cfg80211: add start / stop NAN commands

This allows user space to start/stop NAN interface.
A NAN interface is like P2P device in a few aspects: it
doesn't have a netdev associated to it.
Add the new interface type and prevent operations that
can't be executed on NAN interface like scan.

Define several attributes that may be configured by user space
when starting NAN functionality (master preference and dual
band operation)

Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/cfg.c

@@ -257,6 +257,7 @@ static int ieee80211_add_key(struct wiphy *wiphy, struct net_device *dev,
 	case NL80211_IFTYPE_WDS:
 	case NL80211_IFTYPE_MONITOR:
 	case NL80211_IFTYPE_P2P_DEVICE:
+	case NL80211_IFTYPE_NAN:
 	case NL80211_IFTYPE_UNSPECIFIED:
 	case NUM_NL80211_IFTYPES:
 	case NL80211_IFTYPE_P2P_CLIENT:
@@ -2036,6 +2037,7 @@ static int ieee80211_scan(struct wiphy *wiphy,
 		     !(req->flags & NL80211_SCAN_FLAG_AP)))
 			return -EOPNOTSUPP;
 		break;
+	case NL80211_IFTYPE_NAN:
 	default:
 		return -EOPNOTSUPP;
 	}

net/mac80211/chan.c

@@ -274,6 +274,7 @@ ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
 				    ieee80211_get_max_required_bw(sdata));
 			break;
 		case NL80211_IFTYPE_P2P_DEVICE:
+		case NL80211_IFTYPE_NAN:
 			continue;
 		case NL80211_IFTYPE_ADHOC:
 		case NL80211_IFTYPE_WDS:
@@ -718,6 +719,7 @@ void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
 
 		switch (sdata->vif.type) {
 		case NL80211_IFTYPE_P2P_DEVICE:
+		case NL80211_IFTYPE_NAN:
 			continue;
 		case NL80211_IFTYPE_STATION:
 			if (!sdata->u.mgd.associated)
@@ -980,6 +982,7 @@ ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata)
 	case NL80211_IFTYPE_P2P_CLIENT:
 	case NL80211_IFTYPE_P2P_GO:
 	case NL80211_IFTYPE_P2P_DEVICE:
+	case NL80211_IFTYPE_NAN:
 	case NUM_NL80211_IFTYPES:
 		WARN_ON(1);
 		break;

net/mac80211/iface.c

@@ -545,6 +545,7 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 	case NL80211_IFTYPE_ADHOC:
 	case NL80211_IFTYPE_P2P_DEVICE:
 	case NL80211_IFTYPE_OCB:
+	case NL80211_IFTYPE_NAN:
 		/* no special treatment */
 		break;
 	case NL80211_IFTYPE_UNSPECIFIED:
@@ -660,6 +661,7 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 			break;
 		case NL80211_IFTYPE_WDS:
 		case NL80211_IFTYPE_P2P_DEVICE:
+		case NL80211_IFTYPE_NAN:
 			break;
 		default:
 			/* not reached */
@@ -948,6 +950,7 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 		/* relies on synchronize_rcu() below */
 		RCU_INIT_POINTER(local->p2p_sdata, NULL);
 		/* fall through */
+	case NL80211_IFTYPE_NAN:
 	default:
 		cancel_work_sync(&sdata->work);
 		/*
@@ -1457,6 +1460,7 @@ static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 		break;
 	case NL80211_IFTYPE_AP_VLAN:
 	case NL80211_IFTYPE_P2P_DEVICE:
+	case NL80211_IFTYPE_NAN:
 		sdata->vif.bss_conf.bssid = sdata->vif.addr;
 		break;
 	case NL80211_IFTYPE_UNSPECIFIED:

net/mac80211/offchannel.c

@@ -838,6 +838,7 @@ int ieee80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
 	case NL80211_IFTYPE_P2P_DEVICE:
 		need_offchan = true;
 		break;
+	case NL80211_IFTYPE_NAN:
 	default:
 		return -EOPNOTSUPP;
 	}

net/mac80211/rx.c

@@ -3586,6 +3586,9 @@ static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
 		       ieee80211_is_probe_req(hdr->frame_control) ||
 		       ieee80211_is_probe_resp(hdr->frame_control) ||
 		       ieee80211_is_beacon(hdr->frame_control);
+	case NL80211_IFTYPE_NAN:
+		/* Currently no frames on NAN interface are allowed */
+		return false;
 	default:
 		break;
 	}

net/mac80211/util.c

@@ -1975,6 +1975,7 @@ int ieee80211_reconfig(struct ieee80211_local *local)
 		case NL80211_IFTYPE_AP_VLAN:
 		case NL80211_IFTYPE_MONITOR:
 		case NL80211_IFTYPE_P2P_DEVICE:
+		case NL80211_IFTYPE_NAN:
 			/* nothing to do */
 			break;
 		case NL80211_IFTYPE_UNSPECIFIED: