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"
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(ns3, surf, "Logging specific to the SURF network ns-3 module");
46 extern std::map<std::string, SgFlow*> flow_from_sock;
47 extern std::map<std::string, ns3::ApplicationContainer> 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 static ns3::YansWifiPhyHelper wifiPhy = ns3::YansWifiPhyHelper::Default();
57 static ns3::YansWifiChannelHelper wifiChannel = ns3::YansWifiChannelHelper::Default();
58 static ns3::WifiMacHelper wifiMac;
59 static ns3::MobilityHelper mobility;
61 simgrid::xbt::Extension<simgrid::kernel::routing::NetPoint, NetPointNs3> NetPointNs3::EXTENSION_ID;
63 static std::string transformIpv4Address(ns3::Ipv4Address from)
65 std::stringstream sstream;
70 NetPointNs3::NetPointNs3() : ns3_node_(ns3::CreateObject<ns3::Node>(0))
72 stack.Install(ns3_node_);
79 static void zoneCreation_cb(simgrid::s4u::NetZone const& zone) {
80 simgrid::kernel::routing::WifiZone* wifizone = dynamic_cast<simgrid::kernel::routing::WifiZone*> (zone.get_impl());
81 if (wifizone == nullptr) return;
83 wifi.SetStandard(ns3::WIFI_PHY_STANDARD_80211n_5GHZ);
85 std::string ssid = wifizone->get_name();
86 const char* mcs = wifizone->get_property("mcs");
87 const char* nss = wifizone->get_property("nss");
88 int mcs_value = mcs ? atoi(mcs) : 3;
89 int nss_value = nss ? atoi(nss) : 1;
90 wifi.SetRemoteStationManager("ns3::ConstantRateWifiManager",
91 "ControlMode", ns3::StringValue("HtMcs0"),
92 "DataMode", ns3::StringValue("HtMcs" + std::to_string(mcs_value)));
93 wifiPhy.SetChannel(wifiChannel.Create());
94 wifiPhy.Set("Antennas", ns3::UintegerValue(nss_value));
95 wifiPhy.Set("MaxSupportedTxSpatialStreams", ns3::UintegerValue(nss_value));
96 wifiPhy.Set("MaxSupportedRxSpatialStreams", ns3::UintegerValue(nss_value));
97 wifiMac.SetType("ns3::ApWifiMac",
98 "Ssid", ns3::SsidValue(ssid));
100 mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
101 ns3::Ptr<ns3::ListPositionAllocator> positionAllocS = ns3::CreateObject<ns3::ListPositionAllocator>();
102 positionAllocS->Add(ns3::Vector(0, 0, 255 * 100 * number_of_networks + 100 * number_of_links));
104 ns3::NetDeviceContainer netDevices;
105 NetPointNs3* access_point_netpoint_ns3 = wifizone->get_access_point()->extension<NetPointNs3>();
107 ns3::Ptr<ns3::Node> access_point_ns3_node = access_point_netpoint_ns3->ns3_node_;
108 ns3::NodeContainer nodes = {access_point_ns3_node};
109 std::vector<NetPointNs3*> hosts_netpoints = {access_point_netpoint_ns3};
110 netDevices.Add(wifi.Install(wifiPhy, wifiMac,access_point_ns3_node));
112 wifiMac.SetType ("ns3::StaWifiMac",
113 "Ssid", ns3::SsidValue(ssid),
114 "ActiveProbing", ns3::BooleanValue(false));
116 NetPointNs3* station_netpoint_ns3 = nullptr;
117 ns3::Ptr<ns3::Node> station_ns3_node = nullptr;
120 int nb_stations = wifizone->get_all_hosts().size() - 1;
121 double step = 2 * M_PI / nb_stations;
122 for (auto station_host : wifizone->get_all_hosts()) {
123 station_netpoint_ns3 = station_host->get_netpoint()->extension<NetPointNs3>();
124 if (station_netpoint_ns3 == access_point_netpoint_ns3)
126 hosts_netpoints.push_back(station_netpoint_ns3);
127 distance = station_host->get_property("wifi_distance") ? atof(station_host->get_property("wifi_distance")) : 10.0;
128 positionAllocS->Add(ns3::Vector(distance * std::cos(angle), distance * std::sin(angle), 255 * 100 * number_of_networks + 100 * number_of_links));
130 station_ns3_node = station_netpoint_ns3->ns3_node_;
131 nodes.Add(station_ns3_node);
132 netDevices.Add(wifi.Install(wifiPhy, wifiMac, station_ns3_node));
135 ns3::Config::Set("/NodeList/*/DeviceList/*/$ns3::WifiNetDevice/Phy/ChannelWidth", ns3::UintegerValue(40));
137 mobility.SetPositionAllocator(positionAllocS);
138 mobility.Install(nodes);
140 ns3::Ipv4AddressHelper address;
141 std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links);
142 address.SetBase(addr.c_str(), "255.255.0.0");
143 XBT_DEBUG("\tInterface stack '%s'", addr.c_str());
144 ns3::Ipv4InterfaceContainer addresses = address.Assign(netDevices);
145 for (int i = 0; i < hosts_netpoints.size(); i++) {
146 hosts_netpoints[i]->ipv4_address_ = transformIpv4Address(addresses.GetAddress(i));
149 if (number_of_links == 255) {
150 xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
152 number_of_networks++;
158 static void clusterCreation_cb(simgrid::kernel::routing::ClusterCreationArgs const& cluster)
160 ns3::NodeContainer Nodes;
162 for (int const& i : *cluster.radicals) {
163 // Create private link
164 std::string host_id = cluster.prefix + std::to_string(i) + cluster.suffix;
165 auto* src = simgrid::s4u::Host::by_name(host_id)->get_netpoint();
166 auto* dst = simgrid::s4u::Engine::get_instance()->netpoint_by_name_or_null(cluster.router_id);
167 xbt_assert(dst != nullptr, "No router named %s", cluster.router_id.c_str());
169 ns3_add_direct_route(src, dst, cluster.bw, cluster.lat, cluster.id,
170 cluster.sharing_policy); // Any ns-3 route is symmetrical
172 // Also add the host to the list of hosts that will be connected to the backbone
173 Nodes.Add(src->extension<NetPointNs3>()->ns3_node_);
176 // Create link backbone
178 xbt_assert(Nodes.GetN() <= 65000, "Cluster with ns-3 is limited to 65000 nodes");
179 ns3::CsmaHelper csma;
180 csma.SetChannelAttribute("DataRate",
181 ns3::DataRateValue(ns3::DataRate(cluster.bb_bw * 8))); // ns-3 takes bps, but we provide Bps
182 csma.SetChannelAttribute("Delay", ns3::TimeValue(ns3::Seconds(cluster.bb_lat)));
183 ns3::NetDeviceContainer devices = csma.Install(Nodes);
184 XBT_DEBUG("Create CSMA");
186 std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links);
187 XBT_DEBUG("Assign IP Addresses %s to CSMA.", addr.c_str());
188 ns3::Ipv4AddressHelper ipv4;
189 ipv4.SetBase(addr.c_str(), "255.255.0.0");
190 ipv4.Assign(devices);
192 if (number_of_links == 255) {
193 xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
195 number_of_networks++;
201 static void routeCreation_cb(bool symmetrical, simgrid::kernel::routing::NetPoint* src,
202 simgrid::kernel::routing::NetPoint* dst, simgrid::kernel::routing::NetPoint* /*gw_src*/,
203 simgrid::kernel::routing::NetPoint* /*gw_dst*/,
204 std::vector<simgrid::kernel::resource::LinkImpl*> const& link_list)
206 if (link_list.size() == 1) {
207 auto const* link = static_cast<simgrid::kernel::resource::LinkNS3*>(link_list[0]);
209 XBT_DEBUG("Route from '%s' to '%s' with link '%s' %s %s", src->get_cname(), dst->get_cname(), link->get_cname(),
210 (link->get_sharing_policy() == simgrid::s4u::Link::SharingPolicy::WIFI ? "(wifi)" : "(wired)"),
211 (symmetrical ? "(symmetrical)" : "(not symmetrical)"));
213 // XBT_DEBUG("src (%s), dst (%s), src_id = %d, dst_id = %d",src,dst, src_id, dst_id);
214 XBT_DEBUG("\tLink (%s) bw:%fbps lat:%fs", link->get_cname(), link->get_bandwidth(), link->get_latency());
216 ns3_add_direct_route(src, dst, link->get_bandwidth(), link->get_latency(), link->get_name(),
217 link->get_sharing_policy());
219 static bool warned_about_long_routes = false;
221 if (not warned_about_long_routes)
222 XBT_WARN("Ignoring a route between %s and %s of length %zu: Only routes of length 1 are considered with ns-3.\n"
223 "WARNING: You can ignore this warning if your hosts can still communicate when only considering routes "
225 "WARNING: Remove long routes to avoid this harmless message; subsequent long routes will be silently "
227 src->get_cname(), dst->get_cname(), link_list.size());
228 warned_about_long_routes = true;
235 void surf_network_model_init_NS3()
237 xbt_assert(surf_network_model == nullptr, "Cannot set the network model twice");
239 surf_network_model = new simgrid::kernel::resource::NetworkNS3Model();
242 static simgrid::config::Flag<std::string>
243 ns3_tcp_model("ns3/TcpModel", "The ns-3 tcp model can be: NewReno or Reno or Tahoe", "default");
244 static simgrid::config::Flag<std::string> ns3_seed(
246 "The random seed provided to ns-3. Either 'time' to seed with time(), blank to not set (default), or a number.", "",
247 [](std::string val) {
248 if (val.length() == 0)
250 if (strcasecmp(val.c_str(), "time") == 0) {
251 std::srand(time(NULL));
252 ns3::RngSeedManager::SetSeed(std::rand());
253 ns3::RngSeedManager::SetRun(std::rand());
255 int v = xbt_str_parse_int(
256 val.c_str(), "Invalid value for option ns3/seed. It must be either 'time', a number, or left empty.");
257 ns3::RngSeedManager::SetSeed(v);
258 ns3::RngSeedManager::SetRun(v);
266 NetworkNS3Model::NetworkNS3Model() : NetworkModel(Model::UpdateAlgo::FULL)
268 xbt_assert(not sg_link_energy_is_inited(),
269 "LinkEnergy plugin and ns-3 network models are not compatible. Are you looking for Ecofen, maybe?");
271 all_existing_models.push_back(this);
273 NetPointNs3::EXTENSION_ID = routing::NetPoint::extension_create<NetPointNs3>();
275 ns3::Config::SetDefault("ns3::TcpSocket::SegmentSize", ns3::UintegerValue(1000));
276 ns3::Config::SetDefault("ns3::TcpSocket::DelAckCount", ns3::UintegerValue(1));
277 ns3::Config::SetDefault("ns3::TcpSocketBase::Timestamp", ns3::BooleanValue(false));
279 auto TcpProtocol = ns3_tcp_model.get();
280 if (TcpProtocol == "default") {
283 } else if (TcpProtocol == "Reno" || TcpProtocol == "NewReno" || TcpProtocol == "Tahoe") {
284 XBT_INFO("Switching Tcp protocol to '%s'", TcpProtocol.c_str());
285 ns3::Config::SetDefault("ns3::TcpL4Protocol::SocketType", ns3::StringValue("ns3::Tcp" + TcpProtocol));
288 xbt_die("The ns3/TcpModel must be: NewReno or Reno or Tahoe");
291 routing::NetPoint::on_creation.connect([](routing::NetPoint& pt) {
292 pt.extension_set<NetPointNs3>(new NetPointNs3());
293 XBT_VERB("Declare SimGrid's %s within ns-3", pt.get_cname());
296 s4u::Engine::on_platform_created.connect([]() {
297 /* Create the ns3 topology based on routing strategy */
298 ns3::GlobalRouteManager::BuildGlobalRoutingDatabase();
299 ns3::GlobalRouteManager::InitializeRoutes();
301 routing::on_cluster_creation.connect(&clusterCreation_cb);
302 s4u::NetZone::on_route_creation.connect(&routeCreation_cb);
303 s4u::NetZone::on_seal.connect(&zoneCreation_cb);
306 LinkImpl* NetworkNS3Model::create_link(const std::string& name, const std::vector<double>& bandwidths, double latency,
307 s4u::Link::SharingPolicy policy)
309 xbt_assert(bandwidths.size() == 1, "ns-3 links must use only 1 bandwidth.");
310 return new LinkNS3(this, name, bandwidths[0], latency, policy);
313 Action* NetworkNS3Model::communicate(s4u::Host* src, s4u::Host* dst, double size, double rate)
315 xbt_assert(rate == -1,
316 "Communication over ns-3 links cannot specify a specific rate. Please use -1 as a value instead of %f.",
318 return new NetworkNS3Action(this, size, src, dst);
321 double NetworkNS3Model::next_occurring_event(double now)
323 double time_to_next_flow_completion = 0.0;
324 XBT_DEBUG("ns3_next_occurring_event");
326 //get the first relevant value from the running_actions list
328 // If there is no comms in NS-3, then we do not move it forward.
329 // We will synchronize NS-3 with SimGrid when starting a new communication.
330 // (see NetworkNS3Action::NetworkNS3Action() for more details on this point)
331 if (get_started_action_set()->empty() || now == 0.0)
334 XBT_DEBUG("doing a ns3 simulation for a duration of %f", now);
336 time_to_next_flow_completion = ns3::Simulator::Now().GetSeconds() - surf_get_clock();
337 // NS-3 stops as soon as a flow ends,
338 // but it does not process the other flows that may finish at the same (simulated) time.
339 // If another flow ends at the same time, time_to_next_flow_completion = 0
340 if(double_equals(time_to_next_flow_completion, 0, sg_surf_precision))
341 time_to_next_flow_completion = 0.0;
343 XBT_DEBUG("min : %f", now);
344 XBT_DEBUG("ns3 time : %f", ns3::Simulator::Now().GetSeconds());
345 XBT_DEBUG("surf time : %f", surf_get_clock());
346 XBT_DEBUG("Next completion %f :", time_to_next_flow_completion);
348 return time_to_next_flow_completion;
351 void NetworkNS3Model::update_actions_state(double now, double delta)
353 static std::vector<std::string> socket_to_destroy;
355 std::string ns3_socket;
356 for (const auto& elm : flow_from_sock) {
357 ns3_socket = elm.first;
358 SgFlow* sgFlow = elm.second;
359 NetworkNS3Action * action = sgFlow->action_;
360 XBT_DEBUG("Processing socket %p (action %p)",sgFlow,action);
361 // Because NS3 stops as soon as a flow is finished, the other flows that ends at the same time may remains in an
362 // inconsistent state (i.e. remains_ == 0 but finished_ == false).
363 // However, SimGrid considers sometimes that an action with remains_ == 0 is finished.
364 // Thus, to avoid inconsistencies between SimGrid and NS3, set remains to 0 only when the flow is finished in NS3
365 int remains = action->get_cost() - sgFlow->sent_bytes_;
367 action->set_remains(remains);
369 if (TRACE_is_enabled() && action->get_state() == kernel::resource::Action::State::STARTED) {
370 double data_delta_sent = sgFlow->sent_bytes_ - action->last_sent_;
372 std::vector<LinkImpl*> route = std::vector<LinkImpl*>();
374 action->get_src().route_to(&action->get_dst(), route, nullptr);
375 for (auto const& link : route)
376 instr::resource_set_utilization("LINK", "bandwidth_used", link->get_cname(), action->get_category(),
377 (data_delta_sent) / delta, now - delta, delta);
379 action->last_sent_ = sgFlow->sent_bytes_;
382 if ((sgFlow->finished_) && (remains <= 0)) { // finished_ should not become true before remains gets to 0, but it sometimes does. Let's play safe, here.
383 socket_to_destroy.push_back(ns3_socket);
384 XBT_DEBUG("Destroy socket %s of action %p", ns3_socket.c_str(), action);
385 action->set_remains(0);
386 action->finish(Action::State::FINISHED);
388 XBT_DEBUG("Socket %s sent %u bytes out of %u (%u remaining)", ns3_socket.c_str(), sgFlow->sent_bytes_,
389 sgFlow->total_bytes_, sgFlow->remaining_);
393 while (not socket_to_destroy.empty()) {
394 ns3_socket = socket_to_destroy.back();
395 socket_to_destroy.pop_back();
396 SgFlow* flow = flow_from_sock.at(ns3_socket);
397 if (XBT_LOG_ISENABLED(ns3, xbt_log_priority_debug)) {
398 XBT_DEBUG("Removing socket %s of action %p", ns3_socket.c_str(), flow->action_);
401 flow_from_sock.erase(ns3_socket);
402 sink_from_sock.erase(ns3_socket);
410 LinkNS3::LinkNS3(NetworkNS3Model* model, const std::string& name, double bandwidth, double latency,
411 s4u::Link::SharingPolicy policy)
412 : LinkImpl(model, name, nullptr), sharing_policy_(policy)
414 bandwidth_.peak = bandwidth;
415 latency_.peak = latency;
417 s4u::Link::on_creation(*this->get_iface());
420 LinkNS3::~LinkNS3() = default;
422 void LinkNS3::apply_event(profile::Event*, double)
426 void LinkNS3::set_bandwidth_profile(profile::Profile*)
428 xbt_die("The ns-3 network model doesn't support bandwidth profiles");
430 void LinkNS3::set_latency_profile(profile::Profile*)
432 xbt_die("The ns-3 network model doesn't support latency profiles");
439 NetworkNS3Action::NetworkNS3Action(Model* model, double totalBytes, s4u::Host* src, s4u::Host* dst)
440 : NetworkAction(model, *src, *dst, totalBytes, false)
442 // ns-3 fails when src = dst, so avoid the problem by considering that communications are infinitely fast on the
443 // loopback that does not exists
445 static bool warned = false;
447 XBT_WARN("Sending from a host %s to itself is not supported by ns-3. Every such communication finishes "
448 "immediately upon startup.",
452 finish(Action::State::FINISHED);
456 // If there is no other started actions, we need to move NS-3 forward to be sync with SimGrid
457 if (model->get_started_action_set()->size()==1){
458 while(double_positive(surf_get_clock() - ns3::Simulator::Now().GetSeconds(), sg_surf_precision)){
459 XBT_DEBUG("Synchronizing NS-3 (time %f) with SimGrid (time %f)", ns3::Simulator::Now().GetSeconds(), surf_get_clock());
460 ns3_simulator(surf_get_clock() - ns3::Simulator::Now().GetSeconds());
464 static int port_number = 1025; // Port number is limited from 1025 to 65 000
466 ns3::Ptr<ns3::Node> src_node = src->get_netpoint()->extension<NetPointNs3>()->ns3_node_;
467 ns3::Ptr<ns3::Node> dst_node = dst->get_netpoint()->extension<NetPointNs3>()->ns3_node_;
469 std::string& addr = dst->get_netpoint()->extension<NetPointNs3>()->ipv4_address_;
470 xbt_assert(not addr.empty(), "Element %s is unknown to ns-3. Is it connected to any one-hop link?",
471 dst->get_netpoint()->get_cname());
473 ns3::PacketSinkHelper sink("ns3::TcpSocketFactory", ns3::InetSocketAddress(ns3::Ipv4Address::GetAny(), port_number));
474 ns3::ApplicationContainer apps = sink.Install(dst_node);
476 ns3::Ptr<ns3::Socket> sock = ns3::Socket::CreateSocket(src_node, ns3::TcpSocketFactory::GetTypeId());
478 XBT_DEBUG("Create socket %s for a flow of %.0f Bytes from %s to %s with Interface %s",
479 transform_socket_ptr(sock).c_str(), totalBytes, src->get_cname(), dst->get_cname(), addr.c_str());
481 flow_from_sock.insert({transform_socket_ptr(sock), new SgFlow(totalBytes, this)});
482 sink_from_sock.insert({transform_socket_ptr(sock), apps});
484 sock->Bind(ns3::InetSocketAddress(port_number));
486 ns3::Simulator::ScheduleNow(&start_flow, sock, addr.c_str(), port_number);
489 if(port_number > 65000){
491 XBT_WARN("Too many connections! Port number is saturated. Trying to use the oldest ports.");
494 s4u::Link::on_communicate(*this);
497 void NetworkNS3Action::suspend() {
501 void NetworkNS3Action::resume() {
505 std::list<LinkImpl*> NetworkNS3Action::get_links() const
509 void NetworkNS3Action::update_remains_lazy(double /*now*/)
514 } // namespace resource
515 } // namespace kernel
516 } // namespace simgrid
518 void ns3_simulator(double maxSeconds)
521 if (maxSeconds > 0.0) // If there is a maximum amount of time to run
522 id = ns3::Simulator::Schedule(ns3::Seconds(maxSeconds), &ns3::Simulator::Stop);
524 XBT_DEBUG("Start simulator for at most %fs (current time: %f)", maxSeconds, surf_get_clock());
525 ns3::Simulator::Run ();
526 XBT_DEBUG("Simulator stopped at %fs", ns3::Simulator::Now().GetSeconds());
532 void ns3_add_direct_route(simgrid::kernel::routing::NetPoint* src, simgrid::kernel::routing::NetPoint* dst, double bw,
533 double lat, const std::string& link_name, simgrid::s4u::Link::SharingPolicy policy)
535 ns3::Ipv4AddressHelper address;
536 ns3::NetDeviceContainer netA;
539 auto* host_src = src->extension<NetPointNs3>();
540 auto* host_dst = dst->extension<NetPointNs3>();
542 xbt_assert(host_src != nullptr, "Network element %s does not seem to be ns-3-ready", src->get_cname());
543 xbt_assert(host_dst != nullptr, "Network element %s does not seem to be ns-3-ready", dst->get_cname());
545 if (policy == simgrid::s4u::Link::SharingPolicy::WIFI) {
546 xbt_die("The wifi sharing policy is not supported for links. You want to use a wifi zone (see documentation).");
548 ns3::PointToPointHelper pointToPoint;
550 XBT_DEBUG("\tAdd PTP from %s to %s bw:'%f Bps' lat:'%fs'", src->get_cname(), dst->get_cname(), bw, lat);
551 pointToPoint.SetDeviceAttribute("DataRate",
552 ns3::DataRateValue(ns3::DataRate(bw * 8))); // ns-3 takes bps, but we provide Bps
553 pointToPoint.SetChannelAttribute("Delay", ns3::TimeValue(ns3::Seconds(lat)));
555 netA.Add(pointToPoint.Install(host_src->ns3_node_, host_dst->ns3_node_));
557 std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links);
558 address.SetBase(addr.c_str(), "255.255.0.0");
559 XBT_DEBUG("\tInterface stack '%s'", addr.c_str());
561 auto addresses = address.Assign(netA);
563 host_src->ipv4_address_ = transformIpv4Address(addresses.GetAddress(0));
564 host_dst->ipv4_address_ = transformIpv4Address(addresses.GetAddress(1));
566 if (number_of_links == 255) {
567 xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
569 number_of_networks++;