cfg80211: disallow more station changes
The following changes are invalid and should be
disallowed when a station already exists:
* supported rates changes, except for TDLS peers
* listen interval changes
* HT capability changes
Disallow them and also update a mac80211 comment
explaining how they would be racy.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 087f68b..9bd8340 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -3188,13 +3188,9 @@
nla_len(info->attrs[NL80211_ATTR_STA_SUPPORTED_RATES]);
}
- if (info->attrs[NL80211_ATTR_STA_LISTEN_INTERVAL])
- params.listen_interval =
- nla_get_u16(info->attrs[NL80211_ATTR_STA_LISTEN_INTERVAL]);
-
- if (info->attrs[NL80211_ATTR_HT_CAPABILITY])
- params.ht_capa =
- nla_data(info->attrs[NL80211_ATTR_HT_CAPABILITY]);
+ if (info->attrs[NL80211_ATTR_STA_LISTEN_INTERVAL] ||
+ info->attrs[NL80211_ATTR_HT_CAPABILITY])
+ return -EINVAL;
if (!rdev->ops->change_station)
return -EOPNOTSUPP;
@@ -3246,6 +3242,10 @@
BIT(NL80211_STA_FLAG_ASSOCIATED)))
return -EINVAL;
+ /* reject other things that can't change */
+ if (params.supported_rates)
+ return -EINVAL;
+
/* must be last in here for error handling */
params.vlan = get_vlan(info, rdev);
if (IS_ERR(params.vlan))
@@ -3265,10 +3265,6 @@
/* disallow things sta doesn't support */
if (params.plink_action)
return -EINVAL;
- if (params.ht_capa)
- return -EINVAL;
- if (params.listen_interval >= 0)
- return -EINVAL;
/* reject any changes other than AUTHORIZED */
if (params.sta_flags_mask & ~BIT(NL80211_STA_FLAG_AUTHORIZED))
return -EINVAL;
@@ -3277,9 +3273,7 @@
/* disallow things mesh doesn't support */
if (params.vlan)
return -EINVAL;
- if (params.ht_capa)
- return -EINVAL;
- if (params.listen_interval >= 0)
+ if (params.supported_rates)
return -EINVAL;
/*
* No special handling for TDLS here -- the userspace