#!/usr/bin/perl
#
# Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
# Yokogawa Electric Corporation.
# All rights reserved.
# 
# Redistribution and use of this software in source and binary
# forms, with or without modification, are permitted provided that
# the following conditions and disclaimer are agreed and accepted
# by the user:
# 
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in
#    the documentation and/or other materials provided with
#    the distribution.
# 
# 3. Neither the names of the copyrighters, the name of the project
#    which is related to this software (hereinafter referred to as
#    "project") nor the names of the contributors may be used to
#    endorse or promote products derived from this software without
#    specific prior written permission.
# 
# 4. No merchantable use may be permitted without prior written
#    notification to the copyrighters.
# 
# 5. The copyrighters, the project and the contributors may prohibit
#    the use of this software at any time.
# 
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHTERS, THE PROJECT AND
# CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING
# BUT NOT LIMITED THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.  IN NO EVENT SHALL THE
# COPYRIGHTERS, THE PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
# IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# $Id: IKEv2-SGW-I-1-1-3-2-A.seq,v 1.3 2008/11/28 10:16:25 doo Exp $
#
################################################################

BEGIN
{
	push(@INC, '..');
        $ENV{'V6EVAL_WITH_KOI'} = 'TRUE';
}

END {}

use V6evalTool;
use IKEv2v6eval;
use IKEv2;
use strict;



my $remote	= 'common_remote_index';
my $selector	= 'common_selector_index_outbound';

my $session	= undef;
my $ret	= undef;
my $str = undef;

my $ike_sa_init_req_param	= undef;
my $ike_sa_init_resp_param	= undef;
my $ike_auth_req_param	= undef;
my $ike_auth_resp_param	= undef;
my $informational_req_param = undef;

my $material	= undef;
my $child_sa_material = undef;

my @local_informational_req = undef;



#--------------------------------------#
# prepare IKE_AUTH request             #
#--------------------------------------#
my $common_exp_ike_auth_req = $exp_ike_auth_req->{'common_remote_index'};
my @local_ike_auth_req = @{$common_exp_ike_auth_req};
# remove N(USE_TRANSPORT_MODE)
foreach my $payload (@local_ike_auth_req) {
        if ($payload->{'self'} eq 'E') {
                my @payloads = grep {
                                my $ret = 0;
                                if ($_->{'self'} ne 'N') { $ret = 1; }
                                if ($_->{'type'} ne 'USE_TRANSPORT_MODE') { $ret = 1; }
                                $ret;
                        } @{$payload->{'innerPayloads'}};

                $payload->{'innerPayloads'} = \@payloads;
        }
}
# set correct nexttype
for (my $i = 0; $i < scalar(@local_ike_auth_req); $i++) {
        my $payload = $local_ike_auth_req[$i];

        if ($payload->{'self'} eq 'E') {
                for (my $j = 0; $j < scalar(@{$payload->{'innerPayloads'}}); $j++) {
                        my $cur = $payload->{'innerPayloads'}->[$j];
                        my $next = $payload->{'innerPayloads'}->[$j+1];
                        unless (defined($next)) {
                                $cur->{'nexttype'} = '0';
                                next;
                        }
                        if ($cur->{'nexttype'} eq $next->{'self'}) {
                                next;
                        }
                        $cur->{'nexttype'} = $next->{'self'};
                }

                next;
        }

}
$exp_ike_auth_req->{'SGW_I_IKE_AUTH_REQ'} = \@local_ike_auth_req;



#--------------------------------------#
# prepare IKE_AUTH response            #
#--------------------------------------#
my $common_gen_ike_auth_resp = $gen_ike_auth_resp->{'common_remote_index'};
my @local_ike_auth_resp = @{$common_gen_ike_auth_resp};
# remove N(USE_TRANSPORT_MODE)
@local_ike_auth_resp = grep {
                my $ret = 0;
                if ($_->{'self'} ne 'N') { $ret = 1; }
                if ($_->{'type'} ne 'USE_TRANSPORT_MODE') { $ret = 1; }
                $ret;
        } @local_ike_auth_resp;
                                
$gen_ike_auth_resp->{'SGW_I_IKE_AUTH_RESP'} = \@local_ike_auth_resp;



kLogHTML('<FONT COLOR="#FF0000" SIZE="+1"><U><B>TEST SETUP</B></U></FONT>');



#------------------------------#
# register IKEv2.pm            #
#------------------------------#
unless(IKEv2initialize('SGW', 'SGW')) {
	IKEv2exitFatal('<FONT COLOR="#ff0000">IKEv2 module initializing failure</FONT>');
}



#------------------------------#
# configure TN                 #
#------------------------------#
unless(IKEv2setupTN()) {
	IKEv2exitFatal('<FONT COLOR="#ff0000">TN setup failure</FONT>');
}



#------------------------------#
# configure NUT                #
#------------------------------#
unless(IKEv2setupNUT()) {
	IKEv2exitFatal('<FONT COLOR="#ff0000">NUT setup failure</FONT>');
}



kLogHTML('<FONT COLOR="#FF0000" SIZE="+1"><U><B>TEST PROCEDURE</B></U></FONT>');


#------------------------------#
# prepare session handler      #
#------------------------------#
$session = IKEv2create_session($remote);
unless(defined($session)) {
	IKEv2exitFatal('<FONT COLOR="#ff0000">IKEv2 session creation failure</FONT>');
}



$str  = '<PRE>';
$str .= "    (I)             (R)\n";
$str .= "    NUT             TN1\n";
$str .= "     |               |\n";
$str .= "     |-------------->| IKE_SA_INIT request (HDR, SAi1, KEi, Ni)\n";
$str .= "     |               |\n";
$str .= "     V               V";
$str .= '</PRE>';

kLogHTML($str);



#--------------------------------------#
# invoke IKE_SA_INIT request           #
#--------------------------------------#
unless(IKEv2initiateNUT($selector)) {
	IKEv2exitFatal('<FONT COLOR="#ff0000">NUT initiation failure</FONT>');
}



#--------------------------------------#
# receive IKE_SA_INIT request          #
#--------------------------------------#
$ike_sa_init_req_param = devel_IKEv2receive_IKE_SA_INIT_request($session, $remote);
unless(defined($ike_sa_init_req_param)) {
	kLogHTML(kDump_Common_Error());
	kLogHTML('<FONT COLOR="#ff0000">Can\'t observe IKE_SA_INIT request.</FONT>');
	IKEv2exitFail();
}



#--------------------------------------#
# send IKE_SA_INIT response            #
#--------------------------------------#
$str  = '<PRE>';
$str .= "    (I)             (R)\n";
$str .= "    NUT             TN1\n";
$str .= "     |               |\n";
$str .= "     |<--------------| IKE_SA_INIT response (HDR, SAr1, KEr, Nr)\n";
$str .= "     |               |\n";
$str .= "     V               V";
$str .= '</PRE>';

kLogHTML($str);


$ike_sa_init_resp_param = devel_IKEv2send_IKE_SA_INIT_response($session, $remote, $ike_sa_init_req_param);
unless(defined($ike_sa_init_resp_param)) {
	kLogHTML(kDump_Common_Error());
	IKEv2exitFatal('<FONT COLOR="#ff0000">Can\'t send IKE_SA_INIT response.</FONT>');
}



#--------------------------------------#
# generate keying material             #
#--------------------------------------#
$material = devel_IKEv2gen_keymat(0, $ike_sa_init_req_param, $ike_sa_init_resp_param);
unless(defined($material)) {
	kLogHTML(kDump_Common_Error());
	IKEv2exitFatal('<FONT COLOR="#ff0000">Can\'t generate keying material.</FONT>');
}



#--------------------------------------#
# receive IKE_AUTH request             #
#--------------------------------------#
$str  = '<PRE>';
$str .= "    (I)             (R)\n";
$str .= "    NUT             TN1\n";
$str .= "     |               |\n";
$str .= "     |-------------->| IKE_AUTH request (HDR, SK {IDi, AUTH, SAi2, TSi, TSr})\n";
$str .= "     |               |\n";
$str .= "     V               V";
$str .= '</PRE>';

kLogHTML($str);


$ike_auth_req_param = devel_IKEv2receive_IKE_AUTH_request($session,
							  'SGW_I_IKE_AUTH_REQ',
							  $ike_sa_init_req_param,
							  $ike_sa_init_resp_param,
							  $material);
unless(defined($ike_auth_req_param)) {
	kLogHTML(kDump_Common_Error());
	kLogHTML('<FONT COLOR="#ff0000">Can\'t observe IKE_AUTH request.</FONT>');
	IKEv2exitFail();
}



#--------------------------------------#
# send IKE_AUTH response               #
#--------------------------------------#
$str  = '<PRE>';
$str .= "    (I)             (R)\n";
$str .= "    NUT             TN1\n";
$str .= "     |               |\n";
$str .= "     |<--------------| IKE_AUTH response (HDR, SK {IDr, AUTH, SAr2, TSi, TSr})\n";
$str .= "     |               |\n";
$str .= "     V               V";
$str .= '</PRE>';

kLogHTML($str);


$ike_auth_resp_param = devel_IKEv2send_IKE_AUTH_response($session,
							 'SGW_I_IKE_AUTH_RESP',
							 $ike_sa_init_req_param,
							 $ike_sa_init_resp_param,
							 $material);
unless (defined($ike_auth_resp_param)) {
	kLogHTML(kDump_Common_Error());
	IKEv2exitFatal('<FONT COLOR="#ff0000">Can\'t send IKE_AUTH response.</FONT>');
}



#--------------------------------------#
# generate keying material (CHILD_SA)  #
#--------------------------------------#
$child_sa_material = devel_IKEv2gen_child_sa_keymat(1,	# Initial Exchanges
						    $material,
						    $ike_sa_init_req_param,
						    $ike_sa_init_resp_param,
						    $ike_auth_req_param,
						    $ike_auth_resp_param);



#--------------------------------------#
# set Upper Protocol for TN's SPD      #
#--------------------------------------#
IKEv2set_SPD('upperspec', 'icmp6');



#--------------------------------------#
# set keying material                  #
#--------------------------------------#
$ret = IKEv2set_child_sa_keymat(0, $child_sa_material, $ike_auth_req_param, $ike_auth_resp_param);
unless($ret) {
	kLogHTML(kDump_Common_Error());
	IKEv2exitFatal('<FONT COLOR="#ff0000">Can\'t set keying material.</FONT>');
}



#--------------------------------------#
# prepare ICMP session handler         #
#--------------------------------------#
my $icmp_session_th2 = ICMPcreate_session('TH2sendtoTH1');
unless(defined($icmp_session_th2)) {
        IKEv2exitFatal('<FONT COLOR="#ff0000">ICMP session creation failure</FONT>');
}

my $icmp_session_th1 = ICMPcreate_session('TH1sendtoTH2');
unless(defined($icmp_session_th1)) {
        IKEv2exitFatal('<FONT COLOR="#ff0000">ICMP session creation failure</FONT>');
}



#--------------------------------------#
# receive Echo Reply (DUMMY)           #
#--------------------------------------#
$icmp_session_th1->timeout(1);
$ret = ICMPreceive($icmp_session_th1);
$icmp_session_th1->timeout(12);



#--------------------------------------#
# send Echo Reply (TH2-->TN1==>NUT)    #
#--------------------------------------#
$str  = '<PRE>';
$str .= "                    (I)             (R)\n";
$str .= "    TH1             NUT             TN1             TH2\n";
$str .= "     |               |               |               |\n";
$str .= "     |<--------------+===============+---------------| IPsec {Echo Reply}\n";
$str .= "     |               |               |               |\n";
$str .= "     V               V               V               V";
$str .= '</PRE>';

kLogHTML($str);

$ret = ICMPsend($icmp_session_th2, 'echo_reply');
unless (defined($ret)) {
        kLogHTML(kDump_Common_Error());
        IKEv2exitFatal('<FONT COLOR="#ff0000">Can\'t send ICMP packet.</FONT>');
}



#--------------------------------------#
# receive Echo Reply (NUT-->TH1)       #
#--------------------------------------#
$ret = ICMPreceive($icmp_session_th1);
unless(defined($ret)) {
        my $strerror = kDump_Common_Error();
        kLogHTML('<FONT COLOR="#ff0000">Can\'t observe ICMP packet.</FONT>');
        IKEv2exitFail();
}

#--------------------------------------#
# send Echo Reply (TH1-->NUT)          #
#--------------------------------------#
$str  = '<PRE>';
$str .= "                    (I)             (R)\n";
$str .= "    TH1             NUT             TN1             TH2\n";
$str .= "     |               |               |               |\n";
$str .= "     |---------------+===============+-------------->| IPsec {Echo Reply}\n";
$str .= "     |               |               |               |\n";
$str .= "     V               V               V               V";
$str .= '</PRE>';

kLogHTML($str);

$ret = ICMPsend_v6eval('TH1sendtoTH2', 'echo_reply');
unless (defined($ret)) {
        kLogHTML(kDump_Common_Error());
        IKEv2exitFatal('<FONT COLOR="#ff0000">Can\'t send ICMP packet.</FONT>');
}



#--------------------------------------#
# receive Echo Reply (NUT==>tn1-->TH2) #
#--------------------------------------#
$ret = ICMPreceive($icmp_session_th2);
unless(defined($ret)) {
        my $strerror = kDump_Common_Error();
        kLogHTML('<FONT COLOR="#ff0000">Can\'t observe ICMP packet.</FONT>');
        IKEv2exitFail();
}



#--------------------------------------#
# prepare (no encryption)IKE message   #
#--------------------------------------#
my $invalid_spi_notify = 
{	# Notify Payload
	'self'		=> 'N',	     # *** MUST BE HERE ***
	'nexttype'	=> undef,    # Next Payload
	'critical'	=> undef,    # Critical
	'reserved'	=> undef,    # RESERVED
	'length'	=> undef,    # Payload Length
	'id'		=> '3',	   # Protocol ID
	'spiSize'	=> undef,    # SPI Size
	'type'		=> 'INVALID_SPI',   # Notify Type
	'spi'		=> undef,    # SPI
	'data'		=> undef,    # Notification Data
};
my $common_informational_req = $gen_informational_req->{'common_remote_index'};
@local_informational_req = @{$common_informational_req};
# delete Encryption payload & add Notify payload
for (my $i = 0; $i < scalar(@local_informational_req); $i++) {
	if ($local_informational_req[$i]->{'self'} eq 'E') {
		splice(@local_informational_req, $i);
		push(@local_informational_req, $invalid_spi_notify);
		last;
	}
}
$gen_informational_req->{'SGW-I-1-1-3-2.1'} = \@local_informational_req;



#--------------------------------------#
# send IKE message                     #
#--------------------------------------#
$str  = '<PRE>';
$str .= "    (I)             (R)\n";
$str .= "    NUT             TN1\n";
$str .= "     |               |\n";
$str .= "     |<--------------| cryptographically unprotected IKE message\n";
$str .= "     |               |\n";
$str .= "     V               V";
$str .= '</PRE>';

kLogHTML($str);



$informational_req_param = devel_IKEv2send_INFORMATIONAL_request($session,
                                                                 'SGW-I-1-1-3-2.1',
                                                                 $ike_sa_init_req_param,
                                                                 $ike_sa_init_resp_param,
                                                                 $ike_auth_resp_param,
                                                                 $material);
unless (defined($informational_req_param)) {
        kLogHTML(kDump_Common_Error());
        IKEv2exitFatal('<FONT COLOR="#ff0000">Can\'t send INFORMATIONAL request.</FONT>');
}



#--------------------------------------#
# send Echo Reply (TH2-->TN1==>NUT)    #
#--------------------------------------#
$str  = '<PRE>';
$str .= "                    (I)             (R)\n";
$str .= "    TH1             NUT             TN1             TH2\n";
$str .= "     |               |               |               |\n";
$str .= "     |<--------------+===============+---------------| IPsec {Echo Reply}\n";
$str .= "     |               |               |               |\n";
$str .= "     V               V               V               V";
$str .= '</PRE>';

kLogHTML($str);

$ret = ICMPsend($icmp_session_th2, 'echo_reply');
unless (defined($ret)) {
        kLogHTML(kDump_Common_Error());
        IKEv2exitFatal('<FONT COLOR="#ff0000">Can\'t send ICMP packet.</FONT>');
}



#--------------------------------------#
# receive Echo Reply (NUT-->TH1)       #
#--------------------------------------#
$ret = ICMPreceive($icmp_session_th1);
unless(defined($ret)) {
        my $strerror = kDump_Common_Error();
        kLogHTML('<FONT COLOR="#ff0000">Can\'t observe ICMP packet.</FONT>');
        IKEv2exitFail();
}

#--------------------------------------#
# send Echo Reply (TH1-->NUT)          #
#--------------------------------------#
$str  = '<PRE>';
$str .= "                    (I)             (R)\n";
$str .= "    TH1             NUT             TN1             TH2\n";
$str .= "     |               |               |               |\n";
$str .= "     |---------------+===============+-------------->| IPsec {Echo Reply}\n";
$str .= "     |               |               |               |\n";
$str .= "     V               V               V               V";
$str .= '</PRE>';

kLogHTML($str);

$ret = ICMPsend_v6eval('TH1sendtoTH2', 'echo_reply');
unless (defined($ret)) {
        kLogHTML(kDump_Common_Error());
        IKEv2exitFatal('<FONT COLOR="#ff0000">Can\'t send ICMP packet.</FONT>');
}



#--------------------------------------#
# receive Echo Reply (NUT==>tn1-->TH2) #
#--------------------------------------#
$ret = ICMPreceive($icmp_session_th2);
unless(defined($ret)) {
        my $strerror = kDump_Common_Error();
        kLogHTML('<FONT COLOR="#ff0000">Can\'t observe ICMP packet.</FONT>');
        IKEv2exitFail();
}



#--------------------------------------#
# exit with cleanup                    #
#--------------------------------------#
IKEv2exitPass();



#
# perldoc
#
########################################################################
__END__

=head1 Title

  Test IKEv2.SGW.I.1.1.3.2: State Synchronization with IKE messages
  Part A: (BASIC)

=head1 Purpose

  To verify an IKEv2 device synchronizes its state when it receives IKE messages.

=head1 References

  * [RFC 4306] - Sections 2.1, 2.2 and 2.4

=head1 Test Setup

  * Network Topology
     Connect the devices according to the Common Topology.
  * Configuration
     In each part, configure the devices according to the Common Configuration. 
  * Pre-Sequence and Cleanup Sequence
     IKEv2 on the NUT is disabled after each part.

=head1 Procedure

=begin html

<BLOCKQUOTE>
<PRE>

   TH1            NUT           TN1           TH2
 (HOST)          (SGW)         (SGW)         (Host)
    |              |             |             |
    |              |------------>|             | IKE_SA_INIT request (HDR, SAi1, KEi, Ni)
    |              |             |             | (Judgement #1)
    |              |<------------|             | IKE_SA_INIT Response (HDR, SAr1, KEr, Nr)
    |              |             |             | (Packet #1)
    |              |             |             |
    |              |------------>|             | IKE_AUTH request (HDR, SK {IDi, AUTH, SAi2, TSi, TSr})
    |              |             |             | (Judgement #2)
    |              |<------------|             | IKE_AUTH Response (HDR, SK {IDr, AUTH, SAr2, TSi, TSr})
    |              |             |             | (Packet #2)
    |              |             |             |
    |<-------------+=============+-------------| IPSec {Echo Request}
    |              |             |             | (Packet #3) (Judgement #3)
    |--------------+=============+------------>| IPSec {Echo Reply}
    |              |             |             | (Packet #4) (Judgement #4)
    |              |             |             |
    |              |<------------|             | INFORMATIONAL request (HDR, N(INVALID_SPI))
    |              |             |             | (Packet #5)
    |              |             |             |
    |<-------------+=============+-------------| IPSec {Echo Request}
    |              |             |             | (Packet #6) (Judgement #5)
    |--------------+=============+------------>| IPSec {Echo Reply}
    |              |             |             | (Packet #7) (Judgement #6)
    |              |             |             |
    V              V             V             V<br>

</BLOCKQUOTE>

<BLOCKQUOTE>
<TABLE BORDER>
<TR>
<TD><TT>Packet #1</TT></TD>
<TD><TT>See Common Packet #2</TT></TD>
</TR>
<TR>
<TD><TT>Packet #2</TT></TD>
<TD><TT>See Common Packet #6</TT></TD>
</TR>
<TR>
<TD><TT>Packet #3</TT></TD>
<TD><TT>See Common Packet #21</TT></TD>
</TR>
<TR>
<TD><TT>Packet #4</TT></TD>
<TD><TT>See Common Packet #25</TT></TD>
</TR>
<TR>
<TD><TT>Packet #5</TT></TD>
<TD><TT>See below</TT></TD>
</TR>
<TR>
<TD><TT>Packet #6</TT></TD>
<TD><TT>See Common Packet #21</TT></TD>
</TR>
<TR>
<TD><TT>Packet #7</TT></TD>
<TD><TT>See Common Packet #25</TT></TD>
</TR>
</TABLE>
</BLOCKQUOTE>
<br>

<BLOCKQUOTE>
<TABLE BORDER>
<TR>  
<TD rowspan="2">IPv6 Header</TD>
<TD>Source Address</TD>
<TD>TN1's Global Address on Link A</TD>
</TR>
<TR>
<TD>Destination Address</TD>
<TD>NUT's Global Address on Link X</TD>
</TR>

<TR>
<TD rowspan="2">UDP Header</TD>
<TD>Source Port</TD>   
<TD>500</TD>
</TR>
<TR>
<TD>Destination Port</TD>
<TD>500</TD>
</TR>

<TR>
<TD rowspan="13">IKEv2 Header</TD>
<TD>IKE_SA Initiator's SPI</TD>
<TD>any</TD>
</TR>
<TR>
<TD>IKE_SA Responder's SPI</TD>
<TD>any</TD>
</TR>
<TR>
<TD>Next Payload</TD>
<TD>41(N)</TD>
</TR>
<TR>
<TD>Major Version</TD>
<TD>2</TD>
</TR>
<TR>
<TD>Minor Version</TD>
<TD>0</TD>
</TR>
<TR>
<TD>Exchange Type</TD>
<TD>37(INFORMATIONAL)</TD>
</TR>
<TR>
<TD>X (bits 0-2 of Flags)</TD>
<TD>0</TD>
</TR>
<TR>
<TD>I (bit 3 of Flags)</TD>
<TD>any</TD>
</TR>
<TR>
<TD>V (bit 4 of Flags)</TD>
<TD>0</TD>
</TR>
<TR>
<TD>R (bit 5 of Flags)</TD>
<TD>0</TD>
</TR>
<TR>
<TD>X (bits 6-7 Flags)</TD>
<TD>0</TD>
</TR>
<TR>
<TD>Message ID</TD>
<TD>any</TD>
</TR>
<TR>
<TD>Length</TD>
<TD>any</TD>
</TR>

<TR>
<TD rowspan="7">N Payload</TD>
<TD>Next Payload</TD>
<TD>0</TD>
</TR>
<TR>
<TD>Critical</TD>
<TD>0</TD>
</TR>
<TR>
<TD>Reserved</TD>
<TD>0</TD>
</TR>
<TR>
<TD>Payload Length</TD>
<TD>8</TD>
</TR>
<TR>
<TD>Protocol ID</TD>
<TD>3(ESP)</TD>
</TR>
<TR>
<TD>SPI Size</TD>
<TD>0</TD>
</TR>
<TR>
<TD>Notify Message Type</TD>
<TD>11(INVALID_SPI)</TD>
</TR>

</TABLE>
</BLOCKQUOTE>

=end html

  Part A: (BASIC)
     1. NUT starts to negotiate with TN1 by sending IKE_SA_INIT request.
     2. Observe the messages transmitted on Link A.
     3. TN1 responds with an IKE_SA_INIT response to the NUT.
     4. Observe the messages transmitted on Link A.
     5. After reception of IKE_AUTH request from the NUT, TN1 responds with an IKE_AUTH
         response to the NUT
     6. TH2 transmits an Echo Request to TH1.
     7. Observe the messages transmitted on Link B.
     8. TH1 transmits an Echo Reply to TH2.
     9. Observe the messages transmitted on Link A.
     10. TN1 transmits INFORMATIONAL request with a Notify payload of type INVALID_ SPI to
         the NUT.
     11. TH2 transmits an Echo Request to TH1.
     12. Observe the messages transmitted on Link B.
     13. TH1 transmits an Echo Reply to TH2.
     14. Observe the messages transmitted on Link A.

=head1 Observable Result

  Part A
       Step 2: Judgment #1
       The NUT transmits an IKE_SA_INIT request including "ENCR_3DES",
       "PRF_HMAC_SHA1", "AUTH_HMAC_SHA1_96" and "D-H group 2" as proposed
       algorithms.

       Step 4: Judgment #2
       The NUT transmits an IKE_AUTH request including "ENCR_3DES",
       "AUTH_HMAC_SHA1_96" and "No Extended Sequence Numbers" as proposed
       algorithms.

       Step 7: Judgment #3
       The NUT forwards an Echo Request.

       Step 9: Judgment #4
       The NUT forwards an Echo Reply with IPsec ESP using corresponding algorithms.

       Step 12: Judgment #5
       The NUT forwards an Echo Request.

       Step 14: Judgment #6
       The NUT forwards an Echo Reply with IPsec ESP using corresponding algorithms.

=head1 Possible Problems

  * None.

=cut


