Release 4.11 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;
}
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28
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2
50.00%
Kazunori Miyazawa
13
9.42%
1
25.00%
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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;
}
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Herbert Xu
77
68.14%
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Eric Dumazet
23
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1
33.33%
Kazunori Miyazawa
13
11.50%
1
33.33%
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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;
}

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65
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25.00%
Eric Dumazet
6
8.22%
1
25.00%
Colin
1
1.37%
1
25.00%
Herbert Xu
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;
}

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Eric Dumazet
6
10.00%
1
25.00%
Brian Haley
2
3.33%
1
25.00%
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;
}

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60
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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;
}

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31
46.97%
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Kazunori Miyazawa
27
40.91%
1
33.33%
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__);
}

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51.16%
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33.33%
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30.23%
1
33.33%
Joe Perches
8
18.60%
1
33.33%
Total
43
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3
100.00%


module_init(tunnel6_init);

module_exit(tunnel6_fini);
MODULE_LICENSE("GPL");
Overall Contributors
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CommitProp
Herbert Xu
427
56.04%
3
18.75%
Kazunori Miyazawa
160
21.00%
1
6.25%
Eric Dumazet
81
10.63%
4
25.00%
Michal Kubeček
61
8.01%
1
6.25%
Joe Perches
23
3.02%
1
6.25%
Tejun Heo
3
0.39%
1
6.25%
Brian Haley
2
0.26%
1
6.25%
Alexey Dobriyan
2
0.26%
1
6.25%
Colin
1
0.13%
1
6.25%
Ian Morris
1
0.13%
1
6.25%
Al Viro
1
0.13%
1
6.25%
Total
762
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16
100.00%
Directory: net/ipv6

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