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.
7 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
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;
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
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
20 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
23 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
24 SOFTWARE IS DISCLAIMED.
27 /* Bluetooth L2CAP sockets. */
29 #include <net/bluetooth/bluetooth.h>
30 #include <net/bluetooth/l2cap.h>
32 static void l2cap_sock_timeout(unsigned long arg)
34 struct sock *sk = (struct sock *) arg;
37 BT_DBG("sock %p state %d", sk, sk->sk_state);
41 if (sock_owned_by_user(sk)) {
42 /* sk is owned by user. Try again later */
43 l2cap_sock_set_timer(sk, HZ / 5);
49 if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG)
50 reason = ECONNREFUSED;
51 else if (sk->sk_state == BT_CONNECT &&
52 l2cap_pi(sk)->sec_level != BT_SECURITY_SDP)
53 reason = ECONNREFUSED;
57 __l2cap_sock_close(sk, reason);
65 static int l2cap_sock_release(struct socket *sock)
67 struct sock *sk = sock->sk;
70 BT_DBG("sock %p, sk %p", sock, sk);
75 err = l2cap_sock_shutdown(sock, 2);
82 static void l2cap_sock_destruct(struct sock *sk)
86 skb_queue_purge(&sk->sk_receive_queue);
87 skb_queue_purge(&sk->sk_write_queue);
90 void l2cap_sock_init(struct sock *sk, struct sock *parent)
92 struct l2cap_pinfo *pi = l2cap_pi(sk);
97 sk->sk_type = parent->sk_type;
98 bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup;
100 pi->imtu = l2cap_pi(parent)->imtu;
101 pi->omtu = l2cap_pi(parent)->omtu;
102 pi->conf_state = l2cap_pi(parent)->conf_state;
103 pi->mode = l2cap_pi(parent)->mode;
104 pi->fcs = l2cap_pi(parent)->fcs;
105 pi->max_tx = l2cap_pi(parent)->max_tx;
106 pi->tx_win = l2cap_pi(parent)->tx_win;
107 pi->sec_level = l2cap_pi(parent)->sec_level;
108 pi->role_switch = l2cap_pi(parent)->role_switch;
109 pi->force_reliable = l2cap_pi(parent)->force_reliable;
110 pi->flushable = l2cap_pi(parent)->flushable;
112 pi->imtu = L2CAP_DEFAULT_MTU;
114 if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
115 pi->mode = L2CAP_MODE_ERTM;
116 pi->conf_state |= L2CAP_CONF_STATE2_DEVICE;
118 pi->mode = L2CAP_MODE_BASIC;
120 pi->max_tx = L2CAP_DEFAULT_MAX_TX;
121 pi->fcs = L2CAP_FCS_CRC16;
122 pi->tx_win = L2CAP_DEFAULT_TX_WINDOW;
123 pi->sec_level = BT_SECURITY_LOW;
125 pi->force_reliable = 0;
126 pi->flushable = BT_FLUSHABLE_OFF;
129 /* Default config options */
131 pi->flush_to = L2CAP_DEFAULT_FLUSH_TO;
132 skb_queue_head_init(TX_QUEUE(sk));
133 skb_queue_head_init(SREJ_QUEUE(sk));
134 skb_queue_head_init(BUSY_QUEUE(sk));
135 INIT_LIST_HEAD(SREJ_LIST(sk));
138 static struct proto l2cap_proto = {
140 .owner = THIS_MODULE,
141 .obj_size = sizeof(struct l2cap_pinfo)
144 struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
148 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
152 sock_init_data(sock, sk);
153 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
155 sk->sk_destruct = l2cap_sock_destruct;
156 sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT);
158 sock_reset_flag(sk, SOCK_ZAPPED);
160 sk->sk_protocol = proto;
161 sk->sk_state = BT_OPEN;
163 setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk);
165 bt_sock_link(&l2cap_sk_list, sk);
169 static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
174 BT_DBG("sock %p", sock);
176 sock->state = SS_UNCONNECTED;
178 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
179 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
180 return -ESOCKTNOSUPPORT;
182 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
185 sock->ops = &l2cap_sock_ops;
187 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
191 l2cap_sock_init(sk, NULL);
195 const struct proto_ops l2cap_sock_ops = {
196 .family = PF_BLUETOOTH,
197 .owner = THIS_MODULE,
198 .release = l2cap_sock_release,
199 .bind = l2cap_sock_bind,
200 .connect = l2cap_sock_connect,
201 .listen = l2cap_sock_listen,
202 .accept = l2cap_sock_accept,
203 .getname = l2cap_sock_getname,
204 .sendmsg = l2cap_sock_sendmsg,
205 .recvmsg = l2cap_sock_recvmsg,
206 .poll = bt_sock_poll,
207 .ioctl = bt_sock_ioctl,
208 .mmap = sock_no_mmap,
209 .socketpair = sock_no_socketpair,
210 .shutdown = l2cap_sock_shutdown,
211 .setsockopt = l2cap_sock_setsockopt,
212 .getsockopt = l2cap_sock_getsockopt
215 static const struct net_proto_family l2cap_sock_family_ops = {
216 .family = PF_BLUETOOTH,
217 .owner = THIS_MODULE,
218 .create = l2cap_sock_create,
221 int __init l2cap_init_sockets(void)
225 err = proto_register(&l2cap_proto, 0);
229 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
233 BT_INFO("L2CAP socket layer initialized");
238 BT_ERR("L2CAP socket registration failed");
239 proto_unregister(&l2cap_proto);
243 void l2cap_cleanup_sockets(void)
245 if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
246 BT_ERR("L2CAP socket unregistration failed");
248 proto_unregister(&l2cap_proto);