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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; | |
33 | static DEFINE_MUTEX(tunnel6_mutex); | |
34 | ||
35 | int xfrm6_tunnel_register(struct xfrm6_tunnel *handler) | |
36 | { | |
37 | struct xfrm6_tunnel **pprev; | |
38 | int ret = -EEXIST; | |
39 | int priority = handler->priority; | |
40 | ||
41 | mutex_lock(&tunnel6_mutex); | |
42 | ||
43 | for (pprev = &tunnel6_handlers; *pprev; pprev = &(*pprev)->next) { | |
44 | if ((*pprev)->priority > priority) | |
45 | break; | |
46 | if ((*pprev)->priority == priority) | |
47 | goto err; | |
48 | } | |
49 | ||
50 | handler->next = *pprev; | |
51 | *pprev = handler; | |
52 | ||
53 | ret = 0; | |
54 | ||
55 | err: | |
56 | mutex_unlock(&tunnel6_mutex); | |
57 | ||
58 | return ret; | |
59 | } | |
60 | ||
61 | EXPORT_SYMBOL(xfrm6_tunnel_register); | |
62 | ||
63 | int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler) | |
64 | { | |
65 | struct xfrm6_tunnel **pprev; | |
66 | int ret = -ENOENT; | |
67 | ||
68 | mutex_lock(&tunnel6_mutex); | |
69 | ||
70 | for (pprev = &tunnel6_handlers; *pprev; pprev = &(*pprev)->next) { | |
71 | if (*pprev == handler) { | |
72 | *pprev = handler->next; | |
73 | ret = 0; | |
74 | break; | |
75 | } | |
76 | } | |
77 | ||
78 | mutex_unlock(&tunnel6_mutex); | |
79 | ||
80 | synchronize_net(); | |
81 | ||
82 | return ret; | |
83 | } | |
84 | ||
85 | EXPORT_SYMBOL(xfrm6_tunnel_deregister); | |
86 | ||
87 | static int tunnel6_rcv(struct sk_buff **pskb) | |
88 | { | |
89 | struct sk_buff *skb = *pskb; | |
90 | struct xfrm6_tunnel *handler; | |
91 | ||
50fba2aa HX |
92 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
93 | goto drop; | |
94 | ||
d2acc347 HX |
95 | for (handler = tunnel6_handlers; handler; handler = handler->next) |
96 | if (!handler->handler(skb)) | |
97 | return 0; | |
98 | ||
50fba2aa HX |
99 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, skb->dev); |
100 | ||
101 | drop: | |
d2acc347 HX |
102 | kfree_skb(skb); |
103 | return 0; | |
104 | } | |
105 | ||
106 | static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
107 | int type, int code, int offset, __u32 info) | |
108 | { | |
109 | struct xfrm6_tunnel *handler; | |
110 | ||
111 | for (handler = tunnel6_handlers; handler; handler = handler->next) | |
112 | if (!handler->err_handler(skb, opt, type, code, offset, info)) | |
113 | break; | |
114 | } | |
115 | ||
116 | static struct inet6_protocol tunnel6_protocol = { | |
117 | .handler = tunnel6_rcv, | |
118 | .err_handler = tunnel6_err, | |
119 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
120 | }; | |
121 | ||
122 | static int __init tunnel6_init(void) | |
123 | { | |
124 | if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) { | |
125 | printk(KERN_ERR "tunnel6 init(): can't add protocol\n"); | |
126 | return -EAGAIN; | |
127 | } | |
128 | return 0; | |
129 | } | |
130 | ||
131 | static void __exit tunnel6_fini(void) | |
132 | { | |
133 | if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6)) | |
134 | printk(KERN_ERR "tunnel6 close: can't remove protocol\n"); | |
135 | } | |
136 | ||
137 | module_init(tunnel6_init); | |
138 | module_exit(tunnel6_fini); | |
139 | MODULE_LICENSE("GPL"); |