59 lines
2 KiB
C
59 lines
2 KiB
C
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/*
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* Copyright (c) 2011 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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#ifndef _NET_FLOWHASH_H_
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#define _NET_FLOWHASH_H_
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#include <sys/types.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* If 32-bit hash value is too large, use this macro to truncate
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* it to n-bit; masking is a faster operation than modulus.
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*/
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#define HASHMASK(n) ((1UL << (n)) - 1)
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/*
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* Returns 32-bit hash value. Hashes which are capable of returning
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* more bits currently have their results truncated to 32-bit.
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*/
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typedef u_int32_t net_flowhash_fn_t(const void *, u_int32_t, const u_int32_t);
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extern net_flowhash_fn_t *net_flowhash;
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extern net_flowhash_fn_t net_flowhash_mh3_x86_32;
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extern net_flowhash_fn_t net_flowhash_mh3_x64_128;
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extern net_flowhash_fn_t net_flowhash_jhash;
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#ifdef __cplusplus
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}
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#endif
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#endif /* _NET_FLOWHASH_H_ */
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