cfg80211: add scan flag to indicate its priority

Add NL80211_SCAN_FLAG_LOW_PRIORITY flag support. It tells drivers
that this is a low priority scan request, so that they can take
necessary action.
Drivers need to advertise low priority scan capability during
registration.

Signed-off-by: Sam Leffler <sleffler@chromium.org>
Tested-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 14 insertions, 2 deletions

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index dc08211c6c6b..aee252d65b8f 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -4368,9 +4368,15 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
                 }
         }
 
-        if (info->attrs[NL80211_ATTR_SCAN_FLAGS])
+        if (info->attrs[NL80211_ATTR_SCAN_FLAGS]) {
                 request->flags = nla_get_u32(
                         info->attrs[NL80211_ATTR_SCAN_FLAGS]);
+                if ((request->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) &&
+                    !(wiphy->features & NL80211_FEATURE_LOW_PRIORITY_SCAN)) {
+                        err = -EOPNOTSUPP;
+                        goto out_free;
+                }
+        }
 
         request->no_cck =
                 nla_get_flag(info->attrs[NL80211_ATTR_TX_NO_CCK_RATE]);
@@ -4603,9 +4609,15 @@ static int nl80211_start_sched_scan(struct sk_buff *skb,
                        request->ie_len);
         }
 
-        if (info->attrs[NL80211_ATTR_SCAN_FLAGS])
+        if (info->attrs[NL80211_ATTR_SCAN_FLAGS]) {
                 request->flags = nla_get_u32(
                         info->attrs[NL80211_ATTR_SCAN_FLAGS]);
+                if ((request->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) &&
+                    !(wiphy->features & NL80211_FEATURE_LOW_PRIORITY_SCAN)) {
+                        err = -EOPNOTSUPP;
+                        goto out_free;
+                }
+        }
 
         request->dev = dev;
         request->wiphy = &rdev->wiphy;