Following the current changes, future work will involve adding support for
options 138 and 139. I have not included these in this patch series because
the parsing for both requires significant code changes, which I believe
would be too much to review at once.

Regards,
Anshu

On Thu, Jun 4, 2026 at 4:22 PM Anshu Kumari <anskuma@redhat.com> wrote:

> This series adds a --dhcpv6-opt CODE,VALUE command-line option to
> inject custom options into DHCPv6 replies, complementing the existing
> --dhcp-opt support for DHCPv4.
>
> The primary use case is UEFI HTTP Boot, which requires Vendor Class
> (option 16) with the correct enterprise-number + length-prefixed wire
> encoding per RFC 8415 Section 21.16, and Boot File URL (option 59).
>
> Value formats are determined automatically from the option code via a
> type table. Supported types include plain strings, IPv6
> addresses (single and list), 8/16/32-bit integers, vendor class
> (ENTERPRISE:DATA), and length-prefixed string lists.
>
> Patch 1 adds the CLI flag, storage, and basic man page entry.
> Patch 2 adds the type table and binary parser for all supported types.
> Patch 3 injects the parsed options into DHCPv6 reply packets.
>
> Anshu Kumari (3):
>   conf: Add --dhcpv6-opt command-line option
>   dhcpv6: Add option type table and value parser
>   dhcpv6: Inject custom options into DHCPv6 replies
>
>  conf.c   |  26 ++++-
>  dhcpv6.c | 295 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  dhcpv6.h |   1 +
>  passt.1  |  30 ++++++
>  passt.h  |  16 +++
>  5 files changed, 367 insertions(+), 1 deletion(-)
>
> --
> 2.54.0
>
>