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/*
* Copyright 2014 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:
*
* 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 io.netty.channel.epoll;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelOutboundBuffer;
import io.netty.channel.ChannelOutboundBuffer.MessageProcessor;
import io.netty.channel.socket.DatagramPacket;
import io.netty.channel.unix.IovArray;
import io.netty.channel.unix.Limits;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import static io.netty.channel.unix.Limits.UIO_MAX_IOV;
import static io.netty.channel.unix.NativeInetAddress.copyIpv4MappedIpv6Address;
/**
* Support sendmmsg(...) on linux with GLIBC 2.14+
*/
final class NativeDatagramPacketArray {
// Use UIO_MAX_IOV as this is the maximum number we can write with one sendmmsg(...) call.
private final NativeDatagramPacket[] packets = new NativeDatagramPacket[UIO_MAX_IOV];
// We share one IovArray for all NativeDatagramPackets to reduce memory overhead. This will allow us to write
// up to IOV_MAX iovec across all messages in one sendmmsg(...) call.
private final IovArray iovArray = new IovArray();
// temporary array to copy the ipv4 part of ipv6-mapped-ipv4 addresses and then create a Inet4Address out of it.
private final byte[] ipv4Bytes = new byte[4];
private final MyMessageProcessor processor = new MyMessageProcessor();
private int count;
NativeDatagramPacketArray() {
for (int i = 0; i < packets.length; i++) {
packets[i] = new NativeDatagramPacket();
}
}
boolean addWritable(ByteBuf buf, int index, int len) {
return add0(buf, index, len, null);
}
private boolean add0(ByteBuf buf, int index, int len, InetSocketAddress recipient) {
if (count == packets.length) {
// We already filled up to UIO_MAX_IOV messages. This is the max allowed per
// recvmmsg(...) / sendmmsg(...) call, we will try again later.
return false;
}
if (len == 0) {
return true;
}
int offset = iovArray.count();
if (offset == Limits.IOV_MAX || !iovArray.add(buf, index, len)) {
// Not enough space to hold the whole content, we will try again later.
return false;
}
NativeDatagramPacket p = packets[count];
p.init(iovArray.memoryAddress(offset), iovArray.count() - offset, recipient);
count++;
return true;
}
void add(ChannelOutboundBuffer buffer, boolean connected) throws Exception {
processor.connected = connected;
buffer.forEachFlushedMessage(processor);
}
/**
* Returns the count
*/
int count() {
return count;
}
/**
* Returns an array with {@link #count()} {@link NativeDatagramPacket}s filled.
*/
NativeDatagramPacket[] packets() {
return packets;
}
void clear() {
this.count = 0;
this.iovArray.clear();
}
void release() {
iovArray.release();
}
private final class MyMessageProcessor implements MessageProcessor {
private boolean connected;
@Override
public boolean processMessage(Object msg) {
if (msg instanceof DatagramPacket) {
DatagramPacket packet = (DatagramPacket) msg;
ByteBuf buf = packet.content();
return add0(buf, buf.readerIndex(), buf.readableBytes(), packet.recipient());
}
if (msg instanceof ByteBuf && connected) {
ByteBuf buf = (ByteBuf) msg;
return add0(buf, buf.readerIndex(), buf.readableBytes(), null);
}
return false;
}
}
/**
* Used to pass needed data to JNI.
*/
@SuppressWarnings("unused")
final class NativeDatagramPacket {
// This is the actual struct iovec*
private long memoryAddress;
private int count;
private final byte[] addr = new byte[16];
private int addrLen;
private int scopeId;
private int port;
private void init(long memoryAddress, int count, InetSocketAddress recipient) {
this.memoryAddress = memoryAddress;
this.count = count;
if (recipient == null) {
this.scopeId = 0;
this.port = 0;
this.addrLen = 0;
} else {
InetAddress address = recipient.getAddress();
if (address instanceof Inet6Address) {
System.arraycopy(address.getAddress(), 0, addr, 0, addr.length);
scopeId = ((Inet6Address) address).getScopeId();
} else {
copyIpv4MappedIpv6Address(address.getAddress(), addr);
scopeId = 0;
}
addrLen = addr.length;
port = recipient.getPort();
}
}
DatagramPacket newDatagramPacket(ByteBuf buffer, InetSocketAddress localAddress) throws UnknownHostException {
final InetAddress address;
if (addrLen == ipv4Bytes.length) {
System.arraycopy(addr, 0, ipv4Bytes, 0, addrLen);
address = InetAddress.getByAddress(ipv4Bytes);
} else {
address = Inet6Address.getByAddress(null, addr, scopeId);
}
return new DatagramPacket(buffer.writerIndex(count),
localAddress, new InetSocketAddress(address, port));
}
}
}
