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libnl-utils - Utilities for dealing with netlink sockets…  more info»

nl-pktloc-lookup.8.gz

nl-pktloc-lookup(8)                              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 com‐
              pare 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)
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