ctdb-scripts: New functions ip6tables() and iptables_wrapper()

ip6tables() uses the same lock as iptables().  This is done on
suspicion.

iptables_wrapper() takes 1st argument "inet" or "inet6", and the rest
is passed to the correct iptables variant.

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>

ctdb/config/functions

@@ -1356,10 +1356,23 @@ ctdb_standard_event_handler ()
 }
 
 # iptables doesn't like being re-entered, so flock-wrap it.
-iptables()
+iptables ()
 {
 	flock -w 30 $CTDB_VARDIR/iptables-ctdb.flock /sbin/iptables "$@"
 }
+ip6tables ()
+{
+	flock -w 30 $CTDB_VARDIR/iptables-ctdb.flock /sbin/ip6tables "$@"
+}
+iptables_wrapper ()
+{
+    _family="$1" ; shift
+    if [ "$_family" = "inet6" ] ; then
+	ip6tables "$@"
+    else
+	iptables "$@"
+    fi
+}
 
 # AIX (and perhaps others?) doesn't have mktemp
 if ! which mktemp >/dev/null 2>&1 ; then