lib/56821: RT_ADVANCE() vs RT_ROUNDUP()

[andrew.cagney%gmail.com@localhost]

>Number:         56821
>Category:       lib
>Synopsis:       RT_ADVANCE() vs RT_ROUNDUP()
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    lib-bug-people
>State:          open
>Class:          doc-bug
>Submitter-Id:   net
>Arrival-Date:   Sat May 07 13:15:00 +0000 2022
>Originator:     Andrew
>Release:        NetBSD 9
>Organization:
>Environment:
NetBSD arm64 9.2_STABLE NetBSD 9.2_STABLE (GENERIC64) #0: Sun Jun 13 09:44:30 EDT 2021
>Description:
route(8) uses the macros RT_ADVANCE() and RT_ROUNDUP() but they (and the need to align) aren't documented in route(4).

Oh, and:

FreeBSD defines the undocumented SO_SIZE().
OpenBSD hides ADVANCE() and ROUNDUP() in route.c

Sigh
>How-To-Repeat:

>Fix: