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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
Jeff Kirshera99421d2013-12-06 09:13:39 -080015 * along with this program; if not, see <http://www.gnu.org/licenses/>.
Herbert Xud2acc342006-03-28 01:12:13 -080016 *
17 * Authors Mitsuru KANDA <mk@linux-ipv6.org>
Ian Morris67ba4152014-08-24 21:53:10 +010018 * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Herbert Xud2acc342006-03-28 01:12:13 -080019 */
20
Joe Perchesf3213832012-05-15 14:11:53 +000021#define pr_fmt(fmt) "IPv6: " fmt
22
Herbert Xu50fba2a2006-04-04 13:50:45 -070023#include <linux/icmpv6.h>
Herbert Xud2acc342006-03-28 01:12:13 -080024#include <linux/init.h>
25#include <linux/module.h>
26#include <linux/mutex.h>
27#include <linux/netdevice.h>
28#include <linux/skbuff.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090029#include <linux/slab.h>
Herbert Xu50fba2a2006-04-04 13:50:45 -070030#include <net/ipv6.h>
Herbert Xud2acc342006-03-28 01:12:13 -080031#include <net/protocol.h>
32#include <net/xfrm.h>
33
Eric Dumazet6f0bcf12010-10-24 21:33:16 +000034static struct xfrm6_tunnel __rcu *tunnel6_handlers __read_mostly;
35static struct xfrm6_tunnel __rcu *tunnel46_handlers __read_mostly;
Herbert Xud2acc342006-03-28 01:12:13 -080036static DEFINE_MUTEX(tunnel6_mutex);
37
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -080038int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family)
Herbert Xud2acc342006-03-28 01:12:13 -080039{
Eric Dumazet6f0bcf12010-10-24 21:33:16 +000040 struct xfrm6_tunnel __rcu **pprev;
41 struct xfrm6_tunnel *t;
Herbert Xud2acc342006-03-28 01:12:13 -080042 int ret = -EEXIST;
43 int priority = handler->priority;
44
45 mutex_lock(&tunnel6_mutex);
46
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -080047 for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
Eric Dumazet6f0bcf12010-10-24 21:33:16 +000048 (t = rcu_dereference_protected(*pprev,
49 lockdep_is_held(&tunnel6_mutex))) != NULL;
50 pprev = &t->next) {
51 if (t->priority > priority)
Herbert Xud2acc342006-03-28 01:12:13 -080052 break;
Eric Dumazet6f0bcf12010-10-24 21:33:16 +000053 if (t->priority == priority)
Herbert Xud2acc342006-03-28 01:12:13 -080054 goto err;
55 }
56
57 handler->next = *pprev;
Eric Dumazet49d61e22010-09-09 05:33:43 +000058 rcu_assign_pointer(*pprev, handler);
Herbert Xud2acc342006-03-28 01:12:13 -080059
60 ret = 0;
61
62err:
63 mutex_unlock(&tunnel6_mutex);
64
65 return ret;
66}
Herbert Xud2acc342006-03-28 01:12:13 -080067EXPORT_SYMBOL(xfrm6_tunnel_register);
68
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -080069int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family)
Herbert Xud2acc342006-03-28 01:12:13 -080070{
Eric Dumazet6f0bcf12010-10-24 21:33:16 +000071 struct xfrm6_tunnel __rcu **pprev;
72 struct xfrm6_tunnel *t;
Herbert Xud2acc342006-03-28 01:12:13 -080073 int ret = -ENOENT;
74
75 mutex_lock(&tunnel6_mutex);
76
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -080077 for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
Eric Dumazet6f0bcf12010-10-24 21:33:16 +000078 (t = rcu_dereference_protected(*pprev,
79 lockdep_is_held(&tunnel6_mutex))) != NULL;
80 pprev = &t->next) {
81 if (t == handler) {
Herbert Xud2acc342006-03-28 01:12:13 -080082 *pprev = handler->next;
83 ret = 0;
84 break;
85 }
86 }
87
88 mutex_unlock(&tunnel6_mutex);
89
90 synchronize_net();
91
92 return ret;
93}
Herbert Xud2acc342006-03-28 01:12:13 -080094EXPORT_SYMBOL(xfrm6_tunnel_deregister);
95
Eric Dumazet875168a2010-08-30 11:07:25 +000096#define for_each_tunnel_rcu(head, handler) \
97 for (handler = rcu_dereference(head); \
98 handler != NULL; \
99 handler = rcu_dereference(handler->next)) \
100
Herbert Xue5bbef22007-10-15 12:50:28 -0700101static int tunnel6_rcv(struct sk_buff *skb)
Herbert Xud2acc342006-03-28 01:12:13 -0800102{
Herbert Xud2acc342006-03-28 01:12:13 -0800103 struct xfrm6_tunnel *handler;
104
Herbert Xu50fba2a2006-04-04 13:50:45 -0700105 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
106 goto drop;
107
Eric Dumazet875168a2010-08-30 11:07:25 +0000108 for_each_tunnel_rcu(tunnel6_handlers, handler)
Herbert Xud2acc342006-03-28 01:12:13 -0800109 if (!handler->handler(skb))
110 return 0;
111
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000112 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
Herbert Xu50fba2a2006-04-04 13:50:45 -0700113
114drop:
Herbert Xud2acc342006-03-28 01:12:13 -0800115 kfree_skb(skb);
116 return 0;
117}
118
Herbert Xue5bbef22007-10-15 12:50:28 -0700119static int tunnel46_rcv(struct sk_buff *skb)
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -0800120{
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -0800121 struct xfrm6_tunnel *handler;
122
Colin82836372008-05-27 00:04:43 +0800123 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -0800124 goto drop;
125
Eric Dumazet875168a2010-08-30 11:07:25 +0000126 for_each_tunnel_rcu(tunnel46_handlers, handler)
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -0800127 if (!handler->handler(skb))
128 return 0;
129
Alexey Dobriyan3ffe5332010-02-18 08:25:24 +0000130 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -0800131
132drop:
133 kfree_skb(skb);
134 return 0;
135}
136
Herbert Xud2acc342006-03-28 01:12:13 -0800137static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700138 u8 type, u8 code, int offset, __be32 info)
Herbert Xud2acc342006-03-28 01:12:13 -0800139{
140 struct xfrm6_tunnel *handler;
141
Eric Dumazet875168a2010-08-30 11:07:25 +0000142 for_each_tunnel_rcu(tunnel6_handlers, handler)
Herbert Xud2acc342006-03-28 01:12:13 -0800143 if (!handler->err_handler(skb, opt, type, code, offset, info))
144 break;
145}
146
Alexey Dobriyan41135cc2009-09-14 12:22:28 +0000147static const struct inet6_protocol tunnel6_protocol = {
Herbert Xud2acc342006-03-28 01:12:13 -0800148 .handler = tunnel6_rcv,
149 .err_handler = tunnel6_err,
150 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
151};
152
Alexey Dobriyan41135cc2009-09-14 12:22:28 +0000153static const struct inet6_protocol tunnel46_protocol = {
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -0800154 .handler = tunnel46_rcv,
155 .err_handler = tunnel6_err,
156 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
157};
158
Herbert Xud2acc342006-03-28 01:12:13 -0800159static int __init tunnel6_init(void)
160{
161 if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) {
Joe Perchesf3213832012-05-15 14:11:53 +0000162 pr_err("%s: can't add protocol\n", __func__);
Herbert Xud2acc342006-03-28 01:12:13 -0800163 return -EAGAIN;
164 }
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -0800165 if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) {
Joe Perchesf3213832012-05-15 14:11:53 +0000166 pr_err("%s: can't add protocol\n", __func__);
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -0800167 inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6);
168 return -EAGAIN;
169 }
Herbert Xud2acc342006-03-28 01:12:13 -0800170 return 0;
171}
172
173static void __exit tunnel6_fini(void)
174{
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -0800175 if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP))
Joe Perchesf3213832012-05-15 14:11:53 +0000176 pr_err("%s: can't remove protocol\n", __func__);
Herbert Xud2acc342006-03-28 01:12:13 -0800177 if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6))
Joe Perchesf3213832012-05-15 14:11:53 +0000178 pr_err("%s: can't remove protocol\n", __func__);
Herbert Xud2acc342006-03-28 01:12:13 -0800179}
180
181module_init(tunnel6_init);
182module_exit(tunnel6_fini);
183MODULE_LICENSE("GPL");