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> | |
5a0e3ad6 | 11 | #include <linux/slab.h> |
50fba2aa HX |
12 | #include <net/icmp.h> |
13 | #include <net/ip.h> | |
d2acc347 HX |
14 | #include <net/protocol.h> |
15 | #include <net/xfrm.h> | |
16 | ||
17 | static struct xfrm_tunnel *tunnel4_handlers; | |
c0d56408 | 18 | static struct xfrm_tunnel *tunnel64_handlers; |
d2acc347 HX |
19 | static DEFINE_MUTEX(tunnel4_mutex); |
20 | ||
358352b8 PE |
21 | static inline struct xfrm_tunnel **fam_handlers(unsigned short family) |
22 | { | |
23 | return (family == AF_INET) ? &tunnel4_handlers : &tunnel64_handlers; | |
24 | } | |
25 | ||
c0d56408 | 26 | int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family) |
d2acc347 HX |
27 | { |
28 | struct xfrm_tunnel **pprev; | |
29 | int ret = -EEXIST; | |
30 | int priority = handler->priority; | |
31 | ||
32 | mutex_lock(&tunnel4_mutex); | |
33 | ||
358352b8 | 34 | for (pprev = fam_handlers(family); *pprev; pprev = &(*pprev)->next) { |
d2acc347 HX |
35 | if ((*pprev)->priority > priority) |
36 | break; | |
37 | if ((*pprev)->priority == priority) | |
38 | goto err; | |
39 | } | |
40 | ||
41 | handler->next = *pprev; | |
42 | *pprev = handler; | |
43 | ||
44 | ret = 0; | |
45 | ||
46 | err: | |
47 | mutex_unlock(&tunnel4_mutex); | |
48 | ||
49 | return ret; | |
50 | } | |
51 | ||
52 | EXPORT_SYMBOL(xfrm4_tunnel_register); | |
53 | ||
c0d56408 | 54 | int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family) |
d2acc347 HX |
55 | { |
56 | struct xfrm_tunnel **pprev; | |
57 | int ret = -ENOENT; | |
58 | ||
59 | mutex_lock(&tunnel4_mutex); | |
60 | ||
358352b8 | 61 | for (pprev = fam_handlers(family); *pprev; pprev = &(*pprev)->next) { |
d2acc347 HX |
62 | if (*pprev == handler) { |
63 | *pprev = handler->next; | |
64 | ret = 0; | |
65 | break; | |
66 | } | |
67 | } | |
68 | ||
69 | mutex_unlock(&tunnel4_mutex); | |
70 | ||
71 | synchronize_net(); | |
72 | ||
73 | return ret; | |
74 | } | |
75 | ||
76 | EXPORT_SYMBOL(xfrm4_tunnel_deregister); | |
77 | ||
78 | static int tunnel4_rcv(struct sk_buff *skb) | |
79 | { | |
80 | struct xfrm_tunnel *handler; | |
81 | ||
50fba2aa HX |
82 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
83 | goto drop; | |
84 | ||
d2acc347 HX |
85 | for (handler = tunnel4_handlers; handler; handler = handler->next) |
86 | if (!handler->handler(skb)) | |
87 | return 0; | |
88 | ||
50fba2aa HX |
89 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
90 | ||
91 | drop: | |
d2acc347 HX |
92 | kfree_skb(skb); |
93 | return 0; | |
94 | } | |
95 | ||
c0d56408 KM |
96 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
97 | static int tunnel64_rcv(struct sk_buff *skb) | |
98 | { | |
99 | struct xfrm_tunnel *handler; | |
100 | ||
baa2bfb8 | 101 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
c0d56408 KM |
102 | goto drop; |
103 | ||
104 | for (handler = tunnel64_handlers; handler; handler = handler->next) | |
105 | if (!handler->handler(skb)) | |
106 | return 0; | |
107 | ||
108 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); | |
109 | ||
110 | drop: | |
111 | kfree_skb(skb); | |
112 | return 0; | |
113 | } | |
114 | #endif | |
115 | ||
d2acc347 HX |
116 | static void tunnel4_err(struct sk_buff *skb, u32 info) |
117 | { | |
118 | struct xfrm_tunnel *handler; | |
119 | ||
120 | for (handler = tunnel4_handlers; handler; handler = handler->next) | |
121 | if (!handler->err_handler(skb, info)) | |
122 | break; | |
123 | } | |
124 | ||
99f93326 PE |
125 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
126 | static void tunnel64_err(struct sk_buff *skb, u32 info) | |
127 | { | |
128 | struct xfrm_tunnel *handler; | |
129 | ||
130 | for (handler = tunnel64_handlers; handler; handler = handler->next) | |
131 | if (!handler->err_handler(skb, info)) | |
132 | break; | |
133 | } | |
134 | #endif | |
135 | ||
32613090 | 136 | static const struct net_protocol tunnel4_protocol = { |
d2acc347 HX |
137 | .handler = tunnel4_rcv, |
138 | .err_handler = tunnel4_err, | |
139 | .no_policy = 1, | |
4597a0ce | 140 | .netns_ok = 1, |
d2acc347 HX |
141 | }; |
142 | ||
c0d56408 | 143 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
32613090 | 144 | static const struct net_protocol tunnel64_protocol = { |
c0d56408 | 145 | .handler = tunnel64_rcv, |
99f93326 | 146 | .err_handler = tunnel64_err, |
c0d56408 | 147 | .no_policy = 1, |
b0970c42 | 148 | .netns_ok = 1, |
c0d56408 KM |
149 | }; |
150 | #endif | |
151 | ||
d2acc347 HX |
152 | static int __init tunnel4_init(void) |
153 | { | |
154 | if (inet_add_protocol(&tunnel4_protocol, IPPROTO_IPIP)) { | |
155 | printk(KERN_ERR "tunnel4 init: can't add protocol\n"); | |
156 | return -EAGAIN; | |
157 | } | |
c0d56408 KM |
158 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
159 | if (inet_add_protocol(&tunnel64_protocol, IPPROTO_IPV6)) { | |
160 | printk(KERN_ERR "tunnel64 init: can't add protocol\n"); | |
161 | inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP); | |
162 | return -EAGAIN; | |
163 | } | |
164 | #endif | |
d2acc347 HX |
165 | return 0; |
166 | } | |
167 | ||
168 | static void __exit tunnel4_fini(void) | |
169 | { | |
c0d56408 KM |
170 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
171 | if (inet_del_protocol(&tunnel64_protocol, IPPROTO_IPV6)) | |
172 | printk(KERN_ERR "tunnel64 close: can't remove protocol\n"); | |
173 | #endif | |
d2acc347 HX |
174 | if (inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP)) |
175 | printk(KERN_ERR "tunnel4 close: can't remove protocol\n"); | |
176 | } | |
177 | ||
178 | module_init(tunnel4_init); | |
179 | module_exit(tunnel4_fini); | |
180 | MODULE_LICENSE("GPL"); |