mac80211: use same flag everywhere to avoid sequence number overwrite

Use the IEEE80211_TX_CTRL_NO_SEQNO flag in ieee80211_tx_info to mark
probe requests whose sequence number must not be overwritten. This
provides consistency with the radiotap flag that can be set to indicate
that the sequence number of an injected frame should not be overwritten.

Signed-off-by: Mathy Vanhoef <Mathy.Vanhoef@kuleuven.be>
Link: https://lore.kernel.org/r/20200723100153.31631-4-Mathy.Vanhoef@kuleuven.be
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/ieee80211_i.h

@@ -164,7 +164,6 @@ typedef unsigned __bitwise ieee80211_tx_result;
 #define TX_DROP		((__force ieee80211_tx_result) 1u)
 #define TX_QUEUED	((__force ieee80211_tx_result) 2u)
 
-#define IEEE80211_TX_NO_SEQNO		BIT(0)
 #define IEEE80211_TX_UNICAST		BIT(1)
 #define IEEE80211_TX_PS_BUFFERED	BIT(2)
 

net/mac80211/scan.c

@@ -591,7 +591,6 @@ static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata,
 					  struct ieee80211_channel *channel)
 {
 	struct sk_buff *skb;
-	u32 txdata_flags = 0;
 
 	skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel,
 					ssid, ssid_len,
@@ -600,15 +599,15 @@ static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata,
 	if (skb) {
 		if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) {
 			struct ieee80211_hdr *hdr = (void *)skb->data;
+			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 			u16 sn = get_random_u32();
 
-			txdata_flags |= IEEE80211_TX_NO_SEQNO;
+			info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO;
 			hdr->seq_ctrl =
 				cpu_to_le16(IEEE80211_SN_TO_SEQ(sn));
 		}
 		IEEE80211_SKB_CB(skb)->flags |= tx_flags;
-		ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band,
-					  txdata_flags);
+		ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band, 0);
 	}
 }
 

net/mac80211/tx.c

@@ -836,8 +836,6 @@ ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
 	 */
 	if (!ieee80211_is_data_qos(hdr->frame_control) ||
 	    is_multicast_ether_addr(hdr->addr1)) {
-		if (tx->flags & IEEE80211_TX_NO_SEQNO)
-			return TX_CONTINUE;
 		/* driver should assign sequence number */
 		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
 		/* for pure STA mode without beacons, we can do it */