On Thu, Jun 27, 2013 at 06:33:42PM -0700, Stephen Hemminger wrote:

On Fri, 28 Jun 2013 03:23:07 +0200
Hannes Frederic Sowa [off-list ref] wrote:

quoted

Hm, are you sure? NETCONFA_MC_FORWARDING is of type RTM_NEWNETCONF
and expects ncm_family to be either AF_INET or AF_INET6 (at least in
iproute2/ipmonitor.c).

I agree with Sven on this, looks like the recent addition of netconf
configuration to netlink didn't embrace how multicast is handled in kernel.

Multicast forwarding is a routing related configuration value.
All the multicast routing events come in as special family RTNL_FAMILY_IPMR
(see net/ipv4/ipmr.c function ipmr_fill_route). I would expect that multicast
routing daemons would like to be able to use special family to listen for
all multicast related changes (and not see non-multicast events).


Minor nit: the patch is formatted incorrectly (case should line up with switch).

Yes, this seems reasonable but would need a small update to ipnetconf.c, too.

Thanks,

  Hannes