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# Traffic limiter
# This is a rate limiter based on ingress qdisc
#
# **** 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 LimiterClass;
use strict;
require VyattaConfig;
use VyattaQosMatch;
my %fields = (
id => undef,
priority => undef,
burst => undef,
rate => undef,
_match => undef,
);
sub new {
my ( $that, $config, $id ) = @_;
my $class = ref($that) || $that;
my $self = {%fields};
$self->{id} = $id;
bless $self, $class;
$self->_define($config);
return $self;
}
sub _define {
my ( $self, $config ) = @_;
my $level = $config->setLevel();
my @matches = ();
my $rate = $config->returnValue("bandwidth");
defined $rate or die "bandwidth must be defined for $level\n";
$self->{rate} = VyattaQosUtil::getRate($rate);
$self->{burst} = $config->returnValue("burst");
defined $self->{burst} or die "burst must be defined for $level\n";
$self->{priority} = $config->returnValue("priority");
foreach my $match ( $config->listNodes("match") ) {
$config->setLevel("$level match $match");
push @matches, new VyattaQosMatch($config);
}
$self->{_match} = \@matches;
}
sub matchRules {
my ($self) = @_;
my $matches = $self->{_match};
return @$matches;
}
}
package VyattaQosTrafficLimiter;
use strict;
require VyattaConfig;
use VyattaQosUtil;
my %fields = (
_level => undef,
_classes => undef,
);
# new VyattaQosTrafficLimiter($config)
# Create a new instance based on config information
sub new {
my ( $that, $config, $name ) = @_;
my $self = {%fields};
my $class = ref($that) || $that;
bless $self, $class;
$self->_define($config);
return $self;
}
# Setup new instance.
# Assumes caller has done $config->setLevel to "traffic-limiter $name"
sub _define {
my ( $self, $config ) = @_;
my $level = $config->setLevel();
my @classes = ();
$self->{_level} = $level;
# make sure no clash of different types of tc filters
my %matchTypes = ();
foreach my $class ( $config->listNodes("class") ) {
foreach my $match ( $config->listNodes("class $class match") ) {
foreach my $type ( $config->listNodes("class $class match $match") )
{
$matchTypes{$type} = "$class match $match";
}
}
}
if ( scalar keys %matchTypes > 1 && $matchTypes{ip} ) {
print "Match type conflict:\n";
while ( my ( $type, $usage ) = each(%matchTypes) ) {
print " class $usage $type\n";
}
die "$level can not match on both ip and other types\n";
}
foreach my $id ( $config->listNodes("class") ) {
$config->setLevel("$level class $id");
push @classes, new LimiterClass( $config, $id );
}
$self->{_classes} = \@classes;
}
sub commands {
my ( $self, $out, $dev ) = @_;
my $classes = $self->{_classes};
my $parent = 0xffff;
printf {$out} "qdisc add dev %s handle %x: ingress\n", $dev, $parent;
foreach my $class (@$classes) {
foreach my $match ( $class->matchRules() ) {
$match->filter( $out, $dev, $parent, $class->{priority} );
printf {$out} " police rate %s burst %s drop flowid :%x\n",
$class->{rate}, $class->{burst}, $class->{id};
}
}
}
# Walk configuration tree and look for changed nodes
# The configuration system should do this but doesn't do it right
sub isChanged {
my ( $self, $name ) = @_;
my $config = new VyattaConfig;
$config->setLevel("qos-policy traffic-limiter $name");
my %classNodes = $config->listNodeStatus('class');
while ( my ( $class, $status ) = each %classNodes ) {
if ( $status ne 'static' ) {
return "class $class";
}
foreach my $attr ( 'bandwidth', 'burst', 'priority' ) {
if ( $config->isChanged("class $class $attr") ) {
return "class $class $attr";
}
}
my %matchNodes = $config->listNodeStatus("class $class match");
while ( my ( $match, $status ) = each %matchNodes ) {
my $level = "class $class match $match";
if ( $status ne 'static' ) {
return $level;
}
foreach my $parm (
'vif',
'interface',
'ip dscp',
'ip protocol',
'ip source address',
'ip destination address',
'ip source port',
'ip destination port'
)
{
if ( $config->isChanged("$level $parm") ) {
return "$level $parm";
}
}
}
}
return undef; # false
}
1;
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