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mac80211: Send Layer 2 Update frame on reassociation 

When a STA roams back to the same AP before the previous STA entry has
expired, a new STA entry is not added in mac80211. However, a Layer 2
Update frame still needs to be transmitted to update layer 2 devices
about the new location for the STA. Without this, switches may
continue to forward frames to the previous (now incorrect) port when
STA roams between APs.

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Jouni Malinen 2008-12-12 17:08:31 +02:00 committed by John W. Linville
parent 0fe45b1deb
commit b8d476c8cb
1 changed files with 11 additions and 2 deletions
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13
net/mac80211/cfg.c
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@ -686,6 +686,7 @@ static int ieee80211_add_station(struct wiphy *wiphy, struct net_device *dev,
struct sta_info *sta;
struct ieee80211_sub_if_data *sdata;
int err;
int layer2_update;
/* Prevent a race with changing the rate control algorithm */
if (!netif_running(dev))
@ -716,17 +717,25 @@ static int ieee80211_add_station(struct wiphy *wiphy, struct net_device *dev,
rate_control_rate_init(sta);
layer2_update = sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
sdata->vif.type == NL80211_IFTYPE_AP;
rcu_read_lock();
err = sta_info_insert(sta);
if (err) {
/* STA has been freed */
if (err == -EEXIST && layer2_update) {
/* Need to update layer 2 devices on reassociation */
sta = sta_info_get(local, mac);
if (sta)
ieee80211_send_layer2_update(sta);
}
rcu_read_unlock();
return err;
}
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
sdata->vif.type == NL80211_IFTYPE_AP)
if (layer2_update)
ieee80211_send_layer2_update(sta);
rcu_read_unlock();