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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 | ||
22 | #include <linux/init.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/mutex.h> | |
25 | #include <linux/netdevice.h> | |
26 | #include <linux/skbuff.h> | |
27 | #include <net/protocol.h> | |
28 | #include <net/xfrm.h> | |
29 | ||
30 | static struct xfrm6_tunnel *tunnel6_handlers; | |
31 | static DEFINE_MUTEX(tunnel6_mutex); | |
32 | ||
33 | int xfrm6_tunnel_register(struct xfrm6_tunnel *handler) | |
34 | { | |
35 | struct xfrm6_tunnel **pprev; | |
36 | int ret = -EEXIST; | |
37 | int priority = handler->priority; | |
38 | ||
39 | mutex_lock(&tunnel6_mutex); | |
40 | ||
41 | for (pprev = &tunnel6_handlers; *pprev; pprev = &(*pprev)->next) { | |
42 | if ((*pprev)->priority > priority) | |
43 | break; | |
44 | if ((*pprev)->priority == priority) | |
45 | goto err; | |
46 | } | |
47 | ||
48 | handler->next = *pprev; | |
49 | *pprev = handler; | |
50 | ||
51 | ret = 0; | |
52 | ||
53 | err: | |
54 | mutex_unlock(&tunnel6_mutex); | |
55 | ||
56 | return ret; | |
57 | } | |
58 | ||
59 | EXPORT_SYMBOL(xfrm6_tunnel_register); | |
60 | ||
61 | int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler) | |
62 | { | |
63 | struct xfrm6_tunnel **pprev; | |
64 | int ret = -ENOENT; | |
65 | ||
66 | mutex_lock(&tunnel6_mutex); | |
67 | ||
68 | for (pprev = &tunnel6_handlers; *pprev; pprev = &(*pprev)->next) { | |
69 | if (*pprev == handler) { | |
70 | *pprev = handler->next; | |
71 | ret = 0; | |
72 | break; | |
73 | } | |
74 | } | |
75 | ||
76 | mutex_unlock(&tunnel6_mutex); | |
77 | ||
78 | synchronize_net(); | |
79 | ||
80 | return ret; | |
81 | } | |
82 | ||
83 | EXPORT_SYMBOL(xfrm6_tunnel_deregister); | |
84 | ||
85 | static int tunnel6_rcv(struct sk_buff **pskb) | |
86 | { | |
87 | struct sk_buff *skb = *pskb; | |
88 | struct xfrm6_tunnel *handler; | |
89 | ||
90 | for (handler = tunnel6_handlers; handler; handler = handler->next) | |
91 | if (!handler->handler(skb)) | |
92 | return 0; | |
93 | ||
94 | kfree_skb(skb); | |
95 | return 0; | |
96 | } | |
97 | ||
98 | static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
99 | int type, int code, int offset, __u32 info) | |
100 | { | |
101 | struct xfrm6_tunnel *handler; | |
102 | ||
103 | for (handler = tunnel6_handlers; handler; handler = handler->next) | |
104 | if (!handler->err_handler(skb, opt, type, code, offset, info)) | |
105 | break; | |
106 | } | |
107 | ||
108 | static struct inet6_protocol tunnel6_protocol = { | |
109 | .handler = tunnel6_rcv, | |
110 | .err_handler = tunnel6_err, | |
111 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
112 | }; | |
113 | ||
114 | static int __init tunnel6_init(void) | |
115 | { | |
116 | if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) { | |
117 | printk(KERN_ERR "tunnel6 init(): can't add protocol\n"); | |
118 | return -EAGAIN; | |
119 | } | |
120 | return 0; | |
121 | } | |
122 | ||
123 | static void __exit tunnel6_fini(void) | |
124 | { | |
125 | if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6)) | |
126 | printk(KERN_ERR "tunnel6 close: can't remove protocol\n"); | |
127 | } | |
128 | ||
129 | module_init(tunnel6_init); | |
130 | module_exit(tunnel6_fini); | |
131 | MODULE_LICENSE("GPL"); |