1/*
2 ** Copyright (c) 2015, Asim Jamshed, Robin Sommer, Seth Hall
3 ** and the International Computer Science Institute. All rights reserved.
4 **
5 ** Redistribution and use in source and binary forms, with or without
6 ** modification, are permitted provided that the following conditions are met:
7 **
8 ** (1) Redistributions of source code must retain the above copyright
9 **     notice, this list of conditions and the following disclaimer.
10 **
11 ** (2) Redistributions in binary form must reproduce the above copyright
12 **     notice, this list of conditions and the following disclaimer in the
13 **     documentation and/or other materials provided with the distribution.
14 **
15 **
16 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 ** AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 ** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 ** ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
20 ** LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 ** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 ** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 ** INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 ** CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 ** ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 ** POSSIBILITY OF SUCH DAMAGE.
27 **/
28#ifndef LB_PKT_HASH_H
29#define LB_PKT_HASH_H
30/*---------------------------------------------------------------------*/
31/**
32 ** Packet header hashing function utility - This file contains functions
33 ** that parse the packet headers and computes hash functions based on
34 ** the header fields. Please see pkt_hash.c for more details...
35 **/
36/*---------------------------------------------------------------------*/
37/* for type def'n */
38#include <stdint.h>
39/*---------------------------------------------------------------------*/
40#ifdef __GNUC__
41#define likely(x)       __builtin_expect(!!(x), 1)
42#define unlikely(x)     __builtin_expect(!!(x), 0)
43#else
44#define likely(x)       (x)
45#define unlikely(x)     (x)
46#endif
47
48#define HTONS(n) (((((unsigned short)(n) & 0xFF)) << 8) | \
49		  (((unsigned short)(n) & 0xFF00) >> 8))
50#define NTOHS(n) (((((unsigned short)(n) & 0xFF)) << 8) | \
51		  (((unsigned short)(n) & 0xFF00) >> 8))
52
53#define HTONL(n) (((((unsigned long)(n) & 0xFF)) << 24) | \
54        ((((unsigned long)(n) & 0xFF00)) << 8) | \
55        ((((unsigned long)(n) & 0xFF0000)) >> 8) | \
56		  ((((unsigned long)(n) & 0xFF000000)) >> 24))
57
58#define NTOHL(n) (((((unsigned long)(n) & 0xFF)) << 24) | \
59        ((((unsigned long)(n) & 0xFF00)) << 8) | \
60        ((((unsigned long)(n) & 0xFF0000)) >> 8) | \
61		  ((((unsigned long)(n) & 0xFF000000)) >> 24))
62/*---------------------------------------------------------------------*/
63typedef struct vlanhdr {
64	uint16_t pri_cfi_vlan;
65	uint16_t proto;
66} vlanhdr;
67/*---------------------------------------------------------------------*/
68/**
69 ** Analyzes the packet header of computes a corresponding
70 ** hash function.
71 **/
72uint32_t
73pkt_hdr_hash(const unsigned char *buffer,
74	     uint8_t hash_split,
75	     uint8_t seed);
76/*---------------------------------------------------------------------*/
77#endif /* LB_PKT_HASH_H */
78
79