cfg80211: identically validate beacon interval for AP/MESH/IBSS

Beacon interval interface combinations validation was missing
for MESH/IBSS join, add those.

Johannes: also move the beacon interval check disallowing really
tiny and really big intervals into the common function, which
adds it for AP mode.

Signed-off-by: Purushottam Kushwaha <[email protected]>
Signed-off-by: Johannes Berg <[email protected]>

Author: Purushottam Kushwaha

net/wireless/nl80211.c

@@ -7752,12 +7752,13 @@ static int nl80211_join_ibss(struct sk_buff *skb, struct genl_info *info)
 
 	ibss.beacon_interval = 100;
 
-	if (info->attrs[NL80211_ATTR_BEACON_INTERVAL]) {
+	if (info->attrs[NL80211_ATTR_BEACON_INTERVAL])
 		ibss.beacon_interval =
 			nla_get_u32(info->attrs[NL80211_ATTR_BEACON_INTERVAL]);
-		if (ibss.beacon_interval < 1 || ibss.beacon_interval > 10000)
-			return -EINVAL;
-	}
+
+	err = cfg80211_validate_beacon_int(rdev, ibss.beacon_interval);
+	if (err)
+		return err;
 
 	if (!rdev->ops->join_ibss)
 		return -EOPNOTSUPP;
@@ -9231,9 +9232,10 @@ static int nl80211_join_mesh(struct sk_buff *skb, struct genl_info *info)
 	if (info->attrs[NL80211_ATTR_BEACON_INTERVAL]) {
 		setup.beacon_interval =
 			nla_get_u32(info->attrs[NL80211_ATTR_BEACON_INTERVAL]);
-		if (setup.beacon_interval < 10 ||
-		    setup.beacon_interval > 10000)
-			return -EINVAL;
+
+		err = cfg80211_validate_beacon_int(rdev, setup.beacon_interval);
+		if (err)
+			return err;
 	}
 
 	if (info->attrs[NL80211_ATTR_DTIM_PERIOD]) {

net/wireless/util.c

@@ -1559,7 +1559,7 @@ int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
 	struct wireless_dev *wdev;
 	int res = 0;
 
-	if (!beacon_int)
+	if (beacon_int < 10 || beacon_int > 10000)
 		return -EINVAL;
 
 	list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {