From a58ce43f2fb17b728395ff530f019ca53c80145f Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Thu, 19 Nov 2009 12:45:42 +0100 Subject: mac80211: avoid spurious deauth frames/messages With WEXT, it happens frequently that the SME requests an authentication but then deauthenticates right away because some new parameters came along. Every time this happens we print a deauth message and send a deauth frame, but both of that is rather confusing. Avoid it by aborting the authentication process silently, and telling cfg80211 about that. The patch looks larger than it really is: __cfg80211_auth_remove() is split out from cfg80211_send_auth_timeout(), there's no new code except __cfg80211_auth_canceled() (a one-liner) and the mac80211 bits (7 new lines of code). Signed-off-by: Johannes Berg Signed-off-by: John W. Linville --- net/mac80211/mlme.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'net/mac80211') diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index f399547306c3..6dc7b5ad9a41 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -2508,6 +2508,7 @@ int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_mgd_work *wk; const u8 *bssid = NULL; + bool not_auth_yet = false; mutex_lock(&ifmgd->mtx); @@ -2517,12 +2518,28 @@ int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, } else list_for_each_entry(wk, &ifmgd->work_list, list) { if (&wk->bss->cbss == req->bss) { bssid = req->bss->bssid; + if (wk->state == IEEE80211_MGD_STATE_PROBE) + not_auth_yet = true; list_del(&wk->list); kfree(wk); break; } } + /* + * If somebody requests authentication and we haven't + * sent out an auth frame yet there's no need to send + * out a deauth frame either. If the state was PROBE, + * then this is the case. If it's AUTH we have sent a + * frame, and if it's IDLE we have completed the auth + * process already. + */ + if (not_auth_yet) { + mutex_unlock(&ifmgd->mtx); + __cfg80211_auth_canceled(sdata->dev, bssid); + return 0; + } + /* * cfg80211 should catch this ... but it's racy since * we can receive a deauth frame, process it, hand it -- cgit v1.2.3-59-g8ed1b