144 lines
4.2 KiB
C
144 lines
4.2 KiB
C
/* $OpenBSD: toeplitz.h,v 1.11 2023/05/17 10:22:17 dlg Exp $ */
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/*
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* Copyright (c) 2019 David Gwynne <dlg@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _SYS_NET_TOEPLITZ_H_
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#define _SYS_NET_TOEPLITZ_H_
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#include <sys/endian.h>
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/*
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* symmetric toeplitz
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*/
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typedef uint16_t stoeplitz_key;
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struct stoeplitz_cache {
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uint16_t bytes[256];
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};
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static __unused inline uint16_t
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stoeplitz_cache_entry(const struct stoeplitz_cache *scache, uint8_t byte)
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{
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return (scache->bytes[byte]);
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}
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void stoeplitz_cache_init(struct stoeplitz_cache *, stoeplitz_key);
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uint16_t stoeplitz_hash_ip4(const struct stoeplitz_cache *,
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uint32_t, uint32_t);
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uint16_t stoeplitz_hash_ip4port(const struct stoeplitz_cache *,
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uint32_t, uint32_t, uint16_t, uint16_t);
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#ifdef INET6
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struct in6_addr;
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uint16_t stoeplitz_hash_ip6(const struct stoeplitz_cache *,
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const struct in6_addr *, const struct in6_addr *);
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uint16_t stoeplitz_hash_ip6port(const struct stoeplitz_cache *,
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const struct in6_addr *, const struct in6_addr *,
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uint16_t, uint16_t);
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#endif
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uint16_t stoeplitz_hash_eaddr(const struct stoeplitz_cache *,
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const uint8_t *);
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/* hash a uint16_t in network byte order */
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static __unused inline uint16_t
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stoeplitz_hash_n16(const struct stoeplitz_cache *scache, uint16_t n16)
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{
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uint16_t hi, lo;
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hi = stoeplitz_cache_entry(scache, n16 >> 8);
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lo = stoeplitz_cache_entry(scache, n16);
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return (hi ^ swap16(lo));
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}
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/* hash a uint32_t in network byte order */
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static __unused inline uint16_t
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stoeplitz_hash_n32(const struct stoeplitz_cache *scache, uint32_t n32)
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{
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return (stoeplitz_hash_n16(scache, n32 ^ (n32 >> 16)));
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}
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/* hash a uint16_t in host byte order */
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static __unused inline uint16_t
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stoeplitz_hash_h16(const struct stoeplitz_cache *scache, uint16_t h16)
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{
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uint16_t lo, hi;
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lo = stoeplitz_cache_entry(scache, h16);
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hi = stoeplitz_cache_entry(scache, h16 >> 8);
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#if _BYTE_ORDER == _BIG_ENDIAN
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return (hi ^ swap16(lo));
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#else
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return (swap16(hi) ^ lo);
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#endif
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}
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static __unused inline uint16_t
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stoeplitz_hash_h32(const struct stoeplitz_cache *scache, uint32_t h32)
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{
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return (stoeplitz_hash_h16(scache, h32 ^ (h32 >> 16)));
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}
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static __unused inline uint16_t
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stoeplitz_hash_h64(const struct stoeplitz_cache *scache, uint64_t h64)
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{
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return (stoeplitz_hash_h32(scache, h64 ^ (h64 >> 32)));
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}
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/*
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* system provided symmetric toeplitz
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*/
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#define STOEPLITZ_KEYSEED 0x6d5a
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void stoeplitz_init(void);
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void stoeplitz_to_key(void *, size_t)
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__bounded((__buffer__, 1, 2));
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extern const struct stoeplitz_cache *const stoeplitz_cache;
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#define stoeplitz_n16(_n16) \
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stoeplitz_hash_n16(stoeplitz_cache, (_n16))
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#define stoeplitz_n32(_n32) \
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stoeplitz_hash_n32(stoeplitz_cache, (_n32))
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#define stoeplitz_h16(_h16) \
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stoeplitz_hash_h16(stoeplitz_cache, (_h16))
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#define stoeplitz_h32(_h32) \
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stoeplitz_hash_h32(stoeplitz_cache, (_h32))
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#define stoeplitz_h64(_h64) \
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stoeplitz_hash_h64(stoeplitz_cache, (_h64))
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#define stoeplitz_port(_p) stoeplitz_n16((_p))
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#define stoeplitz_ip4(_sa4, _da4) \
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stoeplitz_hash_ip4(stoeplitz_cache, (_sa4), (_da4))
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#define stoeplitz_ip4port(_sa4, _da4, _sp, _dp) \
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stoeplitz_hash_ip4port(stoeplitz_cache, (_sa4), (_da4), (_sp), (_dp))
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#ifdef INET6
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#define stoeplitz_ip6(_sa6, _da6) \
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stoeplitz_hash_ip6(stoeplitz_cache, (_sa6), (_da6))
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#define stoeplitz_ip6port(_sa6, _da6, _sp, _dp) \
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stoeplitz_hash_ip6port(stoeplitz_cache, (_sa6), (_da6), (_sp), (_dp))
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#endif
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#define stoeplitz_eaddr(_ea) \
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stoeplitz_hash_eaddr(stoeplitz_cache, (_ea))
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#endif /* _SYS_NET_TOEPLITZ_H_ */
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