RFR: 8241800: Disable IPV6_MULTICAST_ALL to prevent interference from all multicast groups [v4]

[Alan Bateman]

On Fri, 16 Jun 2023 16:35:14 GMT, Michael McMahon <michaelm at openjdk.org> wrote:

>> Hi,
>> 
>> Can I get the following change reviewed please? It disables the IPV6_MULTICAST_ALL socket option on UDP sockets on Linux systems which support the option (kernel version 4.20+). This has the effect of disabling the surprising default behavior of multicast sockets on Linux where sockets can receive packets sent to groups the receiver has not joined, if some other socket has joined that group on the same system.
>> 
>> The equivalent behavior has already been implemented for IPv4 sockets.
>> 
>> Thanks,
>> Michael.
>
> Michael McMahon has updated the pull request incrementally with one additional commit since the last revision:
> 
>   test update

test/jdk/java/nio/channels/DatagramChannel/Promiscuous.java line 212:

> 210:             }
> 211:         }
> 212: 

Version check removed, good!

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PR Review Comment: https://git.openjdk.org/jdk/pull/14491#discussion_r1232481065