From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 52F24ECDE47 for ; Mon, 22 Oct 2018 10:21:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1A8C920853 for ; Mon, 22 Oct 2018 10:21:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="MI/58QSm" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1A8C920853 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729286AbeJVSjo (ORCPT ); Mon, 22 Oct 2018 14:39:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:50616 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729246AbeJVSjm (ORCPT ); Mon, 22 Oct 2018 14:39:42 -0400 Received: from sasha-vm.mshome.net (unknown [167.98.65.38]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7B9742087D; Mon, 22 Oct 2018 10:21:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1540203707; bh=zpkhgtrraYpvW6xJa3yobM4YrndWYVBvp7uwbxy8cKE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MI/58QSmQtaUE00y2ETAxYvaoYtU+Rsr/+476A46GGyG3ZuR2ebIXGzFCKJh7fEey yPwfJ37O7fkMru8XBgAXEHpcV0FO9J7TvgHzbVJO0ax1bcHFL53agy9tS91txe9qvC zI6VDdDjye4jP5CvgrcoBd9LhKHM/JpxoEFMvB0g= From: Sasha Levin To: stable@vger.kernel.org, linux-kernel@vger.kernel.org Cc: David Howells , Sasha Levin Subject: [PATCH AUTOSEL 4.9 6/9] rxrpc: Only take the rwind and mtu values from latest ACK Date: Mon, 22 Oct 2018 06:21:30 -0400 Message-Id: <20181022102133.41222-6-sashal@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181022102133.41222-1-sashal@kernel.org> References: <20181022102133.41222-1-sashal@kernel.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: David Howells [ Upstream commit 298bc15b2079c324e82d0a6fda39c3d762af7282 ] Move the out-of-order and duplicate ACK packet check to before the call to rxrpc_input_ackinfo() so that the receive window size and MTU size are only checked in the latest ACK packet and don't regress. Fixes: 248f219cb8bc ("rxrpc: Rewrite the data and ack handling code") Signed-off-by: David Howells Signed-off-by: Sasha Levin --- net/rxrpc/input.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c index 7bfde4737cb3..a4380e182e6c 100644 --- a/net/rxrpc/input.c +++ b/net/rxrpc/input.c @@ -808,6 +808,16 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb, rxrpc_propose_ack_respond_to_ack); } + /* Discard any out-of-order or duplicate ACKs. */ + if (before_eq(sp->hdr.serial, call->acks_latest)) { + _debug("discard ACK %d <= %d", + sp->hdr.serial, call->acks_latest); + return; + } + call->acks_latest_ts = skb->tstamp; + call->acks_latest = sp->hdr.serial; + + /* Parse rwind and mtu sizes if provided. */ ioffset = offset + nr_acks + 3; if (skb->len >= ioffset + sizeof(buf.info)) { if (skb_copy_bits(skb, ioffset, &buf.info, sizeof(buf.info)) < 0) @@ -829,15 +839,6 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb, return; } - /* Discard any out-of-order or duplicate ACKs. */ - if (before_eq(sp->hdr.serial, call->acks_latest)) { - _debug("discard ACK %d <= %d", - sp->hdr.serial, call->acks_latest); - return; - } - call->acks_latest_ts = skb->tstamp; - call->acks_latest = sp->hdr.serial; - if (before(hard_ack, call->tx_hard_ack) || after(hard_ack, call->tx_top)) return rxrpc_proto_abort("AKW", call, 0); -- 2.17.1