forked from cory/tildefriends
152 lines
5.0 KiB
C
152 lines
5.0 KiB
C
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/*
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* Copyright 2022-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/*
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* Contains definitions for simplifying the use of TCP Fast Open
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* (RFC7413) in OpenSSL socket BIOs.
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*/
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/* If a supported OS is added here, update test/bio_tfo_test.c */
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#if defined(TCP_FASTOPEN) && !defined(OPENSSL_NO_TFO)
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# if defined(OPENSSL_SYS_MACOSX) || defined(__FreeBSD__)
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# include <sys/sysctl.h>
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# endif
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/*
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* OSSL_TFO_SYSCTL is used to determine if TFO is supported by
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* this kernel, and if supported, if it is enabled. This is more of
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* a problem on FreeBSD 10.3 ~ 11.4, where TCP_FASTOPEN was defined,
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* but not enabled by default in the kernel, and only for the server.
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* Linux does not have sysctlbyname(), and the closest equivalent
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* is to go into the /proc filesystem, but I'm not sure it's
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* worthwhile.
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*
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* On MacOS and Linux:
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* These operating systems use a single parameter to control TFO.
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* The OSSL_TFO_CLIENT_FLAG and OSSL_TFO_SERVER_FLAGS are used to
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* determine if TFO is enabled for the client and server respectively.
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*
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* OSSL_TFO_CLIENT_FLAG = 1 = client TFO enabled
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* OSSL_TFO_SERVER_FLAG = 2 = server TFO enabled
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*
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* Such that:
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* 0 = TFO disabled
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* 3 = server and client TFO enabled
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*
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* macOS 10.14 and later support TFO.
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* Linux kernel 3.6 added support for client TFO.
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* Linux kernel 3.7 added support for server TFO.
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* Linux kernel 3.13 enabled TFO by default.
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* Linux kernel 4.11 added the TCP_FASTOPEN_CONNECT option.
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*
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* On FreeBSD:
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* FreeBSD 10.3 ~ 11.4 uses a single sysctl for server enable.
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* FreeBSD 12.0 and later uses separate sysctls for server and
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* client enable.
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*
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* Some options are purposely NOT defined per-platform
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*
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* OSSL_TFO_SYSCTL
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* Defined as a sysctlbyname() option to determine if
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* TFO is enabled in the kernel (macOS, FreeBSD)
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*
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* OSSL_TFO_SERVER_SOCKOPT
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* Defined to indicate the socket option used to enable
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* TFO on a server socket (all)
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*
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* OSSL_TFO_SERVER_SOCKOPT_VALUE
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* Value to be used with OSSL_TFO_SERVER_SOCKOPT
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*
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* OSSL_TFO_CONNECTX
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* Use the connectx() function to make a client connection
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* (macOS)
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*
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* OSSL_TFO_CLIENT_SOCKOPT
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* Defined to indicate the socket option used to enable
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* TFO on a client socket (FreeBSD, Linux 4.14 and later)
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*
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* OSSL_TFO_SENDTO
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* Defined to indicate the sendto() message type to
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* be used to initiate a TFO connection (FreeBSD,
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* Linux pre-4.14)
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*
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* OSSL_TFO_DO_NOT_CONNECT
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* Defined to skip calling connect() when creating a
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* client socket (macOS, FreeBSD, Linux pre-4.14)
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*/
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# if defined(OPENSSL_SYS_WINDOWS)
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/*
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* NO WINDOWS SUPPORT
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*
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* But this is what would be used on the server:
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*
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* define OSSL_TFO_SERVER_SOCKOPT TCP_FASTOPEN
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* define OSSL_TFO_SERVER_SOCKOPT_VALUE 1
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*
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* Still have to figure out client support
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*/
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# undef TCP_FASTOPEN
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# endif
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/* NO VMS SUPPORT */
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# if defined(OPENSSL_SYS_VMS)
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# undef TCP_FASTOPEN
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# endif
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# if defined(OPENSSL_SYS_MACOSX)
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# define OSSL_TFO_SYSCTL "net.inet.tcp.fastopen"
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# define OSSL_TFO_SERVER_SOCKOPT TCP_FASTOPEN
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# define OSSL_TFO_SERVER_SOCKOPT_VALUE 1
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# define OSSL_TFO_CONNECTX 1
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# define OSSL_TFO_DO_NOT_CONNECT 1
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# define OSSL_TFO_CLIENT_FLAG 1
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# define OSSL_TFO_SERVER_FLAG 2
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# endif
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# if defined(__FreeBSD__)
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# if defined(TCP_FASTOPEN_PSK_LEN)
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/* As of 12.0 these are the SYSCTLs */
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# define OSSL_TFO_SYSCTL_SERVER "net.inet.tcp.fastopen.server_enable"
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# define OSSL_TFO_SYSCTL_CLIENT "net.inet.tcp.fastopen.client_enable"
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# define OSSL_TFO_SERVER_SOCKOPT TCP_FASTOPEN
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# define OSSL_TFO_SERVER_SOCKOPT_VALUE MAX_LISTEN
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# define OSSL_TFO_CLIENT_SOCKOPT TCP_FASTOPEN
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# define OSSL_TFO_DO_NOT_CONNECT 1
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# define OSSL_TFO_SENDTO 0
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/* These are the same because the sysctl are client/server-specific */
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# define OSSL_TFO_CLIENT_FLAG 1
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# define OSSL_TFO_SERVER_FLAG 1
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# else
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/* 10.3 through 11.4 SYSCTL - ONLY SERVER SUPPORT */
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# define OSSL_TFO_SYSCTL "net.inet.tcp.fastopen.enabled"
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# define OSSL_TFO_SERVER_SOCKOPT TCP_FASTOPEN
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# define OSSL_TFO_SERVER_SOCKOPT_VALUE MAX_LISTEN
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# define OSSL_TFO_SERVER_FLAG 1
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# endif
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# endif
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# if defined(OPENSSL_SYS_LINUX)
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/* OSSL_TFO_PROC not used, but of interest */
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# define OSSL_TFO_PROC "/proc/sys/net/ipv4/tcp_fastopen"
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# define OSSL_TFO_SERVER_SOCKOPT TCP_FASTOPEN
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# define OSSL_TFO_SERVER_SOCKOPT_VALUE MAX_LISTEN
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# if defined(TCP_FASTOPEN_CONNECT)
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# define OSSL_TFO_CLIENT_SOCKOPT TCP_FASTOPEN_CONNECT
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# else
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# define OSSL_TFO_SENDTO MSG_FASTOPEN
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# define OSSL_TFO_DO_NOT_CONNECT 1
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# endif
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# define OSSL_TFO_CLIENT_FLAG 1
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# define OSSL_TFO_SERVER_FLAG 2
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# endif
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#endif
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