debian man page for nl-pktloc-lookup

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 defini-
       tion, 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)