driver core: remove drivers/base/sys.c and include/linux/sysdev.h
[zen-stable.git] / net / ipv6 / tunnel6.c
blob4f3cec12aa8575a860f18124f0f4ee7f83cf540d
1 /*
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>
29 #include <net/ipv6.h>
30 #include <net/protocol.h>
31 #include <net/xfrm.h>
33 static struct xfrm6_tunnel __rcu *tunnel6_handlers __read_mostly;
34 static struct xfrm6_tunnel __rcu *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 __rcu **pprev;
40 struct xfrm6_tunnel *t;
41 int ret = -EEXIST;
42 int priority = handler->priority;
44 mutex_lock(&tunnel6_mutex);
46 for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
47 (t = rcu_dereference_protected(*pprev,
48 lockdep_is_held(&tunnel6_mutex))) != NULL;
49 pprev = &t->next) {
50 if (t->priority > priority)
51 break;
52 if (t->priority == priority)
53 goto err;
56 handler->next = *pprev;
57 rcu_assign_pointer(*pprev, handler);
59 ret = 0;
61 err:
62 mutex_unlock(&tunnel6_mutex);
64 return ret;
67 EXPORT_SYMBOL(xfrm6_tunnel_register);
69 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family)
71 struct xfrm6_tunnel __rcu **pprev;
72 struct xfrm6_tunnel *t;
73 int ret = -ENOENT;
75 mutex_lock(&tunnel6_mutex);
77 for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
78 (t = rcu_dereference_protected(*pprev,
79 lockdep_is_held(&tunnel6_mutex))) != NULL;
80 pprev = &t->next) {
81 if (t == handler) {
82 *pprev = handler->next;
83 ret = 0;
84 break;
88 mutex_unlock(&tunnel6_mutex);
90 synchronize_net();
92 return ret;
95 EXPORT_SYMBOL(xfrm6_tunnel_deregister);
97 #define for_each_tunnel_rcu(head, handler) \
98 for (handler = rcu_dereference(head); \
99 handler != NULL; \
100 handler = rcu_dereference(handler->next)) \
102 static int tunnel6_rcv(struct sk_buff *skb)
104 struct xfrm6_tunnel *handler;
106 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
107 goto drop;
109 for_each_tunnel_rcu(tunnel6_handlers, handler)
110 if (!handler->handler(skb))
111 return 0;
113 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
115 drop:
116 kfree_skb(skb);
117 return 0;
120 static int tunnel46_rcv(struct sk_buff *skb)
122 struct xfrm6_tunnel *handler;
124 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
125 goto drop;
127 for_each_tunnel_rcu(tunnel46_handlers, handler)
128 if (!handler->handler(skb))
129 return 0;
131 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
133 drop:
134 kfree_skb(skb);
135 return 0;
138 static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
139 u8 type, u8 code, int offset, __be32 info)
141 struct xfrm6_tunnel *handler;
143 for_each_tunnel_rcu(tunnel6_handlers, handler)
144 if (!handler->err_handler(skb, opt, type, code, offset, info))
145 break;
148 static const struct inet6_protocol tunnel6_protocol = {
149 .handler = tunnel6_rcv,
150 .err_handler = tunnel6_err,
151 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
154 static const struct inet6_protocol tunnel46_protocol = {
155 .handler = tunnel46_rcv,
156 .err_handler = tunnel6_err,
157 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
160 static int __init tunnel6_init(void)
162 if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) {
163 printk(KERN_ERR "tunnel6 init(): can't add protocol\n");
164 return -EAGAIN;
166 if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) {
167 printk(KERN_ERR "tunnel6 init(): can't add protocol\n");
168 inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6);
169 return -EAGAIN;
171 return 0;
174 static void __exit tunnel6_fini(void)
176 if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP))
177 printk(KERN_ERR "tunnel6 close: can't remove protocol\n");
178 if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6))
179 printk(KERN_ERR "tunnel6 close: can't remove protocol\n");
182 module_init(tunnel6_init);
183 module_exit(tunnel6_fini);
184 MODULE_LICENSE("GPL");