1*f6217f89SApple OSS Distributions /* 2*f6217f89SApple OSS Distributions * Copyright (c) 2011 Apple Inc. All rights reserved. 3*f6217f89SApple OSS Distributions * 4*f6217f89SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*f6217f89SApple OSS Distributions * 6*f6217f89SApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*f6217f89SApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*f6217f89SApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*f6217f89SApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*f6217f89SApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*f6217f89SApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*f6217f89SApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*f6217f89SApple OSS Distributions * terms of an Apple operating system software license agreement. 14*f6217f89SApple OSS Distributions * 15*f6217f89SApple OSS Distributions * Please obtain a copy of the License at 16*f6217f89SApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*f6217f89SApple OSS Distributions * 18*f6217f89SApple OSS Distributions * The Original Code and all software distributed under the License are 19*f6217f89SApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*f6217f89SApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*f6217f89SApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*f6217f89SApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*f6217f89SApple OSS Distributions * Please see the License for the specific language governing rights and 24*f6217f89SApple OSS Distributions * limitations under the License. 25*f6217f89SApple OSS Distributions * 26*f6217f89SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*f6217f89SApple OSS Distributions */ 28*f6217f89SApple OSS Distributions 29*f6217f89SApple OSS Distributions #ifndef _NET_FLOWHASH_H_ 30*f6217f89SApple OSS Distributions #define _NET_FLOWHASH_H_ 31*f6217f89SApple OSS Distributions 32*f6217f89SApple OSS Distributions #include <sys/types.h> 33*f6217f89SApple OSS Distributions 34*f6217f89SApple OSS Distributions #ifdef __cplusplus 35*f6217f89SApple OSS Distributions extern "C" { 36*f6217f89SApple OSS Distributions #endif 37*f6217f89SApple OSS Distributions 38*f6217f89SApple OSS Distributions /* 39*f6217f89SApple OSS Distributions * If 32-bit hash value is too large, use this macro to truncate 40*f6217f89SApple OSS Distributions * it to n-bit; masking is a faster operation than modulus. 41*f6217f89SApple OSS Distributions */ 42*f6217f89SApple OSS Distributions #define HASHMASK(n) ((1UL << (n)) - 1) 43*f6217f89SApple OSS Distributions 44*f6217f89SApple OSS Distributions /* 45*f6217f89SApple OSS Distributions * Returns 32-bit hash value. Hashes which are capable of returning 46*f6217f89SApple OSS Distributions * more bits currently have their results truncated to 32-bit. 47*f6217f89SApple OSS Distributions */ 48*f6217f89SApple 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*f6217f89SApple OSS Distributions 50*f6217f89SApple OSS Distributions extern net_flowhash_fn_t *net_flowhash; 51*f6217f89SApple OSS Distributions extern net_flowhash_fn_t net_flowhash_mh3_x86_32; 52*f6217f89SApple OSS Distributions extern net_flowhash_fn_t net_flowhash_mh3_x64_128; 53*f6217f89SApple OSS Distributions extern net_flowhash_fn_t net_flowhash_jhash; 54*f6217f89SApple OSS Distributions #ifdef __cplusplus 55*f6217f89SApple OSS Distributions } 56*f6217f89SApple OSS Distributions #endif 57*f6217f89SApple OSS Distributions 58*f6217f89SApple OSS Distributions #endif /* _NET_FLOWHASH_H_ */ 59