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d2acc347 HX |
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 | ||
50fba2aa | 22 | #include <linux/icmpv6.h> |
d2acc347 HX |
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> | |
50fba2aa | 28 | #include <net/ipv6.h> |
d2acc347 HX |
29 | #include <net/protocol.h> |
30 | #include <net/xfrm.h> | |
31 | ||
32 | static struct xfrm6_tunnel *tunnel6_handlers; | |
73d605d1 | 33 | static struct xfrm6_tunnel *tunnel46_handlers; |
d2acc347 HX |
34 | static DEFINE_MUTEX(tunnel6_mutex); |
35 | ||
73d605d1 | 36 | int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family) |
d2acc347 HX |
37 | { |
38 | struct xfrm6_tunnel **pprev; | |
39 | int ret = -EEXIST; | |
40 | int priority = handler->priority; | |
41 | ||
42 | mutex_lock(&tunnel6_mutex); | |
43 | ||
73d605d1 KM |
44 | for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers; |
45 | *pprev; pprev = &(*pprev)->next) { | |
d2acc347 HX |
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 | ||
73d605d1 | 65 | int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family) |
d2acc347 HX |
66 | { |
67 | struct xfrm6_tunnel **pprev; | |
68 | int ret = -ENOENT; | |
69 | ||
70 | mutex_lock(&tunnel6_mutex); | |
71 | ||
73d605d1 KM |
72 | for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers; |
73 | *pprev; pprev = &(*pprev)->next) { | |
d2acc347 HX |
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 **pskb) | |
91 | { | |
92 | struct sk_buff *skb = *pskb; | |
93 | struct xfrm6_tunnel *handler; | |
94 | ||
50fba2aa HX |
95 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
96 | goto drop; | |
97 | ||
d2acc347 HX |
98 | for (handler = tunnel6_handlers; handler; handler = handler->next) |
99 | if (!handler->handler(skb)) | |
100 | return 0; | |
101 | ||
50fba2aa HX |
102 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, skb->dev); |
103 | ||
104 | drop: | |
d2acc347 HX |
105 | kfree_skb(skb); |
106 | return 0; | |
107 | } | |
108 | ||
73d605d1 KM |
109 | static int tunnel46_rcv(struct sk_buff **pskb) |
110 | { | |
111 | struct sk_buff *skb = *pskb; | |
112 | struct xfrm6_tunnel *handler; | |
113 | ||
114 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
115 | goto drop; | |
116 | ||
117 | for (handler = tunnel46_handlers; handler; handler = handler->next) | |
118 | if (!handler->handler(skb)) | |
119 | return 0; | |
120 | ||
121 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, skb->dev); | |
122 | ||
123 | drop: | |
124 | kfree_skb(skb); | |
125 | return 0; | |
126 | } | |
127 | ||
d2acc347 | 128 | static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
04ce6909 | 129 | int type, int code, int offset, __be32 info) |
d2acc347 HX |
130 | { |
131 | struct xfrm6_tunnel *handler; | |
132 | ||
133 | for (handler = tunnel6_handlers; handler; handler = handler->next) | |
134 | if (!handler->err_handler(skb, opt, type, code, offset, info)) | |
135 | break; | |
136 | } | |
137 | ||
138 | static struct inet6_protocol tunnel6_protocol = { | |
139 | .handler = tunnel6_rcv, | |
140 | .err_handler = tunnel6_err, | |
141 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
142 | }; | |
143 | ||
73d605d1 KM |
144 | static struct inet6_protocol tunnel46_protocol = { |
145 | .handler = tunnel46_rcv, | |
146 | .err_handler = tunnel6_err, | |
147 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
148 | }; | |
149 | ||
d2acc347 HX |
150 | static int __init tunnel6_init(void) |
151 | { | |
152 | if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) { | |
153 | printk(KERN_ERR "tunnel6 init(): can't add protocol\n"); | |
154 | return -EAGAIN; | |
155 | } | |
73d605d1 KM |
156 | if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) { |
157 | printk(KERN_ERR "tunnel6 init(): can't add protocol\n"); | |
158 | inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6); | |
159 | return -EAGAIN; | |
160 | } | |
d2acc347 HX |
161 | return 0; |
162 | } | |
163 | ||
164 | static void __exit tunnel6_fini(void) | |
165 | { | |
73d605d1 KM |
166 | if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP)) |
167 | printk(KERN_ERR "tunnel6 close: can't remove protocol\n"); | |
d2acc347 HX |
168 | if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6)) |
169 | printk(KERN_ERR "tunnel6 close: can't remove protocol\n"); | |
170 | } | |
171 | ||
172 | module_init(tunnel6_init); | |
173 | module_exit(tunnel6_fini); | |
174 | MODULE_LICENSE("GPL"); |