[deliverable/linux.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/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;
}

/* Deliver a broadcast packet (only in bottom-half) */
void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb)
{
	struct hlist_node *node;
	struct sock *sknode;

	spin_lock(&pnsocks.lock);
	sk_for_each(sknode, node, &pnsocks.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)
			sk_receive_skb(sknode, clone, 0);
	}
	spin_unlock(&pnsocks.lock);
}

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
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
	26	#include <linux/kernel.h>
	27	#include <linux/net.h>
9995a32b	28	#include <linux/poll.h>
ba113a94 RDC	29	#include <net/sock.h>
	30	#include <net/tcp_states.h>
	31
	32	#include <linux/phonet.h>
	33	#include <net/phonet/phonet.h>
9995a32b	34	#include <net/phonet/pep.h>
ba113a94 RDC	35	#include <net/phonet/pn_dev.h>
	36
	37	static int pn_socket_release(struct socket *sock)
	38	{
	39	struct sock *sk = sock->sk;
	40
	41	if (sk) {
	42	sock->sk = NULL;
	43	sk->sk_prot->close(sk, 0);
	44	}
	45	return 0;
	46	}
	47
	48	static struct {
	49	struct hlist_head hlist;
	50	spinlock_t lock;
	51	} pnsocks = {
	52	.hlist = HLIST_HEAD_INIT,
	53	.lock = __SPIN_LOCK_UNLOCKED(pnsocks.lock),
	54	};
	55
	56	/*
	57	* Find address based on socket address, match only certain fields.
	58	* Also grab sock if it was found. Remember to sock_put it later.
	59	*/
52404881	60	struct sock pn_find_sock_by_sa(struct net net, const struct sockaddr_pn *spn)
ba113a94 RDC	61	{
	62	struct hlist_node *node;
	63	struct sock *sknode;
	64	struct sock *rval = NULL;
	65	u16 obj = pn_sockaddr_get_object(spn);
	66	u8 res = spn->spn_resource;
	67
	68	spin_lock_bh(&pnsocks.lock);
	69
	70	sk_for_each(sknode, node, &pnsocks.hlist) {
	71	struct pn_sock *pn = pn_sk(sknode);
	72	BUG_ON(!pn->sobject); /* unbound socket */
	73
52404881 RDC	74	if (!net_eq(sock_net(sknode), net))
52404881 RDC	75	continue;
ba113a94 RDC	76	if (pn_port(obj)) {
	77	/* Look up socket by port */
	78	if (pn_port(pn->sobject) != pn_port(obj))
	79	continue;
	80	} else {
	81	/* If port is zero, look up by resource */
	82	if (pn->resource != res)
	83	continue;
	84	}
	85	if (pn_addr(pn->sobject)
	86	&& pn_addr(pn->sobject) != pn_addr(obj))
	87	continue;
	88
	89	rval = sknode;
	90	sock_hold(sknode);
	91	break;
	92	}
	93
	94	spin_unlock_bh(&pnsocks.lock);
	95
	96	return rval;
f14001fc RDC	97	}
	98
	99	/* Deliver a broadcast packet (only in bottom-half) */
	100	void pn_deliver_sock_broadcast(struct net net, struct sk_buff skb)
	101	{
	102	struct hlist_node *node;
	103	struct sock *sknode;
	104
	105	spin_lock(&pnsocks.lock);
	106	sk_for_each(sknode, node, &pnsocks.hlist) {
	107	struct sk_buff *clone;
	108
	109	if (!net_eq(sock_net(sknode), net))
	110	continue;
	111	if (!sock_flag(sknode, SOCK_BROADCAST))
	112	continue;
ba113a94	113
f14001fc RDC	114	clone = skb_clone(skb, GFP_ATOMIC);
	115	if (clone)
	116	sk_receive_skb(sknode, clone, 0);
	117	}
	118	spin_unlock(&pnsocks.lock);
ba113a94 RDC	119	}
	120
	121	void pn_sock_hash(struct sock *sk)
	122	{
	123	spin_lock_bh(&pnsocks.lock);
	124	sk_add_node(sk, &pnsocks.hlist);
	125	spin_unlock_bh(&pnsocks.lock);
	126	}
	127	EXPORT_SYMBOL(pn_sock_hash);
	128
	129	void pn_sock_unhash(struct sock *sk)
	130	{
	131	spin_lock_bh(&pnsocks.lock);
	132	sk_del_node_init(sk);
	133	spin_unlock_bh(&pnsocks.lock);
	134	}
	135	EXPORT_SYMBOL(pn_sock_unhash);
	136
582b0b61 RDC	137	static DEFINE_MUTEX(port_mutex);
582b0b61 RDC	138
ba113a94 RDC	139	static int pn_socket_bind(struct socket sock, struct sockaddr addr, int len)
	140	{
	141	struct sock *sk = sock->sk;
	142	struct pn_sock *pn = pn_sk(sk);
	143	struct sockaddr_pn spn = (struct sockaddr_pn )addr;
	144	int err;
	145	u16 handle;
	146	u8 saddr;
	147
	148	if (sk->sk_prot->bind)
	149	return sk->sk_prot->bind(sk, addr, len);
	150
	151	if (len < sizeof(struct sockaddr_pn))
	152	return -EINVAL;
	153	if (spn->spn_family != AF_PHONET)
	154	return -EAFNOSUPPORT;
	155
	156	handle = pn_sockaddr_get_object((struct sockaddr_pn *)addr);
	157	saddr = pn_addr(handle);
52404881	158	if (saddr && phonet_address_lookup(sock_net(sk), saddr))
ba113a94 RDC	159	return -EADDRNOTAVAIL;
	160
	161	lock_sock(sk);
	162	if (sk->sk_state != TCP_CLOSE \|\| pn_port(pn->sobject)) {
	163	err = -EINVAL; /* attempt to rebind */
	164	goto out;
	165	}
582b0b61 RDC	166	WARN_ON(sk_hashed(sk));
582b0b61 RDC	167	mutex_lock(&port_mutex);
ba113a94 RDC	168	err = sk->sk_prot->get_port(sk, pn_port(handle));
ba113a94 RDC	169	if (err)
582b0b61	170	goto out_port;
ba113a94 RDC	171
	172	/* get_port() sets the port, bind() sets the address if applicable */
	173	pn->sobject = pn_object(saddr, pn_port(pn->sobject));
	174	pn->resource = spn->spn_resource;
	175
	176	/* Enable RX on the socket */
	177	sk->sk_prot->hash(sk);
582b0b61 RDC	178	out_port:
582b0b61 RDC	179	mutex_unlock(&port_mutex);
ba113a94 RDC	180	out:
	181	release_sock(sk);
	182	return err;
	183	}
	184
	185	static int pn_socket_autobind(struct socket *sock)
	186	{
	187	struct sockaddr_pn sa;
	188	int err;
	189
	190	memset(&sa, 0, sizeof(sa));
	191	sa.spn_family = AF_PHONET;
	192	err = pn_socket_bind(sock, (struct sockaddr *)&sa,
	193	sizeof(struct sockaddr_pn));
	194	if (err != -EINVAL)
	195	return err;
	196	BUG_ON(!pn_port(pn_sk(sock->sk)->sobject));
	197	return 0; /* socket was already bound */
	198	}
	199
9995a32b RDC	200	static int pn_socket_accept(struct socket sock, struct socket newsock,
	201	int flags)
	202	{
	203	struct sock *sk = sock->sk;
	204	struct sock *newsk;
	205	int err;
	206
	207	newsk = sk->sk_prot->accept(sk, flags, &err);
	208	if (!newsk)
	209	return err;
	210
	211	lock_sock(newsk);
	212	sock_graft(newsk, newsock);
	213	newsock->state = SS_CONNECTED;
	214	release_sock(newsk);
	215	return 0;
	216	}
	217
ba113a94 RDC	218	static int pn_socket_getname(struct socket sock, struct sockaddr addr,
	219	int *sockaddr_len, int peer)
	220	{
	221	struct sock *sk = sock->sk;
	222	struct pn_sock *pn = pn_sk(sk);
	223
	224	memset(addr, 0, sizeof(struct sockaddr_pn));
	225	addr->sa_family = AF_PHONET;
	226	if (!peer) /* Race with bind() here is userland's problem. */
	227	pn_sockaddr_set_object((struct sockaddr_pn *)addr,
	228	pn->sobject);
	229
	230	*sockaddr_len = sizeof(struct sockaddr_pn);
	231	return 0;
	232	}
	233
9995a32b RDC	234	static unsigned int pn_socket_poll(struct file file, struct socket sock,
	235	poll_table *wait)
	236	{
	237	struct sock *sk = sock->sk;
	238	struct pep_sock *pn = pep_sk(sk);
	239	unsigned int mask = 0;
	240
	241	poll_wait(file, &sock->wait, wait);
	242
	243	switch (sk->sk_state) {
	244	case TCP_LISTEN:
	245	return hlist_empty(&pn->ackq) ? 0 : POLLIN;
	246	case TCP_CLOSE:
	247	return POLLERR;
	248	}
	249
	250	if (!skb_queue_empty(&sk->sk_receive_queue))
	251	mask \|= POLLIN \| POLLRDNORM;
c41bd97f RDC	252	if (!skb_queue_empty(&pn->ctrlreq_queue))
	253	mask \|= POLLPRI;
	254	if (!mask && sk->sk_state == TCP_CLOSE_WAIT)
9995a32b RDC	255	return POLLHUP;
9995a32b RDC	256
be677730	257	if (sk->sk_state == TCP_ESTABLISHED && atomic_read(&pn->tx_credits))
9995a32b RDC	258	mask \|= POLLOUT \| POLLWRNORM \| POLLWRBAND;
	259
	260	return mask;
	261	}
	262
ba113a94 RDC	263	static int pn_socket_ioctl(struct socket *sock, unsigned int cmd,
	264	unsigned long arg)
	265	{
	266	struct sock *sk = sock->sk;
	267	struct pn_sock *pn = pn_sk(sk);
	268
	269	if (cmd == SIOCPNGETOBJECT) {
	270	struct net_device *dev;
	271	u16 handle;
	272	u8 saddr;
	273
	274	if (get_user(handle, (__u16 __user *)arg))
	275	return -EFAULT;
	276
	277	lock_sock(sk);
	278	if (sk->sk_bound_dev_if)
	279	dev = dev_get_by_index(sock_net(sk),
	280	sk->sk_bound_dev_if);
	281	else
	282	dev = phonet_device_get(sock_net(sk));
	283	if (dev && (dev->flags & IFF_UP))
	284	saddr = phonet_address_get(dev, pn_addr(handle));
	285	else
	286	saddr = PN_NO_ADDR;
	287	release_sock(sk);
	288
	289	if (dev)
	290	dev_put(dev);
	291	if (saddr == PN_NO_ADDR)
	292	return -EHOSTUNREACH;
	293
	294	handle = pn_object(saddr, pn_port(pn->sobject));
	295	return put_user(handle, (__u16 __user *)arg);
	296	}
	297
	298	return sk->sk_prot->ioctl(sk, cmd, arg);
	299	}
	300
9995a32b RDC	301	static int pn_socket_listen(struct socket *sock, int backlog)
	302	{
	303	struct sock *sk = sock->sk;
	304	int err = 0;
	305
	306	if (sock->state != SS_UNCONNECTED)
	307	return -EINVAL;
	308	if (pn_socket_autobind(sock))
	309	return -ENOBUFS;
	310
	311	lock_sock(sk);
	312	if (sk->sk_state != TCP_CLOSE) {
	313	err = -EINVAL;
	314	goto out;
	315	}
	316
	317	sk->sk_state = TCP_LISTEN;
	318	sk->sk_ack_backlog = 0;
	319	sk->sk_max_ack_backlog = backlog;
	320	out:
	321	release_sock(sk);
	322	return err;
	323	}
	324
ba113a94 RDC	325	static int pn_socket_sendmsg(struct kiocb iocb, struct socket sock,
	326	struct msghdr *m, size_t total_len)
	327	{
	328	struct sock *sk = sock->sk;
	329
	330	if (pn_socket_autobind(sock))
	331	return -EAGAIN;
	332
	333	return sk->sk_prot->sendmsg(iocb, sk, m, total_len);
	334	}
	335
	336	const struct proto_ops phonet_dgram_ops = {
	337	.family = AF_PHONET,
	338	.owner = THIS_MODULE,
	339	.release = pn_socket_release,
	340	.bind = pn_socket_bind,
	341	.connect = sock_no_connect,
	342	.socketpair = sock_no_socketpair,
	343	.accept = sock_no_accept,
	344	.getname = pn_socket_getname,
	345	.poll = datagram_poll,
	346	.ioctl = pn_socket_ioctl,
	347	.listen = sock_no_listen,
	348	.shutdown = sock_no_shutdown,
	349	.setsockopt = sock_no_setsockopt,
	350	.getsockopt = sock_no_getsockopt,
	351	#ifdef CONFIG_COMPAT
	352	.compat_setsockopt = sock_no_setsockopt,
	353	.compat_getsockopt = sock_no_getsockopt,
	354	#endif
	355	.sendmsg = pn_socket_sendmsg,
	356	.recvmsg = sock_common_recvmsg,
	357	.mmap = sock_no_mmap,
	358	.sendpage = sock_no_sendpage,
	359	};
	360
9995a32b RDC	361	const struct proto_ops phonet_stream_ops = {
	362	.family = AF_PHONET,
	363	.owner = THIS_MODULE,
	364	.release = pn_socket_release,
	365	.bind = pn_socket_bind,
	366	.connect = sock_no_connect,
	367	.socketpair = sock_no_socketpair,
	368	.accept = pn_socket_accept,
	369	.getname = pn_socket_getname,
	370	.poll = pn_socket_poll,
	371	.ioctl = pn_socket_ioctl,
	372	.listen = pn_socket_listen,
	373	.shutdown = sock_no_shutdown,
02a47617 RDC	374	.setsockopt = sock_common_setsockopt,
02a47617 RDC	375	.getsockopt = sock_common_getsockopt,
9995a32b	376	#ifdef CONFIG_COMPAT
02a47617 RDC	377	.compat_setsockopt = compat_sock_common_setsockopt,
02a47617 RDC	378	.compat_getsockopt = compat_sock_common_getsockopt,
9995a32b RDC	379	#endif
	380	.sendmsg = pn_socket_sendmsg,
	381	.recvmsg = sock_common_recvmsg,
	382	.mmap = sock_no_mmap,
	383	.sendpage = sock_no_sendpage,
	384	};
	385	EXPORT_SYMBOL(phonet_stream_ops);
	386
ba113a94 RDC	387	/* allocate port for a socket */
	388	int pn_sock_get_port(struct sock *sk, unsigned short sport)
	389	{
	390	static int port_cur;
52404881	391	struct net *net = sock_net(sk);
ba113a94 RDC	392	struct pn_sock *pn = pn_sk(sk);
	393	struct sockaddr_pn try_sa;
	394	struct sock *tmpsk;
	395
	396	memset(&try_sa, 0, sizeof(struct sockaddr_pn));
	397	try_sa.spn_family = AF_PHONET;
582b0b61	398	WARN_ON(!mutex_is_locked(&port_mutex));
ba113a94 RDC	399	if (!sport) {
ba113a94 RDC	400	/* search free port */
87ab4e20	401	int port, pmin, pmax;
ba113a94	402
87ab4e20	403	phonet_get_local_port_range(&pmin, &pmax);
ba113a94 RDC	404	for (port = pmin; port <= pmax; port++) {
	405	port_cur++;
	406	if (port_cur < pmin \|\| port_cur > pmax)
	407	port_cur = pmin;
	408
	409	pn_sockaddr_set_port(&try_sa, port_cur);
52404881	410	tmpsk = pn_find_sock_by_sa(net, &try_sa);
ba113a94 RDC	411	if (tmpsk == NULL) {
	412	sport = port_cur;
	413	goto found;
	414	} else
	415	sock_put(tmpsk);
	416	}
	417	} else {
	418	/* try to find specific port */
	419	pn_sockaddr_set_port(&try_sa, sport);
52404881	420	tmpsk = pn_find_sock_by_sa(net, &try_sa);
ba113a94 RDC	421	if (tmpsk == NULL)
	422	/* No sock there! We can use that port... */
	423	goto found;
	424	else
	425	sock_put(tmpsk);
	426	}
ba113a94 RDC	427	/* the port must be in use already */
	428	return -EADDRINUSE;
	429
	430	found:
ba113a94 RDC	431	pn->sobject = pn_object(pn_addr(pn->sobject), sport);
	432	return 0;
	433	}
	434	EXPORT_SYMBOL(pn_sock_get_port);
c1dc13e9	435
ae6e2aef	436	#ifdef CONFIG_PROC_FS
c1dc13e9 RDC	437	static struct sock pn_sock_get_idx(struct seq_file seq, loff_t pos)
	438	{
	439	struct net *net = seq_file_net(seq);
	440	struct hlist_node *node;
	441	struct sock *sknode;
	442
	443	sk_for_each(sknode, node, &pnsocks.hlist) {
	444	if (!net_eq(net, sock_net(sknode)))
	445	continue;
	446	if (!pos)
	447	return sknode;
	448	pos--;
	449	}
	450	return NULL;
	451	}
	452
	453	static struct sock pn_sock_get_next(struct seq_file seq, struct sock *sk)
	454	{
	455	struct net *net = seq_file_net(seq);
	456
	457	do
	458	sk = sk_next(sk);
	459	while (sk && !net_eq(net, sock_net(sk)));
	460
	461	return sk;
	462	}
	463
	464	static void pn_sock_seq_start(struct seq_file seq, loff_t *pos)
	465	__acquires(pnsocks.lock)
	466	{
	467	spin_lock_bh(&pnsocks.lock);
	468	return pos ? pn_sock_get_idx(seq, pos - 1) : SEQ_START_TOKEN;
	469	}
	470
	471	static void pn_sock_seq_next(struct seq_file seq, void v, loff_t pos)
	472	{
	473	struct sock *sk;
	474
	475	if (v == SEQ_START_TOKEN)
	476	sk = pn_sock_get_idx(seq, 0);
	477	else
	478	sk = pn_sock_get_next(seq, v);
	479	(*pos)++;
	480	return sk;
	481	}
	482
	483	static void pn_sock_seq_stop(struct seq_file seq, void v)
	484	__releases(pnsocks.lock)
	485	{
	486	spin_unlock_bh(&pnsocks.lock);
	487	}
	488
	489	static int pn_sock_seq_show(struct seq_file seq, void v)
	490	{
	491	int len;
	492
	493	if (v == SEQ_START_TOKEN)
	494	seq_printf(seq, "%s%n", "pt loc rem rs st tx_queue rx_queue "
	495	" uid inode ref pointer drops", &len);
	496	else {
	497	struct sock *sk = v;
	498	struct pn_sock *pn = pn_sk(sk);
	499
	500	seq_printf(seq, "%2d %04X:%04X:%02X %02X %08X:%08X %5d %lu "
501	"%d %p %d%n",
502	sk->sk_protocol, pn->sobject, 0, pn->resource,
503	sk->sk_state,
504	sk_wmem_alloc_get(sk), sk_rmem_alloc_get(sk),
505	sock_i_uid(sk), sock_i_ino(sk),
506	atomic_read(&sk->sk_refcnt), sk,
507	atomic_read(&sk->sk_drops), &len);
508	}
509	seq_printf(seq, "%*s\n", 127 - len, "");
510	return 0;
511	}
512
513	static const struct seq_operations pn_sock_seq_ops = {
514	.start = pn_sock_seq_start,
515	.next = pn_sock_seq_next,
516	.stop = pn_sock_seq_stop,
517	.show = pn_sock_seq_show,
518	};
519
520	static int pn_sock_open(struct inode inode, struct file file)
521	{
cb7d9e7f RDC	522	return seq_open_net(inode, file, &pn_sock_seq_ops,
cb7d9e7f RDC	523	sizeof(struct seq_net_private));
c1dc13e9 RDC	524	}
	525
	526	const struct file_operations pn_sock_seq_fops = {
	527	.owner = THIS_MODULE,
	528	.open = pn_sock_open,
	529	.read = seq_read,
	530	.llseek = seq_lseek,
cb7d9e7f	531	.release = seq_release_net,
c1dc13e9	532	};
ae6e2aef	533	#endif