RFC 2292 Advanced Sockets API for IPv6 February 1998
Most applications using an ICMPv6 raw socket care about only a small
subset of the ICMPv6 message types. To transfer extraneous ICMPv6
messages from the kernel to user can incur a significant overhead.
Therefore this API includes a method of filtering ICMPv6 messages by
the ICMPv6 type field.
Each ICMPv6 raw socket has an associated filter whose datatype is
defined as
struct icmp6_filter;
This structure, along with the macros and constants defined later in
this section,
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