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
toeplitz_rawhash_addrport(in_addr_t _faddr,in_addr_t _laddr,in_port_t _fport,in_port_t _lport)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
toeplitz_rawhash_addr(in_addr_t _faddr,in_addr_t _laddr)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
toeplitz_hash(uint32_t _rawhash)88 toeplitz_hash(uint32_t _rawhash)
89 {
90 return (_rawhash & 0xffff);
91 }
92
93 static __inline uint32_t
toeplitz_piecemeal_addr(in_addr_t _faddr)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
toeplitz_piecemeal_port(in_port_t _fport)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