[GitHub/exynos8895/android_kernel_samsung_universal8895.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, see <http://www.gnu.org/licenses/>.
 */

#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 struct nfc_sock_list raw_sk_list = {
	.lock = __RW_LOCK_UNLOCKED(raw_sk_list.lock)
};

static void nfc_sock_link(struct nfc_sock_list *l, struct sock *sk)
{
	write_lock(&l->lock);
	sk_add_node(sk, &l->head);
	write_unlock(&l->lock);
}

static void nfc_sock_unlink(struct nfc_sock_list *l, struct sock *sk)
{
	write_lock(&l->lock);
	sk_del_node_init(sk);
	write_unlock(&l->lock);
}

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 sk=%p\n", sock, sk);

	if (!sk)
		return 0;

	if (sock->type == SOCK_RAW)
		nfc_sock_unlink(&raw_sk_list, sk);

	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_skb;

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

	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_skb:
	kfree_skb(skb);

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 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_from_msg(skb_put(skb, len), msg, 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 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;

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

	rc = skb_copy_datagram_msg(skb, 0, msg, 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 const struct proto_ops rawsock_raw_ops = {
	.family         = PF_NFC,
	.owner          = THIS_MODULE,
	.release        = rawsock_release,
	.bind           = sock_no_bind,
	.connect        = sock_no_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        = sock_no_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_TARGET_MODE_IDLE);
		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, int kern)
{
	struct sock *sk;

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

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

	if (sock->type == SOCK_RAW)
		sock->ops = &rawsock_raw_ops;
	else
		sock->ops = &rawsock_ops;

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

	sock_init_data(sock, sk);
	sk->sk_protocol = nfc_proto->id;
	sk->sk_destruct = rawsock_destruct;
	sock->state = SS_UNCONNECTED;
	if (sock->type == SOCK_RAW)
		nfc_sock_link(&raw_sk_list, sk);
	else {
		INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work);
		nfc_rawsock(sk)->tx_work_scheduled = false;
	}

	return 0;
}

void nfc_send_to_raw_sock(struct nfc_dev *dev, struct sk_buff *skb,
			  u8 payload_type, u8 direction)
{
	struct sk_buff *skb_copy = NULL, *nskb;
	struct sock *sk;
	u8 *data;

	read_lock(&raw_sk_list.lock);

	sk_for_each(sk, &raw_sk_list.head) {
		if (!skb_copy) {
			skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
						      GFP_ATOMIC, true);
			if (!skb_copy)
				continue;

			data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);

			data[0] = dev ? dev->idx : 0xFF;
			data[1] = direction & 0x01;
			data[1] |= (payload_type << 1);
		}

		nskb = skb_clone(skb_copy, GFP_ATOMIC);
		if (!nskb)
			continue;

		if (sock_queue_rcv_skb(sk, nskb))
			kfree_skb(nskb);
	}

	read_unlock(&raw_sk_list.lock);

	kfree_skb(skb_copy);
}
EXPORT_SYMBOL(nfc_send_to_raw_sock);

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
98b32dec	19	* along with this program; if not, see <http://www.gnu.org/licenses/>.
23b7869c LRV	20	*/
23b7869c LRV	21
52858b51	22	#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
ed1e0ad8	23
23b7869c LRV	24	#include <net/tcp_states.h>
23b7869c LRV	25	#include <linux/nfc.h>
bc3b2d7f	26	#include <linux/export.h>
23b7869c LRV	27
	28	#include "nfc.h"
	29
57be1f3f HT	30	static struct nfc_sock_list raw_sk_list = {
	31	.lock = __RW_LOCK_UNLOCKED(raw_sk_list.lock)
	32	};
	33
db3287da	34	static void nfc_sock_link(struct nfc_sock_list l, struct sock sk)
57be1f3f HT	35	{
	36	write_lock(&l->lock);
	37	sk_add_node(sk, &l->head);
	38	write_unlock(&l->lock);
	39	}
	40
db3287da	41	static void nfc_sock_unlink(struct nfc_sock_list l, struct sock sk)
57be1f3f HT	42	{
	43	write_lock(&l->lock);
	44	sk_del_node_init(sk);
	45	write_unlock(&l->lock);
	46	}
	47
23b7869c LRV	48	static void rawsock_write_queue_purge(struct sock *sk)
23b7869c LRV	49	{
20c239c1	50	pr_debug("sk=%p\n", sk);
23b7869c LRV	51
	52	spin_lock_bh(&sk->sk_write_queue.lock);
	53	__skb_queue_purge(&sk->sk_write_queue);
	54	nfc_rawsock(sk)->tx_work_scheduled = false;
	55	spin_unlock_bh(&sk->sk_write_queue.lock);
	56	}
	57
	58	static void rawsock_report_error(struct sock *sk, int err)
	59	{
20c239c1	60	pr_debug("sk=%p err=%d\n", sk, err);
23b7869c LRV	61
	62	sk->sk_shutdown = SHUTDOWN_MASK;
	63	sk->sk_err = -err;
	64	sk->sk_error_report(sk);
	65
	66	rawsock_write_queue_purge(sk);
	67	}
	68
	69	static int rawsock_release(struct socket *sock)
	70	{
	71	struct sock *sk = sock->sk;
	72
03e934f6 ED	73	pr_debug("sock=%p sk=%p\n", sock, sk);
	74
	75	if (!sk)
	76	return 0;
23b7869c	77
57be1f3f HT	78	if (sock->type == SOCK_RAW)
	79	nfc_sock_unlink(&raw_sk_list, sk);
	80
23b7869c LRV	81	sock_orphan(sk);
	82	sock_put(sk);
	83
	84	return 0;
	85	}
	86
	87	static int rawsock_connect(struct socket sock, struct sockaddr _addr,
0a40acb2	88	int len, int flags)
23b7869c LRV	89	{
	90	struct sock *sk = sock->sk;
	91	struct sockaddr_nfc addr = (struct sockaddr_nfc )_addr;
	92	struct nfc_dev *dev;
	93	int rc = 0;
	94
20c239c1	95	pr_debug("sock=%p sk=%p flags=%d\n", sock, sk, flags);
23b7869c LRV	96
23b7869c LRV	97	if (!addr \|\| len < sizeof(struct sockaddr_nfc) \|\|
0a40acb2	98	addr->sa_family != AF_NFC)
23b7869c LRV	99	return -EINVAL;
23b7869c LRV	100
20c239c1 JP	101	pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n",
20c239c1 JP	102	addr->dev_idx, addr->target_idx, addr->nfc_protocol);
23b7869c LRV	103
	104	lock_sock(sk);
	105
	106	if (sock->state == SS_CONNECTED) {
	107	rc = -EISCONN;
	108	goto error;
	109	}
	110
	111	dev = nfc_get_device(addr->dev_idx);
	112	if (!dev) {
	113	rc = -ENODEV;
	114	goto error;
	115	}
	116
01ae0eea EL	117	if (addr->target_idx > dev->target_next_idx - 1 \|\|
01ae0eea EL	118	addr->target_idx < dev->target_next_idx - dev->n_targets) {
c4fbb651 SO	119	rc = -EINVAL;
	120	goto error;
	121	}
	122
23b7869c LRV	123	rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol);
	124	if (rc)
	125	goto put_dev;
	126
	127	nfc_rawsock(sk)->dev = dev;
	128	nfc_rawsock(sk)->target_idx = addr->target_idx;
	129	sock->state = SS_CONNECTED;
	130	sk->sk_state = TCP_ESTABLISHED;
	131	sk->sk_state_change(sk);
	132
	133	release_sock(sk);
	134	return 0;
	135
	136	put_dev:
	137	nfc_put_device(dev);
	138	error:
	139	release_sock(sk);
	140	return rc;
	141	}
	142
	143	static int rawsock_add_header(struct sk_buff *skb)
	144	{
e8753043	145	*skb_push(skb, NFC_HEADER_SIZE) = 0;
23b7869c LRV	146
	147	return 0;
	148	}
	149
	150	static void rawsock_data_exchange_complete(void context, struct sk_buff skb,
0a40acb2	151	int err)
23b7869c LRV	152	{
	153	struct sock sk = (struct sock ) context;
	154
	155	BUG_ON(in_irq());
	156
20c239c1	157	pr_debug("sk=%p err=%d\n", sk, err);
23b7869c LRV	158
	159	if (err)
	160	goto error;
	161
	162	err = rawsock_add_header(skb);
	163	if (err)
4cf7e032	164	goto error_skb;
23b7869c LRV	165
	166	err = sock_queue_rcv_skb(sk, skb);
	167	if (err)
4cf7e032	168	goto error_skb;
23b7869c LRV	169
	170	spin_lock_bh(&sk->sk_write_queue.lock);
	171	if (!skb_queue_empty(&sk->sk_write_queue))
	172	schedule_work(&nfc_rawsock(sk)->tx_work);
	173	else
	174	nfc_rawsock(sk)->tx_work_scheduled = false;
	175	spin_unlock_bh(&sk->sk_write_queue.lock);
	176
	177	sock_put(sk);
	178	return;
	179
4cf7e032 TE	180	error_skb:
	181	kfree_skb(skb);
	182
23b7869c LRV	183	error:
	184	rawsock_report_error(sk, err);
	185	sock_put(sk);
	186	}
	187
	188	static void rawsock_tx_work(struct work_struct *work)
	189	{
	190	struct sock *sk = to_rawsock_sk(work);
	191	struct nfc_dev *dev = nfc_rawsock(sk)->dev;
	192	u32 target_idx = nfc_rawsock(sk)->target_idx;
	193	struct sk_buff *skb;
	194	int rc;
	195
20c239c1	196	pr_debug("sk=%p target_idx=%u\n", sk, target_idx);
23b7869c LRV	197
	198	if (sk->sk_shutdown & SEND_SHUTDOWN) {
	199	rawsock_write_queue_purge(sk);
	200	return;
	201	}
	202
	203	skb = skb_dequeue(&sk->sk_write_queue);
	204
	205	sock_hold(sk);
	206	rc = nfc_data_exchange(dev, target_idx, skb,
0a40acb2	207	rawsock_data_exchange_complete, sk);
23b7869c LRV	208	if (rc) {
	209	rawsock_report_error(sk, rc);
	210	sock_put(sk);
	211	}
	212	}
	213
1b784140	214	static int rawsock_sendmsg(struct socket sock, struct msghdr msg, size_t len)
23b7869c LRV	215	{
23b7869c LRV	216	struct sock *sk = sock->sk;
e8753043	217	struct nfc_dev *dev = nfc_rawsock(sk)->dev;
23b7869c LRV	218	struct sk_buff *skb;
	219	int rc;
	220
20c239c1	221	pr_debug("sock=%p sk=%p len=%zu\n", sock, sk, len);
23b7869c LRV	222
	223	if (msg->msg_namelen)
	224	return -EOPNOTSUPP;
	225
	226	if (sock->state != SS_CONNECTED)
	227	return -ENOTCONN;
	228
7c7cd3bf SO	229	skb = nfc_alloc_send_skb(dev, sk, msg->msg_flags, len, &rc);
7c7cd3bf SO	230	if (skb == NULL)
23b7869c LRV	231	return rc;
23b7869c LRV	232
6ce8e9ce	233	rc = memcpy_from_msg(skb_put(skb, len), msg, len);
23b7869c LRV	234	if (rc < 0) {
	235	kfree_skb(skb);
	236	return rc;
	237	}
	238
	239	spin_lock_bh(&sk->sk_write_queue.lock);
	240	__skb_queue_tail(&sk->sk_write_queue, skb);
	241	if (!nfc_rawsock(sk)->tx_work_scheduled) {
	242	schedule_work(&nfc_rawsock(sk)->tx_work);
	243	nfc_rawsock(sk)->tx_work_scheduled = true;
	244	}
	245	spin_unlock_bh(&sk->sk_write_queue.lock);
	246
	247	return len;
	248	}
	249
1b784140 YX	250	static int rawsock_recvmsg(struct socket sock, struct msghdr msg, size_t len,
1b784140 YX	251	int flags)
23b7869c LRV	252	{
	253	int noblock = flags & MSG_DONTWAIT;
	254	struct sock *sk = sock->sk;
	255	struct sk_buff *skb;
	256	int copied;
	257	int rc;
	258
20c239c1	259	pr_debug("sock=%p sk=%p len=%zu flags=%d\n", sock, sk, len, flags);
23b7869c LRV	260
	261	skb = skb_recv_datagram(sk, flags, noblock, &rc);
	262	if (!skb)
	263	return rc;
	264
23b7869c LRV	265	copied = skb->len;
	266	if (len < copied) {
	267	msg->msg_flags \|= MSG_TRUNC;
	268	copied = len;
	269	}
	270
51f3d02b	271	rc = skb_copy_datagram_msg(skb, 0, msg, copied);
23b7869c LRV	272
	273	skb_free_datagram(sk, skb);
	274
	275	return rc ? : copied;
	276	}
	277
23b7869c LRV	278	static const struct proto_ops rawsock_ops = {
	279	.family = PF_NFC,
	280	.owner = THIS_MODULE,
	281	.release = rawsock_release,
	282	.bind = sock_no_bind,
	283	.connect = rawsock_connect,
	284	.socketpair = sock_no_socketpair,
	285	.accept = sock_no_accept,
	286	.getname = sock_no_getname,
	287	.poll = datagram_poll,
	288	.ioctl = sock_no_ioctl,
	289	.listen = sock_no_listen,
	290	.shutdown = sock_no_shutdown,
	291	.setsockopt = sock_no_setsockopt,
	292	.getsockopt = sock_no_getsockopt,
	293	.sendmsg = rawsock_sendmsg,
	294	.recvmsg = rawsock_recvmsg,
	295	.mmap = sock_no_mmap,
	296	};
	297
57be1f3f HT	298	static const struct proto_ops rawsock_raw_ops = {
	299	.family = PF_NFC,
	300	.owner = THIS_MODULE,
	301	.release = rawsock_release,
	302	.bind = sock_no_bind,
	303	.connect = sock_no_connect,
	304	.socketpair = sock_no_socketpair,
	305	.accept = sock_no_accept,
	306	.getname = sock_no_getname,
	307	.poll = datagram_poll,
	308	.ioctl = sock_no_ioctl,
	309	.listen = sock_no_listen,
	310	.shutdown = sock_no_shutdown,
	311	.setsockopt = sock_no_setsockopt,
	312	.getsockopt = sock_no_getsockopt,
	313	.sendmsg = sock_no_sendmsg,
	314	.recvmsg = rawsock_recvmsg,
	315	.mmap = sock_no_mmap,
	316	};
	317
23b7869c LRV	318	static void rawsock_destruct(struct sock *sk)
23b7869c LRV	319	{
20c239c1	320	pr_debug("sk=%p\n", sk);
23b7869c LRV	321
	322	if (sk->sk_state == TCP_ESTABLISHED) {
	323	nfc_deactivate_target(nfc_rawsock(sk)->dev,
96d4581f CR	324	nfc_rawsock(sk)->target_idx,
96d4581f CR	325	NFC_TARGET_MODE_IDLE);
23b7869c LRV	326	nfc_put_device(nfc_rawsock(sk)->dev);
	327	}
	328
	329	skb_queue_purge(&sk->sk_receive_queue);
	330
	331	if (!sock_flag(sk, SOCK_DEAD)) {
ed1e0ad8	332	pr_err("Freeing alive NFC raw socket %p\n", sk);
23b7869c LRV	333	return;
	334	}
	335	}
	336
	337	static int rawsock_create(struct net net, struct socket sock,
11aa9c28	338	const struct nfc_protocol *nfc_proto, int kern)
23b7869c LRV	339	{
	340	struct sock *sk;
	341
20c239c1	342	pr_debug("sock=%p\n", sock);
23b7869c	343
57be1f3f	344	if ((sock->type != SOCK_SEQPACKET) && (sock->type != SOCK_RAW))
23b7869c LRV	345	return -ESOCKTNOSUPPORT;
23b7869c LRV	346
57be1f3f HT	347	if (sock->type == SOCK_RAW)
	348	sock->ops = &rawsock_raw_ops;
	349	else
	350	sock->ops = &rawsock_ops;
23b7869c	351
11aa9c28	352	sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto, kern);
23b7869c LRV	353	if (!sk)
	354	return -ENOMEM;
	355
	356	sock_init_data(sock, sk);
	357	sk->sk_protocol = nfc_proto->id;
	358	sk->sk_destruct = rawsock_destruct;
	359	sock->state = SS_UNCONNECTED;
57be1f3f HT	360	if (sock->type == SOCK_RAW)
	361	nfc_sock_link(&raw_sk_list, sk);
	362	else {
	363	INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work);
	364	nfc_rawsock(sk)->tx_work_scheduled = false;
	365	}
23b7869c LRV	366
	367	return 0;
	368	}
	369
57be1f3f HT	370	void nfc_send_to_raw_sock(struct nfc_dev dev, struct sk_buff skb,
	371	u8 payload_type, u8 direction)
	372	{
	373	struct sk_buff skb_copy = NULL, nskb;
	374	struct sock *sk;
	375	u8 *data;
	376
	377	read_lock(&raw_sk_list.lock);
	378
	379	sk_for_each(sk, &raw_sk_list.head) {
	380	if (!skb_copy) {
bad93e9d OP	381	skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
bad93e9d OP	382	GFP_ATOMIC, true);
57be1f3f HT	383	if (!skb_copy)
	384	continue;
	385
	386	data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
	387
	388	data[0] = dev ? dev->idx : 0xFF;
	389	data[1] = direction & 0x01;
	390	data[1] \|= (payload_type << 1);
	391	}
	392
	393	nskb = skb_clone(skb_copy, GFP_ATOMIC);
	394	if (!nskb)
	395	continue;
	396
	397	if (sock_queue_rcv_skb(sk, nskb))
	398	kfree_skb(nskb);
	399	}
	400
	401	read_unlock(&raw_sk_list.lock);
	402
	403	kfree_skb(skb_copy);
	404	}
	405	EXPORT_SYMBOL(nfc_send_to_raw_sock);
	406
23b7869c LRV	407	static struct proto rawsock_proto = {
	408	.name = "NFC_RAW",
	409	.owner = THIS_MODULE,
	410	.obj_size = sizeof(struct nfc_rawsock),
	411	};
	412
	413	static const struct nfc_protocol rawsock_nfc_proto = {
	414	.id = NFC_SOCKPROTO_RAW,
	415	.proto = &rawsock_proto,
	416	.owner = THIS_MODULE,
	417	.create = rawsock_create
	418	};
	419
	420	int __init rawsock_init(void)
	421	{
	422	int rc;
	423
	424	rc = nfc_proto_register(&rawsock_nfc_proto);
	425
	426	return rc;
	427	}
	428
	429	void rawsock_exit(void)
	430	{
	431	nfc_proto_unregister(&rawsock_nfc_proto);
	432	}