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>

7 files changed, 8 insertions, 49 deletions

diff --git a/include/net/netfilter/nf_conntrack_ecache.h b/include/net/netfilter/nf_conntrack_ecache.h
index 892b8cdf7f6..2e17a2d0eb3 100644
--- a/include/net/netfilter/nf_conntrack_ecache.h
+++ b/include/net/netfilter/nf_conntrack_ecache.h
@@ -26,52 +26,28 @@ enum ip_conntrack_events
         IPCT_DESTROY_BIT = 2,
         IPCT_DESTROY = (1 << IPCT_DESTROY_BIT),
 
-        /* Timer has been refreshed */
-        IPCT_REFRESH_BIT = 3,
-        IPCT_REFRESH = (1 << IPCT_REFRESH_BIT),
-
         /* Status has changed */
-        IPCT_STATUS_BIT = 4,
+        IPCT_STATUS_BIT = 3,
         IPCT_STATUS = (1 << IPCT_STATUS_BIT),
 
         /* Update of protocol info */
-        IPCT_PROTOINFO_BIT = 5,
+        IPCT_PROTOINFO_BIT = 4,
         IPCT_PROTOINFO = (1 << IPCT_PROTOINFO_BIT),
 
-        /* Volatile protocol info */
-        IPCT_PROTOINFO_VOLATILE_BIT = 6,
-        IPCT_PROTOINFO_VOLATILE = (1 << IPCT_PROTOINFO_VOLATILE_BIT),
-
         /* New helper for conntrack */
-        IPCT_HELPER_BIT = 7,
+        IPCT_HELPER_BIT = 5,
         IPCT_HELPER = (1 << IPCT_HELPER_BIT),
 
-        /* Update of helper info */
-        IPCT_HELPINFO_BIT = 8,
-        IPCT_HELPINFO = (1 << IPCT_HELPINFO_BIT),
-
-        /* Volatile helper info */
-        IPCT_HELPINFO_VOLATILE_BIT = 9,
-        IPCT_HELPINFO_VOLATILE = (1 << IPCT_HELPINFO_VOLATILE_BIT),
-
-        /* NAT info */
-        IPCT_NATINFO_BIT = 10,
-        IPCT_NATINFO = (1 << IPCT_NATINFO_BIT),
-
-        /* Counter highest bit has been set, unused */
-        IPCT_COUNTER_FILLING_BIT = 11,
-        IPCT_COUNTER_FILLING = (1 << IPCT_COUNTER_FILLING_BIT),
-
         /* Mark is set */
-        IPCT_MARK_BIT = 12,
+        IPCT_MARK_BIT = 6,
         IPCT_MARK = (1 << IPCT_MARK_BIT),
 
         /* NAT sequence adjustment */
-        IPCT_NATSEQADJ_BIT = 13,
+        IPCT_NATSEQADJ_BIT = 7,
         IPCT_NATSEQADJ = (1 << IPCT_NATSEQADJ_BIT),
 
         /* Secmark is set */
-        IPCT_SECMARK_BIT = 14,
+        IPCT_SECMARK_BIT = 8,
         IPCT_SECMARK = (1 << IPCT_SECMARK_BIT),
 };
 
diff --git a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
index 23b2c2ee869..c6ab3d99e79 100644
--- a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
+++ b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
@@ -91,7 +91,6 @@ static int icmp_packet(struct nf_conn *ct,
                         nf_ct_kill_acct(ct, ctinfo, skb);
         } else {
                 atomic_inc(&ct->proto.icmp.count);
-                nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, ct);
                 nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_icmp_timeout);
         }
 
diff --git a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
index 9903227bf37..a0acd9655fe 100644
--- a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
+++ b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
@@ -104,7 +104,6 @@ static int icmpv6_packet(struct nf_conn *ct,
                         nf_ct_kill_acct(ct, ctinfo, skb);
         } else {
                 atomic_inc(&ct->proto.icmp.count);
-                nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, ct);
                 nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_icmpv6_timeout);
         }
 
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index f59c4edf905..b54c23475e9 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 00fecc385f9..5509dd1f14c 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 3a20de1be63..b1b9e4fb7de 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 4c7f6f0dae9..b7e8a825efe 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);