1 /* Copyright (c) 2007-2023. 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. */
6 #include "src/kernel/resource/models/ns3/ns3_simulator.hpp"
9 #include "xbt/sysdep.h"
11 #include <ns3/application-container.h>
12 #include <ns3/callback.h>
13 #include <ns3/ipv4-address-helper.h>
14 #include <ns3/packet-sink.h>
15 #include <ns3/point-to-point-helper.h>
20 std::map<std::string, SgFlow*, std::less<>> flow_from_sock; // ns3::sock -> SgFlow
21 std::map<std::string, ns3::ApplicationContainer, std::less<>> sink_from_sock; // ns3::sock -> ns3::PacketSink
23 static void receive_callback(ns3::Ptr<ns3::Socket> socket);
24 static void datasent_cb(ns3::Ptr<ns3::Socket> socket, uint32_t dataSent);
26 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(res_ns3);
28 SgFlow::SgFlow(uint32_t totalBytes, simgrid::kernel::resource::NetworkNS3Action* action)
29 : total_bytes_(totalBytes), remaining_(totalBytes), action_(action)
33 static SgFlow* getFlowFromSocket(ns3::Ptr<ns3::Socket> socket)
35 auto it = flow_from_sock.find(transform_socket_ptr(socket));
36 return (it == flow_from_sock.end()) ? nullptr : it->second;
39 static ns3::ApplicationContainer* getSinkFromSocket(ns3::Ptr<ns3::Socket> socket)
41 auto it = sink_from_sock.find(transform_socket_ptr(socket));
42 return (it == sink_from_sock.end()) ? nullptr : &(it->second);
45 static void receive_callback(ns3::Ptr<ns3::Socket> socket)
47 SgFlow* flow = getFlowFromSocket(socket);
48 XBT_DEBUG("received on F[%p, total: %u, remain: %u]", flow, flow->total_bytes_, flow->remaining_);
50 if (not flow->finished_) {
51 flow->finished_ = true;
52 XBT_DEBUG("recv_cb of F[%p, %p, %u]", flow, flow->action_, flow->total_bytes_);
53 XBT_DEBUG("Stop simulator at %f seconds", ns3::Simulator::Now().GetSeconds());
54 ns3::Simulator::Stop();
58 static void send_cb(ns3::Ptr<ns3::Socket> sock, uint32_t /*txSpace*/)
60 SgFlow* flow = getFlowFromSocket(sock);
61 const ns3::ApplicationContainer* sink = getSinkFromSocket(sock);
62 XBT_DEBUG("Asked to write on F[%p, total: %u, remain: %u]", flow, flow->total_bytes_, flow->remaining_);
64 if (flow->remaining_ == 0) // all data was already buffered (and socket was already closed)
67 /* While not all is buffered and there remain space in the buffers */
68 while (flow->buffered_bytes_ < flow->total_bytes_ && sock->GetTxAvailable() > 0) {
69 // Send at most 1040 bytes (data size in a TCP packet), as ns-3 seems to not split correctly by itself
70 uint32_t toWrite = std::min({flow->remaining_, sock->GetTxAvailable(), std::uint32_t(1040)});
72 if (toWrite == 0) { // buffer full
73 XBT_DEBUG("%f: buffer full on flow %p (still %u to go)", ns3::Simulator::Now().GetSeconds(), flow,
77 int amountSent = sock->Send(nullptr, toWrite, 0);
79 xbt_assert(amountSent > 0, "Since TxAvailable>0, amountSent should also >0");
80 flow->buffered_bytes_ += amountSent;
81 flow->remaining_ -= amountSent;
83 XBT_DEBUG("%f: sent %d bytes over flow %p (still %u to go)", ns3::Simulator::Now().GetSeconds(), amountSent, flow,
87 if (flow->buffered_bytes_ >= flow->total_bytes_) {
88 XBT_DEBUG("Closing Sockets of flow %p", flow);
89 // Closing the sockets of the receiving application
90 ns3::Ptr<ns3::PacketSink> app = ns3::DynamicCast<ns3::PacketSink, ns3::Application>(sink->Get(0));
91 ns3::Ptr<ns3::Socket> listening_sock = app->GetListeningSocket();
92 listening_sock->Close();
93 listening_sock->SetRecvCallback(ns3::MakeNullCallback<void, ns3::Ptr<ns3::Socket>>());
94 for (ns3::Ptr<ns3::Socket> accepted_sock : app->GetAcceptedSockets())
95 accepted_sock->Close();
96 // Closing the socket of the sender
101 static void datasent_cb(ns3::Ptr<ns3::Socket> socket, uint32_t dataSent)
103 /* The tracing wants to know */
104 SgFlow* flow = getFlowFromSocket(socket);
105 flow->sent_bytes_ += dataSent;
106 XBT_DEBUG("datasent_cb of F[%p, %p, %u] %u sent (%u total)", flow, flow->action_, flow->total_bytes_, dataSent,
110 static void normalClose_callback(ns3::Ptr<ns3::Socket> socket)
112 SgFlow* flow = getFlowFromSocket(socket);
113 XBT_DEBUG("normalClose_cb of F[%p, %p] total: %u; sent: %u", flow, flow->action_, flow->total_bytes_,
115 xbt_assert(flow->total_bytes_ == flow->sent_bytes_, "total_bytes (=%u) is not sent_bytes(=%u)", flow->total_bytes_,
117 xbt_assert(flow->remaining_ == 0, "Remaining is not 0 but %u", flow->remaining_);
118 receive_callback(socket);
121 XBT_ATTRIB_NORETURN static void errorClose_callback(ns3::Ptr<ns3::Socket> socket)
123 SgFlow* flow = getFlowFromSocket(socket);
124 XBT_DEBUG("errorClose_cb of F[%p, %p, %u]", flow, flow->action_, flow->total_bytes_);
125 xbt_die("ns-3: a socket was closed anormally");
128 static void succeededConnect_callback(ns3::Ptr<ns3::Socket> socket)
130 SgFlow* flow = getFlowFromSocket(socket);
131 XBT_DEBUG("succeededConnect_cb of F[%p, %p, %u]", flow, flow->action_, flow->total_bytes_);
134 XBT_ATTRIB_NORETURN static void failedConnect_callback(ns3::Ptr<ns3::Socket> socket)
136 SgFlow* mysocket = getFlowFromSocket(socket);
137 XBT_DEBUG("failedConnect_cb of F[%p, %p, %u]", mysocket, mysocket->action_, mysocket->total_bytes_);
138 xbt_die("ns-3: a socket failed to connect");
141 void start_flow(ns3::Ptr<ns3::Socket> sock, const char* to, uint16_t port_number)
143 SgFlow* flow = getFlowFromSocket(sock);
144 ns3::InetSocketAddress serverAddr(to, port_number);
146 sock->Connect(serverAddr);
147 // tell the tcp implementation to call send_cb again
148 // if we blocked and new tx buffer space becomes available
149 sock->SetSendCallback(MakeCallback(&send_cb));
150 // Notice when we actually sent some data (mostly for the TRACING module)
151 sock->SetDataSentCallback(MakeCallback(&datasent_cb));
153 XBT_DEBUG("startFlow of F[%p, %p, %u] dest=%s port=%d", flow, flow->action_, flow->total_bytes_, to, port_number);
155 sock->SetConnectCallback(MakeCallback(&succeededConnect_callback), MakeCallback(&failedConnect_callback));
156 sock->SetCloseCallbacks(MakeCallback(&normalClose_callback), MakeCallback(&errorClose_callback));