bridge: join all-snoopers multicast address

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Next to snooping IGMP/MLD queries RFC4541, section 2.1.1.a) recommends
to snoop multicast router advertisements to detect multicast routers.

Multicast router advertisements are sent to an "all-snoopers"
multicast address. To be able to receive them reliably, we need to
join this group.

Otherwise other snooping switches might refrain from forwarding these
advertisements to us.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Linus Lüssing 2019-01-21 07:26:27 +01:00 • committed by David S. Miller

parent a2e2ca3beb

commit 4effd28c12

3 changed files with 78 additions and 5 deletions

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9

include/uapi/linux/in.h

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