RE: [Lksctp-developers] INIT transmission in response to state cookie err

[Chandrasekhar V <Cha...@wi...>]

I have seen this with a SCTP protocol tester, which deliberately sends
stale cookie error in one of the tests.


-Thanks,
Chandu

-----Original Message-----
From: lks...@li...
[mailto:lks...@li...] On Behalf Of
Sridhar Samudrala
Sent: Tuesday, November 25, 2003 4:29 AM
To: Chandrasekhar V
Cc: lks...@li...
Subject: Re: [Lksctp-developers] INIT transmission in response to state
cookie err


This could be a problem. Are you seeing this issue with lksctp when
interacting with other implementations? In lksctp, a cookie preservative
parameter is sent with INIT suggesting a cookie-life span in response to
a stale cookie error. This should prevent future stale-cookie errors.
But of course this will not help if the peer doesn't honor the cookie
preservative parameters.

So i don't expect to see this problem between 2 lksctp peers.

Do you have a solution to fix this problem?

Thanks
Sridhar

On Fri, 21 Nov 2003, Chandrasekhar V wrote:

> Hello All,
>
> Function sctp_sf_do_5_2_6_stale() from sm_statesfuns.c sends an INIT ,

> starts SCTP_EVENT_TIMEOUT_T1_INIT timer and increments init error 
> counter.
>
> This function exits after max init attempts
> code excerpts from sctp_sf_do_5_2_6_stale() :
> =========
> attempts = asoc->counters[SCTP_COUNTER_INIT_ERROR] + 1;
>
>         if (attempts >= asoc->max_init_attempts) {
>                 sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED,
>                                 SCTP_U32(SCTP_ERROR_STALE_COOKIE));
>                 return SCTP_DISPOSITION_DELETE_TCB;
>         }
> ..
> ......
> ....
>   sctp_add_cmd_sf(commands, SCTP_CMD_COUNTER_INC,
>                         SCTP_COUNTER(SCTP_COUNTER_INIT_ERROR));
>
> ===========
>
> However, if an INIT_ACK arrives then asoc's SCTP_COUNTER_INIT_ERROR is

> reset by function sctp_sf_do_5_1C_ack()
>
> sctp_add_cmd_sf(commands, SCTP_CMD_COUNTER_RESET,
>                         SCTP_COUNTER(SCTP_COUNTER_INIT_ERROR));
>
> ===========
>
>
> Does this leave a problem of indefinite loop if stale cooke error is 
> persistent? Can this problem appear in practical ?
>
> Thanks for your time,
> Chandu
>
>
>


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