1 /* Copyright (c) 2007-2019. 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>
21 #include "network_ns3.hpp"
22 #include "ns3/ns3_simulator.hpp"
24 #include "simgrid/kernel/routing/NetPoint.hpp"
25 #include "simgrid/plugins/energy.h"
26 #include "simgrid/s4u/Engine.hpp"
27 #include "simgrid/s4u/NetZone.hpp"
28 #include "src/instr/instr_private.hpp" // TRACE_is_enabled(). FIXME: remove by subscribing tracing to the surf signals
29 #include "src/surf/surf_interface.hpp"
30 #include "src/surf/xml/platf_private.hpp"
31 #include "surf/surf.hpp"
33 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(ns3, surf, "Logging specific to the SURF network ns-3 module");
35 std::vector<std::string> IPV4addr;
41 extern std::map<std::string, SgFlow*> flow_from_sock;
43 static ns3::InternetStackHelper stack;
44 static ns3::NodeContainer nodes;
45 static ns3::NodeContainer Cluster_nodes;
46 static ns3::Ipv4InterfaceContainer interfaces;
48 static int number_of_nodes = 0;
49 static int number_of_clusters_nodes = 0;
50 static int number_of_links = 1;
51 static int number_of_networks = 1;
53 simgrid::xbt::Extension<simgrid::kernel::routing::NetPoint, NetPointNs3> NetPointNs3::EXTENSION_ID;
55 NetPointNs3::NetPointNs3()
57 ns3_node_ = ns3::CreateObject<ns3::Node>(0);
58 stack.Install(ns3_node_);
60 node_num = number_of_nodes++;
67 static void clusterCreation_cb(simgrid::kernel::routing::ClusterCreationArgs const& cluster)
69 for (int const& i : *cluster.radicals) {
70 // Routers don't create a router on the other end of the private link by themselves.
71 // We just need this router to be given an ID so we create a temporary NetPointNS3 so that it gets one
72 auto* host_dst = new NetPointNs3();
74 // Create private link
75 std::string host_id = cluster.prefix + std::to_string(i) + cluster.suffix;
76 auto* host_src = simgrid::s4u::Host::by_name(host_id)->pimpl_netpoint->extension<NetPointNs3>();
77 xbt_assert(host_src, "Cannot find a ns-3 host of name %s", host_id.c_str());
79 // Any ns-3 route is symmetrical
80 ns3_add_link(host_src, host_dst, cluster.bw, cluster.lat);
85 //Create link backbone
86 ns3_add_cluster(cluster.id.c_str(), cluster.bb_bw, cluster.bb_lat);
89 static void routeCreation_cb(bool symmetrical, simgrid::kernel::routing::NetPoint* src,
90 simgrid::kernel::routing::NetPoint* dst, simgrid::kernel::routing::NetPoint* gw_src,
91 simgrid::kernel::routing::NetPoint* gw_dst,
92 std::vector<simgrid::kernel::resource::LinkImpl*> const& link_list)
94 if (link_list.size() == 1) {
95 auto* link = static_cast<simgrid::kernel::resource::LinkNS3*>(link_list[0]);
97 XBT_DEBUG("Route from '%s' to '%s' with link '%s' %s", src->get_cname(), dst->get_cname(), link->get_cname(),
98 (symmetrical ? "(symmetrical)" : "(not symmetrical)"));
100 // XBT_DEBUG("src (%s), dst (%s), src_id = %d, dst_id = %d",src,dst, src_id, dst_id);
101 XBT_DEBUG("\tLink (%s) bw:%fbps lat:%fs", link->get_cname(), link->get_bandwidth(), link->get_latency());
104 auto* host_src = src->extension<NetPointNs3>();
105 auto* host_dst = dst->extension<NetPointNs3>();
107 xbt_assert(host_src != nullptr, "Network element %s does not seem to be ns-3-ready", src->get_cname());
108 xbt_assert(host_dst != nullptr, "Network element %s does not seem to be ns-3-ready", dst->get_cname());
110 ns3_add_link(host_src, host_dst, link->get_bandwidth(), link->get_latency());
112 static bool warned_about_long_routes = false;
114 if (not warned_about_long_routes)
115 XBT_WARN("Ignoring a route between %s and %s of length %zu: Only routes of length 1 are considered with ns-3.\n"
116 "WARNING: You can ignore this warning if your hosts can still communicate when only considering routes "
118 "WARNING: Remove long routes to avoid this harmless message; subsequent long routes will be silently "
120 src->get_cname(), dst->get_cname(), link_list.size());
121 warned_about_long_routes = true;
125 /* Create the ns3 topology based on routing strategy */
126 static void postparse_cb()
128 IPV4addr.shrink_to_fit();
130 ns3::GlobalRouteManager::BuildGlobalRoutingDatabase();
131 ns3::GlobalRouteManager::InitializeRoutes();
137 void surf_network_model_init_NS3()
139 xbt_assert(surf_network_model == nullptr, "Cannot set the network model twice");
141 surf_network_model = new simgrid::kernel::resource::NetworkNS3Model();
144 static simgrid::config::Flag<std::string>
145 ns3_tcp_model("ns3/TcpModel", "The ns-3 tcp model can be : NewReno or Reno or Tahoe", "default");
151 NetworkNS3Model::NetworkNS3Model() : NetworkModel(Model::UpdateAlgo::FULL)
153 xbt_assert(not sg_link_energy_is_inited(),
154 "LinkEnergy plugin and ns-3 network models are not compatible. Are you looking for Ecofen, maybe?");
156 all_existing_models.push_back(this);
158 NetPointNs3::EXTENSION_ID = routing::NetPoint::extension_create<NetPointNs3>();
160 ns3_initialize(ns3_tcp_model.get());
162 routing::NetPoint::on_creation.connect([](routing::NetPoint& pt) {
163 pt.extension_set<NetPointNs3>(new NetPointNs3());
164 XBT_VERB("SimGrid's %s is known as node %d within ns-3", pt.get_cname(), pt.extension<NetPointNs3>()->node_num);
166 surf::on_cluster.connect(&clusterCreation_cb);
168 s4u::on_platform_created.connect(&postparse_cb);
169 s4u::NetZone::on_route_creation.connect(&routeCreation_cb);
172 NetworkNS3Model::~NetworkNS3Model() {
176 LinkImpl* NetworkNS3Model::create_link(const std::string& name, const std::vector<double>& bandwidths, double latency,
177 s4u::Link::SharingPolicy)
179 xbt_assert(bandwidths.size() == 1, "ns-3 links must use only 1 bandwidth.");
180 return new LinkNS3(this, name, bandwidths[0], latency);
183 Action* NetworkNS3Model::communicate(s4u::Host* src, s4u::Host* dst, double size, double rate)
185 xbt_assert(rate == -1,
186 "Communication over ns-3 links cannot specify a specific rate. Please use -1 as a value instead of %f.",
188 return new NetworkNS3Action(this, size, src, dst);
191 double NetworkNS3Model::next_occuring_event(double now)
193 double time_to_next_flow_completion = 0.0;
194 XBT_DEBUG("ns3_next_occuring_event");
196 //get the first relevant value from the running_actions list
197 if (get_started_action_set()->empty() || now == 0.0)
200 XBT_DEBUG("doing a ns3 simulation for a duration of %f", now);
202 time_to_next_flow_completion = ns3::Simulator::Now().GetSeconds() - surf_get_clock();
203 // NS-3 stops as soon as a flow ends,
204 // but it does not process the other flows that may finish at the same (simulated) time.
205 // If another flow ends at the same time, time_to_next_flow_completion = 0
206 if(double_equals(time_to_next_flow_completion, 0, sg_surf_precision))
207 time_to_next_flow_completion = 0.0;
209 XBT_DEBUG("min : %f", now);
210 XBT_DEBUG("ns3 time : %f", ns3::Simulator::Now().GetSeconds());
211 XBT_DEBUG("surf time : %f", surf_get_clock());
212 XBT_DEBUG("Next completion %f :", time_to_next_flow_completion);
214 return time_to_next_flow_completion;
217 void NetworkNS3Model::update_actions_state(double now, double delta)
219 static std::vector<std::string> socket_to_destroy;
221 /* If there are no running flows, advance the ns-3 simulator and return */
222 if (get_started_action_set()->empty()) {
224 while(double_positive(now - ns3::Simulator::Now().GetSeconds(), sg_surf_precision))
225 ns3_simulator(now-ns3::Simulator::Now().GetSeconds());
230 std::string ns3_socket;
231 for (const auto& elm : flow_from_sock) {
232 ns3_socket = elm.first;
233 SgFlow* sgFlow = elm.second;
234 NetworkNS3Action * action = sgFlow->action_;
235 XBT_DEBUG("Processing socket %p (action %p)",sgFlow,action);
236 // Because NS3 stops as soon as a flow is finished, the other flows that ends at the same time may remains in an inconsistant state
237 // (i.e. remains_ == 0 but finished_ == false).
238 // However, SimGrid considers sometimes that an action with remains_ == 0 is finished.
239 // Thus, to avoid inconsistencies between SimGrid and NS3, set remains to 0 only when the flow is finished in NS3
240 int remains = action->get_cost() - sgFlow->sent_bytes_;
242 action->set_remains(remains);
244 if (TRACE_is_enabled() && action->get_state() == kernel::resource::Action::State::STARTED) {
245 double data_delta_sent = sgFlow->sent_bytes_ - action->last_sent_;
247 std::vector<LinkImpl*> route = std::vector<LinkImpl*>();
249 action->src_->route_to(action->dst_, route, nullptr);
250 for (auto const& link : route)
251 TRACE_surf_resource_set_utilization("LINK", "bandwidth_used", link->get_cname(), action->get_category(),
252 (data_delta_sent) / delta, now - delta, delta);
254 action->last_sent_ = sgFlow->sent_bytes_;
257 if(sgFlow->finished_){
258 socket_to_destroy.push_back(ns3_socket);
259 XBT_DEBUG("Destroy socket %p of action %p", ns3_socket.c_str(), action);
260 action->set_remains(0);
261 action->finish(kernel::resource::Action::State::FINISHED);
263 XBT_DEBUG("Socket %p sent %u bytes out of %u (%u remaining)", ns3_socket.c_str(), sgFlow->sent_bytes_,
264 sgFlow->total_bytes_, sgFlow->remaining_);
268 while (not socket_to_destroy.empty()) {
269 ns3_socket = socket_to_destroy.back();
270 socket_to_destroy.pop_back();
271 SgFlow* flow = flow_from_sock.at(ns3_socket);
272 if (XBT_LOG_ISENABLED(ns3, xbt_log_priority_debug)) {
273 XBT_DEBUG("Removing socket %p of action %p", ns3_socket.c_str(), flow->action_);
276 flow_from_sock.erase(ns3_socket);
284 LinkNS3::LinkNS3(NetworkNS3Model* model, const std::string& name, double bandwidth, double latency)
285 : LinkImpl(model, name, nullptr)
287 bandwidth_.peak = bandwidth;
288 latency_.peak = latency;
290 s4u::Link::on_creation(this->piface_);
293 LinkNS3::~LinkNS3() = default;
295 void LinkNS3::apply_event(profile::Event*, double)
299 void LinkNS3::set_bandwidth_profile(profile::Profile*)
301 xbt_die("The ns-3 network model doesn't support bandwidth profiles");
303 void LinkNS3::set_latency_profile(profile::Profile*)
305 xbt_die("The ns-3 network model doesn't support latency profiles");
312 NetworkNS3Action::NetworkNS3Action(Model* model, double totalBytes, s4u::Host* src, s4u::Host* dst)
313 : NetworkAction(model, totalBytes, false), src_(src), dst_(dst)
315 XBT_DEBUG("Communicate from %s to %s", src->get_cname(), dst->get_cname());
317 static int port_number = 1025; // Port number is limited from 1025 to 65 000
319 unsigned int node1 = src->pimpl_netpoint->extension<NetPointNs3>()->node_num;
320 unsigned int node2 = dst->pimpl_netpoint->extension<NetPointNs3>()->node_num;
322 ns3::Ptr<ns3::Node> src_node = src->pimpl_netpoint->extension<NetPointNs3>()->ns3_node_;
323 ns3::Ptr<ns3::Node> dst_node = dst->pimpl_netpoint->extension<NetPointNs3>()->ns3_node_;
325 xbt_assert(node2 < IPV4addr.size(), "Element %s is unknown to ns-3. Is it connected to any one-hop link?",
326 dst->pimpl_netpoint->get_cname());
327 std::string& addr = IPV4addr[node2];
328 xbt_assert(not addr.empty(), "Element %s is unknown to ns-3. Is it connected to any one-hop link?",
329 dst->pimpl_netpoint->get_cname());
331 XBT_DEBUG("ns3: Create flow of %.0f Bytes from %u to %u with Interface %s", totalBytes, node1, node2, addr.c_str());
332 ns3::PacketSinkHelper sink("ns3::TcpSocketFactory", ns3::InetSocketAddress(ns3::Ipv4Address::GetAny(), port_number));
333 sink.Install(dst_node);
335 ns3::Ptr<ns3::Socket> sock = ns3::Socket::CreateSocket(src_node, ns3::TcpSocketFactory::GetTypeId());
337 flow_from_sock.insert({transform_socket_ptr(sock), new SgFlow(totalBytes, this)});
339 sock->Bind(ns3::InetSocketAddress(port_number));
341 ns3::Simulator::ScheduleNow(&start_flow, sock, addr.c_str(), port_number);
344 xbt_assert(port_number <= 65000, "Too many connections! Port number is saturated.");
346 s4u::Link::on_communicate(*this, src, dst);
349 void NetworkNS3Action::suspend() {
353 void NetworkNS3Action::resume() {
357 std::list<LinkImpl*> NetworkNS3Action::links() const
361 void NetworkNS3Action::update_remains_lazy(double /*now*/)
366 } // namespace resource
367 } // namespace kernel
368 } // namespace simgrid
370 void ns3_simulator(double maxSeconds)
372 if (maxSeconds > 0.0) // If there is a maximum amount of time to run
373 ns3::Simulator::Stop(ns3::Seconds(maxSeconds));
374 XBT_DEBUG("Start simulator for at most %fs (current time: %f)", maxSeconds, surf_get_clock());
375 ns3::Simulator::Run ();
378 // initialize the ns-3 interface and environment
379 void ns3_initialize(std::string TcpProtocol)
386 ns3::Config::SetDefault ("ns3::TcpSocket::SegmentSize", ns3::UintegerValue (1000));
387 ns3::Config::SetDefault ("ns3::TcpSocket::DelAckCount", ns3::UintegerValue (1));
388 ns3::Config::SetDefault ("ns3::TcpSocketBase::Timestamp", ns3::BooleanValue (false));
390 if (TcpProtocol == "default") {
393 } else if (TcpProtocol == "Reno") {
394 XBT_INFO("Switching Tcp protocol to '%s'", TcpProtocol.c_str());
395 ns3::Config::SetDefault ("ns3::TcpL4Protocol::SocketType", ns3::StringValue("ns3::TcpReno"));
397 } else if (TcpProtocol == "NewReno") {
398 XBT_INFO("Switching Tcp protocol to '%s'", TcpProtocol.c_str());
399 ns3::Config::SetDefault ("ns3::TcpL4Protocol::SocketType", ns3::StringValue("ns3::TcpNewReno"));
401 } else if (TcpProtocol == "Tahoe") {
402 XBT_INFO("Switching Tcp protocol to '%s'", TcpProtocol.c_str());
403 ns3::Config::SetDefault ("ns3::TcpL4Protocol::SocketType", ns3::StringValue("ns3::TcpTahoe"));
406 xbt_die("The ns3/TcpModel must be: NewReno or Reno or Tahoe");
410 void ns3_add_cluster(const char* id, double bw, double lat) {
411 ns3::NodeContainer Nodes;
413 for (unsigned int i = number_of_clusters_nodes; i < Cluster_nodes.GetN(); i++) {
414 Nodes.Add(Cluster_nodes.Get(i));
415 XBT_DEBUG("Add node %u to cluster", i);
417 number_of_clusters_nodes = Cluster_nodes.GetN();
419 XBT_DEBUG("Add router %u to cluster", nodes.GetN() - Nodes.GetN() - 1);
420 Nodes.Add(nodes.Get(nodes.GetN()-Nodes.GetN()-1));
422 xbt_assert(Nodes.GetN() <= 65000, "Cluster with ns-3 is limited to 65000 nodes");
423 ns3::CsmaHelper csma;
424 csma.SetChannelAttribute("DataRate", ns3::DataRateValue(ns3::DataRate(bw * 8))); // ns-3 takes bps, but we provide Bps
425 csma.SetChannelAttribute("Delay", ns3::TimeValue(ns3::Seconds(lat)));
426 ns3::NetDeviceContainer devices = csma.Install(Nodes);
427 XBT_DEBUG("Create CSMA");
429 std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links);
430 XBT_DEBUG("Assign IP Addresses %s to CSMA.", addr.c_str());
431 ns3::Ipv4AddressHelper ipv4;
432 ipv4.SetBase(addr.c_str(), "255.255.0.0");
433 interfaces.Add(ipv4.Assign (devices));
435 if(number_of_links == 255){
436 xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
438 number_of_networks++;
442 XBT_DEBUG("Number of nodes in Cluster_nodes: %u", Cluster_nodes.GetN());
445 static std::string transformIpv4Address(ns3::Ipv4Address from)
447 std::stringstream sstream;
449 return sstream.str();
452 void ns3_add_link(NetPointNs3* src, NetPointNs3* dst, double bw, double lat) {
453 ns3::PointToPointHelper pointToPoint;
455 ns3::Ipv4AddressHelper address;
457 int srcNum = src->node_num;
458 int dstNum = dst->node_num;
460 ns3::Ptr<ns3::Node> a = src->ns3_node_;
461 ns3::Ptr<ns3::Node> b = dst->ns3_node_;
463 XBT_DEBUG("\tAdd PTP from %d to %d bw:'%f Bps' lat:'%fs'", srcNum, dstNum, bw, lat);
464 pointToPoint.SetDeviceAttribute("DataRate",
465 ns3::DataRateValue(ns3::DataRate(bw * 8))); // ns-3 takes bps, but we provide Bps
466 pointToPoint.SetChannelAttribute("Delay", ns3::TimeValue(ns3::Seconds(lat)));
468 ns3::NetDeviceContainer netA;
469 netA.Add(pointToPoint.Install (a, b));
471 std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links);
472 address.SetBase(addr.c_str(), "255.255.0.0");
473 XBT_DEBUG("\tInterface stack '%s'", addr.c_str());
474 interfaces.Add(address.Assign (netA));
476 if (IPV4addr.size() <= (unsigned)srcNum)
477 IPV4addr.resize(srcNum + 1);
478 IPV4addr[srcNum] = transformIpv4Address(interfaces.GetAddress(interfaces.GetN() - 2));
480 if (IPV4addr.size() <= (unsigned)dstNum)
481 IPV4addr.resize(dstNum + 1);
482 IPV4addr[dstNum] = transformIpv4Address(interfaces.GetAddress(interfaces.GetN() - 1));
484 if (number_of_links == 255){
485 xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
487 number_of_networks++;