]>
Commit | Line | Data |
---|---|---|
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> | |
50fba2aa HX |
11 | #include <net/icmp.h> |
12 | #include <net/ip.h> | |
d2acc347 HX |
13 | #include <net/protocol.h> |
14 | #include <net/xfrm.h> | |
15 | ||
16 | static struct xfrm_tunnel *tunnel4_handlers; | |
c0d56408 | 17 | static struct xfrm_tunnel *tunnel64_handlers; |
d2acc347 HX |
18 | static DEFINE_MUTEX(tunnel4_mutex); |
19 | ||
c0d56408 | 20 | int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family) |
d2acc347 HX |
21 | { |
22 | struct xfrm_tunnel **pprev; | |
23 | int ret = -EEXIST; | |
24 | int priority = handler->priority; | |
25 | ||
26 | mutex_lock(&tunnel4_mutex); | |
27 | ||
c0d56408 KM |
28 | for (pprev = (family == AF_INET) ? &tunnel4_handlers : &tunnel64_handlers; |
29 | *pprev; pprev = &(*pprev)->next) { | |
d2acc347 HX |
30 | if ((*pprev)->priority > priority) |
31 | break; | |
32 | if ((*pprev)->priority == priority) | |
33 | goto err; | |
34 | } | |
35 | ||
36 | handler->next = *pprev; | |
37 | *pprev = handler; | |
38 | ||
39 | ret = 0; | |
40 | ||
41 | err: | |
42 | mutex_unlock(&tunnel4_mutex); | |
43 | ||
44 | return ret; | |
45 | } | |
46 | ||
47 | EXPORT_SYMBOL(xfrm4_tunnel_register); | |
48 | ||
c0d56408 | 49 | int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family) |
d2acc347 HX |
50 | { |
51 | struct xfrm_tunnel **pprev; | |
52 | int ret = -ENOENT; | |
53 | ||
54 | mutex_lock(&tunnel4_mutex); | |
55 | ||
c0d56408 KM |
56 | for (pprev = (family == AF_INET) ? &tunnel4_handlers : &tunnel64_handlers; |
57 | *pprev; pprev = &(*pprev)->next) { | |
d2acc347 HX |
58 | if (*pprev == handler) { |
59 | *pprev = handler->next; | |
60 | ret = 0; | |
61 | break; | |
62 | } | |
63 | } | |
64 | ||
65 | mutex_unlock(&tunnel4_mutex); | |
66 | ||
67 | synchronize_net(); | |
68 | ||
69 | return ret; | |
70 | } | |
71 | ||
72 | EXPORT_SYMBOL(xfrm4_tunnel_deregister); | |
73 | ||
74 | static int tunnel4_rcv(struct sk_buff *skb) | |
75 | { | |
76 | struct xfrm_tunnel *handler; | |
77 | ||
50fba2aa HX |
78 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
79 | goto drop; | |
80 | ||
d2acc347 HX |
81 | for (handler = tunnel4_handlers; handler; handler = handler->next) |
82 | if (!handler->handler(skb)) | |
83 | return 0; | |
84 | ||
50fba2aa HX |
85 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
86 | ||
87 | drop: | |
d2acc347 HX |
88 | kfree_skb(skb); |
89 | return 0; | |
90 | } | |
91 | ||
c0d56408 KM |
92 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
93 | static int tunnel64_rcv(struct sk_buff *skb) | |
94 | { | |
95 | struct xfrm_tunnel *handler; | |
96 | ||
97 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
98 | goto drop; | |
99 | ||
100 | for (handler = tunnel64_handlers; handler; handler = handler->next) | |
101 | if (!handler->handler(skb)) | |
102 | return 0; | |
103 | ||
104 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); | |
105 | ||
106 | drop: | |
107 | kfree_skb(skb); | |
108 | return 0; | |
109 | } | |
110 | #endif | |
111 | ||
d2acc347 HX |
112 | static void tunnel4_err(struct sk_buff *skb, u32 info) |
113 | { | |
114 | struct xfrm_tunnel *handler; | |
115 | ||
116 | for (handler = tunnel4_handlers; handler; handler = handler->next) | |
117 | if (!handler->err_handler(skb, info)) | |
118 | break; | |
119 | } | |
120 | ||
99f93326 PE |
121 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
122 | static void tunnel64_err(struct sk_buff *skb, u32 info) | |
123 | { | |
124 | struct xfrm_tunnel *handler; | |
125 | ||
126 | for (handler = tunnel64_handlers; handler; handler = handler->next) | |
127 | if (!handler->err_handler(skb, info)) | |
128 | break; | |
129 | } | |
130 | #endif | |
131 | ||
d2acc347 HX |
132 | static struct net_protocol tunnel4_protocol = { |
133 | .handler = tunnel4_rcv, | |
134 | .err_handler = tunnel4_err, | |
135 | .no_policy = 1, | |
136 | }; | |
137 | ||
c0d56408 KM |
138 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
139 | static struct net_protocol tunnel64_protocol = { | |
140 | .handler = tunnel64_rcv, | |
99f93326 | 141 | .err_handler = tunnel64_err, |
c0d56408 KM |
142 | .no_policy = 1, |
143 | }; | |
144 | #endif | |
145 | ||
d2acc347 HX |
146 | static int __init tunnel4_init(void) |
147 | { | |
148 | if (inet_add_protocol(&tunnel4_protocol, IPPROTO_IPIP)) { | |
149 | printk(KERN_ERR "tunnel4 init: can't add protocol\n"); | |
150 | return -EAGAIN; | |
151 | } | |
c0d56408 KM |
152 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
153 | if (inet_add_protocol(&tunnel64_protocol, IPPROTO_IPV6)) { | |
154 | printk(KERN_ERR "tunnel64 init: can't add protocol\n"); | |
155 | inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP); | |
156 | return -EAGAIN; | |
157 | } | |
158 | #endif | |
d2acc347 HX |
159 | return 0; |
160 | } | |
161 | ||
162 | static void __exit tunnel4_fini(void) | |
163 | { | |
c0d56408 KM |
164 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
165 | if (inet_del_protocol(&tunnel64_protocol, IPPROTO_IPV6)) | |
166 | printk(KERN_ERR "tunnel64 close: can't remove protocol\n"); | |
167 | #endif | |
d2acc347 HX |
168 | if (inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP)) |
169 | printk(KERN_ERR "tunnel4 close: can't remove protocol\n"); | |
170 | } | |
171 | ||
172 | module_init(tunnel4_init); | |
173 | module_exit(tunnel4_fini); | |
174 | MODULE_LICENSE("GPL"); |