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.