mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 02:09:42 +00:00
![Jan Engelhardt](/assets/img/avatar_default.png)
Using ->family in struct xt_*_param, multiple struct xt_{match,target} can be squashed together. Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Patrick McHardy <kaber@trash.net>
166 lines
4.5 KiB
C
166 lines
4.5 KiB
C
/*
|
|
* xt_connmark - Netfilter module to match connection mark values
|
|
*
|
|
* Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
|
|
* by Henrik Nordstrom <hno@marasystems.com>
|
|
* 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 as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/skbuff.h>
|
|
#include <net/netfilter/nf_conntrack.h>
|
|
#include <linux/netfilter/x_tables.h>
|
|
#include <linux/netfilter/xt_connmark.h>
|
|
|
|
MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>");
|
|
MODULE_DESCRIPTION("Xtables: connection mark match");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("ipt_connmark");
|
|
MODULE_ALIAS("ip6t_connmark");
|
|
|
|
static bool
|
|
connmark_mt(const struct sk_buff *skb, const struct xt_match_param *par)
|
|
{
|
|
const struct xt_connmark_mtinfo1 *info = par->matchinfo;
|
|
enum ip_conntrack_info ctinfo;
|
|
const struct nf_conn *ct;
|
|
|
|
ct = nf_ct_get(skb, &ctinfo);
|
|
if (ct == NULL)
|
|
return false;
|
|
|
|
return ((ct->mark & info->mask) == info->mark) ^ info->invert;
|
|
}
|
|
|
|
static bool
|
|
connmark_mt_v0(const struct sk_buff *skb, const struct xt_match_param *par)
|
|
{
|
|
const struct xt_connmark_info *info = par->matchinfo;
|
|
const struct nf_conn *ct;
|
|
enum ip_conntrack_info ctinfo;
|
|
|
|
ct = nf_ct_get(skb, &ctinfo);
|
|
if (!ct)
|
|
return false;
|
|
|
|
return ((ct->mark & info->mask) == info->mark) ^ info->invert;
|
|
}
|
|
|
|
static bool connmark_mt_check_v0(const struct xt_mtchk_param *par)
|
|
{
|
|
const struct xt_connmark_info *cm = par->matchinfo;
|
|
|
|
if (cm->mark > 0xffffffff || cm->mask > 0xffffffff) {
|
|
printk(KERN_WARNING "connmark: only support 32bit mark\n");
|
|
return false;
|
|
}
|
|
if (nf_ct_l3proto_try_module_get(par->family) < 0) {
|
|
printk(KERN_WARNING "can't load conntrack support for "
|
|
"proto=%u\n", par->family);
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static bool connmark_mt_check(const struct xt_mtchk_param *par)
|
|
{
|
|
if (nf_ct_l3proto_try_module_get(par->family) < 0) {
|
|
printk(KERN_WARNING "cannot load conntrack support for "
|
|
"proto=%u\n", par->family);
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static void connmark_mt_destroy(const struct xt_mtdtor_param *par)
|
|
{
|
|
nf_ct_l3proto_module_put(par->family);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
struct compat_xt_connmark_info {
|
|
compat_ulong_t mark, mask;
|
|
u_int8_t invert;
|
|
u_int8_t __pad1;
|
|
u_int16_t __pad2;
|
|
};
|
|
|
|
static void connmark_mt_compat_from_user_v0(void *dst, void *src)
|
|
{
|
|
const struct compat_xt_connmark_info *cm = src;
|
|
struct xt_connmark_info m = {
|
|
.mark = cm->mark,
|
|
.mask = cm->mask,
|
|
.invert = cm->invert,
|
|
};
|
|
memcpy(dst, &m, sizeof(m));
|
|
}
|
|
|
|
static int connmark_mt_compat_to_user_v0(void __user *dst, void *src)
|
|
{
|
|
const struct xt_connmark_info *m = src;
|
|
struct compat_xt_connmark_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 connmark_mt_reg[] __read_mostly = {
|
|
{
|
|
.name = "connmark",
|
|
.revision = 0,
|
|
.family = NFPROTO_UNSPEC,
|
|
.checkentry = connmark_mt_check_v0,
|
|
.match = connmark_mt_v0,
|
|
.destroy = connmark_mt_destroy,
|
|
.matchsize = sizeof(struct xt_connmark_info),
|
|
#ifdef CONFIG_COMPAT
|
|
.compatsize = sizeof(struct compat_xt_connmark_info),
|
|
.compat_from_user = connmark_mt_compat_from_user_v0,
|
|
.compat_to_user = connmark_mt_compat_to_user_v0,
|
|
#endif
|
|
.me = THIS_MODULE
|
|
},
|
|
{
|
|
.name = "connmark",
|
|
.revision = 1,
|
|
.family = NFPROTO_UNSPEC,
|
|
.checkentry = connmark_mt_check,
|
|
.match = connmark_mt,
|
|
.matchsize = sizeof(struct xt_connmark_mtinfo1),
|
|
.destroy = connmark_mt_destroy,
|
|
.me = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init connmark_mt_init(void)
|
|
{
|
|
return xt_register_matches(connmark_mt_reg,
|
|
ARRAY_SIZE(connmark_mt_reg));
|
|
}
|
|
|
|
static void __exit connmark_mt_exit(void)
|
|
{
|
|
xt_unregister_matches(connmark_mt_reg, ARRAY_SIZE(connmark_mt_reg));
|
|
}
|
|
|
|
module_init(connmark_mt_init);
|
|
module_exit(connmark_mt_exit);
|