[NETFILTER] first conntrack ID must be 1 not 2

The first conntrack ID must be 1. If a new conntrack is created, the
general ID counter must be post-incremented instead pre-incremented since
[ip|nf]_conntrack_next_id is initialized to 1. Same applies for expectations.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

Index: net-2.6.git/net/netfilter/nf_conntrack_core.c
===================================================================
--- net-2.6.git.orig/net/netfilter/nf_conntrack_core.c	2006-02-13 01:05:04.000000000 +0100
+++ net-2.6.git/net/netfilter/nf_conntrack_core.c	2006-02-13 01:47:04.000000000 +0100
@@ -682,7 +682,7 @@ static void __nf_conntrack_hash_insert(s
 				       unsigned int hash,
 				       unsigned int repl_hash) 
 {
-	ct->id = ++nf_conntrack_next_id;
+	ct->id = nf_conntrack_next_id++;
 	list_prepend(&nf_conntrack_hash[hash],
 		     &ct->tuplehash[IP_CT_DIR_ORIGINAL].list);
 	list_prepend(&nf_conntrack_hash[repl_hash],
@@ -1247,7 +1247,7 @@ static void nf_conntrack_expect_insert(s
 	exp->timeout.expires = jiffies + exp->master->helper->timeout * HZ;
 	add_timer(&exp->timeout);
 
-	exp->id = ++nf_conntrack_expect_next_id;
+	exp->id = nf_conntrack_expect_next_id++;
 	atomic_inc(&exp->use);
 	NF_CT_STAT_INC(expect_create);
 }
Index: net-2.6.git/net/ipv4/netfilter/ip_conntrack_core.c
===================================================================
--- net-2.6.git.orig/net/ipv4/netfilter/ip_conntrack_core.c	2006-02-04 14:34:40.000000000 +0100
+++ net-2.6.git/net/ipv4/netfilter/ip_conntrack_core.c	2006-02-13 01:46:42.000000000 +0100
@@ -417,7 +417,7 @@ static void __ip_conntrack_hash_insert(s
 					unsigned int hash,
 					unsigned int repl_hash) 
 {
-	ct->id = ++ip_conntrack_next_id;
+	ct->id = ip_conntrack_next_id++;
 	list_prepend(&ip_conntrack_hash[hash],
 		     &ct->tuplehash[IP_CT_DIR_ORIGINAL].list);
 	list_prepend(&ip_conntrack_hash[repl_hash],
@@ -971,7 +971,7 @@ static void ip_conntrack_expect_insert(s
 	exp->timeout.expires = jiffies + exp->master->helper->timeout * HZ;
 	add_timer(&exp->timeout);
 
-	exp->id = ++ip_conntrack_expect_next_id;
+	exp->id = ip_conntrack_expect_next_id++;
 	atomic_inc(&exp->use);
 	CONNTRACK_STAT_INC(expect_create);
 }