From 8dcf011ab05bf1fdd9323a9c460bdd0e325b99e1 Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Sat, 26 Jan 2013 22:16:08 +0100
Subject: cfg80211: add SME state to warning in __cfg80211_mlme_disassoc

The warning here occasionally triggers but we haven't
found the cause yet. It's a valid warning since if it
triggers the SME state got confused, so add the SME
state to it to help narrow it down in the future.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 net/wireless/mlme.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'net/wireless/mlme.c')

diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index 461e692cdfec..fee9bf70efcf 100644
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -514,7 +514,7 @@ static int __cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
 	if (wdev->sme_state != CFG80211_SME_CONNECTED)
 		return -ENOTCONN;
 
-	if (WARN_ON(!wdev->current_bss))
+	if (WARN(!wdev->current_bss, "sme_state=%d\n", wdev->sme_state))
 		return -ENOTCONN;
 
 	memset(&req, 0, sizeof(req));
-- 
cgit v1.2.3


From 5b112d3d098c97b867cc580f590395cd1e72f18c Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Fri, 1 Feb 2013 01:49:58 +0100
Subject: cfg80211: pass wiphy to cfg80211_ref_bss/put_bss

This prepares for using the spinlock instead of krefs
which is needed in the next patch to track the refs
of combined BSSes correctly.

Acked-by: Bing Zhao <bzhao@marvell.com> [mwifiex]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 drivers/net/wireless/ath/ath6kl/cfg80211.c            |  4 ++--
 drivers/net/wireless/ath/ath6kl/wmi.c                 |  2 +-
 drivers/net/wireless/ath/wil6210/cfg80211.c           |  2 +-
 drivers/net/wireless/ath/wil6210/wmi.c                |  2 +-
 drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c |  4 ++--
 drivers/net/wireless/libertas/cfg.c                   |  8 ++++----
 drivers/net/wireless/mwifiex/cfg80211.c               |  2 +-
 drivers/net/wireless/mwifiex/scan.c                   |  2 +-
 drivers/net/wireless/mwifiex/sta_ioctl.c              |  4 ++--
 drivers/net/wireless/orinoco/scan.c                   |  4 ++--
 drivers/net/wireless/rndis_wlan.c                     |  4 ++--
 drivers/staging/wlan-ng/cfg80211.c                    |  2 +-
 include/net/cfg80211.h                                |  6 ++++--
 net/mac80211/ibss.c                                   |  4 ++--
 net/mac80211/mlme.c                                   |  6 +++---
 net/mac80211/scan.c                                   |  3 ++-
 net/wireless/core.c                                   |  2 +-
 net/wireless/ibss.c                                   |  4 ++--
 net/wireless/mlme.c                                   | 14 +++++++-------
 net/wireless/scan.c                                   |  4 ++--
 net/wireless/sme.c                                    | 16 ++++++++--------
 21 files changed, 51 insertions(+), 48 deletions(-)

(limited to 'net/wireless/mlme.c')

diff --git a/drivers/net/wireless/ath/ath6kl/cfg80211.c b/drivers/net/wireless/ath/ath6kl/cfg80211.c
index 4225cca0f198..a7fb442a99aa 100644
--- a/drivers/net/wireless/ath/ath6kl/cfg80211.c
+++ b/drivers/net/wireless/ath/ath6kl/cfg80211.c
@@ -767,7 +767,7 @@ void ath6kl_cfg80211_connect_event(struct ath6kl_vif *vif, u16 channel,
 		ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "ad-hoc %s selected\n",
 			   nw_type & ADHOC_CREATOR ? "creator" : "joiner");
 		cfg80211_ibss_joined(vif->ndev, bssid, GFP_KERNEL);
-		cfg80211_put_bss(bss);
+		cfg80211_put_bss(ar->wiphy, bss);
 		return;
 	}
 
@@ -778,7 +778,7 @@ void ath6kl_cfg80211_connect_event(struct ath6kl_vif *vif, u16 channel,
 					assoc_req_ie, assoc_req_len,
 					assoc_resp_ie, assoc_resp_len,
 					WLAN_STATUS_SUCCESS, GFP_KERNEL);
-		cfg80211_put_bss(bss);
+		cfg80211_put_bss(ar->wiphy, bss);
 	} else if (vif->sme_state == SME_CONNECTED) {
 		/* inform roam event to cfg80211 */
 		cfg80211_roamed_bss(vif->ndev, bss, assoc_req_ie, assoc_req_len,
diff --git a/drivers/net/wireless/ath/ath6kl/wmi.c b/drivers/net/wireless/ath/ath6kl/wmi.c
index 998f8b0f62fd..d366cf105c7c 100644
--- a/drivers/net/wireless/ath/ath6kl/wmi.c
+++ b/drivers/net/wireless/ath/ath6kl/wmi.c
@@ -1108,7 +1108,7 @@ static int ath6kl_wmi_bssinfo_event_rx(struct wmi *wmi, u8 *datap, int len,
 	kfree(mgmt);
 	if (bss == NULL)
 		return -ENOMEM;
-	cfg80211_put_bss(bss);
+	cfg80211_put_bss(ar->wiphy, bss);
 
 	/*
 	 * Firmware doesn't return any event when scheduled scan has
diff --git a/drivers/net/wireless/ath/wil6210/cfg80211.c b/drivers/net/wireless/ath/wil6210/cfg80211.c
index 002851fceb2f..9ecc1968262c 100644
--- a/drivers/net/wireless/ath/wil6210/cfg80211.c
+++ b/drivers/net/wireless/ath/wil6210/cfg80211.c
@@ -341,7 +341,7 @@ static int wil_cfg80211_connect(struct wiphy *wiphy,
 	}
 
  out:
-	cfg80211_put_bss(bss);
+	cfg80211_put_bss(wiphy, bss);
 
 	return rc;
 }
diff --git a/drivers/net/wireless/ath/wil6210/wmi.c b/drivers/net/wireless/ath/wil6210/wmi.c
index 0b70e17cd1fb..79d608caa903 100644
--- a/drivers/net/wireless/ath/wil6210/wmi.c
+++ b/drivers/net/wireless/ath/wil6210/wmi.c
@@ -338,7 +338,7 @@ static void wmi_evt_rx_mgmt(struct wil6210_priv *wil, int id, void *d, int len)
 		if (bss) {
 			wil_dbg_wmi(wil, "Added BSS %pM\n",
 				    rx_mgmt_frame->bssid);
-			cfg80211_put_bss(bss);
+			cfg80211_put_bss(wiphy, bss);
 		} else {
 			wil_err(wil, "cfg80211_inform_bss() failed\n");
 		}
diff --git a/drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c b/drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c
index 481f41ad7989..cecc3eff72e9 100644
--- a/drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c
@@ -2323,7 +2323,7 @@ static s32 brcmf_inform_single_bss(struct brcmf_cfg80211_info *cfg,
 	if (!bss)
 		return -ENOMEM;
 
-	cfg80211_put_bss(bss);
+	cfg80211_put_bss(wiphy, bss);
 
 	return err;
 }
@@ -2429,7 +2429,7 @@ static s32 wl_inform_ibss(struct brcmf_cfg80211_info *cfg,
 		goto CleanUp;
 	}
 
-	cfg80211_put_bss(bss);
+	cfg80211_put_bss(wiphy, bss);
 
 CleanUp:
 
diff --git a/drivers/net/wireless/libertas/cfg.c b/drivers/net/wireless/libertas/cfg.c
index 230f8ebbe289..61735db3b051 100644
--- a/drivers/net/wireless/libertas/cfg.c
+++ b/drivers/net/wireless/libertas/cfg.c
@@ -657,7 +657,7 @@ static int lbs_ret_scan(struct lbs_private *priv, unsigned long dummy,
 					capa, intvl, ie, ielen,
 					LBS_SCAN_RSSI_TO_MBM(rssi),
 					GFP_KERNEL);
-				cfg80211_put_bss(bss);
+				cfg80211_put_bss(wiphy, bss);
 			}
 		} else
 			lbs_deb_scan("scan response: missing BSS channel IE\n");
@@ -1444,7 +1444,7 @@ static int lbs_cfg_connect(struct wiphy *wiphy, struct net_device *dev,
 
  done:
 	if (bss)
-		cfg80211_put_bss(bss);
+		cfg80211_put_bss(wiphy, bss);
 	lbs_deb_leave_args(LBS_DEB_CFG80211, "ret %d", ret);
 	return ret;
 }
@@ -1766,7 +1766,7 @@ static void lbs_join_post(struct lbs_private *priv,
 				  params->beacon_interval,
 				  fake_ie, fake - fake_ie,
 				  0, GFP_KERNEL);
-	cfg80211_put_bss(bss);
+	cfg80211_put_bss(priv->wdev->wiphy, bss);
 
 	memcpy(priv->wdev->ssid, params->ssid, params->ssid_len);
 	priv->wdev->ssid_len = params->ssid_len;
@@ -2011,7 +2011,7 @@ static int lbs_join_ibss(struct wiphy *wiphy, struct net_device *dev,
 
 	if (bss) {
 		ret = lbs_ibss_join_existing(priv, params, bss);
-		cfg80211_put_bss(bss);
+		cfg80211_put_bss(wiphy, bss);
 	} else
 		ret = lbs_ibss_start_new(priv, params);
 
diff --git a/drivers/net/wireless/mwifiex/cfg80211.c b/drivers/net/wireless/mwifiex/cfg80211.c
index 3a004b85b99f..81c84a29308f 100644
--- a/drivers/net/wireless/mwifiex/cfg80211.c
+++ b/drivers/net/wireless/mwifiex/cfg80211.c
@@ -1430,7 +1430,7 @@ static int mwifiex_cfg80211_inform_ibss_bss(struct mwifiex_private *priv)
 	bss = cfg80211_inform_bss(priv->wdev->wiphy, chan,
 				  bss_info.bssid, 0, WLAN_CAPABILITY_IBSS,
 				  0, ie_buf, ie_len, 0, GFP_KERNEL);
-	cfg80211_put_bss(bss);
+	cfg80211_put_bss(priv->wdev->wiphy, bss);
 	memcpy(priv->cfg_bssid, bss_info.bssid, ETH_ALEN);
 
 	return 0;
diff --git a/drivers/net/wireless/mwifiex/scan.c b/drivers/net/wireless/mwifiex/scan.c
index 9189a32b7844..232492487527 100644
--- a/drivers/net/wireless/mwifiex/scan.c
+++ b/drivers/net/wireless/mwifiex/scan.c
@@ -1746,7 +1746,7 @@ int mwifiex_ret_802_11_scan(struct mwifiex_private *priv,
 					    .mac_address, ETH_ALEN))
 					mwifiex_update_curr_bss_params(priv,
 								       bss);
-				cfg80211_put_bss(bss);
+				cfg80211_put_bss(priv->wdev->wiphy, bss);
 			}
 		} else {
 			dev_dbg(adapter->dev, "missing BSS channel IE\n");
diff --git a/drivers/net/wireless/mwifiex/sta_ioctl.c b/drivers/net/wireless/mwifiex/sta_ioctl.c
index f542bb8ccbc8..ee85b41a4dfd 100644
--- a/drivers/net/wireless/mwifiex/sta_ioctl.c
+++ b/drivers/net/wireless/mwifiex/sta_ioctl.c
@@ -324,7 +324,7 @@ int mwifiex_bss_start(struct mwifiex_private *priv, struct cfg80211_bss *bss,
 		}
 
 		if (bss)
-			cfg80211_put_bss(bss);
+			cfg80211_put_bss(priv->adapter->wiphy, bss);
 	} else {
 		/* Adhoc mode */
 		/* If the requested SSID matches current SSID, return */
@@ -354,7 +354,7 @@ int mwifiex_bss_start(struct mwifiex_private *priv, struct cfg80211_bss *bss,
 							" list. Joining...\n");
 			ret = mwifiex_adhoc_join(priv, bss_desc);
 			if (bss)
-				cfg80211_put_bss(bss);
+				cfg80211_put_bss(priv->adapter->wiphy, bss);
 		} else {
 			dev_dbg(adapter->dev, "info: Network not found in "
 				"the list, creating adhoc with ssid = %s\n",
diff --git a/drivers/net/wireless/orinoco/scan.c b/drivers/net/wireless/orinoco/scan.c
index 96e39edfec77..e8c5714bfd11 100644
--- a/drivers/net/wireless/orinoco/scan.c
+++ b/drivers/net/wireless/orinoco/scan.c
@@ -125,7 +125,7 @@ static void orinoco_add_hostscan_result(struct orinoco_private *priv,
 	cbss = cfg80211_inform_bss(wiphy, channel, bss->a.bssid, timestamp,
 				   capability, beacon_interval, ie_buf, ie_len,
 				   signal, GFP_KERNEL);
-	cfg80211_put_bss(cbss);
+	cfg80211_put_bss(wiphy, cbss);
 }
 
 void orinoco_add_extscan_result(struct orinoco_private *priv,
@@ -158,7 +158,7 @@ void orinoco_add_extscan_result(struct orinoco_private *priv,
 	cbss = cfg80211_inform_bss(wiphy, channel, bss->bssid, timestamp,
 				   capability, beacon_interval, ie, ie_len,
 				   signal, GFP_KERNEL);
-	cfg80211_put_bss(cbss);
+	cfg80211_put_bss(wiphy, cbss);
 }
 
 void orinoco_add_hostscan_results(struct orinoco_private *priv,
diff --git a/drivers/net/wireless/rndis_wlan.c b/drivers/net/wireless/rndis_wlan.c
index abe1d039be81..fe2f272689aa 100644
--- a/drivers/net/wireless/rndis_wlan.c
+++ b/drivers/net/wireless/rndis_wlan.c
@@ -2029,7 +2029,7 @@ static bool rndis_bss_info_update(struct usbnet *usbdev,
 	bss = cfg80211_inform_bss(priv->wdev.wiphy, channel, bssid->mac,
 		timestamp, capability, beacon_interval, ie, ie_len, signal,
 		GFP_KERNEL);
-	cfg80211_put_bss(bss);
+	cfg80211_put_bss(priv->wdev.wiphy, bss);
 
 	return (bss != NULL);
 }
@@ -2718,7 +2718,7 @@ static void rndis_wlan_craft_connected_bss(struct usbnet *usbdev, u8 *bssid,
 	bss = cfg80211_inform_bss(priv->wdev.wiphy, channel, bssid,
 		timestamp, capability, beacon_period, ie_buf, ie_len,
 		signal, GFP_KERNEL);
-	cfg80211_put_bss(bss);
+	cfg80211_put_bss(priv->wdev.wiphy, bss);
 }
 
 /*
diff --git a/drivers/staging/wlan-ng/cfg80211.c b/drivers/staging/wlan-ng/cfg80211.c
index 18c06a59c091..a233f64ca22f 100644
--- a/drivers/staging/wlan-ng/cfg80211.c
+++ b/drivers/staging/wlan-ng/cfg80211.c
@@ -424,7 +424,7 @@ int prism2_scan(struct wiphy *wiphy, struct cfg80211_scan_request *request)
 			goto exit;
 		}
 
-		cfg80211_put_bss(bss);
+		cfg80211_put_bss(wiphy, bss);
 	}
 
 	if (result)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 3ec70e1681d3..691b347545cb 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -3166,19 +3166,21 @@ cfg80211_get_ibss(struct wiphy *wiphy,
 
 /**
  * cfg80211_ref_bss - reference BSS struct
+ * @wiphy: the wiphy this BSS struct belongs to
  * @bss: the BSS struct to reference
  *
  * Increments the refcount of the given BSS struct.
  */
-void cfg80211_ref_bss(struct cfg80211_bss *bss);
+void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *bss);
 
 /**
  * cfg80211_put_bss - unref BSS struct
+ * @wiphy: the wiphy this BSS struct belongs to
  * @bss: the BSS struct
  *
  * Decrements the refcount of the given BSS struct.
  */
-void cfg80211_put_bss(struct cfg80211_bss *bss);
+void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *bss);
 
 /**
  * cfg80211_unlink_bss - unlink BSS from internal data structures
diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index a54c8248e0e0..71c55cc0f7b6 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -228,7 +228,7 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 
 	bss = cfg80211_inform_bss_frame(local->hw.wiphy, chan,
 					mgmt, skb->len, 0, GFP_KERNEL);
-	cfg80211_put_bss(bss);
+	cfg80211_put_bss(local->hw.wiphy, bss);
 	netif_carrier_on(sdata->dev);
 	cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
 }
@@ -1159,7 +1159,7 @@ int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
 
 		if (cbss) {
 			cfg80211_unlink_bss(local->hw.wiphy, cbss);
-			cfg80211_put_bss(cbss);
+			cfg80211_put_bss(local->hw.wiphy, cbss);
 		}
 	}
 
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 353b690900e9..15f2edd08a95 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -1934,7 +1934,7 @@ static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
 		ieee80211_vif_release_channel(sdata);
 	}
 
-	cfg80211_put_bss(auth_data->bss);
+	cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
 	kfree(auth_data);
 	sdata->u.mgd.auth_data = NULL;
 }
@@ -2387,7 +2387,7 @@ ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
 		if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
 			/* oops -- internal error -- send timeout for now */
 			ieee80211_destroy_assoc_data(sdata, false);
-			cfg80211_put_bss(*bss);
+			cfg80211_put_bss(sdata->local->hw.wiphy, *bss);
 			return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
 		}
 		sdata_info(sdata, "associated\n");
@@ -3831,7 +3831,7 @@ int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
 	}
 
 	/* hold our own reference */
-	cfg80211_ref_bss(auth_data->bss);
+	cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
 	err = 0;
 	goto out_unlock;
 
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 7f80f0a5026e..400153f7f21f 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -34,7 +34,8 @@ void ieee80211_rx_bss_put(struct ieee80211_local *local,
 {
 	if (!bss)
 		return;
-	cfg80211_put_bss(container_of((void *)bss, struct cfg80211_bss, priv));
+	cfg80211_put_bss(local->hw.wiphy,
+			 container_of((void *)bss, struct cfg80211_bss, priv));
 }
 
 static bool is_uapsd_supported(struct ieee802_11_elems *elems)
diff --git a/net/wireless/core.c b/net/wireless/core.c
index ce827242f390..f0a1bbe95cff 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -715,7 +715,7 @@ void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
 		kfree(reg);
 	}
 	list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
-		cfg80211_put_bss(&scan->pub);
+		cfg80211_put_bss(&rdev->wiphy, &scan->pub);
 	kfree(rdev);
 }
 
diff --git a/net/wireless/ibss.c b/net/wireless/ibss.c
index 9b9551e4a6f9..d80e47194d49 100644
--- a/net/wireless/ibss.c
+++ b/net/wireless/ibss.c
@@ -37,7 +37,7 @@ void __cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid)
 
 	if (wdev->current_bss) {
 		cfg80211_unhold_bss(wdev->current_bss);
-		cfg80211_put_bss(&wdev->current_bss->pub);
+		cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 	}
 
 	cfg80211_hold_bss(bss_from_pub(bss));
@@ -182,7 +182,7 @@ static void __cfg80211_clear_ibss(struct net_device *dev, bool nowext)
 
 	if (wdev->current_bss) {
 		cfg80211_unhold_bss(wdev->current_bss);
-		cfg80211_put_bss(&wdev->current_bss->pub);
+		cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 	}
 
 	wdev->current_bss = NULL;
diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index fee9bf70efcf..8e6920728c43 100644
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -58,7 +58,7 @@ void cfg80211_send_rx_assoc(struct net_device *dev, struct cfg80211_bss *bss,
 	 */
 	if (status_code != WLAN_STATUS_SUCCESS && wdev->conn &&
 	    cfg80211_sme_failed_reassoc(wdev)) {
-		cfg80211_put_bss(bss);
+		cfg80211_put_bss(wiphy, bss);
 		goto out;
 	}
 
@@ -70,7 +70,7 @@ void cfg80211_send_rx_assoc(struct net_device *dev, struct cfg80211_bss *bss,
 		 * do not call connect_result() now because the
 		 * sme will schedule work that does it later.
 		 */
-		cfg80211_put_bss(bss);
+		cfg80211_put_bss(wiphy, bss);
 		goto out;
 	}
 
@@ -108,7 +108,7 @@ void __cfg80211_send_deauth(struct net_device *dev,
 	if (wdev->current_bss &&
 	    ether_addr_equal(wdev->current_bss->pub.bssid, bssid)) {
 		cfg80211_unhold_bss(wdev->current_bss);
-		cfg80211_put_bss(&wdev->current_bss->pub);
+		cfg80211_put_bss(wiphy, &wdev->current_bss->pub);
 		wdev->current_bss = NULL;
 		was_current = true;
 	}
@@ -164,7 +164,7 @@ void __cfg80211_send_disassoc(struct net_device *dev,
 	    ether_addr_equal(wdev->current_bss->pub.bssid, bssid)) {
 		cfg80211_sme_disassoc(dev, wdev->current_bss);
 		cfg80211_unhold_bss(wdev->current_bss);
-		cfg80211_put_bss(&wdev->current_bss->pub);
+		cfg80211_put_bss(wiphy, &wdev->current_bss->pub);
 		wdev->current_bss = NULL;
 	} else
 		WARN_ON(1);
@@ -324,7 +324,7 @@ int __cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 	err = rdev_auth(rdev, dev, &req);
 
 out:
-	cfg80211_put_bss(req.bss);
+	cfg80211_put_bss(&rdev->wiphy, req.bss);
 	return err;
 }
 
@@ -432,7 +432,7 @@ out:
 	if (err) {
 		if (was_connected)
 			wdev->sme_state = CFG80211_SME_CONNECTED;
-		cfg80211_put_bss(req.bss);
+		cfg80211_put_bss(&rdev->wiphy, req.bss);
 	}
 
 	return err;
@@ -572,7 +572,7 @@ void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
 
 	if (wdev->current_bss) {
 		cfg80211_unhold_bss(wdev->current_bss);
-		cfg80211_put_bss(&wdev->current_bss->pub);
+		cfg80211_put_bss(&rdev->wiphy, &wdev->current_bss->pub);
 		wdev->current_bss = NULL;
 	}
 }
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 36daacb31788..dacb44ac2f74 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -818,7 +818,7 @@ cfg80211_inform_bss_frame(struct wiphy *wiphy,
 }
 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
 
-void cfg80211_ref_bss(struct cfg80211_bss *pub)
+void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
 {
 	struct cfg80211_internal_bss *bss;
 
@@ -830,7 +830,7 @@ void cfg80211_ref_bss(struct cfg80211_bss *pub)
 }
 EXPORT_SYMBOL(cfg80211_ref_bss);
 
-void cfg80211_put_bss(struct cfg80211_bss *pub)
+void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
 {
 	struct cfg80211_internal_bss *bss;
 
diff --git a/net/wireless/sme.c b/net/wireless/sme.c
index a825dfe12cf7..f432bd3755b1 100644
--- a/net/wireless/sme.c
+++ b/net/wireless/sme.c
@@ -301,7 +301,7 @@ static void __cfg80211_sme_scan_done(struct net_device *dev)
 
 	bss = cfg80211_get_conn_bss(wdev);
 	if (bss) {
-		cfg80211_put_bss(bss);
+		cfg80211_put_bss(&rdev->wiphy, bss);
 	} else {
 		/* not found */
 		if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
@@ -464,7 +464,7 @@ void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 
 	if (wdev->current_bss) {
 		cfg80211_unhold_bss(wdev->current_bss);
-		cfg80211_put_bss(&wdev->current_bss->pub);
+		cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 		wdev->current_bss = NULL;
 	}
 
@@ -480,7 +480,7 @@ void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 		kfree(wdev->connect_keys);
 		wdev->connect_keys = NULL;
 		wdev->ssid_len = 0;
-		cfg80211_put_bss(bss);
+		cfg80211_put_bss(wdev->wiphy, bss);
 		return;
 	}
 
@@ -586,7 +586,7 @@ void __cfg80211_roamed(struct wireless_dev *wdev,
 	}
 
 	cfg80211_unhold_bss(wdev->current_bss);
-	cfg80211_put_bss(&wdev->current_bss->pub);
+	cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 	wdev->current_bss = NULL;
 
 	cfg80211_hold_bss(bss_from_pub(bss));
@@ -621,7 +621,7 @@ void __cfg80211_roamed(struct wireless_dev *wdev,
 
 	return;
 out:
-	cfg80211_put_bss(bss);
+	cfg80211_put_bss(wdev->wiphy, bss);
 }
 
 void cfg80211_roamed(struct net_device *dev,
@@ -663,7 +663,7 @@ void cfg80211_roamed_bss(struct net_device *dev,
 
 	ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 	if (!ev) {
-		cfg80211_put_bss(bss);
+		cfg80211_put_bss(wdev->wiphy, bss);
 		return;
 	}
 
@@ -704,7 +704,7 @@ void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 
 	if (wdev->current_bss) {
 		cfg80211_unhold_bss(wdev->current_bss);
-		cfg80211_put_bss(&wdev->current_bss->pub);
+		cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 	}
 
 	wdev->current_bss = NULL;
@@ -875,7 +875,7 @@ int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 		if (bss) {
 			wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 			err = cfg80211_conn_do_work(wdev);
-			cfg80211_put_bss(bss);
+			cfg80211_put_bss(wdev->wiphy, bss);
 		} else {
 			/* otherwise we'll need to scan for the AP first */
 			err = cfg80211_conn_scan(wdev);
-- 
cgit v1.2.3


From 04f39047af2a6df64b763ea5a271db24879d0391 Mon Sep 17 00:00:00 2001
From: Simon Wunderlich <simon.wunderlich@s2003.tu-chemnitz.de>
Date: Fri, 8 Feb 2013 18:16:19 +0100
Subject: nl80211/cfg80211: add radar detection command/event

Add new NL80211_CMD_RADAR_DETECT, which starts the Channel
Availability Check (CAC). This command will also notify the
usermode about events (CAC finished, CAC aborted, radar
detected, NOP finished).
Once radar detection has started it should continuously
monitor for radars as long as the channel is active.

This patch enables DFS for AP mode in nl80211/cfg80211.

Based on original patch by Victor Goldenshtein <victorg@ti.com>

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
[remove WIPHY_FLAG_HAS_RADAR_DETECT again -- my mistake]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 include/net/cfg80211.h       |  46 +++++++++++++++
 include/uapi/linux/nl80211.h |  61 +++++++++++++++++++
 net/wireless/chan.c          | 129 ++++++++++++++++++++++++++++++++++++++++-
 net/wireless/core.c          |   3 +
 net/wireless/core.h          |  28 +++++++++
 net/wireless/mlme.c          | 120 ++++++++++++++++++++++++++++++++++++++
 net/wireless/nl80211.c       | 135 +++++++++++++++++++++++++++++++++++++++++--
 net/wireless/nl80211.h       |   7 +++
 net/wireless/reg.c           |   3 +
 net/wireless/scan.c          |  10 ----
 net/wireless/trace.h         |  45 +++++++++++++++
 11 files changed, 570 insertions(+), 17 deletions(-)

(limited to 'net/wireless/mlme.c')

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 7e6569e1f16f..ee11a3db730b 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -114,6 +114,9 @@ enum ieee80211_channel_flags {
 #define IEEE80211_CHAN_NO_HT40 \
 	(IEEE80211_CHAN_NO_HT40PLUS | IEEE80211_CHAN_NO_HT40MINUS)
 
+#define IEEE80211_DFS_MIN_CAC_TIME_MS		60000
+#define IEEE80211_DFS_MIN_NOP_TIME_MS		(30 * 60 * 1000)
+
 /**
  * struct ieee80211_channel - channel definition
  *
@@ -134,6 +137,9 @@ enum ieee80211_channel_flags {
  *	to enable this, this is useful only on 5 GHz band.
  * @orig_mag: internal use
  * @orig_mpwr: internal use
+ * @dfs_state: current state of this channel. Only relevant if radar is required
+ *	on this channel.
+ * @dfs_state_entered: timestamp (jiffies) when the dfs state was entered.
  */
 struct ieee80211_channel {
 	enum ieee80211_band band;
@@ -146,6 +152,8 @@ struct ieee80211_channel {
 	bool beacon_found;
 	u32 orig_flags;
 	int orig_mag, orig_mpwr;
+	enum nl80211_dfs_state dfs_state;
+	unsigned long dfs_state_entered;
 };
 
 /**
@@ -569,6 +577,7 @@ struct cfg80211_acl_data {
  * @p2p_opp_ps: P2P opportunistic PS
  * @acl: ACL configuration used by the drivers which has support for
  *	MAC address based access control
+ * @radar_required: set if radar detection is required
  */
 struct cfg80211_ap_settings {
 	struct cfg80211_chan_def chandef;
@@ -586,6 +595,7 @@ struct cfg80211_ap_settings {
 	u8 p2p_ctwindow;
 	bool p2p_opp_ps;
 	const struct cfg80211_acl_data *acl;
+	bool radar_required;
 };
 
 /**
@@ -1909,6 +1919,8 @@ struct cfg80211_gtk_rekey_data {
  *	this new list replaces the existing one. Driver has to clear its ACL
  *	when number of MAC addresses entries is passed as 0. Drivers which
  *	advertise the support for MAC based ACL have to implement this callback.
+ *
+ * @start_radar_detection: Start radar detection in the driver.
  */
 struct cfg80211_ops {
 	int	(*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);
@@ -2132,6 +2144,10 @@ struct cfg80211_ops {
 
 	int	(*set_mac_acl)(struct wiphy *wiphy, struct net_device *dev,
 			       const struct cfg80211_acl_data *params);
+
+	int	(*start_radar_detection)(struct wiphy *wiphy,
+					 struct net_device *dev,
+					 struct cfg80211_chan_def *chandef);
 };
 
 /*
@@ -2715,6 +2731,8 @@ struct cfg80211_cached_keys;
  *	beacons, 0 when not valid
  * @address: The address for this device, valid only if @netdev is %NULL
  * @p2p_started: true if this is a P2P Device that has been started
+ * @cac_started: true if DFS channel availability check has been started
+ * @cac_start_time: timestamp (jiffies) when the dfs state was entered.
  */
 struct wireless_dev {
 	struct wiphy *wiphy;
@@ -2766,6 +2784,9 @@ struct wireless_dev {
 
 	u32 ap_unexpected_nlportid;
 
+	bool cac_started;
+	unsigned long cac_start_time;
+
 #ifdef CONFIG_CFG80211_WEXT
 	/* wext data */
 	struct {
@@ -3754,6 +3775,31 @@ void cfg80211_cqm_rssi_notify(struct net_device *dev,
 			      enum nl80211_cqm_rssi_threshold_event rssi_event,
 			      gfp_t gfp);
 
+/**
+ * cfg80211_radar_event - radar detection event
+ * @wiphy: the wiphy
+ * @chandef: chandef for the current channel
+ * @gfp: context flags
+ *
+ * This function is called when a radar is detected on the current chanenl.
+ */
+void cfg80211_radar_event(struct wiphy *wiphy,
+			  struct cfg80211_chan_def *chandef, gfp_t gfp);
+
+/**
+ * cfg80211_cac_event - Channel availability check (CAC) event
+ * @netdev: network device
+ * @event: type of event
+ * @gfp: context flags
+ *
+ * This function is called when a Channel availability check (CAC) is finished
+ * or aborted. This must be called to notify the completion of a CAC process,
+ * also by full-MAC drivers.
+ */
+void cfg80211_cac_event(struct net_device *netdev,
+			enum nl80211_radar_event event, gfp_t gfp);
+
+
 /**
  * cfg80211_cqm_pktloss_notify - notify userspace about packetloss to peer
  * @dev: network device
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 5309b34930ea..90b7af86f392 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -603,6 +603,14 @@
  *	command is used in AP/P2P GO mode. Driver has to make sure to clear its
  *	ACL list during %NL80211_CMD_STOP_AP.
  *
+ * @NL80211_CMD_RADAR_DETECT: Start a Channel availability check (CAC). Once
+ *	a radar is detected or the channel availability scan (CAC) has finished
+ *	or was aborted, or a radar was detected, usermode will be notified with
+ *	this event. This command is also used to notify userspace about radars
+ *	while operating on this channel.
+ *	%NL80211_ATTR_RADAR_EVENT is used to inform about the type of the
+ *	event.
+ *
  * @NL80211_CMD_MAX: highest used command number
  * @__NL80211_CMD_AFTER_LAST: internal use
  */
@@ -755,6 +763,8 @@ enum nl80211_commands {
 
 	NL80211_CMD_SET_MAC_ACL,
 
+	NL80211_CMD_RADAR_DETECT,
+
 	/* add new commands above here */
 
 	/* used to define NL80211_CMD_MAX below */
@@ -1342,6 +1352,9 @@ enum nl80211_commands {
  *	number of MAC addresses that a device can support for MAC
  *	ACL.
  *
+ * @NL80211_ATTR_RADAR_EVENT: Type of radar event for notification to userspace,
+ *	contains a value of enum nl80211_radar_event (u32).
+ *
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
  */
@@ -1620,6 +1633,8 @@ enum nl80211_attrs {
 
 	NL80211_ATTR_MAC_ACL_MAX,
 
+	NL80211_ATTR_RADAR_EVENT,
+
 	/* add attributes here, update the policy in nl80211.c */
 
 	__NL80211_ATTR_AFTER_LAST,
@@ -2022,6 +2037,10 @@ enum nl80211_band_attr {
  *	on this channel in current regulatory domain.
  * @NL80211_FREQUENCY_ATTR_MAX_TX_POWER: Maximum transmission power in mBm
  *	(100 * dBm).
+ * @NL80211_FREQUENCY_ATTR_DFS_STATE: current state for DFS
+ *	(enum nl80211_dfs_state)
+ * @NL80211_FREQUENCY_ATTR_DFS_TIME: time in miliseconds for how long
+ *	this channel is in this DFS state.
  * @NL80211_FREQUENCY_ATTR_MAX: highest frequency attribute number
  *	currently defined
  * @__NL80211_FREQUENCY_ATTR_AFTER_LAST: internal use
@@ -2034,6 +2053,8 @@ enum nl80211_frequency_attr {
 	NL80211_FREQUENCY_ATTR_NO_IBSS,
 	NL80211_FREQUENCY_ATTR_RADAR,
 	NL80211_FREQUENCY_ATTR_MAX_TX_POWER,
+	NL80211_FREQUENCY_ATTR_DFS_STATE,
+	NL80211_FREQUENCY_ATTR_DFS_TIME,
 
 	/* keep last */
 	__NL80211_FREQUENCY_ATTR_AFTER_LAST,
@@ -3489,4 +3510,44 @@ enum nl80211_acl_policy {
 	NL80211_ACL_POLICY_DENY_UNLESS_LISTED,
 };
 
+/**
+ * enum nl80211_radar_event - type of radar event for DFS operation
+ *
+ * Type of event to be used with NL80211_ATTR_RADAR_EVENT to inform userspace
+ * about detected radars or success of the channel available check (CAC)
+ *
+ * @NL80211_RADAR_DETECTED: A radar pattern has been detected. The channel is
+ *	now unusable.
+ * @NL80211_RADAR_CAC_FINISHED: Channel Availability Check has been finished,
+ *	the channel is now available.
+ * @NL80211_RADAR_CAC_ABORTED: Channel Availability Check has been aborted, no
+ *	change to the channel status.
+ * @NL80211_RADAR_NOP_FINISHED: The Non-Occupancy Period for this channel is
+ *	over, channel becomes usable.
+ */
+enum nl80211_radar_event {
+	NL80211_RADAR_DETECTED,
+	NL80211_RADAR_CAC_FINISHED,
+	NL80211_RADAR_CAC_ABORTED,
+	NL80211_RADAR_NOP_FINISHED,
+};
+
+/**
+ * enum nl80211_dfs_state - DFS states for channels
+ *
+ * Channel states used by the DFS code.
+ *
+ * @IEEE80211_DFS_USABLE: The channel can be used, but channel availability
+ *	check (CAC) must be performed before using it for AP or IBSS.
+ * @IEEE80211_DFS_UNAVAILABLE: A radar has been detected on this channel, it
+ *	is therefore marked as not available.
+ * @IEEE80211_DFS_AVAILABLE: The channel has been CAC checked and is available.
+ */
+
+enum nl80211_dfs_state {
+	NL80211_DFS_USABLE,
+	NL80211_DFS_UNAVAILABLE,
+	NL80211_DFS_AVAILABLE,
+};
+
 #endif /* __LINUX_NL80211_H */
diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index 396373f3ec26..810c23cfb894 100644
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -147,6 +147,32 @@ static void chandef_primary_freqs(const struct cfg80211_chan_def *c,
 	}
 }
 
+static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c)
+{
+	int width;
+
+	switch (c->width) {
+	case NL80211_CHAN_WIDTH_20:
+	case NL80211_CHAN_WIDTH_20_NOHT:
+		width = 20;
+		break;
+	case NL80211_CHAN_WIDTH_40:
+		width = 40;
+		break;
+	case NL80211_CHAN_WIDTH_80P80:
+	case NL80211_CHAN_WIDTH_80:
+		width = 80;
+		break;
+	case NL80211_CHAN_WIDTH_160:
+		width = 160;
+		break;
+	default:
+		WARN_ON_ONCE(1);
+		return -1;
+	}
+	return width;
+}
+
 const struct cfg80211_chan_def *
 cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
 			    const struct cfg80211_chan_def *c2)
@@ -192,6 +218,93 @@ cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
 }
 EXPORT_SYMBOL(cfg80211_chandef_compatible);
 
+static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq,
+					 u32 bandwidth,
+					 enum nl80211_dfs_state dfs_state)
+{
+	struct ieee80211_channel *c;
+	u32 freq;
+
+	for (freq = center_freq - bandwidth/2 + 10;
+	     freq <= center_freq + bandwidth/2 - 10;
+	     freq += 20) {
+		c = ieee80211_get_channel(wiphy, freq);
+		if (!c || !(c->flags & IEEE80211_CHAN_RADAR))
+			continue;
+
+		c->dfs_state = dfs_state;
+		c->dfs_state_entered = jiffies;
+	}
+}
+
+void cfg80211_set_dfs_state(struct wiphy *wiphy,
+			    const struct cfg80211_chan_def *chandef,
+			    enum nl80211_dfs_state dfs_state)
+{
+	int width;
+
+	if (WARN_ON(!cfg80211_chandef_valid(chandef)))
+		return;
+
+	width = cfg80211_chandef_get_width(chandef);
+	if (width < 0)
+		return;
+
+	cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1,
+				     width, dfs_state);
+
+	if (!chandef->center_freq2)
+		return;
+	cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2,
+				     width, dfs_state);
+}
+
+static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy,
+					    u32 center_freq,
+					    u32 bandwidth)
+{
+	struct ieee80211_channel *c;
+	u32 freq;
+
+	for (freq = center_freq - bandwidth/2 + 10;
+	     freq <= center_freq + bandwidth/2 - 10;
+	     freq += 20) {
+		c = ieee80211_get_channel(wiphy, freq);
+		if (!c)
+			return -EINVAL;
+
+		if (c->flags & IEEE80211_CHAN_RADAR)
+			return 1;
+	}
+	return 0;
+}
+
+
+int cfg80211_chandef_dfs_required(struct wiphy *wiphy,
+				  const struct cfg80211_chan_def *chandef)
+{
+	int width;
+	int r;
+
+	if (WARN_ON(!cfg80211_chandef_valid(chandef)))
+		return -EINVAL;
+
+	width = cfg80211_chandef_get_width(chandef);
+	if (width < 0)
+		return -EINVAL;
+
+	r = cfg80211_get_chans_dfs_required(wiphy, chandef->center_freq1,
+					    width);
+	if (r)
+		return r;
+
+	if (!chandef->center_freq2)
+		return 0;
+
+	return cfg80211_get_chans_dfs_required(wiphy, chandef->center_freq2,
+					       width);
+}
+
 static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
 					u32 center_freq, u32 bandwidth,
 					u32 prohibited_flags)
@@ -203,7 +316,16 @@ static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
 	     freq <= center_freq + bandwidth/2 - 10;
 	     freq += 20) {
 		c = ieee80211_get_channel(wiphy, freq);
-		if (!c || c->flags & prohibited_flags)
+		if (!c)
+			return false;
+
+		/* check for radar flags */
+		if ((prohibited_flags & c->flags & IEEE80211_CHAN_RADAR) &&
+		    (c->dfs_state != NL80211_DFS_AVAILABLE))
+			return false;
+
+		/* check for the other flags */
+		if (c->flags & prohibited_flags & ~IEEE80211_CHAN_RADAR)
 			return false;
 	}
 
@@ -344,7 +466,10 @@ cfg80211_get_chan_state(struct wireless_dev *wdev,
 		break;
 	case NL80211_IFTYPE_AP:
 	case NL80211_IFTYPE_P2P_GO:
-		if (wdev->beacon_interval) {
+		if (wdev->cac_started) {
+			*chan = wdev->channel;
+			*chanmode = CHAN_MODE_SHARED;
+		} else if (wdev->beacon_interval) {
 			*chan = wdev->channel;
 			*chanmode = CHAN_MODE_SHARED;
 		}
diff --git a/net/wireless/core.c b/net/wireless/core.c
index f0a1bbe95cff..922002105062 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -324,6 +324,8 @@ struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
 	INIT_LIST_HEAD(&rdev->bss_list);
 	INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
 	INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
+	INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
+			  cfg80211_dfs_channels_update_work);
 #ifdef CONFIG_CFG80211_WEXT
 	rdev->wiphy.wext = &cfg80211_wext_handler;
 #endif
@@ -695,6 +697,7 @@ void wiphy_unregister(struct wiphy *wiphy)
 	flush_work(&rdev->scan_done_wk);
 	cancel_work_sync(&rdev->conn_work);
 	flush_work(&rdev->event_work);
+	cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
 
 	if (rdev->wowlan && rdev->ops->set_wakeup)
 		rdev_set_wakeup(rdev, false);
diff --git a/net/wireless/core.h b/net/wireless/core.h
index 949c9573d8d7..3aec0e429d8a 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -86,6 +86,8 @@ struct cfg80211_registered_device {
 
 	struct cfg80211_wowlan *wowlan;
 
+	struct delayed_work dfs_update_channels_wk;
+
 	/* must be last because of the way we do wiphy_priv(),
 	 * and it should at least be aligned to NETDEV_ALIGN */
 	struct wiphy wiphy __aligned(NETDEV_ALIGN);
@@ -431,6 +433,22 @@ int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
 				 enum cfg80211_chan_mode chanmode,
 				 u8 radar_detect);
 
+/**
+ * cfg80211_chandef_dfs_required - checks if radar detection is required
+ * @wiphy: the wiphy to validate against
+ * @chandef: the channel definition to check
+ * Return: 1 if radar detection is required, 0 if it is not, < 0 on error
+ */
+int cfg80211_chandef_dfs_required(struct wiphy *wiphy,
+				  const struct cfg80211_chan_def *c);
+
+void cfg80211_set_dfs_state(struct wiphy *wiphy,
+			    const struct cfg80211_chan_def *chandef,
+			    enum nl80211_dfs_state dfs_state);
+
+void cfg80211_dfs_channels_update_work(struct work_struct *work);
+
+
 static inline int
 cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
 			      struct wireless_dev *wdev,
@@ -457,6 +475,16 @@ cfg80211_can_use_chan(struct cfg80211_registered_device *rdev,
 					    chan, chanmode, 0);
 }
 
+static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
+{
+	unsigned long end = jiffies;
+
+	if (end >= start)
+		return jiffies_to_msecs(end - start);
+
+	return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
+}
+
 void
 cfg80211_get_chan_state(struct wireless_dev *wdev,
 		        struct ieee80211_channel **chan,
diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index 8e6920728c43..caddca35d686 100644
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -987,3 +987,123 @@ void cfg80211_pmksa_candidate_notify(struct net_device *dev, int index,
 	nl80211_pmksa_candidate_notify(rdev, dev, index, bssid, preauth, gfp);
 }
 EXPORT_SYMBOL(cfg80211_pmksa_candidate_notify);
+
+void cfg80211_dfs_channels_update_work(struct work_struct *work)
+{
+	struct delayed_work *delayed_work;
+	struct cfg80211_registered_device *rdev;
+	struct cfg80211_chan_def chandef;
+	struct ieee80211_supported_band *sband;
+	struct ieee80211_channel *c;
+	struct wiphy *wiphy;
+	bool check_again = false;
+	unsigned long timeout, next_time = 0;
+	int bandid, i;
+
+	delayed_work = container_of(work, struct delayed_work, work);
+	rdev = container_of(delayed_work, struct cfg80211_registered_device,
+			    dfs_update_channels_wk);
+	wiphy = &rdev->wiphy;
+
+	mutex_lock(&cfg80211_mutex);
+	for (bandid = 0; bandid < IEEE80211_NUM_BANDS; bandid++) {
+		sband = wiphy->bands[bandid];
+		if (!sband)
+			continue;
+
+		for (i = 0; i < sband->n_channels; i++) {
+			c = &sband->channels[i];
+
+			if (c->dfs_state != NL80211_DFS_UNAVAILABLE)
+				continue;
+
+			timeout = c->dfs_state_entered +
+				  IEEE80211_DFS_MIN_NOP_TIME_MS;
+
+			if (time_after_eq(jiffies, timeout)) {
+				c->dfs_state = NL80211_DFS_USABLE;
+				cfg80211_chandef_create(&chandef, c,
+							NL80211_CHAN_NO_HT);
+
+				nl80211_radar_notify(rdev, &chandef,
+						     NL80211_RADAR_NOP_FINISHED,
+						     NULL, GFP_ATOMIC);
+				continue;
+			}
+
+			if (!check_again)
+				next_time = timeout - jiffies;
+			else
+				next_time = min(next_time, timeout - jiffies);
+			check_again = true;
+		}
+	}
+	mutex_unlock(&cfg80211_mutex);
+
+	/* reschedule if there are other channels waiting to be cleared again */
+	if (check_again)
+		queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
+				   next_time);
+}
+
+
+void cfg80211_radar_event(struct wiphy *wiphy,
+			  struct cfg80211_chan_def *chandef,
+			  gfp_t gfp)
+{
+	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
+	unsigned long timeout;
+
+	trace_cfg80211_radar_event(wiphy, chandef);
+
+	/* only set the chandef supplied channel to unavailable, in
+	 * case the radar is detected on only one of multiple channels
+	 * spanned by the chandef.
+	 */
+	cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_UNAVAILABLE);
+
+	timeout = msecs_to_jiffies(IEEE80211_DFS_MIN_NOP_TIME_MS);
+	queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
+			   timeout);
+
+	nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp);
+}
+EXPORT_SYMBOL(cfg80211_radar_event);
+
+void cfg80211_cac_event(struct net_device *netdev,
+			enum nl80211_radar_event event, gfp_t gfp)
+{
+	struct wireless_dev *wdev = netdev->ieee80211_ptr;
+	struct wiphy *wiphy = wdev->wiphy;
+	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
+	struct cfg80211_chan_def chandef;
+	unsigned long timeout;
+
+	trace_cfg80211_cac_event(netdev, event);
+
+	if (WARN_ON(!wdev->cac_started))
+		return;
+
+	if (WARN_ON(!wdev->channel))
+		return;
+
+	cfg80211_chandef_create(&chandef, wdev->channel, NL80211_CHAN_NO_HT);
+
+	switch (event) {
+	case NL80211_RADAR_CAC_FINISHED:
+		timeout = wdev->cac_start_time +
+			  msecs_to_jiffies(IEEE80211_DFS_MIN_CAC_TIME_MS);
+		WARN_ON(!time_after_eq(jiffies, timeout));
+		cfg80211_set_dfs_state(wiphy, &chandef, NL80211_DFS_AVAILABLE);
+		break;
+	case NL80211_RADAR_CAC_ABORTED:
+		break;
+	default:
+		WARN_ON(1);
+		return;
+	}
+	wdev->cac_started = false;
+
+	nl80211_radar_notify(rdev, &chandef, event, netdev, gfp);
+}
+EXPORT_SYMBOL(cfg80211_cac_event);
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index d29a461b4981..c1e18ccf4049 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -552,9 +552,16 @@ static int nl80211_msg_put_channel(struct sk_buff *msg,
 	if ((chan->flags & IEEE80211_CHAN_NO_IBSS) &&
 	    nla_put_flag(msg, NL80211_FREQUENCY_ATTR_NO_IBSS))
 		goto nla_put_failure;
-	if ((chan->flags & IEEE80211_CHAN_RADAR) &&
-	    nla_put_flag(msg, NL80211_FREQUENCY_ATTR_RADAR))
-		goto nla_put_failure;
+	if (chan->flags & IEEE80211_CHAN_RADAR) {
+		u32 time = elapsed_jiffies_msecs(chan->dfs_state_entered);
+		if (nla_put_flag(msg, NL80211_FREQUENCY_ATTR_RADAR))
+			goto nla_put_failure;
+		if (nla_put_u32(msg, NL80211_FREQUENCY_ATTR_DFS_STATE,
+				chan->dfs_state))
+			goto nla_put_failure;
+		if (nla_put_u32(msg, NL80211_FREQUENCY_ATTR_DFS_TIME, time))
+			goto nla_put_failure;
+	}
 
 	if (nla_put_u32(msg, NL80211_FREQUENCY_ATTR_MAX_TX_POWER,
 			DBM_TO_MBM(chan->max_power)))
@@ -2775,6 +2782,7 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_ap_settings params;
 	int err;
+	u8 radar_detect_width = 0;
 
 	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_AP &&
 	    dev->ieee80211_ptr->iftype != NL80211_IFTYPE_P2P_GO)
@@ -2893,9 +2901,19 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
 	if (!cfg80211_reg_can_beacon(&rdev->wiphy, &params.chandef))
 		return -EINVAL;
 
+	err = cfg80211_chandef_dfs_required(wdev->wiphy, &params.chandef);
+	if (err < 0)
+		return err;
+	if (err) {
+		radar_detect_width = BIT(params.chandef.width);
+		params.radar_required = true;
+	}
+
 	mutex_lock(&rdev->devlist_mtx);
-	err = cfg80211_can_use_chan(rdev, wdev, params.chandef.chan,
-				    CHAN_MODE_SHARED);
+	err = cfg80211_can_use_iftype_chan(rdev, wdev, wdev->iftype,
+					   params.chandef.chan,
+					   CHAN_MODE_SHARED,
+					   radar_detect_width);
 	mutex_unlock(&rdev->devlist_mtx);
 
 	if (err)
@@ -5055,6 +5073,54 @@ static int nl80211_stop_sched_scan(struct sk_buff *skb,
 	return err;
 }
 
+static int nl80211_start_radar_detection(struct sk_buff *skb,
+					 struct genl_info *info)
+{
+	struct cfg80211_registered_device *rdev = info->user_ptr[0];
+	struct net_device *dev = info->user_ptr[1];
+	struct wireless_dev *wdev = dev->ieee80211_ptr;
+	struct cfg80211_chan_def chandef;
+	int err;
+
+	err = nl80211_parse_chandef(rdev, info, &chandef);
+	if (err)
+		return err;
+
+	if (wdev->cac_started)
+		return -EBUSY;
+
+	err = cfg80211_chandef_dfs_required(wdev->wiphy, &chandef);
+	if (err < 0)
+		return err;
+
+	if (err == 0)
+		return -EINVAL;
+
+	if (chandef.chan->dfs_state != NL80211_DFS_USABLE)
+		return -EINVAL;
+
+	if (!rdev->ops->start_radar_detection)
+		return -EOPNOTSUPP;
+
+	mutex_lock(&rdev->devlist_mtx);
+	err = cfg80211_can_use_iftype_chan(rdev, wdev, wdev->iftype,
+					   chandef.chan, CHAN_MODE_SHARED,
+					   BIT(chandef.width));
+	if (err)
+		goto err_locked;
+
+	err = rdev->ops->start_radar_detection(&rdev->wiphy, dev, &chandef);
+	if (!err) {
+		wdev->channel = chandef.chan;
+		wdev->cac_started = true;
+		wdev->cac_start_time = jiffies;
+	}
+err_locked:
+	mutex_unlock(&rdev->devlist_mtx);
+
+	return err;
+}
+
 static int nl80211_send_bss(struct sk_buff *msg, struct netlink_callback *cb,
 			    u32 seq, int flags,
 			    struct cfg80211_registered_device *rdev,
@@ -8305,6 +8371,14 @@ static struct genl_ops nl80211_ops[] = {
 		.internal_flags = NL80211_FLAG_NEED_NETDEV |
 				  NL80211_FLAG_NEED_RTNL,
 	},
+	{
+		.cmd = NL80211_CMD_RADAR_DETECT,
+		.doit = nl80211_start_radar_detection,
+		.policy = nl80211_policy,
+		.flags = GENL_ADMIN_PERM,
+		.internal_flags = NL80211_FLAG_NEED_NETDEV_UP |
+				  NL80211_FLAG_NEED_RTNL,
+	},
 };
 
 static struct genl_multicast_group nl80211_mlme_mcgrp = {
@@ -9501,6 +9575,57 @@ nl80211_send_cqm_txe_notify(struct cfg80211_registered_device *rdev,
 	nlmsg_free(msg);
 }
 
+void
+nl80211_radar_notify(struct cfg80211_registered_device *rdev,
+		     struct cfg80211_chan_def *chandef,
+		     enum nl80211_radar_event event,
+		     struct net_device *netdev, gfp_t gfp)
+{
+	struct sk_buff *msg;
+	void *hdr;
+
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp);
+	if (!msg)
+		return;
+
+	hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_RADAR_DETECT);
+	if (!hdr) {
+		nlmsg_free(msg);
+		return;
+	}
+
+	if (nla_put_u32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx))
+		goto nla_put_failure;
+
+	/* NOP and radar events don't need a netdev parameter */
+	if (netdev) {
+		struct wireless_dev *wdev = netdev->ieee80211_ptr;
+
+		if (nla_put_u32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex) ||
+		    nla_put_u64(msg, NL80211_ATTR_WDEV, wdev_id(wdev)))
+			goto nla_put_failure;
+	}
+
+	if (nla_put_u32(msg, NL80211_ATTR_RADAR_EVENT, event))
+		goto nla_put_failure;
+
+	if (nl80211_send_chandef(msg, chandef))
+		goto nla_put_failure;
+
+	if (genlmsg_end(msg, hdr) < 0) {
+		nlmsg_free(msg);
+		return;
+	}
+
+	genlmsg_multicast_netns(wiphy_net(&rdev->wiphy), msg, 0,
+				nl80211_mlme_mcgrp.id, gfp);
+	return;
+
+ nla_put_failure:
+	genlmsg_cancel(msg, hdr);
+	nlmsg_free(msg);
+}
+
 void
 nl80211_send_cqm_pktloss_notify(struct cfg80211_registered_device *rdev,
 				struct net_device *netdev, const u8 *peer,
diff --git a/net/wireless/nl80211.h b/net/wireless/nl80211.h
index 2acba8477e9d..b061da4919e1 100644
--- a/net/wireless/nl80211.h
+++ b/net/wireless/nl80211.h
@@ -108,6 +108,13 @@ nl80211_send_cqm_rssi_notify(struct cfg80211_registered_device *rdev,
 			     struct net_device *netdev,
 			     enum nl80211_cqm_rssi_threshold_event rssi_event,
 			     gfp_t gfp);
+
+void
+nl80211_radar_notify(struct cfg80211_registered_device *rdev,
+		     struct cfg80211_chan_def *chandef,
+		     enum nl80211_radar_event event,
+		     struct net_device *netdev, gfp_t gfp);
+
 void
 nl80211_send_cqm_pktloss_notify(struct cfg80211_registered_device *rdev,
 				struct net_device *netdev, const u8 *peer,
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 08d3da2c70ab..e97d5b071ab6 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -884,6 +884,9 @@ static void handle_channel(struct wiphy *wiphy,
 		return;
 	}
 
+	chan->dfs_state = NL80211_DFS_USABLE;
+	chan->dfs_state_entered = jiffies;
+
 	chan->beacon_found = false;
 	chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
 	chan->max_antenna_gain =
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index d0fc6da2d097..f0d9b5154bab 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -1210,16 +1210,6 @@ static void ieee80211_scan_add_ies(struct iw_request_info *info,
 	}
 }
 
-static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
-{
-	unsigned long end = jiffies;
-
-	if (end >= start)
-		return jiffies_to_msecs(end - start);
-
-	return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
-}
-
 static char *
 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
 	      struct cfg80211_internal_bss *bss, char *current_ev,
diff --git a/net/wireless/trace.h b/net/wireless/trace.h
index c9cafb0ea95f..b7a531380e19 100644
--- a/net/wireless/trace.h
+++ b/net/wireless/trace.h
@@ -2051,6 +2051,21 @@ TRACE_EVENT(cfg80211_reg_can_beacon,
 		  WIPHY_PR_ARG, CHAN_DEF_PR_ARG)
 );
 
+TRACE_EVENT(cfg80211_chandef_dfs_required,
+	TP_PROTO(struct wiphy *wiphy, struct cfg80211_chan_def *chandef),
+	TP_ARGS(wiphy, chandef),
+	TP_STRUCT__entry(
+		WIPHY_ENTRY
+		CHAN_DEF_ENTRY
+	),
+	TP_fast_assign(
+		WIPHY_ASSIGN;
+		CHAN_DEF_ASSIGN(chandef);
+	),
+	TP_printk(WIPHY_PR_FMT ", " CHAN_DEF_PR_FMT,
+		  WIPHY_PR_ARG, CHAN_DEF_PR_ARG)
+);
+
 TRACE_EVENT(cfg80211_ch_switch_notify,
 	TP_PROTO(struct net_device *netdev,
 		 struct cfg80211_chan_def *chandef),
@@ -2067,6 +2082,36 @@ TRACE_EVENT(cfg80211_ch_switch_notify,
 		  NETDEV_PR_ARG, CHAN_DEF_PR_ARG)
 );
 
+TRACE_EVENT(cfg80211_radar_event,
+	TP_PROTO(struct wiphy *wiphy, struct cfg80211_chan_def *chandef),
+	TP_ARGS(wiphy, chandef),
+	TP_STRUCT__entry(
+		WIPHY_ENTRY
+		CHAN_DEF_ENTRY
+	),
+	TP_fast_assign(
+		WIPHY_ASSIGN;
+		CHAN_DEF_ASSIGN(chandef);
+	),
+	TP_printk(WIPHY_PR_FMT ", " CHAN_DEF_PR_FMT,
+		  WIPHY_PR_ARG, CHAN_DEF_PR_ARG)
+);
+
+TRACE_EVENT(cfg80211_cac_event,
+	TP_PROTO(struct net_device *netdev, enum nl80211_radar_event evt),
+	TP_ARGS(netdev, evt),
+	TP_STRUCT__entry(
+		NETDEV_ENTRY
+		__field(enum nl80211_radar_event, evt)
+	),
+	TP_fast_assign(
+		NETDEV_ASSIGN;
+		__entry->evt = evt;
+	),
+	TP_printk(NETDEV_PR_FMT ",  event: %d",
+		  NETDEV_PR_ARG, __entry->evt)
+);
+
 DECLARE_EVENT_CLASS(cfg80211_rx_evt,
 	TP_PROTO(struct net_device *netdev, const u8 *addr),
 	TP_ARGS(netdev, addr),
-- 
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