mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Weilong Chen](/assets/img/avatar_default.png)
Signed-off-by: Weilong Chen <chenweilong@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
156 lines
3.7 KiB
C
156 lines
3.7 KiB
C
/*
|
|
* xfrm4_mode_beet.c - BEET mode encapsulation for IPv4.
|
|
*
|
|
* 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/dst.h>
|
|
#include <net/ip.h>
|
|
#include <net/xfrm.h>
|
|
|
|
static void xfrm4_beet_make_header(struct sk_buff *skb)
|
|
{
|
|
struct iphdr *iph = ip_hdr(skb);
|
|
|
|
iph->ihl = 5;
|
|
iph->version = 4;
|
|
|
|
iph->protocol = XFRM_MODE_SKB_CB(skb)->protocol;
|
|
iph->tos = XFRM_MODE_SKB_CB(skb)->tos;
|
|
|
|
iph->id = XFRM_MODE_SKB_CB(skb)->id;
|
|
iph->frag_off = XFRM_MODE_SKB_CB(skb)->frag_off;
|
|
iph->ttl = 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 xfrm4_beet_output(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
struct ip_beet_phdr *ph;
|
|
struct iphdr *top_iph;
|
|
int hdrlen, optlen;
|
|
|
|
hdrlen = 0;
|
|
optlen = XFRM_MODE_SKB_CB(skb)->optlen;
|
|
if (unlikely(optlen))
|
|
hdrlen += IPV4_BEET_PHMAXLEN - (optlen & 4);
|
|
|
|
skb_set_network_header(skb, -x->props.header_len -
|
|
hdrlen + (XFRM_MODE_SKB_CB(skb)->ihl - sizeof(*top_iph)));
|
|
if (x->sel.family != AF_INET6)
|
|
skb->network_header += IPV4_BEET_PHMAXLEN;
|
|
skb->mac_header = skb->network_header +
|
|
offsetof(struct iphdr, protocol);
|
|
skb->transport_header = skb->network_header + sizeof(*top_iph);
|
|
|
|
xfrm4_beet_make_header(skb);
|
|
|
|
ph = (struct ip_beet_phdr *)
|
|
__skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl - hdrlen);
|
|
|
|
top_iph = ip_hdr(skb);
|
|
|
|
if (unlikely(optlen)) {
|
|
BUG_ON(optlen < 0);
|
|
|
|
ph->padlen = 4 - (optlen & 4);
|
|
ph->hdrlen = optlen / 8;
|
|
ph->nexthdr = top_iph->protocol;
|
|
if (ph->padlen)
|
|
memset(ph + 1, IPOPT_NOP, ph->padlen);
|
|
|
|
top_iph->protocol = IPPROTO_BEETPH;
|
|
top_iph->ihl = sizeof(struct iphdr) / 4;
|
|
}
|
|
|
|
top_iph->saddr = x->props.saddr.a4;
|
|
top_iph->daddr = x->id.daddr.a4;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int xfrm4_beet_input(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
struct iphdr *iph;
|
|
int optlen = 0;
|
|
int err = -EINVAL;
|
|
|
|
if (unlikely(XFRM_MODE_SKB_CB(skb)->protocol == IPPROTO_BEETPH)) {
|
|
struct ip_beet_phdr *ph;
|
|
int phlen;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(*ph)))
|
|
goto out;
|
|
|
|
ph = (struct ip_beet_phdr *)skb->data;
|
|
|
|
phlen = sizeof(*ph) + ph->padlen;
|
|
optlen = ph->hdrlen * 8 + (IPV4_BEET_PHMAXLEN - phlen);
|
|
if (optlen < 0 || optlen & 3 || optlen > 250)
|
|
goto out;
|
|
|
|
XFRM_MODE_SKB_CB(skb)->protocol = ph->nexthdr;
|
|
|
|
if (!pskb_may_pull(skb, phlen))
|
|
goto out;
|
|
__skb_pull(skb, phlen);
|
|
}
|
|
|
|
skb_push(skb, sizeof(*iph));
|
|
skb_reset_network_header(skb);
|
|
skb_mac_header_rebuild(skb);
|
|
|
|
xfrm4_beet_make_header(skb);
|
|
|
|
iph = ip_hdr(skb);
|
|
|
|
iph->ihl += optlen / 4;
|
|
iph->tot_len = htons(skb->len);
|
|
iph->daddr = x->sel.daddr.a4;
|
|
iph->saddr = x->sel.saddr.a4;
|
|
iph->check = 0;
|
|
iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
|
|
err = 0;
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static struct xfrm_mode xfrm4_beet_mode = {
|
|
.input2 = xfrm4_beet_input,
|
|
.input = xfrm_prepare_input,
|
|
.output2 = xfrm4_beet_output,
|
|
.output = xfrm4_prepare_output,
|
|
.owner = THIS_MODULE,
|
|
.encap = XFRM_MODE_BEET,
|
|
.flags = XFRM_MODE_FLAG_TUNNEL,
|
|
};
|
|
|
|
static int __init xfrm4_beet_init(void)
|
|
{
|
|
return xfrm_register_mode(&xfrm4_beet_mode, AF_INET);
|
|
}
|
|
|
|
static void __exit xfrm4_beet_exit(void)
|
|
{
|
|
int err;
|
|
|
|
err = xfrm_unregister_mode(&xfrm4_beet_mode, AF_INET);
|
|
BUG_ON(err);
|
|
}
|
|
|
|
module_init(xfrm4_beet_init);
|
|
module_exit(xfrm4_beet_exit);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_XFRM_MODE(AF_INET, XFRM_MODE_BEET);
|