From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [PATCH net] ipv6: Fix IPv6 packet loss in scenarios involving roaming + snooping switches Date: Mon, 06 Feb 2017 11:43:29 -0500 (EST) Message-ID: <20170206.114329.1196570425826508517.davem@davemloft.net> References: <20170203071103.25976-1-linus.luessing@c0d3.blue> Mime-Version: 1.0 Content-Type: Text/Plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Cc: yoshfuji@linux-ipv6.org, netdev@vger.kernel.org, bridge@lists.linux-foundation.org, linux-wireless@vger.kernel.org, jmorris@namei.org, linux-kernel@vger.kernel.org, monis@voltaire.com, kuznet@ms2.inr.ac.ru, kaber@trash.net To: linus.luessing@c0d3.blue Return-path: In-Reply-To: <20170203071103.25976-1-linus.luessing@c0d3.blue> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: bridge-bounces@lists.linux-foundation.org Errors-To: bridge-bounces@lists.linux-foundation.org List-Id: netdev.vger.kernel.org From: Linus L=FCssing Date: Fri, 3 Feb 2017 08:11:03 +0100 > When for instance a mobile Linux device roams from one access point t= o > another with both APs sharing the same broadcast domain and a > multicast snooping switch in between: > = > 1) (c) <~~~> (AP1) <--[SSW]--> (AP2) > = > 2) (AP1) <--[SSW]--> (AP2) <~~~> (c) > = > Then currently IPv6 multicast packets will get lost for (c) until an > MLD Querier sends its next query message. The packet loss occurs > because upon roaming the Linux host so far stayed silent regarding > MLD and the snooping switch will therefore be unaware of the > multicast topology change for a while. > = > This patch fixes this by always resending MLD reports when an interfa= ce > change happens, for instance from NO-CARRIER to CARRIER state. > = > Signed-off-by: Linus L=FCssing Looks good to me, applied, thanks.