| 1 | /* |
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| 2 | * |
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| 3 | * Copyright (c) 2007-2016 The University of Waikato, Hamilton, New Zealand. |
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| 4 | * All rights reserved. |
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| 5 | * |
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| 6 | * This file is part of libtrace. |
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| 7 | * |
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| 8 | * This code has been developed by the University of Waikato WAND |
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| 9 | * research group. For further information please see http://www.wand.net.nz/ |
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| 10 | * |
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| 11 | * libtrace is free software; you can redistribute it and/or modify |
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| 12 | * it under the terms of the GNU Lesser General Public License as published by |
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| 13 | * the Free Software Foundation; either version 3 of the License, or |
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| 14 | * (at your option) any later version. |
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| 15 | * |
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| 16 | * libtrace is distributed in the hope that it will be useful, |
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| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 19 | * GNU Lesser General Public License for more details. |
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| 20 | * |
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| 21 | * You should have received a copy of the GNU Lesser General Public License |
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| 22 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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| 23 | * |
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| 24 | * |
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| 25 | */ |
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| 26 | |
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| 27 | /** |
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| 28 | * toeplitz hashing - see microsoft rss code |
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| 29 | */ |
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| 30 | #include <stdint.h> |
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| 31 | #include <stddef.h> |
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| 32 | #include <libtrace.h> |
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| 33 | |
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| 34 | #ifndef HASH_TOEPLITZ_H |
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| 35 | #define HASH_TOEPLITZ_H |
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| 36 | |
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| 37 | /** |
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| 38 | * The default expected to be used. |
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| 39 | */ |
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| 40 | typedef struct toeplitz_conf { |
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| 41 | unsigned int hash_ipv4 : 1; |
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| 42 | unsigned int hash_tcp_ipv4 : 1; |
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| 43 | unsigned int hash_ipv6 : 1; |
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| 44 | unsigned int hash_tcp_ipv6 : 1; |
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| 45 | unsigned int hash_ipv6_ex : 1; |
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| 46 | unsigned int hash_tcp_ipv6_ex : 1; |
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| 47 | /* These UDP ones are Intel extensions */ |
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| 48 | unsigned int x_hash_udp_ipv4 : 1; |
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| 49 | unsigned int x_hash_udp_ipv6 : 1; |
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| 50 | unsigned int x_hash_udp_ipv6_ex : 1; |
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| 51 | uint8_t key[40]; |
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| 52 | uint32_t key_cache[320]; |
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| 53 | } toeplitz_conf_t; |
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| 54 | |
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| 55 | void toeplitz_hash_expand_key(toeplitz_conf_t *conf); |
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| 56 | uint32_t toeplitz_hash(const toeplitz_conf_t *tc, const uint8_t *data, size_t offset, size_t n, uint32_t result); |
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| 57 | uint32_t toeplitz_first_hash(const toeplitz_conf_t *tc, const uint8_t *data, size_t n); |
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| 58 | void toeplitz_init_config(toeplitz_conf_t *conf, bool bidirectional); |
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| 59 | uint64_t toeplitz_hash_packet(const libtrace_packet_t * pkt, const toeplitz_conf_t *cnf); |
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| 60 | void toeplitz_create_bikey(uint8_t *key); |
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| 61 | void toeplitz_create_unikey(uint8_t *key); |
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| 62 | |
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| 63 | |
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| 64 | /* IPv4 Only (Input[8] = @12-15, @16-19) src dst */ |
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| 65 | |
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| 66 | // Using char any way in the hope this structure will auto allign |
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| 67 | #pragma pack(push) /* push current alignment to stack */ |
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| 68 | #pragma pack(1) /* set alignment to 1 byte boundary */ |
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| 69 | typedef struct ipv4_toeplitz_only { |
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| 70 | uint8_t src[4]; |
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| 71 | uint8_t dest[4]; |
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| 72 | } toeplitz_ipv4_only_t; |
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| 73 | #pragma pack(pop) /* restore original alignment from stack */ |
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| 74 | |
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| 75 | #endif |
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