86 lines
6.5 KiB
XML
86 lines
6.5 KiB
XML
<?xml version="1.0" encoding="utf-8"?><!DOCTYPE nta PUBLIC '-//Uppaal Team//DTD Flat System 1.1//EN' 'http://www.it.uu.se/research/group/darts/uppaal/flat-1_1.dtd'><nta><declaration>// Place global declarations here.
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const int HOSTS = 2;
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// TIMEOUT Bounds
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const int UBOUND = 600;
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const int LBOUND = 10;
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// sequence bounds
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const int MAX_SEQ = 3;
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chan Packet[HOSTS+1];
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int target_address; //Global variable to pass the target address to the network
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typedef struct {
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int syn;
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int ack;
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} TCP_packet;
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void initialize(TCP_packet& p)
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{
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p.syn := 0;
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p.ack := 0;
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}
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TCP_packet packet;</declaration><template><name>Network</name><parameter>const int network</parameter><declaration>int target; // the target for the current network packet
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TCP_packet transfer;
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void set_target() {
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target = target_address;
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}
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void receive_packet(){
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transfer := packet;
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}
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void send_packet(){
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packet := transfer;
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}
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</declaration><location id="id0" x="-672" y="-736"><name x="-682" y="-766">PacketLost</name><committed/></location><location id="id1" x="-864" y="-864"><name x="-1008" y="-888">PacketInTransit</name></location><location id="id2" x="-864" y="-608"><name x="-912" y="-584">ReadyToReceive</name></location><init ref="id2"/><transition><source ref="id0"/><target ref="id2"/></transition><transition><source ref="id1"/><target ref="id2"/><label kind="synchronisation" x="-976" y="-768">Packet[target]!</label><label kind="assignment" x="-968" y="-752">send_packet()</label></transition><transition><source ref="id2"/><target ref="id1"/><label kind="synchronisation" x="-1120" y="-784">Packet[network]?</label><label kind="assignment" x="-1120" y="-768">set_target(),
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receive_packet()</label><nail x="-992" y="-608"/><nail x="-992" y="-864"/><nail x="-992" y="-864"/></transition></template><template><name>Host_Handshake</name><parameter>const int local, const int remote, const int network</parameter><declaration>clock c;
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int last_syn = 0;
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int last_ack = 0;
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TCP_packet received;
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void set_target(int syn, int ack) {
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target_address = remote;
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packet.syn = syn;
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packet.ack = ack;
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}
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void receive_packet(){
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received = packet;
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}
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int update_syn(){
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last_syn = (last_syn % MAX_SEQ) +1;
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return last_syn;
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}
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int update_ack(){
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last_ack = received.syn;
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return last_ack;
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}
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void initialize()
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{
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last_syn := 0;
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last_ack := 0;
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}</declaration><location id="id3" x="-96" y="0"><committed/></location><location id="id4" x="-384" y="-96"><committed/></location><location id="id5" x="-672" y="-192"><committed/></location><location id="id6" x="-384" y="0"><name x="-416" y="16">Established</name></location><location id="id7" x="-672" y="-96"><name x="-752" y="-104">SynRcvd</name></location><location id="id8" x="-96" y="-96"><name x="-56" y="-136">SynSent</name><label kind="invariant" x="-64" y="-120">c <= UBOUND</label></location><location id="id9" x="-384" y="-192"><name x="-400" y="-232">Listen</name></location><location id="id10" x="-384" y="-384"><name x="-456" y="-384">Closed</name></location><init ref="id10"/><transition><source ref="id6"/><target ref="id6"/><nail x="-432" y="64"/><nail x="-352" y="64"/></transition><transition><source ref="id8"/><target ref="id8"/><label kind="guard" x="40" y="-104">c > LBOUND</label><label kind="synchronisation" x="40" y="-88">Packet[network]!</label><label kind="assignment" x="40" y="-72">set_target(last_syn, 0),
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c := 0</label><nail x="32" y="-64"/><nail x="32" y="-96"/></transition><transition><source ref="id10"/><target ref="id10"/><label kind="synchronisation" x="-480" y="-512">Packet[local]?</label><nail x="-368" y="-496"/><nail x="-400" y="-496"/></transition><transition><source ref="id3"/><target ref="id6"/><label kind="synchronisation" x="-288" y="-40">Packet[network]!</label><label kind="assignment" x="-328" y="-24">set_target(0, update_ack())</label></transition><transition><source ref="id4"/><target ref="id7"/><label kind="synchronisation" x="-520" y="-144">Packet[network]!</label><label kind="assignment" x="-560" y="-128">set_target(0, update_ack()),
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c := 0</label></transition><transition><source ref="id5"/><target ref="id7"/><label kind="synchronisation" x="-808" y="-176">Packet[network]!</label><label kind="assignment" x="-952" y="-160">set_target(update_syn(), update_ack()),
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c := 0</label></transition><transition><source ref="id9"/><target ref="id5"/><label kind="guard" x="-584" y="-240">packet.syn != 0 &&
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packet.ack == 0</label><label kind="synchronisation" x="-584" y="-256">Packet[local]?</label><label kind="assignment" x="-584" y="-216">receive_packet()</label></transition><transition><source ref="id8"/><target ref="id3"/><label kind="guard" x="-88" y="-40">packet.ack == last_syn &&
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packet.syn != 0</label><label kind="synchronisation" x="-88" y="-56">Packet[local]?</label><label kind="assignment" x="-72" y="-8">receive_packet()</label></transition><transition><source ref="id8"/><target ref="id4"/><label kind="guard" x="-288" y="-144">packet.syn != 0 &&
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packet.ack == 0</label><label kind="synchronisation" x="-288" y="-160">Packet[local]?</label><label kind="assignment" x="-288" y="-120">receive_packet()</label></transition><transition><source ref="id9"/><target ref="id8"/><label kind="synchronisation" x="-296" y="-232">Packet[network]!</label><label kind="assignment" x="-320" y="-216">set_target(update_syn(), 0)</label><nail x="-128" y="-192"/><nail x="-128" y="-128"/></transition><transition><source ref="id7"/><target ref="id6"/><label kind="guard" x="-608" y="-56">packet.ack == last_syn &&
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packet.syn == 0</label><label kind="synchronisation" x="-608" y="-72">Packet[local]?</label><label kind="assignment" x="-608" y="-24">receive_packet()</label><nail x="-672" y="0"/></transition><transition><source ref="id8"/><target ref="id10"/><nail x="-64" y="-128"/><nail x="-64" y="-416"/><nail x="-352" y="-416"/></transition><transition><source ref="id10"/><target ref="id8"/><label kind="synchronisation" x="-240" y="-384">Packet[network]!</label><label kind="assignment" x="-240" y="-368">initialize(),
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set_target(update_syn(), 0),
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c := 0</label><nail x="-96" y="-384"/></transition><transition><source ref="id9"/><target ref="id10"/><nail x="-352" y="-224"/><nail x="-352" y="-352"/></transition><transition><source ref="id10"/><target ref="id9"/><label kind="assignment" x="-488" y="-296">initialize()</label><nail x="-416" y="-352"/><nail x="-416" y="-224"/></transition></template><system>Network1 = Network(0);
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Network2 = Network(0);
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Network3 = Network(0);
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Network4 = Network(0);
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Host1Handshake = Host_Handshake(1,2,0);
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Host2Handshake = Host_Handshake(2,1,0);
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system Network1, Network2 ,Host1Handshake,Host2Handshake;
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</system></nta> |