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/core-module.h>
15 #include <ns3/csma-helper.h>
16 #include <ns3/global-route-manager.h>
17 #include <ns3/internet-stack-helper.h>
18 #include <ns3/ipv4-address-helper.h>
19 #include <ns3/packet-sink-helper.h>
20 #include <ns3/point-to-point-helper.h>
21 #include <ns3/application-container.h>
22 #include <ns3/event-id.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/WifiZone.hpp"
32 #include "simgrid/plugins/energy.h"
33 #include "simgrid/s4u/Engine.hpp"
34 #include "simgrid/s4u/NetZone.hpp"
35 #include "src/instr/instr_private.hpp" // TRACE_is_enabled(). FIXME: remove by subscribing tracing to the surf signals
36 #include "src/surf/surf_interface.hpp"
37 #include "src/surf/xml/platf_private.hpp"
38 #include "surf/surf.hpp"
40 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(res_ns3, res_network, "Network model based on ns-3");
46 extern std::map<std::string, SgFlow*, std::less<>> flow_from_sock;
47 extern std::map<std::string, ns3::ApplicationContainer, std::less<>> sink_from_sock;
49 static ns3::InternetStackHelper stack;
51 static int number_of_links = 1;
52 static int number_of_networks = 1;
55 static ns3::WifiHelper wifi;
56 #if NS3_MINOR_VERSION < 33
57 static ns3::YansWifiPhyHelper wifiPhy = ns3::YansWifiPhyHelper::Default();
59 static ns3::YansWifiPhyHelper wifiPhy;
61 static ns3::YansWifiChannelHelper wifiChannel = ns3::YansWifiChannelHelper::Default();
62 static ns3::WifiMacHelper wifiMac;
63 static ns3::MobilityHelper mobility;
65 simgrid::xbt::Extension<simgrid::kernel::routing::NetPoint, NetPointNs3> NetPointNs3::EXTENSION_ID;
67 static std::string transformIpv4Address(ns3::Ipv4Address from)
69 std::stringstream sstream;
74 NetPointNs3::NetPointNs3() : ns3_node_(ns3::CreateObject<ns3::Node>(0))
76 stack.Install(ns3_node_);
79 void resumeWifiDevice(ns3::Ptr<ns3::WifiNetDevice> device) {
80 device->GetPhy()->ResumeFromOff();
87 static void zoneCreation_cb(simgrid::s4u::NetZone const& zone) {
88 simgrid::kernel::routing::WifiZone* wifizone = dynamic_cast<simgrid::kernel::routing::WifiZone*> (zone.get_impl());
89 if (wifizone == nullptr) return;
91 #if NS3_MINOR_VERSION < 32
92 wifi.SetStandard(ns3::WIFI_PHY_STANDARD_80211n_5GHZ);
94 wifi.SetStandard(ns3::WIFI_STANDARD_80211n_5GHZ);
97 std::string ssid = wifizone->get_name();
98 const char* mcs = wifizone->get_property("mcs");
99 const char* nss = wifizone->get_property("nss");
100 int mcs_value = mcs ? atoi(mcs) : 3;
101 int nss_value = nss ? atoi(nss) : 1;
102 #if NS3_MINOR_VERSION < 30
103 if(nss_value != 1+(mcs_value/8))
104 xbt_die("On NS3 < 3.30, NSS value has to satisfy NSS == 1+(MCS/8) constraint. Bailing out");
106 wifi.SetRemoteStationManager("ns3::ConstantRateWifiManager",
107 "ControlMode", ns3::StringValue("HtMcs0"),
108 "DataMode", ns3::StringValue("HtMcs" + std::to_string(mcs_value)));
109 wifiPhy.SetChannel(wifiChannel.Create());
110 wifiPhy.Set("Antennas", ns3::UintegerValue(nss_value));
111 wifiPhy.Set("MaxSupportedTxSpatialStreams", ns3::UintegerValue(nss_value));
112 wifiPhy.Set("MaxSupportedRxSpatialStreams", ns3::UintegerValue(nss_value));
113 wifiMac.SetType("ns3::ApWifiMac",
114 "Ssid", ns3::SsidValue(ssid));
116 mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
117 ns3::Ptr<ns3::ListPositionAllocator> positionAllocS = ns3::CreateObject<ns3::ListPositionAllocator>();
118 positionAllocS->Add(ns3::Vector(0, 0, 255 * 100 * number_of_networks + 100 * number_of_links));
120 ns3::NetDeviceContainer netDevices;
121 NetPointNs3* access_point_netpoint_ns3 = wifizone->get_access_point()->extension<NetPointNs3>();
123 ns3::Ptr<ns3::Node> access_point_ns3_node = access_point_netpoint_ns3->ns3_node_;
124 ns3::NodeContainer nodes = {access_point_ns3_node};
125 std::vector<NetPointNs3*> hosts_netpoints = {access_point_netpoint_ns3};
126 netDevices.Add(wifi.Install(wifiPhy, wifiMac,access_point_ns3_node));
128 wifiMac.SetType ("ns3::StaWifiMac",
129 "Ssid", ns3::SsidValue(ssid),
130 "ActiveProbing", ns3::BooleanValue(false));
132 NetPointNs3* station_netpoint_ns3 = nullptr;
133 ns3::Ptr<ns3::Node> station_ns3_node = nullptr;
136 int nb_stations = wifizone->get_all_hosts().size() - 1;
137 double step = 2 * M_PI / nb_stations;
138 for (auto station_host : wifizone->get_all_hosts()) {
139 station_netpoint_ns3 = station_host->get_netpoint()->extension<NetPointNs3>();
140 if (station_netpoint_ns3 == access_point_netpoint_ns3)
142 hosts_netpoints.push_back(station_netpoint_ns3);
143 distance = station_host->get_property("wifi_distance") ? atof(station_host->get_property("wifi_distance")) : 10.0;
144 positionAllocS->Add(ns3::Vector(distance * std::cos(angle), distance * std::sin(angle), 255 * 100 * number_of_networks + 100 * number_of_links));
146 station_ns3_node = station_netpoint_ns3->ns3_node_;
147 nodes.Add(station_ns3_node);
148 netDevices.Add(wifi.Install(wifiPhy, wifiMac, station_ns3_node));
151 const char* start_time = wifizone->get_property("start_time");
152 int start_time_value = start_time ? atoi(start_time) : 0;
153 auto resume = [](ns3::Ptr<ns3::WifiNetDevice> device){device->GetPhy()->ResumeFromOff();};
154 for (int i = 0; i < netDevices.GetN(); i++) {
155 ns3::Ptr<ns3::WifiNetDevice> device = ns3::StaticCast<ns3::WifiNetDevice>(netDevices.Get(i));
156 device->GetPhy()->SetOffMode();
157 ns3::Simulator::Schedule(
158 ns3::Seconds(start_time_value),
163 ns3::Config::Set("/NodeList/*/DeviceList/*/$ns3::WifiNetDevice/Phy/ChannelWidth", ns3::UintegerValue(40));
165 mobility.SetPositionAllocator(positionAllocS);
166 mobility.Install(nodes);
168 ns3::Ipv4AddressHelper address;
169 std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links);
170 address.SetBase(addr.c_str(), "255.255.0.0");
171 XBT_DEBUG("\tInterface stack '%s'", addr.c_str());
172 ns3::Ipv4InterfaceContainer addresses = address.Assign(netDevices);
173 for (unsigned int i = 0; i < hosts_netpoints.size(); i++) {
174 hosts_netpoints[i]->ipv4_address_ = transformIpv4Address(addresses.GetAddress(i));
177 if (number_of_links == 255) {
178 xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
180 number_of_networks++;
186 static void clusterCreation_cb(simgrid::kernel::routing::ClusterCreationArgs const& cluster)
188 ns3::NodeContainer Nodes;
190 for (int const& i : *cluster.radicals) {
191 // Create private link
192 std::string host_id = cluster.prefix + std::to_string(i) + cluster.suffix;
193 auto* src = simgrid::s4u::Host::by_name(host_id)->get_netpoint();
194 auto* dst = simgrid::s4u::Engine::get_instance()->netpoint_by_name_or_null(cluster.router_id);
195 xbt_assert(dst != nullptr, "No router named %s", cluster.router_id.c_str());
197 ns3_add_direct_route(src, dst, cluster.bw, cluster.lat, cluster.id,
198 cluster.sharing_policy); // Any ns-3 route is symmetrical
200 // Also add the host to the list of hosts that will be connected to the backbone
201 Nodes.Add(src->extension<NetPointNs3>()->ns3_node_);
204 // Create link backbone
206 xbt_assert(Nodes.GetN() <= 65000, "Cluster with ns-3 is limited to 65000 nodes");
207 ns3::CsmaHelper csma;
208 csma.SetChannelAttribute("DataRate",
209 ns3::DataRateValue(ns3::DataRate(cluster.bb_bw * 8))); // ns-3 takes bps, but we provide Bps
210 csma.SetChannelAttribute("Delay", ns3::TimeValue(ns3::Seconds(cluster.bb_lat)));
211 ns3::NetDeviceContainer devices = csma.Install(Nodes);
212 XBT_DEBUG("Create CSMA");
214 std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links);
215 XBT_DEBUG("Assign IP Addresses %s to CSMA.", addr.c_str());
216 ns3::Ipv4AddressHelper ipv4;
217 ipv4.SetBase(addr.c_str(), "255.255.0.0");
218 ipv4.Assign(devices);
220 if (number_of_links == 255) {
221 xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
223 number_of_networks++;
229 static void routeCreation_cb(bool symmetrical, simgrid::kernel::routing::NetPoint* src,
230 simgrid::kernel::routing::NetPoint* dst, simgrid::kernel::routing::NetPoint* /*gw_src*/,
231 simgrid::kernel::routing::NetPoint* /*gw_dst*/,
232 std::vector<simgrid::kernel::resource::LinkImpl*> const& link_list)
234 if (link_list.size() == 1) {
235 auto const* link = static_cast<simgrid::kernel::resource::LinkNS3*>(link_list[0]);
237 XBT_DEBUG("Route from '%s' to '%s' with link '%s' %s %s", src->get_cname(), dst->get_cname(), link->get_cname(),
238 (link->get_sharing_policy() == simgrid::s4u::Link::SharingPolicy::WIFI ? "(wifi)" : "(wired)"),
239 (symmetrical ? "(symmetrical)" : "(not symmetrical)"));
241 // XBT_DEBUG("src (%s), dst (%s), src_id = %d, dst_id = %d",src,dst, src_id, dst_id);
242 XBT_DEBUG("\tLink (%s) bw:%fbps lat:%fs", link->get_cname(), link->get_bandwidth(), link->get_latency());
244 ns3_add_direct_route(src, dst, link->get_bandwidth(), link->get_latency(), link->get_name(),
245 link->get_sharing_policy());
247 static bool warned_about_long_routes = false;
249 if (not warned_about_long_routes)
250 XBT_WARN("Ignoring a route between %s and %s of length %zu: Only routes of length 1 are considered with ns-3.\n"
251 "WARNING: You can ignore this warning if your hosts can still communicate when only considering routes "
253 "WARNING: Remove long routes to avoid this harmless message; subsequent long routes will be silently "
255 src->get_cname(), dst->get_cname(), link_list.size());
256 warned_about_long_routes = true;
263 void surf_network_model_init_NS3()
265 xbt_assert(surf_network_model == nullptr, "Cannot set the network model twice");
267 surf_network_model = new simgrid::kernel::resource::NetworkNS3Model();
270 static simgrid::config::Flag<std::string>
271 ns3_tcp_model("ns3/TcpModel", "The ns-3 tcp model can be: NewReno or Reno or Tahoe", "default");
272 static simgrid::config::Flag<std::string> ns3_seed(
274 "The random seed provided to ns-3. Either 'time' to seed with time(), blank to not set (default), or a number.", "",
275 [](std::string val) {
276 if (val.length() == 0)
278 if (strcasecmp(val.c_str(), "time") == 0) {
279 std::srand(time(NULL));
280 ns3::RngSeedManager::SetSeed(std::rand());
281 ns3::RngSeedManager::SetRun(std::rand());
283 int v = xbt_str_parse_int(
284 val.c_str(), "Invalid value for option ns3/seed. It must be either 'time', a number, or left empty.");
285 ns3::RngSeedManager::SetSeed(v);
286 ns3::RngSeedManager::SetRun(v);
294 NetworkNS3Model::NetworkNS3Model() : NetworkModel(Model::UpdateAlgo::FULL)
296 xbt_assert(not sg_link_energy_is_inited(),
297 "LinkEnergy plugin and ns-3 network models are not compatible. Are you looking for Ecofen, maybe?");
299 all_existing_models.push_back(this);
301 NetPointNs3::EXTENSION_ID = routing::NetPoint::extension_create<NetPointNs3>();
303 ns3::Config::SetDefault("ns3::TcpSocket::SegmentSize", ns3::UintegerValue(1000));
304 ns3::Config::SetDefault("ns3::TcpSocket::DelAckCount", ns3::UintegerValue(1));
305 ns3::Config::SetDefault("ns3::TcpSocketBase::Timestamp", ns3::BooleanValue(false));
307 auto TcpProtocol = ns3_tcp_model.get();
308 if (TcpProtocol == "default") {
311 } else if (TcpProtocol == "Reno" || TcpProtocol == "NewReno" || TcpProtocol == "Tahoe") {
312 XBT_INFO("Switching Tcp protocol to '%s'", TcpProtocol.c_str());
313 ns3::Config::SetDefault("ns3::TcpL4Protocol::SocketType", ns3::StringValue("ns3::Tcp" + TcpProtocol));
316 xbt_die("The ns3/TcpModel must be: NewReno or Reno or Tahoe");
319 routing::NetPoint::on_creation.connect([](routing::NetPoint& pt) {
320 pt.extension_set<NetPointNs3>(new NetPointNs3());
321 XBT_VERB("Declare SimGrid's %s within ns-3", pt.get_cname());
324 s4u::Engine::on_platform_created.connect([]() {
325 /* Create the ns3 topology based on routing strategy */
326 ns3::GlobalRouteManager::BuildGlobalRoutingDatabase();
327 ns3::GlobalRouteManager::InitializeRoutes();
329 routing::on_cluster_creation.connect(&clusterCreation_cb);
330 s4u::NetZone::on_route_creation.connect(&routeCreation_cb);
331 s4u::NetZone::on_seal.connect(&zoneCreation_cb);
334 LinkImpl* NetworkNS3Model::create_link(const std::string& name, const std::vector<double>& bandwidths, double latency,
335 s4u::Link::SharingPolicy policy)
337 xbt_assert(bandwidths.size() == 1, "ns-3 links must use only 1 bandwidth.");
338 return new LinkNS3(this, name, bandwidths[0], latency, policy);
341 Action* NetworkNS3Model::communicate(s4u::Host* src, s4u::Host* dst, double size, double rate)
343 xbt_assert(rate == -1,
344 "Communication over ns-3 links cannot specify a specific rate. Please use -1 as a value instead of %f.",
346 return new NetworkNS3Action(this, size, src, dst);
349 double NetworkNS3Model::next_occurring_event(double now)
351 double time_to_next_flow_completion = 0.0;
352 XBT_DEBUG("ns3_next_occurring_event");
354 //get the first relevant value from the running_actions list
356 // If there is no comms in NS-3, then we do not move it forward.
357 // We will synchronize NS-3 with SimGrid when starting a new communication.
358 // (see NetworkNS3Action::NetworkNS3Action() for more details on this point)
359 if (get_started_action_set()->empty() || now == 0.0)
362 XBT_DEBUG("doing a ns3 simulation for a duration of %f", now);
364 time_to_next_flow_completion = ns3::Simulator::Now().GetSeconds() - surf_get_clock();
365 // NS-3 stops as soon as a flow ends,
366 // but it does not process the other flows that may finish at the same (simulated) time.
367 // If another flow ends at the same time, time_to_next_flow_completion = 0
368 if(double_equals(time_to_next_flow_completion, 0, sg_surf_precision))
369 time_to_next_flow_completion = 0.0;
371 XBT_DEBUG("min : %f", now);
372 XBT_DEBUG("ns3 time : %f", ns3::Simulator::Now().GetSeconds());
373 XBT_DEBUG("surf time : %f", surf_get_clock());
374 XBT_DEBUG("Next completion %f :", time_to_next_flow_completion);
376 return time_to_next_flow_completion;
379 void NetworkNS3Model::update_actions_state(double now, double delta)
381 static std::vector<std::string> socket_to_destroy;
383 std::string ns3_socket;
384 for (const auto& elm : flow_from_sock) {
385 ns3_socket = elm.first;
386 SgFlow* sgFlow = elm.second;
387 NetworkNS3Action * action = sgFlow->action_;
388 XBT_DEBUG("Processing flow %p (socket %s, action %p)", sgFlow, ns3_socket.c_str(), action);
389 // Because NS3 stops as soon as a flow is finished, the other flows that ends at the same time may remains in an
390 // inconsistent state (i.e. remains_ == 0 but finished_ == false).
391 // However, SimGrid considers sometimes that an action with remains_ == 0 is finished.
392 // Thus, to avoid inconsistencies between SimGrid and NS3, set remains to 0 only when the flow is finished in NS3
393 int remains = action->get_cost() - sgFlow->sent_bytes_;
395 action->set_remains(remains);
397 if (TRACE_is_enabled() && action->get_state() == kernel::resource::Action::State::STARTED) {
398 double data_delta_sent = sgFlow->sent_bytes_ - action->last_sent_;
400 std::vector<LinkImpl*> route = std::vector<LinkImpl*>();
402 action->get_src().route_to(&action->get_dst(), route, nullptr);
403 for (auto const& link : route)
404 instr::resource_set_utilization("LINK", "bandwidth_used", link->get_cname(), action->get_category(),
405 (data_delta_sent) / delta, now - delta, delta);
407 action->last_sent_ = sgFlow->sent_bytes_;
410 if ((sgFlow->finished_) && (remains <= 0)) { // finished_ should not become true before remains gets to 0, but it 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(NetworkNS3Model* model, const std::string& name, double bandwidth, double latency,
439 s4u::Link::SharingPolicy policy)
440 : LinkImpl(model, name, nullptr), sharing_policy_(policy)
442 bandwidth_.peak = bandwidth;
443 latency_.peak = latency;
445 s4u::Link::on_creation(*this->get_iface());
448 LinkNS3::~LinkNS3() = default;
450 void LinkNS3::apply_event(profile::Event*, double)
454 void LinkNS3::set_bandwidth_profile(profile::Profile*)
456 xbt_die("The ns-3 network model doesn't support bandwidth profiles");
458 void LinkNS3::set_latency_profile(profile::Profile*)
460 xbt_die("The ns-3 network model doesn't support latency profiles");
467 NetworkNS3Action::NetworkNS3Action(Model* model, double totalBytes, s4u::Host* src, s4u::Host* dst)
468 : NetworkAction(model, *src, *dst, totalBytes, false)
470 // ns-3 fails when src = dst, so avoid the problem by considering that communications are infinitely fast on the
471 // loopback that does not exists
473 static bool warned = false;
475 XBT_WARN("Sending from a host %s to itself is not supported by ns-3. Every such communication finishes "
476 "immediately upon startup.",
480 finish(Action::State::FINISHED);
484 // If there is no other started actions, we need to move NS-3 forward to be sync with SimGrid
485 if (model->get_started_action_set()->size()==1){
486 while(double_positive(surf_get_clock() - ns3::Simulator::Now().GetSeconds(), sg_surf_precision)){
487 XBT_DEBUG("Synchronizing NS-3 (time %f) with SimGrid (time %f)", ns3::Simulator::Now().GetSeconds(), surf_get_clock());
488 ns3_simulator(surf_get_clock() - ns3::Simulator::Now().GetSeconds());
492 static uint16_t port_number = 1;
494 ns3::Ptr<ns3::Node> src_node = src->get_netpoint()->extension<NetPointNs3>()->ns3_node_;
495 ns3::Ptr<ns3::Node> dst_node = dst->get_netpoint()->extension<NetPointNs3>()->ns3_node_;
497 std::string& addr = dst->get_netpoint()->extension<NetPointNs3>()->ipv4_address_;
498 xbt_assert(not addr.empty(), "Element %s is unknown to ns-3. Is it connected to any one-hop link?",
499 dst->get_netpoint()->get_cname());
501 ns3::PacketSinkHelper sink("ns3::TcpSocketFactory", ns3::InetSocketAddress(ns3::Ipv4Address::GetAny(), port_number));
502 ns3::ApplicationContainer apps = sink.Install(dst_node);
504 ns3::Ptr<ns3::Socket> sock = ns3::Socket::CreateSocket(src_node, ns3::TcpSocketFactory::GetTypeId());
506 XBT_DEBUG("Create socket %s for a flow of %.0f Bytes from %s to %s with Interface %s",
507 transform_socket_ptr(sock).c_str(), totalBytes, src->get_cname(), dst->get_cname(), addr.c_str());
509 flow_from_sock.insert({transform_socket_ptr(sock), new SgFlow(totalBytes, this)});
510 sink_from_sock.insert({transform_socket_ptr(sock), apps});
512 sock->Bind(ns3::InetSocketAddress(port_number));
513 ns3::Simulator::ScheduleNow(&start_flow, sock, addr.c_str(), port_number);
515 port_number = 1 + (port_number % UINT16_MAX);
516 if (port_number == 1)
517 XBT_WARN("Too many connections! Port number is saturated. Trying to use the oldest ports.");
519 s4u::Link::on_communicate(*this);
522 void NetworkNS3Action::suspend() {
526 void NetworkNS3Action::resume() {
530 std::list<LinkImpl*> NetworkNS3Action::get_links() const
534 void NetworkNS3Action::update_remains_lazy(double /*now*/)
539 } // namespace resource
540 } // namespace kernel
541 } // namespace simgrid
543 void ns3_simulator(double maxSeconds)
546 if (maxSeconds > 0.0) // If there is a maximum amount of time to run
547 id = ns3::Simulator::Schedule(ns3::Seconds(maxSeconds), &ns3::Simulator::Stop);
549 XBT_DEBUG("Start simulator for at most %fs (current time: %f)", maxSeconds, surf_get_clock());
550 ns3::Simulator::Run ();
551 XBT_DEBUG("Simulator stopped at %fs", ns3::Simulator::Now().GetSeconds());
557 void ns3_add_direct_route(simgrid::kernel::routing::NetPoint* src, simgrid::kernel::routing::NetPoint* dst, double bw,
558 double lat, const std::string& link_name, simgrid::s4u::Link::SharingPolicy policy)
560 ns3::Ipv4AddressHelper address;
561 ns3::NetDeviceContainer netA;
564 auto* host_src = src->extension<NetPointNs3>();
565 auto* host_dst = dst->extension<NetPointNs3>();
567 xbt_assert(host_src != nullptr, "Network element %s does not seem to be ns-3-ready", src->get_cname());
568 xbt_assert(host_dst != nullptr, "Network element %s does not seem to be ns-3-ready", dst->get_cname());
570 if (policy == simgrid::s4u::Link::SharingPolicy::WIFI) {
571 xbt_die("The wifi sharing policy is not supported for links. You want to use a wifi zone (see documentation).");
573 ns3::PointToPointHelper pointToPoint;
575 XBT_DEBUG("\tAdd PTP from %s to %s bw:'%f Bps' lat:'%fs'", src->get_cname(), dst->get_cname(), bw, lat);
576 pointToPoint.SetDeviceAttribute("DataRate",
577 ns3::DataRateValue(ns3::DataRate(bw * 8))); // ns-3 takes bps, but we provide Bps
578 pointToPoint.SetChannelAttribute("Delay", ns3::TimeValue(ns3::Seconds(lat)));
580 netA.Add(pointToPoint.Install(host_src->ns3_node_, host_dst->ns3_node_));
582 std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links);
583 address.SetBase(addr.c_str(), "255.255.0.0");
584 XBT_DEBUG("\tInterface stack '%s'", addr.c_str());
586 auto addresses = address.Assign(netA);
588 host_src->ipv4_address_ = transformIpv4Address(addresses.GetAddress(0));
589 host_dst->ipv4_address_ = transformIpv4Address(addresses.GetAddress(1));
591 if (number_of_links == 255) {
592 xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
594 number_of_networks++;