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/* ipv6header match - matches IPv6 packets based
on whether they contain certain headers */
/* Original idea: Brad Chapman
* Rewritten by: Andras Kis-Szabo <kisza@sch.bme.hu> */
/* (C) 2001-2002 Andras Kis-Szabo <kisza@sch.bme.hu>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ipv6.h>
#include <linux/types.h>
#include <net/checksum.h>
#include <net/ipv6.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <linux/netfilter_ipv6/ip6t_ipv6header.h>
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("IPv6 headers match");
MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
static int
ipv6header_match(const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
const void *matchinfo,
int offset,
unsigned int protoff,
int *hotdrop)
{
const struct ip6t_ipv6header_info *info = matchinfo;
unsigned int temp;
int len;
u8 nexthdr;
unsigned int ptr;
/* Make sure this isn't an evil packet */
/* type of the 1st exthdr */
nexthdr = skb->nh.ipv6h->nexthdr;
/* pointer to the 1st exthdr */
ptr = sizeof(struct ipv6hdr);
/* available length */
len = skb->len - ptr;
temp = 0;
while (ip6t_ext_hdr(nexthdr)) {
struct ipv6_opt_hdr _hdr, *hp;
int hdrlen;
/* Is there enough space for the next ext header? */
if (len < (int)sizeof(struct ipv6_opt_hdr))
return 0;
/* No more exthdr -> evaluate */
if (nexthdr == NEXTHDR_NONE) {
temp |= MASK_NONE;
break;
}
/* ESP -> evaluate */
if (nexthdr == NEXTHDR_ESP) {
temp |= MASK_ESP;
break;
}
hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
BUG_ON(hp == NULL);
/* Calculate the header length */
if (nexthdr == NEXTHDR_FRAGMENT) {
hdrlen = 8;
} else if (nexthdr == NEXTHDR_AUTH)
hdrlen = (hp->hdrlen+2)<<2;
else
hdrlen = ipv6_optlen(hp);
/* set the flag */
switch (nexthdr){
case NEXTHDR_HOP:
temp |= MASK_HOPOPTS;
break;
case NEXTHDR_ROUTING:
temp |= MASK_ROUTING;
break;
case NEXTHDR_FRAGMENT:
temp |= MASK_FRAGMENT;
break;
case NEXTHDR_AUTH:
temp |= MASK_AH;
break;
case NEXTHDR_DEST:
temp |= MASK_DSTOPTS;
break;
default:
return 0;
break;
}
nexthdr = hp->nexthdr;
len -= hdrlen;
ptr += hdrlen;
if (ptr > skb->len)
break;
}
if ( (nexthdr != NEXTHDR_NONE ) && (nexthdr != NEXTHDR_ESP) )
temp |= MASK_PROTO;
if (info->modeflag)
return !((temp ^ info->matchflags ^ info->invflags)
& info->matchflags);
else {
if (info->invflags)
return temp != info->matchflags;
else
return temp == info->matchflags;
}
}
static int
ipv6header_checkentry(const char *tablename,
const struct ip6t_ip6 *ip,
void *matchinfo,
unsigned int matchsize,
unsigned int hook_mask)
{
const struct ip6t_ipv6header_info *info = matchinfo;
/* Check for obvious errors */
/* This match is valid in all hooks! */
if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_ipv6header_info)))
return 0;
/* invflags is 0 or 0xff in hard mode */
if ((!info->modeflag) && info->invflags != 0x00
&& info->invflags != 0xFF)
return 0;
return 1;
}
static struct ip6t_match ip6t_ipv6header_match = {
.name = "ipv6header",
.match = &ipv6header_match,
.checkentry = &ipv6header_checkentry,
.destroy = NULL,
.me = THIS_MODULE,
};
static int __init ipv6header_init(void)
{
return ip6t_register_match(&ip6t_ipv6header_match);
}
static void __exit ipv6header_exit(void)
{
ip6t_unregister_match(&ip6t_ipv6header_match);
}
module_init(ipv6header_init);
module_exit(ipv6header_exit);
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