1bfcb10f67
Currently BEET mode does not reinject the packet back into the stack like tunnel mode does. Since BEET should behave just like tunnel mode this is incorrect. This patch fixes this by introducing a flags field to xfrm_mode that tells the IPsec code whether it should terminate and reinject the packet back into the stack. It then sets the flag for BEET and tunnel mode. I've also added a number of missing BEET checks elsewhere where we check whether a given mode is a tunnel or not. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
137 lines
3.3 KiB
C
137 lines
3.3 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>
|
|
|
|
/* 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 *iph, *top_iph;
|
|
int hdrlen, optlen;
|
|
|
|
iph = ip_hdr(skb);
|
|
|
|
hdrlen = 0;
|
|
optlen = iph->ihl * 4 - sizeof(*iph);
|
|
if (unlikely(optlen))
|
|
hdrlen += IPV4_BEET_PHMAXLEN - (optlen & 4);
|
|
|
|
skb_set_network_header(skb, IPV4_BEET_PHMAXLEN - x->props.header_len -
|
|
hdrlen);
|
|
skb->mac_header = skb->network_header +
|
|
offsetof(struct iphdr, protocol);
|
|
skb->transport_header = skb->network_header + sizeof(*iph);
|
|
|
|
ph = (struct ip_beet_phdr *)__skb_pull(skb, sizeof(*iph) - hdrlen);
|
|
|
|
top_iph = ip_hdr(skb);
|
|
memmove(top_iph, iph, sizeof(*iph));
|
|
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 = ip_hdr(skb);
|
|
int phlen = 0;
|
|
int optlen = 0;
|
|
u8 ph_nexthdr = 0;
|
|
int err = -EINVAL;
|
|
|
|
if (unlikely(iph->protocol == IPPROTO_BEETPH)) {
|
|
struct ip_beet_phdr *ph;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(*ph)))
|
|
goto out;
|
|
ph = (struct ip_beet_phdr *)(ipip_hdr(skb) + 1);
|
|
|
|
phlen = sizeof(*ph) + ph->padlen;
|
|
optlen = ph->hdrlen * 8 + (IPV4_BEET_PHMAXLEN - phlen);
|
|
if (optlen < 0 || optlen & 3 || optlen > 250)
|
|
goto out;
|
|
|
|
if (!pskb_may_pull(skb, phlen + optlen))
|
|
goto out;
|
|
skb->len -= phlen + optlen;
|
|
|
|
ph_nexthdr = ph->nexthdr;
|
|
}
|
|
|
|
skb_set_network_header(skb, phlen - sizeof(*iph));
|
|
memmove(skb_network_header(skb), iph, sizeof(*iph));
|
|
skb_set_transport_header(skb, phlen + optlen);
|
|
skb->data = skb_transport_header(skb);
|
|
|
|
iph = ip_hdr(skb);
|
|
iph->ihl = (sizeof(*iph) + optlen) / 4;
|
|
iph->tot_len = htons(skb->len + iph->ihl * 4);
|
|
iph->daddr = x->sel.daddr.a4;
|
|
iph->saddr = x->sel.saddr.a4;
|
|
if (ph_nexthdr)
|
|
iph->protocol = ph_nexthdr;
|
|
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 = {
|
|
.input = xfrm4_beet_input,
|
|
.output = xfrm4_beet_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);
|