This patch does this for match extensions' checkentry functions. Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Patrick McHardy <kaber@trash.net>
120 lines
2.9 KiB
C
120 lines
2.9 KiB
C
/*
|
|
* xt_mark - Netfilter module to match NFMARK value
|
|
*
|
|
* (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/netfilter/xt_mark.h>
|
|
#include <linux/netfilter/x_tables.h>
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
|
|
MODULE_DESCRIPTION("Xtables: packet mark match");
|
|
MODULE_ALIAS("ipt_mark");
|
|
MODULE_ALIAS("ip6t_mark");
|
|
|
|
static bool
|
|
mark_mt_v0(const struct sk_buff *skb, const struct xt_match_param *par)
|
|
{
|
|
const struct xt_mark_info *info = par->matchinfo;
|
|
|
|
return ((skb->mark & info->mask) == info->mark) ^ info->invert;
|
|
}
|
|
|
|
static bool
|
|
mark_mt(const struct sk_buff *skb, const struct xt_match_param *par)
|
|
{
|
|
const struct xt_mark_mtinfo1 *info = par->matchinfo;
|
|
|
|
return ((skb->mark & info->mask) == info->mark) ^ info->invert;
|
|
}
|
|
|
|
static bool mark_mt_check_v0(const struct xt_mtchk_param *par)
|
|
{
|
|
const struct xt_mark_info *minfo = par->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 mark_mt_compat_from_user_v0(void *dst, void *src)
|
|
{
|
|
const 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 mark_mt_compat_to_user_v0(void __user *dst, void *src)
|
|
{
|
|
const 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 mark_mt_reg[] __read_mostly = {
|
|
{
|
|
.name = "mark",
|
|
.revision = 0,
|
|
.family = NFPROTO_UNSPEC,
|
|
.checkentry = mark_mt_check_v0,
|
|
.match = mark_mt_v0,
|
|
.matchsize = sizeof(struct xt_mark_info),
|
|
#ifdef CONFIG_COMPAT
|
|
.compatsize = sizeof(struct compat_xt_mark_info),
|
|
.compat_from_user = mark_mt_compat_from_user_v0,
|
|
.compat_to_user = mark_mt_compat_to_user_v0,
|
|
#endif
|
|
.me = THIS_MODULE,
|
|
},
|
|
{
|
|
.name = "mark",
|
|
.revision = 1,
|
|
.family = NFPROTO_UNSPEC,
|
|
.match = mark_mt,
|
|
.matchsize = sizeof(struct xt_mark_mtinfo1),
|
|
.me = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init mark_mt_init(void)
|
|
{
|
|
return xt_register_matches(mark_mt_reg, ARRAY_SIZE(mark_mt_reg));
|
|
}
|
|
|
|
static void __exit mark_mt_exit(void)
|
|
{
|
|
xt_unregister_matches(mark_mt_reg, ARRAY_SIZE(mark_mt_reg));
|
|
}
|
|
|
|
module_init(mark_mt_init);
|
|
module_exit(mark_mt_exit);
|