Messages in this thread | | | Date | Thu, 13 Sep 2018 08:17:42 -0700 (PDT) | Subject | Re: [PATCH 1/1] ipv6: Add sockopt IPV6_MULTICAST_ALL analogue to IP_MULTICAST_ALL | From | David Miller <> |
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From: Andre Naujoks <nautsch2@gmail.com> Date: Mon, 10 Sep 2018 10:27:15 +0200
> The socket option will be enabled by default to ensure current behaviour > is not changed. This is the same for the IPv4 version. > > A socket bound to in6addr_any and a specific port will receive all traffic > on that port. Analogue to IP_MULTICAST_ALL, disable this behaviour, if > one or more multicast groups were joined (using said socket) and only > pass on multicast traffic from groups, which were explicitly joined via > this socket. > > Without this option disabled a socket (system even) joined to multiple > multicast groups is very hard to get right. Filtering by destination > address has to take place in user space to avoid receiving multicast > traffic from other multicast groups, which might have traffic on the same > port. > > The extension of the IP_MULTICAST_ALL socketoption to just apply to ipv6, > too, is not done to avoid changing the behaviour of current applications. > > Signed-off-by: Andre Naujoks <nautsch2@gmail.com> > Acked-By: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Applied to net-next, thank you.
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