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mac80211: dont try to use existing sta for AP

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Clean out some cruft that could use an already existing
sta_info struct -- that case cannot happen. Also, there's
a bug there -- if allocation/insertion fails then it is
possible that we are left in a lingering state where
mac80211 waits for the AP, cfg80211 waits for mac80211,
but the AP has already replied. Since there's no way to
indicate an internal error, pretend there was a timeout,
i.e. that the AP never responded.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2009-12-02 12:43:43 +01:00 committed by John W. Linville
parent 5fba4af32c
commit 5d1ec85f00
1 changed files with 24 additions and 33 deletions
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57
net/mac80211/mlme.c
View file

@ -75,6 +75,9 @@ enum rx_mgmt_action {
/* caller must call cfg80211_send_disassoc() */
RX_MGMT_CFG80211_DISASSOC,
/* caller must tell cfg80211 about internal error */
RX_MGMT_CFG80211_ASSOC_ERROR,
/* caller must call cfg80211_auth_timeout() & free work */
RX_MGMT_CFG80211_AUTH_TO,
@ -1479,8 +1482,8 @@ ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
u8 *pos;
u32 changed = 0;
int i, j;
bool have_higher_than_11mbit = false, newsta = false;
int i, j, err;
bool have_higher_than_11mbit = false;
u16 ap_ht_cap_flags;
/*
@ -1542,30 +1545,18 @@ ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
printk(KERN_DEBUG "%s: associated\n", sdata->name);
ifmgd->aid = aid;
rcu_read_lock();
/* Add STA entry for the AP */
sta = sta_info_get(sdata, wk->bss->cbss.bssid);
sta = sta_info_alloc(sdata, wk->bss->cbss.bssid, GFP_KERNEL);
if (!sta) {
newsta = true;
rcu_read_unlock();
sta = sta_info_alloc(sdata, wk->bss->cbss.bssid, GFP_KERNEL);
if (!sta) {
printk(KERN_DEBUG "%s: failed to alloc STA entry for"
" the AP\n", sdata->name);
return RX_MGMT_NONE;
}
set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
WLAN_STA_ASSOC_AP);
if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
set_sta_flags(sta, WLAN_STA_AUTHORIZED);
rcu_read_lock();
printk(KERN_DEBUG "%s: failed to alloc STA entry for"
" the AP\n", sdata->name);
return RX_MGMT_CFG80211_ASSOC_ERROR;
}
set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
WLAN_STA_ASSOC_AP);
if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
set_sta_flags(sta, WLAN_STA_AUTHORIZED);
rates = 0;
basic_rates = 0;
sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
@ -1628,18 +1619,14 @@ ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
if (elems.wmm_param)
set_sta_flags(sta, WLAN_STA_WME);
if (newsta) {
int err = sta_info_insert(sta);
if (err) {
printk(KERN_DEBUG "%s: failed to insert STA entry for"
" the AP (error %d)\n", sdata->name, err);
rcu_read_unlock();
return RX_MGMT_NONE;
}
err = sta_info_insert(sta);
sta = NULL;
if (err) {
printk(KERN_DEBUG "%s: failed to insert STA entry for"
" the AP (error %d)\n", sdata->name, err);
return RX_MGMT_CFG80211_ASSOC_ERROR;
}
rcu_read_unlock();
if (elems.wmm_param)
ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
elems.wmm_param_len);
@ -2084,6 +2071,10 @@ static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
case RX_MGMT_CFG80211_DEAUTH:
cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
break;
case RX_MGMT_CFG80211_ASSOC_ERROR:
/* an internal error -- pretend timeout for now */
cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
break;
default:
WARN(1, "unexpected: %d", rma);
}