X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=net%2Fnetfilter%2Fxt_string.c;h=4903182a062b251a43ae583526889aefb770b264;hb=35ed4e75989c4e84a44b25569bbf09b98f923880;hp=275330fcdaaab9dfebba281e3baf5e80671c884c;hpb=78cc3b78c4208d28e7f4ecded82e238224ed4d1c;p=linux-2.6

diff --git a/net/netfilter/xt_string.c b/net/netfilter/xt_string.c
index 275330fcda..4903182a06 100644
--- a/net/netfilter/xt_string.c
+++ b/net/netfilter/xt_string.c
@@ -1,5 +1,5 @@
 /* String matching match for iptables
- * 
+ *
  * (C) 2005 Pablo Neira Ayuso <pablo@eurodev.net>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -16,103 +16,123 @@
 #include <linux/textsearch.h>
 
 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@eurodev.net>");
-MODULE_DESCRIPTION("IP tables string match module");
+MODULE_DESCRIPTION("Xtables: string-based matching");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("ipt_string");
 MODULE_ALIAS("ip6t_string");
 
-static int match(const struct sk_buff *skb,
-		 const struct net_device *in,
-		 const struct net_device *out,
-		 const struct xt_match *match,
-		 const void *matchinfo,
-		 int offset,
-		 unsigned int protoff,
-		 int *hotdrop)
+static bool
+string_mt(const struct sk_buff *skb, const struct net_device *in,
+          const struct net_device *out, const struct xt_match *match,
+          const void *matchinfo, int offset, unsigned int protoff,
+          bool *hotdrop)
 {
 	const struct xt_string_info *conf = matchinfo;
 	struct ts_state state;
+	int invert;
 
 	memset(&state, 0, sizeof(struct ts_state));
 
-	return (skb_find_text((struct sk_buff *)skb, conf->from_offset, 
-			     conf->to_offset, conf->config, &state) 
-			     != UINT_MAX) ^ conf->invert;
+	invert = (match->revision == 0 ? conf->u.v0.invert :
+				    conf->u.v1.flags & XT_STRING_FLAG_INVERT);
+
+	return (skb_find_text((struct sk_buff *)skb, conf->from_offset,
+			     conf->to_offset, conf->config, &state)
+			     != UINT_MAX) ^ invert;
 }
 
-#define STRING_TEXT_PRIV(m) ((struct xt_string_info *) m)
+#define STRING_TEXT_PRIV(m) ((struct xt_string_info *)(m))
 
-static int checkentry(const char *tablename,
-		      const void *ip,
-		      const struct xt_match *match,
-		      void *matchinfo,
-		      unsigned int matchsize,
-		      unsigned int hook_mask)
+static bool
+string_mt_check(const char *tablename, const void *ip,
+                const struct xt_match *match, void *matchinfo,
+                unsigned int hook_mask)
 {
 	struct xt_string_info *conf = matchinfo;
 	struct ts_config *ts_conf;
+	int flags = TS_AUTOLOAD;
 
 	/* Damn, can't handle this case properly with iptables... */
 	if (conf->from_offset > conf->to_offset)
-		return 0;
+		return false;
 	if (conf->algo[XT_STRING_MAX_ALGO_NAME_SIZE - 1] != '\0')
-	    	return 0;
+		return false;
 	if (conf->patlen > XT_STRING_MAX_PATTERN_SIZE)
-		return 0;
+		return false;
+	if (match->revision == 1) {
+		if (conf->u.v1.flags &
+		    ~(XT_STRING_FLAG_IGNORECASE | XT_STRING_FLAG_INVERT))
+			return false;
+		if (conf->u.v1.flags & XT_STRING_FLAG_IGNORECASE)
+			flags |= TS_IGNORECASE;
+	}
 	ts_conf = textsearch_prepare(conf->algo, conf->pattern, conf->patlen,
-				     GFP_KERNEL, TS_AUTOLOAD);
+				     GFP_KERNEL, flags);
 	if (IS_ERR(ts_conf))
-		return 0;
+		return false;
 
 	conf->config = ts_conf;
 
-	return 1;
+	return true;
 }
 
-static void destroy(const struct xt_match *match, void *matchinfo,
-		    unsigned int matchsize)
+static void string_mt_destroy(const struct xt_match *match, void *matchinfo)
 {
 	textsearch_destroy(STRING_TEXT_PRIV(matchinfo)->config);
 }
 
-static struct xt_match string_match = {
-	.name 		= "string",
-	.match 		= match,
-	.matchsize	= sizeof(struct xt_string_info),
-	.checkentry	= checkentry,
-	.destroy 	= destroy,
-	.family		= AF_INET,
-	.me 		= THIS_MODULE
-};
-static struct xt_match string6_match = {
-	.name 		= "string",
-	.match 		= match,
-	.matchsize	= sizeof(struct xt_string_info),
-	.checkentry	= checkentry,
-	.destroy 	= destroy,
-	.family		= AF_INET6,
-	.me 		= THIS_MODULE
+static struct xt_match string_mt_reg[] __read_mostly = {
+	{
+		.name 		= "string",
+		.revision	= 0,
+		.family		= AF_INET,
+		.checkentry	= string_mt_check,
+		.match 		= string_mt,
+		.destroy 	= string_mt_destroy,
+		.matchsize	= sizeof(struct xt_string_info),
+		.me 		= THIS_MODULE
+	},
+	{
+		.name 		= "string",
+		.revision	= 1,
+		.family		= AF_INET,
+		.checkentry	= string_mt_check,
+		.match 		= string_mt,
+		.destroy 	= string_mt_destroy,
+		.matchsize	= sizeof(struct xt_string_info),
+		.me 		= THIS_MODULE
+	},
+	{
+		.name 		= "string",
+		.revision	= 0,
+		.family		= AF_INET6,
+		.checkentry	= string_mt_check,
+		.match 		= string_mt,
+		.destroy 	= string_mt_destroy,
+		.matchsize	= sizeof(struct xt_string_info),
+		.me 		= THIS_MODULE
+	},
+	{
+		.name 		= "string",
+		.revision	= 1,
+		.family		= AF_INET6,
+		.checkentry	= string_mt_check,
+		.match 		= string_mt,
+		.destroy 	= string_mt_destroy,
+		.matchsize	= sizeof(struct xt_string_info),
+		.me 		= THIS_MODULE
+	},
 };
 
-static int __init xt_string_init(void)
+static int __init string_mt_init(void)
 {
-	int ret;
-
-	ret = xt_register_match(&string_match);
-	if (ret)
-		return ret;
-	ret = xt_register_match(&string6_match);
-	if (ret)
-		xt_unregister_match(&string_match);
-
-	return ret;
+	return xt_register_matches(string_mt_reg, ARRAY_SIZE(string_mt_reg));
 }
 
-static void __exit xt_string_fini(void)
+static void __exit string_mt_exit(void)
 {
-	xt_unregister_match(&string_match);
-	xt_unregister_match(&string6_match);
+	xt_unregister_matches(string_mt_reg, ARRAY_SIZE(string_mt_reg));
 }
 
-module_init(xt_string_init);
-module_exit(xt_string_fini);
+module_init(string_mt_init);
+module_exit(string_mt_exit);