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ath9k: move RX check code into helper ath9k_rx_accept() 

This does sanity checking on the skb and RX status descriptor
prior to processing.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Luis R. Rodriguez 2009-11-03 17:39:00 -08:00 committed by John W. Linville
parent 712c13a86a
commit 207e96854e
1 changed files with 64 additions and 45 deletions
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109
drivers/net/wireless/ath/ath9k/recv.c
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@ -86,6 +86,68 @@ static void ath_setdefantenna(struct ath_softc *sc, u32 antenna)
sc->rx.rxotherant = 0; sc->rx.rxotherant = 0;
} }
/* Assumes you've already done the endian to CPU conversion */
static bool ath9k_rx_accept(struct ath_common *common,
struct sk_buff *skb,
struct ieee80211_rx_status *rxs,
struct ath_rx_status *rx_stats,
bool *decrypt_error)
{
struct ath_hw *ah = common->ah;
struct ieee80211_hdr *hdr;
__le16 fc;
hdr = (struct ieee80211_hdr *) skb->data;
fc = hdr->frame_control;
if (rx_stats->rs_more) {
/*
* Frame spans multiple descriptors; this cannot happen yet
* as we don't support jumbograms. If not in monitor mode,
* discard the frame. Enable this if you want to see
* error frames in Monitor mode.
*/
if (ah->opmode != NL80211_IFTYPE_MONITOR)
return false;
} else if (rx_stats->rs_status != 0) {
if (rx_stats->rs_status & ATH9K_RXERR_CRC)
rxs->flag |= RX_FLAG_FAILED_FCS_CRC;
if (rx_stats->rs_status & ATH9K_RXERR_PHY)
return false;
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
rxs->flag |= RX_FLAG_MMIC_ERROR;
}
/*
* Reject error frames with the exception of
* decryption and MIC failures. For monitor mode,
* we also ignore the CRC error.
*/
if (ah->opmode == NL80211_IFTYPE_MONITOR) {
if (rx_stats->rs_status &
~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
ATH9K_RXERR_CRC))
return false;
} else {
if (rx_stats->rs_status &
~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) {
return false;
}
}
}
return true;
}
/* /*
* For Decrypt or Demic errors, we only mark packet status here and always push * For Decrypt or Demic errors, we only mark packet status here and always push
* up the frame up to let mac80211 handle the actual error case, be it no * up the frame up to let mac80211 handle the actual error case, be it no
@ -109,51 +171,8 @@ static int ath_rx_prepare(struct ath_common *common,
fc = hdr->frame_control; fc = hdr->frame_control;
memset(rx_status, 0, sizeof(struct ieee80211_rx_status)); memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
if (rx_stats->rs_more) { if (!ath9k_rx_accept(common, skb, rx_status, rx_stats, decrypt_error))
/* goto rx_next;
* Frame spans multiple descriptors; this cannot happen yet
* as we don't support jumbograms. If not in monitor mode,
* discard the frame. Enable this if you want to see
* error frames in Monitor mode.
*/
if (ah->opmode != NL80211_IFTYPE_MONITOR)
goto rx_next;
} else if (rx_stats->rs_status != 0) {
if (rx_stats->rs_status & ATH9K_RXERR_CRC)
rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
if (rx_stats->rs_status & ATH9K_RXERR_PHY)
goto rx_next;
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
rx_status->flag |= RX_FLAG_MMIC_ERROR;
}
/*
* Reject error frames with the exception of
* decryption and MIC failures. For monitor mode,
* we also ignore the CRC error.
*/
if (ah->opmode == NL80211_IFTYPE_MONITOR) {
if (rx_stats->rs_status &
~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
ATH9K_RXERR_CRC))
goto rx_next;
} else {
if (rx_stats->rs_status &
~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) {
goto rx_next;
}
}
}
ratecode = rx_stats->rs_rate; ratecode = rx_stats->rs_rate;