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d2acc347 HX |
1 | /* tunnel4.c: Generic IP tunnel transformer. |
2 | * | |
3 | * Copyright (C) 2003 David S. Miller (davem@redhat.com) | |
4 | */ | |
5 | ||
6 | #include <linux/init.h> | |
7 | #include <linux/module.h> | |
8 | #include <linux/mutex.h> | |
9 | #include <linux/netdevice.h> | |
10 | #include <linux/skbuff.h> | |
11 | #include <net/protocol.h> | |
12 | #include <net/xfrm.h> | |
13 | ||
14 | static struct xfrm_tunnel *tunnel4_handlers; | |
15 | static DEFINE_MUTEX(tunnel4_mutex); | |
16 | ||
17 | int xfrm4_tunnel_register(struct xfrm_tunnel *handler) | |
18 | { | |
19 | struct xfrm_tunnel **pprev; | |
20 | int ret = -EEXIST; | |
21 | int priority = handler->priority; | |
22 | ||
23 | mutex_lock(&tunnel4_mutex); | |
24 | ||
25 | for (pprev = &tunnel4_handlers; *pprev; pprev = &(*pprev)->next) { | |
26 | if ((*pprev)->priority > priority) | |
27 | break; | |
28 | if ((*pprev)->priority == priority) | |
29 | goto err; | |
30 | } | |
31 | ||
32 | handler->next = *pprev; | |
33 | *pprev = handler; | |
34 | ||
35 | ret = 0; | |
36 | ||
37 | err: | |
38 | mutex_unlock(&tunnel4_mutex); | |
39 | ||
40 | return ret; | |
41 | } | |
42 | ||
43 | EXPORT_SYMBOL(xfrm4_tunnel_register); | |
44 | ||
45 | int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler) | |
46 | { | |
47 | struct xfrm_tunnel **pprev; | |
48 | int ret = -ENOENT; | |
49 | ||
50 | mutex_lock(&tunnel4_mutex); | |
51 | ||
52 | for (pprev = &tunnel4_handlers; *pprev; pprev = &(*pprev)->next) { | |
53 | if (*pprev == handler) { | |
54 | *pprev = handler->next; | |
55 | ret = 0; | |
56 | break; | |
57 | } | |
58 | } | |
59 | ||
60 | mutex_unlock(&tunnel4_mutex); | |
61 | ||
62 | synchronize_net(); | |
63 | ||
64 | return ret; | |
65 | } | |
66 | ||
67 | EXPORT_SYMBOL(xfrm4_tunnel_deregister); | |
68 | ||
69 | static int tunnel4_rcv(struct sk_buff *skb) | |
70 | { | |
71 | struct xfrm_tunnel *handler; | |
72 | ||
73 | for (handler = tunnel4_handlers; handler; handler = handler->next) | |
74 | if (!handler->handler(skb)) | |
75 | return 0; | |
76 | ||
77 | kfree_skb(skb); | |
78 | return 0; | |
79 | } | |
80 | ||
81 | static void tunnel4_err(struct sk_buff *skb, u32 info) | |
82 | { | |
83 | struct xfrm_tunnel *handler; | |
84 | ||
85 | for (handler = tunnel4_handlers; handler; handler = handler->next) | |
86 | if (!handler->err_handler(skb, info)) | |
87 | break; | |
88 | } | |
89 | ||
90 | static struct net_protocol tunnel4_protocol = { | |
91 | .handler = tunnel4_rcv, | |
92 | .err_handler = tunnel4_err, | |
93 | .no_policy = 1, | |
94 | }; | |
95 | ||
96 | static int __init tunnel4_init(void) | |
97 | { | |
98 | if (inet_add_protocol(&tunnel4_protocol, IPPROTO_IPIP)) { | |
99 | printk(KERN_ERR "tunnel4 init: can't add protocol\n"); | |
100 | return -EAGAIN; | |
101 | } | |
102 | return 0; | |
103 | } | |
104 | ||
105 | static void __exit tunnel4_fini(void) | |
106 | { | |
107 | if (inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP)) | |
108 | printk(KERN_ERR "tunnel4 close: can't remove protocol\n"); | |
109 | } | |
110 | ||
111 | module_init(tunnel4_init); | |
112 | module_exit(tunnel4_fini); | |
113 | MODULE_LICENSE("GPL"); |