[Kea-users] Option 125 (VIVSO) with csv-format: false drops sub-option payload

[Alexis]

 Hi,

I'm running Kea on OPNsense and I've found that option 125 (VIVSO) does not
behave as expected when configured with csv-format: false and raw hex data.

When I send the full VIVSO payload as raw hex:

"option-data": [
  { "code": 125, "csv-format": false, "always-send": true, "data":
"00000DE924..." }
]

Kea only sends 5 bytes on the wire (confirmed via tcpdump):

  Unknown (125), length 5: 0.0.13.233.0

Only the enterprise number (3561) + an empty byte. The sub-option TLV
payload is dropped.

However, when using the option-def + vivso-suboptions + vendor space
framework with the exact same data:

"option-def": [
  { "name": "vc-opt4", "code": 4, "type": "binary", "space": "vendor-3561"
},
  { "name": "vc-opt5", "code": 5, "type": "binary", "space": "vendor-3561"
},
  { "name": "vc-opt6", "code": 6, "type": "binary", "space": "vendor-3561" }
],
"option-data": [
  { "name": "vivso-suboptions", "always-send": true, "data": "3561" },
  { "name": "vc-opt4", "space": "vendor-3561", "always-send": true,
"csv-format": false, "data": "..." },
  { "name": "vc-opt5", "space": "vendor-3561", "always-send": true,
"csv-format": false, "data": "..." },
  { "name": "vc-opt6", "space": "vendor-3561", "always-send": true,
"csv-format": false, "data": "..." }
]

The full 41-byte option 125 is correctly sent on the wire with all
sub-options.

It appears that Kea treats option 125 specially because it is internally
defined as vivso-suboptions (type uint32). Even with csv-format: false, Kea
parses the enterprise number and discards the remaining data instead of
treating it as an opaque binary blob.

My expectation would be that csv-format: false sends raw bytes unchanged,
regardless of the option code.

Is this the intended behavior or a bug?

Use case: French ISP (Orange) FTTH requires VIVSO with enterprise 3561 and
vendor sub-options for TV decoder authentication.

Related OPNsense issue: https://github.com/opnsense/core/issues/10060

Kea version: as shipped with OPNsense 26.1 (FreeBSD)

Thanks
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.isc.org/pipermail/kea-users/attachments/20260330/2d11e96c/attachment.htm>