mac80211: oce: enable receiving of bcast probe resp

One of OCE's optimizations is acception of broadcast probe responses.
Accept broadcast probe responses but don't set
NL80211_EXT_FEATURE_ACCEPT_BCAST_PROBE_RESP. Because a device's firmware
may filter out the broadcast probe resp - drivers should set this flag.

Signed-off-by: Roee Zamir <roee.zamir@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
[johannes: make accepting broadcast conditional on the nl80211 scan
 flag that was added for that specific purpose]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 28 insertions, 9 deletions

diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 47d2ed570470..ef2becaade50 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -7,7 +7,7 @@
  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
  * Copyright 2013-2015  Intel Mobile Communications GmbH
- * Copyright 2016  Intel Deutschland GmbH
+ * Copyright 2016-2017  Intel Deutschland GmbH
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -183,6 +183,20 @@ ieee80211_bss_info_update(struct ieee80211_local *local,
         return bss;
 }
 
+static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata,
+                                        u32 scan_flags, const u8 *da)
+{
+        if (!sdata)
+                return false;
+        /* accept broadcast for OCE */
+        if (scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP &&
+            is_broadcast_ether_addr(da))
+                return true;
+        if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
+                return true;
+        return ether_addr_equal(da, sdata->vif.addr);
+}
+
 void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
 {
         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
@@ -208,19 +222,24 @@ void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
         if (ieee80211_is_probe_resp(mgmt->frame_control)) {
                 struct cfg80211_scan_request *scan_req;
                 struct cfg80211_sched_scan_request *sched_scan_req;
+                u32 scan_req_flags = 0, sched_scan_req_flags = 0;
 
                 scan_req = rcu_dereference(local->scan_req);
                 sched_scan_req = rcu_dereference(local->sched_scan_req);
 
-                /* ignore ProbeResp to foreign address unless scanning
-                 * with randomised address
+                if (scan_req)
+                        scan_req_flags = scan_req->flags;
+
+                if (sched_scan_req)
+                        sched_scan_req_flags = sched_scan_req->flags;
+
+                /* ignore ProbeResp to foreign address or non-bcast (OCE)
+                 * unless scanning with randomised address
                  */
-                if (!(sdata1 &&
-                      (ether_addr_equal(mgmt->da, sdata1->vif.addr) ||
-                       scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)) &&
-                    !(sdata2 &&
-                      (ether_addr_equal(mgmt->da, sdata2->vif.addr) ||
-                       sched_scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)))
+                if (!ieee80211_scan_accept_presp(sdata1, scan_req_flags,
+                                                 mgmt->da) &&
+                    !ieee80211_scan_accept_presp(sdata2, sched_scan_req_flags,
+                                                 mgmt->da))
                         return;
 
                 elements = mgmt->u.probe_resp.variable;