Merge remote-tracking branch 'mac80211/master' into HEAD

Merge mac80211 to avoid conflicts with the nl80211 attrbuf
changes.

Conflicts:
	net/mac80211/iface.c
	net/wireless/nl80211.c

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

1 files changed, 80 insertions, 7 deletions

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index e0939eb..34d54fe 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -2502,8 +2502,11 @@ static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
 	u16 capab_info, aid;
 	struct ieee802_11_elems elems;
 	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
+	const struct cfg80211_bss_ies *bss_ies = NULL;
+	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 	u32 changed = 0;
 	int err;
+	bool ret;
 
 	/* AssocResp and ReassocResp have identical structure */
 
@@ -2535,21 +2538,86 @@ static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
 	ifmgd->aid = aid;
 
 	/*
+	 * Some APs are erroneously not including some information in their
+	 * (re)association response frames. Try to recover by using the data
+	 * from the beacon or probe response. This seems to afflict mobile
+	 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
+	 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
+	 */
+	if ((assoc_data->wmm && !elems.wmm_param) ||
+	    (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
+	     (!elems.ht_cap_elem || !elems.ht_operation)) ||
+	    (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
+	     (!elems.vht_cap_elem || !elems.vht_operation))) {
+		const struct cfg80211_bss_ies *ies;
+		struct ieee802_11_elems bss_elems;
+
+		rcu_read_lock();
+		ies = rcu_dereference(cbss->ies);
+		if (ies)
+			bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
+					  GFP_ATOMIC);
+		rcu_read_unlock();
+		if (!bss_ies)
+			return false;
+
+		ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
+				       false, &bss_elems);
+		if (assoc_data->wmm &&
+		    !elems.wmm_param && bss_elems.wmm_param) {
+			elems.wmm_param = bss_elems.wmm_param;
+			sdata_info(sdata,
+				   "AP bug: WMM param missing from AssocResp\n");
+		}
+
+		/*
+		 * Also check if we requested HT/VHT, otherwise the AP doesn't
+		 * have to include the IEs in the (re)association response.
+		 */
+		if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
+		    !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
+			elems.ht_cap_elem = bss_elems.ht_cap_elem;
+			sdata_info(sdata,
+				   "AP bug: HT capability missing from AssocResp\n");
+		}
+		if (!elems.ht_operation && bss_elems.ht_operation &&
+		    !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
+			elems.ht_operation = bss_elems.ht_operation;
+			sdata_info(sdata,
+				   "AP bug: HT operation missing from AssocResp\n");
+		}
+		if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
+		    !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
+			elems.vht_cap_elem = bss_elems.vht_cap_elem;
+			sdata_info(sdata,
+				   "AP bug: VHT capa missing from AssocResp\n");
+		}
+		if (!elems.vht_operation && bss_elems.vht_operation &&
+		    !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
+			elems.vht_operation = bss_elems.vht_operation;
+			sdata_info(sdata,
+				   "AP bug: VHT operation missing from AssocResp\n");
+		}
+	}
+
+	/*
 	 * We previously checked these in the beacon/probe response, so
 	 * they should be present here. This is just a safety net.
 	 */
 	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 	    (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
 		sdata_info(sdata,
-			   "HT AP is missing WMM params or HT capability/operation in AssocResp\n");
-		return false;
+			   "HT AP is missing WMM params or HT capability/operation\n");
+		ret = false;
+		goto out;
 	}
 
 	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
 	    (!elems.vht_cap_elem || !elems.vht_operation)) {
 		sdata_info(sdata,
-			   "VHT AP is missing VHT capability/operation in AssocResp\n");
-		return false;
+			   "VHT AP is missing VHT capability/operation\n");
+		ret = false;
+		goto out;
 	}
 
 	mutex_lock(&sdata->local->sta_mtx);
@@ -2560,7 +2628,8 @@ static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
 	sta = sta_info_get(sdata, cbss->bssid);
 	if (WARN_ON(!sta)) {
 		mutex_unlock(&sdata->local->sta_mtx);
-		return false;
+		ret = false;
+		goto out;
 	}
 
 	sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
@@ -2613,7 +2682,8 @@ static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
 			   sta->sta.addr);
 		WARN_ON(__sta_info_destroy(sta));
 		mutex_unlock(&sdata->local->sta_mtx);
-		return false;
+		ret = false;
+		goto out;
 	}
 
 	mutex_unlock(&sdata->local->sta_mtx);
@@ -2653,7 +2723,10 @@ static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
 	ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
 	ieee80211_sta_reset_beacon_monitor(sdata);
 
-	return true;
+	ret = true;
+ out:
+	kfree(bss_ies);
+	return ret;
 }
 
 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,