wifi: mac80211: don't send keys to driver when fips_enabled

When fips_enabled is set, don't send any keys to the driver
(including possibly WoWLAN KEK/KCK material), assuming that
no device exists with the necessary certifications. If this
turns out to be false in the future, we can add a HW flag.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20250709233537.e5eebc2b19d8.I968ef8c9ffb48d464ada78685bd25d22349fb063@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/driver-ops.c

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright 2015 Intel Deutschland GmbH
- * Copyright (C) 2022-2024 Intel Corporation
+ * Copyright (C) 2022-2025 Intel Corporation
  */
 #include <net/mac80211.h>
 #include "ieee80211_i.h"
@@ -515,6 +515,9 @@ int drv_set_key(struct ieee80211_local *local,
 		    !(sdata->vif.active_links & BIT(key->link_id))))
 		return -ENOLINK;
 
+	if (fips_enabled)
+		return -EOPNOTSUPP;
+
 	trace_drv_set_key(local, cmd, sdata, sta, key);
 	ret = local->ops->set_key(&local->hw, cmd, &sdata->vif, sta, key);
 	trace_drv_return_int(local, ret);

net/mac80211/driver-ops.h

@@ -8,6 +8,7 @@
 #ifndef __MAC80211_DRIVER_OPS
 #define __MAC80211_DRIVER_OPS
 
+#include <linux/fips.h>
 #include <net/mac80211.h>
 #include "ieee80211_i.h"
 #include "trace.h"
@@ -902,6 +903,9 @@ static inline void drv_set_rekey_data(struct ieee80211_local *local,
 	if (!check_sdata_in_driver(sdata))
 		return;
 
+	if (fips_enabled)
+		return;
+
 	trace_drv_set_rekey_data(local, sdata, data);
 	if (local->ops->set_rekey_data)
 		local->ops->set_rekey_data(&local->hw, &sdata->vif, data);