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