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a9a87c1921
Hide historical Class A/B/C macros unless IN_HISTORICAL_NETS is defined; define it for user level. Define IN_MULTICAST separately from IN_CLASSD, and use it in pf instead of IN_CLASSD. Stop using class for setting default masks when not specified; instead, define new default mask (24 bits). Warn when an Internet address is set without a mask. MFC after: 1 month Reviewed by: cy Differential Revision: https://reviews.freebsd.org/D32708