2 * Copyright (C)2003,2004 USAGI/WIDE Project
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.
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.
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
18 * Authors Mitsuru KANDA <mk@linux-ipv6.org>
19 * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
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 <linux/slab.h>
30 #include <net/protocol.h>
33 static struct xfrm6_tunnel *tunnel6_handlers __read_mostly;
34 static struct xfrm6_tunnel *tunnel46_handlers __read_mostly;
35 static DEFINE_MUTEX(tunnel6_mutex);
37 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family)
39 struct xfrm6_tunnel **pprev;
41 int priority = handler->priority;
43 mutex_lock(&tunnel6_mutex);
45 for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
46 *pprev; pprev = &(*pprev)->next) {
47 if ((*pprev)->priority > priority)
49 if ((*pprev)->priority == priority)
53 handler->next = *pprev;
59 mutex_unlock(&tunnel6_mutex);
64 EXPORT_SYMBOL(xfrm6_tunnel_register);
66 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family)
68 struct xfrm6_tunnel **pprev;
71 mutex_lock(&tunnel6_mutex);
73 for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
74 *pprev; pprev = &(*pprev)->next) {
75 if (*pprev == handler) {
76 *pprev = handler->next;
82 mutex_unlock(&tunnel6_mutex);
89 EXPORT_SYMBOL(xfrm6_tunnel_deregister);
91 #define for_each_tunnel_rcu(head, handler) \
92 for (handler = rcu_dereference(head); \
94 handler = rcu_dereference(handler->next)) \
96 static int tunnel6_rcv(struct sk_buff *skb)
98 struct xfrm6_tunnel *handler;
100 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
103 for_each_tunnel_rcu(tunnel6_handlers, handler)
104 if (!handler->handler(skb))
107 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
114 static int tunnel46_rcv(struct sk_buff *skb)
116 struct xfrm6_tunnel *handler;
118 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
121 for_each_tunnel_rcu(tunnel46_handlers, handler)
122 if (!handler->handler(skb))
125 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
132 static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
133 u8 type, u8 code, int offset, __be32 info)
135 struct xfrm6_tunnel *handler;
137 for_each_tunnel_rcu(tunnel6_handlers, handler)
138 if (!handler->err_handler(skb, opt, type, code, offset, info))
142 static const struct inet6_protocol tunnel6_protocol = {
143 .handler = tunnel6_rcv,
144 .err_handler = tunnel6_err,
145 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
148 static const struct inet6_protocol tunnel46_protocol = {
149 .handler = tunnel46_rcv,
150 .err_handler = tunnel6_err,
151 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
154 static int __init tunnel6_init(void)
156 if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) {
157 printk(KERN_ERR "tunnel6 init(): can't add protocol\n");
160 if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) {
161 printk(KERN_ERR "tunnel6 init(): can't add protocol\n");
162 inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6);
168 static void __exit tunnel6_fini(void)
170 if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP))
171 printk(KERN_ERR "tunnel6 close: can't remove protocol\n");
172 if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6))
173 printk(KERN_ERR "tunnel6 close: can't remove protocol\n");
176 module_init(tunnel6_init);
177 module_exit(tunnel6_fini);
178 MODULE_LICENSE("GPL");