[Bug 275265] When net.inet6.icmp6.nodeinfo=0 interfaces should not join NI multicast groups

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275265

            Bug ID: 275265
           Summary: When net.inet6.icmp6.nodeinfo=0 interfaces should not
                    join NI multicast groups
           Product: Base System
           Version: 14.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: sean@donelan.com

Created attachment 246500
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=246500&action=edit
patch

Incomplete bugfix 257709 - netinet6: Set net.inet6.icmp6.nodeinfo default to 0

When sysctl net.inet6.icmp6.nodeinfo=0, sys/netinet6/in6.6
(in6_update_ifa_join_mc) should not join experimental Node Information
multicast groups (ff02::2:XXX and ff02::2:ffXX) or increase startup delay.

% sysctl net.inet6.icmp6.nodeinfo
net.inet6.icmp6.nodeinfo: 0
% ifmcstat
bge0:
        inet6 [...redacted..]%bge0 scopeid 0x1
        mldv2 flags=2<USEALLOW> rv 2 qi 125 qri 10 uri 3
                [...redacted...]
                group ff02::2:205f:1f4a%bge0 scopeid 0x1 mode exclude
                        mcast-macaddr 33:33:20:5f:1f:4a
                group ff02::2:ff20:5f1f%bge0 scopeid 0x1 mode exclude
                        mcast-macaddr 33:33:ff:20:5f:1f

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