[deliverable/linux.git] / net / nfc / llcp / sock.c

/*
 * Copyright (C) 2011  Intel Corporation. All rights reserved.
 *
 * 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) "llcp: %s: " fmt, __func__

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/nfc.h>

#include "../nfc.h"
#include "llcp.h"

static int sock_wait_state(struct sock *sk, int state, unsigned long timeo)
{
	DECLARE_WAITQUEUE(wait, current);
	int err = 0;

	pr_debug("sk %p", sk);

	add_wait_queue(sk_sleep(sk), &wait);
	set_current_state(TASK_INTERRUPTIBLE);

	while (sk->sk_state != state) {
		if (!timeo) {
			err = -EINPROGRESS;
			break;
		}

		if (signal_pending(current)) {
			err = sock_intr_errno(timeo);
			break;
		}

		release_sock(sk);
		timeo = schedule_timeout(timeo);
		lock_sock(sk);
		set_current_state(TASK_INTERRUPTIBLE);

		err = sock_error(sk);
		if (err)
			break;
	}

	__set_current_state(TASK_RUNNING);
	remove_wait_queue(sk_sleep(sk), &wait);
	return err;
}

static struct proto llcp_sock_proto = {
	.name     = "NFC_LLCP",
	.owner    = THIS_MODULE,
	.obj_size = sizeof(struct nfc_llcp_sock),
};

static int llcp_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
{
	struct sock *sk = sock->sk;
	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	struct nfc_llcp_local *local;
	struct nfc_dev *dev;
	struct sockaddr_nfc_llcp llcp_addr;
	int len, ret = 0;

	pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);

	if (!addr || addr->sa_family != AF_NFC)
		return -EINVAL;

	memset(&llcp_addr, 0, sizeof(llcp_addr));
	len = min_t(unsigned int, sizeof(llcp_addr), alen);
	memcpy(&llcp_addr, addr, len);

	/* This is going to be a listening socket, dsap must be 0 */
	if (llcp_addr.dsap != 0)
		return -EINVAL;

	lock_sock(sk);

	if (sk->sk_state != LLCP_CLOSED) {
		ret = -EBADFD;
		goto error;
	}

	dev = nfc_get_device(llcp_addr.dev_idx);
	if (dev == NULL) {
		ret = -ENODEV;
		goto error;
	}

	local = nfc_llcp_find_local(dev);
	if (local == NULL) {
		ret = -ENODEV;
		goto put_dev;
	}

	llcp_sock->dev = dev;
	llcp_sock->local = nfc_llcp_local_get(local);
	llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
	llcp_sock->service_name_len = min_t(unsigned int,
					    llcp_addr.service_name_len,
					    NFC_LLCP_MAX_SERVICE_NAME);
	llcp_sock->service_name = kmemdup(llcp_addr.service_name,
					  llcp_sock->service_name_len,
					  GFP_KERNEL);

	llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock);
	if (llcp_sock->ssap == LLCP_MAX_SAP)
		goto put_dev;

	local->sockets[llcp_sock->ssap] = llcp_sock;

	pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap);

	sk->sk_state = LLCP_BOUND;

put_dev:
	nfc_put_device(dev);

error:
	release_sock(sk);
	return ret;
}

static int llcp_sock_listen(struct socket *sock, int backlog)
{
	struct sock *sk = sock->sk;
	int ret = 0;

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

	lock_sock(sk);

	if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM)
	    || sk->sk_state != LLCP_BOUND) {
		ret = -EBADFD;
		goto error;
	}

	sk->sk_max_ack_backlog = backlog;
	sk->sk_ack_backlog = 0;

	pr_debug("Socket listening\n");
	sk->sk_state = LLCP_LISTEN;

error:
	release_sock(sk);

	return ret;
}

void nfc_llcp_accept_unlink(struct sock *sk)
{
	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);

	pr_debug("state %d\n", sk->sk_state);

	list_del_init(&llcp_sock->accept_queue);
	sk_acceptq_removed(llcp_sock->parent);
	llcp_sock->parent = NULL;

	sock_put(sk);
}

void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk)
{
	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);

	/* Lock will be free from unlink */
	sock_hold(sk);

	list_add_tail(&llcp_sock->accept_queue,
		      &llcp_sock_parent->accept_queue);
	llcp_sock->parent = parent;
	sk_acceptq_added(parent);
}

struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
				     struct socket *newsock)
{
	struct nfc_llcp_sock *lsk, *n, *llcp_parent;
	struct sock *sk;

	llcp_parent = nfc_llcp_sock(parent);

	list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
				 accept_queue) {
		sk = &lsk->sk;
		lock_sock(sk);

		if (sk->sk_state == LLCP_CLOSED) {
			release_sock(sk);
			nfc_llcp_accept_unlink(sk);
			continue;
		}

		if (sk->sk_state == LLCP_CONNECTED || !newsock) {
			nfc_llcp_accept_unlink(sk);
			if (newsock)
				sock_graft(sk, newsock);

			release_sock(sk);

			pr_debug("Returning sk state %d\n", sk->sk_state);

			return sk;
		}

		release_sock(sk);
	}

	return NULL;
}

static int llcp_sock_accept(struct socket *sock, struct socket *newsock,
			    int flags)
{
	DECLARE_WAITQUEUE(wait, current);
	struct sock *sk = sock->sk, *new_sk;
	long timeo;
	int ret = 0;

	pr_debug("parent %p\n", sk);

	lock_sock_nested(sk, SINGLE_DEPTH_NESTING);

	if (sk->sk_state != LLCP_LISTEN) {
		ret = -EBADFD;
		goto error;
	}

	timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);

	/* Wait for an incoming connection. */
	add_wait_queue_exclusive(sk_sleep(sk), &wait);
	while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
		set_current_state(TASK_INTERRUPTIBLE);

		if (!timeo) {
			ret = -EAGAIN;
			break;
		}

		if (signal_pending(current)) {
			ret = sock_intr_errno(timeo);
			break;
		}

		release_sock(sk);
		timeo = schedule_timeout(timeo);
		lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
	}
	__set_current_state(TASK_RUNNING);
	remove_wait_queue(sk_sleep(sk), &wait);

	if (ret)
		goto error;

	newsock->state = SS_CONNECTED;

	pr_debug("new socket %p\n", new_sk);

error:
	release_sock(sk);

	return ret;
}

static int llcp_sock_getname(struct socket *sock, struct sockaddr *addr,
			     int *len, int peer)
{
	struct sockaddr_nfc_llcp *llcp_addr = (struct sockaddr_nfc_llcp *)addr;
	struct sock *sk = sock->sk;
	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);

	pr_debug("%p\n", sk);

	addr->sa_family = AF_NFC;
	*len = sizeof(struct sockaddr_nfc_llcp);

	llcp_addr->dev_idx = llcp_sock->dev->idx;
	llcp_addr->dsap = llcp_sock->dsap;
	llcp_addr->ssap = llcp_sock->ssap;
	llcp_addr->service_name_len = llcp_sock->service_name_len;
	memcpy(llcp_addr->service_name, llcp_sock->service_name,
	       llcp_addr->service_name_len);

	return 0;
}

static inline unsigned int llcp_accept_poll(struct sock *parent)
{
	struct nfc_llcp_sock *llcp_sock, *n, *parent_sock;
	struct sock *sk;

	parent_sock = nfc_llcp_sock(parent);

	list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue,
				 accept_queue) {
		sk = &llcp_sock->sk;

		if (sk->sk_state == LLCP_CONNECTED)
			return POLLIN | POLLRDNORM;
	}

	return 0;
}

static unsigned int llcp_sock_poll(struct file *file, struct socket *sock,
				   poll_table *wait)
{
	struct sock *sk = sock->sk;
	unsigned int mask = 0;

	pr_debug("%p\n", sk);

	sock_poll_wait(file, sk_sleep(sk), wait);

	if (sk->sk_state == LLCP_LISTEN)
		return llcp_accept_poll(sk);

	if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
		mask |= POLLERR;

	if (!skb_queue_empty(&sk->sk_receive_queue))
		mask |= POLLIN | POLLRDNORM;

	if (sk->sk_state == LLCP_CLOSED)
		mask |= POLLHUP;

	if (sk->sk_shutdown & RCV_SHUTDOWN)
		mask |= POLLRDHUP | POLLIN | POLLRDNORM;

	if (sk->sk_shutdown == SHUTDOWN_MASK)
		mask |= POLLHUP;

	if (sock_writeable(sk))
		mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
	else
		set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);

	pr_debug("mask 0x%x\n", mask);

	return mask;
}

static int llcp_sock_release(struct socket *sock)
{
	struct sock *sk = sock->sk;
	struct nfc_llcp_local *local;
	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	int err = 0;

	if (!sk)
		return 0;

	pr_debug("%p\n", sk);

	local = llcp_sock->local;
	if (local == NULL) {
		err = -ENODEV;
		goto out;
	}

	mutex_lock(&local->socket_lock);

	if (llcp_sock == local->sockets[llcp_sock->ssap])
		local->sockets[llcp_sock->ssap] = NULL;
	else
		list_del_init(&llcp_sock->list);

	mutex_unlock(&local->socket_lock);

	lock_sock(sk);

	/* Send a DISC */
	if (sk->sk_state == LLCP_CONNECTED)
		nfc_llcp_disconnect(llcp_sock);

	if (sk->sk_state == LLCP_LISTEN) {
		struct nfc_llcp_sock *lsk, *n;
		struct sock *accept_sk;

		list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
					 accept_queue) {
			accept_sk = &lsk->sk;
			lock_sock(accept_sk);

			nfc_llcp_disconnect(lsk);
			nfc_llcp_accept_unlink(accept_sk);

			release_sock(accept_sk);

			sock_orphan(accept_sk);
		}
	}

	/* Freeing the SAP */
	if ((sk->sk_state == LLCP_CONNECTED
	     && llcp_sock->ssap > LLCP_LOCAL_SAP_OFFSET) ||
	    sk->sk_state == LLCP_BOUND || sk->sk_state == LLCP_LISTEN)
		nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);

	release_sock(sk);

out:
	sock_orphan(sk);
	sock_put(sk);

	return err;
}

static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
			     int len, int flags)
{
	struct sock *sk = sock->sk;
	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
	struct nfc_dev *dev;
	struct nfc_llcp_local *local;
	int ret = 0;

	pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);

	if (!addr || len < sizeof(struct sockaddr_nfc) ||
	    addr->sa_family != AF_NFC) {
		pr_err("Invalid socket\n");
		return -EINVAL;
	}

	if (addr->service_name_len == 0 && addr->dsap == 0) {
		pr_err("Missing service name or dsap\n");
		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 (sk->sk_state == LLCP_CONNECTED) {
		ret = -EISCONN;
		goto error;
	}

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

	local = nfc_llcp_find_local(dev);
	if (local == NULL) {
		ret = -ENODEV;
		goto put_dev;
	}

	device_lock(&dev->dev);
	if (dev->dep_link_up == false) {
		ret = -ENOLINK;
		device_unlock(&dev->dev);
		goto put_dev;
	}
	device_unlock(&dev->dev);

	if (local->rf_mode == NFC_RF_INITIATOR &&
	    addr->target_idx != local->target_idx) {
		ret = -ENOLINK;
		goto put_dev;
	}

	llcp_sock->dev = dev;
	llcp_sock->local = nfc_llcp_local_get(local);
	llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
	if (llcp_sock->ssap == LLCP_SAP_MAX) {
		ret = -ENOMEM;
		goto put_dev;
	}
	if (addr->service_name_len == 0)
		llcp_sock->dsap = addr->dsap;
	else
		llcp_sock->dsap = LLCP_SAP_SDP;
	llcp_sock->nfc_protocol = addr->nfc_protocol;
	llcp_sock->service_name_len = min_t(unsigned int,
					    addr->service_name_len,
					    NFC_LLCP_MAX_SERVICE_NAME);
	llcp_sock->service_name = kmemdup(addr->service_name,
					  llcp_sock->service_name_len,
					  GFP_KERNEL);

	local->sockets[llcp_sock->ssap] = llcp_sock;

	ret = nfc_llcp_send_connect(llcp_sock);
	if (ret)
		goto put_dev;

	ret = sock_wait_state(sk, LLCP_CONNECTED,
			      sock_sndtimeo(sk, flags & O_NONBLOCK));
	if (ret)
		goto put_dev;

	release_sock(sk);

	return 0;

put_dev:
	nfc_put_device(dev);

error:
	release_sock(sk);
	return ret;
}

static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
			     struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	int ret;

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

	ret = sock_error(sk);
	if (ret)
		return ret;

	if (msg->msg_flags & MSG_OOB)
		return -EOPNOTSUPP;

	lock_sock(sk);

	if (sk->sk_state != LLCP_CONNECTED) {
		release_sock(sk);
		return -ENOTCONN;
	}

	release_sock(sk);

	return nfc_llcp_send_i_frame(llcp_sock, msg, len);
}

static int llcp_sock_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;
	unsigned int copied, rlen;
	struct sk_buff *skb, *cskb;
	int err = 0;

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

	lock_sock(sk);

	if (sk->sk_state == LLCP_CLOSED &&
	    skb_queue_empty(&sk->sk_receive_queue)) {
		release_sock(sk);
		return 0;
	}

	release_sock(sk);

	if (flags & (MSG_OOB))
		return -EOPNOTSUPP;

	skb = skb_recv_datagram(sk, flags, noblock, &err);
	if (!skb) {
		pr_err("Recv datagram failed state %d %d %d",
		       sk->sk_state, err, sock_error(sk));

		if (sk->sk_shutdown & RCV_SHUTDOWN)
			return 0;

		return err;
	}

	rlen = skb->len;		/* real length of skb */
	copied = min_t(unsigned int, rlen, len);

	cskb = skb;
	if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
		if (!(flags & MSG_PEEK))
			skb_queue_head(&sk->sk_receive_queue, skb);
		return -EFAULT;
	}

	/* Mark read part of skb as used */
	if (!(flags & MSG_PEEK)) {

		/* SOCK_STREAM: re-queue skb if it contains unreceived data */
		if (sk->sk_type == SOCK_STREAM) {
			skb_pull(skb, copied);
			if (skb->len) {
				skb_queue_head(&sk->sk_receive_queue, skb);
				goto done;
			}
		}

		kfree_skb(skb);
	}

	/* XXX Queue backlogged skbs */

done:
	/* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
	if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
		copied = rlen;

	return copied;
}

static const struct proto_ops llcp_sock_ops = {
	.family         = PF_NFC,
	.owner          = THIS_MODULE,
	.bind           = llcp_sock_bind,
	.connect        = llcp_sock_connect,
	.release        = llcp_sock_release,
	.socketpair     = sock_no_socketpair,
	.accept         = llcp_sock_accept,
	.getname        = llcp_sock_getname,
	.poll           = llcp_sock_poll,
	.ioctl          = sock_no_ioctl,
	.listen         = llcp_sock_listen,
	.shutdown       = sock_no_shutdown,
	.setsockopt     = sock_no_setsockopt,
	.getsockopt     = sock_no_getsockopt,
	.sendmsg        = llcp_sock_sendmsg,
	.recvmsg        = llcp_sock_recvmsg,
	.mmap           = sock_no_mmap,
};

static void llcp_sock_destruct(struct sock *sk)
{
	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);

	pr_debug("%p\n", sk);

	if (sk->sk_state == LLCP_CONNECTED)
		nfc_put_device(llcp_sock->dev);

	skb_queue_purge(&sk->sk_receive_queue);

	nfc_llcp_sock_free(llcp_sock);

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

struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp)
{
	struct sock *sk;
	struct nfc_llcp_sock *llcp_sock;

	sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
	if (!sk)
		return NULL;

	llcp_sock = nfc_llcp_sock(sk);

	sock_init_data(sock, sk);
	sk->sk_state = LLCP_CLOSED;
	sk->sk_protocol = NFC_SOCKPROTO_LLCP;
	sk->sk_type = type;
	sk->sk_destruct = llcp_sock_destruct;

	llcp_sock->ssap = 0;
	llcp_sock->dsap = LLCP_SAP_SDP;
	llcp_sock->send_n = llcp_sock->send_ack_n = 0;
	llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
	llcp_sock->remote_ready = 1;
	skb_queue_head_init(&llcp_sock->tx_queue);
	skb_queue_head_init(&llcp_sock->tx_pending_queue);
	skb_queue_head_init(&llcp_sock->tx_backlog_queue);
	INIT_LIST_HEAD(&llcp_sock->list);
	INIT_LIST_HEAD(&llcp_sock->accept_queue);

	if (sock != NULL)
		sock->state = SS_UNCONNECTED;

	return sk;
}

void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
{
	kfree(sock->service_name);

	skb_queue_purge(&sock->tx_queue);
	skb_queue_purge(&sock->tx_pending_queue);
	skb_queue_purge(&sock->tx_backlog_queue);

	list_del_init(&sock->accept_queue);
	list_del_init(&sock->list);

	sock->parent = NULL;

	nfc_llcp_local_put(sock->local);
}

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

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

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

	sock->ops = &llcp_sock_ops;

	sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
	if (sk == NULL)
		return -ENOMEM;

	return 0;
}

static const struct nfc_protocol llcp_nfc_proto = {
	.id	  = NFC_SOCKPROTO_LLCP,
	.proto    = &llcp_sock_proto,
	.owner    = THIS_MODULE,
	.create   = llcp_sock_create
};

int __init nfc_llcp_sock_init(void)
{
	return nfc_proto_register(&llcp_nfc_proto);
}

void nfc_llcp_sock_exit(void)
{
	nfc_proto_unregister(&llcp_nfc_proto);
}
Commit	Line	Data
d646960f SO	1	/*
	2	* Copyright (C) 2011 Intel Corporation. All rights reserved.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the
	16	* Free Software Foundation, Inc.,
	17	* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	18	*/
	19
	20	#define pr_fmt(fmt) "llcp: %s: " fmt, __func__
	21
	22	#include <linux/init.h>
	23	#include <linux/kernel.h>
	24	#include <linux/module.h>
	25	#include <linux/nfc.h>
	26
	27	#include "../nfc.h"
	28	#include "llcp.h"
	29
ff353d86 SO	30	static int sock_wait_state(struct sock *sk, int state, unsigned long timeo)
	31	{
	32	DECLARE_WAITQUEUE(wait, current);
	33	int err = 0;
	34
	35	pr_debug("sk %p", sk);
	36
	37	add_wait_queue(sk_sleep(sk), &wait);
	38	set_current_state(TASK_INTERRUPTIBLE);
	39
	40	while (sk->sk_state != state) {
	41	if (!timeo) {
	42	err = -EINPROGRESS;
	43	break;
	44	}
	45
	46	if (signal_pending(current)) {
	47	err = sock_intr_errno(timeo);
	48	break;
	49	}
	50
	51	release_sock(sk);
	52	timeo = schedule_timeout(timeo);
	53	lock_sock(sk);
	54	set_current_state(TASK_INTERRUPTIBLE);
	55
	56	err = sock_error(sk);
	57	if (err)
	58	break;
	59	}
	60
	61	__set_current_state(TASK_RUNNING);
	62	remove_wait_queue(sk_sleep(sk), &wait);
	63	return err;
	64	}
	65
d646960f SO	66	static struct proto llcp_sock_proto = {
	67	.name = "NFC_LLCP",
	68	.owner = THIS_MODULE,
	69	.obj_size = sizeof(struct nfc_llcp_sock),
	70	};
	71
	72	static int llcp_sock_bind(struct socket sock, struct sockaddr addr, int alen)
	73	{
	74	struct sock *sk = sock->sk;
	75	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	76	struct nfc_llcp_local *local;
	77	struct nfc_dev *dev;
	78	struct sockaddr_nfc_llcp llcp_addr;
	79	int len, ret = 0;
	80
	81	pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
	82
	83	if (!addr \|\| addr->sa_family != AF_NFC)
	84	return -EINVAL;
	85
	86	memset(&llcp_addr, 0, sizeof(llcp_addr));
	87	len = min_t(unsigned int, sizeof(llcp_addr), alen);
	88	memcpy(&llcp_addr, addr, len);
	89
	90	/* This is going to be a listening socket, dsap must be 0 */
	91	if (llcp_addr.dsap != 0)
	92	return -EINVAL;
	93
	94	lock_sock(sk);
	95
	96	if (sk->sk_state != LLCP_CLOSED) {
	97	ret = -EBADFD;
	98	goto error;
	99	}
	100
	101	dev = nfc_get_device(llcp_addr.dev_idx);
	102	if (dev == NULL) {
	103	ret = -ENODEV;
	104	goto error;
	105	}
	106
	107	local = nfc_llcp_find_local(dev);
	108	if (local == NULL) {
	109	ret = -ENODEV;
	110	goto put_dev;
	111	}
	112
	113	llcp_sock->dev = dev;
c7aa1225	114	llcp_sock->local = nfc_llcp_local_get(local);
d646960f SO	115	llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
d646960f SO	116	llcp_sock->service_name_len = min_t(unsigned int,
427a2eb1 SO	117	llcp_addr.service_name_len,
427a2eb1 SO	118	NFC_LLCP_MAX_SERVICE_NAME);
d646960f	119	llcp_sock->service_name = kmemdup(llcp_addr.service_name,
427a2eb1 SO	120	llcp_sock->service_name_len,
427a2eb1 SO	121	GFP_KERNEL);
d646960f SO	122
	123	llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock);
	124	if (llcp_sock->ssap == LLCP_MAX_SAP)
	125	goto put_dev;
	126
	127	local->sockets[llcp_sock->ssap] = llcp_sock;
	128
	129	pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap);
	130
	131	sk->sk_state = LLCP_BOUND;
	132
	133	put_dev:
	134	nfc_put_device(dev);
	135
	136	error:
	137	release_sock(sk);
	138	return ret;
	139	}
	140
	141	static int llcp_sock_listen(struct socket *sock, int backlog)
	142	{
	143	struct sock *sk = sock->sk;
	144	int ret = 0;
	145
	146	pr_debug("sk %p backlog %d\n", sk, backlog);
	147
	148	lock_sock(sk);
	149
	150	if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM)
427a2eb1	151	\|\| sk->sk_state != LLCP_BOUND) {
d646960f SO	152	ret = -EBADFD;
	153	goto error;
	154	}
	155
	156	sk->sk_max_ack_backlog = backlog;
	157	sk->sk_ack_backlog = 0;
	158
	159	pr_debug("Socket listening\n");
	160	sk->sk_state = LLCP_LISTEN;
	161
	162	error:
	163	release_sock(sk);
	164
	165	return ret;
	166	}
	167
	168	void nfc_llcp_accept_unlink(struct sock *sk)
	169	{
	170	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	171
	172	pr_debug("state %d\n", sk->sk_state);
	173
	174	list_del_init(&llcp_sock->accept_queue);
	175	sk_acceptq_removed(llcp_sock->parent);
	176	llcp_sock->parent = NULL;
	177
	178	sock_put(sk);
	179	}
	180
	181	void nfc_llcp_accept_enqueue(struct sock parent, struct sock sk)
	182	{
	183	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	184	struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
	185
	186	/* Lock will be free from unlink */
	187	sock_hold(sk);
	188
	189	list_add_tail(&llcp_sock->accept_queue,
427a2eb1	190	&llcp_sock_parent->accept_queue);
d646960f SO	191	llcp_sock->parent = parent;
	192	sk_acceptq_added(parent);
	193	}
	194
	195	struct sock nfc_llcp_accept_dequeue(struct sock parent,
427a2eb1	196	struct socket *newsock)
d646960f SO	197	{
	198	struct nfc_llcp_sock lsk, n, *llcp_parent;
	199	struct sock *sk;
	200
	201	llcp_parent = nfc_llcp_sock(parent);
	202
	203	list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
427a2eb1	204	accept_queue) {
d646960f SO	205	sk = &lsk->sk;
	206	lock_sock(sk);
	207
	208	if (sk->sk_state == LLCP_CLOSED) {
	209	release_sock(sk);
	210	nfc_llcp_accept_unlink(sk);
	211	continue;
	212	}
	213
	214	if (sk->sk_state == LLCP_CONNECTED \|\| !newsock) {
	215	nfc_llcp_accept_unlink(sk);
	216	if (newsock)
	217	sock_graft(sk, newsock);
	218
	219	release_sock(sk);
	220
	221	pr_debug("Returning sk state %d\n", sk->sk_state);
	222
	223	return sk;
	224	}
	225
	226	release_sock(sk);
	227	}
	228
	229	return NULL;
	230	}
	231
	232	static int llcp_sock_accept(struct socket sock, struct socket newsock,
427a2eb1	233	int flags)
d646960f SO	234	{
	235	DECLARE_WAITQUEUE(wait, current);
	236	struct sock sk = sock->sk, new_sk;
	237	long timeo;
	238	int ret = 0;
	239
	240	pr_debug("parent %p\n", sk);
	241
	242	lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
	243
	244	if (sk->sk_state != LLCP_LISTEN) {
	245	ret = -EBADFD;
	246	goto error;
	247	}
	248
	249	timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
	250
	251	/* Wait for an incoming connection. */
	252	add_wait_queue_exclusive(sk_sleep(sk), &wait);
	253	while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
	254	set_current_state(TASK_INTERRUPTIBLE);
	255
	256	if (!timeo) {
	257	ret = -EAGAIN;
	258	break;
	259	}
	260
	261	if (signal_pending(current)) {
	262	ret = sock_intr_errno(timeo);
	263	break;
	264	}
	265
	266	release_sock(sk);
	267	timeo = schedule_timeout(timeo);
	268	lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
	269	}
	270	__set_current_state(TASK_RUNNING);
	271	remove_wait_queue(sk_sleep(sk), &wait);
	272
	273	if (ret)
	274	goto error;
	275
	276	newsock->state = SS_CONNECTED;
	277
	278	pr_debug("new socket %p\n", new_sk);
	279
	280	error:
	281	release_sock(sk);
	282
	283	return ret;
	284	}
	285
	286	static int llcp_sock_getname(struct socket sock, struct sockaddr addr,
	287	int *len, int peer)
	288	{
427a2eb1	289	struct sockaddr_nfc_llcp llcp_addr = (struct sockaddr_nfc_llcp )addr;
d646960f SO	290	struct sock *sk = sock->sk;
	291	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	292
	293	pr_debug("%p\n", sk);
	294
	295	addr->sa_family = AF_NFC;
	296	*len = sizeof(struct sockaddr_nfc_llcp);
	297
	298	llcp_addr->dev_idx = llcp_sock->dev->idx;
	299	llcp_addr->dsap = llcp_sock->dsap;
	300	llcp_addr->ssap = llcp_sock->ssap;
	301	llcp_addr->service_name_len = llcp_sock->service_name_len;
	302	memcpy(llcp_addr->service_name, llcp_sock->service_name,
427a2eb1	303	llcp_addr->service_name_len);
d646960f SO	304
	305	return 0;
	306	}
	307
	308	static inline unsigned int llcp_accept_poll(struct sock *parent)
	309	{
	310	struct nfc_llcp_sock llcp_sock, n, *parent_sock;
	311	struct sock *sk;
	312
	313	parent_sock = nfc_llcp_sock(parent);
	314
	315	list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue,
427a2eb1	316	accept_queue) {
d646960f SO	317	sk = &llcp_sock->sk;
	318
	319	if (sk->sk_state == LLCP_CONNECTED)
	320	return POLLIN \| POLLRDNORM;
	321	}
	322
	323	return 0;
	324	}
	325
	326	static unsigned int llcp_sock_poll(struct file file, struct socket sock,
427a2eb1	327	poll_table *wait)
d646960f SO	328	{
	329	struct sock *sk = sock->sk;
	330	unsigned int mask = 0;
	331
	332	pr_debug("%p\n", sk);
	333
	334	sock_poll_wait(file, sk_sleep(sk), wait);
	335
	336	if (sk->sk_state == LLCP_LISTEN)
	337	return llcp_accept_poll(sk);
	338
	339	if (sk->sk_err \|\| !skb_queue_empty(&sk->sk_error_queue))
	340	mask \|= POLLERR;
	341
	342	if (!skb_queue_empty(&sk->sk_receive_queue))
4260c13b	343	mask \|= POLLIN \| POLLRDNORM;
d646960f SO	344
	345	if (sk->sk_state == LLCP_CLOSED)
	346	mask \|= POLLHUP;
	347
4260c13b SO	348	if (sk->sk_shutdown & RCV_SHUTDOWN)
	349	mask \|= POLLRDHUP \| POLLIN \| POLLRDNORM;
	350
	351	if (sk->sk_shutdown == SHUTDOWN_MASK)
	352	mask \|= POLLHUP;
	353
	354	if (sock_writeable(sk))
	355	mask \|= POLLOUT \| POLLWRNORM \| POLLWRBAND;
	356	else
	357	set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
	358
	359	pr_debug("mask 0x%x\n", mask);
	360
d646960f SO	361	return mask;
	362	}
	363
	364	static int llcp_sock_release(struct socket *sock)
	365	{
	366	struct sock *sk = sock->sk;
	367	struct nfc_llcp_local *local;
	368	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
40c75f81	369	int err = 0;
d646960f SO	370
	371	if (!sk)
	372	return 0;
	373
	374	pr_debug("%p\n", sk);
	375
	376	local = llcp_sock->local;
40c75f81 SO	377	if (local == NULL) {
	378	err = -ENODEV;
	379	goto out;
	380	}
d646960f SO	381
	382	mutex_lock(&local->socket_lock);
	383
0c318359	384	if (llcp_sock == local->sockets[llcp_sock->ssap])
d646960f	385	local->sockets[llcp_sock->ssap] = NULL;
0c318359	386	else
40c75f81	387	list_del_init(&llcp_sock->list);
d646960f SO	388
	389	mutex_unlock(&local->socket_lock);
	390
	391	lock_sock(sk);
	392
	393	/* Send a DISC */
	394	if (sk->sk_state == LLCP_CONNECTED)
	395	nfc_llcp_disconnect(llcp_sock);
	396
	397	if (sk->sk_state == LLCP_LISTEN) {
	398	struct nfc_llcp_sock lsk, n;
	399	struct sock *accept_sk;
	400
	401	list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
427a2eb1	402	accept_queue) {
d646960f SO	403	accept_sk = &lsk->sk;
	404	lock_sock(accept_sk);
	405
	406	nfc_llcp_disconnect(lsk);
	407	nfc_llcp_accept_unlink(accept_sk);
	408
	409	release_sock(accept_sk);
	410
d646960f	411	sock_orphan(accept_sk);
d646960f SO	412	}
	413	}
	414
	415	/* Freeing the SAP */
	416	if ((sk->sk_state == LLCP_CONNECTED
427a2eb1 SO	417	&& llcp_sock->ssap > LLCP_LOCAL_SAP_OFFSET) \|\|
427a2eb1 SO	418	sk->sk_state == LLCP_BOUND \|\| sk->sk_state == LLCP_LISTEN)
d646960f SO	419	nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
d646960f SO	420
d646960f SO	421	release_sock(sk);
d646960f SO	422
40c75f81	423	out:
d646960f SO	424	sock_orphan(sk);
	425	sock_put(sk);
	426
40c75f81	427	return err;
d646960f SO	428	}
	429
	430	static int llcp_sock_connect(struct socket sock, struct sockaddr _addr,
427a2eb1	431	int len, int flags)
d646960f SO	432	{
	433	struct sock *sk = sock->sk;
	434	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	435	struct sockaddr_nfc_llcp addr = (struct sockaddr_nfc_llcp )_addr;
	436	struct nfc_dev *dev;
	437	struct nfc_llcp_local *local;
	438	int ret = 0;
	439
	440	pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
	441
	442	if (!addr \|\| len < sizeof(struct sockaddr_nfc) \|\|
427a2eb1	443	addr->sa_family != AF_NFC) {
d646960f SO	444	pr_err("Invalid socket\n");
	445	return -EINVAL;
	446	}
	447
	448	if (addr->service_name_len == 0 && addr->dsap == 0) {
	449	pr_err("Missing service name or dsap\n");
	450	return -EINVAL;
	451	}
	452
	453	pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
427a2eb1	454	addr->target_idx, addr->nfc_protocol);
d646960f SO	455
	456	lock_sock(sk);
	457
	458	if (sk->sk_state == LLCP_CONNECTED) {
	459	ret = -EISCONN;
	460	goto error;
	461	}
	462
	463	dev = nfc_get_device(addr->dev_idx);
	464	if (dev == NULL) {
	465	ret = -ENODEV;
	466	goto error;
	467	}
	468
	469	local = nfc_llcp_find_local(dev);
	470	if (local == NULL) {
	471	ret = -ENODEV;
	472	goto put_dev;
	473	}
	474
	475	device_lock(&dev->dev);
	476	if (dev->dep_link_up == false) {
	477	ret = -ENOLINK;
	478	device_unlock(&dev->dev);
	479	goto put_dev;
	480	}
	481	device_unlock(&dev->dev);
	482
	483	if (local->rf_mode == NFC_RF_INITIATOR &&
427a2eb1	484	addr->target_idx != local->target_idx) {
d646960f SO	485	ret = -ENOLINK;
	486	goto put_dev;
	487	}
	488
	489	llcp_sock->dev = dev;
c7aa1225	490	llcp_sock->local = nfc_llcp_local_get(local);
d646960f SO	491	llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
	492	if (llcp_sock->ssap == LLCP_SAP_MAX) {
	493	ret = -ENOMEM;
	494	goto put_dev;
	495	}
	496	if (addr->service_name_len == 0)
	497	llcp_sock->dsap = addr->dsap;
	498	else
	499	llcp_sock->dsap = LLCP_SAP_SDP;
	500	llcp_sock->nfc_protocol = addr->nfc_protocol;
	501	llcp_sock->service_name_len = min_t(unsigned int,
427a2eb1 SO	502	addr->service_name_len,
427a2eb1 SO	503	NFC_LLCP_MAX_SERVICE_NAME);
d646960f	504	llcp_sock->service_name = kmemdup(addr->service_name,
427a2eb1 SO	505	llcp_sock->service_name_len,
427a2eb1 SO	506	GFP_KERNEL);
d646960f SO	507
	508	local->sockets[llcp_sock->ssap] = llcp_sock;
	509
	510	ret = nfc_llcp_send_connect(llcp_sock);
	511	if (ret)
	512	goto put_dev;
	513
ff353d86 SO	514	ret = sock_wait_state(sk, LLCP_CONNECTED,
	515	sock_sndtimeo(sk, flags & O_NONBLOCK));
	516	if (ret)
	517	goto put_dev;
d646960f SO	518
d646960f SO	519	release_sock(sk);
ff353d86	520
d646960f SO	521	return 0;
	522
	523	put_dev:
	524	nfc_put_device(dev);
	525
	526	error:
	527	release_sock(sk);
	528	return ret;
	529	}
	530
53a0ac2e	531	static int llcp_sock_sendmsg(struct kiocb iocb, struct socket sock,
427a2eb1	532	struct msghdr *msg, size_t len)
53a0ac2e SO	533	{
	534	struct sock *sk = sock->sk;
	535	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	536	int ret;
	537
	538	pr_debug("sock %p sk %p", sock, sk);
	539
	540	ret = sock_error(sk);
	541	if (ret)
	542	return ret;
	543
	544	if (msg->msg_flags & MSG_OOB)
	545	return -EOPNOTSUPP;
	546
	547	lock_sock(sk);
	548
	549	if (sk->sk_state != LLCP_CONNECTED) {
	550	release_sock(sk);
	551	return -ENOTCONN;
	552	}
	553
	554	release_sock(sk);
	555
	556	return nfc_llcp_send_i_frame(llcp_sock, msg, len);
	557	}
	558
d646960f SO	559	static int llcp_sock_recvmsg(struct kiocb iocb, struct socket sock,
	560	struct msghdr *msg, size_t len, int flags)
	561	{
	562	int noblock = flags & MSG_DONTWAIT;
	563	struct sock *sk = sock->sk;
	564	unsigned int copied, rlen;
	565	struct sk_buff skb, cskb;
	566	int err = 0;
	567
	568	pr_debug("%p %zu\n", sk, len);
	569
	570	lock_sock(sk);
	571
	572	if (sk->sk_state == LLCP_CLOSED &&
427a2eb1	573	skb_queue_empty(&sk->sk_receive_queue)) {
d646960f SO	574	release_sock(sk);
	575	return 0;
	576	}
	577
	578	release_sock(sk);
	579
	580	if (flags & (MSG_OOB))
	581	return -EOPNOTSUPP;
	582
	583	skb = skb_recv_datagram(sk, flags, noblock, &err);
	584	if (!skb) {
	585	pr_err("Recv datagram failed state %d %d %d",
427a2eb1	586	sk->sk_state, err, sock_error(sk));
d646960f SO	587
	588	if (sk->sk_shutdown & RCV_SHUTDOWN)
	589	return 0;
	590
	591	return err;
	592	}
	593
427a2eb1	594	rlen = skb->len; /* real length of skb */
d646960f SO	595	copied = min_t(unsigned int, rlen, len);
	596
	597	cskb = skb;
	598	if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
	599	if (!(flags & MSG_PEEK))
	600	skb_queue_head(&sk->sk_receive_queue, skb);
	601	return -EFAULT;
	602	}
	603
	604	/* Mark read part of skb as used */
	605	if (!(flags & MSG_PEEK)) {
	606
	607	/* SOCK_STREAM: re-queue skb if it contains unreceived data */
	608	if (sk->sk_type == SOCK_STREAM) {
	609	skb_pull(skb, copied);
	610	if (skb->len) {
	611	skb_queue_head(&sk->sk_receive_queue, skb);
	612	goto done;
	613	}
	614	}
	615
	616	kfree_skb(skb);
	617	}
	618
	619	/* XXX Queue backlogged skbs */
	620
	621	done:
	622	/* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
	623	if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
	624	copied = rlen;
	625
	626	return copied;
	627	}
	628
	629	static const struct proto_ops llcp_sock_ops = {
	630	.family = PF_NFC,
	631	.owner = THIS_MODULE,
	632	.bind = llcp_sock_bind,
	633	.connect = llcp_sock_connect,
	634	.release = llcp_sock_release,
	635	.socketpair = sock_no_socketpair,
	636	.accept = llcp_sock_accept,
	637	.getname = llcp_sock_getname,
	638	.poll = llcp_sock_poll,
	639	.ioctl = sock_no_ioctl,
	640	.listen = llcp_sock_listen,
	641	.shutdown = sock_no_shutdown,
	642	.setsockopt = sock_no_setsockopt,
	643	.getsockopt = sock_no_getsockopt,
53a0ac2e	644	.sendmsg = llcp_sock_sendmsg,
d646960f SO	645	.recvmsg = llcp_sock_recvmsg,
	646	.mmap = sock_no_mmap,
	647	};
	648
	649	static void llcp_sock_destruct(struct sock *sk)
	650	{
	651	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	652
	653	pr_debug("%p\n", sk);
	654
	655	if (sk->sk_state == LLCP_CONNECTED)
	656	nfc_put_device(llcp_sock->dev);
	657
	658	skb_queue_purge(&sk->sk_receive_queue);
	659
	660	nfc_llcp_sock_free(llcp_sock);
	661
	662	if (!sock_flag(sk, SOCK_DEAD)) {
	663	pr_err("Freeing alive NFC LLCP socket %p\n", sk);
	664	return;
	665	}
	666	}
	667
	668	struct sock nfc_llcp_sock_alloc(struct socket sock, int type, gfp_t gfp)
	669	{
	670	struct sock *sk;
	671	struct nfc_llcp_sock *llcp_sock;
	672
	673	sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
	674	if (!sk)
	675	return NULL;
	676
	677	llcp_sock = nfc_llcp_sock(sk);
	678
	679	sock_init_data(sock, sk);
	680	sk->sk_state = LLCP_CLOSED;
	681	sk->sk_protocol = NFC_SOCKPROTO_LLCP;
	682	sk->sk_type = type;
	683	sk->sk_destruct = llcp_sock_destruct;
	684
	685	llcp_sock->ssap = 0;
	686	llcp_sock->dsap = LLCP_SAP_SDP;
	687	llcp_sock->send_n = llcp_sock->send_ack_n = 0;
	688	llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
	689	llcp_sock->remote_ready = 1;
	690	skb_queue_head_init(&llcp_sock->tx_queue);
	691	skb_queue_head_init(&llcp_sock->tx_pending_queue);
	692	skb_queue_head_init(&llcp_sock->tx_backlog_queue);
	693	INIT_LIST_HEAD(&llcp_sock->list);
	694	INIT_LIST_HEAD(&llcp_sock->accept_queue);
	695
	696	if (sock != NULL)
	697	sock->state = SS_UNCONNECTED;
	698
	699	return sk;
	700	}
	701
	702	void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
	703	{
	704	kfree(sock->service_name);
	705
	706	skb_queue_purge(&sock->tx_queue);
	707	skb_queue_purge(&sock->tx_pending_queue);
	708	skb_queue_purge(&sock->tx_backlog_queue);
709
710	list_del_init(&sock->accept_queue);
c7aa1225	711	list_del_init(&sock->list);
40c75f81	712
d646960f	713	sock->parent = NULL;
c7aa1225 SO	714
c7aa1225 SO	715	nfc_llcp_local_put(sock->local);
d646960f SO	716	}
	717
	718	static int llcp_sock_create(struct net net, struct socket sock,
427a2eb1	719	const struct nfc_protocol *nfc_proto)
d646960f SO	720	{
	721	struct sock *sk;
	722
	723	pr_debug("%p\n", sock);
	724
	725	if (sock->type != SOCK_STREAM && sock->type != SOCK_DGRAM)
	726	return -ESOCKTNOSUPPORT;
	727
	728	sock->ops = &llcp_sock_ops;
	729
	730	sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
	731	if (sk == NULL)
	732	return -ENOMEM;
	733
	734	return 0;
	735	}
	736
	737	static const struct nfc_protocol llcp_nfc_proto = {
	738	.id = NFC_SOCKPROTO_LLCP,
	739	.proto = &llcp_sock_proto,
	740	.owner = THIS_MODULE,
	741	.create = llcp_sock_create
	742	};
	743
	744	int __init nfc_llcp_sock_init(void)
	745	{
	746	return nfc_proto_register(&llcp_nfc_proto);
	747	}
	748
	749	void nfc_llcp_sock_exit(void)
	750	{
	751	nfc_proto_unregister(&llcp_nfc_proto);
	752	}