October, finally. “Only" 1 month of backlog in new features in 8.5, but I'm getting there 🙂
So, on 1st of October Tom Lane committed patch by Stef Walter:
Log Message: ----------- Support "samehost" and "samenet" specifications in pg_hba.conf, by enumerating the machine's IP interfaces to look for a match. Stef Walter
For some reason I cannot find it in mailing list archive, but luckily have copy of email (without all headers unfortunately).