mac80211: handle protection mode, RIFS and ADDBA for HT IBSS
* Follow 802.11n-2009 9.13.3.1 for protection mode and ADDBA
* Send ADDBA only to HT STAs - implement 11.5.1.1 partially
Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c
index 2c2e951..9bfe28c 100644
--- a/net/mac80211/agg-tx.c
+++ b/net/mac80211/agg-tx.c
@@ -430,6 +430,27 @@
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 */
diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index 7d84af7..a82f6b4 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -896,6 +896,7 @@
struct cfg80211_ibss_params *params)
{
struct sk_buff *skb;
+ u32 changed = 0;
skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
36 /* bitrates */ +
@@ -951,6 +952,23 @@
ieee80211_recalc_idle(sdata->local);
mutex_unlock(&sdata->local->mtx);
+ /*
+ * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
+ * reserved, but an HT STA shall protect HT transmissions as though
+ * the HT Protection field were set to non-HT mixed mode.
+ *
+ * In an IBSS, the RIFS Mode field of the HT Operation element is
+ * also reserved, but an HT STA shall operate as though this field
+ * were set to 1.
+ */
+
+ sdata->vif.bss_conf.ht_operation_mode |=
+ IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
+ | IEEE80211_HT_PARAM_RIFS_MODE;
+
+ changed |= BSS_CHANGED_HT;
+ ieee80211_bss_info_change_notify(sdata, changed);
+
ieee80211_queue_work(&sdata->local->hw, &sdata->work);
return 0;
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 5243c2c..ac7ea29 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -1587,6 +1587,11 @@
}
if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)
ht_info->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
+
+ /*
+ * Note: According to 802.11n-2009 9.13.3.1, HT Protection field and
+ * RIFS Mode are reserved in IBSS mode, therefore keep them at 0
+ */
ht_info->operation_mode = 0x0000;
ht_info->stbc_param = 0x0000;