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#
# Copyright (c) 2001 University of Southern California.
# All rights reserved.
#
# Redistribution and use in source and binary forms are permitted
# provided that the above copyright notice and this paragraph are
# duplicated in all such forms and that any documentation, advertising
# materials, and other materials related to such distribution and use
# acknowledge that the software was developed by the University of
# Southern California, Information Sciences Institute. The name of the
# University may not be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#
##
# Quick Start for TCP and IP.
# A scheme for transport protocols to dynamically determine initial
# congestion window size.
#
# http://www.ietf.org/internet-drafts/draft-amit-quick-start-02.ps
#
# ns-qsnode.tcl
#
# OTcl support procedures required for Quick Start agent
#
# Srikanth Sundarrajan, 2002
# sundarra@usc.edu
#
RtModule/QS instproc register { node } {
$self next $node
$self instvar classifier_
# Copy the old classifier and save it.
$self set classifier_ [$node entry]
# Create a new classifer for qs processing and attach qs agent
$node set qs_classifier_ [new Classifier/QS]
$node set qs_agent_ [new Agent/QSAgent]
$node set switch_ [$node set qs_classifier_]
# Install existing classifier at slot 1, new classifier at slot 0
$node insert-entry $self [$node set switch_] 1
[$node set switch_] install 0 [$node set qs_agent_]
$node attach [$node set qs_agent_]
[$node set qs_agent_] set old_classifier_ $classifier_
}
Simulator instproc QS { val } {
if { $val == "ON" } {
add-packet-header "TCP_QS"
Node enable-module "QS"
} else {
Node disable-module "QS"
remove-packet-header "TCP_QS"
}
}
Node instproc qs-agent {} {
$self instvar qs_agent_
return $qs_agent_
}
Simulator instproc get-queue { addr daddr } {
$self instvar routingTable_
set srcid [$self get-node-id-by-addr $addr]
set dstid [$self get-node-id-by-addr $daddr]
set nexthop [$routingTable_ lookup $srcid $dstid]
set node1 [$self get-node-by-addr $addr]
set node2 [$self get-node-by-addr $nexthop]
set queue_ [[$self link $node1 $node2] queue]
return $queue_
}
Simulator instproc get-link { addr daddr } {
$self instvar routingTable_
set srcid [$self get-node-id-by-addr $addr]
set dstid [$self get-node-id-by-addr $daddr]
set nexthop [$routingTable_ lookup $srcid $dstid]
set node1 [$self get-node-by-addr $addr]
set node2 [$self get-node-by-addr $nexthop]
set link_ [[$self link $node1 $node2] link]
return $link_
}
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