nl80211: refactor common code in scan flags checks

There's a very common pattern to check for a scan flag and
then reject it if an extended feature flag isn't set, factor
this out into a helper function.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 07514ca..6c3ded1 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -6861,6 +6861,16 @@ static bool cfg80211_off_channel_oper_allowed(struct wireless_dev *wdev)
        return regulatory_pre_cac_allowed(wdev->wiphy);
 }
 
+static bool nl80211_check_scan_feat(struct wiphy *wiphy, u32 flags, u32 flag,
+                                   enum nl80211_ext_feature_index feat)
+{
+       if (!(flags & flag))
+               return true;
+       if (wiphy_ext_feature_isset(wiphy, feat))
+               return true;
+       return false;
+}
+
 static int
 nl80211_check_scan_flags(struct wiphy *wiphy, struct wireless_dev *wdev,
                         void *request, struct nlattr **attrs,
@@ -6895,15 +6905,27 @@ nl80211_check_scan_flags(struct wiphy *wiphy, struct wireless_dev *wdev,
 
        if (((*flags & NL80211_SCAN_FLAG_LOW_PRIORITY) &&
             !(wiphy->features & NL80211_FEATURE_LOW_PRIORITY_SCAN)) ||
-           ((*flags & NL80211_SCAN_FLAG_LOW_SPAN) &&
-            !wiphy_ext_feature_isset(wiphy,
-                                     NL80211_EXT_FEATURE_LOW_SPAN_SCAN)) ||
-           ((*flags & NL80211_SCAN_FLAG_LOW_POWER) &&
-            !wiphy_ext_feature_isset(wiphy,
-                                     NL80211_EXT_FEATURE_LOW_POWER_SCAN)) ||
-           ((*flags & NL80211_SCAN_FLAG_HIGH_ACCURACY) &&
-            !wiphy_ext_feature_isset(wiphy,
-                                     NL80211_EXT_FEATURE_HIGH_ACCURACY_SCAN)))
+           !nl80211_check_scan_feat(wiphy, *flags,
+                                    NL80211_SCAN_FLAG_LOW_SPAN,
+                                    NL80211_EXT_FEATURE_LOW_SPAN_SCAN) ||
+           !nl80211_check_scan_feat(wiphy, *flags,
+                                    NL80211_SCAN_FLAG_LOW_POWER,
+                                    NL80211_EXT_FEATURE_LOW_POWER_SCAN) ||
+           !nl80211_check_scan_feat(wiphy, *flags,
+                                    NL80211_SCAN_FLAG_HIGH_ACCURACY,
+                                    NL80211_EXT_FEATURE_HIGH_ACCURACY_SCAN) ||
+           !nl80211_check_scan_feat(wiphy, *flags,
+                                    NL80211_SCAN_FLAG_FILS_MAX_CHANNEL_TIME,
+                                    NL80211_EXT_FEATURE_FILS_MAX_CHANNEL_TIME) ||
+           !nl80211_check_scan_feat(wiphy, *flags,
+                                    NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP,
+                                    NL80211_EXT_FEATURE_ACCEPT_BCAST_PROBE_RESP) ||
+           !nl80211_check_scan_feat(wiphy, *flags,
+                                    NL80211_SCAN_FLAG_OCE_PROBE_REQ_DEFERRAL_SUPPRESSION,
+                                    NL80211_EXT_FEATURE_OCE_PROBE_REQ_DEFERRAL_SUPPRESSION) ||
+           !nl80211_check_scan_feat(wiphy, *flags,
+                                    NL80211_SCAN_FLAG_OCE_PROBE_REQ_HIGH_TX_RATE,
+                                    NL80211_EXT_FEATURE_OCE_PROBE_REQ_HIGH_TX_RATE))
                return -EOPNOTSUPP;
 
        if (*flags & NL80211_SCAN_FLAG_RANDOM_ADDR) {
@@ -6918,26 +6940,6 @@ nl80211_check_scan_flags(struct wiphy *wiphy, struct wireless_dev *wdev,
                        return err;
        }
 
-       if ((*flags & NL80211_SCAN_FLAG_FILS_MAX_CHANNEL_TIME) &&
-           !wiphy_ext_feature_isset(wiphy,
-                                    NL80211_EXT_FEATURE_FILS_MAX_CHANNEL_TIME))
-               return -EOPNOTSUPP;
-
-       if ((*flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP) &&
-          !wiphy_ext_feature_isset(wiphy,
-                                   NL80211_EXT_FEATURE_ACCEPT_BCAST_PROBE_RESP))
-               return -EOPNOTSUPP;
-
-       if ((*flags & NL80211_SCAN_FLAG_OCE_PROBE_REQ_DEFERRAL_SUPPRESSION) &&
-           !wiphy_ext_feature_isset(wiphy,
-                                    NL80211_EXT_FEATURE_OCE_PROBE_REQ_DEFERRAL_SUPPRESSION))
-               return -EOPNOTSUPP;
-
-       if ((*flags & NL80211_SCAN_FLAG_OCE_PROBE_REQ_HIGH_TX_RATE) &&
-           !wiphy_ext_feature_isset(wiphy,
-                                    NL80211_EXT_FEATURE_OCE_PROBE_REQ_HIGH_TX_RATE))
-               return -EOPNOTSUPP;
-
        return 0;
 }