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++;