ONEC_SUM.3
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操作系统开发
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C/C++
- .TH ONE_CSUM 3
- .SH NAME
- oneC_sum - One's complement internet checksum
- .SH SYNOPSIS
- .ft B
- .nf
- #define _MINIX_SOURCE 1
- #include <stddef.h>
- #include <sys/types.h>
- #include <net/gen/oneCsum.h>
- u16_t oneC_sum(u16_t fIprevfP, u16_t *fIdatafP, size_t fIsizefP)
- .fi
- .ft R
- .SH DESCRIPTION
- .B OneC_sum
- is used to calculate the one's complement checksum needed for IP network
- packets.
- A good document about the Internet Checksum is RFC-1071 (Computing the
- Internet checksum).
- .PP
- .B One_Csum
- expects three parameters:
- .TP 10
- .I prev
- The checksum of previous blocks of data that are to be included in the
- checksum.
- The value of prev in first call to oneC_sum should be 0.
- .TP
- .I data
- A pointer to the block of data.
- The data is interpreted as a series of 16 bit numbers in network byte order, but
- an odd number of bytes is also allowed.
- .TP
- .I size
- The size of the data in bytes.
- .SH "SEE ALSO"
- .BR ip (4).
- .br
- .B RFC-1071
- .SH AUTHOR
- Philip Homburg (philip@cs.vu.nl)