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| 1 | .TH ONEC_SUM 3
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| 2 | .SH NAME
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| 3 | oneC_sum \- One's complement internet checksum
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| 4 | .SH SYNOPSIS
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| 5 | .ft B
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| 6 | .nf
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| 7 | #define _MINIX_SOURCE 1
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| 8 | #include <stddef.h>
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| 9 | #include <sys/types.h>
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| 10 |
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| 11 | #include <net/gen/oneCsum.h>
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| 12 |
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| 13 | u16_t oneC_sum(u16_t \fIprev\fP, void *\fIdata\fP, size_t \fIsize\fP)
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| 14 | .fi
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| 15 | .ft R
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| 16 | .SH DESCRIPTION
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| 17 | .B OneC_sum
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| 18 | is used to calculate the one's complement checksum needed for IP network
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| 19 | packets.
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| 20 | A good document about the Internet Checksum is RFC-1071 (Computing the
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| 21 | Internet checksum).
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| 22 | .PP
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| 23 | .B OneC_sum
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| 24 | expects three parameters:
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| 25 | .TP 10
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| 26 | .I prev
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| 27 | The checksum of previous blocks of data that are to be included in the
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| 28 | checksum.
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| 29 | The value of prev in first call to oneC_sum should be 0.
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| 30 | .TP
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| 31 | .I data
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| 32 | A pointer to the block of data.
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| 33 | The data is interpreted as a series of 16 bit numbers in network byte order, but
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| 34 | an odd number of bytes is also allowed.
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| 35 | .TP
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| 36 | .I size
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| 37 | The size of the data in bytes.
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| 38 | .SH "SEE ALSO"
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| 39 | .BR ip (4).
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| 40 | .br
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| 41 | .B RFC-1071
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| 42 | .SH AUTHOR
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| 43 | Philip Homburg (philip@cs.vu.nl)
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| 44 | .\"
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| 45 | .\" $PchId: oneC_sum.3,v 1.3 1996/02/22 21:05:31 philip Exp $
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