selftests: pmtu: Move route installs to a new function

Move the route add commands to a new function called setup_routing_old.
The '_old' refers to the classic way of installing routes.

Signed-off-by: David Ahern <dsahern@gmail.com>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/net/pmtu.sh

@@ -448,6 +448,20 @@ setup_xfrm6() {
 	setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr}
 }
 
+setup_routing_old() {
+	for i in ${routes}; do
+		[ "${ns}" = "" ]	&& ns="${i}"		&& continue
+		[ "${addr}" = "" ]	&& addr="${i}"		&& continue
+		[ "${gw}" = "" ]	&& gw="${i}"
+
+		ns_name="$(nsname ${ns})"
+
+		ip -n ${ns_name} route add ${addr} via ${gw}
+
+		ns=""; addr=""; gw=""
+	done
+}
+
 setup_routing() {
 	for i in ${NS_R1} ${NS_R2}; do
 		ip netns exec ${i} sysctl -q net/ipv4/ip_forward=1
@@ -478,17 +492,7 @@ setup_routing() {
 		ns=""; peer=""; segment=""
 	done
 
-	for i in ${routes}; do
-		[ "${ns}" = "" ]	&& ns="${i}"		&& continue
-		[ "${addr}" = "" ]	&& addr="${i}"		&& continue
-		[ "${gw}" = "" ]	&& gw="${i}"
-
-		ns_name="$(nsname ${ns})"
-
-		ip -n ${ns_name} route add ${addr} via ${gw}
-
-		ns=""; addr=""; gw=""
-	done
+	setup_routing_old
 }
 
 setup() {