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/*
* Copyright (C) 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.net.module.util;
import androidx.annotation.NonNull;
import java.io.IOException;
/**
* The classes and the methods for BPF utilization.
*
* {@hide}
*/
public class BpfUtils {
static {
System.loadLibrary(JniUtil.getJniLibraryName(BpfUtils.class.getPackage()));
}
// Defined in include/uapi/linux/bpf.h. Only adding the CGROUPS currently being used for now.
public static final int BPF_CGROUP_INET_INGRESS = 0;
public static final int BPF_CGROUP_INET_EGRESS = 1;
public static final int BPF_CGROUP_INET4_BIND = 8;
public static final int BPF_CGROUP_INET6_BIND = 9;
/**
* Attach BPF program to CGROUP
*/
public static void attachProgram(int type, @NonNull String programPath,
@NonNull String cgroupPath, int flags) throws IOException {
native_attachProgramToCgroup(type, programPath, cgroupPath, flags);
}
/**
* Detach BPF program from CGROUP
*/
public static void detachProgram(int type, @NonNull String cgroupPath)
throws IOException {
native_detachProgramFromCgroup(type, cgroupPath);
}
/**
* Detach single BPF program from CGROUP
*/
public static void detachSingleProgram(int type, @NonNull String programPath,
@NonNull String cgroupPath) throws IOException {
native_detachSingleProgramFromCgroup(type, programPath, cgroupPath);
}
private static native boolean native_attachProgramToCgroup(int type, String programPath,
String cgroupPath, int flags) throws IOException;
private static native boolean native_detachProgramFromCgroup(int type, String cgroupPath)
throws IOException;
private static native boolean native_detachSingleProgramFromCgroup(int type,
String programPath, String cgroupPath) throws IOException;
}
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