iproute2/configure
Stefan Mätje 0ddadc93e5 configure: provide surrogates for possibly missing libbpf_version.h
Old libbpf library versions (< 0.7.x) may not have the libbpf_version.h
header packaged. This header would provide LIBBPF_MAJOR_VERSION and
LIBBPF_MINOR_VERSION which are then missing to control conditional
compilation in some source files.

Provide surrogates for these defines via CFLAGS that are derived from
the LIBBPF_VERSION determined with $(${PKG_CONFIG} libbpf --modversion).

Signed-off-by: Stefan Mätje <stefan.maetje@esd.eu>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
2024-08-15 08:24:37 -07:00

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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# This is not an autoconf generated configure
INCLUDE="$PWD/include"
PREFIX="/usr"
LIBDIR="\${prefix}/lib"
COLOR="never"
# Output file which is input to Makefile
CONFIG=config.mk
# Make a temp directory in build tree.
TMPDIR=$(mktemp -d config.XXXXXX)
trap 'status=$?; rm -rf $TMPDIR; exit $status' EXIT HUP INT QUIT TERM
check_toolchain()
{
: ${PKG_CONFIG:=pkg-config}
: ${AR=ar}
: ${CC=gcc}
: ${YACC=bison}
echo "PKG_CONFIG:=${PKG_CONFIG}" >>$CONFIG
echo "AR:=${AR}" >>$CONFIG
echo "CC:=${CC}" >>$CONFIG
echo "YACC:=${YACC}" >>$CONFIG
}
check_xtables()
{
if ! ${PKG_CONFIG} xtables --exists; then
echo "TC_CONFIG_NO_XT:=y" >>$CONFIG
fi
}
check_xt()
{
#check if we have xtables from iptables >= 1.4.5.
cat >$TMPDIR/ipttest.c <<EOF
#include <xtables.h>
#include <linux/netfilter.h>
static struct xtables_globals test_globals = {
.option_offset = 0,
.program_name = "tc-ipt",
.program_version = XTABLES_VERSION,
.orig_opts = NULL,
.opts = NULL,
.exit_err = NULL,
};
int main(int argc, char **argv)
{
xtables_init_all(&test_globals, NFPROTO_IPV4);
return 0;
}
EOF
if $CC -I$INCLUDE $IPTC -o $TMPDIR/ipttest $TMPDIR/ipttest.c $IPTL \
$(${PKG_CONFIG} xtables --cflags --libs) -ldl >/dev/null 2>&1; then
echo "TC_CONFIG_XT:=y" >>$CONFIG
echo "using xtables"
fi
rm -f $TMPDIR/ipttest.c $TMPDIR/ipttest
}
check_xt_old()
{
# bail if previous XT checks has already succeeded.
grep -q TC_CONFIG_XT $CONFIG && return
#check if we don't need our internal header ..
cat >$TMPDIR/ipttest.c <<EOF
#include <xtables.h>
char *lib_dir;
unsigned int global_option_offset = 0;
const char *program_version = XTABLES_VERSION;
const char *program_name = "tc-ipt";
struct afinfo afinfo = {
.libprefix = "libxt_",
};
void exit_error(enum exittype status, const char *msg, ...)
{
}
int main(int argc, char **argv) {
return 0;
}
EOF
if $CC -I$INCLUDE $IPTC -o $TMPDIR/ipttest $TMPDIR/ipttest.c $IPTL -ldl >/dev/null 2>&1; then
echo "TC_CONFIG_XT_OLD:=y" >>$CONFIG
echo "using old xtables (no need for xt-internal.h)"
fi
rm -f $TMPDIR/ipttest.c $TMPDIR/ipttest
}
check_xt_old_internal_h()
{
# bail if previous XT checks has already succeeded.
grep -q TC_CONFIG_XT $CONFIG && return
#check if we need our own internal.h
cat >$TMPDIR/ipttest.c <<EOF
#include <xtables.h>
#include "xt-internal.h"
char *lib_dir;
unsigned int global_option_offset = 0;
const char *program_version = XTABLES_VERSION;
const char *program_name = "tc-ipt";
struct afinfo afinfo = {
.libprefix = "libxt_",
};
void exit_error(enum exittype status, const char *msg, ...)
{
}
int main(int argc, char **argv) {
return 0;
}
EOF
if $CC -I$INCLUDE $IPTC -o $TMPDIR/ipttest $TMPDIR/ipttest.c $IPTL -ldl >/dev/null 2>&1; then
echo "using old xtables with xt-internal.h"
echo "TC_CONFIG_XT_OLD_H:=y" >>$CONFIG
fi
rm -f $TMPDIR/ipttest.c $TMPDIR/ipttest
}
check_lib_dir()
{
LIBDIR=$(echo $LIBDIR | sed "s|\${prefix}|$PREFIX|")
echo -n "lib directory: "
echo "$LIBDIR"
echo "LIBDIR:=$LIBDIR" >> $CONFIG
}
check_setns()
{
cat >$TMPDIR/setnstest.c <<EOF
#define _GNU_SOURCE
#include <sched.h>
int main(int argc, char **argv)
{
(void)setns(0,0);
return 0;
}
EOF
if $CC -I$INCLUDE -o $TMPDIR/setnstest $TMPDIR/setnstest.c >/dev/null 2>&1; then
echo "IP_CONFIG_SETNS:=y" >>$CONFIG
echo "yes"
echo "CFLAGS += -DHAVE_SETNS" >>$CONFIG
else
echo "no"
fi
rm -f $TMPDIR/setnstest.c $TMPDIR/setnstest
}
check_name_to_handle_at()
{
cat >$TMPDIR/name_to_handle_at_test.c <<EOF
#define _GNU_SOURCE
#include <sys/types.h>
#include <fcntl.h>
int main(int argc, char **argv)
{
struct file_handle *fhp;
int mount_id, flags, dirfd;
char *pathname;
name_to_handle_at(dirfd, pathname, fhp, &mount_id, flags);
return 0;
}
EOF
if $CC -I$INCLUDE -o $TMPDIR/name_to_handle_at_test $TMPDIR/name_to_handle_at_test.c >/dev/null 2>&1; then
echo "yes"
echo "CFLAGS += -DHAVE_HANDLE_AT" >>$CONFIG
else
echo "no"
fi
rm -f $TMPDIR/name_to_handle_at_test.c $TMPDIR/name_to_handle_at_test
}
check_ipset()
{
cat >$TMPDIR/ipsettest.c <<EOF
#include <linux/netfilter/ipset/ip_set.h>
#ifndef IP_SET_INVALID
#define IPSET_DIM_MAX 3
typedef unsigned short ip_set_id_t;
#endif
#include <linux/netfilter/xt_set.h>
struct xt_set_info info;
#if IPSET_PROTOCOL == 6 || IPSET_PROTOCOL == 7
int main(void)
{
return IPSET_MAXNAMELEN;
}
#else
#error unknown ipset version
#endif
EOF
if $CC -I$INCLUDE -o $TMPDIR/ipsettest $TMPDIR/ipsettest.c >/dev/null 2>&1; then
echo "TC_CONFIG_IPSET:=y" >>$CONFIG
echo "yes"
else
echo "no"
fi
rm -f $TMPDIR/ipsettest.c $TMPDIR/ipsettest
}
check_elf()
{
if ${PKG_CONFIG} libelf --exists; then
echo "HAVE_ELF:=y" >>$CONFIG
echo "yes"
echo 'CFLAGS += -DHAVE_ELF' "$(${PKG_CONFIG} libelf --cflags)" >> $CONFIG
echo 'LDLIBS += ' "$(${PKG_CONFIG} libelf --libs)" >>$CONFIG
else
echo "no"
fi
}
have_libbpf_basic()
{
cat >$TMPDIR/libbpf_test.c <<EOF
#include <bpf/libbpf.h>
int main(int argc, char **argv) {
bpf_program__set_autoload(NULL, false);
bpf_map__ifindex(NULL);
bpf_map__set_pin_path(NULL, NULL);
bpf_object__open_file(NULL, NULL);
return 0;
}
EOF
$CC -o $TMPDIR/libbpf_test $TMPDIR/libbpf_test.c $LIBBPF_CFLAGS $LIBBPF_LDLIBS >/dev/null 2>&1
local ret=$?
rm -f $TMPDIR/libbpf_test.c $TMPDIR/libbpf_test
return $ret
}
have_libbpf_sec_name()
{
cat >$TMPDIR/libbpf_sec_test.c <<EOF
#include <bpf/libbpf.h>
int main(int argc, char **argv) {
void *ptr;
bpf_program__section_name(NULL);
return 0;
}
EOF
$CC -o $TMPDIR/libbpf_sec_test $TMPDIR/libbpf_sec_test.c $LIBBPF_CFLAGS $LIBBPF_LDLIBS >/dev/null 2>&1
local ret=$?
rm -f $TMPDIR/libbpf_sec_test.c $TMPDIR/libbpf_sec_test
return $ret
}
check_force_libbpf_on()
{
# if set LIBBPF_FORCE=on but no libbpf support, just exist the config
# process to make sure we don't build without libbpf.
if [ "$LIBBPF_FORCE" = on ]; then
echo " LIBBPF_FORCE=on set, but couldn't find a usable libbpf"
exit 1
fi
}
check_libbpf()
{
# if set LIBBPF_FORCE=off, disable libbpf entirely
if [ "$LIBBPF_FORCE" = off ]; then
echo "no"
return
fi
if ! ${PKG_CONFIG} libbpf --exists && [ -z "$LIBBPF_DIR" ] ; then
echo "no"
check_force_libbpf_on
return
fi
if [ $(uname -m) = x86_64 ]; then
local LIBBPF_LIBDIR="${LIBBPF_DIR}/usr/lib64"
else
local LIBBPF_LIBDIR="${LIBBPF_DIR}/usr/lib"
fi
if [ -n "$LIBBPF_DIR" ]; then
LIBBPF_CFLAGS="-I${LIBBPF_DIR}/usr/include"
LIBBPF_LDLIBS="${LIBBPF_LIBDIR}/libbpf.a -lz -lelf"
LIBBPF_VERSION=$(PKG_CONFIG_LIBDIR=${LIBBPF_LIBDIR}/pkgconfig ${PKG_CONFIG} libbpf --modversion)
else
LIBBPF_CFLAGS=$(${PKG_CONFIG} libbpf --cflags)
LIBBPF_LDLIBS=$(${PKG_CONFIG} libbpf --libs)
LIBBPF_VERSION=$(${PKG_CONFIG} libbpf --modversion)
fi
if ! have_libbpf_basic; then
echo "no"
echo " libbpf version $LIBBPF_VERSION is too low, please update it to at least 0.1.0"
check_force_libbpf_on
return
else
echo "HAVE_LIBBPF:=y" >> $CONFIG
echo 'CFLAGS += -DHAVE_LIBBPF ' $LIBBPF_CFLAGS >> $CONFIG
echo "CFLAGS += -DLIBBPF_VERSION=\\\"$LIBBPF_VERSION\\\"" >> $CONFIG
LIBBPF_MAJOR=$(IFS="."; set $LIBBPF_VERSION; echo $1)
LIBBPF_MINOR=$(IFS="."; set $LIBBPF_VERSION; echo $2)
if [ "$LIBBPF_MAJOR" -eq 0 -a "$LIBBPF_MINOR" -lt 7 ]; then
# Newer libbpf versions provide these defines in the bpf/libbpf_version.h header.
echo "CFLAGS += -DLIBBPF_MAJOR_VERSION=$LIBBPF_MAJOR -DLIBBPF_MINOR_VERSION=$LIBBPF_MINOR" >> $CONFIG
fi
echo 'LDLIBS += ' $LIBBPF_LDLIBS >> $CONFIG
if [ -z "$LIBBPF_DIR" ]; then
echo "CFLAGS += -DLIBBPF_DYNAMIC" >> $CONFIG
fi
fi
# bpf_program__title() is deprecated since libbpf 0.2.0, use
# bpf_program__section_name() instead if we support
if have_libbpf_sec_name; then
echo "HAVE_LIBBPF_SECTION_NAME:=y" >> $CONFIG
echo 'CFLAGS += -DHAVE_LIBBPF_SECTION_NAME ' >> $CONFIG
fi
echo "yes"
echo " libbpf version $LIBBPF_VERSION"
}
check_selinux()
# SELinux is a compile time option in the ss utility
{
if ${PKG_CONFIG} libselinux --exists; then
echo "HAVE_SELINUX:=y" >>$CONFIG
echo "yes"
echo 'LDLIBS +=' "$(${PKG_CONFIG} --libs libselinux)" >>$CONFIG
echo 'CFLAGS += -DHAVE_SELINUX' "$(${PKG_CONFIG} --cflags libselinux)" >>$CONFIG
else
echo "no"
fi
}
check_tirpc()
{
if ${PKG_CONFIG} libtirpc --exists; then
echo "HAVE_RPC:=y" >>$CONFIG
echo "yes"
echo 'LDLIBS +=' "$(${PKG_CONFIG} --libs libtirpc)" >>$CONFIG
echo 'CFLAGS += -DHAVE_RPC' "$(${PKG_CONFIG} --cflags libtirpc)" >>$CONFIG
else
echo "no"
fi
}
check_mnl()
{
if ${PKG_CONFIG} libmnl --exists; then
echo "HAVE_MNL:=y" >>$CONFIG
echo "yes"
echo 'CFLAGS += -DHAVE_LIBMNL' "$(${PKG_CONFIG} libmnl --cflags)" >>$CONFIG
echo 'LDLIBS +=' "$(${PKG_CONFIG} libmnl --libs)" >> $CONFIG
else
echo "no"
fi
}
check_berkeley_db()
{
cat >$TMPDIR/dbtest.c <<EOF
#include <fcntl.h>
#include <stdlib.h>
#include <db_185.h>
int main(int argc, char **argv) {
dbopen("/tmp/xxx_test_db.db", O_CREAT|O_RDWR, 0644, DB_HASH, NULL);
return 0;
}
EOF
if $CC -I$INCLUDE -o $TMPDIR/dbtest $TMPDIR/dbtest.c -ldb >/dev/null 2>&1; then
echo "HAVE_BERKELEY_DB:=y" >>$CONFIG
echo "yes"
else
echo "no"
fi
rm -f $TMPDIR/dbtest.c $TMPDIR/dbtest
}
check_strlcpy()
{
cat >$TMPDIR/strtest.c <<EOF
#define _GNU_SOURCE
#include <string.h>
int main(int argc, char **argv) {
char dst[10];
strlcpy(dst, "test", sizeof(dst));
return 0;
}
EOF
if $CC -I$INCLUDE -o $TMPDIR/strtest $TMPDIR/strtest.c >/dev/null 2>&1; then
echo "no"
else
if ${PKG_CONFIG} libbsd --exists; then
echo 'CFLAGS += -DHAVE_LIBBSD' "$(${PKG_CONFIG} libbsd --cflags)" >>$CONFIG
echo 'LDLIBS +=' "$(${PKG_CONFIG} libbsd --libs)" >> $CONFIG
echo "no"
else
echo 'CFLAGS += -DNEED_STRLCPY' >>$CONFIG
echo "yes"
fi
fi
rm -f $TMPDIR/strtest.c $TMPDIR/strtest
}
check_cap()
{
if ${PKG_CONFIG} libcap --exists; then
echo "HAVE_CAP:=y" >>$CONFIG
echo "yes"
echo 'CFLAGS += -DHAVE_LIBCAP' "$(${PKG_CONFIG} libcap --cflags)" >>$CONFIG
echo 'LDLIBS +=' "$(${PKG_CONFIG} libcap --libs)" >> $CONFIG
else
echo "no"
fi
}
check_color()
{
case "$COLOR" in
never)
echo 'CONF_COLOR:=COLOR_OPT_NEVER' >> $CONFIG
echo 'never'
;;
auto)
echo 'CONF_COLOR:=COLOR_OPT_AUTO' >> $CONFIG
echo 'auto'
;;
always)
echo 'CONF_COLOR:=COLOR_OPT_ALWAYS' >> $CONFIG
echo 'always'
;;
esac
}
quiet_config()
{
cat <<EOF
# user can control verbosity similar to kernel builds (e.g., V=1)
ifeq ("\$(origin V)", "command line")
VERBOSE = \$(V)
endif
ifndef VERBOSE
VERBOSE = 0
endif
ifeq (\$(VERBOSE),1)
Q =
else
Q = @
endif
ifeq (\$(VERBOSE), 0)
QUIET_CC = @echo ' CC '\$@;
QUIET_AR = @echo ' AR '\$@;
QUIET_LINK = @echo ' LINK '\$@;
QUIET_YACC = @echo ' YACC '\$@;
QUIET_LEX = @echo ' LEX '\$@;
endif
EOF
}
usage()
{
cat <<EOF
Usage: $0 [OPTIONS]
--color <never|auto|always> Default color output configuration. Available options:
never: color output is disabled (default)
auto: color output is enabled if stdout is a terminal
always: color output is enabled regardless of stdout state
--include_dir <dir> Path to iproute2 include dir
--libdir <dir> Path to iproute2 lib dir
--libbpf_dir <dir> Path to libbpf DESTDIR
--libbpf_force <on|off> Enable/disable libbpf by force. Available options:
on: require link against libbpf, quit config if no libbpf support
off: disable libbpf probing
--prefix <dir> Path prefix of the lib files to install
-h | --help Show this usage info
EOF
exit $1
}
# Compat with the old INCLUDE path setting method.
if [ $# -eq 1 ] && [ "$(echo $1 | cut -c 1)" != '-' ]; then
INCLUDE="$1"
else
while [ "$#" -gt 0 ]; do
case "$1" in
--color)
shift
COLOR="$1" ;;
--color=*)
COLOR="${1#*=}" ;;
--include_dir)
shift
INCLUDE="$1" ;;
--include_dir=*)
INCLUDE="${1#*=}" ;;
--libdir)
shift
LIBDIR="$1" ;;
--libdir=*)
LIBDIR="${1#*=}" ;;
--libbpf_dir)
shift
LIBBPF_DIR="$1" ;;
--libbpf_dir=*)
LIBBPF_DIR="${1#*=}" ;;
--libbpf_force)
shift
LIBBPF_FORCE="$1" ;;
--libbpf_force=*)
LIBBPF_FORCE="${1#*=}" ;;
--prefix)
shift
PREFIX="$1" ;;
--prefix=*)
PREFIX="${1#*=}" ;;
-h | --help)
usage 0 ;;
--*)
;;
*)
usage 1 ;;
esac
[ "$#" -gt 0 ] && shift
done
fi
case "$COLOR" in
never) ;;
auto) ;;
always) ;;
*) usage 1 ;;
esac
[ -d "$INCLUDE" ] || usage 1
if [ "${LIBBPF_DIR-unused}" != "unused" ]; then
[ -d "$LIBBPF_DIR" ] || usage 1
fi
if [ "${LIBBPF_FORCE-unused}" != "unused" ]; then
if [ "$LIBBPF_FORCE" != 'on' ] && [ "$LIBBPF_FORCE" != 'off' ]; then
usage 1
fi
fi
[ -z "$PREFIX" ] && usage 1
[ -z "$LIBDIR" ] && usage 1
echo "# Generated config based on" $INCLUDE >$CONFIG
quiet_config >> $CONFIG
check_toolchain
echo "TC schedulers"
check_xtables
if ! grep -q TC_CONFIG_NO_XT $CONFIG; then
echo -n " IPT "
check_xt
check_xt_old
check_xt_old_internal_h
echo -n " IPSET "
check_ipset
fi
echo
check_lib_dir
echo -n "libc has setns: "
check_setns
echo -n "libc has name_to_handle_at: "
check_name_to_handle_at
echo -n "SELinux support: "
check_selinux
echo -n "libtirpc support: "
check_tirpc
echo -n "libbpf support: "
check_libbpf
echo -n "ELF support: "
check_elf
echo -n "libmnl support: "
check_mnl
echo -n "Berkeley DB: "
check_berkeley_db
echo -n "need for strlcpy: "
check_strlcpy
echo -n "libcap support: "
check_cap
echo -n "color output: "
check_color
echo >> $CONFIG
echo "%.o: %.c" >> $CONFIG
echo ' $(QUIET_CC)$(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CPPFLAGS) -c -o $@ $<' >> $CONFIG