File Coverage

blib/lib/Net/Frame/Layer/IPv6/Fragment.pm

Criterion	Covered	Total	%
statement	34	45	75.5
branch	2	8	25.0
condition			n/a
subroutine	8	11	72.7
pod	6	6	100.0
total	50	70	71.4

#
# $Id: Fragment.pm 45 2014-04-09 07:51:48Z gomor $
#
package Net::Frame::Layer::IPv6::Fragment;
use strict; use warnings;

our $VERSION = '1.00';

use Net::Frame::Layer qw(:consts :subs);
use Exporter;
our @ISA = qw(Net::Frame::Layer Exporter);

our @AS = qw(
   nextHeader
   reserved
   fragmentOffset
   res
   mFlag
   identification
);
__PACKAGE__->cgBuildIndices;
__PACKAGE__->cgBuildAccessorsScalar(\@AS);

use Net::Frame::Layer::IPv6 qw(:consts);

sub new {
   shift->SUPER::new(
      nextHeader     => NF_IPv6_PROTOCOL_TCP,
      reserved       => 0,
      fragmentOffset => 0,
      res            => 0,
      mFlag          => 0,
      identification => 0,
      @_,
   );
}

sub getLength { 8 }

sub pack {
   my $self = shift;

   my $fragmentOffset = Bit::Vector->new_Dec(13, $self->fragmentOffset);
   my $res            = Bit::Vector->new_Dec( 2, $self->res);
   my $mFlag          = Bit::Vector->new_Dec( 1, $self->mFlag);
   my $v16            = $fragmentOffset->Concat_List($res, $mFlag);

   my $raw = $self->SUPER::pack('CCnN',
      $self->nextHeader, $self->reserved, $v16->to_Dec, $self->identification
   ) or return;

   return $self->raw($raw);
}

sub unpack {
   my $self = shift;

   my ($nextHeader, $reserved, $fragflags, $identification, $payload) =
      $self->SUPER::unpack('CCnN a*', $self->raw)
         or return;

   $self->nextHeader($nextHeader);
   $self->reserved($reserved);

   my $v16 = Bit::Vector->new_Dec(16, $fragflags);

   $self->fragmentOffset($v16->Chunk_Read(13, 3));
   $self->res           ($v16->Chunk_Read( 2, 1));
   $self->mFlag         ($v16->Chunk_Read( 1, 0));

   $self->identification($identification);

   $self->payload($payload);

   return $self;
}

sub encapsulate {
   my $self = shift;

   return $self->nextLayer if $self->nextLayer;

   if ($self->payload) {
      my $next = $self->nextHeader;
      return Net::Frame::Layer::IPv6->new(nextHeader => $self->nextHeader)->encapsulate;
   }

   return NF_LAYER_NONE;
}

sub print {
   my $self = shift;

   my $l = $self->layer;
   my $buf = sprintf
      "$l: nextHeader:0x%02x  reserved:%d  fragmentOffset:0x%04x\n".
      "$l: res:%d  mFlag:%d  identification:%d",
         $self->nextHeader, $self->reserved, $self->fragmentOffset,
         $self->res, $self->mFlag, $self->identification;

   return $buf;
}

1;

__END__