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/*
* xt_MARK - Netfilter module to modify the NFMARK field of an skb
*
* (C) 1999-2001 Marc Boucher <marc@mbsi.ca>
* Copyright © CC Computer Consultants GmbH, 2007 - 2008
* Jan Engelhardt <jengelh@computergmbh.de>
*
* 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("Xtables: packet mark modification");
MODULE_ALIAS("ipt_MARK");
MODULE_ALIAS("ip6t_MARK");
static unsigned int
mark_tg_v0(struct sk_buff *skb, const struct net_device *in,
const struct net_device *out, unsigned int hooknum,
const struct xt_target *target, const void *targinfo)
{
const struct xt_mark_target_info *markinfo = targinfo;
skb->mark = markinfo->mark;
return XT_CONTINUE;
}
static unsigned int
mark_tg_v1(struct sk_buff *skb, const struct net_device *in,
const struct net_device *out, unsigned int hooknum,
const struct xt_target *target, const void *targinfo)
{
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 = skb->mark & markinfo->mark;
break;
case XT_MARK_OR:
mark = skb->mark | markinfo->mark;
break;
}
skb->mark = mark;
return XT_CONTINUE;
}
static unsigned int
mark_tg(struct sk_buff *skb, const struct net_device *in,
const struct net_device *out, unsigned int hooknum,
const struct xt_target *target, const void *targinfo)
{
const struct xt_mark_tginfo2 *info = targinfo;
skb->mark = (skb->mark & ~info->mask) ^ info->mark;
return XT_CONTINUE;
}
static bool
mark_tg_check_v0(const char *tablename, const void *entry,
const struct xt_target *target, void *targinfo,
unsigned int hook_mask)
{
const struct xt_mark_target_info *markinfo = targinfo;
if (markinfo->mark > 0xffffffff) {
printk(KERN_WARNING "MARK: Only supports 32bit wide mark\n");
return false;
}
return true;
}
static bool
mark_tg_check_v1(const char *tablename, const void *entry,
const struct xt_target *target, void *targinfo,
unsigned int hook_mask)
{
const 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 false;
}
if (markinfo->mark > 0xffffffff) {
printk(KERN_WARNING "MARK: Only supports 32bit wide mark\n");
return false;
}
return true;
}
#ifdef CONFIG_COMPAT
struct compat_xt_mark_target_info {
compat_ulong_t mark;
};
static void mark_tg_compat_from_user_v0(void *dst, void *src)
{
const struct compat_xt_mark_target_info *cm = src;
struct xt_mark_target_info m = {
.mark = cm->mark,
};
memcpy(dst, &m, sizeof(m));
}
static int mark_tg_compat_to_user_v0(void __user *dst, void *src)
{
const struct xt_mark_target_info *m = src;
struct compat_xt_mark_target_info cm = {
.mark = m->mark,
};
return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0;
}
struct compat_xt_mark_target_info_v1 {
compat_ulong_t mark;
u_int8_t mode;
u_int8_t __pad1;
u_int16_t __pad2;
};
static void mark_tg_compat_from_user_v1(void *dst, void *src)
{
const struct compat_xt_mark_target_info_v1 *cm = src;
struct xt_mark_target_info_v1 m = {
.mark = cm->mark,
.mode = cm->mode,
};
memcpy(dst, &m, sizeof(m));
}
static int mark_tg_compat_to_user_v1(void __user *dst, void *src)
{
const struct xt_mark_target_info_v1 *m = src;
struct compat_xt_mark_target_info_v1 cm = {
.mark = m->mark,
.mode = m->mode,
};
return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0;
}
#endif /* CONFIG_COMPAT */
static struct xt_target mark_tg_reg[] __read_mostly = {
{
.name = "MARK",
.family = NFPROTO_IPV4,
.revision = 0,
.checkentry = mark_tg_check_v0,
.target = mark_tg_v0,
.targetsize = sizeof(struct xt_mark_target_info),
#ifdef CONFIG_COMPAT
.compatsize = sizeof(struct compat_xt_mark_target_info),
.compat_from_user = mark_tg_compat_from_user_v0,
.compat_to_user = mark_tg_compat_to_user_v0,
#endif
.table = "mangle",
.me = THIS_MODULE,
},
{
.name = "MARK",
.family = NFPROTO_IPV4,
.revision = 1,
.checkentry = mark_tg_check_v1,
.target = mark_tg_v1,
.targetsize = sizeof(struct xt_mark_target_info_v1),
#ifdef CONFIG_COMPAT
.compatsize = sizeof(struct compat_xt_mark_target_info_v1),
.compat_from_user = mark_tg_compat_from_user_v1,
.compat_to_user = mark_tg_compat_to_user_v1,
#endif
.table = "mangle",
.me = THIS_MODULE,
},
{
.name = "MARK",
.family = NFPROTO_IPV6,
.revision = 0,
.checkentry = mark_tg_check_v0,
.target = mark_tg_v0,
.targetsize = sizeof(struct xt_mark_target_info),
#ifdef CONFIG_COMPAT
.compatsize = sizeof(struct compat_xt_mark_target_info),
.compat_from_user = mark_tg_compat_from_user_v0,
.compat_to_user = mark_tg_compat_to_user_v0,
#endif
.table = "mangle",
.me = THIS_MODULE,
},
{
.name = "MARK",
.family = NFPROTO_IPV6,
.revision = 1,
.checkentry = mark_tg_check_v1,
.target = mark_tg_v1,
.targetsize = sizeof(struct xt_mark_target_info_v1),
#ifdef CONFIG_COMPAT
.compatsize = sizeof(struct compat_xt_mark_target_info_v1),
.compat_from_user = mark_tg_compat_from_user_v1,
.compat_to_user = mark_tg_compat_to_user_v1,
#endif
.table = "mangle",
.me = THIS_MODULE,
},
{
.name = "MARK",
.revision = 2,
.family = NFPROTO_IPV4,
.target = mark_tg,
.targetsize = sizeof(struct xt_mark_tginfo2),
.me = THIS_MODULE,
},
{
.name = "MARK",
.revision = 2,
.family = NFPROTO_IPV6,
.target = mark_tg,
.targetsize = sizeof(struct xt_mark_tginfo2),
.me = THIS_MODULE,
},
};
static int __init mark_tg_init(void)
{
return xt_register_targets(mark_tg_reg, ARRAY_SIZE(mark_tg_reg));
}
static void __exit mark_tg_exit(void)
{
xt_unregister_targets(mark_tg_reg, ARRAY_SIZE(mark_tg_reg));
}
module_init(mark_tg_init);
module_exit(mark_tg_exit);
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