ip6: fix ip6 address deletion

We couldn't add a previously added IPv6 on an interface, either through
the command line, or for link local ip when we add/delete/add an interface.

In rib6_cleanup, call rib6_delete with the prefixlen instead of the max
prefix.

Add these checks in the existing test.

Signed-off-by: Christophe Fontaine <[email protected]>

Author: christophefontaine

modules/ip6/control/route.c

@@ -393,7 +393,7 @@ void rib6_cleanup(struct nexthop *nh) {
 	struct rte_rib6 *rib;
 	uintptr_t nh_id;
 
-	rib6_delete(nh->vrf_id, nh->iface_id, &nh->ipv6, RTE_IPV6_MAX_DEPTH);
+	rib6_delete(nh->vrf_id, nh->iface_id, &nh->ipv6, nh->prefixlen);
 	local_ip = nh->ipv6;
 	local_depth = nh->prefixlen;
 

smoke/ip6_add_del_test.sh

@@ -6,9 +6,13 @@
 
 p0=${run_id}0
 
+grcli add interface port $p0 devargs net_tap0,iface=$p0 mac f0:0d:ac:dc:00:00
+grcli del interface $p0
 grcli add interface port $p0 devargs net_tap0,iface=$p0 mac f0:0d:ac:dc:00:00
 
 grcli add ip6 address 2001::1/64 iface $p0
 grcli show ip6 address
 grcli del ip6 address 2001::1/64 iface $p0
 grcli show ip6 address
+grcli add ip6 address 2001::1/64 iface $p0
+grcli show ip6 address