[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;

	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
	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
cbbf4721 SO	127	llcp_sock->reserved_ssap = llcp_sock->ssap;
cbbf4721 SO	128
a69f32af	129	nfc_llcp_sock_link(&local->sockets, sk);
d646960f SO	130
	131	pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap);
	132
	133	sk->sk_state = LLCP_BOUND;
	134
	135	put_dev:
	136	nfc_put_device(dev);
	137
	138	error:
	139	release_sock(sk);
	140	return ret;
	141	}
	142
	143	static int llcp_sock_listen(struct socket *sock, int backlog)
	144	{
	145	struct sock *sk = sock->sk;
	146	int ret = 0;
	147
	148	pr_debug("sk %p backlog %d\n", sk, backlog);
	149
	150	lock_sock(sk);
	151
	152	if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM)
427a2eb1	153	\|\| sk->sk_state != LLCP_BOUND) {
d646960f SO	154	ret = -EBADFD;
	155	goto error;
	156	}
	157
	158	sk->sk_max_ack_backlog = backlog;
	159	sk->sk_ack_backlog = 0;
	160
	161	pr_debug("Socket listening\n");
	162	sk->sk_state = LLCP_LISTEN;
	163
	164	error:
	165	release_sock(sk);
	166
	167	return ret;
	168	}
	169
	170	void nfc_llcp_accept_unlink(struct sock *sk)
	171	{
	172	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	173
	174	pr_debug("state %d\n", sk->sk_state);
	175
	176	list_del_init(&llcp_sock->accept_queue);
	177	sk_acceptq_removed(llcp_sock->parent);
	178	llcp_sock->parent = NULL;
	179
	180	sock_put(sk);
	181	}
	182
	183	void nfc_llcp_accept_enqueue(struct sock parent, struct sock sk)
	184	{
	185	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	186	struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
	187
	188	/* Lock will be free from unlink */
	189	sock_hold(sk);
	190
	191	list_add_tail(&llcp_sock->accept_queue,
427a2eb1	192	&llcp_sock_parent->accept_queue);
d646960f SO	193	llcp_sock->parent = parent;
	194	sk_acceptq_added(parent);
	195	}
	196
	197	struct sock nfc_llcp_accept_dequeue(struct sock parent,
427a2eb1	198	struct socket *newsock)
d646960f SO	199	{
	200	struct nfc_llcp_sock lsk, n, *llcp_parent;
	201	struct sock *sk;
	202
	203	llcp_parent = nfc_llcp_sock(parent);
	204
	205	list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
427a2eb1	206	accept_queue) {
d646960f SO	207	sk = &lsk->sk;
	208	lock_sock(sk);
	209
	210	if (sk->sk_state == LLCP_CLOSED) {
	211	release_sock(sk);
	212	nfc_llcp_accept_unlink(sk);
	213	continue;
	214	}
	215
	216	if (sk->sk_state == LLCP_CONNECTED \|\| !newsock) {
	217	nfc_llcp_accept_unlink(sk);
	218	if (newsock)
	219	sock_graft(sk, newsock);
	220
	221	release_sock(sk);
	222
	223	pr_debug("Returning sk state %d\n", sk->sk_state);
	224
	225	return sk;
	226	}
	227
	228	release_sock(sk);
	229	}
	230
	231	return NULL;
	232	}
	233
	234	static int llcp_sock_accept(struct socket sock, struct socket newsock,
427a2eb1	235	int flags)
d646960f SO	236	{
	237	DECLARE_WAITQUEUE(wait, current);
	238	struct sock sk = sock->sk, new_sk;
	239	long timeo;
	240	int ret = 0;
	241
	242	pr_debug("parent %p\n", sk);
	243
	244	lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
	245
	246	if (sk->sk_state != LLCP_LISTEN) {
	247	ret = -EBADFD;
	248	goto error;
	249	}
	250
	251	timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
	252
	253	/* Wait for an incoming connection. */
	254	add_wait_queue_exclusive(sk_sleep(sk), &wait);
	255	while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
	256	set_current_state(TASK_INTERRUPTIBLE);
	257
	258	if (!timeo) {
	259	ret = -EAGAIN;
	260	break;
	261	}
	262
	263	if (signal_pending(current)) {
	264	ret = sock_intr_errno(timeo);
	265	break;
	266	}
	267
	268	release_sock(sk);
	269	timeo = schedule_timeout(timeo);
	270	lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
	271	}
	272	__set_current_state(TASK_RUNNING);
	273	remove_wait_queue(sk_sleep(sk), &wait);
	274
	275	if (ret)
	276	goto error;
	277
	278	newsock->state = SS_CONNECTED;
	279
	280	pr_debug("new socket %p\n", new_sk);
	281
	282	error:
	283	release_sock(sk);
	284
	285	return ret;
	286	}
	287
12e5bdfe	288	static int llcp_sock_getname(struct socket sock, struct sockaddr uaddr,
d646960f SO	289	int *len, int peer)
d646960f SO	290	{
d646960f SO	291	struct sock *sk = sock->sk;
d646960f SO	292	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
12e5bdfe	293	DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
d646960f	294
12e5bdfe SO	295	pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
12e5bdfe SO	296	llcp_sock->dsap, llcp_sock->ssap);
d646960f	297
147f20e3	298	if (llcp_sock == NULL \|\| llcp_sock->dev == NULL)
58d1eab7 SL	299	return -EBADFD;
58d1eab7 SL	300
12e5bdfe SO	301	uaddr->sa_family = AF_NFC;
12e5bdfe SO	302
d646960f SO	303	*len = sizeof(struct sockaddr_nfc_llcp);
	304
	305	llcp_addr->dev_idx = llcp_sock->dev->idx;
12e5bdfe	306	llcp_addr->target_idx = llcp_sock->target_idx;
d646960f SO	307	llcp_addr->dsap = llcp_sock->dsap;
	308	llcp_addr->ssap = llcp_sock->ssap;
	309	llcp_addr->service_name_len = llcp_sock->service_name_len;
	310	memcpy(llcp_addr->service_name, llcp_sock->service_name,
427a2eb1	311	llcp_addr->service_name_len);
d646960f SO	312
	313	return 0;
	314	}
	315
	316	static inline unsigned int llcp_accept_poll(struct sock *parent)
	317	{
	318	struct nfc_llcp_sock llcp_sock, n, *parent_sock;
	319	struct sock *sk;
	320
	321	parent_sock = nfc_llcp_sock(parent);
	322
	323	list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue,
427a2eb1	324	accept_queue) {
d646960f SO	325	sk = &llcp_sock->sk;
	326
	327	if (sk->sk_state == LLCP_CONNECTED)
	328	return POLLIN \| POLLRDNORM;
	329	}
	330
	331	return 0;
	332	}
	333
	334	static unsigned int llcp_sock_poll(struct file file, struct socket sock,
427a2eb1	335	poll_table *wait)
d646960f SO	336	{
	337	struct sock *sk = sock->sk;
	338	unsigned int mask = 0;
	339
	340	pr_debug("%p\n", sk);
	341
	342	sock_poll_wait(file, sk_sleep(sk), wait);
	343
	344	if (sk->sk_state == LLCP_LISTEN)
	345	return llcp_accept_poll(sk);
	346
	347	if (sk->sk_err \|\| !skb_queue_empty(&sk->sk_error_queue))
	348	mask \|= POLLERR;
	349
	350	if (!skb_queue_empty(&sk->sk_receive_queue))
4260c13b	351	mask \|= POLLIN \| POLLRDNORM;
d646960f SO	352
	353	if (sk->sk_state == LLCP_CLOSED)
	354	mask \|= POLLHUP;
	355
4260c13b SO	356	if (sk->sk_shutdown & RCV_SHUTDOWN)
	357	mask \|= POLLRDHUP \| POLLIN \| POLLRDNORM;
	358
	359	if (sk->sk_shutdown == SHUTDOWN_MASK)
	360	mask \|= POLLHUP;
	361
	362	if (sock_writeable(sk))
	363	mask \|= POLLOUT \| POLLWRNORM \| POLLWRBAND;
	364	else
	365	set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
	366
	367	pr_debug("mask 0x%x\n", mask);
	368
d646960f SO	369	return mask;
	370	}
	371
	372	static int llcp_sock_release(struct socket *sock)
	373	{
	374	struct sock *sk = sock->sk;
	375	struct nfc_llcp_local *local;
	376	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
40c75f81	377	int err = 0;
d646960f SO	378
	379	if (!sk)
	380	return 0;
	381
	382	pr_debug("%p\n", sk);
	383
	384	local = llcp_sock->local;
40c75f81 SO	385	if (local == NULL) {
	386	err = -ENODEV;
	387	goto out;
	388	}
d646960f	389
d646960f SO	390	lock_sock(sk);
	391
	392	/* Send a DISC */
	393	if (sk->sk_state == LLCP_CONNECTED)
	394	nfc_llcp_disconnect(llcp_sock);
	395
	396	if (sk->sk_state == LLCP_LISTEN) {
	397	struct nfc_llcp_sock lsk, n;
	398	struct sock *accept_sk;
	399
	400	list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
427a2eb1	401	accept_queue) {
d646960f SO	402	accept_sk = &lsk->sk;
	403	lock_sock(accept_sk);
	404
	405	nfc_llcp_disconnect(lsk);
	406	nfc_llcp_accept_unlink(accept_sk);
	407
	408	release_sock(accept_sk);
	409
d646960f	410	sock_orphan(accept_sk);
d646960f SO	411	}
	412	}
	413
cbbf4721 SO	414	if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
cbbf4721 SO	415	nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
d646960f	416
d646960f SO	417	release_sock(sk);
d646960f SO	418
a69f32af SO	419	nfc_llcp_sock_unlink(&local->sockets, sk);
a69f32af SO	420
40c75f81	421	out:
d646960f SO	422	sock_orphan(sk);
	423	sock_put(sk);
	424
40c75f81	425	return err;
d646960f SO	426	}
	427
	428	static int llcp_sock_connect(struct socket sock, struct sockaddr _addr,
427a2eb1	429	int len, int flags)
d646960f SO	430	{
	431	struct sock *sk = sock->sk;
	432	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	433	struct sockaddr_nfc_llcp addr = (struct sockaddr_nfc_llcp )_addr;
	434	struct nfc_dev *dev;
	435	struct nfc_llcp_local *local;
	436	int ret = 0;
	437
	438	pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
	439
	440	if (!addr \|\| len < sizeof(struct sockaddr_nfc) \|\|
427a2eb1	441	addr->sa_family != AF_NFC) {
d646960f SO	442	pr_err("Invalid socket\n");
	443	return -EINVAL;
	444	}
	445
	446	if (addr->service_name_len == 0 && addr->dsap == 0) {
	447	pr_err("Missing service name or dsap\n");
	448	return -EINVAL;
	449	}
	450
	451	pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
427a2eb1	452	addr->target_idx, addr->nfc_protocol);
d646960f SO	453
	454	lock_sock(sk);
	455
	456	if (sk->sk_state == LLCP_CONNECTED) {
	457	ret = -EISCONN;
	458	goto error;
	459	}
	460
	461	dev = nfc_get_device(addr->dev_idx);
	462	if (dev == NULL) {
	463	ret = -ENODEV;
	464	goto error;
	465	}
	466
	467	local = nfc_llcp_find_local(dev);
	468	if (local == NULL) {
	469	ret = -ENODEV;
	470	goto put_dev;
	471	}
	472
	473	device_lock(&dev->dev);
	474	if (dev->dep_link_up == false) {
	475	ret = -ENOLINK;
	476	device_unlock(&dev->dev);
	477	goto put_dev;
	478	}
	479	device_unlock(&dev->dev);
	480
	481	if (local->rf_mode == NFC_RF_INITIATOR &&
427a2eb1	482	addr->target_idx != local->target_idx) {
d646960f SO	483	ret = -ENOLINK;
	484	goto put_dev;
	485	}
	486
	487	llcp_sock->dev = dev;
c7aa1225	488	llcp_sock->local = nfc_llcp_local_get(local);
93d7e490	489	llcp_sock->miu = llcp_sock->local->remote_miu;
d646960f SO	490	llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
	491	if (llcp_sock->ssap == LLCP_SAP_MAX) {
	492	ret = -ENOMEM;
	493	goto put_dev;
	494	}
cbbf4721 SO	495
	496	llcp_sock->reserved_ssap = llcp_sock->ssap;
	497
d646960f SO	498	if (addr->service_name_len == 0)
	499	llcp_sock->dsap = addr->dsap;
	500	else
	501	llcp_sock->dsap = LLCP_SAP_SDP;
	502	llcp_sock->nfc_protocol = addr->nfc_protocol;
	503	llcp_sock->service_name_len = min_t(unsigned int,
427a2eb1 SO	504	addr->service_name_len,
427a2eb1 SO	505	NFC_LLCP_MAX_SERVICE_NAME);
d646960f	506	llcp_sock->service_name = kmemdup(addr->service_name,
427a2eb1 SO	507	llcp_sock->service_name_len,
427a2eb1 SO	508	GFP_KERNEL);
d646960f	509
a69f32af	510	nfc_llcp_sock_link(&local->connecting_sockets, sk);
d646960f SO	511
	512	ret = nfc_llcp_send_connect(llcp_sock);
	513	if (ret)
a69f32af	514	goto sock_unlink;
d646960f	515
ff353d86 SO	516	ret = sock_wait_state(sk, LLCP_CONNECTED,
	517	sock_sndtimeo(sk, flags & O_NONBLOCK));
	518	if (ret)
a69f32af	519	goto sock_unlink;
d646960f SO	520
d646960f SO	521	release_sock(sk);
ff353d86	522
d646960f SO	523	return 0;
d646960f SO	524
a69f32af SO	525	sock_unlink:
	526	nfc_llcp_put_ssap(local, llcp_sock->ssap);
	527
	528	nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
	529
d646960f SO	530	put_dev:
	531	nfc_put_device(dev);
	532
	533	error:
	534	release_sock(sk);
	535	return ret;
	536	}
	537
53a0ac2e	538	static int llcp_sock_sendmsg(struct kiocb iocb, struct socket sock,
427a2eb1	539	struct msghdr *msg, size_t len)
53a0ac2e SO	540	{
	541	struct sock *sk = sock->sk;
	542	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	543	int ret;
	544
	545	pr_debug("sock %p sk %p", sock, sk);
	546
	547	ret = sock_error(sk);
	548	if (ret)
	549	return ret;
	550
	551	if (msg->msg_flags & MSG_OOB)
	552	return -EOPNOTSUPP;
	553
	554	lock_sock(sk);
	555
	556	if (sk->sk_state != LLCP_CONNECTED) {
	557	release_sock(sk);
	558	return -ENOTCONN;
	559	}
	560
	561	release_sock(sk);
	562
	563	return nfc_llcp_send_i_frame(llcp_sock, msg, len);
	564	}
	565
d646960f SO	566	static int llcp_sock_recvmsg(struct kiocb iocb, struct socket sock,
	567	struct msghdr *msg, size_t len, int flags)
	568	{
	569	int noblock = flags & MSG_DONTWAIT;
	570	struct sock *sk = sock->sk;
	571	unsigned int copied, rlen;
	572	struct sk_buff skb, cskb;
	573	int err = 0;
	574
	575	pr_debug("%p %zu\n", sk, len);
	576
	577	lock_sock(sk);
	578
	579	if (sk->sk_state == LLCP_CLOSED &&
427a2eb1	580	skb_queue_empty(&sk->sk_receive_queue)) {
d646960f SO	581	release_sock(sk);
	582	return 0;
	583	}
	584
	585	release_sock(sk);
	586
	587	if (flags & (MSG_OOB))
	588	return -EOPNOTSUPP;
	589
	590	skb = skb_recv_datagram(sk, flags, noblock, &err);
	591	if (!skb) {
	592	pr_err("Recv datagram failed state %d %d %d",
427a2eb1	593	sk->sk_state, err, sock_error(sk));
d646960f SO	594
	595	if (sk->sk_shutdown & RCV_SHUTDOWN)
	596	return 0;
	597
	598	return err;
	599	}
	600
427a2eb1	601	rlen = skb->len; /* real length of skb */
d646960f SO	602	copied = min_t(unsigned int, rlen, len);
	603
	604	cskb = skb;
	605	if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
	606	if (!(flags & MSG_PEEK))
	607	skb_queue_head(&sk->sk_receive_queue, skb);
	608	return -EFAULT;
	609	}
	610
	611	/* Mark read part of skb as used */
	612	if (!(flags & MSG_PEEK)) {
	613
	614	/* SOCK_STREAM: re-queue skb if it contains unreceived data */
	615	if (sk->sk_type == SOCK_STREAM) {
	616	skb_pull(skb, copied);
	617	if (skb->len) {
	618	skb_queue_head(&sk->sk_receive_queue, skb);
	619	goto done;
	620	}
	621	}
	622
	623	kfree_skb(skb);
	624	}
	625
	626	/* XXX Queue backlogged skbs */
	627
	628	done:
	629	/* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
	630	if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
	631	copied = rlen;
	632
	633	return copied;
	634	}
	635
	636	static const struct proto_ops llcp_sock_ops = {
	637	.family = PF_NFC,
	638	.owner = THIS_MODULE,
	639	.bind = llcp_sock_bind,
	640	.connect = llcp_sock_connect,
	641	.release = llcp_sock_release,
	642	.socketpair = sock_no_socketpair,
	643	.accept = llcp_sock_accept,
	644	.getname = llcp_sock_getname,
	645	.poll = llcp_sock_poll,
	646	.ioctl = sock_no_ioctl,
	647	.listen = llcp_sock_listen,
	648	.shutdown = sock_no_shutdown,
	649	.setsockopt = sock_no_setsockopt,
	650	.getsockopt = sock_no_getsockopt,
53a0ac2e	651	.sendmsg = llcp_sock_sendmsg,
d646960f SO	652	.recvmsg = llcp_sock_recvmsg,
	653	.mmap = sock_no_mmap,
	654	};
	655
	656	static void llcp_sock_destruct(struct sock *sk)
	657	{
	658	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
	659
	660	pr_debug("%p\n", sk);
	661
	662	if (sk->sk_state == LLCP_CONNECTED)
	663	nfc_put_device(llcp_sock->dev);
	664
	665	skb_queue_purge(&sk->sk_receive_queue);
	666
	667	nfc_llcp_sock_free(llcp_sock);
	668
	669	if (!sock_flag(sk, SOCK_DEAD)) {
	670	pr_err("Freeing alive NFC LLCP socket %p\n", sk);
	671	return;
	672	}
	673	}
	674
	675	struct sock nfc_llcp_sock_alloc(struct socket sock, int type, gfp_t gfp)
	676	{
	677	struct sock *sk;
	678	struct nfc_llcp_sock *llcp_sock;
	679
	680	sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
	681	if (!sk)
	682	return NULL;
	683
	684	llcp_sock = nfc_llcp_sock(sk);
	685
	686	sock_init_data(sock, sk);
	687	sk->sk_state = LLCP_CLOSED;
	688	sk->sk_protocol = NFC_SOCKPROTO_LLCP;
	689	sk->sk_type = type;
	690	sk->sk_destruct = llcp_sock_destruct;
	691
	692	llcp_sock->ssap = 0;
	693	llcp_sock->dsap = LLCP_SAP_SDP;
7a06e586	694	llcp_sock->rw = LLCP_DEFAULT_RW;
93d7e490	695	llcp_sock->miu = LLCP_DEFAULT_MIU;
d646960f SO	696	llcp_sock->send_n = llcp_sock->send_ack_n = 0;
	697	llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
	698	llcp_sock->remote_ready = 1;
cbbf4721	699	llcp_sock->reserved_ssap = LLCP_SAP_MAX;
d646960f SO	700	skb_queue_head_init(&llcp_sock->tx_queue);
	701	skb_queue_head_init(&llcp_sock->tx_pending_queue);
	702	skb_queue_head_init(&llcp_sock->tx_backlog_queue);
d646960f SO	703	INIT_LIST_HEAD(&llcp_sock->accept_queue);
	704
	705	if (sock != NULL)
	706	sock->state = SS_UNCONNECTED;
	707
	708	return sk;
	709	}
	710
	711	void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
	712	{
	713	kfree(sock->service_name);
	714
	715	skb_queue_purge(&sock->tx_queue);
	716	skb_queue_purge(&sock->tx_pending_queue);
	717	skb_queue_purge(&sock->tx_backlog_queue);
	718
	719	list_del_init(&sock->accept_queue);
40c75f81	720
d646960f	721	sock->parent = NULL;
c7aa1225 SO	722
c7aa1225 SO	723	nfc_llcp_local_put(sock->local);
d646960f SO	724	}
	725
	726	static int llcp_sock_create(struct net net, struct socket sock,
427a2eb1	727	const struct nfc_protocol *nfc_proto)
d646960f SO	728	{
	729	struct sock *sk;
	730
	731	pr_debug("%p\n", sock);
	732
	733	if (sock->type != SOCK_STREAM && sock->type != SOCK_DGRAM)
	734	return -ESOCKTNOSUPPORT;
	735
	736	sock->ops = &llcp_sock_ops;
	737
	738	sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
	739	if (sk == NULL)
	740	return -ENOMEM;
	741
	742	return 0;
	743	}
	744
	745	static const struct nfc_protocol llcp_nfc_proto = {
	746	.id = NFC_SOCKPROTO_LLCP,
	747	.proto = &llcp_sock_proto,
	748	.owner = THIS_MODULE,
	749	.create = llcp_sock_create
	750	};
	751
	752	int __init nfc_llcp_sock_init(void)
	753	{
	754	return nfc_proto_register(&llcp_nfc_proto);
	755	}
	756
	757	void nfc_llcp_sock_exit(void)
	758	{
	759	nfc_proto_unregister(&llcp_nfc_proto);
	760	}