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"
40 #include "surf/surf.hpp"
42 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(res_ns3, res_network, "Network model based on ns-3");
48 extern std::map<std::string, SgFlow*, std::less<>> flow_from_sock;
49 extern std::map<std::string, ns3::ApplicationContainer, std::less<>> sink_from_sock;
51 static ns3::InternetStackHelper stack;
53 static int number_of_links = 1;
54 static int number_of_networks = 1;
57 static ns3::WifiHelper wifi;
58 #if NS3_MINOR_VERSION < 33
59 static ns3::YansWifiPhyHelper wifiPhy = ns3::YansWifiPhyHelper::Default();
61 static ns3::YansWifiPhyHelper wifiPhy;
63 static ns3::YansWifiChannelHelper wifiChannel = ns3::YansWifiChannelHelper::Default();
64 static ns3::WifiMacHelper wifiMac;
65 static ns3::MobilityHelper mobility;
67 simgrid::xbt::Extension<simgrid::kernel::routing::NetPoint, NetPointNs3> NetPointNs3::EXTENSION_ID;
69 static std::string transformIpv4Address(ns3::Ipv4Address from)
71 std::stringstream sstream;
76 NetPointNs3::NetPointNs3() : ns3_node_(ns3::CreateObject<ns3::Node>(0))
78 stack.Install(ns3_node_);
81 static void resumeWifiDevice(ns3::Ptr<ns3::WifiNetDevice> device)
83 device->GetPhy()->ResumeFromOff();
90 static void zoneCreation_cb(simgrid::s4u::NetZone const& zone)
92 simgrid::kernel::routing::WifiZone* wifizone = dynamic_cast<simgrid::kernel::routing::WifiZone*>(zone.get_impl());
93 if (wifizone == nullptr)
96 #if NS3_MINOR_VERSION < 32
97 wifi.SetStandard(ns3::WIFI_PHY_STANDARD_80211n_5GHZ);
99 wifi.SetStandard(ns3::WIFI_STANDARD_80211n_5GHZ);
102 std::string ssid = wifizone->get_name();
103 const char* mcs = wifizone->get_property("mcs");
104 const char* nss = wifizone->get_property("nss");
105 int mcs_value = mcs ? atoi(mcs) : 3;
106 int nss_value = nss ? atoi(nss) : 1;
107 #if NS3_MINOR_VERSION < 30
108 if (nss_value != 1 + (mcs_value / 8))
109 xbt_die("On NS3 < 3.30, NSS value has to satisfy NSS == 1+(MCS/8) constraint. Bailing out");
111 wifi.SetRemoteStationManager("ns3::ConstantRateWifiManager", "ControlMode", ns3::StringValue("HtMcs0"), "DataMode",
112 ns3::StringValue("HtMcs" + std::to_string(mcs_value)));
113 wifiPhy.SetChannel(wifiChannel.Create());
114 wifiPhy.Set("Antennas", ns3::UintegerValue(nss_value));
115 wifiPhy.Set("MaxSupportedTxSpatialStreams", ns3::UintegerValue(nss_value));
116 wifiPhy.Set("MaxSupportedRxSpatialStreams", ns3::UintegerValue(nss_value));
117 wifiMac.SetType("ns3::ApWifiMac", "Ssid", ns3::SsidValue(ssid));
119 mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
120 ns3::Ptr<ns3::ListPositionAllocator> positionAllocS = ns3::CreateObject<ns3::ListPositionAllocator>();
121 positionAllocS->Add(ns3::Vector(0, 0, 255 * 100 * number_of_networks + 100 * number_of_links));
123 ns3::NetDeviceContainer netDevices;
124 NetPointNs3* access_point_netpoint_ns3 = wifizone->get_access_point()->extension<NetPointNs3>();
126 ns3::Ptr<ns3::Node> access_point_ns3_node = access_point_netpoint_ns3->ns3_node_;
127 ns3::NodeContainer nodes = {access_point_ns3_node};
128 std::vector<NetPointNs3*> hosts_netpoints = {access_point_netpoint_ns3};
129 netDevices.Add(wifi.Install(wifiPhy, wifiMac, access_point_ns3_node));
131 wifiMac.SetType("ns3::StaWifiMac", "Ssid", ns3::SsidValue(ssid), "ActiveProbing", ns3::BooleanValue(false));
133 NetPointNs3* station_netpoint_ns3 = nullptr;
134 ns3::Ptr<ns3::Node> station_ns3_node = nullptr;
137 int nb_stations = wifizone->get_all_hosts().size() - 1;
138 double step = 2 * M_PI / nb_stations;
139 for (auto station_host : wifizone->get_all_hosts()) {
140 station_netpoint_ns3 = station_host->get_netpoint()->extension<NetPointNs3>();
141 if (station_netpoint_ns3 == access_point_netpoint_ns3)
143 hosts_netpoints.push_back(station_netpoint_ns3);
144 distance = station_host->get_property("wifi_distance") ? atof(station_host->get_property("wifi_distance")) : 10.0;
145 positionAllocS->Add(ns3::Vector(distance * std::cos(angle), distance * std::sin(angle),
146 255 * 100 * number_of_networks + 100 * number_of_links));
148 station_ns3_node = station_netpoint_ns3->ns3_node_;
149 nodes.Add(station_ns3_node);
150 netDevices.Add(wifi.Install(wifiPhy, wifiMac, station_ns3_node));
153 const char* start_time = wifizone->get_property("start_time");
154 int start_time_value = start_time ? atoi(start_time) : 0;
155 for (uint32_t i = 0; i < netDevices.GetN(); i++) {
156 ns3::Ptr<ns3::WifiNetDevice> device = ns3::StaticCast<ns3::WifiNetDevice>(netDevices.Get(i));
157 device->GetPhy()->SetOffMode();
158 ns3::Simulator::Schedule(ns3::Seconds(start_time_value), &resumeWifiDevice, device);
161 ns3::Config::Set("/NodeList/*/DeviceList/*/$ns3::WifiNetDevice/Phy/ChannelWidth", ns3::UintegerValue(40));
163 mobility.SetPositionAllocator(positionAllocS);
164 mobility.Install(nodes);
166 ns3::Ipv4AddressHelper address;
167 std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links);
168 address.SetBase(addr.c_str(), "255.255.0.0");
169 XBT_DEBUG("\tInterface stack '%s'", addr.c_str());
170 ns3::Ipv4InterfaceContainer addresses = address.Assign(netDevices);
171 for (unsigned int i = 0; i < hosts_netpoints.size(); i++) {
172 hosts_netpoints[i]->ipv4_address_ = transformIpv4Address(addresses.GetAddress(i));
175 if (number_of_links == 255) {
176 xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
178 number_of_networks++;
184 static void clusterCreation_cb(simgrid::kernel::routing::ClusterCreationArgs const& cluster)
186 ns3::NodeContainer Nodes;
188 for (int const& i : *cluster.radicals) {
189 // Create private link
190 std::string host_id = cluster.prefix + std::to_string(i) + cluster.suffix;
191 auto* src = simgrid::s4u::Host::by_name(host_id)->get_netpoint();
192 auto* dst = simgrid::s4u::Engine::get_instance()->netpoint_by_name_or_null(cluster.router_id);
193 xbt_assert(dst != nullptr, "No router named %s", cluster.router_id.c_str());
195 ns3_add_direct_route(src, dst, cluster.bw, cluster.lat, cluster.id,
196 cluster.sharing_policy); // Any ns-3 route is symmetrical
198 // Also add the host to the list of hosts that will be connected to the backbone
199 Nodes.Add(src->extension<NetPointNs3>()->ns3_node_);
202 // Create link backbone
204 xbt_assert(Nodes.GetN() <= 65000, "Cluster with ns-3 is limited to 65000 nodes");
205 ns3::CsmaHelper csma;
206 csma.SetChannelAttribute("DataRate",
207 ns3::DataRateValue(ns3::DataRate(cluster.bb_bw * 8))); // ns-3 takes bps, but we provide Bps
208 csma.SetChannelAttribute("Delay", ns3::TimeValue(ns3::Seconds(cluster.bb_lat)));
209 ns3::NetDeviceContainer devices = csma.Install(Nodes);
210 XBT_DEBUG("Create CSMA");
212 std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links);
213 XBT_DEBUG("Assign IP Addresses %s to CSMA.", addr.c_str());
214 ns3::Ipv4AddressHelper ipv4;
215 ipv4.SetBase(addr.c_str(), "255.255.0.0");
216 ipv4.Assign(devices);
218 if (number_of_links == 255) {
219 xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
221 number_of_networks++;
227 static void routeCreation_cb(bool symmetrical, simgrid::kernel::routing::NetPoint* src,
228 simgrid::kernel::routing::NetPoint* dst, simgrid::kernel::routing::NetPoint* /*gw_src*/,
229 simgrid::kernel::routing::NetPoint* /*gw_dst*/,
230 std::vector<simgrid::kernel::resource::LinkImpl*> const& link_list)
232 if (link_list.size() == 1) {
233 auto const* link = static_cast<simgrid::kernel::resource::LinkNS3*>(link_list[0]);
235 XBT_DEBUG("Route from '%s' to '%s' with link '%s' %s %s", src->get_cname(), dst->get_cname(), link->get_cname(),
236 (link->get_sharing_policy() == simgrid::s4u::Link::SharingPolicy::WIFI ? "(wifi)" : "(wired)"),
237 (symmetrical ? "(symmetrical)" : "(not symmetrical)"));
239 // XBT_DEBUG("src (%s), dst (%s), src_id = %d, dst_id = %d",src,dst, src_id, dst_id);
240 XBT_DEBUG("\tLink (%s) bw:%fbps lat:%fs", link->get_cname(), link->get_bandwidth(), link->get_latency());
242 ns3_add_direct_route(src, dst, link->get_bandwidth(), link->get_latency(), link->get_name(),
243 link->get_sharing_policy());
245 static bool warned_about_long_routes = false;
247 if (not warned_about_long_routes)
248 XBT_WARN("Ignoring a route between %s and %s of length %zu: Only routes of length 1 are considered with ns-3.\n"
249 "WARNING: You can ignore this warning if your hosts can still communicate when only considering routes "
251 "WARNING: Remove long routes to avoid this harmless message; subsequent long routes will be silently "
253 src->get_cname(), dst->get_cname(), link_list.size());
254 warned_about_long_routes = true;
261 void surf_network_model_init_NS3()
263 auto net_model = std::make_shared<simgrid::kernel::resource::NetworkNS3Model>();
264 simgrid::kernel::EngineImpl::get_instance()->add_model(simgrid::kernel::resource::Model::Type::NETWORK, net_model,
266 simgrid::s4u::Engine::get_instance()->get_netzone_root()->get_impl()->set_network_model(net_model);
269 static simgrid::config::Flag<std::string>
270 ns3_tcp_model("ns3/TcpModel", "The ns-3 tcp model can be: NewReno or Reno or Tahoe", "default");
271 static simgrid::config::Flag<std::string> ns3_seed(
273 "The random seed provided to ns-3. Either 'time' to seed with time(), blank to not set (default), or a number.", "",
274 [](std::string val) {
275 if (val.length() == 0)
277 if (strcasecmp(val.c_str(), "time") == 0) {
278 std::srand(time(NULL));
279 ns3::RngSeedManager::SetSeed(std::rand());
280 ns3::RngSeedManager::SetRun(std::rand());
282 int v = xbt_str_parse_int(
283 val.c_str(), "Invalid value for option ns3/seed. It must be either 'time', a number, or left empty.");
284 ns3::RngSeedManager::SetSeed(v);
285 ns3::RngSeedManager::SetRun(v);
293 NetworkNS3Model::NetworkNS3Model()
295 xbt_assert(not sg_link_energy_is_inited(),
296 "LinkEnergy plugin and ns-3 network models are not compatible. Are you looking for Ecofen, maybe?");
298 NetPointNs3::EXTENSION_ID = routing::NetPoint::extension_create<NetPointNs3>();
300 ns3::Config::SetDefault("ns3::TcpSocket::SegmentSize", ns3::UintegerValue(1000));
301 ns3::Config::SetDefault("ns3::TcpSocket::DelAckCount", ns3::UintegerValue(1));
302 ns3::Config::SetDefault("ns3::TcpSocketBase::Timestamp", ns3::BooleanValue(false));
304 auto TcpProtocol = ns3_tcp_model.get();
305 if (TcpProtocol == "default") {
308 } else if (TcpProtocol == "Reno" || TcpProtocol == "NewReno" || TcpProtocol == "Tahoe") {
309 XBT_INFO("Switching Tcp protocol to '%s'", TcpProtocol.c_str());
310 ns3::Config::SetDefault("ns3::TcpL4Protocol::SocketType", ns3::StringValue("ns3::Tcp" + TcpProtocol));
313 xbt_die("The ns3/TcpModel must be: NewReno or Reno or Tahoe");
316 routing::NetPoint::on_creation.connect([](routing::NetPoint& pt) {
317 pt.extension_set<NetPointNs3>(new NetPointNs3());
318 XBT_VERB("Declare SimGrid's %s within ns-3", pt.get_cname());
321 s4u::Engine::on_platform_created.connect([]() {
322 /* Create the ns3 topology based on routing strategy */
323 ns3::GlobalRouteManager::BuildGlobalRoutingDatabase();
324 ns3::GlobalRouteManager::InitializeRoutes();
326 routing::on_cluster_creation.connect(&clusterCreation_cb);
327 s4u::NetZone::on_route_creation.connect(&routeCreation_cb);
328 s4u::NetZone::on_seal.connect(&zoneCreation_cb);
331 LinkImpl* NetworkNS3Model::create_link(const std::string& name, const std::vector<double>& bandwidths,
332 s4u::Link::SharingPolicy policy)
334 xbt_assert(bandwidths.size() == 1, "ns-3 links must use only 1 bandwidth.");
335 auto link = new LinkNS3(name, bandwidths[0], policy);
336 link->set_model(this);
340 Action* NetworkNS3Model::communicate(s4u::Host* src, s4u::Host* dst, double size, double rate)
342 xbt_assert(rate == -1,
343 "Communication over ns-3 links cannot specify a specific rate. Please use -1 as a value instead of %f.",
345 return new NetworkNS3Action(this, size, src, dst);
348 double NetworkNS3Model::next_occurring_event(double now)
350 double time_to_next_flow_completion = 0.0;
351 XBT_DEBUG("ns3_next_occurring_event");
353 // get the first relevant value from the running_actions list
355 // If there is no comms in NS-3, then we do not move it forward.
356 // We will synchronize NS-3 with SimGrid when starting a new communication.
357 // (see NetworkNS3Action::NetworkNS3Action() for more details on this point)
358 if (get_started_action_set()->empty() || now == 0.0)
361 XBT_DEBUG("doing a ns3 simulation for a duration of %f", now);
363 time_to_next_flow_completion = ns3::Simulator::Now().GetSeconds() - surf_get_clock();
364 // NS-3 stops as soon as a flow ends,
365 // but it does not process the other flows that may finish at the same (simulated) time.
366 // If another flow ends at the same time, time_to_next_flow_completion = 0
367 if (double_equals(time_to_next_flow_completion, 0, sg_surf_precision))
368 time_to_next_flow_completion = 0.0;
370 XBT_DEBUG("min : %f", now);
371 XBT_DEBUG("ns3 time : %f", ns3::Simulator::Now().GetSeconds());
372 XBT_DEBUG("surf time : %f", surf_get_clock());
373 XBT_DEBUG("Next completion %f :", time_to_next_flow_completion);
375 return time_to_next_flow_completion;
378 void NetworkNS3Model::update_actions_state(double now, double delta)
380 static std::vector<std::string> socket_to_destroy;
382 std::string ns3_socket;
383 for (const auto& elm : flow_from_sock) {
384 ns3_socket = elm.first;
385 SgFlow* sgFlow = elm.second;
386 NetworkNS3Action* action = sgFlow->action_;
387 XBT_DEBUG("Processing flow %p (socket %s, action %p)", sgFlow, ns3_socket.c_str(), action);
388 // Because NS3 stops as soon as a flow is finished, the other flows that ends at the same time may remains in an
389 // inconsistent state (i.e. remains_ == 0 but finished_ == false).
390 // However, SimGrid considers sometimes that an action with remains_ == 0 is finished.
391 // Thus, to avoid inconsistencies between SimGrid and NS3, set remains to 0 only when the flow is finished in NS3
392 int remains = action->get_cost() - sgFlow->sent_bytes_;
394 action->set_remains(remains);
396 if (TRACE_is_enabled() && action->get_state() == kernel::resource::Action::State::STARTED) {
397 double data_delta_sent = sgFlow->sent_bytes_ - action->last_sent_;
399 std::vector<LinkImpl*> route = std::vector<LinkImpl*>();
401 action->get_src().route_to(&action->get_dst(), route, nullptr);
402 for (auto const& link : route)
403 instr::resource_set_utilization("LINK", "bandwidth_used", link->get_cname(), action->get_category(),
404 (data_delta_sent) / delta, now - delta, delta);
406 action->last_sent_ = sgFlow->sent_bytes_;
409 if ((sgFlow->finished_) && (remains <= 0)) { // finished_ should not become true before remains gets to 0, but it
410 // sometimes does. Let's play safe, here.
411 socket_to_destroy.push_back(ns3_socket);
412 XBT_DEBUG("Destroy socket %s of action %p", ns3_socket.c_str(), action);
413 action->set_remains(0);
414 action->finish(Action::State::FINISHED);
416 XBT_DEBUG("Socket %s sent %u bytes out of %u (%u remaining)", ns3_socket.c_str(), sgFlow->sent_bytes_,
417 sgFlow->total_bytes_, sgFlow->remaining_);
421 while (not socket_to_destroy.empty()) {
422 ns3_socket = socket_to_destroy.back();
423 socket_to_destroy.pop_back();
424 SgFlow* flow = flow_from_sock.at(ns3_socket);
425 if (XBT_LOG_ISENABLED(res_ns3, xbt_log_priority_debug)) {
426 XBT_DEBUG("Removing socket %s of action %p", ns3_socket.c_str(), flow->action_);
429 flow_from_sock.erase(ns3_socket);
430 sink_from_sock.erase(ns3_socket);
438 LinkNS3::LinkNS3(const std::string& name, double bandwidth, s4u::Link::SharingPolicy policy)
439 : LinkImpl(name), sharing_policy_(policy)
441 bandwidth_.peak = bandwidth;
444 LinkNS3::~LinkNS3() = default;
446 void LinkNS3::apply_event(profile::Event*, double)
450 void LinkNS3::set_bandwidth_profile(profile::Profile*)
452 xbt_die("The ns-3 network model doesn't support bandwidth profiles");
454 void LinkNS3::set_latency_profile(profile::Profile*)
456 xbt_die("The ns-3 network model doesn't support latency profiles");
459 LinkImpl* LinkNS3::set_latency(double latency)
461 latency_.peak = latency;
468 NetworkNS3Action::NetworkNS3Action(Model* model, double totalBytes, s4u::Host* src, s4u::Host* dst)
469 : NetworkAction(model, *src, *dst, totalBytes, false)
471 // ns-3 fails when src = dst, so avoid the problem by considering that communications are infinitely fast on the
472 // loopback that does not exists
474 static bool warned = false;
476 XBT_WARN("Sending from a host %s to itself is not supported by ns-3. Every such communication finishes "
477 "immediately upon startup.",
481 finish(Action::State::FINISHED);
485 // If there is no other started actions, we need to move NS-3 forward to be sync with SimGrid
486 if (model->get_started_action_set()->size() == 1) {
487 while (double_positive(surf_get_clock() - ns3::Simulator::Now().GetSeconds(), sg_surf_precision)) {
488 XBT_DEBUG("Synchronizing NS-3 (time %f) with SimGrid (time %f)", ns3::Simulator::Now().GetSeconds(),
490 ns3_simulator(surf_get_clock() - ns3::Simulator::Now().GetSeconds());
494 static uint16_t port_number = 1;
496 ns3::Ptr<ns3::Node> src_node = src->get_netpoint()->extension<NetPointNs3>()->ns3_node_;
497 ns3::Ptr<ns3::Node> dst_node = dst->get_netpoint()->extension<NetPointNs3>()->ns3_node_;
499 std::string& addr = dst->get_netpoint()->extension<NetPointNs3>()->ipv4_address_;
500 xbt_assert(not addr.empty(), "Element %s is unknown to ns-3. Is it connected to any one-hop link?",
501 dst->get_netpoint()->get_cname());
503 ns3::PacketSinkHelper sink("ns3::TcpSocketFactory", ns3::InetSocketAddress(ns3::Ipv4Address::GetAny(), port_number));
504 ns3::ApplicationContainer apps = sink.Install(dst_node);
506 ns3::Ptr<ns3::Socket> sock = ns3::Socket::CreateSocket(src_node, ns3::TcpSocketFactory::GetTypeId());
508 XBT_DEBUG("Create socket %s for a flow of %.0f Bytes from %s to %s with Interface %s",
509 transform_socket_ptr(sock).c_str(), totalBytes, src->get_cname(), dst->get_cname(), addr.c_str());
511 flow_from_sock.insert({transform_socket_ptr(sock), new SgFlow(totalBytes, this)});
512 sink_from_sock.insert({transform_socket_ptr(sock), apps});
514 sock->Bind(ns3::InetSocketAddress(port_number));
515 ns3::Simulator::ScheduleNow(&start_flow, sock, addr.c_str(), port_number);
517 port_number = 1 + (port_number % UINT16_MAX);
518 if (port_number == 1)
519 XBT_WARN("Too many connections! Port number is saturated. Trying to use the oldest ports.");
521 s4u::Link::on_communicate(*this);
524 void NetworkNS3Action::suspend()
529 void NetworkNS3Action::resume()
534 std::list<LinkImpl*> NetworkNS3Action::get_links() const
538 void NetworkNS3Action::update_remains_lazy(double /*now*/)
543 } // namespace resource
544 } // namespace kernel
545 } // namespace simgrid
547 void ns3_simulator(double maxSeconds)
550 if (maxSeconds > 0.0) // If there is a maximum amount of time to run
551 id = ns3::Simulator::Schedule(ns3::Seconds(maxSeconds), &ns3::Simulator::Stop);
553 XBT_DEBUG("Start simulator for at most %fs (current time: %f)", maxSeconds, surf_get_clock());
554 ns3::Simulator::Run();
555 XBT_DEBUG("Simulator stopped at %fs", ns3::Simulator::Now().GetSeconds());
557 if (maxSeconds > 0.0)
561 void ns3_add_direct_route(simgrid::kernel::routing::NetPoint* src, simgrid::kernel::routing::NetPoint* dst, double bw,
562 double lat, const std::string& link_name, simgrid::s4u::Link::SharingPolicy policy)
564 ns3::Ipv4AddressHelper address;
565 ns3::NetDeviceContainer netA;
568 auto* host_src = src->extension<NetPointNs3>();
569 auto* host_dst = dst->extension<NetPointNs3>();
571 xbt_assert(host_src != nullptr, "Network element %s does not seem to be ns-3-ready", src->get_cname());
572 xbt_assert(host_dst != nullptr, "Network element %s does not seem to be ns-3-ready", dst->get_cname());
574 if (policy == simgrid::s4u::Link::SharingPolicy::WIFI) {
575 xbt_die("The wifi sharing policy is not supported for links. You want to use a wifi zone (see documentation).");
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());
590 auto addresses = address.Assign(netA);
592 host_src->ipv4_address_ = transformIpv4Address(addresses.GetAddress(0));
593 host_dst->ipv4_address_ = transformIpv4Address(addresses.GetAddress(1));
595 if (number_of_links == 255) {
596 xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
598 number_of_networks++;