[MAC80211]: refactor event sending

Create a new file event.c that will contain code to send mac/mlme
events to userspace. For now put the Michael MIC failure condition
into it and remove sending of that condition via the management
interface, hostapd interestingly doesn't do anything when it gets
such a packet besides printing a message, it reacts only on the
private iwevent.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Michael Wu <flamingice@sourmilk.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/mac80211/event.c

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * mac80211 - events
+ */
+
+#include <linux/netdevice.h>
+#include <net/iw_handler.h>
+#include "ieee80211_i.h"
+
+/*
+ * indicate a failed Michael MIC to userspace; the passed packet
+ * (in the variable hdr) must be long enough to extract the TKIP
+ * fields like TSC
+ */
+void mac80211_ev_michael_mic_failure(struct net_device *dev, int keyidx,
+				     struct ieee80211_hdr *hdr)
+{
+	union iwreq_data wrqu;
+	char *buf = kmalloc(128, GFP_ATOMIC);
+
+	if (buf) {
+		/* TODO: needed parameters: count, key type, TSC */
+		sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
+			"keyid=%d %scast addr=" MAC_FMT ")",
+			keyidx, hdr->addr1[0] & 0x01 ? "broad" : "uni",
+			MAC_ARG(hdr->addr2));
+		memset(&wrqu, 0, sizeof(wrqu));
+		wrqu.data.length = strlen(buf);
+		wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
+		kfree(buf);
+	}
+
+	/*
+	 * TODO: re-add support for sending MIC failure indication
+	 * with all info via nl80211
+	 */
+}