[linux.git] / net / ipv6 / tunnel6.c

/*
 * Copyright (C)2003,2004 USAGI/WIDE Project
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Authors	Mitsuru KANDA  <[email protected]>
 * 		YOSHIFUJI Hideaki <[email protected]>
 */

#include <linux/icmpv6.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/ipv6.h>
#include <net/protocol.h>
#include <net/xfrm.h>

static struct xfrm6_tunnel *tunnel6_handlers;
static struct xfrm6_tunnel *tunnel46_handlers;
static DEFINE_MUTEX(tunnel6_mutex);

int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family)
{
	struct xfrm6_tunnel **pprev;
	int ret = -EEXIST;
	int priority = handler->priority;

	mutex_lock(&tunnel6_mutex);

	for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
	     *pprev; pprev = &(*pprev)->next) {
		if ((*pprev)->priority > priority)
			break;
		if ((*pprev)->priority == priority)
			goto err;
	}

	handler->next = *pprev;
	*pprev = handler;

	ret = 0;

err:
	mutex_unlock(&tunnel6_mutex);

	return ret;
}

EXPORT_SYMBOL(xfrm6_tunnel_register);

int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family)
{
	struct xfrm6_tunnel **pprev;
	int ret = -ENOENT;

	mutex_lock(&tunnel6_mutex);

	for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
	     *pprev; pprev = &(*pprev)->next) {
		if (*pprev == handler) {
			*pprev = handler->next;
			ret = 0;
			break;
		}
	}

	mutex_unlock(&tunnel6_mutex);

	synchronize_net();

	return ret;
}

EXPORT_SYMBOL(xfrm6_tunnel_deregister);

static int tunnel6_rcv(struct sk_buff *skb)
{
	struct xfrm6_tunnel *handler;

	if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
		goto drop;

	for (handler = tunnel6_handlers; handler; handler = handler->next)
		if (!handler->handler(skb))
			return 0;

	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, skb->dev);

drop:
	kfree_skb(skb);
	return 0;
}

static int tunnel46_rcv(struct sk_buff *skb)
{
	struct xfrm6_tunnel *handler;

	if (!pskb_may_pull(skb, sizeof(struct iphdr)))
		goto drop;

	for (handler = tunnel46_handlers; handler; handler = handler->next)
		if (!handler->handler(skb))
			return 0;

	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, skb->dev);

drop:
	kfree_skb(skb);
	return 0;
}

static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
			u8 type, u8 code, int offset, __be32 info)
{
	struct xfrm6_tunnel *handler;

	for (handler = tunnel6_handlers; handler; handler = handler->next)
		if (!handler->err_handler(skb, opt, type, code, offset, info))
			break;
}

static const struct inet6_protocol tunnel6_protocol = {
	.handler	= tunnel6_rcv,
	.err_handler	= tunnel6_err,
	.flags          = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
};

static const struct inet6_protocol tunnel46_protocol = {
	.handler	= tunnel46_rcv,
	.err_handler	= tunnel6_err,
	.flags          = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
};

static int __init tunnel6_init(void)
{
	if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) {
		printk(KERN_ERR "tunnel6 init(): can't add protocol\n");
		return -EAGAIN;
	}
	if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) {
		printk(KERN_ERR "tunnel6 init(): can't add protocol\n");
		inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6);
		return -EAGAIN;
	}
	return 0;
}

static void __exit tunnel6_fini(void)
{
	if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP))
		printk(KERN_ERR "tunnel6 close: can't remove protocol\n");
	if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6))
		printk(KERN_ERR "tunnel6 close: can't remove protocol\n");
}

module_init(tunnel6_init);
module_exit(tunnel6_fini);
MODULE_LICENSE("GPL");
Commit	Line	Data
d2acc347 HX	1	/*
	2	* Copyright (C)2003,2004 USAGI/WIDE Project
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	17	*
	18	* Authors Mitsuru KANDA <[email protected]>
	19	* YOSHIFUJI Hideaki <[email protected]>
	20	*/
	21
50fba2aa	22	#include <linux/icmpv6.h>
d2acc347 HX	23	#include <linux/init.h>
	24	#include <linux/module.h>
	25	#include <linux/mutex.h>
	26	#include <linux/netdevice.h>
	27	#include <linux/skbuff.h>
50fba2aa	28	#include <net/ipv6.h>
d2acc347 HX	29	#include <net/protocol.h>
	30	#include <net/xfrm.h>
	31
	32	static struct xfrm6_tunnel *tunnel6_handlers;
73d605d1	33	static struct xfrm6_tunnel *tunnel46_handlers;
d2acc347 HX	34	static DEFINE_MUTEX(tunnel6_mutex);
d2acc347 HX	35
73d605d1	36	int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family)
d2acc347 HX	37	{
	38	struct xfrm6_tunnel **pprev;
	39	int ret = -EEXIST;
	40	int priority = handler->priority;
	41
	42	mutex_lock(&tunnel6_mutex);
	43
73d605d1 KM	44	for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
73d605d1 KM	45	pprev; pprev = &(pprev)->next) {
d2acc347 HX	46	if ((*pprev)->priority > priority)
	47	break;
	48	if ((*pprev)->priority == priority)
	49	goto err;
	50	}
	51
	52	handler->next = *pprev;
	53	*pprev = handler;
	54
	55	ret = 0;
	56
	57	err:
	58	mutex_unlock(&tunnel6_mutex);
	59
	60	return ret;
	61	}
	62
	63	EXPORT_SYMBOL(xfrm6_tunnel_register);
	64
73d605d1	65	int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family)
d2acc347 HX	66	{
	67	struct xfrm6_tunnel **pprev;
	68	int ret = -ENOENT;
	69
	70	mutex_lock(&tunnel6_mutex);
	71
73d605d1 KM	72	for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
73d605d1 KM	73	pprev; pprev = &(pprev)->next) {
d2acc347 HX	74	if (*pprev == handler) {
	75	*pprev = handler->next;
	76	ret = 0;
	77	break;
	78	}
	79	}
	80
	81	mutex_unlock(&tunnel6_mutex);
	82
	83	synchronize_net();
	84
	85	return ret;
	86	}
	87
	88	EXPORT_SYMBOL(xfrm6_tunnel_deregister);
	89
e5bbef20	90	static int tunnel6_rcv(struct sk_buff *skb)
d2acc347	91	{
d2acc347 HX	92	struct xfrm6_tunnel *handler;
d2acc347 HX	93
50fba2aa HX	94	if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
	95	goto drop;
	96
d2acc347 HX	97	for (handler = tunnel6_handlers; handler; handler = handler->next)
	98	if (!handler->handler(skb))
	99	return 0;
	100
50fba2aa HX	101	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, skb->dev);
	102
	103	drop:
d2acc347 HX	104	kfree_skb(skb);
	105	return 0;
	106	}
	107
e5bbef20	108	static int tunnel46_rcv(struct sk_buff *skb)
73d605d1	109	{
73d605d1 KM	110	struct xfrm6_tunnel *handler;
73d605d1 KM	111
82836372	112	if (!pskb_may_pull(skb, sizeof(struct iphdr)))
73d605d1 KM	113	goto drop;
	114
	115	for (handler = tunnel46_handlers; handler; handler = handler->next)
	116	if (!handler->handler(skb))
	117	return 0;
	118
	119	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, skb->dev);
	120
	121	drop:
	122	kfree_skb(skb);
	123	return 0;
	124	}
	125
d2acc347	126	static void tunnel6_err(struct sk_buff skb, struct inet6_skb_parm opt,
d5fdd6ba	127	u8 type, u8 code, int offset, __be32 info)
d2acc347 HX	128	{
	129	struct xfrm6_tunnel *handler;
	130
	131	for (handler = tunnel6_handlers; handler; handler = handler->next)
	132	if (!handler->err_handler(skb, opt, type, code, offset, info))
	133	break;
	134	}
	135
41135cc8	136	static const struct inet6_protocol tunnel6_protocol = {
d2acc347 HX	137	.handler = tunnel6_rcv,
	138	.err_handler = tunnel6_err,
	139	.flags = INET6_PROTO_NOPOLICY\|INET6_PROTO_FINAL,
	140	};
	141
41135cc8	142	static const struct inet6_protocol tunnel46_protocol = {
73d605d1 KM	143	.handler = tunnel46_rcv,
	144	.err_handler = tunnel6_err,
	145	.flags = INET6_PROTO_NOPOLICY\|INET6_PROTO_FINAL,
	146	};
	147
d2acc347 HX	148	static int __init tunnel6_init(void)
	149	{
	150	if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) {
	151	printk(KERN_ERR "tunnel6 init(): can't add protocol\n");
	152	return -EAGAIN;
	153	}
73d605d1 KM	154	if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) {
	155	printk(KERN_ERR "tunnel6 init(): can't add protocol\n");
	156	inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6);
	157	return -EAGAIN;
	158	}
d2acc347 HX	159	return 0;
	160	}
	161
	162	static void __exit tunnel6_fini(void)
	163	{
73d605d1 KM	164	if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP))
73d605d1 KM	165	printk(KERN_ERR "tunnel6 close: can't remove protocol\n");
d2acc347 HX	166	if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6))
	167	printk(KERN_ERR "tunnel6 close: can't remove protocol\n");
	168	}
	169
	170	module_init(tunnel6_init);
	171	module_exit(tunnel6_fini);
	172	MODULE_LICENSE("GPL");