xt_MARK.c
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/* This is a module which is used for setting the NFMARK field of an skb. */
/* (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/ip.h>
#include <net/checksum.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_MARK.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
MODULE_DESCRIPTION("ip[6]tables MARK modification module");
MODULE_ALIAS("ipt_MARK");
MODULE_ALIAS("ip6t_MARK");
static unsigned int
target_v0(struct sk_buff **pskb,
const struct net_device *in,
const struct net_device *out,
unsigned int hooknum,
const struct xt_target *target,
const void *targinfo,
void *userinfo)
{
const struct xt_mark_target_info *markinfo = targinfo;
if((*pskb)->nfmark != markinfo->mark)
(*pskb)->nfmark = markinfo->mark;
return XT_CONTINUE;
}
static unsigned int
target_v1(struct sk_buff **pskb,
const struct net_device *in,
const struct net_device *out,
unsigned int hooknum,
const struct xt_target *target,
const void *targinfo,
void *userinfo)
{
const struct xt_mark_target_info_v1 *markinfo = targinfo;
int mark = 0;
switch (markinfo->mode) {
case XT_MARK_SET:
mark = markinfo->mark;
break;
case XT_MARK_AND:
mark = (*pskb)->nfmark & markinfo->mark;
break;
case XT_MARK_OR:
mark = (*pskb)->nfmark | markinfo->mark;
break;
}
if((*pskb)->nfmark != mark)
(*pskb)->nfmark = mark;
return XT_CONTINUE;
}
static int
checkentry_v0(const char *tablename,
const void *entry,
const struct xt_target *target,
void *targinfo,
unsigned int targinfosize,
unsigned int hook_mask)
{
struct xt_mark_target_info *markinfo = targinfo;
if (markinfo->mark > 0xffffffff) {
printk(KERN_WARNING "MARK: Only supports 32bit wide mark\n");
return 0;
}
return 1;
}
static int
checkentry_v1(const char *tablename,
const void *entry,
const struct xt_target *target,
void *targinfo,
unsigned int targinfosize,
unsigned int hook_mask)
{
struct xt_mark_target_info_v1 *markinfo = targinfo;
if (markinfo->mode != XT_MARK_SET
&& markinfo->mode != XT_MARK_AND
&& markinfo->mode != XT_MARK_OR) {
printk(KERN_WARNING "MARK: unknown mode %u\n",
markinfo->mode);
return 0;
}
if (markinfo->mark > 0xffffffff) {
printk(KERN_WARNING "MARK: Only supports 32bit wide mark\n");
return 0;
}
return 1;
}
static struct xt_target ipt_mark_reg_v0 = {
.name = "MARK",
.target = target_v0,
.targetsize = sizeof(struct xt_mark_target_info),
.table = "mangle",
.checkentry = checkentry_v0,
.me = THIS_MODULE,
.family = AF_INET,
.revision = 0,
};
static struct xt_target ipt_mark_reg_v1 = {
.name = "MARK",
.target = target_v1,
.targetsize = sizeof(struct xt_mark_target_info_v1),
.table = "mangle",
.checkentry = checkentry_v1,
.me = THIS_MODULE,
.family = AF_INET,
.revision = 1,
};
static struct xt_target ip6t_mark_reg_v0 = {
.name = "MARK",
.target = target_v0,
.targetsize = sizeof(struct xt_mark_target_info),
.table = "mangle",
.checkentry = checkentry_v0,
.me = THIS_MODULE,
.family = AF_INET6,
.revision = 0,
};
static int __init xt_mark_init(void)
{
int err;
err = xt_register_target(&ipt_mark_reg_v0);
if (err)
return err;
err = xt_register_target(&ipt_mark_reg_v1);
if (err)
xt_unregister_target(&ipt_mark_reg_v0);
err = xt_register_target(&ip6t_mark_reg_v0);
if (err) {
xt_unregister_target(&ipt_mark_reg_v0);
xt_unregister_target(&ipt_mark_reg_v1);
}
return err;
}
static void __exit xt_mark_fini(void)
{
xt_unregister_target(&ipt_mark_reg_v0);
xt_unregister_target(&ipt_mark_reg_v1);
xt_unregister_target(&ip6t_mark_reg_v0);
}
module_init(xt_mark_init);
module_exit(xt_mark_fini);