net/phonet/socket.c - kernel/msm-4.9 - Gitiles

 /*
  * File: socket.c
  *
  * Phonet sockets
  *
  * Copyright (C) 2008 Nokia Corporation.
  *
  * Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
  * Original author: Sakari Ailus <sakari.ailus@nokia.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * version 2 as published by the Free Software Foundation.
  *
  * 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., 51 Franklin St, Fifth Floor, Boston, MA
  * 02110-1301 USA
  */

 #include <linux/kernel.h>
 #include <linux/net.h>
 #include <linux/poll.h>
 #include <net/sock.h>
 #include <net/tcp_states.h>

 #include <linux/phonet.h>
 #include <net/phonet/phonet.h>
 #include <net/phonet/pep.h>
 #include <net/phonet/pn_dev.h>

 static int pn_socket_release(struct socket *sock)
 {
 	struct sock *sk = sock->sk;

 	if (sk) {
 		sock->sk = NULL;
 		sk->sk_prot->close(sk, 0);
 	}
 	return 0;
 }

 static struct  {
 	struct hlist_head hlist;
 	spinlock_t lock;
 } pnsocks = {
 	.hlist = HLIST_HEAD_INIT,
 	.lock = __SPIN_LOCK_UNLOCKED(pnsocks.lock),
 };

 /*
  * Find address based on socket address, match only certain fields.
  * Also grab sock if it was found. Remember to sock_put it later.
  */
 struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *spn)
 {
 	struct hlist_node *node;
 	struct sock *sknode;
 	struct sock *rval = NULL;
 	u16 obj = pn_sockaddr_get_object(spn);
 	u8 res = spn->spn_resource;

 	spin_lock_bh(&pnsocks.lock);

 	sk_for_each(sknode, node, &pnsocks.hlist) {
 		struct pn_sock *pn = pn_sk(sknode);
 		BUG_ON(!pn->sobject); /* unbound socket */

 		if (!net_eq(sock_net(sknode), net))
 			continue;
 		if (pn_port(obj)) {
 			/* Look up socket by port */
 			if (pn_port(pn->sobject) != pn_port(obj))
 				continue;
 		} else {
 			/* If port is zero, look up by resource */
 			if (pn->resource != res)
 				continue;
 		}
 		if (pn_addr(pn->sobject)
 		 && pn_addr(pn->sobject) != pn_addr(obj))
 			continue;

 		rval = sknode;
 		sock_hold(sknode);
 		break;
 	}

 	spin_unlock_bh(&pnsocks.lock);

 	return rval;

 }

 void pn_sock_hash(struct sock *sk)
 {
 	spin_lock_bh(&pnsocks.lock);
 	sk_add_node(sk, &pnsocks.hlist);
 	spin_unlock_bh(&pnsocks.lock);
 }
 EXPORT_SYMBOL(pn_sock_hash);

 void pn_sock_unhash(struct sock *sk)
 {
 	spin_lock_bh(&pnsocks.lock);
 	sk_del_node_init(sk);
 	spin_unlock_bh(&pnsocks.lock);
 }
 EXPORT_SYMBOL(pn_sock_unhash);

 static DEFINE_MUTEX(port_mutex);

 static int pn_socket_bind(struct socket *sock, struct sockaddr *addr, int len)
 {
 	struct sock *sk = sock->sk;
 	struct pn_sock *pn = pn_sk(sk);
 	struct sockaddr_pn *spn = (struct sockaddr_pn *)addr;
 	int err;
 	u16 handle;
 	u8 saddr;

 	if (sk->sk_prot->bind)
 		return sk->sk_prot->bind(sk, addr, len);

 	if (len < sizeof(struct sockaddr_pn))
 		return -EINVAL;
 	if (spn->spn_family != AF_PHONET)
 		return -EAFNOSUPPORT;

 	handle = pn_sockaddr_get_object((struct sockaddr_pn *)addr);
 	saddr = pn_addr(handle);
 	if (saddr && phonet_address_lookup(sock_net(sk), saddr))
 		return -EADDRNOTAVAIL;

 	lock_sock(sk);
 	if (sk->sk_state != TCP_CLOSE || pn_port(pn->sobject)) {
 		err = -EINVAL; /* attempt to rebind */
 		goto out;
 	}
 	WARN_ON(sk_hashed(sk));
 	mutex_lock(&port_mutex);
 	err = sk->sk_prot->get_port(sk, pn_port(handle));
 	if (err)
 		goto out_port;

 	/* get_port() sets the port, bind() sets the address if applicable */
 	pn->sobject = pn_object(saddr, pn_port(pn->sobject));
 	pn->resource = spn->spn_resource;

 	/* Enable RX on the socket */
 	sk->sk_prot->hash(sk);
 out_port:
 	mutex_unlock(&port_mutex);
 out:
 	release_sock(sk);
 	return err;
 }

 static int pn_socket_autobind(struct socket *sock)
 {
 	struct sockaddr_pn sa;
 	int err;

 	memset(&sa, 0, sizeof(sa));
 	sa.spn_family = AF_PHONET;
 	err = pn_socket_bind(sock, (struct sockaddr *)&sa,
 				sizeof(struct sockaddr_pn));
 	if (err != -EINVAL)
 		return err;
 	BUG_ON(!pn_port(pn_sk(sock->sk)->sobject));
 	return 0; /* socket was already bound */
 }

 static int pn_socket_accept(struct socket *sock, struct socket *newsock,
 				int flags)
 {
 	struct sock *sk = sock->sk;
 	struct sock *newsk;
 	int err;

 	newsk = sk->sk_prot->accept(sk, flags, &err);
 	if (!newsk)
 		return err;

 	lock_sock(newsk);
 	sock_graft(newsk, newsock);
 	newsock->state = SS_CONNECTED;
 	release_sock(newsk);
 	return 0;
 }

 static int pn_socket_getname(struct socket *sock, struct sockaddr *addr,
 				int *sockaddr_len, int peer)
 {
 	struct sock *sk = sock->sk;
 	struct pn_sock *pn = pn_sk(sk);

 	memset(addr, 0, sizeof(struct sockaddr_pn));
 	addr->sa_family = AF_PHONET;
 	if (!peer) /* Race with bind() here is userland's problem. */
 		pn_sockaddr_set_object((struct sockaddr_pn *)addr,
 					pn->sobject);

 	*sockaddr_len = sizeof(struct sockaddr_pn);
 	return 0;
 }

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

 	poll_wait(file, &sock->wait, wait);

 	switch (sk->sk_state) {
 	case TCP_LISTEN:
 		return hlist_empty(&pn->ackq) ? 0 : POLLIN;
 	case TCP_CLOSE:
 		return POLLERR;
 	}

 	if (!skb_queue_empty(&sk->sk_receive_queue))
 		mask |= POLLIN | POLLRDNORM;
 	if (!skb_queue_empty(&pn->ctrlreq_queue))
 		mask |= POLLPRI;
 	if (!mask && sk->sk_state == TCP_CLOSE_WAIT)
 		return POLLHUP;

 	if (sk->sk_state == TCP_ESTABLISHED && atomic_read(&pn->tx_credits))
 		mask |= POLLOUT | POLLWRNORM | POLLWRBAND;

 	return mask;
 }

 static int pn_socket_ioctl(struct socket *sock, unsigned int cmd,
 				unsigned long arg)
 {
 	struct sock *sk = sock->sk;
 	struct pn_sock *pn = pn_sk(sk);

 	if (cmd == SIOCPNGETOBJECT) {
 		struct net_device *dev;
 		u16 handle;
 		u8 saddr;

 		if (get_user(handle, (__u16 __user *)arg))
 			return -EFAULT;

 		lock_sock(sk);
 		if (sk->sk_bound_dev_if)
 			dev = dev_get_by_index(sock_net(sk),
 						sk->sk_bound_dev_if);
 		else
 			dev = phonet_device_get(sock_net(sk));
 		if (dev && (dev->flags & IFF_UP))
 			saddr = phonet_address_get(dev, pn_addr(handle));
 		else
 			saddr = PN_NO_ADDR;
 		release_sock(sk);

 		if (dev)
 			dev_put(dev);
 		if (saddr == PN_NO_ADDR)
 			return -EHOSTUNREACH;

 		handle = pn_object(saddr, pn_port(pn->sobject));
 		return put_user(handle, (__u16 __user *)arg);
 	}

 	return sk->sk_prot->ioctl(sk, cmd, arg);
 }

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

 	if (sock->state != SS_UNCONNECTED)
 		return -EINVAL;
 	if (pn_socket_autobind(sock))
 		return -ENOBUFS;

 	lock_sock(sk);
 	if (sk->sk_state != TCP_CLOSE) {
 		err = -EINVAL;
 		goto out;
 	}

 	sk->sk_state = TCP_LISTEN;
 	sk->sk_ack_backlog = 0;
 	sk->sk_max_ack_backlog = backlog;
 out:
 	release_sock(sk);
 	return err;
 }

 static int pn_socket_sendmsg(struct kiocb *iocb, struct socket *sock,
 				struct msghdr *m, size_t total_len)
 {
 	struct sock *sk = sock->sk;

 	if (pn_socket_autobind(sock))
 		return -EAGAIN;

 	return sk->sk_prot->sendmsg(iocb, sk, m, total_len);
 }

 const struct proto_ops phonet_dgram_ops = {
 	.family		= AF_PHONET,
 	.owner		= THIS_MODULE,
 	.release	= pn_socket_release,
 	.bind		= pn_socket_bind,
 	.connect	= sock_no_connect,
 	.socketpair	= sock_no_socketpair,
 	.accept		= sock_no_accept,
 	.getname	= pn_socket_getname,
 	.poll		= datagram_poll,
 	.ioctl		= pn_socket_ioctl,
 	.listen		= sock_no_listen,
 	.shutdown	= sock_no_shutdown,
 	.setsockopt	= sock_no_setsockopt,
 	.getsockopt	= sock_no_getsockopt,
 #ifdef CONFIG_COMPAT
 	.compat_setsockopt = sock_no_setsockopt,
 	.compat_getsockopt = sock_no_getsockopt,
 #endif
 	.sendmsg	= pn_socket_sendmsg,
 	.recvmsg	= sock_common_recvmsg,
 	.mmap		= sock_no_mmap,
 	.sendpage	= sock_no_sendpage,
 };

 const struct proto_ops phonet_stream_ops = {
 	.family		= AF_PHONET,
 	.owner		= THIS_MODULE,
 	.release	= pn_socket_release,
 	.bind		= pn_socket_bind,
 	.connect	= sock_no_connect,
 	.socketpair	= sock_no_socketpair,
 	.accept		= pn_socket_accept,
 	.getname	= pn_socket_getname,
 	.poll		= pn_socket_poll,
 	.ioctl		= pn_socket_ioctl,
 	.listen		= pn_socket_listen,
 	.shutdown	= sock_no_shutdown,
 	.setsockopt	= sock_common_setsockopt,
 	.getsockopt	= sock_common_getsockopt,
 #ifdef CONFIG_COMPAT
 	.compat_setsockopt = compat_sock_common_setsockopt,
 	.compat_getsockopt = compat_sock_common_getsockopt,
 #endif
 	.sendmsg	= pn_socket_sendmsg,
 	.recvmsg	= sock_common_recvmsg,
 	.mmap		= sock_no_mmap,
 	.sendpage	= sock_no_sendpage,
 };
 EXPORT_SYMBOL(phonet_stream_ops);

 /* allocate port for a socket */
 int pn_sock_get_port(struct sock *sk, unsigned short sport)
 {
 	static int port_cur;
 	struct net *net = sock_net(sk);
 	struct pn_sock *pn = pn_sk(sk);
 	struct sockaddr_pn try_sa;
 	struct sock *tmpsk;

 	memset(&try_sa, 0, sizeof(struct sockaddr_pn));
 	try_sa.spn_family = AF_PHONET;
 	WARN_ON(!mutex_is_locked(&port_mutex));
 	if (!sport) {
 		/* search free port */
 		int port, pmin, pmax;

 		phonet_get_local_port_range(&pmin, &pmax);
 		for (port = pmin; port <= pmax; port++) {
 			port_cur++;
 			if (port_cur < pmin || port_cur > pmax)
 				port_cur = pmin;

 			pn_sockaddr_set_port(&try_sa, port_cur);
 			tmpsk = pn_find_sock_by_sa(net, &try_sa);
 			if (tmpsk == NULL) {
 				sport = port_cur;
 				goto found;
 			} else
 				sock_put(tmpsk);
 		}
 	} else {
 		/* try to find specific port */
 		pn_sockaddr_set_port(&try_sa, sport);
 		tmpsk = pn_find_sock_by_sa(net, &try_sa);
 		if (tmpsk == NULL)
 			/* No sock there! We can use that port... */
 			goto found;
 		else
 			sock_put(tmpsk);
 	}
 	/* the port must be in use already */
 	return -EADDRINUSE;

 found:
 	pn->sobject = pn_object(pn_addr(pn->sobject), sport);
 	return 0;
 }
 EXPORT_SYMBOL(pn_sock_get_port);

 #ifdef CONFIG_PROC_FS
 static struct sock *pn_sock_get_idx(struct seq_file *seq, loff_t pos)
 {
 	struct net *net = seq_file_net(seq);
 	struct hlist_node *node;
 	struct sock *sknode;

 	sk_for_each(sknode, node, &pnsocks.hlist) {
 		if (!net_eq(net, sock_net(sknode)))
 			continue;
 		if (!pos)
 			return sknode;
 		pos--;
 	}
 	return NULL;
 }

 static struct sock *pn_sock_get_next(struct seq_file *seq, struct sock *sk)
 {
 	struct net *net = seq_file_net(seq);

 	do
 		sk = sk_next(sk);
 	while (sk && !net_eq(net, sock_net(sk)));

 	return sk;
 }

 static void *pn_sock_seq_start(struct seq_file *seq, loff_t *pos)
 	__acquires(pnsocks.lock)
 {
 	spin_lock_bh(&pnsocks.lock);
 	return *pos ? pn_sock_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
 }

 static void *pn_sock_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
 	struct sock *sk;

 	if (v == SEQ_START_TOKEN)
 		sk = pn_sock_get_idx(seq, 0);
 	else
 		sk = pn_sock_get_next(seq, v);
 	(*pos)++;
 	return sk;
 }

 static void pn_sock_seq_stop(struct seq_file *seq, void *v)
 	__releases(pnsocks.lock)
 {
 	spin_unlock_bh(&pnsocks.lock);
 }

 static int pn_sock_seq_show(struct seq_file *seq, void *v)
 {
 	int len;

 	if (v == SEQ_START_TOKEN)
 		seq_printf(seq, "%s%n", "pt  loc  rem rs st tx_queue rx_queue "
 			"  uid inode ref pointer drops", &len);
 	else {
 		struct sock *sk = v;
 		struct pn_sock *pn = pn_sk(sk);

 		seq_printf(seq, "%2d %04X:%04X:%02X %02X %08X:%08X %5d %lu "
 			"%d %p %d%n",
 			sk->sk_protocol, pn->sobject, 0, pn->resource,
 			sk->sk_state,
 			sk_wmem_alloc_get(sk), sk_rmem_alloc_get(sk),
 			sock_i_uid(sk), sock_i_ino(sk),
 			atomic_read(&sk->sk_refcnt), sk,
 			atomic_read(&sk->sk_drops), &len);
 	}
 	seq_printf(seq, "%*s\n", 127 - len, "");
 	return 0;
 }

 static const struct seq_operations pn_sock_seq_ops = {
 	.start = pn_sock_seq_start,
 	.next = pn_sock_seq_next,
 	.stop = pn_sock_seq_stop,
 	.show = pn_sock_seq_show,
 };

 static int pn_sock_open(struct inode *inode, struct file *file)
 {
 	return seq_open_net(inode, file, &pn_sock_seq_ops,
 				sizeof(struct seq_net_private));
 }

 const struct file_operations pn_sock_seq_fops = {
 	.owner = THIS_MODULE,
 	.open = pn_sock_open,
 	.read = seq_read,
 	.llseek = seq_lseek,
 	.release = seq_release_net,
 };
 #endif
	/*
	* File: socket.c
	*
	* Phonet sockets
	*
	* Copyright (C) 2008 Nokia Corporation.
	*
	* Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
	* Original author: Sakari Ailus <sakari.ailus@nokia.com>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* version 2 as published by the Free Software Foundation.
	*
	* 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., 51 Franklin St, Fifth Floor, Boston, MA
	* 02110-1301 USA
	*/

	#include <linux/kernel.h>
	#include <linux/net.h>
	#include <linux/poll.h>
	#include <net/sock.h>
	#include <net/tcp_states.h>

	#include <linux/phonet.h>
	#include <net/phonet/phonet.h>
	#include <net/phonet/pep.h>
	#include <net/phonet/pn_dev.h>

	static int pn_socket_release(struct socket *sock)
	{
	struct sock *sk = sock->sk;

	if (sk) {
	sock->sk = NULL;
	sk->sk_prot->close(sk, 0);
	}
	return 0;
	}

	static struct {
	struct hlist_head hlist;
	spinlock_t lock;
	} pnsocks = {
	.hlist = HLIST_HEAD_INIT,
	.lock = __SPIN_LOCK_UNLOCKED(pnsocks.lock),
	};

	/*
	* Find address based on socket address, match only certain fields.
	* Also grab sock if it was found. Remember to sock_put it later.
	*/
	struct sock pn_find_sock_by_sa(struct net net, const struct sockaddr_pn *spn)
	{
	struct hlist_node *node;
	struct sock *sknode;
	struct sock *rval = NULL;
	u16 obj = pn_sockaddr_get_object(spn);
	u8 res = spn->spn_resource;

	spin_lock_bh(&pnsocks.lock);

	sk_for_each(sknode, node, &pnsocks.hlist) {
	struct pn_sock *pn = pn_sk(sknode);
	BUG_ON(!pn->sobject); /* unbound socket */

	if (!net_eq(sock_net(sknode), net))
	continue;
	if (pn_port(obj)) {
	/* Look up socket by port */
	if (pn_port(pn->sobject) != pn_port(obj))
	continue;
	} else {
	/* If port is zero, look up by resource */
	if (pn->resource != res)
	continue;
	}
	if (pn_addr(pn->sobject)
	&& pn_addr(pn->sobject) != pn_addr(obj))
	continue;

	rval = sknode;
	sock_hold(sknode);
	break;
	}

	spin_unlock_bh(&pnsocks.lock);

	return rval;

	}

	void pn_sock_hash(struct sock *sk)
	{
	spin_lock_bh(&pnsocks.lock);
	sk_add_node(sk, &pnsocks.hlist);
	spin_unlock_bh(&pnsocks.lock);
	}
	EXPORT_SYMBOL(pn_sock_hash);

	void pn_sock_unhash(struct sock *sk)
	{
	spin_lock_bh(&pnsocks.lock);
	sk_del_node_init(sk);
	spin_unlock_bh(&pnsocks.lock);
	}
	EXPORT_SYMBOL(pn_sock_unhash);

	static DEFINE_MUTEX(port_mutex);

	static int pn_socket_bind(struct socket sock, struct sockaddr addr, int len)
	{
	struct sock *sk = sock->sk;
	struct pn_sock *pn = pn_sk(sk);
	struct sockaddr_pn spn = (struct sockaddr_pn )addr;
	int err;
	u16 handle;
	u8 saddr;

	if (sk->sk_prot->bind)
	return sk->sk_prot->bind(sk, addr, len);

	if (len < sizeof(struct sockaddr_pn))
	return -EINVAL;
	if (spn->spn_family != AF_PHONET)
	return -EAFNOSUPPORT;

	handle = pn_sockaddr_get_object((struct sockaddr_pn *)addr);
	saddr = pn_addr(handle);
	if (saddr && phonet_address_lookup(sock_net(sk), saddr))
	return -EADDRNOTAVAIL;

	lock_sock(sk);
	if (sk->sk_state != TCP_CLOSE \|\| pn_port(pn->sobject)) {
	err = -EINVAL; /* attempt to rebind */
	goto out;
	}
	WARN_ON(sk_hashed(sk));
	mutex_lock(&port_mutex);
	err = sk->sk_prot->get_port(sk, pn_port(handle));
	if (err)
	goto out_port;

	/* get_port() sets the port, bind() sets the address if applicable */
	pn->sobject = pn_object(saddr, pn_port(pn->sobject));
	pn->resource = spn->spn_resource;

	/* Enable RX on the socket */
	sk->sk_prot->hash(sk);
	out_port:
	mutex_unlock(&port_mutex);
	out:
	release_sock(sk);
	return err;
	}

	static int pn_socket_autobind(struct socket *sock)
	{
	struct sockaddr_pn sa;
	int err;

	memset(&sa, 0, sizeof(sa));
	sa.spn_family = AF_PHONET;
	err = pn_socket_bind(sock, (struct sockaddr *)&sa,
	sizeof(struct sockaddr_pn));
	if (err != -EINVAL)
	return err;
	BUG_ON(!pn_port(pn_sk(sock->sk)->sobject));
	return 0; /* socket was already bound */
	}

	static int pn_socket_accept(struct socket sock, struct socket newsock,
	int flags)
	{
	struct sock *sk = sock->sk;
	struct sock *newsk;
	int err;

	newsk = sk->sk_prot->accept(sk, flags, &err);
	if (!newsk)
	return err;

	lock_sock(newsk);
	sock_graft(newsk, newsock);
	newsock->state = SS_CONNECTED;
	release_sock(newsk);
	return 0;
	}

	static int pn_socket_getname(struct socket sock, struct sockaddr addr,
	int *sockaddr_len, int peer)
	{
	struct sock *sk = sock->sk;
	struct pn_sock *pn = pn_sk(sk);

	memset(addr, 0, sizeof(struct sockaddr_pn));
	addr->sa_family = AF_PHONET;
	if (!peer) /* Race with bind() here is userland's problem. */
	pn_sockaddr_set_object((struct sockaddr_pn *)addr,
	pn->sobject);

	*sockaddr_len = sizeof(struct sockaddr_pn);
	return 0;
	}

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

	poll_wait(file, &sock->wait, wait);

	switch (sk->sk_state) {
	case TCP_LISTEN:
	return hlist_empty(&pn->ackq) ? 0 : POLLIN;
	case TCP_CLOSE:
	return POLLERR;
	}

	if (!skb_queue_empty(&sk->sk_receive_queue))
	mask \|= POLLIN \| POLLRDNORM;
	if (!skb_queue_empty(&pn->ctrlreq_queue))
	mask \|= POLLPRI;
	if (!mask && sk->sk_state == TCP_CLOSE_WAIT)
	return POLLHUP;

	if (sk->sk_state == TCP_ESTABLISHED && atomic_read(&pn->tx_credits))
	mask \|= POLLOUT \| POLLWRNORM \| POLLWRBAND;

	return mask;
	}

	static int pn_socket_ioctl(struct socket *sock, unsigned int cmd,
	unsigned long arg)
	{
	struct sock *sk = sock->sk;
	struct pn_sock *pn = pn_sk(sk);

	if (cmd == SIOCPNGETOBJECT) {
	struct net_device *dev;
	u16 handle;
	u8 saddr;

	if (get_user(handle, (__u16 __user *)arg))
	return -EFAULT;

	lock_sock(sk);
	if (sk->sk_bound_dev_if)
	dev = dev_get_by_index(sock_net(sk),
	sk->sk_bound_dev_if);
	else
	dev = phonet_device_get(sock_net(sk));
	if (dev && (dev->flags & IFF_UP))
	saddr = phonet_address_get(dev, pn_addr(handle));
	else
	saddr = PN_NO_ADDR;
	release_sock(sk);

	if (dev)
	dev_put(dev);
	if (saddr == PN_NO_ADDR)
	return -EHOSTUNREACH;

	handle = pn_object(saddr, pn_port(pn->sobject));
	return put_user(handle, (__u16 __user *)arg);
	}

	return sk->sk_prot->ioctl(sk, cmd, arg);
	}

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

	if (sock->state != SS_UNCONNECTED)
	return -EINVAL;
	if (pn_socket_autobind(sock))
	return -ENOBUFS;

	lock_sock(sk);
	if (sk->sk_state != TCP_CLOSE) {
	err = -EINVAL;
	goto out;
	}

	sk->sk_state = TCP_LISTEN;
	sk->sk_ack_backlog = 0;
	sk->sk_max_ack_backlog = backlog;
	out:
	release_sock(sk);
	return err;
	}

	static int pn_socket_sendmsg(struct kiocb iocb, struct socket sock,
	struct msghdr *m, size_t total_len)
	{
	struct sock *sk = sock->sk;

	if (pn_socket_autobind(sock))
	return -EAGAIN;

	return sk->sk_prot->sendmsg(iocb, sk, m, total_len);
	}

	const struct proto_ops phonet_dgram_ops = {
	.family = AF_PHONET,
	.owner = THIS_MODULE,
	.release = pn_socket_release,
	.bind = pn_socket_bind,
	.connect = sock_no_connect,
	.socketpair = sock_no_socketpair,
	.accept = sock_no_accept,
	.getname = pn_socket_getname,
	.poll = datagram_poll,
	.ioctl = pn_socket_ioctl,
	.listen = sock_no_listen,
	.shutdown = sock_no_shutdown,
	.setsockopt = sock_no_setsockopt,
	.getsockopt = sock_no_getsockopt,
	#ifdef CONFIG_COMPAT
	.compat_setsockopt = sock_no_setsockopt,
	.compat_getsockopt = sock_no_getsockopt,
	#endif
	.sendmsg = pn_socket_sendmsg,
	.recvmsg = sock_common_recvmsg,
	.mmap = sock_no_mmap,
	.sendpage = sock_no_sendpage,
	};

	const struct proto_ops phonet_stream_ops = {
	.family = AF_PHONET,
	.owner = THIS_MODULE,
	.release = pn_socket_release,
	.bind = pn_socket_bind,
	.connect = sock_no_connect,
	.socketpair = sock_no_socketpair,
	.accept = pn_socket_accept,
	.getname = pn_socket_getname,
	.poll = pn_socket_poll,
	.ioctl = pn_socket_ioctl,
	.listen = pn_socket_listen,
	.shutdown = sock_no_shutdown,
	.setsockopt = sock_common_setsockopt,
	.getsockopt = sock_common_getsockopt,
	#ifdef CONFIG_COMPAT
	.compat_setsockopt = compat_sock_common_setsockopt,
	.compat_getsockopt = compat_sock_common_getsockopt,
	#endif
	.sendmsg = pn_socket_sendmsg,
	.recvmsg = sock_common_recvmsg,
	.mmap = sock_no_mmap,
	.sendpage = sock_no_sendpage,
	};
	EXPORT_SYMBOL(phonet_stream_ops);

	/* allocate port for a socket */
	int pn_sock_get_port(struct sock *sk, unsigned short sport)
	{
	static int port_cur;
	struct net *net = sock_net(sk);
	struct pn_sock *pn = pn_sk(sk);
	struct sockaddr_pn try_sa;
	struct sock *tmpsk;

	memset(&try_sa, 0, sizeof(struct sockaddr_pn));
	try_sa.spn_family = AF_PHONET;
	WARN_ON(!mutex_is_locked(&port_mutex));
	if (!sport) {
	/* search free port */
	int port, pmin, pmax;

	phonet_get_local_port_range(&pmin, &pmax);
	for (port = pmin; port <= pmax; port++) {
	port_cur++;
	if (port_cur < pmin \|\| port_cur > pmax)
	port_cur = pmin;

	pn_sockaddr_set_port(&try_sa, port_cur);
	tmpsk = pn_find_sock_by_sa(net, &try_sa);
	if (tmpsk == NULL) {
	sport = port_cur;
	goto found;
	} else
	sock_put(tmpsk);
	}
	} else {
	/* try to find specific port */
	pn_sockaddr_set_port(&try_sa, sport);
	tmpsk = pn_find_sock_by_sa(net, &try_sa);
	if (tmpsk == NULL)
	/* No sock there! We can use that port... */
	goto found;
	else
	sock_put(tmpsk);
	}
	/* the port must be in use already */
	return -EADDRINUSE;

	found:
	pn->sobject = pn_object(pn_addr(pn->sobject), sport);
	return 0;
	}
	EXPORT_SYMBOL(pn_sock_get_port);

	#ifdef CONFIG_PROC_FS
	static struct sock pn_sock_get_idx(struct seq_file seq, loff_t pos)
	{
	struct net *net = seq_file_net(seq);
	struct hlist_node *node;
	struct sock *sknode;

	sk_for_each(sknode, node, &pnsocks.hlist) {
	if (!net_eq(net, sock_net(sknode)))
	continue;
	if (!pos)
	return sknode;
	pos--;
	}
	return NULL;
	}

	static struct sock pn_sock_get_next(struct seq_file seq, struct sock *sk)
	{
	struct net *net = seq_file_net(seq);

	do
	sk = sk_next(sk);
	while (sk && !net_eq(net, sock_net(sk)));

	return sk;
	}

	static void pn_sock_seq_start(struct seq_file seq, loff_t *pos)
	__acquires(pnsocks.lock)
	{
	spin_lock_bh(&pnsocks.lock);
	return pos ? pn_sock_get_idx(seq, pos - 1) : SEQ_START_TOKEN;
	}

	static void pn_sock_seq_next(struct seq_file seq, void v, loff_t pos)
	{
	struct sock *sk;

	if (v == SEQ_START_TOKEN)
	sk = pn_sock_get_idx(seq, 0);
	else
	sk = pn_sock_get_next(seq, v);
	(*pos)++;
	return sk;
	}

	static void pn_sock_seq_stop(struct seq_file seq, void v)
	__releases(pnsocks.lock)
	{
	spin_unlock_bh(&pnsocks.lock);
	}

	static int pn_sock_seq_show(struct seq_file seq, void v)
	{
	int len;

	if (v == SEQ_START_TOKEN)
	seq_printf(seq, "%s%n", "pt loc rem rs st tx_queue rx_queue "
	" uid inode ref pointer drops", &len);
	else {
	struct sock *sk = v;
	struct pn_sock *pn = pn_sk(sk);

	seq_printf(seq, "%2d %04X:%04X:%02X %02X %08X:%08X %5d %lu "
	"%d %p %d%n",
	sk->sk_protocol, pn->sobject, 0, pn->resource,
	sk->sk_state,
	sk_wmem_alloc_get(sk), sk_rmem_alloc_get(sk),
	sock_i_uid(sk), sock_i_ino(sk),
	atomic_read(&sk->sk_refcnt), sk,
	atomic_read(&sk->sk_drops), &len);
	}
	seq_printf(seq, "%*s\n", 127 - len, "");
	return 0;
	}

	static const struct seq_operations pn_sock_seq_ops = {
	.start = pn_sock_seq_start,
	.next = pn_sock_seq_next,
	.stop = pn_sock_seq_stop,
	.show = pn_sock_seq_show,
	};

	static int pn_sock_open(struct inode inode, struct file file)
	{
	return seq_open_net(inode, file, &pn_sock_seq_ops,
	sizeof(struct seq_net_private));
	}

	const struct file_operations pn_sock_seq_fops = {
	.owner = THIS_MODULE,
	.open = pn_sock_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = seq_release_net,
	};
	#endif