cfg80211: add event for unexpected 4addr frames
The frames are used by AP/STA WDS mode, and hostapd
needs to know when such a frame was received to set
up the VLAN appropriately to allow using it.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index c29a284..09474ab 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -517,7 +517,13 @@
* For the event, the %NL80211_ATTR_MAC attribute carries the TA and
* other attributes like the interface index are present.
* If used as the command it must have an interface index and you can
- * only unsubscribe from the event by closing the socket.
+ * only unsubscribe from the event by closing the socket. Subscription
+ * is also for %NL80211_CMD_UNEXPECTED_4ADDR_FRAME events.
+ *
+ * @NL80211_CMD_UNEXPECTED_4ADDR_FRAME: Sent as an event indicating that the
+ * associated station identified by %NL80211_ATTR_MAC sent a 4addr frame
+ * and wasn't already in a 4-addr VLAN. The event will be sent similarly
+ * to the %NL80211_CMD_UNEXPECTED_FRAME event, to the same listener.
*
* @NL80211_CMD_PROBE_CLIENT: Probe an associated station on an AP interface
* by sending a null data frame to it and reporting when the frame is
@@ -667,6 +673,8 @@
NL80211_CMD_REGISTER_BEACONS,
+ NL80211_CMD_UNEXPECTED_4ADDR_FRAME,
+
/* add new commands above here */
/* used to define NL80211_CMD_MAX below */
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index d01307f..be3535f 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -3227,6 +3227,22 @@
const u8 *addr, gfp_t gfp);
/**
+ * cfg80211_rx_unexpected_4addr_frame - inform about unexpected WDS frame
+ * @dev: The device the frame matched to
+ * @addr: the transmitter address
+ * @gfp: context flags
+ *
+ * This function is used in AP mode (only!) to inform userspace that
+ * an associated station sent a 4addr frame but that wasn't expected.
+ * It is allowed and desirable to send this event only once for each
+ * station to avoid event flooding.
+ * Returns %true if the frame was passed to userspace (or this failed
+ * for a reason other than not having a subscription.)
+ */
+bool cfg80211_rx_unexpected_4addr_frame(struct net_device *dev,
+ const u8 *addr, gfp_t gfp);
+
+/**
* cfg80211_probe_status - notify userspace about probe status
* @dev: the device the probe was sent on
* @addr: the address of the peer
diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index f4d868b..34891e0 100644
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -1123,3 +1123,17 @@
return nl80211_unexpected_frame(dev, addr, gfp);
}
EXPORT_SYMBOL(cfg80211_rx_spurious_frame);
+
+bool cfg80211_rx_unexpected_4addr_frame(struct net_device *dev,
+ const u8 *addr, gfp_t gfp)
+{
+ struct wireless_dev *wdev = dev->ieee80211_ptr;
+
+ if (WARN_ON(wdev->iftype != NL80211_IFTYPE_AP &&
+ wdev->iftype != NL80211_IFTYPE_P2P_GO &&
+ wdev->iftype != NL80211_IFTYPE_AP_VLAN))
+ return false;
+
+ return nl80211_unexpected_4addr_frame(dev, addr, gfp);
+}
+EXPORT_SYMBOL(cfg80211_rx_unexpected_4addr_frame);
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 68b6708..5b65906 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -7289,7 +7289,8 @@
nlmsg_free(msg);
}
-bool nl80211_unexpected_frame(struct net_device *dev, const u8 *addr, gfp_t gfp)
+static bool __nl80211_unexpected_frame(struct net_device *dev, u8 cmd,
+ const u8 *addr, gfp_t gfp)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
@@ -7305,7 +7306,7 @@
if (!msg)
return true;
- hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_UNEXPECTED_FRAME);
+ hdr = nl80211hdr_put(msg, 0, 0, 0, cmd);
if (!hdr) {
nlmsg_free(msg);
return true;
@@ -7330,6 +7331,20 @@
return true;
}
+bool nl80211_unexpected_frame(struct net_device *dev, const u8 *addr, gfp_t gfp)
+{
+ return __nl80211_unexpected_frame(dev, NL80211_CMD_UNEXPECTED_FRAME,
+ addr, gfp);
+}
+
+bool nl80211_unexpected_4addr_frame(struct net_device *dev,
+ const u8 *addr, gfp_t gfp)
+{
+ return __nl80211_unexpected_frame(dev,
+ NL80211_CMD_UNEXPECTED_4ADDR_FRAME,
+ addr, gfp);
+}
+
int nl80211_send_mgmt(struct cfg80211_registered_device *rdev,
struct net_device *netdev, u32 nlpid,
int freq, const u8 *buf, size_t len, gfp_t gfp)
diff --git a/net/wireless/nl80211.h b/net/wireless/nl80211.h
index d94456e..12bf4d1 100644
--- a/net/wireless/nl80211.h
+++ b/net/wireless/nl80211.h
@@ -119,5 +119,7 @@
bool nl80211_unexpected_frame(struct net_device *dev,
const u8 *addr, gfp_t gfp);
+bool nl80211_unexpected_4addr_frame(struct net_device *dev,
+ const u8 *addr, gfp_t gfp);
#endif /* __NET_WIRELESS_NL80211_H */