| 1 |
dnl Check to find out whether the running kernel has support for TUN/TAP |
| 2 |
|
| 3 |
AC_DEFUN([tinc_TUNTAP], |
| 4 |
[ |
| 5 |
AC_ARG_WITH(kernel, |
| 6 |
[ --with-kernel=dir give the directory with kernel sources] |
| 7 |
[ (default: /usr/src/linux)], |
| 8 |
kerneldir="$withval", |
| 9 |
kerneldir="/usr/src/linux" |
| 10 |
) |
| 11 |
|
| 12 |
AC_CACHE_CHECK([for linux/if_tun.h], tinc_cv_linux_if_tun_h, |
| 13 |
[ |
| 14 |
AC_TRY_COMPILE([#include "$kerneldir/include/linux/if_tun.h"], |
| 15 |
[int a = IFF_TAP;], |
| 16 |
if_tun_h="\"$kerneldir/include/linux/if_tun.h\"", |
| 17 |
[AC_TRY_COMPILE([#include <linux/if_tun.h>], |
| 18 |
[int a = IFF_TAP;], |
| 19 |
if_tun_h="default", |
| 20 |
if_tun_h="no" |
| 21 |
)] |
| 22 |
) |
| 23 |
|
| 24 |
if test $if_tun_h = no; then |
| 25 |
tinc_cv_linux_if_tun_h=none |
| 26 |
else |
| 27 |
tinc_cv_linux_if_tun_h="$if_tun_h" |
| 28 |
fi |
| 29 |
]) |
| 30 |
|
| 31 |
if test $tinc_cv_linux_if_tun_h != none; then |
| 32 |
AC_DEFINE(HAVE_TUNTAP, 1, [Universal tun/tap driver present]) |
| 33 |
if test $tinc_cv_linux_if_tun_h != default; then |
| 34 |
AC_DEFINE_UNQUOTED(LINUX_IF_TUN_H, $tinc_cv_linux_if_tun_h, [Location of if_tun.h]) |
| 35 |
fi |
| 36 |
fi |
| 37 |
AC_SUBST(LINUX_IF_TUN_H) |
| 38 |
AC_SUBST(HAVE_TUNTAP) |
| 39 |
]) |
