xt_mark.c
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/* Kernel module to match NFMARK values. */
/* (C) 1999-2001 Marc Boucher <marc@mbsi.ca>
*
* 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/netfilter/xt_mark.h>
#include <linux/netfilter/x_tables.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
MODULE_DESCRIPTION("iptables mark matching module");
MODULE_ALIAS("ipt_mark");
MODULE_ALIAS("ip6t_mark");
static int
match(const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
const struct xt_match *match,
const void *matchinfo,
int offset,
unsigned int protoff,
int *hotdrop)
{
const struct xt_mark_info *info = matchinfo;
return ((skb->nfmark & info->mask) == info->mark) ^ info->invert;
}
static int
checkentry(const char *tablename,
const void *entry,
const struct xt_match *match,
void *matchinfo,
unsigned int matchsize,
unsigned int hook_mask)
{
const struct xt_mark_info *minfo = matchinfo;
if (minfo->mark > 0xffffffff || minfo->mask > 0xffffffff) {
printk(KERN_WARNING "mark: only supports 32bit mark\n");
return 0;
}
return 1;
}
static struct xt_match mark_match = {
.name = "mark",
.match = match,
.matchsize = sizeof(struct xt_mark_info),
.checkentry = checkentry,
.family = AF_INET,
.me = THIS_MODULE,
};
static struct xt_match mark6_match = {
.name = "mark",
.match = match,
.matchsize = sizeof(struct xt_mark_info),
.checkentry = checkentry,
.family = AF_INET6,
.me = THIS_MODULE,
};
static int __init xt_mark_init(void)
{
int ret;
ret = xt_register_match(&mark_match);
if (ret)
return ret;
ret = xt_register_match(&mark6_match);
if (ret)
xt_unregister_match(&mark_match);
return ret;
}
static void __exit xt_mark_fini(void)
{
xt_unregister_match(&mark_match);
xt_unregister_match(&mark6_match);
}
module_init(xt_mark_init);
module_exit(xt_mark_fini);