--- Gnu-Mach/include/device/bpf.h	2020/09/02 04:36:57	1.1.1.1
+++ Gnu-Mach/include/device/bpf.h	2020/09/02 04:45:36	1.1.1.2
@@ -45,10 +45,6 @@
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *      This product includes software developed by the University of
- *      California, Berkeley and its contributors.
  * 4. Neither the name of the University nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
@@ -72,7 +68,8 @@
 #ifndef _DEVICE_BPF_H_
 #define _DEVICE_BPF_H_
 
-#if 0	/* not used in MK now */
+#include <sys/types.h> /* u_short */
+
 /*
  * Alignment macros.  BPF_WORDALIGN rounds up to the next 
  * even multiple of BPF_ALIGNMENT. 
@@ -115,14 +112,14 @@ struct bpf_version {
 #define DLT_PPP		9	/* Point-to-point Protocol */
 #define DLT_FDDI	10	/* FDDI */
 
-#endif /* 0 */
-
 /*
  * The instruction encondings.
  */
 
-/* Magic number for the first instruction */
-#define BPF_BEGIN NETF_BPF
+/* Magic number and flags for the first instruction */
+#define BPF_BEGIN	NETF_BPF
+#define BPF_IN		NETF_IN
+#define BPF_OUT		NETF_OUT
 
 /* instruction classes */
 #define BPF_CLASS(code) ((code) & 0x07)