linux-kernel - [PATCH 0/1] Create multicast snooping sysctl option

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Message-Id: <20210617095020.28628-1-callum.sinclair@alliedtelesis.co.nz>
Date:   Thu, 17 Jun 2021 21:50:19 +1200
From:   Callum Sinclair <callum.sinclair@...iedtelesis.co.nz>
To:     dsahern@...nel.org, nikolay@...dia.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linus.luessing@...3.blue,
        Callum Sinclair <callum.sinclair@...iedtelesis.co.nz>
Subject: [PATCH 0/1] Create multicast snooping sysctl option

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