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1 | /* Xtables module to match packets using a BPF filter. |
2 | * Copyright 2013 Google Inc. |
3 | * Written by Willem de Bruijn <willemb@google.com> |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License version 2 as |
7 | * published by the Free Software Foundation. |
8 | */ |
9 | |
10 | #include <linux/module.h> |
11 | #include <linux/skbuff.h> |
12 | #include <linux/filter.h> |
13 | |
14 | #include <linux/netfilter/xt_bpf.h> |
15 | #include <linux/netfilter/x_tables.h> |
16 | |
17 | MODULE_AUTHOR("Willem de Bruijn <willemb@google.com>"); |
18 | MODULE_DESCRIPTION("Xtables: BPF filter match"); |
19 | MODULE_LICENSE("GPL"); |
20 | MODULE_ALIAS("ipt_bpf"); |
21 | MODULE_ALIAS("ip6t_bpf"); |
22 | |
23 | static int bpf_mt_check(const struct xt_mtchk_param *par) |
24 | { |
25 | struct xt_bpf_info *info = par->matchinfo; |
26 | struct sock_fprog program; |
27 | |
28 | program.len = info->bpf_program_num_elem; |
29 | program.filter = (struct sock_filter __user *) info->bpf_program; |
30 | if (sk_unattached_filter_create(&info->filter, &program)) { |
31 | pr_info("bpf: check failed: parse error\n"); |
32 | return -EINVAL; |
33 | } |
34 | |
35 | return 0; |
36 | } |
37 | |
38 | static bool bpf_mt(const struct sk_buff *skb, struct xt_action_param *par) |
39 | { |
40 | const struct xt_bpf_info *info = par->matchinfo; |
41 | |
42 | return SK_RUN_FILTER(info->filter, skb); |
43 | } |
44 | |
45 | static void bpf_mt_destroy(const struct xt_mtdtor_param *par) |
46 | { |
47 | const struct xt_bpf_info *info = par->matchinfo; |
48 | sk_unattached_filter_destroy(info->filter); |
49 | } |
50 | |
51 | static struct xt_match bpf_mt_reg __read_mostly = { |
52 | .name = "bpf", |
53 | .revision = 0, |
54 | .family = NFPROTO_UNSPEC, |
55 | .checkentry = bpf_mt_check, |
56 | .match = bpf_mt, |
57 | .destroy = bpf_mt_destroy, |
58 | .matchsize = sizeof(struct xt_bpf_info), |
59 | .me = THIS_MODULE, |
60 | }; |
61 | |
62 | static int __init bpf_mt_init(void) |
63 | { |
64 | return xt_register_match(&bpf_mt_reg); |
65 | } |
66 | |
67 | static void __exit bpf_mt_exit(void) |
68 | { |
69 | xt_unregister_match(&bpf_mt_reg); |
70 | } |
71 | |
72 | module_init(bpf_mt_init); |
73 | module_exit(bpf_mt_exit); |
74 |
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