[pim] Group-Specific Queries dropped by kernel

<mal.hubert@bt.com> Fri, 12 April 2019 12:34 UTC

Return-Path: <mal.hubert@bt.com>
X-Original-To: pim@ietfa.amsl.com
Delivered-To: pim@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EC36A1202C5 for <pim@ietfa.amsl.com>; Fri, 12 Apr 2019 05:34:59 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.6
X-Spam-Level:
X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
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 TpsBurENR7bx for <pim@ietfa.amsl.com>; Fri, 12 Apr 2019 05:34:57 -0700 (PDT)
Received: from smtpb1.bt.com (smtpb1.bt.com [62.7.242.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 35F7F1201B1 for <pim@ietf.org>; Fri, 12 Apr 2019 05:34:56 -0700 (PDT)
Received: from rew09926dag07b.domain1.systemhost.net (10.55.202.38) by EVMED03-UKBR.bt.com (10.216.161.33) with Microsoft SMTP Server (TLS) id 14.3.408.0; Fri, 12 Apr 2019 13:34:51 +0100
Received: from rew09926dag07b.domain1.systemhost.net (10.55.202.38) by rew09926dag07b.domain1.systemhost.net (10.55.202.38) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Fri, 12 Apr 2019 13:34:52 +0100
Received: from rew09926dag07b.domain1.systemhost.net ([fe80::3597:bc94:cdb8:9d49]) by rew09926dag07b.domain1.systemhost.net ([fe80::3597:bc94:cdb8:9d49%12]) with mapi id 15.00.1395.000; Fri, 12 Apr 2019 13:34:52 +0100
From: <mal.hubert@bt.com>
To: <pim@ietf.org>
Thread-Topic: Group-Specific Queries dropped by kernel
Thread-Index: AdTxLB/StBdCEYp1RDa29yj4Bqm5LA==
Date: Fri, 12 Apr 2019 12:34:52 +0000
Message-ID: <40be04cccedb47b78e62771e4aeaabda@rew09926dag07b.domain1.systemhost.net>
Accept-Language: en-GB, en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-ms-exchange-transport-fromentityheader: Hosted
x-originating-ip: [10.55.202.232]
Content-Type: multipart/alternative; boundary="_000_40be04cccedb47b78e62771e4aeaabdarew09926dag07bdomain1sy_"
MIME-Version: 1.0
Archived-At: <https://mailarchive.ietf.org/arch/msg/pim/zHUSGmzHaBKM6Mn-Z1NNMyUglEI>
Subject: [pim] Group-Specific Queries dropped by kernel
X-BeenThere: pim@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Protocol Independent Multicast <pim.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/pim>, <mailto:pim-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/pim/>
List-Post: <mailto:pim@ietf.org>
List-Help: <mailto:pim-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/pim>, <mailto:pim-request@ietf.org?subject=subscribe>
X-List-Received-Date: Fri, 12 Apr 2019 12:35:00 -0000

Hey

Hopefully someone on here can answer this basic query for me. It would appear that the Linux kernel by default will allow IGMPv3 "General Query" if it has a source IP of 0.0.0.0 but will drop any "Group-Specific Queries" if the source IP is 0.0.0.0. This doesn't appear to be specific to my implementation and seems to be the implementation in the Linux Kernel.

Some questions about this, if someone would be so kind as to help.


1)    Is this by design in the rfc3367 standard and would someone point out to me where it is and enlighten me as to why this is the case.

2)    Is this by design in the Kernel and would enlighten me as to why this is the case.

3)    Is this a bug in the Kernel and would it be worth raising on Kernel Bugzilla.

Many Thanks

Mal Hubert