[bbr] support domain prefix addition and removal (#4793)

include/openthread/backbone_router_ftd.h

@@ -39,6 +39,7 @@
 
 #include <openthread/backbone_router.h>
 #include <openthread/ip6.h>
+#include <openthread/netdata.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -158,6 +159,18 @@ uint8_t otBackboneRouterGetRegistrationJitter(otInstance *aInstance);
  */
 void otBackboneRouterSetRegistrationJitter(otInstance *aInstance, uint8_t aJitter);
 
+/**
+ * This method gets the local Domain Prefix configuration.
+ *
+ * @param[in]  aInstance A pointer to an OpenThread instance.
+ * @param[out] aConfig   A pointer to the Domain Prefix configuration.
+ *
+ * @retval OT_ERROR_NONE       Successfully got the Domain Prefix configuration.
+ * @retval OT_ERROR_NOT_FOUND  No Domain Prefix was configured.
+ *
+ */
+otError otBackboneRouterGetDomainPrefix(otInstance *aInstance, otBorderRouterConfig *aConfig);
+
 /**
  * @}
  *

include/openthread/netdata.h

@@ -102,6 +102,18 @@ typedef struct otBorderRouterConfig
      */
     bool mStable : 1;
 
+    /**
+     * TRUE, if this border router is able to supply DNS infomration obtained via ND.  FALSE, otherwise.
+     */
+    bool mNdDns : 1;
+
+    /**
+     * TRUE, if this prefix is a Thread Domain Prefix.  FALSE, otherwise.
+     *
+     * Note: Domain Prefix is introduced since Thread 1.2.
+     */
+    bool mDp : 1;
+
     /**
      * The Border Agent Rloc.
      */