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authorIlan Peer <ilan.peer@intel.com>2018-02-19 14:48:41 +0200
committerJohannes Berg <johannes.berg@intel.com>2018-02-22 21:13:04 +0100
commit94ba92713f8329c96e0a8e2880b3c1a785d1c95c (patch)
tree7bc3888f2696e3e7a2445f5c8a14da48074b5836 /net/mac80211
parenta1f2ba04cc92414b6b933289365eab878b0b2bf4 (diff)
mac80211: Call mgd_prep_tx before transmitting deauthentication
In multi channel scenarios, when disassociating from the AP before a beacon was heard from the AP, it is not guaranteed that the virtual interface is granted air time for the transmission of the deauthentication frame. This in turn can lead to various issues as the AP might never get the deauthentication frame. To mitigate such possible issues, add a HW flag indicating that the driver requires mac80211 to call the mgd_prep_tx() driver callback to make sure that the virtual interface is granted immediate airtime to be able to transmit the frame, in case that no beacon was heard from the AP. Signed-off-by: Ilan Peer <ilan.peer@intel.com> Signed-off-by: Luca Coelho <luciano.coelho@intel.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211')
-rw-r--r--net/mac80211/debugfs.c1
-rw-r--r--net/mac80211/mlme.c16
2 files changed, 16 insertions, 1 deletions
diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
index 1f466d12a6bc..a75653affbf7 100644
--- a/net/mac80211/debugfs.c
+++ b/net/mac80211/debugfs.c
@@ -212,6 +212,7 @@ static const char *hw_flag_names[] = {
FLAG(REPORTS_LOW_ACK),
FLAG(SUPPORTS_TX_FRAG),
FLAG(SUPPORTS_TDLS_BUFFER_STA),
+ FLAG(DEAUTH_NEED_MGD_TX_PREP),
#undef FLAG
};
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 010b127a3937..0024eff9bb84 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -7,6 +7,7 @@
* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
* Copyright 2013-2014 Intel Mobile Communications GmbH
* Copyright (C) 2015 - 2017 Intel Deutschland GmbH
+ * Copyright (C) 2018 Intel Corporation
*
* 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
@@ -2008,9 +2009,22 @@ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
ieee80211_flush_queues(local, sdata, true);
/* deauthenticate/disassociate now */
- if (tx || frame_buf)
+ if (tx || frame_buf) {
+ struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
+
+ /*
+ * In multi channel scenarios guarantee that the virtual
+ * interface is granted immediate airtime to transmit the
+ * deauthentication frame by calling mgd_prepare_tx, if the
+ * driver requested so.
+ */
+ if (ieee80211_hw_check(&local->hw, DEAUTH_NEED_MGD_TX_PREP) &&
+ !ifmgd->have_beacon)
+ drv_mgd_prepare_tx(sdata->local, sdata);
+
ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
reason, tx, frame_buf);
+ }
/* flush out frame - make sure the deauth was actually sent */
if (tx)