netdev - Re: [PATCH] sctp: Make "Invalid Stream Identifier" ERROR follows SACK when bundling

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Date:	Thu, 26 Jul 2012 09:30:48 +0800
From:	Xufeng Zhang <xufengzhang.main@...il.com>
To:	Vlad Yasevich <vyasevich@...il.com>
Cc:	Neil Horman <nhorman@...driver.com>,
	xufeng zhang <xufeng.zhang@...driver.com>, sri@...ibm.com,
	davem@...emloft.net, linux-sctp@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sctp: Make "Invalid Stream Identifier" ERROR follows SACK
 when bundling

On 7/25/12, Vlad Yasevich <vyasevich@...il.com> wrote:
>> And after take a moment to look into the relative codes, I think we
>> can implement it
>> by below way:
>> 1). Add a flag(isi_err_needed) in the embedded struct peer of struct
>> struct sctp_association
>> just like sack_needed flag.
>> 2). When "invalid stream identifier" ERROR happens in sctp_eat_data()
>> function, we just
>> set isi_err_needed flag and don't create ERROR chunk and also don't
>> insert SCTP_CMD_REPLY command.
>> 3). In sctp_gen_sack() function, we create ERROR chunk and also insert
>> SCTP_CMD_REPLY command if isi_err_needed flag is set.
>>
>> Is this way proper?
>>
>
> So, I looked at the code, and it looks very simple to do.  We already
> return a specific status from sctp_eat_data() when the error was
> generated.  All you have to do is take the code that generates the error
> and adds it to the command list and give it its own small function that
> you can then call if SCTP_IERROR_BAD_STREAM error was returned.

No, it will still has the same problem by just doing this.
SCTP_CMD_GEN_SACK command actually don't enqueue SACK to outqueue,
sctp_gen_sack() do this things when processing SCTP_CMD_GEN_SACK command
in sctp_cmd_interpreter().
So it's not enough if we just insert SCTP_ERROR_INV_STRM command after
sctp_eat_data() return SCTP_IERROR_BAD_STREAM in sctp_sf_eat_data_6_2().



Thanks,
Xufeng Zhang

>
> -vlad
>
>>
>> Thanks,
>> Xufeng Zhang
>>>
>>>
>>>
>>> Thanks,
>>> Xufeng Zhang
>>>>
>>>> -vlad
>>>>>
>>>>> Thanks,
>>>>> Xufeng Zhang
>>>>>>
>>>>>> -vlad
>>>>
>>>>
>>>> --
>>>> Sent from my Android phone with SkitMail. Please excuse my brevity.
>>>>
>>>
>
>
>
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