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a6f250f5c6
version has not been benchmarked yet due to insufficient test data.) Now ipa_hash() returns a uniformely distributed 16-bit value.
73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
/*
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* BIRD -- IP Addresses et Cetera for IPv4
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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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#ifndef _BIRD_IPV4_H_
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#define _BIRD_IPV4_H_
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#include <netinet/in.h>
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#include "lib/bitops.h"
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#ifdef DEBUGGING
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/*
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* Use the structural representation when you want to make sure
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* nobody unauthorized attempts to handle ip_addr as number.
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*/
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typedef struct ipv4_addr {
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u32 addr;
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} ip_addr;
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#define _I(x) (x).addr
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#define _MI(x) ((struct ipv4_addr) { x })
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#else
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typedef u32 ip_addr;
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#define _I(x) (x)
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#define _MI(x) (x)
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#endif
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#define BITS_PER_IP_ADDRESS 32
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#define STD_ADDRESS_P_LENGTH 15
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#define IPA_NONE (_MI(0))
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#define ipa_equal(x,y) (_I(x) == _I(y))
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#define ipa_nonzero(x) _I(x)
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#define ipa_and(x,y) _MI(_I(x) & _I(y))
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#define ipa_or(x,y) _MI(_I(x) | _I(y))
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#define ipa_xor(x,y) _MI(_I(x) ^ _I(y))
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#define ipa_not(x) _MI(~_I(x))
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#define ipa_mkmask(x) _MI(u32_mkmask(x))
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#define ipa_mklen(x) u32_masklen(_I(x))
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#define ipa_hash(x) ipv4_hash(_I(x))
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#define ipa_hton(x) x = _MI(htonl(_I(x)))
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#define ipa_ntoh(x) x = _MI(ntohl(_I(x)))
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#define ipa_classify(x) ipv4_classify(_I(x))
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#define ipa_opposite(x) _MI(_I(x) ^ 1)
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#define ipa_class_mask(x) x = _MI(ipv4_class_mask(_I(x)))
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#define ipa_from_u32(x) _MI(x)
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#define ipa_to_u32(x) _I(x)
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int ipv4_classify(u32);
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u32 ipv4_class_mask(u32);
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static inline unsigned ipv4_hash(u32 a)
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{
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/* Returns a 16-bit value */
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a ^= a >> 16;
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a ^= a << 10;
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return a & 0xffff;
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}
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#endif
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