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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) {
printk(KERN_WARNING "MARK: can only be called from \"mangle\" table, not \"%s\"\n", tablename);
return 0;
}
return 1;
}
static struct ipt_target ipt_mark_reg
= { { NULL, NULL }, "MARK", target, checkentry, NULL, THIS_MODULE };
static int __init init(void)
{
if (ipt_register_target(&ipt_mark_reg))
return -EINVAL;
return 0;
}
static void __exit fini(void)
{
ipt_unregister_target(&ipt_mark_reg);
}
module_init(init);
module_exit(fini);
MODULE_LICENSE("GPL");
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