1 /* tunnel4.c: Generic IP tunnel transformer.
3 * Copyright (C) 2003 David S. Miller (davem@redhat.com)
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 <linux/slab.h>
14 #include <net/protocol.h>
17 static struct xfrm_tunnel
*tunnel4_handlers
;
18 static struct xfrm_tunnel
*tunnel64_handlers
;
19 static DEFINE_MUTEX(tunnel4_mutex
);
21 static inline struct xfrm_tunnel
**fam_handlers(unsigned short family
)
23 return (family
== AF_INET
) ? &tunnel4_handlers
: &tunnel64_handlers
;
26 int xfrm4_tunnel_register(struct xfrm_tunnel
*handler
, unsigned short family
)
28 struct xfrm_tunnel
**pprev
;
30 int priority
= handler
->priority
;
32 mutex_lock(&tunnel4_mutex
);
34 for (pprev
= fam_handlers(family
); *pprev
; pprev
= &(*pprev
)->next
) {
35 if ((*pprev
)->priority
> priority
)
37 if ((*pprev
)->priority
== priority
)
41 handler
->next
= *pprev
;
47 mutex_unlock(&tunnel4_mutex
);
51 EXPORT_SYMBOL(xfrm4_tunnel_register
);
53 int xfrm4_tunnel_deregister(struct xfrm_tunnel
*handler
, unsigned short family
)
55 struct xfrm_tunnel
**pprev
;
58 mutex_lock(&tunnel4_mutex
);
60 for (pprev
= fam_handlers(family
); *pprev
; pprev
= &(*pprev
)->next
) {
61 if (*pprev
== handler
) {
62 *pprev
= handler
->next
;
68 mutex_unlock(&tunnel4_mutex
);
74 EXPORT_SYMBOL(xfrm4_tunnel_deregister
);
76 static int tunnel4_rcv(struct sk_buff
*skb
)
78 struct xfrm_tunnel
*handler
;
80 if (!pskb_may_pull(skb
, sizeof(struct iphdr
)))
83 for (handler
= tunnel4_handlers
; handler
; handler
= handler
->next
)
84 if (!handler
->handler(skb
))
87 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_PORT_UNREACH
, 0);
94 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
95 static int tunnel64_rcv(struct sk_buff
*skb
)
97 struct xfrm_tunnel
*handler
;
99 if (!pskb_may_pull(skb
, sizeof(struct ipv6hdr
)))
102 for (handler
= tunnel64_handlers
; handler
; handler
= handler
->next
)
103 if (!handler
->handler(skb
))
106 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_PORT_UNREACH
, 0);
114 static void tunnel4_err(struct sk_buff
*skb
, u32 info
)
116 struct xfrm_tunnel
*handler
;
118 for (handler
= tunnel4_handlers
; handler
; handler
= handler
->next
)
119 if (!handler
->err_handler(skb
, info
))
123 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
124 static void tunnel64_err(struct sk_buff
*skb
, u32 info
)
126 struct xfrm_tunnel
*handler
;
128 for (handler
= tunnel64_handlers
; handler
; handler
= handler
->next
)
129 if (!handler
->err_handler(skb
, info
))
134 static const struct net_protocol tunnel4_protocol
= {
135 .handler
= tunnel4_rcv
,
136 .err_handler
= tunnel4_err
,
141 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
142 static const struct net_protocol tunnel64_protocol
= {
143 .handler
= tunnel64_rcv
,
144 .err_handler
= tunnel64_err
,
150 static int __init
tunnel4_init(void)
152 if (inet_add_protocol(&tunnel4_protocol
, IPPROTO_IPIP
)) {
153 printk(KERN_ERR
"tunnel4 init: can't add protocol\n");
156 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
157 if (inet_add_protocol(&tunnel64_protocol
, IPPROTO_IPV6
)) {
158 printk(KERN_ERR
"tunnel64 init: can't add protocol\n");
159 inet_del_protocol(&tunnel4_protocol
, IPPROTO_IPIP
);
166 static void __exit
tunnel4_fini(void)
168 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
169 if (inet_del_protocol(&tunnel64_protocol
, IPPROTO_IPV6
))
170 printk(KERN_ERR
"tunnel64 close: can't remove protocol\n");
172 if (inet_del_protocol(&tunnel4_protocol
, IPPROTO_IPIP
))
173 printk(KERN_ERR
"tunnel4 close: can't remove protocol\n");
176 module_init(tunnel4_init
);
177 module_exit(tunnel4_fini
);
178 MODULE_LICENSE("GPL");