1 /* Copyright (c) 2007-2021. 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"
11 #include "xbt/string.hpp"
12 #include "xbt/utility.hpp"
14 #include <ns3/application-container.h>
15 #include <ns3/core-module.h>
16 #include <ns3/csma-helper.h>
17 #include <ns3/event-id.h>
18 #include <ns3/global-route-manager.h>
19 #include <ns3/internet-stack-helper.h>
20 #include <ns3/ipv4-address-helper.h>
21 #include <ns3/packet-sink-helper.h>
22 #include <ns3/point-to-point-helper.h>
24 #include "ns3/mobility-module.h"
25 #include "ns3/wifi-module.h"
27 #include "network_ns3.hpp"
28 #include "ns3/ns3_simulator.hpp"
30 #include "simgrid/kernel/routing/NetPoint.hpp"
31 #include "simgrid/kernel/routing/NetZoneImpl.hpp"
32 #include "simgrid/kernel/routing/WifiZone.hpp"
33 #include "simgrid/plugins/energy.h"
34 #include "simgrid/s4u/Engine.hpp"
35 #include "simgrid/s4u/NetZone.hpp"
36 #include "src/instr/instr_private.hpp" // TRACE_is_enabled(). FIXME: remove by subscribing tracing to the surf signals
37 #include "src/kernel/EngineImpl.hpp"
38 #include "src/surf/surf_interface.hpp"
39 #include "src/surf/xml/platf_private.hpp" // ClusterCreationArgs
41 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(res_ns3, res_network, "Network model based on ns-3");
47 extern std::map<std::string, SgFlow*, std::less<>> flow_from_sock;
48 extern std::map<std::string, ns3::ApplicationContainer, std::less<>> sink_from_sock;
50 static ns3::InternetStackHelper stack;
52 static int number_of_links = 1;
53 static int number_of_networks = 1;
56 static ns3::WifiHelper wifi;
57 #if NS3_MINOR_VERSION < 33
58 static ns3::YansWifiPhyHelper wifiPhy = ns3::YansWifiPhyHelper::Default();
60 static ns3::YansWifiPhyHelper wifiPhy;
62 static ns3::YansWifiChannelHelper wifiChannel = ns3::YansWifiChannelHelper::Default();
63 static ns3::WifiMacHelper wifiMac;
64 static ns3::MobilityHelper mobility;
66 simgrid::xbt::Extension<simgrid::kernel::routing::NetPoint, NetPointNs3> NetPointNs3::EXTENSION_ID;
68 static std::string transformIpv4Address(ns3::Ipv4Address from)
70 std::stringstream sstream;
75 NetPointNs3::NetPointNs3() : ns3_node_(ns3::CreateObject<ns3::Node>(0))
77 stack.Install(ns3_node_);
80 static void resumeWifiDevice(ns3::Ptr<ns3::WifiNetDevice> device)
82 device->GetPhy()->ResumeFromOff();
89 static void zoneCreation_cb(simgrid::s4u::NetZone const& zone)
91 simgrid::kernel::routing::WifiZone* wifizone = dynamic_cast<simgrid::kernel::routing::WifiZone*>(zone.get_impl());
92 if (wifizone == nullptr)
95 #if NS3_MINOR_VERSION < 32
96 wifi.SetStandard(ns3::WIFI_PHY_STANDARD_80211n_5GHZ);
98 wifi.SetStandard(ns3::WIFI_STANDARD_80211n_5GHZ);
101 std::string ssid = wifizone->get_name();
102 const char* mcs = wifizone->get_property("mcs");
103 const char* nss = wifizone->get_property("nss");
104 int mcs_value = mcs ? atoi(mcs) : 3;
105 int nss_value = nss ? atoi(nss) : 1;
106 #if NS3_MINOR_VERSION < 30
107 xbt_assert(nss_value == 1 + (mcs_value / 8),
108 "On NS3 < 3.30, NSS value has to satisfy NSS == 1+(MCS/8) constraint. Bailing out");
110 wifi.SetRemoteStationManager("ns3::ConstantRateWifiManager", "ControlMode", ns3::StringValue("HtMcs0"), "DataMode",
111 ns3::StringValue("HtMcs" + std::to_string(mcs_value)));
112 wifiPhy.SetChannel(wifiChannel.Create());
113 wifiPhy.Set("Antennas", ns3::UintegerValue(nss_value));
114 wifiPhy.Set("MaxSupportedTxSpatialStreams", ns3::UintegerValue(nss_value));
115 wifiPhy.Set("MaxSupportedRxSpatialStreams", ns3::UintegerValue(nss_value));
116 #if NS3_MINOR_VERSION > 33
117 wifiPhy.Set("ChannelWidth", ns3::UintegerValue(40));
119 wifiMac.SetType("ns3::ApWifiMac", "Ssid", ns3::SsidValue(ssid));
121 mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
122 ns3::Ptr<ns3::ListPositionAllocator> positionAllocS = ns3::CreateObject<ns3::ListPositionAllocator>();
123 positionAllocS->Add(ns3::Vector(0, 0, 255 * 100 * number_of_networks + 100 * number_of_links));
125 ns3::NetDeviceContainer netDevices;
126 NetPointNs3* access_point_netpoint_ns3 = wifizone->get_access_point()->extension<NetPointNs3>();
128 ns3::Ptr<ns3::Node> access_point_ns3_node = access_point_netpoint_ns3->ns3_node_;
129 ns3::NodeContainer nodes = {access_point_ns3_node};
130 std::vector<NetPointNs3*> hosts_netpoints = {access_point_netpoint_ns3};
131 netDevices.Add(wifi.Install(wifiPhy, wifiMac, access_point_ns3_node));
133 wifiMac.SetType("ns3::StaWifiMac", "Ssid", ns3::SsidValue(ssid), "ActiveProbing", ns3::BooleanValue(false));
135 NetPointNs3* station_netpoint_ns3 = nullptr;
136 ns3::Ptr<ns3::Node> station_ns3_node = nullptr;
139 int nb_stations = wifizone->get_all_hosts().size() - 1;
140 double step = 2 * M_PI / nb_stations;
141 for (auto station_host : wifizone->get_all_hosts()) {
142 station_netpoint_ns3 = station_host->get_netpoint()->extension<NetPointNs3>();
143 if (station_netpoint_ns3 == access_point_netpoint_ns3)
145 hosts_netpoints.push_back(station_netpoint_ns3);
146 distance = station_host->get_property("wifi_distance") ? atof(station_host->get_property("wifi_distance")) : 10.0;
147 positionAllocS->Add(ns3::Vector(distance * std::cos(angle), distance * std::sin(angle),
148 255 * 100 * number_of_networks + 100 * number_of_links));
150 station_ns3_node = station_netpoint_ns3->ns3_node_;
151 nodes.Add(station_ns3_node);
152 netDevices.Add(wifi.Install(wifiPhy, wifiMac, station_ns3_node));
155 const char* start_time = wifizone->get_property("start_time");
156 int start_time_value = start_time ? atoi(start_time) : 0;
157 for (uint32_t i = 0; i < netDevices.GetN(); i++) {
158 ns3::Ptr<ns3::WifiNetDevice> device = ns3::StaticCast<ns3::WifiNetDevice>(netDevices.Get(i));
159 device->GetPhy()->SetOffMode();
160 ns3::Simulator::Schedule(ns3::Seconds(start_time_value), &resumeWifiDevice, device);
163 #if NS3_MINOR_VERSION < 33
164 // This fails with "The channel width does not uniquely identify an operating channel" on v3.34,
165 // so we specified the ChannelWidth of wifiPhy to 40, above, when creating wifiPhy with v3.34 and higher
166 ns3::Config::Set("/NodeList/*/DeviceList/*/$ns3::WifiNetDevice/Phy/ChannelWidth", ns3::UintegerValue(40));
169 mobility.SetPositionAllocator(positionAllocS);
170 mobility.Install(nodes);
172 ns3::Ipv4AddressHelper address;
173 std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links);
174 address.SetBase(addr.c_str(), "255.255.0.0");
175 XBT_DEBUG("\tInterface stack '%s'", addr.c_str());
176 ns3::Ipv4InterfaceContainer addresses = address.Assign(netDevices);
177 for (unsigned int i = 0; i < hosts_netpoints.size(); i++) {
178 hosts_netpoints[i]->ipv4_address_ = transformIpv4Address(addresses.GetAddress(i));
181 if (number_of_links == 255) {
182 xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
184 number_of_networks++;
190 static void clusterCreation_cb(simgrid::kernel::routing::ClusterCreationArgs const& cluster)
192 ns3::NodeContainer Nodes;
194 xbt_assert(cluster.topology == simgrid::kernel::routing::ClusterTopology::FLAT,
195 "NS-3 is supported only by flat clusters. Do not use with other topologies");
197 for (int const& i : cluster.radicals) {
198 // Create private link
199 std::string host_id = cluster.prefix + std::to_string(i) + cluster.suffix;
200 auto* src = simgrid::s4u::Host::by_name(host_id)->get_netpoint();
201 auto* dst = simgrid::s4u::Engine::get_instance()->netpoint_by_name_or_null(cluster.router_id);
202 xbt_assert(dst != nullptr, "No router named %s", cluster.router_id.c_str());
204 ns3_add_direct_route(src, dst, cluster.bw, cluster.lat, cluster.id,
205 cluster.sharing_policy); // Any ns-3 route is symmetrical
207 // Also add the host to the list of hosts that will be connected to the backbone
208 Nodes.Add(src->extension<NetPointNs3>()->ns3_node_);
211 // Create link backbone
213 xbt_assert(Nodes.GetN() <= 65000, "Cluster with ns-3 is limited to 65000 nodes");
214 ns3::CsmaHelper csma;
215 csma.SetChannelAttribute("DataRate",
216 ns3::DataRateValue(ns3::DataRate(cluster.bb_bw * 8))); // ns-3 takes bps, but we provide Bps
217 csma.SetChannelAttribute("Delay", ns3::TimeValue(ns3::Seconds(cluster.bb_lat)));
218 ns3::NetDeviceContainer devices = csma.Install(Nodes);
219 XBT_DEBUG("Create CSMA");
221 std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links);
222 XBT_DEBUG("Assign IP Addresses %s to CSMA.", addr.c_str());
223 ns3::Ipv4AddressHelper ipv4;
224 ipv4.SetBase(addr.c_str(), "255.255.0.0");
225 ipv4.Assign(devices);
227 if (number_of_links == 255) {
228 xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
230 number_of_networks++;
236 static void routeCreation_cb(bool symmetrical, simgrid::kernel::routing::NetPoint* src,
237 simgrid::kernel::routing::NetPoint* dst, simgrid::kernel::routing::NetPoint* /*gw_src*/,
238 simgrid::kernel::routing::NetPoint* /*gw_dst*/,
239 std::vector<simgrid::kernel::resource::LinkImpl*> const& link_list)
241 /* ignoring routes from StarZone, not supported */
242 if (not src || not dst)
245 if (link_list.size() == 1) {
246 auto const* link = static_cast<simgrid::kernel::resource::LinkNS3*>(link_list[0]);
248 XBT_DEBUG("Route from '%s' to '%s' with link '%s' %s %s", src->get_cname(), dst->get_cname(), link->get_cname(),
249 (link->get_sharing_policy() == simgrid::s4u::Link::SharingPolicy::WIFI ? "(wifi)" : "(wired)"),
250 (symmetrical ? "(symmetrical)" : "(not symmetrical)"));
252 // XBT_DEBUG("src (%s), dst (%s), src_id = %d, dst_id = %d",src,dst, src_id, dst_id);
253 XBT_DEBUG("\tLink (%s) bw:%fbps lat:%fs", link->get_cname(), link->get_bandwidth(), link->get_latency());
255 ns3_add_direct_route(src, dst, link->get_bandwidth(), link->get_latency(), link->get_name(),
256 link->get_sharing_policy());
258 static bool warned_about_long_routes = false;
260 if (not warned_about_long_routes)
261 XBT_WARN("Ignoring a route between %s and %s of length %zu: Only routes of length 1 are considered with ns-3.\n"
262 "WARNING: You can ignore this warning if your hosts can still communicate when only considering routes "
264 "WARNING: Remove long routes to avoid this harmless message; subsequent long routes will be silently "
266 src->get_cname(), dst->get_cname(), link_list.size());
267 warned_about_long_routes = true;
274 void surf_network_model_init_NS3()
276 auto net_model = std::make_shared<simgrid::kernel::resource::NetworkNS3Model>("NS3 network model");
277 auto* engine = simgrid::kernel::EngineImpl::get_instance();
278 engine->add_model(net_model);
279 engine->get_netzone_root()->set_network_model(net_model);
282 static simgrid::config::Flag<std::string>
283 ns3_tcp_model("ns3/TcpModel", "The ns-3 tcp model can be: NewReno or Reno or Tahoe", "default");
284 static simgrid::config::Flag<std::string> ns3_seed(
286 "The random seed provided to ns-3. Either 'time' to seed with time(), blank to not set (default), or a number.", "",
287 [](const std::string& val) {
288 if (val.length() == 0)
290 if (strcasecmp(val.c_str(), "time") == 0) {
291 std::srand(time(NULL));
292 ns3::RngSeedManager::SetSeed(std::rand());
293 ns3::RngSeedManager::SetRun(std::rand());
295 int v = xbt_str_parse_int(
296 val.c_str(), "Invalid value for option ns3/seed. It must be either 'time', a number, or left empty.");
297 ns3::RngSeedManager::SetSeed(v);
298 ns3::RngSeedManager::SetRun(v);
306 NetworkNS3Model::NetworkNS3Model(const std::string& name) : NetworkModel(name)
308 xbt_assert(not sg_link_energy_is_inited(),
309 "LinkEnergy plugin and ns-3 network models are not compatible. Are you looking for Ecofen, maybe?");
311 NetPointNs3::EXTENSION_ID = routing::NetPoint::extension_create<NetPointNs3>();
313 ns3::Config::SetDefault("ns3::TcpSocket::SegmentSize", ns3::UintegerValue(1000));
314 ns3::Config::SetDefault("ns3::TcpSocket::DelAckCount", ns3::UintegerValue(1));
315 ns3::Config::SetDefault("ns3::TcpSocketBase::Timestamp", ns3::BooleanValue(false));
317 auto TcpProtocol = ns3_tcp_model.get();
318 if (TcpProtocol == "default") {
321 } else if (TcpProtocol == "Reno" || TcpProtocol == "NewReno" || TcpProtocol == "Tahoe") {
322 XBT_INFO("Switching Tcp protocol to '%s'", TcpProtocol.c_str());
323 ns3::Config::SetDefault("ns3::TcpL4Protocol::SocketType", ns3::StringValue("ns3::Tcp" + TcpProtocol));
326 xbt_die("The ns3/TcpModel must be: NewReno or Reno or Tahoe");
329 routing::NetPoint::on_creation.connect([](routing::NetPoint& pt) {
330 pt.extension_set<NetPointNs3>(new NetPointNs3());
331 XBT_VERB("Declare SimGrid's %s within ns-3", pt.get_cname());
334 s4u::Engine::on_platform_created.connect([]() {
335 /* Create the ns3 topology based on routing strategy */
336 ns3::GlobalRouteManager::BuildGlobalRoutingDatabase();
337 ns3::GlobalRouteManager::InitializeRoutes();
339 routing::on_cluster_creation.connect(&clusterCreation_cb);
340 routing::NetZoneImpl::on_route_creation.connect(&routeCreation_cb);
341 s4u::NetZone::on_seal.connect(&zoneCreation_cb);
344 LinkImpl* NetworkNS3Model::create_link(const std::string& name, const std::vector<double>& bandwidths)
346 xbt_assert(bandwidths.size() == 1, "ns-3 links must use only 1 bandwidth.");
347 auto* link = new LinkNS3(name, bandwidths[0]);
348 link->set_model(this);
352 LinkImpl* NetworkNS3Model::create_wifi_link(const std::string& name, const std::vector<double>& bandwidths)
354 auto* link = create_link(name, bandwidths);
355 link->set_sharing_policy(s4u::Link::SharingPolicy::WIFI, {});
359 Action* NetworkNS3Model::communicate(s4u::Host* src, s4u::Host* dst, double size, double rate)
361 xbt_assert(rate == -1,
362 "Communication over ns-3 links cannot specify a specific rate. Please use -1 as a value instead of %f.",
364 return new NetworkNS3Action(this, size, src, dst);
367 double NetworkNS3Model::next_occurring_event(double now)
369 double time_to_next_flow_completion = 0.0;
370 XBT_DEBUG("ns3_next_occurring_event");
372 // get the first relevant value from the running_actions list
374 // If there is no comms in NS-3, then we do not move it forward.
375 // We will synchronize NS-3 with SimGrid when starting a new communication.
376 // (see NetworkNS3Action::NetworkNS3Action() for more details on this point)
377 if (get_started_action_set()->empty() || now == 0.0)
380 XBT_DEBUG("doing a ns3 simulation for a duration of %f", now);
382 time_to_next_flow_completion = ns3::Simulator::Now().GetSeconds() - EngineImpl::get_clock();
383 // NS-3 stops as soon as a flow ends,
384 // but it does not process the other flows that may finish at the same (simulated) time.
385 // If another flow ends at the same time, time_to_next_flow_completion = 0
386 if (double_equals(time_to_next_flow_completion, 0, sg_surf_precision))
387 time_to_next_flow_completion = 0.0;
389 XBT_DEBUG("min : %f", now);
390 XBT_DEBUG("ns3 time : %f", ns3::Simulator::Now().GetSeconds());
391 XBT_DEBUG("surf time : %f", EngineImpl::get_clock());
392 XBT_DEBUG("Next completion %f :", time_to_next_flow_completion);
394 return time_to_next_flow_completion;
397 void NetworkNS3Model::update_actions_state(double now, double delta)
399 static std::vector<std::string> socket_to_destroy;
401 std::string ns3_socket;
402 for (const auto& elm : flow_from_sock) {
403 ns3_socket = elm.first;
404 SgFlow* sgFlow = elm.second;
405 NetworkNS3Action* action = sgFlow->action_;
406 XBT_DEBUG("Processing flow %p (socket %s, action %p)", sgFlow, ns3_socket.c_str(), action);
407 // Because NS3 stops as soon as a flow is finished, the other flows that ends at the same time may remains in an
408 // inconsistent state (i.e. remains_ == 0 but finished_ == false).
409 // However, SimGrid considers sometimes that an action with remains_ == 0 is finished.
410 // Thus, to avoid inconsistencies between SimGrid and NS3, set remains to 0 only when the flow is finished in NS3
411 int remains = action->get_cost() - sgFlow->sent_bytes_;
413 action->set_remains(remains);
415 if (TRACE_is_enabled() && action->get_state() == kernel::resource::Action::State::STARTED) {
416 double data_delta_sent = sgFlow->sent_bytes_ - action->last_sent_;
418 std::vector<LinkImpl*> route = std::vector<LinkImpl*>();
420 action->get_src().route_to(&action->get_dst(), route, nullptr);
421 for (auto const& link : route)
422 instr::resource_set_utilization("LINK", "bandwidth_used", link->get_cname(), action->get_category(),
423 (data_delta_sent) / delta, now - delta, delta);
425 action->last_sent_ = sgFlow->sent_bytes_;
428 if ((sgFlow->finished_) && (remains <= 0)) { // finished_ should not become true before remains gets to 0, but it
429 // sometimes does. Let's play safe, here.
430 socket_to_destroy.push_back(ns3_socket);
431 XBT_DEBUG("Destroy socket %s of action %p", ns3_socket.c_str(), action);
432 action->set_remains(0);
433 action->finish(Action::State::FINISHED);
435 XBT_DEBUG("Socket %s sent %u bytes out of %u (%u remaining)", ns3_socket.c_str(), sgFlow->sent_bytes_,
436 sgFlow->total_bytes_, sgFlow->remaining_);
440 while (not socket_to_destroy.empty()) {
441 ns3_socket = socket_to_destroy.back();
442 socket_to_destroy.pop_back();
443 SgFlow* flow = flow_from_sock.at(ns3_socket);
444 if (XBT_LOG_ISENABLED(res_ns3, xbt_log_priority_debug)) {
445 XBT_DEBUG("Removing socket %s of action %p", ns3_socket.c_str(), flow->action_);
448 flow_from_sock.erase(ns3_socket);
449 sink_from_sock.erase(ns3_socket);
457 LinkNS3::LinkNS3(const std::string& name, double bandwidth) : LinkImpl(name)
459 bandwidth_.peak = bandwidth;
462 LinkNS3::~LinkNS3() = default;
464 void LinkNS3::apply_event(profile::Event*, double)
469 void LinkNS3::set_bandwidth_profile(profile::Profile* profile)
471 xbt_assert(profile == nullptr, "The ns-3 network model doesn't support bandwidth profiles");
474 void LinkNS3::set_latency_profile(profile::Profile* profile)
476 xbt_assert(profile == nullptr, "The ns-3 network model doesn't support latency profiles");
479 void LinkNS3::set_latency(double latency)
481 latency_.peak = latency;
484 void LinkNS3::set_sharing_policy(s4u::Link::SharingPolicy policy, const s4u::NonLinearResourceCb& cb)
486 sharing_policy_ = policy;
492 NetworkNS3Action::NetworkNS3Action(Model* model, double totalBytes, s4u::Host* src, s4u::Host* dst)
493 : NetworkAction(model, *src, *dst, totalBytes, false)
495 // ns-3 fails when src = dst, so avoid the problem by considering that communications are infinitely fast on the
496 // loopback that does not exists
498 static bool warned = false;
500 XBT_WARN("Sending from a host %s to itself is not supported by ns-3. Every such communication finishes "
501 "immediately upon startup.",
505 finish(Action::State::FINISHED);
509 // If there is no other started actions, we need to move NS-3 forward to be sync with SimGrid
510 if (model->get_started_action_set()->size() == 1) {
511 while (double_positive(EngineImpl::get_clock() - ns3::Simulator::Now().GetSeconds(), sg_surf_precision)) {
512 XBT_DEBUG("Synchronizing NS-3 (time %f) with SimGrid (time %f)", ns3::Simulator::Now().GetSeconds(),
513 EngineImpl::get_clock());
514 ns3_simulator(EngineImpl::get_clock() - ns3::Simulator::Now().GetSeconds());
518 static uint16_t port_number = 1;
520 ns3::Ptr<ns3::Node> src_node = src->get_netpoint()->extension<NetPointNs3>()->ns3_node_;
521 ns3::Ptr<ns3::Node> dst_node = dst->get_netpoint()->extension<NetPointNs3>()->ns3_node_;
523 std::string& addr = dst->get_netpoint()->extension<NetPointNs3>()->ipv4_address_;
524 xbt_assert(not addr.empty(), "Element %s is unknown to ns-3. Is it connected to any one-hop link?",
525 dst->get_netpoint()->get_cname());
527 ns3::PacketSinkHelper sink("ns3::TcpSocketFactory", ns3::InetSocketAddress(ns3::Ipv4Address::GetAny(), port_number));
528 ns3::ApplicationContainer apps = sink.Install(dst_node);
530 ns3::Ptr<ns3::Socket> sock = ns3::Socket::CreateSocket(src_node, ns3::TcpSocketFactory::GetTypeId());
532 XBT_DEBUG("Create socket %s for a flow of %.0f Bytes from %s to %s with Interface %s",
533 transform_socket_ptr(sock).c_str(), totalBytes, src->get_cname(), dst->get_cname(), addr.c_str());
535 flow_from_sock.insert({transform_socket_ptr(sock), new SgFlow(totalBytes, this)});
536 sink_from_sock.insert({transform_socket_ptr(sock), apps});
538 sock->Bind(ns3::InetSocketAddress(port_number));
539 ns3::Simulator::ScheduleNow(&start_flow, sock, addr.c_str(), port_number);
541 port_number = 1 + (port_number % UINT16_MAX);
542 if (port_number == 1)
543 XBT_WARN("Too many connections! Port number is saturated. Trying to use the oldest ports.");
546 void NetworkNS3Action::suspend()
551 void NetworkNS3Action::resume()
556 std::list<LinkImpl*> NetworkNS3Action::get_links() const
560 void NetworkNS3Action::update_remains_lazy(double /*now*/)
565 } // namespace resource
566 } // namespace kernel
567 } // namespace simgrid
569 void ns3_simulator(double maxSeconds)
572 if (maxSeconds > 0.0) // If there is a maximum amount of time to run
573 id = ns3::Simulator::Schedule(ns3::Seconds(maxSeconds), &ns3::Simulator::Stop);
575 XBT_DEBUG("Start simulator for at most %fs (current time: %f)", maxSeconds, simgrid::kernel::EngineImpl::get_clock());
576 ns3::Simulator::Run();
577 XBT_DEBUG("Simulator stopped at %fs", ns3::Simulator::Now().GetSeconds());
579 if (maxSeconds > 0.0)
583 void ns3_add_direct_route(simgrid::kernel::routing::NetPoint* src, simgrid::kernel::routing::NetPoint* dst, double bw,
584 double lat, const std::string& link_name, simgrid::s4u::Link::SharingPolicy policy)
586 ns3::Ipv4AddressHelper address;
587 ns3::NetDeviceContainer netA;
590 auto* host_src = src->extension<NetPointNs3>();
591 auto* host_dst = dst->extension<NetPointNs3>();
593 xbt_assert(host_src != nullptr, "Network element %s does not seem to be ns-3-ready", src->get_cname());
594 xbt_assert(host_dst != nullptr, "Network element %s does not seem to be ns-3-ready", dst->get_cname());
596 xbt_assert(policy != simgrid::s4u::Link::SharingPolicy::WIFI,
597 "The wifi sharing policy is not supported for links. You want to use a wifi zone (see documentation).");
599 ns3::PointToPointHelper pointToPoint;
601 XBT_DEBUG("\tAdd PTP from %s to %s bw:'%f Bps' lat:'%fs'", src->get_cname(), dst->get_cname(), bw, lat);
602 pointToPoint.SetDeviceAttribute("DataRate",
603 ns3::DataRateValue(ns3::DataRate(bw * 8))); // ns-3 takes bps, but we provide Bps
604 pointToPoint.SetChannelAttribute("Delay", ns3::TimeValue(ns3::Seconds(lat)));
606 netA.Add(pointToPoint.Install(host_src->ns3_node_, host_dst->ns3_node_));
608 std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links);
609 address.SetBase(addr.c_str(), "255.255.0.0");
610 XBT_DEBUG("\tInterface stack '%s'", addr.c_str());
612 auto addresses = address.Assign(netA);
614 host_src->ipv4_address_ = transformIpv4Address(addresses.GetAddress(0));
615 host_dst->ipv4_address_ = transformIpv4Address(addresses.GetAddress(1));
617 if (number_of_links == 255) {
618 xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
620 number_of_networks++;