#!/usr/bin/perl # # $Copyright$ # # $TAHI: ct/icmp/Pkt_Too_Big.seq,v 1.3 2003/10/20 02:42:55 masaxmasa Exp $ ######################################################################## BEGIN { $V6evalTool::TestVersion = '$Name: $'; } use V6evalTool; use icmp; use Pkt_Too_Big; # Interface $IF = "Link0"; $IF1 = "Link1"; checkNUT(router); # # # vLogHTML("Initialization
"); vCapture($IF); vCapture($IF1); #---------------------------------------------------------------------- # create neighbor cache entries for link0 #---------------------------------------------------------------------- $ret = mkNCE_Link(); if ($ret != 0) { vLog("NUT can not be initialized !!"); goto error; } else { vLog("*** TN can make TN's link local address NCE in TN ***"); }; $ret = mkNCE_Global(); if ($ret != 0) { vLog("NUT can not be initialized !!"); goto error; } else { vLog("*** TN can make TN's global address NCE in TN ***"); }; #---------------------------------------------------------------------- # create neighbor cache entries for link1 #---------------------------------------------------------------------- $ret = mkNCE_Link1(); if ($ret != 0) { vLog("NUT can not be initialized !!"); goto error; } else { vLog("*** TN can make TN's link local address NCE in TN ***"); }; #---------------------------------------------------------------------- # set route #---------------------------------------------------------------------- $ret = set_routes(); if ($ret != 0) { vLog("NUT can not be initialized !!"); goto error; }; #---------------------------------------------------------------------- # Configuration Test -- Forwarding -- #---------------------------------------------------------------------- vLog("Check NUT configuration"); if (check_fwd() != 0) { vLog("NUT's configuration was incorrect!!"); goto error; }; %pktdesc = ( ns_local => 'Receive Neighbor Solicitation (Link0)', ns_local_sll => 'Receive Neighbor Solicitation (Link0)', na_local => 'Send Neighbor Advertisement (Link0)', ns_global => 'Receive Neighbor Solicitation (Link0)', ns_global_sll => 'Receive Neighbor Solicitation (Link0)', na_global => 'Send Neighbor Advertisement (Link0)', echo_request_1500_link0 => 'Send Echo Request w/ 1500 bytes (Link0)', pkt_too_big_link0 => 'Receive Packet Too Big Message (MTU = 1300)', pkt_too_big_link1 => 'Receive Packet Too Big Message (MTU = 1300)' ); #---------------------------------------------------------------------- # Test #---------------------------------------------------------------------- vLogHTML("Test
"); #---------------------------------------------------------------------- # reduce Link MTU of LINK1 Interface from 1500 to 1300 #---------------------------------------------------------------------- if (set_mtu($IF1, 1300)) { vLog("set mtu failed."); goto error; }; %ret1 = vSend($IF, echo_request_1500_link0); again: %ret = vRecv($IF, 5, $ret1{sentTime1}, 0, pkt_too_big_link0, pkt_too_big_link1, ns_global, ns_global_sll, ns_local, ns_local_sll); if ($ret{status} != 0) { vLog("TN can not receive Packet Too Big Message."); goto error; } elsif ($ret{recvFrame} eq 'pkt_too_big_link0' || $ret{recvFrame} eq 'pkt_too_big_link1') { vLog("TN received Packet Too Big Message."); } elsif ($ret{recvFrame} eq 'ns_global' || $ret{recvFrame} eq 'ns_global_sll' || $ret{recvFrame} eq 'ns_local' || $ret{recvFrame} eq 'ns_local_sll') { if ($ret{recvFrame} eq 'ns_global' || $ret{recvFrame} eq 'ns_global_sll') { vSend($IF, na_global); } else { vSend($IF, na_local); }; goto again; } else { vLog("TN received unexpected packet"); goto error; }; #---------------------------------------------------------------------- # remove configurations #---------------------------------------------------------------------- vLog("clear configurations"); set_mtu($IF1, 1500); delete_routes(); vLog("OK"); exit($V6evalTool::exitPass); error: vLogHTML("FAIL"); vLogHTML("clear configurations"); delete_routes(); set_mtu($IF1, 1500); exit($V6evalTool::exitFail); ######################################################################## __END__ =head1 NAME Pkt_Too_Big - Verify that the NUT sends Packet Too Big Message =head1 TARGET Router =head1 SYNOPSIS Pkt_Too_Big.seq [-tooloption ...] -p Pkt_Too_Big.def =head1 NETWORK CONFIGURATION This test is OFFLINK Network Configuration test. In this test, TN play a Roll of the Router. Physical Network configuration Link0 --------+---------------+-------------- | | NUT TN | | --------+---------------+-------------- Link1 Logical Network Configuration Host A (TN-Link0) | Link0 --------+-------+----------------- | NUT (globaladdress:B) | --------+-------+----------------- | Link1 Router(TN-Link1) | ----------------+-------+--------- | HOST B (OFFLINK_LINK1_GLOBAL_ADDRESS) In this configuration, Packets are send and received. for example, In Logical HOST B -- Echo Reply --> NUT Actually, in physical TN (as Router) -- Echo Reply --> NUT =head1 INITIALIZATION TN attempt to execute remote command 'vRemote(route.rmt)'. 'route add -inet6 OFFLINK_LINK1_GLOBAL_ADDRESS TN-LINK1-address' And status of Neighbor Cache Entry for TN's addresses are reachable. =head1 TEST PROCEDURE This test verifies that the node sends a Packet Too Big Message in response to a packet that it can not forward because the packet is larger than the MTU of the outgoing link. TN NUT --------------------------- 1. After NUT is initialized (set static route) , NUT sets the Link MTU of LINK1 Interface to 1300 . 2. TN send Echo Request to Host B. === echo request ===> 3. NUT send Packet Too Big Message <=== Packet Too Big Message === =head1 JUDGMENT << PASS >> NUT send a Packet Too Big Message. << FAIL >> NUT do not send a Packet Too Big Message. =head1 REFERENCE RFC2463 3.2 Packet Too Big Message 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Code | Checksum | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | MTU | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | As much of invoking packet | + as will fit without the ICMPv6 packet + | exceeding the minimum IPv6 MTU [IPv6] | IPv6 Fields: =begin html 
   Destination Address

                  Copied from the Source Address field of the invoking
                  packet.
=end html ICMPv6 Fields: =begin html 
   Type           2
=end html =begin html 
   Code           Set to 0 (zero) by the sender and ignored by the
                  receiver
=end html MTU The Maximum Transmission Unit of the next-hop link. Description =begin html 
   A Packet Too Big MUST be sent by a router in response to a packet
   that it cannot forward because the packet is larger than the MTU of
   the outgoing link.  The information in this message is used as part
   of the Path MTU Discovery process [PMTU].
=end html Sending a Packet Too Big Message makes an exception to one of the rules of when to send an ICMPv6 error message, in that unlike other messages, it is sent in response to a packet received with an IPv6 multicast destination address, or a link-layer multicast or link- layer broadcast address. =head1 SEE ALSO perldoc V6evalTool perldoc V6evalRemote =cut