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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
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2 | /* |
3 | * Copyright (c) 2011 Patrick McHardy <kaber@trash.net> | |
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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 | ||
13 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
14 | MODULE_LICENSE("GPL"); | |
15 | MODULE_DESCRIPTION("Xtables: Device group match"); | |
16 | MODULE_ALIAS("ipt_devgroup"); | |
17 | MODULE_ALIAS("ip6t_devgroup"); | |
18 | ||
19 | static 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 && | |
613dbd95 | 24 | (((info->src_group ^ xt_in(par)->group) & info->src_mask ? 1 : 0) ^ |
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25 | ((info->flags & XT_DEVGROUP_INVERT_SRC) ? 1 : 0))) |
26 | return false; | |
27 | ||
28 | if (info->flags & XT_DEVGROUP_MATCH_DST && | |
613dbd95 | 29 | (((info->dst_group ^ xt_out(par)->group) & info->dst_mask ? 1 : 0) ^ |
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30 | ((info->flags & XT_DEVGROUP_INVERT_DST) ? 1 : 0))) |
31 | return false; | |
32 | ||
33 | return true; | |
34 | } | |
35 | ||
36 | static 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 | ||
59 | static 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 | ||
68 | static int __init devgroup_mt_init(void) | |
69 | { | |
70 | return xt_register_match(&devgroup_mt_reg); | |
71 | } | |
72 | ||
73 | static void __exit devgroup_mt_exit(void) | |
74 | { | |
75 | xt_unregister_match(&devgroup_mt_reg); | |
76 | } | |
77 | ||
78 | module_init(devgroup_mt_init); | |
79 | module_exit(devgroup_mt_exit); |