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.