Address registration changes for MED and SED (ARMmbed#1863)

updated address registration tlv in child id request
from MED and SED to contain only ML-EID.
Other addresses are registered separately in
Child update request that is triggered
immediately after receiving child id response.

Author: deepakvenugopal

source/6LoWPAN/Thread/thread_bootstrap.c

@@ -1170,6 +1170,10 @@ void thread_bootstrap_ready(protocol_interface_info_entry_t *cur)
         thread_leader_service_generate_network_data(cur);
     }
 
+    if (thread_addresses_needs_to_be_registered(cur)) {
+        thread_info(cur)->childUpdateReqTimer = 1;
+    }
+
     cur->bootsrap_state_machine_cnt = 0;
     mac_data_poll_protocol_poll_mode_decrement(cur);
 }

source/6LoWPAN/Thread/thread_common.c

@@ -1736,6 +1736,96 @@ uint8_t *thread_leader_data_tlv_write(uint8_t *ptr, protocol_interface_info_entr
     return ptr;
 }
 
+bool thread_addresses_needs_to_be_registered(protocol_interface_info_entry_t *cur)
+{
+    lowpan_context_t *ctx;
+    uint8_t thread_realm_local_mcast_addr[16];
+    if (thread_info(cur)->thread_device_mode != THREAD_DEVICE_MODE_SLEEPY_END_DEVICE &&
+            thread_info(cur)->thread_device_mode != THREAD_DEVICE_MODE_END_DEVICE) {
+        // No address registration for others than MED or SED
+        return false;
+    }
+
+    // check for addresses
+    ns_list_foreach(if_address_entry_t, e, &cur->ip_addresses) {
+        if (addr_ipv6_scope(e->address, cur) == IPV6_SCOPE_GLOBAL || (addr_ipv6_scope(e->address, cur) == IPV6_SCOPE_REALM_LOCAL
+                && !thread_addr_is_mesh_local_16(e->address, cur))) {
+            ctx = lowpan_context_get_by_address(&cur->lowpan_contexts, e->address);
+            if (!ctx) {
+                return true;
+            }
+            if (ctx->cid != 0) {
+                return true;
+
+            }
+        }
+    }
+
+    // check for multicast groups
+    thread_bootstrap_all_nodes_address_generate(thread_realm_local_mcast_addr, cur->thread_info->threadPrivatePrefixInfo.ulaPrefix, 3);
+    ns_list_foreach(if_group_entry_t, entry, &cur->ip_groups)
+    {
+        if (addr_ipv6_multicast_scope(entry->group) < IPV6_SCOPE_REALM_LOCAL) {
+            /* Skip Link Local multicast address */
+            continue;
+        }
+
+        if (addr_ipv6_equal(entry->group, thread_realm_local_mcast_addr)) {
+            /* Skip well-known realm-local all Thread nodes multicast address */
+            continue;
+        }
+        if (addr_ipv6_equal(entry->group, ADDR_ALL_MPL_FORWARDERS)) {
+            /* Skip All MPL Forwarders address */
+            continue;
+        }
+        if (addr_ipv6_equal(entry->group, ADDR_REALM_LOCAL_ALL_NODES)) {
+            /* Skip Mesh local all nodes */
+            continue;
+        }
+        if (addr_ipv6_equal(entry->group, ADDR_REALM_LOCAL_ALL_ROUTERS)) {
+            /* Skip Mesh local all routers */
+            continue;
+        }
+        return true;
+    }
+    return false;
+}
+
+uint8_t *thread_ml_address_tlv_write(uint8_t *ptr, protocol_interface_info_entry_t *cur)
+{
+    lowpan_context_t *ctx;
+    uint8_t *address_len_ptr;
+
+    if (thread_info(cur)->thread_device_mode != THREAD_DEVICE_MODE_SLEEPY_END_DEVICE &&
+        thread_info(cur)->thread_device_mode != THREAD_DEVICE_MODE_END_DEVICE) {
+        // No address registration for others than MED or SED
+        return ptr;
+    }
+    *ptr++ = MLE_TYPE_ADDRESS_REGISTRATION;
+    address_len_ptr = ptr++;
+
+    *address_len_ptr = 0;
+
+    ns_list_foreach(if_address_entry_t, e, &cur->ip_addresses) {
+
+        if (*address_len_ptr > 148 ) {
+            // Maximum length of address registrations
+            continue;
+        }
+        if (!thread_addr_is_mesh_local_16(e->address, cur)) {
+            ctx = lowpan_context_get_by_address(&cur->lowpan_contexts, e->address);
+            if (ctx && ctx->cid == 0) {
+                //Write TLV to list
+                *ptr++ = (ctx->cid | 0x80);
+                memcpy(ptr, e->address + 8, 8);
+                ptr += 8;
+                *address_len_ptr += 9;
+            }
+        }
+    }
+    return ptr;
+}
+
 uint8_t *thread_address_registration_tlv_write(uint8_t *ptr, protocol_interface_info_entry_t *cur)
 {
     uint8_t thread_realm_local_mcast_addr[16];

source/6LoWPAN/Thread/thread_common.h

@@ -398,6 +398,11 @@ void thread_child_mcast_entries_remove(protocol_interface_info_entry_t *cur, con
 uint8_t thread_leader_data_tlv_size(protocol_interface_info_entry_t *cur);
 uint8_t *thread_leader_data_tlv_write(uint8_t *ptr, protocol_interface_info_entry_t *cur);
 uint8_t *thread_address_registration_tlv_write(uint8_t *ptr, protocol_interface_info_entry_t *cur);
+
+// returns true if SED/MED needs to register additional address to parent
+bool thread_addresses_needs_to_be_registered(protocol_interface_info_entry_t *cur);
+// write mesh local address tlv
+uint8_t *thread_ml_address_tlv_write(uint8_t *ptr, protocol_interface_info_entry_t *cur);
 int thread_link_reject_send(protocol_interface_info_entry_t *interface, const uint8_t *ll64);
 thread_leader_info_t *thread_allocate_and_init_leader_private_data(void);
 thread_route_cost_t thread_link_quality_to_cost(thread_link_quality_e quality);

source/6LoWPAN/Thread/thread_host_bootstrap.c

@@ -1124,7 +1124,7 @@ static int thread_attach_child_id_request_build(protocol_interface_info_entry_t
 
     //Add ML-EID
     if ((mode & MLE_FFD_DEV) == 0) {
-        ptr = thread_address_registration_tlv_write(ptr, cur);
+        ptr = thread_ml_address_tlv_write(ptr,cur);
     }
 
     reqTlvCnt = 2;

test/nanostack/unittest/stub/thread_common_stub.c

@@ -417,3 +417,7 @@ void thread_maintenance_timer_set(protocol_interface_info_entry_t *cur, uint16_t
 {
 
 }
+bool thread_addresses_needs_to_be_registered(protocol_interface_info_entry_t *cur)
+{
+    return true;
+}