1 /* 2 * Copyright (c) 2009 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Sepherosa Ziehau <sepherosa@gmail.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #ifndef _NET_TOEPLITZ2_H_ 36 #define _NET_TOEPLITZ2_H_ 37 38 #ifndef _KERNEL 39 #error "kernel only header file" 40 #endif 41 42 #define TOEPLITZ_KEYSEED_CNT 2 43 44 extern uint32_t toeplitz_cache[TOEPLITZ_KEYSEED_CNT][256]; 45 46 static __inline uint32_t 47 toeplitz_rawhash_addrport(in_addr_t _faddr, in_addr_t _laddr, 48 in_port_t _fport, in_port_t _lport) 49 { 50 uint32_t _res; 51 52 _res = toeplitz_cache[0][_faddr & 0xff]; 53 _res ^= toeplitz_cache[0][(_faddr >> 16) & 0xff]; 54 _res ^= toeplitz_cache[0][_laddr & 0xff]; 55 _res ^= toeplitz_cache[0][(_laddr >> 16) & 0xff]; 56 _res ^= toeplitz_cache[0][_fport & 0xff]; 57 _res ^= toeplitz_cache[0][_lport & 0xff]; 58 59 _res ^= toeplitz_cache[1][(_faddr >> 8) & 0xff]; 60 _res ^= toeplitz_cache[1][(_faddr >> 24) & 0xff]; 61 _res ^= toeplitz_cache[1][(_laddr >> 8) & 0xff]; 62 _res ^= toeplitz_cache[1][(_laddr >> 24) & 0xff]; 63 _res ^= toeplitz_cache[1][(_fport >> 8) & 0xff]; 64 _res ^= toeplitz_cache[1][(_lport >> 8) & 0xff]; 65 66 return _res; 67 } 68 69 static __inline uint32_t 70 toeplitz_rawhash_addr(in_addr_t _faddr, in_addr_t _laddr) 71 { 72 uint32_t _res; 73 74 _res = toeplitz_cache[0][_faddr & 0xff]; 75 _res ^= toeplitz_cache[0][(_faddr >> 16) & 0xff]; 76 _res ^= toeplitz_cache[0][_laddr & 0xff]; 77 _res ^= toeplitz_cache[0][(_laddr >> 16) & 0xff]; 78 79 _res ^= toeplitz_cache[1][(_faddr >> 8) & 0xff]; 80 _res ^= toeplitz_cache[1][(_faddr >> 24) & 0xff]; 81 _res ^= toeplitz_cache[1][(_laddr >> 8) & 0xff]; 82 _res ^= toeplitz_cache[1][(_laddr >> 24) & 0xff]; 83 84 return _res; 85 } 86 87 static __inline int 88 toeplitz_hash(uint32_t _rawhash) 89 { 90 return (_rawhash & 0xffff); 91 } 92 93 static __inline uint32_t 94 toeplitz_piecemeal_addr(in_addr_t _faddr) 95 { 96 uint32_t _res; 97 98 _res = toeplitz_cache[0][_faddr & 0xff]; 99 _res ^= toeplitz_cache[0][(_faddr >> 16) & 0xff]; 100 _res ^= toeplitz_cache[1][(_faddr >> 8) & 0xff]; 101 _res ^= toeplitz_cache[1][(_faddr >> 24) & 0xff]; 102 return _res; 103 } 104 105 static __inline uint32_t 106 toeplitz_piecemeal_port(in_port_t _fport) 107 { 108 uint32_t _res; 109 110 _res = toeplitz_cache[0][_fport & 0xff]; 111 _res ^= toeplitz_cache[1][(_fport >> 8) & 0xff]; 112 113 return _res; 114 } 115 116 #endif /* !_NET_TOEPLITZ2_H_ */ 117