Implement RFC3442, the Classless Static Route option.
The original DHCP specification includes a route option but it supports only class-based routes. RFC3442 adds support for specifying the netmask width for each static route. A variable length encoding is used to minimize the size of this option.
PR: bin/99534 Submitted by: Andrey V. Elsukov <bu7cher@yandex.ru> Reviewed by: brooks
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