[GitHub/mt8127/android_kernel_alcatel_ttab.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>
 */

#define pr_fmt(fmt) "IPv6: " fmt

#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 __rcu *tunnel6_handlers __read_mostly;
static struct xfrm6_tunnel __rcu *tunnel46_handlers __read_mostly;
static DEFINE_MUTEX(tunnel6_mutex);

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

	mutex_lock(&tunnel6_mutex);

	for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
	     (t = rcu_dereference_protected(*pprev,
			lockdep_is_held(&tunnel6_mutex))) != NULL;
	     pprev = &t->next) {
		if (t->priority > priority)
			break;
		if (t->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 __rcu **pprev;
	struct xfrm6_tunnel *t;
	int ret = -ENOENT;

	mutex_lock(&tunnel6_mutex);

	for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
	     (t = rcu_dereference_protected(*pprev,
			lockdep_is_held(&tunnel6_mutex))) != NULL;
	     pprev = &t->next) {
		if (t == 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)) {
		pr_err("%s: can't add protocol\n", __func__);
		return -EAGAIN;
	}
	if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) {
		pr_err("%s: can't add protocol\n", __func__);
		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))
		pr_err("%s: can't remove protocol\n", __func__);
	if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6))
		pr_err("%s: can't remove protocol\n", __func__);
}

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
f3213831 JP	22	#define pr_fmt(fmt) "IPv6: " fmt
f3213831 JP	23
50fba2aa	24	#include <linux/icmpv6.h>
d2acc347 HX	25	#include <linux/init.h>
	26	#include <linux/module.h>
	27	#include <linux/mutex.h>
	28	#include <linux/netdevice.h>
	29	#include <linux/skbuff.h>
5a0e3ad6	30	#include <linux/slab.h>
50fba2aa	31	#include <net/ipv6.h>
d2acc347 HX	32	#include <net/protocol.h>
	33	#include <net/xfrm.h>
	34
6f0bcf15 ED	35	static struct xfrm6_tunnel __rcu *tunnel6_handlers __read_mostly;
6f0bcf15 ED	36	static struct xfrm6_tunnel __rcu *tunnel46_handlers __read_mostly;
d2acc347 HX	37	static DEFINE_MUTEX(tunnel6_mutex);
d2acc347 HX	38
73d605d1	39	int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family)
d2acc347	40	{
6f0bcf15 ED	41	struct xfrm6_tunnel __rcu **pprev;
6f0bcf15 ED	42	struct xfrm6_tunnel *t;
d2acc347 HX	43	int ret = -EEXIST;
	44	int priority = handler->priority;
	45
	46	mutex_lock(&tunnel6_mutex);
	47
73d605d1	48	for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
6f0bcf15 ED	49	(t = rcu_dereference_protected(*pprev,
	50	lockdep_is_held(&tunnel6_mutex))) != NULL;
	51	pprev = &t->next) {
	52	if (t->priority > priority)
d2acc347	53	break;
6f0bcf15	54	if (t->priority == priority)
d2acc347 HX	55	goto err;
	56	}
	57
	58	handler->next = *pprev;
49d61e23	59	rcu_assign_pointer(*pprev, handler);
d2acc347 HX	60
	61	ret = 0;
	62
	63	err:
	64	mutex_unlock(&tunnel6_mutex);
	65
	66	return ret;
	67	}
	68
	69	EXPORT_SYMBOL(xfrm6_tunnel_register);
	70
73d605d1	71	int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family)
d2acc347	72	{
6f0bcf15 ED	73	struct xfrm6_tunnel __rcu **pprev;
6f0bcf15 ED	74	struct xfrm6_tunnel *t;
d2acc347 HX	75	int ret = -ENOENT;
	76
	77	mutex_lock(&tunnel6_mutex);
	78
73d605d1	79	for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
6f0bcf15 ED	80	(t = rcu_dereference_protected(*pprev,
	81	lockdep_is_held(&tunnel6_mutex))) != NULL;
	82	pprev = &t->next) {
	83	if (t == handler) {
d2acc347 HX	84	*pprev = handler->next;
	85	ret = 0;
	86	break;
	87	}
	88	}
	89
	90	mutex_unlock(&tunnel6_mutex);
	91
	92	synchronize_net();
	93
	94	return ret;
	95	}
	96
	97	EXPORT_SYMBOL(xfrm6_tunnel_deregister);
	98
875168a9 ED	99	#define for_each_tunnel_rcu(head, handler) \
	100	for (handler = rcu_dereference(head); \
	101	handler != NULL; \
	102	handler = rcu_dereference(handler->next)) \
	103
e5bbef20	104	static int tunnel6_rcv(struct sk_buff *skb)
d2acc347	105	{
d2acc347 HX	106	struct xfrm6_tunnel *handler;
d2acc347 HX	107
50fba2aa HX	108	if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
	109	goto drop;
	110
875168a9	111	for_each_tunnel_rcu(tunnel6_handlers, handler)
d2acc347 HX	112	if (!handler->handler(skb))
	113	return 0;
	114
3ffe533c	115	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
50fba2aa HX	116
50fba2aa HX	117	drop:
d2acc347 HX	118	kfree_skb(skb);
	119	return 0;
	120	}
	121
e5bbef20	122	static int tunnel46_rcv(struct sk_buff *skb)
73d605d1	123	{
73d605d1 KM	124	struct xfrm6_tunnel *handler;
73d605d1 KM	125
82836372	126	if (!pskb_may_pull(skb, sizeof(struct iphdr)))
73d605d1 KM	127	goto drop;
73d605d1 KM	128
875168a9	129	for_each_tunnel_rcu(tunnel46_handlers, handler)
73d605d1 KM	130	if (!handler->handler(skb))
	131	return 0;
	132
3ffe533c	133	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
73d605d1 KM	134
	135	drop:
	136	kfree_skb(skb);
	137	return 0;
	138	}
	139
d2acc347	140	static void tunnel6_err(struct sk_buff skb, struct inet6_skb_parm opt,
d5fdd6ba	141	u8 type, u8 code, int offset, __be32 info)
d2acc347 HX	142	{
	143	struct xfrm6_tunnel *handler;
	144
875168a9	145	for_each_tunnel_rcu(tunnel6_handlers, handler)
d2acc347 HX	146	if (!handler->err_handler(skb, opt, type, code, offset, info))
	147	break;
	148	}
	149
41135cc8	150	static const struct inet6_protocol tunnel6_protocol = {
d2acc347 HX	151	.handler = tunnel6_rcv,
	152	.err_handler = tunnel6_err,
	153	.flags = INET6_PROTO_NOPOLICY\|INET6_PROTO_FINAL,
	154	};
	155
41135cc8	156	static const struct inet6_protocol tunnel46_protocol = {
73d605d1 KM	157	.handler = tunnel46_rcv,
	158	.err_handler = tunnel6_err,
	159	.flags = INET6_PROTO_NOPOLICY\|INET6_PROTO_FINAL,
	160	};
	161
d2acc347 HX	162	static int __init tunnel6_init(void)
	163	{
	164	if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) {
f3213831	165	pr_err("%s: can't add protocol\n", __func__);
d2acc347 HX	166	return -EAGAIN;
d2acc347 HX	167	}
73d605d1	168	if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) {
f3213831	169	pr_err("%s: can't add protocol\n", __func__);
73d605d1 KM	170	inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6);
	171	return -EAGAIN;
	172	}
d2acc347 HX	173	return 0;
	174	}
	175
	176	static void __exit tunnel6_fini(void)
	177	{
73d605d1	178	if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP))
f3213831	179	pr_err("%s: can't remove protocol\n", __func__);
d2acc347	180	if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6))
f3213831	181	pr_err("%s: can't remove protocol\n", __func__);
d2acc347 HX	182	}
	183
	184	module_init(tunnel6_init);
	185	module_exit(tunnel6_fini);
	186	MODULE_LICENSE("GPL");