[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables

This monster-patch tries to do the best job for unifying the data
structures and backend interfaces for the three evil clones ip_tables,
ip6_tables and arp_tables.  In an ideal world we would never have
allowed this kind of copy+paste programming... but well, our world
isn't (yet?) ideal.

o introduce a new x_tables module
o {ip,arp,ip6}_tables depend on this x_tables module
o registration functions for tables, matches and targets are only
  wrappers around x_tables provided functions
o all matches/targets that are used from ip_tables and ip6_tables
  are now implemented as xt_FOOBAR.c files and provide module aliases
  to ipt_FOOBAR and ip6t_FOOBAR
o header files for xt_matches are in include/linux/netfilter/,
  include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers
  around the xt_FOOBAR.h headers

Based on this patchset we're going to further unify the code,
gradually getting rid of all the layer 3 specific assumptions.

Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

22 files changed, 155 insertions, 384 deletions

diff --git a/include/linux/netfilter_ipv4/ip_conntrack.h b/include/linux/netfilter_ipv4/ip_conntrack.h
index b3432ab59a1..215765f043e 100644
--- a/include/linux/netfilter_ipv4/ip_conntrack.h
+++ b/include/linux/netfilter_ipv4/ip_conntrack.h
@@ -199,9 +199,6 @@ ip_conntrack_put(struct ip_conntrack *ct)
 	nf_conntrack_put(&ct->ct_general);
 }
 
-/* call to create an explicit dependency on ip_conntrack. */
-extern void need_ip_conntrack(void);
-
 extern int invert_tuplepr(struct ip_conntrack_tuple *inverse,
 			  const struct ip_conntrack_tuple *orig);
 
diff --git a/include/linux/netfilter_ipv4/ip_tables.h b/include/linux/netfilter_ipv4/ip_tables.h
index d19d65cf453..76ba24b6851 100644
--- a/include/linux/netfilter_ipv4/ip_tables.h
+++ b/include/linux/netfilter_ipv4/ip_tables.h
@@ -25,8 +25,14 @@
 #include <linux/compiler.h>
 #include <linux/netfilter_ipv4.h>
 
-#define IPT_FUNCTION_MAXNAMELEN 30
-#define IPT_TABLE_MAXNAMELEN 32
+#include <linux/netfilter/x_tables.h>
+
+#define IPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
+#define IPT_TABLE_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
+#define ipt_match xt_match
+#define ipt_target xt_target
+#define ipt_table xt_table
+#define ipt_get_revision xt_get_revision
 
 /* Yes, Virginia, you have to zero the padding. */
 struct ipt_ip {
@@ -102,10 +108,7 @@ struct ipt_standard_target
 	int verdict;
 };
 
-struct ipt_counters
-{
-	u_int64_t pcnt, bcnt;			/* Packet and byte counters */
-};
+#define ipt_counters xt_counters
 
 /* Values for "flag" field in struct ipt_ip (general ip structure). */
 #define IPT_F_FRAG		0x01	/* Set if rule is a fragment rule */
@@ -119,7 +122,7 @@ struct ipt_counters
 #define IPT_INV_SRCIP		0x08	/* Invert the sense of SRC IP. */
 #define IPT_INV_DSTIP		0x10	/* Invert the sense of DST OP. */
 #define IPT_INV_FRAG		0x20	/* Invert the sense of FRAG. */
-#define IPT_INV_PROTO		0x40	/* Invert the sense of PROTO. */
+#define IPT_INV_PROTO		XT_INV_PROTO
 #define IPT_INV_MASK		0x7F	/* All possible flag bits mask. */
 
 /* This structure defines each of the firewall rules.  Consists of 3
@@ -141,7 +144,7 @@ struct ipt_entry
 	unsigned int comefrom;
 
 	/* Packet and byte counters. */
-	struct ipt_counters counters;
+	struct xt_counters counters;
 
 	/* The matches (if any), then the target. */
 	unsigned char elems[0];
@@ -151,54 +154,34 @@ struct ipt_entry
  * New IP firewall options for [gs]etsockopt at the RAW IP level.
  * Unlike BSD Linux inherits IP options so you don't have to use a raw
  * socket for this. Instead we check rights in the calls. */
-#define IPT_BASE_CTL		64	/* base for firewall socket options */
+#define IPT_BASE_CTL		XT_BASE_CTL
 
-#define IPT_SO_SET_REPLACE	(IPT_BASE_CTL)
-#define IPT_SO_SET_ADD_COUNTERS	(IPT_BASE_CTL + 1)
-#define IPT_SO_SET_MAX		IPT_SO_SET_ADD_COUNTERS
+#define IPT_SO_SET_REPLACE	XT_SO_SET_REPLACE
+#define IPT_SO_SET_ADD_COUNTERS	XT_SO_SET_ADD_COUNTERS
+#define IPT_SO_SET_MAX		XT_SO_SET_MAX
 
-#define IPT_SO_GET_INFO			(IPT_BASE_CTL)
-#define IPT_SO_GET_ENTRIES		(IPT_BASE_CTL + 1)
-#define IPT_SO_GET_REVISION_MATCH	(IPT_BASE_CTL + 2)
-#define IPT_SO_GET_REVISION_TARGET	(IPT_BASE_CTL + 3)
-#define IPT_SO_GET_MAX			IPT_SO_GET_REVISION_TARGET
+#define IPT_SO_GET_INFO			XT_SO_GET_INFO
+#define IPT_SO_GET_ENTRIES		XT_SO_GET_ENTRIES
+#define IPT_SO_GET_REVISION_MATCH	XT_SO_GET_REVISION_MATCH
+#define IPT_SO_GET_REVISION_TARGET	XT_SO_GET_REVISION_TARGET
+#define IPT_SO_GET_MAX			XT_SO_GET_REVISION_TARGET
 
-/* CONTINUE verdict for targets */
-#define IPT_CONTINUE 0xFFFFFFFF
+#define IPT_CONTINUE XT_CONTINUE
+#define IPT_RETURN XT_RETURN
 
-/* For standard target */
-#define IPT_RETURN (-NF_REPEAT - 1)
+#include <linux/netfilter/xt_tcpudp.h>
+#define ipt_udp xt_udp
+#define ipt_tcp xt_tcp
 
-/* TCP matching stuff */
-struct ipt_tcp
-{
-	u_int16_t spts[2];			/* Source port range. */
-	u_int16_t dpts[2];			/* Destination port range. */
-	u_int8_t option;			/* TCP Option iff non-zero*/
-	u_int8_t flg_mask;			/* TCP flags mask byte */
-	u_int8_t flg_cmp;			/* TCP flags compare byte */
-	u_int8_t invflags;			/* Inverse flags */
-};
-
-/* Values for "inv" field in struct ipt_tcp. */
-#define IPT_TCP_INV_SRCPT	0x01	/* Invert the sense of source ports. */
-#define IPT_TCP_INV_DSTPT	0x02	/* Invert the sense of dest ports. */
-#define IPT_TCP_INV_FLAGS	0x04	/* Invert the sense of TCP flags. */
-#define IPT_TCP_INV_OPTION	0x08	/* Invert the sense of option test. */
-#define IPT_TCP_INV_MASK	0x0F	/* All possible flags. */
-
-/* UDP matching stuff */
-struct ipt_udp
-{
-	u_int16_t spts[2];			/* Source port range. */
-	u_int16_t dpts[2];			/* Destination port range. */
-	u_int8_t invflags;			/* Inverse flags */
-};
+#define IPT_TCP_INV_SRCPT	XT_TCP_INV_SRCPT
+#define IPT_TCP_INV_DSTPT	XT_TCP_INV_DSTPT
+#define IPT_TCP_INV_FLAGS	XT_TCP_INV_FLAGS
+#define IPT_TCP_INV_OPTION	XT_TCP_INV_OPTION
+#define IPT_TCP_INV_MASK	XT_TCP_INV_MASK
 
-/* Values for "invflags" field in struct ipt_udp. */
-#define IPT_UDP_INV_SRCPT	0x01	/* Invert the sense of source ports. */
-#define IPT_UDP_INV_DSTPT	0x02	/* Invert the sense of dest ports. */
-#define IPT_UDP_INV_MASK	0x03	/* All possible flags. */
+#define IPT_UDP_INV_SRCPT	XT_UDP_INV_SRCPT
+#define IPT_UDP_INV_DSTPT	XT_UDP_INV_DSTPT
+#define IPT_UDP_INV_MASK	XT_UDP_INV_MASK
 
 /* ICMP matching stuff */
 struct ipt_icmp
@@ -260,23 +243,14 @@ struct ipt_replace
 	/* Number of counters (must be equal to current number of entries). */
 	unsigned int num_counters;
 	/* The old entries' counters. */
-	struct ipt_counters __user *counters;
+	struct xt_counters __user *counters;
 
 	/* The entries (hang off end: not really an array). */
 	struct ipt_entry entries[0];
 };
 
 /* The argument to IPT_SO_ADD_COUNTERS. */
-struct ipt_counters_info
-{
-	/* Which table. */
-	char name[IPT_TABLE_MAXNAMELEN];
-
-	unsigned int num_counters;
-
-	/* The counters (actually `number' of these). */
-	struct ipt_counters counters[0];
-};
+#define ipt_counters_info xt_counters_info
 
 /* The argument to IPT_SO_GET_ENTRIES. */
 struct ipt_get_entries
@@ -291,19 +265,10 @@ struct ipt_get_entries
 	struct ipt_entry entrytable[0];
 };
 
-/* The argument to IPT_SO_GET_REVISION_*.  Returns highest revision
- * kernel supports, if >= revision. */
-struct ipt_get_revision
-{
-	char name[IPT_FUNCTION_MAXNAMELEN-1];
-
-	u_int8_t revision;
-};
-
 /* Standard return verdict, or do jump. */
-#define IPT_STANDARD_TARGET ""
+#define IPT_STANDARD_TARGET XT_STANDARD_TARGET
 /* Error verdict. */
-#define IPT_ERROR_TARGET "ERROR"
+#define IPT_ERROR_TARGET XT_ERROR_TARGET
 
 /* Helper functions */
 static __inline__ struct ipt_entry_target *
@@ -356,103 +321,18 @@ ipt_get_target(struct ipt_entry *e)
 #include <linux/init.h>
 extern void ipt_init(void) __init;
 
-struct ipt_match
-{
-	struct list_head list;
-
-	const char name[IPT_FUNCTION_MAXNAMELEN-1];
-
-	u_int8_t revision;
-
-	/* Return true or false: return FALSE and set *hotdrop = 1 to
-           force immediate packet drop. */
-	/* Arguments changed since 2.4, as this must now handle
-           non-linear skbs, using skb_copy_bits and
-           skb_ip_make_writable. */
-	int (*match)(const struct sk_buff *skb,
-		     const struct net_device *in,
-		     const struct net_device *out,
-		     const void *matchinfo,
-		     int offset,
-		     int *hotdrop);
-
-	/* Called when user tries to insert an entry of this type. */
-	/* Should return true or false. */
-	int (*checkentry)(const char *tablename,
-			  const struct ipt_ip *ip,
-			  void *matchinfo,
-			  unsigned int matchinfosize,
-			  unsigned int hook_mask);
-
-	/* Called when entry of this type deleted. */
-	void (*destroy)(void *matchinfo, unsigned int matchinfosize);
-
-	/* Set this to THIS_MODULE. */
-	struct module *me;
-};
-
-/* Registration hooks for targets. */
-struct ipt_target
-{
-	struct list_head list;
-
-	const char name[IPT_FUNCTION_MAXNAMELEN-1];
-
-	u_int8_t revision;
-
-	/* Called when user tries to insert an entry of this type:
-           hook_mask is a bitmask of hooks from which it can be
-           called. */
-	/* Should return true or false. */
-	int (*checkentry)(const char *tablename,
-			  const struct ipt_entry *e,
-			  void *targinfo,
-			  unsigned int targinfosize,
-			  unsigned int hook_mask);
-
-	/* Called when entry of this type deleted. */
-	void (*destroy)(void *targinfo, unsigned int targinfosize);
-
-	/* Returns verdict.  Argument order changed since 2.4, as this
-           must now handle non-linear skbs, using skb_copy_bits and
-           skb_ip_make_writable. */
-	unsigned int (*target)(struct sk_buff **pskb,
-			       const struct net_device *in,
-			       const struct net_device *out,
-			       unsigned int hooknum,
-			       const void *targinfo,
-			       void *userdata);
-
-	/* Set this to THIS_MODULE. */
-	struct module *me;
-};
+#define ipt_register_target(tgt) xt_register_target(AF_INET, tgt)
+#define ipt_unregister_target(tgt) xt_unregister_target(AF_INET, tgt)
 
-extern int ipt_register_target(struct ipt_target *target);
-extern void ipt_unregister_target(struct ipt_target *target);
+#define ipt_register_match(mtch) xt_register_match(AF_INET, mtch)
+#define ipt_unregister_match(mtch) xt_unregister_match(AF_INET, mtch)
 
-extern int ipt_register_match(struct ipt_match *match);
-extern void ipt_unregister_match(struct ipt_match *match);
+//#define ipt_register_table(tbl, repl) xt_register_table(AF_INET, tbl, repl)
+//#define ipt_unregister_table(tbl) xt_unregister_table(AF_INET, tbl)
 
-/* Furniture shopping... */
-struct ipt_table
-{
-	struct list_head list;
-
-	/* A unique name... */
-	char name[IPT_TABLE_MAXNAMELEN];
-
-	/* What hooks you will enter on */
-	unsigned int valid_hooks;
-
-	/* Lock for the curtain */
-	rwlock_t lock;
-
-	/* Man behind the curtain... */
-	struct ipt_table_info *private;
-
-	/* Set to THIS_MODULE. */
-	struct module *me;
-};
+extern int ipt_register_table(struct ipt_table *table,
+			      const struct ipt_replace *repl);
+extern void ipt_unregister_table(struct ipt_table *table);
 
 /* net/sched/ipt.c: Gimme access to your targets!  Gets target->me. */
 extern struct ipt_target *ipt_find_target(const char *name, u8 revision);
@@ -476,9 +356,6 @@ struct ipt_error
 	struct ipt_error_target target;
 };
 
-extern int ipt_register_table(struct ipt_table *table,
-			      const struct ipt_replace *repl);
-extern void ipt_unregister_table(struct ipt_table *table);
 extern unsigned int ipt_do_table(struct sk_buff **pskb,
 				 unsigned int hook,
 				 const struct net_device *in,
@@ -486,6 +363,6 @@ extern unsigned int ipt_do_table(struct sk_buff **pskb,
 				 struct ipt_table *table,
 				 void *userdata);
 
-#define IPT_ALIGN(s) (((s) + (__alignof__(struct ipt_entry)-1)) & ~(__alignof__(struct ipt_entry)-1))
+#define IPT_ALIGN(s) XT_ALIGN(s)
 #endif /*__KERNEL__*/
 #endif /* _IPTABLES_H */
diff --git a/include/linux/netfilter_ipv4/ipt_CLASSIFY.h b/include/linux/netfilter_ipv4/ipt_CLASSIFY.h
index 7596e3dd00c..a46d511b5c3 100644
--- a/include/linux/netfilter_ipv4/ipt_CLASSIFY.h
+++ b/include/linux/netfilter_ipv4/ipt_CLASSIFY.h
@@ -1,8 +1,7 @@
 #ifndef _IPT_CLASSIFY_H
 #define _IPT_CLASSIFY_H
 
-struct ipt_classify_target_info {
-	u_int32_t priority;
-};
+#include <linux/netfilter/xt_CLASSIFY.h>
+#define ipt_classify_target_info xt_classify_target_info
 
 #endif /*_IPT_CLASSIFY_H */
diff --git a/include/linux/netfilter_ipv4/ipt_CONNMARK.h b/include/linux/netfilter_ipv4/ipt_CONNMARK.h
index d3c02536fc4..9ecfee0a9e3 100644
--- a/include/linux/netfilter_ipv4/ipt_CONNMARK.h
+++ b/include/linux/netfilter_ipv4/ipt_CONNMARK.h
@@ -9,17 +9,11 @@
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  */
+#include <linux/netfilter/xt_CONNMARK.h>
+#define IPT_CONNMARK_SET	XT_CONNMARK_SET
+#define IPT_CONNMARK_SAVE	XT_CONNMARK_SAVE
+#define	IPT_CONNMARK_RESTORE	XT_CONNMARK_RESTORE
 
-enum {
-	IPT_CONNMARK_SET = 0,
-	IPT_CONNMARK_SAVE,
-	IPT_CONNMARK_RESTORE
-};
-
-struct ipt_connmark_target_info {
-	unsigned long mark;
-	unsigned long mask;
-	u_int8_t mode;
-};
+#define ipt_connmark_target_info xt_connmark_target_info
 
 #endif /*_IPT_CONNMARK_H_target*/
diff --git a/include/linux/netfilter_ipv4/ipt_MARK.h b/include/linux/netfilter_ipv4/ipt_MARK.h
index f47485790ed..697a486a96d 100644
--- a/include/linux/netfilter_ipv4/ipt_MARK.h
+++ b/include/linux/netfilter_ipv4/ipt_MARK.h
@@ -1,20 +1,18 @@
 #ifndef _IPT_MARK_H_target
 #define _IPT_MARK_H_target
 
+/* Backwards compatibility for old userspace */
+
+#include <linux/netfilter/xt_MARK.h>
+
 /* Version 0 */
-struct ipt_mark_target_info {
-	unsigned long mark;
-};
+#define ipt_mark_target_info xt_mark_target_info
 
 /* Version 1 */
-enum {
-	IPT_MARK_SET=0,
-	IPT_MARK_AND,
-	IPT_MARK_OR
-};
+#define IPT_MARK_SET	XT_MARK_SET
+#define IPT_MARK_AND	XT_MARK_AND
+#define	IPT_MARK_OR	XT_MARK_OR
+
+#define ipt_mark_target_info_v1 xt_mark_target_info_v1
 
-struct ipt_mark_target_info_v1 {
-	unsigned long mark;
-	u_int8_t mode;
-};
 #endif /*_IPT_MARK_H_target*/
diff --git a/include/linux/netfilter_ipv4/ipt_NFQUEUE.h b/include/linux/netfilter_ipv4/ipt_NFQUEUE.h
index b5b2943b0c6..97a2a7557cb 100644
--- a/include/linux/netfilter_ipv4/ipt_NFQUEUE.h
+++ b/include/linux/netfilter_ipv4/ipt_NFQUEUE.h
@@ -8,9 +8,9 @@
 #ifndef _IPT_NFQ_TARGET_H
 #define _IPT_NFQ_TARGET_H
 
-/* target info */
-struct ipt_NFQ_info {
-	u_int16_t queuenum;
-};
+/* Backwards compatibility for old userspace */
+#include <linux/netfilter/xt_NFQUEUE.h>
+
+#define ipt_NFQ_info xt_NFQ_info
 
 #endif /* _IPT_DSCP_TARGET_H */
diff --git a/include/linux/netfilter_ipv4/ipt_comment.h b/include/linux/netfilter_ipv4/ipt_comment.h
index 85c1123c29c..ae2afc2f748 100644
--- a/include/linux/netfilter_ipv4/ipt_comment.h
+++ b/include/linux/netfilter_ipv4/ipt_comment.h
@@ -1,10 +1,10 @@
 #ifndef _IPT_COMMENT_H
 #define _IPT_COMMENT_H
 
-#define IPT_MAX_COMMENT_LEN 256
+#include <linux/netfilter/xt_comment.h>
 
-struct ipt_comment_info {
-	unsigned char comment[IPT_MAX_COMMENT_LEN];
-};
+#define IPT_MAX_COMMENT_LEN XT_MAX_COMMENT_LEN
+
+#define ipt_comment_info xt_comment_info
 
 #endif /* _IPT_COMMENT_H */
diff --git a/include/linux/netfilter_ipv4/ipt_connbytes.h b/include/linux/netfilter_ipv4/ipt_connbytes.h
index 9e5532f8d8a..b04dfa3083c 100644
--- a/include/linux/netfilter_ipv4/ipt_connbytes.h
+++ b/include/linux/netfilter_ipv4/ipt_connbytes.h
@@ -1,25 +1,18 @@
 #ifndef _IPT_CONNBYTES_H
 #define _IPT_CONNBYTES_H
 
-enum ipt_connbytes_what {
-	IPT_CONNBYTES_PKTS,
-	IPT_CONNBYTES_BYTES,
-	IPT_CONNBYTES_AVGPKT,
-};
+#include <net/netfilter/xt_connbytes.h>
+#define ipt_connbytes_what xt_connbytes_what
 
-enum ipt_connbytes_direction {
-	IPT_CONNBYTES_DIR_ORIGINAL,
-	IPT_CONNBYTES_DIR_REPLY,
-	IPT_CONNBYTES_DIR_BOTH,
-};
+#define IPT_CONNBYTES_PKTS	XT_CONNBYTES_PACKETS
+#define IPT_CONNBYTES_BYTES	XT_CONNBYTES_BYTES
+#define IPT_CONNBYTES_AVGPKT	XT_CONNBYTES_AVGPKT
+
+#define ipt_connbytes_direction 	xt_connbytes_direction
+#define IPT_CONNBYTES_DIR_ORIGINAL 	XT_CONNBYTES_DIR_ORIGINAL
+#define IPT_CONNBYTES_DIR_REPLY 	XT_CONNBYTES_DIR_REPLY
+#define IPT_CONNBYTES_DIR_BOTH		XT_CONNBYTES_DIR_BOTH
+
+#define ipt_connbytes_info xt_connbytes_info
 
-struct ipt_connbytes_info
-{
-	struct {
-		aligned_u64 from;	/* count to be matched */
-		aligned_u64 to;		/* count to be matched */
-	} count;
-	u_int8_t what;		/* ipt_connbytes_what */
-	u_int8_t direction;	/* ipt_connbytes_direction */
-};
 #endif
diff --git a/include/linux/netfilter_ipv4/ipt_connmark.h b/include/linux/netfilter_ipv4/ipt_connmark.h
index 46573270d9a..c7ba6560d44 100644
--- a/include/linux/netfilter_ipv4/ipt_connmark.h
+++ b/include/linux/netfilter_ipv4/ipt_connmark.h
@@ -1,18 +1,7 @@
 #ifndef _IPT_CONNMARK_H
 #define _IPT_CONNMARK_H
 
-/* Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
- * by Henrik Nordstrom <hno@marasystems.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- */
-
-struct ipt_connmark_info {
-	unsigned long mark, mask;
-	u_int8_t invert;
-};
+#include <linux/netfilter/xt_connmark.h>
+#define ipt_connmark_info xt_connmark_info
 
 #endif /*_IPT_CONNMARK_H*/
diff --git a/include/linux/netfilter_ipv4/ipt_conntrack.h b/include/linux/netfilter_ipv4/ipt_conntrack.h
index 413c5658bd3..cde6762949c 100644
--- a/include/linux/netfilter_ipv4/ipt_conntrack.h
+++ b/include/linux/netfilter_ipv4/ipt_conntrack.h
@@ -5,56 +5,24 @@
 #ifndef _IPT_CONNTRACK_H
 #define _IPT_CONNTRACK_H
 
-#define IPT_CONNTRACK_STATE_BIT(ctinfo) (1 << ((ctinfo)%IP_CT_IS_REPLY+1))
-#define IPT_CONNTRACK_STATE_INVALID (1 << 0)
+#include <linux/netfilter/xt_conntrack.h>
 
-#define IPT_CONNTRACK_STATE_SNAT (1 << (IP_CT_NUMBER + 1))
-#define IPT_CONNTRACK_STATE_DNAT (1 << (IP_CT_NUMBER + 2))
-#define IPT_CONNTRACK_STATE_UNTRACKED (1 << (IP_CT_NUMBER + 3))
+#define IPT_CONNTRACK_STATE_BIT(ctinfo) XT_CONNTRACK_STATE_BIT(ctinfo)
+#define IPT_CONNTRACK_STATE_INVALID 	XT_CONNTRACK_STATE_INVALID
 
-/* flags, invflags: */
-#define IPT_CONNTRACK_STATE	0x01
-#define IPT_CONNTRACK_PROTO	0x02
-#define IPT_CONNTRACK_ORIGSRC	0x04
-#define IPT_CONNTRACK_ORIGDST	0x08
-#define IPT_CONNTRACK_REPLSRC	0x10
-#define IPT_CONNTRACK_REPLDST	0x20
-#define IPT_CONNTRACK_STATUS	0x40
-#define IPT_CONNTRACK_EXPIRES	0x80
-
-/* This is exposed to userspace, so remains frozen in time. */
-struct ip_conntrack_old_tuple
-{
-	struct {
-		__u32 ip;
-		union {
-			__u16 all;
-		} u;
-	} src;
-
-	struct {
-		__u32 ip;
-		union {
-			__u16 all;
-		} u;
-
-		/* The protocol. */
-		u16 protonum;
-	} dst;
-};
+#define IPT_CONNTRACK_STATE_SNAT 	XT_CONNTRACK_STATE_SNAT
+#define IPT_CONNTRACK_STATE_DNAT	XT_CONNTRACK_STATE_DNAT
+#define IPT_CONNTRACK_STATE_UNTRACKED	XT_CONNTRACK_STATE_UNTRACKED
 
-struct ipt_conntrack_info
-{
-	unsigned int statemask, statusmask;
-
-	struct ip_conntrack_old_tuple tuple[IP_CT_DIR_MAX];
-	struct in_addr sipmsk[IP_CT_DIR_MAX], dipmsk[IP_CT_DIR_MAX];
-
-	unsigned long expires_min, expires_max;
-
-	/* Flags word */
-	u_int8_t flags;
-	/* Inverse flags */
-	u_int8_t invflags;
-};
+/* flags, invflags: */
+#define IPT_CONNTRACK_STATE		XT_CONNTRACK_STATE
+#define IPT_CONNTRACK_PROTO		XT_CONNTRACK_PROTO
+#define IPT_CONNTRACK_ORIGSRC		XT_CONNTRACK_ORIGSRC
+#define IPT_CONNTRACK_ORIGDST		XT_CONNTRACK_ORIGDST
+#define IPT_CONNTRACK_REPLSRC		XT_CONNTRACK_REPLSRC
+#define IPT_CONNTRACK_REPLDST		XT_CONNTRACK_REPLDST
+#define IPT_CONNTRACK_STATUS		XT_CONNTRACK_STATUS
+#define IPT_CONNTRACK_EXPIRES		XT_CONNTRACK_EXPIRES
+
+#define ipt_conntrack_info		xt_conntrack_info
 #endif /*_IPT_CONNTRACK_H*/
diff --git a/include/linux/netfilter_ipv4/ipt_dccp.h b/include/linux/netfilter_ipv4/ipt_dccp.h
index 3cb3a522e62..e70d11e1f53 100644
--- a/include/linux/netfilter_ipv4/ipt_dccp.h
+++ b/include/linux/netfilter_ipv4/ipt_dccp.h
@@ -1,23 +1,15 @@
 #ifndef _IPT_DCCP_H_
 #define _IPT_DCCP_H_
 
-#define IPT_DCCP_SRC_PORTS	        0x01
-#define IPT_DCCP_DEST_PORTS	        0x02
-#define IPT_DCCP_TYPE			0x04
-#define IPT_DCCP_OPTION			0x08
+#include <linux/netfilter/xt_dccp.h>
+#define IPT_DCCP_SRC_PORTS	XT_DCCP_SRC_PORTS
+#define IPT_DCCP_DEST_PORTS	XT_DCCP_DEST_PORTS
+#define IPT_DCCP_TYPE		XT_DCCP_TYPE
+#define IPT_DCCP_OPTION		XT_DCCP_OPTION
 
-#define IPT_DCCP_VALID_FLAGS		0x0f
+#define IPT_DCCP_VALID_FLAGS 	XT_DCCP_VALID_FLAGS
 
-struct ipt_dccp_info {
-	u_int16_t dpts[2];  /* Min, Max */
-	u_int16_t spts[2];  /* Min, Max */
-
-	u_int16_t flags;
-	u_int16_t invflags;
-
-	u_int16_t typemask;
-	u_int8_t option;
-};
+#define ipt_dccp_info xt_dccp_info
 
 #endif /* _IPT_DCCP_H_ */
 
diff --git a/include/linux/netfilter_ipv4/ipt_helper.h b/include/linux/netfilter_ipv4/ipt_helper.h
index 6f12ecb8c93..80452c21855 100644
--- a/include/linux/netfilter_ipv4/ipt_helper.h
+++ b/include/linux/netfilter_ipv4/ipt_helper.h
@@ -1,8 +1,7 @@
 #ifndef _IPT_HELPER_H
 #define _IPT_HELPER_H
 
-struct ipt_helper_info {
-	int invert;
-	char name[30];
-};
+#include <linux/netfilter/xt_helper.h>
+#define ipt_helper_info xt_helper_info
+
 #endif /* _IPT_HELPER_H */
diff --git a/include/linux/netfilter_ipv4/ipt_length.h b/include/linux/netfilter_ipv4/ipt_length.h
index 6e088522961..9b45206ffce 100644
--- a/include/linux/netfilter_ipv4/ipt_length.h
+++ b/include/linux/netfilter_ipv4/ipt_length.h
@@ -1,9 +1,7 @@
 #ifndef _IPT_LENGTH_H
 #define _IPT_LENGTH_H
 
-struct ipt_length_info {
-    u_int16_t	min, max;
-    u_int8_t	invert;
-};
+#include <linux/netfilter/xt_length.h>
+#define ipt_length_info xt_length_info
 
 #endif /*_IPT_LENGTH_H*/
diff --git a/include/linux/netfilter_ipv4/ipt_limit.h b/include/linux/netfilter_ipv4/ipt_limit.h
index 256453409e2..92f5cd07bbc 100644
--- a/include/linux/netfilter_ipv4/ipt_limit.h
+++ b/include/linux/netfilter_ipv4/ipt_limit.h
@@ -1,21 +1,8 @@
 #ifndef _IPT_RATE_H
 #define _IPT_RATE_H
 
-/* timings are in milliseconds. */
-#define IPT_LIMIT_SCALE 10000
+#include <linux/netfilter/xt_limit.h>
+#define IPT_LIMIT_SCALE XT_LIMIT_SCALE
+#define ipt_rateinfo xt_rateinfo
 
-/* 1/10,000 sec period => max of 10,000/sec.  Min rate is then 429490
-   seconds, or one every 59 hours. */
-struct ipt_rateinfo {
-	u_int32_t avg;    /* Average secs between packets * scale */
-	u_int32_t burst;  /* Period multiplier for upper limit. */
-
-	/* Used internally by the kernel */
-	unsigned long prev;
-	u_int32_t credit;
-	u_int32_t credit_cap, cost;
-
-	/* Ugly, ugly fucker. */
-	struct ipt_rateinfo *master;
-};
 #endif /*_IPT_RATE_H*/
diff --git a/include/linux/netfilter_ipv4/ipt_mac.h b/include/linux/netfilter_ipv4/ipt_mac.h
index f8d5b8e7ccd..b186008a3c4 100644
--- a/include/linux/netfilter_ipv4/ipt_mac.h
+++ b/include/linux/netfilter_ipv4/ipt_mac.h
@@ -1,8 +1,7 @@
 #ifndef _IPT_MAC_H
 #define _IPT_MAC_H
 
-struct ipt_mac_info {
-    unsigned char srcaddr[ETH_ALEN];
-    int invert;
-};
+#include <linux/netfilter/xt_mac.h>
+#define ipt_mac_info xt_mac_info
+
 #endif /*_IPT_MAC_H*/
diff --git a/include/linux/netfilter_ipv4/ipt_mark.h b/include/linux/netfilter_ipv4/ipt_mark.h
index f3952b563d4..bfde67c6122 100644
--- a/include/linux/netfilter_ipv4/ipt_mark.h
+++ b/include/linux/netfilter_ipv4/ipt_mark.h
@@ -1,9 +1,9 @@
 #ifndef _IPT_MARK_H
 #define _IPT_MARK_H
 
-struct ipt_mark_info {
-    unsigned long mark, mask;
-    u_int8_t invert;
-};
+/* Backwards compatibility for old userspace */
+#include <linux/netfilter/xt_mark.h>
+
+#define ipt_mark_info xt_mark_info
 
 #endif /*_IPT_MARK_H*/
diff --git a/include/linux/netfilter_ipv4/ipt_physdev.h b/include/linux/netfilter_ipv4/ipt_physdev.h
index 7538c8655ec..2400e7140f2 100644
--- a/include/linux/netfilter_ipv4/ipt_physdev.h
+++ b/include/linux/netfilter_ipv4/ipt_physdev.h
@@ -1,24 +1,17 @@
 #ifndef _IPT_PHYSDEV_H
 #define _IPT_PHYSDEV_H
 
-#ifdef __KERNEL__
-#include <linux/if.h>
-#endif
+/* Backwards compatibility for old userspace */
 
-#define IPT_PHYSDEV_OP_IN		0x01
-#define IPT_PHYSDEV_OP_OUT		0x02
-#define IPT_PHYSDEV_OP_BRIDGED		0x04
-#define IPT_PHYSDEV_OP_ISIN		0x08
-#define IPT_PHYSDEV_OP_ISOUT		0x10
-#define IPT_PHYSDEV_OP_MASK		(0x20 - 1)
+#include <linux/netfilter/xt_physdev.h>
 
-struct ipt_physdev_info {
-	char physindev[IFNAMSIZ];
-	char in_mask[IFNAMSIZ];
-	char physoutdev[IFNAMSIZ];
-	char out_mask[IFNAMSIZ];
-	u_int8_t invert;
-	u_int8_t bitmask;
-};
+#define IPT_PHYSDEV_OP_IN		XT_PHYSDEV_OP_IN
+#define IPT_PHYSDEV_OP_OUT		XT_PHYSDEV_OP_OUT
+#define IPT_PHYSDEV_OP_BRIDGED		XT_PHYSDEV_OP_BRIDGED
+#define IPT_PHYSDEV_OP_ISIN		XT_PHYSDEV_OP_ISIN
+#define IPT_PHYSDEV_OP_ISOUT		XT_PHYSDEV_OP_ISOUT
+#define IPT_PHYSDEV_OP_MASK		XT_PHYSDEV_OP_MASK
+
+#define ipt_physdev_info xt_physdev_info
 
 #endif /*_IPT_PHYSDEV_H*/
diff --git a/include/linux/netfilter_ipv4/ipt_pkttype.h b/include/linux/netfilter_ipv4/ipt_pkttype.h
index d53a6584868..ff1fbc949a0 100644
--- a/include/linux/netfilter_ipv4/ipt_pkttype.h
+++ b/include/linux/netfilter_ipv4/ipt_pkttype.h
@@ -1,8 +1,7 @@
 #ifndef _IPT_PKTTYPE_H
 #define _IPT_PKTTYPE_H
 
-struct ipt_pkttype_info {
-	int	pkttype;
-	int	invert;
-};
+#include <linux/netfilter/xt_pkttype.h>
+#define ipt_pkttype_info xt_pkttype_info
+
 #endif /*_IPT_PKTTYPE_H*/
diff --git a/include/linux/netfilter_ipv4/ipt_realm.h b/include/linux/netfilter_ipv4/ipt_realm.h
index a4d6698723a..b3996eaa018 100644
--- a/include/linux/netfilter_ipv4/ipt_realm.h
+++ b/include/linux/netfilter_ipv4/ipt_realm.h
@@ -1,10 +1,7 @@
 #ifndef _IPT_REALM_H
 #define _IPT_REALM_H
 
-struct ipt_realm_info {
-	u_int32_t id;
-	u_int32_t mask;
-	u_int8_t invert;
-};
+#include <linux/netfilter/xt_realm.h>
+#define ipt_realm_info xt_realm_info
 
 #endif /* _IPT_REALM_H */
diff --git a/include/linux/netfilter_ipv4/ipt_state.h b/include/linux/netfilter_ipv4/ipt_state.h
index 5df37868933..a44a99cc28c 100644
--- a/include/linux/netfilter_ipv4/ipt_state.h
+++ b/include/linux/netfilter_ipv4/ipt_state.h
@@ -1,13 +1,15 @@
 #ifndef _IPT_STATE_H
 #define _IPT_STATE_H
 
-#define IPT_STATE_BIT(ctinfo) (1 << ((ctinfo)%IP_CT_IS_REPLY+1))
-#define IPT_STATE_INVALID (1 << 0)
+/* Backwards compatibility for old userspace */
 
-#define IPT_STATE_UNTRACKED (1 << (IP_CT_NUMBER + 1))
+#include <linux/netfilter/xt_state.h>
+
+#define IPT_STATE_BIT		XT_STATE_BIT
+#define IPT_STATE_INVALID	XT_STATE_INVALID
+
+#define IPT_STATE_UNTRACKED	XT_STATE_UNTRACKED
+
+#define ipt_state_info		xt_state_info
 
-struct ipt_state_info
-{
-	unsigned int statemask;
-};
 #endif /*_IPT_STATE_H*/
diff --git a/include/linux/netfilter_ipv4/ipt_string.h b/include/linux/netfilter_ipv4/ipt_string.h
index a265f6e44ea..c26de305990 100644
--- a/include/linux/netfilter_ipv4/ipt_string.h
+++ b/include/linux/netfilter_ipv4/ipt_string.h
@@ -1,18 +1,10 @@
 #ifndef _IPT_STRING_H
 #define _IPT_STRING_H
 
-#define IPT_STRING_MAX_PATTERN_SIZE 128
-#define IPT_STRING_MAX_ALGO_NAME_SIZE 16
+#include <linux/netfilter/xt_string.h>
 
-struct ipt_string_info
-{
-	u_int16_t from_offset;
-	u_int16_t to_offset;
-	char	  algo[IPT_STRING_MAX_ALGO_NAME_SIZE];
-	char 	  pattern[IPT_STRING_MAX_PATTERN_SIZE];
-	u_int8_t  patlen;
-	u_int8_t  invert;
-	struct ts_config __attribute__((aligned(8))) *config;
-};
+#define IPT_STRING_MAX_PATTERN_SIZE XT_STRING_MAX_PATTERN_SIZE
+#define IPT_STRING_MAX_ALGO_NAME_SIZE XT_STRING_MAX_ALGO_NAME_SIZE
+#define ipt_string_info xt_string_info
 
 #endif /*_IPT_STRING_H*/
diff --git a/include/linux/netfilter_ipv4/ipt_tcpmss.h b/include/linux/netfilter_ipv4/ipt_tcpmss.h
index e2b14397f70..18bbc8e8e00 100644
--- a/include/linux/netfilter_ipv4/ipt_tcpmss.h
+++ b/include/linux/netfilter_ipv4/ipt_tcpmss.h
@@ -1,9 +1,7 @@
 #ifndef _IPT_TCPMSS_MATCH_H
 #define _IPT_TCPMSS_MATCH_H
 
-struct ipt_tcpmss_match_info {
-    u_int16_t mss_min, mss_max;
-    u_int8_t invert;
-};
+#include <linux/netfilter/xt_tcpmss.h>
+#define ipt_tcpmss_match_info xt_tcpmss_match_info
 
 #endif /*_IPT_TCPMSS_MATCH_H*/