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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include <binder/IPCThreadState.h>
     18 #include <hidl/HidlTransportSupport.h>
     19 #include <hwbinder/IPCThreadState.h>
     20 #include "Controllers.h"
     21 #include "Fwmark.h"
     22 #include "NetdHwService.h"
     23 
     24 using android::hardware::configureRpcThreadpool;
     25 using android::hardware::IPCThreadState;
     26 using android::hardware::Void;
     27 
     28 namespace android {
     29 namespace net {
     30 
     31 /**
     32  * This lock exists to make NetdHwService RPCs (which come in on multiple HwBinder threads)
     33  * coexist with the commands in CommandListener.cpp. These are presumed not thread-safe because
     34  * CommandListener has only one user (NetworkManagementService), which is connected through a
     35  * FrameworkListener that passes in commands one at a time.
     36  */
     37 extern android::RWLock gBigNetdLock;
     38 
     39 static INetd::StatusCode toHalStatus(int ret) {
     40     switch(ret) {
     41         case 0:
     42             return INetd::StatusCode::OK;
     43         case -EINVAL:
     44             return INetd::StatusCode::INVALID_ARGUMENTS;
     45         case -EEXIST:
     46             return INetd::StatusCode::ALREADY_EXISTS;
     47         case -ENONET:
     48             return INetd::StatusCode::NO_NETWORK;
     49         case -EPERM:
     50             return INetd::StatusCode::PERMISSION_DENIED;
     51         default:
     52             ALOGE("HAL service error=%d", ret);
     53             return INetd::StatusCode::UNKNOWN_ERROR;
     54     }
     55 }
     56 
     57 // Minimal service start.
     58 status_t NetdHwService::start() {
     59     IPCThreadState::self()->disableBackgroundScheduling(true);
     60     // Usage of this HAL is anticipated to be thin; one thread should suffice.
     61     configureRpcThreadpool(1, false /* callerWillNotJoin */);
     62     // Register hardware service with ServiceManager.
     63     return INetd::registerAsService();
     64 }
     65 
     66 Return<void> NetdHwService::createOemNetwork(createOemNetwork_cb _hidl_cb) {
     67     unsigned netId;
     68     Permission permission = PERMISSION_SYSTEM;
     69 
     70     android::RWLock::AutoWLock _lock(gBigNetdLock);
     71     int ret = gCtls->netCtrl.createPhysicalOemNetwork(permission, &netId);
     72 
     73     Fwmark fwmark;
     74     fwmark.netId = netId;
     75     fwmark.explicitlySelected = true;
     76     fwmark.protectedFromVpn = true;
     77     fwmark.permission = PERMISSION_SYSTEM;
     78     _hidl_cb(netIdToNetHandle(netId), fwmark.intValue, toHalStatus(ret));
     79 
     80     return Void();
     81 }
     82 
     83 Return<INetd::StatusCode> NetdHwService::destroyOemNetwork(uint64_t netHandle) {
     84     unsigned netId = netHandleToNetId(netHandle);
     85     if ((netId < NetworkController::MIN_OEM_ID) ||
     86             (netId > NetworkController::MAX_OEM_ID)) {
     87         return INetd::StatusCode::INVALID_ARGUMENTS;
     88     }
     89 
     90     android::RWLock::AutoWLock _lock(gBigNetdLock);
     91 
     92     return toHalStatus(gCtls->netCtrl.destroyNetwork(netId));
     93 }
     94 
     95 }  // namespace net
     96 }  // namespace android
     97