netfilter: Combine ipt_ttl and ip6t_hl source

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>

net/ipv4/netfilter/Kconfig

@@ -92,15 +92,6 @@ config IP_NF_MATCH_ECN
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
-config IP_NF_MATCH_TTL
-	tristate '"ttl" match support'
-	depends on NETFILTER_ADVANCED
-	help
-	  This adds CONFIG_IP_NF_MATCH_TTL option, which enabled the user
-	  to match packets by their TTL value.
-
-	  To compile it as a module, choose M here.  If unsure, say N.
-
 # `filter', generic and specific targets
 config IP_NF_FILTER
 	tristate "Packet filtering"

net/ipv4/netfilter/Makefile

@@ -51,7 +51,6 @@ obj-$(CONFIG_IP_NF_SECURITY) += iptable_security.o
 obj-$(CONFIG_IP_NF_MATCH_ADDRTYPE) += ipt_addrtype.o
 obj-$(CONFIG_IP_NF_MATCH_AH) += ipt_ah.o
 obj-$(CONFIG_IP_NF_MATCH_ECN) += ipt_ecn.o
-obj-$(CONFIG_IP_NF_MATCH_TTL) += ipt_ttl.o
 
 # targets
 obj-$(CONFIG_IP_NF_TARGET_CLUSTERIP) += ipt_CLUSTERIP.o

net/ipv4/netfilter/ipt_ttl.c

-/* IP tables module for matching the value of the TTL
- *
- * (C) 2000,2001 by Harald Welte <laforge@netfilter.org>
- *
- * 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/ip.h>
-#include <linux/module.h>
-#include <linux/skbuff.h>
-
-#include <linux/netfilter_ipv4/ipt_ttl.h>
-#include <linux/netfilter/x_tables.h>
-
-MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
-MODULE_DESCRIPTION("Xtables: IPv4 TTL field match");
-MODULE_LICENSE("GPL");
-
-static bool ttl_mt(const struct sk_buff *skb, const struct xt_match_param *par)
-{
-	const struct ipt_ttl_info *info = par->matchinfo;
-	const u8 ttl = ip_hdr(skb)->ttl;
-
-	switch (info->mode) {
-		case IPT_TTL_EQ:
-			return ttl == info->ttl;
-		case IPT_TTL_NE:
-			return ttl != info->ttl;
-		case IPT_TTL_LT:
-			return ttl < info->ttl;
-		case IPT_TTL_GT:
-			return ttl > info->ttl;
-		default:
-			printk(KERN_WARNING "ipt_ttl: unknown mode %d\n",
-				info->mode);
-			return false;
-	}
-
-	return false;
-}
-
-static struct xt_match ttl_mt_reg __read_mostly = {
-	.name		= "ttl",
-	.family		= NFPROTO_IPV4,
-	.match		= ttl_mt,
-	.matchsize	= sizeof(struct ipt_ttl_info),
-	.me		= THIS_MODULE,
-};
-
-static int __init ttl_mt_init(void)
-{
-	return xt_register_match(&ttl_mt_reg);
-}
-
-static void __exit ttl_mt_exit(void)
-{
-	xt_unregister_match(&ttl_mt_reg);
-}
-
-module_init(ttl_mt_init);
-module_exit(ttl_mt_exit);

net/ipv6/netfilter/Kconfig

@@ -94,15 +94,6 @@ config IP6_NF_MATCH_OPTS
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
-config IP6_NF_MATCH_HL
-	tristate '"hl" match support'
-	depends on NETFILTER_ADVANCED
-	help
-	  HL matching allows you to match packets based on the hop
-	  limit of the packet.
-
-	  To compile it as a module, choose M here.  If unsure, say N.
-
 config IP6_NF_MATCH_IPV6HEADER
 	tristate '"ipv6header" IPv6 Extension Headers Match'
 	default m if NETFILTER_ADVANCED=n

net/ipv6/netfilter/Makefile

@@ -20,7 +20,6 @@ obj-$(CONFIG_NF_CONNTRACK_IPV6) += nf_conntrack_ipv6.o
 obj-$(CONFIG_IP6_NF_MATCH_AH) += ip6t_ah.o
 obj-$(CONFIG_IP6_NF_MATCH_EUI64) += ip6t_eui64.o
 obj-$(CONFIG_IP6_NF_MATCH_FRAG) += ip6t_frag.o
-obj-$(CONFIG_IP6_NF_MATCH_HL) += ip6t_hl.o
 obj-$(CONFIG_IP6_NF_MATCH_IPV6HEADER) += ip6t_ipv6header.o
 obj-$(CONFIG_IP6_NF_MATCH_MH) += ip6t_mh.o
 obj-$(CONFIG_IP6_NF_MATCH_OPTS) += ip6t_hbh.o

net/netfilter/Kconfig

@@ -620,6 +620,14 @@ config NETFILTER_XT_MATCH_HELPER
 
 	  To compile it as a module, choose M here.  If unsure, say Y.
 
+config NETFILTER_XT_MATCH_HL
+	tristate '"hl" hoplimit/TTL match support'
+	depends on NETFILTER_ADVANCED
+	---help---
+	HL matching allows you to match packets based on the hoplimit
+	in the IPv6 header, or the time-to-live field in the IPv4
+	header of the packet.
+
 config NETFILTER_XT_MATCH_IPRANGE
 	tristate '"iprange" address range match support'
 	depends on NETFILTER_ADVANCED

net/netfilter/Makefile

@@ -68,6 +68,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_DSCP) += xt_dscp.o
 obj-$(CONFIG_NETFILTER_XT_MATCH_ESP) += xt_esp.o
 obj-$(CONFIG_NETFILTER_XT_MATCH_HASHLIMIT) += xt_hashlimit.o
 obj-$(CONFIG_NETFILTER_XT_MATCH_HELPER) += xt_helper.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_HL) += xt_hl.o
 obj-$(CONFIG_NETFILTER_XT_MATCH_IPRANGE) += xt_iprange.o
 obj-$(CONFIG_NETFILTER_XT_MATCH_LENGTH) += xt_length.o
 obj-$(CONFIG_NETFILTER_XT_MATCH_LIMIT) += xt_limit.o

net/ipv6/netfilter/ip6t_hl.c → net/netfilter/xt_hl.c

-/* Hop Limit matching module */
-
-/* (C) 2001-2002 Maciej Soltysiak <solt@dns.toxicfilms.tv>
- * Based on HW's ttl module
+/*
+ * IP tables module for matching the value of the TTL
+ * (C) 2000,2001 by Harald Welte <laforge@netfilter.org>
+ *
+ * Hop Limit matching module
+ * (C) 2001-2002 Maciej Soltysiak <solt@dns.toxicfilms.tv>
  *
  * 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/ip.h>
 #include <linux/ipv6.h>
 #include <linux/module.h>
 #include <linux/skbuff.h>
 
-#include <linux/netfilter_ipv6/ip6t_hl.h>
 #include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_ipv4/ipt_ttl.h>
+#include <linux/netfilter_ipv6/ip6t_hl.h>
 
 MODULE_AUTHOR("Maciej Soltysiak <solt@dns.toxicfilms.tv>");
-MODULE_DESCRIPTION("Xtables: IPv6 Hop Limit field match");
+MODULE_DESCRIPTION("Xtables: Hoplimit/TTL field match");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_ttl");
+MODULE_ALIAS("ip6t_hl");
+
+static bool ttl_mt(const struct sk_buff *skb, const struct xt_match_param *par)
+{
+	const struct ipt_ttl_info *info = par->matchinfo;
+	const u8 ttl = ip_hdr(skb)->ttl;
+
+	switch (info->mode) {
+		case IPT_TTL_EQ:
+			return ttl == info->ttl;
+		case IPT_TTL_NE:
+			return ttl != info->ttl;
+		case IPT_TTL_LT:
+			return ttl < info->ttl;
+		case IPT_TTL_GT:
+			return ttl > info->ttl;
+		default:
+			printk(KERN_WARNING "ipt_ttl: unknown mode %d\n",
+				info->mode);
+			return false;
+	}
+
+	return false;
+}
 
 static bool hl_mt6(const struct sk_buff *skb, const struct xt_match_param *par)
 {
@@ -46,23 +75,34 @@ static bool hl_mt6(const struct sk_buff *skb, const struct xt_match_param *par)
 	return false;
 }
 
-static struct xt_match hl_mt6_reg __read_mostly = {
+static struct xt_match hl_mt_reg[] __read_mostly = {
+	{
+		.name       = "ttl",
+		.revision   = 0,
+		.family     = NFPROTO_IPV4,
+		.match      = ttl_mt,
+		.matchsize  = sizeof(struct ipt_ttl_info),
+		.me         = THIS_MODULE,
+	},
+	{
 		.name       = "hl",
+		.revision   = 0,
 		.family     = NFPROTO_IPV6,
 		.match      = hl_mt6,
 		.matchsize  = sizeof(struct ip6t_hl_info),
 		.me         = THIS_MODULE,
+	},
 };
 
-static int __init hl_mt6_init(void)
+static int __init hl_mt_init(void)
 {
-	return xt_register_match(&hl_mt6_reg);
+	return xt_register_matches(hl_mt_reg, ARRAY_SIZE(hl_mt_reg));
 }
 
-static void __exit hl_mt6_exit(void)
+static void __exit hl_mt_exit(void)
 {
-	xt_unregister_match(&hl_mt6_reg);
+	xt_unregister_matches(hl_mt_reg, ARRAY_SIZE(hl_mt_reg));
 }
 
-module_init(hl_mt6_init);
-module_exit(hl_mt6_exit);
+module_init(hl_mt_init);
+module_exit(hl_mt_exit);