mac80211: handle operating mode notif in beacon/assoc response

In beacons and association response frames an AP may include an
operating mode notification element to advertise changes in the
number of spatial streams it can receive. Handle this using the
existing function that handles the action frame, but only handle
NSS changes, not bandwidth changes which aren't allowed here.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

5 files changed, 38 insertions, 6 deletions

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 4947c91c6c86..892bac64a189 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1197,6 +1197,7 @@ struct ieee802_11_elems {
         u8 *pwr_constr_elem;
         u8 *quiet_elem; /* first quite element */
         u8 *timeout_int;
+        u8 *opmode_notif;
 
         /* length of them, respectively */
         u8 ssid_len;
@@ -1435,7 +1436,7 @@ enum ieee80211_sta_rx_bandwidth ieee80211_sta_cur_vht_bw(struct sta_info *sta);
 void ieee80211_sta_set_rx_nss(struct sta_info *sta);
 void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
                                  struct sta_info *sta, u8 opmode,
-                                 enum ieee80211_band band);
+                                 enum ieee80211_band band, bool nss_only);
 
 /* Spectrum management */
 void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index e6da6bf8cc27..f2c6f7794f35 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -2217,6 +2217,21 @@ static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
                                                   elems.ht_operation,
                                                   cbss->bssid, false);
 
+        /*
+         * If an operating mode notification IE is present, override the
+         * NSS calculation (that would be done in rate_control_rate_init())
+         * and use the # of streams from that element.
+         */
+        if (elems.opmode_notif &&
+            !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
+                u8 nss;
+
+                nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
+                nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
+                nss += 1;
+                sta->sta.rx_nss = nss;
+        }
+
         rate_control_rate_init(sta);
 
         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
@@ -2489,6 +2504,7 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
         struct ieee80211_local *local = sdata->local;
         struct ieee80211_chanctx_conf *chanctx_conf;
         struct ieee80211_channel *chan;
+        struct sta_info *sta;
         u32 changed = 0;
         bool erp_valid;
         u8 erp_value = 0;
@@ -2728,14 +2744,18 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
                         le16_to_cpu(mgmt->u.beacon.capab_info),
                         erp_valid, erp_value);
 
-
         mutex_lock(&local->sta_mtx);
+        sta = sta_info_get(sdata, bssid);
+
         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
             !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
-                changed |= ieee80211_config_ht_tx(sdata,
-                                                  sta_info_get(sdata, bssid),
+                changed |= ieee80211_config_ht_tx(sdata, sta,
                                                   elems.ht_operation,
                                                   bssid, true);
+
+        if (sta && elems.opmode_notif)
+                ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
+                                            rx_status->band, true);
         mutex_unlock(&local->sta_mtx);
 
         if (elems.country_elem && elems.pwr_constr_elem &&
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 1617e0bd4ca6..30f1ba6de8f3 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -2459,7 +2459,8 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
 
                         ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
-                                                    opmode, status->band);
+                                                    opmode, status->band,
+                                                    false);
                         goto handled;
                 }
                 default:
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index b231bc2ed740..e24ff38606a9 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -787,6 +787,12 @@ u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
                         else
                                 elem_parse_failed = true;
                         break;
+                case WLAN_EID_OPMODE_NOTIF:
+                        if (elen > 0)
+                                elems->opmode_notif = pos;
+                        else
+                                elem_parse_failed = true;
+                        break;
                 case WLAN_EID_MESH_ID:
                         elems->mesh_id = pos;
                         elems->mesh_id_len = elen;
diff --git a/net/mac80211/vht.c b/net/mac80211/vht.c
index 0951f74e7ff5..a9549fcc5a04 100644
--- a/net/mac80211/vht.c
+++ b/net/mac80211/vht.c
@@ -141,7 +141,7 @@ void ieee80211_sta_set_rx_nss(struct sta_info *sta)
 
 void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
                                  struct sta_info *sta, u8 opmode,
-                                 enum ieee80211_band band)
+                                 enum ieee80211_band band, bool nss_only)
 {
         struct ieee80211_local *local = sdata->local;
         struct ieee80211_supported_band *sband;
@@ -164,6 +164,9 @@ void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
                 changed |= IEEE80211_RC_NSS_CHANGED;
         }
 
+        if (nss_only)
+                goto change;
+
         switch (opmode & IEEE80211_OPMODE_NOTIF_CHANWIDTH_MASK) {
         case IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ:
                 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_20;
@@ -185,6 +188,7 @@ void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
                 changed |= IEEE80211_RC_NSS_CHANGED;
         }
 
+ change:
         if (changed)
                 rate_control_rate_update(local, sband, sta, changed);
 }