Address registration fix (ARMmbed#1882)

skipped triggering of child update request for
known multicast addresses, removed multicast
entries before processing new address registration
tlv.

source/6LoWPAN/Thread/thread_common.c

@@ -2056,9 +2056,34 @@ static void thread_address_notification_cb(struct protocol_interface_info_entry
     }
 }
 
-void thread_mcast_group_change(struct protocol_interface_info_entry *interface, if_group_entry_t *group, bool addr_added)
+static bool thread_mcast_should_register_address(struct protocol_interface_info_entry *cur, uint8_t *addr)
 {
+    uint8_t thread_realm_local_mcast_addr[16];
+    uint8_t thread_ll_unicast_prefix_based_mcast_addr[16];
+    thread_bootstrap_all_nodes_address_generate(thread_realm_local_mcast_addr, cur->thread_info->threadPrivatePrefixInfo.ulaPrefix, IPV6_SCOPE_REALM_LOCAL);
+    thread_bootstrap_all_nodes_address_generate(thread_ll_unicast_prefix_based_mcast_addr, cur->thread_info->threadPrivatePrefixInfo.ulaPrefix, IPV6_SCOPE_LINK_LOCAL);
+    if (addr_ipv6_multicast_scope(addr) >= IPV6_SCOPE_LINK_LOCAL) {
+        if (memcmp(addr, ADDR_MULTICAST_SOLICITED, 13) == 0) {
+            return false;
+        }
+        if (memcmp(addr, thread_realm_local_mcast_addr, 16) == 0) {
+            return false;
+        }
+        if (memcmp(addr, thread_ll_unicast_prefix_based_mcast_addr, 16) == 0) {
+            return false;
+        }
+        if (memcmp(addr, ADDR_LINK_LOCAL_ALL_NODES, 16) == 0) {
+            return false;
+        }
+        if (memcmp(addr, ADDR_LINK_LOCAL_ALL_ROUTERS, 16) == 0) {
+            return false;
+        }
+    }
+    return true;
+}
 
+void thread_mcast_group_change(struct protocol_interface_info_entry *interface, if_group_entry_t *group, bool addr_added)
+{
     if (thread_attach_ready(interface) != 0) {
         return;
     }
@@ -2067,7 +2092,7 @@ void thread_mcast_group_change(struct protocol_interface_info_entry *interface,
 
     if (thread_bootstrap_should_register_address(interface)) {
         /* Trigger Child Update Request only if MTD child's multicast address change */
-        if (addr_ipv6_multicast_scope(group->group) >= IPV6_SCOPE_LINK_LOCAL) {
+        if (thread_mcast_should_register_address(interface, group->group)) {
             interface->thread_info->childUpdateReqTimer = 1;
         }
     } else {

source/6LoWPAN/Thread/thread_router_bootstrap.c

@@ -1392,7 +1392,7 @@ static void thread_address_registration_tlv_parse(uint8_t *ptr, uint16_t data_le
     uint8_t tempIPv6Address[16];
     uint8_t ctxId;
     bool new_neighbour_created;
-
+    thread_child_mcast_entries_remove(cur,mac64);
     while (data_length) {
         //Read
         ctxId = *ptr++;