[deliverable/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  <mk@linux-ipv6.org>
 * 		YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
 */

#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 <linux/slab.h>
#include <net/ipv6.h>
#include <net/protocol.h>
#include <net/xfrm.h>

static struct xfrm6_tunnel *tunnel6_handlers __read_mostly;
static struct xfrm6_tunnel *tunnel46_handlers __read_mostly;
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;
	rcu_assign_pointer(*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);

#define for_each_tunnel_rcu(head, handler)		\
	for (handler = rcu_dereference(head);		\
	     handler != NULL;				\
	     handler = rcu_dereference(handler->next))	\

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

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

	for_each_tunnel_rcu(tunnel6_handlers, handler)
		if (!handler->handler(skb))
			return 0;

	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);

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_each_tunnel_rcu(tunnel46_handlers, handler)
		if (!handler->handler(skb))
			return 0;

	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);

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_each_tunnel_rcu(tunnel6_handlers, handler)
		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 <mk@linux-ipv6.org>
	19	* YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
	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>
5a0e3ad6	28	#include <linux/slab.h>
50fba2aa	29	#include <net/ipv6.h>
d2acc347 HX	30	#include <net/protocol.h>
	31	#include <net/xfrm.h>
	32
3ff2cfa5 ED	33	static struct xfrm6_tunnel *tunnel6_handlers __read_mostly;
3ff2cfa5 ED	34	static struct xfrm6_tunnel *tunnel46_handlers __read_mostly;
d2acc347 HX	35	static DEFINE_MUTEX(tunnel6_mutex);
d2acc347 HX	36
73d605d1	37	int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family)
d2acc347 HX	38	{
	39	struct xfrm6_tunnel **pprev;
	40	int ret = -EEXIST;
	41	int priority = handler->priority;
	42
	43	mutex_lock(&tunnel6_mutex);
	44
73d605d1 KM	45	for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
73d605d1 KM	46	pprev; pprev = &(pprev)->next) {
d2acc347 HX	47	if ((*pprev)->priority > priority)
	48	break;
	49	if ((*pprev)->priority == priority)
	50	goto err;
	51	}
	52
	53	handler->next = *pprev;
49d61e23	54	rcu_assign_pointer(*pprev, handler);
d2acc347 HX	55
	56	ret = 0;
	57
	58	err:
	59	mutex_unlock(&tunnel6_mutex);
	60
	61	return ret;
	62	}
	63
	64	EXPORT_SYMBOL(xfrm6_tunnel_register);
	65
73d605d1	66	int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family)
d2acc347 HX	67	{
	68	struct xfrm6_tunnel **pprev;
	69	int ret = -ENOENT;
	70
	71	mutex_lock(&tunnel6_mutex);
	72
73d605d1 KM	73	for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
73d605d1 KM	74	pprev; pprev = &(pprev)->next) {
d2acc347 HX	75	if (*pprev == handler) {
	76	*pprev = handler->next;
	77	ret = 0;
	78	break;
	79	}
	80	}
	81
	82	mutex_unlock(&tunnel6_mutex);
	83
	84	synchronize_net();
	85
	86	return ret;
	87	}
	88
	89	EXPORT_SYMBOL(xfrm6_tunnel_deregister);
	90
875168a9 ED	91	#define for_each_tunnel_rcu(head, handler) \
	92	for (handler = rcu_dereference(head); \
	93	handler != NULL; \
	94	handler = rcu_dereference(handler->next)) \
	95
e5bbef20	96	static int tunnel6_rcv(struct sk_buff *skb)
d2acc347	97	{
d2acc347 HX	98	struct xfrm6_tunnel *handler;
d2acc347 HX	99
50fba2aa HX	100	if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
	101	goto drop;
	102
875168a9	103	for_each_tunnel_rcu(tunnel6_handlers, handler)
d2acc347 HX	104	if (!handler->handler(skb))
	105	return 0;
	106
3ffe533c	107	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
50fba2aa HX	108
50fba2aa HX	109	drop:
d2acc347 HX	110	kfree_skb(skb);
	111	return 0;
	112	}
	113
e5bbef20	114	static int tunnel46_rcv(struct sk_buff *skb)
73d605d1	115	{
73d605d1 KM	116	struct xfrm6_tunnel *handler;
73d605d1 KM	117
82836372	118	if (!pskb_may_pull(skb, sizeof(struct iphdr)))
73d605d1 KM	119	goto drop;
73d605d1 KM	120
875168a9	121	for_each_tunnel_rcu(tunnel46_handlers, handler)
73d605d1 KM	122	if (!handler->handler(skb))
	123	return 0;
	124
3ffe533c	125	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
73d605d1 KM	126
	127	drop:
	128	kfree_skb(skb);
	129	return 0;
	130	}
	131
d2acc347	132	static void tunnel6_err(struct sk_buff skb, struct inet6_skb_parm opt,
d5fdd6ba	133	u8 type, u8 code, int offset, __be32 info)
d2acc347 HX	134	{
	135	struct xfrm6_tunnel *handler;
	136
875168a9	137	for_each_tunnel_rcu(tunnel6_handlers, handler)
d2acc347 HX	138	if (!handler->err_handler(skb, opt, type, code, offset, info))
	139	break;
	140	}
	141
41135cc8	142	static const struct inet6_protocol tunnel6_protocol = {
d2acc347 HX	143	.handler = tunnel6_rcv,
	144	.err_handler = tunnel6_err,
	145	.flags = INET6_PROTO_NOPOLICY\|INET6_PROTO_FINAL,
	146	};
	147
41135cc8	148	static const struct inet6_protocol tunnel46_protocol = {
73d605d1 KM	149	.handler = tunnel46_rcv,
	150	.err_handler = tunnel6_err,
	151	.flags = INET6_PROTO_NOPOLICY\|INET6_PROTO_FINAL,
	152	};
	153
d2acc347 HX	154	static int __init tunnel6_init(void)
	155	{
	156	if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) {
	157	printk(KERN_ERR "tunnel6 init(): can't add protocol\n");
	158	return -EAGAIN;
	159	}
73d605d1 KM	160	if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) {
	161	printk(KERN_ERR "tunnel6 init(): can't add protocol\n");
	162	inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6);
	163	return -EAGAIN;
	164	}
d2acc347 HX	165	return 0;
	166	}
	167
	168	static void __exit tunnel6_fini(void)
	169	{
73d605d1 KM	170	if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP))
73d605d1 KM	171	printk(KERN_ERR "tunnel6 close: can't remove protocol\n");
d2acc347 HX	172	if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6))
	173	printk(KERN_ERR "tunnel6 close: can't remove protocol\n");
	174	}
	175
	176	module_init(tunnel6_init);
	177	module_exit(tunnel6_fini);
	178	MODULE_LICENSE("GPL");