1*a1e26a70SApple OSS Distributions /* 2*a1e26a70SApple OSS Distributions * Copyright (c) 2011 Apple Inc. All rights reserved. 3*a1e26a70SApple OSS Distributions * 4*a1e26a70SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*a1e26a70SApple OSS Distributions * 6*a1e26a70SApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*a1e26a70SApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*a1e26a70SApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*a1e26a70SApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*a1e26a70SApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*a1e26a70SApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*a1e26a70SApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*a1e26a70SApple OSS Distributions * terms of an Apple operating system software license agreement. 14*a1e26a70SApple OSS Distributions * 15*a1e26a70SApple OSS Distributions * Please obtain a copy of the License at 16*a1e26a70SApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*a1e26a70SApple OSS Distributions * 18*a1e26a70SApple OSS Distributions * The Original Code and all software distributed under the License are 19*a1e26a70SApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*a1e26a70SApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*a1e26a70SApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*a1e26a70SApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*a1e26a70SApple OSS Distributions * Please see the License for the specific language governing rights and 24*a1e26a70SApple OSS Distributions * limitations under the License. 25*a1e26a70SApple OSS Distributions * 26*a1e26a70SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*a1e26a70SApple OSS Distributions */ 28*a1e26a70SApple OSS Distributions 29*a1e26a70SApple OSS Distributions #ifndef _NET_FLOWHASH_H_ 30*a1e26a70SApple OSS Distributions #define _NET_FLOWHASH_H_ 31*a1e26a70SApple OSS Distributions 32*a1e26a70SApple OSS Distributions #include <sys/types.h> 33*a1e26a70SApple OSS Distributions 34*a1e26a70SApple OSS Distributions #ifdef __cplusplus 35*a1e26a70SApple OSS Distributions extern "C" { 36*a1e26a70SApple OSS Distributions #endif 37*a1e26a70SApple OSS Distributions 38*a1e26a70SApple OSS Distributions /* 39*a1e26a70SApple OSS Distributions * If 32-bit hash value is too large, use this macro to truncate 40*a1e26a70SApple OSS Distributions * it to n-bit; masking is a faster operation than modulus. 41*a1e26a70SApple OSS Distributions */ 42*a1e26a70SApple OSS Distributions #define HASHMASK(n) ((1UL << (n)) - 1) 43*a1e26a70SApple OSS Distributions 44*a1e26a70SApple OSS Distributions /* 45*a1e26a70SApple OSS Distributions * Returns 32-bit hash value. Hashes which are capable of returning 46*a1e26a70SApple OSS Distributions * more bits currently have their results truncated to 32-bit. 47*a1e26a70SApple OSS Distributions */ 48*a1e26a70SApple OSS Distributions typedef u_int32_t net_flowhash_fn_t(const void *__sized_by(len) key, u_int32_t len, const u_int32_t); 49*a1e26a70SApple OSS Distributions 50*a1e26a70SApple OSS Distributions extern net_flowhash_fn_t *net_flowhash; 51*a1e26a70SApple OSS Distributions extern net_flowhash_fn_t net_flowhash_mh3_x86_32; 52*a1e26a70SApple OSS Distributions extern net_flowhash_fn_t net_flowhash_mh3_x64_128; 53*a1e26a70SApple OSS Distributions extern net_flowhash_fn_t net_flowhash_jhash; 54*a1e26a70SApple OSS Distributions #ifdef __cplusplus 55*a1e26a70SApple OSS Distributions } 56*a1e26a70SApple OSS Distributions #endif 57*a1e26a70SApple OSS Distributions 58*a1e26a70SApple OSS Distributions #endif /* _NET_FLOWHASH_H_ */ 59