Added validation at MAC ack buffer handler

We need to verify that ACK buffer is valid for current active buffer. Otherwise it may mean that wrong TX process is finished by wrong ACK.

Author: Juha Heiskanen

source/MAC/IEEE802_15_4/mac_mcps_sap.c

@@ -1183,15 +1183,24 @@ static void mac_pd_data_confirm_failure_handle(protocol_interface_rf_mac_setup_s
     mcps_data_confirm_cb(rf_mac_setup, &mcps_data_conf, NULL);
 }
 
+
 static void mac_pd_data_ack_handler(mac_pre_parsed_frame_t *buf)
 {
     protocol_interface_rf_mac_setup_s *rf_mac_setup = buf->mac_class_ptr;
 
     if (!rf_mac_setup->active_pd_data_request) {
         mcps_sap_pre_parsed_frame_buffer_free(buf);
+        tr_debug("RX ack without active buffer");
     } else {
         mac_pre_build_frame_t *buffer = rf_mac_setup->active_pd_data_request;
 
+        //Validate here ack is proper to active buffer
+        if (!mac_pd_sap_ack_validation(rf_mac_setup, &buf->fcf_dsn, mac_header_message_start_pointer(buf))) {
+            tr_debug("Not a valid ACK for active tx process");
+            mcps_sap_pre_parsed_frame_buffer_free(buf);
+            return;
+        }
+
         if (mac_ack_sap_rx_handler(buf, rf_mac_setup)) {
             //Do not forward ACK payload but Accept ACK
             mcps_sap_pre_parsed_frame_buffer_free(buf);

source/MAC/IEEE802_15_4/mac_pd_sap.c

@@ -655,12 +655,16 @@ static int8_t mac_data_interface_tx_done_by_ack_cb(protocol_interface_rf_mac_set
     return 0;
 }
 
-static bool mac_pd_sap_ack_validation(protocol_interface_rf_mac_setup_s *rf_ptr, const mac_fcf_sequence_t *fcf_dsn, const uint8_t *data_ptr)
+bool mac_pd_sap_ack_validation(protocol_interface_rf_mac_setup_s *rf_ptr, const mac_fcf_sequence_t *fcf_dsn, const uint8_t *data_ptr)
 {
-    if (!rf_ptr->active_pd_data_request || !rf_ptr->active_pd_data_request->fcf_dsn.ackRequested) {
+    if (!rf_ptr->active_pd_data_request || (!rf_ptr->active_pd_data_request->fcf_dsn.ackRequested && !rf_ptr->active_pd_data_request->ExtendedFrameExchange)) {
         return false; //No active Data request anymore or no ACK request for current TX
     }
 
+    if (rf_ptr->active_pd_data_request->ExtendedFrameExchange && fcf_dsn->frametype == FC_DATA_FRAME) {
+        return true;//EFDE final message
+    }
+
     if (fcf_dsn->frameVersion != rf_ptr->active_pd_data_request->fcf_dsn.frameVersion) {
         return false;
     }

source/MAC/IEEE802_15_4/mac_pd_sap.h

@@ -26,6 +26,7 @@
 
 struct protocol_interface_rf_mac_setup;
 struct arm_phy_sap_msg_s;
+struct mac_fcf_sequence_s;
 
 #define ENHANCED_ACK_NEIGHBOUR_POLL_MAX_TIME_US 3500
 
@@ -61,4 +62,6 @@ void mac_pd_sap_state_machine(struct protocol_interface_rf_mac_setup *rf_mac_set
 
 int8_t mac_data_edfe_force_stop(struct protocol_interface_rf_mac_setup *rf_ptr);
 
+bool mac_pd_sap_ack_validation(struct protocol_interface_rf_mac_setup *rf_ptr, const struct mac_fcf_sequence_s *fcf_dsn, const uint8_t *data_ptr);
+
 #endif /* MAC_PD_SAP_H_ */

test/nanostack/unittest/stub/mac_pd_sap_stub.c

@@ -87,3 +87,8 @@ int8_t mac_data_edfe_force_stop(struct protocol_interface_rf_mac_setup *rf_ptr)
 {
     return 0;
 }
+
+bool mac_pd_sap_ack_validation(struct protocol_interface_rf_mac_setup *rf_ptr, const struct mac_fcf_sequence_s *fcf_dsn, const uint8_t *data_ptr)
+{
+    return true;
+}