1 /*
2  * Copyright 2022, 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 aidl::android::hardware::automotive::can {
23 
24 using namespace ::android;
25 
CanBusVirtual(const std::string & ifname)26 CanBusVirtual::CanBusVirtual(const std::string& ifname) : CanBus(ifname) {}
27 
preUp()28 Result CanBusVirtual::preUp() {
29     if (netdevice::exists(mIfname)) return Result::OK;
30 
31     LOG(DEBUG) << "Virtual interface " << mIfname << " doesn't exist, creating...";
32     mWasCreated = true;
33     if (!netdevice::add(mIfname, "vcan")) {
34         LOG(ERROR) << "Can't create vcan interface " << mIfname;
35         return Result::UNKNOWN_ERROR;
36     }
37 
38     return Result::OK;
39 }
40 
postDown()41 bool CanBusVirtual::postDown() {
42     if (mWasCreated) {
43         mWasCreated = false;
44         if (!netdevice::del(mIfname)) {
45             LOG(ERROR) << "Couldn't remove vcan interface " << mIfname;
46             return false;
47         }
48     }
49     return true;
50 }
51 
52 }  // namespace aidl::android::hardware::automotive::can
53