quoted

Yea, I wanted to get all the rpc_pton/rpc_ntop (which handle both
ipv4 and ipv6 with scopes) converted to use a common helper.

RPC is dealing with universal addresses, which are not quite the
same as IP presentation addresses. The port number is expressed
as:

  hi8.lo8

I noticed that, that's why there will be some processing in
sunrpc to construct a port string to a generic helper (if it chooses to
use it).

And universal IPv6 addresses don't have a mechanism for conveying
scope information.

I do see scope handling in rpc_pton6 code if provided...