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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, see <http://www.gnu.org/licenses/>.
16 *
17 * Authors Mitsuru KANDA <mk@linux-ipv6.org>
18 * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
19 */
20
21#define pr_fmt(fmt) "IPv6: " fmt
22
23#include <linux/icmpv6.h>
24#include <linux/init.h>
25#include <linux/module.h>
26#include <linux/mutex.h>
27#include <linux/netdevice.h>
28#include <linux/skbuff.h>
29#include <linux/slab.h>
30#include <net/ipv6.h>
31#include <net/protocol.h>
32#include <net/xfrm.h>
33
34static struct xfrm6_tunnel __rcu *tunnel6_handlers __read_mostly;
35static struct xfrm6_tunnel __rcu *tunnel46_handlers __read_mostly;
36static DEFINE_MUTEX(tunnel6_mutex);
37
38int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family)
39{
40 struct xfrm6_tunnel __rcu **pprev;
41 struct xfrm6_tunnel *t;
42 int ret = -EEXIST;
43 int priority = handler->priority;
44
45 mutex_lock(&tunnel6_mutex);
46
47 for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
48 (t = rcu_dereference_protected(*pprev,
49 lockdep_is_held(&tunnel6_mutex))) != NULL;
50 pprev = &t->next) {
51 if (t->priority > priority)
52 break;
53 if (t->priority == priority)
54 goto err;
55 }
56
57 handler->next = *pprev;
58 rcu_assign_pointer(*pprev, handler);
59
60 ret = 0;
61
62err:
63 mutex_unlock(&tunnel6_mutex);
64
65 return ret;
66}
67EXPORT_SYMBOL(xfrm6_tunnel_register);
68
69int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family)
70{
71 struct xfrm6_tunnel __rcu **pprev;
72 struct xfrm6_tunnel *t;
73 int ret = -ENOENT;
74
75 mutex_lock(&tunnel6_mutex);
76
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;
85 }
86 }
87
88 mutex_unlock(&tunnel6_mutex);
89
90 synchronize_net();
91
92 return ret;
93}
94EXPORT_SYMBOL(xfrm6_tunnel_deregister);
95
96#define for_each_tunnel_rcu(head, handler) \
97 for (handler = rcu_dereference(head); \
98 handler != NULL; \
99 handler = rcu_dereference(handler->next)) \
100
101static int tunnel6_rcv(struct sk_buff *skb)
102{
103 struct xfrm6_tunnel *handler;
104
105 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
106 goto drop;
107
108 for_each_tunnel_rcu(tunnel6_handlers, handler)
109 if (!handler->handler(skb))
110 return 0;
111
112 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
113
114drop:
115 kfree_skb(skb);
116 return 0;
117}
118
119static int tunnel46_rcv(struct sk_buff *skb)
120{
121 struct xfrm6_tunnel *handler;
122
123 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
124 goto drop;
125
126 for_each_tunnel_rcu(tunnel46_handlers, handler)
127 if (!handler->handler(skb))
128 return 0;
129
130 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
131
132drop:
133 kfree_skb(skb);
134 return 0;
135}
136
137static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
138 u8 type, u8 code, int offset, __be32 info)
139{
140 struct xfrm6_tunnel *handler;
141
142 for_each_tunnel_rcu(tunnel6_handlers, handler)
143 if (!handler->err_handler(skb, opt, type, code, offset, info))
144 break;
145}
146
147static void tunnel46_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
148 u8 type, u8 code, int offset, __be32 info)
149{
150 struct xfrm6_tunnel *handler;
151
152 for_each_tunnel_rcu(tunnel46_handlers, handler)
153 if (!handler->err_handler(skb, opt, type, code, offset, info))
154 break;
155}
156
157static const struct inet6_protocol tunnel6_protocol = {
158 .handler = tunnel6_rcv,
159 .err_handler = tunnel6_err,
160 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
161};
162
163static const struct inet6_protocol tunnel46_protocol = {
164 .handler = tunnel46_rcv,
165 .err_handler = tunnel46_err,
166 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
167};
168
169static int __init tunnel6_init(void)
170{
171 if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) {
172 pr_err("%s: can't add protocol\n", __func__);
173 return -EAGAIN;
174 }
175 if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) {
176 pr_err("%s: can't add protocol\n", __func__);
177 inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6);
178 return -EAGAIN;
179 }
180 return 0;
181}
182
183static void __exit tunnel6_fini(void)
184{
185 if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP))
186 pr_err("%s: can't remove protocol\n", __func__);
187 if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6))
188 pr_err("%s: can't remove protocol\n", __func__);
189}
190
191module_init(tunnel6_init);
192module_exit(tunnel6_fini);
193MODULE_LICENSE("GPL");
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 <linux/slab.h>
29#include <net/ipv6.h>
30#include <net/protocol.h>
31#include <net/xfrm.h>
32
33static struct xfrm6_tunnel __rcu *tunnel6_handlers __read_mostly;
34static struct xfrm6_tunnel __rcu *tunnel46_handlers __read_mostly;
35static DEFINE_MUTEX(tunnel6_mutex);
36
37int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family)
38{
39 struct xfrm6_tunnel __rcu **pprev;
40 struct xfrm6_tunnel *t;
41 int ret = -EEXIST;
42 int priority = handler->priority;
43
44 mutex_lock(&tunnel6_mutex);
45
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;
54 }
55
56 handler->next = *pprev;
57 rcu_assign_pointer(*pprev, handler);
58
59 ret = 0;
60
61err:
62 mutex_unlock(&tunnel6_mutex);
63
64 return ret;
65}
66
67EXPORT_SYMBOL(xfrm6_tunnel_register);
68
69int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family)
70{
71 struct xfrm6_tunnel __rcu **pprev;
72 struct xfrm6_tunnel *t;
73 int ret = -ENOENT;
74
75 mutex_lock(&tunnel6_mutex);
76
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;
85 }
86 }
87
88 mutex_unlock(&tunnel6_mutex);
89
90 synchronize_net();
91
92 return ret;
93}
94
95EXPORT_SYMBOL(xfrm6_tunnel_deregister);
96
97#define for_each_tunnel_rcu(head, handler) \
98 for (handler = rcu_dereference(head); \
99 handler != NULL; \
100 handler = rcu_dereference(handler->next)) \
101
102static int tunnel6_rcv(struct sk_buff *skb)
103{
104 struct xfrm6_tunnel *handler;
105
106 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
107 goto drop;
108
109 for_each_tunnel_rcu(tunnel6_handlers, handler)
110 if (!handler->handler(skb))
111 return 0;
112
113 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
114
115drop:
116 kfree_skb(skb);
117 return 0;
118}
119
120static int tunnel46_rcv(struct sk_buff *skb)
121{
122 struct xfrm6_tunnel *handler;
123
124 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
125 goto drop;
126
127 for_each_tunnel_rcu(tunnel46_handlers, handler)
128 if (!handler->handler(skb))
129 return 0;
130
131 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
132
133drop:
134 kfree_skb(skb);
135 return 0;
136}
137
138static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
139 u8 type, u8 code, int offset, __be32 info)
140{
141 struct xfrm6_tunnel *handler;
142
143 for_each_tunnel_rcu(tunnel6_handlers, handler)
144 if (!handler->err_handler(skb, opt, type, code, offset, info))
145 break;
146}
147
148static const struct inet6_protocol tunnel6_protocol = {
149 .handler = tunnel6_rcv,
150 .err_handler = tunnel6_err,
151 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
152};
153
154static const struct inet6_protocol tunnel46_protocol = {
155 .handler = tunnel46_rcv,
156 .err_handler = tunnel6_err,
157 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
158};
159
160static int __init tunnel6_init(void)
161{
162 if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) {
163 printk(KERN_ERR "tunnel6 init(): can't add protocol\n");
164 return -EAGAIN;
165 }
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;
170 }
171 return 0;
172}
173
174static void __exit tunnel6_fini(void)
175{
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");
180}
181
182module_init(tunnel6_init);
183module_exit(tunnel6_fini);
184MODULE_LICENSE("GPL");