12012-03-01 22:46:36 +0530236 err = l2cap_chan_connect(chan, la.l2_psm, __le16_to_cpu(la.l2_cid),
Andre Guedes8e9f9892012-04-24 21:02:55 -0300237 &la.l2_bdaddr, la.l2_bdaddr_type);
Gustavo F. Padovan4e34c502011-02-04 02:56:13 -0200238 if (err)
Andrei Emeltchenkob3fb6112012-02-22 17:11:57 +0200239 return err;
Gustavo F. Padovan4e34c502011-02-04 02:56:13 -0200240
Andrei Emeltchenko6be36552012-02-22 17:11:56 +0200241 lock_sock(sk);
242
Gustavo F. Padovan4e34c502011-02-04 02:56:13 -0200243 err = bt_sock_wait_state(sk, BT_CONNECTED,
Gustavo Padovan2d792812012-10-06 10:07:01 +0100244 sock_sndtimeo(sk, flags & O_NONBLOCK));
Andrei Emeltchenkob3fb6112012-02-22 17:11:57 +0200245
246 release_sock(sk);
247
Gustavo F. Padovan4e34c502011-02-04 02:56:13 -0200248 return err;
249}
250
Gustavo F. Padovanaf6bcd82011-02-04 02:40:28 -0200251static int l2cap_sock_listen(struct socket *sock, int backlog)
252{
253 struct sock *sk = sock->sk;
Gustavo F. Padovan0c1bc5c2011-04-13 17:20:49 -0300254 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
Gustavo F. Padovanaf6bcd82011-02-04 02:40:28 -0200255 int err = 0;
256
257 BT_DBG("sk %p backlog %d", sk, backlog);
258
259 lock_sock(sk);
260
Marcel Holtmann6b3af732012-04-19 13:43:51 +0200261 if (sk->sk_state != BT_BOUND) {
Gustavo F. Padovanaf6bcd82011-02-04 02:40:28 -0200262 err = -EBADFD;
263 goto done;
264 }
265
Marcel Holtmann6b3af732012-04-19 13:43:51 +0200266 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) {
267 err = -EINVAL;
268 goto done;
269 }
270
Gustavo F. Padovan0c1bc5c2011-04-13 17:20:49 -0300271 switch (chan->mode) {
Gustavo F. Padovanaf6bcd82011-02-04 02:40:28 -0200272 case L2CAP_MODE_BASIC:
Johan Hedberg38319712013-05-17 12:49:23 +0300273 case L2CAP_MODE_LE_FLOWCTL:
Gustavo F. Padovanaf6bcd82011-02-04 02:40:28 -0200274 break;
275 case L2CAP_MODE_ERTM:
276 case L2CAP_MODE_STREAMING:
277 if (!disable_ertm)
278 break;
279 /* fall through */
280 default:
Johan Hedbergbeb19e42014-07-18 11:15:26 +0300281 err = -EOPNOTSUPP;
Gustavo F. Padovanaf6bcd82011-02-04 02:40:28 -0200282 goto done;
283 }
284
Gustavo F. Padovanaf6bcd82011-02-04 02:40:28 -0200285 sk->sk_max_ack_backlog = backlog;
286 sk->sk_ack_backlog = 0;
Gustavo F. Padovan89bc5002011-06-03 00:19:47 -0300287
Johan Hedbergabe84902014-11-12 22:22:21 +0200288 /* Listening channels need to use nested locking in order not to
289 * cause lockdep warnings when the created child channels end up
290 * being locked in the same thread as the parent channel.
291 */
292 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
293
Gustavo F. Padovan89bc5002011-06-03 00:19:47 -0300294 chan->state = BT_LISTEN;
Gustavo F. Padovanaf6bcd82011-02-04 02:40:28 -0200295 sk->sk_state = BT_LISTEN;
296
297done:
298 release_sock(sk);
299 return err;
300}
301
Gustavo Padovan2d792812012-10-06 10:07:01 +0100302static int l2cap_sock_accept(struct socket *sock, struct socket *newsock,
303 int flags)
Gustavo F. Padovanc47b7c72011-02-04 02:42:23 -0200304{
Peter Hurleydfb2fae2015-01-23 12:16:53 -0500305 DEFINE_WAIT_FUNC(wait, woken_wake_function);
Gustavo F. Padovanc47b7c72011-02-04 02:42:23 -0200306 struct sock *sk = sock->sk, *nsk;
307 long timeo;
308 int err = 0;
309
Johan Hedberg3b2ab392014-11-12 22:22:22 +0200310 lock_sock_nested(sk, L2CAP_NESTING_PARENT);
Gustavo F. Padovanc47b7c72011-02-04 02:42:23 -0200311
Gustavo F. Padovanc47b7c72011-02-04 02:42:23 -0200312 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
313
314 BT_DBG("sk %p timeo %ld", sk, timeo);
315
316 /* Wait for an incoming connection. (wake-one). */
317 add_wait_queue_exclusive(sk_sleep(sk), &wait);
Peter Hurleyf9a3c202011-07-24 00:10:52 -0400318 while (1) {
Gustavo F. Padovanc47b7c72011-02-04 02:42:23 -0200319 if (sk->sk_state != BT_LISTEN) {
320 err = -EBADFD;
321 break;
322 }
323
Peter Hurleyf9a3c202011-07-24 00:10:52 -0400324 nsk = bt_accept_dequeue(sk, newsock);
325 if (nsk)
326 break;
327
328 if (!timeo) {
329 err = -EAGAIN;
330 break;
331 }
332
Gustavo F. Padovanc47b7c72011-02-04 02:42:23 -0200333 if (signal_pending(current)) {
334 err = sock_intr_errno(timeo);
335 break;
336 }
Peter Hurleyf9a3c202011-07-24 00:10:52 -0400337
338 release_sock(sk);
Peter Hurleydfb2fae2015-01-23 12:16:53 -0500339
340 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
341
Johan Hedberg3b2ab392014-11-12 22:22:22 +0200342 lock_sock_nested(sk, L2CAP_NESTING_PARENT);
Gustavo F. Padovanc47b7c72011-02-04 02:42:23 -0200343 }
Gustavo F. Padovanc47b7c72011-02-04 02:42:23 -0200344 remove_wait_queue(sk_sleep(sk), &wait);
345
346 if (err)
347 goto done;
348
349 newsock->state = SS_CONNECTED;
350
351 BT_DBG("new socket %p", nsk);
352
353done:
354 release_sock(sk);
355 return err;
356}
357
Gustavo Padovan2d792812012-10-06 10:07:01 +0100358static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr,
359 int *len, int peer)
Gustavo F. Padovand7175d52011-02-04 02:43:46 -0200360{
361 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
362 struct sock *sk = sock->sk;
Gustavo F. Padovan0c1bc5c2011-04-13 17:20:49 -0300363 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
Gustavo F. Padovand7175d52011-02-04 02:43:46 -0200364
365 BT_DBG("sock %p, sk %p", sock, sk);
366
Johan Hedberge8b1ab92014-03-26 15:49:18 +0200367 if (peer && sk->sk_state != BT_CONNECTED &&
Johan Hedbergbf19d512014-07-01 12:07:23 +0300368 sk->sk_state != BT_CONNECT && sk->sk_state != BT_CONNECT2 &&
369 sk->sk_state != BT_CONFIG)
Johan Hedbergb783fbc2014-01-28 15:16:49 -0800370 return -ENOTCONN;
371
Mathias Krause792039c2012-08-15 11:31:51 +0000372 memset(la, 0, sizeof(struct sockaddr_l2));
Gustavo F. Padovand7175d52011-02-04 02:43:46 -0200373 addr->sa_family = AF_BLUETOOTH;
374 *len = sizeof(struct sockaddr_l2);
375
Johan Hedbergd7e5e762014-01-28 15:16:51 -0800376 la->l2_psm = chan->psm;
377
Gustavo F. Padovand7175d52011-02-04 02:43:46 -0200378 if (peer) {
Marcel Holtmann7eafc592013-10-13 08:12:47 -0700379 bacpy(&la->l2_bdaddr, &chan->dst);
Gustavo F. Padovanfe4128e2011-04-13 19:50:45 -0300380 la->l2_cid = cpu_to_le16(chan->dcid);
Marcel Holtmann4f1654e2013-10-13 08:50:41 -0700381 la->l2_bdaddr_type = chan->dst_type;
Gustavo F. Padovand7175d52011-02-04 02:43:46 -0200382 } else {
Marcel Holtmann7eafc592013-10-13 08:12:47 -0700383 bacpy(&la->l2_bdaddr, &chan->src);
Gustavo F. Padovanfe4128e2011-04-13 19:50:45 -0300384 la->l2_cid = cpu_to_le16(chan->scid);
Marcel Holtmann4f1654e2013-10-13 08:50:41 -0700385 la->l2_bdaddr_type = chan->src_type;
Gustavo F. Padovand7175d52011-02-04 02:43:46 -0200386 }
387
388 return 0;
389}
390
Gustavo Padovan2d792812012-10-06 10:07:01 +0100391static int l2cap_sock_getsockopt_old(struct socket *sock, int optname,
392 char __user *optval, int __user *optlen)
Gustavo F. Padovan99f48082011-02-04 02:52:55 -0200393{
394 struct sock *sk = sock->sk;
Gustavo F. Padovan43434782011-04-12 18:31:57 -0300395 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
Gustavo F. Padovan99f48082011-02-04 02:52:55 -0200396 struct l2cap_options opts;
397 struct l2cap_conninfo cinfo;
398 int len, err = 0;
399 u32 opt;
400
401 BT_DBG("sk %p", sk);
402
403 if (get_user(len, optlen))
404 return -EFAULT;
405
406 lock_sock(sk);
407
408 switch (optname) {
409 case L2CAP_OPTIONS:
Johan Hedberg64b4f8d2013-12-02 16:02:03 +0200410 /* LE sockets should use BT_SNDMTU/BT_RCVMTU, but since
411 * legacy ATT code depends on getsockopt for
412 * L2CAP_OPTIONS we need to let this pass.
413 */
414 if (bdaddr_type_is_le(chan->src_type) &&
415 chan->scid != L2CAP_CID_ATT) {
416 err = -EINVAL;
417 break;
418 }
419
Vasiliy Kulikove3fb5922011-02-10 20:59:42 +0300420 memset(&opts, 0, sizeof(opts));
Gustavo F. Padovan0c1bc5c2011-04-13 17:20:49 -0300421 opts.imtu = chan->imtu;
422 opts.omtu = chan->omtu;
423 opts.flush_to = chan->flush_to;
424 opts.mode = chan->mode;
Gustavo F. Padovan47d1ec62011-04-13 15:57:03 -0300425 opts.fcs = chan->fcs;
426 opts.max_tx = chan->max_tx;
Andrei Emeltchenko6327eb92011-10-11 13:37:42 +0300427 opts.txwin_size = chan->tx_win;
Gustavo F. Padovan99f48082011-02-04 02:52:55 -0200428
429 len = min_t(unsigned int, len, sizeof(opts));
430 if (copy_to_user(optval, (char *) &opts, len))
431 err = -EFAULT;
432
433 break;
434
435 case L2CAP_LM:
Gustavo F. Padovan43434782011-04-12 18:31:57 -0300436 switch (chan->sec_level) {
Gustavo F. Padovan99f48082011-02-04 02:52:55 -0200437 case BT_SECURITY_LOW:
438 opt = L2CAP_LM_AUTH;
439 break;
440 case BT_SECURITY_MEDIUM:
441 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
442 break;
443 case BT_SECURITY_HIGH:
444 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
Gustavo Padovan2d792812012-10-06 10:07:01 +0100445 L2CAP_LM_SECURE;
Gustavo F. Padovan99f48082011-02-04 02:52:55 -0200446 break;
Marcel Holtmann7d513e92014-01-15 22:37:40 -0800447 case BT_SECURITY_FIPS:
448 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
449 L2CAP_LM_SECURE | L2CAP_LM_FIPS;
450 break;
Gustavo F. Padovan99f48082011-02-04 02:52:55 -0200451 default:
452 opt = 0;
453 break;
454 }
455
Andrei Emeltchenko43bd0f32011-10-11 14:04:34 +0300456 if (test_bit(FLAG_ROLE_SWITCH, &chan->flags))
Gustavo F. Padovan99f48082011-02-04 02:52:55 -0200457 opt |= L2CAP_LM_MASTER;
458
Andrei Emeltchenkoecf61bd2011-10-11 14:04:32 +0300459 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
Gustavo F. Padovan99f48082011-02-04 02:52:55 -0200460 opt |= L2CAP_LM_RELIABLE;
461
462 if (put_user(opt, (u32 __user *) optval))
463 err = -EFAULT;
Marcel Holtmann7d513e92014-01-15 22:37:40 -0800464
Gustavo F. Padovan99f48082011-02-04 02:52:55 -0200465 break;
466
467 case L2CAP_CONNINFO:
468 if (sk->sk_state != BT_CONNECTED &&
Gustavo Padovanc5daa682012-05-16 12:17:10 -0300469 !(sk->sk_state == BT_CONNECT2 &&
470 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
Gustavo F. Padovan99f48082011-02-04 02:52:55 -0200471 err = -ENOTCONN;
472 break;
473 }
474
Filip Palian8d03e972011-05-12 19:32:46 +0200475 memset(&cinfo, 0, sizeof(cinfo));
Gustavo F. Padovan8c1d7872011-04-13 20:23:55 -0300476 cinfo.hci_handle = chan->conn->hcon->handle;
477 memcpy(cinfo.dev_class, chan->conn->hcon->dev_class, 3);
Gustavo F. Padovan99f48082011-02-04 02:52:55 -0200478
479 len = min_t(unsigned int, len, sizeof(cinfo));
480 if (copy_to_user(optval, (char *) &cinfo, len))
481 err = -EFAULT;
482
483 break;
484
485 default:
486 err = -ENOPROTOOPT;
487 break;
488 }
489
490 release_sock(sk);
491 return err;
492}
493
Gustavo Padovan2d792812012-10-06 10:07:01 +0100494static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname,
495 char __user *optval, int __user *optlen)
Gustavo F. Padovan99f48082011-02-04 02:52:55 -0200496{
497 struct sock *sk = sock->sk;
Gustavo F. Padovan43434782011-04-12 18:31:57 -0300498 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
Gustavo F. Padovan99f48082011-02-04 02:52:55 -0200499 struct bt_security sec;
Jaikumar Ganesh14b12d02011-05-23 18:06:04 -0700500 struct bt_power pwr;
Gustavo F. Padovan99f48082011-02-04 02:52:55 -0200501 int len, err = 0;
502
503 BT_DBG("sk %p", sk);
504
505 if (level == SOL_L2CAP)
506 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
507
508 if (level != SOL_BLUETOOTH)
509 return -ENOPROTOOPT;
510
511 if (get_user(len, optlen))
512 return -EFAULT;
513
514 lock_sock(sk);
515
516 switch (optname) {
517 case BT_SECURITY:
Gustavo F. Padovan715ec002011-05-02 17:13:55 -0300518 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
Johan Hedberge0c888a2014-01-25 17:10:07 -0500519 chan->chan_type != L2CAP_CHAN_FIXED &&
Gustavo Padovan2d792812012-10-06 10:07:01 +0100520 chan->chan_type != L2CAP_CHAN_RAW) {
Gustavo F. Padovan99f48082011-02-04 02:52:55 -0200521 err = -EINVAL;
522 break;
523 }
524
Vinicius Costa Gomes8f360112011-07-08 18:31:46 -0300525 memset(&sec, 0, sizeof(sec));
Andrei Emeltchenko85e34362012-10-05 16:56:54 +0300526 if (chan->conn) {
Gustavo Padovanc6585a42012-05-07 03:07:26 -0300527 sec.level = chan->conn->hcon->sec_level;
Gustavo F. Padovan99f48082011-02-04 02:52:55 -0200528
Andrei Emeltchenko85e34362012-10-05 16:56:54 +0300529 if (sk->sk_state == BT_CONNECTED)
530 sec.key_size = chan->conn->hcon->enc_key_size;
531 } else {
532 sec.level = chan->sec_level;
533 }
Vinicius Costa Gomes8f360112011-07-08 18:31:46 -0300534
Gustavo F. Padovan99f48082011-02-04 02:52:55 -0200535 len = min_t(unsigned int, len, sizeof(sec));
536 if (copy_to_user(optval, (char *) &sec, len))
537 err = -EFAULT;
538
539 break;
540
541 case BT_DEFER_SETUP:
542 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
543 err = -EINVAL;
544 break;
545 }
546
Gustavo Padovanc5daa682012-05-16 12:17:10 -0300547 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
548 (u32 __user *) optval))
Gustavo F. Padovan99f48082011-02-04 02:52:55 -0200549 err = -EFAULT;
550
551 break;
552
553 case BT_FLUSHABLE:
Andrei Emeltchenkod57b0e82011-10-11 14:04:31 +0300554 if (put_user(test_bit(FLAG_FLUSHABLE, &chan->flags),
Gustavo Padovan2d792812012-10-06 10:07:01 +0100555 (u32 __user *) optval))
Gustavo F. Padovan99f48082011-02-04 02:52:55 -0200556 err = -EFAULT;
557
558 break;
559
Jaikumar Ganesh14b12d02011-05-23 18:06:04 -0700560 case BT_POWER:
561 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
Gustavo Padovan2d792812012-10-06 10:07:01 +0100562 && sk->sk_type != SOCK_RAW) {
Jaikumar Ganesh14b12d02011-05-23 18:06:04 -0700563 err = -EINVAL;
564 break;
565 }
566
Andrei Emeltchenko15770b12011-10-11 14:04:33 +0300567 pwr.force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
Jaikumar Ganesh14b12d02011-05-23 18:06:04 -0700568
569 len = min_t(unsigned int, len, sizeof(pwr));
570 if (copy_to_user(optval, (char *) &pwr, len))
571 err = -EFAULT;
572
573 break;
574
Mat Martineau2ea66482011-11-02 16:18:30 -0700575 case BT_CHANNEL_POLICY:
Mat Martineau2ea66482011-11-02 16:18:30 -0700576 if (put_user(chan->chan_policy, (u32 __user *) optval))
577 err = -EFAULT;
578 break;
579
Johan Hedberg1f435422013-12-02 16:34:18 +0200580 case BT_SNDMTU:
Johan Hedberg1f435422013-12-02 16:34:18 +0200581 if (!bdaddr_type_is_le(chan->src_type)) {
582 err = -EINVAL;
583 break;
584 }
585
586 if (sk->sk_state != BT_CONNECTED) {
587 err = -ENOTCONN;
588 break;
589 }
590
591 if (put_user(chan->omtu, (u16 __user *) optval))
592 err = -EFAULT;
593 break;
594
595 case BT_RCVMTU:
Johan Hedberg1f435422013-12-02 16:34:18 +0200596 if (!bdaddr_type_is_le(chan->src_type)) {
597 err = -EINVAL;
598 break;
599 }
600
601 if (put_user(chan->imtu, (u16 __user *) optval))
602 err = -EFAULT;
603 break;
604
Gustavo F. Padovan99f48082011-02-04 02:52:55 -0200605 default:
606 err = -ENOPROTOOPT;
607 break;
608 }
609
610 release_sock(sk);
611 return err;
612}
613
Andre Guedes682877c2012-05-31 17:01:34 -0300614static bool l2cap_valid_mtu(struct l2cap_chan *chan, u16 mtu)
615{
616 switch (chan->scid) {
Johan Hedberg073d1cf2013-04-29 19:35:35 +0300617 case L2CAP_CID_ATT:
Andre Guedes8c3a4f02012-05-31 17:01:35 -0300618 if (mtu < L2CAP_LE_MIN_MTU)
Andre Guedes682877c2012-05-31 17:01:34 -0300619 return false;
620 break;
621
622 default:
623 if (mtu < L2CAP_DEFAULT_MIN_MTU)
624 return false;
625 }
626
627 return true;
628}
629
Gustavo Padovan2d792812012-10-06 10:07:01 +0100630static int l2cap_sock_setsockopt_old(struct socket *sock, int optname,
631 char __user *optval, unsigned int optlen)
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200632{
633 struct sock *sk = sock->sk;
Gustavo F. Padovanb4450032011-04-12 18:15:09 -0300634 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200635 struct l2cap_options opts;
636 int len, err = 0;
637 u32 opt;
638
639 BT_DBG("sk %p", sk);
640
641 lock_sock(sk);
642
643 switch (optname) {
644 case L2CAP_OPTIONS:
Johan Hedberg64b4f8d2013-12-02 16:02:03 +0200645 if (bdaddr_type_is_le(chan->src_type)) {
646 err = -EINVAL;
647 break;
648 }
649
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200650 if (sk->sk_state == BT_CONNECTED) {
651 err = -EINVAL;
652 break;
653 }
654
Gustavo F. Padovan0c1bc5c2011-04-13 17:20:49 -0300655 opts.imtu = chan->imtu;
656 opts.omtu = chan->omtu;
657 opts.flush_to = chan->flush_to;
658 opts.mode = chan->mode;
Gustavo F. Padovan47d1ec62011-04-13 15:57:03 -0300659 opts.fcs = chan->fcs;
660 opts.max_tx = chan->max_tx;
Andrei Emeltchenko6327eb92011-10-11 13:37:42 +0300661 opts.txwin_size = chan->tx_win;
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200662
663 len = min_t(unsigned int, sizeof(opts), optlen);
664 if (copy_from_user((char *) &opts, optval, len)) {
665 err = -EFAULT;
666 break;
667 }
668
Andrei Emeltchenko6327eb92011-10-11 13:37:42 +0300669 if (opts.txwin_size > L2CAP_DEFAULT_EXT_WINDOW) {
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200670 err = -EINVAL;
671 break;
672 }
673
Andre Guedes682877c2012-05-31 17:01:34 -0300674 if (!l2cap_valid_mtu(chan, opts.imtu)) {
675 err = -EINVAL;
676 break;
677 }
678
Gustavo F. Padovan0c1bc5c2011-04-13 17:20:49 -0300679 chan->mode = opts.mode;
680 switch (chan->mode) {
Johan Hedberg38319712013-05-17 12:49:23 +0300681 case L2CAP_MODE_LE_FLOWCTL:
682 break;
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200683 case L2CAP_MODE_BASIC:
Gustavo F. Padovanc1360a12011-06-10 17:02:12 -0300684 clear_bit(CONF_STATE2_DEVICE, &chan->conf_state);
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200685 break;
686 case L2CAP_MODE_ERTM:
687 case L2CAP_MODE_STREAMING:
688 if (!disable_ertm)
689 break;
690 /* fall through */
691 default:
692 err = -EINVAL;
693 break;
694 }
695
Gustavo F. Padovan0c1bc5c2011-04-13 17:20:49 -0300696 chan->imtu = opts.imtu;
697 chan->omtu = opts.omtu;
Gustavo F. Padovan47d1ec62011-04-13 15:57:03 -0300698 chan->fcs = opts.fcs;
699 chan->max_tx = opts.max_tx;
Andrei Emeltchenko6327eb92011-10-11 13:37:42 +0300700 chan->tx_win = opts.txwin_size;
Andrei Emeltchenko12d59782012-10-10 17:38:26 +0300701 chan->flush_to = opts.flush_to;
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200702 break;
703
704 case L2CAP_LM:
705 if (get_user(opt, (u32 __user *) optval)) {
706 err = -EFAULT;
707 break;
708 }
709
Marcel Holtmann7d513e92014-01-15 22:37:40 -0800710 if (opt & L2CAP_LM_FIPS) {
711 err = -EINVAL;
712 break;
713 }
714
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200715 if (opt & L2CAP_LM_AUTH)
Gustavo F. Padovan43434782011-04-12 18:31:57 -0300716 chan->sec_level = BT_SECURITY_LOW;
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200717 if (opt & L2CAP_LM_ENCRYPT)
Gustavo F. Padovan43434782011-04-12 18:31:57 -0300718 chan->sec_level = BT_SECURITY_MEDIUM;
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200719 if (opt & L2CAP_LM_SECURE)
Gustavo F. Padovan43434782011-04-12 18:31:57 -0300720 chan->sec_level = BT_SECURITY_HIGH;
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200721
Andrei Emeltchenko43bd0f32011-10-11 14:04:34 +0300722 if (opt & L2CAP_LM_MASTER)
723 set_bit(FLAG_ROLE_SWITCH, &chan->flags);
724 else
725 clear_bit(FLAG_ROLE_SWITCH, &chan->flags);
Andrei Emeltchenkoecf61bd2011-10-11 14:04:32 +0300726
727 if (opt & L2CAP_LM_RELIABLE)
728 set_bit(FLAG_FORCE_RELIABLE, &chan->flags);
729 else
730 clear_bit(FLAG_FORCE_RELIABLE, &chan->flags);
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200731 break;
732
733 default:
734 err = -ENOPROTOOPT;
735 break;
736 }
737
738 release_sock(sk);
739 return err;
740}
741
Gustavo Padovan2d792812012-10-06 10:07:01 +0100742static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
743 char __user *optval, unsigned int optlen)
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200744{
745 struct sock *sk = sock->sk;
Gustavo F. Padovan43434782011-04-12 18:31:57 -0300746 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200747 struct bt_security sec;
Jaikumar Ganesh14b12d02011-05-23 18:06:04 -0700748 struct bt_power pwr;
Vinicius Costa Gomesf1cb9af2011-01-26 21:42:57 -0300749 struct l2cap_conn *conn;
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200750 int len, err = 0;
751 u32 opt;
752
753 BT_DBG("sk %p", sk);
754
755 if (level == SOL_L2CAP)
756 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
757
758 if (level != SOL_BLUETOOTH)
759 return -ENOPROTOOPT;
760
761 lock_sock(sk);
762
763 switch (optname) {
764 case BT_SECURITY:
Gustavo F. Padovan715ec002011-05-02 17:13:55 -0300765 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
Johan Hedberge0c888a2014-01-25 17:10:07 -0500766 chan->chan_type != L2CAP_CHAN_FIXED &&
Gustavo Padovan2d792812012-10-06 10:07:01 +0100767 chan->chan_type != L2CAP_CHAN_RAW) {
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200768 err = -EINVAL;
769 break;
770 }
771
772 sec.level = BT_SECURITY_LOW;
773
774 len = min_t(unsigned int, sizeof(sec), optlen);
775 if (copy_from_user((char *) &sec, optval, len)) {
776 err = -EFAULT;
777 break;
778 }
779
780 if (sec.level < BT_SECURITY_LOW ||
Patrik Flykta164cee2016-03-24 16:04:15 +0200781 sec.level > BT_SECURITY_FIPS) {
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200782 err = -EINVAL;
783 break;
784 }
785
Gustavo F. Padovan43434782011-04-12 18:31:57 -0300786 chan->sec_level = sec.level;
Vinicius Costa Gomesf1cb9af2011-01-26 21:42:57 -0300787
Gustavo F. Padovan0bee1d62011-11-05 19:58:31 -0200788 if (!chan->conn)
789 break;
790
Vinicius Costa Gomesf1cb9af2011-01-26 21:42:57 -0300791 conn = chan->conn;
Gustavo F. Padovan0bee1d62011-11-05 19:58:31 -0200792
793 /*change security for LE channels */
Johan Hedberg073d1cf2013-04-29 19:35:35 +0300794 if (chan->scid == L2CAP_CID_ATT) {
Vinicius Costa Gomescc110922012-08-23 21:32:43 -0300795 if (smp_conn_security(conn->hcon, sec.level))
Vinicius Costa Gomesf1cb9af2011-01-26 21:42:57 -0300796 break;
Johan Hedbergd52deb12014-08-07 22:56:44 +0300797 set_bit(FLAG_PENDING_SECURITY, &chan->flags);
Vinicius Costa Gomesf1cb9af2011-01-26 21:42:57 -0300798 sk->sk_state = BT_CONFIG;
Gustavo F. Padovan3542b8542011-12-28 13:54:17 -0200799 chan->state = BT_CONFIG;
Gustavo F. Padovan0bee1d62011-11-05 19:58:31 -0200800
Gustavo Padovana7d77232012-05-13 03:20:07 -0300801 /* or for ACL link */
802 } else if ((sk->sk_state == BT_CONNECT2 &&
Gustavo Padovan2d792812012-10-06 10:07:01 +0100803 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) ||
Gustavo Padovana7d77232012-05-13 03:20:07 -0300804 sk->sk_state == BT_CONNECTED) {
Johan Hedberge7cafc42014-07-17 15:35:38 +0300805 if (!l2cap_chan_check_security(chan, true))
Gustavo Padovanc5daa682012-05-16 12:17:10 -0300806 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
Gustavo Padovana7d77232012-05-13 03:20:07 -0300807 else
808 sk->sk_state_change(sk);
Gustavo F. Padovan0bee1d62011-11-05 19:58:31 -0200809 } else {
810 err = -EINVAL;
Vinicius Costa Gomesf1cb9af2011-01-26 21:42:57 -0300811 }
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200812 break;
813
814 case BT_DEFER_SETUP:
815 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
816 err = -EINVAL;
817 break;
818 }
819
820 if (get_user(opt, (u32 __user *) optval)) {
821 err = -EFAULT;
822 break;
823 }
824
Marcel Holtmannbdc25782013-10-14 02:45:34 -0700825 if (opt) {
Gustavo Padovanc5daa682012-05-16 12:17:10 -0300826 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
Marcel Holtmannbdc25782013-10-14 02:45:34 -0700827 set_bit(FLAG_DEFER_SETUP, &chan->flags);
828 } else {
Gustavo Padovanc5daa682012-05-16 12:17:10 -0300829 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
Marcel Holtmannbdc25782013-10-14 02:45:34 -0700830 clear_bit(FLAG_DEFER_SETUP, &chan->flags);
831 }
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200832 break;
833
834 case BT_FLUSHABLE:
835 if (get_user(opt, (u32 __user *) optval)) {
836 err = -EFAULT;
837 break;
838 }
839
840 if (opt > BT_FLUSHABLE_ON) {
841 err = -EINVAL;
842 break;
843 }
844
845 if (opt == BT_FLUSHABLE_OFF) {
Johannes Bergc1f23a22013-10-07 18:19:16 +0200846 conn = chan->conn;
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300847 /* proceed further only when we have l2cap_conn and
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200848 No Flush support in the LM */
849 if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) {
850 err = -EINVAL;
851 break;
852 }
853 }
854
Andrei Emeltchenkod57b0e82011-10-11 14:04:31 +0300855 if (opt)
856 set_bit(FLAG_FLUSHABLE, &chan->flags);
857 else
858 clear_bit(FLAG_FLUSHABLE, &chan->flags);
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200859 break;
860
Jaikumar Ganesh14b12d02011-05-23 18:06:04 -0700861 case BT_POWER:
862 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
Gustavo Padovan2d792812012-10-06 10:07:01 +0100863 chan->chan_type != L2CAP_CHAN_RAW) {
Jaikumar Ganesh14b12d02011-05-23 18:06:04 -0700864 err = -EINVAL;
865 break;
866 }
867
868 pwr.force_active = BT_POWER_FORCE_ACTIVE_ON;
869
870 len = min_t(unsigned int, sizeof(pwr), optlen);
871 if (copy_from_user((char *) &pwr, optval, len)) {
872 err = -EFAULT;
873 break;
874 }
Andrei Emeltchenko15770b12011-10-11 14:04:33 +0300875
876 if (pwr.force_active)
877 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
878 else
879 clear_bit(FLAG_FORCE_ACTIVE, &chan->flags);
Jaikumar Ganesh14b12d02011-05-23 18:06:04 -0700880 break;
881
Mat Martineau2ea66482011-11-02 16:18:30 -0700882 case BT_CHANNEL_POLICY:
Mat Martineau2ea66482011-11-02 16:18:30 -0700883 if (get_user(opt, (u32 __user *) optval)) {
884 err = -EFAULT;
885 break;
886 }
887
888 if (opt > BT_CHANNEL_POLICY_AMP_PREFERRED) {
889 err = -EINVAL;
890 break;
891 }
892
893 if (chan->mode != L2CAP_MODE_ERTM &&
Gustavo Padovan2d792812012-10-06 10:07:01 +0100894 chan->mode != L2CAP_MODE_STREAMING) {
Mat Martineau2ea66482011-11-02 16:18:30 -0700895 err = -EOPNOTSUPP;
896 break;
897 }
898
899 chan->chan_policy = (u8) opt;
Mat Martineau3f7a56c2012-10-23 15:24:23 -0700900
901 if (sk->sk_state == BT_CONNECTED &&
902 chan->move_role == L2CAP_MOVE_ROLE_NONE)
903 l2cap_move_start(chan);
904
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200905 break;
906
Johan Hedberg1f435422013-12-02 16:34:18 +0200907 case BT_SNDMTU:
Johan Hedberg1f435422013-12-02 16:34:18 +0200908 if (!bdaddr_type_is_le(chan->src_type)) {
909 err = -EINVAL;
910 break;
911 }
912
913 /* Setting is not supported as it's the remote side that
914 * decides this.
915 */
916 err = -EPERM;
917 break;
918
919 case BT_RCVMTU:
Johan Hedberg1f435422013-12-02 16:34:18 +0200920 if (!bdaddr_type_is_le(chan->src_type)) {
921 err = -EINVAL;
922 break;
923 }
924
925 if (sk->sk_state == BT_CONNECTED) {
926 err = -EISCONN;
927 break;
928 }
929
Amadeusz Sławiński23bc6ab2016-07-14 10:50:23 +0200930 if (get_user(opt, (u16 __user *) optval)) {
Johan Hedberg1f435422013-12-02 16:34:18 +0200931 err = -EFAULT;
932 break;
933 }
934
935 chan->imtu = opt;
936 break;
937
Gustavo F. Padovan33575df2011-02-04 02:48:48 -0200938 default:
939 err = -ENOPROTOOPT;
940 break;
941 }
942
943 release_sock(sk);
944 return err;
945}
946
Ying Xue1b784142015-03-02 15:37:48 +0800947static int l2cap_sock_sendmsg(struct socket *sock, struct msghdr *msg,
948 size_t len)
Gustavo F. Padovanfd83ccd2011-02-04 03:20:52 -0200949{
950 struct sock *sk = sock->sk;
Gustavo F. Padovan0c1bc5c2011-04-13 17:20:49 -0300951 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
Gustavo F. Padovanfd83ccd2011-02-04 03:20:52 -0200952 int err;
953
954 BT_DBG("sock %p, sk %p", sock, sk);
955
956 err = sock_error(sk);
957 if (err)
958 return err;
959
960 if (msg->msg_flags & MSG_OOB)
961 return -EOPNOTSUPP;
962
Mat Martineaua6a55682012-05-04 14:20:31 -0700963 if (sk->sk_state != BT_CONNECTED)
Gustavo F. Padovan9a91a042011-04-28 18:50:17 -0300964 return -ENOTCONN;
Gustavo F. Padovanfd83ccd2011-02-04 03:20:52 -0200965
Johan Hedberge793dcf2013-09-16 13:05:19 +0300966 lock_sock(sk);
967 err = bt_sock_wait_ready(sk, msg->msg_flags);
968 release_sock(sk);
969 if (err)
970 return err;
971
Mat Martineaua6a55682012-05-04 14:20:31 -0700972 l2cap_chan_lock(chan);
Marcel Holtmann8d463212014-06-05 15:22:51 +0200973 err = l2cap_chan_send(chan, msg, len);
Mat Martineaua6a55682012-05-04 14:20:31 -0700974 l2cap_chan_unlock(chan);
Gustavo F. Padovanfd83ccd2011-02-04 03:20:52 -0200975
Gustavo F. Padovanfd83ccd2011-02-04 03:20:52 -0200976 return err;
977}
978
Ying Xue1b784142015-03-02 15:37:48 +0800979static int l2cap_sock_recvmsg(struct socket *sock, struct msghdr *msg,
980 size_t len, int flags)
Gustavo F. Padovan68983252011-02-04 03:02:31 -0200981{
982 struct sock *sk = sock->sk;
Mat Martineaue3281402011-07-07 09:39:02 -0700983 struct l2cap_pinfo *pi = l2cap_pi(sk);
984 int err;
Gustavo F. Padovan68983252011-02-04 03:02:31 -0200985
986 lock_sock(sk);
987
Gustavo Padovanc5daa682012-05-16 12:17:10 -0300988 if (sk->sk_state == BT_CONNECT2 && test_bit(BT_SK_DEFER_SETUP,
989 &bt_sk(sk)->flags)) {
Johan Hedberg38319712013-05-17 12:49:23 +0300990 if (bdaddr_type_is_le(pi->chan->src_type)) {
991 sk->sk_state = BT_CONNECTED;
992 pi->chan->state = BT_CONNECTED;
993 __l2cap_le_connect_rsp_defer(pi->chan);
994 } else {
995 sk->sk_state = BT_CONFIG;
996 pi->chan->state = BT_CONFIG;
997 __l2cap_connect_rsp_defer(pi->chan);
998 }
Gustavo F. Padovan8c1d7872011-04-13 20:23:55 -0300999
Johan Hedberg970871b2013-09-25 13:26:05 +03001000 err = 0;
1001 goto done;
Gustavo F. Padovan68983252011-02-04 03:02:31 -02001002 }
1003
1004 release_sock(sk);
1005
1006 if (sock->type == SOCK_STREAM)
Ying Xue1b784142015-03-02 15:37:48 +08001007 err = bt_sock_stream_recvmsg(sock, msg, len, flags);
Mat Martineaue3281402011-07-07 09:39:02 -07001008 else
Ying Xue1b784142015-03-02 15:37:48 +08001009 err = bt_sock_recvmsg(sock, msg, len, flags);
Gustavo F. Padovan68983252011-02-04 03:02:31 -02001010
Mat Martineaue3281402011-07-07 09:39:02 -07001011 if (pi->chan->mode != L2CAP_MODE_ERTM)
1012 return err;
1013
1014 /* Attempt to put pending rx data in the socket buffer */
1015
1016 lock_sock(sk);
1017
1018 if (!test_bit(CONN_LOCAL_BUSY, &pi->chan->conn_state))
1019 goto done;
1020
1021 if (pi->rx_busy_skb) {
1022 if (!sock_queue_rcv_skb(sk, pi->rx_busy_skb))
1023 pi->rx_busy_skb = NULL;
1024 else
1025 goto done;
1026 }
1027
1028 /* Restore data flow when half of the receive buffer is
1029 * available. This avoids resending large numbers of
1030 * frames.
1031 */
1032 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf >> 1)
1033 l2cap_chan_busy(pi->chan, 0);
1034
1035done:
1036 release_sock(sk);
1037 return err;
Gustavo F. Padovan68983252011-02-04 03:02:31 -02001038}
1039
Gustavo F. Padovan05fc1572011-02-04 03:26:01 -02001040/* Kill socket (only if zapped and orphan)
1041 * Must be called on unlocked socket.
1042 */
Gustavo F. Padovanba3bd0e2011-05-16 18:23:24 -03001043static void l2cap_sock_kill(struct sock *sk)
Gustavo F. Padovan05fc1572011-02-04 03:26:01 -02001044{
1045 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
1046 return;
1047
Andrei Emeltchenkoe05dcc32012-02-17 11:40:56 +02001048 BT_DBG("sk %p state %s", sk, state_to_string(sk->sk_state));
Gustavo F. Padovan05fc1572011-02-04 03:26:01 -02001049
1050 /* Kill poor orphan */
Gustavo F. Padovan6ff5abb2011-04-25 15:10:41 -03001051
Jaganath Kanakkassery4af66c62012-07-13 18:17:55 +05301052 l2cap_chan_put(l2cap_pi(sk)->chan);
Gustavo F. Padovan05fc1572011-02-04 03:26:01 -02001053 sock_set_flag(sk, SOCK_DEAD);
1054 sock_put(sk);
1055}
1056
Dean Jenkinsf65468f2015-06-23 17:59:33 +01001057static int __l2cap_wait_ack(struct sock *sk, struct l2cap_chan *chan)
Gustavo Padovandc253062013-10-15 19:24:49 -03001058{
Gustavo Padovandc253062013-10-15 19:24:49 -03001059 DECLARE_WAITQUEUE(wait, current);
1060 int err = 0;
Dean Jenkinscb02a252015-06-23 17:59:38 +01001061 int timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
Dean Jenkinse432c722015-06-23 17:59:39 +01001062 /* Timeout to prevent infinite loop */
1063 unsigned long timeout = jiffies + L2CAP_WAIT_ACK_TIMEOUT;
Gustavo Padovandc253062013-10-15 19:24:49 -03001064
1065 add_wait_queue(sk_sleep(sk), &wait);
1066 set_current_state(TASK_INTERRUPTIBLE);
Dean Jenkinsf65468f2015-06-23 17:59:33 +01001067 do {
Dean Jenkinse432c722015-06-23 17:59:39 +01001068 BT_DBG("Waiting for %d ACKs, timeout %04d ms",
1069 chan->unacked_frames, time_after(jiffies, timeout) ? 0 :
1070 jiffies_to_msecs(timeout - jiffies));
Dean Jenkins451e4c62015-06-23 17:59:37 +01001071
Gustavo Padovandc253062013-10-15 19:24:49 -03001072 if (!timeo)
Dean Jenkinscb02a252015-06-23 17:59:38 +01001073 timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
Gustavo Padovandc253062013-10-15 19:24:49 -03001074
1075 if (signal_pending(current)) {
1076 err = sock_intr_errno(timeo);
1077 break;
1078 }
1079
1080 release_sock(sk);
1081 timeo = schedule_timeout(timeo);
1082 lock_sock(sk);
1083 set_current_state(TASK_INTERRUPTIBLE);
1084
1085 err = sock_error(sk);
1086 if (err)
1087 break;
Dean Jenkinsf65468f2015-06-23 17:59:33 +01001088
Dean Jenkinse432c722015-06-23 17:59:39 +01001089 if (time_after(jiffies, timeout)) {
1090 err = -ENOLINK;
1091 break;
1092 }
1093
Dean Jenkinsf65468f2015-06-23 17:59:33 +01001094 } while (chan->unacked_frames > 0 &&
1095 chan->state == BT_CONNECTED);
1096
Gustavo Padovandc253062013-10-15 19:24:49 -03001097 set_current_state(TASK_RUNNING);
1098 remove_wait_queue(sk_sleep(sk), &wait);
1099 return err;
1100}
1101
Gustavo F. Padovandcba0db2011-02-04 03:08:36 -02001102static int l2cap_sock_shutdown(struct socket *sock, int how)
1103{
1104 struct sock *sk = sock->sk;
Andrei Emeltchenko7ddb6e02012-02-14 15:12:57 +02001105 struct l2cap_chan *chan;
Andrei Emeltchenko3df91ea2012-02-21 12:54:55 +02001106 struct l2cap_conn *conn;
Gustavo F. Padovandcba0db2011-02-04 03:08:36 -02001107 int err = 0;
1108
1109 BT_DBG("sock %p, sk %p", sock, sk);
1110
1111 if (!sk)
1112 return 0;
1113
Dean Jenkins04ba72e2015-10-14 12:18:46 +02001114 lock_sock(sk);
1115
Dean Jenkinse7456432015-10-14 12:18:45 +02001116 if (sk->sk_shutdown)
1117 goto shutdown_already;
1118
1119 BT_DBG("Handling sock shutdown");
1120
Dean Jenkins2baea852015-06-23 17:59:32 +01001121 /* prevent sk structure from being freed whilst unlocked */
1122 sock_hold(sk);
1123
Andrei Emeltchenko7ddb6e02012-02-14 15:12:57 +02001124 chan = l2cap_pi(sk)->chan;
Dean Jenkins2baea852015-06-23 17:59:32 +01001125 /* prevent chan structure from being freed whilst unlocked */
1126 l2cap_chan_hold(chan);
Andrei Emeltchenko3df91ea2012-02-21 12:54:55 +02001127
Johan Hedberg49d11742014-11-13 14:37:50 +02001128 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1129
Dean Jenkinse7456432015-10-14 12:18:45 +02001130 if (chan->mode == L2CAP_MODE_ERTM &&
1131 chan->unacked_frames > 0 &&
Dean Jenkins9f7378a2015-10-14 12:18:47 +02001132 chan->state == BT_CONNECTED) {
Dean Jenkinse7456432015-10-14 12:18:45 +02001133 err = __l2cap_wait_ack(sk, chan);
Gustavo F. Padovandcba0db2011-02-04 03:08:36 -02001134
Dean Jenkins9f7378a2015-10-14 12:18:47 +02001135 /* After waiting for ACKs, check whether shutdown
1136 * has already been actioned to close the L2CAP
1137 * link such as by l2cap_disconnection_req().
1138 */
1139 if (sk->sk_shutdown)
1140 goto has_shutdown;
1141 }
1142
Dean Jenkinse7456432015-10-14 12:18:45 +02001143 sk->sk_shutdown = SHUTDOWN_MASK;
Dean Jenkinse7456432015-10-14 12:18:45 +02001144 release_sock(sk);
Dean Jenkins04ba72e2015-10-14 12:18:46 +02001145
1146 l2cap_chan_lock(chan);
1147 conn = chan->conn;
1148 if (conn)
1149 /* prevent conn structure from being freed */
1150 l2cap_conn_get(conn);
1151 l2cap_chan_unlock(chan);
1152
1153 if (conn)
1154 /* mutex lock must be taken before l2cap_chan_lock() */
1155 mutex_lock(&conn->chan_lock);
1156
1157 l2cap_chan_lock(chan);
Dean Jenkinse7456432015-10-14 12:18:45 +02001158 l2cap_chan_close(chan, 0);
Dean Jenkins04ba72e2015-10-14 12:18:46 +02001159 l2cap_chan_unlock(chan);
1160
1161 if (conn) {
1162 mutex_unlock(&conn->chan_lock);
1163 l2cap_conn_put(conn);
1164 }
1165
Dean Jenkinse7456432015-10-14 12:18:45 +02001166 lock_sock(sk);
Gustavo F. Padovandcba0db2011-02-04 03:08:36 -02001167
Dean Jenkinse7456432015-10-14 12:18:45 +02001168 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1169 !(current->flags & PF_EXITING))
1170 err = bt_sock_wait_state(sk, BT_CLOSED,
1171 sk->sk_lingertime);
Gustavo F. Padovandcba0db2011-02-04 03:08:36 -02001172
Dean Jenkins9f7378a2015-10-14 12:18:47 +02001173has_shutdown:
Dean Jenkins2baea852015-06-23 17:59:32 +01001174 l2cap_chan_put(chan);
1175 sock_put(sk);
1176
Dean Jenkinse7456432015-10-14 12:18:45 +02001177shutdown_already:
Dean Jenkins04ba72e2015-10-14 12:18:46 +02001178 if (!err && sk->sk_err)
1179 err = -sk->sk_err;
1180
1181 release_sock(sk);
1182
1183 BT_DBG("Sock shutdown complete err: %d", err);
Dean Jenkins451e4c62015-06-23 17:59:37 +01001184
Gustavo F. Padovandcba0db2011-02-04 03:08:36 -02001185 return err;
1186}
1187
Gustavo F. Padovan554f05b2011-02-04 02:36:42 -02001188static int l2cap_sock_release(struct socket *sock)
1189{
1190 struct sock *sk = sock->sk;
1191 int err;
1192
1193 BT_DBG("sock %p, sk %p", sock, sk);
1194
1195 if (!sk)
1196 return 0;
1197
Masatake YAMATO5b28d952012-07-26 01:29:25 +09001198 bt_sock_unlink(&l2cap_sk_list, sk);
1199
Gustavo F. Padovan554f05b2011-02-04 02:36:42 -02001200 err = l2cap_sock_shutdown(sock, 2);
1201
1202 sock_orphan(sk);
1203 l2cap_sock_kill(sk);
1204 return err;
1205}
1206
Andrei Emeltchenkoc0df7f62012-05-27 22:27:52 -03001207static void l2cap_sock_cleanup_listen(struct sock *parent)
1208{
1209 struct sock *sk;
1210
Johan Hedberg49d11742014-11-13 14:37:50 +02001211 BT_DBG("parent %p state %s", parent,
1212 state_to_string(parent->sk_state));
Andrei Emeltchenkoc0df7f62012-05-27 22:27:52 -03001213
1214 /* Close not yet accepted channels */
1215 while ((sk = bt_accept_dequeue(parent, NULL))) {
1216 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1217
Johan Hedberg49d11742014-11-13 14:37:50 +02001218 BT_DBG("child chan %p state %s", chan,
1219 state_to_string(chan->state));
1220
Andrei Emeltchenkoc0df7f62012-05-27 22:27:52 -03001221 l2cap_chan_lock(chan);
1222 __clear_chan_timer(chan);
1223 l2cap_chan_close(chan, ECONNRESET);
1224 l2cap_chan_unlock(chan);
1225
1226 l2cap_sock_kill(sk);
1227 }
1228}
1229
Gustavo Padovan80b98022012-05-27 22:27:51 -03001230static struct l2cap_chan *l2cap_sock_new_connection_cb(struct l2cap_chan *chan)
Gustavo F. Padovan80808e42011-05-16 17:24:37 -03001231{
Gustavo Padovan80b98022012-05-27 22:27:51 -03001232 struct sock *sk, *parent = chan->data;
Gustavo F. Padovan80808e42011-05-16 17:24:37 -03001233
Gustavo Padovan8ffb9292013-10-21 14:21:41 -02001234 lock_sock(parent);
1235
Gustavo Padovan53826692012-05-27 22:27:55 -03001236 /* Check for backlog size */
1237 if (sk_acceptq_is_full(parent)) {
1238 BT_DBG("backlog full %d", parent->sk_ack_backlog);
Jukka Taimisto8a96f3c2014-05-22 10:02:39 +00001239 release_sock(parent);
Gustavo Padovan53826692012-05-27 22:27:55 -03001240 return NULL;
1241 }
1242
Gustavo F. Padovan80808e42011-05-16 17:24:37 -03001243 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP,
Eric W. Biederman11aa9c22015-05-08 21:09:13 -05001244 GFP_ATOMIC, 0);
Jukka Taimisto8a96f3c2014-05-22 10:02:39 +00001245 if (!sk) {
1246 release_sock(parent);
Gustavo F. Padovan80808e42011-05-16 17:24:37 -03001247 return NULL;
Jukka Taimisto8a96f3c2014-05-22 10:02:39 +00001248 }
Gustavo F. Padovan80808e42011-05-16 17:24:37 -03001249
Octavian Purdilad22015a2012-01-22 00:28:34 +02001250 bt_sock_reclassify_lock(sk, BTPROTO_L2CAP);
1251
Gustavo F. Padovan80808e42011-05-16 17:24:37 -03001252 l2cap_sock_init(sk, parent);
1253
Gustavo Padovan644912e2012-10-12 19:35:23 +08001254 bt_accept_enqueue(parent, sk);
1255
Gustavo Padovan8ffb9292013-10-21 14:21:41 -02001256 release_sock(parent);
1257
Gustavo F. Padovan80808e42011-05-16 17:24:37 -03001258 return l2cap_pi(sk)->chan;
1259}
1260
Gustavo Padovan80b98022012-05-27 22:27:51 -03001261static int l2cap_sock_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
Gustavo F. Padovan23070492011-05-16 17:57:22 -03001262{
Gustavo Padovan80b98022012-05-27 22:27:51 -03001263 struct sock *sk = chan->data;
Marcel Holtmann84b34d92013-10-13 11:36:07 -07001264 int err;
Gustavo F. Padovan23070492011-05-16 17:57:22 -03001265
Andrei Emeltchenko6be36552012-02-22 17:11:56 +02001266 lock_sock(sk);
1267
Marcel Holtmann84b34d92013-10-13 11:36:07 -07001268 if (l2cap_pi(sk)->rx_busy_skb) {
Andrei Emeltchenko6be36552012-02-22 17:11:56 +02001269 err = -ENOMEM;
1270 goto done;
1271 }
Mat Martineaue3281402011-07-07 09:39:02 -07001272
1273 err = sock_queue_rcv_skb(sk, skb);
1274
1275 /* For ERTM, handle one skb that doesn't fit into the recv
1276 * buffer. This is important to do because the data frames
1277 * have already been acked, so the skb cannot be discarded.
1278 *
1279 * Notify the l2cap core that the buffer is full, so the
1280 * LOCAL_BUSY state is entered and no more frames are
1281 * acked and reassembled until there is buffer space
1282 * available.
1283 */
Marcel Holtmann84b34d92013-10-13 11:36:07 -07001284 if (err < 0 && chan->mode == L2CAP_MODE_ERTM) {
1285 l2cap_pi(sk)->rx_busy_skb = skb;
1286 l2cap_chan_busy(chan, 1);
Mat Martineaue3281402011-07-07 09:39:02 -07001287 err = 0;
1288 }
1289
Andrei Emeltchenko6be36552012-02-22 17:11:56 +02001290done:
1291 release_sock(sk);
1292
Mat Martineaue3281402011-07-07 09:39:02 -07001293 return err;
Gustavo F. Padovan23070492011-05-16 17:57:22 -03001294}
1295
Gustavo Padovan80b98022012-05-27 22:27:51 -03001296static void l2cap_sock_close_cb(struct l2cap_chan *chan)
Gustavo F. Padovanba3bd0e2011-05-16 18:23:24 -03001297{
Gustavo Padovan80b98022012-05-27 22:27:51 -03001298 struct sock *sk = chan->data;
Gustavo F. Padovanba3bd0e2011-05-16 18:23:24 -03001299
1300 l2cap_sock_kill(sk);
1301}
1302
Andrei Emeltchenkoc0df7f62012-05-27 22:27:52 -03001303static void l2cap_sock_teardown_cb(struct l2cap_chan *chan, int err)
1304{
1305 struct sock *sk = chan->data;
1306 struct sock *parent;
1307
Johan Hedberg49d11742014-11-13 14:37:50 +02001308 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1309
Johan Hedberg3b2ab392014-11-12 22:22:22 +02001310 /* This callback can be called both for server (BT_LISTEN)
1311 * sockets as well as "normal" ones. To avoid lockdep warnings
1312 * with child socket locking (through l2cap_sock_cleanup_listen)
1313 * we need separation into separate nesting levels. The simplest
1314 * way to accomplish this is to inherit the nesting level used
1315 * for the channel.
1316 */
1317 lock_sock_nested(sk, atomic_read(&chan->nesting));
Andrei Emeltchenkoc0df7f62012-05-27 22:27:52 -03001318
1319 parent = bt_sk(sk)->parent;
1320
1321 sock_set_flag(sk, SOCK_ZAPPED);
1322
1323 switch (chan->state) {
1324 case BT_OPEN:
1325 case BT_BOUND:
1326 case BT_CLOSED:
1327 break;
1328 case BT_LISTEN:
1329 l2cap_sock_cleanup_listen(sk);
1330 sk->sk_state = BT_CLOSED;
1331 chan->state = BT_CLOSED;
1332
1333 break;
1334 default:
1335 sk->sk_state = BT_CLOSED;
1336 chan->state = BT_CLOSED;
1337
1338 sk->sk_err = err;
1339
1340 if (parent) {
1341 bt_accept_unlink(sk);
David S. Miller676d2362014-04-11 16:15:36 -04001342 parent->sk_data_ready(parent);
Andrei Emeltchenkoc0df7f62012-05-27 22:27:52 -03001343 } else {
1344 sk->sk_state_change(sk);
1345 }
1346
1347 break;
1348 }
1349
1350 release_sock(sk);
1351}
1352
Gustavo Padovan53f52122013-10-15 19:24:45 -03001353static void l2cap_sock_state_change_cb(struct l2cap_chan *chan, int state,
1354 int err)
Gustavo F. Padovan89bc5002011-06-03 00:19:47 -03001355{
Gustavo Padovan80b98022012-05-27 22:27:51 -03001356 struct sock *sk = chan->data;
Gustavo F. Padovan89bc5002011-06-03 00:19:47 -03001357
1358 sk->sk_state = state;
Gustavo Padovan53f52122013-10-15 19:24:45 -03001359
1360 if (err)
1361 sk->sk_err = err;
Gustavo F. Padovan89bc5002011-06-03 00:19:47 -03001362}
1363
Andrei Emeltchenko2f7719c2012-01-20 14:08:03 +02001364static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan,
Marcel Holtmannd9fbd022014-06-08 11:22:28 +02001365 unsigned long hdr_len,
Gustavo Padovan90338942012-04-06 20:15:47 -03001366 unsigned long len, int nb)
Andrei Emeltchenko2f7719c2012-01-20 14:08:03 +02001367{
Gustavo Padovan0f2c6152013-10-21 14:21:38 -02001368 struct sock *sk = chan->data;
Gustavo Padovan90338942012-04-06 20:15:47 -03001369 struct sk_buff *skb;
1370 int err;
Andrei Emeltchenko2f7719c2012-01-20 14:08:03 +02001371
Mat Martineaua6a55682012-05-04 14:20:31 -07001372 l2cap_chan_unlock(chan);
Marcel Holtmannd9fbd022014-06-08 11:22:28 +02001373 skb = bt_skb_send_alloc(sk, hdr_len + len, nb, &err);
Mat Martineaua6a55682012-05-04 14:20:31 -07001374 l2cap_chan_lock(chan);
1375
Gustavo Padovan90338942012-04-06 20:15:47 -03001376 if (!skb)
1377 return ERR_PTR(err);
1378
Marcel Holtmann8d463212014-06-05 15:22:51 +02001379 skb->priority = sk->sk_priority;
1380
Johan Hedberga4368ff2015-03-30 23:21:01 +03001381 bt_cb(skb)->l2cap.chan = chan;
Gustavo Padovan0e790c62013-10-21 18:22:24 -02001382
Gustavo Padovan90338942012-04-06 20:15:47 -03001383 return skb;
Andrei Emeltchenko2f7719c2012-01-20 14:08:03 +02001384}
1385
Andrei Emeltchenko54a59aa2012-05-27 22:27:53 -03001386static void l2cap_sock_ready_cb(struct l2cap_chan *chan)
1387{
1388 struct sock *sk = chan->data;
1389 struct sock *parent;
1390
1391 lock_sock(sk);
1392
1393 parent = bt_sk(sk)->parent;
1394
1395 BT_DBG("sk %p, parent %p", sk, parent);
1396
1397 sk->sk_state = BT_CONNECTED;
1398 sk->sk_state_change(sk);
1399
1400 if (parent)
David S. Miller676d2362014-04-11 16:15:36 -04001401 parent->sk_data_ready(parent);
Andrei Emeltchenko54a59aa2012-05-27 22:27:53 -03001402
1403 release_sock(sk);
1404}
1405
Gustavo Padovan2dc4e512012-10-12 19:35:24 +08001406static void l2cap_sock_defer_cb(struct l2cap_chan *chan)
1407{
Gustavo Padovanacdcabf2013-10-21 14:21:39 -02001408 struct sock *parent, *sk = chan->data;
Gustavo Padovan2dc4e512012-10-12 19:35:24 +08001409
Gustavo Padovanacdcabf2013-10-21 14:21:39 -02001410 lock_sock(sk);
1411
1412 parent = bt_sk(sk)->parent;
Gustavo Padovan2dc4e512012-10-12 19:35:24 +08001413 if (parent)
David S. Miller676d2362014-04-11 16:15:36 -04001414 parent->sk_data_ready(parent);
Gustavo Padovanacdcabf2013-10-21 14:21:39 -02001415
1416 release_sock(sk);
Gustavo Padovan2dc4e512012-10-12 19:35:24 +08001417}
1418
Marcel Holtmannd97c8992013-10-14 02:53:54 -07001419static void l2cap_sock_resume_cb(struct l2cap_chan *chan)
1420{
1421 struct sock *sk = chan->data;
1422
Johan Hedbergd52deb12014-08-07 22:56:44 +03001423 if (test_and_clear_bit(FLAG_PENDING_SECURITY, &chan->flags)) {
1424 sk->sk_state = BT_CONNECTED;
1425 chan->state = BT_CONNECTED;
1426 }
1427
Marcel Holtmannd97c8992013-10-14 02:53:54 -07001428 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1429 sk->sk_state_change(sk);
1430}
1431
Gustavo Padovan5ec1bbe2013-10-15 19:24:48 -03001432static void l2cap_sock_set_shutdown_cb(struct l2cap_chan *chan)
1433{
1434 struct sock *sk = chan->data;
1435
1436 lock_sock(sk);
1437 sk->sk_shutdown = SHUTDOWN_MASK;
1438 release_sock(sk);
1439}
1440
Gustavo Padovan8d836d72013-10-15 19:24:47 -03001441static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan *chan)
1442{
1443 struct sock *sk = chan->data;
1444
1445 return sk->sk_sndtimeo;
1446}
1447
Johan Hedberg837776f2013-10-15 11:03:18 +03001448static void l2cap_sock_suspend_cb(struct l2cap_chan *chan)
1449{
1450 struct sock *sk = chan->data;
1451
1452 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1453 sk->sk_state_change(sk);
1454}
1455
Marcel Holtmann67f86a42014-06-08 10:05:31 +02001456static const struct l2cap_ops l2cap_chan_ops = {
Jukka Rissanen04988782014-06-18 16:37:07 +03001457 .name = "L2CAP Socket Interface",
1458 .new_connection = l2cap_sock_new_connection_cb,
1459 .recv = l2cap_sock_recv_cb,
1460 .close = l2cap_sock_close_cb,
1461 .teardown = l2cap_sock_teardown_cb,
1462 .state_change = l2cap_sock_state_change_cb,
1463 .ready = l2cap_sock_ready_cb,
1464 .defer = l2cap_sock_defer_cb,
1465 .resume = l2cap_sock_resume_cb,
1466 .suspend = l2cap_sock_suspend_cb,
1467 .set_shutdown = l2cap_sock_set_shutdown_cb,
1468 .get_sndtimeo = l2cap_sock_get_sndtimeo_cb,
1469 .alloc_skb = l2cap_sock_alloc_skb_cb,
Gustavo F. Padovan80808e42011-05-16 17:24:37 -03001470};
1471
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001472static void l2cap_sock_destruct(struct sock *sk)
1473{
1474 BT_DBG("sk %p", sk);
1475
Sasha Levin23d3a862012-10-08 16:48:32 -04001476 if (l2cap_pi(sk)->chan)
1477 l2cap_chan_put(l2cap_pi(sk)->chan);
Marcel Holtmann84b34d92013-10-13 11:36:07 -07001478
Mat Martineaue3281402011-07-07 09:39:02 -07001479 if (l2cap_pi(sk)->rx_busy_skb) {
1480 kfree_skb(l2cap_pi(sk)->rx_busy_skb);
1481 l2cap_pi(sk)->rx_busy_skb = NULL;
1482 }
1483
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001484 skb_queue_purge(&sk->sk_receive_queue);
1485 skb_queue_purge(&sk->sk_write_queue);
1486}
1487
Marcel Holtmann2edf8702013-10-13 12:55:29 -07001488static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name,
1489 int *msg_namelen)
1490{
Steffen Hurrle342dfc32014-01-17 22:53:15 +01001491 DECLARE_SOCKADDR(struct sockaddr_l2 *, la, msg_name);
Marcel Holtmann2edf8702013-10-13 12:55:29 -07001492
1493 memset(la, 0, sizeof(struct sockaddr_l2));
1494 la->l2_family = AF_BLUETOOTH;
Johan Hedberga4368ff2015-03-30 23:21:01 +03001495 la->l2_psm = bt_cb(skb)->l2cap.psm;
1496 bacpy(&la->l2_bdaddr, &bt_cb(skb)->l2cap.bdaddr);
Marcel Holtmann2edf8702013-10-13 12:55:29 -07001497
1498 *msg_namelen = sizeof(struct sockaddr_l2);
1499}
1500
Gustavo F. Padovan80808e42011-05-16 17:24:37 -03001501static void l2cap_sock_init(struct sock *sk, struct sock *parent)
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001502{
Marcel Holtmann84b34d92013-10-13 11:36:07 -07001503 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001504
1505 BT_DBG("sk %p", sk);
1506
1507 if (parent) {
Gustavo F. Padovanb4450032011-04-12 18:15:09 -03001508 struct l2cap_chan *pchan = l2cap_pi(parent)->chan;
1509
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001510 sk->sk_type = parent->sk_type;
Gustavo Padovanc5daa682012-05-16 12:17:10 -03001511 bt_sk(sk)->flags = bt_sk(parent)->flags;
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001512
Gustavo F. Padovan715ec002011-05-02 17:13:55 -03001513 chan->chan_type = pchan->chan_type;
Gustavo F. Padovan0c1bc5c2011-04-13 17:20:49 -03001514 chan->imtu = pchan->imtu;
1515 chan->omtu = pchan->omtu;
Gustavo F. Padovanb4450032011-04-12 18:15:09 -03001516 chan->conf_state = pchan->conf_state;
Gustavo F. Padovan0c1bc5c2011-04-13 17:20:49 -03001517 chan->mode = pchan->mode;
Gustavo F. Padovan47d1ec62011-04-13 15:57:03 -03001518 chan->fcs = pchan->fcs;
1519 chan->max_tx = pchan->max_tx;
1520 chan->tx_win = pchan->tx_win;
Andrei Emeltchenko6b3c7102011-11-02 09:57:10 +02001521 chan->tx_win_max = pchan->tx_win_max;
Gustavo F. Padovan43434782011-04-12 18:31:57 -03001522 chan->sec_level = pchan->sec_level;
Andrei Emeltchenkod57b0e82011-10-11 14:04:31 +03001523 chan->flags = pchan->flags;
Johan Hedberg0cd75f72013-05-17 13:09:05 +03001524 chan->tx_credits = pchan->tx_credits;
1525 chan->rx_credits = pchan->rx_credits;
Paul Moore6230c9b2011-10-07 09:40:59 +00001526
Johan Hedberg7a8e5a32014-01-25 17:10:09 -05001527 if (chan->chan_type == L2CAP_CHAN_FIXED) {
1528 chan->scid = pchan->scid;
1529 chan->dcid = pchan->scid;
1530 }
1531
Paul Moore6230c9b2011-10-07 09:40:59 +00001532 security_sk_clone(parent, sk);
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001533 } else {
Gustavo F. Padovan715ec002011-05-02 17:13:55 -03001534 switch (sk->sk_type) {
1535 case SOCK_RAW:
1536 chan->chan_type = L2CAP_CHAN_RAW;
1537 break;
1538 case SOCK_DGRAM:
1539 chan->chan_type = L2CAP_CHAN_CONN_LESS;
Marcel Holtmann2edf8702013-10-13 12:55:29 -07001540 bt_sk(sk)->skb_msg_name = l2cap_skb_msg_name;
Gustavo F. Padovan715ec002011-05-02 17:13:55 -03001541 break;
1542 case SOCK_SEQPACKET:
1543 case SOCK_STREAM:
1544 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
1545 break;
1546 }
1547
Gustavo F. Padovan0c1bc5c2011-04-13 17:20:49 -03001548 chan->imtu = L2CAP_DEFAULT_MTU;
1549 chan->omtu = 0;
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001550 if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
Gustavo F. Padovan0c1bc5c2011-04-13 17:20:49 -03001551 chan->mode = L2CAP_MODE_ERTM;
Gustavo F. Padovanc1360a12011-06-10 17:02:12 -03001552 set_bit(CONF_STATE2_DEVICE, &chan->conf_state);
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001553 } else {
Gustavo F. Padovan0c1bc5c2011-04-13 17:20:49 -03001554 chan->mode = L2CAP_MODE_BASIC;
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001555 }
Andrei Emeltchenkobd4b1652012-03-28 16:31:25 +03001556
1557 l2cap_chan_set_defaults(chan);
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001558 }
1559
1560 /* Default config options */
Gustavo F. Padovan0c1bc5c2011-04-13 17:20:49 -03001561 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
Gustavo F. Padovan80808e42011-05-16 17:24:37 -03001562
1563 chan->data = sk;
1564 chan->ops = &l2cap_chan_ops;
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001565}
1566
1567static struct proto l2cap_proto = {
1568 .name = "L2CAP",
1569 .owner = THIS_MODULE,
1570 .obj_size = sizeof(struct l2cap_pinfo)
1571};
1572
Gustavo Padovan2d792812012-10-06 10:07:01 +01001573static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
Eric W. Biederman11aa9c22015-05-08 21:09:13 -05001574 int proto, gfp_t prio, int kern)
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001575{
1576 struct sock *sk;
Gustavo F. Padovandc50a062011-05-16 16:42:01 -03001577 struct l2cap_chan *chan;
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001578
Eric W. Biederman11aa9c22015-05-08 21:09:13 -05001579 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto, kern);
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001580 if (!sk)
1581 return NULL;
1582
1583 sock_init_data(sock, sk);
1584 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
1585
1586 sk->sk_destruct = l2cap_sock_destruct;
Marcel Holtmannba13ccd2012-03-01 14:25:33 -08001587 sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT;
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001588
1589 sock_reset_flag(sk, SOCK_ZAPPED);
1590
1591 sk->sk_protocol = proto;
1592 sk->sk_state = BT_OPEN;
1593
Gustavo Padovaneef1d9b2012-03-25 13:59:16 -03001594 chan = l2cap_chan_create();
Gustavo F. Padovandc50a062011-05-16 16:42:01 -03001595 if (!chan) {
Jaganath Kanakkassery49dfbb92012-07-19 12:54:04 +05301596 sk_free(sk);
Gustavo F. Padovandc50a062011-05-16 16:42:01 -03001597 return NULL;
1598 }
1599
Mat Martineau61d6ef32012-04-27 16:50:50 -07001600 l2cap_chan_hold(chan);
1601
Gustavo F. Padovandc50a062011-05-16 16:42:01 -03001602 l2cap_pi(sk)->chan = chan;
1603
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001604 return sk;
1605}
1606
1607static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
1608 int kern)
1609{
1610 struct sock *sk;
1611
1612 BT_DBG("sock %p", sock);
1613
1614 sock->state = SS_UNCONNECTED;
1615
1616 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
Gustavo Padovan2d792812012-10-06 10:07:01 +01001617 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001618 return -ESOCKTNOSUPPORT;
1619
1620 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
1621 return -EPERM;
1622
1623 sock->ops = &l2cap_sock_ops;
1624
Eric W. Biederman11aa9c22015-05-08 21:09:13 -05001625 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001626 if (!sk)
1627 return -ENOMEM;
1628
1629 l2cap_sock_init(sk, NULL);
Masatake YAMATO5b28d952012-07-26 01:29:25 +09001630 bt_sock_link(&l2cap_sk_list, sk);
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001631 return 0;
1632}
1633
Gustavo F. Padovancf2f90f2011-04-27 18:40:39 -03001634static const struct proto_ops l2cap_sock_ops = {
Gustavo F. Padovan65390582011-02-04 02:33:56 -02001635 .family = PF_BLUETOOTH,
1636 .owner = THIS_MODULE,
1637 .release = l2cap_sock_release,
1638 .bind = l2cap_sock_bind,
1639 .connect = l2cap_sock_connect,
1640 .listen = l2cap_sock_listen,
1641 .accept = l2cap_sock_accept,
1642 .getname = l2cap_sock_getname,
1643 .sendmsg = l2cap_sock_sendmsg,
1644 .recvmsg = l2cap_sock_recvmsg,
1645 .poll = bt_sock_poll,
1646 .ioctl = bt_sock_ioctl,
1647 .mmap = sock_no_mmap,
1648 .socketpair = sock_no_socketpair,
1649 .shutdown = l2cap_sock_shutdown,
1650 .setsockopt = l2cap_sock_setsockopt,
1651 .getsockopt = l2cap_sock_getsockopt
1652};
1653
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001654static const struct net_proto_family l2cap_sock_family_ops = {
1655 .family = PF_BLUETOOTH,
1656 .owner = THIS_MODULE,
1657 .create = l2cap_sock_create,
1658};
1659
1660int __init l2cap_init_sockets(void)
1661{
Gustavo F. Padovane2174ca2011-02-17 19:16:55 -03001662 int err;
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001663
Marcel Holtmanndd625552015-01-11 15:18:19 -08001664 BUILD_BUG_ON(sizeof(struct sockaddr_l2) > sizeof(struct sockaddr));
1665
Gustavo F. Padovane2174ca2011-02-17 19:16:55 -03001666 err = proto_register(&l2cap_proto, 0);
1667 if (err < 0)
1668 return err;
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001669
Gustavo F. Padovane2174ca2011-02-17 19:16:55 -03001670 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
Masatake YAMATO5b28d952012-07-26 01:29:25 +09001671 if (err < 0) {
1672 BT_ERR("L2CAP socket registration failed");
Gustavo F. Padovane2174ca2011-02-17 19:16:55 -03001673 goto error;
Masatake YAMATO5b28d952012-07-26 01:29:25 +09001674 }
1675
Al Virob0316612013-04-04 19:14:33 -04001676 err = bt_procfs_init(&init_net, "l2cap", &l2cap_sk_list,
Gustavo Padovan2d792812012-10-06 10:07:01 +01001677 NULL);
Masatake YAMATO5b28d952012-07-26 01:29:25 +09001678 if (err < 0) {
1679 BT_ERR("Failed to create L2CAP proc file");
1680 bt_sock_unregister(BTPROTO_L2CAP);
1681 goto error;
1682 }
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001683
Gustavo F. Padovane2174ca2011-02-17 19:16:55 -03001684 BT_INFO("L2CAP socket layer initialized");
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001685
Gustavo F. Padovane2174ca2011-02-17 19:16:55 -03001686 return 0;
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001687
1688error:
Gustavo F. Padovane2174ca2011-02-17 19:16:55 -03001689 proto_unregister(&l2cap_proto);
1690 return err;
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001691}
1692
1693void l2cap_cleanup_sockets(void)
1694{
Masatake YAMATO5b28d952012-07-26 01:29:25 +09001695 bt_procfs_cleanup(&init_net, "l2cap");
David Herrmann5e9d7f82013-02-24 19:36:51 +01001696 bt_sock_unregister(BTPROTO_L2CAP);
Gustavo F. Padovane2174ca2011-02-17 19:16:55 -03001697 proto_unregister(&l2cap_proto);
Gustavo F. Padovanbb58f742011-02-03 20:50:35 -02001698}