blob: 23e2809878ae87a82e527415b399d80b493103d8 [file] [log] [blame]
Herbert Xud2acc342006-03-28 01:12:13 -08001/*
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
Herbert Xu50fba2a2006-04-04 13:50:45 -070022#include <linux/icmpv6.h>
Herbert Xud2acc342006-03-28 01:12:13 -080023#include <linux/init.h>
24#include <linux/module.h>
25#include <linux/mutex.h>
26#include <linux/netdevice.h>
27#include <linux/skbuff.h>
Herbert Xu50fba2a2006-04-04 13:50:45 -070028#include <net/ipv6.h>
Herbert Xud2acc342006-03-28 01:12:13 -080029#include <net/protocol.h>
30#include <net/xfrm.h>
31
32static struct xfrm6_tunnel *tunnel6_handlers;
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -080033static struct xfrm6_tunnel *tunnel46_handlers;
Herbert Xud2acc342006-03-28 01:12:13 -080034static DEFINE_MUTEX(tunnel6_mutex);
35
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -080036int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family)
Herbert Xud2acc342006-03-28 01:12:13 -080037{
38 struct xfrm6_tunnel **pprev;
39 int ret = -EEXIST;
40 int priority = handler->priority;
41
42 mutex_lock(&tunnel6_mutex);
43
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -080044 for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
45 *pprev; pprev = &(*pprev)->next) {
Herbert Xud2acc342006-03-28 01:12:13 -080046 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
57err:
58 mutex_unlock(&tunnel6_mutex);
59
60 return ret;
61}
62
63EXPORT_SYMBOL(xfrm6_tunnel_register);
64
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -080065int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family)
Herbert Xud2acc342006-03-28 01:12:13 -080066{
67 struct xfrm6_tunnel **pprev;
68 int ret = -ENOENT;
69
70 mutex_lock(&tunnel6_mutex);
71
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -080072 for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
73 *pprev; pprev = &(*pprev)->next) {
Herbert Xud2acc342006-03-28 01:12:13 -080074 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
88EXPORT_SYMBOL(xfrm6_tunnel_deregister);
89
90static int tunnel6_rcv(struct sk_buff **pskb)
91{
92 struct sk_buff *skb = *pskb;
93 struct xfrm6_tunnel *handler;
94
Herbert Xu50fba2a2006-04-04 13:50:45 -070095 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
96 goto drop;
97
Herbert Xud2acc342006-03-28 01:12:13 -080098 for (handler = tunnel6_handlers; handler; handler = handler->next)
99 if (!handler->handler(skb))
100 return 0;
101
Herbert Xu50fba2a2006-04-04 13:50:45 -0700102 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, skb->dev);
103
104drop:
Herbert Xud2acc342006-03-28 01:12:13 -0800105 kfree_skb(skb);
106 return 0;
107}
108
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -0800109static int tunnel46_rcv(struct sk_buff **pskb)
110{
111 struct sk_buff *skb = *pskb;
112 struct xfrm6_tunnel *handler;
113
114 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
115 goto drop;
116
117 for (handler = tunnel46_handlers; handler; handler = handler->next)
118 if (!handler->handler(skb))
119 return 0;
120
121 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, skb->dev);
122
123drop:
124 kfree_skb(skb);
125 return 0;
126}
127
Herbert Xud2acc342006-03-28 01:12:13 -0800128static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Al Viro04ce6902006-11-08 00:21:01 -0800129 int type, int code, int offset, __be32 info)
Herbert Xud2acc342006-03-28 01:12:13 -0800130{
131 struct xfrm6_tunnel *handler;
132
133 for (handler = tunnel6_handlers; handler; handler = handler->next)
134 if (!handler->err_handler(skb, opt, type, code, offset, info))
135 break;
136}
137
138static struct inet6_protocol tunnel6_protocol = {
139 .handler = tunnel6_rcv,
140 .err_handler = tunnel6_err,
141 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
142};
143
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -0800144static struct inet6_protocol tunnel46_protocol = {
145 .handler = tunnel46_rcv,
146 .err_handler = tunnel6_err,
147 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
148};
149
Herbert Xud2acc342006-03-28 01:12:13 -0800150static int __init tunnel6_init(void)
151{
152 if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) {
153 printk(KERN_ERR "tunnel6 init(): can't add protocol\n");
154 return -EAGAIN;
155 }
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -0800156 if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) {
157 printk(KERN_ERR "tunnel6 init(): can't add protocol\n");
158 inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6);
159 return -EAGAIN;
160 }
Herbert Xud2acc342006-03-28 01:12:13 -0800161 return 0;
162}
163
164static void __exit tunnel6_fini(void)
165{
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -0800166 if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP))
167 printk(KERN_ERR "tunnel6 close: can't remove protocol\n");
Herbert Xud2acc342006-03-28 01:12:13 -0800168 if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6))
169 printk(KERN_ERR "tunnel6 close: can't remove protocol\n");
170}
171
172module_init(tunnel6_init);
173module_exit(tunnel6_fini);
174MODULE_LICENSE("GPL");