linux-kernel - Re: [PATCH net] ipv6: Fix IPv6 packet loss in scenarios involving roaming + snooping switches

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Date:   Mon, 06 Feb 2017 11:43:29 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     linus.luessing@...3.blue
Cc:     netdev@...r.kernel.org, kuznet@....inr.ac.ru, jmorris@...ei.org,
        yoshfuji@...ux-ipv6.org, kaber@...sh.net, monis@...taire.com,
        bridge@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux-wireless@...r.kernel.org
Subject: Re: [PATCH net] ipv6: Fix IPv6 packet loss in scenarios involving
 roaming + snooping switches

From: Linus Lüssing <linus.luessing@...3.blue>
Date: Fri,  3 Feb 2017 08:11:03 +0100

> When for instance a mobile Linux device roams from one access point to
> 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 interface
> change happens, for instance from NO-CARRIER to CARRIER state.
> 
> Signed-off-by: Linus Lüssing <linus.luessing@...3.blue>

Looks good to me, applied, thanks.