[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / nfc / rawsock.c

/*
 * Copyright (C) 2011 Instituto Nokia de Tecnologia
 *
 * Authors:
 *    Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
 *    Lauro Ramos Venancio <lauro.venancio@openbossa.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the
 * Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__

#include <net/tcp_states.h>
#include <linux/nfc.h>
#include <linux/export.h>

#include "nfc.h"

static void rawsock_write_queue_purge(struct sock *sk)
{
	pr_debug("sk=%p\n", sk);

	spin_lock_bh(&sk->sk_write_queue.lock);
	__skb_queue_purge(&sk->sk_write_queue);
	nfc_rawsock(sk)->tx_work_scheduled = false;
	spin_unlock_bh(&sk->sk_write_queue.lock);
}

static void rawsock_report_error(struct sock *sk, int err)
{
	pr_debug("sk=%p err=%d\n", sk, err);

	sk->sk_shutdown = SHUTDOWN_MASK;
	sk->sk_err = -err;
	sk->sk_error_report(sk);

	rawsock_write_queue_purge(sk);
}

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

	pr_debug("sock=%p\n", sock);

	sock_orphan(sk);
	sock_put(sk);

	return 0;
}

static int rawsock_connect(struct socket *sock, struct sockaddr *_addr,
			   int len, int flags)
{
	struct sock *sk = sock->sk;
	struct sockaddr_nfc *addr = (struct sockaddr_nfc *)_addr;
	struct nfc_dev *dev;
	int rc = 0;

	pr_debug("sock=%p sk=%p flags=%d\n", sock, sk, flags);

	if (!addr || len < sizeof(struct sockaddr_nfc) ||
	    addr->sa_family != AF_NFC)
		return -EINVAL;

	pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n",
		 addr->dev_idx, addr->target_idx, addr->nfc_protocol);

	lock_sock(sk);

	if (sock->state == SS_CONNECTED) {
		rc = -EISCONN;
		goto error;
	}

	dev = nfc_get_device(addr->dev_idx);
	if (!dev) {
		rc = -ENODEV;
		goto error;
	}

	if (addr->target_idx > dev->target_next_idx - 1 ||
	    addr->target_idx < dev->target_next_idx - dev->n_targets) {
		rc = -EINVAL;
		goto error;
	}

	rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol);
	if (rc)
		goto put_dev;

	nfc_rawsock(sk)->dev = dev;
	nfc_rawsock(sk)->target_idx = addr->target_idx;
	sock->state = SS_CONNECTED;
	sk->sk_state = TCP_ESTABLISHED;
	sk->sk_state_change(sk);

	release_sock(sk);
	return 0;

put_dev:
	nfc_put_device(dev);
error:
	release_sock(sk);
	return rc;
}

static int rawsock_add_header(struct sk_buff *skb)
{
	*skb_push(skb, NFC_HEADER_SIZE) = 0;

	return 0;
}

static void rawsock_data_exchange_complete(void *context, struct sk_buff *skb,
					   int err)
{
	struct sock *sk = (struct sock *) context;

	BUG_ON(in_irq());

	pr_debug("sk=%p err=%d\n", sk, err);

	if (err)
		goto error;

	err = rawsock_add_header(skb);
	if (err)
		goto error;

	err = sock_queue_rcv_skb(sk, skb);
	if (err)
		goto error;

	spin_lock_bh(&sk->sk_write_queue.lock);
	if (!skb_queue_empty(&sk->sk_write_queue))
		schedule_work(&nfc_rawsock(sk)->tx_work);
	else
		nfc_rawsock(sk)->tx_work_scheduled = false;
	spin_unlock_bh(&sk->sk_write_queue.lock);

	sock_put(sk);
	return;

error:
	rawsock_report_error(sk, err);
	sock_put(sk);
}

static void rawsock_tx_work(struct work_struct *work)
{
	struct sock *sk = to_rawsock_sk(work);
	struct nfc_dev *dev = nfc_rawsock(sk)->dev;
	u32 target_idx = nfc_rawsock(sk)->target_idx;
	struct sk_buff *skb;
	int rc;

	pr_debug("sk=%p target_idx=%u\n", sk, target_idx);

	if (sk->sk_shutdown & SEND_SHUTDOWN) {
		rawsock_write_queue_purge(sk);
		return;
	}

	skb = skb_dequeue(&sk->sk_write_queue);

	sock_hold(sk);
	rc = nfc_data_exchange(dev, target_idx, skb,
			       rawsock_data_exchange_complete, sk);
	if (rc) {
		rawsock_report_error(sk, rc);
		sock_put(sk);
	}
}

static int rawsock_sendmsg(struct kiocb *iocb, struct socket *sock,
			   struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
	struct nfc_dev *dev = nfc_rawsock(sk)->dev;
	struct sk_buff *skb;
	int rc;

	pr_debug("sock=%p sk=%p len=%zu\n", sock, sk, len);

	if (msg->msg_namelen)
		return -EOPNOTSUPP;

	if (sock->state != SS_CONNECTED)
		return -ENOTCONN;

	skb = nfc_alloc_send_skb(dev, sk, msg->msg_flags, len, &rc);
	if (skb == NULL)
		return rc;

	rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
	if (rc < 0) {
		kfree_skb(skb);
		return rc;
	}

	spin_lock_bh(&sk->sk_write_queue.lock);
	__skb_queue_tail(&sk->sk_write_queue, skb);
	if (!nfc_rawsock(sk)->tx_work_scheduled) {
		schedule_work(&nfc_rawsock(sk)->tx_work);
		nfc_rawsock(sk)->tx_work_scheduled = true;
	}
	spin_unlock_bh(&sk->sk_write_queue.lock);

	return len;
}

static int rawsock_recvmsg(struct kiocb *iocb, struct socket *sock,
			   struct msghdr *msg, size_t len, int flags)
{
	int noblock = flags & MSG_DONTWAIT;
	struct sock *sk = sock->sk;
	struct sk_buff *skb;
	int copied;
	int rc;

	pr_debug("sock=%p sk=%p len=%zu flags=%d\n", sock, sk, len, flags);

	skb = skb_recv_datagram(sk, flags, noblock, &rc);
	if (!skb)
		return rc;

	msg->msg_namelen = 0;

	copied = skb->len;
	if (len < copied) {
		msg->msg_flags |= MSG_TRUNC;
		copied = len;
	}

	rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);

	skb_free_datagram(sk, skb);

	return rc ? : copied;
}


static const struct proto_ops rawsock_ops = {
	.family         = PF_NFC,
	.owner          = THIS_MODULE,
	.release        = rawsock_release,
	.bind           = sock_no_bind,
	.connect        = rawsock_connect,
	.socketpair     = sock_no_socketpair,
	.accept         = sock_no_accept,
	.getname        = sock_no_getname,
	.poll           = datagram_poll,
	.ioctl          = sock_no_ioctl,
	.listen         = sock_no_listen,
	.shutdown       = sock_no_shutdown,
	.setsockopt     = sock_no_setsockopt,
	.getsockopt     = sock_no_getsockopt,
	.sendmsg        = rawsock_sendmsg,
	.recvmsg        = rawsock_recvmsg,
	.mmap           = sock_no_mmap,
};

static void rawsock_destruct(struct sock *sk)
{
	pr_debug("sk=%p\n", sk);

	if (sk->sk_state == TCP_ESTABLISHED) {
		nfc_deactivate_target(nfc_rawsock(sk)->dev,
				      nfc_rawsock(sk)->target_idx);
		nfc_put_device(nfc_rawsock(sk)->dev);
	}

	skb_queue_purge(&sk->sk_receive_queue);

	if (!sock_flag(sk, SOCK_DEAD)) {
		pr_err("Freeing alive NFC raw socket %p\n", sk);
		return;
	}
}

static int rawsock_create(struct net *net, struct socket *sock,
			  const struct nfc_protocol *nfc_proto)
{
	struct sock *sk;

	pr_debug("sock=%p\n", sock);

	if (sock->type != SOCK_SEQPACKET)
		return -ESOCKTNOSUPPORT;

	sock->ops = &rawsock_ops;

	sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto);
	if (!sk)
		return -ENOMEM;

	sock_init_data(sock, sk);
	sk->sk_protocol = nfc_proto->id;
	sk->sk_destruct = rawsock_destruct;
	sock->state = SS_UNCONNECTED;

	INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work);
	nfc_rawsock(sk)->tx_work_scheduled = false;

	return 0;
}

static struct proto rawsock_proto = {
	.name     = "NFC_RAW",
	.owner    = THIS_MODULE,
	.obj_size = sizeof(struct nfc_rawsock),
};

static const struct nfc_protocol rawsock_nfc_proto = {
	.id	  = NFC_SOCKPROTO_RAW,
	.proto    = &rawsock_proto,
	.owner    = THIS_MODULE,
	.create   = rawsock_create
};

int __init rawsock_init(void)
{
	int rc;

	rc = nfc_proto_register(&rawsock_nfc_proto);

	return rc;
}

void rawsock_exit(void)
{
	nfc_proto_unregister(&rawsock_nfc_proto);
}
Commit	Line	Data
23b7869c LRV	1	/*
	2	* Copyright (C) 2011 Instituto Nokia de Tecnologia
	3	*
	4	* Authors:
	5	* Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
	6	* Lauro Ramos Venancio <lauro.venancio@openbossa.org>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the
	20	* Free Software Foundation, Inc.,
	21	* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	22	*/
	23
52858b51	24	#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
ed1e0ad8	25
23b7869c LRV	26	#include <net/tcp_states.h>
23b7869c LRV	27	#include <linux/nfc.h>
bc3b2d7f	28	#include <linux/export.h>
23b7869c LRV	29
	30	#include "nfc.h"
	31
	32	static void rawsock_write_queue_purge(struct sock *sk)
	33	{
20c239c1	34	pr_debug("sk=%p\n", sk);
23b7869c LRV	35
	36	spin_lock_bh(&sk->sk_write_queue.lock);
	37	__skb_queue_purge(&sk->sk_write_queue);
	38	nfc_rawsock(sk)->tx_work_scheduled = false;
	39	spin_unlock_bh(&sk->sk_write_queue.lock);
	40	}
	41
	42	static void rawsock_report_error(struct sock *sk, int err)
	43	{
20c239c1	44	pr_debug("sk=%p err=%d\n", sk, err);
23b7869c LRV	45
	46	sk->sk_shutdown = SHUTDOWN_MASK;
	47	sk->sk_err = -err;
	48	sk->sk_error_report(sk);
	49
	50	rawsock_write_queue_purge(sk);
	51	}
	52
	53	static int rawsock_release(struct socket *sock)
	54	{
	55	struct sock *sk = sock->sk;
	56
20c239c1	57	pr_debug("sock=%p\n", sock);
23b7869c LRV	58
	59	sock_orphan(sk);
	60	sock_put(sk);
	61
	62	return 0;
	63	}
	64
	65	static int rawsock_connect(struct socket sock, struct sockaddr _addr,
0a40acb2	66	int len, int flags)
23b7869c LRV	67	{
	68	struct sock *sk = sock->sk;
	69	struct sockaddr_nfc addr = (struct sockaddr_nfc )_addr;
	70	struct nfc_dev *dev;
	71	int rc = 0;
	72
20c239c1	73	pr_debug("sock=%p sk=%p flags=%d\n", sock, sk, flags);
23b7869c LRV	74
23b7869c LRV	75	if (!addr \|\| len < sizeof(struct sockaddr_nfc) \|\|
0a40acb2	76	addr->sa_family != AF_NFC)
23b7869c LRV	77	return -EINVAL;
23b7869c LRV	78
20c239c1 JP	79	pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n",
20c239c1 JP	80	addr->dev_idx, addr->target_idx, addr->nfc_protocol);
23b7869c LRV	81
	82	lock_sock(sk);
	83
	84	if (sock->state == SS_CONNECTED) {
	85	rc = -EISCONN;
	86	goto error;
	87	}
	88
	89	dev = nfc_get_device(addr->dev_idx);
	90	if (!dev) {
	91	rc = -ENODEV;
	92	goto error;
	93	}
	94
01ae0eea EL	95	if (addr->target_idx > dev->target_next_idx - 1 \|\|
01ae0eea EL	96	addr->target_idx < dev->target_next_idx - dev->n_targets) {
c4fbb651 SO	97	rc = -EINVAL;
	98	goto error;
	99	}
	100
23b7869c LRV	101	rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol);
	102	if (rc)
	103	goto put_dev;
	104
	105	nfc_rawsock(sk)->dev = dev;
	106	nfc_rawsock(sk)->target_idx = addr->target_idx;
	107	sock->state = SS_CONNECTED;
	108	sk->sk_state = TCP_ESTABLISHED;
	109	sk->sk_state_change(sk);
	110
	111	release_sock(sk);
	112	return 0;
	113
	114	put_dev:
	115	nfc_put_device(dev);
	116	error:
	117	release_sock(sk);
	118	return rc;
	119	}
	120
	121	static int rawsock_add_header(struct sk_buff *skb)
	122	{
e8753043	123	*skb_push(skb, NFC_HEADER_SIZE) = 0;
23b7869c LRV	124
	125	return 0;
	126	}
	127
	128	static void rawsock_data_exchange_complete(void context, struct sk_buff skb,
0a40acb2	129	int err)
23b7869c LRV	130	{
	131	struct sock sk = (struct sock ) context;
	132
	133	BUG_ON(in_irq());
	134
20c239c1	135	pr_debug("sk=%p err=%d\n", sk, err);
23b7869c LRV	136
	137	if (err)
	138	goto error;
	139
	140	err = rawsock_add_header(skb);
	141	if (err)
	142	goto error;
	143
	144	err = sock_queue_rcv_skb(sk, skb);
	145	if (err)
	146	goto error;
	147
	148	spin_lock_bh(&sk->sk_write_queue.lock);
	149	if (!skb_queue_empty(&sk->sk_write_queue))
	150	schedule_work(&nfc_rawsock(sk)->tx_work);
	151	else
	152	nfc_rawsock(sk)->tx_work_scheduled = false;
	153	spin_unlock_bh(&sk->sk_write_queue.lock);
	154
	155	sock_put(sk);
	156	return;
	157
	158	error:
	159	rawsock_report_error(sk, err);
	160	sock_put(sk);
	161	}
	162
	163	static void rawsock_tx_work(struct work_struct *work)
	164	{
	165	struct sock *sk = to_rawsock_sk(work);
	166	struct nfc_dev *dev = nfc_rawsock(sk)->dev;
	167	u32 target_idx = nfc_rawsock(sk)->target_idx;
	168	struct sk_buff *skb;
	169	int rc;
	170
20c239c1	171	pr_debug("sk=%p target_idx=%u\n", sk, target_idx);
23b7869c LRV	172
	173	if (sk->sk_shutdown & SEND_SHUTDOWN) {
	174	rawsock_write_queue_purge(sk);
	175	return;
	176	}
	177
	178	skb = skb_dequeue(&sk->sk_write_queue);
	179
	180	sock_hold(sk);
	181	rc = nfc_data_exchange(dev, target_idx, skb,
0a40acb2	182	rawsock_data_exchange_complete, sk);
23b7869c LRV	183	if (rc) {
	184	rawsock_report_error(sk, rc);
	185	sock_put(sk);
	186	}
	187	}
	188
	189	static int rawsock_sendmsg(struct kiocb iocb, struct socket sock,
0a40acb2	190	struct msghdr *msg, size_t len)
23b7869c LRV	191	{
23b7869c LRV	192	struct sock *sk = sock->sk;
e8753043	193	struct nfc_dev *dev = nfc_rawsock(sk)->dev;
23b7869c LRV	194	struct sk_buff *skb;
	195	int rc;
	196
20c239c1	197	pr_debug("sock=%p sk=%p len=%zu\n", sock, sk, len);
23b7869c LRV	198
	199	if (msg->msg_namelen)
	200	return -EOPNOTSUPP;
	201
	202	if (sock->state != SS_CONNECTED)
	203	return -ENOTCONN;
	204
7c7cd3bf SO	205	skb = nfc_alloc_send_skb(dev, sk, msg->msg_flags, len, &rc);
7c7cd3bf SO	206	if (skb == NULL)
23b7869c LRV	207	return rc;
	208
	209	rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
	210	if (rc < 0) {
	211	kfree_skb(skb);
	212	return rc;
	213	}
	214
	215	spin_lock_bh(&sk->sk_write_queue.lock);
	216	__skb_queue_tail(&sk->sk_write_queue, skb);
	217	if (!nfc_rawsock(sk)->tx_work_scheduled) {
	218	schedule_work(&nfc_rawsock(sk)->tx_work);
	219	nfc_rawsock(sk)->tx_work_scheduled = true;
	220	}
	221	spin_unlock_bh(&sk->sk_write_queue.lock);
	222
	223	return len;
	224	}
	225
	226	static int rawsock_recvmsg(struct kiocb iocb, struct socket sock,
0a40acb2	227	struct msghdr *msg, size_t len, int flags)
23b7869c LRV	228	{
	229	int noblock = flags & MSG_DONTWAIT;
	230	struct sock *sk = sock->sk;
	231	struct sk_buff *skb;
	232	int copied;
	233	int rc;
	234
20c239c1	235	pr_debug("sock=%p sk=%p len=%zu flags=%d\n", sock, sk, len, flags);
23b7869c LRV	236
	237	skb = skb_recv_datagram(sk, flags, noblock, &rc);
	238	if (!skb)
	239	return rc;
	240
	241	msg->msg_namelen = 0;
	242
	243	copied = skb->len;
	244	if (len < copied) {
	245	msg->msg_flags \|= MSG_TRUNC;
	246	copied = len;
	247	}
	248
	249	rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
	250
	251	skb_free_datagram(sk, skb);
	252
	253	return rc ? : copied;
	254	}
	255
	256
	257	static const struct proto_ops rawsock_ops = {
	258	.family = PF_NFC,
	259	.owner = THIS_MODULE,
	260	.release = rawsock_release,
	261	.bind = sock_no_bind,
	262	.connect = rawsock_connect,
	263	.socketpair = sock_no_socketpair,
	264	.accept = sock_no_accept,
	265	.getname = sock_no_getname,
	266	.poll = datagram_poll,
	267	.ioctl = sock_no_ioctl,
	268	.listen = sock_no_listen,
	269	.shutdown = sock_no_shutdown,
	270	.setsockopt = sock_no_setsockopt,
	271	.getsockopt = sock_no_getsockopt,
	272	.sendmsg = rawsock_sendmsg,
	273	.recvmsg = rawsock_recvmsg,
	274	.mmap = sock_no_mmap,
	275	};
	276
	277	static void rawsock_destruct(struct sock *sk)
	278	{
20c239c1	279	pr_debug("sk=%p\n", sk);
23b7869c LRV	280
	281	if (sk->sk_state == TCP_ESTABLISHED) {
	282	nfc_deactivate_target(nfc_rawsock(sk)->dev,
0a40acb2	283	nfc_rawsock(sk)->target_idx);
23b7869c LRV	284	nfc_put_device(nfc_rawsock(sk)->dev);
	285	}
	286
	287	skb_queue_purge(&sk->sk_receive_queue);
	288
	289	if (!sock_flag(sk, SOCK_DEAD)) {
ed1e0ad8	290	pr_err("Freeing alive NFC raw socket %p\n", sk);
23b7869c LRV	291	return;
	292	}
	293	}
	294
	295	static int rawsock_create(struct net net, struct socket sock,
0a40acb2	296	const struct nfc_protocol *nfc_proto)
23b7869c LRV	297	{
	298	struct sock *sk;
	299
20c239c1	300	pr_debug("sock=%p\n", sock);
23b7869c LRV	301
	302	if (sock->type != SOCK_SEQPACKET)
	303	return -ESOCKTNOSUPPORT;
	304
	305	sock->ops = &rawsock_ops;
	306
db81a624	307	sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto);
23b7869c LRV	308	if (!sk)
	309	return -ENOMEM;
	310
	311	sock_init_data(sock, sk);
	312	sk->sk_protocol = nfc_proto->id;
	313	sk->sk_destruct = rawsock_destruct;
	314	sock->state = SS_UNCONNECTED;
	315
	316	INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work);
	317	nfc_rawsock(sk)->tx_work_scheduled = false;
	318
	319	return 0;
	320	}
	321
	322	static struct proto rawsock_proto = {
	323	.name = "NFC_RAW",
	324	.owner = THIS_MODULE,
	325	.obj_size = sizeof(struct nfc_rawsock),
	326	};
	327
	328	static const struct nfc_protocol rawsock_nfc_proto = {
	329	.id = NFC_SOCKPROTO_RAW,
	330	.proto = &rawsock_proto,
	331	.owner = THIS_MODULE,
	332	.create = rawsock_create
	333	};
	334
	335	int __init rawsock_init(void)
	336	{
	337	int rc;
	338
	339	rc = nfc_proto_register(&rawsock_nfc_proto);
	340
	341	return rc;
	342	}
	343
	344	void rawsock_exit(void)
	345	{
	346	nfc_proto_unregister(&rawsock_nfc_proto);
	347	}