Wi-sun BBR Slaac Ula support fix

SLAAC ULA was broken because it never genrate address and thats why RPL never advertisment prefix.

Change-Id: Id02a6712feb60f8204b92349c4bcd80f6e825abc

Author: Juha Heiskanen

source/6LoWPAN/ws/ws_bbr_api.c

@@ -175,21 +175,38 @@ int ws_border_router_proxy_state_update(int8_t caller_interface_id, int8_t handl
     return 0;
 }
 
+static if_address_entry_t *ws_bbr_slaac_generate(protocol_interface_info_entry_t *cur, uint8_t *ula_prefix)
+{
+    if_address_entry_t *add_entry = icmpv6_slaac_address_add(cur, ula_prefix, 64, 0xffffffff, 0xffffffff, true, SLAAC_IID_FIXED);
+    if (!add_entry) {
+        tr_err("ula create failed");
+        return NULL;
+    }
+    addr_policy_table_add_entry(ula_prefix, 64, 2, WS_NON_PREFFRED_LABEL);
+    return add_entry;
+}
+
+static void ws_bbr_slaac_remove(protocol_interface_info_entry_t *cur, uint8_t *ula_prefix)
+{
+    icmpv6_slaac_prefix_update(cur, ula_prefix, 64, 0, 0);
+    addr_policy_table_delete_entry(ula_prefix, 64);
+}
+
+
 static int ws_bbr_static_dodagid_create(protocol_interface_info_entry_t *cur)
 {
     if (memcmp(current_dodag_id, ADDR_UNSPECIFIED, 16) != 0) {
         // address generated
         return 0;
     }
     // This address is only used if no other address available.
-    if_address_entry_t *add_entry = icmpv6_slaac_address_add(cur, static_dodag_id_prefix, 64, 0xffffffff, 0xffffffff, true, SLAAC_IID_FIXED);
+    if_address_entry_t *add_entry = ws_bbr_slaac_generate(cur, static_dodag_id_prefix);
     if (!add_entry) {
         tr_err("dodagid create failed");
         return -1;
     }
     memcpy(current_dodag_id, add_entry->address, 16);
     tr_info("BBR generate DODAGID %s", trace_ipv6(current_dodag_id));
-    addr_policy_table_add_entry(static_dodag_id_prefix, 64, 2, WS_NON_PREFFRED_LABEL);
 
     return 0;
 }
@@ -360,9 +377,16 @@ static void ws_bbr_rpl_status_check(protocol_interface_info_entry_t *cur)
         // Start static ULA prefix and routing always
         if (memcmp(current_local_prefix, ADDR_UNSPECIFIED, 8) != 0) {
             // Remove Old ULA prefix
+            ws_bbr_slaac_remove(cur, current_local_prefix);
             rpl_control_update_dodag_prefix(protocol_6lowpan_rpl_root_dodag, current_local_prefix, 64, PIO_A, 0, 0, true);
+            memset(current_local_prefix, 0, 8);
         }
+
         if (memcmp(local_prefix, ADDR_UNSPECIFIED, 8) != 0) {
+            if (!ws_bbr_slaac_generate(cur, local_prefix)) {
+                return;
+            }
+
             tr_info("RPL Local prefix activate %s", trace_ipv6_prefix(local_prefix, 64));
             rpl_control_update_dodag_prefix(protocol_6lowpan_rpl_root_dodag, local_prefix, 64, PIO_A, WS_ULA_LIFETIME, WS_ULA_LIFETIME, false);
             memcpy(current_local_prefix, local_prefix, 8);
@@ -372,7 +396,7 @@ static void ws_bbr_rpl_status_check(protocol_interface_info_entry_t *cur)
     /*
      * Check if backup ULA prefix is needed
      */
-    if (memcmp(global_prefix, ADDR_UNSPECIFIED, 8) == 0) {
+    if ((configuration & BBR_ULA_C) == 0 && memcmp(global_prefix, ADDR_UNSPECIFIED, 8) == 0) {
         //Global prefix not available count if backup ULA should be created
         global_prefix_unavailable_timer += BBR_CHECK_INTERVAL;
         tr_debug("Check for backup prefix %"PRIu32"", global_prefix_unavailable_timer);