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272 lines
7.1 KiB
272 lines
7.1 KiB
5 months ago
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/*
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* include/haproxy/compat.h
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* Operating system compatibility interface.
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*
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* Copyright (C) 2000-2020 Willy Tarreau - w@1wt.eu
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, version 2.1
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* exclusively.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _HAPROXY_COMPAT_H
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#define _HAPROXY_COMPAT_H
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#include <limits.h>
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#include <signal.h>
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#include <time.h>
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#include <unistd.h>
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/* This is needed on Linux for Netfilter includes */
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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/* set any optional field in a struct to this type to save ifdefs. Its address
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* will still be valid but it will not reserve any room nor require any
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* initialization.
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*/
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typedef struct { } empty_t;
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// Redefine some limits that are not present everywhere
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#ifndef LLONG_MAX
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# define LLONG_MAX 9223372036854775807LL
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# define LLONG_MIN (-LLONG_MAX - 1LL)
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#endif
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#ifndef ULLONG_MAX
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# define ULLONG_MAX (LLONG_MAX * 2ULL + 1)
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#endif
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#ifndef LONGBITS
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#define LONGBITS ((unsigned int)sizeof(long) * 8)
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#endif
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#ifndef BITS_PER_INT
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#define BITS_PER_INT (8*sizeof(int))
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#endif
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#ifndef MIN
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#define MIN(a, b) (((a) < (b)) ? (a) : (b))
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#endif
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#ifndef MAX
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#define MAX(a, b) (((a) > (b)) ? (a) : (b))
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#endif
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/* this is for libc5 for example */
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#ifndef TCP_NODELAY
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#define TCP_NODELAY 1
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#endif
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#ifndef SHUT_RD
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#define SHUT_RD 0
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#endif
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#ifndef SHUT_WR
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#define SHUT_WR 1
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#endif
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/* only Linux defines it */
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#ifndef MSG_NOSIGNAL
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#define MSG_NOSIGNAL 0
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#endif
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/* AIX does not define MSG_DONTWAIT. We'll define it to zero, and test it
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* wherever appropriate.
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*/
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#ifndef MSG_DONTWAIT
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#define MSG_DONTWAIT 0
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#endif
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/* Only Linux defines MSG_MORE */
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#ifndef MSG_MORE
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#define MSG_MORE 0
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#endif
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/* On Linux 2.4 and above, MSG_TRUNC can be used on TCP sockets to drop any
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* pending data. Let's rely on NETFILTER to detect if this is supported.
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*/
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#ifdef USE_NETFILTER
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#define MSG_TRUNC_CLEARS_INPUT
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#endif
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/* Maximum path length, OS-dependant */
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#ifndef MAXPATHLEN
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#define MAXPATHLEN 128
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#endif
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/* longest UNIX socket name */
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#ifndef UNIX_MAX_PATH
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#define UNIX_MAX_PATH 108
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#endif
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/* On Linux, allows pipes to be resized */
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#ifndef F_SETPIPE_SZ
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#define F_SETPIPE_SZ (1024 + 7)
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#endif
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/* On FreeBSD we don't have SI_TKILL but SI_LWP instead */
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#if !defined(SI_TKILL) && defined(SI_LWP)
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#define SI_TKILL SI_LWP
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#endif
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/* systems without such defines do not know clockid_t or timer_t */
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#if !(_POSIX_TIMERS > 0)
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#undef clockid_t
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#define clockid_t empty_t
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#undef timer_t
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#define timer_t empty_t
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#endif
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/* define a dummy value to designate "no timer". Use only 32 bits. */
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#ifndef TIMER_INVALID
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#define TIMER_INVALID ((timer_t)(unsigned long)(0xfffffffful))
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#endif
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#if defined(USE_TPROXY) && defined(USE_NETFILTER)
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#include <linux/types.h>
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#include <linux/netfilter_ipv6.h>
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#include <linux/netfilter_ipv4.h>
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#endif
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/* On Linux, IP_TRANSPARENT and/or IP_FREEBIND generally require a kernel patch */
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#if defined(USE_LINUX_TPROXY)
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#if !defined(IP_FREEBIND)
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#define IP_FREEBIND 15
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#endif /* !IP_FREEBIND */
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#if !defined(IP_TRANSPARENT)
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#define IP_TRANSPARENT 19
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#endif /* !IP_TRANSPARENT */
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#if !defined(IPV6_TRANSPARENT)
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#define IPV6_TRANSPARENT 75
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#endif /* !IPV6_TRANSPARENT */
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#endif /* USE_LINUX_TPROXY */
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#if defined(IP_FREEBIND) \
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|| defined(IP_BINDANY) \
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|| defined(IPV6_BINDANY) \
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|| defined(SO_BINDANY) \
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|| defined(IP_TRANSPARENT) \
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|| defined(IPV6_TRANSPARENT)
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#define CONFIG_HAP_TRANSPARENT
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#endif
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/* We'll try to enable SO_REUSEPORT on Linux 2.4 and 2.6 if not defined.
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* There are two families of values depending on the architecture. Those
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* are at least valid on Linux 2.4 and 2.6, reason why we'll rely on the
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* USE_NETFILTER define.
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*/
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#if !defined(SO_REUSEPORT) && defined(USE_NETFILTER)
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#if (SO_REUSEADDR == 2)
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#define SO_REUSEPORT 15
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#elif (SO_REUSEADDR == 0x0004)
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#define SO_REUSEPORT 0x0200
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#endif /* SO_REUSEADDR */
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#endif /* SO_REUSEPORT */
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/* only Linux defines TCP_FASTOPEN */
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#ifdef USE_TFO
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#ifndef TCP_FASTOPEN
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#define TCP_FASTOPEN 23
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#endif
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#ifndef TCP_FASTOPEN_CONNECT
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#define TCP_FASTOPEN_CONNECT 30
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#endif
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#endif
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/* FreeBSD doesn't define SOL_IP and prefers IPPROTO_IP */
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#ifndef SOL_IP
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#define SOL_IP IPPROTO_IP
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#endif
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/* same for SOL_TCP */
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#ifndef SOL_TCP
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#define SOL_TCP IPPROTO_TCP
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#endif
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/* If IPv6 is supported, define IN6_IS_ADDR_V4MAPPED() if missing. */
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#if defined(IPV6_TCLASS) && !defined(IN6_IS_ADDR_V4MAPPED)
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#define IN6_IS_ADDR_V4MAPPED(a) \
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((((const uint32_t *) (a))[0] == 0) \
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&& (((const uint32_t *) (a))[1] == 0) \
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&& (((const uint32_t *) (a))[2] == htonl (0xffff)))
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#endif
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#if defined(__dietlibc__)
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#include <strings.h>
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#endif
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/* crypt_r() has been present in glibc since 2.2 and on FreeBSD since 12.0
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* (12000002). No other OS makes any mention of it for now. Feel free to add
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* valid known combinations below if needed to relax the crypt() lock when
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* using threads.
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*/
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#if (defined(__GNU_LIBRARY__) && (__GLIBC__ > 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ >= 2)) \
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|| (defined(__FreeBSD__) && __FreeBSD_version >= 1200002)
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#define HA_HAVE_CRYPT_R
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#endif
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/* some backtrace() implementations are broken or incomplete, in this case we
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* can replace them. We must not do it all the time as some are more accurate
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* than ours.
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*/
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#ifdef USE_BACKTRACE
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#if defined(__aarch64__)
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/* on aarch64 at least from gcc-4.7.4 to 7.4.1 we only get a single entry, which
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* is pointless. Ours works though it misses the faulty function itself,
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* probably due to an alternate stack for the signal handler which does not
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* create a new frame hence doesn't store the caller's return address.
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*/
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#elif defined(__clang__) && defined(__x86_64__)
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/* this is on FreeBSD, clang 4.0 to 8.0 produce don't go further than the
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* sighandler.
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*/
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#else
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#define HA_HAVE_WORKING_BACKTRACE
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#endif
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#endif
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/* malloc_trim() can be very convenient to reclaim unused memory especially
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* from huge pattern files. It's available (and really usable) in glibc 2.8 and
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* above.
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*/
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#if (defined(__GNU_LIBRARY__) && (__GLIBC__ > 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ >= 8))
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#include <malloc.h>
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#define HA_HAVE_MALLOC_TRIM
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#endif
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/* Max number of file descriptors we send in one sendmsg(). Linux seems to be
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* able to send 253 fds per sendmsg(), not sure about the other OSes.
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*/
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#define MAX_SEND_FD 253
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/* Make the new complex name for the xxhash function easier to remember
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* and use.
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*/
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#ifndef XXH3
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#define XXH3(data, len, seed) XXH3_64bits_withSeed(data, len, seed)
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#endif
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#endif /* _HAPROXY_COMPAT_H */
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/*
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* Local variables:
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* c-indent-level: 8
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* c-basic-offset: 8
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* End:
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*/
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