[mirror_iproute2.git] / configure

#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# This is not an autoconf generated configure
#
# Influential LIBBPF environment variables:
#   LIBBPF_FORCE={on,off}   on: require link against libbpf;
#                           off: disable libbpf probing
#   LIBBPF_DIR              Path to libbpf DESTDIR to use

INCLUDE=${1:-"$PWD/include"}

# 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_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_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
}

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
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 "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 $@ $<' >> $CONFIG
Commit	Line	Data
	1	#!/bin/sh
	2	# SPDX-License-Identifier: GPL-2.0
	3	# This is not an autoconf generated configure
	4	#
	5	# Influential LIBBPF environment variables:
	6	# LIBBPF_FORCE={on,off} on: require link against libbpf;
	7	# off: disable libbpf probing
	8	# LIBBPF_DIR Path to libbpf DESTDIR to use
	9
	10	INCLUDE=${1:-"$PWD/include"}
	11
	12	# Output file which is input to Makefile
	13	CONFIG=config.mk
	14
	15	# Make a temp directory in build tree.
	16	TMPDIR=$(mktemp -d config.XXXXXX)
	17	trap 'status=$?; rm -rf $TMPDIR; exit $status' EXIT HUP INT QUIT TERM
	18
	19	check_toolchain()
	20	{
	21	: ${PKG_CONFIG:=pkg-config}
	22	: ${AR=ar}
	23	: ${CC=gcc}
	24	: ${YACC=bison}
	25	echo "PKG_CONFIG:=${PKG_CONFIG}" >>$CONFIG
	26	echo "AR:=${AR}" >>$CONFIG
	27	echo "CC:=${CC}" >>$CONFIG
	28	echo "YACC:=${YACC}" >>$CONFIG
	29	}
	30
	31	check_atm()
	32	{
	33	cat >$TMPDIR/atmtest.c <<EOF
	34	#include <atm.h>
	35	int main(int argc, char **argv) {
	36	struct atm_qos qos;
	37	(void) text2qos("aal5,ubr:sdu=9180,rx:none",&qos,0);
	38	return 0;
	39	}
	40	EOF
	41
	42	if $CC -I$INCLUDE -o $TMPDIR/atmtest $TMPDIR/atmtest.c -latm >/dev/null 2>&1; then
	43	echo "TC_CONFIG_ATM:=y" >>$CONFIG
	44	echo yes
	45	else
	46	echo no
	47	fi
	48	rm -f $TMPDIR/atmtest.c $TMPDIR/atmtest
	49	}
	50
	51	check_xtables()
	52	{
	53	if ! ${PKG_CONFIG} xtables --exists; then
	54	echo "TC_CONFIG_NO_XT:=y" >>$CONFIG
	55	fi
	56	}
	57
	58	check_xt()
	59	{
	60	#check if we have xtables from iptables >= 1.4.5.
	61	cat >$TMPDIR/ipttest.c <<EOF
	62	#include <xtables.h>
	63	#include <linux/netfilter.h>
	64	static struct xtables_globals test_globals = {
	65	.option_offset = 0,
	66	.program_name = "tc-ipt",
	67	.program_version = XTABLES_VERSION,
	68	.orig_opts = NULL,
	69	.opts = NULL,
	70	.exit_err = NULL,
	71	};
	72
	73	int main(int argc, char **argv)
	74	{
	75	xtables_init_all(&test_globals, NFPROTO_IPV4);
	76	return 0;
	77	}
	78	EOF
	79
	80	if $CC -I$INCLUDE $IPTC -o $TMPDIR/ipttest $TMPDIR/ipttest.c $IPTL \
	81	$(${PKG_CONFIG} xtables --cflags --libs) -ldl >/dev/null 2>&1; then
	82	echo "TC_CONFIG_XT:=y" >>$CONFIG
	83	echo "using xtables"
	84	fi
	85	rm -f $TMPDIR/ipttest.c $TMPDIR/ipttest
	86	}
	87
	88	check_xt_old()
	89	{
	90	# bail if previous XT checks has already succeeded.
	91	grep -q TC_CONFIG_XT $CONFIG && return
	92
	93	#check if we don't need our internal header ..
	94	cat >$TMPDIR/ipttest.c <<EOF
	95	#include <xtables.h>
	96	char *lib_dir;
	97	unsigned int global_option_offset = 0;
	98	const char *program_version = XTABLES_VERSION;
	99	const char *program_name = "tc-ipt";
	100	struct afinfo afinfo = {
	101	.libprefix = "libxt_",
	102	};
	103
	104	void exit_error(enum exittype status, const char *msg, ...)
	105	{
	106	}
	107
	108	int main(int argc, char **argv) {
	109
	110	return 0;
	111	}
	112
	113	EOF
	114
	115	if $CC -I$INCLUDE $IPTC -o $TMPDIR/ipttest $TMPDIR/ipttest.c $IPTL -ldl >/dev/null 2>&1; then
	116	echo "TC_CONFIG_XT_OLD:=y" >>$CONFIG
	117	echo "using old xtables (no need for xt-internal.h)"
	118	fi
	119	rm -f $TMPDIR/ipttest.c $TMPDIR/ipttest
	120	}
	121
	122	check_xt_old_internal_h()
	123	{
	124	# bail if previous XT checks has already succeeded.
	125	grep -q TC_CONFIG_XT $CONFIG && return
	126
	127	#check if we need our own internal.h
	128	cat >$TMPDIR/ipttest.c <<EOF
	129	#include <xtables.h>
	130	#include "xt-internal.h"
	131	char *lib_dir;
	132	unsigned int global_option_offset = 0;
	133	const char *program_version = XTABLES_VERSION;
	134	const char *program_name = "tc-ipt";
	135	struct afinfo afinfo = {
	136	.libprefix = "libxt_",
	137	};
	138
	139	void exit_error(enum exittype status, const char *msg, ...)
	140	{
	141	}
	142
	143	int main(int argc, char **argv) {
	144
	145	return 0;
	146	}
	147
	148	EOF
	149	if $CC -I$INCLUDE $IPTC -o $TMPDIR/ipttest $TMPDIR/ipttest.c $IPTL -ldl >/dev/null 2>&1; then
	150	echo "using old xtables with xt-internal.h"
	151	echo "TC_CONFIG_XT_OLD_H:=y" >>$CONFIG
	152	fi
	153	rm -f $TMPDIR/ipttest.c $TMPDIR/ipttest
	154	}
	155
	156	check_ipt()
	157	{
	158	if ! grep TC_CONFIG_XT $CONFIG > /dev/null; then
	159	echo "using iptables"
	160	fi
	161	}
	162
	163	check_ipt_lib_dir()
	164	{
	165	IPT_LIB_DIR=$(${PKG_CONFIG} --variable=xtlibdir xtables)
	166	if [ -n "$IPT_LIB_DIR" ]; then
	167	echo $IPT_LIB_DIR
	168	echo "IPT_LIB_DIR:=$IPT_LIB_DIR" >> $CONFIG
	169	return
	170	fi
	171
	172	for dir in /lib /usr/lib /usr/local/lib; do
	173	for file in "xtables" "iptables"; do
	174	file="$dir/$file/libt_so"
	175	if [ -f $file ]; then
	176	echo ${file%/*}
	177	echo "IPT_LIB_DIR:=${file%/*}" >> $CONFIG
	178	return
	179	fi
	180	done
	181	done
	182	echo "not found!"
	183	}
	184
	185	check_setns()
	186	{
	187	cat >$TMPDIR/setnstest.c <<EOF
	188	#include <sched.h>
	189	int main(int argc, char **argv)
	190	{
	191	(void)setns(0,0);
	192	return 0;
	193	}
	194	EOF
	195	if $CC -I$INCLUDE -o $TMPDIR/setnstest $TMPDIR/setnstest.c >/dev/null 2>&1; then
	196	echo "IP_CONFIG_SETNS:=y" >>$CONFIG
	197	echo "yes"
	198	echo "CFLAGS += -DHAVE_SETNS" >>$CONFIG
	199	else
	200	echo "no"
	201	fi
	202	rm -f $TMPDIR/setnstest.c $TMPDIR/setnstest
	203	}
	204
	205	check_ipset()
	206	{
	207	cat >$TMPDIR/ipsettest.c <<EOF
	208	#include <linux/netfilter/ipset/ip_set.h>
	209	#ifndef IP_SET_INVALID
	210	#define IPSET_DIM_MAX 3
	211	typedef unsigned short ip_set_id_t;
	212	#endif
	213	#include <linux/netfilter/xt_set.h>
	214
	215	struct xt_set_info info;
	216	#if IPSET_PROTOCOL == 6 \|\| IPSET_PROTOCOL == 7
	217	int main(void)
	218	{
	219	return IPSET_MAXNAMELEN;
	220	}
	221	#else
	222	#error unknown ipset version
	223	#endif
	224	EOF
	225
	226	if $CC -I$INCLUDE -o $TMPDIR/ipsettest $TMPDIR/ipsettest.c >/dev/null 2>&1; then
	227	echo "TC_CONFIG_IPSET:=y" >>$CONFIG
	228	echo "yes"
	229	else
	230	echo "no"
	231	fi
	232	rm -f $TMPDIR/ipsettest.c $TMPDIR/ipsettest
	233	}
	234
	235	check_elf()
	236	{
	237	if ${PKG_CONFIG} libelf --exists; then
	238	echo "HAVE_ELF:=y" >>$CONFIG
	239	echo "yes"
	240
	241	echo 'CFLAGS += -DHAVE_ELF' `${PKG_CONFIG} libelf --cflags` >> $CONFIG
	242	echo 'LDLIBS += ' `${PKG_CONFIG} libelf --libs` >>$CONFIG
	243	else
	244	echo "no"
	245	fi
	246	}
	247
	248	have_libbpf_basic()
	249	{
	250	cat >$TMPDIR/libbpf_test.c <<EOF
	251	#include <bpf/libbpf.h>
	252	int main(int argc, char **argv) {
	253	bpf_program__set_autoload(NULL, false);
	254	bpf_map__ifindex(NULL);
	255	bpf_map__set_pin_path(NULL, NULL);
	256	bpf_object__open_file(NULL, NULL);
	257	return 0;
	258	}
	259	EOF
	260
	261	$CC -o $TMPDIR/libbpf_test $TMPDIR/libbpf_test.c $LIBBPF_CFLAGS $LIBBPF_LDLIBS >/dev/null 2>&1
	262	local ret=$?
	263
	264	rm -f $TMPDIR/libbpf_test.c $TMPDIR/libbpf_test
	265	return $ret
	266	}
	267
	268	have_libbpf_sec_name()
	269	{
	270	cat >$TMPDIR/libbpf_sec_test.c <<EOF
	271	#include <bpf/libbpf.h>
	272	int main(int argc, char **argv) {
	273	void *ptr;
	274	bpf_program__section_name(NULL);
	275	return 0;
	276	}
	277	EOF
	278
	279	$CC -o $TMPDIR/libbpf_sec_test $TMPDIR/libbpf_sec_test.c $LIBBPF_CFLAGS $LIBBPF_LDLIBS >/dev/null 2>&1
	280	local ret=$?
	281
	282	rm -f $TMPDIR/libbpf_sec_test.c $TMPDIR/libbpf_sec_test
	283	return $ret
	284	}
	285
	286	check_force_libbpf_on()
	287	{
	288	# if set LIBBPF_FORCE=on but no libbpf support, just exist the config
	289	# process to make sure we don't build without libbpf.
	290	if [ "$LIBBPF_FORCE" = on ]; then
	291	echo " LIBBPF_FORCE=on set, but couldn't find a usable libbpf"
	292	exit 1
	293	fi
	294	}
	295
	296	check_libbpf()
	297	{
	298	# if set LIBBPF_FORCE=off, disable libbpf entirely
	299	if [ "$LIBBPF_FORCE" = off ]; then
	300	echo "no"
	301	return
	302	fi
	303
	304	if ! ${PKG_CONFIG} libbpf --exists && [ -z "$LIBBPF_DIR" ] ; then
	305	echo "no"
	306	check_force_libbpf_on
	307	return
	308	fi
	309
	310	if [ $(uname -m) = x86_64 ]; then
	311	local LIBBPF_LIBDIR="${LIBBPF_DIR}/usr/lib64"
	312	else
	313	local LIBBPF_LIBDIR="${LIBBPF_DIR}/usr/lib"
	314	fi
	315
	316	if [ -n "$LIBBPF_DIR" ]; then
	317	LIBBPF_CFLAGS="-I${LIBBPF_DIR}/usr/include"
	318	LIBBPF_LDLIBS="${LIBBPF_LIBDIR}/libbpf.a -lz -lelf"
	319	LIBBPF_VERSION=$(PKG_CONFIG_LIBDIR=${LIBBPF_LIBDIR}/pkgconfig ${PKG_CONFIG} libbpf --modversion)
	320	else
	321	LIBBPF_CFLAGS=$(${PKG_CONFIG} libbpf --cflags)
	322	LIBBPF_LDLIBS=$(${PKG_CONFIG} libbpf --libs)
	323	LIBBPF_VERSION=$(${PKG_CONFIG} libbpf --modversion)
	324	fi
	325
	326	if ! have_libbpf_basic; then
	327	echo "no"
	328	echo " libbpf version $LIBBPF_VERSION is too low, please update it to at least 0.1.0"
	329	check_force_libbpf_on
	330	return
	331	else
	332	echo "HAVE_LIBBPF:=y" >> $CONFIG
	333	echo 'CFLAGS += -DHAVE_LIBBPF ' $LIBBPF_CFLAGS >> $CONFIG
	334	echo "CFLAGS += -DLIBBPF_VERSION=\\\"$LIBBPF_VERSION\\\"" >> $CONFIG
	335	echo 'LDLIBS += ' $LIBBPF_LDLIBS >> $CONFIG
	336
	337	if [ -z "$LIBBPF_DIR" ]; then
	338	echo "CFLAGS += -DLIBBPF_DYNAMIC" >> $CONFIG
	339	fi
	340	fi
	341
	342	# bpf_program__title() is deprecated since libbpf 0.2.0, use
	343	# bpf_program__section_name() instead if we support
	344	if have_libbpf_sec_name; then
	345	echo "HAVE_LIBBPF_SECTION_NAME:=y" >> $CONFIG
	346	echo 'CFLAGS += -DHAVE_LIBBPF_SECTION_NAME ' >> $CONFIG
	347	fi
	348
	349	echo "yes"
	350	echo " libbpf version $LIBBPF_VERSION"
	351	}
	352
	353	check_selinux()
	354	# SELinux is a compile time option in the ss utility
	355	{
	356	if ${PKG_CONFIG} libselinux --exists; then
	357	echo "HAVE_SELINUX:=y" >>$CONFIG
	358	echo "yes"
	359
	360	echo 'LDLIBS +=' `${PKG_CONFIG} --libs libselinux` >>$CONFIG
	361	echo 'CFLAGS += -DHAVE_SELINUX' `${PKG_CONFIG} --cflags libselinux` >>$CONFIG
	362	else
	363	echo "no"
	364	fi
	365	}
	366
	367	check_mnl()
	368	{
	369	if ${PKG_CONFIG} libmnl --exists; then
	370	echo "HAVE_MNL:=y" >>$CONFIG
	371	echo "yes"
	372
	373	echo 'CFLAGS += -DHAVE_LIBMNL' `${PKG_CONFIG} libmnl --cflags` >>$CONFIG
	374	echo 'LDLIBS +=' `${PKG_CONFIG} libmnl --libs` >> $CONFIG
	375	else
	376	echo "no"
	377	fi
	378	}
	379
	380	check_berkeley_db()
	381	{
	382	cat >$TMPDIR/dbtest.c <<EOF
	383	#include <fcntl.h>
	384	#include <stdlib.h>
	385	#include <db_185.h>
	386	int main(int argc, char **argv) {
	387	dbopen("/tmp/xxx_test_db.db", O_CREAT\|O_RDWR, 0644, DB_HASH, NULL);
	388	return 0;
	389	}
	390	EOF
	391	if $CC -I$INCLUDE -o $TMPDIR/dbtest $TMPDIR/dbtest.c -ldb >/dev/null 2>&1; then
	392	echo "HAVE_BERKELEY_DB:=y" >>$CONFIG
	393	echo "yes"
	394	else
	395	echo "no"
	396	fi
	397	rm -f $TMPDIR/dbtest.c $TMPDIR/dbtest
	398	}
	399
	400	check_strlcpy()
	401	{
	402	cat >$TMPDIR/strtest.c <<EOF
	403	#include <string.h>
	404	int main(int argc, char **argv) {
	405	char dst[10];
	406	strlcpy(dst, "test", sizeof(dst));
	407	return 0;
	408	}
	409	EOF
	410	if $CC -I$INCLUDE -o $TMPDIR/strtest $TMPDIR/strtest.c >/dev/null 2>&1; then
	411	echo "no"
	412	else
	413	if ${PKG_CONFIG} libbsd --exists; then
	414	echo 'CFLAGS += -DHAVE_LIBBSD' `${PKG_CONFIG} libbsd --cflags` >>$CONFIG
	415	echo 'LDLIBS +=' `${PKG_CONFIG} libbsd --libs` >> $CONFIG
	416	echo "no"
	417	else
	418	echo 'CFLAGS += -DNEED_STRLCPY' >>$CONFIG
	419	echo "yes"
	420	fi
	421	fi
	422	rm -f $TMPDIR/strtest.c $TMPDIR/strtest
	423	}
	424
	425	check_cap()
	426	{
	427	if ${PKG_CONFIG} libcap --exists; then
	428	echo "HAVE_CAP:=y" >>$CONFIG
	429	echo "yes"
	430
	431	echo 'CFLAGS += -DHAVE_LIBCAP' `${PKG_CONFIG} libcap --cflags` >>$CONFIG
	432	echo 'LDLIBS +=' `${PKG_CONFIG} libcap --libs` >> $CONFIG
	433	else
	434	echo "no"
	435	fi
	436	}
	437
	438	quiet_config()
	439	{
	440	cat <<EOF
	441	# user can control verbosity similar to kernel builds (e.g., V=1)
	442	ifeq ("\$(origin V)", "command line")
	443	VERBOSE = \$(V)
	444	endif
	445	ifndef VERBOSE
	446	VERBOSE = 0
	447	endif
	448	ifeq (\$(VERBOSE),1)
	449	Q =
	450	else
	451	Q = @
	452	endif
	453
	454	ifeq (\$(VERBOSE), 0)
	455	QUIET_CC = @echo ' CC '\$@;
	456	QUIET_AR = @echo ' AR '\$@;
	457	QUIET_LINK = @echo ' LINK '\$@;
	458	QUIET_YACC = @echo ' YACC '\$@;
	459	QUIET_LEX = @echo ' LEX '\$@;
	460	endif
	461	EOF
	462	}
	463
	464	echo "# Generated config based on" $INCLUDE >$CONFIG
	465	quiet_config >> $CONFIG
	466
	467	check_toolchain
	468
	469	echo "TC schedulers"
	470
	471	echo -n " ATM "
	472	check_atm
	473
	474	check_xtables
	475	if ! grep -q TC_CONFIG_NO_XT $CONFIG; then
	476	echo -n " IPT "
	477	check_xt
	478	check_xt_old
	479	check_xt_old_internal_h
	480	check_ipt
	481
	482	echo -n " IPSET "
	483	check_ipset
	484	fi
	485
	486	echo
	487	if ! grep -q TC_CONFIG_NO_XT $CONFIG; then
	488	echo -n "iptables modules directory: "
	489	check_ipt_lib_dir
	490	fi
	491
	492	echo -n "libc has setns: "
	493	check_setns
	494
	495	echo -n "SELinux support: "
	496	check_selinux
	497
	498	echo -n "libbpf support: "
	499	check_libbpf
	500
	501	echo -n "ELF support: "
	502	check_elf
	503
	504	echo -n "libmnl support: "
	505	check_mnl
	506
	507	echo -n "Berkeley DB: "
	508	check_berkeley_db
	509
	510	echo -n "need for strlcpy: "
	511	check_strlcpy
	512
	513	echo -n "libcap support: "
	514	check_cap
	515
	516	echo >> $CONFIG
	517	echo "%.o: %.c" >> $CONFIG
	518	echo ' $(QUIET_CC)$(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CPPFLAGS) -c -o $@ $<' >> $CONFIG