[Bug 258874] route add -inet 240/4 results in 0.0.0.0/4 127.0.0.1 UGRS lo0

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258874

--- Comment #5 from Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> ---
(In reply to Mike Karels from comment #4)
I was expecting the same result (0.0.0.0.0/4, 240 == 0.0.0.240 != 240.0.0.0),
but I have checked and it came out that for FreeBSD 12 and earlier 240 is
240.0.0.0

Test:
route add -net 240/32 localhost -blackhole 
netstat -4rn |grep 240

FreeBSD 12.2 and earlier:
240.0.0.0/32       127.0.0.1          UGSB        lo0

FreeBSD 13.0 and later:
0.0.0.240          127.0.0.1          UGHSB       lo0

Linux and FreeBSD 13.0 network stack work the same in this case and IMHO as
expected. Was the old behavior introduced due to any reasons or was it a bug?

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