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Update to reflect correct usage:

Browse Source 
o leave IEEE80211_RADIOTAP_HDRLEN for portability to other systems but
  correct comment about radiotap headers being padded to 64-bytes
  (hasn't been true for many years)
o remove reference to IEEE80211_RADIOTAP_FCS; it was never used, instead
  the flags are marked with IEEE80211_RADIOTAP_F_FCS to indicate whether
  or not FCS is present

Might be better to just remove IEEE80211_RADIOTAP_HDRLEN so drivers
don't bogusly pad.

MFC after:	2 weeks
This commit is contained in:
Sam Leffler 2007-03-11 07:42:02 +00:00
parent 70e28b9a2d
commit c6303b231f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=167443
1 changed files with 16 additions and 18 deletions
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34
sys/net80211/ieee80211_radiotap.h
View File

@ -1,5 +1,5 @@
/* $FreeBSD$ */
/* $NetBSD: ieee80211_radiotap.h,v 1.10 2005/01/04 00:34:58 dyoung Exp $ */
/* $NetBSD: ieee80211_radiotap.h,v 1.16 2007/01/06 05:51:15 dyoung Exp $ */
/*-
* Copyright (c) 2003, 2004 David Young. All rights reserved.
@ -29,14 +29,14 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
#ifndef _NET_IF_IEEE80211RADIOTAP_H_
#define _NET_IF_IEEE80211RADIOTAP_H_
#ifndef _NET80211_IEEE80211_RADIOTAP_H_
#define _NET80211_IEEE80211_RADIOTAP_H_
/* A generic radio capture format is desirable. There is one for
* Linux, but it is neither rigidly defined (there were not even
* units given for some fields) nor easily extensible.
/* A generic radio capture format is desirable. It must be
* rigidly defined (e.g., units for fields should be given),
* and easily extensible.
*
* I suggest the following extensible radio capture format. It is
* The following is an extensible radio capture format. It is
* based on a bitmap indicating which fields are present.
*
* I am trying to describe precisely what the application programmer
@ -52,12 +52,13 @@
#endif
#endif /* defined(__KERNEL__) || defined(_KERNEL) */
/* XXX tcpdump/libpcap do not tolerate variable-length headers,
* yet, so we pad every radiotap header to 64 bytes. Ugh.
*/
#define IEEE80211_RADIOTAP_HDRLEN 64
#define IEEE80211_RADIOTAP_HDRLEN 64 /* XXX deprecated */
/* The radio capture header precedes the 802.11 header. */
/*
* The radio capture header precedes the 802.11 header.
*
* Note well: all radiotap fields are little-endian.
*/
struct ieee80211_radiotap_header {
u_int8_t it_version; /* Version 0. Only increases
* for drastic changes,
@ -79,7 +80,8 @@ struct ieee80211_radiotap_header {
*/
} __attribute__((__packed__));
/* Name Data type Units
/*
* Name Data type Units
* ---- --------- -----
*
* IEEE80211_RADIOTAP_TSFT u_int64_t microseconds
@ -158,10 +160,6 @@ struct ieee80211_radiotap_header {
*
* Unitless indication of the Rx/Tx antenna for this packet.
* The first antenna is antenna 0.
*
* IEEE80211_RADIOTAP_FCS u_int32_t data
*
* FCS from frame in network byte order.
*/
enum ieee80211_radiotap_type {
IEEE80211_RADIOTAP_TSFT = 0,
@ -214,4 +212,4 @@ enum ieee80211_radiotap_type {
*/
#define IEEE80211_RADIOTAP_F_BADFCS 0x40 /* does not pass FCS check */
#endif /* _NET_IF_IEEE80211RADIOTAP_H_ */
#endif /* !_NET80211_IEEE80211_RADIOTAP_H_ */