Re: [tsvwg] [Editorial Errata Reported] RFC9260 (7387)

[[e-mail]]

> On 16. Mar 2023, at 13:19, Randall Stewart <[e-mail]> wrote:
> 
> Yes this should be verified.. a cookie-echo timer is started
> 
> not a subsequent init timer... looks like a cut and paste typo :)
Yepp.
The text was wrong in RFC 2960 and RFC 4960 for Figure 4 and Figure 5.
It was fixed in Figure 4 of RFC 9260 by
https://www.rfc-editor.org/rfc/rfc8540#section-3.8
which goes back to
https://www.rfc-editor.org/errata/eid4400

I missed that figure 5 has the same problem.

Best regards
Michael
> 
> 
> R
> 
> On 3/16/23 7:39 AM, RFC Errata System wrote:
>> The following errata report has been submitted for RFC9260,
>> "Stream Control Transmission Protocol".
>> 
>> --------------------------------------
>> You may review the report below and at:
>> https://www.rfc-editor.org/errata/eid7387
>> 
>> --------------------------------------
>> Type: Editorial
>> Reported by: Michael Tüxen <[e-mail]>
>> 
>> Section: 5.2.4.1
>> 
>> Original Text
>> -------------
>>    Endpoint A                                          Endpoint Z
>>    <-------------- Association is established---------------------->
>>    Tag=Tag_A                                             Tag=Tag_Z
>>    <--------------------------------------------------------------->
>>    {A crashes and restarts}
>>    {app sets up an association with Z}
>>    (build TCB)
>>    INIT [I-Tag=Tag_A'
>>          & other info]  --------\
>>    (Start T1-init timer)         \
>>    (Enter COOKIE-WAIT state)      \---> (find an existing TCB,
>>                                          populate TieTags if needed,
>>                                          compose Cookie_Z with Tie-Tags
>>                                          and other info)
>>                                    /--- INIT ACK [Veri Tag=Tag_A',
>>                                   /               I-Tag=Tag_Z',
>>    (Cancel T1-init timer) <------/                Cookie_Z]
>>                                         (leave original TCB in place)
>>    COOKIE ECHO [Veri=Tag_Z',
>>                 Cookie_Z]-------\
>>    (Start T1-init timer)         \
>>    (Enter COOKIE-ECHOED state)    \---> (Find existing association,
>>                                          Tie-Tags in Cookie_Z match
>>                                          Tie-Tags in TCB,
>>                                          Tags do not match, i.e.,
>>                                          case X X M M above,
>>                                          Announce Restart to ULP
>>                                          and reset association).
>>                                   /---- COOKIE ACK
>>    (Cancel T1-init timer, <------/
>>     Enter ESTABLISHED state)
>>    {app sends 1st user data; strm 0}
>>    DATA [TSN=Initial TSN_A
>>        Strm=0,Seq=0 & user data]--\
>>    (Start T3-rtx timer)            \
>>                                     \->
>>                                  /--- SACK [TSN Ack=init TSN_A,Block=0]
>>    (Cancel T3-rtx timer) <------/
>> 
>> 
>> Corrected Text
>> --------------
>>    Endpoint A                                          Endpoint Z
>>    <-------------- Association is established---------------------->
>>    Tag=Tag_A                                             Tag=Tag_Z
>>    <--------------------------------------------------------------->
>>    {A crashes and restarts}
>>    {app sets up an association with Z}
>>    (build TCB)
>>    INIT [I-Tag=Tag_A'
>>          & other info]  --------\
>>    (Start T1-init timer)         \
>>    (Enter COOKIE-WAIT state)      \---> (find an existing TCB,
>>                                          populate TieTags if needed,
>>                                          compose Cookie_Z with Tie-Tags
>>                                          and other info)
>>                                    /--- INIT ACK [Veri Tag=Tag_A',
>>                                   /               I-Tag=Tag_Z',
>>    (Cancel T1-init timer) <------/                Cookie_Z]
>>                                         (leave original TCB in place)
>>    COOKIE ECHO [Veri=Tag_Z',
>>                 Cookie_Z]-------\
>>    (Start T1-cookie timer)       \
>>    (Enter COOKIE-ECHOED state)    \---> (Find existing association,
>>                                          Tie-Tags in Cookie_Z match
>>                                          Tie-Tags in TCB,
>>                                          Tags do not match, i.e.,
>>                                          case X X M M above,
>>                                          Announce Restart to ULP
>>                                          and reset association).
>>                                   /---- COOKIE ACK
>>    (Cancel T1-cookie timer, <----/
>>     Enter ESTABLISHED state)
>>    {app sends 1st user data; strm 0}
>>    DATA [TSN=Initial TSN_A
>>        Strm=0,Seq=0 & user data]--\
>>    (Start T3-rtx timer)            \
>>                                     \->
>>                                  /--- SACK [TSN Ack=init TSN_A,Block=0]
>>    (Cancel T3-rtx timer) <------/
>> 
>> 
>> Notes
>> -----
>> A packet containing an COOKIE-ECHO chunk is protected against loss by the T1-cookie timer, not the T1-init timer.
>> 
>> Instructions:
>> -------------
>> This erratum is currently posted as "Reported". If necessary, please
>> use "Reply All" to discuss whether it should be verified or
>> rejected. When a decision is reached, the verifying party
>> can log in to change the status and edit the report, if necessary.
>> 
>> --------------------------------------
>> RFC9260 (draft-ietf-tsvwg-rfc4960-bis-19)
>> --------------------------------------
>> Title               : Stream Control Transmission Protocol
>> Publication Date    : June 2022
>> Author(s)           : R. Stewart, M. Tüxen, K. Nielsen
>> Category            : PROPOSED STANDARD
>> Source              : Transport Area Working Group
>> Area                : Transport
>> Stream              : IETF
>> Verifying Party     : IESG