#!/usr/bin/perl # # Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005 Yokogawa Electric Corporation, # IPA (Information-technology Promotion Agency, Japan). # 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. However, using this software for the # purpose of testing or evaluating any products including merchantable # products may be permitted without any notification to the copyrighters. # # # # 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. # # $TAHI: ct/natpt/rfc2765_4.1_hoplimit.seq,v 1.4 2001/10/11 01:41:47 akisada Exp $ # BEGIN { $V6evalTool::TestVersion = '$Name: REL_2_1_2 $'; } use V6evalTool; use natpt; checkNUT(router); # Interface $IF="Link0"; $IF1="Link1"; vCapture($IF); vCapture($IF1); %pktdesc = ( icmp6_hoplimit_255 => 'Send IPv6 ICMP packet Hop Limit = 254', icmp4_ttl_254 => 'Recv IPv4 ICMP packet with TTL = 255', icmp6_hoplimit_64 => 'Send IPv6 ICMP packet Hop Limit = 63', icmp4_ttl_63 => 'Recv IPv4 ICMP packet with TTL = 64', icmp6_hoplimit_2 => 'Send IPv6 ICMP packet Hop Limit = 1', icmp4_ttl_1 => 'Recv IPv4 ICMP packet with TTL = 2', icmp6_hoplimit_1 => 'Send IPv6 ICMP packet Hop Limit = 1', icmp6_hoplimit_1_exceed => 'Recv IPv6 ICMP Time Exceeded (Hop Limit = 1)', arp_nut2tn_request => 'Recv ARP request on Link1 (TN IPv4addr)', arp_tn2nut_reply => 'Send ARP reply on Link1 (TN IPv4addr)', ns_nut2tn_siit0 => 'Recv Neighbor Solicitation on Link0 (SIIT V6addr)', na_tn2nut_siit0 => 'Send Neighbor Advertisement on Link0 (SIIT V6addr)', ); $result = $V6evalTool::exitPass; $result += send_recv($IF, 'icmp6_hoplimit_255', $IF1, 'icmp4_ttl_254'); $result += send_recv($IF, 'icmp6_hoplimit_64', $IF1, 'icmp4_ttl_63'); $result += send_recv($IF, 'icmp6_hoplimit_2', $IF1, 'icmp4_ttl_1'); $result += send_recv($IF, 'icmp6_hoplimit_1', $IF, 'icmp6_hoplimit_1_exceed'); if($result == $V6evalTool::exitPass) { vLogHTML("

OK

"); exit $V6evalTool::exitPass; } error: vLogHTML("

NG

"); exit $V6evalTool::exitFail; ######################################################################## __END__ =head1 NAME rfc2765_4.1_hoplimit.seq - Verify IPv6 <-> IPv4 header translation in accordance with RFC2765 [SIIT] =head1 TARGET Router =head1 SYNOPSIS rfc2765_4.1_hoplimit.seq [-tooloption ...] -p rfc2765_3.1_hoplimit.def =head1 INITIALIZATION =begin html 
	Before this test starts, run initialize.seq.
=end html =head1 TEST PROCEDURE This test verifies that NUT properly translates Hop Limit - 1 to TTL, or sends an ICMPv6 Time Exceeded. Network Topology Link0 -------------------------- | | TN NUT | | -------------------------- Link1 TN -- (Link0) -- NUT NUT -- (Link1) -- TN --------------------- ------------------------ =begin html
1.1. ===================> ICMPv6 Echo Request IPv6 Header src address : TN LINK0 IPv4 embedded IPv6 address dst address : TN LINK1 IPv4 embedded IPv6 address Hop Limit = 255 ICMPv6 echo request 1.2. <> ===================> ICMPv4 Echo request IPv4 Header src address : TN LINK0 IPv4 address dst address : TN LINK1 IPv4 address Don't Fragment = 1 TTL = 254 ICMPv4 echo request =begin html
2.1. ===================> ICMPv6 Echo Request IPv6 Header src address : TN LINK0 IPv4 embedded IPv6 address dst address : TN LINK1 IPv4 embedded IPv6 address Hop Limit = 64 ICMPv6 echo request 2.2. <> ===================> ICMPv4 Echo request IPv4 Header src address : TN LINK0 IPv4 address dst address : TN LINK1 IPv4 address Don't Fragment = 1 TTL = 63 ICMPv4 echo request =begin html
3.1. ===================> ICMPv6 Echo Request IPv6 Header src address : TN LINK0 IPv4 embedded IPv6 address dst address : TN LINK1 IPv4 embedded IPv6 address Hop Limit = 2 ICMPv6 echo request 3.2. <> ===================> ICMPv4 Echo request IPv4 Header src address : TN LINK0 IPv4 address dst address : TN LINK1 IPv4 address Don't Fragment = 1 TTL = 1 ICMPv4 echo request =begin html
4.1. ===================> ICMPv6 Echo Request IPv6 Header src address : TN LINK0 IPv4 embedded IPv6 address dst address : TN LINK1 IPv4 embedded IPv6 address Hop Limit = 1 ICMPv6 echo request 4.2. <> <=================== ICMPv6 Time Exceeded IPv6 Header src address : TN LINK0 IPv4 embedded IPv6 address dst address : TN LINK1 IPv4 embedded IPv6 address ICMPv6 Time Exceeded Type = 3 Code = 0 (hop limit exceeded in transit) data = ICMPv6 Echo Request =head1 JUDGMENT << PASS >> NUT translates ICMPv6 with Hop Limit = 255, 64, 2 to ICMPv4 with TTL = 254, 63, 1. NUT responds to ICMPv6 Echo Request with TTL = 1 with an ICMPv6 Time Exceeded message. << FAIL >> NUT doesn't translate Hop Limit properly, or doesn't respond with ICMPv6 Time Exceeded messages when Hop Limit = 1 on incoming packages. =head1 NOTE =head1 REFERENCE B 4.1. Translating IPv6 Headers into IPv4 Headers If there is no IPv6 Fragment header the IPv4 header fields are set as follows: Time to Live: Hop Limit value copied from IPv6 header. Since the translator is a router, as part of forwarding the packet it needs to decrement either the IPv6 Hop Limit (before the translation) or the IPv4 TTL (after the translation). As part of decrementing the TTL or Hop Limit the translator (as any router) needs to check for zero and send the ICMPv4 or ICMPv6 "ttl exceeded" error. =head1 SEE ALSO perldoc V6evalTool =cut