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-rw-r--r--net/mac80211/agg-tx.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c
index 2c2e9519a2e..9bfe28c9ab5 100644
--- a/net/mac80211/agg-tx.c
+++ b/net/mac80211/agg-tx.c
@@ -430,6 +430,27 @@ int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid,
return -EINVAL;
}
+ /*
+ * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a
+ * member of an IBSS, and has no other existing Block Ack agreement
+ * with the recipient STA, then the initiating STA shall transmit a
+ * Probe Request frame to the recipient STA and shall not transmit an
+ * ADDBA Request frame unless it receives a Probe Response frame
+ * from the recipient within dot11ADDBAFailureTimeout.
+ *
+ * The probe request mechanism for ADDBA is currently not implemented,
+ * but we only build up Block Ack session with HT STAs. This information
+ * is set when we receive a bss info from a probe response or a beacon.
+ */
+ if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC &&
+ !sta->sta.ht_cap.ht_supported) {
+#ifdef CONFIG_MAC80211_HT_DEBUG
+ printk(KERN_DEBUG "BA request denied - IBSS STA %pM"
+ "does not advertise HT support\n", pubsta->addr);
+#endif /* CONFIG_MAC80211_HT_DEBUG */
+ return -EINVAL;
+ }
+
spin_lock_bh(&sta->lock);
/* we have tried too many times, receiver does not want A-MPDU */