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/* This is a module which is used for setting the NFMARK field of an skb. */
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <net/checksum.h>
 
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <linux/netfilter_ipv6/ip6t_MARK.h>
 
static unsigned int
target(struct sk_buff **pskb,
       unsigned int hooknum,
       const struct net_device *in,
       const struct net_device *out,
       const void *targinfo,
       void *userinfo)
{
	const struct ip6t_mark_target_info *markinfo = targinfo;
 
	if((*pskb)->nfmark != markinfo->mark) {
		(*pskb)->nfmark = markinfo->mark;
		(*pskb)->nfcache |= NFC_ALTERED;
	}
	return IP6T_CONTINUE;
}
 
static int
checkentry(const char *tablename,
	   const struct ip6t_entry *e,
           void *targinfo,
           unsigned int targinfosize,
           unsigned int hook_mask)
{
	if (targinfosize != IP6T_ALIGN(sizeof(struct ip6t_mark_target_info))) {
		printk(KERN_WARNING "MARK: targinfosize %u != %Zu\n",
		       targinfosize,
		       IP6T_ALIGN(sizeof(struct ip6t_mark_target_info)));
		return 0;
	}
 
	if (strcmp(tablename, "mangle") != 0) {
		printk(KERN_WARNING "MARK: can only be called from \"mangle\" table, not \"%s\"\n", tablename);
		return 0;
	}
 
	return 1;
}
 
static struct ip6t_target ip6t_mark_reg
= { { NULL, NULL }, "MARK", target, checkentry, NULL, THIS_MODULE };
 
static int __init init(void)
{
	printk(KERN_DEBUG "registering ipv6 mark target\n");
	if (ip6t_register_target(&ip6t_mark_reg))
		return -EINVAL;
 
	return 0;
}
 
static void __exit fini(void)
{
	ip6t_unregister_target(&ip6t_mark_reg);
}
 
module_init(init);
module_exit(fini);
MODULE_LICENSE("GPL");