wlantest: Tag and ignore generated packets

Rather than ignoring packets with a minimal 8-byte radiotap
header, which may occur elsewhere, tag generated (decrypted)
packets with an empty vendor namespace tag and ignore those.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

src/common/qca-vendor.h

@@ -18,6 +18,13 @@
 
 #define OUI_QCA 0x001374
 
+/**
+ * enum qca_radiotap_vendor_ids - QCA radiotap vendor namespace IDs
+ */
+enum qca_radiotap_vendor_ids {
+	QCA_RADIOTAP_VID_WLANTEST = 0,
+};
+
 /**
  * enum qca_nl80211_vendor_subcmds - QCA nl80211 vendor command identifiers
  *

wlantest/process.c

@@ -12,6 +12,7 @@
 #include "utils/radiotap.h"
 #include "utils/radiotap_iter.h"
 #include "common/ieee802_11_defs.h"
+#include "common/qca-vendor.h"
 #include "wlantest.h"
 
 
@@ -305,14 +306,16 @@ void wlantest_process(struct wlantest *wt, const u8 *data, size_t len)
 			failed = le_to_host16((*(u16 *) iter.this_arg)) &
 				IEEE80211_RADIOTAP_F_TX_FAIL;
 			break;
-
+		case IEEE80211_RADIOTAP_VENDOR_NAMESPACE:
+			if (WPA_GET_BE24(iter.this_arg) == OUI_QCA &&
+			    iter.this_arg[3] == QCA_RADIOTAP_VID_WLANTEST) {
+				add_note(wt, MSG_DEBUG,
+					 "Skip frame inserted by wlantest");
+				return;
+			}
 		}
 	}
 
-	if (iter._max_length == 8) {
-		add_note(wt, MSG_DEBUG, "Skip frame inserted by wlantest");
-		return;
-	}
 	frame = data + iter._max_length;
 	frame_len = len - iter._max_length;
 

wlantest/writepcap.c

@@ -12,6 +12,7 @@
 
 #include "utils/common.h"
 #include "wlantest.h"
+#include "common/qca-vendor.h"
 
 
 int write_pcap_init(struct wlantest *wt, const char *fname)
@@ -68,8 +69,10 @@ void write_pcap_decrypted(struct wlantest *wt, const u8 *buf1, size_t len1,
 	u8 rtap[] = {
 		0x00 /* rev */,
 		0x00 /* pad */,
-		0x08, 0x00, /* header len */
-		0x00, 0x00, 0x00, 0x00 /* present flags */
+		0x0e, 0x00, /* header len */
+		0x00, 0x00, 0x00, 0x40, /* present flags */
+		0x00, 0x13, 0x74, QCA_RADIOTAP_VID_WLANTEST,
+		0x00, 0x00
 	};
 	u8 *buf;
 	size_t len;