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(-)

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2.54.0