Merge pull request RIOT-OS#20243 from benpicco/gnrc_ipv6_nib_pl_set-r…

…elax

gnrc/nib: allow prefix to be on-link without being used for address

sys/net/gnrc/network_layer/ipv6/nib/nib_pl.c

@@ -52,7 +52,6 @@ int gnrc_ipv6_nib_pl_set(unsigned iface,
     }
 #ifdef MODULE_GNRC_NETIF
     gnrc_netif_t *netif = gnrc_netif_get_by_pid(iface);
-    int idx;
 
     if (netif == NULL) {
         _nib_release();
@@ -64,9 +63,7 @@ int gnrc_ipv6_nib_pl_set(unsigned iface,
      * address resolution towards the LoWPAN and not the upstream interface
      * See https://github.com/RIOT-OS/RIOT/pull/10627 and follow-ups
      */
-    if ((!gnrc_netif_is_6ln(netif) || gnrc_netif_is_6lbr(netif)) &&
-        ((idx = gnrc_netif_ipv6_addr_match(netif, pfx)) >= 0) &&
-        (ipv6_addr_match_prefix(&netif->ipv6.addrs[idx], pfx) >= pfx_len)) {
+    if (!gnrc_netif_is_6ln(netif) || gnrc_netif_is_6lbr(netif)) {
         dst->flags |= _PFX_ON_LINK;
     }