1 /* Copyright (c) 2007-2020. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
7 #include <unordered_set>
9 #include "xbt/config.hpp"
10 #include "xbt/string.hpp"
11 #include "xbt/utility.hpp"
13 #include <ns3/core-module.h>
14 #include <ns3/csma-helper.h>
15 #include <ns3/global-route-manager.h>
16 #include <ns3/internet-stack-helper.h>
17 #include <ns3/ipv4-address-helper.h>
18 #include <ns3/packet-sink-helper.h>
19 #include <ns3/point-to-point-helper.h>
20 #include <ns3/application-container.h>
21 #include <ns3/event-id.h>
23 #include "ns3/mobility-module.h"
24 #include "ns3/wifi-module.h"
26 #include "network_ns3.hpp"
27 #include "ns3/ns3_simulator.hpp"
29 #include "simgrid/kernel/routing/NetPoint.hpp"
30 #include "simgrid/plugins/energy.h"
31 #include "simgrid/s4u/Engine.hpp"
32 #include "simgrid/s4u/NetZone.hpp"
33 #include "src/instr/instr_private.hpp" // TRACE_is_enabled(). FIXME: remove by subscribing tracing to the surf signals
34 #include "src/surf/surf_interface.hpp"
35 #include "src/surf/xml/platf_private.hpp"
36 #include "surf/surf.hpp"
38 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(ns3, surf, "Logging specific to the SURF network ns-3 module");
44 extern std::map<std::string, SgFlow*> flow_from_sock;
45 extern std::map<std::string, ns3::ApplicationContainer> sink_from_sock;
47 static ns3::InternetStackHelper stack;
49 static int number_of_links = 1;
50 static int number_of_networks = 1;
53 static ns3::WifiHelper wifi;
54 static ns3::YansWifiPhyHelper wifiPhy = ns3::YansWifiPhyHelper::Default();
55 static ns3::YansWifiChannelHelper wifiChannel = ns3::YansWifiChannelHelper::Default();
56 static ns3::WifiMacHelper wifiMac;
57 static ns3::MobilityHelper mobility;
59 simgrid::xbt::Extension<simgrid::kernel::routing::NetPoint, NetPointNs3> NetPointNs3::EXTENSION_ID;
61 static std::string transformIpv4Address(ns3::Ipv4Address from)
63 std::stringstream sstream;
68 NetPointNs3::NetPointNs3() : ns3_node_(ns3::CreateObject<ns3::Node>(0))
70 stack.Install(ns3_node_);
73 WifiZone::WifiZone(const std::string& name_, simgrid::s4u::Host* host_, ns3::Ptr<ns3::Node> ap_node_,
74 ns3::Ptr<ns3::YansWifiChannel> channel_, int mcs_, int nss_, int network_, int link_)
85 wifi_zones[name_] = this;
88 bool WifiZone::is_ap(ns3::Ptr<ns3::Node> node)
90 for (std::pair<std::string, WifiZone*> zone : wifi_zones)
91 if (zone.second->get_ap_node() == node)
96 WifiZone* WifiZone::by_name(const std::string& name)
100 zone = wifi_zones.at(name);
101 } catch (const std::out_of_range& oor) {
107 std::unordered_map<std::string, WifiZone*> WifiZone::wifi_zones;
109 static void initialize_ns3_wifi()
111 wifi.SetStandard(ns3::WIFI_PHY_STANDARD_80211n_5GHZ);
113 for (auto host : simgrid::s4u::Engine::get_instance()->get_all_hosts()) {
114 const char* wifi_link = host->get_property("wifi_link");
115 const char* wifi_mcs = host->get_property("wifi_mcs");
116 const char* wifi_nss = host->get_property("wifi_nss");
119 new WifiZone(wifi_link, host, host->get_netpoint()->extension<NetPointNs3>()->ns3_node_, wifiChannel.Create(),
120 wifi_mcs ? atoi(wifi_mcs) : 3, wifi_nss ? atoi(wifi_nss) : 1, 0, 0);
128 static void clusterCreation_cb(simgrid::kernel::routing::ClusterCreationArgs const& cluster)
130 ns3::NodeContainer Nodes;
132 for (int const& i : *cluster.radicals) {
133 // Create private link
134 std::string host_id = cluster.prefix + std::to_string(i) + cluster.suffix;
135 auto* src = simgrid::s4u::Host::by_name(host_id)->get_netpoint();
136 auto* dst = simgrid::s4u::Engine::get_instance()->netpoint_by_name_or_null(cluster.router_id);
137 xbt_assert(dst != nullptr, "No router named %s", cluster.router_id.c_str());
139 ns3_add_direct_route(src, dst, cluster.bw, cluster.lat, cluster.id,
140 cluster.sharing_policy); // Any ns-3 route is symmetrical
142 // Also add the host to the list of hosts that will be connected to the backbone
143 Nodes.Add(src->extension<NetPointNs3>()->ns3_node_);
146 // Create link backbone
148 xbt_assert(Nodes.GetN() <= 65000, "Cluster with ns-3 is limited to 65000 nodes");
149 ns3::CsmaHelper csma;
150 csma.SetChannelAttribute("DataRate",
151 ns3::DataRateValue(ns3::DataRate(cluster.bb_bw * 8))); // ns-3 takes bps, but we provide Bps
152 csma.SetChannelAttribute("Delay", ns3::TimeValue(ns3::Seconds(cluster.bb_lat)));
153 ns3::NetDeviceContainer devices = csma.Install(Nodes);
154 XBT_DEBUG("Create CSMA");
156 std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links);
157 XBT_DEBUG("Assign IP Addresses %s to CSMA.", addr.c_str());
158 ns3::Ipv4AddressHelper ipv4;
159 ipv4.SetBase(addr.c_str(), "255.255.0.0");
160 ipv4.Assign(devices);
162 if (number_of_links == 255) {
163 xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
165 number_of_networks++;
171 static void routeCreation_cb(bool symmetrical, simgrid::kernel::routing::NetPoint* src,
172 simgrid::kernel::routing::NetPoint* dst, simgrid::kernel::routing::NetPoint* /*gw_src*/,
173 simgrid::kernel::routing::NetPoint* /*gw_dst*/,
174 std::vector<simgrid::kernel::resource::LinkImpl*> const& link_list)
176 if (link_list.size() == 1) {
177 auto* link = static_cast<simgrid::kernel::resource::LinkNS3*>(link_list[0]);
179 XBT_DEBUG("Route from '%s' to '%s' with link '%s' %s %s", src->get_cname(), dst->get_cname(), link->get_cname(),
180 (link->get_sharing_policy() == simgrid::s4u::Link::SharingPolicy::WIFI ? "(wifi)" : "(wired)"),
181 (symmetrical ? "(symmetrical)" : "(not symmetrical)"));
183 // XBT_DEBUG("src (%s), dst (%s), src_id = %d, dst_id = %d",src,dst, src_id, dst_id);
184 XBT_DEBUG("\tLink (%s) bw:%fbps lat:%fs", link->get_cname(), link->get_bandwidth(), link->get_latency());
186 ns3_add_direct_route(src, dst, link->get_bandwidth(), link->get_latency(), link->get_name(),
187 link->get_sharing_policy());
189 static bool warned_about_long_routes = false;
191 if (not warned_about_long_routes)
192 XBT_WARN("Ignoring a route between %s and %s of length %zu: Only routes of length 1 are considered with ns-3.\n"
193 "WARNING: You can ignore this warning if your hosts can still communicate when only considering routes "
195 "WARNING: Remove long routes to avoid this harmless message; subsequent long routes will be silently "
197 src->get_cname(), dst->get_cname(), link_list.size());
198 warned_about_long_routes = true;
205 void surf_network_model_init_NS3()
207 xbt_assert(surf_network_model == nullptr, "Cannot set the network model twice");
209 surf_network_model = new simgrid::kernel::resource::NetworkNS3Model();
212 static simgrid::config::Flag<std::string>
213 ns3_tcp_model("ns3/TcpModel", "The ns-3 tcp model can be : NewReno or Reno or Tahoe", "default");
219 NetworkNS3Model::NetworkNS3Model() : NetworkModel(Model::UpdateAlgo::FULL)
221 xbt_assert(not sg_link_energy_is_inited(),
222 "LinkEnergy plugin and ns-3 network models are not compatible. Are you looking for Ecofen, maybe?");
224 all_existing_models.push_back(this);
226 NetPointNs3::EXTENSION_ID = routing::NetPoint::extension_create<NetPointNs3>();
228 ns3::Config::SetDefault("ns3::TcpSocket::SegmentSize", ns3::UintegerValue(1000));
229 ns3::Config::SetDefault("ns3::TcpSocket::DelAckCount", ns3::UintegerValue(1));
230 ns3::Config::SetDefault("ns3::TcpSocketBase::Timestamp", ns3::BooleanValue(false));
232 auto TcpProtocol = ns3_tcp_model.get();
233 if (TcpProtocol == "default") {
236 } else if (TcpProtocol == "Reno" || TcpProtocol == "NewReno" || TcpProtocol == "Tahoe") {
237 XBT_INFO("Switching Tcp protocol to '%s'", TcpProtocol.c_str());
238 ns3::Config::SetDefault("ns3::TcpL4Protocol::SocketType", ns3::StringValue("ns3::Tcp" + TcpProtocol));
241 xbt_die("The ns3/TcpModel must be: NewReno or Reno or Tahoe");
244 routing::NetPoint::on_creation.connect([](routing::NetPoint& pt) {
245 pt.extension_set<NetPointNs3>(new NetPointNs3());
246 XBT_VERB("Declare SimGrid's %s within ns-3", pt.get_cname());
249 s4u::Engine::on_platform_created.connect([]() {
250 /* Create the ns3 topology based on routing strategy */
251 ns3::GlobalRouteManager::BuildGlobalRoutingDatabase();
252 ns3::GlobalRouteManager::InitializeRoutes();
254 routing::on_cluster_creation.connect(&clusterCreation_cb);
255 s4u::NetZone::on_route_creation.connect(&routeCreation_cb);
258 LinkImpl* NetworkNS3Model::create_link(const std::string& name, const std::vector<double>& bandwidths, double latency,
259 s4u::Link::SharingPolicy policy)
261 xbt_assert(bandwidths.size() == 1, "ns-3 links must use only 1 bandwidth.");
262 return new LinkNS3(this, name, bandwidths[0], latency, policy);
265 Action* NetworkNS3Model::communicate(s4u::Host* src, s4u::Host* dst, double size, double rate)
267 xbt_assert(rate == -1,
268 "Communication over ns-3 links cannot specify a specific rate. Please use -1 as a value instead of %f.",
270 return new NetworkNS3Action(this, size, src, dst);
273 double NetworkNS3Model::next_occurring_event(double now)
275 double time_to_next_flow_completion = 0.0;
276 XBT_DEBUG("ns3_next_occurring_event");
278 //get the first relevant value from the running_actions list
280 // If there is no comms in NS-3, then we do not move it forward.
281 // We will synchronize NS-3 with SimGrid when starting a new communication.
282 // (see NetworkNS3Action::NetworkNS3Action() for more details on this point)
283 if (get_started_action_set()->empty() || now == 0.0)
286 XBT_DEBUG("doing a ns3 simulation for a duration of %f", now);
288 time_to_next_flow_completion = ns3::Simulator::Now().GetSeconds() - surf_get_clock();
289 // NS-3 stops as soon as a flow ends,
290 // but it does not process the other flows that may finish at the same (simulated) time.
291 // If another flow ends at the same time, time_to_next_flow_completion = 0
292 if(double_equals(time_to_next_flow_completion, 0, sg_surf_precision))
293 time_to_next_flow_completion = 0.0;
295 XBT_DEBUG("min : %f", now);
296 XBT_DEBUG("ns3 time : %f", ns3::Simulator::Now().GetSeconds());
297 XBT_DEBUG("surf time : %f", surf_get_clock());
298 XBT_DEBUG("Next completion %f :", time_to_next_flow_completion);
300 return time_to_next_flow_completion;
303 void NetworkNS3Model::update_actions_state(double now, double delta)
305 static std::vector<std::string> socket_to_destroy;
307 std::string ns3_socket;
308 for (const auto& elm : flow_from_sock) {
309 ns3_socket = elm.first;
310 SgFlow* sgFlow = elm.second;
311 NetworkNS3Action * action = sgFlow->action_;
312 XBT_DEBUG("Processing socket %p (action %p)",sgFlow,action);
313 // Because NS3 stops as soon as a flow is finished, the other flows that ends at the same time may remains in an
314 // inconsistent state (i.e. remains_ == 0 but finished_ == false).
315 // However, SimGrid considers sometimes that an action with remains_ == 0 is finished.
316 // Thus, to avoid inconsistencies between SimGrid and NS3, set remains to 0 only when the flow is finished in NS3
317 int remains = action->get_cost() - sgFlow->sent_bytes_;
319 action->set_remains(remains);
321 if (TRACE_is_enabled() && action->get_state() == kernel::resource::Action::State::STARTED) {
322 double data_delta_sent = sgFlow->sent_bytes_ - action->last_sent_;
324 std::vector<LinkImpl*> route = std::vector<LinkImpl*>();
326 action->get_src().route_to(&action->get_dst(), route, nullptr);
327 for (auto const& link : route)
328 instr::resource_set_utilization("LINK", "bandwidth_used", link->get_cname(), action->get_category(),
329 (data_delta_sent) / delta, now - delta, delta);
331 action->last_sent_ = sgFlow->sent_bytes_;
334 if(sgFlow->finished_){
335 socket_to_destroy.push_back(ns3_socket);
336 XBT_DEBUG("Destroy socket %p of action %p", ns3_socket.c_str(), action);
337 action->set_remains(0);
338 action->finish(Action::State::FINISHED);
340 XBT_DEBUG("Socket %p sent %u bytes out of %u (%u remaining)", ns3_socket.c_str(), sgFlow->sent_bytes_,
341 sgFlow->total_bytes_, sgFlow->remaining_);
345 while (not socket_to_destroy.empty()) {
346 ns3_socket = socket_to_destroy.back();
347 socket_to_destroy.pop_back();
348 SgFlow* flow = flow_from_sock.at(ns3_socket);
349 if (XBT_LOG_ISENABLED(ns3, xbt_log_priority_debug)) {
350 XBT_DEBUG("Removing socket %p of action %p", ns3_socket.c_str(), flow->action_);
353 flow_from_sock.erase(ns3_socket);
354 sink_from_sock.erase(ns3_socket);
362 LinkNS3::LinkNS3(NetworkNS3Model* model, const std::string& name, double bandwidth, double latency,
363 s4u::Link::SharingPolicy policy)
364 : LinkImpl(model, name, nullptr), sharing_policy_(policy)
366 bandwidth_.peak = bandwidth;
367 latency_.peak = latency;
369 /* If wifi, create the wifizone now. If not, don't do anything: the links will be created in routeCreate_cb */
371 if (policy == simgrid::s4u::Link::SharingPolicy::WIFI) {
372 static bool wifi_init = false;
374 initialize_ns3_wifi();
378 ns3::NetDeviceContainer netA;
379 WifiZone* zone = WifiZone::by_name(name);
380 xbt_assert(zone != nullptr, "Link name '%s' does not match the 'wifi_link' property of a host.", name.c_str());
381 auto* netpoint_ns3 = zone->get_host()->get_netpoint()->extension<NetPointNs3>();
383 wifi.SetRemoteStationManager("ns3::ConstantRateWifiManager", "ControlMode", ns3::StringValue("HtMcs0"), "DataMode",
384 ns3::StringValue("HtMcs" + std::to_string(zone->get_mcs())));
386 wifiPhy.SetChannel(zone->get_channel());
387 wifiPhy.Set("Antennas", ns3::UintegerValue(zone->get_nss()));
388 wifiPhy.Set("MaxSupportedTxSpatialStreams", ns3::UintegerValue(zone->get_nss()));
389 wifiPhy.Set("MaxSupportedRxSpatialStreams", ns3::UintegerValue(zone->get_nss()));
391 wifiMac.SetType("ns3::ApWifiMac",
392 "Ssid", ns3::SsidValue(name));
394 netA.Add(wifi.Install(wifiPhy, wifiMac, zone->get_ap_node()));
396 ns3::Ptr<ns3::ListPositionAllocator> positionAllocS = ns3::CreateObject<ns3::ListPositionAllocator>();
397 positionAllocS->Add(ns3::Vector(0, 0, 0));
398 mobility.SetPositionAllocator(positionAllocS);
399 mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
400 mobility.Install(zone->get_ap_node());
402 ns3::Ipv4AddressHelper address;
403 std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links);
404 address.SetBase(addr.c_str(), "255.255.0.0");
405 XBT_DEBUG("\tInterface stack '%s'", addr.c_str());
406 auto addresses = address.Assign(netA);
407 zone->set_network(number_of_networks);
408 zone->set_link(number_of_links);
410 netpoint_ns3->ipv4_address_ = transformIpv4Address(addresses.GetAddress(1));
412 if (number_of_links == 255) {
413 xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
415 number_of_networks++;
420 s4u::Link::on_creation(*this->get_iface());
423 LinkNS3::~LinkNS3() = default;
425 void LinkNS3::apply_event(profile::Event*, double)
429 void LinkNS3::set_bandwidth_profile(profile::Profile*)
431 xbt_die("The ns-3 network model doesn't support bandwidth profiles");
433 void LinkNS3::set_latency_profile(profile::Profile*)
435 xbt_die("The ns-3 network model doesn't support latency profiles");
442 NetworkNS3Action::NetworkNS3Action(Model* model, double totalBytes, s4u::Host* src, s4u::Host* dst)
443 : NetworkAction(model, *src, *dst, totalBytes, false)
445 // If there is no other started actions, we need to move NS-3 forward to be sync with SimGrid
446 if (model->get_started_action_set()->size()==1){
447 while(double_positive(surf_get_clock() - ns3::Simulator::Now().GetSeconds(), sg_surf_precision)){
448 XBT_DEBUG("Synchronizing NS-3 (time %f) with SimGrid (time %f)", ns3::Simulator::Now().GetSeconds(), surf_get_clock());
449 ns3_simulator(surf_get_clock() - ns3::Simulator::Now().GetSeconds());
453 XBT_DEBUG("Communicate from %s to %s", src->get_cname(), dst->get_cname());
455 static int port_number = 1025; // Port number is limited from 1025 to 65 000
457 ns3::Ptr<ns3::Node> src_node = src->get_netpoint()->extension<NetPointNs3>()->ns3_node_;
458 ns3::Ptr<ns3::Node> dst_node = dst->get_netpoint()->extension<NetPointNs3>()->ns3_node_;
460 std::string& addr = dst->get_netpoint()->extension<NetPointNs3>()->ipv4_address_;
461 xbt_assert(not addr.empty(), "Element %s is unknown to ns-3. Is it connected to any one-hop link?",
462 dst->get_netpoint()->get_cname());
464 XBT_DEBUG("ns3: Create flow of %.0f Bytes from %s to %s with Interface %s", totalBytes, src->get_cname(),
465 dst->get_cname(), addr.c_str());
466 ns3::PacketSinkHelper sink("ns3::TcpSocketFactory", ns3::InetSocketAddress(ns3::Ipv4Address::GetAny(), port_number));
467 ns3::ApplicationContainer apps = sink.Install(dst_node);
469 ns3::Ptr<ns3::Socket> sock = ns3::Socket::CreateSocket(src_node, ns3::TcpSocketFactory::GetTypeId());
471 flow_from_sock.insert({transform_socket_ptr(sock), new SgFlow(totalBytes, this)});
472 sink_from_sock.insert({transform_socket_ptr(sock), apps});
474 sock->Bind(ns3::InetSocketAddress(port_number));
476 ns3::Simulator::ScheduleNow(&start_flow, sock, addr.c_str(), port_number);
479 if(port_number > 65000){
481 XBT_WARN("Too many connections! Port number is saturated. Trying to use the oldest ports.");
484 s4u::Link::on_communicate(*this);
487 void NetworkNS3Action::suspend() {
491 void NetworkNS3Action::resume() {
495 std::list<LinkImpl*> NetworkNS3Action::get_links() const
499 void NetworkNS3Action::update_remains_lazy(double /*now*/)
504 } // namespace resource
505 } // namespace kernel
506 } // namespace simgrid
508 void ns3_simulator(double maxSeconds)
511 if (maxSeconds > 0.0) // If there is a maximum amount of time to run
512 id = ns3::Simulator::Schedule(ns3::Seconds(maxSeconds), &ns3::Simulator::Stop);
514 XBT_DEBUG("Start simulator for at most %fs (current time: %f)", maxSeconds, surf_get_clock());
515 ns3::Simulator::Run ();
516 XBT_DEBUG("Simulator stopped at %fs", ns3::Simulator::Now().GetSeconds());
522 void ns3_add_direct_route(simgrid::kernel::routing::NetPoint* src, simgrid::kernel::routing::NetPoint* dst, double bw,
523 double lat, const std::string& link_name, simgrid::s4u::Link::SharingPolicy policy)
525 ns3::Ipv4AddressHelper address;
526 ns3::NetDeviceContainer netA;
529 auto* host_src = src->extension<NetPointNs3>();
530 auto* host_dst = dst->extension<NetPointNs3>();
532 xbt_assert(host_src != nullptr, "Network element %s does not seem to be ns-3-ready", src->get_cname());
533 xbt_assert(host_dst != nullptr, "Network element %s does not seem to be ns-3-ready", dst->get_cname());
535 if (policy == simgrid::s4u::Link::SharingPolicy::WIFI) {
536 auto a = host_src->ns3_node_;
537 auto b = host_dst->ns3_node_;
538 xbt_assert(WifiZone::is_ap(a) != WifiZone::is_ap(b),
539 "A wifi route can only exist between an access point node and a station node.");
541 ns3::Ptr<ns3::Node> apNode = WifiZone::is_ap(a) ? a : b;
542 ns3::Ptr<ns3::Node> staNode = apNode == a ? b : a;
544 WifiZone* zone = WifiZone::by_name(link_name);
546 wifi.SetRemoteStationManager("ns3::ConstantRateWifiManager", "ControlMode", ns3::StringValue("HtMcs0"), "DataMode",
547 ns3::StringValue("HtMcs" + std::to_string(zone->get_mcs())));
549 wifiPhy.SetChannel(zone->get_channel());
550 wifiPhy.Set("Antennas", ns3::UintegerValue(zone->get_nss()));
551 wifiPhy.Set("MaxSupportedTxSpatialStreams", ns3::UintegerValue(zone->get_nss()));
552 wifiPhy.Set("MaxSupportedRxSpatialStreams", ns3::UintegerValue(zone->get_nss()));
554 wifiMac.SetType ("ns3::StaWifiMac",
555 "Ssid", ns3::SsidValue(link_name),
556 "ActiveProbing", ns3::BooleanValue(false));
558 netA.Add(wifi.Install(wifiPhy, wifiMac, staNode));
560 ns3::Config::Set("/NodeList/*/DeviceList/*/$ns3::WifiNetDevice/Phy/ChannelWidth", ns3::UintegerValue(40));
562 simgrid::kernel::routing::NetPoint* sta_netpoint = WifiZone::is_ap(host_src->ns3_node_) ? dst : src;
563 const char* wifi_distance = simgrid::s4u::Host::by_name(sta_netpoint->get_name())->get_property("wifi_distance");
564 ns3::Ptr<ns3::ListPositionAllocator> positionAllocS = ns3::CreateObject<ns3::ListPositionAllocator>();
565 positionAllocS->Add(ns3::Vector(wifi_distance ? atof(wifi_distance) : 10.0, 0, 0));
566 mobility.SetPositionAllocator(positionAllocS);
567 mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
568 mobility.Install(staNode);
570 std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", zone->get_network(), zone->get_link());
571 address.SetBase(addr.c_str(), "255.255.0.0", ("0.0.0." + std::to_string(zone->get_n_sta_nodes() + 2)).c_str());
572 zone->add_sta_node();
573 XBT_DEBUG("\tInterface stack '%s'", addr.c_str());
574 auto addresses = address.Assign(netA);
575 host_dst->ipv4_address_ = transformIpv4Address(addresses.GetAddress(1));
577 ns3::PointToPointHelper pointToPoint;
579 XBT_DEBUG("\tAdd PTP from %s to %s bw:'%f Bps' lat:'%fs'", src->get_cname(), dst->get_cname(), bw, lat);
580 pointToPoint.SetDeviceAttribute("DataRate",
581 ns3::DataRateValue(ns3::DataRate(bw * 8))); // ns-3 takes bps, but we provide Bps
582 pointToPoint.SetChannelAttribute("Delay", ns3::TimeValue(ns3::Seconds(lat)));
584 netA.Add(pointToPoint.Install(host_src->ns3_node_, host_dst->ns3_node_));
586 std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links);
587 address.SetBase(addr.c_str(), "255.255.0.0");
588 XBT_DEBUG("\tInterface stack '%s'", addr.c_str());
589 auto addresses = address.Assign(netA);
591 host_src->ipv4_address_ = transformIpv4Address(addresses.GetAddress(0));
592 host_dst->ipv4_address_ = transformIpv4Address(addresses.GetAddress(1));
594 if (number_of_links == 255) {
595 xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
597 number_of_networks++;