mac80211: add last beacon time in scan list

This patch adds the interval between the scan results and the last time a
beacon was received in the result of the scan.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index c9f7c13d2e7e..cffef44cec05 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -4340,6 +4340,13 @@ ieee80211_sta_scan_result(struct net_device *dev,
                         current_ev = iwe_stream_add_point(info, current_ev,
                                                           end_buf,
                                                           &iwe, buf);
+                        memset(&iwe, 0, sizeof(iwe));
+                        iwe.cmd = IWEVCUSTOM;
+                        sprintf(buf, " Last beacon: %dms ago",
+                                jiffies_to_msecs(jiffies - bss->last_update));
+                        iwe.u.data.length = strlen(buf);
+                        current_ev = iwe_stream_add_point(info, current_ev,
+                                                          end_buf, &iwe, buf);
                         kfree(buf);
                 }
         }