[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / phonet / socket.c

/*
 * 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/gfp.h>
#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;
}

#define PN_HASHSIZE	16
#define PN_HASHMASK	(PN_HASHSIZE-1)


static struct  {
	struct hlist_head hlist[PN_HASHSIZE];
	spinlock_t lock;
} pnsocks;

void __init pn_sock_init(void)
{
	unsigned i;

	for (i = 0; i < PN_HASHSIZE; i++)
		INIT_HLIST_HEAD(pnsocks.hlist + i);
	spin_lock_init(&pnsocks.lock);
}

static struct hlist_head *pn_hash_list(u16 obj)
{
	return pnsocks.hlist + (obj & PN_HASHMASK);
}

/*
 * 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;
	struct hlist_head *hlist = pn_hash_list(obj);

	spin_lock_bh(&pnsocks.lock);

	sk_for_each(sknode, node, 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;
}

/* Deliver a broadcast packet (only in bottom-half) */
void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb)
{
	struct hlist_head *hlist = pnsocks.hlist;
	unsigned h;

	spin_lock(&pnsocks.lock);
	for (h = 0; h < PN_HASHSIZE; h++) {
		struct hlist_node *node;
		struct sock *sknode;

		sk_for_each(sknode, node, hlist) {
			struct sk_buff *clone;

			if (!net_eq(sock_net(sknode), net))
				continue;
			if (!sock_flag(sknode, SOCK_BROADCAST))
				continue;

			clone = skb_clone(skb, GFP_ATOMIC);
			if (clone) {
				sock_hold(sknode);
				sk_receive_skb(sknode, clone, 0);
			}
		}
		hlist++;
	}
	spin_unlock(&pnsocks.lock);
}

void pn_sock_hash(struct sock *sk)
{
	struct hlist_head *hlist = pn_hash_list(pn_sk(sk)->sobject);

	spin_lock_bh(&pnsocks.lock);
	sk_add_node(sk, 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);
	pn_sock_unbind_all_res(sk);
}
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, sk_sleep(sk), 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(&sk->sk_wmem_alloc) < sk->sk_sndbuf &&
		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_head *hlist = pnsocks.hlist;
	struct hlist_node *node;
	struct sock *sknode;
	unsigned h;

	for (h = 0; h < PN_HASHSIZE; h++) {
		sk_for_each(sknode, node, hlist) {
			if (!net_eq(net, sock_net(sknode)))
				continue;
			if (!pos)
				return sknode;
			pos--;
		}
		hlist++;
	}
	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

static struct  {
	struct sock *sk[256];
} pnres;

/*
 * Find and hold socket based on resource.
 */
struct sock *pn_find_sock_by_res(struct net *net, u8 res)
{
	struct sock *sk;

	if (!net_eq(net, &init_net))
		return NULL;

	rcu_read_lock();
	sk = rcu_dereference(pnres.sk[res]);
	if (sk)
		sock_hold(sk);
	rcu_read_unlock();
	return sk;
}

static DEFINE_MUTEX(resource_mutex);

int pn_sock_bind_res(struct sock *sk, u8 res)
{
	int ret = -EADDRINUSE;

	if (!net_eq(sock_net(sk), &init_net))
		return -ENOIOCTLCMD;
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;
	if (pn_socket_autobind(sk->sk_socket))
		return -EAGAIN;

	mutex_lock(&resource_mutex);
	if (pnres.sk[res] == NULL) {
		sock_hold(sk);
		rcu_assign_pointer(pnres.sk[res], sk);
		ret = 0;
	}
	mutex_unlock(&resource_mutex);
	return ret;
}

int pn_sock_unbind_res(struct sock *sk, u8 res)
{
	int ret = -ENOENT;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	mutex_lock(&resource_mutex);
	if (pnres.sk[res] == sk) {
		rcu_assign_pointer(pnres.sk[res], NULL);
		ret = 0;
	}
	mutex_unlock(&resource_mutex);

	if (ret == 0) {
		synchronize_rcu();
		sock_put(sk);
	}
	return ret;
}

void pn_sock_unbind_all_res(struct sock *sk)
{
	unsigned res, match = 0;

	mutex_lock(&resource_mutex);
	for (res = 0; res < 256; res++) {
		if (pnres.sk[res] == sk) {
			rcu_assign_pointer(pnres.sk[res], NULL);
			match++;
		}
	}
	mutex_unlock(&resource_mutex);

	if (match == 0)
		return;
	synchronize_rcu();
	while (match > 0) {
		sock_put(sk);
		match--;
	}
}

#ifdef CONFIG_PROC_FS
static struct sock **pn_res_get_idx(struct seq_file *seq, loff_t pos)
{
	struct net *net = seq_file_net(seq);
	unsigned i;

	if (!net_eq(net, &init_net))
		return NULL;

	for (i = 0; i < 256; i++) {
		if (pnres.sk[i] == NULL)
			continue;
		if (!pos)
			return pnres.sk + i;
		pos--;
	}
	return NULL;
}

static struct sock **pn_res_get_next(struct seq_file *seq, struct sock **sk)
{
	struct net *net = seq_file_net(seq);
	unsigned i;

	BUG_ON(!net_eq(net, &init_net));

	for (i = (sk - pnres.sk) + 1; i < 256; i++)
		if (pnres.sk[i])
			return pnres.sk + i;
	return NULL;
}

static void *pn_res_seq_start(struct seq_file *seq, loff_t *pos)
	__acquires(resource_mutex)
{
	mutex_lock(&resource_mutex);
	return *pos ? pn_res_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
}

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

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

static void pn_res_seq_stop(struct seq_file *seq, void *v)
	__releases(resource_mutex)
{
	mutex_unlock(&resource_mutex);
}

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

	if (v == SEQ_START_TOKEN)
		seq_printf(seq, "%s%n", "rs   uid inode", &len);
	else {
		struct sock **psk = v;
		struct sock *sk = *psk;

		seq_printf(seq, "%02X %5d %lu%n",
			   (int) (psk - pnres.sk), sock_i_uid(sk),
			   sock_i_ino(sk), &len);
	}
	seq_printf(seq, "%*s\n", 63 - len, "");
	return 0;
}

static const struct seq_operations pn_res_seq_ops = {
	.start = pn_res_seq_start,
	.next = pn_res_seq_next,
	.stop = pn_res_seq_stop,
	.show = pn_res_seq_show,
};

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

const struct file_operations pn_res_seq_fops = {
	.owner = THIS_MODULE,
	.open = pn_res_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = seq_release_net,
};
#endif
Commit	Line	Data
ba113a94 RDC	1	/*
	2	* File: socket.c
	3	*
	4	* Phonet sockets
	5	*
	6	* Copyright (C) 2008 Nokia Corporation.
	7	*
	8	* Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
	9	* Original author: Sakari Ailus <sakari.ailus@nokia.com>
	10	*
	11	* This program is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License
	13	* version 2 as published by the Free Software Foundation.
	14	*
	15	* This program is distributed in the hope that it will be useful, but
	16	* WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	* General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	23	* 02110-1301 USA
	24	*/
	25
5a0e3ad6	26	#include <linux/gfp.h>
ba113a94 RDC	27	#include <linux/kernel.h>
ba113a94 RDC	28	#include <linux/net.h>
9995a32b	29	#include <linux/poll.h>
ba113a94 RDC	30	#include <net/sock.h>
	31	#include <net/tcp_states.h>
	32
	33	#include <linux/phonet.h>
	34	#include <net/phonet/phonet.h>
9995a32b	35	#include <net/phonet/pep.h>
ba113a94 RDC	36	#include <net/phonet/pn_dev.h>
	37
	38	static int pn_socket_release(struct socket *sock)
	39	{
	40	struct sock *sk = sock->sk;
	41
	42	if (sk) {
	43	sock->sk = NULL;
	44	sk->sk_prot->close(sk, 0);
	45	}
	46	return 0;
	47	}
	48
6b0d07ba RDC	49	#define PN_HASHSIZE 16
	50	#define PN_HASHMASK (PN_HASHSIZE-1)
	51
	52
ba113a94	53	static struct {
6b0d07ba	54	struct hlist_head hlist[PN_HASHSIZE];
ba113a94	55	spinlock_t lock;
6b0d07ba RDC	56	} pnsocks;
	57
	58	void __init pn_sock_init(void)
	59	{
	60	unsigned i;
	61
	62	for (i = 0; i < PN_HASHSIZE; i++)
	63	INIT_HLIST_HEAD(pnsocks.hlist + i);
	64	spin_lock_init(&pnsocks.lock);
	65	}
	66
	67	static struct hlist_head *pn_hash_list(u16 obj)
	68	{
	69	return pnsocks.hlist + (obj & PN_HASHMASK);
	70	}
ba113a94 RDC	71
	72	/*
	73	* Find address based on socket address, match only certain fields.
	74	* Also grab sock if it was found. Remember to sock_put it later.
	75	*/
52404881	76	struct sock pn_find_sock_by_sa(struct net net, const struct sockaddr_pn *spn)
ba113a94 RDC	77	{
	78	struct hlist_node *node;
	79	struct sock *sknode;
	80	struct sock *rval = NULL;
	81	u16 obj = pn_sockaddr_get_object(spn);
	82	u8 res = spn->spn_resource;
6b0d07ba	83	struct hlist_head *hlist = pn_hash_list(obj);
ba113a94 RDC	84
	85	spin_lock_bh(&pnsocks.lock);
	86
6b0d07ba	87	sk_for_each(sknode, node, hlist) {
ba113a94 RDC	88	struct pn_sock *pn = pn_sk(sknode);
	89	BUG_ON(!pn->sobject); /* unbound socket */
	90
52404881 RDC	91	if (!net_eq(sock_net(sknode), net))
52404881 RDC	92	continue;
ba113a94 RDC	93	if (pn_port(obj)) {
	94	/* Look up socket by port */
	95	if (pn_port(pn->sobject) != pn_port(obj))
	96	continue;
	97	} else {
	98	/* If port is zero, look up by resource */
	99	if (pn->resource != res)
	100	continue;
	101	}
f64f9e71 JP	102	if (pn_addr(pn->sobject) &&
f64f9e71 JP	103	pn_addr(pn->sobject) != pn_addr(obj))
ba113a94 RDC	104	continue;
	105
	106	rval = sknode;
	107	sock_hold(sknode);
	108	break;
	109	}
	110
	111	spin_unlock_bh(&pnsocks.lock);
	112
	113	return rval;
f14001fc RDC	114	}
	115
	116	/* Deliver a broadcast packet (only in bottom-half) */
	117	void pn_deliver_sock_broadcast(struct net net, struct sk_buff skb)
	118	{
6b0d07ba RDC	119	struct hlist_head *hlist = pnsocks.hlist;
6b0d07ba RDC	120	unsigned h;
f14001fc RDC	121
f14001fc RDC	122	spin_lock(&pnsocks.lock);
6b0d07ba RDC	123	for (h = 0; h < PN_HASHSIZE; h++) {
	124	struct hlist_node *node;
	125	struct sock *sknode;
f14001fc	126
6b0d07ba RDC	127	sk_for_each(sknode, node, hlist) {
6b0d07ba RDC	128	struct sk_buff *clone;
ba113a94	129
6b0d07ba RDC	130	if (!net_eq(sock_net(sknode), net))
	131	continue;
	132	if (!sock_flag(sknode, SOCK_BROADCAST))
	133	continue;
	134
	135	clone = skb_clone(skb, GFP_ATOMIC);
	136	if (clone) {
	137	sock_hold(sknode);
	138	sk_receive_skb(sknode, clone, 0);
	139	}
21912d1c	140	}
6b0d07ba	141	hlist++;
f14001fc RDC	142	}
f14001fc RDC	143	spin_unlock(&pnsocks.lock);
ba113a94 RDC	144	}
	145
	146	void pn_sock_hash(struct sock *sk)
	147	{
6b0d07ba RDC	148	struct hlist_head *hlist = pn_hash_list(pn_sk(sk)->sobject);
6b0d07ba RDC	149
ba113a94	150	spin_lock_bh(&pnsocks.lock);
6b0d07ba	151	sk_add_node(sk, hlist);
ba113a94 RDC	152	spin_unlock_bh(&pnsocks.lock);
	153	}
	154	EXPORT_SYMBOL(pn_sock_hash);
	155
	156	void pn_sock_unhash(struct sock *sk)
	157	{
	158	spin_lock_bh(&pnsocks.lock);
	159	sk_del_node_init(sk);
	160	spin_unlock_bh(&pnsocks.lock);
7417fa83	161	pn_sock_unbind_all_res(sk);
ba113a94 RDC	162	}
	163	EXPORT_SYMBOL(pn_sock_unhash);
	164
582b0b61 RDC	165	static DEFINE_MUTEX(port_mutex);
582b0b61 RDC	166
ba113a94 RDC	167	static int pn_socket_bind(struct socket sock, struct sockaddr addr, int len)
	168	{
	169	struct sock *sk = sock->sk;
	170	struct pn_sock *pn = pn_sk(sk);
	171	struct sockaddr_pn spn = (struct sockaddr_pn )addr;
	172	int err;
	173	u16 handle;
	174	u8 saddr;
	175
	176	if (sk->sk_prot->bind)
	177	return sk->sk_prot->bind(sk, addr, len);
	178
	179	if (len < sizeof(struct sockaddr_pn))
	180	return -EINVAL;
	181	if (spn->spn_family != AF_PHONET)
	182	return -EAFNOSUPPORT;
	183
	184	handle = pn_sockaddr_get_object((struct sockaddr_pn *)addr);
	185	saddr = pn_addr(handle);
52404881	186	if (saddr && phonet_address_lookup(sock_net(sk), saddr))
ba113a94 RDC	187	return -EADDRNOTAVAIL;
	188
	189	lock_sock(sk);
	190	if (sk->sk_state != TCP_CLOSE \|\| pn_port(pn->sobject)) {
	191	err = -EINVAL; /* attempt to rebind */
	192	goto out;
	193	}
582b0b61 RDC	194	WARN_ON(sk_hashed(sk));
582b0b61 RDC	195	mutex_lock(&port_mutex);
ba113a94 RDC	196	err = sk->sk_prot->get_port(sk, pn_port(handle));
ba113a94 RDC	197	if (err)
582b0b61	198	goto out_port;
ba113a94 RDC	199
	200	/* get_port() sets the port, bind() sets the address if applicable */
	201	pn->sobject = pn_object(saddr, pn_port(pn->sobject));
	202	pn->resource = spn->spn_resource;
	203
	204	/* Enable RX on the socket */
	205	sk->sk_prot->hash(sk);
582b0b61 RDC	206	out_port:
582b0b61 RDC	207	mutex_unlock(&port_mutex);
ba113a94 RDC	208	out:
	209	release_sock(sk);
	210	return err;
	211	}
	212
	213	static int pn_socket_autobind(struct socket *sock)
	214	{
	215	struct sockaddr_pn sa;
	216	int err;
	217
	218	memset(&sa, 0, sizeof(sa));
	219	sa.spn_family = AF_PHONET;
	220	err = pn_socket_bind(sock, (struct sockaddr *)&sa,
	221	sizeof(struct sockaddr_pn));
	222	if (err != -EINVAL)
	223	return err;
	224	BUG_ON(!pn_port(pn_sk(sock->sk)->sobject));
	225	return 0; /* socket was already bound */
	226	}
	227
9995a32b RDC	228	static int pn_socket_accept(struct socket sock, struct socket newsock,
	229	int flags)
	230	{
	231	struct sock *sk = sock->sk;
	232	struct sock *newsk;
	233	int err;
	234
	235	newsk = sk->sk_prot->accept(sk, flags, &err);
	236	if (!newsk)
	237	return err;
	238
	239	lock_sock(newsk);
	240	sock_graft(newsk, newsock);
	241	newsock->state = SS_CONNECTED;
	242	release_sock(newsk);
	243	return 0;
	244	}
	245
ba113a94 RDC	246	static int pn_socket_getname(struct socket sock, struct sockaddr addr,
	247	int *sockaddr_len, int peer)
	248	{
	249	struct sock *sk = sock->sk;
	250	struct pn_sock *pn = pn_sk(sk);
	251
	252	memset(addr, 0, sizeof(struct sockaddr_pn));
	253	addr->sa_family = AF_PHONET;
	254	if (!peer) /* Race with bind() here is userland's problem. */
	255	pn_sockaddr_set_object((struct sockaddr_pn *)addr,
	256	pn->sobject);
	257
	258	*sockaddr_len = sizeof(struct sockaddr_pn);
	259	return 0;
	260	}
	261
9995a32b RDC	262	static unsigned int pn_socket_poll(struct file file, struct socket sock,
	263	poll_table *wait)
	264	{
	265	struct sock *sk = sock->sk;
	266	struct pep_sock *pn = pep_sk(sk);
	267	unsigned int mask = 0;
	268
43815482	269	poll_wait(file, sk_sleep(sk), wait);
9995a32b RDC	270
	271	switch (sk->sk_state) {
	272	case TCP_LISTEN:
	273	return hlist_empty(&pn->ackq) ? 0 : POLLIN;
	274	case TCP_CLOSE:
	275	return POLLERR;
	276	}
	277
	278	if (!skb_queue_empty(&sk->sk_receive_queue))
	279	mask \|= POLLIN \| POLLRDNORM;
c41bd97f RDC	280	if (!skb_queue_empty(&pn->ctrlreq_queue))
	281	mask \|= POLLPRI;
	282	if (!mask && sk->sk_state == TCP_CLOSE_WAIT)
9995a32b RDC	283	return POLLHUP;
9995a32b RDC	284
01b38606 RDC	285	if (sk->sk_state == TCP_ESTABLISHED &&
	286	atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf &&
	287	atomic_read(&pn->tx_credits))
9995a32b RDC	288	mask \|= POLLOUT \| POLLWRNORM \| POLLWRBAND;
	289
	290	return mask;
	291	}
	292
ba113a94 RDC	293	static int pn_socket_ioctl(struct socket *sock, unsigned int cmd,
	294	unsigned long arg)
	295	{
	296	struct sock *sk = sock->sk;
	297	struct pn_sock *pn = pn_sk(sk);
	298
	299	if (cmd == SIOCPNGETOBJECT) {
	300	struct net_device *dev;
	301	u16 handle;
	302	u8 saddr;
	303
	304	if (get_user(handle, (__u16 __user *)arg))
	305	return -EFAULT;
	306
	307	lock_sock(sk);
	308	if (sk->sk_bound_dev_if)
	309	dev = dev_get_by_index(sock_net(sk),
	310	sk->sk_bound_dev_if);
	311	else
	312	dev = phonet_device_get(sock_net(sk));
	313	if (dev && (dev->flags & IFF_UP))
	314	saddr = phonet_address_get(dev, pn_addr(handle));
	315	else
	316	saddr = PN_NO_ADDR;
	317	release_sock(sk);
	318
	319	if (dev)
	320	dev_put(dev);
	321	if (saddr == PN_NO_ADDR)
	322	return -EHOSTUNREACH;
	323
	324	handle = pn_object(saddr, pn_port(pn->sobject));
	325	return put_user(handle, (__u16 __user *)arg);
	326	}
	327
	328	return sk->sk_prot->ioctl(sk, cmd, arg);
	329	}
	330
9995a32b RDC	331	static int pn_socket_listen(struct socket *sock, int backlog)
	332	{
	333	struct sock *sk = sock->sk;
	334	int err = 0;
	335
	336	if (sock->state != SS_UNCONNECTED)
	337	return -EINVAL;
	338	if (pn_socket_autobind(sock))
	339	return -ENOBUFS;
	340
	341	lock_sock(sk);
	342	if (sk->sk_state != TCP_CLOSE) {
	343	err = -EINVAL;
	344	goto out;
	345	}
	346
	347	sk->sk_state = TCP_LISTEN;
	348	sk->sk_ack_backlog = 0;
	349	sk->sk_max_ack_backlog = backlog;
	350	out:
	351	release_sock(sk);
	352	return err;
	353	}
	354
ba113a94 RDC	355	static int pn_socket_sendmsg(struct kiocb iocb, struct socket sock,
	356	struct msghdr *m, size_t total_len)
	357	{
	358	struct sock *sk = sock->sk;
	359
	360	if (pn_socket_autobind(sock))
	361	return -EAGAIN;
	362
	363	return sk->sk_prot->sendmsg(iocb, sk, m, total_len);
	364	}
	365
	366	const struct proto_ops phonet_dgram_ops = {
	367	.family = AF_PHONET,
	368	.owner = THIS_MODULE,
	369	.release = pn_socket_release,
	370	.bind = pn_socket_bind,
	371	.connect = sock_no_connect,
	372	.socketpair = sock_no_socketpair,
	373	.accept = sock_no_accept,
	374	.getname = pn_socket_getname,
	375	.poll = datagram_poll,
	376	.ioctl = pn_socket_ioctl,
	377	.listen = sock_no_listen,
	378	.shutdown = sock_no_shutdown,
	379	.setsockopt = sock_no_setsockopt,
	380	.getsockopt = sock_no_getsockopt,
	381	#ifdef CONFIG_COMPAT
	382	.compat_setsockopt = sock_no_setsockopt,
	383	.compat_getsockopt = sock_no_getsockopt,
	384	#endif
	385	.sendmsg = pn_socket_sendmsg,
	386	.recvmsg = sock_common_recvmsg,
	387	.mmap = sock_no_mmap,
	388	.sendpage = sock_no_sendpage,
	389	};
	390
9995a32b RDC	391	const struct proto_ops phonet_stream_ops = {
	392	.family = AF_PHONET,
	393	.owner = THIS_MODULE,
	394	.release = pn_socket_release,
	395	.bind = pn_socket_bind,
	396	.connect = sock_no_connect,
	397	.socketpair = sock_no_socketpair,
	398	.accept = pn_socket_accept,
	399	.getname = pn_socket_getname,
	400	.poll = pn_socket_poll,
	401	.ioctl = pn_socket_ioctl,
	402	.listen = pn_socket_listen,
	403	.shutdown = sock_no_shutdown,
02a47617 RDC	404	.setsockopt = sock_common_setsockopt,
02a47617 RDC	405	.getsockopt = sock_common_getsockopt,
9995a32b	406	#ifdef CONFIG_COMPAT
02a47617 RDC	407	.compat_setsockopt = compat_sock_common_setsockopt,
02a47617 RDC	408	.compat_getsockopt = compat_sock_common_getsockopt,
9995a32b RDC	409	#endif
	410	.sendmsg = pn_socket_sendmsg,
	411	.recvmsg = sock_common_recvmsg,
	412	.mmap = sock_no_mmap,
	413	.sendpage = sock_no_sendpage,
	414	};
	415	EXPORT_SYMBOL(phonet_stream_ops);
	416
ba113a94 RDC	417	/* allocate port for a socket */
	418	int pn_sock_get_port(struct sock *sk, unsigned short sport)
	419	{
	420	static int port_cur;
52404881	421	struct net *net = sock_net(sk);
ba113a94 RDC	422	struct pn_sock *pn = pn_sk(sk);
	423	struct sockaddr_pn try_sa;
	424	struct sock *tmpsk;
	425
	426	memset(&try_sa, 0, sizeof(struct sockaddr_pn));
	427	try_sa.spn_family = AF_PHONET;
582b0b61	428	WARN_ON(!mutex_is_locked(&port_mutex));
ba113a94 RDC	429	if (!sport) {
ba113a94 RDC	430	/* search free port */
87ab4e20	431	int port, pmin, pmax;
ba113a94	432
87ab4e20	433	phonet_get_local_port_range(&pmin, &pmax);
ba113a94 RDC	434	for (port = pmin; port <= pmax; port++) {
	435	port_cur++;
	436	if (port_cur < pmin \|\| port_cur > pmax)
	437	port_cur = pmin;
	438
	439	pn_sockaddr_set_port(&try_sa, port_cur);
52404881	440	tmpsk = pn_find_sock_by_sa(net, &try_sa);
ba113a94 RDC	441	if (tmpsk == NULL) {
	442	sport = port_cur;
	443	goto found;
	444	} else
	445	sock_put(tmpsk);
	446	}
	447	} else {
	448	/* try to find specific port */
	449	pn_sockaddr_set_port(&try_sa, sport);
52404881	450	tmpsk = pn_find_sock_by_sa(net, &try_sa);
ba113a94 RDC	451	if (tmpsk == NULL)
	452	/* No sock there! We can use that port... */
	453	goto found;
	454	else
	455	sock_put(tmpsk);
	456	}
ba113a94 RDC	457	/* the port must be in use already */
	458	return -EADDRINUSE;
	459
	460	found:
ba113a94 RDC	461	pn->sobject = pn_object(pn_addr(pn->sobject), sport);
	462	return 0;
	463	}
	464	EXPORT_SYMBOL(pn_sock_get_port);
c1dc13e9	465
ae6e2aef	466	#ifdef CONFIG_PROC_FS
c1dc13e9 RDC	467	static struct sock pn_sock_get_idx(struct seq_file seq, loff_t pos)
	468	{
	469	struct net *net = seq_file_net(seq);
6b0d07ba	470	struct hlist_head *hlist = pnsocks.hlist;
c1dc13e9 RDC	471	struct hlist_node *node;
c1dc13e9 RDC	472	struct sock *sknode;
6b0d07ba	473	unsigned h;
c1dc13e9	474
6b0d07ba RDC	475	for (h = 0; h < PN_HASHSIZE; h++) {
	476	sk_for_each(sknode, node, hlist) {
	477	if (!net_eq(net, sock_net(sknode)))
	478	continue;
	479	if (!pos)
	480	return sknode;
	481	pos--;
	482	}
	483	hlist++;
c1dc13e9 RDC	484	}
	485	return NULL;
	486	}
	487
	488	static struct sock pn_sock_get_next(struct seq_file seq, struct sock *sk)
	489	{
	490	struct net *net = seq_file_net(seq);
	491
	492	do
	493	sk = sk_next(sk);
	494	while (sk && !net_eq(net, sock_net(sk)));
	495
	496	return sk;
	497	}
	498
	499	static void pn_sock_seq_start(struct seq_file seq, loff_t *pos)
	500	__acquires(pnsocks.lock)
	501	{
	502	spin_lock_bh(&pnsocks.lock);
	503	return pos ? pn_sock_get_idx(seq, pos - 1) : SEQ_START_TOKEN;
	504	}
	505
	506	static void pn_sock_seq_next(struct seq_file seq, void v, loff_t pos)
	507	{
	508	struct sock *sk;
	509
	510	if (v == SEQ_START_TOKEN)
	511	sk = pn_sock_get_idx(seq, 0);
	512	else
	513	sk = pn_sock_get_next(seq, v);
	514	(*pos)++;
	515	return sk;
	516	}
	517
	518	static void pn_sock_seq_stop(struct seq_file seq, void v)
	519	__releases(pnsocks.lock)
	520	{
	521	spin_unlock_bh(&pnsocks.lock);
	522	}
	523
	524	static int pn_sock_seq_show(struct seq_file seq, void v)
	525	{
	526	int len;
	527
	528	if (v == SEQ_START_TOKEN)
	529	seq_printf(seq, "%s%n", "pt loc rem rs st tx_queue rx_queue "
	530	" uid inode ref pointer drops", &len);
	531	else {
	532	struct sock *sk = v;
	533	struct pn_sock *pn = pn_sk(sk);
	534
	535	seq_printf(seq, "%2d %04X:%04X:%02X %02X %08X:%08X %5d %lu "
	536	"%d %p %d%n",
	537	sk->sk_protocol, pn->sobject, 0, pn->resource,
	538	sk->sk_state,
	539	sk_wmem_alloc_get(sk), sk_rmem_alloc_get(sk),
	540	sock_i_uid(sk), sock_i_ino(sk),
	541	atomic_read(&sk->sk_refcnt), sk,
	542	atomic_read(&sk->sk_drops), &len);
	543	}
	544	seq_printf(seq, "%*s\n", 127 - len, "");
	545	return 0;
	546	}
	547
548	static const struct seq_operations pn_sock_seq_ops = {
549	.start = pn_sock_seq_start,
550	.next = pn_sock_seq_next,
551	.stop = pn_sock_seq_stop,
552	.show = pn_sock_seq_show,
553	};
554
555	static int pn_sock_open(struct inode inode, struct file file)
556	{
cb7d9e7f RDC	557	return seq_open_net(inode, file, &pn_sock_seq_ops,
cb7d9e7f RDC	558	sizeof(struct seq_net_private));
c1dc13e9 RDC	559	}
	560
	561	const struct file_operations pn_sock_seq_fops = {
	562	.owner = THIS_MODULE,
	563	.open = pn_sock_open,
	564	.read = seq_read,
	565	.llseek = seq_lseek,
cb7d9e7f	566	.release = seq_release_net,
c1dc13e9	567	};
ae6e2aef	568	#endif
4e3d16ce RDC	569
	570	static struct {
	571	struct sock *sk[256];
	572	} pnres;
	573
	574	/*
	575	* Find and hold socket based on resource.
	576	*/
	577	struct sock pn_find_sock_by_res(struct net net, u8 res)
	578	{
	579	struct sock *sk;
	580
	581	if (!net_eq(net, &init_net))
	582	return NULL;
	583
	584	rcu_read_lock();
	585	sk = rcu_dereference(pnres.sk[res]);
	586	if (sk)
	587	sock_hold(sk);
	588	rcu_read_unlock();
	589	return sk;
	590	}
	591
	592	static DEFINE_MUTEX(resource_mutex);
	593
	594	int pn_sock_bind_res(struct sock *sk, u8 res)
	595	{
	596	int ret = -EADDRINUSE;
	597
	598	if (!net_eq(sock_net(sk), &init_net))
	599	return -ENOIOCTLCMD;
	600	if (!capable(CAP_SYS_ADMIN))
	601	return -EPERM;
	602	if (pn_socket_autobind(sk->sk_socket))
	603	return -EAGAIN;
	604
	605	mutex_lock(&resource_mutex);
	606	if (pnres.sk[res] == NULL) {
	607	sock_hold(sk);
	608	rcu_assign_pointer(pnres.sk[res], sk);
	609	ret = 0;
	610	}
	611	mutex_unlock(&resource_mutex);
	612	return ret;
	613	}
	614
	615	int pn_sock_unbind_res(struct sock *sk, u8 res)
	616	{
	617	int ret = -ENOENT;
	618
	619	if (!capable(CAP_SYS_ADMIN))
	620	return -EPERM;
	621
	622	mutex_lock(&resource_mutex);
	623	if (pnres.sk[res] == sk) {
	624	rcu_assign_pointer(pnres.sk[res], NULL);
	625	ret = 0;
	626	}
	627	mutex_unlock(&resource_mutex);
	628
	629	if (ret == 0) {
	630	synchronize_rcu();
	631	sock_put(sk);
	632	}
633	return ret;
634	}
635
636	void pn_sock_unbind_all_res(struct sock *sk)
637	{
638	unsigned res, match = 0;
639
640	mutex_lock(&resource_mutex);
641	for (res = 0; res < 256; res++) {
642	if (pnres.sk[res] == sk) {
643	rcu_assign_pointer(pnres.sk[res], NULL);
644	match++;
645	}
646	}
647	mutex_unlock(&resource_mutex);
648
649	if (match == 0)
650	return;
651	synchronize_rcu();
652	while (match > 0) {
653	sock_put(sk);
654	match--;
655	}
656	}
507215f8 RDC	657
	658	#ifdef CONFIG_PROC_FS
	659	static struct sock *pn_res_get_idx(struct seq_file seq, loff_t pos)
	660	{
	661	struct net *net = seq_file_net(seq);
	662	unsigned i;
	663
	664	if (!net_eq(net, &init_net))
	665	return NULL;
	666
	667	for (i = 0; i < 256; i++) {
	668	if (pnres.sk[i] == NULL)
	669	continue;
	670	if (!pos)
	671	return pnres.sk + i;
	672	pos--;
	673	}
	674	return NULL;
	675	}
	676
	677	static struct sock *pn_res_get_next(struct seq_file seq, struct sock **sk)
	678	{
	679	struct net *net = seq_file_net(seq);
	680	unsigned i;
	681
	682	BUG_ON(!net_eq(net, &init_net));
	683
	684	for (i = (sk - pnres.sk) + 1; i < 256; i++)
	685	if (pnres.sk[i])
	686	return pnres.sk + i;
	687	return NULL;
	688	}
	689
	690	static void pn_res_seq_start(struct seq_file seq, loff_t *pos)
	691	__acquires(resource_mutex)
	692	{
	693	mutex_lock(&resource_mutex);
	694	return pos ? pn_res_get_idx(seq, pos - 1) : SEQ_START_TOKEN;
	695	}
	696
	697	static void pn_res_seq_next(struct seq_file seq, void v, loff_t pos)
	698	{
	699	struct sock **sk;
	700
	701	if (v == SEQ_START_TOKEN)
	702	sk = pn_res_get_idx(seq, 0);
	703	else
	704	sk = pn_res_get_next(seq, v);
	705	(*pos)++;
	706	return sk;
	707	}
	708
	709	static void pn_res_seq_stop(struct seq_file seq, void v)
	710	__releases(resource_mutex)
	711	{
	712	mutex_unlock(&resource_mutex);
	713	}
	714
	715	static int pn_res_seq_show(struct seq_file seq, void v)
	716	{
	717	int len;
	718
	719	if (v == SEQ_START_TOKEN)
	720	seq_printf(seq, "%s%n", "rs uid inode", &len);
721	else {
722	struct sock **psk = v;
723	struct sock sk = psk;
724
725	seq_printf(seq, "%02X %5d %lu%n",
9e0064a5 DM	726	(int) (psk - pnres.sk), sock_i_uid(sk),
9e0064a5 DM	727	sock_i_ino(sk), &len);
507215f8 RDC	728	}
	729	seq_printf(seq, "%*s\n", 63 - len, "");
	730	return 0;
	731	}
	732
	733	static const struct seq_operations pn_res_seq_ops = {
	734	.start = pn_res_seq_start,
	735	.next = pn_res_seq_next,
	736	.stop = pn_res_seq_stop,
	737	.show = pn_res_seq_show,
	738	};
	739
	740	static int pn_res_open(struct inode inode, struct file file)
	741	{
	742	return seq_open_net(inode, file, &pn_res_seq_ops,
	743	sizeof(struct seq_net_private));
	744	}
	745
	746	const struct file_operations pn_res_seq_fops = {
	747	.owner = THIS_MODULE,
	748	.open = pn_res_open,
	749	.read = seq_read,
	750	.llseek = seq_lseek,
	751	.release = seq_release_net,
	752	};
	753	#endif