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
       entry. 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 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


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)