cfg80211: change internal management frame registration API

Almost all drivers below cfg80211 get the API wrong (except for
cfg80211) and are unable to cope with multiple registrations for
the same frame type, which is valid due to the match filter.
This seems to indicate the API is wrong, and we should maintain
the full information in cfg80211 instead of the drivers.

Change the API to no longer inform the driver about individual
registrations and unregistrations, but rather every time about
the entire state of the entire wiphy and single wdev, whenever
it may have changed. This also simplifies the code in cfg80211
as it no longer has to track exactly what was unregistered and
can free things immediately.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Reviewed-by: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
Link: https://lore.kernel.org/r/20200417124300.f47f3828afc8.I7f81ef59c2c5a340d7075fb3c6d0e08e8aeffe07@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

2 files changed, 22 insertions, 30 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index b90f2131ec7a..e62b4764e82e 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -3398,44 +3398,35 @@ int ieee80211_attach_ack_skb(struct ieee80211_local *local, struct sk_buff *skb,
 	return 0;
 }
 
-static void ieee80211_mgmt_frame_register(struct wiphy *wiphy,
+static void
+ieee80211_update_mgmt_frame_registrations(struct wiphy *wiphy,
 					  struct wireless_dev *wdev,
-					  u16 frame_type, bool reg)
+					  struct mgmt_frame_regs *upd)
 {
 	struct ieee80211_local *local = wiphy_priv(wiphy);
 	struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
+	u32 preq_mask = BIT(IEEE80211_STYPE_PROBE_REQ >> 4);
+	bool global_change, intf_change;
 
-	switch (frame_type) {
-	case IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_PROBE_REQ:
-		if (reg) {
-			local->probe_req_reg++;
-			sdata->vif.probe_req_reg++;
-		} else {
-			if (local->probe_req_reg)
-				local->probe_req_reg--;
+	global_change =
+		local->probe_req_reg != !!(upd->global_stypes & preq_mask);
+	local->probe_req_reg = upd->global_stypes & preq_mask;
 
-			if (sdata->vif.probe_req_reg)
-				sdata->vif.probe_req_reg--;
-		}
+	intf_change = sdata->vif.probe_req_reg !=
+				!!(upd->interface_stypes & preq_mask);
+	sdata->vif.probe_req_reg = upd->interface_stypes & preq_mask;
 
-		if (!local->open_count)
-			break;
+	if (!local->open_count)
+		return;
 
-		if (ieee80211_sdata_running(sdata)) {
-			if (sdata->vif.probe_req_reg == 1)
-				drv_config_iface_filter(local, sdata,
-							FIF_PROBE_REQ,
-							FIF_PROBE_REQ);
-			else if (sdata->vif.probe_req_reg == 0)
-				drv_config_iface_filter(local, sdata, 0,
-							FIF_PROBE_REQ);
-		}
+	if (intf_change && ieee80211_sdata_running(sdata))
+		drv_config_iface_filter(local, sdata,
+					sdata->vif.probe_req_reg ?
+						FIF_PROBE_REQ : 0,
+					FIF_PROBE_REQ);
 
+	if (global_change)
 		ieee80211_configure_filter(local);
-		break;
-	default:
-		break;
-	}
 }
 
 static int ieee80211_set_antenna(struct wiphy *wiphy, u32 tx_ant, u32 rx_ant)
@@ -4020,7 +4011,8 @@ const struct cfg80211_ops mac80211_config_ops = {
 	.mgmt_tx_cancel_wait = ieee80211_mgmt_tx_cancel_wait,
 	.set_cqm_rssi_config = ieee80211_set_cqm_rssi_config,
 	.set_cqm_rssi_range_config = ieee80211_set_cqm_rssi_range_config,
-	.mgmt_frame_register = ieee80211_mgmt_frame_register,
+	.update_mgmt_frame_registrations =
+		ieee80211_update_mgmt_frame_registrations,
 	.set_antenna = ieee80211_set_antenna,
 	.get_antenna = ieee80211_get_antenna,
 	.set_rekey_data = ieee80211_set_rekey_data,
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 934a91bef575..da41ee996d3d 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1167,7 +1167,7 @@ struct ieee80211_local {
 	/* number of interfaces with corresponding FIF_ flags */
 	int fif_fcsfail, fif_plcpfail, fif_control, fif_other_bss, fif_pspoll,
 	    fif_probe_req;
-	int probe_req_reg;
+	bool probe_req_reg;
 	unsigned int filter_flags; /* FIF_* */
 
 	bool wiphy_ciphers_allocated;