From nobody Wed Feb 11 10:48:04 2026 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 37C7AC7EE22 for ; Tue, 9 May 2023 22:16:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235703AbjEIWQk (ORCPT ); Tue, 9 May 2023 18:16:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53732 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235281AbjEIWQX (ORCPT ); Tue, 9 May 2023 18:16:23 -0400 Received: from mail-wm1-x329.google.com (mail-wm1-x329.google.com [IPv6:2a00:1450:4864:20::329]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7D3B046A2 for ; Tue, 9 May 2023 15:16:22 -0700 (PDT) Received: by mail-wm1-x329.google.com with SMTP id 5b1f17b1804b1-3f42b984405so9829655e9.3 for ; Tue, 09 May 2023 15:16:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arista.com; s=google; t=1683670581; x=1686262581; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=Lc+xA7tlcC6A/HLIGYglx4S12hhfgqdXTKqlDOHD+8g=; b=MzlgfUUAYES98I8Blt0uDfqbqzdhCiYd3z2QxUhekOknoxQbNIgpLRyzMq1Xmch7h8 HItqYCSavUCqWy6kHsNZ0BcKI0OVSRDn6fwwYEQTXfplkFaQkswuICiX2I3//M9E6kAB P2nMX2EJLEkjUiRmfAAJoiyX555vwsTfgrWbc6FYyR/Pab9SfAR5yRxBmcBmTuaTDhmf jz/2BVV0PIEB5rr4S6tBalg4PrONuoUJJVDKZoAR+ajpq3NwV9XoZ8Lq2Nc2Avbp4q9O tXCn4Yl6HwngLAP+Lu+i6S3wv4Uhh/lPDtEwx1EtJpazHkWWT3scsIQqIIemzg+mHVwv Jrdg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683670581; x=1686262581; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Lc+xA7tlcC6A/HLIGYglx4S12hhfgqdXTKqlDOHD+8g=; b=e7nboUehhW3eh8B3RnjK1JuJ852PomWzmK3d/M29BQKxUQ/jaRqDneduDL4kLZynnY 1ZOzv3uoWhEkb1A9/3x0EW2cTCrg/bgtn+M0jFiuHIxFL3TyDN4H0tFYan8iVpex02O8 9uAE3pUo0PTaylvuwU/+xWUhbjt0TpYwb+v9rq0Z22s6BuJia7IRRxEFI8S33wb/H2lI MdZ9aoK36Xt/ot1iRdtZz77LQak0xXouxIH3yg5u/NBlXQjlg5OQI4ny1ptBNPTgh8D6 cs3mGHICS0gHc9TOjb9Cm0syXxI1vauqcFfXdVW64gsLcC6VOLsLVGKHxphTzEfHNlB/ Utqg== X-Gm-Message-State: AC+VfDzckS2F/HYHEUlTIbP97WYaHiOE5C6/uTzPrKCvo/rPJeiBLJQ7 w1Sk0RlPpWcofQQBry9D5KKRS561cf5xecwAW7c= X-Google-Smtp-Source: ACHHUZ53khA8ZUPP0QlnwjV+NGrdwIuAZcQJbHfVX3TMwqEq0wSrQhmpuHxdHD0QKJFqU+ila5I/Bg== X-Received: by 2002:a1c:f20a:0:b0:3f1:819d:d050 with SMTP id s10-20020a1cf20a000000b003f1819dd050mr10537973wmc.37.1683670580862; Tue, 09 May 2023 15:16:20 -0700 (PDT) Received: from Mindolluin.ire.aristanetworks.com ([217.173.96.166]) by smtp.gmail.com with ESMTPSA id t25-20020a7bc3d9000000b003f42d3111b8sm2052888wmj.30.2023.05.09.15.16.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 May 2023 15:16:20 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: Dmitry Safonov , Dmitry Safonov <0x7f454c46@gmail.com>, Hideaki YOSHIFUJI , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [RFC 5/5] net/tcp-md5: Don't send ACK if key (dis)appears Date: Tue, 9 May 2023 23:16:08 +0100 Message-Id: <20230509221608.2569333-6-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230509221608.2569333-1-dima@arista.com> References: <20230509221608.2569333-1-dima@arista.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" To mirror RST paranoid checks and tcp_inbound_md5_hash(). Signed-off-by: Dmitry Safonov --- net/ipv4/tcp_ipv4.c | 2 ++ net/ipv6/tcp_ipv6.c | 2 ++ 2 files changed, 4 insertions(+) diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index d94cd5e70d58..0c8893240f70 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -918,6 +918,8 @@ static void tcp_v4_send_ack(const struct sock *sk, rep.th.window =3D htons(win); =20 #ifdef CONFIG_TCP_MD5SIG + if (unlikely(!!key !=3D !!tcp_parse_md5sig_option(th))) + return; if (key) { int offset =3D (tsecr) ? 3 : 0; =20 diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 498dfa194b8b..4131ada9fabf 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -863,6 +863,8 @@ static void tcp_v6_send_response(const struct sock *sk,= struct sk_buff *skb, u32 if (tsecr) tot_len +=3D TCPOLEN_TSTAMP_ALIGNED; #ifdef CONFIG_TCP_MD5SIG + if (!rst && unlikely(!!key !=3D !!tcp_parse_md5sig_option(th))) + return; if (key) tot_len +=3D TCPOLEN_MD5SIG_ALIGNED; #endif --=20 2.40.0