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1 | /* String matching match for iptables |
2 | * |
3 | * (C) 2005 Pablo Neira Ayuso <pablo@eurodev.net> |
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/gfp.h> |
11 | #include <linux/init.h> |
12 | #include <linux/module.h> |
13 | #include <linux/kernel.h> |
14 | #include <linux/skbuff.h> |
15 | #include <linux/netfilter/x_tables.h> |
16 | #include <linux/netfilter/xt_string.h> |
17 | #include <linux/textsearch.h> |
18 | |
19 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@eurodev.net>"); |
20 | MODULE_DESCRIPTION("Xtables: string-based matching"); |
21 | MODULE_LICENSE("GPL"); |
22 | MODULE_ALIAS("ipt_string"); |
23 | MODULE_ALIAS("ip6t_string"); |
24 | |
25 | static bool |
26 | string_mt(const struct sk_buff *skb, struct xt_action_param *par) |
27 | { |
28 | const struct xt_string_info *conf = par->matchinfo; |
29 | struct ts_state state; |
30 | bool invert; |
31 | |
32 | memset(&state, 0, sizeof(struct ts_state)); |
33 | invert = conf->u.v1.flags & XT_STRING_FLAG_INVERT; |
34 | |
35 | return (skb_find_text((struct sk_buff *)skb, conf->from_offset, |
36 | conf->to_offset, conf->config, &state) |
37 | != UINT_MAX) ^ invert; |
38 | } |
39 | |
40 | #define STRING_TEXT_PRIV(m) ((struct xt_string_info *)(m)) |
41 | |
42 | static int string_mt_check(const struct xt_mtchk_param *par) |
43 | { |
44 | struct xt_string_info *conf = par->matchinfo; |
45 | struct ts_config *ts_conf; |
46 | int flags = TS_AUTOLOAD; |
47 | |
48 | /* Damn, can't handle this case properly with iptables... */ |
49 | if (conf->from_offset > conf->to_offset) |
50 | return -EINVAL; |
51 | if (conf->algo[XT_STRING_MAX_ALGO_NAME_SIZE - 1] != '\0') |
52 | return -EINVAL; |
53 | if (conf->patlen > XT_STRING_MAX_PATTERN_SIZE) |
54 | return -EINVAL; |
55 | if (conf->u.v1.flags & |
56 | ~(XT_STRING_FLAG_IGNORECASE | XT_STRING_FLAG_INVERT)) |
57 | return -EINVAL; |
58 | if (conf->u.v1.flags & XT_STRING_FLAG_IGNORECASE) |
59 | flags |= TS_IGNORECASE; |
60 | ts_conf = textsearch_prepare(conf->algo, conf->pattern, conf->patlen, |
61 | GFP_KERNEL, flags); |
62 | if (IS_ERR(ts_conf)) |
63 | return PTR_ERR(ts_conf); |
64 | |
65 | conf->config = ts_conf; |
66 | return 0; |
67 | } |
68 | |
69 | static void string_mt_destroy(const struct xt_mtdtor_param *par) |
70 | { |
71 | textsearch_destroy(STRING_TEXT_PRIV(par->matchinfo)->config); |
72 | } |
73 | |
74 | static struct xt_match xt_string_mt_reg __read_mostly = { |
75 | .name = "string", |
76 | .revision = 1, |
77 | .family = NFPROTO_UNSPEC, |
78 | .checkentry = string_mt_check, |
79 | .match = string_mt, |
80 | .destroy = string_mt_destroy, |
81 | .matchsize = sizeof(struct xt_string_info), |
82 | .me = THIS_MODULE, |
83 | }; |
84 | |
85 | static int __init string_mt_init(void) |
86 | { |
87 | return xt_register_match(&xt_string_mt_reg); |
88 | } |
89 | |
90 | static void __exit string_mt_exit(void) |
91 | { |
92 | xt_unregister_match(&xt_string_mt_reg); |
93 | } |
94 | |
95 | module_init(string_mt_init); |
96 | module_exit(string_mt_exit); |
97 |
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