diff --git a/radio/1.0/IRadio.hal b/radio/1.0/IRadio.hal
index d2ffa82..f29b916 100644
--- a/radio/1.0/IRadio.hal
+++ b/radio/1.0/IRadio.hal
@@ -1556,4 +1556,12 @@
      * Response callback is IRadioCallback.getAllowedCarriersResponse()
      */
     oneway getAllowedCarriers(int32_t serial);
+
+    /*
+     * When response type received from a radio indication or radio response is
+     * RadioIndicationType:UNSOLICITED_ACK_EXP or RadioResponseType:SOLICITED_ACK_EXP respectively,
+     * acknowledge the receipt of those messages by sending reseponeAcknowledgement().
+     *
+     */
+    oneway responseAcknowledgement();
 };
\ No newline at end of file
diff --git a/wifi/1.0/default/wifi.cpp b/wifi/1.0/default/wifi.cpp
index fd2cb9c..3475c46 100644
--- a/wifi/1.0/default/wifi.cpp
+++ b/wifi/1.0/default/wifi.cpp
@@ -33,7 +33,8 @@
 using hidl_return_util::validateAndCall;
 
 Wifi::Wifi()
-    : legacy_hal_(new WifiLegacyHal()), run_state_(RunState::STOPPED) {}
+    : legacy_hal_(new legacy_hal::WifiLegacyHal()),
+      run_state_(RunState::STOPPED) {}
 
 bool Wifi::isValid() {
   // This object is always valid.
diff --git a/wifi/1.0/default/wifi.h b/wifi/1.0/default/wifi.h
index c682116..7872303 100644
--- a/wifi/1.0/default/wifi.h
+++ b/wifi/1.0/default/wifi.h
@@ -64,7 +64,7 @@
 
   // Instance is created in this root level |IWifi| HIDL interface object
   // and shared with all the child HIDL interface objects.
-  std::shared_ptr<WifiLegacyHal> legacy_hal_;
+  std::shared_ptr<legacy_hal::WifiLegacyHal> legacy_hal_;
   RunState run_state_;
   std::vector<sp<IWifiEventCallback>> event_callbacks_;
   sp<WifiChip> chip_;
diff --git a/wifi/1.0/default/wifi_ap_iface.cpp b/wifi/1.0/default/wifi_ap_iface.cpp
index 8c38946..b8b7a3a 100644
--- a/wifi/1.0/default/wifi_ap_iface.cpp
+++ b/wifi/1.0/default/wifi_ap_iface.cpp
@@ -27,8 +27,9 @@
 namespace implementation {
 using hidl_return_util::validateAndCall;
 
-WifiApIface::WifiApIface(const std::string& ifname,
-                         const std::weak_ptr<WifiLegacyHal> legacy_hal)
+WifiApIface::WifiApIface(
+    const std::string& ifname,
+    const std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal)
     : ifname_(ifname), legacy_hal_(legacy_hal), is_valid_(true) {}
 
 void WifiApIface::invalidate() {
diff --git a/wifi/1.0/default/wifi_ap_iface.h b/wifi/1.0/default/wifi_ap_iface.h
index 458bdda..ee5dc56 100644
--- a/wifi/1.0/default/wifi_ap_iface.h
+++ b/wifi/1.0/default/wifi_ap_iface.h
@@ -34,7 +34,7 @@
 class WifiApIface : public IWifiApIface {
  public:
   WifiApIface(const std::string& ifname,
-              const std::weak_ptr<WifiLegacyHal> legacy_hal);
+              const std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal);
   // Refer to |WifiChip::invalidate()|.
   void invalidate();
   bool isValid();
@@ -49,7 +49,7 @@
   std::pair<WifiStatus, IfaceType> getTypeInternal();
 
   std::string ifname_;
-  std::weak_ptr<WifiLegacyHal> legacy_hal_;
+  std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal_;
   bool is_valid_;
 
   DISALLOW_COPY_AND_ASSIGN(WifiApIface);
diff --git a/wifi/1.0/default/wifi_chip.cpp b/wifi/1.0/default/wifi_chip.cpp
index 2245288..4d1bce5 100644
--- a/wifi/1.0/default/wifi_chip.cpp
+++ b/wifi/1.0/default/wifi_chip.cpp
@@ -42,7 +42,7 @@
 using hidl_return_util::validateAndCall;
 
 WifiChip::WifiChip(ChipId chip_id,
-                   const std::weak_ptr<WifiLegacyHal> legacy_hal)
+                   const std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal)
     : chip_id_(chip_id), legacy_hal_(legacy_hal), is_valid_(true) {}
 
 void WifiChip::invalidate() {
diff --git a/wifi/1.0/default/wifi_chip.h b/wifi/1.0/default/wifi_chip.h
index 0c8adac..c1a7173 100644
--- a/wifi/1.0/default/wifi_chip.h
+++ b/wifi/1.0/default/wifi_chip.h
@@ -42,7 +42,8 @@
  */
 class WifiChip : public IWifiChip {
  public:
-  WifiChip(ChipId chip_id, const std::weak_ptr<WifiLegacyHal> legacy_hal);
+  WifiChip(ChipId chip_id,
+           const std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal);
   // HIDL does not provide a built-in mechanism to let the server invalidate
   // a HIDL interface object after creation. If any client process holds onto
   // a reference to the object in their context, any method calls on that
@@ -154,7 +155,7 @@
   getDebugHostWakeReasonStatsInternal();
 
   ChipId chip_id_;
-  std::weak_ptr<WifiLegacyHal> legacy_hal_;
+  std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal_;
   std::vector<sp<IWifiChipEventCallback>> event_callbacks_;
   sp<WifiApIface> ap_iface_;
   sp<WifiNanIface> nan_iface_;
diff --git a/wifi/1.0/default/wifi_legacy_hal.cpp b/wifi/1.0/default/wifi_legacy_hal.cpp
index cb254c3..28b7f9a 100644
--- a/wifi/1.0/default/wifi_legacy_hal.cpp
+++ b/wifi/1.0/default/wifi_legacy_hal.cpp
@@ -16,14 +16,19 @@
 
 #include <array>
 
-#include "wifi_legacy_hal.h"
-
 #include <android-base/logging.h>
 #include <cutils/properties.h>
-#include <wifi_system/hal_tool.h>
 #include <wifi_system/interface_tool.h>
 
-namespace {
+#include "wifi_legacy_hal.h"
+
+namespace android {
+namespace hardware {
+namespace wifi {
+namespace V1_0 {
+namespace implementation {
+namespace legacy_hal {
+// Constants used in the class.
 static constexpr uint32_t kMaxVersionStringLength = 256;
 
 // Legacy HAL functions accept "C" style function pointers, so use global
@@ -52,13 +57,8 @@
     on_firmware_memory_dump_internal_callback(buffer, buffer_size);
   }
 }
-}
+// End of the free-standing "C" style callbacks.
 
-namespace android {
-namespace hardware {
-namespace wifi {
-namespace V1_0 {
-namespace implementation {
 WifiLegacyHal::WifiLegacyHal()
     : global_handle_(nullptr),
       wlan_interface_handle_(nullptr),
@@ -69,9 +69,11 @@
   CHECK(!global_handle_ && !wlan_interface_handle_ &&
         !awaiting_event_loop_termination_);
 
-  android::wifi_system::HalTool hal_tool;
   android::wifi_system::InterfaceTool if_tool;
-  if (!hal_tool.InitFunctionTable(&global_func_table_)) {
+  // TODO: Add back the HAL Tool if we need to. All we need from the HAL tool
+  // for now is this function call which we can directly call.
+  wifi_error status = init_wifi_vendor_hal_func_table(&global_func_table_);
+  if (status != WIFI_SUCCESS) {
     LOG(ERROR) << "Failed to initialize legacy hal function table";
     return WIFI_ERROR_UNKNOWN;
   }
@@ -81,7 +83,7 @@
   }
 
   LOG(INFO) << "Starting legacy HAL";
-  wifi_error status = global_func_table_.wifi_initialize(&global_handle_);
+  status = global_func_table_.wifi_initialize(&global_handle_);
   if (status != WIFI_SUCCESS || !global_handle_) {
     LOG(ERROR) << "Failed to retrieve global handle";
     return status;
@@ -141,7 +143,7 @@
   buffer.fill(0);
   wifi_error status = global_func_table_.wifi_get_driver_version(
       wlan_interface_handle_, buffer.data(), buffer.size());
-  return std::make_pair(status, buffer.data());
+  return {status, buffer.data()};
 }
 
 std::pair<wifi_error, std::string> WifiLegacyHal::getFirmwareVersion() {
@@ -149,7 +151,7 @@
   buffer.fill(0);
   wifi_error status = global_func_table_.wifi_get_firmware_version(
       wlan_interface_handle_, buffer.data(), buffer.size());
-  return std::make_pair(status, buffer.data());
+  return {status, buffer.data()};
 }
 
 std::pair<wifi_error, std::vector<uint8_t>>
@@ -164,7 +166,7 @@
   wifi_error status = global_func_table_.wifi_get_driver_memory_dump(
       wlan_interface_handle_, {onDriverMemoryDump});
   on_driver_memory_dump_internal_callback = nullptr;
-  return std::make_pair(status, std::move(driver_dump));
+  return {status, std::move(driver_dump)};
 }
 
 std::pair<wifi_error, std::vector<uint8_t>>
@@ -179,7 +181,29 @@
   wifi_error status = global_func_table_.wifi_get_firmware_memory_dump(
       wlan_interface_handle_, {onFirmwareMemoryDump});
   on_firmware_memory_dump_internal_callback = nullptr;
-  return std::make_pair(status, std::move(firmware_dump));
+  return {status, std::move(firmware_dump)};
+}
+
+std::pair<wifi_error, uint32_t> WifiLegacyHal::getSupportedFeatureSet() {
+  feature_set set;
+  static_assert(sizeof(set) == sizeof(uint32_t),
+                "Some features can not be represented in output");
+  wifi_error status = global_func_table_.wifi_get_supported_feature_set(
+      wlan_interface_handle_, &set);
+  return {status, static_cast<uint32_t>(set)};
+}
+
+std::pair<wifi_error, PacketFilterCapabilities>
+WifiLegacyHal::getPacketFilterCapabilities() {
+  PacketFilterCapabilities caps;
+  wifi_error status = global_func_table_.wifi_get_packet_filter_capabilities(
+      wlan_interface_handle_, &caps.version, &caps.max_len);
+  return {status, caps};
+}
+
+wifi_error WifiLegacyHal::setPacketFilter(const std::vector<uint8_t>& program) {
+  return global_func_table_.wifi_set_packet_filter(
+      wlan_interface_handle_, program.data(), program.size());
 }
 
 wifi_error WifiLegacyHal::retrieveWlanInterfaceHandle() {
@@ -228,6 +252,8 @@
   on_driver_memory_dump_internal_callback = nullptr;
   on_firmware_memory_dump_internal_callback = nullptr;
 }
+
+}  // namespace legacy_hal
 }  // namespace implementation
 }  // namespace V1_0
 }  // namespace wifi
diff --git a/wifi/1.0/default/wifi_legacy_hal.h b/wifi/1.0/default/wifi_legacy_hal.h
index d817184..8bd146a 100644
--- a/wifi/1.0/default/wifi_legacy_hal.h
+++ b/wifi/1.0/default/wifi_legacy_hal.h
@@ -21,13 +21,23 @@
 #include <thread>
 #include <vector>
 
-#include <hardware_legacy/wifi_hal.h>
-
 namespace android {
 namespace hardware {
 namespace wifi {
 namespace V1_0 {
 namespace implementation {
+// This is in a separate namespace to prevent typename conflicts between
+// the legacy HAL types and the HIDL interface types.
+namespace legacy_hal {
+// Wrap all the types defined inside the legacy HAL header files inside this
+// namespace.
+#include <hardware_legacy/wifi_hal.h>
+
+// APF capabilities supported by the iface.
+struct PacketFilterCapabilities {
+  uint32_t version;
+  uint32_t max_len;
+};
 
 /**
  * Class that encapsulates all legacy HAL interactions.
@@ -51,6 +61,10 @@
   std::pair<wifi_error, std::string> getFirmwareVersion();
   std::pair<wifi_error, std::vector<uint8_t>> requestDriverMemoryDump();
   std::pair<wifi_error, std::vector<uint8_t>> requestFirmwareMemoryDump();
+  std::pair<wifi_error, uint32_t> getSupportedFeatureSet();
+  // APF functions.
+  std::pair<wifi_error, PacketFilterCapabilities> getPacketFilterCapabilities();
+  wifi_error setPacketFilter(const std::vector<uint8_t>& program);
 
  private:
   // Retrieve the interface handle to be used for the "wlan" interface.
@@ -71,6 +85,7 @@
   bool awaiting_event_loop_termination_;
 };
 
+}  // namespace legacy_hal
 }  // namespace implementation
 }  // namespace V1_0
 }  // namespace wifi
diff --git a/wifi/1.0/default/wifi_nan_iface.cpp b/wifi/1.0/default/wifi_nan_iface.cpp
index a2190a8..48e75a5 100644
--- a/wifi/1.0/default/wifi_nan_iface.cpp
+++ b/wifi/1.0/default/wifi_nan_iface.cpp
@@ -27,8 +27,9 @@
 namespace implementation {
 using hidl_return_util::validateAndCall;
 
-WifiNanIface::WifiNanIface(const std::string& ifname,
-                           const std::weak_ptr<WifiLegacyHal> legacy_hal)
+WifiNanIface::WifiNanIface(
+    const std::string& ifname,
+    const std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal)
     : ifname_(ifname), legacy_hal_(legacy_hal), is_valid_(true) {}
 
 void WifiNanIface::invalidate() {
diff --git a/wifi/1.0/default/wifi_nan_iface.h b/wifi/1.0/default/wifi_nan_iface.h
index f3c0640..4f89b31 100644
--- a/wifi/1.0/default/wifi_nan_iface.h
+++ b/wifi/1.0/default/wifi_nan_iface.h
@@ -35,7 +35,7 @@
 class WifiNanIface : public IWifiNanIface {
  public:
   WifiNanIface(const std::string& ifname,
-               const std::weak_ptr<WifiLegacyHal> legacy_hal);
+               const std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal);
   // Refer to |WifiChip::invalidate()|.
   void invalidate();
   bool isValid();
@@ -135,7 +135,7 @@
   WifiStatus dataEndInternal(uint32_t cmd_id, const NanDataPathEndRequest& msg);
 
   std::string ifname_;
-  std::weak_ptr<WifiLegacyHal> legacy_hal_;
+  std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal_;
   std::vector<sp<IWifiNanIfaceEventCallback>> event_callbacks_;
   bool is_valid_;
 
diff --git a/wifi/1.0/default/wifi_p2p_iface.cpp b/wifi/1.0/default/wifi_p2p_iface.cpp
index 65258ba..0d055f1 100644
--- a/wifi/1.0/default/wifi_p2p_iface.cpp
+++ b/wifi/1.0/default/wifi_p2p_iface.cpp
@@ -27,8 +27,9 @@
 namespace implementation {
 using hidl_return_util::validateAndCall;
 
-WifiP2pIface::WifiP2pIface(const std::string& ifname,
-                           const std::weak_ptr<WifiLegacyHal> legacy_hal)
+WifiP2pIface::WifiP2pIface(
+    const std::string& ifname,
+    const std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal)
     : ifname_(ifname), legacy_hal_(legacy_hal), is_valid_(true) {}
 
 void WifiP2pIface::invalidate() {
diff --git a/wifi/1.0/default/wifi_p2p_iface.h b/wifi/1.0/default/wifi_p2p_iface.h
index d4656e1..d2982db 100644
--- a/wifi/1.0/default/wifi_p2p_iface.h
+++ b/wifi/1.0/default/wifi_p2p_iface.h
@@ -34,7 +34,7 @@
 class WifiP2pIface : public IWifiP2pIface {
  public:
   WifiP2pIface(const std::string& ifname,
-               const std::weak_ptr<WifiLegacyHal> legacy_hal);
+               const std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal);
   // Refer to |WifiChip::invalidate()|.
   void invalidate();
   bool isValid();
@@ -49,7 +49,7 @@
   std::pair<WifiStatus, IfaceType> getTypeInternal();
 
   std::string ifname_;
-  std::weak_ptr<WifiLegacyHal> legacy_hal_;
+  std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal_;
   bool is_valid_;
 
   DISALLOW_COPY_AND_ASSIGN(WifiP2pIface);
diff --git a/wifi/1.0/default/wifi_rtt_controller.cpp b/wifi/1.0/default/wifi_rtt_controller.cpp
index dbe836b..6ac0629 100644
--- a/wifi/1.0/default/wifi_rtt_controller.cpp
+++ b/wifi/1.0/default/wifi_rtt_controller.cpp
@@ -29,7 +29,7 @@
 
 WifiRttController::WifiRttController(
     const sp<IWifiIface>& bound_iface,
-    const std::weak_ptr<WifiLegacyHal> legacy_hal)
+    const std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal)
     : bound_iface_(bound_iface), legacy_hal_(legacy_hal), is_valid_(true) {}
 
 void WifiRttController::invalidate() {
diff --git a/wifi/1.0/default/wifi_rtt_controller.h b/wifi/1.0/default/wifi_rtt_controller.h
index 5ebd4bc..3dd5340 100644
--- a/wifi/1.0/default/wifi_rtt_controller.h
+++ b/wifi/1.0/default/wifi_rtt_controller.h
@@ -36,7 +36,7 @@
 class WifiRttController : public IWifiRttController {
  public:
   WifiRttController(const sp<IWifiIface>& bound_iface,
-                    const std::weak_ptr<WifiLegacyHal> legacy_hal);
+                    const std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal);
   // Refer to |WifiChip::invalidate()|.
   void invalidate();
   bool isValid();
@@ -103,7 +103,7 @@
   WifiStatus disableResponderInternal(uint32_t cmd_id);
 
   sp<IWifiIface> bound_iface_;
-  std::weak_ptr<WifiLegacyHal> legacy_hal_;
+  std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal_;
   std::vector<sp<IWifiRttControllerEventCallback>> event_callbacks_;
   bool is_valid_;
 
diff --git a/wifi/1.0/default/wifi_sta_iface.cpp b/wifi/1.0/default/wifi_sta_iface.cpp
index 1f220f3..6365032 100644
--- a/wifi/1.0/default/wifi_sta_iface.cpp
+++ b/wifi/1.0/default/wifi_sta_iface.cpp
@@ -27,8 +27,9 @@
 namespace implementation {
 using hidl_return_util::validateAndCall;
 
-WifiStaIface::WifiStaIface(const std::string& ifname,
-                           const std::weak_ptr<WifiLegacyHal> legacy_hal)
+WifiStaIface::WifiStaIface(
+    const std::string& ifname,
+    const std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal)
     : ifname_(ifname), legacy_hal_(legacy_hal), is_valid_(true) {}
 
 void WifiStaIface::invalidate() {
diff --git a/wifi/1.0/default/wifi_sta_iface.h b/wifi/1.0/default/wifi_sta_iface.h
index a13feeb..09a883c 100644
--- a/wifi/1.0/default/wifi_sta_iface.h
+++ b/wifi/1.0/default/wifi_sta_iface.h
@@ -35,7 +35,7 @@
 class WifiStaIface : public IWifiStaIface {
  public:
   WifiStaIface(const std::string& ifname,
-               const std::weak_ptr<WifiLegacyHal> legacy_hal);
+               const std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal);
   // Refer to |WifiChip::invalidate()|.
   void invalidate();
   bool isValid();
@@ -107,7 +107,7 @@
   getDebugRxPacketFatesInternal();
 
   std::string ifname_;
-  std::weak_ptr<WifiLegacyHal> legacy_hal_;
+  std::weak_ptr<legacy_hal::WifiLegacyHal> legacy_hal_;
   std::vector<sp<IWifiStaIfaceEventCallback>> event_callbacks_;
   bool is_valid_;