netfilter: xtables: add device group match

Add a new 'devgroup' match to match on the device group of the
incoming and outgoing network device of a packet.

Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Patrick McHardy 2011-02-03 00:05:43 +01:00
parent 5f52bc3cdd
commit 9291747f11
5 changed files with 114 additions and 0 deletions

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@ -37,6 +37,7 @@ header-y += xt_connmark.h
header-y += xt_conntrack.h
header-y += xt_cpu.h
header-y += xt_dccp.h
header-y += xt_devgroup.h
header-y += xt_dscp.h
header-y += xt_esp.h
header-y += xt_hashlimit.h

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@ -0,0 +1,21 @@
#ifndef _XT_DEVGROUP_H
#define _XT_DEVGROUP_H
#include <linux/types.h>
enum xt_devgroup_flags {
XT_DEVGROUP_MATCH_SRC = 0x1,
XT_DEVGROUP_INVERT_SRC = 0x2,
XT_DEVGROUP_MATCH_DST = 0x4,
XT_DEVGROUP_INVERT_DST = 0x8,
};
struct xt_devgroup_info {
__u32 flags;
__u32 src_group;
__u32 src_mask;
__u32 dst_group;
__u32 dst_mask;
};
#endif /* _XT_DEVGROUP_H */

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@ -738,6 +738,15 @@ config NETFILTER_XT_MATCH_DCCP
If you want to compile it as a module, say M here and read
<file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
config NETFILTER_XT_MATCH_DEVGROUP
tristate '"devgroup" match support'
depends on NETFILTER_ADVANCED
help
This options adds a `devgroup' match, which allows to match on the
device group a network device is assigned to.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_MATCH_DSCP
tristate '"dscp" and "tos" match support'
depends on NETFILTER_ADVANCED

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@ -77,6 +77,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_CONNLIMIT) += xt_connlimit.o
obj-$(CONFIG_NETFILTER_XT_MATCH_CONNTRACK) += xt_conntrack.o
obj-$(CONFIG_NETFILTER_XT_MATCH_CPU) += xt_cpu.o
obj-$(CONFIG_NETFILTER_XT_MATCH_DCCP) += xt_dccp.o
obj-$(CONFIG_NETFILTER_XT_MATCH_DEVGROUP) += xt_devgroup.o
obj-$(CONFIG_NETFILTER_XT_MATCH_DSCP) += xt_dscp.o
obj-$(CONFIG_NETFILTER_XT_MATCH_ESP) += xt_esp.o
obj-$(CONFIG_NETFILTER_XT_MATCH_HASHLIMIT) += xt_hashlimit.o

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@ -0,0 +1,82 @@
/*
* Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
*
* 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/netdevice.h>
#include <linux/netfilter/xt_devgroup.h>
#include <linux/netfilter/x_tables.h>
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Xtables: Device group match");
MODULE_ALIAS("ipt_devgroup");
MODULE_ALIAS("ip6t_devgroup");
static bool devgroup_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
const struct xt_devgroup_info *info = par->matchinfo;
if (info->flags & XT_DEVGROUP_MATCH_SRC &&
(((info->src_group ^ par->in->group) & info->src_mask ? 1 : 0) ^
((info->flags & XT_DEVGROUP_INVERT_SRC) ? 1 : 0)))
return false;
if (info->flags & XT_DEVGROUP_MATCH_DST &&
(((info->dst_group ^ par->out->group) & info->dst_mask ? 1 : 0) ^
((info->flags & XT_DEVGROUP_INVERT_DST) ? 1 : 0)))
return false;
return true;
}
static int devgroup_mt_checkentry(const struct xt_mtchk_param *par)
{
const struct xt_devgroup_info *info = par->matchinfo;
if (info->flags & ~(XT_DEVGROUP_MATCH_SRC | XT_DEVGROUP_INVERT_SRC |
XT_DEVGROUP_MATCH_DST | XT_DEVGROUP_INVERT_DST))
return -EINVAL;
if (info->flags & XT_DEVGROUP_MATCH_SRC &&
par->hook_mask & ~((1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_LOCAL_IN) |
(1 << NF_INET_FORWARD)))
return -EINVAL;
if (info->flags & XT_DEVGROUP_MATCH_DST &&
par->hook_mask & ~((1 << NF_INET_FORWARD) |
(1 << NF_INET_LOCAL_OUT) |
(1 << NF_INET_POST_ROUTING)))
return -EINVAL;
return 0;
}
static struct xt_match devgroup_mt_reg __read_mostly = {
.name = "devgroup",
.match = devgroup_mt,
.checkentry = devgroup_mt_checkentry,
.matchsize = sizeof(struct xt_devgroup_info),
.family = NFPROTO_UNSPEC,
.me = THIS_MODULE
};
static int __init devgroup_mt_init(void)
{
return xt_register_match(&devgroup_mt_reg);
}
static void __exit devgroup_mt_exit(void)
{
xt_unregister_match(&devgroup_mt_reg);
}
module_init(devgroup_mt_init);
module_exit(devgroup_mt_exit);