netdev - Re: [PATCH] SCTP: enable cookie-echo retransmission transport switch

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Message-ID: <4851C3AD.9030600@cn.fujitsu.com>
Date:	Fri, 13 Jun 2008 08:47:41 +0800
From:	Gui Jianfeng <guijianfeng@...fujitsu.com>
To:	Vlad Yasevich <vladislav.yasevich@...com>
CC:	David Miller <davem@...emloft.net>, linux-sctp@...r.kernel.org,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] SCTP: enable cookie-echo retransmission transport switch

Vlad,

  Thanks for your comments.

Vlad Yasevich wrote:
> Gui Jianfeng wrote:
>> Vlad,
>> This patch enables cookie-echo retransmission transport switch
>> feature. If COOKIE-ECHO retransmission happens, it will be sent to the
>> address other than the one last sent to.
>>
> 
> NAK.
> 
> You can't blindly choose a different transport since they could
> be unconfirmed and can't really be used until we confirm them
> with HBs.  So, you can only do this when the user issued an
> sctp_connectx() and we have multiple confirmed transports.
> 
> In this case only confirmed transports are allowed, otherwise
> there is a possibility of hijacking associations.
> 
  Choosing a transport here just gives a suggestion for sctp_outq_flush(),
  sctp_outq_flush() will judge again. If the selected transport is in 
  INACTIVE or UNCONFIRMED, active_path will be used.
  So COOKIE-ECHO won't be sent to a unconfirmed address.

> 
> Also, looking at this, the same problem exists in current
> code for selection INIT transports.
> 
> We don't correctly treat peers passed to connectx() as confirmed
> and don't select the correct transport.
> 
> Once you fix that above, you can just re-use the function and
> re-use init_last_sent_to.

  Will do.

> 
> -vlad
> 



> 
> 

-- 
Regards
Gui Jianfeng
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