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 __read_mostly
;
18 static struct xfrm_tunnel
*tunnel64_handlers __read_mostly
;
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
;
42 rcu_assign_pointer(*pprev
, handler
);
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 #define for_each_tunnel_rcu(head, handler) \
77 for (handler = rcu_dereference(head); \
79 handler = rcu_dereference(handler->next)) \
81 static int tunnel4_rcv(struct sk_buff
*skb
)
83 struct xfrm_tunnel
*handler
;
85 if (!pskb_may_pull(skb
, sizeof(struct iphdr
)))
88 for_each_tunnel_rcu(tunnel4_handlers
, handler
)
89 if (!handler
->handler(skb
))
92 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_PORT_UNREACH
, 0);
99 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
100 static int tunnel64_rcv(struct sk_buff
*skb
)
102 struct xfrm_tunnel
*handler
;
104 if (!pskb_may_pull(skb
, sizeof(struct ipv6hdr
)))
107 for_each_tunnel_rcu(tunnel64_handlers
, handler
)
108 if (!handler
->handler(skb
))
111 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_PORT_UNREACH
, 0);
119 static void tunnel4_err(struct sk_buff
*skb
, u32 info
)
121 struct xfrm_tunnel
*handler
;
123 for_each_tunnel_rcu(tunnel4_handlers
, handler
)
124 if (!handler
->err_handler(skb
, info
))
128 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
129 static void tunnel64_err(struct sk_buff
*skb
, u32 info
)
131 struct xfrm_tunnel
*handler
;
133 for_each_tunnel_rcu(tunnel64_handlers
, handler
)
134 if (!handler
->err_handler(skb
, info
))
139 static const struct net_protocol tunnel4_protocol
= {
140 .handler
= tunnel4_rcv
,
141 .err_handler
= tunnel4_err
,
146 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
147 static const struct net_protocol tunnel64_protocol
= {
148 .handler
= tunnel64_rcv
,
149 .err_handler
= tunnel64_err
,
155 static int __init
tunnel4_init(void)
157 if (inet_add_protocol(&tunnel4_protocol
, IPPROTO_IPIP
)) {
158 printk(KERN_ERR
"tunnel4 init: can't add protocol\n");
161 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
162 if (inet_add_protocol(&tunnel64_protocol
, IPPROTO_IPV6
)) {
163 printk(KERN_ERR
"tunnel64 init: can't add protocol\n");
164 inet_del_protocol(&tunnel4_protocol
, IPPROTO_IPIP
);
171 static void __exit
tunnel4_fini(void)
173 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
174 if (inet_del_protocol(&tunnel64_protocol
, IPPROTO_IPV6
))
175 printk(KERN_ERR
"tunnel64 close: can't remove protocol\n");
177 if (inet_del_protocol(&tunnel4_protocol
, IPPROTO_IPIP
))
178 printk(KERN_ERR
"tunnel4 close: can't remove protocol\n");
181 module_init(tunnel4_init
);
182 module_exit(tunnel4_fini
);
183 MODULE_LICENSE("GPL");