netdev - Re: [PATCH net-next-2.6 v2 3/3] sctp: Add a valid address list in association local

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Message-Id: <31E97136-286D-4EC3-BE6B-7A35B0973EF7@sfc.wide.ad.jp>
Date:	Thu, 14 Apr 2011 11:28:58 +0900
From:	Michio Honda <micchie@....wide.ad.jp>
To:	Wei Yongjun <yjwei@...fujitsu.com>
Cc:	netdev@...r.kernel.org, lksctp-developers@...ts.sourceforge.net
Subject: Re: [PATCH net-next-2.6 v2 3/3] sctp: Add a valid address list in association local

Ah, OK, if so, this patch is unnecessary.  
Sorry for missing to read the code.  

Thanks,
- Michio

On Apr 14, 2011, at 11:24 , Wei Yongjun wrote:

> 
>> Hi, 
>> 
>> I implemented that functionality for following situations.  
>> 1. Suppose two associations A and B directed to different destination that belong to the same endpoint.  (one-to-many socket).  
> 
> Yes, but the addr list of assoc A and B is independent, see
> asoc->base.bind_addr, which is per asoc.
> 
> endpoint hold the bind list for new create assoc. when assoc
> is created, the bind list will be copy from ep, by
> sctp_assoc_set_bind_addr_from_ep().
> 
>> 2. After the address addition event, A and B will send an ASCONF.  
>> 3. Suppose only A receives ASCONF-ACK, and B has not received one yet.  
>> 4. In this moment, A can use the new address as the source address for regular chunk, but B can't.  
>> 5. But I think both A and B use the new address even after only A receives ASCONF-ACK  in current SCTP implementation,
>> This patch achieves that only A uses that new address in this moment.  
>> 
>> Am I missing something?
>> 
>> Thanks,
>> - Michio
>> 
>> On Apr 14, 2011, at 10:33 , Wei Yongjun wrote:
>> 
>>> 
>>>> When the SCTP association transmits an ASCONF with ADD_IP_ADDRESS, that association cannot use the adding address until it receives ASCONF-ACK.  
>>>> This patch prevents that associations that do not receive ASCONF-ACK use the adding address.
>>> The new adding address is marked SCTP_ADDR_NEW, and cannot use
>>> in LKSCTP until received ASCONF-ACK and marked as SCTP_ADDR_SRC.
>>> So, add this valid address list is unnecessary.
>>> 
>>> I guess you want to fix the route lookup issue?
>>> 
>>> If it is, the only thing we need to fix is the lookup of route. If we can not
>>> found a valid dst for transport, we can try address marked with SCTP_ADDR_NEW.
>>> 
>>> 
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