[PATCH v2 resend] cfg80211: disallow interfering with stations on non-AP

[Johannes Berg <johannes@sipsolutions.net>]

On non-AP interfaces userspace has no business interfering with
the station management, this can confuse mac80211 (and other
drivers probably wouldn't support it anyway). Allow adding and
removing stations only on AP interfaces.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
---
 net/wireless/nl80211.c |   12 ++++++++++++
 1 file changed, 12 insertions(+)

--- wireless-testing.orig/net/wireless/nl80211.c	2009-05-26 10:01:42.000000000 +0200
+++ wireless-testing/net/wireless/nl80211.c	2009-05-26 10:01:44.000000000 +0200
@@ -1687,6 +1687,12 @@ static int nl80211_set_station(struct sk
 	if (err)
 		goto out_rtnl;
 
+	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_AP &&
+	    dev->ieee80211_ptr->iftype != NL80211_IFTYPE_AP_VLAN) {
+		err = -EINVAL;
+		goto out;
+	}
+
 	err = get_vlan(info->attrs[NL80211_ATTR_STA_VLAN], drv, &params.vlan);
 	if (err)
 		goto out;
@@ -1811,6 +1817,12 @@ static int nl80211_del_station(struct sk
 		goto out;
 	}
 
+	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_AP &&
+	    dev->ieee80211_ptr->iftype != NL80211_IFTYPE_AP_VLAN) {
+		err = -EINVAL;
+		goto out;
+	}
+
 	if (!drv->ops->del_station) {
 		err = -EOPNOTSUPP;
 		goto out;