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A couple of minor clarifications.

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Yaroslav Tykhiy 2004-01-21 13:17:24 +00:00
parent 98c8c6138e
commit fbde705ac4
1 changed files with 4 additions and 4 deletions
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8
share/man/man9/mbuf.9
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@ -823,14 +823,14 @@ The TCP checksum is to be computed. (See below.)
The UDP checksum is to be computed. (See below.)
.El
.Pp
Should the TCP or UDP checksum be calculated in the hardware,
Should a TCP or UDP checksum be offloaded to the hardware,
the field
.Va csum_data
will contain the byte offset of the checksum field relative to the
end of the IP header.
In this case, the checksum field will be initially
set by the TCP/IP module to the checksum of the pseudo header
defined by the protocol specification.
defined by the TCP and UDP specifications.
.Pp
For outbound packets which have been fragmented
by the host CPU, the following will also be true,
@ -884,11 +884,11 @@ Can be set only along with
.Dv CSUM_DATA_VALID
to indicate that the IP data checksum found in
.Va csum_data
allows for the pseudo header.
allows for the pseudo header defined by the TCP and UDP specifications.
Otherwise the checksum of the pseudo header must be calculated by
the host CPU and added to
.Va csum_data
to obtain the final checksum to be used for validation purposes.
to obtain the final checksum to be used for TCP or UDP validation purposes.
.El
.Pp
If a particular network interface just indicates success or