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"
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>
20 #include <ns3/application-container.h>
21 #include <ns3/event-id.h>
23 #include "network_ns3.hpp"
24 #include "ns3/ns3_simulator.hpp"
26 #include "simgrid/kernel/routing/NetPoint.hpp"
27 #include "simgrid/plugins/energy.h"
28 #include "simgrid/s4u/Engine.hpp"
29 #include "simgrid/s4u/NetZone.hpp"
30 #include "src/instr/instr_private.hpp" // TRACE_is_enabled(). FIXME: remove by subscribing tracing to the surf signals
31 #include "src/surf/surf_interface.hpp"
32 #include "src/surf/xml/platf_private.hpp"
33 #include "surf/surf.hpp"
35 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(ns3, surf, "Logging specific to the SURF network ns-3 module");
41 extern std::map<std::string, SgFlow*> flow_from_sock;
42 extern std::map<std::string, ns3::ApplicationContainer> sink_from_sock;
44 static ns3::InternetStackHelper stack;
46 static int number_of_nodes = 0;
47 static int number_of_links = 1;
48 static int number_of_networks = 1;
50 simgrid::xbt::Extension<simgrid::kernel::routing::NetPoint, NetPointNs3> NetPointNs3::EXTENSION_ID;
52 NetPointNs3::NetPointNs3() : ns3_node_(ns3::CreateObject<ns3::Node>(0))
54 stack.Install(ns3_node_);
55 node_num = number_of_nodes++;
62 static void clusterCreation_cb(simgrid::kernel::routing::ClusterCreationArgs const& cluster)
64 ns3::NodeContainer Nodes;
66 for (int const& i : *cluster.radicals) {
67 // Routers don't create a router on the other end of the private link by themselves.
68 // We just need this router to be given an ID so we create a temporary NetPointNS3 so that it gets one
69 auto* host_dst = new NetPointNs3();
71 // Create private link
72 std::string host_id = cluster.prefix + std::to_string(i) + cluster.suffix;
73 auto* host_src = simgrid::s4u::Host::by_name(host_id)->get_netpoint()->extension<NetPointNs3>();
74 xbt_assert(host_src, "Cannot find a ns-3 host of name %s", host_id.c_str());
76 // Any ns-3 route is symmetrical
77 ns3_add_direct_route(host_src, host_dst, cluster.bw, cluster.lat, cluster.sharing_policy);
81 // Also add the host to the list of hosts that will be connected to the backbone
82 Nodes.Add(host_src->ns3_node_);
85 // Create link backbone
87 xbt_assert(Nodes.GetN() <= 65000, "Cluster with ns-3 is limited to 65000 nodes");
89 csma.SetChannelAttribute("DataRate",
90 ns3::DataRateValue(ns3::DataRate(cluster.bb_bw * 8))); // ns-3 takes bps, but we provide Bps
91 csma.SetChannelAttribute("Delay", ns3::TimeValue(ns3::Seconds(cluster.bb_lat)));
92 ns3::NetDeviceContainer devices = csma.Install(Nodes);
93 XBT_DEBUG("Create CSMA");
95 std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links);
96 XBT_DEBUG("Assign IP Addresses %s to CSMA.", addr.c_str());
97 ns3::Ipv4AddressHelper ipv4;
98 ipv4.SetBase(addr.c_str(), "255.255.0.0");
101 if (number_of_links == 255) {
102 xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
104 number_of_networks++;
110 static void routeCreation_cb(bool symmetrical, simgrid::kernel::routing::NetPoint* src,
111 simgrid::kernel::routing::NetPoint* dst, simgrid::kernel::routing::NetPoint* /*gw_src*/,
112 simgrid::kernel::routing::NetPoint* /*gw_dst*/,
113 std::vector<simgrid::kernel::resource::LinkImpl*> const& link_list)
115 if (link_list.size() == 1) {
116 auto* link = static_cast<simgrid::kernel::resource::LinkNS3*>(link_list[0]);
118 XBT_DEBUG("Route from '%s' to '%s' with link '%s' %s %s", src->get_cname(), dst->get_cname(), link->get_cname(),
119 (link->get_sharing_policy() == simgrid::s4u::Link::SharingPolicy::WIFI ? "(wifi)" : "(wired)"),
120 (symmetrical ? "(symmetrical)" : "(not symmetrical)"));
122 // XBT_DEBUG("src (%s), dst (%s), src_id = %d, dst_id = %d",src,dst, src_id, dst_id);
123 XBT_DEBUG("\tLink (%s) bw:%fbps lat:%fs", link->get_cname(), link->get_bandwidth(), link->get_latency());
126 auto* host_src = src->extension<NetPointNs3>();
127 auto* host_dst = dst->extension<NetPointNs3>();
129 xbt_assert(host_src != nullptr, "Network element %s does not seem to be ns-3-ready", src->get_cname());
130 xbt_assert(host_dst != nullptr, "Network element %s does not seem to be ns-3-ready", dst->get_cname());
132 ns3_add_direct_route(host_src, host_dst, link->get_bandwidth(), link->get_latency(), link->get_sharing_policy());
134 static bool warned_about_long_routes = false;
136 if (not warned_about_long_routes)
137 XBT_WARN("Ignoring a route between %s and %s of length %zu: Only routes of length 1 are considered with ns-3.\n"
138 "WARNING: You can ignore this warning if your hosts can still communicate when only considering routes "
140 "WARNING: Remove long routes to avoid this harmless message; subsequent long routes will be silently "
142 src->get_cname(), dst->get_cname(), link_list.size());
143 warned_about_long_routes = true;
147 /* Create the ns3 topology based on routing strategy */
148 static void postparse_cb()
150 ns3::GlobalRouteManager::BuildGlobalRoutingDatabase();
151 ns3::GlobalRouteManager::InitializeRoutes();
157 void surf_network_model_init_NS3()
159 xbt_assert(surf_network_model == nullptr, "Cannot set the network model twice");
161 surf_network_model = new simgrid::kernel::resource::NetworkNS3Model();
164 static simgrid::config::Flag<std::string>
165 ns3_tcp_model("ns3/TcpModel", "The ns-3 tcp model can be : NewReno or Reno or Tahoe", "default");
171 NetworkNS3Model::NetworkNS3Model() : NetworkModel(Model::UpdateAlgo::FULL)
173 xbt_assert(not sg_link_energy_is_inited(),
174 "LinkEnergy plugin and ns-3 network models are not compatible. Are you looking for Ecofen, maybe?");
176 all_existing_models.push_back(this);
178 NetPointNs3::EXTENSION_ID = routing::NetPoint::extension_create<NetPointNs3>();
180 ns3_initialize(ns3_tcp_model.get());
182 routing::NetPoint::on_creation.connect([](routing::NetPoint& pt) {
183 pt.extension_set<NetPointNs3>(new NetPointNs3());
184 XBT_VERB("SimGrid's %s is known as node %d within ns-3", pt.get_cname(), pt.extension<NetPointNs3>()->node_num);
186 routing::on_cluster_creation.connect(&clusterCreation_cb);
188 s4u::Engine::on_platform_created.connect(&postparse_cb);
189 s4u::NetZone::on_route_creation.connect(&routeCreation_cb);
192 LinkImpl* NetworkNS3Model::create_link(const std::string& name, const std::vector<double>& bandwidths, double latency,
193 s4u::Link::SharingPolicy policy)
195 xbt_assert(bandwidths.size() == 1, "ns-3 links must use only 1 bandwidth.");
196 return new LinkNS3(this, name, bandwidths[0], latency, policy);
199 Action* NetworkNS3Model::communicate(s4u::Host* src, s4u::Host* dst, double size, double rate)
201 xbt_assert(rate == -1,
202 "Communication over ns-3 links cannot specify a specific rate. Please use -1 as a value instead of %f.",
204 return new NetworkNS3Action(this, size, src, dst);
207 double NetworkNS3Model::next_occurring_event(double now)
209 double time_to_next_flow_completion = 0.0;
210 XBT_DEBUG("ns3_next_occurring_event");
212 //get the first relevant value from the running_actions list
214 // If there is no comms in NS-3, then we do not move it forward.
215 // We will synchronize NS-3 with SimGrid when starting a new communication.
216 // (see NetworkNS3Action::NetworkNS3Action() for more details on this point)
217 if (get_started_action_set()->empty() || now == 0.0)
220 XBT_DEBUG("doing a ns3 simulation for a duration of %f", now);
222 time_to_next_flow_completion = ns3::Simulator::Now().GetSeconds() - surf_get_clock();
223 // NS-3 stops as soon as a flow ends,
224 // but it does not process the other flows that may finish at the same (simulated) time.
225 // If another flow ends at the same time, time_to_next_flow_completion = 0
226 if(double_equals(time_to_next_flow_completion, 0, sg_surf_precision))
227 time_to_next_flow_completion = 0.0;
229 XBT_DEBUG("min : %f", now);
230 XBT_DEBUG("ns3 time : %f", ns3::Simulator::Now().GetSeconds());
231 XBT_DEBUG("surf time : %f", surf_get_clock());
232 XBT_DEBUG("Next completion %f :", time_to_next_flow_completion);
234 return time_to_next_flow_completion;
237 void NetworkNS3Model::update_actions_state(double now, double delta)
239 static std::vector<std::string> socket_to_destroy;
241 std::string ns3_socket;
242 for (const auto& elm : flow_from_sock) {
243 ns3_socket = elm.first;
244 SgFlow* sgFlow = elm.second;
245 NetworkNS3Action * action = sgFlow->action_;
246 XBT_DEBUG("Processing socket %p (action %p)",sgFlow,action);
247 // Because NS3 stops as soon as a flow is finished, the other flows that ends at the same time may remains in an
248 // inconsistent state (i.e. remains_ == 0 but finished_ == false).
249 // However, SimGrid considers sometimes that an action with remains_ == 0 is finished.
250 // Thus, to avoid inconsistencies between SimGrid and NS3, set remains to 0 only when the flow is finished in NS3
251 int remains = action->get_cost() - sgFlow->sent_bytes_;
253 action->set_remains(remains);
255 if (TRACE_is_enabled() && action->get_state() == kernel::resource::Action::State::STARTED) {
256 double data_delta_sent = sgFlow->sent_bytes_ - action->last_sent_;
258 std::vector<LinkImpl*> route = std::vector<LinkImpl*>();
260 action->get_src().route_to(&action->get_dst(), route, nullptr);
261 for (auto const& link : route)
262 instr::resource_set_utilization("LINK", "bandwidth_used", link->get_cname(), action->get_category(),
263 (data_delta_sent) / delta, now - delta, delta);
265 action->last_sent_ = sgFlow->sent_bytes_;
268 if(sgFlow->finished_){
269 socket_to_destroy.push_back(ns3_socket);
270 XBT_DEBUG("Destroy socket %p of action %p", ns3_socket.c_str(), action);
271 action->set_remains(0);
272 action->finish(Action::State::FINISHED);
274 XBT_DEBUG("Socket %p sent %u bytes out of %u (%u remaining)", ns3_socket.c_str(), sgFlow->sent_bytes_,
275 sgFlow->total_bytes_, sgFlow->remaining_);
279 while (not socket_to_destroy.empty()) {
280 ns3_socket = socket_to_destroy.back();
281 socket_to_destroy.pop_back();
282 SgFlow* flow = flow_from_sock.at(ns3_socket);
283 if (XBT_LOG_ISENABLED(ns3, xbt_log_priority_debug)) {
284 XBT_DEBUG("Removing socket %p of action %p", ns3_socket.c_str(), flow->action_);
287 flow_from_sock.erase(ns3_socket);
288 sink_from_sock.erase(ns3_socket);
296 LinkNS3::LinkNS3(NetworkNS3Model* model, const std::string& name, double bandwidth, double latency,
297 s4u::Link::SharingPolicy policy)
298 : LinkImpl(model, name, nullptr), sharing_policy_(policy)
300 bandwidth_.peak = bandwidth;
301 latency_.peak = latency;
303 /* If wifi, create the wifizone now. If not, don't do anything: the links will be created in routeCreate_cb */
305 s4u::Link::on_creation(*this->get_iface());
308 LinkNS3::~LinkNS3() = default;
310 void LinkNS3::apply_event(profile::Event*, double)
314 void LinkNS3::set_bandwidth_profile(profile::Profile*)
316 xbt_die("The ns-3 network model doesn't support bandwidth profiles");
318 void LinkNS3::set_latency_profile(profile::Profile*)
320 xbt_die("The ns-3 network model doesn't support latency profiles");
327 NetworkNS3Action::NetworkNS3Action(Model* model, double totalBytes, s4u::Host* src, s4u::Host* dst)
328 : NetworkAction(model, *src, *dst, totalBytes, false)
330 // If there is no other started actions, we need to move NS-3 forward to be sync with SimGrid
331 if (model->get_started_action_set()->size()==1){
332 while(double_positive(surf_get_clock() - ns3::Simulator::Now().GetSeconds(), sg_surf_precision)){
333 XBT_DEBUG("Synchronizing NS-3 (time %f) with SimGrid (time %f)", ns3::Simulator::Now().GetSeconds(), surf_get_clock());
334 ns3_simulator(surf_get_clock() - ns3::Simulator::Now().GetSeconds());
338 XBT_DEBUG("Communicate from %s to %s", src->get_cname(), dst->get_cname());
340 static int port_number = 1025; // Port number is limited from 1025 to 65 000
342 unsigned int node1 = src->get_netpoint()->extension<NetPointNs3>()->node_num;
343 unsigned int node2 = dst->get_netpoint()->extension<NetPointNs3>()->node_num;
345 ns3::Ptr<ns3::Node> src_node = src->get_netpoint()->extension<NetPointNs3>()->ns3_node_;
346 ns3::Ptr<ns3::Node> dst_node = dst->get_netpoint()->extension<NetPointNs3>()->ns3_node_;
348 std::string& addr = dst->get_netpoint()->extension<NetPointNs3>()->ipv4_address_;
349 xbt_assert(not addr.empty(), "Element %s is unknown to ns-3. Is it connected to any one-hop link?",
350 dst->get_netpoint()->get_cname());
352 XBT_DEBUG("ns3: Create flow of %.0f Bytes from %u to %u with Interface %s", totalBytes, node1, node2, addr.c_str());
353 ns3::PacketSinkHelper sink("ns3::TcpSocketFactory", ns3::InetSocketAddress(ns3::Ipv4Address::GetAny(), port_number));
354 ns3::ApplicationContainer apps = sink.Install(dst_node);
356 ns3::Ptr<ns3::Socket> sock = ns3::Socket::CreateSocket(src_node, ns3::TcpSocketFactory::GetTypeId());
358 flow_from_sock.insert({transform_socket_ptr(sock), new SgFlow(totalBytes, this)});
359 sink_from_sock.insert({transform_socket_ptr(sock), apps});
361 sock->Bind(ns3::InetSocketAddress(port_number));
363 ns3::Simulator::ScheduleNow(&start_flow, sock, addr.c_str(), port_number);
366 if(port_number > 65000){
368 XBT_WARN("Too many connections! Port number is saturated. Trying to use the oldest ports.");
371 s4u::Link::on_communicate(*this);
374 void NetworkNS3Action::suspend() {
378 void NetworkNS3Action::resume() {
382 std::list<LinkImpl*> NetworkNS3Action::get_links() const
386 void NetworkNS3Action::update_remains_lazy(double /*now*/)
391 } // namespace resource
392 } // namespace kernel
393 } // namespace simgrid
395 void ns3_simulator(double maxSeconds)
398 if (maxSeconds > 0.0) // If there is a maximum amount of time to run
399 id = ns3::Simulator::Schedule(ns3::Seconds(maxSeconds), &ns3::Simulator::Stop);
401 XBT_DEBUG("Start simulator for at most %fs (current time: %f)", maxSeconds, surf_get_clock());
402 ns3::Simulator::Run ();
403 XBT_DEBUG("Simulator stopped at %fs", ns3::Simulator::Now().GetSeconds());
409 // initialize the ns-3 interface and environment
410 void ns3_initialize(std::string TcpProtocol)
417 ns3::Config::SetDefault ("ns3::TcpSocket::SegmentSize", ns3::UintegerValue (1000));
418 ns3::Config::SetDefault ("ns3::TcpSocket::DelAckCount", ns3::UintegerValue (1));
419 ns3::Config::SetDefault ("ns3::TcpSocketBase::Timestamp", ns3::BooleanValue (false));
421 if (TcpProtocol == "default") {
424 } else if (TcpProtocol == "Reno") {
425 XBT_INFO("Switching Tcp protocol to '%s'", TcpProtocol.c_str());
426 ns3::Config::SetDefault ("ns3::TcpL4Protocol::SocketType", ns3::StringValue("ns3::TcpReno"));
428 } else if (TcpProtocol == "NewReno") {
429 XBT_INFO("Switching Tcp protocol to '%s'", TcpProtocol.c_str());
430 ns3::Config::SetDefault ("ns3::TcpL4Protocol::SocketType", ns3::StringValue("ns3::TcpNewReno"));
432 } else if (TcpProtocol == "Tahoe") {
433 XBT_INFO("Switching Tcp protocol to '%s'", TcpProtocol.c_str());
434 ns3::Config::SetDefault ("ns3::TcpL4Protocol::SocketType", ns3::StringValue("ns3::TcpTahoe"));
437 xbt_die("The ns3/TcpModel must be: NewReno or Reno or Tahoe");
441 static std::string transformIpv4Address(ns3::Ipv4Address from)
443 std::stringstream sstream;
445 return sstream.str();
448 void ns3_add_direct_route(NetPointNs3* src, NetPointNs3* dst, double bw, double lat,
449 simgrid::s4u::Link::SharingPolicy policy)
451 ns3::Ipv4AddressHelper address;
452 ns3::NetDeviceContainer netA;
454 int srcNum = src->node_num;
455 int dstNum = dst->node_num;
457 ns3::Ptr<ns3::Node> a = src->ns3_node_;
458 ns3::Ptr<ns3::Node> b = dst->ns3_node_;
460 if (policy == simgrid::s4u::Link::SharingPolicy::WIFI) {
461 /* Install a ns3::WifiHelper */
463 ns3::PointToPointHelper pointToPoint;
465 XBT_DEBUG("\tAdd PTP from %d to %d bw:'%f Bps' lat:'%fs'", srcNum, dstNum, bw, lat);
466 pointToPoint.SetDeviceAttribute("DataRate",
467 ns3::DataRateValue(ns3::DataRate(bw * 8))); // ns-3 takes bps, but we provide Bps
468 pointToPoint.SetChannelAttribute("Delay", ns3::TimeValue(ns3::Seconds(lat)));
470 netA.Add(pointToPoint.Install(a, b));
473 std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links);
474 address.SetBase(addr.c_str(), "255.255.0.0");
475 XBT_DEBUG("\tInterface stack '%s'", addr.c_str());
476 auto addresses = address.Assign(netA);
478 src->ipv4_address_ = transformIpv4Address(addresses.GetAddress(0));
479 dst->ipv4_address_ = transformIpv4Address(addresses.GetAddress(1));
481 if (number_of_links == 255){
482 xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
484 number_of_networks++;