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Added IP_TRANSPARENT option for UDP (#7872)

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Motivation:

This allows netty to operate in 'transparent proxy' mode for UDP, intercepting connections
to other addresses by means of Linux firewalling rules, as per

https://www.kernel.org/doc/Documentation/networking/tproxy.txt


Modification:

Add IP_TRANSPARENT option.

Result:

Allows setting and getting of the IP_TRANSPARENT option, which allows retrieval of the ultimate socket address originally requested.
This commit is contained in:
Devrim Şahin 2018-04-17 10:07:02 +03:00 committed by Norman Maurer
parent a4146b706c
commit 0b690a991f
1 changed files with 33 additions and 1 deletions
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34
transport-native-epoll/src/main/java/io/netty/channel/epoll/EpollDatagramChannelConfig.java
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@ -23,6 +23,7 @@ import io.netty.channel.MessageSizeEstimator;
import io.netty.channel.RecvByteBufAllocator;
import io.netty.channel.WriteBufferWaterMark;
import io.netty.channel.socket.DatagramChannelConfig;
import java.io.IOException;
import java.net.InetAddress;
import java.net.NetworkInterface;
@ -48,7 +49,7 @@ public final class EpollDatagramChannelConfig extends EpollChannelConfig impleme
ChannelOption.SO_REUSEADDR, ChannelOption.IP_MULTICAST_LOOP_DISABLED,
ChannelOption.IP_MULTICAST_ADDR, ChannelOption.IP_MULTICAST_IF, ChannelOption.IP_MULTICAST_TTL,
ChannelOption.IP_TOS, ChannelOption.DATAGRAM_CHANNEL_ACTIVE_ON_REGISTRATION,
EpollChannelOption.SO_REUSEPORT);
EpollChannelOption.SO_REUSEPORT, EpollChannelOption.IP_TRANSPARENT);
}
@SuppressWarnings({ "unchecked", "deprecation" })
@ -87,6 +88,9 @@ public final class EpollDatagramChannelConfig extends EpollChannelConfig impleme
if (option == EpollChannelOption.SO_REUSEPORT) {
return (T) Boolean.valueOf(isReusePort());
}
if (option == EpollChannelOption.IP_TRANSPARENT) {
return (T) Boolean.valueOf(isIpTransparent());
}
return super.getOption(option);
}
@ -117,6 +121,8 @@ public final class EpollDatagramChannelConfig extends EpollChannelConfig impleme
setActiveOnOpen((Boolean) value);
} else if (option == EpollChannelOption.SO_REUSEPORT) {
setReusePort((Boolean) value);
} else if (option == EpollChannelOption.IP_TRANSPARENT) {
setIpTransparent((Boolean) value);
} else {
return super.setOption(option, value);
}
@ -371,4 +377,30 @@ public final class EpollDatagramChannelConfig extends EpollChannelConfig impleme
throw new ChannelException(e);
}
}
/**
* Returns {@code true} if <a href="http://man7.org/linux/man-pages/man7/ip.7.html">IP_TRANSPARENT</a> is enabled,
* {@code false} otherwise.
*/
public boolean isIpTransparent() {
try {
return datagramChannel.socket.isIpTransparent();
} catch (IOException e) {
throw new ChannelException(e);
}
}
/**
* If {@code true} is used <a href="http://man7.org/linux/man-pages/man7/ip.7.html">IP_TRANSPARENT</a> is enabled,
* {@code false} for disable it. Default is disabled.
*/
public EpollDatagramChannelConfig setIpTransparent(boolean ipTransparent) {
try {
datagramChannel.socket.setIpTransparent(ipTransparent);
return this;
} catch (IOException e) {
throw new ChannelException(e);
}
}
}