ONEC_SUM.3
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- ONE_CSUM(3) Minix Programmer's Manual ONE_CSUM(3)
- NAME
- oneC_sum - One's complement internet checksum
- SYNOPSIS
- #define _MINIX_SOURCE 1
- #include <stddef.h>
- #include <sys/types.h>
- #include <net/gen/oneCsum.h>
- u16_t oneC_sum(u16_t prev, u16_t *data, size_t size)
- DESCRIPTION
- 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).
- One_Csum expects three parameters:
- 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.
- 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.
- size The size of the data in bytes.
- SEE ALSO
- ip(4).
- RFC-1071
- AUTHOR
- Philip Homburg (philip@cs.vu.nl)
- 1