155 lines
4.0 KiB
C
155 lines
4.0 KiB
C
/* This kernel module matches connection mark values set by the
|
|
* CONNMARK target
|
|
*
|
|
* Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
|
|
* by Henrik Nordstrom <hno@marasystems.com>
|
|
*
|
|
* 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>
|
|
|
|
MODULE_AUTHOR("Henrik Nordstrom <hno@marasytems.com>");
|
|
MODULE_DESCRIPTION("IP tables connmark match module");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("ipt_connmark");
|
|
|
|
#include <linux/netfilter/x_tables.h>
|
|
#include <linux/netfilter/xt_connmark.h>
|
|
#include <net/netfilter/nf_conntrack_compat.h>
|
|
|
|
static int
|
|
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,
|
|
int *hotdrop)
|
|
{
|
|
const struct xt_connmark_info *info = matchinfo;
|
|
u_int32_t ctinfo;
|
|
const u_int32_t *ctmark = nf_ct_get_mark(skb, &ctinfo);
|
|
if (!ctmark)
|
|
return 0;
|
|
|
|
return (((*ctmark) & info->mask) == info->mark) ^ info->invert;
|
|
}
|
|
|
|
static int
|
|
checkentry(const char *tablename,
|
|
const void *ip,
|
|
const struct xt_match *match,
|
|
void *matchinfo,
|
|
unsigned int hook_mask)
|
|
{
|
|
struct xt_connmark_info *cm = matchinfo;
|
|
|
|
if (cm->mark > 0xffffffff || cm->mask > 0xffffffff) {
|
|
printk(KERN_WARNING "connmark: only support 32bit mark\n");
|
|
return 0;
|
|
}
|
|
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
|
|
if (nf_ct_l3proto_try_module_get(match->family) < 0) {
|
|
printk(KERN_WARNING "can't load nf_conntrack support for "
|
|
"proto=%d\n", match->family);
|
|
return 0;
|
|
}
|
|
#endif
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
destroy(const struct xt_match *match, void *matchinfo)
|
|
{
|
|
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
|
|
nf_ct_l3proto_module_put(match->family);
|
|
#endif
|
|
}
|
|
|
|
#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 compat_from_user(void *dst, void *src)
|
|
{
|
|
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 compat_to_user(void __user *dst, void *src)
|
|
{
|
|
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 xt_connmark_match[] = {
|
|
{
|
|
.name = "connmark",
|
|
.family = AF_INET,
|
|
.checkentry = checkentry,
|
|
.match = match,
|
|
.destroy = destroy,
|
|
.matchsize = sizeof(struct xt_connmark_info),
|
|
#ifdef CONFIG_COMPAT
|
|
.compatsize = sizeof(struct compat_xt_connmark_info),
|
|
.compat_from_user = compat_from_user,
|
|
.compat_to_user = compat_to_user,
|
|
#endif
|
|
.me = THIS_MODULE
|
|
},
|
|
{
|
|
.name = "connmark",
|
|
.family = AF_INET6,
|
|
.checkentry = checkentry,
|
|
.match = match,
|
|
.destroy = destroy,
|
|
.matchsize = sizeof(struct xt_connmark_info),
|
|
.me = THIS_MODULE
|
|
},
|
|
};
|
|
|
|
static int __init xt_connmark_init(void)
|
|
{
|
|
need_conntrack();
|
|
return xt_register_matches(xt_connmark_match,
|
|
ARRAY_SIZE(xt_connmark_match));
|
|
}
|
|
|
|
static void __exit xt_connmark_fini(void)
|
|
{
|
|
xt_unregister_matches(xt_connmark_match, ARRAY_SIZE(xt_connmark_match));
|
|
}
|
|
|
|
module_init(xt_connmark_init);
|
|
module_exit(xt_connmark_fini);
|