openwrt-xburst/package/madwifi/patches/309-micfail_detect.patch

--- a/ath/if_ath.c
+++ b/ath/if_ath.c
@@ -6459,6 +6459,7 @@
 	int type;
 	u_int phyerr;
 	u_int processed = 0, early_stop = 0;
+	u_int mic_fail = 0;
 
 	DPRINTF(sc, ATH_DEBUG_RX_PROC, "invoked\n");
 process_rx_again:
@@ -6560,24 +6561,8 @@
 			}
 			if (rs->rs_status & HAL_RXERR_MIC) {
 				sc->sc_stats.ast_rx_badmic++;
-				/*
-				 * Do minimal work required to hand off
-				 * the 802.11 header for notification.
-				 */
-				/* XXX frag's and QoS frames */
-				if (len >= sizeof (struct ieee80211_frame)) {
-					bus_dma_sync_single(sc->sc_bdev,
-					    bf->bf_skbaddr, len,
-					    BUS_DMA_FROMDEVICE);
-#if 0
-/* XXX revalidate MIC, lookup ni to find VAP */
-					ieee80211_notify_michael_failure(ic,
-					    (struct ieee80211_frame *)skb->data,
-					    sc->sc_splitmic ?
-					        rs->rs_keyix - 32 : rs->rs_keyix
-					);
-#endif
-				}
+				mic_fail = 1;
+				goto rx_accept;
 			}
 			/*
 			 * Reject error frames if we have no vaps that
@@ -6616,8 +6601,9 @@
 		/*
 		 * Finished monitor mode handling, now reject
 		 * error frames before passing to other vaps
+		 * Ignore MIC failures here, as we need to recheck them
 		 */
-		if (rs->rs_status != 0) {
+		if (rs->rs_status & ~(HAL_RXERR_MIC | HAL_RXERR_DECRYPT)) {
 			ieee80211_dev_kfree_skb(&skb);
 			goto rx_next;
 		}
@@ -6625,6 +6611,26 @@
 		/* remove the CRC */
 		skb_trim(skb, skb->len - IEEE80211_CRC_LEN);
 
+		if (mic_fail) {
+			/* Ignore control frames which are reported with mic error */
+		    if ((((struct ieee80211_frame *)skb->data)->i_fc[0] &
+					IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL)
+				goto drop_micfail;
+
+			ni = ieee80211_find_rxnode(ic, (const struct ieee80211_frame_min *) skb->data);
+
+			if (ni && ni->ni_table) {
+				ieee80211_check_mic(ni, skb);
+				ieee80211_unref_node(&ni);
+			}
+
+drop_micfail:
+			dev_kfree_skb_any(skb);
+			skb = NULL;
+			mic_fail = 0;
+			goto rx_next;
+		}
+
 		/*
 		 * From this point on we assume the frame is at least
 		 * as large as ieee80211_frame_min; verify that.
@@ -6637,6 +6643,7 @@
 			goto rx_next;
 		}
 
+		/* MIC failure. Drop the packet in any case */
 		/*
 		 * Normal receive.
 		 */
--- a/net80211/ieee80211_crypto_ccmp.c
+++ b/net80211/ieee80211_crypto_ccmp.c
@@ -73,7 +73,7 @@
 static int ccmp_encap(struct ieee80211_key *, struct sk_buff *, u_int8_t);
 static int ccmp_decap(struct ieee80211_key *, struct sk_buff *, int);
 static int ccmp_enmic(struct ieee80211_key *, struct sk_buff *, int);
-static int ccmp_demic(struct ieee80211_key *, struct sk_buff *, int);
+static int ccmp_demic(struct ieee80211_key *, struct sk_buff *, int, int);
 
 static const struct ieee80211_cipher ccmp = {
 	.ic_name	= "AES-CCM",
@@ -308,7 +308,7 @@
  * Verify and strip MIC from the frame.
  */
 static int
-ccmp_demic(struct ieee80211_key *k, struct sk_buff *skb, int hdrlen)
+ccmp_demic(struct ieee80211_key *k, struct sk_buff *skb, int hdrlen, int force)
 {
 	return 1;
 }
--- a/net80211/ieee80211_crypto.h
+++ b/net80211/ieee80211_crypto.h
@@ -145,7 +145,7 @@
 	int (*ic_encap)(struct ieee80211_key *, struct sk_buff *, u_int8_t);
 	int (*ic_decap)(struct ieee80211_key *, struct sk_buff *, int);
 	int (*ic_enmic)(struct ieee80211_key *, struct sk_buff *, int);
-	int (*ic_demic)(struct ieee80211_key *, struct sk_buff *, int);
+	int (*ic_demic)(struct ieee80211_key *, struct sk_buff *, int, int);
 };
 extern const struct ieee80211_cipher ieee80211_cipher_none;
 
@@ -163,10 +163,10 @@
  */
 static __inline int
 ieee80211_crypto_demic(struct ieee80211vap *vap, struct ieee80211_key *k,
-	struct sk_buff *skb, int hdrlen)
+	struct sk_buff *skb, int hdrlen, int force)
 {
 	const struct ieee80211_cipher *cip = k->wk_cipher;
-	return (cip->ic_miclen > 0 ? cip->ic_demic(k, skb, hdrlen) : 1);
+	return (cip->ic_miclen > 0 ? cip->ic_demic(k, skb, hdrlen, force) : 1);
 }
 
 /*
--- a/net80211/ieee80211_crypto_none.c
+++ b/net80211/ieee80211_crypto_none.c
@@ -52,7 +52,7 @@
 static int none_encap(struct ieee80211_key *, struct sk_buff *, u_int8_t);
 static int none_decap(struct ieee80211_key *, struct sk_buff *, int);
 static int none_enmic(struct ieee80211_key *, struct sk_buff *, int);
-static int none_demic(struct ieee80211_key *, struct sk_buff *, int);
+static int none_demic(struct ieee80211_key *, struct sk_buff *, int, int);
 
 const struct ieee80211_cipher ieee80211_cipher_none = {
 	.ic_name	= "NONE",
@@ -137,7 +137,7 @@
 }
 
 static int
-none_demic(struct ieee80211_key *k, struct sk_buff *skb, int hdrlen)
+none_demic(struct ieee80211_key *k, struct sk_buff *skb, int hdrlen, int force)
 {
 	struct ieee80211vap *vap = k->wk_private;
 
--- a/net80211/ieee80211_crypto_tkip.c
+++ b/net80211/ieee80211_crypto_tkip.c
@@ -57,7 +57,7 @@
 static int tkip_encap(struct ieee80211_key *, struct sk_buff *, u_int8_t);
 static int tkip_enmic(struct ieee80211_key *, struct sk_buff *, int);
 static int tkip_decap(struct ieee80211_key *, struct sk_buff *, int);
-static int tkip_demic(struct ieee80211_key *, struct sk_buff *, int);
+static int tkip_demic(struct ieee80211_key *, struct sk_buff *, int, int);
 
 static const struct ieee80211_cipher tkip  = {
 	.ic_name	= "TKIP",
@@ -339,7 +339,7 @@
  * Verify and strip MIC from the frame.
  */
 static int
-tkip_demic(struct ieee80211_key *k, struct sk_buff *skb0, int hdrlen)
+tkip_demic(struct ieee80211_key *k, struct sk_buff *skb0, int hdrlen, int force)
 {
 	struct tkip_ctx *ctx = k->wk_private;
 	struct sk_buff *skb;
@@ -355,7 +355,7 @@
 	}
 	wh = (struct ieee80211_frame *) skb0->data;
 	/* NB: skb left pointing at last in chain */
-	if (k->wk_flags & IEEE80211_KEY_SWMIC) {
+	if ((k->wk_flags & IEEE80211_KEY_SWMIC) || force) {
 		struct ieee80211vap *vap = ctx->tc_vap;
 		u8 mic[IEEE80211_WEP_MICLEN];
 		u8 mic0[IEEE80211_WEP_MICLEN];
--- a/net80211/ieee80211_crypto_wep.c
+++ b/net80211/ieee80211_crypto_wep.c
@@ -54,7 +54,7 @@
 static int wep_encap(struct ieee80211_key *, struct sk_buff *, u_int8_t);
 static int wep_decap(struct ieee80211_key *, struct sk_buff *, int);
 static int wep_enmic(struct ieee80211_key *, struct sk_buff *, int);
-static int wep_demic(struct ieee80211_key *, struct sk_buff *, int);
+static int wep_demic(struct ieee80211_key *, struct sk_buff *, int, int);
 
 static const struct ieee80211_cipher wep = {
 	.ic_name	= "WEP",
@@ -244,7 +244,7 @@
  * Verify and strip MIC from the frame.
  */
 static int
-wep_demic(struct ieee80211_key *k, struct sk_buff *skb, int hdrlen)
+wep_demic(struct ieee80211_key *k, struct sk_buff *skb, int hdrlen, int force)
 {
 	return 1;
 }
--- a/net80211/ieee80211_input.c
+++ b/net80211/ieee80211_input.c
@@ -669,7 +669,7 @@
 		 * Next strip any MSDU crypto bits.
 		 */
 		if (key != NULL &&
-		    !ieee80211_crypto_demic(vap, key, skb, hdrspace)) {
+		    !ieee80211_crypto_demic(vap, key, skb, hdrspace, 0)) {
 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 				ni->ni_macaddr, "data", "%s", "demic error");
 			IEEE80211_NODE_STAT(ni, rx_demicfail);
@@ -4293,6 +4293,47 @@
 }
 #endif
 
+/*
+ * Process a frame w/ hw detected MIC failure.
+ * The frame will be dropped in any case.
+ */
+void
+ieee80211_check_mic(struct ieee80211_node *ni, struct sk_buff *skb)
+{
+	struct ieee80211vap *vap = ni->ni_vap;
+
+	struct ieee80211_frame *wh;
+	struct ieee80211_key *key;
+	int hdrspace;
+	struct ieee80211com *ic = vap->iv_ic;
+
+	if (skb->len < sizeof(struct ieee80211_frame_min)) {
+		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
+		    ni->ni_macaddr, NULL,
+		    "too short (1): len %u", skb->len);
+		vap->iv_stats.is_rx_tooshort++;
+		return;
+	}
+
+	wh = (struct ieee80211_frame *)skb->data;
+
+	hdrspace = ieee80211_hdrspace(ic, wh);
+	key = ieee80211_crypto_decap(ni, skb, hdrspace);
+	if (key == NULL) {
+		/* NB: stats+msgs handled in crypto_decap */
+		IEEE80211_NODE_STAT(ni, rx_wepfail);
+		return;
+	}
+
+	if (!ieee80211_crypto_demic(vap, key, skb, hdrspace, 1)) {
+		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
+			ni->ni_macaddr, "data", "%s", "demic error");
+			IEEE80211_NODE_STAT(ni, rx_demicfail);
+	}
+	return;
+}
+EXPORT_SYMBOL(ieee80211_check_mic);
+
 #ifdef IEEE80211_DEBUG
 /*
  * Debugging support.
--- a/net80211/ieee80211_proto.h
+++ b/net80211/ieee80211_proto.h
@@ -90,6 +90,7 @@
 void ieee80211_set11gbasicrates(struct ieee80211_rateset *, enum ieee80211_phymode);
 enum ieee80211_phymode ieee80211_get11gbasicrates(struct ieee80211_rateset *);
 void ieee80211_send_pspoll(struct ieee80211_node *);
+void ieee80211_check_mic(struct ieee80211_node *, struct sk_buff *);
 
 /*
  * Return the size of the 802.11 header for a management or data frame.
--- a/net80211/ieee80211_linux.c
+++ b/net80211/ieee80211_linux.c
@@ -337,8 +337,8 @@
 	/* TODO: needed parameters: count, keyid, key type, src address, TSC */
 	snprintf(buf, sizeof(buf), "%s(keyid=%d %scast addr=" MAC_FMT ")", tag,
 		k->wk_keyix,
-		IEEE80211_IS_MULTICAST(wh->i_addr1) ?  "broad" : "uni",
-		MAC_ADDR(wh->i_addr1));
+		IEEE80211_IS_MULTICAST(wh->i_addr2) ?  "broad" : "uni",
+		MAC_ADDR(wh->i_addr2));
 	memset(&wrqu, 0, sizeof(wrqu));
 	wrqu.data.length = strlen(buf);
 	wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
--- a/net80211/ieee80211_output.c
+++ b/net80211/ieee80211_output.c
@@ -1074,13 +1074,16 @@
 			cip = (struct ieee80211_cipher *) key->wk_cipher;
 			ciphdrsize = cip->ic_header;
 			tailsize += (cip->ic_trailer + cip->ic_miclen);
+
+			/* add the 8 bytes MIC length */
+			if (cip->ic_cipher == IEEE80211_CIPHER_TKIP)
+				pktlen += IEEE80211_WEP_MICLEN;
 		}
 
 		pdusize = vap->iv_fragthreshold - (hdrsize_nopad + ciphdrsize);
 		fragcnt = *framecnt =
-			((pktlen - (hdrsize_nopad + ciphdrsize)) / pdusize) +
-			(((pktlen - (hdrsize_nopad + ciphdrsize)) %
-				pdusize == 0) ? 0 : 1);
+			((pktlen - hdrsize_nopad) / pdusize) +
+			(((pktlen - hdrsize_nopad) % pdusize == 0) ? 0 : 1);
 
 		/*
 		 * Allocate sk_buff for each subsequent fragment; First fragment
--- a/net80211/ieee80211_node.c
+++ b/net80211/ieee80211_node.c
@@ -2264,11 +2264,13 @@
 	/* From this point onwards we can no longer find the node,
 	 * so no more references are generated
 	 */
-	ieee80211_remove_wds_addr(nt, ni->ni_macaddr);
-	ieee80211_del_wds_node(nt, ni);
-	IEEE80211_NODE_TABLE_LOCK_IRQ(nt);
-	node_table_leave_locked(nt, ni);
-	IEEE80211_NODE_TABLE_UNLOCK_IRQ(nt);
+	if (nt) {
+		ieee80211_remove_wds_addr(nt, ni->ni_macaddr);
+		ieee80211_del_wds_node(nt, ni);
+		IEEE80211_NODE_TABLE_LOCK_IRQ(nt);
+		node_table_leave_locked(nt, ni);
+		IEEE80211_NODE_TABLE_UNLOCK_IRQ(nt);
+	}
 
 	/*
 	 * If node wasn't previously associated all