[mirror_ubuntu-artful-kernel.git] / net / phonet / datagram.c

/*
 * File: datagram.c
 *
 * Datagram (ISI) Phonet sockets
 *
 * Copyright (C) 2008 Nokia Corporation.
 *
 * Authors: Sakari Ailus <sakari.ailus@nokia.com>
 *          Rémi Denis-Courmont
 *
 * 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/slab.h>
#include <linux/socket.h>
#include <asm/ioctls.h>
#include <net/sock.h>

#include <linux/phonet.h>
#include <linux/export.h>
#include <net/phonet/phonet.h>

static int pn_backlog_rcv(struct sock *sk, struct sk_buff *skb);

/* associated socket ceases to exist */
static void pn_sock_close(struct sock *sk, long timeout)
{
	sk_common_release(sk);
}

static int pn_ioctl(struct sock *sk, int cmd, unsigned long arg)
{
	struct sk_buff *skb;
	int answ;

	switch (cmd) {
	case SIOCINQ:
		lock_sock(sk);
		skb = skb_peek(&sk->sk_receive_queue);
		answ = skb ? skb->len : 0;
		release_sock(sk);
		return put_user(answ, (int __user *)arg);

	case SIOCPNADDRESOURCE:
	case SIOCPNDELRESOURCE: {
			u32 res;
			if (get_user(res, (u32 __user *)arg))
				return -EFAULT;
			if (res >= 256)
				return -EINVAL;
			if (cmd == SIOCPNADDRESOURCE)
				return pn_sock_bind_res(sk, res);
			else
				return pn_sock_unbind_res(sk, res);
		}
	}

	return -ENOIOCTLCMD;
}

/* Destroy socket. All references are gone. */
static void pn_destruct(struct sock *sk)
{
	skb_queue_purge(&sk->sk_receive_queue);
}

static int pn_init(struct sock *sk)
{
	sk->sk_destruct = pn_destruct;
	return 0;
}

static int pn_sendmsg(struct kiocb *iocb, struct sock *sk,
			struct msghdr *msg, size_t len)
{
	DECLARE_SOCKADDR(struct sockaddr_pn *, target, msg->msg_name);
	struct sk_buff *skb;
	int err;

	if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|
				MSG_CMSG_COMPAT))
		return -EOPNOTSUPP;

	if (target == NULL)
		return -EDESTADDRREQ;

	if (msg->msg_namelen < sizeof(struct sockaddr_pn))
		return -EINVAL;

	if (target->spn_family != AF_PHONET)
		return -EAFNOSUPPORT;

	skb = sock_alloc_send_skb(sk, MAX_PHONET_HEADER + len,
					msg->msg_flags & MSG_DONTWAIT, &err);
	if (skb == NULL)
		return err;
	skb_reserve(skb, MAX_PHONET_HEADER);

	err = memcpy_from_msg((void *)skb_put(skb, len), msg, len);
	if (err < 0) {
		kfree_skb(skb);
		return err;
	}

	/*
	 * Fill in the Phonet header and
	 * finally pass the packet forwards.
	 */
	err = pn_skb_send(sk, skb, target);

	/* If ok, return len. */
	return (err >= 0) ? len : err;
}

static int pn_recvmsg(struct kiocb *iocb, struct sock *sk,
			struct msghdr *msg, size_t len, int noblock,
			int flags, int *addr_len)
{
	struct sk_buff *skb = NULL;
	struct sockaddr_pn sa;
	int rval = -EOPNOTSUPP;
	int copylen;

	if (flags & ~(MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_NOSIGNAL|
			MSG_CMSG_COMPAT))
		goto out_nofree;

	skb = skb_recv_datagram(sk, flags, noblock, &rval);
	if (skb == NULL)
		goto out_nofree;

	pn_skb_get_src_sockaddr(skb, &sa);

	copylen = skb->len;
	if (len < copylen) {
		msg->msg_flags |= MSG_TRUNC;
		copylen = len;
	}

	rval = skb_copy_datagram_msg(skb, 0, msg, copylen);
	if (rval) {
		rval = -EFAULT;
		goto out;
	}

	rval = (flags & MSG_TRUNC) ? skb->len : copylen;

	if (msg->msg_name != NULL) {
		__sockaddr_check_size(sizeof(sa));
		memcpy(msg->msg_name, &sa, sizeof(sa));
		*addr_len = sizeof(sa);
	}

out:
	skb_free_datagram(sk, skb);

out_nofree:
	return rval;
}

/* Queue an skb for a sock. */
static int pn_backlog_rcv(struct sock *sk, struct sk_buff *skb)
{
	int err = sock_queue_rcv_skb(sk, skb);

	if (err < 0)
		kfree_skb(skb);
	return err ? NET_RX_DROP : NET_RX_SUCCESS;
}

/* Module registration */
static struct proto pn_proto = {
	.close		= pn_sock_close,
	.ioctl		= pn_ioctl,
	.init		= pn_init,
	.sendmsg	= pn_sendmsg,
	.recvmsg	= pn_recvmsg,
	.backlog_rcv	= pn_backlog_rcv,
	.hash		= pn_sock_hash,
	.unhash		= pn_sock_unhash,
	.get_port	= pn_sock_get_port,
	.obj_size	= sizeof(struct pn_sock),
	.owner		= THIS_MODULE,
	.name		= "PHONET",
};

static struct phonet_protocol pn_dgram_proto = {
	.ops		= &phonet_dgram_ops,
	.prot		= &pn_proto,
	.sock_type	= SOCK_DGRAM,
};

int __init isi_register(void)
{
	return phonet_proto_register(PN_PROTO_PHONET, &pn_dgram_proto);
}

void __exit isi_unregister(void)
{
	phonet_proto_unregister(PN_PROTO_PHONET, &pn_dgram_proto);
}
Commit	Line	Data
107d0d9b RDC	1	/*
	2	* File: datagram.c
	3	*
	4	* Datagram (ISI) Phonet sockets
	5	*
	6	* Copyright (C) 2008 Nokia Corporation.
	7	*
31fdc555 RDC	8	* Authors: Sakari Ailus <sakari.ailus@nokia.com>
31fdc555 RDC	9	* Rémi Denis-Courmont
107d0d9b RDC	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>
5a0e3ad6	27	#include <linux/slab.h>
107d0d9b RDC	28	#include <linux/socket.h>
	29	#include <asm/ioctls.h>
	30	#include <net/sock.h>
	31
	32	#include <linux/phonet.h>
bc3b2d7f	33	#include <linux/export.h>
107d0d9b RDC	34	#include <net/phonet/phonet.h>
	35
	36	static int pn_backlog_rcv(struct sock sk, struct sk_buff skb);
	37
	38	/* associated socket ceases to exist */
	39	static void pn_sock_close(struct sock *sk, long timeout)
	40	{
	41	sk_common_release(sk);
	42	}
	43
	44	static int pn_ioctl(struct sock *sk, int cmd, unsigned long arg)
	45	{
	46	struct sk_buff *skb;
	47	int answ;
	48
	49	switch (cmd) {
	50	case SIOCINQ:
	51	lock_sock(sk);
	52	skb = skb_peek(&sk->sk_receive_queue);
	53	answ = skb ? skb->len : 0;
	54	release_sock(sk);
	55	return put_user(answ, (int __user *)arg);
7417fa83 RDC	56
	57	case SIOCPNADDRESOURCE:
	58	case SIOCPNDELRESOURCE: {
	59	u32 res;
	60	if (get_user(res, (u32 __user *)arg))
	61	return -EFAULT;
	62	if (res >= 256)
	63	return -EINVAL;
	64	if (cmd == SIOCPNADDRESOURCE)
	65	return pn_sock_bind_res(sk, res);
	66	else
	67	return pn_sock_unbind_res(sk, res);
	68	}
107d0d9b RDC	69	}
	70
	71	return -ENOIOCTLCMD;
	72	}
	73
	74	/* Destroy socket. All references are gone. */
	75	static void pn_destruct(struct sock *sk)
	76	{
	77	skb_queue_purge(&sk->sk_receive_queue);
	78	}
	79
	80	static int pn_init(struct sock *sk)
	81	{
	82	sk->sk_destruct = pn_destruct;
	83	return 0;
	84	}
	85
	86	static int pn_sendmsg(struct kiocb iocb, struct sock sk,
	87	struct msghdr *msg, size_t len)
	88	{
342dfc30	89	DECLARE_SOCKADDR(struct sockaddr_pn *, target, msg->msg_name);
107d0d9b RDC	90	struct sk_buff *skb;
	91	int err;
	92
82ecbcb9 RDC	93	if (msg->msg_flags & ~(MSG_DONTWAIT\|MSG_EOR\|MSG_NOSIGNAL\|
82ecbcb9 RDC	94	MSG_CMSG_COMPAT))
107d0d9b RDC	95	return -EOPNOTSUPP;
107d0d9b RDC	96
342dfc30	97	if (target == NULL)
107d0d9b RDC	98	return -EDESTADDRREQ;
	99
	100	if (msg->msg_namelen < sizeof(struct sockaddr_pn))
	101	return -EINVAL;
	102
107d0d9b RDC	103	if (target->spn_family != AF_PHONET)
	104	return -EAFNOSUPPORT;
	105
	106	skb = sock_alloc_send_skb(sk, MAX_PHONET_HEADER + len,
	107	msg->msg_flags & MSG_DONTWAIT, &err);
	108	if (skb == NULL)
	109	return err;
	110	skb_reserve(skb, MAX_PHONET_HEADER);
	111
6ce8e9ce	112	err = memcpy_from_msg((void *)skb_put(skb, len), msg, len);
107d0d9b RDC	113	if (err < 0) {
	114	kfree_skb(skb);
	115	return err;
	116	}
	117
	118	/*
	119	* Fill in the Phonet header and
	120	* finally pass the packet forwards.
	121	*/
	122	err = pn_skb_send(sk, skb, target);
	123
	124	/* If ok, return len. */
	125	return (err >= 0) ? len : err;
	126	}
	127
	128	static int pn_recvmsg(struct kiocb iocb, struct sock sk,
	129	struct msghdr *msg, size_t len, int noblock,
	130	int flags, int *addr_len)
	131	{
	132	struct sk_buff *skb = NULL;
	133	struct sockaddr_pn sa;
	134	int rval = -EOPNOTSUPP;
	135	int copylen;
	136
82ecbcb9 RDC	137	if (flags & ~(MSG_PEEK\|MSG_TRUNC\|MSG_DONTWAIT\|MSG_NOSIGNAL\|
82ecbcb9 RDC	138	MSG_CMSG_COMPAT))
107d0d9b RDC	139	goto out_nofree;
107d0d9b RDC	140
107d0d9b RDC	141	skb = skb_recv_datagram(sk, flags, noblock, &rval);
	142	if (skb == NULL)
	143	goto out_nofree;
	144
	145	pn_skb_get_src_sockaddr(skb, &sa);
	146
	147	copylen = skb->len;
	148	if (len < copylen) {
	149	msg->msg_flags \|= MSG_TRUNC;
	150	copylen = len;
	151	}
	152
51f3d02b	153	rval = skb_copy_datagram_msg(skb, 0, msg, copylen);
107d0d9b RDC	154	if (rval) {
	155	rval = -EFAULT;
	156	goto out;
	157	}
	158
	159	rval = (flags & MSG_TRUNC) ? skb->len : copylen;
	160
bceaa902	161	if (msg->msg_name != NULL) {
342dfc30	162	__sockaddr_check_size(sizeof(sa));
bceaa902 HFS	163	memcpy(msg->msg_name, &sa, sizeof(sa));
	164	*addr_len = sizeof(sa);
	165	}
107d0d9b RDC	166
	167	out:
	168	skb_free_datagram(sk, skb);
	169
	170	out_nofree:
	171	return rval;
	172	}
	173
	174	/* Queue an skb for a sock. */
	175	static int pn_backlog_rcv(struct sock sk, struct sk_buff skb)
	176	{
	177	int err = sock_queue_rcv_skb(sk, skb);
766e9037 ED	178
766e9037 ED	179	if (err < 0)
107d0d9b RDC	180	kfree_skb(skb);
	181	return err ? NET_RX_DROP : NET_RX_SUCCESS;
	182	}
	183
	184	/* Module registration */
	185	static struct proto pn_proto = {
	186	.close = pn_sock_close,
	187	.ioctl = pn_ioctl,
	188	.init = pn_init,
	189	.sendmsg = pn_sendmsg,
	190	.recvmsg = pn_recvmsg,
	191	.backlog_rcv = pn_backlog_rcv,
	192	.hash = pn_sock_hash,
	193	.unhash = pn_sock_unhash,
	194	.get_port = pn_sock_get_port,
	195	.obj_size = sizeof(struct pn_sock),
	196	.owner = THIS_MODULE,
	197	.name = "PHONET",
	198	};
	199
	200	static struct phonet_protocol pn_dgram_proto = {
	201	.ops = &phonet_dgram_ops,
	202	.prot = &pn_proto,
	203	.sock_type = SOCK_DGRAM,
	204	};
	205
	206	int __init isi_register(void)
	207	{
	208	return phonet_proto_register(PN_PROTO_PHONET, &pn_dgram_proto);
	209	}
	210
	211	void __exit isi_unregister(void)
	212	{
	213	phonet_proto_unregister(PN_PROTO_PHONET, &pn_dgram_proto);
	214	}