netfilter: add protocol independent NAT core

Convert the IPv4 NAT implementation to a protocol independent core and
address family specific modules.
Signed-off-by: Patrick McHardy <kaber@trash.net>

include/linux/netfilter.h

@@ -342,7 +342,7 @@ extern int nf_register_afinfo(const struct nf_afinfo *afinfo);
 extern void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
 
 #include <net/flow.h>
-extern void (*ip_nat_decode_session)(struct sk_buff *, struct flowi *);
+extern void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *);
 
 static inline void
 nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
@@ -350,13 +350,11 @@ nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
 #ifdef CONFIG_NF_NAT_NEEDED
 	void (*decodefn)(struct sk_buff *, struct flowi *);
 
-	if (family == AF_INET) {
-		rcu_read_lock();
-		decodefn = rcu_dereference(ip_nat_decode_session);
-		if (decodefn)
-			decodefn(skb, fl);
-		rcu_read_unlock();
-	}
+	rcu_read_lock();
+	decodefn = rcu_dereference(nf_nat_decode_session_hook);
+	if (decodefn)
+		decodefn(skb, fl);
+	rcu_read_unlock();
 #endif
 }
 

include/linux/netfilter/nf_nat.h

@@ -22,4 +22,12 @@ struct nf_nat_ipv4_multi_range_compat {
 	struct nf_nat_ipv4_range	range[1];
 };
 
+struct nf_nat_range {
+	unsigned int			flags;
+	union nf_inet_addr		min_addr;
+	union nf_inet_addr		max_addr;
+	union nf_conntrack_man_proto	min_proto;
+	union nf_conntrack_man_proto	max_proto;
+};
+
 #endif /* _NETFILTER_NF_NAT_H */

include/linux/netfilter/nfnetlink_conntrack.h

@@ -142,8 +142,10 @@ enum ctattr_tstamp {
 
 enum ctattr_nat {
 	CTA_NAT_UNSPEC,
-	CTA_NAT_MINIP,
-	CTA_NAT_MAXIP,
+	CTA_NAT_V4_MINIP,
+#define CTA_NAT_MINIP CTA_NAT_V4_MINIP
+	CTA_NAT_V4_MAXIP,
+#define CTA_NAT_MAXIP CTA_NAT_V4_MAXIP
 	CTA_NAT_PROTO,
 	__CTA_NAT_MAX
 };

include/linux/netfilter_ipv4.h

@@ -79,7 +79,6 @@ enum nf_ip_hook_priorities {
 
 #ifdef __KERNEL__
 extern int ip_route_me_harder(struct sk_buff *skb, unsigned addr_type);
-extern int ip_xfrm_me_harder(struct sk_buff *skb);
 extern __sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
 				   unsigned int dataoff, u_int8_t protocol);
 #endif /*__KERNEL__*/

include/net/netfilter/nf_conntrack_expect.h

@@ -43,7 +43,7 @@ struct nf_conntrack_expect {
 	unsigned int class;
 
 #ifdef CONFIG_NF_NAT_NEEDED
-	__be32 saved_ip;
+	union nf_inet_addr saved_addr;
 	/* This is the original per-proto part, used to map the
 	 * expected connection the way the recipient expects. */
 	union nf_conntrack_man_proto saved_proto;

include/net/netfilter/nf_nat.h

@@ -50,7 +50,7 @@ struct nf_conn_nat {
 
 /* Set up the info structure to map into this range. */
 extern unsigned int nf_nat_setup_info(struct nf_conn *ct,
-				      const struct nf_nat_ipv4_range *range,
+				      const struct nf_nat_range *range,
 				      enum nf_nat_manip_type maniptype);
 
 /* Is this tuple already taken? (not by us)*/

include/net/netfilter/nf_nat_core.h

@@ -12,10 +12,7 @@ extern unsigned int nf_nat_packet(struct nf_conn *ct,
 				  unsigned int hooknum,
 				  struct sk_buff *skb);
 
-extern int nf_nat_icmp_reply_translation(struct nf_conn *ct,
-					 enum ip_conntrack_info ctinfo,
-					 unsigned int hooknum,
-					 struct sk_buff *skb);
+extern int nf_xfrm_me_harder(struct sk_buff *skb, unsigned int family);
 
 static inline int nf_nat_initialized(struct nf_conn *ct,
 				     enum nf_nat_manip_type manip)

include/net/netfilter/nf_nat_l3proto.h

+#ifndef _NF_NAT_L3PROTO_H
+#define _NF_NAT_L3PROTO_H
+
+struct nf_nat_l4proto;
+struct nf_nat_l3proto {
+	u8	l3proto;
+
+	bool	(*in_range)(const struct nf_conntrack_tuple *t,
+			    const struct nf_nat_range *range);
+
+	u32 	(*secure_port)(const struct nf_conntrack_tuple *t, __be16);
+
+	bool	(*manip_pkt)(struct sk_buff *skb,
+			     unsigned int iphdroff,
+			     const struct nf_nat_l4proto *l4proto,
+			     const struct nf_conntrack_tuple *target,
+			     enum nf_nat_manip_type maniptype);
+
+	void	(*csum_update)(struct sk_buff *skb, unsigned int iphdroff,
+			       __sum16 *check,
+			       const struct nf_conntrack_tuple *t,
+			       enum nf_nat_manip_type maniptype);
+
+	void	(*csum_recalc)(struct sk_buff *skb, u8 proto,
+			       void *data, __sum16 *check,
+			       int datalen, int oldlen);
+
+	void	(*decode_session)(struct sk_buff *skb,
+				  const struct nf_conn *ct,
+				  enum ip_conntrack_dir dir,
+				  unsigned long statusbit,
+				  struct flowi *fl);
+
+	int	(*nlattr_to_range)(struct nlattr *tb[],
+				   struct nf_nat_range *range);
+};
+
+extern int nf_nat_l3proto_register(const struct nf_nat_l3proto *);
+extern void nf_nat_l3proto_unregister(const struct nf_nat_l3proto *);
+extern const struct nf_nat_l3proto *__nf_nat_l3proto_find(u8 l3proto);
+
+extern int nf_nat_icmp_reply_translation(struct sk_buff *skb,
+					 struct nf_conn *ct,
+					 enum ip_conntrack_info ctinfo,
+					 unsigned int hooknum);
+
+#endif /* _NF_NAT_L3PROTO_H */

include/net/netfilter/nf_nat_protocol.h → include/net/netfilter/nf_nat_l4proto.h

 /* Header for use in defining a given protocol. */
-#ifndef _NF_NAT_PROTOCOL_H
-#define _NF_NAT_PROTOCOL_H
+#ifndef _NF_NAT_L4PROTO_H
+#define _NF_NAT_L4PROTO_H
 #include <net/netfilter/nf_nat.h>
 #include <linux/netfilter/nfnetlink_conntrack.h>
 
-struct nf_nat_ipv4_range;
+struct nf_nat_range;
+struct nf_nat_l3proto;
 
-struct nf_nat_protocol {
+struct nf_nat_l4proto {
 	/* Protocol number. */
-	unsigned int protonum;
+	u8 l4proto;
 
 	/* Translate a packet to the target according to manip type.
-	   Return true if succeeded. */
+	 * Return true if succeeded.
+	 */
 	bool (*manip_pkt)(struct sk_buff *skb,
-			  unsigned int iphdroff,
+			  const struct nf_nat_l3proto *l3proto,
+			  unsigned int iphdroff, unsigned int hdroff,
 			  const struct nf_conntrack_tuple *tuple,
 			  enum nf_nat_manip_type maniptype);
 
@@ -24,44 +27,45 @@ struct nf_nat_protocol {
 			 const union nf_conntrack_man_proto *max);
 
 	/* Alter the per-proto part of the tuple (depending on
-	   maniptype), to give a unique tuple in the given range if
-	   possible.  Per-protocol part of tuple is initialized to the
-	   incoming packet. */
-	void (*unique_tuple)(struct nf_conntrack_tuple *tuple,
-			     const struct nf_nat_ipv4_range *range,
+	 * maniptype), to give a unique tuple in the given range if
+	 * possible.  Per-protocol part of tuple is initialized to the
+	 * incoming packet.
+	 */
+	void (*unique_tuple)(const struct nf_nat_l3proto *l3proto,
+			     struct nf_conntrack_tuple *tuple,
+			     const struct nf_nat_range *range,
 			     enum nf_nat_manip_type maniptype,
 			     const struct nf_conn *ct);
 
 	int (*nlattr_to_range)(struct nlattr *tb[],
-			       struct nf_nat_ipv4_range *range);
+			       struct nf_nat_range *range);
 };
 
 /* Protocol registration. */
-extern int nf_nat_protocol_register(const struct nf_nat_protocol *proto);
-extern void nf_nat_protocol_unregister(const struct nf_nat_protocol *proto);
+extern int nf_nat_l4proto_register(u8 l3proto, const struct nf_nat_l4proto *l4proto);
+extern void nf_nat_l4proto_unregister(u8 l3proto, const struct nf_nat_l4proto *l4proto);
 
-/* Built-in protocols. */
-extern const struct nf_nat_protocol nf_nat_protocol_tcp;
-extern const struct nf_nat_protocol nf_nat_protocol_udp;
-extern const struct nf_nat_protocol nf_nat_protocol_icmp;
-extern const struct nf_nat_protocol nf_nat_unknown_protocol;
+extern const struct nf_nat_l4proto *__nf_nat_l4proto_find(u8 l3proto, u8 l4proto);
 
-extern int init_protocols(void) __init;
-extern void cleanup_protocols(void);
-extern const struct nf_nat_protocol *find_nat_proto(u_int16_t protonum);
+/* Built-in protocols. */
+extern const struct nf_nat_l4proto nf_nat_l4proto_tcp;
+extern const struct nf_nat_l4proto nf_nat_l4proto_udp;
+extern const struct nf_nat_l4proto nf_nat_l4proto_icmp;
+extern const struct nf_nat_l4proto nf_nat_l4proto_unknown;
 
-extern bool nf_nat_proto_in_range(const struct nf_conntrack_tuple *tuple,
-				  enum nf_nat_manip_type maniptype,
-				  const union nf_conntrack_man_proto *min,
-				  const union nf_conntrack_man_proto *max);
+extern bool nf_nat_l4proto_in_range(const struct nf_conntrack_tuple *tuple,
+				    enum nf_nat_manip_type maniptype,
+				    const union nf_conntrack_man_proto *min,
+				    const union nf_conntrack_man_proto *max);
 
-extern void nf_nat_proto_unique_tuple(struct nf_conntrack_tuple *tuple,
-				      const struct nf_nat_ipv4_range *range,
-				      enum nf_nat_manip_type maniptype,
-				      const struct nf_conn *ct,
-				      u_int16_t *rover);
+extern void nf_nat_l4proto_unique_tuple(const struct nf_nat_l3proto *l3proto,
+					struct nf_conntrack_tuple *tuple,
+					const struct nf_nat_range *range,
+					enum nf_nat_manip_type maniptype,
+					const struct nf_conn *ct,
+					u16 *rover);
 
-extern int nf_nat_proto_nlattr_to_range(struct nlattr *tb[],
-					struct nf_nat_ipv4_range *range);
+extern int nf_nat_l4proto_nlattr_to_range(struct nlattr *tb[],
+					  struct nf_nat_range *range);
 
-#endif /*_NF_NAT_PROTO_H*/
+#endif /*_NF_NAT_L4PROTO_H*/

include/net/netfilter/nf_nat_rule.h

-#ifndef _NF_NAT_RULE_H
-#define _NF_NAT_RULE_H
-#include <net/netfilter/nf_conntrack.h>
-#include <net/netfilter/nf_nat.h>
-#include <linux/netfilter_ipv4/ip_tables.h>
-
-extern int nf_nat_rule_init(void) __init;
-extern void nf_nat_rule_cleanup(void);
-extern int nf_nat_rule_find(struct sk_buff *skb,
-			    unsigned int hooknum,
-			    const struct net_device *in,
-			    const struct net_device *out,
-			    struct nf_conn *ct);
-
-#endif /* _NF_NAT_RULE_H */

include/net/netns/conntrack.h

@@ -83,6 +83,10 @@ struct netns_ct {
 	int			sysctl_auto_assign_helper;
 	bool			auto_assign_helper_warned;
 	struct nf_ip_net	nf_ct_proto;
+#ifdef CONFIG_NF_NAT_NEEDED
+	struct hlist_head	*nat_bysource;
+	unsigned int		nat_htable_size;
+#endif
 #ifdef CONFIG_SYSCTL
 	struct ctl_table_header	*sysctl_header;
 	struct ctl_table_header	*acct_sysctl_header;

include/net/netns/ipv4.h

@@ -51,8 +51,6 @@ struct netns_ipv4 {
 	struct xt_table		*iptable_security;
 #endif
 	struct xt_table		*nat_table;
-	struct hlist_head	*nat_bysource;
-	unsigned int		nat_htable_size;
 #endif
 
 	int sysctl_icmp_echo_ignore_all;

net/ipv4/netfilter.c

@@ -72,43 +72,6 @@ int ip_route_me_harder(struct sk_buff *skb, unsigned int addr_type)
 }
 EXPORT_SYMBOL(ip_route_me_harder);
 
-#ifdef CONFIG_XFRM
-int ip_xfrm_me_harder(struct sk_buff *skb)
-{
-	struct flowi fl;
-	unsigned int hh_len;
-	struct dst_entry *dst;
-
-	if (IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED)
-		return 0;
-	if (xfrm_decode_session(skb, &fl, AF_INET) < 0)
-		return -1;
-
-	dst = skb_dst(skb);
-	if (dst->xfrm)
-		dst = ((struct xfrm_dst *)dst)->route;
-	dst_hold(dst);
-
-	dst = xfrm_lookup(dev_net(dst->dev), dst, &fl, skb->sk, 0);
-	if (IS_ERR(dst))
-		return -1;
-
-	skb_dst_drop(skb);
-	skb_dst_set(skb, dst);
-
-	/* Change in oif may mean change in hh_len. */
-	hh_len = skb_dst(skb)->dev->hard_header_len;
-	if (skb_headroom(skb) < hh_len &&
-	    pskb_expand_head(skb, hh_len - skb_headroom(skb), 0, GFP_ATOMIC))
-		return -1;
-	return 0;
-}
-EXPORT_SYMBOL(ip_xfrm_me_harder);
-#endif
-
-void (*ip_nat_decode_session)(struct sk_buff *, struct flowi *);
-EXPORT_SYMBOL(ip_nat_decode_session);
-
 /*
  * Extra routing may needed on local out, as the QUEUE target never
  * returns control to the table.

net/ipv4/netfilter/Kconfig

@@ -143,25 +143,22 @@ config IP_NF_TARGET_ULOG
 	  To compile it as a module, choose M here.  If unsure, say N.
 
 # NAT + specific targets: nf_conntrack
-config NF_NAT
-	tristate "Full NAT"
+config NF_NAT_IPV4
+	tristate "IPv4 NAT"
 	depends on NF_CONNTRACK_IPV4
 	default m if NETFILTER_ADVANCED=n
+	select NF_NAT
 	help
-	  The Full NAT option allows masquerading, port forwarding and other
+	  The IPv4 NAT option allows masquerading, port forwarding and other
 	  forms of full Network Address Port Translation.  It is controlled by
 	  the `nat' table in iptables: see the man page for iptables(8).
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
-config NF_NAT_NEEDED
-	bool
-	depends on NF_NAT
-	default y
+if NF_NAT_IPV4
 
 config IP_NF_TARGET_MASQUERADE
 	tristate "MASQUERADE target support"
-	depends on NF_NAT
 	default m if NETFILTER_ADVANCED=n
 	help
 	  Masquerading is a special case of NAT: all outgoing connections are
@@ -174,7 +171,6 @@ config IP_NF_TARGET_MASQUERADE
 
 config IP_NF_TARGET_NETMAP
 	tristate "NETMAP target support"
-	depends on NF_NAT
 	depends on NETFILTER_ADVANCED
 	help
 	  NETMAP is an implementation of static 1:1 NAT mapping of network
@@ -185,7 +181,6 @@ config IP_NF_TARGET_NETMAP
 
 config IP_NF_TARGET_REDIRECT
 	tristate "REDIRECT target support"
-	depends on NF_NAT
 	depends on NETFILTER_ADVANCED
 	help
 	  REDIRECT is a special case of NAT: all incoming connections are
@@ -195,9 +190,11 @@ config IP_NF_TARGET_REDIRECT
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
+endif
+
 config NF_NAT_SNMP_BASIC
 	tristate "Basic SNMP-ALG support"
-	depends on NF_CONNTRACK_SNMP && NF_NAT
+	depends on NF_CONNTRACK_SNMP && NF_NAT_IPV4
 	depends on NETFILTER_ADVANCED
 	default NF_NAT && NF_CONNTRACK_SNMP
 	---help---
@@ -219,61 +216,46 @@ config NF_NAT_SNMP_BASIC
 #           <expr> '&&' <expr>                   (6)
 #
 # (6) Returns the result of min(/expr/, /expr/).
-config NF_NAT_PROTO_DCCP
-	tristate
-	depends on NF_NAT && NF_CT_PROTO_DCCP
-	default NF_NAT && NF_CT_PROTO_DCCP
 
 config NF_NAT_PROTO_GRE
 	tristate
-	depends on NF_NAT && NF_CT_PROTO_GRE
-
-config NF_NAT_PROTO_UDPLITE
-	tristate
-	depends on NF_NAT && NF_CT_PROTO_UDPLITE
-	default NF_NAT && NF_CT_PROTO_UDPLITE
-
-config NF_NAT_PROTO_SCTP
-	tristate
-	default NF_NAT && NF_CT_PROTO_SCTP
-	depends on NF_NAT && NF_CT_PROTO_SCTP
-	select LIBCRC32C
+	depends on NF_NAT_IPV4 && NF_CT_PROTO_GRE
 
 config NF_NAT_FTP
 	tristate
-	depends on NF_CONNTRACK && NF_NAT
-	default NF_NAT && NF_CONNTRACK_FTP
+	depends on NF_CONNTRACK && NF_NAT_IPV4
+	default NF_NAT_IPV4 && NF_CONNTRACK_FTP
 
 config NF_NAT_IRC
 	tristate
-	depends on NF_CONNTRACK && NF_NAT
-	default NF_NAT && NF_CONNTRACK_IRC
+	depends on NF_CONNTRACK && NF_NAT_IPV4
+	default NF_NAT_IPV4 && NF_CONNTRACK_IRC
 
 config NF_NAT_TFTP
 	tristate
-	depends on NF_CONNTRACK && NF_NAT
-	default NF_NAT && NF_CONNTRACK_TFTP
+	depends on NF_CONNTRACK && NF_NAT_IPV4
+	default NF_NAT_IPV4 && NF_CONNTRACK_TFTP
 
 config NF_NAT_AMANDA
 	tristate
-	depends on NF_CONNTRACK && NF_NAT
-	default NF_NAT && NF_CONNTRACK_AMANDA
+	depends on NF_CONNTRACK && NF_NAT_IPV4
+	default NF_NAT_IPV4 && NF_CONNTRACK_AMANDA
 
 config NF_NAT_PPTP
 	tristate
-	depends on NF_CONNTRACK && NF_NAT
-	default NF_NAT && NF_CONNTRACK_PPTP
+	depends on NF_CONNTRACK && NF_NAT_IPV4
+	default NF_NAT_IPV4 && NF_CONNTRACK_PPTP
 	select NF_NAT_PROTO_GRE
 
 config NF_NAT_H323
 	tristate
-	depends on NF_CONNTRACK && NF_NAT
-	default NF_NAT && NF_CONNTRACK_H323
+	depends on NF_CONNTRACK && NF_NAT_IPV4
+	default NF_NAT_IPV4 && NF_CONNTRACK_H323
 
 config NF_NAT_SIP
 	tristate
-	depends on NF_CONNTRACK && NF_NAT
-	default NF_NAT && NF_CONNTRACK_SIP
+	depends on NF_CONNTRACK && NF_NAT_IPV4
+	default NF_NAT_IPV4 && NF_CONNTRACK_SIP
 
 # mangle + specific targets
 config IP_NF_MANGLE

net/ipv4/netfilter/Makefile

@@ -10,13 +10,11 @@ nf_conntrack_ipv4-objs	+= nf_conntrack_l3proto_ipv4_compat.o
 endif
 endif
 
-nf_nat-y		:= nf_nat_core.o nf_nat_helper.o nf_nat_proto_unknown.o nf_nat_proto_common.o nf_nat_proto_tcp.o nf_nat_proto_udp.o nf_nat_proto_icmp.o
-iptable_nat-y	:= nf_nat_rule.o nf_nat_standalone.o
-
 # connection tracking
 obj-$(CONFIG_NF_CONNTRACK_IPV4) += nf_conntrack_ipv4.o
 
-obj-$(CONFIG_NF_NAT) += nf_nat.o
+nf_nat_ipv4-y		:= nf_nat_l3proto_ipv4.o nf_nat_proto_icmp.o
+obj-$(CONFIG_NF_NAT_IPV4) += nf_nat_ipv4.o
 
 # defrag
 obj-$(CONFIG_NF_DEFRAG_IPV4) += nf_defrag_ipv4.o
@@ -32,10 +30,7 @@ obj-$(CONFIG_NF_NAT_SNMP_BASIC) += nf_nat_snmp_basic.o
 obj-$(CONFIG_NF_NAT_TFTP) += nf_nat_tftp.o
 
 # NAT protocols (nf_nat)
-obj-$(CONFIG_NF_NAT_PROTO_DCCP) += nf_nat_proto_dccp.o
 obj-$(CONFIG_NF_NAT_PROTO_GRE) += nf_nat_proto_gre.o
-obj-$(CONFIG_NF_NAT_PROTO_UDPLITE) += nf_nat_proto_udplite.o
-obj-$(CONFIG_NF_NAT_PROTO_SCTP) += nf_nat_proto_sctp.o
 
 # generic IP tables 
 obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o
@@ -43,7 +38,7 @@ obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o
 # the three instances of ip_tables
 obj-$(CONFIG_IP_NF_FILTER) += iptable_filter.o
 obj-$(CONFIG_IP_NF_MANGLE) += iptable_mangle.o
-obj-$(CONFIG_NF_NAT) += iptable_nat.o
+obj-$(CONFIG_NF_NAT_IPV4) += iptable_nat.o
 obj-$(CONFIG_IP_NF_RAW) += iptable_raw.o
 obj-$(CONFIG_IP_NF_SECURITY) += iptable_security.o
 

net/ipv4/netfilter/ipt_MASQUERADE.c

@@ -19,9 +19,9 @@
 #include <net/ip.h>
 #include <net/checksum.h>
 #include <net/route.h>
-#include <net/netfilter/nf_nat_rule.h>
 #include <linux/netfilter_ipv4.h>
 #include <linux/netfilter/x_tables.h>
+#include <net/netfilter/nf_nat.h>
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
@@ -49,7 +49,7 @@ masquerade_tg(struct sk_buff *skb, const struct xt_action_param *par)
 	struct nf_conn *ct;
 	struct nf_conn_nat *nat;
 	enum ip_conntrack_info ctinfo;
-	struct nf_nat_ipv4_range newrange;
+	struct nf_nat_range newrange;
 	const struct nf_nat_ipv4_multi_range_compat *mr;
 	const struct rtable *rt;
 	__be32 newsrc, nh;
@@ -80,10 +80,13 @@ masquerade_tg(struct sk_buff *skb, const struct xt_action_param *par)
 	nat->masq_index = par->out->ifindex;
 
 	/* Transfer from original range. */
-	newrange = ((struct nf_nat_ipv4_range)
-		{ mr->range[0].flags | NF_NAT_RANGE_MAP_IPS,
-		  newsrc, newsrc,
-		  mr->range[0].min, mr->range[0].max });
+	memset(&newrange.min_addr, 0, sizeof(newrange.min_addr));
+	memset(&newrange.max_addr, 0, sizeof(newrange.max_addr));
+	newrange.flags       = mr->range[0].flags | NF_NAT_RANGE_MAP_IPS;
+	newrange.min_addr.ip = newsrc;
+	newrange.max_addr.ip = newsrc;
+	newrange.min_proto   = mr->range[0].min;
+	newrange.max_proto   = mr->range[0].max;
 
 	/* Hand modified range to generic setup. */
 	return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_SRC);

net/ipv4/netfilter/ipt_NETMAP.c

@@ -16,7 +16,7 @@
 #include <linux/netfilter.h>
 #include <linux/netfilter_ipv4.h>
 #include <linux/netfilter/x_tables.h>
-#include <net/netfilter/nf_nat_rule.h>
+#include <net/netfilter/nf_nat.h>
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Svenning Soerensen <svenning@post5.tele.dk>");
@@ -44,7 +44,7 @@ netmap_tg(struct sk_buff *skb, const struct xt_action_param *par)
 	enum ip_conntrack_info ctinfo;
 	__be32 new_ip, netmask;
 	const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
-	struct nf_nat_ipv4_range newrange;
+	struct nf_nat_range newrange;
 
 	NF_CT_ASSERT(par->hooknum == NF_INET_PRE_ROUTING ||
 		     par->hooknum == NF_INET_POST_ROUTING ||
@@ -61,10 +61,13 @@ netmap_tg(struct sk_buff *skb, const struct xt_action_param *par)
 		new_ip = ip_hdr(skb)->saddr & ~netmask;
 	new_ip |= mr->range[0].min_ip & netmask;
 
-	newrange = ((struct nf_nat_ipv4_range)
-		{ mr->range[0].flags | NF_NAT_RANGE_MAP_IPS,
-		  new_ip, new_ip,
-		  mr->range[0].min, mr->range[0].max });
+	memset(&newrange.min_addr, 0, sizeof(newrange.min_addr));
+	memset(&newrange.max_addr, 0, sizeof(newrange.max_addr));
+	newrange.flags	     = mr->range[0].flags | NF_NAT_RANGE_MAP_IPS;
+	newrange.min_addr.ip = new_ip;
+	newrange.max_addr.ip = new_ip;
+	newrange.min_proto   = mr->range[0].min;
+	newrange.max_proto   = mr->range[0].max;
 
 	/* Hand modified range to generic setup. */
 	return nf_nat_setup_info(ct, &newrange, HOOK2MANIP(par->hooknum));

net/ipv4/netfilter/ipt_REDIRECT.c

@@ -19,7 +19,7 @@
 #include <net/checksum.h>
 #include <linux/netfilter_ipv4.h>
 #include <linux/netfilter/x_tables.h>
-#include <net/netfilter/nf_nat_rule.h>
+#include <net/netfilter/nf_nat.h>
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
@@ -48,7 +48,7 @@ redirect_tg(struct sk_buff *skb, const struct xt_action_param *par)
 	enum ip_conntrack_info ctinfo;
 	__be32 newdst;
 	const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
-	struct nf_nat_ipv4_range newrange;
+	struct nf_nat_range newrange;
 
 	NF_CT_ASSERT(par->hooknum == NF_INET_PRE_ROUTING ||
 		     par->hooknum == NF_INET_LOCAL_OUT);
@@ -76,10 +76,13 @@ redirect_tg(struct sk_buff *skb, const struct xt_action_param *par)
 	}
 
 	/* Transfer from original range. */
-	newrange = ((struct nf_nat_ipv4_range)
-		{ mr->range[0].flags | NF_NAT_RANGE_MAP_IPS,
-		  newdst, newdst,
-		  mr->range[0].min, mr->range[0].max });
+	memset(&newrange.min_addr, 0, sizeof(newrange.min_addr));
+	memset(&newrange.max_addr, 0, sizeof(newrange.max_addr));
+	newrange.flags	     = mr->range[0].flags | NF_NAT_RANGE_MAP_IPS;
+	newrange.min_addr.ip = newdst;
+	newrange.max_addr.ip = newdst;
+	newrange.min_proto   = mr->range[0].min;
+	newrange.max_proto   = mr->range[0].max;
 
 	/* Hand modified range to generic setup. */
 	return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_DST);

net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c

@@ -29,12 +29,6 @@
 #include <net/netfilter/ipv4/nf_defrag_ipv4.h>
 #include <net/netfilter/nf_log.h>
 
-int (*nf_nat_seq_adjust_hook)(struct sk_buff *skb,
-			      struct nf_conn *ct,
-			      enum ip_conntrack_info ctinfo,
-			      unsigned int protoff);
-EXPORT_SYMBOL_GPL(nf_nat_seq_adjust_hook);
-
 static bool ipv4_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff,
 			      struct nf_conntrack_tuple *tuple)
 {

net/ipv4/netfilter/nf_nat_amanda.c

@@ -16,7 +16,6 @@
 #include <net/netfilter/nf_conntrack_helper.h>
 #include <net/netfilter/nf_conntrack_expect.h>
 #include <net/netfilter/nf_nat_helper.h>
-#include <net/netfilter/nf_nat_rule.h>
 #include <linux/netfilter/nf_conntrack_amanda.h>
 
 MODULE_AUTHOR("Brian J. Murrell <netfilter@interlinx.bc.ca>");

net/ipv4/netfilter/nf_nat_ftp.c

@@ -15,7 +15,6 @@
 #include <linux/netfilter_ipv4.h>
 #include <net/netfilter/nf_nat.h>
 #include <net/netfilter/nf_nat_helper.h>
-#include <net/netfilter/nf_nat_rule.h>
 #include <net/netfilter/nf_conntrack_helper.h>
 #include <net/netfilter/nf_conntrack_expect.h>
 #include <linux/netfilter/nf_conntrack_ftp.h>

net/ipv4/netfilter/nf_nat_h323.c

@@ -15,7 +15,6 @@
 
 #include <net/netfilter/nf_nat.h>
 #include <net/netfilter/nf_nat_helper.h>
-#include <net/netfilter/nf_nat_rule.h>
 #include <net/netfilter/nf_conntrack_helper.h>
 #include <net/netfilter/nf_conntrack_expect.h>
 #include <linux/netfilter/nf_conntrack_h323.h>
@@ -392,7 +391,7 @@ static int nat_h245(struct sk_buff *skb, struct nf_conn *ct,
 static void ip_nat_q931_expect(struct nf_conn *new,
 			       struct nf_conntrack_expect *this)
 {
-	struct nf_nat_ipv4_range range;
+	struct nf_nat_range range;
 
 	if (this->tuple.src.u3.ip != 0) {	/* Only accept calls from GK */
 		nf_nat_follow_master(new, this);
@@ -404,14 +403,15 @@ static void ip_nat_q931_expect(struct nf_conn *new,
 
 	/* Change src to where master sends to */
 	range.flags = NF_NAT_RANGE_MAP_IPS;
-	range.min_ip = range.max_ip = new->tuplehash[!this->dir].tuple.src.u3.ip;
+	range.min_addr = range.max_addr =
+	    new->tuplehash[!this->dir].tuple.src.u3;
 	nf_nat_setup_info(new, &range, NF_NAT_MANIP_SRC);
 
 	/* For DST manip, map port here to where it's expected. */
 	range.flags = (NF_NAT_RANGE_MAP_IPS | NF_NAT_RANGE_PROTO_SPECIFIED);
-	range.min = range.max = this->saved_proto;
-	range.min_ip = range.max_ip =
-	    new->master->tuplehash[!this->dir].tuple.src.u3.ip;
+	range.min_proto = range.max_proto = this->saved_proto;
+	range.min_addr = range.max_addr =
+	    new->master->tuplehash[!this->dir].tuple.src.u3;
 	nf_nat_setup_info(new, &range, NF_NAT_MANIP_DST);
 }
 
@@ -490,20 +490,21 @@ static int nat_q931(struct sk_buff *skb, struct nf_conn *ct,
 static void ip_nat_callforwarding_expect(struct nf_conn *new,
 					 struct nf_conntrack_expect *this)
 {
-	struct nf_nat_ipv4_range range;
+	struct nf_nat_range range;
 
 	/* This must be a fresh one. */
 	BUG_ON(new->status & IPS_NAT_DONE_MASK);
 
 	/* Change src to where master sends to */
 	range.flags = NF_NAT_RANGE_MAP_IPS;
-	range.min_ip = range.max_ip = new->tuplehash[!this->dir].tuple.src.u3.ip;
+	range.min_addr = range.max_addr =
+	    new->tuplehash[!this->dir].tuple.src.u3;
 	nf_nat_setup_info(new, &range, NF_NAT_MANIP_SRC);
 
 	/* For DST manip, map port here to where it's expected. */
 	range.flags = (NF_NAT_RANGE_MAP_IPS | NF_NAT_RANGE_PROTO_SPECIFIED);
-	range.min = range.max = this->saved_proto;
-	range.min_ip = range.max_ip = this->saved_ip;
+	range.min_proto = range.max_proto = this->saved_proto;
+	range.min_addr = range.max_addr = this->saved_addr;
 	nf_nat_setup_info(new, &range, NF_NAT_MANIP_DST);
 }
 
@@ -519,7 +520,7 @@ static int nat_callforwarding(struct sk_buff *skb, struct nf_conn *ct,
 	u_int16_t nated_port;
 
 	/* Set expectations for NAT */
-	exp->saved_ip = exp->tuple.dst.u3.ip;
+	exp->saved_addr = exp->tuple.dst.u3;
 	exp->tuple.dst.u3.ip = ct->tuplehash[!dir].tuple.dst.u3.ip;
 	exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
 	exp->expectfn = ip_nat_callforwarding_expect;

net/ipv4/netfilter/nf_nat_irc.c

@@ -17,7 +17,6 @@
 
 #include <net/netfilter/nf_nat.h>
 #include <net/netfilter/nf_nat_helper.h>
-#include <net/netfilter/nf_nat_rule.h>
 #include <net/netfilter/nf_conntrack_helper.h>
 #include <net/netfilter/nf_conntrack_expect.h>
 #include <linux/netfilter/nf_conntrack_irc.h>

net/ipv4/netfilter/nf_nat_l3proto_ipv4.c

+/*
+ * (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
+ * (C) 2011 Patrick McHardy <kaber@trash.net>
+ *
+ * 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/types.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/icmp.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+#include <net/secure_seq.h>
+#include <net/checksum.h>
+#include <net/route.h>
+#include <net/ip.h>
+
+#include <net/netfilter/nf_conntrack_core.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_nat_core.h>
+#include <net/netfilter/nf_nat_l3proto.h>
+#include <net/netfilter/nf_nat_l4proto.h>
+
+static const struct nf_nat_l3proto nf_nat_l3proto_ipv4;
+
+#ifdef CONFIG_XFRM
+static void nf_nat_ipv4_decode_session(struct sk_buff *skb,
+				       const struct nf_conn *ct,
+				       enum ip_conntrack_dir dir,
+				       unsigned long statusbit,
+				       struct flowi *fl)
+{
+	const struct nf_conntrack_tuple *t = &ct->tuplehash[dir].tuple;
+	struct flowi4 *fl4 = &fl->u.ip4;
+
+	if (ct->status & statusbit) {
+		fl4->daddr = t->dst.u3.ip;
+		if (t->dst.protonum == IPPROTO_TCP ||
+		    t->dst.protonum == IPPROTO_UDP ||
+		    t->dst.protonum == IPPROTO_UDPLITE ||
+		    t->dst.protonum == IPPROTO_DCCP ||
+		    t->dst.protonum == IPPROTO_SCTP)
+			fl4->fl4_dport = t->dst.u.all;
+	}
+
+	statusbit ^= IPS_NAT_MASK;
+
+	if (ct->status & statusbit) {
+		fl4->saddr = t->src.u3.ip;
+		if (t->dst.protonum == IPPROTO_TCP ||
+		    t->dst.protonum == IPPROTO_UDP ||
+		    t->dst.protonum == IPPROTO_UDPLITE ||
+		    t->dst.protonum == IPPROTO_DCCP ||
+		    t->dst.protonum == IPPROTO_SCTP)
+			fl4->fl4_sport = t->src.u.all;
+	}
+}
+#endif /* CONFIG_XFRM */
+
+static bool nf_nat_ipv4_in_range(const struct nf_conntrack_tuple *t,
+				 const struct nf_nat_range *range)
+{
+	return ntohl(t->src.u3.ip) >= ntohl(range->min_addr.ip) &&
+	       ntohl(t->src.u3.ip) <= ntohl(range->max_addr.ip);
+}
+
+static u32 nf_nat_ipv4_secure_port(const struct nf_conntrack_tuple *t,
+				   __be16 dport)
+{
+	return secure_ipv4_port_ephemeral(t->src.u3.ip, t->dst.u3.ip, dport);
+}
+
+static bool nf_nat_ipv4_manip_pkt(struct sk_buff *skb,
+				  unsigned int iphdroff,
+				  const struct nf_nat_l4proto *l4proto,
+				  const struct nf_conntrack_tuple *target,
+				  enum nf_nat_manip_type maniptype)
+{
+	struct iphdr *iph;
+	unsigned int hdroff;
+
+	if (!skb_make_writable(skb, iphdroff + sizeof(*iph)))
+		return false;
+
+	iph = (void *)skb->data + iphdroff;
+	hdroff = iphdroff + iph->ihl * 4;
+
+	if (!l4proto->manip_pkt(skb, &nf_nat_l3proto_ipv4, iphdroff, hdroff,
+				target, maniptype))
+		return false;
+	iph = (void *)skb->data + iphdroff;
+
+	if (maniptype == NF_NAT_MANIP_SRC) {
+		csum_replace4(&iph->check, iph->saddr, target->src.u3.ip);
+		iph->saddr = target->src.u3.ip;
+	} else {
+		csum_replace4(&iph->check, iph->daddr, target->dst.u3.ip);
+		iph->daddr = target->dst.u3.ip;
+	}
+	return true;
+}
+
+static void nf_nat_ipv4_csum_update(struct sk_buff *skb,
+				    unsigned int iphdroff, __sum16 *check,
+				    const struct nf_conntrack_tuple *t,
+				    enum nf_nat_manip_type maniptype)
+{
+	struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
+	__be32 oldip, newip;
+
+	if (maniptype == NF_NAT_MANIP_SRC) {
+		oldip = iph->saddr;
+		newip = t->src.u3.ip;
+	} else {
+		oldip = iph->daddr;
+		newip = t->dst.u3.ip;
+	}
+	inet_proto_csum_replace4(check, skb, oldip, newip, 1);
+}
+
+static void nf_nat_ipv4_csum_recalc(struct sk_buff *skb,
+				    u8 proto, void *data, __sum16 *check,
+				    int datalen, int oldlen)
+{
+	const struct iphdr *iph = ip_hdr(skb);
+	struct rtable *rt = skb_rtable(skb);
+
+	if (skb->ip_summed != CHECKSUM_PARTIAL) {
+		if (!(rt->rt_flags & RTCF_LOCAL) &&
+		    (!skb->dev || skb->dev->features & NETIF_F_V4_CSUM)) {
+			skb->ip_summed = CHECKSUM_PARTIAL;
+			skb->csum_start = skb_headroom(skb) +
+					  skb_network_offset(skb) +
+					  ip_hdrlen(skb);
+			skb->csum_offset = (void *)check - data;
+			*check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
+						    datalen, proto, 0);
+		} else {
+			*check = 0;
+			*check = csum_tcpudp_magic(iph->saddr, iph->daddr,
+						   datalen, proto,
+						   csum_partial(data, datalen,
+								0));
+			if (proto == IPPROTO_UDP && !*check)
+				*check = CSUM_MANGLED_0;
+		}
+	} else
+		inet_proto_csum_replace2(check, skb,
+					 htons(oldlen), htons(datalen), 1);
+}
+
+static int nf_nat_ipv4_nlattr_to_range(struct nlattr *tb[],
+				       struct nf_nat_range *range)
+{
+	if (tb[CTA_NAT_V4_MINIP]) {
+		range->min_addr.ip = nla_get_be32(tb[CTA_NAT_V4_MINIP]);
+		range->flags |= NF_NAT_RANGE_MAP_IPS;
+	}
+
+	if (tb[CTA_NAT_V4_MAXIP])
+		range->max_addr.ip = nla_get_be32(tb[CTA_NAT_V4_MAXIP]);
+	else
+		range->max_addr.ip = range->min_addr.ip;
+
+	return 0;
+}
+
+static const struct nf_nat_l3proto nf_nat_l3proto_ipv4 = {
+	.l3proto		= NFPROTO_IPV4,
+	.in_range		= nf_nat_ipv4_in_range,
+	.secure_port		= nf_nat_ipv4_secure_port,
+	.manip_pkt		= nf_nat_ipv4_manip_pkt,
+	.csum_update		= nf_nat_ipv4_csum_update,
+	.csum_recalc		= nf_nat_ipv4_csum_recalc,
+	.nlattr_to_range	= nf_nat_ipv4_nlattr_to_range,
+#ifdef CONFIG_XFRM
+	.decode_session		= nf_nat_ipv4_decode_session,
+#endif
+};
+
+int nf_nat_icmp_reply_translation(struct sk_buff *skb,
+				  struct nf_conn *ct,
+				  enum ip_conntrack_info ctinfo,
+				  unsigned int hooknum)
+{
+	struct {
+		struct icmphdr	icmp;
+		struct iphdr	ip;
+	} *inside;
+	enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
+	enum nf_nat_manip_type manip = HOOK2MANIP(hooknum);
+	unsigned int hdrlen = ip_hdrlen(skb);
+	const struct nf_nat_l4proto *l4proto;
+	struct nf_conntrack_tuple target;
+	unsigned long statusbit;
+
+	NF_CT_ASSERT(ctinfo == IP_CT_RELATED || ctinfo == IP_CT_RELATED_REPLY);
+
+	if (!skb_make_writable(skb, hdrlen + sizeof(*inside)))
+		return 0;
+	if (nf_ip_checksum(skb, hooknum, hdrlen, 0))
+		return 0;
+
+	inside = (void *)skb->data + hdrlen;
+	if (inside->icmp.type == ICMP_REDIRECT) {
+		if ((ct->status & IPS_NAT_DONE_MASK) != IPS_NAT_DONE_MASK)
+			return 0;
+		if (ct->status & IPS_NAT_MASK)
+			return 0;
+	}
+
+	if (manip == NF_NAT_MANIP_SRC)
+		statusbit = IPS_SRC_NAT;
+	else
+		statusbit = IPS_DST_NAT;
+
+	/* Invert if this is reply direction */
+	if (dir == IP_CT_DIR_REPLY)
+		statusbit ^= IPS_NAT_MASK;
+
+	if (!(ct->status & statusbit))
+		return 1;
+
+	l4proto = __nf_nat_l4proto_find(NFPROTO_IPV4, inside->ip.protocol);
+	if (!nf_nat_ipv4_manip_pkt(skb, hdrlen + sizeof(inside->icmp),
+				   l4proto, &ct->tuplehash[!dir].tuple, !manip))
+		return 0;
+
+	if (skb->ip_summed != CHECKSUM_PARTIAL) {
+		/* Reloading "inside" here since manip_pkt may reallocate */
+		inside = (void *)skb->data + hdrlen;
+		inside->icmp.checksum = 0;
+		inside->icmp.checksum =
+			csum_fold(skb_checksum(skb, hdrlen,
+					       skb->len - hdrlen, 0));
+	}
+
+	/* Change outer to look like the reply to an incoming packet */
+	nf_ct_invert_tuplepr(&target, &ct->tuplehash[!dir].tuple);
+	l4proto = __nf_nat_l4proto_find(NFPROTO_IPV4, 0);
+	if (!nf_nat_ipv4_manip_pkt(skb, 0, l4proto, &target, manip))
+		return 0;
+
+	return 1;
+}
+EXPORT_SYMBOL_GPL(nf_nat_icmp_reply_translation);
+
+static int __init nf_nat_l3proto_ipv4_init(void)
+{
+	int err;
+
+	err = nf_nat_l4proto_register(NFPROTO_IPV4, &nf_nat_l4proto_icmp);
+	if (err < 0)
+		goto err1;
+	err = nf_nat_l3proto_register(&nf_nat_l3proto_ipv4);
+	if (err < 0)
+		goto err2;
+	return err;
+
+err2:
+	nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_icmp);
+err1:
+	return err;
+}
+
+static void __exit nf_nat_l3proto_ipv4_exit(void)
+{
+	nf_nat_l3proto_unregister(&nf_nat_l3proto_ipv4);
+	nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_icmp);
+}
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("nf-nat-" __stringify(AF_INET));
+
+module_init(nf_nat_l3proto_ipv4_init);
+module_exit(nf_nat_l3proto_ipv4_exit);

net/ipv4/netfilter/nf_nat_pptp.c

@@ -22,7 +22,6 @@
 
 #include <net/netfilter/nf_nat.h>
 #include <net/netfilter/nf_nat_helper.h>
-#include <net/netfilter/nf_nat_rule.h>
 #include <net/netfilter/nf_conntrack_helper.h>
 #include <net/netfilter/nf_conntrack_expect.h>
 #include <net/netfilter/nf_conntrack_zones.h>
@@ -47,7 +46,7 @@ static void pptp_nat_expected(struct nf_conn *ct,
 	struct nf_conntrack_tuple t;
 	const struct nf_ct_pptp_master *ct_pptp_info;
 	const struct nf_nat_pptp *nat_pptp_info;
-	struct nf_nat_ipv4_range range;
+	struct nf_nat_range range;
 
 	ct_pptp_info = nfct_help_data(master);
 	nat_pptp_info = &nfct_nat(master)->help.nat_pptp_info;
@@ -89,21 +88,21 @@ static void pptp_nat_expected(struct nf_conn *ct,
 
 	/* Change src to where master sends to */
 	range.flags = NF_NAT_RANGE_MAP_IPS;
-	range.min_ip = range.max_ip
-		= ct->master->tuplehash[!exp->dir].tuple.dst.u3.ip;
+	range.min_addr = range.max_addr
+		= ct->master->tuplehash[!exp->dir].tuple.dst.u3;
 	if (exp->dir == IP_CT_DIR_ORIGINAL) {
 		range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
-		range.min = range.max = exp->saved_proto;
+		range.min_proto = range.max_proto = exp->saved_proto;
 	}
 	nf_nat_setup_info(ct, &range, NF_NAT_MANIP_SRC);
 
 	/* For DST manip, map port here to where it's expected. */
 	range.flags = NF_NAT_RANGE_MAP_IPS;
-	range.min_ip = range.max_ip
-		= ct->master->tuplehash[!exp->dir].tuple.src.u3.ip;
+	range.min_addr = range.max_addr
+		= ct->master->tuplehash[!exp->dir].tuple.src.u3;
 	if (exp->dir == IP_CT_DIR_REPLY) {
 		range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
-		range.min = range.max = exp->saved_proto;
+		range.min_proto = range.max_proto = exp->saved_proto;
 	}
 	nf_nat_setup_info(ct, &range, NF_NAT_MANIP_DST);
 }

net/ipv4/netfilter/nf_nat_proto_gre.c

@@ -28,8 +28,7 @@
 #include <linux/ip.h>
 
 #include <net/netfilter/nf_nat.h>
-#include <net/netfilter/nf_nat_rule.h>
-#include <net/netfilter/nf_nat_protocol.h>
+#include <net/netfilter/nf_nat_l4proto.h>
 #include <linux/netfilter/nf_conntrack_proto_gre.h>
 
 MODULE_LICENSE("GPL");
@@ -38,8 +37,9 @@ MODULE_DESCRIPTION("Netfilter NAT protocol helper module for GRE");
 
 /* generate unique tuple ... */
 static void
-gre_unique_tuple(struct nf_conntrack_tuple *tuple,
-		 const struct nf_nat_ipv4_range *range,
+gre_unique_tuple(const struct nf_nat_l3proto *l3proto,
+		 struct nf_conntrack_tuple *tuple,
+		 const struct nf_nat_range *range,
 		 enum nf_nat_manip_type maniptype,
 		 const struct nf_conn *ct)
 {
@@ -62,8 +62,8 @@ gre_unique_tuple(struct nf_conntrack_tuple *tuple,
 		min = 1;
 		range_size = 0xffff;
 	} else {
-		min = ntohs(range->min.gre.key);
-		range_size = ntohs(range->max.gre.key) - min + 1;
+		min = ntohs(range->min_proto.gre.key);
+		range_size = ntohs(range->max_proto.gre.key) - min + 1;
 	}
 
 	pr_debug("min = %u, range_size = %u\n", min, range_size);
@@ -80,14 +80,14 @@ gre_unique_tuple(struct nf_conntrack_tuple *tuple,
 
 /* manipulate a GRE packet according to maniptype */
 static bool
-gre_manip_pkt(struct sk_buff *skb, unsigned int iphdroff,
+gre_manip_pkt(struct sk_buff *skb,
+	      const struct nf_nat_l3proto *l3proto,
+	      unsigned int iphdroff, unsigned int hdroff,
 	      const struct nf_conntrack_tuple *tuple,
 	      enum nf_nat_manip_type maniptype)
 {
 	const struct gre_hdr *greh;
 	struct gre_hdr_pptp *pgreh;
-	const struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
-	unsigned int hdroff = iphdroff + iph->ihl * 4;
 
 	/* pgreh includes two optional 32bit fields which are not required
 	 * to be there.  That's where the magic '8' comes from */
@@ -117,24 +117,24 @@ gre_manip_pkt(struct sk_buff *skb, unsigned int iphdroff,
 	return true;
 }
 
-static const struct nf_nat_protocol gre = {
-	.protonum		= IPPROTO_GRE,
+static const struct nf_nat_l4proto gre = {
+	.l4proto		= IPPROTO_GRE,
 	.manip_pkt		= gre_manip_pkt,
-	.in_range		= nf_nat_proto_in_range,
+	.in_range		= nf_nat_l4proto_in_range,
 	.unique_tuple		= gre_unique_tuple,
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
-	.nlattr_to_range	= nf_nat_proto_nlattr_to_range,
+	.nlattr_to_range	= nf_nat_l4proto_nlattr_to_range,
 #endif
 };
 
 static int __init nf_nat_proto_gre_init(void)
 {
-	return nf_nat_protocol_register(&gre);
+	return nf_nat_l4proto_register(NFPROTO_IPV4, &gre);
 }
 
 static void __exit nf_nat_proto_gre_fini(void)
 {
-	nf_nat_protocol_unregister(&gre);
+	nf_nat_l4proto_unregister(NFPROTO_IPV4, &gre);
 }
 
 module_init(nf_nat_proto_gre_init);

net/ipv4/netfilter/nf_nat_proto_icmp.c

@@ -15,8 +15,7 @@
 #include <linux/netfilter.h>
 #include <net/netfilter/nf_nat.h>
 #include <net/netfilter/nf_nat_core.h>
-#include <net/netfilter/nf_nat_rule.h>
-#include <net/netfilter/nf_nat_protocol.h>
+#include <net/netfilter/nf_nat_l4proto.h>
 
 static bool
 icmp_in_range(const struct nf_conntrack_tuple *tuple,
@@ -29,8 +28,9 @@ icmp_in_range(const struct nf_conntrack_tuple *tuple,
 }
 
 static void
-icmp_unique_tuple(struct nf_conntrack_tuple *tuple,
-		  const struct nf_nat_ipv4_range *range,
+icmp_unique_tuple(const struct nf_nat_l3proto *l3proto,
+		  struct nf_conntrack_tuple *tuple,
+		  const struct nf_nat_range *range,
 		  enum nf_nat_manip_type maniptype,
 		  const struct nf_conn *ct)
 {
@@ -38,13 +38,14 @@ icmp_unique_tuple(struct nf_conntrack_tuple *tuple,
 	unsigned int range_size;
 	unsigned int i;
 
-	range_size = ntohs(range->max.icmp.id) - ntohs(range->min.icmp.id) + 1;
+	range_size = ntohs(range->max_proto.icmp.id) -
+		     ntohs(range->min_proto.icmp.id) + 1;
 	/* If no range specified... */
 	if (!(range->flags & NF_NAT_RANGE_PROTO_SPECIFIED))
 		range_size = 0xFFFF;
 
 	for (i = 0; ; ++id) {
-		tuple->src.u.icmp.id = htons(ntohs(range->min.icmp.id) +
+		tuple->src.u.icmp.id = htons(ntohs(range->min_proto.icmp.id) +
 					     (id % range_size));
 		if (++i == range_size || !nf_nat_used_tuple(tuple, ct))
 			return;
@@ -54,13 +55,12 @@ icmp_unique_tuple(struct nf_conntrack_tuple *tuple,
 
 static bool
 icmp_manip_pkt(struct sk_buff *skb,
-	       unsigned int iphdroff,
+	       const struct nf_nat_l3proto *l3proto,
+	       unsigned int iphdroff, unsigned int hdroff,
 	       const struct nf_conntrack_tuple *tuple,
 	       enum nf_nat_manip_type maniptype)
 {
-	const struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
 	struct icmphdr *hdr;
-	unsigned int hdroff = iphdroff + iph->ihl*4;
 
 	if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
 		return false;
@@ -72,12 +72,12 @@ icmp_manip_pkt(struct sk_buff *skb,
 	return true;
 }
 
-const struct nf_nat_protocol nf_nat_protocol_icmp = {
-	.protonum		= IPPROTO_ICMP,
+const struct nf_nat_l4proto nf_nat_l4proto_icmp = {
+	.l4proto		= IPPROTO_ICMP,
 	.manip_pkt		= icmp_manip_pkt,
 	.in_range		= icmp_in_range,
 	.unique_tuple		= icmp_unique_tuple,
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
-	.nlattr_to_range	= nf_nat_proto_nlattr_to_range,
+	.nlattr_to_range	= nf_nat_l4proto_nlattr_to_range,
 #endif
 };

net/ipv4/netfilter/nf_nat_rule.c

-/* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2006 Netfilter Core Team <coreteam@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.
- */
-
-/* Everything about the rules for NAT. */
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/types.h>
-#include <linux/ip.h>
-#include <linux/netfilter.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/module.h>
-#include <linux/kmod.h>
-#include <linux/skbuff.h>
-#include <linux/proc_fs.h>
-#include <linux/slab.h>
-#include <net/checksum.h>
-#include <net/route.h>
-#include <linux/bitops.h>
-
-#include <linux/netfilter_ipv4/ip_tables.h>
-#include <net/netfilter/nf_nat.h>
-#include <net/netfilter/nf_nat_core.h>
-#include <net/netfilter/nf_nat_rule.h>
-
-#define NAT_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | \
-			 (1 << NF_INET_POST_ROUTING) | \
-			 (1 << NF_INET_LOCAL_OUT) | \
-			 (1 << NF_INET_LOCAL_IN))
-
-static const struct xt_table nat_table = {
-	.name		= "nat",
-	.valid_hooks	= NAT_VALID_HOOKS,
-	.me		= THIS_MODULE,
-	.af		= NFPROTO_IPV4,
-};
-
-/* Source NAT */
-static unsigned int
-ipt_snat_target(struct sk_buff *skb, const struct xt_action_param *par)
-{
-	struct nf_conn *ct;
-	enum ip_conntrack_info ctinfo;
-	const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
-
-	NF_CT_ASSERT(par->hooknum == NF_INET_POST_ROUTING ||
-		     par->hooknum == NF_INET_LOCAL_IN);
-
-	ct = nf_ct_get(skb, &ctinfo);
-
-	/* Connection must be valid and new. */
-	NF_CT_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED ||
-			    ctinfo == IP_CT_RELATED_REPLY));
-	NF_CT_ASSERT(par->out != NULL);
-
-	return nf_nat_setup_info(ct, &mr->range[0], NF_NAT_MANIP_SRC);
-}
-
-static unsigned int
-ipt_dnat_target(struct sk_buff *skb, const struct xt_action_param *par)
-{
-	struct nf_conn *ct;
-	enum ip_conntrack_info ctinfo;
-	const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
-
-	NF_CT_ASSERT(par->hooknum == NF_INET_PRE_ROUTING ||
-		     par->hooknum == NF_INET_LOCAL_OUT);
-
-	ct = nf_ct_get(skb, &ctinfo);
-
-	/* Connection must be valid and new. */
-	NF_CT_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED));
-
-	return nf_nat_setup_info(ct, &mr->range[0], NF_NAT_MANIP_DST);
-}
-
-static int ipt_snat_checkentry(const struct xt_tgchk_param *par)
-{
-	const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
-
-	/* Must be a valid range */
-	if (mr->rangesize != 1) {
-		pr_info("SNAT: multiple ranges no longer supported\n");
-		return -EINVAL;
-	}
-	return 0;
-}
-
-static int ipt_dnat_checkentry(const struct xt_tgchk_param *par)
-{
-	const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
-
-	/* Must be a valid range */
-	if (mr->rangesize != 1) {
-		pr_info("DNAT: multiple ranges no longer supported\n");
-		return -EINVAL;
-	}
-	return 0;
-}
-
-static unsigned int
-alloc_null_binding(struct nf_conn *ct, unsigned int hooknum)
-{
-	/* Force range to this IP; let proto decide mapping for
-	   per-proto parts (hence not NF_NAT_RANGE_PROTO_SPECIFIED).
-	*/
-	struct nf_nat_ipv4_range range;
-
-	range.flags = 0;
-	pr_debug("Allocating NULL binding for %p (%pI4)\n", ct,
-		 HOOK2MANIP(hooknum) == NF_NAT_MANIP_SRC ?
-		 &ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip :
-		 &ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3.ip);
-
-	return nf_nat_setup_info(ct, &range, HOOK2MANIP(hooknum));
-}
-
-int nf_nat_rule_find(struct sk_buff *skb,
-		     unsigned int hooknum,
-		     const struct net_device *in,
-		     const struct net_device *out,
-		     struct nf_conn *ct)
-{
-	struct net *net = nf_ct_net(ct);
-	int ret;
-
-	ret = ipt_do_table(skb, hooknum, in, out, net->ipv4.nat_table);
-
-	if (ret == NF_ACCEPT) {
-		if (!nf_nat_initialized(ct, HOOK2MANIP(hooknum)))
-			/* NUL mapping */
-			ret = alloc_null_binding(ct, hooknum);
-	}
-	return ret;
-}
-
-static struct xt_target ipt_snat_reg __read_mostly = {
-	.name		= "SNAT",
-	.target		= ipt_snat_target,
-	.targetsize	= sizeof(struct nf_nat_ipv4_multi_range_compat),
-	.table		= "nat",
-	.hooks		= (1 << NF_INET_POST_ROUTING) | (1 << NF_INET_LOCAL_IN),
-	.checkentry	= ipt_snat_checkentry,
-	.family		= AF_INET,
-};
-
-static struct xt_target ipt_dnat_reg __read_mostly = {
-	.name		= "DNAT",
-	.target		= ipt_dnat_target,
-	.targetsize	= sizeof(struct nf_nat_ipv4_multi_range_compat),
-	.table		= "nat",
-	.hooks		= (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT),
-	.checkentry	= ipt_dnat_checkentry,
-	.family		= AF_INET,
-};
-
-static int __net_init nf_nat_rule_net_init(struct net *net)
-{
-	struct ipt_replace *repl;
-
-	repl = ipt_alloc_initial_table(&nat_table);
-	if (repl == NULL)
-		return -ENOMEM;
-	net->ipv4.nat_table = ipt_register_table(net, &nat_table, repl);
-	kfree(repl);
-	if (IS_ERR(net->ipv4.nat_table))
-		return PTR_ERR(net->ipv4.nat_table);
-	return 0;
-}
-
-static void __net_exit nf_nat_rule_net_exit(struct net *net)
-{
-	ipt_unregister_table(net, net->ipv4.nat_table);
-}
-
-static struct pernet_operations nf_nat_rule_net_ops = {
-	.init = nf_nat_rule_net_init,
-	.exit = nf_nat_rule_net_exit,
-};
-
-int __init nf_nat_rule_init(void)
-{
-	int ret;
-
-	ret = register_pernet_subsys(&nf_nat_rule_net_ops);
-	if (ret != 0)
-		goto out;
-	ret = xt_register_target(&ipt_snat_reg);
-	if (ret != 0)
-		goto unregister_table;
-
-	ret = xt_register_target(&ipt_dnat_reg);
-	if (ret != 0)
-		goto unregister_snat;
-
-	return ret;
-
- unregister_snat:
-	xt_unregister_target(&ipt_snat_reg);
- unregister_table:
-	unregister_pernet_subsys(&nf_nat_rule_net_ops);
- out:
-	return ret;
-}
-
-void nf_nat_rule_cleanup(void)
-{
-	xt_unregister_target(&ipt_dnat_reg);
-	xt_unregister_target(&ipt_snat_reg);
-	unregister_pernet_subsys(&nf_nat_rule_net_ops);
-}

net/ipv4/netfilter/nf_nat_sip.c

@@ -19,7 +19,6 @@
 
 #include <net/netfilter/nf_nat.h>
 #include <net/netfilter/nf_nat_helper.h>
-#include <net/netfilter/nf_nat_rule.h>
 #include <net/netfilter/nf_conntrack_helper.h>
 #include <net/netfilter/nf_conntrack_expect.h>
 #include <linux/netfilter/nf_conntrack_sip.h>
@@ -255,15 +254,15 @@ static void ip_nat_sip_seq_adjust(struct sk_buff *skb, s16 off)
 static void ip_nat_sip_expected(struct nf_conn *ct,
 				struct nf_conntrack_expect *exp)
 {
-	struct nf_nat_ipv4_range range;
+	struct nf_nat_range range;
 
 	/* This must be a fresh one. */
 	BUG_ON(ct->status & IPS_NAT_DONE_MASK);
 
 	/* For DST manip, map port here to where it's expected. */
 	range.flags = (NF_NAT_RANGE_MAP_IPS | NF_NAT_RANGE_PROTO_SPECIFIED);
-	range.min = range.max = exp->saved_proto;
-	range.min_ip = range.max_ip = exp->saved_ip;
+	range.min_proto = range.max_proto = exp->saved_proto;
+	range.min_addr = range.max_addr = exp->saved_addr;
 	nf_nat_setup_info(ct, &range, NF_NAT_MANIP_DST);
 
 	/* Change src to where master sends to, but only if the connection
@@ -271,8 +270,8 @@ static void ip_nat_sip_expected(struct nf_conn *ct,
 	if (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip ==
 	    ct->master->tuplehash[exp->dir].tuple.src.u3.ip) {
 		range.flags = NF_NAT_RANGE_MAP_IPS;
-		range.min_ip = range.max_ip
-			= ct->master->tuplehash[!exp->dir].tuple.dst.u3.ip;
+		range.min_addr = range.max_addr
+			= ct->master->tuplehash[!exp->dir].tuple.dst.u3;
 		nf_nat_setup_info(ct, &range, NF_NAT_MANIP_SRC);
 	}
 }
@@ -307,7 +306,7 @@ static unsigned int ip_nat_sip_expect(struct sk_buff *skb, unsigned int protoff,
 	else
 		port = ntohs(exp->tuple.dst.u.udp.port);
 
-	exp->saved_ip = exp->tuple.dst.u3.ip;
+	exp->saved_addr = exp->tuple.dst.u3;
 	exp->tuple.dst.u3.ip = newip;
 	exp->saved_proto.udp.port = exp->tuple.dst.u.udp.port;
 	exp->dir = !dir;
@@ -329,7 +328,7 @@ static unsigned int ip_nat_sip_expect(struct sk_buff *skb, unsigned int protoff,
 	if (port == 0)
 		return NF_DROP;
 
-	if (exp->tuple.dst.u3.ip != exp->saved_ip ||
+	if (exp->tuple.dst.u3.ip != exp->saved_addr.ip ||
 	    exp->tuple.dst.u.udp.port != exp->saved_proto.udp.port) {
 		buflen = sprintf(buffer, "%pI4:%u", &newip, port);
 		if (!mangle_packet(skb, protoff, dataoff, dptr, datalen,
@@ -485,13 +484,13 @@ static unsigned int ip_nat_sdp_media(struct sk_buff *skb, unsigned int protoff,
 	else
 		rtp_addr->ip = ct->tuplehash[!dir].tuple.dst.u3.ip;
 
-	rtp_exp->saved_ip = rtp_exp->tuple.dst.u3.ip;
+	rtp_exp->saved_addr = rtp_exp->tuple.dst.u3;
 	rtp_exp->tuple.dst.u3.ip = rtp_addr->ip;
 	rtp_exp->saved_proto.udp.port = rtp_exp->tuple.dst.u.udp.port;
 	rtp_exp->dir = !dir;
 	rtp_exp->expectfn = ip_nat_sip_expected;
 
-	rtcp_exp->saved_ip = rtcp_exp->tuple.dst.u3.ip;
+	rtcp_exp->saved_addr = rtcp_exp->tuple.dst.u3;
 	rtcp_exp->tuple.dst.u3.ip = rtp_addr->ip;
 	rtcp_exp->saved_proto.udp.port = rtcp_exp->tuple.dst.u.udp.port;
 	rtcp_exp->dir = !dir;

net/ipv4/netfilter/nf_nat_tftp.c

@@ -11,7 +11,6 @@
 #include <net/netfilter/nf_conntrack_helper.h>
 #include <net/netfilter/nf_conntrack_expect.h>
 #include <net/netfilter/nf_nat_helper.h>
-#include <net/netfilter/nf_nat_rule.h>
 #include <linux/netfilter/nf_conntrack_tftp.h>
 
 MODULE_AUTHOR("Magnus Boden <mb@ozaba.mine.nu>");

net/netfilter/Kconfig

@@ -356,6 +356,30 @@ config NETFILTER_NETLINK_QUEUE_CT
 	  If this option is enabled, NFQUEUE can include Connection Tracking
 	  information together with the packet is the enqueued via NFNETLINK.
 
+config NF_NAT
+	tristate
+
+config NF_NAT_NEEDED
+	bool
+	depends on NF_NAT
+	default y
+
+config NF_NAT_PROTO_DCCP
+	tristate
+	depends on NF_NAT && NF_CT_PROTO_DCCP
+	default NF_NAT && NF_CT_PROTO_DCCP
+
+config NF_NAT_PROTO_UDPLITE
+	tristate
+	depends on NF_NAT && NF_CT_PROTO_UDPLITE
+	default NF_NAT && NF_CT_PROTO_UDPLITE
+
+config NF_NAT_PROTO_SCTP
+	tristate
+	default NF_NAT && NF_CT_PROTO_SCTP
+	depends on NF_NAT && NF_CT_PROTO_SCTP
+	select LIBCRC32C
+
 endif # NF_CONNTRACK
 
 # transparent proxy support

net/netfilter/Makefile

@@ -43,6 +43,17 @@ obj-$(CONFIG_NF_CONNTRACK_SANE) += nf_conntrack_sane.o
 obj-$(CONFIG_NF_CONNTRACK_SIP) += nf_conntrack_sip.o
 obj-$(CONFIG_NF_CONNTRACK_TFTP) += nf_conntrack_tftp.o
 
+nf_nat-y	:= nf_nat_core.o nf_nat_proto_unknown.o nf_nat_proto_common.o \
+		   nf_nat_proto_udp.o nf_nat_proto_tcp.o nf_nat_helper.o
+
+obj-$(CONFIG_NF_NAT) += nf_nat.o
+obj-$(CONFIG_NF_NAT) += xt_nat.o
+
+# NAT protocols (nf_nat)
+obj-$(CONFIG_NF_NAT_PROTO_DCCP) += nf_nat_proto_dccp.o
+obj-$(CONFIG_NF_NAT_PROTO_UDPLITE) += nf_nat_proto_udplite.o
+obj-$(CONFIG_NF_NAT_PROTO_SCTP) += nf_nat_proto_sctp.o
+
 # transparent proxy support
 obj-$(CONFIG_NETFILTER_TPROXY) += nf_tproxy_core.o
 

net/netfilter/core.c

@@ -275,6 +275,11 @@ EXPORT_SYMBOL_GPL(nfq_ct_nat_hook);
 
 #endif /* CONFIG_NF_CONNTRACK */
 
+#ifdef CONFIG_NF_NAT_NEEDED
+void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *);
+EXPORT_SYMBOL(nf_nat_decode_session_hook);
+#endif
+
 #ifdef CONFIG_PROC_FS
 struct proc_dir_entry *proc_net_netfilter;
 EXPORT_SYMBOL(proc_net_netfilter);

net/netfilter/nf_conntrack_core.c

@@ -55,6 +55,12 @@ int (*nfnetlink_parse_nat_setup_hook)(struct nf_conn *ct,
 				      const struct nlattr *attr) __read_mostly;
 EXPORT_SYMBOL_GPL(nfnetlink_parse_nat_setup_hook);
 
+int (*nf_nat_seq_adjust_hook)(struct sk_buff *skb,
+			      struct nf_conn *ct,
+			      enum ip_conntrack_info ctinfo,
+			      unsigned int protoff);
+EXPORT_SYMBOL_GPL(nf_nat_seq_adjust_hook);
+
 DEFINE_SPINLOCK(nf_conntrack_lock);
 EXPORT_SYMBOL_GPL(nf_conntrack_lock);
 

net/netfilter/nf_conntrack_netlink.c

@@ -45,7 +45,7 @@
 #include <net/netfilter/nf_conntrack_timestamp.h>
 #ifdef CONFIG_NF_NAT_NEEDED
 #include <net/netfilter/nf_nat_core.h>
-#include <net/netfilter/nf_nat_protocol.h>
+#include <net/netfilter/nf_nat_l4proto.h>
 #include <net/netfilter/nf_nat_helper.h>
 #endif
 
@@ -1096,13 +1096,14 @@ ctnetlink_parse_nat_setup(struct nf_conn *ct,
 			  const struct nlattr *attr)
 {
 	typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
+	int err;
 
 	parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
 	if (!parse_nat_setup) {
 #ifdef CONFIG_MODULES
 		rcu_read_unlock();
 		nfnl_unlock();
-		if (request_module("nf-nat-ipv4") < 0) {
+		if (request_module("nf-nat") < 0) {
 			nfnl_lock();
 			rcu_read_lock();
 			return -EOPNOTSUPP;
@@ -1115,7 +1116,26 @@ ctnetlink_parse_nat_setup(struct nf_conn *ct,
 		return -EOPNOTSUPP;
 	}
 
-	return parse_nat_setup(ct, manip, attr);
+	err = parse_nat_setup(ct, manip, attr);
+	if (err == -EAGAIN) {
+#ifdef CONFIG_MODULES
+		rcu_read_unlock();
+		spin_unlock_bh(&nf_conntrack_lock);
+		nfnl_unlock();
+		if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
+			nfnl_lock();
+			spin_lock_bh(&nf_conntrack_lock);
+			rcu_read_lock();
+			return -EOPNOTSUPP;
+		}
+		nfnl_lock();
+		spin_lock_bh(&nf_conntrack_lock);
+		rcu_read_lock();
+#else
+		err = -EOPNOTSUPP;
+#endif
+	}
+	return err;
 }
 #endif
 
@@ -1979,6 +1999,8 @@ ctnetlink_exp_dump_mask(struct sk_buff *skb,
 	return -1;
 }
 
+static const union nf_inet_addr any_addr;
+
 static int
 ctnetlink_exp_dump_expect(struct sk_buff *skb,
 			  const struct nf_conntrack_expect *exp)
@@ -2005,7 +2027,8 @@ ctnetlink_exp_dump_expect(struct sk_buff *skb,
 		goto nla_put_failure;
 
 #ifdef CONFIG_NF_NAT_NEEDED
-	if (exp->saved_ip || exp->saved_proto.all) {
+	if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
+	    exp->saved_proto.all) {
 		nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
 		if (!nest_parms)
 			goto nla_put_failure;
@@ -2014,7 +2037,7 @@ ctnetlink_exp_dump_expect(struct sk_buff *skb,
 			goto nla_put_failure;
 
 		nat_tuple.src.l3num = nf_ct_l3num(master);
-		nat_tuple.src.u3.ip = exp->saved_ip;
+		nat_tuple.src.u3 = exp->saved_addr;
 		nat_tuple.dst.protonum = nf_ct_protonum(master);
 		nat_tuple.src.u = exp->saved_proto;
 
@@ -2410,7 +2433,7 @@ ctnetlink_parse_expect_nat(const struct nlattr *attr,
 	if (err < 0)
 		return err;
 
-	exp->saved_ip = nat_tuple.src.u3.ip;
+	exp->saved_addr = nat_tuple.src.u3;
 	exp->saved_proto = nat_tuple.src.u;
 	exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
 

net/netfilter/nf_conntrack_proto_tcp.c

@@ -505,10 +505,10 @@ static inline s16 nat_offset(const struct nf_conn *ct,
 
 	return get_offset != NULL ? get_offset(ct, dir, seq) : 0;
 }
-#define NAT_OFFSET(pf, ct, dir, seq) \
-	(pf == NFPROTO_IPV4 ? nat_offset(ct, dir, seq) : 0)
+#define NAT_OFFSET(ct, dir, seq) \
+	(nat_offset(ct, dir, seq))
 #else
-#define NAT_OFFSET(pf, ct, dir, seq)	0
+#define NAT_OFFSET(ct, dir, seq)	0
 #endif
 
 static bool tcp_in_window(const struct nf_conn *ct,
@@ -541,7 +541,7 @@ static bool tcp_in_window(const struct nf_conn *ct,
 		tcp_sack(skb, dataoff, tcph, &sack);
 
 	/* Take into account NAT sequence number mangling */
-	receiver_offset = NAT_OFFSET(pf, ct, !dir, ack - 1);
+	receiver_offset = NAT_OFFSET(ct, !dir, ack - 1);
 	ack -= receiver_offset;
 	sack -= receiver_offset;
 

net/netfilter/nf_conntrack_sip.c

@@ -946,11 +946,11 @@ static int set_expected_rtp_rtcp(struct sk_buff *skb, unsigned int protoff,
 			break;
 #ifdef CONFIG_NF_NAT_NEEDED
 		if (exp->tuple.src.l3num == AF_INET && !direct_rtp &&
-		    (exp->saved_ip != exp->tuple.dst.u3.ip ||
+		    (exp->saved_addr.ip != exp->tuple.dst.u3.ip ||
 		     exp->saved_proto.udp.port != exp->tuple.dst.u.udp.port) &&
 		    ct->status & IPS_NAT_MASK) {
-			daddr->ip		= exp->saved_ip;
-			tuple.dst.u3.ip		= exp->saved_ip;
+			daddr->ip		= exp->saved_addr.ip;
+			tuple.dst.u3.ip		= exp->saved_addr.ip;
 			tuple.dst.u.udp.port	= exp->saved_proto.udp.port;
 			direct_rtp = 1;
 		} else

net/ipv4/netfilter/nf_nat_helper.c → net/netfilter/nf_nat_helper.c

-/* ip_nat_helper.c - generic support functions for NAT helpers
+/* nf_nat_helper.c - generic support functions for NAT helpers
  *
  * (C) 2000-2002 Harald Welte <laforge@netfilter.org>
  * (C) 2003-2006 Netfilter Core Team <coreteam@netfilter.org>
@@ -9,23 +9,19 @@
  */
 #include <linux/module.h>
 #include <linux/gfp.h>
-#include <linux/kmod.h>
 #include <linux/types.h>
-#include <linux/timer.h>
 #include <linux/skbuff.h>
 #include <linux/tcp.h>
 #include <linux/udp.h>
-#include <net/checksum.h>
 #include <net/tcp.h>
-#include <net/route.h>
 
-#include <linux/netfilter_ipv4.h>
 #include <net/netfilter/nf_conntrack.h>
 #include <net/netfilter/nf_conntrack_helper.h>
 #include <net/netfilter/nf_conntrack_ecache.h>
 #include <net/netfilter/nf_conntrack_expect.h>
 #include <net/netfilter/nf_nat.h>
-#include <net/netfilter/nf_nat_protocol.h>
+#include <net/netfilter/nf_nat_l3proto.h>
+#include <net/netfilter/nf_nat_l4proto.h>
 #include <net/netfilter/nf_nat_core.h>
 #include <net/netfilter/nf_nat_helper.h>
 
@@ -90,7 +86,6 @@ s16 nf_nat_get_offset(const struct nf_conn *ct,
 
 	return offset;
 }
-EXPORT_SYMBOL_GPL(nf_nat_get_offset);
 
 /* Frobs data inside this packet, which is linear. */
 static void mangle_contents(struct sk_buff *skb,
@@ -125,9 +120,13 @@ static void mangle_contents(struct sk_buff *skb,
 		__skb_trim(skb, skb->len + rep_len - match_len);
 	}
 
-	/* fix IP hdr checksum information */
-	ip_hdr(skb)->tot_len = htons(skb->len);
-	ip_send_check(ip_hdr(skb));
+	if (nf_ct_l3num((struct nf_conn *)skb->nfct) == NFPROTO_IPV4) {
+		/* fix IP hdr checksum information */
+		ip_hdr(skb)->tot_len = htons(skb->len);
+		ip_send_check(ip_hdr(skb));
+	} else
+		ipv6_hdr(skb)->payload_len =
+			htons(skb->len - sizeof(struct ipv6hdr));
 }
 
 /* Unusual, but possible case. */
@@ -166,35 +165,6 @@ void nf_nat_tcp_seq_adjust(struct sk_buff *skb, struct nf_conn *ct,
 }
 EXPORT_SYMBOL_GPL(nf_nat_tcp_seq_adjust);
 
-static void nf_nat_csum(struct sk_buff *skb, const struct iphdr *iph, void *data,
-			int datalen, __sum16 *check, int oldlen)
-{
-	struct rtable *rt = skb_rtable(skb);
-
-	if (skb->ip_summed != CHECKSUM_PARTIAL) {
-		if (!(rt->rt_flags & RTCF_LOCAL) &&
-		    (!skb->dev || skb->dev->features & NETIF_F_V4_CSUM)) {
-			skb->ip_summed = CHECKSUM_PARTIAL;
-			skb->csum_start = skb_headroom(skb) +
-					  skb_network_offset(skb) +
-					  iph->ihl * 4;
-			skb->csum_offset = (void *)check - data;
-			*check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
-						    datalen, iph->protocol, 0);
-		} else {
-			*check = 0;
-			*check = csum_tcpudp_magic(iph->saddr, iph->daddr,
-						   datalen, iph->protocol,
-						   csum_partial(data, datalen,
-								0));
-			if (iph->protocol == IPPROTO_UDP && !*check)
-				*check = CSUM_MANGLED_0;
-		}
-	} else
-		inet_proto_csum_replace2(check, skb,
-					 htons(oldlen), htons(datalen), 1);
-}
-
 /* Generic function for mangling variable-length address changes inside
  * NATed TCP connections (like the PORT XXX,XXX,XXX,XXX,XXX,XXX
  * command in FTP).
@@ -212,7 +182,7 @@ int __nf_nat_mangle_tcp_packet(struct sk_buff *skb,
 			       const char *rep_buffer,
 			       unsigned int rep_len, bool adjust)
 {
-	struct iphdr *iph;
+	const struct nf_nat_l3proto *l3proto;
 	struct tcphdr *tcph;
 	int oldlen, datalen;
 
@@ -226,15 +196,17 @@ int __nf_nat_mangle_tcp_packet(struct sk_buff *skb,
 
 	SKB_LINEAR_ASSERT(skb);
 
-	iph = ip_hdr(skb);
-	tcph = (void *)iph + iph->ihl*4;
+	tcph = (void *)skb->data + protoff;
 
-	oldlen = skb->len - iph->ihl*4;
-	mangle_contents(skb, iph->ihl*4 + tcph->doff*4,
+	oldlen = skb->len - protoff;
+	mangle_contents(skb, protoff + tcph->doff*4,
 			match_offset, match_len, rep_buffer, rep_len);
 
-	datalen = skb->len - iph->ihl*4;
-	nf_nat_csum(skb, iph, tcph, datalen, &tcph->check, oldlen);
+	datalen = skb->len - protoff;
+
+	l3proto = __nf_nat_l3proto_find(nf_ct_l3num(ct));
+	l3proto->csum_recalc(skb, IPPROTO_TCP, tcph, &tcph->check,
+			     datalen, oldlen);
 
 	if (adjust && rep_len != match_len)
 		nf_nat_set_seq_adjust(ct, ctinfo, tcph->seq,
@@ -264,7 +236,7 @@ nf_nat_mangle_udp_packet(struct sk_buff *skb,
 			 const char *rep_buffer,
 			 unsigned int rep_len)
 {
-	struct iphdr *iph;
+	const struct nf_nat_l3proto *l3proto;
 	struct udphdr *udph;
 	int datalen, oldlen;
 
@@ -276,22 +248,23 @@ nf_nat_mangle_udp_packet(struct sk_buff *skb,
 	    !enlarge_skb(skb, rep_len - match_len))
 		return 0;
 
-	iph = ip_hdr(skb);
-	udph = (void *)iph + iph->ihl*4;
+	udph = (void *)skb->data + protoff;
 
-	oldlen = skb->len - iph->ihl*4;
-	mangle_contents(skb, iph->ihl*4 + sizeof(*udph),
+	oldlen = skb->len - protoff;
+	mangle_contents(skb, protoff + sizeof(*udph),
 			match_offset, match_len, rep_buffer, rep_len);
 
 	/* update the length of the UDP packet */
-	datalen = skb->len - iph->ihl*4;
+	datalen = skb->len - protoff;
 	udph->len = htons(datalen);
 
 	/* fix udp checksum if udp checksum was previously calculated */
 	if (!udph->check && skb->ip_summed != CHECKSUM_PARTIAL)
 		return 1;
 
-	nf_nat_csum(skb, iph, udph, datalen, &udph->check, oldlen);
+	l3proto = __nf_nat_l3proto_find(nf_ct_l3num(ct));
+	l3proto->csum_recalc(skb, IPPROTO_UDP, udph, &udph->check,
+			     datalen, oldlen);
 
 	return 1;
 }
@@ -343,6 +316,7 @@ sack_adjust(struct sk_buff *skb,
 /* TCP SACK sequence number adjustment */
 static inline unsigned int
 nf_nat_sack_adjust(struct sk_buff *skb,
+		   unsigned int protoff,
 		   struct tcphdr *tcph,
 		   struct nf_conn *ct,
 		   enum ip_conntrack_info ctinfo)
@@ -350,8 +324,8 @@ nf_nat_sack_adjust(struct sk_buff *skb,
 	unsigned int dir, optoff, optend;
 	struct nf_conn_nat *nat = nfct_nat(ct);
 
-	optoff = ip_hdrlen(skb) + sizeof(struct tcphdr);
-	optend = ip_hdrlen(skb) + tcph->doff * 4;
+	optoff = protoff + sizeof(struct tcphdr);
+	optend = protoff + tcph->doff * 4;
 
 	if (!skb_make_writable(skb, optend))
 		return 0;
@@ -432,7 +406,7 @@ nf_nat_seq_adjust(struct sk_buff *skb,
 	tcph->seq = newseq;
 	tcph->ack_seq = newack;
 
-	return nf_nat_sack_adjust(skb, tcph, ct, ctinfo);
+	return nf_nat_sack_adjust(skb, protoff, tcph, ct, ctinfo);
 }
 
 /* Setup NAT on this expected conntrack so it follows master. */
@@ -440,22 +414,22 @@ nf_nat_seq_adjust(struct sk_buff *skb,
 void nf_nat_follow_master(struct nf_conn *ct,
 			  struct nf_conntrack_expect *exp)
 {
-	struct nf_nat_ipv4_range range;
+	struct nf_nat_range range;
 
 	/* This must be a fresh one. */
 	BUG_ON(ct->status & IPS_NAT_DONE_MASK);
 
 	/* Change src to where master sends to */
 	range.flags = NF_NAT_RANGE_MAP_IPS;
-	range.min_ip = range.max_ip
-		= ct->master->tuplehash[!exp->dir].tuple.dst.u3.ip;
+	range.min_addr = range.max_addr
+		= ct->master->tuplehash[!exp->dir].tuple.dst.u3;
 	nf_nat_setup_info(ct, &range, NF_NAT_MANIP_SRC);
 
 	/* For DST manip, map port here to where it's expected. */
 	range.flags = (NF_NAT_RANGE_MAP_IPS | NF_NAT_RANGE_PROTO_SPECIFIED);
-	range.min = range.max = exp->saved_proto;
-	range.min_ip = range.max_ip
-		= ct->master->tuplehash[!exp->dir].tuple.src.u3.ip;
+	range.min_proto = range.max_proto = exp->saved_proto;
+	range.min_addr = range.max_addr
+		= ct->master->tuplehash[!exp->dir].tuple.src.u3;
 	nf_nat_setup_info(ct, &range, NF_NAT_MANIP_DST);
 }
 EXPORT_SYMBOL(nf_nat_follow_master);

net/ipv4/netfilter/nf_nat_proto_common.c → net/netfilter/nf_nat_proto_common.c

@@ -9,20 +9,18 @@
 
 #include <linux/types.h>
 #include <linux/random.h>
-#include <linux/ip.h>
-
 #include <linux/netfilter.h>
 #include <linux/export.h>
-#include <net/secure_seq.h>
+
 #include <net/netfilter/nf_nat.h>
 #include <net/netfilter/nf_nat_core.h>
-#include <net/netfilter/nf_nat_rule.h>
-#include <net/netfilter/nf_nat_protocol.h>
+#include <net/netfilter/nf_nat_l3proto.h>
+#include <net/netfilter/nf_nat_l4proto.h>
 
-bool nf_nat_proto_in_range(const struct nf_conntrack_tuple *tuple,
-			   enum nf_nat_manip_type maniptype,
-			   const union nf_conntrack_man_proto *min,
-			   const union nf_conntrack_man_proto *max)
+bool nf_nat_l4proto_in_range(const struct nf_conntrack_tuple *tuple,
+			     enum nf_nat_manip_type maniptype,
+			     const union nf_conntrack_man_proto *min,
+			     const union nf_conntrack_man_proto *max)
 {
 	__be16 port;
 
@@ -34,13 +32,14 @@ bool nf_nat_proto_in_range(const struct nf_conntrack_tuple *tuple,
 	return ntohs(port) >= ntohs(min->all) &&
 	       ntohs(port) <= ntohs(max->all);
 }
-EXPORT_SYMBOL_GPL(nf_nat_proto_in_range);
+EXPORT_SYMBOL_GPL(nf_nat_l4proto_in_range);
 
-void nf_nat_proto_unique_tuple(struct nf_conntrack_tuple *tuple,
-			       const struct nf_nat_ipv4_range *range,
-			       enum nf_nat_manip_type maniptype,
-			       const struct nf_conn *ct,
-			       u_int16_t *rover)
+void nf_nat_l4proto_unique_tuple(const struct nf_nat_l3proto *l3proto,
+				 struct nf_conntrack_tuple *tuple,
+				 const struct nf_nat_range *range,
+				 enum nf_nat_manip_type maniptype,
+				 const struct nf_conn *ct,
+				 u16 *rover)
 {
 	unsigned int range_size, min, i;
 	__be16 *portptr;
@@ -71,15 +70,14 @@ void nf_nat_proto_unique_tuple(struct nf_conntrack_tuple *tuple,
 			range_size = 65535 - 1024 + 1;
 		}
 	} else {
-		min = ntohs(range->min.all);
-		range_size = ntohs(range->max.all) - min + 1;
+		min = ntohs(range->min_proto.all);
+		range_size = ntohs(range->max_proto.all) - min + 1;
 	}
 
 	if (range->flags & NF_NAT_RANGE_PROTO_RANDOM)
-		off = secure_ipv4_port_ephemeral(tuple->src.u3.ip, tuple->dst.u3.ip,
-						 maniptype == NF_NAT_MANIP_SRC
-						 ? tuple->dst.u.all
-						 : tuple->src.u.all);
+		off = l3proto->secure_port(tuple, maniptype == NF_NAT_MANIP_SRC
+						  ? tuple->dst.u.all
+						  : tuple->src.u.all);
 	else
 		off = *rover;
 
@@ -93,22 +91,22 @@ void nf_nat_proto_unique_tuple(struct nf_conntrack_tuple *tuple,
 	}
 	return;
 }
-EXPORT_SYMBOL_GPL(nf_nat_proto_unique_tuple);
+EXPORT_SYMBOL_GPL(nf_nat_l4proto_unique_tuple);
 
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
-int nf_nat_proto_nlattr_to_range(struct nlattr *tb[],
-				 struct nf_nat_ipv4_range *range)
+int nf_nat_l4proto_nlattr_to_range(struct nlattr *tb[],
+				   struct nf_nat_range *range)
 {
 	if (tb[CTA_PROTONAT_PORT_MIN]) {
-		range->min.all = nla_get_be16(tb[CTA_PROTONAT_PORT_MIN]);
-		range->max.all = range->min.tcp.port;
+		range->min_proto.all = nla_get_be16(tb[CTA_PROTONAT_PORT_MIN]);
+		range->max_proto.all = range->min_proto.all;
 		range->flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
 	}
 	if (tb[CTA_PROTONAT_PORT_MAX]) {
-		range->max.all = nla_get_be16(tb[CTA_PROTONAT_PORT_MAX]);
+		range->max_proto.all = nla_get_be16(tb[CTA_PROTONAT_PORT_MAX]);
 		range->flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
 	}
 	return 0;
 }
-EXPORT_SYMBOL_GPL(nf_nat_proto_nlattr_to_range);
+EXPORT_SYMBOL_GPL(nf_nat_l4proto_nlattr_to_range);
 #endif

net/ipv4/netfilter/nf_nat_proto_dccp.c → net/netfilter/nf_nat_proto_dccp.c

 /*
  * DCCP NAT protocol helper
  *
- * Copyright (c) 2005, 2006. 2008 Patrick McHardy <kaber@trash.net>
+ * Copyright (c) 2005, 2006, 2008 Patrick McHardy <kaber@trash.net>
  *
  * 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
@@ -13,35 +13,34 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/skbuff.h>
-#include <linux/ip.h>
 #include <linux/dccp.h>
 
 #include <net/netfilter/nf_conntrack.h>
 #include <net/netfilter/nf_nat.h>
-#include <net/netfilter/nf_nat_protocol.h>
+#include <net/netfilter/nf_nat_l3proto.h>
+#include <net/netfilter/nf_nat_l4proto.h>
 
 static u_int16_t dccp_port_rover;
 
 static void
-dccp_unique_tuple(struct nf_conntrack_tuple *tuple,
-		  const struct nf_nat_ipv4_range *range,
+dccp_unique_tuple(const struct nf_nat_l3proto *l3proto,
+		  struct nf_conntrack_tuple *tuple,
+		  const struct nf_nat_range *range,
 		  enum nf_nat_manip_type maniptype,
 		  const struct nf_conn *ct)
 {
-	nf_nat_proto_unique_tuple(tuple, range, maniptype, ct,
-				  &dccp_port_rover);
+	nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct,
+				    &dccp_port_rover);
 }
 
 static bool
 dccp_manip_pkt(struct sk_buff *skb,
-	       unsigned int iphdroff,
+	       const struct nf_nat_l3proto *l3proto,
+	       unsigned int iphdroff, unsigned int hdroff,
 	       const struct nf_conntrack_tuple *tuple,
 	       enum nf_nat_manip_type maniptype)
 {
-	const struct iphdr *iph = (const void *)(skb->data + iphdroff);
 	struct dccp_hdr *hdr;
-	unsigned int hdroff = iphdroff + iph->ihl * 4;
-	__be32 oldip, newip;
 	__be16 *portptr, oldport, newport;
 	int hdrsize = 8; /* DCCP connection tracking guarantees this much */
 
@@ -51,17 +50,12 @@ dccp_manip_pkt(struct sk_buff *skb,
 	if (!skb_make_writable(skb, hdroff + hdrsize))
 		return false;
 
-	iph = (struct iphdr *)(skb->data + iphdroff);
 	hdr = (struct dccp_hdr *)(skb->data + hdroff);
 
 	if (maniptype == NF_NAT_MANIP_SRC) {
-		oldip = iph->saddr;
-		newip = tuple->src.u3.ip;
 		newport = tuple->src.u.dccp.port;
 		portptr = &hdr->dccph_sport;
 	} else {
-		oldip = iph->daddr;
-		newip = tuple->dst.u3.ip;
 		newport = tuple->dst.u.dccp.port;
 		portptr = &hdr->dccph_dport;
 	}
@@ -72,30 +66,46 @@ dccp_manip_pkt(struct sk_buff *skb,
 	if (hdrsize < sizeof(*hdr))
 		return true;
 
-	inet_proto_csum_replace4(&hdr->dccph_checksum, skb, oldip, newip, 1);
+	l3proto->csum_update(skb, iphdroff, &hdr->dccph_checksum,
+			     tuple, maniptype);
 	inet_proto_csum_replace2(&hdr->dccph_checksum, skb, oldport, newport,
 				 0);
 	return true;
 }
 
-static const struct nf_nat_protocol nf_nat_protocol_dccp = {
-	.protonum		= IPPROTO_DCCP,
+static const struct nf_nat_l4proto nf_nat_l4proto_dccp = {
+	.l4proto		= IPPROTO_DCCP,
 	.manip_pkt		= dccp_manip_pkt,
-	.in_range		= nf_nat_proto_in_range,
+	.in_range		= nf_nat_l4proto_in_range,
 	.unique_tuple		= dccp_unique_tuple,
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
-	.nlattr_to_range	= nf_nat_proto_nlattr_to_range,
+	.nlattr_to_range	= nf_nat_l4proto_nlattr_to_range,
 #endif
 };
 
 static int __init nf_nat_proto_dccp_init(void)
 {
-	return nf_nat_protocol_register(&nf_nat_protocol_dccp);
+	int err;
+
+	err = nf_nat_l4proto_register(NFPROTO_IPV4, &nf_nat_l4proto_dccp);
+	if (err < 0)
+		goto err1;
+	err = nf_nat_l4proto_register(NFPROTO_IPV6, &nf_nat_l4proto_dccp);
+	if (err < 0)
+		goto err2;
+	return 0;
+
+err2:
+	nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_dccp);
+err1:
+	return err;
 }
 
 static void __exit nf_nat_proto_dccp_fini(void)
 {
-	nf_nat_protocol_unregister(&nf_nat_protocol_dccp);
+	nf_nat_l4proto_unregister(NFPROTO_IPV6, &nf_nat_l4proto_dccp);
+	nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_dccp);
+
 }
 
 module_init(nf_nat_proto_dccp_init);

net/ipv4/netfilter/nf_nat_proto_sctp.c → net/netfilter/nf_nat_proto_sctp.c

@@ -8,53 +8,46 @@
 
 #include <linux/types.h>
 #include <linux/init.h>
-#include <linux/ip.h>
 #include <linux/sctp.h>
 #include <linux/module.h>
 #include <net/sctp/checksum.h>
 
-#include <net/netfilter/nf_nat_protocol.h>
+#include <net/netfilter/nf_nat_l4proto.h>
 
 static u_int16_t nf_sctp_port_rover;
 
 static void
-sctp_unique_tuple(struct nf_conntrack_tuple *tuple,
-		  const struct nf_nat_ipv4_range *range,
+sctp_unique_tuple(const struct nf_nat_l3proto *l3proto,
+		  struct nf_conntrack_tuple *tuple,
+		  const struct nf_nat_range *range,
 		  enum nf_nat_manip_type maniptype,
 		  const struct nf_conn *ct)
 {
-	nf_nat_proto_unique_tuple(tuple, range, maniptype, ct,
-				  &nf_sctp_port_rover);
+	nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct,
+				    &nf_sctp_port_rover);
 }
 
 static bool
 sctp_manip_pkt(struct sk_buff *skb,
-	       unsigned int iphdroff,
+	       const struct nf_nat_l3proto *l3proto,
+	       unsigned int iphdroff, unsigned int hdroff,
 	       const struct nf_conntrack_tuple *tuple,
 	       enum nf_nat_manip_type maniptype)
 {
-	const struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
 	struct sk_buff *frag;
 	sctp_sctphdr_t *hdr;
-	unsigned int hdroff = iphdroff + iph->ihl*4;
-	__be32 oldip, newip;
 	__be32 crc32;
 
 	if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
 		return false;
 
-	iph = (struct iphdr *)(skb->data + iphdroff);
 	hdr = (struct sctphdr *)(skb->data + hdroff);
 
 	if (maniptype == NF_NAT_MANIP_SRC) {
-		/* Get rid of src ip and src pt */
-		oldip = iph->saddr;
-		newip = tuple->src.u3.ip;
+		/* Get rid of src port */
 		hdr->source = tuple->src.u.sctp.port;
 	} else {
-		/* Get rid of dst ip and dst pt */
-		oldip = iph->daddr;
-		newip = tuple->dst.u3.ip;
+		/* Get rid of dst port */
 		hdr->dest = tuple->dst.u.sctp.port;
 	}
 
@@ -68,24 +61,38 @@ sctp_manip_pkt(struct sk_buff *skb,
 	return true;
 }
 
-static const struct nf_nat_protocol nf_nat_protocol_sctp = {
-	.protonum		= IPPROTO_SCTP,
+static const struct nf_nat_l4proto nf_nat_l4proto_sctp = {
+	.l4proto		= IPPROTO_SCTP,
 	.manip_pkt		= sctp_manip_pkt,
-	.in_range		= nf_nat_proto_in_range,
+	.in_range		= nf_nat_l4proto_in_range,
 	.unique_tuple		= sctp_unique_tuple,
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
-	.nlattr_to_range	= nf_nat_proto_nlattr_to_range,
+	.nlattr_to_range	= nf_nat_l4proto_nlattr_to_range,
 #endif
 };
 
 static int __init nf_nat_proto_sctp_init(void)
 {
-	return nf_nat_protocol_register(&nf_nat_protocol_sctp);
+	int err;
+
+	err = nf_nat_l4proto_register(NFPROTO_IPV4, &nf_nat_l4proto_sctp);
+	if (err < 0)
+		goto err1;
+	err = nf_nat_l4proto_register(NFPROTO_IPV6, &nf_nat_l4proto_sctp);
+	if (err < 0)
+		goto err2;
+	return 0;
+
+err2:
+	nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_sctp);
+err1:
+	return err;
 }
 
 static void __exit nf_nat_proto_sctp_exit(void)
 {
-	nf_nat_protocol_unregister(&nf_nat_protocol_sctp);
+	nf_nat_l4proto_unregister(NFPROTO_IPV6, &nf_nat_l4proto_sctp);
+	nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_sctp);
 }
 
 module_init(nf_nat_proto_sctp_init);

net/ipv4/netfilter/nf_nat_proto_tcp.c → net/netfilter/nf_nat_proto_tcp.c

@@ -9,37 +9,36 @@
 #include <linux/types.h>
 #include <linux/init.h>
 #include <linux/export.h>
-#include <linux/ip.h>
 #include <linux/tcp.h>
 
 #include <linux/netfilter.h>
 #include <linux/netfilter/nfnetlink_conntrack.h>
 #include <net/netfilter/nf_nat.h>
-#include <net/netfilter/nf_nat_rule.h>
-#include <net/netfilter/nf_nat_protocol.h>
+#include <net/netfilter/nf_nat_l3proto.h>
+#include <net/netfilter/nf_nat_l4proto.h>
 #include <net/netfilter/nf_nat_core.h>
 
-static u_int16_t tcp_port_rover;
+static u16 tcp_port_rover;
 
 static void
-tcp_unique_tuple(struct nf_conntrack_tuple *tuple,
-		 const struct nf_nat_ipv4_range *range,
+tcp_unique_tuple(const struct nf_nat_l3proto *l3proto,
+		 struct nf_conntrack_tuple *tuple,
+		 const struct nf_nat_range *range,
 		 enum nf_nat_manip_type maniptype,
 		 const struct nf_conn *ct)
 {
-	nf_nat_proto_unique_tuple(tuple, range, maniptype, ct, &tcp_port_rover);
+	nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct,
+				    &tcp_port_rover);
 }
 
 static bool
 tcp_manip_pkt(struct sk_buff *skb,
-	      unsigned int iphdroff,
+	      const struct nf_nat_l3proto *l3proto,
+	      unsigned int iphdroff, unsigned int hdroff,
 	      const struct nf_conntrack_tuple *tuple,
 	      enum nf_nat_manip_type maniptype)
 {
-	const struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
 	struct tcphdr *hdr;
-	unsigned int hdroff = iphdroff + iph->ihl*4;
-	__be32 oldip, newip;
 	__be16 *portptr, newport, oldport;
 	int hdrsize = 8; /* TCP connection tracking guarantees this much */
 
@@ -52,19 +51,14 @@ tcp_manip_pkt(struct sk_buff *skb,
 	if (!skb_make_writable(skb, hdroff + hdrsize))
 		return false;
 
-	iph = (struct iphdr *)(skb->data + iphdroff);
 	hdr = (struct tcphdr *)(skb->data + hdroff);
 
 	if (maniptype == NF_NAT_MANIP_SRC) {
-		/* Get rid of src ip and src pt */
-		oldip = iph->saddr;
-		newip = tuple->src.u3.ip;
+		/* Get rid of src port */
 		newport = tuple->src.u.tcp.port;
 		portptr = &hdr->source;
 	} else {
-		/* Get rid of dst ip and dst pt */
-		oldip = iph->daddr;
-		newip = tuple->dst.u3.ip;
+		/* Get rid of dst port */
 		newport = tuple->dst.u.tcp.port;
 		portptr = &hdr->dest;
 	}
@@ -75,17 +69,17 @@ tcp_manip_pkt(struct sk_buff *skb,
 	if (hdrsize < sizeof(*hdr))
 		return true;
 
-	inet_proto_csum_replace4(&hdr->check, skb, oldip, newip, 1);
+	l3proto->csum_update(skb, iphdroff, &hdr->check, tuple, maniptype);
 	inet_proto_csum_replace2(&hdr->check, skb, oldport, newport, 0);
 	return true;
 }
 
-const struct nf_nat_protocol nf_nat_protocol_tcp = {
-	.protonum		= IPPROTO_TCP,
+const struct nf_nat_l4proto nf_nat_l4proto_tcp = {
+	.l4proto		= IPPROTO_TCP,
 	.manip_pkt		= tcp_manip_pkt,
-	.in_range		= nf_nat_proto_in_range,
+	.in_range		= nf_nat_l4proto_in_range,
 	.unique_tuple		= tcp_unique_tuple,
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
-	.nlattr_to_range	= nf_nat_proto_nlattr_to_range,
+	.nlattr_to_range	= nf_nat_l4proto_nlattr_to_range,
 #endif
 };

net/ipv4/netfilter/nf_nat_proto_udp.c → net/netfilter/nf_nat_proto_udp.c

@@ -9,59 +9,53 @@
 #include <linux/types.h>
 #include <linux/export.h>
 #include <linux/init.h>
-#include <linux/ip.h>
 #include <linux/udp.h>
 
 #include <linux/netfilter.h>
 #include <net/netfilter/nf_nat.h>
 #include <net/netfilter/nf_nat_core.h>
-#include <net/netfilter/nf_nat_rule.h>
-#include <net/netfilter/nf_nat_protocol.h>
+#include <net/netfilter/nf_nat_l3proto.h>
+#include <net/netfilter/nf_nat_l4proto.h>
 
-static u_int16_t udp_port_rover;
+static u16 udp_port_rover;
 
 static void
-udp_unique_tuple(struct nf_conntrack_tuple *tuple,
-		 const struct nf_nat_ipv4_range *range,
+udp_unique_tuple(const struct nf_nat_l3proto *l3proto,
+		 struct nf_conntrack_tuple *tuple,
+		 const struct nf_nat_range *range,
 		 enum nf_nat_manip_type maniptype,
 		 const struct nf_conn *ct)
 {
-	nf_nat_proto_unique_tuple(tuple, range, maniptype, ct, &udp_port_rover);
+	nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct,
+				    &udp_port_rover);
 }
 
 static bool
 udp_manip_pkt(struct sk_buff *skb,
-	      unsigned int iphdroff,
+	      const struct nf_nat_l3proto *l3proto,
+	      unsigned int iphdroff, unsigned int hdroff,
 	      const struct nf_conntrack_tuple *tuple,
 	      enum nf_nat_manip_type maniptype)
 {
-	const struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
 	struct udphdr *hdr;
-	unsigned int hdroff = iphdroff + iph->ihl*4;
-	__be32 oldip, newip;
 	__be16 *portptr, newport;
 
 	if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
 		return false;
-
-	iph = (struct iphdr *)(skb->data + iphdroff);
 	hdr = (struct udphdr *)(skb->data + hdroff);
 
 	if (maniptype == NF_NAT_MANIP_SRC) {
-		/* Get rid of src ip and src pt */
-		oldip = iph->saddr;
-		newip = tuple->src.u3.ip;
+		/* Get rid of src port */
 		newport = tuple->src.u.udp.port;
 		portptr = &hdr->source;
 	} else {
-		/* Get rid of dst ip and dst pt */
-		oldip = iph->daddr;
-		newip = tuple->dst.u3.ip;
+		/* Get rid of dst port */
 		newport = tuple->dst.u.udp.port;
 		portptr = &hdr->dest;
 	}
 	if (hdr->check || skb->ip_summed == CHECKSUM_PARTIAL) {
-		inet_proto_csum_replace4(&hdr->check, skb, oldip, newip, 1);
+		l3proto->csum_update(skb, iphdroff, &hdr->check,
+				     tuple, maniptype);
 		inet_proto_csum_replace2(&hdr->check, skb, *portptr, newport,
 					 0);
 		if (!hdr->check)
@@ -71,12 +65,12 @@ udp_manip_pkt(struct sk_buff *skb,
 	return true;
 }
 
-const struct nf_nat_protocol nf_nat_protocol_udp = {
-	.protonum		= IPPROTO_UDP,
+const struct nf_nat_l4proto nf_nat_l4proto_udp = {
+	.l4proto		= IPPROTO_UDP,
 	.manip_pkt		= udp_manip_pkt,
-	.in_range		= nf_nat_proto_in_range,
+	.in_range		= nf_nat_l4proto_in_range,
 	.unique_tuple		= udp_unique_tuple,
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
-	.nlattr_to_range	= nf_nat_proto_nlattr_to_range,
+	.nlattr_to_range	= nf_nat_l4proto_nlattr_to_range,
 #endif
 };

net/ipv4/netfilter/nf_nat_proto_udplite.c → net/netfilter/nf_nat_proto_udplite.c

@@ -9,59 +9,53 @@
 
 #include <linux/types.h>
 #include <linux/init.h>
-#include <linux/ip.h>
 #include <linux/udp.h>
 
 #include <linux/netfilter.h>
 #include <linux/module.h>
 #include <net/netfilter/nf_nat.h>
-#include <net/netfilter/nf_nat_protocol.h>
+#include <net/netfilter/nf_nat_l3proto.h>
+#include <net/netfilter/nf_nat_l4proto.h>
 
-static u_int16_t udplite_port_rover;
+static u16 udplite_port_rover;
 
 static void
-udplite_unique_tuple(struct nf_conntrack_tuple *tuple,
-		     const struct nf_nat_ipv4_range *range,
+udplite_unique_tuple(const struct nf_nat_l3proto *l3proto,
+		     struct nf_conntrack_tuple *tuple,
+		     const struct nf_nat_range *range,
 		     enum nf_nat_manip_type maniptype,
 		     const struct nf_conn *ct)
 {
-	nf_nat_proto_unique_tuple(tuple, range, maniptype, ct,
-				  &udplite_port_rover);
+	nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct,
+				    &udplite_port_rover);
 }
 
 static bool
 udplite_manip_pkt(struct sk_buff *skb,
-		  unsigned int iphdroff,
+		  const struct nf_nat_l3proto *l3proto,
+		  unsigned int iphdroff, unsigned int hdroff,
 		  const struct nf_conntrack_tuple *tuple,
 		  enum nf_nat_manip_type maniptype)
 {
-	const struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
 	struct udphdr *hdr;
-	unsigned int hdroff = iphdroff + iph->ihl*4;
-	__be32 oldip, newip;
 	__be16 *portptr, newport;
 
 	if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
 		return false;
 
-	iph = (struct iphdr *)(skb->data + iphdroff);
 	hdr = (struct udphdr *)(skb->data + hdroff);
 
 	if (maniptype == NF_NAT_MANIP_SRC) {
-		/* Get rid of src ip and src pt */
-		oldip = iph->saddr;
-		newip = tuple->src.u3.ip;
+		/* Get rid of source port */
 		newport = tuple->src.u.udp.port;
 		portptr = &hdr->source;
 	} else {
-		/* Get rid of dst ip and dst pt */
-		oldip = iph->daddr;
-		newip = tuple->dst.u3.ip;
+		/* Get rid of dst port */
 		newport = tuple->dst.u.udp.port;
 		portptr = &hdr->dest;
 	}
 
-	inet_proto_csum_replace4(&hdr->check, skb, oldip, newip, 1);
+	l3proto->csum_update(skb, iphdroff, &hdr->check, tuple, maniptype);
 	inet_proto_csum_replace2(&hdr->check, skb, *portptr, newport, 0);
 	if (!hdr->check)
 		hdr->check = CSUM_MANGLED_0;
@@ -70,24 +64,38 @@ udplite_manip_pkt(struct sk_buff *skb,
 	return true;
 }
 
-static const struct nf_nat_protocol nf_nat_protocol_udplite = {
-	.protonum		= IPPROTO_UDPLITE,
+static const struct nf_nat_l4proto nf_nat_l4proto_udplite = {
+	.l4proto		= IPPROTO_UDPLITE,
 	.manip_pkt		= udplite_manip_pkt,
-	.in_range		= nf_nat_proto_in_range,
+	.in_range		= nf_nat_l4proto_in_range,
 	.unique_tuple		= udplite_unique_tuple,
 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
-	.nlattr_to_range	= nf_nat_proto_nlattr_to_range,
+	.nlattr_to_range	= nf_nat_l4proto_nlattr_to_range,
 #endif
 };
 
 static int __init nf_nat_proto_udplite_init(void)
 {
-	return nf_nat_protocol_register(&nf_nat_protocol_udplite);
+	int err;
+
+	err = nf_nat_l4proto_register(NFPROTO_IPV4, &nf_nat_l4proto_udplite);
+	if (err < 0)
+		goto err1;
+	err = nf_nat_l4proto_register(NFPROTO_IPV6, &nf_nat_l4proto_udplite);
+	if (err < 0)
+		goto err2;
+	return 0;
+
+err2:
+	nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_udplite);
+err1:
+	return err;
 }
 
 static void __exit nf_nat_proto_udplite_fini(void)
 {
-	nf_nat_protocol_unregister(&nf_nat_protocol_udplite);
+	nf_nat_l4proto_unregister(NFPROTO_IPV6, &nf_nat_l4proto_udplite);
+	nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_udplite);
 }
 
 module_init(nf_nat_proto_udplite_init);

net/ipv4/netfilter/nf_nat_proto_unknown.c → net/netfilter/nf_nat_proto_unknown.c

@@ -15,8 +15,7 @@
 
 #include <linux/netfilter.h>
 #include <net/netfilter/nf_nat.h>
-#include <net/netfilter/nf_nat_rule.h>
-#include <net/netfilter/nf_nat_protocol.h>
+#include <net/netfilter/nf_nat_l4proto.h>
 
 static bool unknown_in_range(const struct nf_conntrack_tuple *tuple,
 			     enum nf_nat_manip_type manip_type,
@@ -26,26 +25,29 @@ static bool unknown_in_range(const struct nf_conntrack_tuple *tuple,
 	return true;
 }
 
-static void unknown_unique_tuple(struct nf_conntrack_tuple *tuple,
-				 const struct nf_nat_ipv4_range *range,
+static void unknown_unique_tuple(const struct nf_nat_l3proto *l3proto,
+				 struct nf_conntrack_tuple *tuple,
+				 const struct nf_nat_range *range,
 				 enum nf_nat_manip_type maniptype,
 				 const struct nf_conn *ct)
 {
 	/* Sorry: we can't help you; if it's not unique, we can't frob
-	   anything. */
+	 * anything.
+	 */
 	return;
 }
 
 static bool
 unknown_manip_pkt(struct sk_buff *skb,
-		  unsigned int iphdroff,
+		  const struct nf_nat_l3proto *l3proto,
+		  unsigned int iphdroff, unsigned int hdroff,
 		  const struct nf_conntrack_tuple *tuple,
 		  enum nf_nat_manip_type maniptype)
 {
 	return true;
 }
 
-const struct nf_nat_protocol nf_nat_unknown_protocol = {
+const struct nf_nat_l4proto nf_nat_l4proto_unknown = {
 	.manip_pkt		= unknown_manip_pkt,
 	.in_range		= unknown_in_range,
 	.unique_tuple		= unknown_unique_tuple,

net/netfilter/xt_nat.c

+/*
+ * (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
+ * (C) 2011 Patrick McHardy <kaber@trash.net>
+ *
+ * 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>
+#include <linux/skbuff.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/x_tables.h>
+#include <net/netfilter/nf_nat_core.h>
+
+static int xt_nat_checkentry_v0(const struct xt_tgchk_param *par)
+{
+	const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
+
+	if (mr->rangesize != 1) {
+		pr_info("%s: multiple ranges no longer supported\n",
+			par->target->name);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static void xt_nat_convert_range(struct nf_nat_range *dst,
+				 const struct nf_nat_ipv4_range *src)
+{
+	memset(&dst->min_addr, 0, sizeof(dst->min_addr));
+	memset(&dst->max_addr, 0, sizeof(dst->max_addr));
+
+	dst->flags	 = src->flags;
+	dst->min_addr.ip = src->min_ip;
+	dst->max_addr.ip = src->max_ip;
+	dst->min_proto	 = src->min;
+	dst->max_proto	 = src->max;
+}
+
+static unsigned int
+xt_snat_target_v0(struct sk_buff *skb, const struct xt_action_param *par)
+{
+	const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
+	struct nf_nat_range range;
+	enum ip_conntrack_info ctinfo;
+	struct nf_conn *ct;
+
+	ct = nf_ct_get(skb, &ctinfo);
+	NF_CT_ASSERT(ct != NULL &&
+		     (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED ||
+		      ctinfo == IP_CT_RELATED_REPLY));
+
+	xt_nat_convert_range(&range, &mr->range[0]);
+	return nf_nat_setup_info(ct, &range, NF_NAT_MANIP_SRC);
+}
+
+static unsigned int
+xt_dnat_target_v0(struct sk_buff *skb, const struct xt_action_param *par)
+{
+	const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
+	struct nf_nat_range range;
+	enum ip_conntrack_info ctinfo;
+	struct nf_conn *ct;
+
+	ct = nf_ct_get(skb, &ctinfo);
+	NF_CT_ASSERT(ct != NULL &&
+		     (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED));
+
+	xt_nat_convert_range(&range, &mr->range[0]);
+	return nf_nat_setup_info(ct, &range, NF_NAT_MANIP_DST);
+}
+
+static unsigned int
+xt_snat_target_v1(struct sk_buff *skb, const struct xt_action_param *par)
+{
+	const struct nf_nat_range *range = par->targinfo;
+	enum ip_conntrack_info ctinfo;
+	struct nf_conn *ct;
+
+	ct = nf_ct_get(skb, &ctinfo);
+	NF_CT_ASSERT(ct != NULL &&
+		     (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED ||
+		      ctinfo == IP_CT_RELATED_REPLY));
+
+	return nf_nat_setup_info(ct, range, NF_NAT_MANIP_SRC);
+}
+
+static unsigned int
+xt_dnat_target_v1(struct sk_buff *skb, const struct xt_action_param *par)
+{
+	const struct nf_nat_range *range = par->targinfo;
+	enum ip_conntrack_info ctinfo;
+	struct nf_conn *ct;
+
+	ct = nf_ct_get(skb, &ctinfo);
+	NF_CT_ASSERT(ct != NULL &&
+		     (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED));
+
+	return nf_nat_setup_info(ct, range, NF_NAT_MANIP_DST);
+}
+
+static struct xt_target xt_nat_target_reg[] __read_mostly = {
+	{
+		.name		= "SNAT",
+		.revision	= 0,
+		.checkentry	= xt_nat_checkentry_v0,
+		.target		= xt_snat_target_v0,
+		.targetsize	= sizeof(struct nf_nat_ipv4_multi_range_compat),
+		.family		= NFPROTO_IPV4,
+		.table		= "nat",
+		.hooks		= (1 << NF_INET_POST_ROUTING) |
+				  (1 << NF_INET_LOCAL_OUT),
+		.me		= THIS_MODULE,
+	},
+	{
+		.name		= "DNAT",
+		.revision	= 0,
+		.checkentry	= xt_nat_checkentry_v0,
+		.target		= xt_dnat_target_v0,
+		.targetsize	= sizeof(struct nf_nat_ipv4_multi_range_compat),
+		.family		= NFPROTO_IPV4,
+		.table		= "nat",
+		.hooks		= (1 << NF_INET_PRE_ROUTING) |
+				  (1 << NF_INET_LOCAL_IN),
+		.me		= THIS_MODULE,
+	},
+	{
+		.name		= "SNAT",
+		.revision	= 1,
+		.target		= xt_snat_target_v1,
+		.targetsize	= sizeof(struct nf_nat_range),
+		.table		= "nat",
+		.hooks		= (1 << NF_INET_POST_ROUTING) |
+				  (1 << NF_INET_LOCAL_OUT),
+		.me		= THIS_MODULE,
+	},
+	{
+		.name		= "DNAT",
+		.revision	= 1,
+		.target		= xt_dnat_target_v1,
+		.targetsize	= sizeof(struct nf_nat_range),
+		.table		= "nat",
+		.hooks		= (1 << NF_INET_PRE_ROUTING) |
+				  (1 << NF_INET_LOCAL_IN),
+		.me		= THIS_MODULE,
+	},
+};
+
+static int __init xt_nat_init(void)
+{
+	return xt_register_targets(xt_nat_target_reg,
+				   ARRAY_SIZE(xt_nat_target_reg));
+}
+
+static void __exit xt_nat_exit(void)
+{
+	xt_unregister_targets(xt_nat_target_reg, ARRAY_SIZE(xt_nat_target_reg));
+}
+
+module_init(xt_nat_init);
+module_exit(xt_nat_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_SNAT");
+MODULE_ALIAS("ipt_DNAT");