Commit 6130fac9 authored by Johannes Berg's avatar Johannes Berg Committed by Greg Kroah-Hartman

mac80211: recalculate min channel width on VHT opmode changes


[ Upstream commit d2941df8 ]

When an associated station changes its VHT operating mode this
can/will affect the bandwidth it's using, and consequently we
must recalculate the minimum bandwidth we need to use. Failure
to do so can lead to one of two scenarios:
 1) we use a too high bandwidth, this is benign
 2) we use a too narrow bandwidth, causing rate control and
    actual PHY configuration to be out of sync, which can in
    turn cause problems/crashes
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d48cb21f
......@@ -6,6 +6,7 @@
* Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
* Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
* Copyright 2013-2014 Intel Mobile Communications GmbH
* Copyright (c) 2016 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
......@@ -1307,6 +1308,26 @@ static void ieee80211_iface_work(struct work_struct *work)
} else if (ieee80211_is_action(mgmt->frame_control) &&
mgmt->u.action.category == WLAN_CATEGORY_VHT) {
switch (mgmt->u.action.u.vht_group_notif.action_code) {
case WLAN_VHT_ACTION_OPMODE_NOTIF: {
struct ieee80211_rx_status *status;
enum nl80211_band band;
u8 opmode;
status = IEEE80211_SKB_RXCB(skb);
band = status->band;
opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
mutex_lock(&local->sta_mtx);
sta = sta_info_get_bss(sdata, mgmt->sa);
if (sta)
ieee80211_vht_handle_opmode(sdata, sta,
opmode,
band);
mutex_unlock(&local->sta_mtx);
break;
}
case WLAN_VHT_ACTION_GROUPID_MGMT:
ieee80211_process_mu_groups(sdata, mgmt);
break;
......
......@@ -2923,17 +2923,10 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
case WLAN_VHT_ACTION_OPMODE_NOTIF: {
u8 opmode;
/* verify opmode is present */
if (len < IEEE80211_MIN_ACTION_SIZE + 2)
goto invalid;
opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
opmode, status->band);
goto handled;
goto queue;
}
case WLAN_VHT_ACTION_GROUPID_MGMT: {
if (len < IEEE80211_MIN_ACTION_SIZE + 25)
......
......@@ -527,8 +527,10 @@ void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
u32 changed = __ieee80211_vht_handle_opmode(sdata, sta, opmode, band);
if (changed > 0)
if (changed > 0) {
ieee80211_recalc_min_chandef(sdata);
rate_control_rate_update(local, sband, sta, changed);
}
}
void ieee80211_get_vht_mask_from_cap(__le16 vht_cap,
......
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