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/*
* Copyright 2020 The Netty Project
*
* The Netty Project licenses this file to you 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:
*
* https://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 org.apache.hbase.thirdparty.io.netty.handler.pcap;
import org.apache.hbase.thirdparty.io.netty.buffer.ByteBuf;
final class IPPacket {
private static final byte MAX_TTL = (byte) 255;
private static final short V4_HEADER_SIZE = 20;
private static final byte TCP = 6 & 0xff;
private static final byte UDP = 17 & 0xff;
/**
* Version + Traffic class + Flow label
*/
private static final int IPV6_VERSION_TRAFFIC_FLOW = 60000000;
private IPPacket() {
// Prevent outside initialization
}
/**
* Write IPv4 Packet for UDP Packet
*
* @param byteBuf ByteBuf where IP Packet data will be set
* @param payload Payload of UDP
* @param srcAddress Source IPv4 Address
* @param dstAddress Destination IPv4 Address
*/
static void writeUDPv4(ByteBuf byteBuf, ByteBuf payload, int srcAddress, int dstAddress) {
writePacketv4(byteBuf, payload, UDP, srcAddress, dstAddress);
}
/**
* Write IPv6 Packet for UDP Packet
*
* @param byteBuf ByteBuf where IP Packet data will be set
* @param payload Payload of UDP
* @param srcAddress Source IPv6 Address
* @param dstAddress Destination IPv6 Address
*/
static void writeUDPv6(ByteBuf byteBuf, ByteBuf payload, byte[] srcAddress, byte[] dstAddress) {
writePacketv6(byteBuf, payload, UDP, srcAddress, dstAddress);
}
/**
* Write IPv4 Packet for TCP Packet
*
* @param byteBuf ByteBuf where IP Packet data will be set
* @param payload Payload of TCP
* @param srcAddress Source IPv4 Address
* @param dstAddress Destination IPv4 Address
*/
static void writeTCPv4(ByteBuf byteBuf, ByteBuf payload, int srcAddress, int dstAddress) {
writePacketv4(byteBuf, payload, TCP, srcAddress, dstAddress);
}
/**
* Write IPv6 Packet for TCP Packet
*
* @param byteBuf ByteBuf where IP Packet data will be set
* @param payload Payload of TCP
* @param srcAddress Source IPv6 Address
* @param dstAddress Destination IPv6 Address
*/
static void writeTCPv6(ByteBuf byteBuf, ByteBuf payload, byte[] srcAddress, byte[] dstAddress) {
writePacketv6(byteBuf, payload, TCP, srcAddress, dstAddress);
}
private static void writePacketv4(ByteBuf byteBuf, ByteBuf payload, int protocol, int srcAddress,
int dstAddress) {
byteBuf.writeByte(0x45); // Version + IHL
byteBuf.writeByte(0x00); // DSCP
byteBuf.writeShort(V4_HEADER_SIZE + payload.readableBytes()); // Length
byteBuf.writeShort(0x0000); // Identification
byteBuf.writeShort(0x0000); // Fragment
byteBuf.writeByte(MAX_TTL); // TTL
byteBuf.writeByte(protocol); // Protocol
byteBuf.writeShort(0); // Checksum
byteBuf.writeInt(srcAddress); // Source IPv4 Address
byteBuf.writeInt(dstAddress); // Destination IPv4 Address
byteBuf.writeBytes(payload); // Payload of L4
}
private static void writePacketv6(ByteBuf byteBuf, ByteBuf payload, int protocol, byte[] srcAddress,
byte[] dstAddress) {
byteBuf.writeInt(IPV6_VERSION_TRAFFIC_FLOW); // Version + Traffic class + Flow label
byteBuf.writeShort(payload.readableBytes()); // Payload length
byteBuf.writeByte(protocol & 0xff); // Next header
byteBuf.writeByte(MAX_TTL); // Hop limit
byteBuf.writeBytes(srcAddress); // Source IPv6 Address
byteBuf.writeBytes(dstAddress); // Destination IPv6 Address
byteBuf.writeBytes(payload); // Payload of L4
}
}
