diff --git a/wifi/1.3/default/Android.mk b/wifi/1.3/default/Android.mk
index 199ea3b..1f91861 100644
--- a/wifi/1.3/default/Android.mk
+++ b/wifi/1.3/default/Android.mk
@@ -142,12 +142,14 @@
 LOCAL_SRC_FILES := \
     tests/hidl_struct_util_unit_tests.cpp \
     tests/main.cpp \
+    tests/mock_interface_tool.cpp \
     tests/mock_wifi_feature_flags.cpp \
     tests/mock_wifi_iface_util.cpp \
     tests/mock_wifi_legacy_hal.cpp \
     tests/mock_wifi_mode_controller.cpp \
     tests/ringbuffer_unit_tests.cpp \
     tests/wifi_ap_iface_unit_tests.cpp \
+    tests/wifi_nan_iface_unit_tests.cpp \
     tests/wifi_chip_unit_tests.cpp \
     tests/wifi_iface_util_unit_tests.cpp
 LOCAL_STATIC_LIBRARIES := \
diff --git a/wifi/1.3/default/service.cpp b/wifi/1.3/default/service.cpp
index 73015cf..fcbc37c 100644
--- a/wifi/1.3/default/service.cpp
+++ b/wifi/1.3/default/service.cpp
@@ -48,12 +48,14 @@
 
     configureRpcThreadpool(1, true /* callerWillJoin */);
 
+    const auto iface_tool =
+        std::make_shared<android::wifi_system::InterfaceTool>();
     // Setup hwbinder service
     android::sp<android::hardware::wifi::V1_3::IWifi> service =
         new android::hardware::wifi::V1_3::implementation::Wifi(
-            std::make_shared<WifiLegacyHal>(),
+            iface_tool, std::make_shared<WifiLegacyHal>(iface_tool),
             std::make_shared<WifiModeController>(),
-            std::make_shared<WifiIfaceUtil>(),
+            std::make_shared<WifiIfaceUtil>(iface_tool),
             std::make_shared<WifiFeatureFlags>());
     if (kLazyService) {
         LazyServiceRegistrar registrar;
diff --git a/wifi/1.3/default/tests/mock_interface_tool.cpp b/wifi/1.3/default/tests/mock_interface_tool.cpp
new file mode 100644
index 0000000..b99a164
--- /dev/null
+++ b/wifi/1.3/default/tests/mock_interface_tool.cpp
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <android-base/logging.h>
+#include <android-base/macros.h>
+#include <gmock/gmock.h>
+
+#undef NAN  // This is weird, NAN is defined in bionic/libc/include/math.h:38
+#include "mock_interface_tool.h"
+
+namespace android {
+namespace wifi_system {
+
+MockInterfaceTool::MockInterfaceTool() {}
+
+}  // namespace wifi_system
+}  // namespace android
diff --git a/wifi/1.3/default/tests/mock_interface_tool.h b/wifi/1.3/default/tests/mock_interface_tool.h
new file mode 100644
index 0000000..0f17551
--- /dev/null
+++ b/wifi/1.3/default/tests/mock_interface_tool.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MOCK_INTERFACE_TOOL_H
+#define MOCK_INTERFACE_TOOL_H
+
+#include <gmock/gmock.h>
+#include <wifi_system/interface_tool.h>
+
+namespace android {
+namespace wifi_system {
+
+class MockInterfaceTool : public InterfaceTool {
+   public:
+    MockInterfaceTool();
+
+    MOCK_METHOD1(GetUpState, bool(const char* if_name));
+    MOCK_METHOD2(SetUpState, bool(const char* if_name, bool request_up));
+    MOCK_METHOD1(SetWifiUpState, bool(bool request_up));
+    MOCK_METHOD2(SetMacAddress,
+                 bool(const char* if_name,
+                      const std::array<uint8_t, ETH_ALEN>& address));
+    MOCK_METHOD1(GetFactoryMacAddress,
+                 std::array<uint8_t, ETH_ALEN>(const char* if_name));
+
+};  // class MockInterfaceTool
+
+}  // namespace wifi_system
+}  // namespace android
+
+#endif  // MOCK_INTERFACE_TOOL_H
diff --git a/wifi/1.3/default/tests/mock_wifi_iface_util.cpp b/wifi/1.3/default/tests/mock_wifi_iface_util.cpp
index 706cb6a..3d877c0 100644
--- a/wifi/1.3/default/tests/mock_wifi_iface_util.cpp
+++ b/wifi/1.3/default/tests/mock_wifi_iface_util.cpp
@@ -28,7 +28,9 @@
 namespace implementation {
 namespace iface_util {
 
-MockWifiIfaceUtil::MockWifiIfaceUtil() : WifiIfaceUtil() {}
+MockWifiIfaceUtil::MockWifiIfaceUtil(
+    const std::weak_ptr<wifi_system::InterfaceTool> iface_tool)
+    : WifiIfaceUtil(iface_tool) {}
 }  // namespace iface_util
 }  // namespace implementation
 }  // namespace V1_3
diff --git a/wifi/1.3/default/tests/mock_wifi_iface_util.h b/wifi/1.3/default/tests/mock_wifi_iface_util.h
index 87ab5db..8ec93eb 100644
--- a/wifi/1.3/default/tests/mock_wifi_iface_util.h
+++ b/wifi/1.3/default/tests/mock_wifi_iface_util.h
@@ -30,12 +30,16 @@
 
 class MockWifiIfaceUtil : public WifiIfaceUtil {
    public:
-    MockWifiIfaceUtil();
+    MockWifiIfaceUtil(
+        const std::weak_ptr<wifi_system::InterfaceTool> iface_tool);
     MOCK_METHOD1(getFactoryMacAddress,
                  std::array<uint8_t, 6>(const std::string&));
     MOCK_METHOD2(setMacAddress,
                  bool(const std::string&, const std::array<uint8_t, 6>&));
     MOCK_METHOD0(getOrCreateRandomMacAddress, std::array<uint8_t, 6>());
+    MOCK_METHOD2(registerIfaceEventHandlers,
+                 void(const std::string&, IfaceEventHandlers));
+    MOCK_METHOD1(unregisterIfaceEventHandlers, void(const std::string&));
 };
 }  // namespace iface_util
 }  // namespace implementation
diff --git a/wifi/1.3/default/tests/mock_wifi_legacy_hal.cpp b/wifi/1.3/default/tests/mock_wifi_legacy_hal.cpp
index 4cd279d..0a202c4 100644
--- a/wifi/1.3/default/tests/mock_wifi_legacy_hal.cpp
+++ b/wifi/1.3/default/tests/mock_wifi_legacy_hal.cpp
@@ -28,7 +28,9 @@
 namespace implementation {
 namespace legacy_hal {
 
-MockWifiLegacyHal::MockWifiLegacyHal() : WifiLegacyHal() {}
+MockWifiLegacyHal::MockWifiLegacyHal(
+    const std::weak_ptr<wifi_system::InterfaceTool> iface_tool)
+    : WifiLegacyHal(iface_tool) {}
 }  // namespace legacy_hal
 }  // namespace implementation
 }  // namespace V1_3
diff --git a/wifi/1.3/default/tests/mock_wifi_legacy_hal.h b/wifi/1.3/default/tests/mock_wifi_legacy_hal.h
index 53fa8d6..81cb1de 100644
--- a/wifi/1.3/default/tests/mock_wifi_legacy_hal.h
+++ b/wifi/1.3/default/tests/mock_wifi_legacy_hal.h
@@ -30,7 +30,8 @@
 
 class MockWifiLegacyHal : public WifiLegacyHal {
    public:
-    MockWifiLegacyHal();
+    MockWifiLegacyHal(
+        const std::weak_ptr<wifi_system::InterfaceTool> iface_tool);
     MOCK_METHOD0(initialize, wifi_error());
     MOCK_METHOD0(start, wifi_error());
     MOCK_METHOD2(stop, wifi_error(std::unique_lock<std::recursive_mutex>*,
diff --git a/wifi/1.3/default/tests/wifi_ap_iface_unit_tests.cpp b/wifi/1.3/default/tests/wifi_ap_iface_unit_tests.cpp
index 28e028b..680f534 100644
--- a/wifi/1.3/default/tests/wifi_ap_iface_unit_tests.cpp
+++ b/wifi/1.3/default/tests/wifi_ap_iface_unit_tests.cpp
@@ -22,6 +22,7 @@
 #undef NAN  // This is weird, NAN is defined in bionic/libc/include/math.h:38
 #include "wifi_ap_iface.h"
 
+#include "mock_interface_tool.h"
 #include "mock_wifi_feature_flags.h"
 #include "mock_wifi_iface_util.h"
 #include "mock_wifi_legacy_hal.h"
@@ -42,10 +43,12 @@
 
 class WifiApIfaceTest : public Test {
    protected:
+    std::shared_ptr<NiceMock<wifi_system::MockInterfaceTool>> iface_tool_{
+        new NiceMock<wifi_system::MockInterfaceTool>};
     std::shared_ptr<NiceMock<legacy_hal::MockWifiLegacyHal>> legacy_hal_{
-        new NiceMock<legacy_hal::MockWifiLegacyHal>};
+        new NiceMock<legacy_hal::MockWifiLegacyHal>(iface_tool_)};
     std::shared_ptr<NiceMock<iface_util::MockWifiIfaceUtil>> iface_util_{
-        new NiceMock<iface_util::MockWifiIfaceUtil>};
+        new NiceMock<iface_util::MockWifiIfaceUtil>(iface_tool_)};
     std::shared_ptr<NiceMock<feature_flags::MockWifiFeatureFlags>>
         feature_flags_{new NiceMock<feature_flags::MockWifiFeatureFlags>};
 };
diff --git a/wifi/1.3/default/tests/wifi_chip_unit_tests.cpp b/wifi/1.3/default/tests/wifi_chip_unit_tests.cpp
index 22359e9..d8ce278 100644
--- a/wifi/1.3/default/tests/wifi_chip_unit_tests.cpp
+++ b/wifi/1.3/default/tests/wifi_chip_unit_tests.cpp
@@ -22,6 +22,7 @@
 #undef NAN  // This is weird, NAN is defined in bionic/libc/include/math.h:38
 #include "wifi_chip.h"
 
+#include "mock_interface_tool.h"
 #include "mock_wifi_feature_flags.h"
 #include "mock_wifi_iface_util.h"
 #include "mock_wifi_legacy_hal.h"
@@ -263,12 +264,14 @@
 
     sp<WifiChip> chip_;
     ChipId chip_id_ = kFakeChipId;
+    std::shared_ptr<NiceMock<wifi_system::MockInterfaceTool>> iface_tool_{
+        new NiceMock<wifi_system::MockInterfaceTool>};
     std::shared_ptr<NiceMock<legacy_hal::MockWifiLegacyHal>> legacy_hal_{
-        new NiceMock<legacy_hal::MockWifiLegacyHal>};
+        new NiceMock<legacy_hal::MockWifiLegacyHal>(iface_tool_)};
     std::shared_ptr<NiceMock<mode_controller::MockWifiModeController>>
         mode_controller_{new NiceMock<mode_controller::MockWifiModeController>};
     std::shared_ptr<NiceMock<iface_util::MockWifiIfaceUtil>> iface_util_{
-        new NiceMock<iface_util::MockWifiIfaceUtil>};
+        new NiceMock<iface_util::MockWifiIfaceUtil>(iface_tool_)};
     std::shared_ptr<NiceMock<feature_flags::MockWifiFeatureFlags>>
         feature_flags_{new NiceMock<feature_flags::MockWifiFeatureFlags>};
 
diff --git a/wifi/1.3/default/tests/wifi_iface_util_unit_tests.cpp b/wifi/1.3/default/tests/wifi_iface_util_unit_tests.cpp
index e5758fa..28d23ff 100644
--- a/wifi/1.3/default/tests/wifi_iface_util_unit_tests.cpp
+++ b/wifi/1.3/default/tests/wifi_iface_util_unit_tests.cpp
@@ -21,10 +21,15 @@
 #undef NAN
 #include "wifi_iface_util.h"
 
+#include "mock_interface_tool.h"
+
+using testing::NiceMock;
 using testing::Test;
 
 namespace {
 constexpr uint8_t kValidUnicastLocallyAssignedMacAddressMask = 0x02;
+constexpr uint8_t kMacAddress[] = {0x02, 0x12, 0x45, 0x56, 0xab, 0xcc};
+constexpr char kIfaceName[] = "test-wlan0";
 
 bool isValidUnicastLocallyAssignedMacAddress(
     const std::array<uint8_t, 6>& mac_address) {
@@ -38,19 +43,52 @@
 namespace wifi {
 namespace V1_3 {
 namespace implementation {
+namespace iface_util {
 class WifiIfaceUtilTest : public Test {
    protected:
-    iface_util::WifiIfaceUtil iface_util_;
+    std::shared_ptr<NiceMock<wifi_system::MockInterfaceTool>> iface_tool_{
+        new NiceMock<wifi_system::MockInterfaceTool>};
+    WifiIfaceUtil* iface_util_ = new WifiIfaceUtil(iface_tool_);
 };
 
 TEST_F(WifiIfaceUtilTest, GetOrCreateRandomMacAddress) {
-    auto mac_address = iface_util_.getOrCreateRandomMacAddress();
+    auto mac_address = iface_util_->getOrCreateRandomMacAddress();
     ASSERT_TRUE(isValidUnicastLocallyAssignedMacAddress(mac_address));
 
     // All further calls should return the same MAC address.
-    ASSERT_EQ(mac_address, iface_util_.getOrCreateRandomMacAddress());
-    ASSERT_EQ(mac_address, iface_util_.getOrCreateRandomMacAddress());
+    ASSERT_EQ(mac_address, iface_util_->getOrCreateRandomMacAddress());
+    ASSERT_EQ(mac_address, iface_util_->getOrCreateRandomMacAddress());
 }
+
+TEST_F(WifiIfaceUtilTest, IfaceEventHandlers_SetMacAddress) {
+    std::array<uint8_t, 6> mac_address = {};
+    std::copy(std::begin(kMacAddress), std::end(kMacAddress),
+              std::begin(mac_address));
+    EXPECT_CALL(*iface_tool_, SetMacAddress(testing::_, testing::_))
+        .WillRepeatedly(testing::Return(true));
+    EXPECT_CALL(*iface_tool_, SetUpState(testing::_, testing::_))
+        .WillRepeatedly(testing::Return(true));
+
+    // Register for iface state toggle events.
+    bool callback_invoked = false;
+    iface_util::IfaceEventHandlers event_handlers = {};
+    event_handlers.on_state_toggle_off_on =
+        [&callback_invoked](const std::string& /* iface_name */) {
+            callback_invoked = true;
+        };
+    iface_util_->registerIfaceEventHandlers(kIfaceName, event_handlers);
+    // Invoke setMacAddress and ensure that the cb is invoked.
+    ASSERT_TRUE(iface_util_->setMacAddress(kIfaceName, mac_address));
+    ASSERT_TRUE(callback_invoked);
+
+    // Unregister for iface state toggle events.
+    callback_invoked = false;
+    iface_util_->unregisterIfaceEventHandlers(kIfaceName);
+    // Invoke setMacAddress and ensure that the cb is not invoked.
+    ASSERT_TRUE(iface_util_->setMacAddress(kIfaceName, mac_address));
+    ASSERT_FALSE(callback_invoked);
+}
+}  // namespace iface_util
 }  // namespace implementation
 }  // namespace V1_3
 }  // namespace wifi
diff --git a/wifi/1.3/default/tests/wifi_nan_iface_unit_tests.cpp b/wifi/1.3/default/tests/wifi_nan_iface_unit_tests.cpp
new file mode 100644
index 0000000..eb6c610
--- /dev/null
+++ b/wifi/1.3/default/tests/wifi_nan_iface_unit_tests.cpp
@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2019, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <android-base/logging.h>
+#include <android-base/macros.h>
+#include <cutils/properties.h>
+#include <gmock/gmock.h>
+
+#undef NAN  // This is weird, NAN is defined in bionic/libc/include/math.h:38
+#include "wifi_nan_iface.h"
+
+#include "mock_interface_tool.h"
+#include "mock_wifi_feature_flags.h"
+#include "mock_wifi_iface_util.h"
+#include "mock_wifi_legacy_hal.h"
+
+using testing::NiceMock;
+using testing::Return;
+using testing::Test;
+
+namespace {
+constexpr char kIfaceName[] = "mockWlan0";
+}  // namespace
+
+namespace android {
+namespace hardware {
+namespace wifi {
+namespace V1_3 {
+namespace implementation {
+
+bool CaptureIfaceEventHandlers(
+    const std::string& /* iface_name*/,
+    iface_util::IfaceEventHandlers in_iface_event_handlers,
+    iface_util::IfaceEventHandlers* out_iface_event_handlers) {
+    *out_iface_event_handlers = in_iface_event_handlers;
+    return true;
+}
+
+class MockNanIfaceEventCallback : public IWifiNanIfaceEventCallback {
+   public:
+    MockNanIfaceEventCallback() = default;
+
+    MOCK_METHOD3(notifyCapabilitiesResponse,
+                 Return<void>(uint16_t, const WifiNanStatus&,
+                              const NanCapabilities&));
+    MOCK_METHOD2(notifyEnableResponse,
+                 Return<void>(uint16_t, const WifiNanStatus&));
+    MOCK_METHOD2(notifyConfigResponse,
+                 Return<void>(uint16_t, const WifiNanStatus&));
+    MOCK_METHOD2(notifyDisableResponse,
+                 Return<void>(uint16_t, const WifiNanStatus&));
+    MOCK_METHOD3(notifyStartPublishResponse,
+                 Return<void>(uint16_t, const WifiNanStatus&, uint8_t));
+    MOCK_METHOD2(notifyStopPublishResponse,
+                 Return<void>(uint16_t, const WifiNanStatus&));
+    MOCK_METHOD3(notifyStartSubscribeResponse,
+                 Return<void>(uint16_t, const WifiNanStatus&, uint8_t));
+    MOCK_METHOD2(notifyStopSubscribeResponse,
+                 Return<void>(uint16_t, const WifiNanStatus&));
+    MOCK_METHOD2(notifyTransmitFollowupResponse,
+                 Return<void>(uint16_t, const WifiNanStatus&));
+    MOCK_METHOD2(notifyCreateDataInterfaceResponse,
+                 Return<void>(uint16_t, const WifiNanStatus&));
+    MOCK_METHOD2(notifyDeleteDataInterfaceResponse,
+                 Return<void>(uint16_t, const WifiNanStatus&));
+    MOCK_METHOD3(notifyInitiateDataPathResponse,
+                 Return<void>(uint16_t, const WifiNanStatus&, uint32_t));
+    MOCK_METHOD2(notifyRespondToDataPathIndicationResponse,
+                 Return<void>(uint16_t, const WifiNanStatus&));
+    MOCK_METHOD2(notifyTerminateDataPathResponse,
+                 Return<void>(uint16_t, const WifiNanStatus&));
+    MOCK_METHOD1(eventClusterEvent, Return<void>(const NanClusterEventInd&));
+    MOCK_METHOD1(eventDisabled, Return<void>(const WifiNanStatus&));
+    MOCK_METHOD2(eventPublishTerminated,
+                 Return<void>(uint8_t, const WifiNanStatus&));
+    MOCK_METHOD2(eventSubscribeTerminated,
+                 Return<void>(uint8_t, const WifiNanStatus&));
+    MOCK_METHOD1(eventMatch, Return<void>(const NanMatchInd&));
+    MOCK_METHOD2(eventMatchExpired, Return<void>(uint8_t, uint32_t));
+    MOCK_METHOD1(eventFollowupReceived,
+                 Return<void>(const NanFollowupReceivedInd&));
+    MOCK_METHOD2(eventTransmitFollowup,
+                 Return<void>(uint16_t, const WifiNanStatus&));
+    MOCK_METHOD1(eventDataPathRequest,
+                 Return<void>(const NanDataPathRequestInd&));
+    MOCK_METHOD1(eventDataPathConfirm,
+                 Return<void>(const NanDataPathConfirmInd&));
+    MOCK_METHOD1(eventDataPathTerminated, Return<void>(uint32_t));
+};
+
+class WifiNanIfaceTest : public Test {
+   protected:
+    std::shared_ptr<NiceMock<wifi_system::MockInterfaceTool>> iface_tool_{
+        new NiceMock<wifi_system::MockInterfaceTool>};
+    std::shared_ptr<NiceMock<legacy_hal::MockWifiLegacyHal>> legacy_hal_{
+        new NiceMock<legacy_hal::MockWifiLegacyHal>(iface_tool_)};
+    std::shared_ptr<NiceMock<iface_util::MockWifiIfaceUtil>> iface_util_{
+        new NiceMock<iface_util::MockWifiIfaceUtil>(iface_tool_)};
+};
+
+TEST_F(WifiNanIfaceTest, IfacEventHandlers_OnStateToggleOffOn) {
+    iface_util::IfaceEventHandlers captured_iface_event_handlers = {};
+    EXPECT_CALL(*legacy_hal_,
+                nanRegisterCallbackHandlers(testing::_, testing::_))
+        .WillOnce(testing::Return(legacy_hal::WIFI_SUCCESS));
+    EXPECT_CALL(*iface_util_,
+                registerIfaceEventHandlers(testing::_, testing::_))
+        .WillOnce(testing::Invoke(
+            bind(CaptureIfaceEventHandlers, std::placeholders::_1,
+                 std::placeholders::_2, &captured_iface_event_handlers)));
+    sp<WifiNanIface> nan_iface =
+        new WifiNanIface(kIfaceName, legacy_hal_, iface_util_);
+
+    // Register a mock nan event callback.
+    sp<NiceMock<MockNanIfaceEventCallback>> mock_event_callback{
+        new NiceMock<MockNanIfaceEventCallback>};
+    nan_iface->registerEventCallback(
+        mock_event_callback, [](const WifiStatus& status) {
+            ASSERT_EQ(WifiStatusCode::SUCCESS, status.code);
+        });
+    // Ensure that the eventDisabled() function in mock callback will be
+    // invoked.
+    WifiNanStatus expected_nan_status = {
+        NanStatusType::UNSUPPORTED_CONCURRENCY_NAN_DISABLED, ""};
+    EXPECT_CALL(*mock_event_callback, eventDisabled(expected_nan_status))
+        .Times(1);
+
+    // Trigger the iface state toggle callback.
+    captured_iface_event_handlers.on_state_toggle_off_on(kIfaceName);
+}
+}  // namespace implementation
+}  // namespace V1_3
+}  // namespace wifi
+}  // namespace hardware
+}  // namespace android
diff --git a/wifi/1.3/default/wifi.cpp b/wifi/1.3/default/wifi.cpp
index 1f64085..2f21819 100644
--- a/wifi/1.3/default/wifi.cpp
+++ b/wifi/1.3/default/wifi.cpp
@@ -34,11 +34,13 @@
 using hidl_return_util::validateAndCallWithLock;
 
 Wifi::Wifi(
+    const std::shared_ptr<wifi_system::InterfaceTool> iface_tool,
     const std::shared_ptr<legacy_hal::WifiLegacyHal> legacy_hal,
     const std::shared_ptr<mode_controller::WifiModeController> mode_controller,
     const std::shared_ptr<iface_util::WifiIfaceUtil> iface_util,
     const std::shared_ptr<feature_flags::WifiFeatureFlags> feature_flags)
-    : legacy_hal_(legacy_hal),
+    : iface_tool_(iface_tool),
+      legacy_hal_(legacy_hal),
       mode_controller_(mode_controller),
       iface_util_(iface_util),
       feature_flags_(feature_flags),
diff --git a/wifi/1.3/default/wifi.h b/wifi/1.3/default/wifi.h
index c4ab773..1c2a154 100644
--- a/wifi/1.3/default/wifi.h
+++ b/wifi/1.3/default/wifi.h
@@ -40,7 +40,8 @@
  */
 class Wifi : public V1_3::IWifi {
    public:
-    Wifi(const std::shared_ptr<legacy_hal::WifiLegacyHal> legacy_hal,
+    Wifi(const std::shared_ptr<wifi_system::InterfaceTool> iface_tool,
+         const std::shared_ptr<legacy_hal::WifiLegacyHal> legacy_hal,
          const std::shared_ptr<mode_controller::WifiModeController>
              mode_controller,
          const std::shared_ptr<iface_util::WifiIfaceUtil> iface_util,
@@ -77,6 +78,7 @@
 
     // Instance is created in this root level |IWifi| HIDL interface object
     // and shared with all the child HIDL interface objects.
+    std::shared_ptr<wifi_system::InterfaceTool> iface_tool_;
     std::shared_ptr<legacy_hal::WifiLegacyHal> legacy_hal_;
     std::shared_ptr<mode_controller::WifiModeController> mode_controller_;
     std::shared_ptr<iface_util::WifiIfaceUtil> iface_util_;
diff --git a/wifi/1.3/default/wifi_iface_util.cpp b/wifi/1.3/default/wifi_iface_util.cpp
index 7042af0..34bc02d 100644
--- a/wifi/1.3/default/wifi_iface_util.cpp
+++ b/wifi/1.3/default/wifi_iface_util.cpp
@@ -39,25 +39,28 @@
 namespace implementation {
 namespace iface_util {
 
-WifiIfaceUtil::WifiIfaceUtil()
-    : random_mac_address_(nullptr), event_handlers_map_() {}
+WifiIfaceUtil::WifiIfaceUtil(
+    const std::weak_ptr<wifi_system::InterfaceTool> iface_tool)
+    : iface_tool_(iface_tool),
+      random_mac_address_(nullptr),
+      event_handlers_map_() {}
 
 std::array<uint8_t, 6> WifiIfaceUtil::getFactoryMacAddress(
     const std::string& iface_name) {
-    return iface_tool_.GetFactoryMacAddress(iface_name.c_str());
+    return iface_tool_.lock()->GetFactoryMacAddress(iface_name.c_str());
 }
 
 bool WifiIfaceUtil::setMacAddress(const std::string& iface_name,
                                   const std::array<uint8_t, 6>& mac) {
-    if (!iface_tool_.SetUpState(iface_name.c_str(), false)) {
+    if (!iface_tool_.lock()->SetUpState(iface_name.c_str(), false)) {
         LOG(ERROR) << "SetUpState(false) failed.";
         return false;
     }
-    if (!iface_tool_.SetMacAddress(iface_name.c_str(), mac)) {
+    if (!iface_tool_.lock()->SetMacAddress(iface_name.c_str(), mac)) {
         LOG(ERROR) << "SetMacAddress failed.";
         return false;
     }
-    if (!iface_tool_.SetUpState(iface_name.c_str(), true)) {
+    if (!iface_tool_.lock()->SetUpState(iface_name.c_str(), true)) {
         LOG(ERROR) << "SetUpState(true) failed.";
         return false;
     }
diff --git a/wifi/1.3/default/wifi_iface_util.h b/wifi/1.3/default/wifi_iface_util.h
index 325fbe8..98073e0 100644
--- a/wifi/1.3/default/wifi_iface_util.h
+++ b/wifi/1.3/default/wifi_iface_util.h
@@ -40,7 +40,7 @@
  */
 class WifiIfaceUtil {
    public:
-    WifiIfaceUtil();
+    WifiIfaceUtil(const std::weak_ptr<wifi_system::InterfaceTool> iface_tool);
     virtual ~WifiIfaceUtil() = default;
 
     virtual std::array<uint8_t, 6> getFactoryMacAddress(
@@ -60,7 +60,7 @@
    private:
     std::array<uint8_t, 6> createRandomMacAddress();
 
-    wifi_system::InterfaceTool iface_tool_;
+    std::weak_ptr<wifi_system::InterfaceTool> iface_tool_;
     std::unique_ptr<std::array<uint8_t, 6>> random_mac_address_;
     std::map<std::string, IfaceEventHandlers> event_handlers_map_;
 };
diff --git a/wifi/1.3/default/wifi_legacy_hal.cpp b/wifi/1.3/default/wifi_legacy_hal.cpp
index 7f9b635..485bd16 100644
--- a/wifi/1.3/default/wifi_legacy_hal.cpp
+++ b/wifi/1.3/default/wifi_legacy_hal.cpp
@@ -333,10 +333,12 @@
 }
 // End of the free-standing "C" style callbacks.
 
-WifiLegacyHal::WifiLegacyHal()
+WifiLegacyHal::WifiLegacyHal(
+    const std::weak_ptr<wifi_system::InterfaceTool> iface_tool)
     : global_handle_(nullptr),
       awaiting_event_loop_termination_(false),
-      is_started_(false) {}
+      is_started_(false),
+      iface_tool_(iface_tool) {}
 
 wifi_error WifiLegacyHal::initialize() {
     LOG(DEBUG) << "Initialize legacy HAL";
@@ -371,7 +373,7 @@
     property_set(kDriverPropName, "ok");
 
     LOG(DEBUG) << "Starting legacy HAL";
-    if (!iface_tool_.SetWifiUpState(true)) {
+    if (!iface_tool_.lock()->SetWifiUpState(true)) {
         LOG(ERROR) << "Failed to set WiFi interface up";
         return WIFI_ERROR_UNKNOWN;
     }
@@ -407,7 +409,7 @@
         // Invalidate all the internal pointers now that the HAL is
         // stopped.
         invalidate();
-        iface_tool_.SetWifiUpState(false);
+        iface_tool_.lock()->SetWifiUpState(false);
         on_stop_complete_user_callback();
         is_started_ = false;
     };
diff --git a/wifi/1.3/default/wifi_legacy_hal.h b/wifi/1.3/default/wifi_legacy_hal.h
index a3ed460..9cfa172 100644
--- a/wifi/1.3/default/wifi_legacy_hal.h
+++ b/wifi/1.3/default/wifi_legacy_hal.h
@@ -170,7 +170,7 @@
  */
 class WifiLegacyHal {
    public:
-    WifiLegacyHal();
+    WifiLegacyHal(const std::weak_ptr<wifi_system::InterfaceTool> iface_tool);
     virtual ~WifiLegacyHal() = default;
 
     // Initialize the legacy HAL function table.
@@ -391,7 +391,7 @@
     std::condition_variable_any stop_wait_cv_;
     // Flag to indicate if the legacy HAL has been started.
     bool is_started_;
-    wifi_system::InterfaceTool iface_tool_;
+    std::weak_ptr<wifi_system::InterfaceTool> iface_tool_;
 };
 
 }  // namespace legacy_hal