configure - pub/scm/network/iproute2/iproute2-next - Git at Google

 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # This is not an autoconf generated configure

 INCLUDE="$PWD/include"
 PREFIX="/usr"
 LIBDIR="\${prefix}/lib"

 # 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_atm()
 {
     cat >$TMPDIR/atmtest.c <<EOF
 #include <atm.h>
 int main(int argc, char **argv) {
 	struct atm_qos qos;
 	(void) text2qos("aal5,ubr:sdu=9180,rx:none",&qos,0);
 	return 0;
 }
 EOF

     if $CC -I$INCLUDE -o $TMPDIR/atmtest $TMPDIR/atmtest.c -latm >/dev/null 2>&1; then
 	echo "TC_CONFIG_ATM:=y" >>$CONFIG
 	echo yes
     else
 	echo no
     fi
     rm -f $TMPDIR/atmtest.c $TMPDIR/atmtest
 }

 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_ipt()
 {
 	if ! grep TC_CONFIG_XT $CONFIG > /dev/null; then
 		echo "using iptables"
 	fi
 }

 check_ipt_lib_dir()
 {
 	IPT_LIB_DIR=$(${PKG_CONFIG} --variable=xtlibdir xtables)
 	if [ -n "$IPT_LIB_DIR" ]; then
 		echo $IPT_LIB_DIR
 		echo "IPT_LIB_DIR:=$IPT_LIB_DIR" >> $CONFIG
 		return
 	fi

 	for dir in /lib /usr/lib /usr/local/lib; do
 		for file in "xtables" "iptables"; do
 			file="$dir/$file/lib*t_*so"
 			if [ -f $file ]; then
 				echo ${file%/*}
 				echo "IPT_LIB_DIR:=${file%/*}" >> $CONFIG
 				return
 			fi
 		done
 	done
 	echo "not found!"
 }

 check_setns()
 {
     cat >$TMPDIR/setnstest.c <<EOF
 #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 <sys/stat.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
         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_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
 #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
 }

 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]
 	--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
 			--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

 [ -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"

 echo -n " ATM	"
 check_atm

 check_xtables
 if ! grep -q TC_CONFIG_NO_XT $CONFIG; then
 	echo -n " IPT	"
 	check_xt
 	check_xt_old
 	check_xt_old_internal_h
 	check_ipt

 	echo -n " IPSET  "
 	check_ipset
 fi

 echo
 check_lib_dir
 if ! grep -q TC_CONFIG_NO_XT $CONFIG; then
 	echo -n "iptables modules directory: "
 	check_ipt_lib_dir
 fi

 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 "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 >> $CONFIG
 echo "%.o: %.c" >> $CONFIG
 echo '	$(QUIET_CC)$(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CPPFLAGS) -c -o $@ $<' >> $CONFIG
	#!/bin/sh
	# SPDX-License-Identifier: GPL-2.0
	# This is not an autoconf generated configure

	INCLUDE="$PWD/include"
	PREFIX="/usr"
	LIBDIR="\${prefix}/lib"

	# 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_atm()
	{
	cat >$TMPDIR/atmtest.c <<EOF
	#include <atm.h>
	int main(int argc, char **argv) {
	struct atm_qos qos;
	(void) text2qos("aal5,ubr:sdu=9180,rx:none",&qos,0);
	return 0;
	}
	EOF

	if $CC -I$INCLUDE -o $TMPDIR/atmtest $TMPDIR/atmtest.c -latm >/dev/null 2>&1; then
	echo "TC_CONFIG_ATM:=y" >>$CONFIG
	echo yes
	else
	echo no
	fi
	rm -f $TMPDIR/atmtest.c $TMPDIR/atmtest
	}

	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_ipt()
	{
	if ! grep TC_CONFIG_XT $CONFIG > /dev/null; then
	echo "using iptables"
	fi
	}

	check_ipt_lib_dir()
	{
	IPT_LIB_DIR=$(${PKG_CONFIG} --variable=xtlibdir xtables)
	if [ -n "$IPT_LIB_DIR" ]; then
	echo $IPT_LIB_DIR
	echo "IPT_LIB_DIR:=$IPT_LIB_DIR" >> $CONFIG
	return
	fi

	for dir in /lib /usr/lib /usr/local/lib; do
	for file in "xtables" "iptables"; do
	file="$dir/$file/libt_so"
	if [ -f $file ]; then
	echo ${file%/*}
	echo "IPT_LIB_DIR:=${file%/*}" >> $CONFIG
	return
	fi
	done
	done
	echo "not found!"
	}

	check_setns()
	{
	cat >$TMPDIR/setnstest.c <<EOF
	#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 <sys/stat.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
	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_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
	#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
	}

	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]
	--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
	--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

	[ -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"

	echo -n " ATM "
	check_atm

	check_xtables
	if ! grep -q TC_CONFIG_NO_XT $CONFIG; then
	echo -n " IPT "
	check_xt
	check_xt_old
	check_xt_old_internal_h
	check_ipt

	echo -n " IPSET "
	check_ipset
	fi

	echo
	check_lib_dir
	if ! grep -q TC_CONFIG_NO_XT $CONFIG; then
	echo -n "iptables modules directory: "
	check_ipt_lib_dir
	fi

	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 "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 >> $CONFIG
	echo "%.o: %.c" >> $CONFIG
	echo ' $(QUIET_CC)$(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CPPFLAGS) -c -o $@ $<' >> $CONFIG