[deliverable/linux.git] / net / bluetooth / l2cap_sock.c

/*
   BlueZ - Bluetooth protocol stack for Linux
   Copyright (C) 2000-2001 Qualcomm Incorporated
   Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
   Copyright (C) 2010 Google Inc.

   Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 2 as
   published by the Free Software Foundation;

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
   IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
   CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

   ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
   COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
   SOFTWARE IS DISCLAIMED.
*/

/* Bluetooth L2CAP sockets. */

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/l2cap.h>

static void l2cap_sock_timeout(unsigned long arg)
{
	struct sock *sk = (struct sock *) arg;
	int reason;

	BT_DBG("sock %p state %d", sk, sk->sk_state);

	bh_lock_sock(sk);

	if (sock_owned_by_user(sk)) {
		/* sk is owned by user. Try again later */
		l2cap_sock_set_timer(sk, HZ / 5);
		bh_unlock_sock(sk);
		sock_put(sk);
		return;
	}

	if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG)
		reason = ECONNREFUSED;
	else if (sk->sk_state == BT_CONNECT &&
				l2cap_pi(sk)->sec_level != BT_SECURITY_SDP)
		reason = ECONNREFUSED;
	else
		reason = ETIMEDOUT;

	__l2cap_sock_close(sk, reason);

	bh_unlock_sock(sk);

	l2cap_sock_kill(sk);
	sock_put(sk);
}

static int l2cap_sock_release(struct socket *sock)
{
	struct sock *sk = sock->sk;
	int err;

	BT_DBG("sock %p, sk %p", sock, sk);

	if (!sk)
		return 0;

	err = l2cap_sock_shutdown(sock, 2);

	sock_orphan(sk);
	l2cap_sock_kill(sk);
	return err;
}

static void l2cap_sock_destruct(struct sock *sk)
{
	BT_DBG("sk %p", sk);

	skb_queue_purge(&sk->sk_receive_queue);
	skb_queue_purge(&sk->sk_write_queue);
}

void l2cap_sock_init(struct sock *sk, struct sock *parent)
{
	struct l2cap_pinfo *pi = l2cap_pi(sk);

	BT_DBG("sk %p", sk);

	if (parent) {
		sk->sk_type = parent->sk_type;
		bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup;

		pi->imtu = l2cap_pi(parent)->imtu;
		pi->omtu = l2cap_pi(parent)->omtu;
		pi->conf_state = l2cap_pi(parent)->conf_state;
		pi->mode = l2cap_pi(parent)->mode;
		pi->fcs  = l2cap_pi(parent)->fcs;
		pi->max_tx = l2cap_pi(parent)->max_tx;
		pi->tx_win = l2cap_pi(parent)->tx_win;
		pi->sec_level = l2cap_pi(parent)->sec_level;
		pi->role_switch = l2cap_pi(parent)->role_switch;
		pi->force_reliable = l2cap_pi(parent)->force_reliable;
		pi->flushable = l2cap_pi(parent)->flushable;
	} else {
		pi->imtu = L2CAP_DEFAULT_MTU;
		pi->omtu = 0;
		if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
			pi->mode = L2CAP_MODE_ERTM;
			pi->conf_state |= L2CAP_CONF_STATE2_DEVICE;
		} else {
			pi->mode = L2CAP_MODE_BASIC;
		}
		pi->max_tx = L2CAP_DEFAULT_MAX_TX;
		pi->fcs  = L2CAP_FCS_CRC16;
		pi->tx_win = L2CAP_DEFAULT_TX_WINDOW;
		pi->sec_level = BT_SECURITY_LOW;
		pi->role_switch = 0;
		pi->force_reliable = 0;
		pi->flushable = BT_FLUSHABLE_OFF;
	}

	/* Default config options */
	pi->conf_len = 0;
	pi->flush_to = L2CAP_DEFAULT_FLUSH_TO;
	skb_queue_head_init(TX_QUEUE(sk));
	skb_queue_head_init(SREJ_QUEUE(sk));
	skb_queue_head_init(BUSY_QUEUE(sk));
	INIT_LIST_HEAD(SREJ_LIST(sk));
}

static struct proto l2cap_proto = {
	.name		= "L2CAP",
	.owner		= THIS_MODULE,
	.obj_size	= sizeof(struct l2cap_pinfo)
};

struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
{
	struct sock *sk;

	sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
	if (!sk)
		return NULL;

	sock_init_data(sock, sk);
	INIT_LIST_HEAD(&bt_sk(sk)->accept_q);

	sk->sk_destruct = l2cap_sock_destruct;
	sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT);

	sock_reset_flag(sk, SOCK_ZAPPED);

	sk->sk_protocol = proto;
	sk->sk_state = BT_OPEN;

	setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk);

	bt_sock_link(&l2cap_sk_list, sk);
	return sk;
}

static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
			     int kern)
{
	struct sock *sk;

	BT_DBG("sock %p", sock);

	sock->state = SS_UNCONNECTED;

	if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
			sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
		return -ESOCKTNOSUPPORT;

	if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
		return -EPERM;

	sock->ops = &l2cap_sock_ops;

	sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
	if (!sk)
		return -ENOMEM;

	l2cap_sock_init(sk, NULL);
	return 0;
}

const struct proto_ops l2cap_sock_ops = {
	.family		= PF_BLUETOOTH,
	.owner		= THIS_MODULE,
	.release	= l2cap_sock_release,
	.bind		= l2cap_sock_bind,
	.connect	= l2cap_sock_connect,
	.listen		= l2cap_sock_listen,
	.accept		= l2cap_sock_accept,
	.getname	= l2cap_sock_getname,
	.sendmsg	= l2cap_sock_sendmsg,
	.recvmsg	= l2cap_sock_recvmsg,
	.poll		= bt_sock_poll,
	.ioctl		= bt_sock_ioctl,
	.mmap		= sock_no_mmap,
	.socketpair	= sock_no_socketpair,
	.shutdown	= l2cap_sock_shutdown,
	.setsockopt	= l2cap_sock_setsockopt,
	.getsockopt	= l2cap_sock_getsockopt
};

static const struct net_proto_family l2cap_sock_family_ops = {
	.family	= PF_BLUETOOTH,
	.owner	= THIS_MODULE,
	.create	= l2cap_sock_create,
};

int __init l2cap_init_sockets(void)
{
       int err;

       err = proto_register(&l2cap_proto, 0);
       if (err < 0)
               return err;

       err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
       if (err < 0)
               goto error;

       BT_INFO("L2CAP socket layer initialized");

       return 0;

error:
       BT_ERR("L2CAP socket registration failed");
       proto_unregister(&l2cap_proto);
       return err;
}

void l2cap_cleanup_sockets(void)
{
       if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
               BT_ERR("L2CAP socket unregistration failed");

       proto_unregister(&l2cap_proto);
}
Commit	Line	Data
bb58f747 GP	1	/*
	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.
	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
	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.
	21
	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.
	25	*/
	26
	27	/* Bluetooth L2CAP sockets. */
	28
	29	#include <net/bluetooth/bluetooth.h>
	30	#include <net/bluetooth/l2cap.h>
	31
	32	static void l2cap_sock_timeout(unsigned long arg)
	33	{
	34	struct sock sk = (struct sock ) arg;
	35	int reason;
	36
	37	BT_DBG("sock %p state %d", sk, sk->sk_state);
	38
	39	bh_lock_sock(sk);
	40
	41	if (sock_owned_by_user(sk)) {
	42	/* sk is owned by user. Try again later */
	43	l2cap_sock_set_timer(sk, HZ / 5);
	44	bh_unlock_sock(sk);
	45	sock_put(sk);
	46	return;
	47	}
	48
	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;
	54	else
	55	reason = ETIMEDOUT;
	56
	57	__l2cap_sock_close(sk, reason);
	58
	59	bh_unlock_sock(sk);
	60
	61	l2cap_sock_kill(sk);
	62	sock_put(sk);
	63	}
	64
554f05bb GP	65	static int l2cap_sock_release(struct socket *sock)
	66	{
	67	struct sock *sk = sock->sk;
	68	int err;
	69
	70	BT_DBG("sock %p, sk %p", sock, sk);
	71
	72	if (!sk)
	73	return 0;
	74
	75	err = l2cap_sock_shutdown(sock, 2);
	76
	77	sock_orphan(sk);
	78	l2cap_sock_kill(sk);
	79	return err;
	80	}
	81
bb58f747 GP	82	static void l2cap_sock_destruct(struct sock *sk)
	83	{
	84	BT_DBG("sk %p", sk);
	85
	86	skb_queue_purge(&sk->sk_receive_queue);
	87	skb_queue_purge(&sk->sk_write_queue);
	88	}
	89
	90	void l2cap_sock_init(struct sock sk, struct sock parent)
	91	{
	92	struct l2cap_pinfo *pi = l2cap_pi(sk);
	93
	94	BT_DBG("sk %p", sk);
	95
	96	if (parent) {
	97	sk->sk_type = parent->sk_type;
	98	bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup;
	99
	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;
	111	} else {
	112	pi->imtu = L2CAP_DEFAULT_MTU;
	113	pi->omtu = 0;
	114	if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
	115	pi->mode = L2CAP_MODE_ERTM;
	116	pi->conf_state \|= L2CAP_CONF_STATE2_DEVICE;
	117	} else {
	118	pi->mode = L2CAP_MODE_BASIC;
	119	}
	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;
	124	pi->role_switch = 0;
	125	pi->force_reliable = 0;
	126	pi->flushable = BT_FLUSHABLE_OFF;
	127	}
	128
	129	/* Default config options */
	130	pi->conf_len = 0;
	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));
	136	}
	137
	138	static struct proto l2cap_proto = {
	139	.name = "L2CAP",
	140	.owner = THIS_MODULE,
	141	.obj_size = sizeof(struct l2cap_pinfo)
	142	};
	143
	144	struct sock l2cap_sock_alloc(struct net net, struct socket *sock, int proto, gfp_t prio)
	145	{
146	struct sock *sk;
147
148	sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
149	if (!sk)
150	return NULL;
151
152	sock_init_data(sock, sk);
153	INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
154
155	sk->sk_destruct = l2cap_sock_destruct;
156	sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT);
157
158	sock_reset_flag(sk, SOCK_ZAPPED);
159
160	sk->sk_protocol = proto;
161	sk->sk_state = BT_OPEN;
162
163	setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk);
164
165	bt_sock_link(&l2cap_sk_list, sk);
166	return sk;
167	}
168
169	static int l2cap_sock_create(struct net net, struct socket sock, int protocol,
170	int kern)
171	{
172	struct sock *sk;
173
174	BT_DBG("sock %p", sock);
175
176	sock->state = SS_UNCONNECTED;
177
178	if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
179	sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
180	return -ESOCKTNOSUPPORT;
181
182	if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
183	return -EPERM;
184
185	sock->ops = &l2cap_sock_ops;
186
187	sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
188	if (!sk)
189	return -ENOMEM;
190
191	l2cap_sock_init(sk, NULL);
192	return 0;
193	}
194
65390587 GP	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
	213	};
	214
bb58f747 GP	215	static const struct net_proto_family l2cap_sock_family_ops = {
	216	.family = PF_BLUETOOTH,
	217	.owner = THIS_MODULE,
	218	.create = l2cap_sock_create,
	219	};
	220
	221	int __init l2cap_init_sockets(void)
	222	{
	223	int err;
	224
	225	err = proto_register(&l2cap_proto, 0);
	226	if (err < 0)
	227	return err;
	228
	229	err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
	230	if (err < 0)
	231	goto error;
	232
	233	BT_INFO("L2CAP socket layer initialized");
	234
	235	return 0;
	236
	237	error:
	238	BT_ERR("L2CAP socket registration failed");
	239	proto_unregister(&l2cap_proto);
	240	return err;
	241	}
	242
	243	void l2cap_cleanup_sockets(void)
	244	{
	245	if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
	246	BT_ERR("L2CAP socket unregistration failed");
	247
	248	proto_unregister(&l2cap_proto);
	249	}