[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>

5 files changed, 57 insertions, 63 deletions

diff --git a/net/mac80211/Makefile b/net/mac80211/Makefile
index 122b23eb15d..79373383562 100644
--- a/net/mac80211/Makefile
+++ b/net/mac80211/Makefile
@@ -22,4 +22,5 @@ mac80211-objs := \
 	tx.o \
 	key.o \
 	util.o \
+	event.o \
 	$(mac80211-objs-y)
diff --git a/net/mac80211/event.c b/net/mac80211/event.c
new file mode 100644
index 00000000000..68a526cb762
--- /dev/null
+++ b/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
+	 */
+}
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index c771b7a7695..9c5fd861eb7 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -823,5 +823,7 @@ u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len);
 int ieee80211_is_eapol(const struct sk_buff *skb);
 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 			     int rate, int erp, int short_preamble);
+void mac80211_ev_michael_mic_failure(struct net_device *dev, int keyidx,
+				     struct ieee80211_hdr *hdr);
 
 #endif /* IEEE80211_I_H */
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 08ca066246b..5a66269d943 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -13,7 +13,6 @@
 #include <linux/skbuff.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
-#include <net/iw_handler.h>
 #include <net/mac80211.h>
 #include <net/ieee80211_radiotap.h>
 
@@ -1206,20 +1205,17 @@ static void ieee80211_rx_michael_mic_report(struct net_device *dev,
 	}
 
 	if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
-	    rx->sdata->type == IEEE80211_IF_TYPE_AP) {
-		keyidx = ieee80211_wep_get_keyidx(rx->skb);
+	    rx->sdata->type == IEEE80211_IF_TYPE_AP && keyidx) {
 		/* AP with Pairwise keys support should never receive Michael
 		 * MIC errors for non-zero keyidx because these are reserved
 		 * for group keys and only the AP is sending real multicast
 		 * frames in BSS. */
-		if (keyidx) {
-			if (net_ratelimit())
-				printk(KERN_DEBUG "%s: ignored Michael MIC "
-				       "error for a frame with non-zero keyidx"
-				       " (%d) (src " MAC_FMT ")\n", dev->name,
-				       keyidx, MAC_ARG(hdr->addr2));
-			goto ignore;
-		}
+		if (net_ratelimit())
+			printk(KERN_DEBUG "%s: ignored Michael MIC error for "
+			       "a frame with non-zero keyidx (%d)"
+			       " (src " MAC_FMT ")\n", dev->name, keyidx,
+			       MAC_ARG(hdr->addr2));
+		goto ignore;
 	}
 
 	if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
@@ -1233,32 +1229,11 @@ static void ieee80211_rx_michael_mic_report(struct net_device *dev,
 		goto ignore;
 	}
 
-	do {
-		union iwreq_data wrqu;
-		char *buf = kmalloc(128, GFP_ATOMIC);
-		if (!buf)
-			break;
-
-		/* 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(rx->dev, IWEVCUSTOM, &wrqu, buf);
-		kfree(buf);
-	} while (0);
-
 	/* TODO: consider verifying the MIC error report with software
 	 * implementation if we get too many spurious reports from the
 	 * hardware. */
-	if (!rx->local->apdev)
-		goto ignore;
-	ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
-			  ieee80211_msg_michael_mic_failure);
-	return;
 
+	mac80211_ev_michael_mic_failure(rx->dev, keyidx, hdr);
  ignore:
 	dev_kfree_skb(rx->skb);
 	rx->skb = NULL;
diff --git a/net/mac80211/wpa.c b/net/mac80211/wpa.c
index f5723ea15aa..742b5585d1b 100644
--- a/net/mac80211/wpa.c
+++ b/net/mac80211/wpa.c
@@ -11,10 +11,8 @@
 #include <linux/slab.h>
 #include <linux/skbuff.h>
 #include <linux/compiler.h>
-#include <net/iw_handler.h>
-
 #include <net/mac80211.h>
-#include "ieee80211_common.h"
+
 #include "ieee80211_i.h"
 #include "michael.h"
 #include "tkip.h"
@@ -181,33 +179,9 @@ ieee80211_rx_h_michael_mic_verify(struct ieee80211_txrx_data *rx)
 		printk(KERN_DEBUG "%s: invalid Michael MIC in data frame from "
 		       MAC_FMT "\n", rx->dev->name, MAC_ARG(sa));
 
-		do {
-			struct ieee80211_hdr *hdr;
-			union iwreq_data wrqu;
-			char *buf = kmalloc(128, GFP_ATOMIC);
-			if (!buf)
-				break;
-
-			/* TODO: needed parameters: count, key type, TSC */
-			hdr = (struct ieee80211_hdr *) skb->data;
-			sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
-				"keyid=%d %scast addr=" MAC_FMT ")",
-				rx->key->keyidx,
-				hdr->addr1[0] & 0x01 ? "broad" : "uni",
-				MAC_ARG(hdr->addr2));
-			memset(&wrqu, 0, sizeof(wrqu));
-			wrqu.data.length = strlen(buf);
-			wireless_send_event(rx->dev, IWEVCUSTOM, &wrqu, buf);
-			kfree(buf);
-		} while (0);
-
-		if (!rx->local->apdev)
-			return TXRX_DROP;
-
-		ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
-				  ieee80211_msg_michael_mic_failure);
-
-		return TXRX_QUEUED;
+		mac80211_ev_michael_mic_failure(rx->dev, rx->key->keyidx,
+						(void *) skb->data);
+		return TXRX_DROP;
 	}
 
  remove_mic: