add IEEE80211_RADIOTAP_F_FCS radiotap flag from NetBSD.

use it in drivers that leave the 802.11 FCS in frames
passed to radiotap BPF.  otherwise, userland has no way
to know if FCS is included or not as it depends on drivers.
this is required by some ports (aircrack).

requested by dhill@

diff --git a/sys/dev/ic/ath.c b/sys/dev/ic/ath.c
index fe5f04c..565f079 100644 (file)
--- a/sys/dev/ic/ath.c
+++ b/sys/dev/ic/ath.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: ath.c,v 1.75 2008/08/27 09:05:03 damien Exp $  */
+/*      $OpenBSD: ath.c,v 1.76 2008/08/27 10:01:18 damien Exp $  */
 /*     $NetBSD: ath.c,v 1.37 2004/08/18 21:59:39 dyoung Exp $  */
 
 /*-
@@ -2025,6 +2025,7 @@ ath_rx_proc(void *arg, int npending)
                if (sc->sc_drvbpf) {
                        struct mbuf mb;
 
+                       sc->sc_rxtap.wr_flags = IEEE80211_RADIOTAP_F_FCS;
                        sc->sc_rxtap.wr_rate =
                            sc->sc_hwmap[ds->ds_rxstat.rs_rate] &
                            IEEE80211_RATE_VAL;

diff --git a/sys/net80211/ieee80211_radiotap.h b/sys/net80211/ieee80211_radiotap.h
index 938f74b..72bb526 100644 (file)
--- a/sys/net80211/ieee80211_radiotap.h
+++ b/sys/net80211/ieee80211_radiotap.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: ieee80211_radiotap.h,v 1.8 2006/06/23 21:34:15 reyk Exp $ */
+/* $OpenBSD: ieee80211_radiotap.h,v 1.9 2008/08/27 10:01:18 damien Exp $ */
 /* $FreeBSD: src/sys/net80211/ieee80211_radiotap.h,v 1.3 2004/04/05 22:13:21 sam Exp $ */
 /* $NetBSD: ieee80211_radiotap.h,v 1.9 2004/06/06 04:13:28 dyoung Exp $ */
 
@@ -202,5 +202,6 @@ enum ieee80211_radiotap_type {
 #define        IEEE80211_RADIOTAP_F_FRAG       0x08    /* sent/received
                                                 * with fragmentation
                                                 */
+#define        IEEE80211_RADIOTAP_F_FCS        0x10    /* frame includes FCS */
 
 #endif /* _NET_IF_IEEE80211RADIOTAP_H_ */