wifi(implementation): Create 1.1 interface package

1. Move the implementation in 1.0/default to 1.1/default.
2. Move all of the implementation to
android::hardware::V1_1::implementation namespace.
3. All of the header files include the android::hardware::V1_0 namespace
so that it can access the types from 1.0 package. ("using namespace" is
against Google style guide though :().
The other option to prefix each 1.0 type with the namespace name.
For example: V1_0::WifiStatus.
4. Added the implementation of the new 1.1 method
IWifiChip.setTxPowerLimit().
4. The executable name and the .rc still has 1.0 name in it to avoid
changing all the device.mk files.

TODO: Hookup to the new legacy HAL API.

Bug: 62437848
Test: mmm -j128 hardware/interfaces/wifi/1.1/default/
Test: Device boots up and able to connect to wifi networks.
Test: New VTS tests passes
Change-Id: Ib36282939e70b064f246041a03d8870f5cb6410e
diff --git a/wifi/1.1/default/wifi_legacy_hal.cpp b/wifi/1.1/default/wifi_legacy_hal.cpp
new file mode 100644
index 0000000..c1e1cd3
--- /dev/null
+++ b/wifi/1.1/default/wifi_legacy_hal.cpp
@@ -0,0 +1,1322 @@
+/*
+ * Copyright (C) 2016 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 <array>
+
+#include <android-base/logging.h>
+#include <cutils/properties.h>
+
+#include "hidl_sync_util.h"
+#include "wifi_legacy_hal.h"
+#include "wifi_legacy_hal_stubs.h"
+
+namespace {
+// Constants ported over from the legacy HAL calling code
+// (com_android_server_wifi_WifiNative.cpp). This will all be thrown
+// away when this shim layer is replaced by the real vendor
+// implementation.
+static constexpr uint32_t kMaxVersionStringLength = 256;
+static constexpr uint32_t kMaxCachedGscanResults = 64;
+static constexpr uint32_t kMaxGscanFrequenciesForBand = 64;
+static constexpr uint32_t kLinkLayerStatsDataMpduSizeThreshold = 128;
+static constexpr uint32_t kMaxWakeReasonStatsArraySize = 32;
+static constexpr uint32_t kMaxRingBuffers = 10;
+
+// Helper function to create a non-const char* for legacy Hal API's.
+std::vector<char> makeCharVec(const std::string& str) {
+  std::vector<char> vec(str.size() + 1);
+  vec.assign(str.begin(), str.end());
+  vec.push_back('\0');
+  return vec;
+}
+}  // namespace
+
+namespace android {
+namespace hardware {
+namespace wifi {
+namespace V1_1 {
+namespace implementation {
+namespace legacy_hal {
+// Legacy HAL functions accept "C" style function pointers, so use global
+// functions to pass to the legacy HAL function and store the corresponding
+// std::function methods to be invoked.
+// Callback to be invoked once |stop| is complete.
+std::function<void(wifi_handle handle)> on_stop_complete_internal_callback;
+void onAsyncStopComplete(wifi_handle handle) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_stop_complete_internal_callback) {
+    on_stop_complete_internal_callback(handle);
+    // Invalidate this callback since we don't want this firing again.
+    on_stop_complete_internal_callback = nullptr;
+  }
+}
+
+// Callback to be invoked for driver dump.
+std::function<void(char*, int)> on_driver_memory_dump_internal_callback;
+void onSyncDriverMemoryDump(char* buffer, int buffer_size) {
+  if (on_driver_memory_dump_internal_callback) {
+    on_driver_memory_dump_internal_callback(buffer, buffer_size);
+  }
+}
+
+// Callback to be invoked for firmware dump.
+std::function<void(char*, int)> on_firmware_memory_dump_internal_callback;
+void onSyncFirmwareMemoryDump(char* buffer, int buffer_size) {
+  if (on_firmware_memory_dump_internal_callback) {
+    on_firmware_memory_dump_internal_callback(buffer, buffer_size);
+  }
+}
+
+// Callback to be invoked for Gscan events.
+std::function<void(wifi_request_id, wifi_scan_event)>
+    on_gscan_event_internal_callback;
+void onAsyncGscanEvent(wifi_request_id id, wifi_scan_event event) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_gscan_event_internal_callback) {
+    on_gscan_event_internal_callback(id, event);
+  }
+}
+
+// Callback to be invoked for Gscan full results.
+std::function<void(wifi_request_id, wifi_scan_result*, uint32_t)>
+    on_gscan_full_result_internal_callback;
+void onAsyncGscanFullResult(wifi_request_id id,
+                            wifi_scan_result* result,
+                            uint32_t buckets_scanned) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_gscan_full_result_internal_callback) {
+    on_gscan_full_result_internal_callback(id, result, buckets_scanned);
+  }
+}
+
+// Callback to be invoked for link layer stats results.
+std::function<void((wifi_request_id, wifi_iface_stat*, int, wifi_radio_stat*))>
+    on_link_layer_stats_result_internal_callback;
+void onSyncLinkLayerStatsResult(wifi_request_id id,
+                                wifi_iface_stat* iface_stat,
+                                int num_radios,
+                                wifi_radio_stat* radio_stat) {
+  if (on_link_layer_stats_result_internal_callback) {
+    on_link_layer_stats_result_internal_callback(
+        id, iface_stat, num_radios, radio_stat);
+  }
+}
+
+// Callback to be invoked for rssi threshold breach.
+std::function<void((wifi_request_id, uint8_t*, int8_t))>
+    on_rssi_threshold_breached_internal_callback;
+void onAsyncRssiThresholdBreached(wifi_request_id id,
+                                  uint8_t* bssid,
+                                  int8_t rssi) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_rssi_threshold_breached_internal_callback) {
+    on_rssi_threshold_breached_internal_callback(id, bssid, rssi);
+  }
+}
+
+// Callback to be invoked for ring buffer data indication.
+std::function<void(char*, char*, int, wifi_ring_buffer_status*)>
+    on_ring_buffer_data_internal_callback;
+void onAsyncRingBufferData(char* ring_name,
+                           char* buffer,
+                           int buffer_size,
+                           wifi_ring_buffer_status* status) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_ring_buffer_data_internal_callback) {
+    on_ring_buffer_data_internal_callback(
+        ring_name, buffer, buffer_size, status);
+  }
+}
+
+// Callback to be invoked for error alert indication.
+std::function<void(wifi_request_id, char*, int, int)>
+    on_error_alert_internal_callback;
+void onAsyncErrorAlert(wifi_request_id id,
+                       char* buffer,
+                       int buffer_size,
+                       int err_code) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_error_alert_internal_callback) {
+    on_error_alert_internal_callback(id, buffer, buffer_size, err_code);
+  }
+}
+
+// Callback to be invoked for rtt results results.
+std::function<void(
+    wifi_request_id, unsigned num_results, wifi_rtt_result* rtt_results[])>
+    on_rtt_results_internal_callback;
+void onAsyncRttResults(wifi_request_id id,
+                       unsigned num_results,
+                       wifi_rtt_result* rtt_results[]) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_rtt_results_internal_callback) {
+    on_rtt_results_internal_callback(id, num_results, rtt_results);
+    on_rtt_results_internal_callback = nullptr;
+  }
+}
+
+// Callbacks for the various NAN operations.
+// NOTE: These have very little conversions to perform before invoking the user
+// callbacks.
+// So, handle all of them here directly to avoid adding an unnecessary layer.
+std::function<void(transaction_id, const NanResponseMsg&)>
+    on_nan_notify_response_user_callback;
+void onAysncNanNotifyResponse(transaction_id id, NanResponseMsg* msg) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_nan_notify_response_user_callback && msg) {
+    on_nan_notify_response_user_callback(id, *msg);
+  }
+}
+
+std::function<void(const NanPublishRepliedInd&)>
+    on_nan_event_publish_replied_user_callback;
+void onAysncNanEventPublishReplied(NanPublishRepliedInd* /* event */) {
+  LOG(ERROR) << "onAysncNanEventPublishReplied triggered";
+}
+
+std::function<void(const NanPublishTerminatedInd&)>
+    on_nan_event_publish_terminated_user_callback;
+void onAysncNanEventPublishTerminated(NanPublishTerminatedInd* event) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_nan_event_publish_terminated_user_callback && event) {
+    on_nan_event_publish_terminated_user_callback(*event);
+  }
+}
+
+std::function<void(const NanMatchInd&)> on_nan_event_match_user_callback;
+void onAysncNanEventMatch(NanMatchInd* event) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_nan_event_match_user_callback && event) {
+    on_nan_event_match_user_callback(*event);
+  }
+}
+
+std::function<void(const NanMatchExpiredInd&)>
+    on_nan_event_match_expired_user_callback;
+void onAysncNanEventMatchExpired(NanMatchExpiredInd* event) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_nan_event_match_expired_user_callback && event) {
+    on_nan_event_match_expired_user_callback(*event);
+  }
+}
+
+std::function<void(const NanSubscribeTerminatedInd&)>
+    on_nan_event_subscribe_terminated_user_callback;
+void onAysncNanEventSubscribeTerminated(NanSubscribeTerminatedInd* event) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_nan_event_subscribe_terminated_user_callback && event) {
+    on_nan_event_subscribe_terminated_user_callback(*event);
+  }
+}
+
+std::function<void(const NanFollowupInd&)> on_nan_event_followup_user_callback;
+void onAysncNanEventFollowup(NanFollowupInd* event) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_nan_event_followup_user_callback && event) {
+    on_nan_event_followup_user_callback(*event);
+  }
+}
+
+std::function<void(const NanDiscEngEventInd&)>
+    on_nan_event_disc_eng_event_user_callback;
+void onAysncNanEventDiscEngEvent(NanDiscEngEventInd* event) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_nan_event_disc_eng_event_user_callback && event) {
+    on_nan_event_disc_eng_event_user_callback(*event);
+  }
+}
+
+std::function<void(const NanDisabledInd&)> on_nan_event_disabled_user_callback;
+void onAysncNanEventDisabled(NanDisabledInd* event) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_nan_event_disabled_user_callback && event) {
+    on_nan_event_disabled_user_callback(*event);
+  }
+}
+
+std::function<void(const NanTCAInd&)> on_nan_event_tca_user_callback;
+void onAysncNanEventTca(NanTCAInd* event) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_nan_event_tca_user_callback && event) {
+    on_nan_event_tca_user_callback(*event);
+  }
+}
+
+std::function<void(const NanBeaconSdfPayloadInd&)>
+    on_nan_event_beacon_sdf_payload_user_callback;
+void onAysncNanEventBeaconSdfPayload(NanBeaconSdfPayloadInd* event) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_nan_event_beacon_sdf_payload_user_callback && event) {
+    on_nan_event_beacon_sdf_payload_user_callback(*event);
+  }
+}
+
+std::function<void(const NanDataPathRequestInd&)>
+    on_nan_event_data_path_request_user_callback;
+void onAysncNanEventDataPathRequest(NanDataPathRequestInd* event) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_nan_event_data_path_request_user_callback && event) {
+    on_nan_event_data_path_request_user_callback(*event);
+  }
+}
+std::function<void(const NanDataPathConfirmInd&)>
+    on_nan_event_data_path_confirm_user_callback;
+void onAysncNanEventDataPathConfirm(NanDataPathConfirmInd* event) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_nan_event_data_path_confirm_user_callback && event) {
+    on_nan_event_data_path_confirm_user_callback(*event);
+  }
+}
+
+std::function<void(const NanDataPathEndInd&)>
+    on_nan_event_data_path_end_user_callback;
+void onAysncNanEventDataPathEnd(NanDataPathEndInd* event) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_nan_event_data_path_end_user_callback && event) {
+    on_nan_event_data_path_end_user_callback(*event);
+  }
+}
+
+std::function<void(const NanTransmitFollowupInd&)>
+    on_nan_event_transmit_follow_up_user_callback;
+void onAysncNanEventTransmitFollowUp(NanTransmitFollowupInd* event) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_nan_event_transmit_follow_up_user_callback && event) {
+    on_nan_event_transmit_follow_up_user_callback(*event);
+  }
+}
+
+std::function<void(const NanRangeRequestInd&)>
+    on_nan_event_range_request_user_callback;
+void onAysncNanEventRangeRequest(NanRangeRequestInd* event) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_nan_event_range_request_user_callback && event) {
+    on_nan_event_range_request_user_callback(*event);
+  }
+}
+
+std::function<void(const NanRangeReportInd&)>
+    on_nan_event_range_report_user_callback;
+void onAysncNanEventRangeReport(NanRangeReportInd* event) {
+  const auto lock = hidl_sync_util::acquireGlobalLock();
+  if (on_nan_event_range_report_user_callback && event) {
+    on_nan_event_range_report_user_callback(*event);
+  }
+}
+// End of the free-standing "C" style callbacks.
+
+WifiLegacyHal::WifiLegacyHal()
+    : global_handle_(nullptr),
+      wlan_interface_handle_(nullptr),
+      awaiting_event_loop_termination_(false),
+      is_started_(false) {}
+
+wifi_error WifiLegacyHal::initialize() {
+  LOG(DEBUG) << "Initialize legacy HAL";
+  // 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.
+  if (!initHalFuncTableWithStubs(&global_func_table_)) {
+    LOG(ERROR) << "Failed to initialize legacy hal function table with stubs";
+    return WIFI_ERROR_UNKNOWN;
+  }
+  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 status;
+}
+
+wifi_error WifiLegacyHal::start() {
+  // Ensure that we're starting in a good state.
+  CHECK(global_func_table_.wifi_initialize && !global_handle_ &&
+        !wlan_interface_handle_ && !awaiting_event_loop_termination_);
+  if (is_started_) {
+    LOG(DEBUG) << "Legacy HAL already started";
+    return WIFI_SUCCESS;
+  }
+  LOG(DEBUG) << "Starting legacy HAL";
+  if (!iface_tool_.SetWifiUpState(true)) {
+    LOG(ERROR) << "Failed to set WiFi interface up";
+    return WIFI_ERROR_UNKNOWN;
+  }
+  wifi_error status = global_func_table_.wifi_initialize(&global_handle_);
+  if (status != WIFI_SUCCESS || !global_handle_) {
+    LOG(ERROR) << "Failed to retrieve global handle";
+    return status;
+  }
+  std::thread(&WifiLegacyHal::runEventLoop, this).detach();
+  status = retrieveWlanInterfaceHandle();
+  if (status != WIFI_SUCCESS || !wlan_interface_handle_) {
+    LOG(ERROR) << "Failed to retrieve wlan interface handle";
+    return status;
+  }
+  LOG(DEBUG) << "Legacy HAL start complete";
+  is_started_ = true;
+  return WIFI_SUCCESS;
+}
+
+wifi_error WifiLegacyHal::stop(
+    const std::function<void()>& on_stop_complete_user_callback) {
+  if (!is_started_) {
+    LOG(DEBUG) << "Legacy HAL already stopped";
+    on_stop_complete_user_callback();
+    return WIFI_SUCCESS;
+  }
+  LOG(DEBUG) << "Stopping legacy HAL";
+  on_stop_complete_internal_callback = [on_stop_complete_user_callback,
+                                        this](wifi_handle handle) {
+    CHECK_EQ(global_handle_, handle) << "Handle mismatch";
+    // Invalidate all the internal pointers now that the HAL is
+    // stopped.
+    invalidate();
+    iface_tool_.SetWifiUpState(false);
+    on_stop_complete_user_callback();
+  };
+  awaiting_event_loop_termination_ = true;
+  global_func_table_.wifi_cleanup(global_handle_, onAsyncStopComplete);
+  LOG(DEBUG) << "Legacy HAL stop complete";
+  is_started_ = false;
+  return WIFI_SUCCESS;
+}
+
+std::string WifiLegacyHal::getApIfaceName() {
+  // Fake name. This interface does not exist in legacy HAL
+  // API's.
+  return "ap0";
+}
+
+std::string WifiLegacyHal::getNanIfaceName() {
+  // Fake name. This interface does not exist in legacy HAL
+  // API's.
+  return "nan0";
+}
+
+std::string WifiLegacyHal::getP2pIfaceName() {
+  std::array<char, PROPERTY_VALUE_MAX> buffer;
+  property_get("wifi.direct.interface", buffer.data(), "p2p0");
+  return buffer.data();
+}
+
+std::string WifiLegacyHal::getStaIfaceName() {
+  std::array<char, PROPERTY_VALUE_MAX> buffer;
+  property_get("wifi.interface", buffer.data(), "wlan0");
+  return buffer.data();
+}
+
+std::pair<wifi_error, std::string> WifiLegacyHal::getDriverVersion() {
+  std::array<char, kMaxVersionStringLength> buffer;
+  buffer.fill(0);
+  wifi_error status = global_func_table_.wifi_get_driver_version(
+      wlan_interface_handle_, buffer.data(), buffer.size());
+  return {status, buffer.data()};
+}
+
+std::pair<wifi_error, std::string> WifiLegacyHal::getFirmwareVersion() {
+  std::array<char, kMaxVersionStringLength> buffer;
+  buffer.fill(0);
+  wifi_error status = global_func_table_.wifi_get_firmware_version(
+      wlan_interface_handle_, buffer.data(), buffer.size());
+  return {status, buffer.data()};
+}
+
+std::pair<wifi_error, std::vector<uint8_t>>
+WifiLegacyHal::requestDriverMemoryDump() {
+  std::vector<uint8_t> driver_dump;
+  on_driver_memory_dump_internal_callback = [&driver_dump](char* buffer,
+                                                           int buffer_size) {
+    driver_dump.insert(driver_dump.end(),
+                       reinterpret_cast<uint8_t*>(buffer),
+                       reinterpret_cast<uint8_t*>(buffer) + buffer_size);
+  };
+  wifi_error status = global_func_table_.wifi_get_driver_memory_dump(
+      wlan_interface_handle_, {onSyncDriverMemoryDump});
+  on_driver_memory_dump_internal_callback = nullptr;
+  return {status, std::move(driver_dump)};
+}
+
+std::pair<wifi_error, std::vector<uint8_t>>
+WifiLegacyHal::requestFirmwareMemoryDump() {
+  std::vector<uint8_t> firmware_dump;
+  on_firmware_memory_dump_internal_callback = [&firmware_dump](
+      char* buffer, int buffer_size) {
+    firmware_dump.insert(firmware_dump.end(),
+                         reinterpret_cast<uint8_t*>(buffer),
+                         reinterpret_cast<uint8_t*>(buffer) + buffer_size);
+  };
+  wifi_error status = global_func_table_.wifi_get_firmware_memory_dump(
+      wlan_interface_handle_, {onSyncFirmwareMemoryDump});
+  on_firmware_memory_dump_internal_callback = nullptr;
+  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());
+}
+
+std::pair<wifi_error, wifi_gscan_capabilities>
+WifiLegacyHal::getGscanCapabilities() {
+  wifi_gscan_capabilities caps;
+  wifi_error status = global_func_table_.wifi_get_gscan_capabilities(
+      wlan_interface_handle_, &caps);
+  return {status, caps};
+}
+
+wifi_error WifiLegacyHal::startGscan(
+    wifi_request_id id,
+    const wifi_scan_cmd_params& params,
+    const std::function<void(wifi_request_id)>& on_failure_user_callback,
+    const on_gscan_results_callback& on_results_user_callback,
+    const on_gscan_full_result_callback& on_full_result_user_callback) {
+  // If there is already an ongoing background scan, reject new scan requests.
+  if (on_gscan_event_internal_callback ||
+      on_gscan_full_result_internal_callback) {
+    return WIFI_ERROR_NOT_AVAILABLE;
+  }
+
+  // This callback will be used to either trigger |on_results_user_callback| or
+  // |on_failure_user_callback|.
+  on_gscan_event_internal_callback =
+      [on_failure_user_callback, on_results_user_callback, this](
+          wifi_request_id id, wifi_scan_event event) {
+        switch (event) {
+          case WIFI_SCAN_RESULTS_AVAILABLE:
+          case WIFI_SCAN_THRESHOLD_NUM_SCANS:
+          case WIFI_SCAN_THRESHOLD_PERCENT: {
+            wifi_error status;
+            std::vector<wifi_cached_scan_results> cached_scan_results;
+            std::tie(status, cached_scan_results) = getGscanCachedResults();
+            if (status == WIFI_SUCCESS) {
+              on_results_user_callback(id, cached_scan_results);
+              return;
+            }
+          }
+          // Fall through if failed. Failure to retrieve cached scan results
+          // should trigger a background scan failure.
+          case WIFI_SCAN_FAILED:
+            on_failure_user_callback(id);
+            on_gscan_event_internal_callback = nullptr;
+            on_gscan_full_result_internal_callback = nullptr;
+            return;
+        }
+        LOG(FATAL) << "Unexpected gscan event received: " << event;
+      };
+
+  on_gscan_full_result_internal_callback = [on_full_result_user_callback](
+      wifi_request_id id, wifi_scan_result* result, uint32_t buckets_scanned) {
+    if (result) {
+      on_full_result_user_callback(id, result, buckets_scanned);
+    }
+  };
+
+  wifi_scan_result_handler handler = {onAsyncGscanFullResult,
+                                      onAsyncGscanEvent};
+  wifi_error status = global_func_table_.wifi_start_gscan(
+      id, wlan_interface_handle_, params, handler);
+  if (status != WIFI_SUCCESS) {
+    on_gscan_event_internal_callback = nullptr;
+    on_gscan_full_result_internal_callback = nullptr;
+  }
+  return status;
+}
+
+wifi_error WifiLegacyHal::stopGscan(wifi_request_id id) {
+  // If there is no an ongoing background scan, reject stop requests.
+  // TODO(b/32337212): This needs to be handled by the HIDL object because we
+  // need to return the NOT_STARTED error code.
+  if (!on_gscan_event_internal_callback &&
+      !on_gscan_full_result_internal_callback) {
+    return WIFI_ERROR_NOT_AVAILABLE;
+  }
+  wifi_error status =
+      global_func_table_.wifi_stop_gscan(id, wlan_interface_handle_);
+  // If the request Id is wrong, don't stop the ongoing background scan. Any
+  // other error should be treated as the end of background scan.
+  if (status != WIFI_ERROR_INVALID_REQUEST_ID) {
+    on_gscan_event_internal_callback = nullptr;
+    on_gscan_full_result_internal_callback = nullptr;
+  }
+  return status;
+}
+
+std::pair<wifi_error, std::vector<uint32_t>>
+WifiLegacyHal::getValidFrequenciesForBand(wifi_band band) {
+  static_assert(sizeof(uint32_t) >= sizeof(wifi_channel),
+                "Wifi Channel cannot be represented in output");
+  std::vector<uint32_t> freqs;
+  freqs.resize(kMaxGscanFrequenciesForBand);
+  int32_t num_freqs = 0;
+  wifi_error status = global_func_table_.wifi_get_valid_channels(
+      wlan_interface_handle_,
+      band,
+      freqs.size(),
+      reinterpret_cast<wifi_channel*>(freqs.data()),
+      &num_freqs);
+  CHECK(num_freqs >= 0 &&
+        static_cast<uint32_t>(num_freqs) <= kMaxGscanFrequenciesForBand);
+  freqs.resize(num_freqs);
+  return {status, std::move(freqs)};
+}
+
+wifi_error WifiLegacyHal::setDfsFlag(bool dfs_on) {
+  return global_func_table_.wifi_set_nodfs_flag(
+      wlan_interface_handle_, dfs_on ? 0 : 1);
+}
+
+wifi_error WifiLegacyHal::enableLinkLayerStats(bool debug) {
+  wifi_link_layer_params params;
+  params.mpdu_size_threshold = kLinkLayerStatsDataMpduSizeThreshold;
+  params.aggressive_statistics_gathering = debug;
+  return global_func_table_.wifi_set_link_stats(wlan_interface_handle_, params);
+}
+
+wifi_error WifiLegacyHal::disableLinkLayerStats() {
+  // TODO: Do we care about these responses?
+  uint32_t clear_mask_rsp;
+  uint8_t stop_rsp;
+  return global_func_table_.wifi_clear_link_stats(
+      wlan_interface_handle_, 0xFFFFFFFF, &clear_mask_rsp, 1, &stop_rsp);
+}
+
+std::pair<wifi_error, LinkLayerStats> WifiLegacyHal::getLinkLayerStats() {
+  LinkLayerStats link_stats{};
+  LinkLayerStats* link_stats_ptr = &link_stats;
+
+  on_link_layer_stats_result_internal_callback =
+      [&link_stats_ptr](wifi_request_id /* id */,
+                        wifi_iface_stat* iface_stats_ptr,
+                        int num_radios,
+                        wifi_radio_stat* radio_stats_ptr) {
+        if (iface_stats_ptr != nullptr) {
+          link_stats_ptr->iface = *iface_stats_ptr;
+          link_stats_ptr->iface.num_peers = 0;
+        } else {
+          LOG(ERROR) << "Invalid iface stats in link layer stats";
+        }
+        if (num_radios <= 0 || radio_stats_ptr == nullptr) {
+          LOG(ERROR) << "Invalid radio stats in link layer stats";
+          return;
+        }
+        for (int i = 0; i < num_radios; i++) {
+          LinkLayerRadioStats radio;
+          radio.stats = radio_stats_ptr[i];
+          // Copy over the tx level array to the separate vector.
+          if (radio_stats_ptr[i].num_tx_levels > 0 &&
+              radio_stats_ptr[i].tx_time_per_levels != nullptr) {
+            radio.tx_time_per_levels.assign(
+                radio_stats_ptr[i].tx_time_per_levels,
+                radio_stats_ptr[i].tx_time_per_levels +
+                    radio_stats_ptr[i].num_tx_levels);
+          }
+          radio.stats.num_tx_levels = 0;
+          radio.stats.tx_time_per_levels = nullptr;
+          link_stats_ptr->radios.push_back(radio);
+        }
+      };
+
+  wifi_error status = global_func_table_.wifi_get_link_stats(
+      0, wlan_interface_handle_, {onSyncLinkLayerStatsResult});
+  on_link_layer_stats_result_internal_callback = nullptr;
+  return {status, link_stats};
+}
+
+wifi_error WifiLegacyHal::startRssiMonitoring(
+    wifi_request_id id,
+    int8_t max_rssi,
+    int8_t min_rssi,
+    const on_rssi_threshold_breached_callback&
+        on_threshold_breached_user_callback) {
+  if (on_rssi_threshold_breached_internal_callback) {
+    return WIFI_ERROR_NOT_AVAILABLE;
+  }
+  on_rssi_threshold_breached_internal_callback =
+      [on_threshold_breached_user_callback](
+          wifi_request_id id, uint8_t* bssid_ptr, int8_t rssi) {
+        if (!bssid_ptr) {
+          return;
+        }
+        std::array<uint8_t, 6> bssid_arr;
+        // |bssid_ptr| pointer is assumed to have 6 bytes for the mac address.
+        std::copy(bssid_ptr, bssid_ptr + 6, std::begin(bssid_arr));
+        on_threshold_breached_user_callback(id, bssid_arr, rssi);
+      };
+  wifi_error status = global_func_table_.wifi_start_rssi_monitoring(
+      id,
+      wlan_interface_handle_,
+      max_rssi,
+      min_rssi,
+      {onAsyncRssiThresholdBreached});
+  if (status != WIFI_SUCCESS) {
+    on_rssi_threshold_breached_internal_callback = nullptr;
+  }
+  return status;
+}
+
+wifi_error WifiLegacyHal::stopRssiMonitoring(wifi_request_id id) {
+  if (!on_rssi_threshold_breached_internal_callback) {
+    return WIFI_ERROR_NOT_AVAILABLE;
+  }
+  wifi_error status =
+      global_func_table_.wifi_stop_rssi_monitoring(id, wlan_interface_handle_);
+  // If the request Id is wrong, don't stop the ongoing rssi monitoring. Any
+  // other error should be treated as the end of background scan.
+  if (status != WIFI_ERROR_INVALID_REQUEST_ID) {
+    on_rssi_threshold_breached_internal_callback = nullptr;
+  }
+  return status;
+}
+
+std::pair<wifi_error, wifi_roaming_capabilities>
+WifiLegacyHal::getRoamingCapabilities() {
+  wifi_roaming_capabilities caps;
+  wifi_error status = global_func_table_.wifi_get_roaming_capabilities(
+      wlan_interface_handle_, &caps);
+  return {status, caps};
+}
+
+wifi_error WifiLegacyHal::configureRoaming(const wifi_roaming_config& config) {
+  wifi_roaming_config config_internal = config;
+  return global_func_table_.wifi_configure_roaming(wlan_interface_handle_,
+                                                   &config_internal);
+}
+
+wifi_error WifiLegacyHal::enableFirmwareRoaming(fw_roaming_state_t state) {
+  return global_func_table_.wifi_enable_firmware_roaming(wlan_interface_handle_,
+                                                         state);
+}
+
+wifi_error WifiLegacyHal::configureNdOffload(bool enable) {
+  return global_func_table_.wifi_configure_nd_offload(wlan_interface_handle_,
+                                                      enable);
+}
+
+wifi_error WifiLegacyHal::startSendingOffloadedPacket(
+    uint32_t cmd_id,
+    const std::vector<uint8_t>& ip_packet_data,
+    const std::array<uint8_t, 6>& src_address,
+    const std::array<uint8_t, 6>& dst_address,
+    uint32_t period_in_ms) {
+  std::vector<uint8_t> ip_packet_data_internal(ip_packet_data);
+  std::vector<uint8_t> src_address_internal(
+      src_address.data(), src_address.data() + src_address.size());
+  std::vector<uint8_t> dst_address_internal(
+      dst_address.data(), dst_address.data() + dst_address.size());
+  return global_func_table_.wifi_start_sending_offloaded_packet(
+      cmd_id,
+      wlan_interface_handle_,
+      ip_packet_data_internal.data(),
+      ip_packet_data_internal.size(),
+      src_address_internal.data(),
+      dst_address_internal.data(),
+      period_in_ms);
+}
+
+wifi_error WifiLegacyHal::stopSendingOffloadedPacket(uint32_t cmd_id) {
+  return global_func_table_.wifi_stop_sending_offloaded_packet(
+      cmd_id, wlan_interface_handle_);
+}
+
+wifi_error WifiLegacyHal::setScanningMacOui(const std::array<uint8_t, 3>& oui) {
+  std::vector<uint8_t> oui_internal(oui.data(), oui.data() + oui.size());
+  return global_func_table_.wifi_set_scanning_mac_oui(wlan_interface_handle_,
+                                                      oui_internal.data());
+}
+
+std::pair<wifi_error, uint32_t> WifiLegacyHal::getLoggerSupportedFeatureSet() {
+  uint32_t supported_features;
+  wifi_error status = global_func_table_.wifi_get_logger_supported_feature_set(
+      wlan_interface_handle_, &supported_features);
+  return {status, supported_features};
+}
+
+wifi_error WifiLegacyHal::startPktFateMonitoring() {
+  return global_func_table_.wifi_start_pkt_fate_monitoring(
+      wlan_interface_handle_);
+}
+
+std::pair<wifi_error, std::vector<wifi_tx_report>>
+WifiLegacyHal::getTxPktFates() {
+  std::vector<wifi_tx_report> tx_pkt_fates;
+  tx_pkt_fates.resize(MAX_FATE_LOG_LEN);
+  size_t num_fates = 0;
+  wifi_error status =
+      global_func_table_.wifi_get_tx_pkt_fates(wlan_interface_handle_,
+                                               tx_pkt_fates.data(),
+                                               tx_pkt_fates.size(),
+                                               &num_fates);
+  CHECK(num_fates <= MAX_FATE_LOG_LEN);
+  tx_pkt_fates.resize(num_fates);
+  return {status, std::move(tx_pkt_fates)};
+}
+
+std::pair<wifi_error, std::vector<wifi_rx_report>>
+WifiLegacyHal::getRxPktFates() {
+  std::vector<wifi_rx_report> rx_pkt_fates;
+  rx_pkt_fates.resize(MAX_FATE_LOG_LEN);
+  size_t num_fates = 0;
+  wifi_error status =
+      global_func_table_.wifi_get_rx_pkt_fates(wlan_interface_handle_,
+                                               rx_pkt_fates.data(),
+                                               rx_pkt_fates.size(),
+                                               &num_fates);
+  CHECK(num_fates <= MAX_FATE_LOG_LEN);
+  rx_pkt_fates.resize(num_fates);
+  return {status, std::move(rx_pkt_fates)};
+}
+
+std::pair<wifi_error, WakeReasonStats> WifiLegacyHal::getWakeReasonStats() {
+  WakeReasonStats stats;
+  stats.cmd_event_wake_cnt.resize(kMaxWakeReasonStatsArraySize);
+  stats.driver_fw_local_wake_cnt.resize(kMaxWakeReasonStatsArraySize);
+
+  // This legacy struct needs separate memory to store the variable sized wake
+  // reason types.
+  stats.wake_reason_cnt.cmd_event_wake_cnt =
+      reinterpret_cast<int32_t*>(stats.cmd_event_wake_cnt.data());
+  stats.wake_reason_cnt.cmd_event_wake_cnt_sz = stats.cmd_event_wake_cnt.size();
+  stats.wake_reason_cnt.cmd_event_wake_cnt_used = 0;
+  stats.wake_reason_cnt.driver_fw_local_wake_cnt =
+      reinterpret_cast<int32_t*>(stats.driver_fw_local_wake_cnt.data());
+  stats.wake_reason_cnt.driver_fw_local_wake_cnt_sz =
+      stats.driver_fw_local_wake_cnt.size();
+  stats.wake_reason_cnt.driver_fw_local_wake_cnt_used = 0;
+
+  wifi_error status = global_func_table_.wifi_get_wake_reason_stats(
+      wlan_interface_handle_, &stats.wake_reason_cnt);
+
+  CHECK(stats.wake_reason_cnt.cmd_event_wake_cnt_used >= 0 &&
+        static_cast<uint32_t>(stats.wake_reason_cnt.cmd_event_wake_cnt_used) <=
+            kMaxWakeReasonStatsArraySize);
+  stats.cmd_event_wake_cnt.resize(
+      stats.wake_reason_cnt.cmd_event_wake_cnt_used);
+  stats.wake_reason_cnt.cmd_event_wake_cnt = nullptr;
+
+  CHECK(stats.wake_reason_cnt.driver_fw_local_wake_cnt_used >= 0 &&
+        static_cast<uint32_t>(
+            stats.wake_reason_cnt.driver_fw_local_wake_cnt_used) <=
+            kMaxWakeReasonStatsArraySize);
+  stats.driver_fw_local_wake_cnt.resize(
+      stats.wake_reason_cnt.driver_fw_local_wake_cnt_used);
+  stats.wake_reason_cnt.driver_fw_local_wake_cnt = nullptr;
+
+  return {status, stats};
+}
+
+wifi_error WifiLegacyHal::registerRingBufferCallbackHandler(
+    const on_ring_buffer_data_callback& on_user_data_callback) {
+  if (on_ring_buffer_data_internal_callback) {
+    return WIFI_ERROR_NOT_AVAILABLE;
+  }
+  on_ring_buffer_data_internal_callback = [on_user_data_callback](
+      char* ring_name,
+      char* buffer,
+      int buffer_size,
+      wifi_ring_buffer_status* status) {
+    if (status && buffer) {
+      std::vector<uint8_t> buffer_vector(
+          reinterpret_cast<uint8_t*>(buffer),
+          reinterpret_cast<uint8_t*>(buffer) + buffer_size);
+      on_user_data_callback(ring_name, buffer_vector, *status);
+    }
+  };
+  wifi_error status = global_func_table_.wifi_set_log_handler(
+      0, wlan_interface_handle_, {onAsyncRingBufferData});
+  if (status != WIFI_SUCCESS) {
+    on_ring_buffer_data_internal_callback = nullptr;
+  }
+  return status;
+}
+
+wifi_error WifiLegacyHal::deregisterRingBufferCallbackHandler() {
+  if (!on_ring_buffer_data_internal_callback) {
+    return WIFI_ERROR_NOT_AVAILABLE;
+  }
+  on_ring_buffer_data_internal_callback = nullptr;
+  return global_func_table_.wifi_reset_log_handler(0, wlan_interface_handle_);
+}
+
+std::pair<wifi_error, std::vector<wifi_ring_buffer_status>>
+WifiLegacyHal::getRingBuffersStatus() {
+  std::vector<wifi_ring_buffer_status> ring_buffers_status;
+  ring_buffers_status.resize(kMaxRingBuffers);
+  uint32_t num_rings = kMaxRingBuffers;
+  wifi_error status = global_func_table_.wifi_get_ring_buffers_status(
+      wlan_interface_handle_, &num_rings, ring_buffers_status.data());
+  CHECK(num_rings <= kMaxRingBuffers);
+  ring_buffers_status.resize(num_rings);
+  return {status, std::move(ring_buffers_status)};
+}
+
+wifi_error WifiLegacyHal::startRingBufferLogging(const std::string& ring_name,
+                                                 uint32_t verbose_level,
+                                                 uint32_t max_interval_sec,
+                                                 uint32_t min_data_size) {
+  return global_func_table_.wifi_start_logging(wlan_interface_handle_,
+                                               verbose_level,
+                                               0,
+                                               max_interval_sec,
+                                               min_data_size,
+                                               makeCharVec(ring_name).data());
+}
+
+wifi_error WifiLegacyHal::getRingBufferData(const std::string& ring_name) {
+  return global_func_table_.wifi_get_ring_data(wlan_interface_handle_,
+                                               makeCharVec(ring_name).data());
+}
+
+wifi_error WifiLegacyHal::registerErrorAlertCallbackHandler(
+    const on_error_alert_callback& on_user_alert_callback) {
+  if (on_error_alert_internal_callback) {
+    return WIFI_ERROR_NOT_AVAILABLE;
+  }
+  on_error_alert_internal_callback = [on_user_alert_callback](
+      wifi_request_id id, char* buffer, int buffer_size, int err_code) {
+    if (buffer) {
+      CHECK(id == 0);
+      on_user_alert_callback(
+          err_code,
+          std::vector<uint8_t>(
+              reinterpret_cast<uint8_t*>(buffer),
+              reinterpret_cast<uint8_t*>(buffer) + buffer_size));
+    }
+  };
+  wifi_error status = global_func_table_.wifi_set_alert_handler(
+      0, wlan_interface_handle_, {onAsyncErrorAlert});
+  if (status != WIFI_SUCCESS) {
+    on_error_alert_internal_callback = nullptr;
+  }
+  return status;
+}
+
+wifi_error WifiLegacyHal::deregisterErrorAlertCallbackHandler() {
+  if (!on_error_alert_internal_callback) {
+    return WIFI_ERROR_NOT_AVAILABLE;
+  }
+  on_error_alert_internal_callback = nullptr;
+  return global_func_table_.wifi_reset_alert_handler(0, wlan_interface_handle_);
+}
+
+wifi_error WifiLegacyHal::startRttRangeRequest(
+    wifi_request_id id,
+    const std::vector<wifi_rtt_config>& rtt_configs,
+    const on_rtt_results_callback& on_results_user_callback) {
+  if (on_rtt_results_internal_callback) {
+    return WIFI_ERROR_NOT_AVAILABLE;
+  }
+
+  on_rtt_results_internal_callback = [on_results_user_callback](
+      wifi_request_id id,
+      unsigned num_results,
+      wifi_rtt_result* rtt_results[]) {
+    if (num_results > 0 && !rtt_results) {
+      LOG(ERROR) << "Unexpected nullptr in RTT results";
+      return;
+    }
+    std::vector<const wifi_rtt_result*> rtt_results_vec;
+    std::copy_if(
+        rtt_results,
+        rtt_results + num_results,
+        back_inserter(rtt_results_vec),
+        [](wifi_rtt_result* rtt_result) { return rtt_result != nullptr; });
+    on_results_user_callback(id, rtt_results_vec);
+  };
+
+  std::vector<wifi_rtt_config> rtt_configs_internal(rtt_configs);
+  wifi_error status =
+      global_func_table_.wifi_rtt_range_request(id,
+                                                wlan_interface_handle_,
+                                                rtt_configs.size(),
+                                                rtt_configs_internal.data(),
+                                                {onAsyncRttResults});
+  if (status != WIFI_SUCCESS) {
+    on_rtt_results_internal_callback = nullptr;
+  }
+  return status;
+}
+
+wifi_error WifiLegacyHal::cancelRttRangeRequest(
+    wifi_request_id id, const std::vector<std::array<uint8_t, 6>>& mac_addrs) {
+  if (!on_rtt_results_internal_callback) {
+    return WIFI_ERROR_NOT_AVAILABLE;
+  }
+  static_assert(sizeof(mac_addr) == sizeof(std::array<uint8_t, 6>),
+                "MAC address size mismatch");
+  // TODO: How do we handle partial cancels (i.e only a subset of enabled mac
+  // addressed are cancelled).
+  std::vector<std::array<uint8_t, 6>> mac_addrs_internal(mac_addrs);
+  wifi_error status = global_func_table_.wifi_rtt_range_cancel(
+      id,
+      wlan_interface_handle_,
+      mac_addrs.size(),
+      reinterpret_cast<mac_addr*>(mac_addrs_internal.data()));
+  // If the request Id is wrong, don't stop the ongoing range request. Any
+  // other error should be treated as the end of rtt ranging.
+  if (status != WIFI_ERROR_INVALID_REQUEST_ID) {
+    on_rtt_results_internal_callback = nullptr;
+  }
+  return status;
+}
+
+std::pair<wifi_error, wifi_rtt_capabilities>
+WifiLegacyHal::getRttCapabilities() {
+  wifi_rtt_capabilities rtt_caps;
+  wifi_error status = global_func_table_.wifi_get_rtt_capabilities(
+      wlan_interface_handle_, &rtt_caps);
+  return {status, rtt_caps};
+}
+
+std::pair<wifi_error, wifi_rtt_responder> WifiLegacyHal::getRttResponderInfo() {
+  wifi_rtt_responder rtt_responder;
+  wifi_error status = global_func_table_.wifi_rtt_get_responder_info(
+      wlan_interface_handle_, &rtt_responder);
+  return {status, rtt_responder};
+}
+
+wifi_error WifiLegacyHal::enableRttResponder(
+    wifi_request_id id,
+    const wifi_channel_info& channel_hint,
+    uint32_t max_duration_secs,
+    const wifi_rtt_responder& info) {
+  wifi_rtt_responder info_internal(info);
+  return global_func_table_.wifi_enable_responder(id,
+                                                  wlan_interface_handle_,
+                                                  channel_hint,
+                                                  max_duration_secs,
+                                                  &info_internal);
+}
+
+wifi_error WifiLegacyHal::disableRttResponder(wifi_request_id id) {
+  return global_func_table_.wifi_disable_responder(id, wlan_interface_handle_);
+}
+
+wifi_error WifiLegacyHal::setRttLci(wifi_request_id id,
+                                    const wifi_lci_information& info) {
+  wifi_lci_information info_internal(info);
+  return global_func_table_.wifi_set_lci(
+      id, wlan_interface_handle_, &info_internal);
+}
+
+wifi_error WifiLegacyHal::setRttLcr(wifi_request_id id,
+                                    const wifi_lcr_information& info) {
+  wifi_lcr_information info_internal(info);
+  return global_func_table_.wifi_set_lcr(
+      id, wlan_interface_handle_, &info_internal);
+}
+
+wifi_error WifiLegacyHal::nanRegisterCallbackHandlers(
+    const NanCallbackHandlers& user_callbacks) {
+  on_nan_notify_response_user_callback = user_callbacks.on_notify_response;
+  on_nan_event_publish_terminated_user_callback =
+      user_callbacks.on_event_publish_terminated;
+  on_nan_event_match_user_callback = user_callbacks.on_event_match;
+  on_nan_event_match_expired_user_callback =
+      user_callbacks.on_event_match_expired;
+  on_nan_event_subscribe_terminated_user_callback =
+      user_callbacks.on_event_subscribe_terminated;
+  on_nan_event_followup_user_callback = user_callbacks.on_event_followup;
+  on_nan_event_disc_eng_event_user_callback =
+      user_callbacks.on_event_disc_eng_event;
+  on_nan_event_disabled_user_callback = user_callbacks.on_event_disabled;
+  on_nan_event_tca_user_callback = user_callbacks.on_event_tca;
+  on_nan_event_beacon_sdf_payload_user_callback =
+      user_callbacks.on_event_beacon_sdf_payload;
+  on_nan_event_data_path_request_user_callback =
+      user_callbacks.on_event_data_path_request;
+  on_nan_event_data_path_confirm_user_callback =
+      user_callbacks.on_event_data_path_confirm;
+  on_nan_event_data_path_end_user_callback =
+      user_callbacks.on_event_data_path_end;
+  on_nan_event_transmit_follow_up_user_callback =
+      user_callbacks.on_event_transmit_follow_up;
+  on_nan_event_range_request_user_callback =
+      user_callbacks.on_event_range_request;
+  on_nan_event_range_report_user_callback =
+      user_callbacks.on_event_range_report;
+
+  return global_func_table_.wifi_nan_register_handler(
+      wlan_interface_handle_,
+      {onAysncNanNotifyResponse,
+       onAysncNanEventPublishReplied,
+       onAysncNanEventPublishTerminated,
+       onAysncNanEventMatch,
+       onAysncNanEventMatchExpired,
+       onAysncNanEventSubscribeTerminated,
+       onAysncNanEventFollowup,
+       onAysncNanEventDiscEngEvent,
+       onAysncNanEventDisabled,
+       onAysncNanEventTca,
+       onAysncNanEventBeaconSdfPayload,
+       onAysncNanEventDataPathRequest,
+       onAysncNanEventDataPathConfirm,
+       onAysncNanEventDataPathEnd,
+       onAysncNanEventTransmitFollowUp,
+       onAysncNanEventRangeRequest,
+       onAysncNanEventRangeReport});
+}
+
+wifi_error WifiLegacyHal::nanEnableRequest(transaction_id id,
+                                           const NanEnableRequest& msg) {
+  NanEnableRequest msg_internal(msg);
+  return global_func_table_.wifi_nan_enable_request(
+      id, wlan_interface_handle_, &msg_internal);
+}
+
+wifi_error WifiLegacyHal::nanDisableRequest(transaction_id id) {
+  return global_func_table_.wifi_nan_disable_request(id,
+                                                     wlan_interface_handle_);
+}
+
+wifi_error WifiLegacyHal::nanPublishRequest(transaction_id id,
+                                            const NanPublishRequest& msg) {
+  NanPublishRequest msg_internal(msg);
+  return global_func_table_.wifi_nan_publish_request(
+      id, wlan_interface_handle_, &msg_internal);
+}
+
+wifi_error WifiLegacyHal::nanPublishCancelRequest(
+    transaction_id id, const NanPublishCancelRequest& msg) {
+  NanPublishCancelRequest msg_internal(msg);
+  return global_func_table_.wifi_nan_publish_cancel_request(
+      id, wlan_interface_handle_, &msg_internal);
+}
+
+wifi_error WifiLegacyHal::nanSubscribeRequest(transaction_id id,
+                                              const NanSubscribeRequest& msg) {
+  NanSubscribeRequest msg_internal(msg);
+  return global_func_table_.wifi_nan_subscribe_request(
+      id, wlan_interface_handle_, &msg_internal);
+}
+
+wifi_error WifiLegacyHal::nanSubscribeCancelRequest(
+    transaction_id id, const NanSubscribeCancelRequest& msg) {
+  NanSubscribeCancelRequest msg_internal(msg);
+  return global_func_table_.wifi_nan_subscribe_cancel_request(
+      id, wlan_interface_handle_, &msg_internal);
+}
+
+wifi_error WifiLegacyHal::nanTransmitFollowupRequest(
+    transaction_id id, const NanTransmitFollowupRequest& msg) {
+  NanTransmitFollowupRequest msg_internal(msg);
+  return global_func_table_.wifi_nan_transmit_followup_request(
+      id, wlan_interface_handle_, &msg_internal);
+}
+
+wifi_error WifiLegacyHal::nanStatsRequest(transaction_id id,
+                                          const NanStatsRequest& msg) {
+  NanStatsRequest msg_internal(msg);
+  return global_func_table_.wifi_nan_stats_request(
+      id, wlan_interface_handle_, &msg_internal);
+}
+
+wifi_error WifiLegacyHal::nanConfigRequest(transaction_id id,
+                                           const NanConfigRequest& msg) {
+  NanConfigRequest msg_internal(msg);
+  return global_func_table_.wifi_nan_config_request(
+      id, wlan_interface_handle_, &msg_internal);
+}
+
+wifi_error WifiLegacyHal::nanTcaRequest(transaction_id id,
+                                        const NanTCARequest& msg) {
+  NanTCARequest msg_internal(msg);
+  return global_func_table_.wifi_nan_tca_request(
+      id, wlan_interface_handle_, &msg_internal);
+}
+
+wifi_error WifiLegacyHal::nanBeaconSdfPayloadRequest(
+    transaction_id id, const NanBeaconSdfPayloadRequest& msg) {
+  NanBeaconSdfPayloadRequest msg_internal(msg);
+  return global_func_table_.wifi_nan_beacon_sdf_payload_request(
+      id, wlan_interface_handle_, &msg_internal);
+}
+
+std::pair<wifi_error, NanVersion> WifiLegacyHal::nanGetVersion() {
+  NanVersion version;
+  wifi_error status =
+      global_func_table_.wifi_nan_get_version(global_handle_, &version);
+  return {status, version};
+}
+
+wifi_error WifiLegacyHal::nanGetCapabilities(transaction_id id) {
+  return global_func_table_.wifi_nan_get_capabilities(id,
+                                                      wlan_interface_handle_);
+}
+
+wifi_error WifiLegacyHal::nanDataInterfaceCreate(
+    transaction_id id, const std::string& iface_name) {
+  return global_func_table_.wifi_nan_data_interface_create(
+      id, wlan_interface_handle_, makeCharVec(iface_name).data());
+}
+
+wifi_error WifiLegacyHal::nanDataInterfaceDelete(
+    transaction_id id, const std::string& iface_name) {
+  return global_func_table_.wifi_nan_data_interface_delete(
+      id, wlan_interface_handle_, makeCharVec(iface_name).data());
+}
+
+wifi_error WifiLegacyHal::nanDataRequestInitiator(
+    transaction_id id, const NanDataPathInitiatorRequest& msg) {
+  NanDataPathInitiatorRequest msg_internal(msg);
+  return global_func_table_.wifi_nan_data_request_initiator(
+      id, wlan_interface_handle_, &msg_internal);
+}
+
+wifi_error WifiLegacyHal::nanDataIndicationResponse(
+    transaction_id id, const NanDataPathIndicationResponse& msg) {
+  NanDataPathIndicationResponse msg_internal(msg);
+  return global_func_table_.wifi_nan_data_indication_response(
+      id, wlan_interface_handle_, &msg_internal);
+}
+
+typedef struct {
+    u8 num_ndp_instances;
+    NanDataPathId ndp_instance_id;
+} NanDataPathEndSingleNdpIdRequest;
+
+wifi_error WifiLegacyHal::nanDataEnd(transaction_id id,
+                                     uint32_t ndpInstanceId) {
+  NanDataPathEndSingleNdpIdRequest msg;
+  msg.num_ndp_instances = 1;
+  msg.ndp_instance_id = ndpInstanceId;
+  wifi_error status = global_func_table_.wifi_nan_data_end(
+      id, wlan_interface_handle_, (NanDataPathEndRequest*)&msg);
+  return status;
+}
+
+wifi_error WifiLegacyHal::setCountryCode(std::array<int8_t, 2> code) {
+  std::string code_str(code.data(), code.data() + code.size());
+  return global_func_table_.wifi_set_country_code(wlan_interface_handle_,
+                                                  code_str.c_str());
+}
+
+wifi_error WifiLegacyHal::retrieveWlanInterfaceHandle() {
+  const std::string& ifname_to_find = getStaIfaceName();
+  wifi_interface_handle* iface_handles = nullptr;
+  int num_iface_handles = 0;
+  wifi_error status = global_func_table_.wifi_get_ifaces(
+      global_handle_, &num_iface_handles, &iface_handles);
+  if (status != WIFI_SUCCESS) {
+    LOG(ERROR) << "Failed to enumerate interface handles";
+    return status;
+  }
+  for (int i = 0; i < num_iface_handles; ++i) {
+    std::array<char, IFNAMSIZ> current_ifname;
+    current_ifname.fill(0);
+    status = global_func_table_.wifi_get_iface_name(
+        iface_handles[i], current_ifname.data(), current_ifname.size());
+    if (status != WIFI_SUCCESS) {
+      LOG(WARNING) << "Failed to get interface handle name";
+      continue;
+    }
+    if (ifname_to_find == current_ifname.data()) {
+      wlan_interface_handle_ = iface_handles[i];
+      return WIFI_SUCCESS;
+    }
+  }
+  return WIFI_ERROR_UNKNOWN;
+}
+
+void WifiLegacyHal::runEventLoop() {
+  LOG(DEBUG) << "Starting legacy HAL event loop";
+  global_func_table_.wifi_event_loop(global_handle_);
+  if (!awaiting_event_loop_termination_) {
+    LOG(FATAL) << "Legacy HAL event loop terminated, but HAL was not stopping";
+  }
+  LOG(DEBUG) << "Legacy HAL event loop terminated";
+  awaiting_event_loop_termination_ = false;
+}
+
+std::pair<wifi_error, std::vector<wifi_cached_scan_results>>
+WifiLegacyHal::getGscanCachedResults() {
+  std::vector<wifi_cached_scan_results> cached_scan_results;
+  cached_scan_results.resize(kMaxCachedGscanResults);
+  int32_t num_results = 0;
+  wifi_error status = global_func_table_.wifi_get_cached_gscan_results(
+      wlan_interface_handle_,
+      true /* always flush */,
+      cached_scan_results.size(),
+      cached_scan_results.data(),
+      &num_results);
+  CHECK(num_results >= 0 &&
+        static_cast<uint32_t>(num_results) <= kMaxCachedGscanResults);
+  cached_scan_results.resize(num_results);
+  // Check for invalid IE lengths in these cached scan results and correct it.
+  for (auto& cached_scan_result : cached_scan_results) {
+    int num_scan_results = cached_scan_result.num_results;
+    for (int i = 0; i < num_scan_results; i++) {
+      auto& scan_result = cached_scan_result.results[i];
+      if (scan_result.ie_length > 0) {
+        LOG(ERROR) << "Cached scan result has non-zero IE length "
+                   << scan_result.ie_length;
+        scan_result.ie_length = 0;
+      }
+    }
+  }
+  return {status, std::move(cached_scan_results)};
+}
+
+void WifiLegacyHal::invalidate() {
+  global_handle_ = nullptr;
+  wlan_interface_handle_ = nullptr;
+  on_driver_memory_dump_internal_callback = nullptr;
+  on_firmware_memory_dump_internal_callback = nullptr;
+  on_gscan_event_internal_callback = nullptr;
+  on_gscan_full_result_internal_callback = nullptr;
+  on_link_layer_stats_result_internal_callback = nullptr;
+  on_rssi_threshold_breached_internal_callback = nullptr;
+  on_ring_buffer_data_internal_callback = nullptr;
+  on_error_alert_internal_callback = nullptr;
+  on_rtt_results_internal_callback = nullptr;
+  on_nan_notify_response_user_callback = nullptr;
+  on_nan_event_publish_terminated_user_callback = nullptr;
+  on_nan_event_match_user_callback = nullptr;
+  on_nan_event_match_expired_user_callback = nullptr;
+  on_nan_event_subscribe_terminated_user_callback = nullptr;
+  on_nan_event_followup_user_callback = nullptr;
+  on_nan_event_disc_eng_event_user_callback = nullptr;
+  on_nan_event_disabled_user_callback = nullptr;
+  on_nan_event_tca_user_callback = nullptr;
+  on_nan_event_beacon_sdf_payload_user_callback = nullptr;
+  on_nan_event_data_path_request_user_callback = nullptr;
+  on_nan_event_data_path_confirm_user_callback = nullptr;
+  on_nan_event_data_path_end_user_callback = nullptr;
+  on_nan_event_transmit_follow_up_user_callback = nullptr;
+  on_nan_event_range_request_user_callback = nullptr;
+  on_nan_event_range_report_user_callback = nullptr;
+}
+
+}  // namespace legacy_hal
+}  // namespace implementation
+}  // namespace V1_1
+}  // namespace wifi
+}  // namespace hardware
+}  // namespace android