wi-sun address registration fix:

Added EUI64 to function which validate space for registered child address.
If EUI64 is used already at any registered address limit counter check is not necessary anymore.

Change-Id: Id602ffee21da26d1c92662dffe54cbd920627186

Author: Juha Heiskanen

source/6LoWPAN/ND/nd_router_object.c

@@ -926,7 +926,7 @@ bool nd_ns_aro_handler(protocol_interface_info_entry_t *cur_interface, const uin
 
     /* TODO - check hard upper limit on registrations? */
     if (ws_info(cur_interface) &&
-            !ws_common_allow_child_registration(cur_interface)) {
+            !ws_common_allow_child_registration(cur_interface, aro_out->eui64)) {
         aro_out->present = true;
         aro_out->status = ARO_FULL;
         return true;

source/6LoWPAN/ws/ws_common.c

@@ -363,7 +363,10 @@ void ws_common_neighbor_remove(protocol_interface_info_entry_t *cur, const uint8
     tr_debug("neighbor remove %s", trace_ipv6(ll_address));
     ws_bootstrap_neighbor_remove(cur, ll_address);
 }
-bool ws_common_allow_child_registration(protocol_interface_info_entry_t *interface)
+
+
+
+bool ws_common_allow_child_registration(protocol_interface_info_entry_t *interface, const uint8_t *eui64)
 {
     uint8_t child_count = 0;
     uint8_t max_child_count = mac_neighbor_info(interface)->list_total_size - WS_NON_CHILD_NEIGHBOUR_COUNT;
@@ -373,6 +376,12 @@ bool ws_common_allow_child_registration(protocol_interface_info_entry_t *interfa
         max_child_count = test_max_child_count_override;
     }
 
+    //Validate Is EUI64 already allocated for any address
+    if (ipv6_neighbour_has_registered_by_eui64(&interface->ipv6_neighbour_cache, eui64)) {
+        tr_info("Child registration from old child");
+        return true;
+    }
+
     ns_list_foreach_safe(mac_neighbor_table_entry_t, cur, &mac_neighbor_info(interface)->neighbour_list) {
 
         if (ipv6_neighbour_has_registered_by_eui64(&interface->ipv6_neighbour_cache, cur->mac64)) {

source/6LoWPAN/ws/ws_common.h

@@ -121,7 +121,7 @@ void ws_common_aro_failure(protocol_interface_info_entry_t *cur, const uint8_t *
 
 void ws_common_neighbor_remove(protocol_interface_info_entry_t *cur, const uint8_t *ll_address);
 
-bool ws_common_allow_child_registration(protocol_interface_info_entry_t *cur);
+bool ws_common_allow_child_registration(protocol_interface_info_entry_t *cur, const uint8_t *eui64);
 
 #define ws_info(cur) ((cur)->ws_info)
 #else
@@ -131,7 +131,7 @@ bool ws_common_allow_child_registration(protocol_interface_info_entry_t *cur);
 #define ws_common_aro_failure(cur, ll_address)
 #define ws_common_neighbor_remove(cur, ll_address)
 #define ws_common_fast_timer(cur, ticks) ((void) 0)
-#define ws_common_allow_child_registration(cur) (false)
+#define ws_common_allow_child_registration(cur, eui64) (false)
 
 
 #endif //HAVE_WS

test/nanostack/unittest/stub/ws_common_stub.c

@@ -62,7 +62,7 @@ void ws_common_neighbor_update(protocol_interface_info_entry_t *cur, const uint8
     (void) cur;
     (void) ll_address;
 }
-bool ws_common_allow_child_registration(protocol_interface_info_entry_t *interface)
+bool ws_common_allow_child_registration(protocol_interface_info_entry_t *interface, const uint8_t *eui64)
 {
     (void) interface;
     return true;