This version of MPDCCP only defines one HMAC based on SHA-256. If SHA256
gets deprecated for any reason, would this require a new version of MPDCCP ?
I would suggest to add some pseudocode to clarify how the data from the
options is processed. Please also indicate that you use the network
order representation of the addresses
Olivier's comment in https://mailarchive.ietf.org/arch/msg/tsvwg/T-9P8iVoU5i89VK9QJXnOG_IsL4/