[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 = 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);

	if (llcp_sock == NULL || llcp_sock->dev == NULL)
		return -EBADFD;

	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 = 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)
{
	struct nfc_llcp_local *local = sock->local;

	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);

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

	sock->parent = NULL;
}

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;
	114	llcp_sock->local = local;
	115	llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
	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
147f20e3	295	if (llcp_sock == NULL \|\| llcp_sock->dev == NULL)
58d1eab7 SL	296	return -EBADFD;
58d1eab7 SL	297
d646960f SO	298	addr->sa_family = AF_NFC;
	299	*len = sizeof(struct sockaddr_nfc_llcp);
	300
	301	llcp_addr->dev_idx = llcp_sock->dev->idx;
	302	llcp_addr->dsap = llcp_sock->dsap;
	303	llcp_addr->ssap = llcp_sock->ssap;
	304	llcp_addr->service_name_len = llcp_sock->service_name_len;
	305	memcpy(llcp_addr->service_name, llcp_sock->service_name,
427a2eb1	306	llcp_addr->service_name_len);
d646960f SO	307
	308	return 0;
	309	}
	310
	311	static inline unsigned int llcp_accept_poll(struct sock *parent)
	312	{
	313	struct nfc_llcp_sock llcp_sock, n, *parent_sock;
	314	struct sock *sk;
	315
	316	parent_sock = nfc_llcp_sock(parent);
	317
	318	list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue,
427a2eb1	319	accept_queue) {
d646960f SO	320	sk = &llcp_sock->sk;
	321
	322	if (sk->sk_state == LLCP_CONNECTED)
	323	return POLLIN \| POLLRDNORM;
	324	}
	325
	326	return 0;
	327	}
	328
	329	static unsigned int llcp_sock_poll(struct file file, struct socket sock,
427a2eb1	330	poll_table *wait)
d646960f SO	331	{
	332	struct sock *sk = sock->sk;
	333	unsigned int mask = 0;
	334
	335	pr_debug("%p\n", sk);
	336
	337	sock_poll_wait(file, sk_sleep(sk), wait);
	338
	339	if (sk->sk_state == LLCP_LISTEN)
	340	return llcp_accept_poll(sk);
	341
	342	if (sk->sk_err \|\| !skb_queue_empty(&sk->sk_error_queue))
	343	mask \|= POLLERR;
	344
	345	if (!skb_queue_empty(&sk->sk_receive_queue))
4260c13b	346	mask \|= POLLIN \| POLLRDNORM;
d646960f SO	347
	348	if (sk->sk_state == LLCP_CLOSED)
	349	mask \|= POLLHUP;
	350
4260c13b SO	351	if (sk->sk_shutdown & RCV_SHUTDOWN)
	352	mask \|= POLLRDHUP \| POLLIN \| POLLRDNORM;
	353
	354	if (sk->sk_shutdown == SHUTDOWN_MASK)
	355	mask \|= POLLHUP;
	356
	357	if (sock_writeable(sk))
	358	mask \|= POLLOUT \| POLLWRNORM \| POLLWRBAND;
	359	else
	360	set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
	361
	362	pr_debug("mask 0x%x\n", mask);
	363
d646960f SO	364	return mask;
	365	}
	366
	367	static int llcp_sock_release(struct socket *sock)
	368	{
	369	struct sock *sk = sock->sk;
	370	struct nfc_llcp_local *local;
	371	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
40c75f81	372	int err = 0;
d646960f SO	373
	374	if (!sk)
	375	return 0;
	376
	377	pr_debug("%p\n", sk);
	378
	379	local = llcp_sock->local;
40c75f81 SO	380	if (local == NULL) {
	381	err = -ENODEV;
	382	goto out;
	383	}
d646960f SO	384
	385	mutex_lock(&local->socket_lock);
	386
0c318359	387	if (llcp_sock == local->sockets[llcp_sock->ssap])
d646960f	388	local->sockets[llcp_sock->ssap] = NULL;
0c318359	389	else
40c75f81	390	list_del_init(&llcp_sock->list);
d646960f SO	391
	392	mutex_unlock(&local->socket_lock);
	393
	394	lock_sock(sk);
	395
	396	/* Send a DISC */
	397	if (sk->sk_state == LLCP_CONNECTED)
	398	nfc_llcp_disconnect(llcp_sock);
	399
	400	if (sk->sk_state == LLCP_LISTEN) {
	401	struct nfc_llcp_sock lsk, n;
	402	struct sock *accept_sk;
	403
	404	list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
427a2eb1	405	accept_queue) {
d646960f SO	406	accept_sk = &lsk->sk;
	407	lock_sock(accept_sk);
	408
	409	nfc_llcp_disconnect(lsk);
	410	nfc_llcp_accept_unlink(accept_sk);
	411
	412	release_sock(accept_sk);
	413
d646960f	414	sock_orphan(accept_sk);
d646960f SO	415	}
	416	}
	417
	418	/* Freeing the SAP */
	419	if ((sk->sk_state == LLCP_CONNECTED
427a2eb1 SO	420	&& llcp_sock->ssap > LLCP_LOCAL_SAP_OFFSET) \|\|
427a2eb1 SO	421	sk->sk_state == LLCP_BOUND \|\| sk->sk_state == LLCP_LISTEN)
d646960f SO	422	nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
d646960f SO	423
d646960f SO	424	release_sock(sk);
d646960f SO	425
40c75f81	426	out:
d646960f SO	427	sock_orphan(sk);
	428	sock_put(sk);
	429
40c75f81	430	return err;
d646960f SO	431	}
	432
	433	static int llcp_sock_connect(struct socket sock, struct sockaddr _addr,
427a2eb1	434	int len, int flags)
d646960f SO	435	{
	436	struct sock *sk = sock->sk;
	437	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	438	struct sockaddr_nfc_llcp addr = (struct sockaddr_nfc_llcp )_addr;
	439	struct nfc_dev *dev;
	440	struct nfc_llcp_local *local;
	441	int ret = 0;
	442
	443	pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
	444
	445	if (!addr \|\| len < sizeof(struct sockaddr_nfc) \|\|
427a2eb1	446	addr->sa_family != AF_NFC) {
d646960f SO	447	pr_err("Invalid socket\n");
	448	return -EINVAL;
	449	}
	450
	451	if (addr->service_name_len == 0 && addr->dsap == 0) {
	452	pr_err("Missing service name or dsap\n");
	453	return -EINVAL;
	454	}
	455
	456	pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
427a2eb1	457	addr->target_idx, addr->nfc_protocol);
d646960f SO	458
	459	lock_sock(sk);
	460
	461	if (sk->sk_state == LLCP_CONNECTED) {
	462	ret = -EISCONN;
	463	goto error;
	464	}
	465
	466	dev = nfc_get_device(addr->dev_idx);
	467	if (dev == NULL) {
	468	ret = -ENODEV;
	469	goto error;
	470	}
	471
	472	local = nfc_llcp_find_local(dev);
	473	if (local == NULL) {
	474	ret = -ENODEV;
	475	goto put_dev;
	476	}
	477
	478	device_lock(&dev->dev);
	479	if (dev->dep_link_up == false) {
	480	ret = -ENOLINK;
	481	device_unlock(&dev->dev);
	482	goto put_dev;
	483	}
	484	device_unlock(&dev->dev);
	485
	486	if (local->rf_mode == NFC_RF_INITIATOR &&
427a2eb1	487	addr->target_idx != local->target_idx) {
d646960f SO	488	ret = -ENOLINK;
	489	goto put_dev;
	490	}
	491
	492	llcp_sock->dev = dev;
	493	llcp_sock->local = local;
	494	llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
	495	if (llcp_sock->ssap == LLCP_SAP_MAX) {
	496	ret = -ENOMEM;
	497	goto put_dev;
	498	}
	499	if (addr->service_name_len == 0)
	500	llcp_sock->dsap = addr->dsap;
	501	else
	502	llcp_sock->dsap = LLCP_SAP_SDP;
	503	llcp_sock->nfc_protocol = addr->nfc_protocol;
	504	llcp_sock->service_name_len = min_t(unsigned int,
427a2eb1 SO	505	addr->service_name_len,
427a2eb1 SO	506	NFC_LLCP_MAX_SERVICE_NAME);
d646960f	507	llcp_sock->service_name = kmemdup(addr->service_name,
427a2eb1 SO	508	llcp_sock->service_name_len,
427a2eb1 SO	509	GFP_KERNEL);
d646960f SO	510
	511	local->sockets[llcp_sock->ssap] = llcp_sock;
	512
	513	ret = nfc_llcp_send_connect(llcp_sock);
	514	if (ret)
	515	goto put_dev;
	516
ff353d86 SO	517	ret = sock_wait_state(sk, LLCP_CONNECTED,
	518	sock_sndtimeo(sk, flags & O_NONBLOCK));
	519	if (ret)
	520	goto put_dev;
d646960f SO	521
d646960f SO	522	release_sock(sk);
ff353d86	523
d646960f SO	524	return 0;
	525
	526	put_dev:
	527	nfc_put_device(dev);
	528
	529	error:
	530	release_sock(sk);
	531	return ret;
	532	}
	533
53a0ac2e	534	static int llcp_sock_sendmsg(struct kiocb iocb, struct socket sock,
427a2eb1	535	struct msghdr *msg, size_t len)
53a0ac2e SO	536	{
	537	struct sock *sk = sock->sk;
	538	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	539	int ret;
	540
	541	pr_debug("sock %p sk %p", sock, sk);
	542
	543	ret = sock_error(sk);
	544	if (ret)
	545	return ret;
	546
	547	if (msg->msg_flags & MSG_OOB)
	548	return -EOPNOTSUPP;
	549
	550	lock_sock(sk);
	551
	552	if (sk->sk_state != LLCP_CONNECTED) {
	553	release_sock(sk);
	554	return -ENOTCONN;
	555	}
	556
	557	release_sock(sk);
	558
	559	return nfc_llcp_send_i_frame(llcp_sock, msg, len);
	560	}
	561
d646960f SO	562	static int llcp_sock_recvmsg(struct kiocb iocb, struct socket sock,
	563	struct msghdr *msg, size_t len, int flags)
	564	{
	565	int noblock = flags & MSG_DONTWAIT;
	566	struct sock *sk = sock->sk;
	567	unsigned int copied, rlen;
	568	struct sk_buff skb, cskb;
	569	int err = 0;
	570
	571	pr_debug("%p %zu\n", sk, len);
	572
	573	lock_sock(sk);
	574
	575	if (sk->sk_state == LLCP_CLOSED &&
427a2eb1	576	skb_queue_empty(&sk->sk_receive_queue)) {
d646960f SO	577	release_sock(sk);
	578	return 0;
	579	}
	580
	581	release_sock(sk);
	582
	583	if (flags & (MSG_OOB))
	584	return -EOPNOTSUPP;
	585
	586	skb = skb_recv_datagram(sk, flags, noblock, &err);
	587	if (!skb) {
	588	pr_err("Recv datagram failed state %d %d %d",
427a2eb1	589	sk->sk_state, err, sock_error(sk));
d646960f SO	590
	591	if (sk->sk_shutdown & RCV_SHUTDOWN)
	592	return 0;
	593
	594	return err;
	595	}
	596
427a2eb1	597	rlen = skb->len; /* real length of skb */
d646960f SO	598	copied = min_t(unsigned int, rlen, len);
	599
	600	cskb = skb;
	601	if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
	602	if (!(flags & MSG_PEEK))
	603	skb_queue_head(&sk->sk_receive_queue, skb);
	604	return -EFAULT;
	605	}
	606
	607	/* Mark read part of skb as used */
	608	if (!(flags & MSG_PEEK)) {
	609
	610	/* SOCK_STREAM: re-queue skb if it contains unreceived data */
	611	if (sk->sk_type == SOCK_STREAM) {
	612	skb_pull(skb, copied);
	613	if (skb->len) {
	614	skb_queue_head(&sk->sk_receive_queue, skb);
	615	goto done;
	616	}
	617	}
	618
	619	kfree_skb(skb);
	620	}
	621
	622	/* XXX Queue backlogged skbs */
	623
	624	done:
	625	/* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
	626	if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
	627	copied = rlen;
	628
	629	return copied;
	630	}
	631
	632	static const struct proto_ops llcp_sock_ops = {
	633	.family = PF_NFC,
	634	.owner = THIS_MODULE,
	635	.bind = llcp_sock_bind,
	636	.connect = llcp_sock_connect,
	637	.release = llcp_sock_release,
	638	.socketpair = sock_no_socketpair,
	639	.accept = llcp_sock_accept,
	640	.getname = llcp_sock_getname,
	641	.poll = llcp_sock_poll,
	642	.ioctl = sock_no_ioctl,
	643	.listen = llcp_sock_listen,
	644	.shutdown = sock_no_shutdown,
	645	.setsockopt = sock_no_setsockopt,
	646	.getsockopt = sock_no_getsockopt,
53a0ac2e	647	.sendmsg = llcp_sock_sendmsg,
d646960f SO	648	.recvmsg = llcp_sock_recvmsg,
	649	.mmap = sock_no_mmap,
	650	};
	651
	652	static void llcp_sock_destruct(struct sock *sk)
	653	{
	654	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	655
	656	pr_debug("%p\n", sk);
	657
	658	if (sk->sk_state == LLCP_CONNECTED)
	659	nfc_put_device(llcp_sock->dev);
	660
	661	skb_queue_purge(&sk->sk_receive_queue);
	662
	663	nfc_llcp_sock_free(llcp_sock);
	664
	665	if (!sock_flag(sk, SOCK_DEAD)) {
	666	pr_err("Freeing alive NFC LLCP socket %p\n", sk);
	667	return;
	668	}
	669	}
	670
	671	struct sock nfc_llcp_sock_alloc(struct socket sock, int type, gfp_t gfp)
	672	{
	673	struct sock *sk;
	674	struct nfc_llcp_sock *llcp_sock;
	675
	676	sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
	677	if (!sk)
	678	return NULL;
	679
	680	llcp_sock = nfc_llcp_sock(sk);
	681
	682	sock_init_data(sock, sk);
	683	sk->sk_state = LLCP_CLOSED;
	684	sk->sk_protocol = NFC_SOCKPROTO_LLCP;
	685	sk->sk_type = type;
	686	sk->sk_destruct = llcp_sock_destruct;
	687
	688	llcp_sock->ssap = 0;
	689	llcp_sock->dsap = LLCP_SAP_SDP;
	690	llcp_sock->send_n = llcp_sock->send_ack_n = 0;
	691	llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
	692	llcp_sock->remote_ready = 1;
	693	skb_queue_head_init(&llcp_sock->tx_queue);
	694	skb_queue_head_init(&llcp_sock->tx_pending_queue);
	695	skb_queue_head_init(&llcp_sock->tx_backlog_queue);
	696	INIT_LIST_HEAD(&llcp_sock->list);
	697	INIT_LIST_HEAD(&llcp_sock->accept_queue);
	698
	699	if (sock != NULL)
	700	sock->state = SS_UNCONNECTED;
	701
	702	return sk;
	703	}
	704
	705	void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
	706	{
40c75f81 SO	707	struct nfc_llcp_local *local = sock->local;
40c75f81 SO	708
d646960f SO	709	kfree(sock->service_name);
	710
	711	skb_queue_purge(&sock->tx_queue);
	712	skb_queue_purge(&sock->tx_pending_queue);
	713	skb_queue_purge(&sock->tx_backlog_queue);
	714
	715	list_del_init(&sock->accept_queue);
	716
40c75f81 SO	717	if (local != NULL && sock == local->sockets[sock->ssap])
	718	local->sockets[sock->ssap] = NULL;
	719	else
	720	list_del_init(&sock->list);
	721
d646960f SO	722	sock->parent = NULL;
	723	}
	724
	725	static int llcp_sock_create(struct net net, struct socket sock,
427a2eb1	726	const struct nfc_protocol *nfc_proto)
d646960f SO	727	{
	728	struct sock *sk;
	729
	730	pr_debug("%p\n", sock);
	731
	732	if (sock->type != SOCK_STREAM && sock->type != SOCK_DGRAM)
	733	return -ESOCKTNOSUPPORT;
	734
	735	sock->ops = &llcp_sock_ops;
	736
	737	sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
	738	if (sk == NULL)
	739	return -ENOMEM;
	740
	741	return 0;
	742	}
	743
	744	static const struct nfc_protocol llcp_nfc_proto = {
	745	.id = NFC_SOCKPROTO_LLCP,
	746	.proto = &llcp_sock_proto,
	747	.owner = THIS_MODULE,
	748	.create = llcp_sock_create
	749	};
	750
	751	int __init nfc_llcp_sock_init(void)
	752	{
	753	return nfc_proto_register(&llcp_nfc_proto);
	754	}
	755
	756	void nfc_llcp_sock_exit(void)
	757	{
	758	nfc_proto_unregister(&llcp_nfc_proto);
	759	}