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mac80211: agg-rx: refuse ADDBA Request with timeout update

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The current implementation of handling ADDBA Request while a session
is already active with the peer is wrong - in case the peer is using
the existing session's dialog token this should be treated as update
to the session, which can update the timeout value.

We don't really have a good way of supporting that, so reject, but
implement the required behaviour in the spec of "Even if the updated
ADDBA Request frame is not accepted, the original Block ACK setup
remains active." (802.11-2012 10.5.4)

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2016-07-06 14:44:14 +02:00
parent 59a7c828d7
commit f89e07d4cf
1 changed files with 18 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

18
net/mac80211/agg-rx.c
View file

@ -306,6 +306,24 @@ void __ieee80211_start_rx_ba_session(struct sta_info *sta,
mutex_lock(&sta->ampdu_mlme.mtx);
if (test_bit(tid, sta->ampdu_mlme.agg_session_valid)) {
tid_agg_rx = rcu_dereference_protected(
sta->ampdu_mlme.tid_rx[tid],
lockdep_is_held(&sta->ampdu_mlme.mtx));
if (tid_agg_rx->dialog_token == dialog_token) {
ht_dbg_ratelimited(sta->sdata,
"updated AddBA Req from %pM on tid %u\n",
sta->sta.addr, tid);
/* We have no API to update the timeout value in the
* driver so reject the timeout update.
*/
status = WLAN_STATUS_REQUEST_DECLINED;
ieee80211_send_addba_resp(sta->sdata, sta->sta.addr,
tid, dialog_token, status,
1, buf_size, timeout);
goto end;
}
ht_dbg_ratelimited(sta->sdata,
"unexpected AddBA Req from %pM on tid %u\n",
sta->sta.addr, tid);