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Re: Does SCTP support out of band data

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ittium <ittium@gmail.com> wrote:
> This may be a very basic question. I did some googling but could not 
> find definitive answer
> Does SCTP support out of band data ?

To help you where to search:

<https://www.rfc-editor.org/rfc/rfc4960.txt>
| SCTP is a reliable transport protocol operating on top of a
| connectionless packet network such as IP.  It offers the following
| services to its users:
| [...]
|    --  sequenced delivery of user messages within multiple streams,
|        with an option for order-of-arrival delivery of individual
|        user messages,

The /recommended/ implementation of SCTP using a BSD socket API is
defined here:

<https://tools.ietf.org/html/draft-ietf-tsvwg-sctpsocket-15>

And in this documentation, you will not find MSG_OOB.

If this was followed strictly, or if you have something else is
depending on the implementation of your operating system. You should be
able to find the answer in the documentation of your OS.

To explain:

"Out of bad data" is a term which is not specified in SCTP, but in BSD
socket API. The wording "the underlying protocol must also support
``out-of-band'' data." in send(2) does not mean, that there must be "out
of band data" explicitely defined in the protocol description, but in
the documentation about the implementation of the protocol.

So to answer your question quickly, you could search the documentation
of the SCTP implementation of your operating system for MSG_OOB. If
there is nothing like that:

Nope.

Yours,
VB.
-- 
Wenn Du für eine Leistung nichts bezahlst,
bist Du nicht der Kunde, sondern die Ware.

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Thread

Does SCTP support out of band data ittium <ittium@gmail.com> - 2011-09-09 11:24 +0530
  Re: Does SCTP support out of band data Volker Birk <bumens@dingens.org> - 2011-09-09 10:40 +0000
  Re: Does SCTP support out of band data Stephane CHAZELAS <stephane_chazelas@yahoo.fr> - 2011-09-09 12:48 +0000
    Re: Does SCTP support out of band data ittium <ittium@gmail.com> - 2011-09-10 12:31 +0530

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