From d8ec44335c974cc8bf67ce70c63071d4e0702509 Mon Sep 17 00:00:00 2001 From: Juuso Oikarinen Date: Fri, 1 Oct 2010 16:02:31 +0300 Subject: [PATCH] mac80211: Add validity check for beacon_crc value On association to an AP, after receiving beacons, the beacon_crc value is set. The beacon_crc value is not reset in disassociation, but the BSS data may be expired at a later point. When associating again, it's possible that a beacon for the AP is not received, resulting in the beacon_ies to remain NULL. After association, further beacons will not update the beacon data, as the crc value of the beacon has not changed, and the beacon_crc still holds a value matching the beacon. The beacon_ies will remain forever null. One of the results of this is that WLAN power save cannot be entered, the STA will remain foreven in active mode. Fix this by adding a validation flag for the beacon_crc, which is cleared on association. Signed-off-by: Juuso Oikarinen Acked-by: Johannes Berg Signed-off-by: John W. Linville --- net/mac80211/ieee80211_i.h | 1 + net/mac80211/mlme.c | 7 +++++-- 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index f6a6d78efcf0..55d79db985fc 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -369,6 +369,7 @@ struct ieee80211_if_managed { unsigned int flags; + bool beacon_crc_valid; u32 beacon_crc; enum { diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 77913a15f537..c37086a12f51 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -1639,7 +1639,7 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid); - if (ncrc != ifmgd->beacon_crc) { + if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) { ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); @@ -1670,9 +1670,10 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, } } - if (ncrc == ifmgd->beacon_crc) + if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) return; ifmgd->beacon_crc = ncrc; + ifmgd->beacon_crc_valid = true; if (elems.erp_info && elems.erp_info_len >= 1) { erp_valid = true; @@ -2214,6 +2215,8 @@ int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N; ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; + ifmgd->beacon_crc_valid = false; + for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || -- 2.20.1