[Bug 231143] Ipfw fwd with route(8) RTF_BLACKHOLE and fast forwarding on FreeBSD 11

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231143

            Bug ID: 231143
           Summary: Ipfw fwd with route(8) RTF_BLACKHOLE and fast
                    forwarding on FreeBSD 11
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: run00er at gmail.com

A situation has arisen in which ipfw fwd stops working when 
RTF_BLACKHOLE or RTF_REJECT, ROUTE (8), is enabled on 
Freebsd 11 release.

 FreeBSD 11.2-RELEASE-p1
route add default 127.0.0.1 -blackhole –iface
ipfw show
00100 30 4056 fwd 10.0.0.5 ip from table(1) to not 10.0.0.0/8 in via em0

 The packet counter changes, but forwarding does not work.
On FreeBSD 10 everything works fine.

 I suppose this is due to changes to forwarding -> fast forwarding by 
default in FreeBSD 11 and man ROUTE (8), “BUGS - unless IP fast forwarding is
enabled, in which case the meaning of the flag will always be honored.”

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