49 lines
1.3 KiB
Groff
49 lines
1.3 KiB
Groff
.TH nl\-pktloc-lookup 8 "27 October 2010" "libnl"
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.SH NAME
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nl\-pktloc\-lookup - Lookup packet location definitions
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.SH SYNOPSIS
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.B nl\-pktloc\-lookup
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.I name
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.br
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.B nl\-pktloc\-lookup \-\-list
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.SH DESCRIPTION
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.PP
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nl\-pktloc\-lookup searches the packet location database for a matching
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entry. It is used to resolve packet location aliases to their definition,
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i.e. alignment, layer, offset, and mask.
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.SH OPTIONS
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.TP
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.BR \-\^h " or " \-\-help
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Print help text to console and exit.
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.TP
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.BR \-\^v " or " \-\-version
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Print versioning information to console and exit.
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.TP
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.BR \-\^l " or " \-\-list
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List all packet location definitions.
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.TP
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.BR \-\-u32=VALUE
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Prints the packet location definition in a special format that is
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understood by iproute2's u32 selector parser. It will output a
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u32 selector which will compare the provided value with the value
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specified by the packet location.
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Please note that due to the limitation of u32, it is not possible
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to use packet locations based on the link layer. nl-pktloc-lookup
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will print an error message in this case.
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Example:
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selector=$(nl-pktloc-lookup --u32 22 tcp.sport)
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tc filter add [...] u32 match $(selector) flowid 1:2
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.SH FILES
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.PP
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/etc/libnl/pktloc
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.SH AUTHOR
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.PP
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Thomas Graf is the original author and current maintainer of libnl and
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libnl tools. Many people have contributed to it since.
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