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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, 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 <net/ipv6.h> |
29 | #include <net/protocol.h> |
30 | #include <net/xfrm.h> |
31 | |
32 | static struct xfrm6_tunnel *tunnel6_handlers; |
33 | static struct xfrm6_tunnel *tunnel46_handlers; |
34 | static DEFINE_MUTEX(tunnel6_mutex); |
35 | |
36 | int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family) |
37 | { |
38 | struct xfrm6_tunnel **pprev; |
39 | int ret = -EEXIST; |
40 | int priority = handler->priority; |
41 | |
42 | mutex_lock(&tunnel6_mutex); |
43 | |
44 | for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers; |
45 | *pprev; pprev = &(*pprev)->next) { |
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 | |
65 | int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family) |
66 | { |
67 | struct xfrm6_tunnel **pprev; |
68 | int ret = -ENOENT; |
69 | |
70 | mutex_lock(&tunnel6_mutex); |
71 | |
72 | for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers; |
73 | *pprev; pprev = &(*pprev)->next) { |
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 *skb) |
91 | { |
92 | struct xfrm6_tunnel *handler; |
93 | |
94 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
95 | goto drop; |
96 | |
97 | for (handler = tunnel6_handlers; handler; handler = handler->next) |
98 | if (!handler->handler(skb)) |
99 | return 0; |
100 | |
101 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, skb->dev); |
102 | |
103 | drop: |
104 | kfree_skb(skb); |
105 | return 0; |
106 | } |
107 | |
108 | static int tunnel46_rcv(struct sk_buff *skb) |
109 | { |
110 | struct xfrm6_tunnel *handler; |
111 | |
112 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
113 | goto drop; |
114 | |
115 | for (handler = tunnel46_handlers; handler; handler = handler->next) |
116 | if (!handler->handler(skb)) |
117 | return 0; |
118 | |
119 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, skb->dev); |
120 | |
121 | drop: |
122 | kfree_skb(skb); |
123 | return 0; |
124 | } |
125 | |
126 | static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
127 | u8 type, u8 code, int offset, __be32 info) |
128 | { |
129 | struct xfrm6_tunnel *handler; |
130 | |
131 | for (handler = tunnel6_handlers; handler; handler = handler->next) |
132 | if (!handler->err_handler(skb, opt, type, code, offset, info)) |
133 | break; |
134 | } |
135 | |
136 | static const struct inet6_protocol tunnel6_protocol = { |
137 | .handler = tunnel6_rcv, |
138 | .err_handler = tunnel6_err, |
139 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
140 | }; |
141 | |
142 | static const struct inet6_protocol tunnel46_protocol = { |
143 | .handler = tunnel46_rcv, |
144 | .err_handler = tunnel6_err, |
145 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
146 | }; |
147 | |
148 | static int __init tunnel6_init(void) |
149 | { |
150 | if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) { |
151 | printk(KERN_ERR "tunnel6 init(): can't add protocol\n"); |
152 | return -EAGAIN; |
153 | } |
154 | if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) { |
155 | printk(KERN_ERR "tunnel6 init(): can't add protocol\n"); |
156 | inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6); |
157 | return -EAGAIN; |
158 | } |
159 | return 0; |
160 | } |
161 | |
162 | static void __exit tunnel6_fini(void) |
163 | { |
164 | if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP)) |
165 | printk(KERN_ERR "tunnel6 close: can't remove protocol\n"); |
166 | if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6)) |
167 | printk(KERN_ERR "tunnel6 close: can't remove protocol\n"); |
168 | } |
169 | |
170 | module_init(tunnel6_init); |
171 | module_exit(tunnel6_fini); |
172 | MODULE_LICENSE("GPL"); |
173 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9