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/* Kernel module to match NFMARK values. */
/* (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/netfilter/xt_mark.h>
#include <linux/netfilter/x_tables.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
MODULE_DESCRIPTION("iptables mark matching module");
MODULE_ALIAS("ipt_mark");
MODULE_ALIAS("ip6t_mark");
static bool
match(const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
const struct xt_match *match,
const void *matchinfo,
int offset,
unsigned int protoff,
bool *hotdrop)
{
const struct xt_mark_info *info = matchinfo;
return ((skb->mark & info->mask) == info->mark) ^ info->invert;
}
static bool
checkentry(const char *tablename,
const void *entry,
const struct xt_match *match,
void *matchinfo,
unsigned int hook_mask)
{
const struct xt_mark_info *minfo = matchinfo;
if (minfo->mark > 0xffffffff || minfo->mask > 0xffffffff) {
printk(KERN_WARNING "mark: only supports 32bit mark\n");
return false;
}
return true;
}
#ifdef CONFIG_COMPAT
struct compat_xt_mark_info {
compat_ulong_t mark, mask;
u_int8_t invert;
u_int8_t __pad1;
u_int16_t __pad2;
};
static void compat_from_user(void *dst, void *src)
{
struct compat_xt_mark_info *cm = src;
struct xt_mark_info m = {
.mark = cm->mark,
.mask = cm->mask,
.invert = cm->invert,
};
memcpy(dst, &m, sizeof(m));
}
static int compat_to_user(void __user *dst, void *src)
{
struct xt_mark_info *m = src;
struct compat_xt_mark_info cm = {
.mark = m->mark,
.mask = m->mask,
.invert = m->invert,
};
return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0;
}
#endif /* CONFIG_COMPAT */
static struct xt_match xt_mark_match[] = {
{
.name = "mark",
.family = AF_INET,
.checkentry = checkentry,
.match = match,
.matchsize = sizeof(struct xt_mark_info),
#ifdef CONFIG_COMPAT
.compatsize = sizeof(struct compat_xt_mark_info),
.compat_from_user = compat_from_user,
.compat_to_user = compat_to_user,
#endif
.me = THIS_MODULE,
},
{
.name = "mark",
.family = AF_INET6,
.checkentry = checkentry,
.match = match,
.matchsize = sizeof(struct xt_mark_info),
.me = THIS_MODULE,
},
};
static int __init xt_mark_init(void)
{
return xt_register_matches(xt_mark_match, ARRAY_SIZE(xt_mark_match));
}
static void __exit xt_mark_fini(void)
{
xt_unregister_matches(xt_mark_match, ARRAY_SIZE(xt_mark_match));
}
module_init(xt_mark_init);
module_exit(xt_mark_fini);
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