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mac80211: abort CSA if beacon does not include CSA IEs 

In case we receive a beacon without CSA IE while we are in
the middle of channel switch - abort the operation.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Sara Sharon 2019-02-06 13:17:10 +02:00 committed by Johannes Berg
parent ee145775c1
commit b9cc81d827
4 changed files with 62 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/net/mac80211.h
View File

@ -3643,6 +3643,9 @@ enum ieee80211_reconfig_type {
* @post_channel_switch: This is an optional callback that is called
* after a channel switch procedure is completed, allowing the
* driver to go back to a normal configuration.
* @abort_channel_switch: This is an optional callback that is called
* when channel switch procedure was completed, allowing the
* driver to go back to a normal configuration.
*
* @join_ibss: Join an IBSS (on an IBSS interface); this is called after all
* information in bss_conf is set up and the beacon can be retrieved. A
@ -3946,6 +3949,8 @@ struct ieee80211_ops {
int (*post_channel_switch)(struct ieee80211_hw *hw,
struct ieee80211_vif *vif);
void (*abort_channel_switch)(struct ieee80211_hw *hw,
struct ieee80211_vif *vif);
int (*join_ibss)(struct ieee80211_hw *hw, struct ieee80211_vif *vif);
void (*leave_ibss)(struct ieee80211_hw *hw, struct ieee80211_vif *vif);

14
net/mac80211/driver-ops.h
View File

@ -1052,6 +1052,20 @@ drv_post_channel_switch(struct ieee80211_sub_if_data *sdata)
return ret;
}
static inline void
drv_abort_channel_switch(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
if (!check_sdata_in_driver(sdata))
return;
trace_drv_abort_channel_switch(local, sdata);
if (local->ops->abort_channel_switch)
local->ops->abort_channel_switch(&local->hw, &sdata->vif);
}
static inline int drv_join_ibss(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata)
{

43
net/mac80211/mlme.c
View File

@ -1258,6 +1258,32 @@ static void ieee80211_chswitch_timer(struct timer_list *t)
ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
}
static void
ieee80211_sta_abort_chanswitch(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
if (!local->ops->abort_channel_switch)
return;
mutex_lock(&local->mtx);
mutex_lock(&local->chanctx_mtx);
ieee80211_vif_unreserve_chanctx(sdata);
mutex_unlock(&local->chanctx_mtx);
if (sdata->csa_block_tx)
ieee80211_wake_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_CSA);
sdata->csa_block_tx = false;
sdata->vif.csa_active = false;
mutex_unlock(&local->mtx);
drv_abort_channel_switch(sdata);
}
static void
ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
u64 timestamp, u32 device_timestamp,
@ -1282,19 +1308,24 @@ ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
if (local->scanning)
return;
/* disregard subsequent announcements if we are already processing */
if (sdata->vif.csa_active)
return;
current_band = cbss->channel->band;
res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
ifmgd->flags,
ifmgd->associated->bssid, &csa_ie);
if (res < 0)
if (res < 0) {
ieee80211_queue_work(&local->hw,
&ifmgd->csa_connection_drop_work);
if (res)
return;
}
if (res && beacon && sdata->vif.csa_active &&
!ifmgd->csa_waiting_bcn) {
ieee80211_sta_abort_chanswitch(sdata);
return;
} else if (sdata->vif.csa_active || res) {
/* disregard subsequent announcements if already processing */
return;
}
if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
IEEE80211_CHAN_DISABLED)) {

6
net/mac80211/trace.h
View File

@ -2452,6 +2452,12 @@ DEFINE_EVENT(local_sdata_evt, drv_post_channel_switch,
TP_ARGS(local, sdata)
);
DEFINE_EVENT(local_sdata_evt, drv_abort_channel_switch,
TP_PROTO(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata),
TP_ARGS(local, sdata)
);
TRACE_EVENT(drv_get_txpower,
TP_PROTO(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,