namespace V1_0 {
namespace implementation {
namespace legacy_hal {
-// Constants used in the class.
+// 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;
// Legacy HAL functions accept "C" style function pointers, so use global
// functions to pass to the legacy HAL function and store the corresponding
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 onGscanEvent(wifi_request_id id, wifi_scan_event event) {
+ 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 onGscanFullResult(wifi_request_id id,
+ wifi_scan_result* result,
+ uint32_t buckets_scanned) {
+ if (on_gscan_full_result_internal_callback) {
+ on_gscan_full_result_internal_callback(id, result, buckets_scanned);
+ }
+}
+
// End of the free-standing "C" style callbacks.
WifiLegacyHal::WifiLegacyHal()
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 = {onGscanFullResult, onGscanEvent};
+ 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::getValidFrequenciesForGscan(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::retrieveWlanInterfaceHandle() {
const std::string& ifname_to_find = getStaIfaceName();
wifi_interface_handle* iface_handles = nullptr;
if_tool.SetWifiUpState(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_stop_complete_internal_callback = 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;
}
} // namespace legacy_hal
uint32_t max_len;
};
+// Full scan results contain IE info and are hence passed by reference, to
+// preserve the variable length array member |ie_data|. Callee must not retain
+// the pointer.
+using on_gscan_full_result_callback =
+ std::function<void(wifi_request_id, const wifi_scan_result*, uint32_t)>;
+// These scan results don't contain any IE info, so no need to pass by
+// reference.
+using on_gscan_results_callback = std::function<void(
+ wifi_request_id, const std::vector<wifi_cached_scan_results>&)>;
+
/**
* Class that encapsulates all legacy HAL interactions.
* This class manages the lifetime of the event loop thread used by legacy HAL.
// APF functions.
std::pair<wifi_error, PacketFilterCapabilities> getPacketFilterCapabilities();
wifi_error setPacketFilter(const std::vector<uint8_t>& program);
+ // Gscan functions.
+ std::pair<wifi_error, wifi_gscan_capabilities> getGscanCapabilities();
+ // These API's provides a simplified interface over the legacy Gscan API's:
+ // a) All scan events from the legacy HAL API other than the
+ // |WIFI_SCAN_FAILED| are treated as notification of results.
+ // This method then retrieves the cached scan results from the legacy
+ // HAL API and triggers the externally provided |on_results_user_callback|
+ // on success.
+ // b) |WIFI_SCAN_FAILED| scan event or failure to retrieve cached scan results
+ // triggers the externally provided |on_failure_user_callback|.
+ // c) Full scan result event triggers the externally provided
+ // |on_full_result_user_callback|.
+ wifi_error startGscan(
+ wifi_request_id id,
+ const wifi_scan_cmd_params& params,
+ const std::function<void(wifi_request_id)>& on_failure_callback,
+ const on_gscan_results_callback& on_results_callback,
+ const on_gscan_full_result_callback& on_full_result_callback);
+ wifi_error stopGscan(wifi_request_id id);
+ std::pair<wifi_error, std::vector<uint32_t>> getValidFrequenciesForGscan(
+ wifi_band band);
private:
// Retrieve the interface handle to be used for the "wlan" interface.
wifi_error retrieveWlanInterfaceHandle();
// Run the legacy HAL event loop thread.
void runEventLoop();
+ // Retrieve the cached gscan results to pass the results back to the external
+ // callbacks.
+ std::pair<wifi_error, std::vector<wifi_cached_scan_results>>
+ getGscanCachedResults();
void invalidate();
// Event loop thread used by legacy HAL.
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