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Route destinations like 10/8 are most likely intended as a shorthand
for 10.0.0.0/8, but instead it means 0.0.0.10/8, which includes
only bits in the host part of the mask, and hence adds a route to
0.0.0.0/8. In 12.x, there was code to "do what I mean", which was
removed as part of a cleanup of old network class remnants. Given
that we have gone this long without that code, do not restore that
behavior. Instead, detect the issue and produce an error.
Specifically, if there are no dots in a numeric IPv4 address, the
mask is specified with CIDR notation (using a slash), and there are
bits set in the host part, produce an error like this for 10/8:
route: malformed address, bits set after mask; 10 means 0.0.0.10
PR: 258874
Reviewed by: melifaro, emaste
Differential Revision: https://reviews.freebsd.org/D43384
(cherry picked from commit
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