Release 4.8 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, see <http://www.gnu.org/licenses/>.
 *
 * 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;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
herbert xu
herbert xu
97
70.29%
1
25.00%
eric dumazet
eric dumazet
28
20.29%
2
50.00%
kazunori miyazawa
kazunori miyazawa
13
9.42%
1
25.00%
Total
138
100.00%
4
100.00%


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;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
herbert xu
herbert xu
77
68.14%
1
33.33%
eric dumazet
eric dumazet
23
20.35%
1
33.33%
kazunori miyazawa
kazunori miyazawa
13
11.50%
1
33.33%
Total
113
100.00%
3
100.00%


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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
kazunori miyazawa
kazunori miyazawa
65
89.04%
1
25.00%
eric dumazet
eric dumazet
6
8.22%
1
25.00%
herbert xu
herbert xu
1
1.37%
1
25.00%
colin
colin
1
1.37%
1
25.00%
Total
73
100.00%
4
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
herbert xu
herbert xu
51
85.00%
1
25.00%
eric dumazet
eric dumazet
6
10.00%
1
25.00%
brian haley
brian haley
2
3.33%
1
25.00%
al viro
al viro
1
1.67%
1
25.00%
Total
60
100.00%
4
100.00%



static void tunnel46_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(tunnel46_handlers, handler)
		if (!handler->err_handler(skb, opt, type, code, offset, info))
			break;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
michal kubecek
michal kubecek
60
100.00%
1
100.00%
Total
60
100.00%
1
100.00%


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	= tunnel46_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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
herbert xu
herbert xu
31
46.97%
1
33.33%
kazunori miyazawa
kazunori miyazawa
27
40.91%
1
33.33%
joe perches
joe perches
8
12.12%
1
33.33%
Total
66
100.00%
3
100.00%



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__);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
herbert xu
herbert xu
22
51.16%
1
33.33%
kazunori miyazawa
kazunori miyazawa
13
30.23%
1
33.33%
joe perches
joe perches
8
18.60%
1
33.33%
Total
43
100.00%
3
100.00%


module_init(tunnel6_init);

module_exit(tunnel6_fini);
MODULE_LICENSE("GPL");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
herbert xu
herbert xu
427
56.04%
3
18.75%
kazunori miyazawa
kazunori miyazawa
160
21.00%
1
6.25%
eric dumazet
eric dumazet
81
10.63%
4
25.00%
michal kubecek
michal kubecek
61
8.01%
1
6.25%
joe perches
joe perches
23
3.02%
1
6.25%
tejun heo
tejun heo
3
0.39%
1
6.25%
alexey dobriyan
alexey dobriyan
2
0.26%
1
6.25%
brian haley
brian haley
2
0.26%
1
6.25%
ian morris
ian morris
1
0.13%
1
6.25%
colin
colin
1
0.13%
1
6.25%
al viro
al viro
1
0.13%
1
6.25%
Total
762
100.00%
16
100.00%
  
Directory: net/ipv6

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.