#!/usr/bin/perl
#
# SCTP Conformance Test Suite Implementation
# (C) Copyright Fujitsu Ltd. 2008, 2009
#
# This file is part of the SCTP Conformance Test Suite implementation.
#
# The SCTP Conformance Test Suite implementation is free software;
# you can redistribute it and/or modify it under the terms of
# the GNU General Public License version 2 as published by
# the Free Software Foundation.
#
# The SCTP Conformance Test Suite implementation is distributed in the
# hope that it will be useful, but WITHOUT ANY WARRANTY; without even
# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
# PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU CC; see the file COPYING.  If not, write to
# the Free Software Foundation, 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
#
# Please send any bug reports or fixes you make to the
# email address(es):
#    networktest sctp <networktest-sctp@lists.sourceforge.net>
#
# Or submit a bug report through the following website:
#    http://networktest.sourceforge.net/
#
# Written or modified by:
#    Hiroaki Kago <linuxsctp-kg@ml.css.fujitsu.com>
#    Wei Yongjun <yjwei@cn.fujitsu.com>
#
# Any bugs reported given to us we will try to fix... any fixes shared will
# be incorporated into the next SCTP release.
#
##############################################################################
BEGIN {	$V6evalTool::TestVersion = '$Name: REL_1_0_0 $'; }

use lib "../common";
use V6evalTool;
use SCTP;

%pktdesc = (
	sctp_chunk_ecn_echo_bad_len	=> "Send SCTP CHUNK_ECN_ECHO (with bad chunk length)",
	sctp_chunk_abort		=> "Recv SCTP CHUNK_ABORT",
);

$IF0 = Link0;

vCapture($IF0);

sctpCheckEnv($IF0);

sctpStartServer($IF0);

vConnect($IF0);

vLogHTML('<B>================ Main Test =================</B>');

vSend($IF0, sctp_chunk_ecn_echo_bad_len);

%ret = vWarpRecv($IF0, 30, 0, 0, sctp_chunk_abort);
if($ret{status} != 0 || $ret{recvFrame} ne sctp_chunk_abort) {
	vSend($IF0, sctp_chunk_abort_snd);
	vLogHTML('Cannot receive SCTP CHUNK_ABORT<BR>');
	vLogHTML('<FONT COLOR="#00FF00">NG</FONT>'); 
	exit $V6evalTool::exitFail;
}

vLogHTML(OK);
exit $V6evalTool::exitPass;

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

=head1 NAME

  EchoWithBadChunkLength.seq - ECN-ECHO chunk is received with invalid chunk length

=head1 PURPOSE

  To check that if ECN-ECHO chunk is received with invalid chunk length, the
  endpoint should response with ABORT message.

=head1 SYNOPSIS

=begin html
<PRE>
  <A HREF="./EchoWithBadChunkLength.seq">./EchoWithBadChunkLength.seq</A> [-tooloption ...] -pkt <A HREF="./EchoWithBadChunkLength.def">./EchoWithBadChunkLength.def</A>
    -tooloption : v6eval tool option
  See Also: <A HREF="../common/STD_PKT_COMMON.def">../common/STD_PKT_COMMON.def</A>
            <A HREF="../common/SCTP_COMMON.def">../common/SCTP_COMMON.def</A>
</PRE>

=end html

=head1 PRE-TEST CONDITION

  Association is established between endpoint A and B. Arrange data 
  in endpoint A such that ECN-ECHO chunk with invalid chunk length is 
  sent to endpoint A.

=head1 TEST PROCEDURE

  Endpoint A                           Endpoint B                ULP
  (ESTABLISHED)                        (ESTABLISHED)

  ECN_CWR       ----------------->
  (with invalid chunk length)
                <----------------      ABORT

  TEST DESCRIPTION:

  1. Send ECN_ECHO chunk with invalid chunk length from endpoint A to 
     endpoint B.
  2. Check A: ABORT message will be sent to response ECN_ECHO chunk from
     endpoint B.

=head1 NOTE

  None

=head1 REFERENCE

  RFC 4960

  Appendix A.  Explicit Congestion Notification

    CWR:

    [RFC3168] details a specific bit for a sender to send in the header
    of its next outbound TCP segment to indicate to its peer that it has
    reduced its congestion window.  This is termed the CWR bit.  For
    SCTP, the same indication is made by including the CWR chunk.  This
    chunk contains one data element, i.e., the TSN number that was sent
    in the ECNE chunk.  This element represents the lowest TSN number in
    the datagram that was originally marked with the CE bit.

         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
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        | Chunk Type=13 | Flags=00000000|    Chunk Length = 8           |
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        |                      Lowest TSN Number                        |
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

        Note: The CWR is considered a Control chunk.