netdev - Re: [PATCH net] ipv4/igmp: fix v1/v2 switchback timeout based on rfc3376, 8.12

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Date:   Mon, 29 Oct 2018 20:26:59 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     liuhangbin@...il.com
Cc:     netdev@...r.kernel.org, daniel@...earbox.net,
        hannes@...essinduktion.org, xiyou.wangcong@...il.com
Subject: Re: [PATCH net] ipv4/igmp: fix v1/v2 switchback timeout based on
 rfc3376, 8.12

From: Hangbin Liu <liuhangbin@...il.com>
Date: Fri, 26 Oct 2018 11:30:35 +0800

> Similiar with ipv6 mcast commit 89225d1ce6af3 ("net: ipv6: mld: fix v1/v2
> switchback timeout to rfc3810, 9.12.")
> 
> i) RFC3376 8.12. Older Version Querier Present Timeout says:
> 
>    The Older Version Querier Interval is the time-out for transitioning
>    a host back to IGMPv3 mode once an older version query is heard.
>    When an older version query is received, hosts set their Older
>    Version Querier Present Timer to Older Version Querier Interval.
> 
>    This value MUST be ((the Robustness Variable) times (the Query
>    Interval in the last Query received)) plus (one Query Response
>    Interval).
> 
> Currently we only use a hardcode value IGMP_V1/v2_ROUTER_PRESENT_TIMEOUT.
> Fix it by adding two new items mr_qi(Query Interval) and mr_qri(Query Response
> Interval) in struct in_device.
> 
> Now we can calculate the switchback time via (mr_qrv * mr_qi) + mr_qri.
> We need update these values when receive IGMPv3 queries.
> 
> Reported-by: Ying Xu <yinxu@...hat.com>
> Signed-off-by: Hangbin Liu <liuhangbin@...il.com>

Applied.