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3f69070598
Multipath TCP (MPTCP), standardized in RFC8684 [1], is a TCP extension that enables a TCP connection to use different paths. It allows a device to make use of multiple interfaces at once to send and receive TCP packets over a single MPTCP connection. MPTCP can aggregate the bandwidth of multiple interfaces or prefer the one with the lowest latency, it also allows a fail-over if one path is down, and the traffic is seamlessly re-injected on other paths. To benefit from MPTCP, both the client and the server have to support it. Multipath TCP is a backward-compatible TCP extension that is enabled by default on recent Linux distributions (Debian, Ubuntu, Redhat, ...). Multipath TCP is included in the Linux kernel since version 5.6 [2]. To use it on Linux, an application must explicitly enable it when creating the socket: int sd = socket(AF_INET(6), SOCK_STREAM, IPPROTO_MPTCP); No need to change anything else in the application. This patch allows MPTCP protocol in the Socket unit configuration. So now, a <unit>.socket can contain this to use MPTCP instead of TCP: [Socket] SocketProtocol=mptcp MPTCP support has been allowed similarly to what has been already done to allow SCTP: just one line in core/socket.c, a very simple addition thanks to the flexible architecture already in place. On top of that, IPPROTO_MPTCP has also been added in the list of allowed protocols in two other places, and in the doc. It has also been added to the missing_network.h file, for systems with an old libc -- note that it was also required to include <netinet/in.h> in this file to avoid redefinition errors. Link: https://www.rfc-editor.org/rfc/rfc8684.html [1] Link: https://www.mptcp.dev [2]
119 lines
2.6 KiB
SYSTEMD
119 lines
2.6 KiB
SYSTEMD
socket
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# SPDX-License-Identifier: LGPL-2.1-or-later
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#
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# This file is part of systemd.
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#
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# systemd is free software; you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 of the License, or
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# (at your option) any later version.
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[Unit]
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Description=Syslog Socket
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Documentation=man:systemd.special(7)
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Documentation=https://systemd.io/SYSLOG
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DefaultDependencies=no
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Before=sockets.target
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# Don't allow logging until the very end
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Conflicts=shutdown.target
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Before=shutdown.target
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# Don't try to activate syslog.service if sysinit.target has failed.
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Conflicts=emergency.service
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Before=emergency.service
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[Socket]
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ListenDatagram=/run/systemd/journal/syslog
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SocketMode=0666
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PassCredentials=yes
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PassSecurity=yes
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ReceiveBuffer=8M
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# The default syslog implementation should make syslog.service a
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# symlink to itself, so that this socket activates the right actual
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# syslog service.
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#
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# Examples:
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#
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# /etc/systemd/system/syslog.service -> /lib/systemd/system/rsyslog.service
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# /etc/systemd/system/syslog.service -> /lib/systemd/system/syslog-ng.service
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#
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# Best way to achieve that is by adding this to your unit file
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# (i.e. to rsyslog.service or syslog-ng.service):
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#
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# [Install]
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# Alias=syslog.service
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#
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# See https://systemd.io/SYSLOG for details.
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[Socket]
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ListenStream=1.2.3.4:1234
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ListenDatagram=1.2.3.4:1234
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ListenSequentialPacket=1.2.3.4:1234
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ListenFIFO=
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ListenSpecial=
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#ListenNetlink=
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ListenMessageQueue=
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ListenUSBFunction=
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SocketProtocol=udplite
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SocketProtocol=sctp
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SocketProtocol=mptcp
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SocketProtocol=
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BindIPv6Only=false
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Backlog=33
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BindToDevice=eth0
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SocketUser=daemon
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SocketGroup=nobody
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SocketMode=0111
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DirectoryMode=0555
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Accept=true
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Accept=false
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Writable=true
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MaxConnections=11
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MaxConnectionsPerSource=12
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KeepAlive=yes
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KeepAliveTimeSec=12345
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KeepAliveIntervalSec=12345
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KeepAliveProbes=12345
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NoDelay=true
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Priority=0
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DeferAcceptSec=1
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ReceiveBuffer=1G
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SendBuffer=1G
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IPTOS=low-delay
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IPTOS=throughput
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IPTOS=reliability
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IPTOS=low-cost
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IPTOS=
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IPTTL=7
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Mark=123
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ReusePort=true
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SmackLabel=smack-label
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SmackLabelIPIn=smack-label
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SmackLabelIPOut=no idea what to put here
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SELinuxContextFromNet=true
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PipeSize=11111
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MessageQueueMaxMessages=200
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MessageQueueMessageSize=200
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FreeBind=false
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Transparent=true
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Broadcast=true
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PassCredentials=true
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PassSecurity=true
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TCPCongestion=westwood
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TCPCongestion=veno
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TCPCongestion=cubic
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TCPCongestion=lp
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ExecStartPre=/bin/true "arg ' ' "
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ExecStartPost=-!!/bin/false
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ExecStopPre=/bin/true
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ExecStopPost=-!!/bin/false
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TimeoutSec=2343
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Symlinks=a b c d e
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Symlinks=
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Symlinks=/a /b /c /d /e
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FileDescriptorName=name
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TriggerLimitIntervalSec=2343
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TriggerLimitBurst=234
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