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 static SgFlow* getFlowFromSocket(ns3::Ptr<ns3::Socket> socket)
30 auto it = flow_from_sock.find(transform_socket_ptr(socket));
31 return (it == flow_from_sock.end()) ? nullptr : it->second;
34 static ns3::ApplicationContainer* getSinkFromSocket(ns3::Ptr<ns3::Socket> socket)
36 auto it = sink_from_sock.find(transform_socket_ptr(socket));
37 return (it == sink_from_sock.end()) ? nullptr : &(it->second);
40 static void receive_callback(ns3::Ptr<ns3::Socket> socket)
42 SgFlow* flow = getFlowFromSocket(socket);
43 XBT_DEBUG("received on F[%p, total: %u, remain: %u]", flow, flow->total_bytes_, flow->remaining_);
45 if (not flow->finished_) {
46 flow->finished_ = true;
47 XBT_DEBUG("recv_cb of F[%p, %p, %u]", flow, flow->action_, flow->total_bytes_);
48 XBT_DEBUG("Stop simulator at %f seconds", ns3::Simulator::Now().GetSeconds());
49 ns3::Simulator::Stop();
53 static void send_cb(ns3::Ptr<ns3::Socket> sock, uint32_t /*txSpace*/)
55 SgFlow* flow = getFlowFromSocket(sock);
56 const ns3::ApplicationContainer* sink = getSinkFromSocket(sock);
57 XBT_DEBUG("Asked to write on F[%p, total: %u, remain: %u]", flow, flow->total_bytes_, flow->remaining_);
59 if (flow->remaining_ == 0) // all data was already buffered (and socket was already closed)
62 /* While not all is buffered and there remain space in the buffers */
63 while (flow->buffered_bytes_ < flow->total_bytes_ && sock->GetTxAvailable() > 0) {
64 // Send at most 1040 bytes (data size in a TCP packet), as ns-3 seems to not split correctly by itself
65 uint32_t toWrite = std::min({flow->remaining_, sock->GetTxAvailable(), std::uint32_t(1040)});
67 if (toWrite == 0) { // buffer full
68 XBT_DEBUG("%f: buffer full on flow %p (still %u to go)", ns3::Simulator::Now().GetSeconds(), flow,
72 int amountSent = sock->Send(nullptr, toWrite, 0);
74 xbt_assert(amountSent > 0, "Since TxAvailable>0, amountSent should also >0");
75 flow->buffered_bytes_ += amountSent;
76 flow->remaining_ -= amountSent;
78 XBT_DEBUG("%f: sent %d bytes over flow %p (still %u to go)", ns3::Simulator::Now().GetSeconds(), amountSent, flow,
82 if (flow->buffered_bytes_ >= flow->total_bytes_) {
83 XBT_DEBUG("Closing Sockets of flow %p", flow);
84 // Closing the sockets of the receiving application
85 ns3::Ptr<ns3::PacketSink> app = ns3::DynamicCast<ns3::PacketSink, ns3::Application>(sink->Get(0));
86 ns3::Ptr<ns3::Socket> listening_sock = app->GetListeningSocket();
87 listening_sock->Close();
88 listening_sock->SetRecvCallback(ns3::MakeNullCallback<void, ns3::Ptr<ns3::Socket>>());
89 for (ns3::Ptr<ns3::Socket> accepted_sock : app->GetAcceptedSockets())
90 accepted_sock->Close();
91 // Closing the socket of the sender
96 static void datasent_cb(ns3::Ptr<ns3::Socket> socket, uint32_t dataSent)
98 /* The tracing wants to know */
99 SgFlow* flow = getFlowFromSocket(socket);
100 flow->sent_bytes_ += dataSent;
101 XBT_DEBUG("datasent_cb of F[%p, %p, %u] %u sent (%u total)", flow, flow->action_, flow->total_bytes_, dataSent,
105 static void normalClose_callback(ns3::Ptr<ns3::Socket> socket)
107 SgFlow* flow = getFlowFromSocket(socket);
108 XBT_DEBUG("normalClose_cb of F[%p, %p] total: %u; sent: %u", flow, flow->action_, flow->total_bytes_,
110 xbt_assert(flow->total_bytes_ == flow->sent_bytes_, "total_bytes (=%u) is not sent_bytes(=%u)", flow->total_bytes_,
112 xbt_assert(flow->remaining_ == 0, "Remaining is not 0 but %u", flow->remaining_);
113 receive_callback(socket);
116 XBT_ATTRIB_NORETURN static void errorClose_callback(ns3::Ptr<ns3::Socket> socket)
118 SgFlow* flow = getFlowFromSocket(socket);
119 XBT_DEBUG("errorClose_cb of F[%p, %p, %u]", flow, flow->action_, flow->total_bytes_);
120 xbt_die("ns-3: a socket was closed anormally");
123 static void succeededConnect_callback(ns3::Ptr<ns3::Socket> socket)
125 SgFlow* flow = getFlowFromSocket(socket);
126 XBT_DEBUG("succeededConnect_cb of F[%p, %p, %u]", flow, flow->action_, flow->total_bytes_);
129 XBT_ATTRIB_NORETURN static void failedConnect_callback(ns3::Ptr<ns3::Socket> socket)
131 SgFlow* mysocket = getFlowFromSocket(socket);
132 XBT_DEBUG("failedConnect_cb of F[%p, %p, %u]", mysocket, mysocket->action_, mysocket->total_bytes_);
133 xbt_die("ns-3: a socket failed to connect");
136 void start_flow(ns3::Ptr<ns3::Socket> sock, const char* to, uint16_t port_number)
138 SgFlow* flow = getFlowFromSocket(sock);
140 ns3::InetSocketAddress serverAddr(to, port_number);
141 sock->Connect(serverAddr);
143 // tell the network implementation to call send_cb again
144 // if we blocked and new tx buffer space becomes available
145 sock->SetSendCallback(MakeCallback(&send_cb));
146 // Notice when we actually sent some data (mostly for the TRACING module)
147 sock->SetDataSentCallback(MakeCallback(&datasent_cb));
149 XBT_DEBUG("startFlow of F[%p, %p, %u] dest=%s port=%d", flow, flow->action_, flow->total_bytes_, to, port_number);
151 sock->SetConnectCallback(MakeCallback(&succeededConnect_callback), MakeCallback(&failedConnect_callback));
152 sock->SetCloseCallbacks(MakeCallback(&normalClose_callback), MakeCallback(&errorClose_callback));