---

yaml
---
r: 225234
b: refs/heads/master
c: a7ffac9
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a08e7ade9ddf4fe79576f953cc5c1725e944d26c
+refs/heads/master: a7ffac9591a2a0ee74c431396ae475a8d0caa51e

trunk/include/net/cfg80211.h

@@ -1468,6 +1468,9 @@ struct ieee80211_txrx_stypes {
  * @mgmt_stypes: bitmasks of frame subtypes that can be subscribed to or
  *	transmitted through nl80211, points to an array indexed by interface
  *	type
+ *
+ * @available_antennas: bitmap of antennas which are available to configure.
+ *	antenna configuration commands will be rejected unless this is set.
  */
 struct wiphy {
 	/* assign these fields before you register the wiphy */
@@ -1507,6 +1510,8 @@ struct wiphy {
 
 	u8 max_num_pmkids;
 
+	u32 available_antennas;
+
 	/* If multiple wiphys are registered and you're handed e.g.
 	 * a regular netdev with assigned ieee80211_ptr, you won't
 	 * know whether it points to a wiphy your driver has registered

trunk/net/wireless/nl80211.c

@@ -548,7 +548,7 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
 	if (dev->wiphy.flags & WIPHY_FLAG_CONTROL_PORT_PROTOCOL)
 		NLA_PUT_FLAG(msg, NL80211_ATTR_CONTROL_PORT_ETHERTYPE);
 
-	if (dev->ops->get_antenna) {
+	if (dev->wiphy.available_antennas && dev->ops->get_antenna) {
 		u32 tx_ant = 0, rx_ant = 0;
 		int res;
 		res = dev->ops->get_antenna(&dev->wiphy, &tx_ant, &rx_ant);
@@ -1046,14 +1046,25 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
 	if (info->attrs[NL80211_ATTR_WIPHY_ANTENNA_TX] &&
 	    info->attrs[NL80211_ATTR_WIPHY_ANTENNA_RX]) {
 		u32 tx_ant, rx_ant;
-		if (!rdev->ops->set_antenna) {
+		if (!rdev->wiphy.available_antennas || !rdev->ops->set_antenna) {
 			result = -EOPNOTSUPP;
 			goto bad_res;
 		}
 
 		tx_ant = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_ANTENNA_TX]);
 		rx_ant = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_ANTENNA_RX]);
 
+		/* reject antenna configurations which don't match the
+		 * available antenna mask, except for the "all" mask */
+		if ((~tx_ant && (tx_ant & ~rdev->wiphy.available_antennas)) ||
+		    (~rx_ant && (rx_ant & ~rdev->wiphy.available_antennas))) {
+			result = -EINVAL;
+			goto bad_res;
+		}
+
+		tx_ant = tx_ant & rdev->wiphy.available_antennas;
+		rx_ant = rx_ant & rdev->wiphy.available_antennas;
+
 		result = rdev->ops->set_antenna(&rdev->wiphy, tx_ant, rx_ant);
 		if (result)
 			goto bad_res;