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package VyattaQosUtil;
use POSIX;
require Exporter;
@EXPORT = qw/getRate getSize getProtocol getDsfield getIfIndex interfaceRate/;
use strict;
sub get_num {
my ($str) = @_;
# clear errno
$! = 0;
my ($num, $unparsed) = POSIX::strtod($str);
if (($str eq '') || $!) {
return; # undefined (bad input)
}
if ($unparsed > 0) { return $num, substr($str, -$unparsed); }
else { return $num; }
}
## get_rate("10mbit")
# convert rate specification to number
# from tc/tc_util.c
sub getRate {
my $rate = shift;
my ($num, $suffix) = get_num($rate);
defined $num or die "Invald bandwith string: $rate\n";
if (defined $suffix) {
SWITCH: {
($suffix eq 'bit') && do { last SWITCH; };
($suffix eq 'kibit') && do { $num *= 1024.; last SWITCH };
($suffix eq 'kbit') && do { $num *= 1000.,; last SWITCH; };
($suffix eq 'mibit') && do { $num *= 1048576.,; last SWITCH; };
($suffix eq 'mbit') && do { $num *= 1000000.,; last SWITCH; };
($suffix eq 'gibit') && do { $num *= 1073741824.,; last SWITCH; };
($suffix eq 'gbit') && do { $num *= 1000000000.,; last SWITCH; };
($suffix eq 'tibit') && do { $num *= 1099511627776.,; last SWITCH; };
($suffix eq 'tbit') && do { $num *= 1000000000000.,; last SWITCH; };
($suffix eq 'bps') && do { $num *= 8.,; last SWITCH; };
($suffix eq 'kibps') && do { $num *= 8192.,; last SWITCH; };
($suffix eq 'kbps') && do { $num *= 8000.,; last SWITCH; };
($suffix eq 'mibps') && do { $num *= 8388608.,; last SWITCH; };
($suffix eq 'mbps') && do { $num *= 8000000.,; last SWITCH; };
($suffix eq 'gibps') && do { $num *= 8589934592.,; last SWITCH; };
($suffix eq 'gbps') && do { $num *= 8000000000.,; last SWITCH; };
($suffix eq 'tibps') && do { $num *= 8796093022208.,; last SWITCH; };
($suffix eq 'tbps') && do { $num *= 8000000000000.,; last SWITCH; };
die "Unknown bandwidth suffix \"$suffix\"\n";
}
} else {
# No suffix implies Kbps just as IOS
$num *= 1000;
}
($num >= 0) or die "Negative bandwidth not allowed\n";
return $num;
}
sub getSize {
my $size = shift;
my ($num, $suffix) = get_num($size);
defined $num or die "Invald size string: $size\n";
if (defined $suffix) {
SWITCH: {
($suffix eq 'b') && do { $num *= 1.,; last SWITCH; };
($suffix eq 'k') && do { $num *= 1024.,; last SWITCH; };
($suffix eq 'kb') && do { $num *= 1024.,; last SWITCH; };
($suffix eq 'kbit') && do { $num *= 128.,; last SWITCH; };
($suffix eq 'm') && do { $num *= 1048576.,; last SWITCH; };
($suffix eq 'mb') && do { $num *= 1048576.,; last SWITCH; };
($suffix eq 'mbit') && do { $num *= 131072.,; last SWITCH; };
($suffix eq 'g') && do { $num *= 1073741824.,; last SWITCH; };
($suffix eq 'gb') && do { $num *= 1073741824.,; last SWITCH; };
($suffix eq 'gbit') && do { $num *= 134217728.,; last SWITCH; };
die "Unknown suffix suffix \"$suffix\"\n";
}
}
$num >= 0 or die "Negative size not allowed\n";
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 dsfield 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) = @_;
my $rate = undef;
open my $ethtool, "-|"
or exec 'sudo', 'ethtool', $dev
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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