2005-04-16 22:20:36 +00:00
|
|
|
/* This kernel module is used to modify the connection mark values, or
|
|
|
|
* to optionally restore the skb nfmark from the connection mark
|
|
|
|
*
|
|
|
|
* 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>
|
|
|
|
#include <linux/ip.h>
|
|
|
|
#include <net/checksum.h>
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Henrik Nordstrom <hno@marasytems.com>");
|
|
|
|
MODULE_DESCRIPTION("IP tables CONNMARK matching module");
|
|
|
|
MODULE_LICENSE("GPL");
|
[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables
This monster-patch tries to do the best job for unifying the data
structures and backend interfaces for the three evil clones ip_tables,
ip6_tables and arp_tables. In an ideal world we would never have
allowed this kind of copy+paste programming... but well, our world
isn't (yet?) ideal.
o introduce a new x_tables module
o {ip,arp,ip6}_tables depend on this x_tables module
o registration functions for tables, matches and targets are only
wrappers around x_tables provided functions
o all matches/targets that are used from ip_tables and ip6_tables
are now implemented as xt_FOOBAR.c files and provide module aliases
to ipt_FOOBAR and ip6t_FOOBAR
o header files for xt_matches are in include/linux/netfilter/,
include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers
around the xt_FOOBAR.h headers
Based on this patchset we're going to further unify the code,
gradually getting rid of all the layer 3 specific assumptions.
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-12 21:30:04 +00:00
|
|
|
MODULE_ALIAS("ipt_CONNMARK");
|
2007-10-11 21:36:40 +00:00
|
|
|
MODULE_ALIAS("ip6t_CONNMARK");
|
2005-04-16 22:20:36 +00:00
|
|
|
|
[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables
This monster-patch tries to do the best job for unifying the data
structures and backend interfaces for the three evil clones ip_tables,
ip6_tables and arp_tables. In an ideal world we would never have
allowed this kind of copy+paste programming... but well, our world
isn't (yet?) ideal.
o introduce a new x_tables module
o {ip,arp,ip6}_tables depend on this x_tables module
o registration functions for tables, matches and targets are only
wrappers around x_tables provided functions
o all matches/targets that are used from ip_tables and ip6_tables
are now implemented as xt_FOOBAR.c files and provide module aliases
to ipt_FOOBAR and ip6t_FOOBAR
o header files for xt_matches are in include/linux/netfilter/,
include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers
around the xt_FOOBAR.h headers
Based on this patchset we're going to further unify the code,
gradually getting rid of all the layer 3 specific assumptions.
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-12 21:30:04 +00:00
|
|
|
#include <linux/netfilter/x_tables.h>
|
|
|
|
#include <linux/netfilter/xt_CONNMARK.h>
|
2006-11-29 01:35:01 +00:00
|
|
|
#include <net/netfilter/nf_conntrack_ecache.h>
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
static unsigned int
|
|
|
|
target(struct sk_buff **pskb,
|
|
|
|
const struct net_device *in,
|
|
|
|
const struct net_device *out,
|
|
|
|
unsigned int hooknum,
|
2006-03-21 02:02:56 +00:00
|
|
|
const struct xt_target *target,
|
2006-08-22 07:35:47 +00:00
|
|
|
const void *targinfo)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables
This monster-patch tries to do the best job for unifying the data
structures and backend interfaces for the three evil clones ip_tables,
ip6_tables and arp_tables. In an ideal world we would never have
allowed this kind of copy+paste programming... but well, our world
isn't (yet?) ideal.
o introduce a new x_tables module
o {ip,arp,ip6}_tables depend on this x_tables module
o registration functions for tables, matches and targets are only
wrappers around x_tables provided functions
o all matches/targets that are used from ip_tables and ip6_tables
are now implemented as xt_FOOBAR.c files and provide module aliases
to ipt_FOOBAR and ip6t_FOOBAR
o header files for xt_matches are in include/linux/netfilter/,
include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers
around the xt_FOOBAR.h headers
Based on this patchset we're going to further unify the code,
gradually getting rid of all the layer 3 specific assumptions.
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-12 21:30:04 +00:00
|
|
|
const struct xt_connmark_target_info *markinfo = targinfo;
|
2007-03-14 23:37:25 +00:00
|
|
|
struct nf_conn *ct;
|
|
|
|
enum ip_conntrack_info ctinfo;
|
2005-08-10 02:22:01 +00:00
|
|
|
u_int32_t diff;
|
2006-11-09 23:19:14 +00:00
|
|
|
u_int32_t mark;
|
2005-08-10 02:22:01 +00:00
|
|
|
u_int32_t newmark;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2007-03-14 23:37:25 +00:00
|
|
|
ct = nf_ct_get(*pskb, &ctinfo);
|
|
|
|
if (ct) {
|
2006-08-22 07:33:26 +00:00
|
|
|
switch(markinfo->mode) {
|
|
|
|
case XT_CONNMARK_SET:
|
2007-03-14 23:37:25 +00:00
|
|
|
newmark = (ct->mark & ~markinfo->mask) | markinfo->mark;
|
|
|
|
if (newmark != ct->mark) {
|
|
|
|
ct->mark = newmark;
|
2006-08-22 07:33:26 +00:00
|
|
|
nf_conntrack_event_cache(IPCT_MARK, *pskb);
|
2007-02-07 23:06:43 +00:00
|
|
|
}
|
2006-08-22 07:33:26 +00:00
|
|
|
break;
|
|
|
|
case XT_CONNMARK_SAVE:
|
2007-03-14 23:37:25 +00:00
|
|
|
newmark = (ct->mark & ~markinfo->mask) |
|
2006-11-09 23:19:14 +00:00
|
|
|
((*pskb)->mark & markinfo->mask);
|
2007-03-14 23:37:25 +00:00
|
|
|
if (ct->mark != newmark) {
|
|
|
|
ct->mark = newmark;
|
2006-08-22 07:33:26 +00:00
|
|
|
nf_conntrack_event_cache(IPCT_MARK, *pskb);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case XT_CONNMARK_RESTORE:
|
2006-11-09 23:19:14 +00:00
|
|
|
mark = (*pskb)->mark;
|
2007-03-14 23:37:25 +00:00
|
|
|
diff = (ct->mark ^ mark) & markinfo->mask;
|
2007-02-07 23:06:43 +00:00
|
|
|
(*pskb)->mark = mark ^ diff;
|
2006-08-22 07:33:26 +00:00
|
|
|
break;
|
2006-08-22 07:31:24 +00:00
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables
This monster-patch tries to do the best job for unifying the data
structures and backend interfaces for the three evil clones ip_tables,
ip6_tables and arp_tables. In an ideal world we would never have
allowed this kind of copy+paste programming... but well, our world
isn't (yet?) ideal.
o introduce a new x_tables module
o {ip,arp,ip6}_tables depend on this x_tables module
o registration functions for tables, matches and targets are only
wrappers around x_tables provided functions
o all matches/targets that are used from ip_tables and ip6_tables
are now implemented as xt_FOOBAR.c files and provide module aliases
to ipt_FOOBAR and ip6t_FOOBAR
o header files for xt_matches are in include/linux/netfilter/,
include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers
around the xt_FOOBAR.h headers
Based on this patchset we're going to further unify the code,
gradually getting rid of all the layer 3 specific assumptions.
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-12 21:30:04 +00:00
|
|
|
return XT_CONTINUE;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2007-07-08 05:16:26 +00:00
|
|
|
static bool
|
2005-04-16 22:20:36 +00:00
|
|
|
checkentry(const char *tablename,
|
[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables
This monster-patch tries to do the best job for unifying the data
structures and backend interfaces for the three evil clones ip_tables,
ip6_tables and arp_tables. In an ideal world we would never have
allowed this kind of copy+paste programming... but well, our world
isn't (yet?) ideal.
o introduce a new x_tables module
o {ip,arp,ip6}_tables depend on this x_tables module
o registration functions for tables, matches and targets are only
wrappers around x_tables provided functions
o all matches/targets that are used from ip_tables and ip6_tables
are now implemented as xt_FOOBAR.c files and provide module aliases
to ipt_FOOBAR and ip6t_FOOBAR
o header files for xt_matches are in include/linux/netfilter/,
include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers
around the xt_FOOBAR.h headers
Based on this patchset we're going to further unify the code,
gradually getting rid of all the layer 3 specific assumptions.
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-12 21:30:04 +00:00
|
|
|
const void *entry,
|
2006-03-21 02:02:56 +00:00
|
|
|
const struct xt_target *target,
|
2005-04-16 22:20:36 +00:00
|
|
|
void *targinfo,
|
|
|
|
unsigned int hook_mask)
|
|
|
|
{
|
2007-07-08 05:16:55 +00:00
|
|
|
const struct xt_connmark_target_info *matchinfo = targinfo;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2006-12-12 08:29:02 +00:00
|
|
|
if (nf_ct_l3proto_try_module_get(target->family) < 0) {
|
|
|
|
printk(KERN_WARNING "can't load conntrack support for "
|
|
|
|
"proto=%d\n", target->family);
|
2007-07-08 05:16:26 +00:00
|
|
|
return false;
|
2006-12-12 08:29:02 +00:00
|
|
|
}
|
[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables
This monster-patch tries to do the best job for unifying the data
structures and backend interfaces for the three evil clones ip_tables,
ip6_tables and arp_tables. In an ideal world we would never have
allowed this kind of copy+paste programming... but well, our world
isn't (yet?) ideal.
o introduce a new x_tables module
o {ip,arp,ip6}_tables depend on this x_tables module
o registration functions for tables, matches and targets are only
wrappers around x_tables provided functions
o all matches/targets that are used from ip_tables and ip6_tables
are now implemented as xt_FOOBAR.c files and provide module aliases
to ipt_FOOBAR and ip6t_FOOBAR
o header files for xt_matches are in include/linux/netfilter/,
include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers
around the xt_FOOBAR.h headers
Based on this patchset we're going to further unify the code,
gradually getting rid of all the layer 3 specific assumptions.
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-12 21:30:04 +00:00
|
|
|
if (matchinfo->mode == XT_CONNMARK_RESTORE) {
|
2006-08-22 07:33:26 +00:00
|
|
|
if (strcmp(tablename, "mangle") != 0) {
|
|
|
|
printk(KERN_WARNING "CONNMARK: restore can only be "
|
|
|
|
"called from \"mangle\" table, not \"%s\"\n",
|
|
|
|
tablename);
|
2007-07-08 05:16:26 +00:00
|
|
|
return false;
|
2006-08-22 07:33:26 +00:00
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
2005-08-10 02:22:01 +00:00
|
|
|
if (matchinfo->mark > 0xffffffff || matchinfo->mask > 0xffffffff) {
|
|
|
|
printk(KERN_WARNING "CONNMARK: Only supports 32bit mark\n");
|
2007-07-08 05:16:26 +00:00
|
|
|
return false;
|
2005-08-10 02:22:01 +00:00
|
|
|
}
|
2007-07-08 05:16:26 +00:00
|
|
|
return true;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2006-12-12 08:29:02 +00:00
|
|
|
static void
|
|
|
|
destroy(const struct xt_target *target, void *targinfo)
|
|
|
|
{
|
|
|
|
nf_ct_l3proto_module_put(target->family);
|
|
|
|
}
|
|
|
|
|
2006-09-20 19:06:40 +00:00
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
struct compat_xt_connmark_target_info {
|
|
|
|
compat_ulong_t mark, mask;
|
|
|
|
u_int8_t mode;
|
|
|
|
u_int8_t __pad1;
|
|
|
|
u_int16_t __pad2;
|
|
|
|
};
|
|
|
|
|
|
|
|
static void compat_from_user(void *dst, void *src)
|
|
|
|
{
|
2007-07-08 05:16:55 +00:00
|
|
|
const struct compat_xt_connmark_target_info *cm = src;
|
2006-09-20 19:06:40 +00:00
|
|
|
struct xt_connmark_target_info m = {
|
|
|
|
.mark = cm->mark,
|
|
|
|
.mask = cm->mask,
|
|
|
|
.mode = cm->mode,
|
|
|
|
};
|
|
|
|
memcpy(dst, &m, sizeof(m));
|
|
|
|
}
|
|
|
|
|
|
|
|
static int compat_to_user(void __user *dst, void *src)
|
|
|
|
{
|
2007-07-08 05:16:55 +00:00
|
|
|
const struct xt_connmark_target_info *m = src;
|
2006-09-20 19:06:40 +00:00
|
|
|
struct compat_xt_connmark_target_info cm = {
|
|
|
|
.mark = m->mark,
|
|
|
|
.mask = m->mask,
|
|
|
|
.mode = m->mode,
|
|
|
|
};
|
|
|
|
return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0;
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_COMPAT */
|
|
|
|
|
2007-07-08 05:22:02 +00:00
|
|
|
static struct xt_target xt_connmark_target[] __read_mostly = {
|
2006-08-22 07:34:04 +00:00
|
|
|
{
|
|
|
|
.name = "CONNMARK",
|
|
|
|
.family = AF_INET,
|
|
|
|
.checkentry = checkentry,
|
2006-12-12 08:29:02 +00:00
|
|
|
.destroy = destroy,
|
2006-08-22 07:34:04 +00:00
|
|
|
.target = target,
|
|
|
|
.targetsize = sizeof(struct xt_connmark_target_info),
|
2006-09-20 19:06:40 +00:00
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
.compatsize = sizeof(struct compat_xt_connmark_target_info),
|
|
|
|
.compat_from_user = compat_from_user,
|
|
|
|
.compat_to_user = compat_to_user,
|
|
|
|
#endif
|
2006-08-22 07:34:04 +00:00
|
|
|
.me = THIS_MODULE
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.name = "CONNMARK",
|
|
|
|
.family = AF_INET6,
|
|
|
|
.checkentry = checkentry,
|
2006-12-12 08:29:02 +00:00
|
|
|
.destroy = destroy,
|
2006-08-22 07:34:04 +00:00
|
|
|
.target = target,
|
|
|
|
.targetsize = sizeof(struct xt_connmark_target_info),
|
|
|
|
.me = THIS_MODULE
|
|
|
|
},
|
2005-04-16 22:20:36 +00:00
|
|
|
};
|
|
|
|
|
2006-03-29 00:37:06 +00:00
|
|
|
static int __init xt_connmark_init(void)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2006-08-22 07:34:04 +00:00
|
|
|
return xt_register_targets(xt_connmark_target,
|
|
|
|
ARRAY_SIZE(xt_connmark_target));
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2006-03-29 00:37:06 +00:00
|
|
|
static void __exit xt_connmark_fini(void)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2006-08-22 07:34:04 +00:00
|
|
|
xt_unregister_targets(xt_connmark_target,
|
|
|
|
ARRAY_SIZE(xt_connmark_target));
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2006-03-29 00:37:06 +00:00
|
|
|
module_init(xt_connmark_init);
|
|
|
|
module_exit(xt_connmark_fini);
|