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# This is a wrapper around Network Emulator (netem) queue discipline
#
# **** License ****
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# This code was originally developed by Vyatta, Inc.
# Portions created by Vyatta are Copyright (C) 2008 Vyatta, Inc.
# All Rights Reserved.
# **** End License ****
package Vyatta::Qos::NetworkEmulator;
use strict;
use warnings;
require Vyatta::Config;
use Vyatta::Qos::Util;
sub new {
my ( $that, $config ) = @_;
my $level = $config->setLevel();
my $class = ref($that) || $that;
my $self = { };
my $bw = $config->returnValue("bandwidth");
$self->{_rate} = getRate( $bw ) if ($bw);
my $delay = $config->returnValue("network-delay");
$self->{_delay} = getTime($delay) if ($delay);
$self->{_burst} = $config->returnValue("burst");
$self->{_limit} = $config->returnValue("queue-limit");
$self->{_drop} = $config->returnValue("packet-loss");
$self->{_corrupt} = $config->returnValue("packet-corruption");
$self->{_reorder} = $config->returnValue("packet-reordering");
return bless $self, $class;
}
sub commands {
my ( $self, $dev ) = @_;
my $rate = $self->{_rate};
if ($rate) {
my $burst = $self->{_burst};
$burst or $burst = "15K";
printf "qdisc add dev %s root handle 1:0 tbf rate %s burst %s\n",
$dev, $rate, $burst;
printf "qdisc add dev %s parent 1:1 handle 10: netem", $dev;
} else {
printf "qdisc add dev %s root netem", $dev;
}
my $delay = $self->{_delay};
print " delay $delay" if ($delay);
my $limit = $self->{_limit};
print " limit $limit" if ($limit);
my $drop = $self->{_drop};
print " drop $drop" if ($drop);
my $corrupt = $self->{_corrupt};
print " corrupt $corrupt" if ($corrupt);
my $reorder = $self->{_reorder};
print " reorder $reorder" if ($reorder);
print "\n";
}
sub isChanged {
my ( $self, $name ) = @_;
my $config = new Vyatta::Config;
$config->setLevel("qos-policy network-emulator $name");
foreach my $attr ( "bandwidth", "burst", "queue-limit", "network-delay",
"packet-loss", "packet-corruption", "packet-reordering", ) {
return $attr if ( $config->isChanged($attr) );
}
return;
}
1;
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