[PATCH 0/1] Create multicast snooping sysctl option

[Callum Sinclair]

IGMP and MLD packets can be received on IP sockets but only if the
group has been explicitly joined. This makes snooping all multicast
packets in the ranges 224.0.0.0/8 and FF00::/8 difficult as each
group in these ranges would have to be added via socketopt calls
individually.

It is possible to get all IGMP and MLD packets by creating a packet
socket and using a BPF to grab only IGMP and MLD packets but this
removes some of the other useful options IP sockets have.

Define a new sysctl to allow one or more interfaces to be defined
as a IGMP and/or MLD Snooping device. This means all multicast
packets will be received on a socket bound to the interface without
being explicitly asked for.

Callum Sinclair (1):
  net: Allow all multicast packets to be received on a interface.

 Documentation/networking/ip-sysctl.rst |  8 ++++++++
 include/linux/inetdevice.h             |  1 +
 include/linux/ipv6.h                   |  1 +
 include/uapi/linux/ip.h                |  1 +
 include/uapi/linux/ipv6.h              |  1 +
 include/uapi/linux/netconf.h           |  1 +
 include/uapi/linux/sysctl.h            |  1 +
 net/ipv4/devinet.c                     |  7 +++++++
 net/ipv4/igmp.c                        |  5 +++++
 net/ipv6/addrconf.c                    | 14 ++++++++++++++
 net/ipv6/mcast.c                       |  5 +++++
 11 files changed, 45 insertions(+)

-- 
2.32.0