netdev - Re: [PATCH net] bridge: do not add port to router list when receives query with source 0.0.0.0

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Date:   Fri, 26 Oct 2018 16:02:07 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     liuhangbin@...il.com
Cc:     netdev@...r.kernel.org, nikolay@...ulusnetworks.com,
        jiri@...lanox.com, linus.luessing@...3.blue
Subject: Re: [PATCH net] bridge: do not add port to router list when
 receives query with source 0.0.0.0

From: Hangbin Liu <liuhangbin@...il.com>
Date: Fri, 26 Oct 2018 10:28:43 +0800

> Based on RFC 4541, 2.1.1.  IGMP Forwarding Rules
> 
>   The switch supporting IGMP snooping must maintain a list of
>   multicast routers and the ports on which they are attached.  This
>   list can be constructed in any combination of the following ways:
> 
>   a) This list should be built by the snooping switch sending
>      Multicast Router Solicitation messages as described in IGMP
>      Multicast Router Discovery [MRDISC].  It may also snoop
>      Multicast Router Advertisement messages sent by and to other
>      nodes.
> 
>   b) The arrival port for IGMP Queries (sent by multicast routers)
>      where the source address is not 0.0.0.0.
> 
> We should not add the port to router list when receives query with source
> 0.0.0.0.
> 
> Reported-by: Ying Xu <yinxu@...hat.com>
> Signed-off-by: Hangbin Liu <liuhangbin@...il.com>

Applied and queued up for -stable, thanks.