658 lines
18 KiB
C
658 lines
18 KiB
C
/*
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* Copyright (c) 2009 Atheros Communications Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* Module for common driver code between ath9k and ath9k_htc
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include "common.h"
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MODULE_AUTHOR("Atheros Communications");
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MODULE_DESCRIPTION("Shared library for Atheros wireless 802.11n LAN cards.");
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MODULE_LICENSE("Dual BSD/GPL");
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/* Common RX processing */
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/* Assumes you've already done the endian to CPU conversion */
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static bool ath9k_rx_accept(struct ath_common *common,
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struct sk_buff *skb,
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struct ieee80211_rx_status *rxs,
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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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struct ath_hw *ah = common->ah;
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struct ieee80211_hdr *hdr;
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__le16 fc;
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hdr = (struct ieee80211_hdr *) skb->data;
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fc = hdr->frame_control;
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if (!rx_stats->rs_datalen)
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return false;
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/*
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* rs_status follows rs_datalen so if rs_datalen is too large
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* we can take a hint that hardware corrupted it, so ignore
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* those frames.
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*/
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if (rx_stats->rs_datalen > common->rx_bufsize)
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return false;
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/*
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* rs_more indicates chained descriptors which can be used
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* to link buffers together for a sort of scatter-gather
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* operation.
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* reject the frame, we don't support scatter-gather yet and
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* the frame is probably corrupt anyway
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*/
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if (rx_stats->rs_more)
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return false;
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/*
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* The rx_stats->rs_status will not be set until the end of the
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* chained descriptors so it can be ignored if rs_more is set. The
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* rs_more will be false at the last element of the chained
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* descriptors.
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*/
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if (rx_stats->rs_status != 0) {
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if (rx_stats->rs_status & ATH9K_RXERR_CRC)
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rxs->flag |= RX_FLAG_FAILED_FCS_CRC;
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if (rx_stats->rs_status & ATH9K_RXERR_PHY)
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return false;
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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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if (ieee80211_is_ctl(fc))
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/*
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* Sometimes, we get invalid
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* MIC failures on valid control frames.
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* Remove these mic errors.
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*/
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rx_stats->rs_status &= ~ATH9K_RXERR_MIC;
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else
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rxs->flag |= RX_FLAG_MMIC_ERROR;
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}
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/*
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* Reject error frames with the exception of
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* decryption and MIC failures. For monitor mode,
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* we also ignore the CRC error.
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*/
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if (ah->opmode == NL80211_IFTYPE_MONITOR) {
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if (rx_stats->rs_status &
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~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
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ATH9K_RXERR_CRC))
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return false;
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} else {
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if (rx_stats->rs_status &
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~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) {
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return false;
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}
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}
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}
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return true;
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}
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static int ath9k_process_rate(struct ath_common *common,
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struct ieee80211_hw *hw,
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struct ath_rx_status *rx_stats,
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struct ieee80211_rx_status *rxs,
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struct sk_buff *skb)
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{
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struct ieee80211_supported_band *sband;
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enum ieee80211_band band;
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unsigned int i = 0;
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band = hw->conf.channel->band;
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sband = hw->wiphy->bands[band];
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if (rx_stats->rs_rate & 0x80) {
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/* HT rate */
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rxs->flag |= RX_FLAG_HT;
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if (rx_stats->rs_flags & ATH9K_RX_2040)
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rxs->flag |= RX_FLAG_40MHZ;
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if (rx_stats->rs_flags & ATH9K_RX_GI)
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rxs->flag |= RX_FLAG_SHORT_GI;
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rxs->rate_idx = rx_stats->rs_rate & 0x7f;
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return 0;
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}
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for (i = 0; i < sband->n_bitrates; i++) {
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if (sband->bitrates[i].hw_value == rx_stats->rs_rate) {
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rxs->rate_idx = i;
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return 0;
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}
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if (sband->bitrates[i].hw_value_short == rx_stats->rs_rate) {
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rxs->flag |= RX_FLAG_SHORTPRE;
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rxs->rate_idx = i;
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return 0;
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}
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}
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/*
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* No valid hardware bitrate found -- we should not get here
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* because hardware has already validated this frame as OK.
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*/
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ath_print(common, ATH_DBG_XMIT, "unsupported hw bitrate detected "
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"0x%02x using 1 Mbit\n", rx_stats->rs_rate);
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if ((common->debug_mask & ATH_DBG_XMIT))
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print_hex_dump_bytes("", DUMP_PREFIX_NONE, skb->data, skb->len);
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return -EINVAL;
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}
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static void ath9k_process_rssi(struct ath_common *common,
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struct ieee80211_hw *hw,
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struct sk_buff *skb,
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struct ath_rx_status *rx_stats)
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{
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struct ath_hw *ah = common->ah;
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struct ieee80211_sta *sta;
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struct ieee80211_hdr *hdr;
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struct ath_node *an;
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int last_rssi = ATH_RSSI_DUMMY_MARKER;
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__le16 fc;
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hdr = (struct ieee80211_hdr *)skb->data;
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fc = hdr->frame_control;
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rcu_read_lock();
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/*
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* XXX: use ieee80211_find_sta! This requires quite a bit of work
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* under the current ath9k virtual wiphy implementation as we have
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* no way of tying a vif to wiphy. Typically vifs are attached to
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* at least one sdata of a wiphy on mac80211 but with ath9k virtual
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* wiphy you'd have to iterate over every wiphy and each sdata.
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*/
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sta = ieee80211_find_sta_by_hw(hw, hdr->addr2);
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if (sta) {
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an = (struct ath_node *) sta->drv_priv;
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if (rx_stats->rs_rssi != ATH9K_RSSI_BAD &&
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!rx_stats->rs_moreaggr)
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ATH_RSSI_LPF(an->last_rssi, rx_stats->rs_rssi);
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last_rssi = an->last_rssi;
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}
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rcu_read_unlock();
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if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
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rx_stats->rs_rssi = ATH_EP_RND(last_rssi,
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ATH_RSSI_EP_MULTIPLIER);
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if (rx_stats->rs_rssi < 0)
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rx_stats->rs_rssi = 0;
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/* Update Beacon RSSI, this is used by ANI. */
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if (ieee80211_is_beacon(fc))
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ah->stats.avgbrssi = rx_stats->rs_rssi;
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}
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/*
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* For Decrypt or Demic errors, we only mark packet status here and always push
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* up the frame up to let mac80211 handle the actual error case, be it no
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* decryption key or real decryption error. This let us keep statistics there.
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*/
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int ath9k_cmn_rx_skb_preprocess(struct ath_common *common,
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struct ieee80211_hw *hw,
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struct sk_buff *skb,
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struct ath_rx_status *rx_stats,
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struct ieee80211_rx_status *rx_status,
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bool *decrypt_error)
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{
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struct ath_hw *ah = common->ah;
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memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
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/*
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* everything but the rate is checked here, the rate check is done
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* separately to avoid doing two lookups for a rate for each frame.
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*/
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if (!ath9k_rx_accept(common, skb, rx_status, rx_stats, decrypt_error))
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return -EINVAL;
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ath9k_process_rssi(common, hw, skb, rx_stats);
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if (ath9k_process_rate(common, hw, rx_stats, rx_status, skb))
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return -EINVAL;
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rx_status->mactime = ath9k_hw_extend_tsf(ah, rx_stats->rs_tstamp);
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rx_status->band = hw->conf.channel->band;
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rx_status->freq = hw->conf.channel->center_freq;
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rx_status->signal = ATH_DEFAULT_NOISE_FLOOR + rx_stats->rs_rssi;
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rx_status->antenna = rx_stats->rs_antenna;
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rx_status->flag |= RX_FLAG_TSFT;
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return 0;
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}
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EXPORT_SYMBOL(ath9k_cmn_rx_skb_preprocess);
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void ath9k_cmn_rx_skb_postprocess(struct ath_common *common,
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struct sk_buff *skb,
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struct ath_rx_status *rx_stats,
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struct ieee80211_rx_status *rxs,
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bool decrypt_error)
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{
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struct ath_hw *ah = common->ah;
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struct ieee80211_hdr *hdr;
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int hdrlen, padpos, padsize;
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u8 keyix;
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__le16 fc;
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/* see if any padding is done by the hw and remove it */
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hdr = (struct ieee80211_hdr *) skb->data;
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hdrlen = ieee80211_get_hdrlen_from_skb(skb);
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fc = hdr->frame_control;
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padpos = ath9k_cmn_padpos(hdr->frame_control);
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/* The MAC header is padded to have 32-bit boundary if the
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* packet payload is non-zero. The general calculation for
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* padsize would take into account odd header lengths:
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* padsize = (4 - padpos % 4) % 4; However, since only
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* even-length headers are used, padding can only be 0 or 2
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* bytes and we can optimize this a bit. In addition, we must
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* not try to remove padding from short control frames that do
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* not have payload. */
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padsize = padpos & 3;
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if (padsize && skb->len>=padpos+padsize+FCS_LEN) {
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memmove(skb->data + padsize, skb->data, padpos);
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skb_pull(skb, padsize);
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}
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keyix = rx_stats->rs_keyix;
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if (!(keyix == ATH9K_RXKEYIX_INVALID) && !decrypt_error &&
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ieee80211_has_protected(fc)) {
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rxs->flag |= RX_FLAG_DECRYPTED;
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} else if (ieee80211_has_protected(fc)
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&& !decrypt_error && skb->len >= hdrlen + 4) {
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keyix = skb->data[hdrlen + 3] >> 6;
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if (test_bit(keyix, common->keymap))
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rxs->flag |= RX_FLAG_DECRYPTED;
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}
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if (ah->sw_mgmt_crypto &&
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(rxs->flag & RX_FLAG_DECRYPTED) &&
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ieee80211_is_mgmt(fc))
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/* Use software decrypt for management frames. */
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rxs->flag &= ~RX_FLAG_DECRYPTED;
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}
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EXPORT_SYMBOL(ath9k_cmn_rx_skb_postprocess);
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int ath9k_cmn_padpos(__le16 frame_control)
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{
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int padpos = 24;
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if (ieee80211_has_a4(frame_control)) {
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padpos += ETH_ALEN;
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}
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if (ieee80211_is_data_qos(frame_control)) {
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padpos += IEEE80211_QOS_CTL_LEN;
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}
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return padpos;
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}
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EXPORT_SYMBOL(ath9k_cmn_padpos);
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int ath9k_cmn_get_hw_crypto_keytype(struct sk_buff *skb)
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{
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struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
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if (tx_info->control.hw_key) {
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if (tx_info->control.hw_key->alg == ALG_WEP)
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return ATH9K_KEY_TYPE_WEP;
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else if (tx_info->control.hw_key->alg == ALG_TKIP)
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return ATH9K_KEY_TYPE_TKIP;
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else if (tx_info->control.hw_key->alg == ALG_CCMP)
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return ATH9K_KEY_TYPE_AES;
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}
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return ATH9K_KEY_TYPE_CLEAR;
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}
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EXPORT_SYMBOL(ath9k_cmn_get_hw_crypto_keytype);
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static u32 ath9k_get_extchanmode(struct ieee80211_channel *chan,
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enum nl80211_channel_type channel_type)
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{
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u32 chanmode = 0;
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switch (chan->band) {
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case IEEE80211_BAND_2GHZ:
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switch (channel_type) {
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case NL80211_CHAN_NO_HT:
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case NL80211_CHAN_HT20:
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chanmode = CHANNEL_G_HT20;
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break;
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case NL80211_CHAN_HT40PLUS:
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chanmode = CHANNEL_G_HT40PLUS;
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break;
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case NL80211_CHAN_HT40MINUS:
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chanmode = CHANNEL_G_HT40MINUS;
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break;
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}
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break;
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case IEEE80211_BAND_5GHZ:
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switch (channel_type) {
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case NL80211_CHAN_NO_HT:
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case NL80211_CHAN_HT20:
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chanmode = CHANNEL_A_HT20;
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break;
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case NL80211_CHAN_HT40PLUS:
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chanmode = CHANNEL_A_HT40PLUS;
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break;
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case NL80211_CHAN_HT40MINUS:
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chanmode = CHANNEL_A_HT40MINUS;
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break;
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}
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break;
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default:
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break;
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}
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return chanmode;
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}
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/*
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* Update internal channel flags.
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*/
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void ath9k_cmn_update_ichannel(struct ieee80211_hw *hw,
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struct ath9k_channel *ichan)
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{
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struct ieee80211_channel *chan = hw->conf.channel;
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struct ieee80211_conf *conf = &hw->conf;
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ichan->channel = chan->center_freq;
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ichan->chan = chan;
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if (chan->band == IEEE80211_BAND_2GHZ) {
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ichan->chanmode = CHANNEL_G;
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ichan->channelFlags = CHANNEL_2GHZ | CHANNEL_OFDM | CHANNEL_G;
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} else {
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ichan->chanmode = CHANNEL_A;
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ichan->channelFlags = CHANNEL_5GHZ | CHANNEL_OFDM;
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}
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if (conf_is_ht(conf))
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ichan->chanmode = ath9k_get_extchanmode(chan,
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conf->channel_type);
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}
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EXPORT_SYMBOL(ath9k_cmn_update_ichannel);
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/*
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* Get the internal channel reference.
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*/
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struct ath9k_channel *ath9k_cmn_get_curchannel(struct ieee80211_hw *hw,
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struct ath_hw *ah)
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{
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struct ieee80211_channel *curchan = hw->conf.channel;
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struct ath9k_channel *channel;
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u8 chan_idx;
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chan_idx = curchan->hw_value;
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channel = &ah->channels[chan_idx];
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ath9k_cmn_update_ichannel(hw, channel);
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return channel;
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}
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EXPORT_SYMBOL(ath9k_cmn_get_curchannel);
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static int ath_setkey_tkip(struct ath_common *common, u16 keyix, const u8 *key,
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struct ath9k_keyval *hk, const u8 *addr,
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bool authenticator)
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{
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struct ath_hw *ah = common->ah;
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const u8 *key_rxmic;
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const u8 *key_txmic;
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key_txmic = key + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY;
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key_rxmic = key + NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY;
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if (addr == NULL) {
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/*
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* Group key installation - only two key cache entries are used
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* regardless of splitmic capability since group key is only
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* used either for TX or RX.
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*/
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if (authenticator) {
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memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic));
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memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_mic));
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} else {
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memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
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memcpy(hk->kv_txmic, key_rxmic, sizeof(hk->kv_mic));
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}
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return ath9k_hw_set_keycache_entry(ah, keyix, hk, addr);
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}
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if (!common->splitmic) {
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/* TX and RX keys share the same key cache entry. */
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memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
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memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_txmic));
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return ath9k_hw_set_keycache_entry(ah, keyix, hk, addr);
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}
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/* Separate key cache entries for TX and RX */
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/* TX key goes at first index, RX key at +32. */
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memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic));
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if (!ath9k_hw_set_keycache_entry(ah, keyix, hk, NULL)) {
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/* TX MIC entry failed. No need to proceed further */
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ath_print(common, ATH_DBG_FATAL,
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"Setting TX MIC Key Failed\n");
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return 0;
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}
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memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
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/* XXX delete tx key on failure? */
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return ath9k_hw_set_keycache_entry(ah, keyix + 32, hk, addr);
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}
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static int ath_reserve_key_cache_slot_tkip(struct ath_common *common)
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{
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int i;
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for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) {
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if (test_bit(i, common->keymap) ||
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test_bit(i + 64, common->keymap))
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continue; /* At least one part of TKIP key allocated */
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if (common->splitmic &&
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(test_bit(i + 32, common->keymap) ||
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test_bit(i + 64 + 32, common->keymap)))
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continue; /* At least one part of TKIP key allocated */
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/* Found a free slot for a TKIP key */
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return i;
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}
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return -1;
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}
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static int ath_reserve_key_cache_slot(struct ath_common *common)
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{
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int i;
|
|
|
|
/* First, try to find slots that would not be available for TKIP. */
|
|
if (common->splitmic) {
|
|
for (i = IEEE80211_WEP_NKID; i < common->keymax / 4; i++) {
|
|
if (!test_bit(i, common->keymap) &&
|
|
(test_bit(i + 32, common->keymap) ||
|
|
test_bit(i + 64, common->keymap) ||
|
|
test_bit(i + 64 + 32, common->keymap)))
|
|
return i;
|
|
if (!test_bit(i + 32, common->keymap) &&
|
|
(test_bit(i, common->keymap) ||
|
|
test_bit(i + 64, common->keymap) ||
|
|
test_bit(i + 64 + 32, common->keymap)))
|
|
return i + 32;
|
|
if (!test_bit(i + 64, common->keymap) &&
|
|
(test_bit(i , common->keymap) ||
|
|
test_bit(i + 32, common->keymap) ||
|
|
test_bit(i + 64 + 32, common->keymap)))
|
|
return i + 64;
|
|
if (!test_bit(i + 64 + 32, common->keymap) &&
|
|
(test_bit(i, common->keymap) ||
|
|
test_bit(i + 32, common->keymap) ||
|
|
test_bit(i + 64, common->keymap)))
|
|
return i + 64 + 32;
|
|
}
|
|
} else {
|
|
for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) {
|
|
if (!test_bit(i, common->keymap) &&
|
|
test_bit(i + 64, common->keymap))
|
|
return i;
|
|
if (test_bit(i, common->keymap) &&
|
|
!test_bit(i + 64, common->keymap))
|
|
return i + 64;
|
|
}
|
|
}
|
|
|
|
/* No partially used TKIP slots, pick any available slot */
|
|
for (i = IEEE80211_WEP_NKID; i < common->keymax; i++) {
|
|
/* Do not allow slots that could be needed for TKIP group keys
|
|
* to be used. This limitation could be removed if we know that
|
|
* TKIP will not be used. */
|
|
if (i >= 64 && i < 64 + IEEE80211_WEP_NKID)
|
|
continue;
|
|
if (common->splitmic) {
|
|
if (i >= 32 && i < 32 + IEEE80211_WEP_NKID)
|
|
continue;
|
|
if (i >= 64 + 32 && i < 64 + 32 + IEEE80211_WEP_NKID)
|
|
continue;
|
|
}
|
|
|
|
if (!test_bit(i, common->keymap))
|
|
return i; /* Found a free slot for a key */
|
|
}
|
|
|
|
/* No free slot found */
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Configure encryption in the HW.
|
|
*/
|
|
int ath9k_cmn_key_config(struct ath_common *common,
|
|
struct ieee80211_vif *vif,
|
|
struct ieee80211_sta *sta,
|
|
struct ieee80211_key_conf *key)
|
|
{
|
|
struct ath_hw *ah = common->ah;
|
|
struct ath9k_keyval hk;
|
|
const u8 *mac = NULL;
|
|
int ret = 0;
|
|
int idx;
|
|
|
|
memset(&hk, 0, sizeof(hk));
|
|
|
|
switch (key->alg) {
|
|
case ALG_WEP:
|
|
hk.kv_type = ATH9K_CIPHER_WEP;
|
|
break;
|
|
case ALG_TKIP:
|
|
hk.kv_type = ATH9K_CIPHER_TKIP;
|
|
break;
|
|
case ALG_CCMP:
|
|
hk.kv_type = ATH9K_CIPHER_AES_CCM;
|
|
break;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
hk.kv_len = key->keylen;
|
|
memcpy(hk.kv_val, key->key, key->keylen);
|
|
|
|
if (!(key->flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
|
|
/* For now, use the default keys for broadcast keys. This may
|
|
* need to change with virtual interfaces. */
|
|
idx = key->keyidx;
|
|
} else if (key->keyidx) {
|
|
if (WARN_ON(!sta))
|
|
return -EOPNOTSUPP;
|
|
mac = sta->addr;
|
|
|
|
if (vif->type != NL80211_IFTYPE_AP) {
|
|
/* Only keyidx 0 should be used with unicast key, but
|
|
* allow this for client mode for now. */
|
|
idx = key->keyidx;
|
|
} else
|
|
return -EIO;
|
|
} else {
|
|
if (WARN_ON(!sta))
|
|
return -EOPNOTSUPP;
|
|
mac = sta->addr;
|
|
|
|
if (key->alg == ALG_TKIP)
|
|
idx = ath_reserve_key_cache_slot_tkip(common);
|
|
else
|
|
idx = ath_reserve_key_cache_slot(common);
|
|
if (idx < 0)
|
|
return -ENOSPC; /* no free key cache entries */
|
|
}
|
|
|
|
if (key->alg == ALG_TKIP)
|
|
ret = ath_setkey_tkip(common, idx, key->key, &hk, mac,
|
|
vif->type == NL80211_IFTYPE_AP);
|
|
else
|
|
ret = ath9k_hw_set_keycache_entry(ah, idx, &hk, mac);
|
|
|
|
if (!ret)
|
|
return -EIO;
|
|
|
|
set_bit(idx, common->keymap);
|
|
if (key->alg == ALG_TKIP) {
|
|
set_bit(idx + 64, common->keymap);
|
|
if (common->splitmic) {
|
|
set_bit(idx + 32, common->keymap);
|
|
set_bit(idx + 64 + 32, common->keymap);
|
|
}
|
|
}
|
|
|
|
return idx;
|
|
}
|
|
EXPORT_SYMBOL(ath9k_cmn_key_config);
|
|
|
|
/*
|
|
* Delete Key.
|
|
*/
|
|
void ath9k_cmn_key_delete(struct ath_common *common,
|
|
struct ieee80211_key_conf *key)
|
|
{
|
|
struct ath_hw *ah = common->ah;
|
|
|
|
ath9k_hw_keyreset(ah, key->hw_key_idx);
|
|
if (key->hw_key_idx < IEEE80211_WEP_NKID)
|
|
return;
|
|
|
|
clear_bit(key->hw_key_idx, common->keymap);
|
|
if (key->alg != ALG_TKIP)
|
|
return;
|
|
|
|
clear_bit(key->hw_key_idx + 64, common->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);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(ath9k_cmn_key_delete);
|
|
|
|
static int __init ath9k_cmn_init(void)
|
|
{
|
|
return 0;
|
|
}
|
|
module_init(ath9k_cmn_init);
|
|
|
|
static void __exit ath9k_cmn_exit(void)
|
|
{
|
|
return;
|
|
}
|
|
module_exit(ath9k_cmn_exit);
|