netdev - Re: SCTP and IP

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Message-ID: <520943E2.7010408@gmail.com>
Date:	Mon, 12 Aug 2013 16:21:54 -0400
From:	Vlad Yasevich <vyasevich@...il.com>
To:	Ben Greear <greearb@...delatech.com>
CC:	netdev <netdev@...r.kernel.org>
Subject: Re: SCTP and IP_TOS

On 08/12/2013 01:00 PM, Ben Greear wrote:
> Hello!
>
> I notice that I read 0x2 as IP_TOS getsockopt on an SCTP socket configured
> for streaming mode.
>
> Looks to me like the reason is that SCTP uses a socket type of
> SCTP_SOCKET_TCP
> and the ipv4/ip_sockglue.c code is only masking out ECN for SOCK_STREAM
> types.
>
> Is this per design, or should the ip_sockglue.c mask out ECN for
> SCTP_SOCKET_TCP
> types as well?
>
> Thanks,
> Ben
>

 From the ip_glue perspective, you would see either SOCK_STREAM or
SOCK_SEQPACKET.

So you are trying to set tos bits on a SEQPACKET socket, ip_sockglue()
wouldn't try preserver current ECN bits as it does for STREAM sockets.

-vlad


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