[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 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
bb58f747 GP	65	static void l2cap_sock_destruct(struct sock *sk)
	66	{
	67	BT_DBG("sk %p", sk);
	68
	69	skb_queue_purge(&sk->sk_receive_queue);
	70	skb_queue_purge(&sk->sk_write_queue);
	71	}
	72
	73	void l2cap_sock_init(struct sock sk, struct sock parent)
	74	{
	75	struct l2cap_pinfo *pi = l2cap_pi(sk);
	76
	77	BT_DBG("sk %p", sk);
	78
	79	if (parent) {
	80	sk->sk_type = parent->sk_type;
	81	bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup;
	82
	83	pi->imtu = l2cap_pi(parent)->imtu;
	84	pi->omtu = l2cap_pi(parent)->omtu;
	85	pi->conf_state = l2cap_pi(parent)->conf_state;
	86	pi->mode = l2cap_pi(parent)->mode;
	87	pi->fcs = l2cap_pi(parent)->fcs;
	88	pi->max_tx = l2cap_pi(parent)->max_tx;
	89	pi->tx_win = l2cap_pi(parent)->tx_win;
	90	pi->sec_level = l2cap_pi(parent)->sec_level;
	91	pi->role_switch = l2cap_pi(parent)->role_switch;
	92	pi->force_reliable = l2cap_pi(parent)->force_reliable;
	93	pi->flushable = l2cap_pi(parent)->flushable;
	94	} else {
	95	pi->imtu = L2CAP_DEFAULT_MTU;
	96	pi->omtu = 0;
	97	if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
	98	pi->mode = L2CAP_MODE_ERTM;
	99	pi->conf_state \|= L2CAP_CONF_STATE2_DEVICE;
	100	} else {
	101	pi->mode = L2CAP_MODE_BASIC;
	102	}
	103	pi->max_tx = L2CAP_DEFAULT_MAX_TX;
	104	pi->fcs = L2CAP_FCS_CRC16;
	105	pi->tx_win = L2CAP_DEFAULT_TX_WINDOW;
	106	pi->sec_level = BT_SECURITY_LOW;
	107	pi->role_switch = 0;
	108	pi->force_reliable = 0;
	109	pi->flushable = BT_FLUSHABLE_OFF;
	110	}
	111
	112	/* Default config options */
	113	pi->conf_len = 0;
	114	pi->flush_to = L2CAP_DEFAULT_FLUSH_TO;
	115	skb_queue_head_init(TX_QUEUE(sk));
	116	skb_queue_head_init(SREJ_QUEUE(sk));
	117	skb_queue_head_init(BUSY_QUEUE(sk));
	118	INIT_LIST_HEAD(SREJ_LIST(sk));
	119	}
	120
	121	static struct proto l2cap_proto = {
	122	.name = "L2CAP",
	123	.owner = THIS_MODULE,
	124	.obj_size = sizeof(struct l2cap_pinfo)
	125	};
	126
	127	struct sock l2cap_sock_alloc(struct net net, struct socket *sock, int proto, gfp_t prio)
	128	{
129	struct sock *sk;
130
131	sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
132	if (!sk)
133	return NULL;
134
135	sock_init_data(sock, sk);
136	INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
137
138	sk->sk_destruct = l2cap_sock_destruct;
139	sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT);
140
141	sock_reset_flag(sk, SOCK_ZAPPED);
142
143	sk->sk_protocol = proto;
144	sk->sk_state = BT_OPEN;
145
146	setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk);
147
148	bt_sock_link(&l2cap_sk_list, sk);
149	return sk;
150	}
151
152	static int l2cap_sock_create(struct net net, struct socket sock, int protocol,
153	int kern)
154	{
155	struct sock *sk;
156
157	BT_DBG("sock %p", sock);
158
159	sock->state = SS_UNCONNECTED;
160
161	if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
162	sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
163	return -ESOCKTNOSUPPORT;
164
165	if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
166	return -EPERM;
167
168	sock->ops = &l2cap_sock_ops;
169
170	sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
171	if (!sk)
172	return -ENOMEM;
173
174	l2cap_sock_init(sk, NULL);
175	return 0;
176	}
177
65390587 GP	178	const struct proto_ops l2cap_sock_ops = {
	179	.family = PF_BLUETOOTH,
	180	.owner = THIS_MODULE,
	181	.release = l2cap_sock_release,
	182	.bind = l2cap_sock_bind,
	183	.connect = l2cap_sock_connect,
	184	.listen = l2cap_sock_listen,
	185	.accept = l2cap_sock_accept,
	186	.getname = l2cap_sock_getname,
	187	.sendmsg = l2cap_sock_sendmsg,
	188	.recvmsg = l2cap_sock_recvmsg,
	189	.poll = bt_sock_poll,
	190	.ioctl = bt_sock_ioctl,
	191	.mmap = sock_no_mmap,
	192	.socketpair = sock_no_socketpair,
	193	.shutdown = l2cap_sock_shutdown,
	194	.setsockopt = l2cap_sock_setsockopt,
	195	.getsockopt = l2cap_sock_getsockopt
	196	};
	197
bb58f747 GP	198	static const struct net_proto_family l2cap_sock_family_ops = {
	199	.family = PF_BLUETOOTH,
	200	.owner = THIS_MODULE,
	201	.create = l2cap_sock_create,
	202	};
	203
	204	int __init l2cap_init_sockets(void)
	205	{
	206	int err;
	207
	208	err = proto_register(&l2cap_proto, 0);
	209	if (err < 0)
	210	return err;
	211
	212	err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
	213	if (err < 0)
	214	goto error;
	215
	216	BT_INFO("L2CAP socket layer initialized");
	217
	218	return 0;
	219
	220	error:
	221	BT_ERR("L2CAP socket registration failed");
	222	proto_unregister(&l2cap_proto);
	223	return err;
	224	}
	225
	226	void l2cap_cleanup_sockets(void)
	227	{
	228	if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
	229	BT_ERR("L2CAP socket unregistration failed");
	230
	231	proto_unregister(&l2cap_proto);
	232	}