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nl80211: Filter unexpected interface added/up events

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It looks like a RTM_NEWLINK event claiming the interface to be UP is
delivered just before removing an interface after having first indicated
that the interface was going down/removed. Ignore this event if the
interface is not present anymore at the moment the event is processed.
This fixes issues where an interface that was re-added after being
removed did not get reconfigured properly.

Signed-hostap: Jouni Malinen <j@w1.fi>
intended-for: hostap-1
This commit is contained in:
Jouni Malinen 2012-02-18 13:13:23 +02:00
parent 8a6a1e1b14
commit d1f4942ba1
1 changed files with 28 additions and 2 deletions
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30
src/drivers/driver_nl80211.c
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@ -783,10 +783,28 @@ static void wpa_driver_nl80211_event_link(struct wpa_driver_nl80211_data *drv,
del ? "removed" : "added");
if (os_strcmp(drv->first_bss.ifname, event.interface_status.ifname) == 0) {
if (del)
if (del) {
if (drv->if_removed) {
wpa_printf(MSG_DEBUG, "nl80211: if_removed "
"already set - ignore event");
return;
}
drv->if_removed = 1;
else
} else {
if (if_nametoindex(drv->first_bss.ifname) == 0) {
wpa_printf(MSG_DEBUG, "nl80211: Interface %s "
"does not exist - ignore "
"RTM_NEWLINK",
drv->first_bss.ifname);
return;
}
if (!drv->if_removed) {
wpa_printf(MSG_DEBUG, "nl80211: if_removed "
"already cleared - ignore event");
return;
}
drv->if_removed = 0;
}
}
wpa_supplicant_event(drv->ctx, EVENT_INTERFACE_STATUS, &event);
@ -903,6 +921,14 @@ static void wpa_driver_nl80211_event_rtm_newlink(void *ctx,
wpa_printf(MSG_DEBUG, "nl80211: Ignore interface up "
"event since interface %s is down",
namebuf);
} else if (if_nametoindex(drv->first_bss.ifname) == 0) {
wpa_printf(MSG_DEBUG, "nl80211: Ignore interface up "
"event since interface %s does not exist",
drv->first_bss.ifname);
} else if (drv->if_removed) {
wpa_printf(MSG_DEBUG, "nl80211: Ignore interface up "
"event since interface %s is marked "
"removed", drv->first_bss.ifname);
} else {
wpa_printf(MSG_DEBUG, "nl80211: Interface up");
drv->if_disabled = 0;