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/*
* Copyright (C) 2020 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.bpf;
import android.net.MacAddress;
import androidx.annotation.NonNull;
import com.android.net.module.util.Struct;
import com.android.net.module.util.Struct.Field;
import com.android.net.module.util.Struct.Type;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Objects;
/** Value type for downstream & upstream IPv4 forwarding maps. */
public class Tether4Value extends Struct {
@Field(order = 0, type = Type.U32)
public final long oif;
// The ethhdr struct which is defined in uapi/linux/if_ether.h
@Field(order = 1, type = Type.EUI48)
public final MacAddress ethDstMac;
@Field(order = 2, type = Type.EUI48)
public final MacAddress ethSrcMac;
@Field(order = 3, type = Type.UBE16)
public final int ethProto; // Packet type ID field.
@Field(order = 4, type = Type.U16)
public final int pmtu;
@Field(order = 5, type = Type.ByteArray, arraysize = 16)
public final byte[] src46;
@Field(order = 6, type = Type.ByteArray, arraysize = 16)
public final byte[] dst46;
@Field(order = 7, type = Type.UBE16)
public final int srcPort;
@Field(order = 8, type = Type.UBE16)
public final int dstPort;
// TODO: consider using U64.
@Field(order = 9, type = Type.U63)
public final long lastUsed;
public Tether4Value(final long oif, @NonNull final MacAddress ethDstMac,
@NonNull final MacAddress ethSrcMac, final int ethProto, final int pmtu,
final byte[] src46, final byte[] dst46, final int srcPort,
final int dstPort, final long lastUsed) {
Objects.requireNonNull(ethDstMac);
Objects.requireNonNull(ethSrcMac);
this.oif = oif;
this.ethDstMac = ethDstMac;
this.ethSrcMac = ethSrcMac;
this.ethProto = ethProto;
this.pmtu = pmtu;
this.src46 = src46;
this.dst46 = dst46;
this.srcPort = srcPort;
this.dstPort = dstPort;
this.lastUsed = lastUsed;
}
@Override
public String toString() {
try {
return String.format(
"oif: %d, ethDstMac: %s, ethSrcMac: %s, ethProto: %d, pmtu: %d, "
+ "src46: %s, dst46: %s, srcPort: %d, dstPort: %d, "
+ "lastUsed: %d",
oif, ethDstMac, ethSrcMac, ethProto, pmtu,
InetAddress.getByAddress(src46), InetAddress.getByAddress(dst46),
Short.toUnsignedInt((short) srcPort), Short.toUnsignedInt((short) dstPort),
lastUsed);
} catch (UnknownHostException | IllegalArgumentException e) {
return String.format("Invalid IP address", e);
}
}
}
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