[PATCH] mac80211: fix TKIP IV update
The TKIP IV should be updated only after MMIC verification,
this patch changes it to be at that spot.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 636de70..32d19bb 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -153,6 +153,8 @@
int sent_ps_buffered;
int queue;
int load;
+ u32 tkip_iv32;
+ u16 tkip_iv16;
} rx;
} u;
};
diff --git a/net/mac80211/tkip.c b/net/mac80211/tkip.c
index 5b11f14..3abe194 100644
--- a/net/mac80211/tkip.c
+++ b/net/mac80211/tkip.c
@@ -238,7 +238,8 @@
int ieee80211_tkip_decrypt_data(struct crypto_blkcipher *tfm,
struct ieee80211_key *key,
u8 *payload, size_t payload_len, u8 *ta,
- int only_iv, int queue)
+ int only_iv, int queue,
+ u32 *out_iv32, u16 *out_iv16)
{
u32 iv32;
u32 iv16;
@@ -332,11 +333,14 @@
res = ieee80211_wep_decrypt_data(tfm, rc4key, 16, pos, payload_len - 12);
done:
if (res == TKIP_DECRYPT_OK) {
- /* FIX: these should be updated only after Michael MIC has been
- * verified */
- /* Record previously received IV */
- key->u.tkip.iv32_rx[queue] = iv32;
- key->u.tkip.iv16_rx[queue] = iv16;
+ /*
+ * Record previously received IV, will be copied into the
+ * key information after MIC verification. It is possible
+ * that we don't catch replays of fragments but that's ok
+ * because the Michael MIC verication will then fail.
+ */
+ *out_iv32 = iv32;
+ *out_iv16 = iv16;
}
return res;
diff --git a/net/mac80211/tkip.h b/net/mac80211/tkip.h
index a0d181a..73d8ef2 100644
--- a/net/mac80211/tkip.h
+++ b/net/mac80211/tkip.h
@@ -31,6 +31,7 @@
int ieee80211_tkip_decrypt_data(struct crypto_blkcipher *tfm,
struct ieee80211_key *key,
u8 *payload, size_t payload_len, u8 *ta,
- int only_iv, int queue);
+ int only_iv, int queue,
+ u32 *out_iv32, u16 *out_iv16);
#endif /* TKIP_H */
diff --git a/net/mac80211/wpa.c b/net/mac80211/wpa.c
index a07fd748..6695efb 100644
--- a/net/mac80211/wpa.c
+++ b/net/mac80211/wpa.c
@@ -175,6 +175,10 @@
/* remove Michael MIC from payload */
skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
+ /* update IV in key information to be able to detect replays */
+ rx->key->u.tkip.iv32_rx[rx->u.rx.queue] = rx->u.rx.tkip_iv32;
+ rx->key->u.tkip.iv16_rx[rx->u.rx.queue] = rx->u.rx.tkip_iv16;
+
return TXRX_CONTINUE;
}
@@ -315,7 +319,9 @@
res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
key, skb->data + hdrlen,
skb->len - hdrlen, rx->sta->addr,
- hwaccel, rx->u.rx.queue);
+ hwaccel, rx->u.rx.queue,
+ &rx->u.rx.tkip_iv32,
+ &rx->u.rx.tkip_iv16);
if (res != TKIP_DECRYPT_OK || wpa_test) {
printk(KERN_DEBUG "%s: TKIP decrypt failed for RX frame from "
"%s (res=%d)\n",