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#!/usr/bin/perl
#
# **** 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.
#
# A copy of the GNU General Public License is available as
# `/usr/share/common-licenses/GPL' in the Debian GNU/Linux distribution
# or on the World Wide Web at `http://www.gnu.org/copyleft/gpl.html'.
# You can also obtain it by writing to the Free Software Foundation,
# Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
# MA 02110-1301, USA.
#
# This code was originally developed by Vyatta, Inc.
# Portions created by Vyatta are Copyright (C) 2007 Vyatta, Inc.
# All Rights Reserved.
#
# Author: Stephen Hemminger
# Date: September 2008
# Description: Script to setup bonding interfaces
#
# **** End License ****
#
use lib "/opt/vyatta/share/perl5/";
use Vyatta::Interface;
use Vyatta::Config;
use Getopt::Long;
use strict;
use warnings;
my %modes = (
"round-robin" => 0,
"active-backup" => 1,
"xor-hash" => 2,
"broadcast" => 3,
"802.3ad" => 4,
"transmit-load-balance" => 5,
"adaptive-load-balance" => 6,
);
sub set_mode {
my ( $intf, $mode ) = @_;
my $val = $modes{$mode};
die "Unknown bonding mode $mode\n" unless defined($val);
open my $fm, '>', "/sys/class/net/$intf/bonding/mode"
or die "Error: $intf is not a bonding device:$!\n";
print {$fm} $val, "\n";
close $fm
or die "Error: $intf can not set mode $val:$!\n";
}
sub get_slaves {
my $intf = shift;
open my $f, '<', "/sys/class/net/$intf/bonding/slaves"
or die "$intf is not a bonding interface";
my $slaves = <$f>;
close $f;
return unless $slaves;
chomp $slaves;
return split( ' ', $slaves );
}
sub add_slave {
my ( $intf, $slave ) = @_;
my $sysfs_slaves = "/sys/class/net/$intf/bonding/slaves";
open my $f, '>', $sysfs_slaves
or die "Can't open $sysfs_slaves: $!";
print {$f} "+$slave\n";
close $f;
}
sub remove_slave {
my ( $intf, $slave ) = @_;
my $sysfs_slaves = "/sys/class/net/$intf/bonding/slaves";
open my $f, '>', $sysfs_slaves
or die "Can't open $sysfs_slaves: $!";
print {$f} "-$slave\n";
close $f;
}
# Go dumpster diving to figure out which ethernet interface (if any)
# gave it's address to be used by all bonding devices.
sub primary_slave {
my ( $intf, $bond_addr ) = @_;
open my $p, '<', "/proc/net/bonding/$intf"
or die "Can't open /proc/net/bonding/$intf : $!";
my ( $dev, $match );
while ( my $line = <$p> ) {
chomp $line;
if ( $line =~ m/^Slave Interface: (.*)$/ ) {
$dev = $1;
}
elsif ( $line =~ m/^Permanent HW addr: (.*)$/ ) {
if ( $1 eq $bond_addr ) {
$match = $dev;
last;
}
}
}
close $p;
return $match;
}
sub if_down {
my $intf = shift;
system "ip link set dev $intf down"
and die "Could not set $intf up ($!)\n";
}
sub if_up {
my $intf = shift;
system "ip link set dev $intf up"
and die "Could not set $intf up ($!)\n";
}
sub change_mode {
my ( $intf, $mode ) = @_;
my $interface = new Vyatta::Interface($intf);
die "$intf is not a valid interface" unless $interface;
my $primary = primary_slave( $intf, $interface->hw_address() );
my @slaves = get_slaves($intf);
foreach my $slave (@slaves) {
remove_slave( $intf, $slave ) unless ( $primary && $slave eq $primary );
}
remove_slave( $intf, $primary ) if ($primary);
my $bond_up = $interface->up();
if_down($intf) if $bond_up;
set_mode( $intf, $mode );
if_up($intf) if $bond_up;
foreach my $slave ( @slaves ) {
add_slave( $intf, $slave );
}
}
# bonding requires interface to be down before enslaving
# but enslaving automatically brings interface up!
sub add_port {
my ( $intf, $slave ) = @_;
my $slaveif = new Vyatta::Interface($slave);
if ($slaveif->up()) {
if_down($slave);
} else {
my $cfg = new Vyatta::Config;
$cfg->setLevel($slaveif->path());
die "Can not add disabled interface $slave to bond-group $intf\n"
if $cfg->exists('disable');
}
add_slave ($intf, $slave);
}
sub remove_port {
my ( $intf, $slave ) = @_;
remove_slave ($intf, $slave);
if_up ($slave);
}
sub usage {
print "Usage: $0 --dev=bondX --mode={mode}\n";
print " $0 --dev=bondX --add=ethX\n";
print " $0 --dev=bondX --remove=ethX\n";
print print "modes := ", join( ',', sort( keys %modes ) ), "\n";
exit 1;
}
my ( $dev, $mode, $add_port, $rem_port );
GetOptions(
'dev=s' => \$dev,
'mode=s' => \$mode,
'add=s' => \$add_port,
'remove=s' => \$rem_port,
) or usage();
die "$0: device not specified\n" unless $dev;
change_mode( $dev, $mode ) if $mode;
add_port( $dev, $add_port ) if $add_port;
remove_port( $dev, $rem_port ) if $rem_port;
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