Re: [quicwg/base-drafts] Don't store or retransmit PATH_RESPONSE frames, avoid buffering (#2729)

ianswett <notifications@github.com> Tue, 21 May 2019 10:40 UTC

Return-Path: <noreply@github.com>
X-Original-To: quic-issues@ietfa.amsl.com
Delivered-To: quic-issues@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A55E9120021 for <quic-issues@ietfa.amsl.com>; Tue, 21 May 2019 03:40:33 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -6.606
X-Spam-Level:
X-Spam-Status: No, score=-6.606 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_IMAGE_ONLY_28=1.404, HTML_MESSAGE=0.001, MAILING_LIST_MULTI=-1, RCVD_IN_DNSWL_HI=-5, SPF_PASS=-0.001, T_DKIMWL_WL_HIGH=-0.01] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=github.com
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id W62bh6HA87Ml for <quic-issues@ietfa.amsl.com>; Tue, 21 May 2019 03:40:31 -0700 (PDT)
Received: from out-4.smtp.github.com (out-4.smtp.github.com [192.30.252.195]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 88FB9120108 for <quic-issues@ietf.org>; Tue, 21 May 2019 03:40:31 -0700 (PDT)
Date: Tue, 21 May 2019 03:40:30 -0700
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=github.com; s=pf2014; t=1558435230; bh=WkrhUOhZn8ML/qhw+G1wkSqhkGRRg0m3UV2cI8/7Up0=; h=Date:From:Reply-To:To:Cc:In-Reply-To:References:Subject:List-ID: List-Archive:List-Post:List-Unsubscribe:From; b=b8+bDBVItOcOzER5Cp79OdTzJrW52VyM8QAkRUYTGH9f5JYvI/xD5PBJMZp9LI4rf 9rv3KwRWJ8TeOJuhb9DosXkktYOGqPMN9Nh6vjBGFZ7DTXMq2RdG4Ln9QWJ37GFwuV NVVIPsLBajk5EYTxw1FMnE8gFTFLGV4fiSahgO7k=
From: ianswett <notifications@github.com>
Reply-To: quicwg/base-drafts <reply+AFTOJK6KEWBM2PTJL3CV3EV26EEB5EVBNHHBVGEZF4@reply.github.com>
To: quicwg/base-drafts <base-drafts@noreply.github.com>
Cc: Subscribed <subscribed@noreply.github.com>
Message-ID: <quicwg/base-drafts/pull/2729/review/239963246@github.com>
In-Reply-To: <quicwg/base-drafts/pull/2729@github.com>
References: <quicwg/base-drafts/pull/2729@github.com>
Subject: Re: [quicwg/base-drafts] Don't store or retransmit PATH_RESPONSE frames, avoid buffering (#2729)
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="--==_mimepart_5ce3d59eb2f7_5e643f89c42cd96c10717f6"; charset="UTF-8"
Content-Transfer-Encoding: 7bit
Precedence: list
X-GitHub-Sender: ianswett
X-GitHub-Recipient: quic-issues
X-GitHub-Reason: subscribed
X-Auto-Response-Suppress: All
X-GitHub-Recipient-Address: quic-issues@ietf.org
Archived-At: <https://mailarchive.ietf.org/arch/msg/quic-issues/4ve9mtf1Ft7pu1eAkVrigrfHIuY>
X-BeenThere: quic-issues@ietf.org
X-Mailman-Version: 2.1.29
List-Id: Notification list for GitHub issues related to the QUIC WG <quic-issues.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/quic-issues>, <mailto:quic-issues-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/quic-issues/>
List-Post: <mailto:quic-issues@ietf.org>
List-Help: <mailto:quic-issues-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/quic-issues>, <mailto:quic-issues-request@ietf.org?subject=subscribe>
X-List-Received-Date: Tue, 21 May 2019 10:40:34 -0000

ianswett commented on this pull request.



> @@ -1722,6 +1722,10 @@ it can associate the peer's response with the corresponding PATH_CHALLENGE.
 
 On receiving a PATH_CHALLENGE frame, an endpoint MUST respond immediately by
 echoing the data contained in the PATH_CHALLENGE frame in a PATH_RESPONSE frame.
+An endpoint MUST NOT store or retransmit a PATH_RESPONSE frame, as a new
+PATH_CHALLENGE frame will be sent if another PATH_RESPONSE frame is needed.  An
+endpoint MAY choose to limit the number of pending PATH_RESPONSE frames

It'd actually be slightly better to respond to the later ones, if possible.  That being said, if you're in this state, it's likely a bug in the peer or an attack.

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/quicwg/base-drafts/pull/2729#discussion_r285961239