NAME

Net::Packet::LLC - Logical-Link Control layer 3 object

SYNOPSIS

   use Net::Packet::Consts qw(:llc);
   require Net::Packet::LLC;

   # Build a layer
   my $layer = Net::Packet::LLC->new(
      dsap    => NP_LLC_DSAP_SNAP,
      ig      => 1,
      ssap    => NP_LLC_SSAP_SNAP,
      cr      => 1,
      control => 0x03,
      oui     => NP_LLC_OUI_CISCO,
      pid     => NP_LLC_PID_CDP,
   );
   $layer->pack;

   print 'RAW: '.unpack('H*', $layer->raw)."\n";

   # Read a raw layer
   my $layer = Net::Packet::LLC->new(raw => $raw);

   print $layer->print."\n";
   print 'PAYLOAD: '.unpack('H*', $layer->payload)."\n"
      if $layer->payload;

DESCRIPTION

This modules implements the encoding and decoding of the Logical-Link Control layer.

See also Net::Packet::Layer and Net::Packet::Layer3 for other attributes and methods.

ATTRIBUTES

dsap - 7 bits
ig - 1 bit
ssap - 7 bits
cr - 1 bit
control - 8 bits
oui - 24 bits
pid - 16 bits

METHODS

new

Object constructor. You can pass attributes that will overwrite default ones. Default values:

dsap: NP_LLC_DSAP_SNAP

ig: 1

ssap: NP_LLC_SSAP_SNAP

cr: 1

control: 0x03

oui: NP_LLC_OUI_CISCO

pid: NP_LLC_PID_CDP

pack

Packs all attributes into a raw format, in order to inject to network. Returns 1 on success, undef otherwise.

unpack

Unpacks raw data from network and stores attributes into the object. Returns 1 on success, undef otherwise.

CONSTANTS

Load them: use Net::Packet::Consts qw(:llc);

NP_LLC_HDR_LEN: LLC header length.
NP_LLC_OUI_CISCO: Oui attribute constants.
NP_LLC_PID_CDP
NP_LLC_PID_STP: Pid attribute constants.
NP_LLC_DSAP_SNAP: Dsap attribute constants.
NP_LLC_SSAP_SNAP: Ssap attribute constants.

AUTHOR

Patrice <GomoR> Auffret

COPYRIGHT AND LICENSE

You may distribute this module under the terms of the Artistic license. See LICENSE.Artistic file in the source distribution archive.

RELATED MODULES

NetPacket, Net::RawIP, Net::RawSock