NFS: Split fs/nfs/inode.c
[wrt350n-kernel.git] / net / netfilter / xt_string.c
blob79d9ea6964ba0a284de74cf2386ed89ab7a9a3da
1 /* String matching match for iptables
2 *
3 * (C) 2005 Pablo Neira Ayuso <pablo@eurodev.net>
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 */
10 #include <linux/init.h>
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/skbuff.h>
14 #include <linux/netfilter/x_tables.h>
15 #include <linux/netfilter/xt_string.h>
16 #include <linux/textsearch.h>
18 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@eurodev.net>");
19 MODULE_DESCRIPTION("IP tables string match module");
20 MODULE_LICENSE("GPL");
21 MODULE_ALIAS("ipt_string");
22 MODULE_ALIAS("ip6t_string");
24 static int match(const struct sk_buff *skb,
25 const struct net_device *in,
26 const struct net_device *out,
27 const struct xt_match *match,
28 const void *matchinfo,
29 int offset,
30 unsigned int protoff,
31 int *hotdrop)
33 struct ts_state state;
34 struct xt_string_info *conf = (struct xt_string_info *) matchinfo;
36 memset(&state, 0, sizeof(struct ts_state));
38 return (skb_find_text((struct sk_buff *)skb, conf->from_offset,
39 conf->to_offset, conf->config, &state)
40 != UINT_MAX) && !conf->invert;
43 #define STRING_TEXT_PRIV(m) ((struct xt_string_info *) m)
45 static int checkentry(const char *tablename,
46 const void *ip,
47 const struct xt_match *match,
48 void *matchinfo,
49 unsigned int matchsize,
50 unsigned int hook_mask)
52 struct xt_string_info *conf = matchinfo;
53 struct ts_config *ts_conf;
55 /* Damn, can't handle this case properly with iptables... */
56 if (conf->from_offset > conf->to_offset)
57 return 0;
59 ts_conf = textsearch_prepare(conf->algo, conf->pattern, conf->patlen,
60 GFP_KERNEL, TS_AUTOLOAD);
61 if (IS_ERR(ts_conf))
62 return 0;
64 conf->config = ts_conf;
66 return 1;
69 static void destroy(const struct xt_match *match, void *matchinfo,
70 unsigned int matchsize)
72 textsearch_destroy(STRING_TEXT_PRIV(matchinfo)->config);
75 static struct xt_match string_match = {
76 .name = "string",
77 .match = match,
78 .matchsize = sizeof(struct xt_string_info),
79 .checkentry = checkentry,
80 .destroy = destroy,
81 .family = AF_INET,
82 .me = THIS_MODULE
84 static struct xt_match string6_match = {
85 .name = "string",
86 .match = match,
87 .matchsize = sizeof(struct xt_string_info),
88 .checkentry = checkentry,
89 .destroy = destroy,
90 .family = AF_INET6,
91 .me = THIS_MODULE
94 static int __init xt_string_init(void)
96 int ret;
98 ret = xt_register_match(&string_match);
99 if (ret)
100 return ret;
101 ret = xt_register_match(&string6_match);
102 if (ret)
103 xt_unregister_match(&string_match);
105 return ret;
108 static void __exit xt_string_fini(void)
110 xt_unregister_match(&string_match);
111 xt_unregister_match(&string6_match);
114 module_init(xt_string_init);
115 module_exit(xt_string_fini);