[IPVS]: Create synced connections with their real state

With this patch the synced connections are created with their real state,
which can be changed on the next synchronizations if necessary. This way
on fail-over all the connections will be treated according to their actual
state, causing no scheduling problems (the active and the nonactive
connections have different weights in the schedulers).
The backwards compatibility is preserved and the existing tools will show
the true connection states even on the backup director.
Signed-off-by: Rumen G. Bogdanovski <rumen@voicecho.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/ipvs/ip_vs_conn.c

@@ -393,6 +393,14 @@ ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest)
 	atomic_inc(&dest->refcnt);
 
 	/* Bind with the destination and its corresponding transmitter */
+	if ((cp->flags & IP_VS_CONN_F_SYNC) &&
+	    (!(cp->flags & IP_VS_CONN_F_TEMPLATE)))
+		/* if the connection is not template and is created
+		 * by sync, preserve the activity flag.
+		 */
+		cp->flags |= atomic_read(&dest->conn_flags) &
+			     (~IP_VS_CONN_F_INACTIVE);
+	else
 		cp->flags |= atomic_read(&dest->conn_flags);
 	cp->dest = dest;
 
@@ -412,6 +420,10 @@ ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest)
 		/* It is a normal connection, so increase the inactive
 		   connection counter because it is in TCP SYNRECV
 		   state (inactive) or other protocol inacive state */
+		if ((cp->flags & IP_VS_CONN_F_SYNC) &&
+		    (!(cp->flags & IP_VS_CONN_F_INACTIVE)))
+			atomic_inc(&dest->activeconns);
+		else
 			atomic_inc(&dest->inactconns);
 	} else {
 		/* It is a persistent connection/template, so increase

net/ipv4/ipvs/ip_vs_sync.c

@@ -305,10 +305,11 @@ static void ip_vs_process_message(const char *buffer, const size_t buflen)
 
 	p = (char *)buffer + sizeof(struct ip_vs_sync_mesg);
 	for (i=0; i<m->nr_conns; i++) {
-		unsigned flags;
+		unsigned flags, state;
 
 		s = (struct ip_vs_sync_conn *)p;
 		flags = ntohs(s->flags) | IP_VS_CONN_F_SYNC;
+		state = ntohs(s->state);
 		if (!(flags & IP_VS_CONN_F_TEMPLATE))
 			cp = ip_vs_conn_in_get(s->protocol,
 					       s->caddr, s->cport,
@@ -326,6 +327,13 @@ static void ip_vs_process_message(const char *buffer, const size_t buflen)
 			dest = ip_vs_find_dest(s->daddr, s->dport,
 					       s->vaddr, s->vport,
 					       s->protocol);
+			/*  Set the approprite ativity flag */
+			if (s->protocol == IPPROTO_TCP) {
+				if (state != IP_VS_TCP_S_ESTABLISHED)
+					flags |= IP_VS_CONN_F_INACTIVE;
+				else
+					flags &= ~IP_VS_CONN_F_INACTIVE;
+			}
 			cp = ip_vs_conn_new(s->protocol,
 					    s->caddr, s->cport,
 					    s->vaddr, s->vport,
@@ -337,7 +345,7 @@ static void ip_vs_process_message(const char *buffer, const size_t buflen)
 				IP_VS_ERR("ip_vs_conn_new failed\n");
 				return;
 			}
-			cp->state = ntohs(s->state);
+			cp->state = state;
 		} else if (!cp->dest) {
 			dest = ip_vs_try_bind_dest(cp);
 			if (!dest) {
@@ -346,8 +354,22 @@ static void ip_vs_process_message(const char *buffer, const size_t buflen)
 				cp->flags = flags | IP_VS_CONN_F_HASHED;
 			} else
 				atomic_dec(&dest->refcnt);
-		}	/* Note that we don't touch its state and flags
-			   if it is a normal entry. */
+		} else if ((cp->dest) && (cp->protocol == IPPROTO_TCP) &&
+			   (cp->state != state)) {
+			/* update active/inactive flag for the connection */
+			dest = cp->dest;
+			if (!(cp->flags & IP_VS_CONN_F_INACTIVE) &&
+				(state != IP_VS_TCP_S_ESTABLISHED)) {
+				atomic_dec(&dest->activeconns);
+				atomic_inc(&dest->inactconns);
+				cp->flags |= IP_VS_CONN_F_INACTIVE;
+			} else if ((cp->flags & IP_VS_CONN_F_INACTIVE) &&
+				(state == IP_VS_TCP_S_ESTABLISHED)) {
+				atomic_inc(&dest->activeconns);
+				atomic_dec(&dest->inactconns);
+				cp->flags &= ~IP_VS_CONN_F_INACTIVE;
+			}
+		}
 
 		if (flags & IP_VS_CONN_F_SEQ_MASK) {
 			opt = (struct ip_vs_sync_conn_options *)&s[1];
@@ -357,7 +379,7 @@ static void ip_vs_process_message(const char *buffer, const size_t buflen)
 			p += SIMPLE_CONN_SIZE;
 
 		atomic_set(&cp->in_pkts, sysctl_ip_vs_sync_threshold[0]);
-		cp->state = ntohs(s->state);
+		cp->state = state;
 		pp = ip_vs_proto_get(s->protocol);
 		cp->timeout = pp->timeout_table[cp->state];
 		ip_vs_conn_put(cp);