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

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Index: madwifi-ng-r2568-20070710/ath/if_ath.c
===================================================================
--- madwifi-ng-r2568-20070710.orig/ath/if_ath.c 2007-10-20 20:52:09.000000000 +0200
+++ madwifi-ng-r2568-20070710/ath/if_ath.c 2007-10-20 20:52:09.000000000 +0200
@@ -5633,6 +5633,7 @@
u_int64_t rs_tsf;
u_int processed = 0, early_stop = 0;
u_int rx_limit = dev->quota;
+ u_int mic_fail = 0;
/* Let the 802.11 layer know about the new noise floor */
sc->sc_channoise = ath_hal_get_channel_noise(ah, &(sc->sc_curchan));
@@ -5727,25 +5728,7 @@
}
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 */
- len = rs->rs_datalen;
- 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;
}
/*
* Reject error frames if we have no vaps that
@@ -5810,8 +5793,9 @@
/*
* 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)) {
dev_kfree_skb(skb);
skb = NULL;
goto rx_next;
@@ -5842,6 +5826,27 @@
sc->sc_hwmap[rs->rs_rate].ieeerate,
rs->rs_rssi);
+ /* MIC failure. Drop the packet in any case */
+ 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;
+ }
+
/*
* Locate the node for sender, track state, and then
* pass the (referenced) node up to the 802.11 layer
Index: madwifi-ng-r2568-20070710/net80211/ieee80211_crypto_ccmp.c
===================================================================
--- madwifi-ng-r2568-20070710.orig/net80211/ieee80211_crypto_ccmp.c 2007-10-20 20:52:09.000000000 +0200
+++ madwifi-ng-r2568-20070710/net80211/ieee80211_crypto_ccmp.c 2007-10-20 20:52:09.000000000 +0200
@@ -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;
}
Index: madwifi-ng-r2568-20070710/net80211/ieee80211_crypto.h
===================================================================
--- madwifi-ng-r2568-20070710.orig/net80211/ieee80211_crypto.h 2007-10-20 20:51:36.000000000 +0200
+++ madwifi-ng-r2568-20070710/net80211/ieee80211_crypto.h 2007-10-20 20:52:09.000000000 +0200
@@ -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);
}
/*
Index: madwifi-ng-r2568-20070710/net80211/ieee80211_crypto_none.c
===================================================================
--- madwifi-ng-r2568-20070710.orig/net80211/ieee80211_crypto_none.c 2007-10-20 20:51:36.000000000 +0200
+++ madwifi-ng-r2568-20070710/net80211/ieee80211_crypto_none.c 2007-10-20 20:52:09.000000000 +0200
@@ -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;
Index: madwifi-ng-r2568-20070710/net80211/ieee80211_crypto_tkip.c
===================================================================
--- madwifi-ng-r2568-20070710.orig/net80211/ieee80211_crypto_tkip.c 2007-10-20 20:51:36.000000000 +0200
+++ madwifi-ng-r2568-20070710/net80211/ieee80211_crypto_tkip.c 2007-10-20 20:52:09.000000000 +0200
@@ -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];
Index: madwifi-ng-r2568-20070710/net80211/ieee80211_crypto_wep.c
===================================================================
--- madwifi-ng-r2568-20070710.orig/net80211/ieee80211_crypto_wep.c 2007-10-20 20:51:36.000000000 +0200
+++ madwifi-ng-r2568-20070710/net80211/ieee80211_crypto_wep.c 2007-10-20 20:52:09.000000000 +0200
@@ -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;
}
Index: madwifi-ng-r2568-20070710/net80211/ieee80211_input.c
===================================================================
--- madwifi-ng-r2568-20070710.orig/net80211/ieee80211_input.c 2007-10-20 20:52:09.000000000 +0200
+++ madwifi-ng-r2568-20070710/net80211/ieee80211_input.c 2007-10-20 20:52:29.000000000 +0200
@@ -632,7 +632,7 @@
* 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);
@@ -3772,6 +3772,47 @@
}
#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.
Index: madwifi-ng-r2568-20070710/net80211/ieee80211_proto.h
===================================================================
--- madwifi-ng-r2568-20070710.orig/net80211/ieee80211_proto.h 2007-10-20 20:51:36.000000000 +0200
+++ madwifi-ng-r2568-20070710/net80211/ieee80211_proto.h 2007-10-20 20:52:09.000000000 +0200
@@ -91,6 +91,7 @@
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.
Index: madwifi-ng-r2568-20070710/net80211/ieee80211_linux.c
===================================================================
--- madwifi-ng-r2568-20070710.orig/net80211/ieee80211_linux.c 2007-10-20 20:52:09.000000000 +0200
+++ madwifi-ng-r2568-20070710/net80211/ieee80211_linux.c 2007-10-20 20:52:09.000000000 +0200
@@ -291,8 +291,8 @@
/* TODO: needed parameters: count, keyid, key type, src address, TSC */
snprintf(buf, sizeof(buf), "%s(keyid=%d %scast addr=%s)", tag,
k->wk_keyix,
- IEEE80211_IS_MULTICAST(wh->i_addr1) ? "broad" : "uni",
- ether_sprintf(wh->i_addr1));
+ IEEE80211_IS_MULTICAST(wh->i_addr2) ? "broad" : "uni",
+ ether_sprintf(wh->i_addr2));
memset(&wrqu, 0, sizeof(wrqu));
wrqu.data.length = strlen(buf);
wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
Index: madwifi-ng-r2568-20070710/net80211/ieee80211_output.c
===================================================================
--- madwifi-ng-r2568-20070710.orig/net80211/ieee80211_output.c 2007-10-20 20:51:36.000000000 +0200
+++ madwifi-ng-r2568-20070710/net80211/ieee80211_output.c 2007-10-20 20:52:29.000000000 +0200
@@ -1079,13 +1079,16 @@
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
Index: madwifi-ng-r2568-20070710/net80211/ieee80211_node.c
===================================================================
--- madwifi-ng-r2568-20070710.orig/net80211/ieee80211_node.c 2007-10-20 20:52:09.000000000 +0200
+++ madwifi-ng-r2568-20070710/net80211/ieee80211_node.c 2007-10-20 20:52:09.000000000 +0200
@@ -1891,11 +1891,13 @@
/* 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(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(nt, ni);
+ IEEE80211_NODE_TABLE_UNLOCK_IRQ(nt);
+ }
/*
* If node wasn't previously associated all
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