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ath9k: fix spurious MIC failure detection, causing instability issues in AP mode

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@22795 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nbd 2010-08-25 12:30:50 +00:00
parent 25d98b3bff
commit bfbae0bd17
1 changed files with 74 additions and 0 deletions
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74
package/mac80211/patches/570-ath9k_mic_failure_fix.patch Normal file
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@ -0,0 +1,74 @@
--- a/drivers/net/wireless/ath/ath.h
+++ b/drivers/net/wireless/ath/ath.h
@@ -119,6 +119,7 @@ struct ath_common {
u32 keymax;
DECLARE_BITMAP(keymap, ATH_KEYMAX);
+ DECLARE_BITMAP(tkip_keymap, ATH_KEYMAX);
u8 splitmic;
struct ath_regulatory regulatory;
--- a/drivers/net/wireless/ath/ath9k/common.c
+++ b/drivers/net/wireless/ath/ath9k/common.c
@@ -366,9 +366,13 @@ int ath9k_cmn_key_config(struct ath_comm
set_bit(idx, common->keymap);
if (key->alg == ALG_TKIP) {
set_bit(idx + 64, common->keymap);
+ set_bit(idx, common->tkip_keymap);
+ set_bit(idx + 64, common->tkip_keymap);
if (common->splitmic) {
set_bit(idx + 32, common->keymap);
set_bit(idx + 64 + 32, common->keymap);
+ set_bit(idx + 32, common->tkip_keymap);
+ set_bit(idx + 64 + 32, common->tkip_keymap);
}
}
@@ -393,10 +397,17 @@ void ath9k_cmn_key_delete(struct ath_com
return;
clear_bit(key->hw_key_idx + 64, common->keymap);
+
+ clear_bit(key->hw_key_idx, common->tkip_keymap);
+ clear_bit(key->hw_key_idx + 64, common->tkip_keymap);
+
if (common->splitmic) {
ath9k_hw_keyreset(ah, key->hw_key_idx + 32);
clear_bit(key->hw_key_idx + 32, common->keymap);
clear_bit(key->hw_key_idx + 64 + 32, common->keymap);
+
+ clear_bit(key->hw_key_idx + 32, common->tkip_keymap);
+ clear_bit(key->hw_key_idx + 64 + 32, common->tkip_keymap);
}
}
EXPORT_SYMBOL(ath9k_cmn_key_delete);
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -870,15 +870,19 @@ static bool ath9k_rx_accept(struct ath_c
if (rx_stats->rs_status & ATH9K_RXERR_DECRYPT) {
*decrypt_error = true;
} else if (rx_stats->rs_status & ATH9K_RXERR_MIC) {
- if (ieee80211_is_ctl(fc))
- /*
- * Sometimes, we get invalid
- * MIC failures on valid control frames.
- * Remove these mic errors.
- */
- rx_stats->rs_status &= ~ATH9K_RXERR_MIC;
- else
+ /*
+ * The MIC error bit is only valid if the frame
+ * is not a control frame, and it was decrypted using
+ * a TKIP key.
+ */
+ if (!ieee80211_is_ctl(fc) &&
+ rx_stats->rs_keyix != ATH9K_RXKEYIX_INVALID &&
+ test_bit(rx_stats->rs_keyix, common->tkip_keymap)) {
rxs->flag |= RX_FLAG_MMIC_ERROR;
+ } else {
+ rx_stats->rs_status &= ~ATH9K_RXERR_MIC;
+ *decrypt_error = true;
+ }
}
/*
* Reject error frames with the exception of