/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <cinttypes>
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#include <cstddef>
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#include <cstring>
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#include "chre/core/event_loop_manager.h"
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#include "chre/core/wifi_request_manager.h"
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#include "chre/platform/fatal_error.h"
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#include "chre/platform/log.h"
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#include "chre/platform/system_time.h"
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#include "chre/util/system/debug_dump.h"
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#include "chre_api/chre/version.h"
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namespace chre {
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WifiRequestManager::WifiRequestManager() {
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// Reserve space for at least one scan monitoring nanoapp. This ensures that
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// the first asynchronous push_back will succeed. Future push_backs will be
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// synchronous and failures will be returned to the client.
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if (!mScanMonitorNanoapps.reserve(1)) {
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FATAL_ERROR_OOM();
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}
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}
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void WifiRequestManager::init() {
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mPlatformWifi.init();
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}
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uint32_t WifiRequestManager::getCapabilities() {
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return mPlatformWifi.getCapabilities();
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}
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bool WifiRequestManager::configureScanMonitor(Nanoapp *nanoapp, bool enable,
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const void *cookie) {
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CHRE_ASSERT(nanoapp);
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bool success = false;
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uint32_t instanceId = nanoapp->getInstanceId();
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bool hasScanMonitorRequest = nanoappHasScanMonitorRequest(instanceId);
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if (!mPendingScanMonitorRequests.empty()) {
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success = addScanMonitorRequestToQueue(nanoapp, enable, cookie);
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} else if (scanMonitorIsInRequestedState(enable, hasScanMonitorRequest)) {
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// The scan monitor is already in the requested state. A success event can
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// be posted immediately.
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success = postScanMonitorAsyncResultEvent(instanceId, true /* success */,
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enable, CHRE_ERROR_NONE, cookie);
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} else if (scanMonitorStateTransitionIsRequired(enable,
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hasScanMonitorRequest)) {
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success = addScanMonitorRequestToQueue(nanoapp, enable, cookie);
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if (success) {
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success = mPlatformWifi.configureScanMonitor(enable);
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if (!success) {
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mPendingScanMonitorRequests.pop_back();
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LOGE("Failed to enable the scan monitor for nanoapp instance %" PRIu32,
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instanceId);
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}
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}
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} else {
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CHRE_ASSERT_LOG(false, "Invalid scan monitor configuration");
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}
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return success;
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}
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bool WifiRequestManager::requestRanging(
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Nanoapp *nanoapp, const struct chreWifiRangingParams *params,
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const void *cookie) {
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CHRE_ASSERT(nanoapp);
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bool success = false;
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if (!mPendingRangingRequests.emplace()) {
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LOGE("Can't issue new RTT request; pending queue full");
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} else {
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PendingRangingRequest& req = mPendingRangingRequests.back();
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req.nanoappInstanceId = nanoapp->getInstanceId();
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req.cookie = cookie;
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if (mPendingRangingRequests.size() == 1) {
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// First in line; dispatch request immediately
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success = mPlatformWifi.requestRanging(params);
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if (!success) {
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LOGE("WiFi RTT request failed");
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mPendingRangingRequests.pop_back();
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} else {
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mRangingResponseTimeout = SystemTime::getMonotonicTime()
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+ Nanoseconds(CHRE_WIFI_RANGING_RESULT_TIMEOUT_NS);
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}
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} else {
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// Dispatch request later, after prior requests finish
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// TODO(b/65331248): use a timer to ensure the platform is meeting its
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// contract
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CHRE_ASSERT_LOG(SystemTime::getMonotonicTime() <= mRangingResponseTimeout,
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"WiFi platform didn't give callback in time");
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success = req.targetList.copy_array(params->targetList,
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params->targetListLen);
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if (!success) {
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LOG_OOM();
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mPendingRangingRequests.pop_back();
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}
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}
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}
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return success;
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}
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bool WifiRequestManager::requestScan(Nanoapp *nanoapp,
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const struct chreWifiScanParams *params,
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const void *cookie) {
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CHRE_ASSERT(nanoapp);
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// TODO(b/65331248): replace with a timer to actively check response timeout
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bool timedOut = (mScanRequestingNanoappInstanceId.has_value()
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&& mLastScanRequestTime
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+ Nanoseconds(CHRE_WIFI_SCAN_RESULT_TIMEOUT_NS)
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< SystemTime::getMonotonicTime());
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if (timedOut) {
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LOGE("Scan request async response timed out");
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mScanRequestingNanoappInstanceId.reset();
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}
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// Handle compatibility with nanoapps compiled against API v1.1, which doesn't
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// include the radioChainPref parameter in chreWifiScanParams
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struct chreWifiScanParams paramsCompat;
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if (nanoapp->getTargetApiVersion() < CHRE_API_VERSION_1_2) {
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memcpy(¶msCompat, params, offsetof(chreWifiScanParams, radioChainPref));
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paramsCompat.radioChainPref = CHRE_WIFI_RADIO_CHAIN_PREF_DEFAULT;
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params = ¶msCompat;
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}
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bool success = false;
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if (mScanRequestingNanoappInstanceId.has_value()) {
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LOGE("Active wifi scan request made while a request is in flight");
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} else {
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success = mPlatformWifi.requestScan(params);
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if (!success) {
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LOGE("Wifi scan request failed");
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} else {
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mScanRequestingNanoappInstanceId = nanoapp->getInstanceId();
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mScanRequestingNanoappCookie = cookie;
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mLastScanRequestTime = SystemTime::getMonotonicTime();
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}
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}
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return success;
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}
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void WifiRequestManager::handleScanMonitorStateChange(bool enabled,
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uint8_t errorCode) {
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struct CallbackState {
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bool enabled;
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uint8_t errorCode;
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};
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auto *cbState = memoryAlloc<CallbackState>();
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if (cbState == nullptr) {
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LOG_OOM();
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} else {
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cbState->enabled = enabled;
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cbState->errorCode = errorCode;
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auto callback = [](uint16_t /* eventType */, void *eventData) {
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auto *state = static_cast<CallbackState *>(eventData);
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EventLoopManagerSingleton::get()->getWifiRequestManager()
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.handleScanMonitorStateChangeSync(state->enabled, state->errorCode);
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memoryFree(state);
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};
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EventLoopManagerSingleton::get()->deferCallback(
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SystemCallbackType::WifiScanMonitorStateChange, cbState, callback);
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}
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}
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void WifiRequestManager::handleScanResponse(bool pending,
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uint8_t errorCode) {
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struct CallbackState {
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bool pending;
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uint8_t errorCode;
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};
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auto *cbState = memoryAlloc<CallbackState>();
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if (cbState == nullptr) {
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LOG_OOM();
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} else {
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cbState->pending = pending;
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cbState->errorCode = errorCode;
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auto callback = [](uint16_t /* eventType */, void *eventData) {
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auto *state = static_cast<CallbackState *>(eventData);
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EventLoopManagerSingleton::get()->getWifiRequestManager()
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.handleScanResponseSync(state->pending, state->errorCode);
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memoryFree(state);
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};
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EventLoopManagerSingleton::get()->deferCallback(
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SystemCallbackType::WifiRequestScanResponse, cbState, callback);
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}
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}
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void WifiRequestManager::handleRangingEvent(
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uint8_t errorCode, struct chreWifiRangingEvent *event) {
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// Use two different callbacks to avoid needing a temporary allocation to
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// carry the error code into the event loop context
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if (errorCode != CHRE_ERROR_NONE) {
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// Enables passing the error code through the event data pointer to avoid
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// allocating memory
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union NestedErrorCode {
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void *eventData;
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uint8_t errorCode;
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};
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auto errorCb = [](uint16_t /* eventType */, void *eventData) {
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NestedErrorCode cbErrorCode;
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cbErrorCode.eventData = eventData;
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EventLoopManagerSingleton::get()->getWifiRequestManager()
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.handleRangingEventSync(cbErrorCode.errorCode, nullptr);
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};
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NestedErrorCode error = {};
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error.errorCode = errorCode;
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EventLoopManagerSingleton::get()->deferCallback(
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SystemCallbackType::WifiHandleFailedRanging, error.eventData, errorCb);
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} else {
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auto successCb = [](uint16_t /* eventType */, void *eventData) {
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auto *rttEvent = static_cast<struct chreWifiRangingEvent *>(eventData);
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EventLoopManagerSingleton::get()->getWifiRequestManager()
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.handleRangingEventSync(CHRE_ERROR_NONE, rttEvent);
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};
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EventLoopManagerSingleton::get()->deferCallback(
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SystemCallbackType::WifiHandleRangingEvent, event, successCb);
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}
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}
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void WifiRequestManager::handleScanEvent(chreWifiScanEvent *event) {
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auto callback = [](uint16_t eventType, void *eventData) {
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chreWifiScanEvent *scanEvent = static_cast<chreWifiScanEvent *>(eventData);
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EventLoopManagerSingleton::get()->getWifiRequestManager()
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.postScanEventFatal(scanEvent);
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};
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EventLoopManagerSingleton::get()->deferCallback(
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SystemCallbackType::WifiHandleScanEvent, event, callback);
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}
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void WifiRequestManager::logStateToBuffer(char *buffer, size_t *bufferPos,
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size_t bufferSize) const {
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debugDumpPrint(buffer, bufferPos, bufferSize,
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"\nWifi: scan monitor %s\n",
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scanMonitorIsEnabled() ? "enabled" : "disabled");
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debugDumpPrint(buffer, bufferPos, bufferSize,
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" Wifi scan monitor enabled nanoapps:\n");
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for (const auto& instanceId : mScanMonitorNanoapps) {
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debugDumpPrint(buffer, bufferPos, bufferSize,
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" nanoappId=%" PRIu32 "\n", instanceId);
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}
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if (mScanRequestingNanoappInstanceId.has_value()) {
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debugDumpPrint(buffer, bufferPos, bufferSize,
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" Wifi request pending nanoappId=%" PRIu32 "\n",
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mScanRequestingNanoappInstanceId.value());
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}
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debugDumpPrint(buffer, bufferPos, bufferSize,
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" Wifi transition queue:\n");
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for (const auto& transition : mPendingScanMonitorRequests) {
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debugDumpPrint(buffer, bufferPos, bufferSize,
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" enable=%s nanoappId=%" PRIu32 "\n",
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transition.enable ? "true" : "false",
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transition.nanoappInstanceId);
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}
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}
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bool WifiRequestManager::scanMonitorIsEnabled() const {
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return !mScanMonitorNanoapps.empty();
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}
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bool WifiRequestManager::nanoappHasScanMonitorRequest(
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uint32_t instanceId, size_t *nanoappIndex) const {
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size_t index = mScanMonitorNanoapps.find(instanceId);
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bool hasScanMonitorRequest = (index != mScanMonitorNanoapps.size());
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if (hasScanMonitorRequest && nanoappIndex != nullptr) {
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*nanoappIndex = index;
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}
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return hasScanMonitorRequest;
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}
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bool WifiRequestManager::scanMonitorIsInRequestedState(
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bool requestedState, bool nanoappHasRequest) const {
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return (requestedState == scanMonitorIsEnabled() || (!requestedState
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&& (!nanoappHasRequest || mScanMonitorNanoapps.size() > 1)));
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}
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bool WifiRequestManager::scanMonitorStateTransitionIsRequired(
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bool requestedState, bool nanoappHasRequest) const {
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return ((requestedState && mScanMonitorNanoapps.empty())
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|| (!requestedState && nanoappHasRequest
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&& mScanMonitorNanoapps.size() == 1));
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}
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bool WifiRequestManager::addScanMonitorRequestToQueue(Nanoapp *nanoapp,
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bool enable,
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const void *cookie) {
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PendingScanMonitorRequest scanMonitorStateTransition;
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scanMonitorStateTransition.nanoappInstanceId = nanoapp->getInstanceId();
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scanMonitorStateTransition.cookie = cookie;
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scanMonitorStateTransition.enable = enable;
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bool success = mPendingScanMonitorRequests.push(scanMonitorStateTransition);
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if (!success) {
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LOGW("Too many scan monitor state transitions");
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}
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return success;
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}
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bool WifiRequestManager::updateNanoappScanMonitoringList(bool enable,
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uint32_t instanceId) {
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bool success = true;
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Nanoapp *nanoapp = EventLoopManagerSingleton::get()->getEventLoop()
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.findNanoappByInstanceId(instanceId);
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if (nanoapp == nullptr) {
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LOGW("Failed to update scan monitoring list for non-existent nanoapp");
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} else {
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size_t nanoappIndex;
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bool hasExistingRequest = nanoappHasScanMonitorRequest(instanceId,
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&nanoappIndex);
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if (enable) {
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if (!hasExistingRequest) {
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// The scan monitor was successfully enabled for this nanoapp and
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// there is no existing request. Add it to the list of scan monitoring
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// nanoapps.
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success = mScanMonitorNanoapps.push_back(instanceId);
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if (!success) {
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LOG_OOM();
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} else {
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nanoapp->registerForBroadcastEvent(CHRE_EVENT_WIFI_SCAN_RESULT);
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}
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}
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} else if (hasExistingRequest) {
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// The scan monitor was successfully disabled for a previously enabled
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// nanoapp. Remove it from the list of scan monitoring nanoapps.
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mScanMonitorNanoapps.erase(nanoappIndex);
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nanoapp->unregisterForBroadcastEvent(CHRE_EVENT_WIFI_SCAN_RESULT);
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} // else disabling an inactive request, treat as success per the CHRE API.
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}
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return success;
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}
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bool WifiRequestManager::postScanMonitorAsyncResultEvent(
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uint32_t nanoappInstanceId, bool success, bool enable, uint8_t errorCode,
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const void *cookie) {
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// Allocate and post an event to the nanoapp requesting wifi.
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bool eventPosted = false;
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if (!success || updateNanoappScanMonitoringList(enable, nanoappInstanceId)) {
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chreAsyncResult *event = memoryAlloc<chreAsyncResult>();
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if (event == nullptr) {
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LOG_OOM();
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} else {
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event->requestType = CHRE_WIFI_REQUEST_TYPE_CONFIGURE_SCAN_MONITOR;
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event->success = success;
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event->errorCode = errorCode;
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event->reserved = 0;
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event->cookie = cookie;
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// Post the event.
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eventPosted = EventLoopManagerSingleton::get()->getEventLoop()
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.postEvent(CHRE_EVENT_WIFI_ASYNC_RESULT, event, freeEventDataCallback,
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kSystemInstanceId, nanoappInstanceId);
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if (!eventPosted) {
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memoryFree(event);
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}
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}
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}
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return eventPosted;
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}
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void WifiRequestManager::postScanMonitorAsyncResultEventFatal(
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uint32_t nanoappInstanceId, bool success, bool enable, uint8_t errorCode,
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const void *cookie) {
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if (!postScanMonitorAsyncResultEvent(nanoappInstanceId, success, enable,
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errorCode, cookie)) {
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FATAL_ERROR("Failed to send WiFi scan monitor async result event");
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}
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}
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bool WifiRequestManager::postScanRequestAsyncResultEvent(
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uint32_t nanoappInstanceId, bool success, uint8_t errorCode,
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const void *cookie) {
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bool eventPosted = false;
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chreAsyncResult *event = memoryAlloc<chreAsyncResult>();
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if (event == nullptr) {
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LOG_OOM();
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} else {
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event->requestType = CHRE_WIFI_REQUEST_TYPE_REQUEST_SCAN;
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event->success = success;
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event->errorCode = errorCode;
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event->reserved = 0;
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event->cookie = cookie;
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// Post the event.
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eventPosted = EventLoopManagerSingleton::get()->getEventLoop()
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.postEvent(CHRE_EVENT_WIFI_ASYNC_RESULT, event, freeEventDataCallback,
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kSystemInstanceId, nanoappInstanceId);
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}
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return eventPosted;
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}
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void WifiRequestManager::postScanRequestAsyncResultEventFatal(
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uint32_t nanoappInstanceId, bool success, uint8_t errorCode,
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const void *cookie) {
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if (!postScanRequestAsyncResultEvent(nanoappInstanceId, success, errorCode,
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cookie)) {
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FATAL_ERROR("Failed to send WiFi scan request async result event");
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}
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}
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void WifiRequestManager::postScanEventFatal(chreWifiScanEvent *event) {
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EventLoopManagerSingleton::get()->getEventLoop()
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.postEvent(CHRE_EVENT_WIFI_SCAN_RESULT, event, freeWifiScanEventCallback);
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}
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void WifiRequestManager::handleScanMonitorStateChangeSync(bool enabled,
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uint8_t errorCode) {
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// Success is defined as having no errors ... in life ༼ つ ◕_◕ ༽つ
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bool success = (errorCode == CHRE_ERROR_NONE);
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// TODO(b/62904616): re-enable this assertion
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//CHRE_ASSERT_LOG(!mScanMonitorStateTransitions.empty(),
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// "handleScanMonitorStateChangeSync called with no transitions");
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if (mPendingScanMonitorRequests.empty()) {
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LOGE("WiFi PAL error: handleScanMonitorStateChangeSync called with no "
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"transitions (enabled %d errorCode %" PRIu8 ")", enabled, errorCode);
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}
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// Always check the front of the queue.
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if (!mPendingScanMonitorRequests.empty()) {
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const auto& stateTransition = mPendingScanMonitorRequests.front();
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success &= (stateTransition.enable == enabled);
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postScanMonitorAsyncResultEventFatal(stateTransition.nanoappInstanceId,
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success, stateTransition.enable,
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errorCode, stateTransition.cookie);
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mPendingScanMonitorRequests.pop();
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}
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while (!mPendingScanMonitorRequests.empty()) {
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const auto& stateTransition = mPendingScanMonitorRequests.front();
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bool hasScanMonitorRequest = nanoappHasScanMonitorRequest(
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stateTransition.nanoappInstanceId);
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if (scanMonitorIsInRequestedState(
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stateTransition.enable, hasScanMonitorRequest)) {
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// We are already in the target state so just post an event indicating
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// success
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postScanMonitorAsyncResultEventFatal(stateTransition.nanoappInstanceId,
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true /* success */,
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stateTransition.enable,
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CHRE_ERROR_NONE,
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stateTransition.cookie);
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} else if (scanMonitorStateTransitionIsRequired(
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stateTransition.enable, hasScanMonitorRequest)) {
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if (mPlatformWifi.configureScanMonitor(stateTransition.enable)) {
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break;
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} else {
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postScanMonitorAsyncResultEventFatal(stateTransition.nanoappInstanceId,
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false /* success */,
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stateTransition.enable, CHRE_ERROR,
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stateTransition.cookie);
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}
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} else {
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CHRE_ASSERT_LOG(false, "Invalid scan monitor state");
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break;
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}
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mPendingScanMonitorRequests.pop();
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}
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}
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void WifiRequestManager::handleScanResponseSync(bool pending,
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uint8_t errorCode) {
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// TODO(b/65206783): re-enable this assertion
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//CHRE_ASSERT_LOG(mScanRequestingNanoappInstanceId.has_value(),
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// "handleScanResponseSync called with no outstanding request");
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if (!mScanRequestingNanoappInstanceId.has_value()) {
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LOGE("handleScanResponseSync called with no outstanding request");
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}
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// TODO: raise this to CHRE_ASSERT_LOG
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if (!pending && errorCode == CHRE_ERROR_NONE) {
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LOGE("Invalid wifi scan response");
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errorCode = CHRE_ERROR;
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}
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if (mScanRequestingNanoappInstanceId.has_value()) {
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bool success = (pending && errorCode == CHRE_ERROR_NONE);
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if (!success) {
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LOGW("Wifi scan request failed: pending %d, errorCode %" PRIu8,
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pending, errorCode);
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}
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postScanRequestAsyncResultEventFatal(*mScanRequestingNanoappInstanceId,
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success, errorCode,
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mScanRequestingNanoappCookie);
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// Set a flag to indicate that results may be pending.
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mScanRequestResultsArePending = pending;
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if (pending) {
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Nanoapp *nanoapp = EventLoopManagerSingleton::get()->getEventLoop()
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.findNanoappByInstanceId(*mScanRequestingNanoappInstanceId);
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if (nanoapp == nullptr) {
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LOGW("Received WiFi scan response for unknown nanoapp");
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} else {
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nanoapp->registerForBroadcastEvent(CHRE_EVENT_WIFI_SCAN_RESULT);
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}
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} else {
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// If the scan results are not pending, clear the nanoapp instance ID.
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// Otherwise, wait for the results to be delivered and then clear the
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// instance ID.
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mScanRequestingNanoappInstanceId.reset();
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}
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}
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}
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bool WifiRequestManager::postRangingAsyncResult(uint8_t errorCode) {
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bool eventPosted = false;
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if (mPendingRangingRequests.empty()) {
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LOGE("Unexpected ranging event callback");
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} else {
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auto *event = memoryAlloc<struct chreAsyncResult>();
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if (event == nullptr) {
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LOG_OOM();
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} else {
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const PendingRangingRequest& req = mPendingRangingRequests.front();
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event->requestType = CHRE_WIFI_REQUEST_TYPE_RANGING;
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event->success = (errorCode == CHRE_ERROR_NONE);
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event->errorCode = errorCode;
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event->reserved = 0;
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event->cookie = req.cookie;
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eventPosted = EventLoopManagerSingleton::get()->getEventLoop().postEvent(
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CHRE_EVENT_WIFI_ASYNC_RESULT, event, freeEventDataCallback,
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kSystemInstanceId, req.nanoappInstanceId);
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if (!eventPosted) {
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memoryFree(event);
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}
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}
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}
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return eventPosted;
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}
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bool WifiRequestManager::dispatchQueuedRangingRequest() {
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const PendingRangingRequest& req = mPendingRangingRequests.front();
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struct chreWifiRangingParams params = {};
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params.targetListLen = static_cast<uint8_t>(req.targetList.size());
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params.targetList = req.targetList.data();
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bool success = mPlatformWifi.requestRanging(¶ms);
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if (!success) {
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LOGE("Failed to issue queued ranging result");
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postRangingAsyncResult(CHRE_ERROR);
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mPendingRangingRequests.pop();
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} else {
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mRangingResponseTimeout = SystemTime::getMonotonicTime()
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+ Nanoseconds(CHRE_WIFI_RANGING_RESULT_TIMEOUT_NS);
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}
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return success;
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}
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void WifiRequestManager::handleRangingEventSync(
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uint8_t errorCode, struct chreWifiRangingEvent *event) {
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if (postRangingAsyncResult(errorCode)) {
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if (errorCode != CHRE_ERROR_NONE) {
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LOGW("RTT ranging failed with error %d", errorCode);
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} else {
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EventLoopManagerSingleton::get()->getEventLoop().postEvent(
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CHRE_EVENT_WIFI_RANGING_RESULT, event, freeWifiRangingEventCallback,
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kSystemInstanceId, mPendingRangingRequests.front().nanoappInstanceId);
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}
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mPendingRangingRequests.pop();
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}
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// If we have any pending requests, try issuing them to the platform until the
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// first one succeeds
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while (!mPendingRangingRequests.empty() && !dispatchQueuedRangingRequest());
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}
|
|
void WifiRequestManager::handleFreeWifiScanEvent(chreWifiScanEvent *scanEvent) {
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if (mScanRequestResultsArePending) {
|
// Reset the event distribution logic once an entire scan event has been
|
// received and processed by the nanoapp requesting the scan event.
|
mScanEventResultCountAccumulator += scanEvent->resultCount;
|
if (mScanEventResultCountAccumulator >= scanEvent->resultTotal) {
|
mScanEventResultCountAccumulator = 0;
|
mScanRequestResultsArePending = false;
|
}
|
|
if (!mScanRequestResultsArePending
|
&& mScanRequestingNanoappInstanceId.has_value()) {
|
Nanoapp *nanoapp = EventLoopManagerSingleton::get()->getEventLoop()
|
.findNanoappByInstanceId(*mScanRequestingNanoappInstanceId);
|
if (nanoapp == nullptr) {
|
LOGW("Attempted to unsubscribe unknown nanoapp from WiFi scan events");
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} else if (!nanoappHasScanMonitorRequest(
|
*mScanRequestingNanoappInstanceId)) {
|
nanoapp->unregisterForBroadcastEvent(CHRE_EVENT_WIFI_SCAN_RESULT);
|
}
|
|
mScanRequestingNanoappInstanceId.reset();
|
}
|
}
|
|
mPlatformWifi.releaseScanEvent(scanEvent);
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}
|
|
void WifiRequestManager::freeWifiScanEventCallback(uint16_t eventType,
|
void *eventData) {
|
chreWifiScanEvent *scanEvent = static_cast<chreWifiScanEvent *>(eventData);
|
EventLoopManagerSingleton::get()->getWifiRequestManager()
|
.handleFreeWifiScanEvent(scanEvent);
|
}
|
|
void WifiRequestManager::freeWifiRangingEventCallback(uint16_t eventType,
|
void *eventData) {
|
auto *event = static_cast<struct chreWifiRangingEvent *>(eventData);
|
EventLoopManagerSingleton::get()->getWifiRequestManager()
|
.mPlatformWifi.releaseRangingEvent(event);
|
}
|
|
} // namespace chre
|