--- zzzz-none-000/linux-2.4.17/include/linux/netfilter_ipv4/ip_nat_helper.h	2001-04-25 22:00:28.000000000 +0000
+++ sangam-fb-322/linux-2.4.17/include/linux/netfilter_ipv4/ip_nat_helper.h	2004-11-24 13:21:45.000000000 +0000
@@ -6,23 +6,37 @@
 
 struct sk_buff;
 
+/* Flags */
+/* NAT helper must be called on every packet (for TCP) */
+#define IP_NAT_HELPER_F_ALWAYS		0x01
+/* Standalone NAT helper, without a conntrack part */
+#define IP_NAT_HELPER_F_STANDALONE	0x02
+
 struct ip_nat_helper
 {
-	/* Internal use */
-	struct list_head list;
+	struct list_head list;		/* Internal use */
 
+	const char *name;		/* name of the module */
+	unsigned char flags;		/* Flags (see above) */
+	struct module *me;		/* pointer to self */
+	
 	/* Mask of things we will help: vs. tuple from server */
 	struct ip_conntrack_tuple tuple;
 	struct ip_conntrack_tuple mask;
 	
 	/* Helper function: returns verdict */
 	unsigned int (*help)(struct ip_conntrack *ct,
+			     struct ip_conntrack_expect *exp,
 			     struct ip_nat_info *info,
 			     enum ip_conntrack_info ctinfo,
 			     unsigned int hooknum,
 			     struct sk_buff **pskb);
 
-	const char *name;
+	/* Returns verdict and sets up NAT for this connection */
+	unsigned int (*expect)(struct sk_buff **pskb,
+			       unsigned int hooknum,
+			       struct ip_conntrack *ct,
+			       struct ip_nat_info *info);
 };
 
 extern struct list_head helpers;
@@ -39,5 +53,5 @@
 extern int ip_nat_seq_adjust(struct sk_buff *skb,
 				struct ip_conntrack *ct,
 				enum ip_conntrack_info ctinfo);
-extern void ip_nat_delete_sack(struct sk_buff *skb, struct tcphdr *tcph);
+extern void ip_nat_delete_sack(struct sk_buff *skb);
 #endif