1 /*
2  * Copyright (C) 2019 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 "CanBusVirtual.h"
18 
19 #include <android-base/logging.h>
20 #include <libnetdevice/libnetdevice.h>
21 
22 namespace android::hardware::automotive::can::V1_0::implementation {
23 
CanBusVirtual(const std::string & ifname)24 CanBusVirtual::CanBusVirtual(const std::string& ifname) : CanBus(ifname) {}
25 
preUp()26 ICanController::Result CanBusVirtual::preUp() {
27     if (netdevice::exists(mIfname)) return ICanController::Result::OK;
28 
29     LOG(DEBUG) << "Virtual interface " << mIfname << " doesn't exist, creating...";
30     mWasCreated = true;
31     if (!netdevice::add(mIfname, "vcan")) {
32         LOG(ERROR) << "Can't create vcan interface " << mIfname;
33         return ICanController::Result::UNKNOWN_ERROR;
34     }
35 
36     return ICanController::Result::OK;
37 }
38 
postDown()39 bool CanBusVirtual::postDown() {
40     if (mWasCreated) {
41         mWasCreated = false;
42         if (!netdevice::del(mIfname)) {
43             LOG(ERROR) << "Couldn't remove vcan interface " << mIfname;
44             return false;
45         }
46     }
47     return true;
48 }
49 
50 }  // namespace android::hardware::automotive::can::V1_0::implementation
51