b1a597e0c3
Prefix sets were broken beyond any repair and have to be reimplemented. They are reimplemented using a trie with bitmasks in nodes. There is also change in the interpretation of minus prefix pattern, but the old interpretation was already inconsistent with the documentation and broken. There is also some bugfixes in filter code related to set variables.
94 lines
2 KiB
C
94 lines
2 KiB
C
/*
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* BIRD -- IP Addresses et Cetera for IPv4
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*
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* (c) 1998--1999 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 "lib/endian.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 MAX_PREFIX_LENGTH 32
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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 SIZE_OF_IP_HEADER 24
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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,len) _MI(_I(x) ^ (len == 30 ? 3 : 1))
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#define ipa_class_mask(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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#define ipa_compare(x,y) ipv4_compare(_I(x),_I(y))
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/* ipa_pxlen() requires that x != y */
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#define ipa_pxlen(x, y) ipv4_pxlen(_I(x), _I(y))
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#define ipa_getbit(x, y) (_I(x) & (0x80000000 >> (y)))
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#define ip_skip_header(x, y) ipv4_skip_header(x, y)
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int ipv4_classify(u32);
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u32 ipv4_class_mask(u32);
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byte *ipv4_skip_header(byte *, int *);
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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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static inline int ipv4_compare(u32 x, u32 y)
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{
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return (x > y) - (x < y);
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}
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static inline u32 ipv4_pxlen(u32 a, u32 b)
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{
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return 31 - u32_log2(a ^ b);
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}
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#define IP_PREC_INTERNET_CONTROL 0xc0
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#endif
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