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While 485dbd1fdac9c965c1f734b1dda711b35bb4ac1a (from #12175) was right in assuming that the for most ICMPv6 error messages the originating packet's destination address must not be a multicast, this is not the case for _all_ ICMPv6 error messages (see [RFC 4443], section 2.4(e.3)). Additionally, 485dbd1fdac9c965c1f734b1dda711b35bb4ac1a removed the check for the source address ([RFC 4443], section 2.4(e.6)), which this PR re-adds. [RFC 4443]: https://tools.ietf.org/html/rfc4443#section-2.4