[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_SAP_MAX) {
		ret = -EADDRINUSE;
		goto put_dev;
	}

	llcp_sock->reserved_ssap = llcp_sock->ssap;

	nfc_llcp_sock_link(&local->sockets, sk);

	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 *uaddr,
			     int *len, int peer)
{
	struct sock *sk = sock->sk;
	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);

	pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
		 llcp_sock->dsap, llcp_sock->ssap);

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

	uaddr->sa_family = AF_NFC;

	*len = sizeof(struct sockaddr_nfc_llcp);

	llcp_addr->dev_idx = llcp_sock->dev->idx;
	llcp_addr->target_idx = llcp_sock->target_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;
	}

	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);
		}
	}

	if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
		nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);

	release_sock(sk);

	nfc_llcp_sock_unlink(&local->sockets, 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->miu = llcp_sock->local->remote_miu;
	llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
	if (llcp_sock->ssap == LLCP_SAP_MAX) {
		ret = -ENOMEM;
		goto put_dev;
	}

	llcp_sock->reserved_ssap = llcp_sock->ssap;

	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);

	nfc_llcp_sock_link(&local->connecting_sockets, sk);

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

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

	release_sock(sk);

	return 0;

sock_unlink:
	nfc_llcp_put_ssap(local, llcp_sock->ssap);

	nfc_llcp_sock_unlink(&local->connecting_sockets, sk);

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->rw = LLCP_DEFAULT_RW;
	llcp_sock->miu = LLCP_DEFAULT_MIU;
	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;
	llcp_sock->reserved_ssap = LLCP_SAP_MAX;
	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->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);

	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
d646960f SO	123	llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock);
8b7e8eda SO	124	if (llcp_sock->ssap == LLCP_SAP_MAX) {
8b7e8eda SO	125	ret = -EADDRINUSE;
d646960f	126	goto put_dev;
8b7e8eda	127	}
d646960f	128
cbbf4721 SO	129	llcp_sock->reserved_ssap = llcp_sock->ssap;
cbbf4721 SO	130
a69f32af	131	nfc_llcp_sock_link(&local->sockets, sk);
d646960f SO	132
	133	pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap);
	134
	135	sk->sk_state = LLCP_BOUND;
	136
	137	put_dev:
	138	nfc_put_device(dev);
	139
	140	error:
	141	release_sock(sk);
	142	return ret;
	143	}
	144
	145	static int llcp_sock_listen(struct socket *sock, int backlog)
	146	{
	147	struct sock *sk = sock->sk;
	148	int ret = 0;
	149
	150	pr_debug("sk %p backlog %d\n", sk, backlog);
	151
	152	lock_sock(sk);
	153
	154	if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM)
427a2eb1	155	\|\| sk->sk_state != LLCP_BOUND) {
d646960f SO	156	ret = -EBADFD;
	157	goto error;
	158	}
	159
	160	sk->sk_max_ack_backlog = backlog;
	161	sk->sk_ack_backlog = 0;
	162
	163	pr_debug("Socket listening\n");
	164	sk->sk_state = LLCP_LISTEN;
	165
	166	error:
	167	release_sock(sk);
	168
	169	return ret;
	170	}
	171
	172	void nfc_llcp_accept_unlink(struct sock *sk)
	173	{
	174	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	175
	176	pr_debug("state %d\n", sk->sk_state);
	177
	178	list_del_init(&llcp_sock->accept_queue);
	179	sk_acceptq_removed(llcp_sock->parent);
	180	llcp_sock->parent = NULL;
	181
	182	sock_put(sk);
	183	}
	184
	185	void nfc_llcp_accept_enqueue(struct sock parent, struct sock sk)
	186	{
	187	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	188	struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
	189
	190	/* Lock will be free from unlink */
	191	sock_hold(sk);
	192
	193	list_add_tail(&llcp_sock->accept_queue,
427a2eb1	194	&llcp_sock_parent->accept_queue);
d646960f SO	195	llcp_sock->parent = parent;
	196	sk_acceptq_added(parent);
	197	}
	198
	199	struct sock nfc_llcp_accept_dequeue(struct sock parent,
427a2eb1	200	struct socket *newsock)
d646960f SO	201	{
	202	struct nfc_llcp_sock lsk, n, *llcp_parent;
	203	struct sock *sk;
	204
	205	llcp_parent = nfc_llcp_sock(parent);
	206
	207	list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
427a2eb1	208	accept_queue) {
d646960f SO	209	sk = &lsk->sk;
	210	lock_sock(sk);
	211
	212	if (sk->sk_state == LLCP_CLOSED) {
	213	release_sock(sk);
	214	nfc_llcp_accept_unlink(sk);
	215	continue;
	216	}
	217
	218	if (sk->sk_state == LLCP_CONNECTED \|\| !newsock) {
	219	nfc_llcp_accept_unlink(sk);
	220	if (newsock)
	221	sock_graft(sk, newsock);
	222
	223	release_sock(sk);
	224
	225	pr_debug("Returning sk state %d\n", sk->sk_state);
	226
	227	return sk;
	228	}
	229
	230	release_sock(sk);
	231	}
	232
	233	return NULL;
	234	}
	235
	236	static int llcp_sock_accept(struct socket sock, struct socket newsock,
427a2eb1	237	int flags)
d646960f SO	238	{
	239	DECLARE_WAITQUEUE(wait, current);
	240	struct sock sk = sock->sk, new_sk;
	241	long timeo;
	242	int ret = 0;
	243
	244	pr_debug("parent %p\n", sk);
	245
	246	lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
	247
	248	if (sk->sk_state != LLCP_LISTEN) {
	249	ret = -EBADFD;
	250	goto error;
	251	}
	252
	253	timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
	254
	255	/* Wait for an incoming connection. */
	256	add_wait_queue_exclusive(sk_sleep(sk), &wait);
	257	while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
	258	set_current_state(TASK_INTERRUPTIBLE);
	259
	260	if (!timeo) {
	261	ret = -EAGAIN;
	262	break;
	263	}
	264
	265	if (signal_pending(current)) {
	266	ret = sock_intr_errno(timeo);
	267	break;
	268	}
	269
	270	release_sock(sk);
	271	timeo = schedule_timeout(timeo);
	272	lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
	273	}
	274	__set_current_state(TASK_RUNNING);
	275	remove_wait_queue(sk_sleep(sk), &wait);
	276
	277	if (ret)
	278	goto error;
	279
	280	newsock->state = SS_CONNECTED;
	281
	282	pr_debug("new socket %p\n", new_sk);
	283
	284	error:
	285	release_sock(sk);
	286
	287	return ret;
	288	}
	289
12e5bdfe	290	static int llcp_sock_getname(struct socket sock, struct sockaddr uaddr,
d646960f SO	291	int *len, int peer)
d646960f SO	292	{
d646960f SO	293	struct sock *sk = sock->sk;
d646960f SO	294	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
12e5bdfe	295	DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
d646960f	296
12e5bdfe SO	297	pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
12e5bdfe SO	298	llcp_sock->dsap, llcp_sock->ssap);
d646960f	299
147f20e3	300	if (llcp_sock == NULL \|\| llcp_sock->dev == NULL)
58d1eab7 SL	301	return -EBADFD;
58d1eab7 SL	302
12e5bdfe SO	303	uaddr->sa_family = AF_NFC;
12e5bdfe SO	304
d646960f SO	305	*len = sizeof(struct sockaddr_nfc_llcp);
	306
	307	llcp_addr->dev_idx = llcp_sock->dev->idx;
12e5bdfe	308	llcp_addr->target_idx = llcp_sock->target_idx;
d646960f SO	309	llcp_addr->dsap = llcp_sock->dsap;
	310	llcp_addr->ssap = llcp_sock->ssap;
	311	llcp_addr->service_name_len = llcp_sock->service_name_len;
	312	memcpy(llcp_addr->service_name, llcp_sock->service_name,
427a2eb1	313	llcp_addr->service_name_len);
d646960f SO	314
	315	return 0;
	316	}
	317
	318	static inline unsigned int llcp_accept_poll(struct sock *parent)
	319	{
	320	struct nfc_llcp_sock llcp_sock, n, *parent_sock;
	321	struct sock *sk;
	322
	323	parent_sock = nfc_llcp_sock(parent);
	324
	325	list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue,
427a2eb1	326	accept_queue) {
d646960f SO	327	sk = &llcp_sock->sk;
	328
	329	if (sk->sk_state == LLCP_CONNECTED)
	330	return POLLIN \| POLLRDNORM;
	331	}
	332
	333	return 0;
	334	}
	335
	336	static unsigned int llcp_sock_poll(struct file file, struct socket sock,
427a2eb1	337	poll_table *wait)
d646960f SO	338	{
	339	struct sock *sk = sock->sk;
	340	unsigned int mask = 0;
	341
	342	pr_debug("%p\n", sk);
	343
	344	sock_poll_wait(file, sk_sleep(sk), wait);
	345
	346	if (sk->sk_state == LLCP_LISTEN)
	347	return llcp_accept_poll(sk);
	348
	349	if (sk->sk_err \|\| !skb_queue_empty(&sk->sk_error_queue))
	350	mask \|= POLLERR;
	351
	352	if (!skb_queue_empty(&sk->sk_receive_queue))
4260c13b	353	mask \|= POLLIN \| POLLRDNORM;
d646960f SO	354
	355	if (sk->sk_state == LLCP_CLOSED)
	356	mask \|= POLLHUP;
	357
4260c13b SO	358	if (sk->sk_shutdown & RCV_SHUTDOWN)
	359	mask \|= POLLRDHUP \| POLLIN \| POLLRDNORM;
	360
	361	if (sk->sk_shutdown == SHUTDOWN_MASK)
	362	mask \|= POLLHUP;
	363
	364	if (sock_writeable(sk))
	365	mask \|= POLLOUT \| POLLWRNORM \| POLLWRBAND;
	366	else
	367	set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
	368
	369	pr_debug("mask 0x%x\n", mask);
	370
d646960f SO	371	return mask;
	372	}
	373
	374	static int llcp_sock_release(struct socket *sock)
	375	{
	376	struct sock *sk = sock->sk;
	377	struct nfc_llcp_local *local;
	378	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
40c75f81	379	int err = 0;
d646960f SO	380
	381	if (!sk)
	382	return 0;
	383
	384	pr_debug("%p\n", sk);
	385
	386	local = llcp_sock->local;
40c75f81 SO	387	if (local == NULL) {
	388	err = -ENODEV;
	389	goto out;
	390	}
d646960f	391
d646960f SO	392	lock_sock(sk);
	393
	394	/* Send a DISC */
	395	if (sk->sk_state == LLCP_CONNECTED)
	396	nfc_llcp_disconnect(llcp_sock);
	397
	398	if (sk->sk_state == LLCP_LISTEN) {
	399	struct nfc_llcp_sock lsk, n;
	400	struct sock *accept_sk;
	401
	402	list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
427a2eb1	403	accept_queue) {
d646960f SO	404	accept_sk = &lsk->sk;
	405	lock_sock(accept_sk);
	406
	407	nfc_llcp_disconnect(lsk);
	408	nfc_llcp_accept_unlink(accept_sk);
	409
	410	release_sock(accept_sk);
	411
d646960f	412	sock_orphan(accept_sk);
d646960f SO	413	}
	414	}
	415
cbbf4721 SO	416	if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
cbbf4721 SO	417	nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
d646960f	418
d646960f SO	419	release_sock(sk);
d646960f SO	420
a69f32af SO	421	nfc_llcp_sock_unlink(&local->sockets, sk);
a69f32af 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);
93d7e490	491	llcp_sock->miu = llcp_sock->local->remote_miu;
d646960f SO	492	llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
	493	if (llcp_sock->ssap == LLCP_SAP_MAX) {
	494	ret = -ENOMEM;
	495	goto put_dev;
	496	}
cbbf4721 SO	497
	498	llcp_sock->reserved_ssap = llcp_sock->ssap;
	499
d646960f SO	500	if (addr->service_name_len == 0)
	501	llcp_sock->dsap = addr->dsap;
	502	else
	503	llcp_sock->dsap = LLCP_SAP_SDP;
	504	llcp_sock->nfc_protocol = addr->nfc_protocol;
	505	llcp_sock->service_name_len = min_t(unsigned int,
427a2eb1 SO	506	addr->service_name_len,
427a2eb1 SO	507	NFC_LLCP_MAX_SERVICE_NAME);
d646960f	508	llcp_sock->service_name = kmemdup(addr->service_name,
427a2eb1 SO	509	llcp_sock->service_name_len,
427a2eb1 SO	510	GFP_KERNEL);
d646960f	511
a69f32af	512	nfc_llcp_sock_link(&local->connecting_sockets, sk);
d646960f SO	513
	514	ret = nfc_llcp_send_connect(llcp_sock);
	515	if (ret)
a69f32af	516	goto sock_unlink;
d646960f	517
ff353d86 SO	518	ret = sock_wait_state(sk, LLCP_CONNECTED,
	519	sock_sndtimeo(sk, flags & O_NONBLOCK));
	520	if (ret)
a69f32af	521	goto sock_unlink;
d646960f SO	522
d646960f SO	523	release_sock(sk);
ff353d86	524
d646960f SO	525	return 0;
d646960f SO	526
a69f32af SO	527	sock_unlink:
	528	nfc_llcp_put_ssap(local, llcp_sock->ssap);
	529
	530	nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
	531
d646960f SO	532	put_dev:
	533	nfc_put_device(dev);
	534
	535	error:
	536	release_sock(sk);
	537	return ret;
	538	}
	539
53a0ac2e	540	static int llcp_sock_sendmsg(struct kiocb iocb, struct socket sock,
427a2eb1	541	struct msghdr *msg, size_t len)
53a0ac2e SO	542	{
	543	struct sock *sk = sock->sk;
	544	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	545	int ret;
	546
	547	pr_debug("sock %p sk %p", sock, sk);
	548
	549	ret = sock_error(sk);
	550	if (ret)
	551	return ret;
	552
	553	if (msg->msg_flags & MSG_OOB)
	554	return -EOPNOTSUPP;
	555
	556	lock_sock(sk);
	557
	558	if (sk->sk_state != LLCP_CONNECTED) {
	559	release_sock(sk);
	560	return -ENOTCONN;
	561	}
	562
	563	release_sock(sk);
	564
	565	return nfc_llcp_send_i_frame(llcp_sock, msg, len);
	566	}
	567
d646960f SO	568	static int llcp_sock_recvmsg(struct kiocb iocb, struct socket sock,
	569	struct msghdr *msg, size_t len, int flags)
	570	{
	571	int noblock = flags & MSG_DONTWAIT;
	572	struct sock *sk = sock->sk;
	573	unsigned int copied, rlen;
	574	struct sk_buff skb, cskb;
	575	int err = 0;
	576
	577	pr_debug("%p %zu\n", sk, len);
	578
	579	lock_sock(sk);
	580
	581	if (sk->sk_state == LLCP_CLOSED &&
427a2eb1	582	skb_queue_empty(&sk->sk_receive_queue)) {
d646960f SO	583	release_sock(sk);
	584	return 0;
	585	}
	586
	587	release_sock(sk);
	588
	589	if (flags & (MSG_OOB))
	590	return -EOPNOTSUPP;
	591
	592	skb = skb_recv_datagram(sk, flags, noblock, &err);
	593	if (!skb) {
	594	pr_err("Recv datagram failed state %d %d %d",
427a2eb1	595	sk->sk_state, err, sock_error(sk));
d646960f SO	596
	597	if (sk->sk_shutdown & RCV_SHUTDOWN)
	598	return 0;
	599
	600	return err;
	601	}
	602
427a2eb1	603	rlen = skb->len; /* real length of skb */
d646960f SO	604	copied = min_t(unsigned int, rlen, len);
	605
	606	cskb = skb;
	607	if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
	608	if (!(flags & MSG_PEEK))
	609	skb_queue_head(&sk->sk_receive_queue, skb);
	610	return -EFAULT;
	611	}
	612
	613	/* Mark read part of skb as used */
	614	if (!(flags & MSG_PEEK)) {
	615
	616	/* SOCK_STREAM: re-queue skb if it contains unreceived data */
	617	if (sk->sk_type == SOCK_STREAM) {
	618	skb_pull(skb, copied);
	619	if (skb->len) {
	620	skb_queue_head(&sk->sk_receive_queue, skb);
	621	goto done;
	622	}
	623	}
	624
	625	kfree_skb(skb);
	626	}
	627
	628	/* XXX Queue backlogged skbs */
	629
	630	done:
	631	/* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
	632	if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
	633	copied = rlen;
	634
	635	return copied;
	636	}
	637
	638	static const struct proto_ops llcp_sock_ops = {
	639	.family = PF_NFC,
	640	.owner = THIS_MODULE,
	641	.bind = llcp_sock_bind,
	642	.connect = llcp_sock_connect,
	643	.release = llcp_sock_release,
	644	.socketpair = sock_no_socketpair,
	645	.accept = llcp_sock_accept,
	646	.getname = llcp_sock_getname,
	647	.poll = llcp_sock_poll,
	648	.ioctl = sock_no_ioctl,
	649	.listen = llcp_sock_listen,
	650	.shutdown = sock_no_shutdown,
	651	.setsockopt = sock_no_setsockopt,
	652	.getsockopt = sock_no_getsockopt,
53a0ac2e	653	.sendmsg = llcp_sock_sendmsg,
d646960f SO	654	.recvmsg = llcp_sock_recvmsg,
	655	.mmap = sock_no_mmap,
	656	};
	657
	658	static void llcp_sock_destruct(struct sock *sk)
	659	{
	660	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	661
	662	pr_debug("%p\n", sk);
	663
	664	if (sk->sk_state == LLCP_CONNECTED)
	665	nfc_put_device(llcp_sock->dev);
	666
	667	skb_queue_purge(&sk->sk_receive_queue);
	668
	669	nfc_llcp_sock_free(llcp_sock);
	670
	671	if (!sock_flag(sk, SOCK_DEAD)) {
	672	pr_err("Freeing alive NFC LLCP socket %p\n", sk);
	673	return;
	674	}
	675	}
	676
	677	struct sock nfc_llcp_sock_alloc(struct socket sock, int type, gfp_t gfp)
	678	{
	679	struct sock *sk;
	680	struct nfc_llcp_sock *llcp_sock;
	681
	682	sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
	683	if (!sk)
	684	return NULL;
	685
	686	llcp_sock = nfc_llcp_sock(sk);
	687
	688	sock_init_data(sock, sk);
	689	sk->sk_state = LLCP_CLOSED;
	690	sk->sk_protocol = NFC_SOCKPROTO_LLCP;
	691	sk->sk_type = type;
	692	sk->sk_destruct = llcp_sock_destruct;
	693
	694	llcp_sock->ssap = 0;
	695	llcp_sock->dsap = LLCP_SAP_SDP;
7a06e586	696	llcp_sock->rw = LLCP_DEFAULT_RW;
93d7e490	697	llcp_sock->miu = LLCP_DEFAULT_MIU;
d646960f SO	698	llcp_sock->send_n = llcp_sock->send_ack_n = 0;
	699	llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
	700	llcp_sock->remote_ready = 1;
cbbf4721	701	llcp_sock->reserved_ssap = LLCP_SAP_MAX;
d646960f SO	702	skb_queue_head_init(&llcp_sock->tx_queue);
	703	skb_queue_head_init(&llcp_sock->tx_pending_queue);
	704	skb_queue_head_init(&llcp_sock->tx_backlog_queue);
d646960f SO	705	INIT_LIST_HEAD(&llcp_sock->accept_queue);
	706
	707	if (sock != NULL)
	708	sock->state = SS_UNCONNECTED;
	709
	710	return sk;
	711	}
	712
	713	void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
	714	{
	715	kfree(sock->service_name);
	716
	717	skb_queue_purge(&sock->tx_queue);
	718	skb_queue_purge(&sock->tx_pending_queue);
	719	skb_queue_purge(&sock->tx_backlog_queue);
	720
	721	list_del_init(&sock->accept_queue);
40c75f81	722
d646960f	723	sock->parent = NULL;
c7aa1225 SO	724
c7aa1225 SO	725	nfc_llcp_local_put(sock->local);
d646960f SO	726	}
	727
	728	static int llcp_sock_create(struct net net, struct socket sock,
427a2eb1	729	const struct nfc_protocol *nfc_proto)
d646960f SO	730	{
	731	struct sock *sk;
	732
	733	pr_debug("%p\n", sock);
	734
	735	if (sock->type != SOCK_STREAM && sock->type != SOCK_DGRAM)
	736	return -ESOCKTNOSUPPORT;
	737
	738	sock->ops = &llcp_sock_ops;
	739
	740	sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
	741	if (sk == NULL)
	742	return -ENOMEM;
	743
	744	return 0;
	745	}
	746
	747	static const struct nfc_protocol llcp_nfc_proto = {
	748	.id = NFC_SOCKPROTO_LLCP,
	749	.proto = &llcp_sock_proto,
	750	.owner = THIS_MODULE,
	751	.create = llcp_sock_create
	752	};
	753
	754	int __init nfc_llcp_sock_init(void)
	755	{
	756	return nfc_proto_register(&llcp_nfc_proto);
	757	}
	758
	759	void nfc_llcp_sock_exit(void)
	760	{
	761	nfc_proto_unregister(&llcp_nfc_proto);
	762	}