netdev - socketoption IPV6_MULTICAST

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Message-ID: <ab2cc07a-3b66-a47b-402d-1b29c0d9d384@gmail.com>
Date:   Fri, 20 Apr 2018 09:02:23 +0200
From:   Andre Naujoks <nautsch2@...il.com>
To:     netdev@...r.kernel.org
Subject: socketoption IPV6_MULTICAST_LOOP Bug?

Hi all.

It seems the documentation (i.e. 'man ipv6') and the actual
behavior of the kernel diverge somehow in regard to what
IPV6_MULTICAST_LOOP does.

The manpage says:
---
IPV6_MULTICAST_LOOP
       Control whether the socket sees multicast packets that it has send itself.  Argument is a pointer to boolean.
---

However, the actual behavior on my system is, that the whole system
no longer receives multicast packets sent from that socket. As opposed
to only the socket itself no longer seeing its own packets.

Is this a bug, or is the documentation wrong? I sincerely hope this is a bug,
since everything else does not make sense at all in a multiuser system.

Regards
Andre