gnrc_ndp: only lookup non-link-local addresses in FIB

sys/net/network_layer/ng_ndp/node/ng_ndp_node.c

@@ -59,24 +59,27 @@ kernel_pid_t ng_ndp_node_next_hop_l2addr(uint8_t *l2addr, uint8_t *l2addr_len,
                                          kernel_pid_t iface, ipv6_addr_t *dst,
                                          ng_pktsnip_t *pkt)
 {
+    ng_ipv6_nc_t *nc_entry;
     ipv6_addr_t *next_hop_ip = NULL, *prefix = NULL;
 
 #ifdef MODULE_NG_IPV6_EXT_RH
     next_hop_ip = ng_ipv6_ext_rh_next_hop(hdr);
 #endif
 #ifdef MODULE_FIB
-    size_t next_hop_size = sizeof(ipv6_addr_t);
-    uint32_t next_hop_flags = 0;
-    ipv6_addr_t next_hop_actual;    /* FIB copies address into this variable */
-
-    if ((next_hop_ip == NULL) &&
-        (fib_get_next_hop(&iface, next_hop_actual.u8, &next_hop_size,
-                          &next_hop_flags, (uint8_t *)dst,
-                          sizeof(ipv6_addr_t), 0) >= 0) &&
-        (next_hop_size == sizeof(ipv6_addr_t))) {
-        next_hop_ip = &next_hop_actual;
+    /* don't look-up link local addresses in FIB */
+    if (!ipv6_addr_is_link_local(dst)) {
+        size_t next_hop_size = sizeof(ipv6_addr_t);
+        uint32_t next_hop_flags = 0;
+        ipv6_addr_t next_hop_actual;    /* FIB copies address into this variable */
+
+        if ((next_hop_ip == NULL) &&
+            (fib_get_next_hop(&iface, next_hop_actual.u8, &next_hop_size,
+                              &next_hop_flags, (uint8_t *)dst,
+                              sizeof(ipv6_addr_t), 0) >= 0) &&
+            (next_hop_size == sizeof(ipv6_addr_t))) {
+            next_hop_ip = &next_hop_actual;
+        }
     }
-
 #endif
 
     if ((next_hop_ip == NULL)) {            /* no route to host */