cfg80211: add bss_type and privacy arguments in cfg80211_get_bss()

802.11ad adds new a network type (PBSS) and changes the capability
field interpretation for the DMG (60G) band.
The same 2 bits that were interpreted as "ESS" and "IBSS" before are
re-used as a 2-bit field with 3 valid values (and 1 reserved). Valid
values are: "IBSS", "PBSS" (new) and "AP".

In order to get the BSS struct for the new PBSS networks, change the
cfg80211_get_bss() function to take a new enum ieee80211_bss_type
argument with the valid network types, as "capa_mask" and "capa_val"
no longer work correctly (the search must be band-aware now.)

The remaining bits in "capa_mask" and "capa_val" are used only for
privacy matching so replace those two with a privacy enum as well.

Signed-off-by: Dedy Lansky <dlansky@codeaurora.org>
[rewrite commit log, tiny fixes]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

5 files changed, 102 insertions, 32 deletions

diff --git a/net/wireless/ibss.c b/net/wireless/ibss.c
index e24fc585c883..1a65662a5d73 100644
--- a/net/wireless/ibss.c
+++ b/net/wireless/ibss.c
@@ -30,7 +30,7 @@ void __cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid,
 		return;
 
 	bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, NULL, 0,
-			       WLAN_CAPABILITY_IBSS, WLAN_CAPABILITY_IBSS);
+			       IEEE80211_BSS_TYPE_IBSS, IEEE80211_PRIVACY_ANY);
 
 	if (WARN_ON(!bss))
 		return;
diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index 2c52b59e43f3..7aae329e2b4e 100644
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -229,7 +229,8 @@ int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 		return -EALREADY;
 
 	req.bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
-				   WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
+				   IEEE80211_BSS_TYPE_ESS,
+				   IEEE80211_PRIVACY_ANY);
 	if (!req.bss)
 		return -ENOENT;
 
@@ -296,7 +297,8 @@ int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
 				   rdev->wiphy.vht_capa_mod_mask);
 
 	req->bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
-				    WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
+				    IEEE80211_BSS_TYPE_ESS,
+				    IEEE80211_PRIVACY_ANY);
 	if (!req->bss)
 		return -ENOENT;
 
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index ceb8f0040dae..3a50aa2553bf 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -531,24 +531,78 @@ static int cmp_bss(struct cfg80211_bss *a,
 	}
 }
 
+static bool cfg80211_bss_type_match(u16 capability,
+				    enum ieee80211_band band,
+				    enum ieee80211_bss_type bss_type)
+{
+	bool ret = true;
+	u16 mask, val;
+
+	if (bss_type == IEEE80211_BSS_TYPE_ANY)
+		return ret;
+
+	if (band == IEEE80211_BAND_60GHZ) {
+		mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
+		switch (bss_type) {
+		case IEEE80211_BSS_TYPE_ESS:
+			val = WLAN_CAPABILITY_DMG_TYPE_AP;
+			break;
+		case IEEE80211_BSS_TYPE_PBSS:
+			val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
+			break;
+		case IEEE80211_BSS_TYPE_IBSS:
+			val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
+			break;
+		default:
+			return false;
+		}
+	} else {
+		mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
+		switch (bss_type) {
+		case IEEE80211_BSS_TYPE_ESS:
+			val = WLAN_CAPABILITY_ESS;
+			break;
+		case IEEE80211_BSS_TYPE_IBSS:
+			val = WLAN_CAPABILITY_IBSS;
+			break;
+		case IEEE80211_BSS_TYPE_MBSS:
+			val = 0;
+			break;
+		default:
+			return false;
+		}
+	}
+
+	ret = ((capability & mask) == val);
+	return ret;
+}
+
 /* Returned bss is reference counted and must be cleaned up appropriately. */
 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
 				      struct ieee80211_channel *channel,
 				      const u8 *bssid,
 				      const u8 *ssid, size_t ssid_len,
-				      u16 capa_mask, u16 capa_val)
+				      enum ieee80211_bss_type bss_type,
+				      enum ieee80211_privacy privacy)
 {
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 	struct cfg80211_internal_bss *bss, *res = NULL;
 	unsigned long now = jiffies;
+	int bss_privacy;
 
-	trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, capa_mask,
-			       capa_val);
+	trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
+			       privacy);
 
 	spin_lock_bh(&rdev->bss_lock);
 
 	list_for_each_entry(bss, &rdev->bss_list, list) {
-		if ((bss->pub.capability & capa_mask) != capa_val)
+		if (!cfg80211_bss_type_match(bss->pub.capability,
+					     bss->pub.channel->band, bss_type))
+			continue;
+
+		bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
+		if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
+		    (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
 			continue;
 		if (channel && bss->pub.channel != channel)
 			continue;
@@ -896,6 +950,7 @@ cfg80211_inform_bss_width(struct wiphy *wiphy,
 	struct cfg80211_bss_ies *ies;
 	struct ieee80211_channel *channel;
 	struct cfg80211_internal_bss tmp = {}, *res;
+	int bss_type;
 	bool signal_valid;
 
 	if (WARN_ON(!wiphy))
@@ -950,8 +1005,15 @@ cfg80211_inform_bss_width(struct wiphy *wiphy,
 	if (!res)
 		return NULL;
 
-	if (res->pub.capability & WLAN_CAPABILITY_ESS)
-		regulatory_hint_found_beacon(wiphy, channel, gfp);
+	if (channel->band == IEEE80211_BAND_60GHZ) {
+		bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
+		if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
+		    bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
+			regulatory_hint_found_beacon(wiphy, channel, gfp);
+	} else {
+		if (res->pub.capability & WLAN_CAPABILITY_ESS)
+			regulatory_hint_found_beacon(wiphy, channel, gfp);
+	}
 
 	trace_cfg80211_return_bss(&res->pub);
 	/* cfg80211_bss_update gives us a referenced result */
@@ -973,6 +1035,7 @@ cfg80211_inform_bss_width_frame(struct wiphy *wiphy,
 	bool signal_valid;
 	size_t ielen = len - offsetof(struct ieee80211_mgmt,
 				      u.probe_resp.variable);
+	int bss_type;
 
 	BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
 			offsetof(struct ieee80211_mgmt, u.beacon.variable));
@@ -1025,8 +1088,15 @@ cfg80211_inform_bss_width_frame(struct wiphy *wiphy,
 	if (!res)
 		return NULL;
 
-	if (res->pub.capability & WLAN_CAPABILITY_ESS)
-		regulatory_hint_found_beacon(wiphy, channel, gfp);
+	if (channel->band == IEEE80211_BAND_60GHZ) {
+		bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
+		if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
+		    bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
+			regulatory_hint_found_beacon(wiphy, channel, gfp);
+	} else {
+		if (res->pub.capability & WLAN_CAPABILITY_ESS)
+			regulatory_hint_found_beacon(wiphy, channel, gfp);
+	}
 
 	trace_cfg80211_return_bss(&res->pub);
 	/* cfg80211_bss_update gives us a referenced result */
diff --git a/net/wireless/sme.c b/net/wireless/sme.c
index 0ab3711c79a0..ea1da6621ff0 100644
--- a/net/wireless/sme.c
+++ b/net/wireless/sme.c
@@ -257,19 +257,15 @@ static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
 {
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	struct cfg80211_bss *bss;
-	u16 capa = WLAN_CAPABILITY_ESS;
 
 	ASSERT_WDEV_LOCK(wdev);
 
-	if (wdev->conn->params.privacy)
-		capa |= WLAN_CAPABILITY_PRIVACY;
-
 	bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel,
 			       wdev->conn->params.bssid,
 			       wdev->conn->params.ssid,
 			       wdev->conn->params.ssid_len,
-			       WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
-			       capa);
+			       IEEE80211_BSS_TYPE_ESS,
+			       IEEE80211_PRIVACY(wdev->conn->params.privacy));
 	if (!bss)
 		return NULL;
 
@@ -637,8 +633,8 @@ void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 		WARN_ON_ONCE(!wiphy_to_rdev(wdev->wiphy)->ops->connect);
 		bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 				       wdev->ssid, wdev->ssid_len,
-				       WLAN_CAPABILITY_ESS,
-				       WLAN_CAPABILITY_ESS);
+				       IEEE80211_BSS_TYPE_ESS,
+				       IEEE80211_PRIVACY_ANY);
 		if (bss)
 			cfg80211_hold_bss(bss_from_pub(bss));
 	}
@@ -795,8 +791,8 @@ void cfg80211_roamed(struct net_device *dev,
 	struct cfg80211_bss *bss;
 
 	bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, wdev->ssid,
-			       wdev->ssid_len, WLAN_CAPABILITY_ESS,
-			       WLAN_CAPABILITY_ESS);
+			       wdev->ssid_len,
+			       IEEE80211_BSS_TYPE_ESS, IEEE80211_PRIVACY_ANY);
 	if (WARN_ON(!bss))
 		return;
 
diff --git a/net/wireless/trace.h b/net/wireless/trace.h
index b17b3692f8c2..b19773c9c81b 100644
--- a/net/wireless/trace.h
+++ b/net/wireless/trace.h
@@ -2636,28 +2636,30 @@ DEFINE_EVENT(wiphy_only_evt, cfg80211_sched_scan_stopped,
 TRACE_EVENT(cfg80211_get_bss,
 	TP_PROTO(struct wiphy *wiphy, struct ieee80211_channel *channel,
 		 const u8 *bssid, const u8 *ssid, size_t ssid_len,
-		 u16 capa_mask, u16 capa_val),
-	TP_ARGS(wiphy, channel, bssid, ssid, ssid_len, capa_mask, capa_val),
+		 enum ieee80211_bss_type bss_type,
+		 enum ieee80211_privacy privacy),
+	TP_ARGS(wiphy, channel, bssid, ssid, ssid_len, bss_type, privacy),
 	TP_STRUCT__entry(
 		WIPHY_ENTRY
 		CHAN_ENTRY
 		MAC_ENTRY(bssid)
 		__dynamic_array(u8, ssid, ssid_len)
-		__field(u16, capa_mask)
-		__field(u16, capa_val)
+		__field(enum ieee80211_bss_type, bss_type)
+		__field(enum ieee80211_privacy, privacy)
 	),
 	TP_fast_assign(
 		WIPHY_ASSIGN;
 		CHAN_ASSIGN(channel);
 		MAC_ASSIGN(bssid, bssid);
 		memcpy(__get_dynamic_array(ssid), ssid, ssid_len);
-		__entry->capa_mask = capa_mask;
-		__entry->capa_val = capa_val;
-	),
-	TP_printk(WIPHY_PR_FMT ", " CHAN_PR_FMT ", " MAC_PR_FMT ", buf: %#.2x, "
-		  "capa_mask: %d, capa_val: %u", WIPHY_PR_ARG, CHAN_PR_ARG,
-		  MAC_PR_ARG(bssid), ((u8 *)__get_dynamic_array(ssid))[0],
-		  __entry->capa_mask, __entry->capa_val)
+		__entry->bss_type = bss_type;
+		__entry->privacy = privacy;
+	),
+	TP_printk(WIPHY_PR_FMT ", " CHAN_PR_FMT ", " MAC_PR_FMT
+		  ", buf: %#.2x, bss_type: %d, privacy: %d",
+		  WIPHY_PR_ARG, CHAN_PR_ARG, MAC_PR_ARG(bssid),
+		  ((u8 *)__get_dynamic_array(ssid))[0], __entry->bss_type,
+		  __entry->privacy)
 );
 
 TRACE_EVENT(cfg80211_inform_bss_width_frame,