[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>

1 files changed, 17 insertions, 49 deletions

diff --git a/include/linux/netfilter_ipv4/ipt_conntrack.h b/include/linux/netfilter_ipv4/ipt_conntrack.h
index 413c5658bd3a..cde6762949c5 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*/