From: Hangbin Liu <liuhang...@gmail.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 <yi...@redhat.com>
> Signed-off-by: Hangbin Liu <liuhang...@gmail.com>
Applied.
