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 <net/protocol.h>
14 static struct xfrm_tunnel
*tunnel4_handlers
;
15 static DEFINE_MUTEX(tunnel4_mutex
);
17 int xfrm4_tunnel_register(struct xfrm_tunnel
*handler
)
19 struct xfrm_tunnel
**pprev
;
21 int priority
= handler
->priority
;
23 mutex_lock(&tunnel4_mutex
);
25 for (pprev
= &tunnel4_handlers
; *pprev
; pprev
= &(*pprev
)->next
) {
26 if ((*pprev
)->priority
> priority
)
28 if ((*pprev
)->priority
== priority
)
32 handler
->next
= *pprev
;
38 mutex_unlock(&tunnel4_mutex
);
43 EXPORT_SYMBOL(xfrm4_tunnel_register
);
45 int xfrm4_tunnel_deregister(struct xfrm_tunnel
*handler
)
47 struct xfrm_tunnel
**pprev
;
50 mutex_lock(&tunnel4_mutex
);
52 for (pprev
= &tunnel4_handlers
; *pprev
; pprev
= &(*pprev
)->next
) {
53 if (*pprev
== handler
) {
54 *pprev
= handler
->next
;
60 mutex_unlock(&tunnel4_mutex
);
67 EXPORT_SYMBOL(xfrm4_tunnel_deregister
);
69 static int tunnel4_rcv(struct sk_buff
*skb
)
71 struct xfrm_tunnel
*handler
;
73 for (handler
= tunnel4_handlers
; handler
; handler
= handler
->next
)
74 if (!handler
->handler(skb
))
81 static void tunnel4_err(struct sk_buff
*skb
, u32 info
)
83 struct xfrm_tunnel
*handler
;
85 for (handler
= tunnel4_handlers
; handler
; handler
= handler
->next
)
86 if (!handler
->err_handler(skb
, info
))
90 static struct net_protocol tunnel4_protocol
= {
91 .handler
= tunnel4_rcv
,
92 .err_handler
= tunnel4_err
,
96 static int __init
tunnel4_init(void)
98 if (inet_add_protocol(&tunnel4_protocol
, IPPROTO_IPIP
)) {
99 printk(KERN_ERR
"tunnel4 init: can't add protocol\n");
105 static void __exit
tunnel4_fini(void)
107 if (inet_del_protocol(&tunnel4_protocol
, IPPROTO_IPIP
))
108 printk(KERN_ERR
"tunnel4 close: can't remove protocol\n");
111 module_init(tunnel4_init
);
112 module_exit(tunnel4_fini
);
113 MODULE_LICENSE("GPL");