From 1c141194e3587cc8124e5f4512dc3030e5a104b1 Mon Sep 17 00:00:00 2001
From: Romain Naour <romain.naour@gmail.com>
Date: Sun, 28 Aug 2016 22:06:09 +0200
Subject: [PATCH] xio-tun: remove if_tun.h kernel header

xio-tun mixes userspace and kernel headers.

http://wiki.musl-libc.org/wiki/FAQ#Q:_why_am_i_getting_.22error:_redefinition_of_struct_ethhdr.2Ftcphdr.2Fetc.22_.3F

Signed-off-by: Romain Naour <romain.naour@gmail.com>
---
 config.h.in   | 3 ---
 configure.in  | 8 +-------
 sysincludes.h | 3 ---
 xio-tun.c     | 6 ++++++
 4 files changed, 7 insertions(+), 13 deletions(-)

diff --git a/config.h.in b/config.h.in
index 9058bf8..ed0962c 100644
--- a/config.h.in
+++ b/config.h.in
@@ -258,9 +258,6 @@
 /* Define if you have the <linux/errqueue.h> header file.  */
 #undef HAVE_LINUX_ERRQUEUE_H
 
-/* Define if you have the <linux/if_tun.h> header file.  */
-#undef HAVE_LINUX_IF_TUN_H
-
 /* Define if you have the <netpacket/packet.h> header file.  */
 #undef HAVE_NETPACKET_PACKET_H
 
diff --git a/configure.in b/configure.in
index 1d2e76f..27bb3d5 100644
--- a/configure.in
+++ b/configure.in
@@ -78,7 +78,7 @@ AC_CHECK_HEADERS(arpa/nameser.h)
 
 AC_HEADER_RESOLV()
 
-AC_CHECK_HEADERS(termios.h linux/if_tun.h)
+AC_CHECK_HEADERS(termios.h)
 AC_CHECK_HEADERS(net/if_dl.h)
 AC_CHECK_HEADERS(linux/types.h)
 AC_CHECK_HEADER(linux/errqueue.h, AC_DEFINE(HAVE_LINUX_ERRQUEUE_H), [], [#include <sys/time.h>
@@ -680,12 +680,6 @@ AC_ARG_ENABLE(tun, [  --disable-tun           disable TUN/TAP support],
 	       esac],
 	       [AC_MSG_RESULT(yes);    WITH_TUN=1 ])
 
-#
-if ! test "$ac_cv_header_linux_if_tun_h" = 'yes'; then
-  AC_MSG_WARN(include file linux/if_tun.h not found, disabling TUN)
-  WITH_TUN=
-fi
-#
 if test -n "$WITH_TUN"; then
   AC_DEFINE(WITH_TUN)
 fi
diff --git a/sysincludes.h b/sysincludes.h
index 98dff77..28067f4 100644
--- a/sysincludes.h
+++ b/sysincludes.h
@@ -142,9 +142,6 @@
 #if HAVE_NETINET_IF_ETHER_H
 #include <netinet/if_ether.h>
 #endif
-#if HAVE_LINUX_IF_TUN_H
-#include <linux/if_tun.h>
-#endif
 
 #if HAVE_TERMIOS_H && _WITH_TERMIOS
 #include <termios.h>
diff --git a/xio-tun.c b/xio-tun.c
index 0628d27..f965a7e 100644
--- a/xio-tun.c
+++ b/xio-tun.c
@@ -14,6 +14,12 @@
 
 #include "xio-tun.h"
 
+/* TUNSETIFF flags from if_tun.h kernel header */
+#define IFF_TUN		0x0001
+#define IFF_TAP		0x0002
+#define IFF_NO_PI	0x1000
+
+#define TUNSETIFF	_IOW('T', 202, int)
 
 static int xioopen_tun(int argc, const char *argv[], struct opt *opts, int xioflags, xiofile_t *fd, unsigned groups, int dummy1, int dummy2, int dummy3);
 
-- 
2.5.5