netdev - Re: [PATCH net] net: bridge: remove ipv6 zero address check in mcast queries

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Date:   Sun, 28 Oct 2018 19:18:41 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     nikolay@...ulusnetworks.com
Cc:     netdev@...r.kernel.org, roopa@...ulusnetworks.com,
        liuhangbin@...il.com, yinxu@...hat.com,
        bridge@...ts.linux-foundation.org
Subject: Re: [PATCH net] net: bridge: remove ipv6 zero address check in
 mcast queries

From: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Date: Sat, 27 Oct 2018 12:07:47 +0300

> Recently a check was added which prevents marking of routers with zero
> source address, but for IPv6 that cannot happen as the relevant RFCs
> actually forbid such packets:
> RFC 2710 (MLDv1):
> "To be valid, the Query message MUST
>  come from a link-local IPv6 Source Address, be at least 24 octets
>  long, and have a correct MLD checksum."
> 
> Same goes for RFC 3810.
> 
> And also it can be seen as a requirement in ipv6_mc_check_mld_query()
> which is used by the bridge to validate the message before processing
> it. Thus any queries with :: source address won't be processed anyway.
> So just remove the check for zero IPv6 source address from the query
> processing function.
> 
> Fixes: 5a2de63fd1a5 ("bridge: do not add port to router list when receives query with source 0.0.0.0")
> Signed-off-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>

Applied.