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
22 #include <linux/icmpv6.h>
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>
28 #include <net/ipv6.h>
29 #include <net/protocol.h>
30 #include <net/xfrm.h>
31
32 static struct xfrm6_tunnel *tunnel6_handlers;
33 static struct xfrm6_tunnel *tunnel46_handlers;
34 static DEFINE_MUTEX(tunnel6_mutex);
35
36 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family)
37 {
38 struct xfrm6_tunnel **pprev;
39 int ret = -EEXIST;
40 int priority = handler->priority;
41
42 mutex_lock(&tunnel6_mutex);
43
44 for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
45 *pprev; pprev = &(*pprev)->next) {
46 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
57 err:
58 mutex_unlock(&tunnel6_mutex);
59
60 return ret;
61 }
62
63 EXPORT_SYMBOL(xfrm6_tunnel_register);
64
65 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family)
66 {
67 struct xfrm6_tunnel **pprev;
68 int ret = -ENOENT;
69
70 mutex_lock(&tunnel6_mutex);
71
72 for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
73 *pprev; pprev = &(*pprev)->next) {
74 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
88 EXPORT_SYMBOL(xfrm6_tunnel_deregister);
89
90 static int tunnel6_rcv(struct sk_buff *skb)
91 {
92 struct xfrm6_tunnel *handler;
93
94 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
95 goto drop;
96
97 for (handler = tunnel6_handlers; handler; handler = handler->next)
98 if (!handler->handler(skb))
99 return 0;
100
101 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, skb->dev);
102
103 drop:
104 kfree_skb(skb);
105 return 0;
106 }
107
108 static int tunnel46_rcv(struct sk_buff *skb)
109 {
110 struct xfrm6_tunnel *handler;
111
112 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
113 goto drop;
114
115 for (handler = tunnel46_handlers; handler; handler = handler->next)
116 if (!handler->handler(skb))
117 return 0;
118
119 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, skb->dev);
120
121 drop:
122 kfree_skb(skb);
123 return 0;
124 }
125
126 static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
127 int type, int code, int offset, __be32 info)
128 {
129 struct xfrm6_tunnel *handler;
130
131 for (handler = tunnel6_handlers; handler; handler = handler->next)
132 if (!handler->err_handler(skb, opt, type, code, offset, info))
133 break;
134 }
135
136 static struct inet6_protocol tunnel6_protocol = {
137 .handler = tunnel6_rcv,
138 .err_handler = tunnel6_err,
139 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
140 };
141
142 static struct inet6_protocol tunnel46_protocol = {
143 .handler = tunnel46_rcv,
144 .err_handler = tunnel6_err,
145 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
146 };
147
148 static int __init tunnel6_init(void)
149 {
150 if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) {
151 printk(KERN_ERR "tunnel6 init(): can't add protocol\n");
152 return -EAGAIN;
153 }
154 if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) {
155 printk(KERN_ERR "tunnel6 init(): can't add protocol\n");
156 inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6);
157 return -EAGAIN;
158 }
159 return 0;
160 }
161
162 static void __exit tunnel6_fini(void)
163 {
164 if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP))
165 printk(KERN_ERR "tunnel6 close: can't remove protocol\n");
166 if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6))
167 printk(KERN_ERR "tunnel6 close: can't remove protocol\n");
168 }
169
170 module_init(tunnel6_init);
171 module_exit(tunnel6_fini);
172 MODULE_LICENSE("GPL");
173
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