ipt_mark.c

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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_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ipt_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 ipt_mark_target_info *markinfo = targinfo;

	if((*pskb)->nfmark != markinfo->mark) {
		(*pskb)->nfmark = markinfo->mark;
		(*pskb)->nfcache |= NFC_ALTERED;
	}
	return IPT_CONTINUE;
}

static int
checkentry(const char *tablename,
	   const struct ipt_entry *e,
           void *targinfo,
           unsigned int targinfosize,
           unsigned int hook_mask)
{
	if (targinfosize != IPT_ALIGN(sizeof(struct ipt_mark_target_info))) {
		printk(KERN_WARNING "MARK: targinfosize %u != %Zu\n",
		       targinfosize,
		       IPT_ALIGN(sizeof(struct ipt_mark_target_info)));
		return 0;
	}

	if (strcmp(tablename, "mangle") != 0) {