2018-02-23 09:53:12 +01:00
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Copyright (C) 2016-2018 Internet Systems Consortium, Inc. ("ISC")
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2016-08-12 15:31:33 +10:00
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This Source Code Form is subject to the terms of the Mozilla Public
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License, v. 2.0. If a copy of the MPL was not distributed with this
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file, You can obtain one at http://mozilla.org/MPL/2.0/.
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2018-02-23 09:53:12 +01:00
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See the COPYRIGHT file distributed with this work for additional
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information regarding copyright ownership.
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2016-08-12 15:31:33 +10:00
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Some systems (Linux, FreeBSD, OS X/macOS and Windows 10) support
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the TCP Fast Open (RFC 7413) mechanism in their recent versions.
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BIND 9 supports this on the server side.
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When the TCP_FASTOPEN socket option is defined after the listen()
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system call the socket code in the libisc set the option with
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the half of the listen backlog (so the fast open maximum queue length
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is the half of the pending connection queue length).
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Any failure is logged and ignored.
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System specific notes:
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- FreeBSD doesn't interpret the argument as a queue length but
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only as an on/off switch.
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2017-09-18 08:34:41 +02:00
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- Using TCP Fast Open on FreeBSD, as of versions 10.3 and 11.0, requires
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compiling a custom kernel and setting the "net.inet.tcp.fastopen.enabled"
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sysctl to 1.
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2016-08-12 15:31:33 +10:00
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- Apple OS X/macOS allows only 0 or 1 so the code puts 1 for this system.
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2016-08-15 19:43:20 +02:00
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- Windows 10 uses a 0/1 char flag? Note that TCP_FASTOPEN is defined
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only in SDK 10.0.14393.0 or higher (Visual Studio 2015 requires
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extra setting of the "Target Platform Version" in all project
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properties).
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2016-08-12 15:31:33 +10:00
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- the only other system known to support this is Linux.
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