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bridge: Snoop Multicast Router Advertisements

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When multiple multicast routers are present in a broadcast domain then
only one of them will be detectable via IGMP/MLD query snooping. The
multicast router with the lowest IP address will become the selected and
active querier while all other multicast routers will then refrain from
sending queries.

To detect such rather silent multicast routers, too, RFC4286
("Multicast Router Discovery") provides a standardized protocol to
detect multicast routers for multicast snooping switches.

This patch implements the necessary MRD Advertisement message parsing
and after successful processing adds such routers to the internal
multicast router list.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Linus Lüssing 2019-01-21 07:26:28 +01:00 • committed by David S. Miller
parent 4effd28c12
commit 4b3087c7e3
6 changed files with 82 additions and 1 deletions
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2
include/uapi/linux/icmpv6.h
View file

@ -108,6 +108,8 @@ struct icmp6hdr {
#define ICMPV6_MOBILE_PREFIX_SOL 146
#define ICMPV6_MOBILE_PREFIX_ADV 147
#define ICMPV6_MRDISC_ADV 151
/*
* Codes for Destination Unreachable
*/