[linux-block.git] / net / nfc / rawsock.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2011 Instituto Nokia de Tecnologia
 *
 * Authors:
 *    Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
 *    Lauro Ramos Venancio <lauro.venancio@openbossa.org>
 */

#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)
{
	*(u8 *)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,
	.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,
	.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
1ccea77e	1	// SPDX-License-Identifier: GPL-2.0-or-later
23b7869c LRV	2	/*
	3	* Copyright (C) 2011 Instituto Nokia de Tecnologia
	4	*
	5	* Authors:
	6	* Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
	7	* Lauro Ramos Venancio <lauro.venancio@openbossa.org>
23b7869c LRV	8	*/
23b7869c LRV	9
52858b51	10	#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
ed1e0ad8	11
23b7869c LRV	12	#include <net/tcp_states.h>
23b7869c LRV	13	#include <linux/nfc.h>
bc3b2d7f	14	#include <linux/export.h>
23b7869c LRV	15
	16	#include "nfc.h"
	17
57be1f3f HT	18	static struct nfc_sock_list raw_sk_list = {
	19	.lock = __RW_LOCK_UNLOCKED(raw_sk_list.lock)
	20	};
	21
db3287da	22	static void nfc_sock_link(struct nfc_sock_list l, struct sock sk)
57be1f3f HT	23	{
	24	write_lock(&l->lock);
	25	sk_add_node(sk, &l->head);
	26	write_unlock(&l->lock);
	27	}
	28
db3287da	29	static void nfc_sock_unlink(struct nfc_sock_list l, struct sock sk)
57be1f3f HT	30	{
	31	write_lock(&l->lock);
	32	sk_del_node_init(sk);
	33	write_unlock(&l->lock);
	34	}
	35
23b7869c LRV	36	static void rawsock_write_queue_purge(struct sock *sk)
23b7869c LRV	37	{
20c239c1	38	pr_debug("sk=%p\n", sk);
23b7869c LRV	39
	40	spin_lock_bh(&sk->sk_write_queue.lock);
	41	__skb_queue_purge(&sk->sk_write_queue);
	42	nfc_rawsock(sk)->tx_work_scheduled = false;
	43	spin_unlock_bh(&sk->sk_write_queue.lock);
	44	}
	45
	46	static void rawsock_report_error(struct sock *sk, int err)
	47	{
20c239c1	48	pr_debug("sk=%p err=%d\n", sk, err);
23b7869c LRV	49
	50	sk->sk_shutdown = SHUTDOWN_MASK;
	51	sk->sk_err = -err;
	52	sk->sk_error_report(sk);
	53
	54	rawsock_write_queue_purge(sk);
	55	}
	56
	57	static int rawsock_release(struct socket *sock)
	58	{
	59	struct sock *sk = sock->sk;
	60
03e934f6 ED	61	pr_debug("sock=%p sk=%p\n", sock, sk);
	62
	63	if (!sk)
	64	return 0;
23b7869c	65
57be1f3f HT	66	if (sock->type == SOCK_RAW)
	67	nfc_sock_unlink(&raw_sk_list, sk);
	68
23b7869c LRV	69	sock_orphan(sk);
	70	sock_put(sk);
	71
	72	return 0;
	73	}
	74
	75	static int rawsock_connect(struct socket sock, struct sockaddr _addr,
0a40acb2	76	int len, int flags)
23b7869c LRV	77	{
	78	struct sock *sk = sock->sk;
	79	struct sockaddr_nfc addr = (struct sockaddr_nfc )_addr;
	80	struct nfc_dev *dev;
	81	int rc = 0;
	82
20c239c1	83	pr_debug("sock=%p sk=%p flags=%d\n", sock, sk, flags);
23b7869c LRV	84
23b7869c LRV	85	if (!addr \|\| len < sizeof(struct sockaddr_nfc) \|\|
0a40acb2	86	addr->sa_family != AF_NFC)
23b7869c LRV	87	return -EINVAL;
23b7869c LRV	88
20c239c1 JP	89	pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n",
20c239c1 JP	90	addr->dev_idx, addr->target_idx, addr->nfc_protocol);
23b7869c LRV	91
	92	lock_sock(sk);
	93
	94	if (sock->state == SS_CONNECTED) {
	95	rc = -EISCONN;
	96	goto error;
	97	}
	98
	99	dev = nfc_get_device(addr->dev_idx);
	100	if (!dev) {
	101	rc = -ENODEV;
	102	goto error;
	103	}
	104
01ae0eea EL	105	if (addr->target_idx > dev->target_next_idx - 1 \|\|
01ae0eea EL	106	addr->target_idx < dev->target_next_idx - dev->n_targets) {
c4fbb651 SO	107	rc = -EINVAL;
	108	goto error;
	109	}
	110
23b7869c LRV	111	rc = nfc_activate_target(dev, addr->target_idx, addr->nfc_protocol);
	112	if (rc)
	113	goto put_dev;
	114
	115	nfc_rawsock(sk)->dev = dev;
	116	nfc_rawsock(sk)->target_idx = addr->target_idx;
	117	sock->state = SS_CONNECTED;
	118	sk->sk_state = TCP_ESTABLISHED;
	119	sk->sk_state_change(sk);
	120
	121	release_sock(sk);
	122	return 0;
	123
	124	put_dev:
	125	nfc_put_device(dev);
	126	error:
	127	release_sock(sk);
	128	return rc;
	129	}
	130
	131	static int rawsock_add_header(struct sk_buff *skb)
	132	{
d58ff351	133	(u8 )skb_push(skb, NFC_HEADER_SIZE) = 0;
23b7869c LRV	134
	135	return 0;
	136	}
	137
	138	static void rawsock_data_exchange_complete(void context, struct sk_buff skb,
0a40acb2	139	int err)
23b7869c LRV	140	{
	141	struct sock sk = (struct sock ) context;
	142
	143	BUG_ON(in_irq());
	144
20c239c1	145	pr_debug("sk=%p err=%d\n", sk, err);
23b7869c LRV	146
	147	if (err)
	148	goto error;
	149
	150	err = rawsock_add_header(skb);
	151	if (err)
4cf7e032	152	goto error_skb;
23b7869c LRV	153
	154	err = sock_queue_rcv_skb(sk, skb);
	155	if (err)
4cf7e032	156	goto error_skb;
23b7869c LRV	157
	158	spin_lock_bh(&sk->sk_write_queue.lock);
	159	if (!skb_queue_empty(&sk->sk_write_queue))
	160	schedule_work(&nfc_rawsock(sk)->tx_work);
	161	else
	162	nfc_rawsock(sk)->tx_work_scheduled = false;
	163	spin_unlock_bh(&sk->sk_write_queue.lock);
	164
	165	sock_put(sk);
	166	return;
	167
4cf7e032 TE	168	error_skb:
	169	kfree_skb(skb);
	170
23b7869c LRV	171	error:
	172	rawsock_report_error(sk, err);
	173	sock_put(sk);
	174	}
	175
	176	static void rawsock_tx_work(struct work_struct *work)
	177	{
	178	struct sock *sk = to_rawsock_sk(work);
	179	struct nfc_dev *dev = nfc_rawsock(sk)->dev;
	180	u32 target_idx = nfc_rawsock(sk)->target_idx;
	181	struct sk_buff *skb;
	182	int rc;
	183
20c239c1	184	pr_debug("sk=%p target_idx=%u\n", sk, target_idx);
23b7869c LRV	185
	186	if (sk->sk_shutdown & SEND_SHUTDOWN) {
	187	rawsock_write_queue_purge(sk);
	188	return;
	189	}
	190
	191	skb = skb_dequeue(&sk->sk_write_queue);
	192
	193	sock_hold(sk);
	194	rc = nfc_data_exchange(dev, target_idx, skb,
0a40acb2	195	rawsock_data_exchange_complete, sk);
23b7869c LRV	196	if (rc) {
	197	rawsock_report_error(sk, rc);
	198	sock_put(sk);
	199	}
	200	}
	201
1b784140	202	static int rawsock_sendmsg(struct socket sock, struct msghdr msg, size_t len)
23b7869c LRV	203	{
23b7869c LRV	204	struct sock *sk = sock->sk;
e8753043	205	struct nfc_dev *dev = nfc_rawsock(sk)->dev;
23b7869c LRV	206	struct sk_buff *skb;
	207	int rc;
	208
20c239c1	209	pr_debug("sock=%p sk=%p len=%zu\n", sock, sk, len);
23b7869c LRV	210
	211	if (msg->msg_namelen)
	212	return -EOPNOTSUPP;
	213
	214	if (sock->state != SS_CONNECTED)
	215	return -ENOTCONN;
	216
7c7cd3bf SO	217	skb = nfc_alloc_send_skb(dev, sk, msg->msg_flags, len, &rc);
7c7cd3bf SO	218	if (skb == NULL)
23b7869c LRV	219	return rc;
23b7869c LRV	220
6ce8e9ce	221	rc = memcpy_from_msg(skb_put(skb, len), msg, len);
23b7869c LRV	222	if (rc < 0) {
	223	kfree_skb(skb);
	224	return rc;
	225	}
	226
	227	spin_lock_bh(&sk->sk_write_queue.lock);
	228	__skb_queue_tail(&sk->sk_write_queue, skb);
	229	if (!nfc_rawsock(sk)->tx_work_scheduled) {
	230	schedule_work(&nfc_rawsock(sk)->tx_work);
	231	nfc_rawsock(sk)->tx_work_scheduled = true;
	232	}
	233	spin_unlock_bh(&sk->sk_write_queue.lock);
	234
	235	return len;
	236	}
	237
1b784140 YX	238	static int rawsock_recvmsg(struct socket sock, struct msghdr msg, size_t len,
1b784140 YX	239	int flags)
23b7869c LRV	240	{
	241	int noblock = flags & MSG_DONTWAIT;
	242	struct sock *sk = sock->sk;
	243	struct sk_buff *skb;
	244	int copied;
	245	int rc;
	246
20c239c1	247	pr_debug("sock=%p sk=%p len=%zu flags=%d\n", sock, sk, len, flags);
23b7869c LRV	248
	249	skb = skb_recv_datagram(sk, flags, noblock, &rc);
	250	if (!skb)
	251	return rc;
	252
23b7869c LRV	253	copied = skb->len;
	254	if (len < copied) {
	255	msg->msg_flags \|= MSG_TRUNC;
	256	copied = len;
	257	}
	258
51f3d02b	259	rc = skb_copy_datagram_msg(skb, 0, msg, copied);
23b7869c LRV	260
	261	skb_free_datagram(sk, skb);
	262
	263	return rc ? : copied;
	264	}
	265
23b7869c LRV	266	static const struct proto_ops rawsock_ops = {
	267	.family = PF_NFC,
	268	.owner = THIS_MODULE,
	269	.release = rawsock_release,
	270	.bind = sock_no_bind,
	271	.connect = rawsock_connect,
	272	.socketpair = sock_no_socketpair,
	273	.accept = sock_no_accept,
	274	.getname = sock_no_getname,
a11e1d43	275	.poll = datagram_poll,
23b7869c LRV	276	.ioctl = sock_no_ioctl,
	277	.listen = sock_no_listen,
	278	.shutdown = sock_no_shutdown,
23b7869c LRV	279	.sendmsg = rawsock_sendmsg,
	280	.recvmsg = rawsock_recvmsg,
	281	.mmap = sock_no_mmap,
	282	};
	283
57be1f3f HT	284	static const struct proto_ops rawsock_raw_ops = {
	285	.family = PF_NFC,
	286	.owner = THIS_MODULE,
	287	.release = rawsock_release,
	288	.bind = sock_no_bind,
	289	.connect = sock_no_connect,
	290	.socketpair = sock_no_socketpair,
	291	.accept = sock_no_accept,
	292	.getname = sock_no_getname,
a11e1d43	293	.poll = datagram_poll,
57be1f3f HT	294	.ioctl = sock_no_ioctl,
	295	.listen = sock_no_listen,
	296	.shutdown = sock_no_shutdown,
57be1f3f HT	297	.sendmsg = sock_no_sendmsg,
	298	.recvmsg = rawsock_recvmsg,
	299	.mmap = sock_no_mmap,
	300	};
	301
23b7869c LRV	302	static void rawsock_destruct(struct sock *sk)
23b7869c LRV	303	{
20c239c1	304	pr_debug("sk=%p\n", sk);
23b7869c LRV	305
	306	if (sk->sk_state == TCP_ESTABLISHED) {
	307	nfc_deactivate_target(nfc_rawsock(sk)->dev,
96d4581f CR	308	nfc_rawsock(sk)->target_idx,
96d4581f CR	309	NFC_TARGET_MODE_IDLE);
23b7869c LRV	310	nfc_put_device(nfc_rawsock(sk)->dev);
	311	}
	312
	313	skb_queue_purge(&sk->sk_receive_queue);
	314
	315	if (!sock_flag(sk, SOCK_DEAD)) {
ed1e0ad8	316	pr_err("Freeing alive NFC raw socket %p\n", sk);
23b7869c LRV	317	return;
	318	}
	319	}
	320
	321	static int rawsock_create(struct net net, struct socket sock,
11aa9c28	322	const struct nfc_protocol *nfc_proto, int kern)
23b7869c LRV	323	{
	324	struct sock *sk;
	325
20c239c1	326	pr_debug("sock=%p\n", sock);
23b7869c	327
57be1f3f	328	if ((sock->type != SOCK_SEQPACKET) && (sock->type != SOCK_RAW))
23b7869c LRV	329	return -ESOCKTNOSUPPORT;
23b7869c LRV	330
57be1f3f HT	331	if (sock->type == SOCK_RAW)
	332	sock->ops = &rawsock_raw_ops;
	333	else
	334	sock->ops = &rawsock_ops;
23b7869c	335
11aa9c28	336	sk = sk_alloc(net, PF_NFC, GFP_ATOMIC, nfc_proto->proto, kern);
23b7869c LRV	337	if (!sk)
	338	return -ENOMEM;
	339
	340	sock_init_data(sock, sk);
	341	sk->sk_protocol = nfc_proto->id;
	342	sk->sk_destruct = rawsock_destruct;
	343	sock->state = SS_UNCONNECTED;
57be1f3f HT	344	if (sock->type == SOCK_RAW)
	345	nfc_sock_link(&raw_sk_list, sk);
	346	else {
	347	INIT_WORK(&nfc_rawsock(sk)->tx_work, rawsock_tx_work);
	348	nfc_rawsock(sk)->tx_work_scheduled = false;
	349	}
23b7869c LRV	350
	351	return 0;
	352	}
	353
57be1f3f HT	354	void nfc_send_to_raw_sock(struct nfc_dev dev, struct sk_buff skb,
	355	u8 payload_type, u8 direction)
	356	{
	357	struct sk_buff skb_copy = NULL, nskb;
	358	struct sock *sk;
	359	u8 *data;
	360
	361	read_lock(&raw_sk_list.lock);
	362
	363	sk_for_each(sk, &raw_sk_list.head) {
	364	if (!skb_copy) {
bad93e9d OP	365	skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
bad93e9d OP	366	GFP_ATOMIC, true);
57be1f3f HT	367	if (!skb_copy)
	368	continue;
	369
	370	data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
	371
	372	data[0] = dev ? dev->idx : 0xFF;
	373	data[1] = direction & 0x01;
	374	data[1] \|= (payload_type << 1);
	375	}
	376
	377	nskb = skb_clone(skb_copy, GFP_ATOMIC);
	378	if (!nskb)
	379	continue;
	380
	381	if (sock_queue_rcv_skb(sk, nskb))
	382	kfree_skb(nskb);
	383	}
	384
	385	read_unlock(&raw_sk_list.lock);
	386
	387	kfree_skb(skb_copy);
	388	}
	389	EXPORT_SYMBOL(nfc_send_to_raw_sock);
	390
23b7869c LRV	391	static struct proto rawsock_proto = {
	392	.name = "NFC_RAW",
	393	.owner = THIS_MODULE,
	394	.obj_size = sizeof(struct nfc_rawsock),
	395	};
	396
	397	static const struct nfc_protocol rawsock_nfc_proto = {
	398	.id = NFC_SOCKPROTO_RAW,
	399	.proto = &rawsock_proto,
	400	.owner = THIS_MODULE,
	401	.create = rawsock_create
	402	};
	403
	404	int __init rawsock_init(void)
	405	{
	406	int rc;
	407
	408	rc = nfc_proto_register(&rawsock_nfc_proto);
	409
	410	return rc;
	411	}
	412
	413	void rawsock_exit(void)
	414	{
	415	nfc_proto_unregister(&rawsock_nfc_proto);
	416	}