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diff --git a/sys/net80211/ieee80211_output.c b/sys/net80211/ieee80211_output.c
--- a/sys/net80211/ieee80211_output.c
+++ b/sys/net80211/ieee80211_output.c
@@ -4195,17 +4195,15 @@
* Check the frame type and TID and assign a suitable sequence number
* from the correct sequence number space.
*
+ * This implements the components of 802.11-2020 10.3.2.14.2
+ * (Transmitter Requirements) that net80211 currently supports.
+ *
* It assumes the mbuf has been encapsulated, and has the TID assigned
* if it is a QoS frame.
*
* Note this also clears any existing fragment ID in the header, so it
* must be called first before assigning fragment IDs.
*
- * For now this implements parts of 802.11-2012; it doesn't do all of
- * the needed checks for full compliance (notably QoS-Data NULL frames).
- *
- * TODO: update to 802.11-2020 10.3.2.14.2 (Transmitter Requirements)
- *
* @param ni ieee80211_node this frame will be transmitted to
* @param arg_tid A temporary check, existing callers may set
* this to a TID variable they were using, and this routine
@@ -4239,16 +4237,29 @@
"%s: called; TID mismatch; tid=%u, arg_tid=%d\n",
__func__, tid, arg_tid);
- if (IEEE80211_HAS_SEQ(type, subtype)) {
- /*
- * 802.11-2012 9.3.2.10 - QoS multicast frames
- * come out of a different seqno space.
- */
- if (IEEE80211_IS_MULTICAST(wh->i_addr1))
- seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++;
- else
- seqno = ni->ni_txseqs[tid]++;
- } else
+
+ /* 802.11-2020 10.3.2.14.2 (Transmitter Requirements) sections */
+
+ /* SNS7 - unicast PV1 management frame */
+
+ /* SNS6 - unicast PV1 data frame */
+
+ /* SNS5 - QoS NULL frames */
+ if (IEEE80211_QOS_HAS_SEQ(wh) && IEEE80211_IS_QOS_NULL(wh))
+ seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++;
+
+ /* SNS4 - QMF STA transmitting a QMF */
+
+ /* SNS3 - QoS STA; Time Priority Management frame */
+
+ /* SNS2 - unicast QoS STA, data frame, excluding SNS5 */
+ else if (IEEE80211_QOS_HAS_SEQ(wh))
+ seqno = ni->ni_txseqs[tid]++;
+
+ /* SNS1 - Baseline (everything else) */
+ else if (IEEE80211_HAS_SEQ(type, subtype))
+ seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++;
+ else
seqno = 0;
/*

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