nl-pktloc-lookup(8)	     System Manager's Manual	     nl-pktloc-lookup(8)

NAME
     nl-pktloc-lookup - Lookup packet location definitions

SYNOPSIS
     nl-pktloc-lookup name
     nl-pktloc-lookup --list


DESCRIPTION
     nl-pktloc-lookup  searches	 the packet location database for a matching en-
     try. It is used to resolve packet location	 aliases  to  their  definition,
     i.e. alignment, layer, offset, and mask.


OPTIONS
     -h or --help
	    Print help text to console and exit.

     -v or --version
	    Print versioning information to console and exit.

     -l or --list
	    List all packet location definitions.

     --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 speci-
	    fied 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


FILES
     /etc/libnl/pktloc


AUTHOR
     Thomas Graf is the original author and  current  maintainer  of  libnl  and
     libnl tools. Many people have contributed to it since.

libnl				 27 October 2010	     nl-pktloc-lookup(8)