[NETFILTER]: nf_conntrack: kill unique ID

Remove the per-conntrack ID, its not necessary anymore for dumping.
For compatiblity reasons we send the address of the conntrack to
userspace as ID.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/netfilter/nf_conntrack.h

@@ -116,9 +116,6 @@ struct nf_conn
 	struct ip_conntrack_counter counters[IP_CT_DIR_MAX];
 #endif
 
-	/* Unique ID that identifies this conntrack*/
-	unsigned int id;
-
 #if defined(CONFIG_NF_CONNTRACK_MARK)
 	u_int32_t mark;
 #endif

net/netfilter/nf_conntrack_core.c

@@ -63,7 +63,6 @@ unsigned int nf_ct_log_invalid __read_mostly;
 HLIST_HEAD(unconfirmed);
 static int nf_conntrack_vmalloc __read_mostly;
 static struct kmem_cache *nf_conntrack_cachep __read_mostly;
-static unsigned int nf_conntrack_next_id;
 
 DEFINE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat);
 EXPORT_PER_CPU_SYMBOL(nf_conntrack_stat);
@@ -287,7 +286,6 @@ static void __nf_conntrack_hash_insert(struct nf_conn *ct,
 				       unsigned int hash,
 				       unsigned int repl_hash)
 {
-	ct->id = ++nf_conntrack_next_id;
 	hlist_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode,
 		       &nf_conntrack_hash[hash]);
 	hlist_add_head(&ct->tuplehash[IP_CT_DIR_REPLY].hnode,

net/netfilter/nf_conntrack_netlink.c

@@ -257,7 +257,7 @@ nla_put_failure:
 static inline int
 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 {
-	__be32 id = htonl(ct->id);
+	__be32 id = htonl((unsigned long)ct);
 	NLA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id);
 	return 0;
 
@@ -723,7 +723,7 @@ ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 
 	if (cda[CTA_ID]) {
 		u_int32_t id = ntohl(*(__be32 *)nla_data(cda[CTA_ID]));
-		if (ct->id != id) {
+		if (id != (u32)(unsigned long)ct) {
 			nf_ct_put(ct);
 			return -ENOENT;
 		}