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Update Connection Close in pimp.xml #30

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Update Connection Close in pimp.xml #30

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22 changes: 9 additions & 13 deletions docs/prfc/drafts/pimp.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -403,20 +403,16 @@ PIMP A PIMP B
</figure>

</section>
<section title="PETF FIX ME">
<section title="PETF Initial Fix for Connection Close">
<t>
The reciever of the FIN packet will send a FIN-ACK. Upon reciept of the FIN-ACK, the reciever
of the FIN-ACK will wait for any outstanding data (missing sequence numbers) from the sender of
the FIN. The reciever of the FIN-ACK will also wait until any un-ACKed packets they have sent to
be ACKed and then one last ACK will be sent. The reciver of the FIN ACK will send the ACK and then close
(after sending and recieving any previous SEQs and ACKs).
The sender of the FIN ACK will wait for the last ACK.
If it doesn't recieve the ACK within the timeout period, but gotten ACKs for all
data sent and doesn't have any un-ACKed data, it will close anyway.
The sequence number and ack number in FIN, FIN-ACK and the final ACK should be the next numbers in the regular sequence.
These will NOT be seperate ACK packets. The FIN will contain the sequence number and the ACK number will be set to zero.
The FIN-ACK will contain the sender's sequence number AND ACK for the FIN. The final ACK will contain the sequence number
and ACK number for the FIN-ACK.
PIMP A and PIMP B are in the established state and PIMP A want to close the connection (i.e., PIMP A doesn’t have any new data to send).
PIMP A will send a FIN packet and go into the CLOSING state (i.e., not accepting any more data).
Once PIMP B receives the FIN packet, it will check for any outstanding data.
When PIMP B receives these data, it will (1) send a connection lost to the application layer, (2) send a FIN-ACK packet to PIMP A, (3) go into the CLOSING state, and (4) start the 3-sec timer for the ACK before connection close.
When PIMP A receives the FIN-ACK packet from PIMP B, it will send an ACK and close its connection. When PIMP B receives the ACK packet from PIMP A or if the time expires, PIMP B will close its connection.

If PIMP A and PIMP B send the FIN packet to each other at the same time, PIMP A and PIMP B will both go into the CLOSING state and wait to receives the FIN Packet from each other.
Once the FIN packet is received, it will send an ACK packet back and close the connection.
</t>
</section>
<section title="ACK Specification">
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