92 lines
8.4 KiB
XML
92 lines
8.4 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 to_network;
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TCP_packet from_network;</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 := to_network;
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initialize(to_network);
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}
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void send_packet(){
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from_network := transfer;
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}
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</declaration><location id="id0" x="-864" y="-736"><committed/></location><location id="id1" x="-672" y="-736"><name x="-682" y="-766">PacketLost</name><committed/></location><location id="id2" x="-864" y="-864"><name x="-1008" y="-888">PacketInTransit</name></location><location id="id3" x="-864" y="-608"><name x="-912" y="-584">ReadyToReceive</name></location><init ref="id3"/><transition><source ref="id0"/><target ref="id2"/><label kind="assignment" x="-848" y="-760">initialize(from_network)</label><nail x="-832" y="-792"/></transition><transition><source ref="id0"/><target ref="id3"/><label kind="synchronisation" x="-976" y="-688">Packet[target]!</label></transition><transition><source ref="id2"/><target ref="id0"/><label kind="assignment" x="-968" y="-792">send_packet()</label></transition><transition><source ref="id2"/><target ref="id1"/></transition><transition><source ref="id1"/><target ref="id3"/></transition><transition><source ref="id3"/><target ref="id2"/><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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to_network.syn = syn;
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to_network.ack = ack;
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}
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void receive_packet(){
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received = from_network;
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initialize(from_network);
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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="id4" x="-520" y="-672"><name x="-528" y="-656">SynRcvd1</name><label kind="invariant" x="-536" y="-640">c <= UBOUND</label></location><location id="id5" x="-104" y="-448"><committed/></location><location id="id6" x="-392" y="-544"><committed/></location><location id="id7" x="-880" y="-872"><committed/></location><location id="id8" x="-392" y="-448"><name x="-424" y="-432">Established</name></location><location id="id9" x="-880" y="-544"><name x="-976" y="-576">SynRcvd2</name><label kind="invariant" x="-1000" y="-560">c <= UBOUND</label></location><location id="id10" x="-104" y="-544"><name x="-64" y="-584">SynSent</name><label kind="invariant" x="-72" y="-568">c <= UBOUND</label></location><location id="id11" x="-392" y="-872"><name x="-408" y="-912">Listen</name></location><location id="id12" x="-392" y="-1064"><name x="-464" y="-1064">Closed</name></location><init ref="id12"/><transition><source ref="id8"/><target ref="id8"/><nail x="-400" y="-480"/><nail x="-432" y="-480"/></transition><transition><source ref="id4"/><target ref="id8"/><label kind="guard" x="-632" y="-584">from_network.ack == last_syn &&
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from_network.syn == 0</label><label kind="synchronisation" x="-632" y="-600">Packet[local]?</label><label kind="assignment" x="-632" y="-552">receive_packet()</label><nail x="-648" y="-672"/><nail x="-648" y="-512"/><nail x="-392" y="-512"/></transition><transition><source ref="id4"/><target ref="id4"/><label kind="guard" x="-552" y="-792">c > LBOUND</label><label kind="synchronisation" x="-552" y="-808">Packet[network]!</label><label kind="assignment" x="-552" y="-776">set_target(0, last_ack),
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c:=0</label><nail x="-484" y="-738"/><nail x="-556" y="-738"/></transition><transition><source ref="id6"/><target ref="id4"/><label kind="synchronisation" x="-384" y="-679">Packet[network]!</label><label kind="assignment" x="-384" y="-664">set_target(0, update_ack()),
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c := 0</label><nail x="-392" y="-672"/></transition><transition><source ref="id9"/><target ref="id9"/><label kind="guard" x="-1216" y="-544">c > LBOUND</label><label kind="synchronisation" x="-1216" y="-560">Packet[network]!</label><label kind="assignment" x="-1216" y="-528">set_target(last_syn, last_ack),
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c:=0</label><nail x="-1008" y="-544"/><nail x="-1008" y="-512"/></transition><transition><source ref="id10"/><target ref="id10"/><label kind="guard" x="32" y="-552">c > LBOUND</label><label kind="synchronisation" x="32" y="-536">Packet[network]!</label><label kind="assignment" x="32" y="-520">set_target(last_syn, 0),
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c := 0</label><nail x="24" y="-512"/><nail x="24" y="-544"/></transition><transition><source ref="id12"/><target ref="id12"/><label kind="synchronisation" x="-528" y="-1192">Packet[local]?</label><label kind="assignment" x="-528" y="-1176">receive_packet()</label><nail x="-376" y="-1176"/><nail x="-408" y="-1176"/></transition><transition><source ref="id5"/><target ref="id8"/><label kind="synchronisation" x="-296" y="-488">Packet[network]!</label><label kind="assignment" x="-336" y="-472">set_target(0, update_ack())</label></transition><transition><source ref="id7"/><target ref="id9"/><label kind="synchronisation" x="-1160" y="-824">Packet[network]!</label><label kind="assignment" x="-1160" y="-808">set_target(update_syn(), update_ack()),
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c := 0</label></transition><transition><source ref="id11"/><target ref="id7"/><label kind="guard" x="-592" y="-920">from_network.syn != 0 &&
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from_network.ack == 0</label><label kind="synchronisation" x="-592" y="-936">Packet[local]?</label><label kind="assignment" x="-592" y="-896">receive_packet()</label></transition><transition><source ref="id10"/><target ref="id5"/><label kind="guard" x="-96" y="-488">from_network.ack == last_syn &&
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from_network.syn != 0</label><label kind="synchronisation" x="-96" y="-504">Packet[local]?</label><label kind="assignment" x="-80" y="-456">receive_packet()</label></transition><transition><source ref="id10"/><target ref="id6"/><label kind="guard" x="-296" y="-592">from_network.syn != 0 &&
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from_network.ack == 0</label><label kind="synchronisation" x="-296" y="-608">Packet[local]?</label><label kind="assignment" x="-296" y="-568">receive_packet()</label></transition><transition><source ref="id11"/><target ref="id10"/><label kind="synchronisation" x="-320" y="-920">Packet[network]!</label><label kind="assignment" x="-320" y="-904">set_target(update_syn(), 0),
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c := 0</label><nail x="-136" y="-872"/><nail x="-136" y="-576"/></transition><transition><source ref="id9"/><target ref="id8"/><label kind="guard" x="-872" y="-432">from_network.ack == last_syn &&
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from_network.syn == 0</label><label kind="synchronisation" x="-872" y="-448">Packet[local]?</label><label kind="assignment" x="-872" y="-400">receive_packet()</label><nail x="-880" y="-448"/></transition><transition><source ref="id10"/><target ref="id12"/><nail x="-72" y="-576"/><nail x="-72" y="-1096"/><nail x="-360" y="-1096"/></transition><transition><source ref="id12"/><target ref="id10"/><label kind="synchronisation" x="-248" y="-1064">Packet[network]!</label><label kind="assignment" x="-248" y="-1048">initialize(),
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set_target(update_syn(), 0),
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c := 0</label><nail x="-104" y="-1064"/></transition><transition><source ref="id11"/><target ref="id12"/><nail x="-360" y="-904"/><nail x="-360" y="-1032"/></transition><transition><source ref="id12"/><target ref="id11"/><label kind="assignment" x="-496" y="-976">initialize()</label><nail x="-424" y="-1032"/><nail x="-424" y="-904"/></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, Network3,Host1Handshake,Host2Handshake;
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</system></nta> |