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README.kernel_versions
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README.kernel_versions
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keepalived used kernel features that have been introduced over time,
but in order to still allow keepalived to be built and run on older
kernel versions it has many checks of what kernel features are available.
Set out below in chronological order are the features that have been added
to Linux that keepalived makes use of if they are available.
If in doubt about features, grep the source tree searching for "Linux". The
source (including configure.ac) attempts to document which kernel version
introduced features that are used conditionally.
At the end of this file is a list of kernel configure options that affect
functionality that keepalived uses.
=============================================================================
dnl -- From glibc 2.14. Otherwise use setns syscall, since Linux 2.4.x
AC_CHECK_FUNCS([setns])
IPV6_RECVHOPLIMIT & IPV6_RECVPKTINFO Since Linux 2.6.14
./keepalived/core/namespaces.c:#ifndef MS_SLAVE /* Since glibc 2.12, but Linux since 2.6.15 */
./keepalived/core/namespaces.c:#ifdef MS_SLAVE /* Since Linux 2.6.15. Prior to that mounts weren't shared */
dnl -- linux/netfilter/x_tables.h since Linux 2.6.16
dnl ----[ Checks for FIB routing support ]----
# Introduced in Linux 2.6.19
./keepalived/vrrp/vrrp_ipaddress.c:#ifdef IFA_F_NODAD /* Since Linux 2.6.19 */
./keepalived/vrrp/vrrp_ipaddress.c:#ifdef IFA_F_HOMEADDRESS /* Linux 2.6.19 */
dnl - signalfd() since Linux 2.6.22 and glibc 2.8
AC_CHECK_FUNCS([signalfd], [add_system_opt([SIGNALFD])])
./keepalived/check/ipvswrapper.c:#ifndef O_CLOEXEC /* Since Linux 2.6.23 and glibc 2.7 */
dnl -- RLIMIT_RTTIME since Linux 2.6.25 - not supported with musl libc
./lib/signals.c:#ifdef SFD_NONBLOCK /* From Linux 2.6.26 */
./lib/scheduler.c:#ifdef TFD_NONBLOCK /* Since Linux 2.6.27 */
dnl - pipe2() since Linux 2.6.27 and glibc 2.9.
AC_CHECK_FUNCS([pipe2], [add_system_opt([PIPE2])])
dnl - inotify_init1() since Linux 2.6.27
AC_CHECK_FUNCS([inotify_init1], [add_system_opt([INOTIFY_INIT1])])
dnl -- <linux/ip_vs.h> exists from Linux 2.6.27; prior to that <net/ip_vs.h> is used
dnl - epoll_create1() since Linux 2.6.27 and glibc 2.9
AC_CHECK_FUNCS([epoll_create1], [add_system_opt([EPOLL_CREATE1])])
dnl ----[ Checks for glibc SOCK_NONBLOCK support ]----
# Introduced in Linux 2.6.27 and glibc 2.9
AM_CONDITIONAL([SOCK_NONBLOCK], [test $ac_cv_have_decl_SOCK_NONBLOCK = yes])
dnl ----[ Checks for glibc SOCK_CLOEXEC support ]----
# Introduced in Linux 2.6.27 and glibc 2.9
AC_CHECK_DECLS([SOCK_CLOEXEC], [add_system_opt([SOCK_CLOEXEC])], [],[[#include <sys/socket.h>]])
./keepalived/core/keepalived_netlink.c: * NETLINK_NO_ENOBUFS was introduced in Linux 2.6.30
dnl - Introduced in Linux 2.6.31
AC_CHECK_DECLS([IP_MULTICAST_ALL], [], [], [[#include <linux/in.h>]])
./keepalived/include/vrrp_if.h:#if HAVE_DECL_IP_MULTICAST_ALL /* Since Linux 2.6.31 */
./keepalived/vrrp/vrrp_if.c:#if HAVE_DECL_IP_MULTICAST_ALL /* Since Linux 2.6.31 */
./keepalived/vrrp/vrrp.c:#if HAVE_DECL_IP_MULTICAST_ALL /* Since Linux 2.6.31 */
./keepalived/vrrp/vrrp.c:#if HAVE_DECL_IP_MULTICAST_ALL /* Since Linux 2.6.31 */
dnl -- SCHED_RESET_ON_FORK since Linux 2.6.32
dnl -- From Linux 2.6.35 (but CentOS has it in 2.6.32)
AC_CHECK_DECLS([IP_VS_SVC_F_ONEPACKET], [], [],
dnl --FRA_OIFNAME dnl -- Linux 2.6.33
./keepalived/core/keepalived_netlink.c: * interface name until Linux v2.6.33 */
dnl -- Since Linux 2.6.33
IFLA_MACVLAN_MODE,
MACVLAN_MODE_PRIVATE], [],
dnl -- XT_EXTENSION_MAXNAMELEN not defined until Linux 2.6.35
dnl ----[ Checks for pe support ]----
# Introduced in Linux 2.6.37
AC_CHECK_DECL([IPVS_SVC_ATTR_PE_NAME],
dnl ----[ Checks for O_PATH support ]----
# Introduced in Linux 2.6.39
dnl -- xt_set_info_match first introduced in Linux 2.6.39 (initial implementation of ipsets)
dnl ---[ check for setns() ]----
dnl -- CLONE_NEWNET defined from Linux 3.0
dnl -- <linux/netlink.h> needed <sys/socket.h> until Linux 3.1
dnl -- <linux/rtnetlink.h> needed <sys/socket.h> until ? Linux 3.1
dnl -- using AC_CHECK_HEADER causes a horrible error message for the user
dnl -- xt_set_info_match_v1 declared since Linux 3.1
dnl - ipset type iface introduced in Linux 3.1
./keepalived/vrrp/vrrp_ipset.c: /* hash:net,iface was introduced in Linux 3.1 */
dnl -- Need to use <libipset/linux_ip_set.h> for <linux/netfilter/xt_set.h> prior to Linux 3.4
./keepalived/vrrp/vrrp_iptables_calls.c:#ifndef IP_SET_OP_VERSION /* Exposed to userspace from Linux 3.4 */
./lib/parser.c: The man page open(2) states that fchdir() didn't support O_PATH until Linux 3.5,
./lib/parser.c: even though testing on Linux 3.1 shows it appears to work. To be safe, don't
./lib/parser.c: use it until Linux 3.5. */
dnl -- xt_set_info_match_v3 declared since Linux 3.10
dnl ----[Check have IPV4_DEVCONF defines - since Linux 3.11]----
./keepalived/check/check_parser.c:#ifdef IP_VS_SVC_F_SCHED1 /* From Linux 3.11 */
dnl --RTAX_QUICKACK dnl -- Linux 3.11
dnl --FRA_SUPPRESS_PREFIXLEN dnl -- Linux 3.12
dnl --FRA_SUPPRESS_IFGROUP dnl -- Linux 3.12
./keepalived/include/global_data.h: bool namespace_with_ipsets; /* override for namespaces with ipsets on Linux < 3.13 */
./keepalived/vrrp/vrrp_iptables_calls.c:#if defined IP_SET_OP_GET_FNAME /* Since Linux 3.13 */
./keepalived/vrrp/vrrp_ipset.c: * than Linux 3.13, since ipsets didn't understand namespaces prior to that. */
dnl - Introduced in Linux 3.14
AC_CHECK_DECLS([IFA_FLAGS], [], [], [[#include <linux/if_addr.h>]])
./keepalived/vrrp/vrrp_ipaddress.c:#ifdef IFA_F_MANAGETEMPADDR /* Linux 3.14 */
./keepalived/vrrp/vrrp_ipaddress.c:#ifdef IFA_F_NOPREFIXROUTE /* Linux 3.14 */
./keepalived/vrrp/vrrp_ipaddress.c:#ifdef IFA_F_MANAGETEMPADDR /* Linux 3.14 */
./keepalived/vrrp/vrrp_ipaddress.c:#ifdef IFA_F_NOPREFIXROUTE /* Linux 3.14 */
dnl ----[ Checks for kernel IFLA_INET6_ADDR_GEN_MODE support ]----
# Introduced in Linux 3.17
dnl -- Since Linux 3.18
AC_CHECK_DECLS([IPVS_DEST_ATTR_ADDR_FAMILY], [add_system_opt([IPVS_DEST_ATTR_ADDR_FAMILY])], [], [#include <linux/ip_vs.h>])
dnl -- xt_set_info_match_v4 declared since Linux 3.19
./lib/rttables.c:#ifdef RTPROT_BABEL /* Since Linux 3.19 */
dnl --RTAX_CC_ALGO dnl -- Linux 4.0
./keepalived/vrrp/vrrp_ipaddress.c:#ifdef IFA_F_MCAUTOJOIN /* Linux 4.1 */
dnl -- Since Linux 4.1
IPVS_SVC_ATTR_STATS64,
IPVS_DEST_ATTR_STATS64], [],
dnl --RTA_VIA dnl -- Linux 4.1
dnl --RTA_NEWDST dnl -- Linux 4.1
dnl --RTA_PREF dnl -- Linux 4.1
./keepalived/include/ip_vs.h:/* Prior to Linux 4.2 have to include linux/in.h and linux/in6.h
./keepalived/include/vrrp_iproute.h:#if HAVE_DECL_RTA_ENCAP /* Since Linux 4.3 */
dnl -- Since Linux 4.3
AC_CHECK_DECLS([
IPVS_DAEMON_ATTR_SYNC_MAXLEN,
IPVS_DAEMON_ATTR_MCAST_GROUP,
IPVS_DAEMON_ATTR_MCAST_GROUP6,
IPVS_DAEMON_ATTR_MCAST_PORT,
IPVS_DAEMON_ATTR_MCAST_TTL], [],
dnl -- Since Linux 4.3
AC_DEFINE([_HAVE_IPVS_SYNCD_ATTRIBUTES_], [ 1 ], [Define to 1 if have IPVS syncd attributes])
dnl --FRA_TUN_ID dnl -- Linux 4.3
dnl --RTA_ENCAP dnl -- Linux 4.3
dnl ----[ Checks for kernel IFLA_VRF_... support ]----
# Introduced in Linux 4.3
dnl --RTEXT_FILTER_SKIP_STATS dnl -- Linux 4.4
dnl --RTA_EXPIRES dnl -- Linux 4.5
./keepalived/vrrp/vrrp_iptables.c:/* Linux 4.5 introduced a namespace collision when including
./keepalived/vrrp/vrrp_iptables_calls.c:/* Linux 4.5 introduced a namespace collision when including
# Linux 4.5 to 4.5.4 has <libiptc/libiptc.h> indirectly including <net/if.h>
# and <linux/if.h> which causes a namespace collision.
dnl --FRA_L3MDEV dnl -- Linux 4.8
dnl --FRA_UID_RANGE dnl -- Linux 4.10
./keepalived/core/main.c: * fs/coredump.c. Currently (Linux 4.10) defines it to be 128, but the
dnl --RTA_TTL_PROPAGATE dnl -- Linux 4.12
dnl --RTAX_FASTOPEN_NO_COOKIE dnl -- Linux 4.15
dnl --FRA_PROTOCOL dnl -- Linux 4.17
dnl --FRA_IP_PROTO dnl -- Linux 4.17
dnl --FRA_SPORT_RANGE dnl -- Linux 4.17
dnl --FRA_DPORT_RANGE dnl -- Linux 4.17
./lib/rbtree.c:/* This is updated to Linux v4.18.10 lib/rbtree.c
dnl -- Since Linux 5.2
IPVS_DEST_ATTR_TUN_TYPE
dnl -- Since Linux 5.3
IP_VS_TUNNEL_ENCAP_FLAG_NOCSUM
IP_VS_CONN_F_TUNNEL_TYPE_GRE
??? dnl -- RedHat backported ENCAP_IP and ENCAP_IP6 without MPLS and ILA
dnl ----[ Is HTTP_GET regex checking wanted? ]----
$PKG_CONFIG --exists libpcre2-8
=============================================================================
Kernel configuration requirements
---------------------------------
The following list is probably incomplete, and will be updated as other
options become known.
BPF
EPOLL
SIGNALFD
TIMERFD
SYSCTL
PROC_FS
INET
IP_MULTICAST
IPV6
IP_VS (unless --disable-lvs is specified)
IP_VS suboptions to match the real_server/virtual_server configuration
NETFILTER_XTABLES - if strict_mode or no_accept.
NETFILTER_XT options and IP_SET
IP_ADVANCED_ROUTER and various associated options if static/dynamic routes specified
FIB_RULES if static or dynamic rules are specified
NFTABLES