diff options
author | Felix Fietkau <nbd@openwrt.org> | 2010-08-28 16:21:21 (GMT) |
---|---|---|
committer | John W. Linville <linville@tuxdriver.com> | 2010-08-31 18:22:23 (GMT) |
commit | 56363ddeeed3afc5277ca227209773bc1042cc7b (patch) | |
tree | 2f92621e743983cb10175bbbd009ae2e167d1054 /drivers | |
parent | 3653910714a4a9b19aadb202c24f7b1ae61d3556 (diff) | |
download | linux-fsl-qoriq-56363ddeeed3afc5277ca227209773bc1042cc7b.tar.xz |
ath9k: fix spurious MIC failure reports
According to the hardware documentation, the MIC failure bit is only
valid if the frame was decrypted using a valid TKIP key and is not a
fragment.
In some setups I've seen hardware-reported MIC failures on an AP that
was configured for CCMP only, so it's clear that additional checks are
necessary.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Cc: stable@kernel.org
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/net/wireless/ath/ath.h | 1 | ||||
-rw-r--r-- | drivers/net/wireless/ath/ath9k/common.c | 11 | ||||
-rw-r--r-- | drivers/net/wireless/ath/ath9k/mac.c | 3 | ||||
-rw-r--r-- | drivers/net/wireless/ath/ath9k/recv.c | 19 |
4 files changed, 25 insertions, 9 deletions
diff --git a/drivers/net/wireless/ath/ath.h b/drivers/net/wireless/ath/ath.h index d32f282..a706202 100644 --- 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; diff --git a/drivers/net/wireless/ath/ath9k/common.c b/drivers/net/wireless/ath/ath9k/common.c index 31cfe46..2dab64b 100644 --- a/drivers/net/wireless/ath/ath9k/common.c +++ b/drivers/net/wireless/ath/ath9k/common.c @@ -372,9 +372,13 @@ int ath9k_cmn_key_config(struct ath_common *common, set_bit(idx, common->keymap); if (key->cipher == WLAN_CIPHER_SUITE_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); } } @@ -399,10 +403,17 @@ void ath9k_cmn_key_delete(struct ath_common *common, 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); diff --git a/drivers/net/wireless/ath/ath9k/mac.c b/drivers/net/wireless/ath/ath9k/mac.c index e955bb9..0b7d125 100644 --- a/drivers/net/wireless/ath/ath9k/mac.c +++ b/drivers/net/wireless/ath/ath9k/mac.c @@ -711,7 +711,8 @@ int ath9k_hw_rxprocdesc(struct ath_hw *ah, struct ath_desc *ds, rs->rs_phyerr = phyerr; } else if (ads.ds_rxstatus8 & AR_DecryptCRCErr) rs->rs_status |= ATH9K_RXERR_DECRYPT; - else if (ads.ds_rxstatus8 & AR_MichaelErr) + else if ((ads.ds_rxstatus8 & AR_MichaelErr) && + rs->rs_keyix != ATH9K_RXKEYIX_INVALID) rs->rs_status |= ATH9K_RXERR_MIC; } diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c index a3fc987..534a91b 100644 --- a/drivers/net/wireless/ath/ath9k/recv.c +++ b/drivers/net/wireless/ath/ath9k/recv.c @@ -870,15 +870,18 @@ static bool ath9k_rx_accept(struct ath_common *common, 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 or fragment, and it was + * decrypted using a valid TKIP key. + */ + if (!ieee80211_is_ctl(fc) && + !ieee80211_has_morefrags(fc) && + !(le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG) && + test_bit(rx_stats->rs_keyix, common->tkip_keymap)) rxs->flag |= RX_FLAG_MMIC_ERROR; + else + rx_stats->rs_status &= ~ATH9K_RXERR_MIC; } /* * Reject error frames with the exception of |