Dekker1/TCP-setup-uppaal
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Updated sequence number stuff

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This commit is contained in:
Ben Brücker 2014-01-15 11:52:38 +01:00
parent cedf077c34
commit eeffc10d9e
1 changed files with 25 additions and 22 deletions
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43
Model/model.xml
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@ -50,40 +50,43 @@ receive_packet(),
c:=0</label><nail x="-5440" y="-1408"/><nail x="-5440" y="-1664"/></transition></template><template><name>Host_Handshake</name><parameter>const int local, const int remote, const int network</parameter><declaration>clock c; c:=0</label><nail x="-5440" y="-1408"/><nail x="-5440" y="-1664"/></transition></template><template><name>Host_Handshake</name><parameter>const int local, const int remote, const int network</parameter><declaration>clock c;
meta int snd_una = 0; meta int snd_una = 0;
meta int snd_nxt = 0; meta int snd_nxt = 0;
meta int seg_ack = 0; meta int snd_ack = 0;
meta int seg_len = 0;
meta int rcv_nxt = 0; meta int rcv_nxt = 0;
const int seg_len = 0;
const int window = 1;
meta TCP_segment retrans; meta TCP_segment retrans;
meta TCP_segment received; meta TCP_segment received;
bool receive_packet(){ bool receive_packet(){
if (from_network.syn) {
rcv_nxt = from_network.seqNr;
}
if (rcv_nxt == from_network.seqNr) {
if (received.ack &amp;&amp; snd_una &lt; from_network.ackNr) {
snd_una = from_network.ackNr;
}
else if (received.ack) {
return false;
}
received := from_network; received := from_network;
snd_nxt = received.ackNr; snd_nxt = received.ackNr + 1;
seg_ack = (received.seqNr + 1 + len)%MAX_SEQ; snd_ack = (received.seqNr + 1 + seg_len)%MAX_SEQ;
initialize(from_network); initialize(from_network);
} return true;
}
int update_win(){ return false;
//TODO: do something usefull.
return 0;
}
void reset()
{
last_seq := 0;
last_ack := 0;
initialize(retrans);
initialize(received);
} }
void send(bool syn, bool ack) { void send(bool syn, bool ack) {
if (syn) {
snd_una := snd_nxt;
}
target_address = remote; target_address = remote;
retrans.syn := syn; retrans.syn := syn;
retrans.ack := ack; retrans.ack := ack;
retrans.seqNr := snd_nxt; retrans.seqNr := snd_nxt;
retrans.ackNr := seq_ack; retrans.ackNr := snd_ack;
retrans.win := update_win(); retrans.win := window;
to_network := retrans; to_network := retrans;
} }