mirror of https://gitee.com/openkylin/linux.git
108 lines
2.9 KiB
C
108 lines
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>
|
||
|
|
|
||
|
|
/* Add encapsulation header.
|
||
|
|
*
|
||
|
|
* The top IP header will be constructed per draft-nikander-esp-beet-mode-06.txt.
|
||
|
|
* The following fields in it shall be filled in by x->type->output:
|
||
|
|
* payload_len
|
||
|
|
*
|
||
|
|
* On exit, skb->h will be set to the start of the encapsulation header to be
|
||
|
|
* filled in by x->type->output and skb->nh will be set to the nextheader field
|
||
|
|
* of the extension header directly preceding the encapsulation header, or in
|
||
|
|
* its absence, that of the top IP header. The value of skb->data will always
|
||
|
|
* point to the top IP header.
|
||
|
|
*/
|
||
|
|
static int xfrm6_beet_output(struct xfrm_state *x, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct ipv6hdr *iph, *top_iph;
|
||
|
|
u8 *prevhdr;
|
||
|
|
int hdr_len;
|
||
|
|
|
||
|
|
skb_push(skb, x->props.header_len);
|
||
|
|
iph = skb->nh.ipv6h;
|
||
|
|
|
||
|
|
hdr_len = ip6_find_1stfragopt(skb, &prevhdr);
|
||
|
|
skb->nh.raw = prevhdr - x->props.header_len;
|
||
|
|
skb->h.raw = skb->data + hdr_len;
|
||
|
|
memmove(skb->data, iph, hdr_len);
|
||
|
|
|
||
|
|
skb->nh.raw = skb->data;
|
||
|
|
top_iph = skb->nh.ipv6h;
|
||
|
|
skb->nh.raw = &top_iph->nexthdr;
|
||
|
|
skb->h.ipv6h = top_iph + 1;
|
||
|
|
|
||
|
|
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;
|
||
|
|
int size = sizeof(struct ipv6hdr);
|
||
|
|
int err = -EINVAL;
|
||
|
|
|
||
|
|
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
skb_push(skb, size);
|
||
|
|
memmove(skb->data, skb->nh.raw, size);
|
||
|
|
skb->nh.raw = skb->data;
|
||
|
|
|
||
|
|
skb->mac.raw = memmove(skb->data - skb->mac_len,
|
||
|
|
skb->mac.raw, skb->mac_len);
|
||
|
|
|
||
|
|
ip6h = skb->nh.ipv6h;
|
||
|
|
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 = {
|
||
|
|
.input = xfrm6_beet_input,
|
||
|
|
.output = xfrm6_beet_output,
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
.encap = XFRM_MODE_BEET,
|
||
|
|
};
|
||
|
|
|
||
|
|
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);
|