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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 java.io.IOException;
/**
* Contains mostly tc-related functionality.
*/
public class TcUtils {
static {
System.loadLibrary(JniUtil.getJniLibraryName(TcUtils.class.getPackage()));
}
/**
* Checks if the network interface uses an ethernet L2 header.
*
* @param iface the network interface.
* @return true if the interface uses an ethernet L2 header.
* @throws IOException
*/
public static native boolean isEthernet(String iface) throws IOException;
/**
* Attach a tc bpf filter.
*
* Equivalent to the following 'tc' command:
* tc filter add dev .. in/egress prio .. protocol ipv6/ip bpf object-pinned
* /sys/fs/bpf/... direct-action
*
* @param ifIndex the network interface index.
* @param ingress ingress or egress qdisc.
* @param prio
* @param proto
* @param bpfProgPath
* @throws IOException
*/
public static native void tcFilterAddDevBpf(int ifIndex, boolean ingress, short prio,
short proto, String bpfProgPath) throws IOException;
/**
* Attach a tc police action.
*
* Attaches a matchall filter to the clsact qdisc with a tc police and tc bpf action attached.
* This causes the ingress rate to be limited and exceeding packets to be forwarded to a bpf
* program (specified in bpfProgPah) that accounts for the packets before dropping them.
*
* Equivalent to the following 'tc' command:
* tc filter add dev .. ingress prio .. protocol .. matchall \
* action police rate .. burst .. conform-exceed pipe/continue \
* action bpf object-pinned .. \
* drop
*
* @param ifIndex the network interface index.
* @param prio the filter preference.
* @param proto protocol.
* @param rateInBytesPerSec rate limit in bytes/s.
* @param bpfProgPath bpg program that accounts for rate exceeding packets before they are
* dropped.
* @throws IOException
*/
public static native void tcFilterAddDevIngressPolice(int ifIndex, short prio, short proto,
int rateInBytesPerSec, String bpfProgPath) throws IOException;
/**
* Delete a tc filter.
*
* Equivalent to the following 'tc' command:
* tc filter del dev .. in/egress prio .. protocol ..
*
* @param ifIndex the network interface index.
* @param ingress ingress or egress qdisc.
* @param prio the filter preference.
* @param proto protocol.
* @throws IOException
*/
public static native void tcFilterDelDev(int ifIndex, boolean ingress, short prio,
short proto) throws IOException;
/**
* Add a clsact qdisc.
*
* Equivalent to the following 'tc' command:
* tc qdisc add dev .. clsact
*
* @param ifIndex the network interface index.
* @throws IOException
*/
public static native void tcQdiscAddDevClsact(int ifIndex) throws IOException;
}
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