1nl-pktloc-lookup(8)         System Manager's Manual        nl-pktloc-lookup(8)
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NAME

6       nl-pktloc-lookup - Lookup packet location definitions
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SYNOPSIS

9       nl-pktloc-lookup name
10       nl-pktloc-lookup --list
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DESCRIPTION

14       nl-pktloc-lookup  searches  the packet location database for a matching
15       entry. It is used to resolve packet location aliases to  their  defini‐
16       tion, i.e. alignment, layer, offset, and mask.
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OPTIONS

20       -h or --help
21              Print help text to console and exit.
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23       -v or --version
24              Print versioning information to console and exit.
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26       -l or --list
27              List all packet location definitions.
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29       --u32=VALUE
30              Prints  the  packet location definition in a special format that
31              is understood by iproute2's u32 selector parser. It will  output
32              a  u32  selector  which will compare the provided value with the
33              value specified by the packet location.
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35              Please note that due to the limitation of u32, it is not  possi‐
36              ble  to use packet locations based on the link layer. nl-pktloc-
37              lookup will print an error message in this case.
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39              Example:
40                selector=$(nl-pktloc-lookup --u32 22 tcp.sport)
41                tc filter add [...] u32 match $(selector) flowid 1:2
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FILES

45       /etc/libnl/pktloc
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AUTHOR

49       Thomas Graf is the original author and current maintainer of libnl  and
50       libnl tools. Many people have contributed to it since.
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54libnl                           27 October 2010            nl-pktloc-lookup(8)