PageRenderTime 32ms CodeModel.GetById 19ms app.highlight 10ms RepoModel.GetById 0ms app.codeStats 0ms

/net/ipv4/xfrm4_tunnel.c

https://bitbucket.org/abioy/linux
C | 113 lines | 92 code | 17 blank | 4 comment | 12 complexity | 64981354817d30f08a5046241c3fc132 MD5 | raw file
Possible License(s): CC-BY-SA-3.0, GPL-2.0, LGPL-2.0, AGPL-1.0
  1/* xfrm4_tunnel.c: Generic IP tunnel transformer.
  2 *
  3 * Copyright (C) 2003 David S. Miller (davem@redhat.com)
  4 */
  5
  6#include <linux/skbuff.h>
  7#include <linux/module.h>
  8#include <linux/mutex.h>
  9#include <net/xfrm.h>
 10#include <net/ip.h>
 11#include <net/protocol.h>
 12
 13static int ipip_output(struct xfrm_state *x, struct sk_buff *skb)
 14{
 15	skb_push(skb, -skb_network_offset(skb));
 16	return 0;
 17}
 18
 19static int ipip_xfrm_rcv(struct xfrm_state *x, struct sk_buff *skb)
 20{
 21	return ip_hdr(skb)->protocol;
 22}
 23
 24static int ipip_init_state(struct xfrm_state *x)
 25{
 26	if (x->props.mode != XFRM_MODE_TUNNEL)
 27		return -EINVAL;
 28
 29	if (x->encap)
 30		return -EINVAL;
 31
 32	x->props.header_len = sizeof(struct iphdr);
 33
 34	return 0;
 35}
 36
 37static void ipip_destroy(struct xfrm_state *x)
 38{
 39}
 40
 41static const struct xfrm_type ipip_type = {
 42	.description	= "IPIP",
 43	.owner		= THIS_MODULE,
 44	.proto	     	= IPPROTO_IPIP,
 45	.init_state	= ipip_init_state,
 46	.destructor	= ipip_destroy,
 47	.input		= ipip_xfrm_rcv,
 48	.output		= ipip_output
 49};
 50
 51static int xfrm_tunnel_rcv(struct sk_buff *skb)
 52{
 53	return xfrm4_rcv_spi(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr);
 54}
 55
 56static int xfrm_tunnel_err(struct sk_buff *skb, u32 info)
 57{
 58	return -ENOENT;
 59}
 60
 61static struct xfrm_tunnel xfrm_tunnel_handler = {
 62	.handler	=	xfrm_tunnel_rcv,
 63	.err_handler	=	xfrm_tunnel_err,
 64	.priority	=	2,
 65};
 66
 67#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 68static struct xfrm_tunnel xfrm64_tunnel_handler = {
 69	.handler	=	xfrm_tunnel_rcv,
 70	.err_handler	=	xfrm_tunnel_err,
 71	.priority	=	2,
 72};
 73#endif
 74
 75static int __init ipip_init(void)
 76{
 77	if (xfrm_register_type(&ipip_type, AF_INET) < 0) {
 78		printk(KERN_INFO "ipip init: can't add xfrm type\n");
 79		return -EAGAIN;
 80	}
 81
 82	if (xfrm4_tunnel_register(&xfrm_tunnel_handler, AF_INET)) {
 83		printk(KERN_INFO "ipip init: can't add xfrm handler for AF_INET\n");
 84		xfrm_unregister_type(&ipip_type, AF_INET);
 85		return -EAGAIN;
 86	}
 87#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 88	if (xfrm4_tunnel_register(&xfrm64_tunnel_handler, AF_INET6)) {
 89		printk(KERN_INFO "ipip init: can't add xfrm handler for AF_INET6\n");
 90		xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET);
 91		xfrm_unregister_type(&ipip_type, AF_INET);
 92		return -EAGAIN;
 93	}
 94#endif
 95	return 0;
 96}
 97
 98static void __exit ipip_fini(void)
 99{
100#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
101	if (xfrm4_tunnel_deregister(&xfrm64_tunnel_handler, AF_INET6))
102		printk(KERN_INFO "ipip close: can't remove xfrm handler for AF_INET6\n");
103#endif
104	if (xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET))
105		printk(KERN_INFO "ipip close: can't remove xfrm handler for AF_INET\n");
106	if (xfrm_unregister_type(&ipip_type, AF_INET) < 0)
107		printk(KERN_INFO "ipip close: can't remove xfrm type\n");
108}
109
110module_init(ipip_init);
111module_exit(ipip_fini);
112MODULE_LICENSE("GPL");
113MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_IPIP);