Re: [PATCH] IGMP: Inhibit reports for local multicast groups

From: David Miller
Date: Fri Aug 28 2015 - 16:29:14 EST

From: Philip Downey <pdowney@xxxxxxxxxxx>
Date: Thu, 27 Aug 2015 16:46:26 +0100

> The range of addresses between and inclusive, is
> reserved for the use of routing protocols and other low-level topology
> discovery or maintenance protocols, such as gateway discovery and
> group membership reporting. Multicast routers should not forward any
> multicast datagram with destination addresses in this range,
> regardless of its TTL.
> Currently, IGMP reports are generated for this reserved range of
> addresses even though a router will ignore this information since it
> has no purpose. However, the presence of reserved group addresses in
> an IGMP membership report uses up network bandwidth and can also
> obscure addresses of interest when inspecting membership reports using
> packet inspection or debug messages.
> Although the RFCs for the various version of IGMP (e.g.RFC 3376 for
> v3) do not specify that the reserved addresses be excluded from
> membership reports, it should do no harm in doing so. In particular
> there should be no adverse effect in any IGMP snooping functionality
> since 224.0.0.x is specifically excluded as per RFC 4541 (IGMP and MLD
> Snooping Switches Considerations) section 2.1.2. Data Forwarding
> Rules:
> 2) Packets with a destination IP (DIP) address in the 224.0.0.X
> range which are not IGMP must be forwarded on all ports.
> IGMP reports for local multicast groups can now be optionally
> inhibited by means of a system control variable (by setting the value
> to zero) e.g.:
> echo 0 > /proc/sys/net/ipv4/igmp_link_local_mcast_reports
> To retain backwards compatibility the previous behaviour is retained
> by default on system boot or reverted by setting the value back to
> non-zero e.g.:
> echo 1 > /proc/sys/net/ipv4/igmp_link_local_mcast_reports
> Signed-off-by: Philip Downey <pdowney@xxxxxxxxxxx>

Applied to net-next, thanks.
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