[Bug 194485] New: Userland cannot add IPv6 prefix routes

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194485

            Bug ID: 194485
           Summary: Userland cannot add IPv6 prefix routes
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: roy at marples.name

Created attachment 148500
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=148500&action=edit
Allow userland to submit IPv6 prefix routes

Userland cannot add IPv6 prefix routes because the kernel assumes it will
always be the one handling prefix routes from Router Advertisements.

Both NetBSD and OpenBSD have added checks to allow for neighbors on routes
marked RTF_CLONING, but FreeBSD dropped this routing flag a while ago. As such,
the only similar check that can be made is against the absence of RTF_STATIC.
Attached is a patch that implements this and allows dhcpcd-6.5.1 to work
entirely on FreeBSD.

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