Merge tag 'mac80211-next-for-net-next-2022-01-04' of...

Merge tag 'mac80211-next-for-net-next-2022-01-04' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next

Johannes Berg says:

====================
Just a few more changes:
 - mac80211: allow non-standard VHT MCSes 10/11
 - mac80211: add sleepable station iterator for drivers
 - nl80211: clarify a comment
 - mac80211: small cleanup to use typed element helpers

* tag 'mac80211-next-for-net-next-2022-01-04' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next:
  mac80211: use ieee80211_bss_get_elem()
  nl80211: clarify comment for mesh PLINK_BLOCKED state
  mac80211: Add stations iterator where the iterator function may sleep
  mac80211: allow non-standard VHT MCS-10/11
====================

Link: https://lore.kernel.org/r/20220104153403.69749-1-johannes@sipsolutions.netSigned-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/mac80211.h

@@ -5614,6 +5614,9 @@ void ieee80211_iterate_active_interfaces_atomic(struct ieee80211_hw *hw,
  * This function iterates over the interfaces associated with a given
  * hardware that are currently active and calls the callback for them.
  * This version can only be used while holding the wiphy mutex.
+ * The driver must not call this with a lock held that it can also take in
+ * response to callbacks from mac80211, and it must not call this within
+ * callbacks made by mac80211 - both would result in deadlocks.
  *
  * @hw: the hardware struct of which the interfaces should be iterated over
  * @iter_flags: iteration flags, see &enum ieee80211_interface_iteration_flags
@@ -5627,6 +5630,24 @@ void ieee80211_iterate_active_interfaces_mtx(struct ieee80211_hw *hw,
 						struct ieee80211_vif *vif),
 					     void *data);
 
+/**
+ * ieee80211_iterate_stations - iterate stations
+ *
+ * This function iterates over all stations associated with a given
+ * hardware that are currently uploaded to the driver and calls the callback
+ * function for them.
+ * This function allows the iterator function to sleep, when the iterator
+ * function is atomic @ieee80211_iterate_stations_atomic can be used.
+ *
+ * @hw: the hardware struct of which the interfaces should be iterated over
+ * @iterator: the iterator function to call, cannot sleep
+ * @data: first argument of the iterator function
+ */
+void ieee80211_iterate_stations(struct ieee80211_hw *hw,
+				void (*iterator)(void *data,
+						 struct ieee80211_sta *sta),
+				void *data);
+
 /**
  * ieee80211_iterate_stations_atomic - iterate stations
  *

include/uapi/linux/nl80211.h

@@ -5623,7 +5623,7 @@ enum nl80211_if_combination_attrs {
  * @NL80211_PLINK_ESTAB: mesh peer link is established
  * @NL80211_PLINK_HOLDING: mesh peer link is being closed or cancelled
  * @NL80211_PLINK_BLOCKED: all frames transmitted from this mesh
- *	plink are discarded
+ *	plink are discarded, except for authentication frames
  * @NUM_NL80211_PLINK_STATES: number of peer link states
  * @MAX_NL80211_PLINK_STATES: highest numerical value of plink states
  */

net/mac80211/mlme.c

@@ -4906,7 +4906,7 @@ static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
 				     struct cfg80211_bss *cbss)
 {
 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
-	const u8 *ht_cap_ie, *vht_cap_ie;
+	const struct element *ht_cap_elem, *vht_cap_elem;
 	const struct ieee80211_ht_cap *ht_cap;
 	const struct ieee80211_vht_cap *vht_cap;
 	u8 chains = 1;
@@ -4914,9 +4914,9 @@ static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
 	if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
 		return chains;
 
-	ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
-	if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
-		ht_cap = (void *)(ht_cap_ie + 2);
+	ht_cap_elem = ieee80211_bss_get_elem(cbss, WLAN_EID_HT_CAPABILITY);
+	if (ht_cap_elem && ht_cap_elem->datalen >= sizeof(*ht_cap)) {
+		ht_cap = (void *)ht_cap_elem->data;
 		chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
 		/*
 		 * TODO: use "Tx Maximum Number Spatial Streams Supported" and
@@ -4927,12 +4927,12 @@ static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
 	if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 		return chains;
 
-	vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
-	if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
+	vht_cap_elem = ieee80211_bss_get_elem(cbss, WLAN_EID_VHT_CAPABILITY);
+	if (vht_cap_elem && vht_cap_elem->datalen >= sizeof(*vht_cap)) {
 		u8 nss;
 		u16 tx_mcs_map;
 
-		vht_cap = (void *)(vht_cap_ie + 2);
+		vht_cap = (void *)vht_cap_elem->data;
 		tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
 		for (nss = 8; nss > 0; nss--) {
 			if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=

net/mac80211/rx.c

@@ -4929,7 +4929,7 @@ void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
 				goto drop;
 			break;
 		case RX_ENC_VHT:
-			if (WARN_ONCE(status->rate_idx > 9 ||
+			if (WARN_ONCE(status->rate_idx > 11 ||
 				      !status->nss ||
 				      status->nss > 8,
 				      "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",

net/mac80211/util.c

@@ -862,6 +862,19 @@ static void __iterate_stations(struct ieee80211_local *local,
 	}
 }
 
+void ieee80211_iterate_stations(struct ieee80211_hw *hw,
+				void (*iterator)(void *data,
+						 struct ieee80211_sta *sta),
+				void *data)
+{
+	struct ieee80211_local *local = hw_to_local(hw);
+
+	mutex_lock(&local->sta_mtx);
+	__iterate_stations(local, iterator, data);
+	mutex_unlock(&local->sta_mtx);
+}
+EXPORT_SYMBOL_GPL(ieee80211_iterate_stations);
+
 void ieee80211_iterate_stations_atomic(struct ieee80211_hw *hw,
 			void (*iterator)(void *data,
 					 struct ieee80211_sta *sta),