add rule failover support. Failover mode can now be specified on a specific rule. This rule will only direct traffic to a single active interface, on failure of the ping target traffice will be directed out an alternate interface.

note: the one todo item for this feature is to add "stickiness" of an active interface. wlb re-evaluates all rules on an interface state change and this may cause the interface to change for failover mode. supporting this mode requires a less than trivial rewrite of the wlb decision code.:

1 files changed, 9 insertions, 0 deletions

diff --git a/scripts/vyatta-wanloadbalance.pl b/scripts/vyatta-wanloadbalance.pl
index 9e273c5..49cb05b 100644
--- a/scripts/vyatta-wanloadbalance.pl
+++ b/scripts/vyatta-wanloadbalance.pl
@@ -96,6 +96,15 @@ sub write_rules {
 	    print FILE_LCK "\texclude\n";
 	}
 
+	if ($config->exists("$rule failover")) {
+	    print FILE_LCK "\tfailover\n";
+	}
+
+	if ($config->exists("$rule failover") && $config->exists("$rule exclude")) {
+	    print "failover cannot be configured with exclude\n";
+	    exit 1;
+	}
+
 	my $protocol = $config->returnValue("$rule protocol");
 	if (defined $protocol) {
 	    print FILE_LCK "\tprotocol " . $protocol . "\n"