From: Herton Ronaldo Krzesinski Date: Tue, 10 Mar 2009 13:11:09 +0000 (-0300) Subject: mac80211: deauth before flushing STA information X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=1a28c78b46caec7628985728e7f0c4aef68e33e7;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git mac80211: deauth before flushing STA information Even after commit "mac80211: deauth when interface is marked down" (e327b847 on Linus tree), userspace still isn't notified when interface goes down. There isn't a problem with this commit, but because of other code changes it doesn't work on kernels >= 2.6.28 (works if same/similar change applied on 2.6.27 for example). The issue is as follows: after commit "mac80211: restructure disassoc/deauth flows" in 2.6.28, the call to ieee80211_sta_deauthenticate added by commit e327b847 will not work: because we do sta_info_flush(local, sdata) inside ieee80211_stop (iface.c), all stations in interface are cleared, so when calling ieee80211_sta_deauthenticate->ieee80211_set_disassoc (mlme.c), inside ieee80211_set_disassoc we have this in the beginning: sta = sta_info_get(local, ifsta->bssid); if (!sta) { The !sta check triggers, thus the function returns early and ieee80211_sta_send_apinfo(sdata, ifsta) later isn't called, so wpa_supplicant/userspace isn't notified with SIOCGIWAP. This commit moves deauthentication to before flushing STA info (sta_info_flush), thus the above can't happen and userspace is really notified when interface goes down. Signed-off-by: Herton Ronaldo Krzesinski Signed-off-by: John W. Linville --- diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c index 2acc416e77e..f9f27b9cadb 100644 --- a/net/mac80211/iface.c +++ b/net/mac80211/iface.c @@ -369,6 +369,18 @@ static int ieee80211_stop(struct net_device *dev) rcu_read_unlock(); + /* + * Announce that we are leaving the network, in case we are a + * station interface type. This must be done before removing + * all stations associated with sta_info_flush, otherwise STA + * information will be gone and no announce being done. + */ + if (sdata->vif.type == NL80211_IFTYPE_STATION) { + if (sdata->u.mgd.state != IEEE80211_STA_MLME_DISABLED) + ieee80211_sta_deauthenticate(sdata, + WLAN_REASON_DEAUTH_LEAVING); + } + /* * Remove all stations associated with this interface. * @@ -454,10 +466,6 @@ static int ieee80211_stop(struct net_device *dev) netif_addr_unlock_bh(local->mdev); break; case NL80211_IFTYPE_STATION: - /* Announce that we are leaving the network. */ - if (sdata->u.mgd.state != IEEE80211_STA_MLME_DISABLED) - ieee80211_sta_deauthenticate(sdata, - WLAN_REASON_DEAUTH_LEAVING); memset(sdata->u.mgd.bssid, 0, ETH_ALEN); del_timer_sync(&sdata->u.mgd.chswitch_timer); del_timer_sync(&sdata->u.mgd.timer);