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30 lines
569 B
C
30 lines
569 B
C
/*
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* BIRD Library -- IPv4 Address Manipulation Functions
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*
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* (c) 1998 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#include "nest/bird.h"
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#include "lib/ip.h"
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int
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ipv4_classify(u32 a)
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{
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u32 b = a >> 24U;
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if (b && b <= 0xdf)
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{
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if (b == 0x7f)
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return IADDR_HOST | SCOPE_HOST;
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else
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return IADDR_HOST | SCOPE_UNIVERSE;
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}
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if (b >= 0xe0 && b <= 0xef)
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return IADDR_MULTICAST | SCOPE_UNIVERSE;
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if (a == 0xffffffff)
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return IADDR_BROADCAST | SCOPE_LINK;
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return IADDR_INVALID;
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}
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