Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D59AFC6FD1C for ; Tue, 14 Mar 2023 10:00:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229783AbjCNKAX (ORCPT ); Tue, 14 Mar 2023 06:00:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38844 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229749AbjCNKAO (ORCPT ); Tue, 14 Mar 2023 06:00:14 -0400 Received: from nbd.name (nbd.name [46.4.11.11]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DA6947040E for ; Tue, 14 Mar 2023 03:00:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=nbd.name; s=20160729; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=tbKE/nYJ+7Lun0DwdA+0fm889JkIwEA4/XvzMJWgXUc=; b=M+qu3+/tP67Dw85Q+w08A54FkZ 9X91gN6gvhCsExyq/OkfUJpiQ4nV0s/hP45ABZsUKXL4xUy80un1LXa2GQRrCtSvBRBl+1SJtxWI+ NYJDcCIwrxITPepFvX0+iqgVja9T+6Y0Ie6EYI4Uqkwoyc6gw/KIK5to7whr7qfo9/gg=; Received: from p54ae9730.dip0.t-ipconnect.de ([84.174.151.48] helo=Maecks.lan) by ds12 with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 (Exim 4.94.2) (envelope-from ) id 1pc1Ro-001pV5-RQ; Tue, 14 Mar 2023 11:00:00 +0100 From: Felix Fietkau To: linux-wireless@vger.kernel.org Cc: johannes@sipsolutions.net, Ryder Lee Subject: [PATCH 7/7] mac80211: implement support for yet another mesh A-MSDU format Date: Tue, 14 Mar 2023 10:59:56 +0100 Message-Id: <20230314095956.62085-7-nbd@nbd.name> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230314095956.62085-1-nbd@nbd.name> References: <20230314095956.62085-1-nbd@nbd.name> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org MT7996 hardware supports mesh A-MSDU subframes in hardware, but uses a big-endian length field Signed-off-by: Felix Fietkau Signed-off-by: Ryder Lee --- include/net/cfg80211.h | 11 +++++++---- net/mac80211/rx.c | 22 ++++++++++++++++------ net/mac80211/sta_info.h | 5 ++++- net/wireless/util.c | 36 +++++++++++++++++++++++------------- 4 files changed, 50 insertions(+), 24 deletions(-) diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index 7cebba1c4135..86cb048dc924 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -6274,10 +6274,13 @@ static inline int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr, * mesh control field. * * @skb: The input A-MSDU frame without any headers. - * @mesh_hdr: use standard compliant mesh A-MSDU subframe header + * @mesh_hdr: the type of mesh header to test + * 0: non-mesh A-MSDU length field + * 1: big-endian mesh A-MSDU length field + * 2: little-endian mesh A-MSDU length field * Returns: true if subframe header lengths are valid for the @mesh_hdr mode */ -bool ieee80211_is_valid_amsdu(struct sk_buff *skb, bool mesh_hdr); +bool ieee80211_is_valid_amsdu(struct sk_buff *skb, u8 mesh_hdr); /** * ieee80211_amsdu_to_8023s - decode an IEEE 802.11n A-MSDU frame @@ -6294,13 +6297,13 @@ bool ieee80211_is_valid_amsdu(struct sk_buff *skb, bool mesh_hdr); * @extra_headroom: The hardware extra headroom for SKBs in the @list. * @check_da: DA to check in the inner ethernet header, or NULL * @check_sa: SA to check in the inner ethernet header, or NULL - * @mesh_control: A-MSDU subframe header includes the mesh control field + * @mesh_control: see mesh_hdr in ieee80211_is_valid_amsdu */ void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list, const u8 *addr, enum nl80211_iftype iftype, const unsigned int extra_headroom, const u8 *check_da, const u8 *check_sa, - bool mesh_control); + u8 mesh_control); /** * ieee80211_get_8023_tunnel_proto - get RFC1042 or bridge tunnel encap protocol diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index 2a883d956260..3635d036375a 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -2983,13 +2983,23 @@ __ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset) return RX_DROP_UNUSABLE; if (rx->sta && rx->sta->amsdu_mesh_control < 0) { - bool valid_std = ieee80211_is_valid_amsdu(skb, true); - bool valid_nonstd = ieee80211_is_valid_amsdu(skb, false); + s8 valid = -1; + int i; + + for (i = 0; i <= 2; i++) { + if (!ieee80211_is_valid_amsdu(skb, i)) + continue; + + if (valid >= 0) { + /* ambiguous */ + valid = -1; + break; + } + + valid = i; + } - if (valid_std && !valid_nonstd) - rx->sta->amsdu_mesh_control = 1; - else if (valid_nonstd && !valid_std) - rx->sta->amsdu_mesh_control = 0; + rx->sta->amsdu_mesh_control = valid; } ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h index e8e482a82d77..f354d470e174 100644 --- a/net/mac80211/sta_info.h +++ b/net/mac80211/sta_info.h @@ -623,7 +623,10 @@ struct link_sta_info { * @cparams: CoDel parameters for this station. * @reserved_tid: reserved TID (if any, otherwise IEEE80211_TID_UNRESERVED) * @amsdu_mesh_control: track the mesh A-MSDU format used by the peer - * (-1: not yet known, 0: non-standard [without mesh header], 1: standard) + * (-1: not yet known, + * 0: non-mesh A-MSDU length field + * 1: big-endian mesh A-MSDU length field + * 2: little-endian mesh A-MSDU length field) * @fast_tx: TX fastpath information * @fast_rx: RX fastpath information * @tdls_chandef: a TDLS peer can have a wider chandef that is compatible to diff --git a/net/wireless/util.c b/net/wireless/util.c index d1a89e82ead0..3bc0c3072e78 100644 --- a/net/wireless/util.c +++ b/net/wireless/util.c @@ -776,7 +776,24 @@ __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen, return frame; } -bool ieee80211_is_valid_amsdu(struct sk_buff *skb, bool mesh_hdr) +static u16 +ieee80211_amsdu_subframe_length(void *field, u8 mesh_flags, u8 hdr_type) +{ + __le16 *field_le = field; + __be16 *field_be = field; + u16 len; + + if (hdr_type >= 2) + len = le16_to_cpu(*field_le); + else + len = be16_to_cpu(*field_be); + if (hdr_type) + len += __ieee80211_get_mesh_hdrlen(mesh_flags); + + return len; +} + +bool ieee80211_is_valid_amsdu(struct sk_buff *skb, u8 mesh_hdr) { int offset = 0, remaining, subframe_len, padding; @@ -790,12 +807,8 @@ bool ieee80211_is_valid_amsdu(struct sk_buff *skb, bool mesh_hdr) if (skb_copy_bits(skb, offset + 2 * ETH_ALEN, &hdr, sizeof(hdr)) < 0) return false; - if (mesh_hdr) - len = le16_to_cpu(*(__le16 *)&hdr.len) + - __ieee80211_get_mesh_hdrlen(hdr.mesh_flags); - else - len = ntohs(hdr.len); - + len = ieee80211_amsdu_subframe_length(&hdr.len, hdr.mesh_flags, + mesh_hdr); subframe_len = sizeof(struct ethhdr) + len; padding = (4 - subframe_len) & 0x3; remaining = skb->len - offset; @@ -812,7 +825,7 @@ void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list, const u8 *addr, enum nl80211_iftype iftype, const unsigned int extra_headroom, const u8 *check_da, const u8 *check_sa, - bool mesh_control) + u8 mesh_control) { unsigned int hlen = ALIGN(extra_headroom, 4); struct sk_buff *frame = NULL; @@ -837,11 +850,8 @@ void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list, skb_copy_bits(skb, offset, &hdr, copy_len); if (iftype == NL80211_IFTYPE_MESH_POINT) mesh_len = __ieee80211_get_mesh_hdrlen(hdr.flags); - if (mesh_control) - len = le16_to_cpu(*(__le16 *)&hdr.eth.h_proto) + mesh_len; - else - len = ntohs(hdr.eth.h_proto); - + len = ieee80211_amsdu_subframe_length(&hdr.eth.h_proto, hdr.flags, + mesh_control); subframe_len = sizeof(struct ethhdr) + len; padding = (4 - subframe_len) & 0x3; -- 2.39.0