1 /* in_cksum.h
2  * Declaration of Internet checksum routine.
3  *
4  * Copyright (c) 1988, 1992, 1993
5  *	The Regents of the University of California.  All rights reserved.
6  *
7  * SPDX-License-Identifier: BSD-3-Clause
8  */
9 
10 #ifndef __IN_CKSUM_H__
11 #define __IN_CKSUM_H__
12 
13 #include "ws_symbol_export.h"
14 
15 typedef struct {
16 	const guint8 *ptr;
17 	int	len;
18 } vec_t;
19 
20 #define SET_CKSUM_VEC_PTR(vecelem, data, length) \
21 	G_STMT_START { \
22 		vecelem.ptr = (data); \
23 		vecelem.len = (length); \
24 	} G_STMT_END
25 
26 #define SET_CKSUM_VEC_TVB(vecelem, tvb, offset, length) \
27 	G_STMT_START { \
28 		vecelem.len = (length); \
29 		vecelem.ptr = tvb_get_ptr((tvb), (offset), vecelem.len); \
30 	} G_STMT_END
31 
32 WS_DLL_PUBLIC guint16 ip_checksum(const guint8 *ptr, int len);
33 
34 WS_DLL_PUBLIC guint16 ip_checksum_tvb(tvbuff_t *tvb, int offset, int len);
35 
36 WS_DLL_PUBLIC int in_cksum(const vec_t *vec, int veclen);
37 
38 guint16 in_cksum_shouldbe(guint16 sum, guint16 computed_sum);
39 
40 #endif /* __IN_CKSUM_H__ */
41