From patchwork Fri Oct 20 20:11:00 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Sebastian Gottschall X-Patchwork-Id: 10020933 X-Patchwork-Delegate: kvalo@adurom.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id B299460224 for ; Fri, 20 Oct 2017 20:11:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A31EC28F60 for ; Fri, 20 Oct 2017 20:11:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 97D1928F61; Fri, 20 Oct 2017 20:11:10 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7458828F64 for ; Fri, 20 Oct 2017 20:11:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753523AbdJTULH (ORCPT ); Fri, 20 Oct 2017 16:11:07 -0400 Received: from smtps.newmedia-net.de ([185.84.6.167]:37055 "EHLO webmail.newmedia-net.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752041AbdJTULF (ORCPT ); Fri, 20 Oct 2017 16:11:05 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=dd-wrt.com; s=mikd; h=Content-Transfer-Encoding:Content-Type:In-Reply-To:MIME-Version:Date:Message-ID:From:References:Cc:To:Subject; bh=dH1J7ON8HKqIj4QwfSRUVMLQa4vSr4C1Ql/zKunJRxc=; b=kCMNlB5tqBTDHUFyWcIF/Cmfy8doTkJHCdCoRTb0vykbpcOhQ7kmgkCL3MOv02JLiASg2VnIGfj/DyPvS7Hm9YnkTyL9OYEIXjzymU91gCodfUGWaQ5ZGt5jYayOM2/Eq5Qcp1OvRm9lXaLQQpW9ZJFaqjP6Td0DTUC/CgHPFk4=; Subject: Re: [PATCH] ath10k: rebuild crypto header in RX data frames To: Kalle Valo , ath10k@lists.infradead.org Cc: linux-wireless@vger.kernel.org References: <150851690590.5158.11970481736247725763.stgit@potku.adurom.net> From: Sebastian Gottschall Message-ID: Date: Fri, 20 Oct 2017 22:11:00 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:56.0) Gecko/20100101 Thunderbird/56.0 MIME-Version: 1.0 In-Reply-To: <150851690590.5158.11970481736247725763.stgit@potku.adurom.net> X-Received: from [2003:72:e4c:1c00:ac4c:f1b:bf48:52e6] by webmail.newmedia-net.de with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.72) (envelope-from ) id 1e5ddH-00083X-83; Fri, 20 Oct 2017 22:11:03 +0200 Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP i suggest the following patch on top of yours. please tell me if my thoughts are correct here. its mainly a guess Am 20.10.2017 um 18:28 schrieb Kalle Valo: > From: Vasanthakumar Thiagarajan > > 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 PN/TSC and key_id information available > from rx descriptor of the first msdu of each mpdu. 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. QCA988X, QCA9887, QCA99X0, QCA9984, QCA9888 and > QCA4019 currently need the rebuilding of cipher header to perform > PN/TSC check for replay attack. > > Signed-off-by: Vasanthakumar Thiagarajan > Signed-off-by: Kalle Valo > --- > drivers/net/wireless/ath/ath10k/htt_rx.c | 120 ++++++++++++++++++++++++++---- > 1 file changed, 104 insertions(+), 16 deletions(-) > > diff --git a/drivers/net/wireless/ath/ath10k/htt_rx.c b/drivers/net/wireless/ath/ath10k/htt_rx.c > index a3f5dc78353f..9a070ad05179 100644 > --- a/drivers/net/wireless/ath/ath10k/htt_rx.c > +++ b/drivers/net/wireless/ath/ath10k/htt_rx.c > @@ -995,8 +995,55 @@ static int ath10k_htt_rx_nwifi_hdrlen(struct ath10k *ar, > return len; > } > > +static void ath10k_htt_rx_build_crypto_hdr(struct ath10k *ar, > + struct sk_buff *msdu, > + struct htt_rx_desc *rxd, > + struct ieee80211_rx_status *status, > + enum htt_rx_mpdu_encrypt_type type) > +{ > + u8 *hdr; > + > + if (!(status->flag & RX_FLAG_DECRYPTED) || > + status->flag & RX_FLAG_IV_STRIPPED) > + return; > + > + switch (type) { > + case HTT_RX_MPDU_ENCRYPT_NONE: > + return; > + case HTT_RX_MPDU_ENCRYPT_WEP40: > + case HTT_RX_MPDU_ENCRYPT_WEP104: > + hdr = skb_push(msdu, IEEE80211_WEP_IV_LEN); > + memcpy(hdr, rxd->mpdu_start.pn, IEEE80211_WEP_IV_LEN - 1); > + hdr[3] = rxd->msdu_end.common.key_id_octet; > + return; > + case HTT_RX_MPDU_ENCRYPT_TKIP_WITHOUT_MIC: > + case HTT_RX_MPDU_ENCRYPT_TKIP_WPA: > + hdr = skb_push(msdu, IEEE80211_TKIP_IV_LEN); > + hdr[0] = rxd->mpdu_start.pn[1]; > + hdr[1] = 0; > + hdr[2] = rxd->mpdu_start.pn[0]; > + hdr[3] = 0x20 | (rxd->msdu_end.common.key_id_octet << 6); > + memcpy(hdr + 4, rxd->mpdu_start.pn + 2, 4); > + return; > + case HTT_RX_MPDU_ENCRYPT_AES_CCM_WPA2: > + hdr = skb_push(msdu, IEEE80211_CCMP_HDR_LEN); > + memcpy(hdr, rxd->mpdu_start.pn, 2); > + hdr[2] = 0; > + hdr[3] = 0x20 | (rxd->msdu_end.common.key_id_octet << 6); > + memcpy(hdr + 4, rxd->mpdu_start.pn + 2, 4); > + return; > + case HTT_RX_MPDU_ENCRYPT_WEP128: > + case HTT_RX_MPDU_ENCRYPT_WAPI: > + return; > + default: > + ath10k_warn(ar, "unsupported encryption type %d\n", type); > + return; > + } > +} > + > static void ath10k_htt_rx_h_undecap_raw(struct ath10k *ar, > struct sk_buff *msdu, > + struct htt_rx_desc *first_rxd, > struct ieee80211_rx_status *status, > enum htt_rx_mpdu_encrypt_type enctype, > bool is_decrypted) > @@ -1050,8 +1097,14 @@ 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 +1128,9 @@ 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]) > + struct htt_rx_desc *first_rxd, > + const u8 first_hdr[64], > + enum htt_rx_mpdu_encrypt_type enctype) > { > struct ieee80211_hdr *hdr; > struct htt_rx_desc *rxd; > @@ -1108,6 +1163,8 @@ static void ath10k_htt_rx_h_undecap_nwifi(struct ath10k *ar, > ether_addr_copy(sa, ieee80211_get_SA(hdr)); > skb_pull(msdu, hdr_len); > > + ath10k_htt_rx_build_crypto_hdr(ar, msdu, first_rxd, status, enctype); > + > /* push original 802.11 header */ > hdr = (struct ieee80211_hdr *)first_hdr; > hdr_len = ieee80211_hdrlen(hdr->frame_control); > @@ -1160,6 +1217,7 @@ static void *ath10k_htt_rx_h_find_rfc1042(struct ath10k *ar, > static void ath10k_htt_rx_h_undecap_eth(struct ath10k *ar, > struct sk_buff *msdu, > struct ieee80211_rx_status *status, > + struct htt_rx_desc *first_rxd, > const u8 first_hdr[64], > enum htt_rx_mpdu_encrypt_type enctype) > { > @@ -1196,6 +1254,8 @@ static void ath10k_htt_rx_h_undecap_eth(struct ath10k *ar, > memcpy(skb_push(msdu, sizeof(struct rfc1042_hdr)), rfc1042, > sizeof(struct rfc1042_hdr)); > > + ath10k_htt_rx_build_crypto_hdr(ar, msdu, first_rxd, status, enctype); > + > /* push original 802.11 header */ > hdr = (struct ieee80211_hdr *)first_hdr; > hdr_len = ieee80211_hdrlen(hdr->frame_control); > @@ -1212,7 +1272,9 @@ 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]) > + struct htt_rx_desc *first_rxd, > + const u8 first_hdr[64], > + enum htt_rx_mpdu_encrypt_type enctype) > { > struct ieee80211_hdr *hdr; > size_t hdr_len; > @@ -1231,6 +1293,8 @@ static void ath10k_htt_rx_h_undecap_snap(struct ath10k *ar, > skb_put(msdu, l3_pad_bytes); > skb_pull(msdu, sizeof(struct amsdu_subframe_hdr) + l3_pad_bytes); > > + ath10k_htt_rx_build_crypto_hdr(ar, msdu, first_rxd, status, enctype); > + > hdr = (struct ieee80211_hdr *)first_hdr; > hdr_len = ieee80211_hdrlen(hdr->frame_control); > memcpy(skb_push(msdu, hdr_len), hdr, hdr_len); > @@ -1240,6 +1304,7 @@ static void ath10k_htt_rx_h_undecap(struct ath10k *ar, > struct sk_buff *msdu, > struct ieee80211_rx_status *status, > u8 first_hdr[64], > + struct htt_rx_desc *first_rxd, > enum htt_rx_mpdu_encrypt_type enctype, > bool is_decrypted) > { > @@ -1263,17 +1328,20 @@ static void ath10k_htt_rx_h_undecap(struct ath10k *ar, > > switch (decap) { > case RX_MSDU_DECAP_RAW: > - ath10k_htt_rx_h_undecap_raw(ar, msdu, status, enctype, > - is_decrypted); > + ath10k_htt_rx_h_undecap_raw(ar, msdu, first_rxd, status, > + enctype, 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_rxd, > + first_hdr, enctype); > break; > case RX_MSDU_DECAP_ETHERNET2_DIX: > - ath10k_htt_rx_h_undecap_eth(ar, msdu, status, first_hdr, enctype); > + ath10k_htt_rx_h_undecap_eth(ar, msdu, status, first_rxd, > + 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_rxd, > + first_hdr, enctype); > break; > } > } > @@ -1316,7 +1384,8 @@ 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; > @@ -1406,14 +1475,20 @@ 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); > - ath10k_htt_rx_h_undecap(ar, msdu, status, first_hdr, enctype, > - is_decrypted); > + ath10k_htt_rx_h_undecap(ar, msdu, status, first_hdr, > + (void *)first->data - sizeof(*rxd), > + enctype, is_decrypted); > > /* Undecapping involves copying the original 802.11 header back > * to sk_buff. If frame is protected and hardware has decrypted > @@ -1424,6 +1499,9 @@ 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 +1512,9 @@ 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 +1523,13 @@ 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 +1672,7 @@ 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 +2011,7 @@ 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: > > --- htt_rx.c    (revision 3656) +++ htt_rx.c    (working copy) @@ -550,6 +550,11 @@                 return IEEE80211_TKIP_IV_LEN;         case HTT_RX_MPDU_ENCRYPT_AES_CCM_WPA2:                 return IEEE80211_CCMP_HDR_LEN; +       case HTT_RX_MPDU_ENCRYPT_AES_CCMP_256: +               return IEEE80211_CCMP_256_HDR_LEN; +       case HTT_RX_MPDU_ENCRYPT_AES_GCMP_128: +       case HTT_RX_MPDU_ENCRYPT_AES_GCMP_256: +               return IEEE80211_GCMP_HDR_LEN;         case HTT_RX_MPDU_ENCRYPT_WEP128:         case HTT_RX_MPDU_ENCRYPT_WAPI:                 break; @@ -575,6 +580,11 @@                 return IEEE80211_TKIP_ICV_LEN;         case HTT_RX_MPDU_ENCRYPT_AES_CCM_WPA2:                 return IEEE80211_CCMP_MIC_LEN; +       case HTT_RX_MPDU_ENCRYPT_AES_CCMP_256: +               return IEEE80211_CCMP_256_MIC_LEN; +       case HTT_RX_MPDU_ENCRYPT_AES_GCMP_128: +       case HTT_RX_MPDU_ENCRYPT_AES_GCMP_256: +               return IEEE80211_GCMP_MIC_LEN;         case HTT_RX_MPDU_ENCRYPT_WEP128:         case HTT_RX_MPDU_ENCRYPT_WAPI:                 break; @@ -1012,6 +1022,7 @@                 return;         case HTT_RX_MPDU_ENCRYPT_WEP40:         case HTT_RX_MPDU_ENCRYPT_WEP104: +       case HTT_RX_MPDU_ENCRYPT_WEP128:                 hdr = skb_push(msdu, IEEE80211_WEP_IV_LEN);                 memcpy(hdr, rxd->mpdu_start.pn, IEEE80211_WEP_IV_LEN - 1);                 hdr[3] = rxd->msdu_end.common.key_id_octet; @@ -1032,7 +1043,21 @@                 hdr[3] = 0x20 | (rxd->msdu_end.common.key_id_octet << 6);                 memcpy(hdr + 4, rxd->mpdu_start.pn + 2, 4);                 return; -       case HTT_RX_MPDU_ENCRYPT_WEP128: +       case HTT_RX_MPDU_ENCRYPT_AES_CCMP_256: +               hdr = skb_push(msdu, IEEE80211_CCMP_256_HDR_LEN); +               memcpy(hdr, rxd->mpdu_start.pn, 2); +               hdr[2] = 0; +               hdr[3] = 0x20 | (rxd->msdu_end.common.key_id_octet << 6); +               memcpy(hdr + 4, rxd->mpdu_start.pn + 2, 4); +               return; +       case HTT_RX_MPDU_ENCRYPT_AES_GCMP_128: +       case HTT_RX_MPDU_ENCRYPT_AES_GCMP_256: +               hdr = skb_push(msdu, IEEE80211_GCMP_HDR_LEN); +               memcpy(hdr, rxd->mpdu_start.pn, 2); +               hdr[2] = 0; +               hdr[3] = 0x20 | (rxd->msdu_end.common.key_id_octet << 6); +               memcpy(hdr + 4, rxd->mpdu_start.pn + 2, 4); +               return;         case HTT_RX_MPDU_ENCRYPT_WAPI:                 return;         default: @@ -1098,16 +1123,41 @@         hdr = (void *)msdu->data;         /* MIC */ -       if ((status->flag & RX_FLAG_MIC_STRIPPED) && -           enctype == HTT_RX_MPDU_ENCRYPT_AES_CCM_WPA2) -               skb_trim(msdu, msdu->len - 8); - +       if (status->flag & RX_FLAG_MIC_STRIPPED) { +           switch(enctype) +           { +           case HTT_RX_MPDU_ENCRYPT_AES_CCM_WPA2: +           skb_trim(msdu, msdu->len - IEEE80211_CCMP_MIC_LEN); +           break; +           case HTT_RX_MPDU_ENCRYPT_AES_CCMP_256: +           skb_trim(msdu, msdu->len - IEEE80211_CCMP_256_MIC_LEN); +           break; +           case HTT_RX_MPDU_ENCRYPT_AES_GCMP_128: +           skb_trim(msdu, msdu->len - IEEE80211_GCMP_MIC_LEN); +           break; +           case HTT_RX_MPDU_ENCRYPT_AES_GCMP_256: +           skb_trim(msdu, msdu->len - IEEE80211_GCMP_MIC_LEN); +           break; +           default: +           break; +           } +       }         /* ICV */ -       if (status->flag & RX_FLAG_ICV_STRIPPED && -           enctype != HTT_RX_MPDU_ENCRYPT_AES_CCM_WPA2) +       if (status->flag & RX_FLAG_ICV_STRIPPED) { +           switch(enctype) +           { +           case HTT_RX_MPDU_ENCRYPT_WEP40: +           case HTT_RX_MPDU_ENCRYPT_WEP104: +           case HTT_RX_MPDU_ENCRYPT_TKIP_WITHOUT_MIC: +           case HTT_RX_MPDU_ENCRYPT_WEP128: +           case HTT_RX_MPDU_ENCRYPT_TKIP_WPA:                 skb_trim(msdu, msdu->len -                          ath10k_htt_rx_crypto_tail_len(ar, enctype)); - +           break; +           default: +           break; +           } +       }         /* MMIC */         if ((status->flag & RX_FLAG_MMIC_STRIPPED) &&             !ieee80211_has_morefrags(hdr->frame_control) && Index: rx_desc.h =================================================================== --- rx_desc.h   (revision 3656) +++ rx_desc.h   (working copy) @@ -239,6 +239,9 @@         HTT_RX_MPDU_ENCRYPT_WAPI             = 5,         HTT_RX_MPDU_ENCRYPT_AES_CCM_WPA2     = 6,         HTT_RX_MPDU_ENCRYPT_NONE             = 7, +       HTT_RX_MPDU_ENCRYPT_AES_CCMP_256     = 8, +       HTT_RX_MPDU_ENCRYPT_AES_GCMP_128     = 9, +       HTT_RX_MPDU_ENCRYPT_AES_GCMP_256     = 10,  };  #define RX_MPDU_START_INFO0_PEER_IDX_MASK     0x000007ff