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|
# Traffic shaper
# This is a extended form of Hierarchal Token Bucket with
# more admin friendly features. Similar in spirt to other shaper scripts
# such as wondershaper.
{
package ShaperClass;
use strict;
require VyattaConfig;
use VyattaQosMatch;
my %fields = (
id => undef,
_priority => undef,
_rate => undef,
_ceiling => undef,
_burst => undef,
_match => undef,
);
sub new {
my ( $that, $config, $id ) = @_;
my $class = ref($that) || $that;
my $self = {%fields};
bless $self, $class;
$self->_define($config, $id);
return $self;
}
sub _define {
my ( $self, $config, $id ) = @_;
my $level = $config->setLevel();
my @matches = ();
$self->{_id} = sprintf "%04x", $id;
$self->{_priority} = $config->returnValue("priority");
$self->{_rate} = $config->returnValue("rate");
$self->{_ceiling} = $config->returnValue("ceiling");
$self->{_burst} = $config->returnValue("burst");
foreach my $match ($config->listNodes("match")) {
$config->setLevel("$level match $match");
push @matches, new VyattaQosMatch($config);
}
$self->{_match} = \@matches;
}
sub _getPercentRate {
my ($rate, $speed) = @_;
if ( ! defined $rate ) {
return; # leave rate undef
}
# Rate might be a percentage of speed
if ( $rate =~ /%$/ ) {
my $percent = substr( $rate, 0, length($rate) - 1 );
if ( $percent < 0 || $percent > 100 ) {
die "Invalid percentage bandwidth\n";
}
$rate = ( $percent * $speed ) / 100.;
} else {
$rate = VyattaQosUtil::getRate($rate);
}
return $rate;
}
sub commands {
my ( $self, $out, $dev, $speed ) = @_;
my $rate = _getPercentRate($self->{_rate}, $speed);
my $ceil = _getPercentRate($self->{_ceiling}, $speed);
my $id = $self->{_id};
my $matches = $self->{_match};
die "Rate is not defined\n" if (! defined $rate );
die "Class $id rate $rate > shaper rate $speed\n" if ($rate > $speed);
# create the class
my $cmd ="class add dev $dev parent 1:1 classid 1:$id htb rate $rate";
if ( defined $ceil) {
if ($ceil < $rate ) {
die "Rate limit (ceiling) $ceil < base rate $rate\n";
}
$cmd .= " ceil $ceil";
}
$cmd .= " burst $self->{_burst}" if ( defined $self->{_burst} );
$cmd .= " prio $self->{_priority}" if ( defined $self->{_priority} );
print {$out} $cmd . "\n";
# create leaf qdisc
print {$out} "qdisc add dev $dev parent 1:$id sfq\n";
foreach my $match (@$matches) {
$match->filter( $out, $dev, $id );
}
}
}
package VyattaQosTrafficShaper;
@ISA = qw/VyattaQosPolicy/;
use strict;
require VyattaConfig;
use VyattaQosUtil;
my $defaultId = 0x4000;
my %fields = (
_rate => undef,
_classes => undef,
);
# new VyattaQosTrafficShaper($config)
# Create a new instance based on config information
sub new {
my ( $that, $config ) = @_;
my $self = {%fields};
my $class = ref($that) || $that;
bless $self, $class;
$self->_define($config);
return $self;
}
# Rate can be something like "auto" or "10.2mbit"
sub _getAutoRate {
my ($rate, $dev) = @_;
if ( $rate eq "auto" ) {
my $rate = VyattaQosUtil::interfaceRate($dev);
if ( ! defined $rate ) {
die "Auto speed setting but can't get rate from $dev\n";
}
} else {
$rate = VyattaQosUtil::getRate($rate);
}
return $rate;
}
# Setup new instance.
# Assumes caller has done $config->setLevel to "traffic-shaper $name"
sub _define {
my ( $self, $config ) = @_;
my $level = $config->setLevel();
my @classes = ( );
$self->{_rate} = $config->returnValue("rate");
$config->setLevel("$level default");
push @classes, new ShaperClass( $config, $defaultId);
$config->setLevel($level);
foreach my $id ( $config->listNodes("class") ) {
$config->setLevel("$level class $id");
push @classes, new ShaperClass( $config, $id );
}
$self->{_classes} = \@classes;
}
sub commands {
my ( $self, $out, $dev ) = @_;
my $rate = _getAutoRate($self->{_rate}, $dev);
my $classes = $self->{_classes};
my @tc = ( );
print {$out} "qdisc add dev $dev root handle 1: htb default $defaultId\n";
print {$out} "class add dev $dev parent 1: classid 1:1 htb rate $rate\n";
foreach my $class (@$classes) {
$class->commands( $out, $dev, $rate );
}
}
1;
|
