[NETFILTER]: xt_mark match, revision 1

Introduces the xt_mark match revision 1. It uses fixed types,
eventually obsoleting revision 0 some day (uses nonfixed types).
Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/netfilter/xt_mark.h

@@ -6,4 +6,9 @@ struct xt_mark_info {
     u_int8_t invert;
 };
 
+struct xt_mark_mtinfo1 {
+	u_int32_t mark, mask;
+	u_int8_t invert;
+};
+
 #endif /*_XT_MARK_H*/

net/netfilter/xt_mark.c

-/* Kernel module to match NFMARK values. */
-
-/* (C) 1999-2001 Marc Boucher <marc@mbsi.ca>
+/*
+ *	xt_mark - Netfilter module to match NFMARK value
+ *
+ *	(C) 1999-2001 Marc Boucher <marc@mbsi.ca>
+ *	Copyright © CC Computer Consultants GmbH, 2007 - 2008
+ *	Jan Engelhardt <jengelh@computergmbh.de>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
+ *	This program is free software; you can redistribute it and/or modify
+ *	it under the terms of the GNU General Public License version 2 as
+ *	published by the Free Software Foundation.
  */
 
 #include <linux/module.h>
@@ -19,20 +22,31 @@ MODULE_DESCRIPTION("iptables mark matching module");
 MODULE_ALIAS("ipt_mark");
 MODULE_ALIAS("ip6t_mark");
 
+static bool
+mark_mt_v0(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_mark_info *info = matchinfo;
+
+	return ((skb->mark & info->mask) == info->mark) ^ info->invert;
+}
+
 static bool
 mark_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_mark_info *info = matchinfo;
+	const struct xt_mark_mtinfo1 *info = matchinfo;
 
 	return ((skb->mark & info->mask) == info->mark) ^ info->invert;
 }
 
 static bool
-mark_mt_check(const char *tablename, const void *entry,
-              const struct xt_match *match, void *matchinfo,
-              unsigned int hook_mask)
+mark_mt_check_v0(const char *tablename, const void *entry,
+                 const struct xt_match *match, void *matchinfo,
+                 unsigned int hook_mask)
 {
 	const struct xt_mark_info *minfo = matchinfo;
 
@@ -51,7 +65,7 @@ struct compat_xt_mark_info {
 	u_int16_t	__pad2;
 };
 
-static void mark_mt_compat_from_user(void *dst, void *src)
+static void mark_mt_compat_from_user_v0(void *dst, void *src)
 {
 	const struct compat_xt_mark_info *cm = src;
 	struct xt_mark_info m = {
@@ -62,7 +76,7 @@ static void mark_mt_compat_from_user(void *dst, void *src)
 	memcpy(dst, &m, sizeof(m));
 }
 
-static int mark_mt_compat_to_user(void __user *dst, void *src)
+static int mark_mt_compat_to_user_v0(void __user *dst, void *src)
 {
 	const struct xt_mark_info *m = src;
 	struct compat_xt_mark_info cm = {
@@ -77,30 +91,48 @@ static int mark_mt_compat_to_user(void __user *dst, void *src)
 static struct xt_match mark_mt_reg[] __read_mostly = {
 	{
 		.name		= "mark",
+		.revision	= 0,
 		.family		= AF_INET,
-		.checkentry	= mark_mt_check,
-		.match		= mark_mt,
+		.checkentry	= mark_mt_check_v0,
+		.match		= mark_mt_v0,
 		.matchsize	= sizeof(struct xt_mark_info),
 #ifdef CONFIG_COMPAT
 		.compatsize	= sizeof(struct compat_xt_mark_info),
-		.compat_from_user = mark_mt_compat_from_user,
-		.compat_to_user	= mark_mt_compat_to_user,
+		.compat_from_user = mark_mt_compat_from_user_v0,
+		.compat_to_user	= mark_mt_compat_to_user_v0,
 #endif
 		.me		= THIS_MODULE,
 	},
 	{
 		.name		= "mark",
+		.revision	= 0,
 		.family		= AF_INET6,
-		.checkentry	= mark_mt_check,
-		.match		= mark_mt,
+		.checkentry	= mark_mt_check_v0,
+		.match		= mark_mt_v0,
 		.matchsize	= sizeof(struct xt_mark_info),
 #ifdef CONFIG_COMPAT
 		.compatsize	= sizeof(struct compat_xt_mark_info),
-		.compat_from_user = mark_mt_compat_from_user,
-		.compat_to_user	= mark_mt_compat_to_user,
+		.compat_from_user = mark_mt_compat_from_user_v0,
+		.compat_to_user	= mark_mt_compat_to_user_v0,
 #endif
 		.me		= THIS_MODULE,
 	},
+	{
+		.name           = "mark",
+		.revision       = 1,
+		.family         = AF_INET,
+		.match          = mark_mt,
+		.matchsize      = sizeof(struct xt_mark_mtinfo1),
+		.me             = THIS_MODULE,
+	},
+	{
+		.name           = "mark",
+		.revision       = 1,
+		.family         = AF_INET6,
+		.match          = mark_mt,
+		.matchsize      = sizeof(struct xt_mark_mtinfo1),
+		.me             = THIS_MODULE,
+	},
 };
 
 static int __init mark_mt_init(void)