netfilter: conntrack: simplify event caching system

This patch simplifies the conntrack event caching system by removing
several events:

 * IPCT_[*]_VOLATILE, IPCT_HELPINFO and IPCT_NATINFO has been deleted
   since the have no clients.
 * IPCT_COUNTER_FILLING which is a leftover of the 32-bits counter
   days.
 * IPCT_REFRESH which is not of any use since we always include the
   timeout in the messages.

After this patch, the existing events are:

 * IPCT_NEW, IPCT_RELATED and IPCT_DESTROY, that are used to identify
 addition and deletion of entries.
 * IPCT_STATUS, that notes that the status bits have changes,
 eg. IPS_SEEN_REPLY and IPS_ASSURED.
 * IPCT_PROTOINFO, that reports that internal protocol information has
 changed, eg. the TCP, DCCP and SCTP protocol state.
 * IPCT_HELPER, that a helper has been assigned or unassigned to this
 entry.
 * IPCT_MARK and IPCT_SECMARK, that reports that the mark has changed, this
 covers the case when a mark is set to zero.
 * IPCT_NATSEQADJ, to report that there's updates in the NAT sequence
 adjustment.

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

4 files changed, 2 insertions, 17 deletions

diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index f59c4edf905a..b54c23475e94 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -398,11 +398,7 @@ __nf_conntrack_confirm(struct sk_buff *skb)
 	help = nfct_help(ct);
 	if (help && help->helper)
 		nf_conntrack_event_cache(IPCT_HELPER, ct);
-#ifdef CONFIG_NF_NAT_NEEDED
-	if (test_bit(IPS_SRC_NAT_DONE_BIT, &ct->status) ||
-	    test_bit(IPS_DST_NAT_DONE_BIT, &ct->status))
-		nf_conntrack_event_cache(IPCT_NATINFO, ct);
-#endif
+
 	nf_conntrack_event_cache(master_ct(ct) ?
 				 IPCT_RELATED : IPCT_NEW, ct);
 	return NF_ACCEPT;
@@ -807,8 +803,6 @@ void __nf_ct_refresh_acct(struct nf_conn *ct,
 			  unsigned long extra_jiffies,
 			  int do_acct)
 {
-	int event = 0;
-
 	NF_CT_ASSERT(ct->timeout.data == (unsigned long)ct);
 	NF_CT_ASSERT(skb);
 
@@ -821,7 +815,6 @@ void __nf_ct_refresh_acct(struct nf_conn *ct,
 	/* If not in hash table, timer will not be active yet */
 	if (!nf_ct_is_confirmed(ct)) {
 		ct->timeout.expires = extra_jiffies;
-		event = IPCT_REFRESH;
 	} else {
 		unsigned long newtime = jiffies + extra_jiffies;
 
@@ -832,7 +825,6 @@ void __nf_ct_refresh_acct(struct nf_conn *ct,
 		    && del_timer(&ct->timeout)) {
 			ct->timeout.expires = newtime;
 			add_timer(&ct->timeout);
-			event = IPCT_REFRESH;
 		}
 	}
 
@@ -849,10 +841,6 @@ acct:
 	}
 
 	spin_unlock_bh(&nf_conntrack_lock);
-
-	/* must be unlocked when calling event cache */
-	if (event)
-		nf_conntrack_event_cache(event, ct);
 }
 EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct);
 
diff --git a/net/netfilter/nf_conntrack_ftp.c b/net/netfilter/nf_conntrack_ftp.c
index 00fecc385f9b..5509dd1f14cf 100644
--- a/net/netfilter/nf_conntrack_ftp.c
+++ b/net/netfilter/nf_conntrack_ftp.c
@@ -338,11 +338,9 @@ static void update_nl_seq(struct nf_conn *ct, u32 nl_seq,
 
 	if (info->seq_aft_nl_num[dir] < NUM_SEQ_TO_REMEMBER) {
 		info->seq_aft_nl[dir][info->seq_aft_nl_num[dir]++] = nl_seq;
-		nf_conntrack_event_cache(IPCT_HELPINFO_VOLATILE, ct);
 	} else if (oldest != NUM_SEQ_TO_REMEMBER &&
 		   after(nl_seq, info->seq_aft_nl[dir][oldest])) {
 		info->seq_aft_nl[dir][oldest] = nl_seq;
-		nf_conntrack_event_cache(IPCT_HELPINFO_VOLATILE, ct);
 	}
 }
 
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 3a20de1be63c..b1b9e4fb7ded 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -477,7 +477,7 @@ static int ctnetlink_conntrack_event(struct notifier_block *this,
 		type = IPCTNL_MSG_CT_NEW;
 		flags = NLM_F_CREATE|NLM_F_EXCL;
 		group = NFNLGRP_CONNTRACK_NEW;
-	} else  if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
+	} else  if (events) {
 		type = IPCTNL_MSG_CT_NEW;
 		group = NFNLGRP_CONNTRACK_UPDATE;
 	} else
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index 4c7f6f0dae90..b7e8a825efed 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -991,7 +991,6 @@ static int tcp_packet(struct nf_conn *ct,
 		timeout = tcp_timeouts[new_state];
 	write_unlock_bh(&tcp_lock);
 
-	nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, ct);
 	if (new_state != old_state)
 		nf_conntrack_event_cache(IPCT_PROTOINFO, ct);