mirror of https://github.com/hak5/openwrt.git
74 lines
2.4 KiB
Diff
74 lines
2.4 KiB
Diff
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--- a/drivers/net/wireless/ath/ath9k/recv.c
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+++ b/drivers/net/wireless/ath/ath9k/recv.c
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@@ -814,16 +814,17 @@ static bool ath9k_rx_accept(struct ath_c
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struct ath_rx_status *rx_stats,
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bool *decrypt_error)
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{
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-#define is_mc_or_valid_tkip_keyix ((is_mc || \
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- (rx_stats->rs_keyix != ATH9K_RXKEYIX_INVALID && \
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- test_bit(rx_stats->rs_keyix, common->tkip_keymap))))
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-
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+ bool is_mc, is_valid_tkip, mic_error = false;
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struct ath_hw *ah = common->ah;
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__le16 fc;
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u8 rx_status_len = ah->caps.rx_status_len;
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fc = hdr->frame_control;
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+ is_mc = !!is_multicast_ether_addr(hdr->addr1);
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+ is_valid_tkip = rx_stats->rs_keyix != ATH9K_RXKEYIX_INVALID &&
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+ test_bit(rx_stats->rs_keyix, common->tkip_keymap);
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+
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if (!rx_stats->rs_datalen)
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return false;
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/*
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@@ -853,19 +854,19 @@ static bool ath9k_rx_accept(struct ath_c
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if (rx_stats->rs_status & ATH9K_RXERR_DECRYPT) {
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*decrypt_error = true;
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} else if (rx_stats->rs_status & ATH9K_RXERR_MIC) {
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- bool is_mc;
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/*
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* The MIC error bit is only valid if the frame
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* is not a control frame or fragment, and it was
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- * decrypted using a valid TKIP key.
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+ * decrypted using a valid TKIP key. For multicast
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+ * frames the hardware will not return a valid
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+ * key index, so accept the MIC bit for those
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+ * as well.
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*/
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- is_mc = !!is_multicast_ether_addr(hdr->addr1);
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-
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if (!ieee80211_is_ctl(fc) &&
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!ieee80211_has_morefrags(fc) &&
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!(le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG) &&
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- is_mc_or_valid_tkip_keyix)
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- rxs->flag |= RX_FLAG_MMIC_ERROR;
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+ (is_mc || is_valid_tkip))
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+ mic_error = true;
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else
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rx_stats->rs_status &= ~ATH9K_RXERR_MIC;
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}
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@@ -886,6 +887,22 @@ static bool ath9k_rx_accept(struct ath_c
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}
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}
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}
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+
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+ /*
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+ * For unicast frames the MIC error bit can have false positives,
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+ * so all MIC error reports need to be validated in software.
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+ * False negatives are not common, so skip software verification
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+ * if the hardware considers the MIC valid.
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+ */
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+ if (is_valid_tkip && ieee80211_is_data_present(hdr->frame_control) &&
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+ !(rx_stats->rs_status & (ATH9K_RXERR_DECRYPT | ATH9K_RXERR_CRC |
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+ ATH9K_RXERR_MIC))) {
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+ /* Strip the Michael MIC */
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+ rx_stats->rs_datalen -= 8;
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+ rxs->flag |= RX_FLAG_MMIC_STRIPPED;
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+ } else if (is_mc && mic_error) {
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+ rxs->flag |= RX_FLAG_MMIC_ERROR;
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+ }
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return true;
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}
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