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ath9k: add more fixes for TKIP MIC validation

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SVN-Revision: 27564
This commit is contained in:
Felix Fietkau 2011-07-09 03:33:59 +00:00
parent b4cef327ff
commit 891a96d588
1 changed files with 39 additions and 30 deletions
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69
package/mac80211/patches/550-ath9k_mmic_verify.patch
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@ -1,6 +1,6 @@
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -814,16 +814,17 @@ static bool ath9k_rx_accept(struct ath_c
@@ -814,16 +814,19 @@ static bool ath9k_rx_accept(struct ath_c
struct ath_rx_status *rx_stats,
bool *decrypt_error)
{
@ -8,7 +8,7 @@
- (rx_stats->rs_keyix != ATH9K_RXKEYIX_INVALID && \
- test_bit(rx_stats->rs_keyix, common->tkip_keymap))))
-
+ bool is_mc, is_valid_tkip, mic_error = false;
+ bool is_mc, is_valid_tkip, strip_mic, mic_error = false;
struct ath_hw *ah = common->ah;
__le16 fc;
u8 rx_status_len = ah->caps.rx_status_len;
@ -18,37 +18,40 @@
+ is_mc = !!is_multicast_ether_addr(hdr->addr1);
+ is_valid_tkip = rx_stats->rs_keyix != ATH9K_RXKEYIX_INVALID &&
+ test_bit(rx_stats->rs_keyix, common->tkip_keymap);
+ strip_mic = is_valid_tkip && !(rx_stats->rs_status &
+ (ATH9K_RXERR_DECRYPT | ATH9K_RXERR_CRC | ATH9K_RXERR_MIC));
+
if (!rx_stats->rs_datalen)
return false;
/*
@@ -853,19 +854,19 @@ static bool ath9k_rx_accept(struct ath_c
if (rx_stats->rs_status & ATH9K_RXERR_DECRYPT) {
@@ -850,25 +853,9 @@ static bool ath9k_rx_accept(struct ath_c
if (rx_stats->rs_status & ATH9K_RXERR_PHY)
return false;
- if (rx_stats->rs_status & ATH9K_RXERR_DECRYPT) {
+ if (rx_stats->rs_status & ATH9K_RXERR_DECRYPT)
*decrypt_error = true;
} else if (rx_stats->rs_status & ATH9K_RXERR_MIC) {
- } else if (rx_stats->rs_status & ATH9K_RXERR_MIC) {
- bool is_mc;
/*
* The MIC error bit is only valid if the frame
* is not a control frame or fragment, and it was
- /*
- * The MIC error bit is only valid if the frame
- * is not a control frame or fragment, and it was
- * decrypted using a valid TKIP key.
+ * decrypted using a valid TKIP key. For multicast
+ * frames the hardware will not return a valid
+ * key index, so accept the MIC bit for those
+ * as well.
*/
- */
- is_mc = !!is_multicast_ether_addr(hdr->addr1);
-
if (!ieee80211_is_ctl(fc) &&
!ieee80211_has_morefrags(fc) &&
!(le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG) &&
- if (!ieee80211_is_ctl(fc) &&
- !ieee80211_has_morefrags(fc) &&
- !(le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG) &&
- is_mc_or_valid_tkip_keyix)
- rxs->flag |= RX_FLAG_MMIC_ERROR;
+ (is_mc || is_valid_tkip))
+ mic_error = true;
else
rx_stats->rs_status &= ~ATH9K_RXERR_MIC;
}
@@ -886,6 +887,22 @@ static bool ath9k_rx_accept(struct ath_c
- else
- rx_stats->rs_status &= ~ATH9K_RXERR_MIC;
- }
/*
* Reject error frames with the exception of
* decryption and MIC failures. For monitor mode,
@@ -886,6 +873,18 @@ static bool ath9k_rx_accept(struct ath_c
}
}
}
@ -59,15 +62,21 @@
+ * False negatives are not common, so skip software verification
+ * if the hardware considers the MIC valid.
+ */
+ if (is_valid_tkip && ieee80211_is_data_present(hdr->frame_control) &&
+ !(rx_stats->rs_status & (ATH9K_RXERR_DECRYPT | ATH9K_RXERR_CRC |
+ ATH9K_RXERR_MIC))) {
+ /* Strip the Michael MIC */
+ rx_stats->rs_datalen -= 8;
+ if (strip_mic)
+ rxs->flag |= RX_FLAG_MMIC_STRIPPED;
+ } else if (is_mc && mic_error) {
+ else if (is_mc && mic_error)
+ rxs->flag |= RX_FLAG_MMIC_ERROR;
+ }
+
return true;
}
@@ -1882,6 +1881,9 @@ int ath_rx_tasklet(struct ath_softc *sc,
ath9k_rx_skb_postprocess(common, hdr_skb, &rs,
rxs, decrypt_error);
+ if (rxs->flag & RX_FLAG_MMIC_STRIPPED)
+ skb_trim(skb, skb->len - 8);
+
/* We will now give hardware our shiny new allocated skb */
bf->bf_mpdu = requeue_skb;
bf->bf_buf_addr = dma_map_single(sc->dev, requeue_skb->data,