#!/usr/bin/perl
#
# $Copyright_v6PC$
#
# $Copyright$
#
# $TAHI: ct/nd/routerSendSolRaDefault.seq,v 1.11 2004/04/02 02:28:23 akisada Exp $

########################################################################
BEGIN { $V6evalTool::TestVersion = '$Name:  $ '; }
 
use V6evalTool;
use nd;
use ra;

my $wait_readout = $nd::DELAY_FIRST_PROBE_TIME +
    $nd::RETRANS_TIMER * $nd::MAX_UNICAST_SOLICIT + 1;

ndOptions(@ARGV);

# The following generate debugging messages.
$nd::debug=$ndOpt_v|$ndOpt_vv;

# You can specifies debug options to a remote control program.
# If you want to know more detail, please see the following:
# - V6evalTool.pm: perldoc V6evalTool
# - V6evalRemote.pm: perldoc V6evalRemote
$nd::remote_debug="-o1" if $ndOpt_vv;

$IF=Link0;
$exit_rtn=$V6evalTool::exitPass;

$wait_ra=$ra::defaultRA2maxInterval*2;
$delay=1;

#
#
#
$type=$V6evalTool::NutDef{Type};
if($type eq host) {
    vLogHTML("This test is for the router only<BR>");
    exit $V6evalTool::exitRouterOnly;
}

$type=$V6evalTool::NutDef{Type};
if($type ne router) {
    vLogHTML(ndErrmsg("ERROR: $V6evalTool::NutDef{Type}: ".
		      "Unknown target type<BR>"));
    exit $V6evalTool::exitFail;
}

if(raIsMarkDefaultRA2() == 0) {
    vLogHTML(ndErrmsg("ERROR: Need RA configuration<BR>"));
        readout($IF, $wait_readout);
    exit $V6evalTool::exitFail;
}

#
#
#
vCapture($IF);

#
#
#
if(beforeLimit() == 0) {
    $exit_rtn=$V6evalTool::exitFail;
        readout($IF, $wait_readout);
}
if(afterLimit() == 0) {
    $exit_rtn=$V6evalTool::exitFail;
        readout($IF, $wait_readout);
}

#
#
#
end:
    exit $exit_rtn;

sub readout($$) {
        my ($if, $timeout) = @_;
        return(vRecv($if, $timeout, 0, 0));
}

sub beforeLimit()
{
    #
    #
    #
    vClear($IF);

    #
    #
    #
    if(raRecvAnyRA($IF, $wait_ra, 0, 0, %ret1) == 0) {
	vLogHTML("ERROR: Never got RA<BR>");
	goto error;
    }

    #
    #
    #
    vSleep($nd::MIN_DELAY_BETWEEN_RAS - $delay,
	   "Wait (MIN_DELAY_BETWEEN_RAS - $delay) sec.");
    $pktdesc{rs_tn2allrouter}="Send RS";
    %ret2=vSend($IF, rs_tn2allrouter);

    #
    #
    #
    if(raRecvAnyRA($IF, $wait_ra, $ret2{sentTime1}, 0, %ret3) == 0) {
	vLogHTML("ERROR: Never got RA<BR>");
	goto error;
    }

    #
    #
    #
    $n=$ret1{recvCount};
    $time_first=$ret1{"recvTime$n"};
    $n=$ret3{recvCount};
    $time_last=$ret3{"recvTime$n"};
    $interval=$time_last-$time_first;
    vLogHTML("Interval between RAs (1st and 2nd): $interval<BR>");
    if($interval < $nd::MIN_DELAY_BETWEEN_RAS ||
       $interval > $nd::MIN_DELAY_BETWEEN_RAS+1) {
	vLogHTML(ndErrmsg("ERROR: $nd::MIN_DELAY_BETWEEN_RAS &lt; ".
			  "The interval &lt; ".
			  "$nd::MIN_DELAY_BETWEEN_RAS+1<BR>"));
	goto error;
    }

    #
    #
    #
    return(1);

error:
    return(0);
}

sub afterLimit()
{
    #
    #
    #
    vClear($IF);

    #
    #
    #
    if(raRecvAnyRA($IF, $wait_ra, 0, 0, %ret1) == 0) {
	vLogHTML("ERROR: Never got RA<BR>");
	goto error;
    }

    #
    #
    #
    vSleep($nd::MIN_DELAY_BETWEEN_RAS + $delay,
	   "Wait (MIN_DELAY_BETWEEN_RAS + $delay) sec.");
    $pktdesc{rs_tn2allrouter}="Send RS";
    %ret2=vSend($IF, rs_tn2allrouter);

    #
    #
    #
    if(raRecvAnyRA($IF, $wait_ra, $ret2{sentTime1}, 0, %ret3) == 0) {
	vLogHTML("ERROR: Never got RA<BR>");
	goto error;
    }

    #
    #
    #
    $time_first=$ret2{sentTime1};
    $n=$ret3{recvCount};
    $time_last=$ret3{"recvTime$n"};
    $interval=$time_last-$time_first;
    vLogHTML("Interval between RS and RA: $interval<BR>");
    if($interval > $nd::MAX_RA_DELAY_TIME) {
	vLogHTML(ndErrmsg("ERROR: $nd::MAX_RA_DELAY_TIME &lt; ".
			  "The interval<BR>"));
	goto error;
    }

    #
    #
    #
    return(1);

error:
    return(0);
}

########################################################################
__END__

=head1 NAME

routerSendSolRaDefault - Verify that NUT sends Solicited RA by default value specified in RFC

=head1 TARGET

Router Only

=head1 SYNOPSIS

  routerSendSolRaDefault.seq [-tooloption ...] -p routerSendSolRaDefault.def

=head1 INITIALIZATION

=begin html
Start NUT advertising RAs whose parameters are as same as 
<A HREF="startDefaultRA.html#INITIALIZATION">those</A>
except the followings:
<UL>
  <LI>MaxRtrAdvInterval:7
  <LI>MinRtrAdvInterval:10
</UL>

=end html

=head1 TEST PROCEDURE

B<routerSendSolRaDefault> verifies that RA is delayed by the rules.

=begin html
<PRE>
CASE I
<BR>
  TN               NUT
  ----------------------
<BR>
  <=== RA ====
       src=NUT
       dst=all-node
       any option is accepted.
<BR>
       T1 <= received time
<BR>
  Wait(MIN_DELAY_BETWEEN_RAS - 1 sec)
<BR>
  ==== RS ===>
       src=TN
       dst=all-router
<BR>
  <=== RA ====
       src=NUT
       dst=allnode
       any option is accepted.
<BR>
       T2 <= received time
<BR>
  <A HREF="#JDG1">Judgment</A>: MIN_DELAY_BETWEEN_RAS < T2 - T1 < MIN_DELAY_BETWEEN_RAS +
                                              RA_MAX_DELAY_TIME
<BR>
CASE II
<BR>
  TN               NUT
  ----------------------
<BR>
  <=== RA ====
       src=NUT
       dst=all-node
       any option is accepted.
<BR>
  Wait(MIN_DELAY_BETWEEN_RAS + 1 sec)
<BR>
  ==== RS ===>
       src=TN
       dst=all-router
<BR>
       T1 <= sent time
<BR>
  <=== RA ====
       src=NUT
       dst=all-node
       any option is accepted.
<BR>
       T2 <= received time
<BR>
  <A HREF="#JDG2">Judgment</A>: 0 < = T2 - T1 < RA_MAX_DELAY_TIME
</PRE>

=end html

=head1 JUDGMENT

=begin html
<PRE>
<A NAME="JDG1">CASE I</A>
                                    Solicited
      Multicast                     Multicast
          RA                 RS         RA
          ^                  |          ^
          |                  |          |
          |                  V          |
      ----+------------------+-----+----+----> time
          |<======================>|    |
          | MIN_DELAY_BETWEEN_RAS       |
          |                             |
          |<===========================>|
            <A HREF="#REF1">MIN_DELAY_BETWEEN_RAS + T</A>
<BR>
      MIN_DELAY_BETWEEN_RAS=3 sec.
      0 < T < MAX_RA_DELAY_TIME (0.5 sec)
<BR>
<A NAME="JDG2">CASE II</A>
                                           Solicited
      Multicast                            Multicast
          RA                            RS    RA
          ^                             |     ^
          |                             |     |
          |                             V     |
      ----+------------------------+----+-----+---> time
          |<======================>|    |<===>|
            MIN_DELAY_BETWEEN_RAS          <A HREF="#REF2">T</A>
<BR>
      MIN_DELAY_BETWEEN_RAS=3 sec.
      0 < T < MAX_RA_DELAY_TIME (0.5 sec)
</PRE>

=end html

=head1 TERMINATION

  N/A

=head1 NOTE

  The test does not invoke any remote command.

=head1 REFERENCE

=begin html
<PRE>
6.2.6.  Processing Router Solicitations
<BR>
   A host MUST silently discard any received Router Solicitation
   messages.
<BR>
   In addition to sending periodic, unsolicited advertisements, a router
   sends advertisements in response to valid solicitations received on
   an advertising interface.  A router MAY choose to unicast the
   response directly to the soliciting host's address (if the
   solicitation's source address is not the unspecified address), but
   the usual case is to multicast the response to the all-nodes group.
   In the latter case, the interface's interval timer is reset to a new
   random value, as if an unsolicited advertisement had just been sent
   (see Section 6.2.4).
<BR>
   In all cases, Router Advertisements sent in response to a Router
   Solicitation MUST be delayed by a random time between 0 and
   MAX_RA_DELAY_TIME seconds. (If a single advertisement is sent in
   response to multiple solicitations, the delay is relative to the
   first solicitation.)  In addition, consecutive Router Advertisements
   sent to the all-nodes multicast address MUST be rate limited to no
   more than one advertisement every MIN_DELAY_BETWEEN_RAS seconds.
<BR>
   A router might process Router Solicitations as follows:
<BR>
    - Upon receipt of a Router Solicitation, compute a random delay
      within the range 0 through MAX_RA_DELAY_TIME.  If the computed
      value corresponds to a time later than the time the next multicast
      Router Advertisement is scheduled to be sent, ignore the random
      delay and send the advertisement at the already-scheduled time.
<BR>
    - <A NAME="REF1"><B>If the router sent a multicast Router Advertisement (solicited or
      unsolicited) within the last MIN_DELAY_BETWEEN_RAS seconds,
      schedule the advertisement to be sent at a time corresponding to
      MIN_DELAY_BETWEEN_RAS plus the random value after the previous
      advertisement was sent.  This ensures that the multicast Router
      Advertisements are rate limited.</B></A>
<BR>
    - <A NAME="REF2"><B>Otherwise, schedule the sending of a Router Advertisement at the
      time given by the random value.</B></A>
<BR>
   Note that a router is permitted to send multicast Router
   Advertisements more frequently than indicated by the
   MinRtrAdvInterval configuration variable so long as the more frequent
   advertisements are responses to Router Solicitations.  In all cases,
   however, unsolicited multicast advertisements MUST NOT be sent more
   frequently than indicated by MinRtrAdvInterval.
</PRE>

=end html

=head1 SEE ALSO

  perldoc V6evalTool
  perldoc V6evalRemote

=cut