From 1155b43c0527a92ce1d08d76493481fc211600e7 Mon Sep 17 00:00:00 2001
From: bde <bde@FreeBSD.org>
Date: Mon, 13 Jul 1998 10:44:02 +0000
Subject: Don't attempt to optimize the space allocated for bpf headers if
 sizeof(struct bpf_hdr) > 20.  20 is normal on 32-bit systems with 32-bit
 alignment, but we still assume that the last 2 bytes of the struct are
 unnecessary padding on such systems.  On systems with 64-bit longs, struct
 timeval is bloated to 16 bytes, so bpf headers certainly don't fit in 18
 bytes.

---
 sys/net/bpf.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'sys/net/bpf.h')

diff --git a/sys/net/bpf.h b/sys/net/bpf.h
index 7847d72..9bcd100 100644
--- a/sys/net/bpf.h
+++ b/sys/net/bpf.h
@@ -38,7 +38,7 @@
  *      @(#)bpf.h	8.1 (Berkeley) 6/10/93
  *	@(#)bpf.h	1.34 (LBL)     6/16/96
  *
- * $Id$
+ * $Id: bpf.h,v 1.12 1997/02/22 09:40:55 peter Exp $
  */
 
 #ifndef _NET_BPF_H_
@@ -128,7 +128,8 @@ struct bpf_hdr {
  * Only the kernel needs to know about it; applications use bh_hdrlen.
  */
 #ifdef KERNEL
-#define SIZEOF_BPF_HDR 18
+#define	SIZEOF_BPF_HDR	(sizeof(struct bpf_hdr) <= 20 ? 18 : \
+    sizeof(struct bpf_hdr))
 #endif
 
 /*
-- 
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