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# Wrappers for iproute2 utilities
#
# **** 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 VyattaQosUtil;
require Exporter;
@EXPORT = qw/getRate getBurstSize getProtocol getDsfield getIfIndex interfaceRate/;
use strict;
sub get_num {
use POSIX qw(strtod);
my ($str) = @_;
$str =~s/^\s+//;
$str =~s/\s+$//;
$! = 0;
my ($num, $unparsed) = strtod($str);
if (($unparsed == length($str)) || $!) {
return; # undefined (bad input)
}
if ($unparsed > 0) { return $num, substr($str, -$unparsed); }
else { return $num; }
}
## get_rate("10mbit")
# convert rate specification to number
# from tc/tc_util.c
my %rates = (
'bit' => 1,
'kibit' => 1024,
'kbit' => 1000.,
'mibit' => 1048576.,
'mbit' => 1000000.,
'gibit' => 1073741824.,
'gbit' => 1000000000.,
'tibit' => 1099511627776.,
'tbit' => 1000000000000.,
'bps' => 8.,
'kibps' => 8192.,
'kbps' => 8000.,
'mibps' => 8388608.,
'mbps' => 8000000.,
'gibps' => 8589934592.,
'gbps' => 8000000000.,
'tibps' => 8796093022208.,
'tbps' => 8000000000000.,
);
sub getRate {
my $rate = shift;
my ($num, $suffix) = get_num($rate);
defined $num
or die "$rate is not a valid bandwidth (not a number)\n";
($num >= 0)
or die "$rate is not a valid bandwidth (negative value)\n";
if (defined $suffix) {
my $scale = $rates{lc $suffix};
if (defined $scale) {
return $num * $scale;
}
die "$rate is not a valid bandwidth (unknown scale suffix)\n";
} else {
# No suffix implies Kbps just as IOS
return $num * 1000;
}
}
my %scales = (
'b' => 1,
'k' => 1024,
'kb' => 1024,
'kbit' => 1024/8,
'm' => 1024*1024,
'mb' => 1024*1024,
'mbit' => 1024*1024/8,
'g' => 1024*1024*1024,
'gb' => 1024*1024*1024,
);
sub getBurstSize {
my $size = shift;
my ($num, $suffix) = get_num($size);
defined $num
or die "$size is not a valid burst size (not a number)\n";
($num >= 0)
or die "$size is not a valid burst size (negative value)\n";
if (defined $suffix) {
my $scale = $scales{lc $suffix};
defined $scale or
die "$size is not a valid burst size (unknown scale suffix)\n";
$num *= $scale;
}
return $num;
}
sub getProtocol {
my ($str) = @_;
defined $str or return;
if ($str =~ /^([0-9]+)|(0x[0-9a-fA-F]+)$/) {
if ($str < 0 || $str > 255) {
die "$str is not a valid protocol number\n";
}
return $str;
}
my ($name, $aliases, $proto) = getprotobyname($str);
(defined $proto) or die "\"$str\" unknown protocol\n";
return $proto;
}
# Parse /etc/iproute/rt_dsfield
# return a hex string "0x10" or undefined
sub getDsfield {
my ($str) = @_;
my $match = undef;
my $dsFileName = '/etc/iproute2/rt_dsfield';
defined $str or return;
# match number (or hex)
if ($str =~ /^([0-9]+)|(0x[0-9a-fA-F]+)$/) {
if ($str < 0 || $str > 63) {
die "$str is not a valid DSCP value\n";
}
# convert DSCP value to header value used by iproute
return $str << 2;
}
open my $ds, '<', $dsFileName || die "Can't open $dsFileName, $!\n";
while (<$ds>) {
next if /^#/;
chomp;
my ($value, $name) = split;
if ($str eq $name) {
$match = $value;
last;
}
}
close($ds) or die "read $dsFileName error\n";
(defined $match) or die "\"$str\" unknown DSCP value\n";
return $match;
}
sub getIfIndex {
my ($str) = @_;
defined $str or return;
open my $sysfs, "<", "/sys/class/net/$str/ifindex" || die "Unknown interface $str\n";
my $ifindex = <$sysfs>;
close($sysfs) or die "read sysfs error\n";
chomp $ifindex;
return $ifindex;
}
## interfaceRate("eth0")
# return result in bits per second
sub interfaceRate {
my ($interface) = @_;
my $config = new VyattaConfig;
$config->setLevel("interfaces ethernet");
if ($config->exists("$interface")) {
my $speed = $config->returnValue("$interface speed");
if (defined($speed) && $speed ne "auto") {
return $speed * 1000000;
}
}
return ethtoolRate($interface);
}
## ethtoolRate("eth0")
# Fetch actual rate using ethtool and format to valid tc rate
sub ethtoolRate {
my $dev = shift;
my $rate = undef;
open(my $ethtool, "/usr/sbin/ethtool $dev 2>/dev/null |")
or die "ethtool failed: $!\n";
# ethtool produces:
#
# Settings for eth1:
# Supported ports: [ TP ]
# ...
# Speed: 1000Mb/s
while (<$ethtool>) {
my @line = split;
if ($line[0] =~ /^Speed:/) {
$rate = $line[1];
$rate =~ s#Mb/s#000000#;
last;
}
}
close $ethtool;
return $rate;
}
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