GeniAggregate.pm.in 22.7 KB
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#!/usr/bin/perl -wT
#
# EMULAB-COPYRIGHT
# Copyright (c) 2008 University of Utah and the Flux Group.
# All rights reserved.
#
package GeniAggregate;

#
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# Some simple aggregate stuff.
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#
use strict;
use Exporter;
use vars qw(@ISA @EXPORT);

@ISA    = "Exporter";
@EXPORT = qw ( );

# Must come after package declaration!
use lib '@prefix@/lib';
use GeniDB;
use GeniCredential;
use GeniCertificate;
use GeniSliver;
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use GeniSlice;
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use GeniRegistry;
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use libdb qw(TBGetUniqueIndex);
use English;
use overload ('""' => 'Stringify');
use XML::Simple;

# Configure variables
my $TB		   = "@prefix@";
my $TBOPS          = "@TBOPSEMAIL@";
my $TBAPPROVAL     = "@TBAPPROVALEMAIL@";
my $TBAUDIT   	   = "@TBAUDITEMAIL@";
my $BOSSNODE       = "@BOSSNODE@";
my $OURDOMAIN      = "@OURDOMAIN@";
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my $PGENIDOMAIN    = "@PROTOGENI_DOMAIN@";
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my $SIGNCRED	   = "$TB/sbin/signgenicred";
my $VERIFYCRED	   = "$TB/sbin/verifygenicred";

# Cache of instances to avoid regenerating them.
my %aggregates     = ();

#
# Lookup by idx, or uuid.
#
sub Lookup($$)
{
    my ($class, $token) = @_;
    my $query_result;
    my $idx;

    if ($token =~ /^\d+$/) {
	$idx = $token;
    }
    elsif ($token =~ /^\w+\-\w+\-\w+\-\w+\-\w+$/) {
	$query_result =
	    DBQueryWarn("select idx from geni_aggregates ".
			"where uuid='$token'");
	    return undef
		if (! $query_result || !$query_result->numrows);

	    ($idx) = $query_result->fetchrow_array();
    }
    else {
	return undef;
    }
    # Look in cache first
    return $aggregates{"$idx"}
        if (exists($aggregates{"$idx"}));

    $query_result =
	DBQueryWarn("select * from geni_aggregates where idx='$idx'");
    
    return undef
	if (!$query_result || !$query_result->numrows);

    my $self              = {};
    $self->{'AGGREGATE'}  = $query_result->fetchrow_hashref();
    $self->{'CREDENTIAL'} = undef;
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    $self->{'SLICE'}      = undef;
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    $self->{'PARENT'}     = undef;
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    # Bless into sub package if called for.
    my $type = $self->{'AGGREGATE'}->{'type'};
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    if (defined($type) && $type ne "" && $type ne "Aggregate") {
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	bless($self, $class . "::" . $type);
    }
    else {
	bless($self, $class);
    }
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    #
    # Grab the certificate, since we will probably want it.
    #
    my $uuid = $self->{'AGGREGATE'}->{'uuid'};
    my $certificate = GeniCertificate->Lookup($uuid);
    if (!defined($certificate)) {
	print STDERR "Could not find certificate for aggregate $idx ($uuid)\n";
	return undef;
    }
    $self->{'CERTIFICATE'} = $certificate;
    
    # Add to cache. 
    $aggregates{$self->{'AGGREGATE'}->{'idx'}} = $self;
    
    return $self;
}

#
# Stringify for output.
#
sub Stringify($)
{
    my ($self) = @_;
    
    my $uuid = $self->uuid();
    my $idx  = $self->idx();

    return "[GeniAggregate: $uuid, IDX: $idx]";
}

#
# Create a Geni aggregate in the DB. This happens on the server side only
# for now. The client side does not actually know its an aggregate, at
# least not yet.
#
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sub Create($$$$$$)
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{
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    my ($class, $slice, $owner, $aggregate_type, $hrn, $nickname) = @_;
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    my @insert_data = ();

    # Every aggregate gets a new unique index.
    my $idx = TBGetUniqueIndex('next_aggregate', 1);

    # Create a cert pair, which gives us a new uuid.
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    my $certificate = GeniCertificate->Create("aggregate", $hrn, $TBOPS);
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    if (!defined($certificate)) {
	print STDERR "Could not generate new certificate and UUID!\n";
	return undef;
    }
    my $uuid        = $certificate->uuid();
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    my $slice_uuid  = $slice->uuid();
    my $owner_uuid  = $owner->uuid();
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    $aggregate_type = "Aggregate"
    	if (! defined($aggregate_type));

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    # Now tack on other stuff we need.
    push(@insert_data, "created=now()");
    push(@insert_data, "idx='$idx'");
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    push(@insert_data, "hrn=" . DBQuoteSpecial($hrn));
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    push(@insert_data, "nickname=" . DBQuoteSpecial($nickname));
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    push(@insert_data, "uuid='$uuid'");
    push(@insert_data, "creator_uuid='$owner_uuid'");
    push(@insert_data, "slice_uuid='$slice_uuid'");
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    push(@insert_data, "type='$aggregate_type'");
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    # Insert into DB.
    if (!DBQueryWarn("insert into geni_aggregates set " .
		     join(",", @insert_data))) {
	$certificate->Delete();
	return undef;
    }
    return GeniAggregate->Lookup($idx);
}
# accessors
sub field($$) { return ((! ref($_[0])) ? -1 : $_[0]->{'AGGREGATE'}->{$_[1]}); }
sub idx($)		{ return field($_[0], "idx"); }
sub uuid($)		{ return field($_[0], "uuid"); }
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sub nickname($)		{ return field($_[0], "nickname"); }
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sub type($)		{ return field($_[0], "type"); }
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sub slice_uuid($)	{ return field($_[0], "slice_uuid"); }
sub creator_uuid($)	{ return field($_[0], "creator_uuid"); }
sub created($)		{ return field($_[0], "created"); }
sub credential_idx($)	{ return field($_[0], "credential_idx"); }
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sub aggregate_idx($)	{ return field($_[0], "aggregate_idx"); }
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sub status($)		{ return field($_[0], "status"); }
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sub cert($)		{ return $_[0]->{'CERTIFICATE'}->cert(); }
sub GetCertificate($)   { return $_[0]->{'CERTIFICATE'}; }

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#
# Destroy all the slivers in the aggregate, and then the aggregate if there
# is nothing in it. Leave it around if something goes wrong.
#
sub Delete($)
{
    my ($self) = @_;
    my $broken = 0;

    return -1
	if (! ref($self));

    my @slivers = ();
    if ($self->SliverList(\@slivers) != 0) {
	print STDERR "Could not get sliver list for $self\n";
	return -1;
    }
    foreach my $sliver (@slivers) {
	if ($sliver->status() eq "broken") {
	    $broken++;
	    next;
	}
	if ($sliver->Delete() != 0) {
	    print STDERR "Could not delete $sliver from $self\n";
	    $sliver->SetStatus("broken");
	    $broken++;
	    next;
	}
    }
    return -1
	if ($broken);
    
    my $idx  = $self->idx();
    my $uuid = $self->uuid();

    DBQueryWarn("delete from geni_credentials where this_uuid='$uuid'")
	or return -1;
    DBQueryWarn("delete from geni_certificates where uuid='$uuid'")
	or return -1;
    DBQueryWarn("delete from geni_aggregates where idx='$idx'")
	or return -1;
    
    return 0;
}

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#
# Cons up an hrn.
#
sub hrn($)
{
    my ($self) = @_;

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    my $hrn = field($self, "hrn");

    if (defined($hrn) && $hrn ne "") {
	return $hrn;
    }
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    return "${PGENIDOMAIN}.aggregate_" . $self->idx();
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}

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#
# Look up toplevel aggregate for a locally instantiated slice. 
#
sub SliceAggregate($$)
{
    my ($class, $slice) = @_;

    my $slice_uuid = $slice->uuid();
    my @result = ();

    my $query_result =
	DBQueryWarn("select idx from geni_aggregates ".
		    "where slice_uuid='$slice_uuid' and type='Aggregate'");
    return undef
	if (!$query_result);
    return undef
	if ($query_result->numrows != 1);

    my ($idx) = $query_result->fetchrow_array();
    my $aggregate = GeniAggregate->Lookup($idx);
    return undef
	if (!defined($aggregate));

    return $aggregate;
}

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#
# Look up a list of aggregates for a locally instantiated slice. 
# Used by the CM.
#
sub SliceAggregates($$$)
{
    my ($class, $slice, $pref) = @_;

    my $slice_uuid = $slice->uuid();
    my @result = ();

    my $query_result =
	DBQueryWarn("select idx from geni_aggregates ".
		    "where slice_uuid='$slice_uuid'");
    return -1
	if (!$query_result);

    while (my ($idx) = $query_result->fetchrow_array()) {
	my $aggregate = GeniAggregate->Lookup($idx);
	return -1
	    if (!defined($aggregate));
	push(@result, $aggregate);
    }
    @$pref = @result;
    return 0;
}

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#
# List of slivers for this aggregate.
#
sub SliverList($$)
{
    my ($self, $pref) = @_;
    my @result = ();
    
    return -1
	if (! (ref($self) && ref($pref)));

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    my $idx  = $self->idx();
    my $uuid = $self->uuid();
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    my $query_result =
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	DBQueryWarn("select idx from geni_slivers ".
		    "where aggregate_uuid='$uuid'");
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    return -1
	if (!$query_result);

    while (my ($sliver_idx) = $query_result->fetchrow_array()) {
	my $sliver = GeniSliver->Lookup($sliver_idx);
	if (!defined($sliver)) {
	    print STDERR "Could not find sliver object for $sliver_idx\n";
	    return -1;
	}
	push(@result, $sliver);
    }
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    #
    # And any aggregates that are children.
    #
    $query_result =
	DBQueryWarn("select idx from geni_aggregates ".
		    "where aggregate_idx='$idx'");
    return -1
	if (!$query_result);

    while (my ($aggregate_idx) = $query_result->fetchrow_array()) {
	my $aggregate = GeniAggregate->Lookup($aggregate_idx);
	if (!defined($aggregate_idx)) {
	    print STDERR
		"Could not find aggregate object for $aggregate_idx\n";
	    return -1;
	}
	push(@result, $aggregate);
    }
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    @$pref = @result;
    return 0;
    
}

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#
# Set the aggregate for an aggregate.
#
sub SetAggregate($$)
{
    my ($self, $aggregate) = @_;

    return -1
	if (! (ref($self) && ref($aggregate)));

    my $idx     = $self->idx();
    my $agg_idx = $aggregate->idx();

    return -1
	if (!DBQueryWarn("update geni_aggregates set ".
			 "  aggregate_idx='$agg_idx' ".
			 "where idx='$idx'"));
    
    $self->{'AGGREGATE'}->{'aggregate_idx'} = $agg_idx;
    $self->{'PARENT'} = $aggregate;
    return 0;
}

#
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# Get the aggregate for an aggregate.
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#
sub GetAggregate($)
{
    my ($self) = @_;

    return undef
	if (! ref($self));

    return $self->{'PARENT'} if (defined($self->{'PARENT'}));
    return undef
	if (!defined($self->aggregate_idx()));

    my $aggregate = GeniAggregate->Lookup($self->aggregate_idx());
    if (!defined($aggregate)) {
	print STDERR "Could not get aggregate object associated with $self\n";
	return undef;
    }
    $self->{'PARENT'} = $aggregate;
    return $aggregate;
}

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#
# Is object in the aggregate.
#
sub IsMember($$)
{
    my ($self, $object) = @_;

    return -1
	if (! (ref($self) && ref($object)));

    my $aggregate = $object->GetAggregate();
    return 0
	if (!$aggregate);
    return -1
	if ($self->idx() != $aggregate->idx());
    return 1;
}

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#
# Set the status for the aggregate
#
sub SetStatus($$)
{
    my ($self, $status) = @_;

    return undef
	if (! ref($self));

    my $idx = $self->idx();
    
    return -1
	if (!DBQueryWarn("update geni_aggregates set ".
			 "  status='$status' ".
			 "where idx='$idx'"));
    
    $self->{'AGGREGATE'}->{'status'} = $status;
    return 0;
}

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#
# Get the slice for the aggregate.
#
sub GetSlice($)
{
    my ($self) = @_;

    return undef
	if (! ref($self));

    return $self->{'SLICE'} if (defined($self->{'SLICE'}));

    if (!defined($self->slice_uuid())) {
	print STDERR "No slice associated with $self\n";
	return undef;
    }
    my $slice = GeniSlice->Lookup($self->slice_uuid());
    if (!defined($slice)) {
	print STDERR "Could not get slice object associated with $self\n";
	return undef;
    }
    $self->{'SLICE'} = $slice;
    return $slice;
}

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#
# Create a signed credential for this aggregate, issued to the provided user.
# The credential will grant all permissions for now.
#
# Should we store these credentials in the DB, recording what we hand out?
#
sub NewCredential($$)
{
    my ($self, $owner) = @_;

    return undef
	if (! (ref($self) && ref($owner)));

    my $credential = GeniCredential->Create($self, $owner);
    if (!defined($credential)) {
	print STDERR "Could not create credential for $self, $owner\n";
	return undef;
    }
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    if (defined($self->nickname())) {
	$credential->AddExtension("nickname", $self->nickname());
    }
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    if ($credential->Sign($self->GetCertificate()) != 0) {
	print STDERR "Could not sign credential for $self, $owner\n";
	return undef;
    }
    return $credential;
}

#
# Start all the slivers in the aggregate.
#
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sub Start($)
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{
    my ($self) = @_;

    return -1
	if (! ref($self));

    my @slivers = ();
    if ($self->SliverList(\@slivers) != 0) {
	print STDERR "Could not get sliver list for $self\n";
	return -1;
    }
    foreach my $sliver (@slivers) {
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	if ($sliver->Start() != 0) {
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	    print STDERR "Could not start $sliver in $self\n";
	    next;
	}
    }
    return 0;
}

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#
# Provision all the slivers in the aggregate.
#
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sub Provision($;$)
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{
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    my ($self, $extraargs) = @_;
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    return -1
	if (! ref($self));

    my @slivers = ();
    if ($self->SliverList(\@slivers) != 0) {
	print STDERR "Could not get sliver list for $self\n";
	return -1;
    }
    foreach my $sliver (@slivers) {
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	if ($sliver->Provision($extraargs) != 0) {
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	    print STDERR "Could not provision $sliver in $self\n";
	    next;
	}
    }
    return 0;
}

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#
# Unprovision all the slivers in the aggregate.
#
sub UnProvision($)
{
    my ($self) = @_;

    return -1
	if (! ref($self));

    my @slivers = ();
    if ($self->SliverList(\@slivers) != 0) {
	print STDERR "Could not get sliver list for $self\n";
	return -1;
    }
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    #
    # Might be an aggregate that includes link aggregates. Lets do those
    # first to avoid work when tearing down the nodes.
    #
    my @nonlinks = ();

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    foreach my $sliver (@slivers) {
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	if (! (ref($sliver) eq "GeniAggregate" and $sliver->type() eq "Link")){
	    push(@nonlinks, $sliver);
	    next;
	}
	if ($sliver->UnProvision() != 0) {
	    print STDERR "Could not unprovision $sliver in $self\n";
	    $sliver->SetStatus("broken");
	    next;
	}
    }
    foreach my $sliver (@nonlinks) {
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	if ($sliver->UnProvision() != 0) {
	    print STDERR "Could not unprovision $sliver in $self\n";
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	    $sliver->SetStatus("broken");
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	    next;
	}
    }
    return 0;
}

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############################################################################
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#
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# Link aggregates need special handling.
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#
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package GeniAggregate::Link;
use vars qw(@ISA);
@ISA = "GeniAggregate";

use GeniDB;
use GeniSlice;
use GeniCredential;
use GeniCertificate;
use GeniAggregate;
use Experiment;
use Interface;

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sub Create($$$)
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{
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    my ($class, $slice, $owner, $linkname) = @_;

    #
    # Form an hrn using the slicename and linkname
    #
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    my $hrn = "${PGENIDOMAIN}." . $slice->slicename() . "." . $linkname;
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    return GeniAggregate->Create($slice, $owner, "Link", $hrn, $linkname);
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}

#
# Provision all the slivers in the aggregate.
#
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sub Provision($;$)
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{
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    my ($self, $extraargs) = @_;
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    return -1
	if (! ref($self));

    my @slivers = ();
    if ($self->SliverList(\@slivers) != 0) {
	print STDERR "Could not get sliver list for $self\n";
	return -1;
    }
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    my $experiment = Experiment->Lookup($self->slice_uuid());
    if (!defined($experiment)) {
	print STDERR "Could not map $self to its experiment\n";
	return -1;
    }

    my $vlan = VLan->Create($experiment, $self->uuid());
    if (!defined($vlan)) {
	print STDERR "Could not create vlan for $self\n";
	goto bad;
    }
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    foreach my $sliver (@slivers) {
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	my $interface = Interface->LookupByUUID($sliver->uuid());
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	if (! defined($interface)) {
	    print STDERR "Could not map $sliver to its interface object\n";
	    goto bad;
	}
	if (! $vlan->AddMember($interface->node_id(), $interface->iface())) {
	    print STDERR "$self: Could not add $interface to $vlan\n";
	    goto bad;
	}
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    }
    if ($vlan->Instantiate() != 0) {
	print STDERR "$self: Could not instantiate $vlan on switches\n";
	goto bad;
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    }
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    $self->SetStatus("ready");
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    return 0;

  bad:
    $vlan->UnInstantiate()
	if (defined($vlan));
    $vlan->Destroy()
	if (defined($vlan));
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    return -1
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}
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#
# Unprovision all the slivers in the aggregate.
#
sub UnProvision($)
{
    my ($self) = @_;

    return -1
	if (! ref($self));

    my @slivers = ();
    if ($self->SliverList(\@slivers) != 0) {
	print STDERR "Could not get sliver list for $self\n";
	return -1;
    }
    my $experiment = Experiment->Lookup($self->slice_uuid());
    if (!defined($experiment)) {
	print STDERR "Could not map $self to its experiment\n";
	return -1;
    }
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    my $vlan = VLan->Lookup($experiment, $self->uuid());
    if (! defined($vlan)) {
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	print STDERR "No vlan associated with $self\n";
	return 0;
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    }
    if ($vlan->UnInstantiate() != 0) {
	print STDERR "Could not uninstantiate $vlan\n";
	return -1;
    }
    if ($vlan->Destroy() != 0) {
	print STDERR "Could not destroy $vlan\n";
	return -1;
    }
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    return 0;
}

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#
# Nothing to do yet.
#
sub Start($)
{
    my ($self) = @_;

    return -1
	if (! ref($self));

    return 0;
}

#
# Nothing to do yet.
#
sub Stop($)
{
    my ($self) = @_;

    return -1
	if (! ref($self));

    return 0;
}


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############################################################################
#
# Tunnel aggregates need special handling too
#
package GeniAggregate::Tunnel;
use vars qw(@ISA);
@ISA = "GeniAggregate";

use GeniDB;
use GeniSlice;
use GeniCredential;
use GeniCertificate;
use GeniRegistry;
use GeniAggregate;
use Experiment;
use Interface;
use Data::Dumper;

sub Create($$$$$$)
{
    my ($class, $slice, $owner, $node1sliver, $node2sliver, $rspec) = @_;
    my $clearinghouse;

    my $linkname = $rspec->{'nickname'};
    return undef
	if (!defined($linkname));

    my $experiment = Experiment->Lookup($slice->uuid());
    if (!defined($experiment)) {
	print STDERR "Could not map $slice to its experiment\n";
	return -1;
    }

    #
    # Form an hrn using the slicename and linkname
    #
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    my $hrn = "${PGENIDOMAIN}." . $slice->slicename() . "." . $linkname;
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    my $aggregate = GeniAggregate->Create($slice, $owner, "Tunnel",
					  $hrn, $linkname);
    goto bad
	if (!defined($aggregate));

    #
    # Create a tunnel entry in the lans table.
    #
    my $tunnel = Tunnel->Create($experiment, $aggregate->uuid(), "", "gre");
    if (!defined($tunnel)) {
	print STDERR "Could not create tunnel entry in lans table\n";
	return undef;
    }

    my $node1ref = (@{$rspec->{'linkendpoints'}})[0];
    my $node2ref = (@{$rspec->{'linkendpoints'}})[1];

    # These are the ips of the tunnel.
    my $ip1      = $node1ref->{'tunnel_ip'};
    my $ip2      = $node2ref->{'tunnel_ip'};
    my $ctrlip1;
    my $ctrlip2;
    my $iface1;
    my $iface2;

    # We need the control network addresses, but it is possible that
    # one of the nodes is not on this testbed.
    if (defined($node1sliver)) {
	my $node1 = Node->Lookup($node1ref->{'node_uuid'});
	my $interface = Interface->LookupControl($node1);
	goto bad
	    if (!defined($interface));
	$ctrlip1 = $interface->IP();
	$iface1  = $tunnel->AddMember($node1);
	if (!defined($iface1)) {
	    print STDERR "Could not add $node1 to $tunnel\n";
	    goto bad;
	}
    }
    else {
	#
	# Need to ask the clearinghouse where this node comes from.
	#
	$clearinghouse = GeniRegistry::ClearingHouse->Create();
	
	my $blob;
	if ($clearinghouse->Resolve($node1ref->{'node_uuid'},
				    "Component", \$blob) != 0) {
	    print STDERR "Could not lookup node at clearinghouse\n";
	    goto bad;
	}
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	my $certificate = GeniCertificate->LoadFromString($blob->{'gid'});
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	goto bad
	    if (!defined($certificate));
	
	my $component = GeniComponent->Lookup($certificate->uuid());
	if (!defined($component)) {
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	    $component = GeniComponent->CreateFromCertificate($certificate);
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	    if (!defined($component)) {
		print STDERR "Could not create component from $certificate\n";
		goto bad;
	    }
	}
	my $credential = GeniRegistry::Client->CreateCredential($component);
	if (!defined($credential)) {
	    print STDERR "Could not create a credential for $component\n";
	    goto bad;

	}
	my $registry = GeniRegistry::Client->Create($component, undef,
						    $credential);
	if (!defined($registry)) {
	    print STDERR "Could not create a registry client for $component\n";
	    goto bad;
	}
	$registry->Resolve($node1ref->{'node_uuid'}, "Node", \$blob);

	foreach my $ref (@{ $blob->{'interfaces'} }) {
	    $ctrlip1 = $ref->{'IP'}
	        if ($ref->{'role'} eq "ctrl");
	}
    }
    if (defined($node2sliver)) {
	my $node2 = Node->Lookup($node2ref->{'node_uuid'});
	my $interface = Interface->LookupControl($node2);
	goto bad
	    if (!defined($interface));
	$ctrlip2 = $interface->IP();
	$iface2  = $tunnel->AddMember($node2);
	if (!defined($iface2)) {
	    print STDERR "Could not add $node2 to $tunnel\n";
	    goto bad;
	}
    }
    else {
	#
	# Need to ask the clearinghouse where this node comes from.
	#
	$clearinghouse = GeniRegistry::ClearingHouse->Create()
	    if (!defined($clearinghouse));
	
	my $blob;
	if ($clearinghouse->Resolve($node2ref->{'node_uuid'},
				    "Component", \$blob) != 0) {
	    print STDERR "Could not lookup node at clearinghouse\n";
	    goto bad;
	}
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	my $certificate = GeniCertificate->LoadFromString($blob->{'gid'});
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	goto bad
	    if (!defined($certificate));
	
	my $component = GeniComponent->Lookup($certificate->uuid());
	if (!defined($component)) {
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	    $component = GeniComponent->CreateFromCertificate($certificate);
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	    if (!defined($component)) {
		print STDERR "Could not create component from $certificate\n";
		goto bad;
	    }
	}
	my $credential = GeniRegistry::Client->CreateCredential($component);
	if (!defined($credential)) {
	    print STDERR "Could not create a credential for $component\n";
	    goto bad;

	}
	my $registry = GeniRegistry::Client->Create($component, undef,
						    $credential);
	if (!defined($registry)) {
	    print STDERR "Could not create a registry client for $component\n";
	    goto bad;
	}
	$registry->Resolve($node2ref->{'node_uuid'}, "Node", \$blob);

	foreach my $ref (@{ $blob->{'interfaces'} }) {
	    $ctrlip2 = $ref->{'IP'}
	        if ($ref->{'role'} eq "ctrl");
	}
    }
    print STDERR "$ip1, $ip2, $ctrlip1, $ctrlip2\n";

    if (defined($iface1)) {
	$iface1->SetAttribute("tunnel_ip", $ip1);
	$iface1->SetAttribute("tunnel_peerip", $ip2);
	$iface1->SetAttribute("tunnel_srcip", $ctrlip1);
	$iface1->SetAttribute("tunnel_dstip", $ctrlip2);
	$iface1->SetAttribute("tunnel_ipmask", "255.255.255.0");
	$iface1->SetAttribute("tunnel_lan", $linkname);
	$iface1->SetAttribute("tunnel_unit", $iface1->memberid());
	$iface1->SetAttribute("tunnel_style", "gre");
    }
    if (defined($iface2)) {
	$iface2->SetAttribute("tunnel_ip", $ip2);
	$iface2->SetAttribute("tunnel_peerip", $ip1);
	$iface2->SetAttribute("tunnel_srcip", $ctrlip2);
	$iface2->SetAttribute("tunnel_dstip", $ctrlip1);
	$iface2->SetAttribute("tunnel_ipmask", "255.255.255.0");
	$iface2->SetAttribute("tunnel_lan", $linkname);
	$iface2->SetAttribute("tunnel_unit", $iface2->memberid());
	$iface2->SetAttribute("tunnel_style", "gre");
    }
    return $aggregate;

  bad:
    $tunnel->Destroy()
	if (defined($tunnel));
    $aggregate->Delete()
	if (defined($aggregate));
    return undef;
}

#
# All the work done above.
#
sub Provision($)
{
    my ($self) = @_;

    return -1
	if (! ref($self));

    $self->SetStatus("ready");
    return 0;
}

#
# Destroy the underlying tunnel in the lans table.
#
sub UnProvision($)
{
    my ($self) = @_;

    return -1
	if (! ref($self));

    my $experiment = Experiment->Lookup($self->slice_uuid());
    if (!defined($experiment)) {
	print STDERR "Could not map $self to its experiment\n";
	return -1;
    }

    my $tunnel = Tunnel->Lookup($experiment, $self->uuid());
    if (! defined($tunnel)) {
	print STDERR "No tunnel associated with $self\n";
	return 0;
    }
    if ($tunnel->Destroy() != 0) {
	print STDERR "Could not destroy $tunnel\n";
	return -1;
    }
    return 0;
}

#
# Nothing to do yet.
#
sub Start($)
{
    my ($self) = @_;

    return -1
	if (! ref($self));

    return 0;
}

#
# Nothing to do yet.
#
sub Stop($)
{
    my ($self) = @_;

    return -1
	if (! ref($self));

    return 0;
}


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# _Always_ make sure that this 1 is at the end of the file...
1;