[PATCH v2] ath10k: rebuild crypto header in Rx data frames
Sebastian Gottschall
s.gottschall at dd-wrt.com
Tue Oct 24 12:27:47 PDT 2017
will test it and report success (or not)
Am 24.10.2017 um 19:54 schrieb Kalle Valo:
> From: Vasanthakumar Thiagarajan <vthiagar at qti.qualcomm.com>
>
> Rx data frames notified through HTT_T2H_MSG_TYPE_RX_IND and
> HTT_T2H_MSG_TYPE_RX_FRAG_IND expect PN/TSC check to be done
> on host (mac80211) rather than firmware. Rebuild cipher header
> in every received data frames (that are notified through those
> HTT interfaces) from the rx_hdr_status tlv available in the
> rx descriptor of the first msdu. Skip setting RX_FLAG_IV_STRIPPED
> flag for the packets which requires mac80211 PN/TSC check support
> and set appropriate RX_FLAG for stripped crypto tail. Hw QCA988X,
> QCA9887, QCA99X0, QCA9984, QCA9888 and QCA4019 currently need the
> rebuilding of cipher header to perform PN/TSC check for replay
> attack.
>
> Tested-by: Manikanta Pubbisetty <mpubbise at qti.qualcomm.com>
> Signed-off-by: Vasanthakumar Thiagarajan <vthiagar at qti.qualcomm.com>
> Signed-off-by: Kalle Valo <kvalo at qca.qualcomm.com>
> ---
>
> v2:
>
> * Construct cipher header from rx_hdr_status tlv rather than from
> the msdu_start and mpdu_start tlvs. This fixes connection
> issues, also reduces the amount of code change.
>
> * Make sure the frame is qos data before clearing AMSDU_PRESENT
> bit of qos control field.
>
> * Fix traffic issue with QCA988X and QCA9887 hw by taking care of
> padding bytes added for 4-byte alignment before the cipher
> header.
>
> TODO:
>
> * CCMP-256 and GCMP/GCMP-256 are not yet supported
>
> drivers/net/wireless/ath/ath10k/htt_rx.c | 91 ++++++++++++++++++++++++++------
> 1 file changed, 74 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/net/wireless/ath/ath10k/htt_rx.c b/drivers/net/wireless/ath/ath10k/htt_rx.c
> index a3f5dc78353f..aae4f0ea9360 100644
> --- a/drivers/net/wireless/ath/ath10k/htt_rx.c
> +++ b/drivers/net/wireless/ath/ath10k/htt_rx.c
> @@ -1050,8 +1050,14 @@ static void ath10k_htt_rx_h_undecap_raw(struct ath10k *ar,
>
> hdr = (void *)msdu->data;
>
> - /* Tail */
> - if (status->flag & RX_FLAG_IV_STRIPPED)
> + /* MIC */
> + if ((status->flag & RX_FLAG_MIC_STRIPPED) &&
> + enctype == HTT_RX_MPDU_ENCRYPT_AES_CCM_WPA2)
> + skb_trim(msdu, msdu->len - 8);
> +
> + /* ICV */
> + if (status->flag & RX_FLAG_ICV_STRIPPED &&
> + enctype != HTT_RX_MPDU_ENCRYPT_AES_CCM_WPA2)
> skb_trim(msdu, msdu->len -
> ath10k_htt_rx_crypto_tail_len(ar, enctype));
>
> @@ -1075,7 +1081,8 @@ static void ath10k_htt_rx_h_undecap_raw(struct ath10k *ar,
> static void ath10k_htt_rx_h_undecap_nwifi(struct ath10k *ar,
> struct sk_buff *msdu,
> struct ieee80211_rx_status *status,
> - const u8 first_hdr[64])
> + const u8 first_hdr[64],
> + enum htt_rx_mpdu_encrypt_type enctype)
> {
> struct ieee80211_hdr *hdr;
> struct htt_rx_desc *rxd;
> @@ -1083,6 +1090,7 @@ static void ath10k_htt_rx_h_undecap_nwifi(struct ath10k *ar,
> u8 da[ETH_ALEN];
> u8 sa[ETH_ALEN];
> int l3_pad_bytes;
> + int bytes_aligned = ar->hw_params.decap_align_bytes;
>
> /* Delivered decapped frame:
> * [nwifi 802.11 header] <-- replaced with 802.11 hdr
> @@ -1111,6 +1119,14 @@ static void ath10k_htt_rx_h_undecap_nwifi(struct ath10k *ar,
> /* push original 802.11 header */
> hdr = (struct ieee80211_hdr *)first_hdr;
> hdr_len = ieee80211_hdrlen(hdr->frame_control);
> +
> + if (!(status->flag & RX_FLAG_IV_STRIPPED)) {
> + memcpy(skb_push(msdu,
> + ath10k_htt_rx_crypto_param_len(ar, enctype)),
> + (void *)hdr + round_up(hdr_len, bytes_aligned),
> + ath10k_htt_rx_crypto_param_len(ar, enctype));
> + }
> +
> memcpy(skb_push(msdu, hdr_len), hdr, hdr_len);
>
> /* original 802.11 header has a different DA and in
> @@ -1171,6 +1187,7 @@ static void ath10k_htt_rx_h_undecap_eth(struct ath10k *ar,
> u8 sa[ETH_ALEN];
> int l3_pad_bytes;
> struct htt_rx_desc *rxd;
> + int bytes_aligned = ar->hw_params.decap_align_bytes;
>
> /* Delivered decapped frame:
> * [eth header] <-- replaced with 802.11 hdr & rfc1042/llc
> @@ -1199,6 +1216,14 @@ static void ath10k_htt_rx_h_undecap_eth(struct ath10k *ar,
> /* push original 802.11 header */
> hdr = (struct ieee80211_hdr *)first_hdr;
> hdr_len = ieee80211_hdrlen(hdr->frame_control);
> +
> + if (!(status->flag & RX_FLAG_IV_STRIPPED)) {
> + memcpy(skb_push(msdu,
> + ath10k_htt_rx_crypto_param_len(ar, enctype)),
> + (void *)hdr + round_up(hdr_len, bytes_aligned),
> + ath10k_htt_rx_crypto_param_len(ar, enctype));
> + }
> +
> memcpy(skb_push(msdu, hdr_len), hdr, hdr_len);
>
> /* original 802.11 header has a different DA and in
> @@ -1212,12 +1237,14 @@ static void ath10k_htt_rx_h_undecap_eth(struct ath10k *ar,
> static void ath10k_htt_rx_h_undecap_snap(struct ath10k *ar,
> struct sk_buff *msdu,
> struct ieee80211_rx_status *status,
> - const u8 first_hdr[64])
> + const u8 first_hdr[64],
> + enum htt_rx_mpdu_encrypt_type enctype)
> {
> struct ieee80211_hdr *hdr;
> size_t hdr_len;
> int l3_pad_bytes;
> struct htt_rx_desc *rxd;
> + int bytes_aligned = ar->hw_params.decap_align_bytes;
>
> /* Delivered decapped frame:
> * [amsdu header] <-- replaced with 802.11 hdr
> @@ -1233,6 +1260,14 @@ static void ath10k_htt_rx_h_undecap_snap(struct ath10k *ar,
>
> hdr = (struct ieee80211_hdr *)first_hdr;
> hdr_len = ieee80211_hdrlen(hdr->frame_control);
> +
> + if (!(status->flag & RX_FLAG_IV_STRIPPED)) {
> + memcpy(skb_push(msdu,
> + ath10k_htt_rx_crypto_param_len(ar, enctype)),
> + (void *)hdr + round_up(hdr_len, bytes_aligned),
> + ath10k_htt_rx_crypto_param_len(ar, enctype));
> + }
> +
> memcpy(skb_push(msdu, hdr_len), hdr, hdr_len);
> }
>
> @@ -1267,13 +1302,15 @@ static void ath10k_htt_rx_h_undecap(struct ath10k *ar,
> is_decrypted);
> break;
> case RX_MSDU_DECAP_NATIVE_WIFI:
> - ath10k_htt_rx_h_undecap_nwifi(ar, msdu, status, first_hdr);
> + ath10k_htt_rx_h_undecap_nwifi(ar, msdu, status, first_hdr,
> + enctype);
> break;
> case RX_MSDU_DECAP_ETHERNET2_DIX:
> ath10k_htt_rx_h_undecap_eth(ar, msdu, status, first_hdr, enctype);
> break;
> case RX_MSDU_DECAP_8023_SNAP_LLC:
> - ath10k_htt_rx_h_undecap_snap(ar, msdu, status, first_hdr);
> + ath10k_htt_rx_h_undecap_snap(ar, msdu, status, first_hdr,
> + enctype);
> break;
> }
> }
> @@ -1316,7 +1353,8 @@ static void ath10k_htt_rx_h_csum_offload(struct sk_buff *msdu)
>
> static void ath10k_htt_rx_h_mpdu(struct ath10k *ar,
> struct sk_buff_head *amsdu,
> - struct ieee80211_rx_status *status)
> + struct ieee80211_rx_status *status,
> + bool fill_crypt_header)
> {
> struct sk_buff *first;
> struct sk_buff *last;
> @@ -1326,7 +1364,6 @@ static void ath10k_htt_rx_h_mpdu(struct ath10k *ar,
> enum htt_rx_mpdu_encrypt_type enctype;
> u8 first_hdr[64];
> u8 *qos;
> - size_t hdr_len;
> bool has_fcs_err;
> bool has_crypto_err;
> bool has_tkip_err;
> @@ -1351,15 +1388,17 @@ static void ath10k_htt_rx_h_mpdu(struct ath10k *ar,
> * decapped header. It'll be used for undecapping of each MSDU.
> */
> hdr = (void *)rxd->rx_hdr_status;
> - hdr_len = ieee80211_hdrlen(hdr->frame_control);
> - memcpy(first_hdr, hdr, hdr_len);
> + memcpy(first_hdr, hdr, RX_HTT_HDR_STATUS_LEN);
>
> /* Each A-MSDU subframe will use the original header as the base and be
> * reported as a separate MSDU so strip the A-MSDU bit from QoS Ctl.
> */
> hdr = (void *)first_hdr;
> - qos = ieee80211_get_qos_ctl(hdr);
> - qos[0] &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
> +
> + if (ieee80211_is_data_qos(hdr->frame_control)) {
> + qos = ieee80211_get_qos_ctl(hdr);
> + qos[0] &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
> + }
>
> /* Some attention flags are valid only in the last MSDU. */
> last = skb_peek_tail(amsdu);
> @@ -1406,9 +1445,14 @@ static void ath10k_htt_rx_h_mpdu(struct ath10k *ar,
> status->flag |= RX_FLAG_DECRYPTED;
>
> if (likely(!is_mgmt))
> - status->flag |= RX_FLAG_IV_STRIPPED |
> - RX_FLAG_MMIC_STRIPPED;
> -}
> + status->flag |= RX_FLAG_MMIC_STRIPPED;
> +
> + if (fill_crypt_header)
> + status->flag |= RX_FLAG_MIC_STRIPPED |
> + RX_FLAG_ICV_STRIPPED;
> + else
> + status->flag |= RX_FLAG_IV_STRIPPED;
> + }
>
> skb_queue_walk(amsdu, msdu) {
> ath10k_htt_rx_h_csum_offload(msdu);
> @@ -1424,6 +1468,9 @@ static void ath10k_htt_rx_h_mpdu(struct ath10k *ar,
> if (is_mgmt)
> continue;
>
> + if (fill_crypt_header)
> + continue;
> +
> hdr = (void *)msdu->data;
> hdr->frame_control &= ~__cpu_to_le16(IEEE80211_FCTL_PROTECTED);
> }
> @@ -1434,6 +1481,9 @@ static void ath10k_htt_rx_h_deliver(struct ath10k *ar,
> struct ieee80211_rx_status *status)
> {
> struct sk_buff *msdu;
> + struct sk_buff *first_subframe;
> +
> + first_subframe = skb_peek(amsdu);
>
> while ((msdu = __skb_dequeue(amsdu))) {
> /* Setup per-MSDU flags */
> @@ -1442,6 +1492,13 @@ static void ath10k_htt_rx_h_deliver(struct ath10k *ar,
> else
> status->flag |= RX_FLAG_AMSDU_MORE;
>
> + if (msdu == first_subframe) {
> + first_subframe = NULL;
> + status->flag &= ~RX_FLAG_ALLOW_SAME_PN;
> + } else {
> + status->flag |= RX_FLAG_ALLOW_SAME_PN;
> + }
> +
> ath10k_process_rx(ar, status, msdu);
> }
> }
> @@ -1584,7 +1641,7 @@ static int ath10k_htt_rx_handle_amsdu(struct ath10k_htt *htt)
> ath10k_htt_rx_h_unchain(ar, &amsdu);
>
> ath10k_htt_rx_h_filter(ar, &amsdu, rx_status);
> - ath10k_htt_rx_h_mpdu(ar, &amsdu, rx_status);
> + ath10k_htt_rx_h_mpdu(ar, &amsdu, rx_status, true);
> ath10k_htt_rx_h_deliver(ar, &amsdu, rx_status);
>
> return num_msdus;
> @@ -1923,7 +1980,7 @@ static int ath10k_htt_rx_in_ord_ind(struct ath10k *ar, struct sk_buff *skb,
> budget_left -= skb_queue_len(&amsdu);
> ath10k_htt_rx_h_ppdu(ar, &amsdu, status, vdev_id);
> ath10k_htt_rx_h_filter(ar, &amsdu, status);
> - ath10k_htt_rx_h_mpdu(ar, &amsdu, status);
> + ath10k_htt_rx_h_mpdu(ar, &amsdu, status, false);
> ath10k_htt_rx_h_deliver(ar, &amsdu, status);
> break;
> case -EAGAIN:
--
Mit freundlichen Grüssen / Regards
Sebastian Gottschall / CTO
NewMedia-NET GmbH - DD-WRT
Firmensitz: Stubenwaldallee 21a, 64625 Bensheim
Registergericht: Amtsgericht Darmstadt, HRB 25473
Geschäftsführer: Peter Steinhäuser, Christian Scheele
http://www.dd-wrt.com
email: s.gottschall at dd-wrt.com
Tel.: +496251-582650 / Fax: +496251-5826565
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