114 строки
2.9 KiB
C
114 строки
2.9 KiB
C
/*
|
|
* xfrm6_mode_beet.c - BEET mode encapsulation for IPv6.
|
|
*
|
|
* Copyright (c) 2006 Diego Beltrami <diego.beltrami@gmail.com>
|
|
* Miika Komu <miika@iki.fi>
|
|
* Herbert Xu <herbert@gondor.apana.org.au>
|
|
* Abhinav Pathak <abhinav.pathak@hiit.fi>
|
|
* Jeff Ahrenholz <ahrenholz@gmail.com>
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/stringify.h>
|
|
#include <net/dsfield.h>
|
|
#include <net/dst.h>
|
|
#include <net/inet_ecn.h>
|
|
#include <net/ipv6.h>
|
|
#include <net/xfrm.h>
|
|
|
|
static void xfrm6_beet_make_header(struct sk_buff *skb)
|
|
{
|
|
struct ipv6hdr *iph = ipv6_hdr(skb);
|
|
|
|
iph->version = 6;
|
|
|
|
memcpy(iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl,
|
|
sizeof(iph->flow_lbl));
|
|
iph->nexthdr = XFRM_MODE_SKB_CB(skb)->protocol;
|
|
|
|
ipv6_change_dsfield(iph, 0, XFRM_MODE_SKB_CB(skb)->tos);
|
|
iph->hop_limit = XFRM_MODE_SKB_CB(skb)->ttl;
|
|
}
|
|
|
|
/* Add encapsulation header.
|
|
*
|
|
* The top IP header will be constructed per draft-nikander-esp-beet-mode-06.txt.
|
|
*/
|
|
static int xfrm6_beet_output(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
struct ipv6hdr *top_iph;
|
|
|
|
skb_set_network_header(skb, -x->props.header_len);
|
|
skb->mac_header = skb->network_header +
|
|
offsetof(struct ipv6hdr, nexthdr);
|
|
skb->transport_header = skb->network_header + sizeof(*top_iph);
|
|
|
|
xfrm6_beet_make_header(skb);
|
|
|
|
top_iph = ipv6_hdr(skb);
|
|
|
|
ipv6_addr_copy(&top_iph->saddr, (struct in6_addr *)&x->props.saddr);
|
|
ipv6_addr_copy(&top_iph->daddr, (struct in6_addr *)&x->id.daddr);
|
|
return 0;
|
|
}
|
|
|
|
static int xfrm6_beet_input(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
struct ipv6hdr *ip6h;
|
|
const unsigned char *old_mac;
|
|
int size = sizeof(struct ipv6hdr);
|
|
int err;
|
|
|
|
err = skb_cow_head(skb, size + skb->mac_len);
|
|
if (err)
|
|
goto out;
|
|
|
|
__skb_push(skb, size);
|
|
skb_reset_network_header(skb);
|
|
|
|
old_mac = skb_mac_header(skb);
|
|
skb_set_mac_header(skb, -skb->mac_len);
|
|
memmove(skb_mac_header(skb), old_mac, skb->mac_len);
|
|
|
|
xfrm6_beet_make_header(skb);
|
|
|
|
ip6h = ipv6_hdr(skb);
|
|
ip6h->payload_len = htons(skb->len - size);
|
|
ipv6_addr_copy(&ip6h->daddr, (struct in6_addr *) &x->sel.daddr.a6);
|
|
ipv6_addr_copy(&ip6h->saddr, (struct in6_addr *) &x->sel.saddr.a6);
|
|
err = 0;
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static struct xfrm_mode xfrm6_beet_mode = {
|
|
.input2 = xfrm6_beet_input,
|
|
.input = xfrm_prepare_input,
|
|
.output2 = xfrm6_beet_output,
|
|
.output = xfrm6_prepare_output,
|
|
.owner = THIS_MODULE,
|
|
.encap = XFRM_MODE_BEET,
|
|
.flags = XFRM_MODE_FLAG_TUNNEL,
|
|
};
|
|
|
|
static int __init xfrm6_beet_init(void)
|
|
{
|
|
return xfrm_register_mode(&xfrm6_beet_mode, AF_INET6);
|
|
}
|
|
|
|
static void __exit xfrm6_beet_exit(void)
|
|
{
|
|
int err;
|
|
|
|
err = xfrm_unregister_mode(&xfrm6_beet_mode, AF_INET6);
|
|
BUG_ON(err);
|
|
}
|
|
|
|
module_init(xfrm6_beet_init);
|
|
module_exit(xfrm6_beet_exit);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_BEET);
|