rfc793bis_section_3.10.7.4_original_elided.txt   rfc793bis_section_3.10.7.4_updated_bullets_elided.txt 
Otherwise, Otherwise,
first check sequence number 1. first check sequence number
- SYN-RECEIVED STATE * SYN-RECEIVED STATE
ESTABLISHED STATE * ESTABLISHED STATE
FIN-WAIT-1 STATE * FIN-WAIT-1 STATE
FIN-WAIT-2 STATE * FIN-WAIT-2 STATE
CLOSE-WAIT STATE * CLOSE-WAIT STATE
CLOSING STATE * CLOSING STATE
LAST-ACK STATE * LAST-ACK STATE
TIME-WAIT STATE * TIME-WAIT STATE
o Segments are processed in sequence. Initial tests ... - Segments are processed in sequence. Initial tests ...
o In general, the processing of received segments MUST ... - In general, the processing of received segments MUST ...
o There are four cases for the acceptability test for ... - There are four cases for the acceptability test for ...
Segment Receive Test +=========+=========+==============================+
Length Window | Segment | Receive | Test |
------- ------- ------------------------------------ ... | Length | Window | |
+=========+=========+========================== ....
o In implementing sequence number validation as described ... - In implementing sequence number validation as described ...
o If the RCV.WND is zero, no segments will be acceptable, ... - If the RCV.WND is zero, no segments will be acceptable, ...
o If an incoming segment is not acceptable, an ... - If an incoming segment is not acceptable, an ...
+ <SEQ=SND.NXT><ACK=RCV.NXT><CTL=ACK> o <SEQ=SND.NXT><ACK=RCV.NXT><CTL=ACK>
o After sending the acknowledgment, drop the unacceptable ... - After sending the acknowledgment, drop the unacceptable ...
o Note that for the TIME-WAIT state, there is an improved ... - Note that for the TIME-WAIT state, there is an improved ...
o In the following it is assumed that the segment is the ... - In the following it is assumed that the segment is the ...
- second check the RST bit, 2. second check the RST bit,
o RFC 5961 [9] section 3 describes a potential blind reset ... * RFC 5961 [9] section 3 describes a potential blind reset ...
+ 1) If the RST bit is set and the sequence number is ... 1) If the RST bit is set and the sequence number is ...
+ 2) If the RST bit is set and the sequence number exactly ... 2) If the RST bit is set and the sequence number exactly ...
+ 3) If the RST bit is set and the sequence number does not ... 3) If the RST bit is set and the sequence number does not ...
<SEQ=SND.NXT><ACK=RCV.NXT><CTL=ACK> <SEQ=SND.NXT><ACK=RCV.NXT><CTL=ACK>
After sending the challenge ACK, TCP endpoints MUST ... After sending the challenge ACK, TCP endpoints MUST ...
o SYN-RECEIVED STATE * SYN-RECEIVED STATE
+ If the RST bit is set - If the RST bit is set
* If this connection was initiated with a passive ... o If this connection was initiated with a passive ...
o ESTABLISHED * ESTABLISHED
FIN-WAIT-1 * FIN-WAIT-1
FIN-WAIT-2 * FIN-WAIT-2
CLOSE-WAIT * CLOSE-WAIT
+ If the RST bit is set then, any outstanding RECEIVEs ... - If the RST bit is set then, any outstanding RECEIVEs ...
o CLOSING STATE * CLOSING STATE
LAST-ACK STATE * LAST-ACK STATE
TIME-WAIT * TIME-WAIT
+ If the RST bit is set then, enter the CLOSED state ... - If the RST bit is set then, enter the CLOSED state ...
- third check security 3. third check security
o SYN-RECEIVED * SYN-RECEIVED
+ If the security/compartment in the segment does not ... - If the security/compartment in the segment does not ...
o ESTABLISHED * ESTABLISHED
FIN-WAIT-1 * FIN-WAIT-1
FIN-WAIT-2 * FIN-WAIT-2
CLOSE-WAIT * CLOSE-WAIT
CLOSING * CLOSING
LAST-ACK * LAST-ACK
TIME-WAIT * TIME-WAIT
+ If the security/compartment in the segment does not ... - If the security/compartment in the segment does not ...
o Note this check is placed following the sequence check ... * Note this check is placed following the sequence check ...
- fourth, check the SYN bit, 4. fourth, check the SYN bit,
o SYN-RECEIVED * SYN-RECEIVED
+ If the connection was initiated with a passive OPEN ... - If the connection was initiated with a passive OPEN ...
ESTABLISHED STATE * ESTABLISHED STATE
FIN-WAIT STATE-1 * FIN-WAIT STATE-1
FIN-WAIT STATE-2 * FIN-WAIT STATE-2
CLOSE-WAIT STATE * CLOSE-WAIT STATE
CLOSING STATE * CLOSING STATE
LAST-ACK STATE * LAST-ACK STATE
TIME-WAIT STATE * TIME-WAIT STATE
+ If the SYN bit is set in these synchronized states ... - If the SYN bit is set in these synchronized states ...
+ <SEQ=SND.NXT><ACK=RCV.NXT><CTL=ACK> - <SEQ=SND.NXT><ACK=RCV.NXT><CTL=ACK>
+ After sending the acknowledgement, TCP implementations ... - After sending the acknowledgement, TCP implementations ...
+ For implementations that do not follow RFC 5961 ... - For implementations that do not follow RFC 5961 ...
+ If the SYN is not in the window this step would ... - If the SYN is not in the window this step would ...
- fifth check the ACK field, 5. fifth check the ACK field,
o if the ACK bit is off drop the segment and return * if the ACK bit is off drop the segment and return
o if the ACK bit is on * if the ACK bit is on
+ RFC 5961 [9] section 5 describes a potential blind data ... - RFC 5961 [9] section 5 describes a potential blind data ...
+ SYN-RECEIVED STATE - SYN-RECEIVED STATE
* If SND.UNA < SEG.ACK =< SND.NXT then enter ESTABLISHED ... o If SND.UNA < SEG.ACK =< SND.NXT then enter ESTABLISHED ...
- SND.WND <- SEG.WND + SND.WND <- SEG.WND
SND.WL1 <- SEG.SEQ + SND.WL1 <- SEG.SEQ
SND.WL2 <- SEG.ACK + SND.WL2 <- SEG.ACK
* If the segment acknowledgment is not acceptable, form ... o If the segment acknowledgment is not acceptable, form ...
- <SEQ=SEG.ACK><CTL=RST> + <SEQ=SEG.ACK><CTL=RST>
* and send it. o and send it.
+ ESTABLISHED STATE - ESTABLISHED STATE
* If SND.UNA < SEG.ACK =< SND.NXT then, set SND.UNA ... o If SND.UNA < SEG.ACK =< SND.NXT then, set SND.UNA ...
* If SND.UNA =< SEG.ACK =< SND.NXT, the send window ... o If SND.UNA =< SEG.ACK =< SND.NXT, the send window ...
* Note that SND.WND is an offset from SND.UNA, ... o Note that SND.WND is an offset from SND.UNA, ...
+ FIN-WAIT-1 STATE - FIN-WAIT-1 STATE
* In addition to the processing for the ESTABLISHED ... o In addition to the processing for the ESTABLISHED ...
+ FIN-WAIT-2 STATE - FIN-WAIT-2 STATE
* In addition to the processing for the ESTABLISHED ... o In addition to the processing for the ESTABLISHED ...
+ CLOSE-WAIT STATE - CLOSE-WAIT STATE
* Do the same processing as for the ESTABLISHED state. o Do the same processing as for the ESTABLISHED state.
+ CLOSING STATE - CLOSING STATE
* In addition to the processing for the ESTABLISHED ... o In addition to the processing for the ESTABLISHED ...
+ LAST-ACK STATE - LAST-ACK STATE
* The only thing that can arrive in this state is ... o The only thing that can arrive in this state is ...
+ TIME-WAIT STATE - TIME-WAIT STATE
* The only thing that can arrive in this state is ... o The only thing that can arrive in this state is ...
- sixth, check the URG bit, 6. sixth, check the URG bit,
o ESTABLISHED STATE * ESTABLISHED STATE
FIN-WAIT-1 STATE * FIN-WAIT-1 STATE
FIN-WAIT-2 STATE * FIN-WAIT-2 STATE
+ If the URG bit is set, RCV.UP <- max(RCV.UP,SEG.UP) ... - If the URG bit is set, RCV.UP <- max(RCV.UP,SEG.UP) ...
o CLOSE-WAIT STATE * CLOSE-WAIT STATE
CLOSING STATE * CLOSING STATE
LAST-ACK STATE * LAST-ACK STATE
TIME-WAIT * TIME-WAIT
+ This should not occur, since a FIN has been received ... - This should not occur, since a FIN has been received ...
- seventh, process the segment text, 7. seventh, process the segment text,
o ESTABLISHED STATE * ESTABLISHED STATE
FIN-WAIT-1 STATE * FIN-WAIT-1 STATE
FIN-WAIT-2 STATE * FIN-WAIT-2 STATE
+ Once in the ESTABLISHED state, it is possible to ... - Once in the ESTABLISHED state, it is possible to ...
+ When the TCP endpoint takes responsibility for ... - When the TCP endpoint takes responsibility for ...
+ Once the TCP endpoint takes responsibility for ... - Once the TCP endpoint takes responsibility for ...
+ A TCP implementation MAY send an ACK segment ... - A TCP implementation MAY send an ACK segment ...
+ Please note the window management suggestions in ... - Please note the window management suggestions in ...
+ Send an acknowledgment of the form: - Send an acknowledgment of the form:
* <SEQ=SND.NXT><ACK=RCV.NXT><CTL=ACK> o <SEQ=SND.NXT><ACK=RCV.NXT><CTL=ACK>
+ This acknowledgment should be piggybacked on a ... - This acknowledgment should be piggybacked on a ...
o CLOSE-WAIT STATE * CLOSE-WAIT STATE
CLOSING STATE * CLOSING STATE
LAST-ACK STATE * LAST-ACK STATE
TIME-WAIT STATE * TIME-WAIT STATE
+ This should not occur, since a FIN has been received ... - This should not occur, since a FIN has been received ...
- eighth, check the FIN bit, 8. eighth, check the FIN bit,
o Do not process the FIN if the state is CLOSED, LISTEN ... * Do not process the FIN if the state is CLOSED, LISTEN ...
o If the FIN bit is set, signal the user "connection ... * If the FIN bit is set, signal the user "connection ...
+ SYN-RECEIVED STATE - SYN-RECEIVED STATE
ESTABLISHED STATE - ESTABLISHED STATE
* Enter the CLOSE-WAIT state. o Enter the CLOSE-WAIT state.
+ FIN-WAIT-1 STATE - FIN-WAIT-1 STATE
* If our FIN has been ACKed (perhaps in this ... o If our FIN has been ACKed (perhaps in this ...
+ FIN-WAIT-2 STATE - FIN-WAIT-2 STATE
* Enter the TIME-WAIT state. Start the time-wait ... o Enter the TIME-WAIT state. Start the time-wait ...
+ CLOSE-WAIT STATE - CLOSE-WAIT STATE
* Remain in the CLOSE-WAIT state. o Remain in the CLOSE-WAIT state.
+ CLOSING STATE - CLOSING STATE
* Remain in the CLOSING state. o Remain in the CLOSING state.
+ LAST-ACK STATE - LAST-ACK STATE
* Remain in the LAST-ACK state. o Remain in the LAST-ACK state.
+ TIME-WAIT STATE - TIME-WAIT STATE
* Remain in the TIME-WAIT state. Restart the 2 MSL ... o Remain in the TIME-WAIT state. Restart the 2 MSL ...
- and return. 9. and return.
 End of changes. 140 change blocks. 
141 lines changed or deleted 142 lines changed or added

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