nl80211: Support not specifying the frame frequency

If the frequency is not specified the frame is now sent over
the channel used by the current BSS.

This will also log the payload of each sent CMD_FRAME.

Signed-hostap: Nicolas Cavallari <cavallar@lri.fr>
[antonio@open-mesh.com: commit message reworded]
Signed-hostap: Antonio Quartulli <antonio@open-mesh.com>

src/drivers/driver_nl80211.c

@@ -9200,12 +9200,13 @@ static int nl80211_send_frame_cmd(struct i802_bss *bss,
 	wpa_printf(MSG_MSGDUMP, "nl80211: CMD_FRAME freq=%u wait=%u no_cck=%d "
 		   "no_ack=%d offchanok=%d",
 		   freq, wait, no_cck, no_ack, offchanok);
+	wpa_hexdump(MSG_MSGDUMP, "CMD_FRAME", buf, buf_len);
 	nl80211_cmd(drv, msg, 0, NL80211_CMD_FRAME);
 
 	if (nl80211_set_iface_id(msg, bss) < 0)
 		goto nla_put_failure;
-
-	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, freq);
+	if (freq)
+		NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, freq);
 	if (wait)
 		NLA_PUT_U32(msg, NL80211_ATTR_DURATION, wait);
 	if (offchanok && (drv->capa.flags & WPA_DRIVER_FLAGS_OFFCHANNEL_TX))