Fix/dhcpv6 fixups#5759

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ethan-thompson wants to merge 9 commits intoFreeRADIUS:masterfrom

ethan-thompson:fix/dhcpv6-fixups

Commits on Mar 4, 2026

As per RFC 9915 the server MUST discoard any Solicit, Confirm, or Rebind messages that include a Server Identifier option.
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RFC 9915 Section 16.12 says the server MUST discard any received Information-request messages IF the message includes a Server Identifier option AND the DUID in the option does not match the server…
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If vp is not appended to tmp, it is not freed with tmp (as expected). Instead, explicitly free vp before going to fail.
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We added support for dhcpv6 lease query and lease query reply. We need to not reject them.
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Validate DHCPv6 reconfigure message option has a valid message type
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Decoding from network to host should use ntohl().
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Update comment to use the correct number of hex digits for a 32-bit integer.
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make dhcpv6 global init/free thread-safe
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fix corruption of existing VSA group on decode failure
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