1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
 
 
 
 
 4 */
 5
 6#include <linux/module.h>
 7#include <linux/skbuff.h>
 8#include <linux/netdevice.h>
 9
10#include <linux/netfilter/xt_devgroup.h>
11#include <linux/netfilter/x_tables.h>
12
13MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
14MODULE_LICENSE("GPL");
15MODULE_DESCRIPTION("Xtables: Device group match");
16MODULE_ALIAS("ipt_devgroup");
17MODULE_ALIAS("ip6t_devgroup");
18
19static bool devgroup_mt(const struct sk_buff *skb, struct xt_action_param *par)
20{
21	const struct xt_devgroup_info *info = par->matchinfo;
22
23	if (info->flags & XT_DEVGROUP_MATCH_SRC &&
24	    (((info->src_group ^ xt_in(par)->group) & info->src_mask ? 1 : 0) ^
25	     ((info->flags & XT_DEVGROUP_INVERT_SRC) ? 1 : 0)))
26		return false;
27
28	if (info->flags & XT_DEVGROUP_MATCH_DST &&
29	    (((info->dst_group ^ xt_out(par)->group) & info->dst_mask ? 1 : 0) ^
30	     ((info->flags & XT_DEVGROUP_INVERT_DST) ? 1 : 0)))
31		return false;
32
33	return true;
34}
35
36static int devgroup_mt_checkentry(const struct xt_mtchk_param *par)
37{
38	const struct xt_devgroup_info *info = par->matchinfo;
39
40	if (info->flags & ~(XT_DEVGROUP_MATCH_SRC | XT_DEVGROUP_INVERT_SRC |
41			    XT_DEVGROUP_MATCH_DST | XT_DEVGROUP_INVERT_DST))
42		return -EINVAL;
43
44	if (info->flags & XT_DEVGROUP_MATCH_SRC &&
45	    par->hook_mask & ~((1 << NF_INET_PRE_ROUTING) |
46			       (1 << NF_INET_LOCAL_IN) |
47			       (1 << NF_INET_FORWARD)))
48		return -EINVAL;
49
50	if (info->flags & XT_DEVGROUP_MATCH_DST &&
51	    par->hook_mask & ~((1 << NF_INET_FORWARD) |
52			       (1 << NF_INET_LOCAL_OUT) |
53			       (1 << NF_INET_POST_ROUTING)))
54		return -EINVAL;
55
56	return 0;
57}
58
59static struct xt_match devgroup_mt_reg __read_mostly = {
60	.name		= "devgroup",
61	.match		= devgroup_mt,
62	.checkentry	= devgroup_mt_checkentry,
63	.matchsize	= sizeof(struct xt_devgroup_info),
64	.family		= NFPROTO_UNSPEC,
65	.me		= THIS_MODULE
66};
67
68static int __init devgroup_mt_init(void)
69{
70	return xt_register_match(&devgroup_mt_reg);
71}
72
73static void __exit devgroup_mt_exit(void)
74{
75	xt_unregister_match(&devgroup_mt_reg);
76}
77
78module_init(devgroup_mt_init);
79module_exit(devgroup_mt_exit);

 
 1/*
 2 * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
 3 *
 4 * This program is free software; you can redistribute it and/or modify
 5 * it under the terms of the GNU General Public License version 2 as
 6 * published by the Free Software Foundation.
 7 */
 8
 9#include <linux/module.h>
10#include <linux/skbuff.h>
11#include <linux/netdevice.h>
12
13#include <linux/netfilter/xt_devgroup.h>
14#include <linux/netfilter/x_tables.h>
15
16MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
17MODULE_LICENSE("GPL");
18MODULE_DESCRIPTION("Xtables: Device group match");
19MODULE_ALIAS("ipt_devgroup");
20MODULE_ALIAS("ip6t_devgroup");
21
22static bool devgroup_mt(const struct sk_buff *skb, struct xt_action_param *par)
23{
24	const struct xt_devgroup_info *info = par->matchinfo;
25
26	if (info->flags & XT_DEVGROUP_MATCH_SRC &&
27	    (((info->src_group ^ par->in->group) & info->src_mask ? 1 : 0) ^
28	     ((info->flags & XT_DEVGROUP_INVERT_SRC) ? 1 : 0)))
29		return false;
30
31	if (info->flags & XT_DEVGROUP_MATCH_DST &&
32	    (((info->dst_group ^ par->out->group) & info->dst_mask ? 1 : 0) ^
33	     ((info->flags & XT_DEVGROUP_INVERT_DST) ? 1 : 0)))
34		return false;
35
36	return true;
37}
38
39static int devgroup_mt_checkentry(const struct xt_mtchk_param *par)
40{
41	const struct xt_devgroup_info *info = par->matchinfo;
42
43	if (info->flags & ~(XT_DEVGROUP_MATCH_SRC | XT_DEVGROUP_INVERT_SRC |
44			    XT_DEVGROUP_MATCH_DST | XT_DEVGROUP_INVERT_DST))
45		return -EINVAL;
46
47	if (info->flags & XT_DEVGROUP_MATCH_SRC &&
48	    par->hook_mask & ~((1 << NF_INET_PRE_ROUTING) |
49			       (1 << NF_INET_LOCAL_IN) |
50			       (1 << NF_INET_FORWARD)))
51		return -EINVAL;
52
53	if (info->flags & XT_DEVGROUP_MATCH_DST &&
54	    par->hook_mask & ~((1 << NF_INET_FORWARD) |
55			       (1 << NF_INET_LOCAL_OUT) |
56			       (1 << NF_INET_POST_ROUTING)))
57		return -EINVAL;
58
59	return 0;
60}
61
62static struct xt_match devgroup_mt_reg __read_mostly = {
63	.name		= "devgroup",
64	.match		= devgroup_mt,
65	.checkentry	= devgroup_mt_checkentry,
66	.matchsize	= sizeof(struct xt_devgroup_info),
67	.family		= NFPROTO_UNSPEC,
68	.me		= THIS_MODULE
69};
70
71static int __init devgroup_mt_init(void)
72{
73	return xt_register_match(&devgroup_mt_reg);
74}
75
76static void __exit devgroup_mt_exit(void)
77{
78	xt_unregister_match(&devgroup_mt_reg);
79}
80
81module_init(devgroup_mt_init);
82module_exit(devgroup_mt_exit);