wlantest: Support HT Control field in QoS Data frames

Extend Data frame processing (and decryption) to handle +HTC frames by
skipping the HT Control field at the end of the frame header. While this
is not an exact match of the rules in IEEE Std 802.11-2020 for when the
HT Control field is present in frames (e.g., no check of the TXVECTOR
value), this is good enough to cover the most likely used cases.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>

wlantest/rx_data.c

@@ -847,6 +847,8 @@ void rx_data(struct wlantest *wt, const u8 *data, size_t len)
 		qos = data + hdrlen;
 		hdrlen += 2;
 	}
+	if ((fc & WLAN_FC_HTC) && (stype & 0x08))
+		hdrlen += 4; /* HT Control field */
 	if (len < hdrlen)
 		return;
 	wt->rx_data++;