netdev - Re: [PATCH 6/6 v8] sctp: Add ASCONF operation on the single-homed host

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Message-Id: <5183C2C0-C377-4FF7-89A1-3F19D53FBBBF@sfc.wide.ad.jp>
Date:	Thu, 28 Apr 2011 17:04:18 +0900
From:	Michio Honda <micchie@....wide.ad.jp>
To:	Wei Yongjun <yjwei@...fujitsu.com>
Cc:	netdev@...r.kernel.org, YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Subject: Re: [PATCH 6/6 v8] sctp: Add ASCONF operation on the single-homed host

>> 
>>>> +			/* reuse the parameter length from the same scope one */
>>>> +			totallen += paramlen;
>>>> +			totallen += addr_param_len;
>>>> +			del_pickup = 1;
>>>> +			asoc->src_out_of_asoc_ok = 1;
>>> src_out_of_asoc_ok should be marked when the last address is
>>> assigned to asoc->asconf_addr_del_pending?
>> I thought marking src_out_of_asoc_ok should be set when the candidate new address appears, rather than when the last address is being deleted.  
>> Because until such address appears, there is no situation to send any chunk from the address not in the association.  
> 
> The last address have been marked as DEL, will never using
> for sending chunks. At this time, there is no valid address in the
> host, chunk can not be send out by host.
I understand that, marking out_of_asoc_ok at the last address being deleted does same thing.  
However, out_of_asoc_ok state is not regular, so I think we should shorten that duration as much as possible.  
But this is my personal opinion, so if you don't think so, I will mark it when the last address being deleted.  
> 
>>>> +			SCTP_DEBUG_PRINTK("mkasconf_update_ip: picked same-scope del_pending addr, totallen for all addresses is %d\n", totallen);
>>>> +		}
>>>> 	}
>>>> 
>>>> 	/* Create an asconf chunk with the required length. */
>>>> @@ -2802,6 +2819,19 @@ struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
>>>> 
>>>> 		addr_buf += af->sockaddr_len;
>>>> 	}
>>>> +	if (flags == SCTP_PARAM_ADD_IP && del_pickup) {
>>>> +		addr = asoc->asconf_addr_del_pending;
>>>> +		del_af = sctp_get_af_specific(addr->v4.sin_family);
>>>> +		del_addr_param_len = del_af->to_addr_param(addr,
>>>> +		    &del_addr_param);
>>>> +		del_param.param_hdr.type = SCTP_PARAM_DEL_IP;
>>>> +		del_param.param_hdr.length = htons(del_paramlen +
>>>> +		    del_addr_param_len);
>>>> +		del_param.crr_id = i;
>>>> +
>>>> +		sctp_addto_chunk(retval, del_paramlen, &del_param);
>>>> +		sctp_addto_chunk(retval, del_addr_param_len, &del_addr_param);
>>>> +	}
>>>> 	return retval;
>>>> }
>>> How about clean up this part as:
>>> 
>>> +       if (...) {
>>> +               addr = asoc->asconf_addr_del_pending;
>>> +               af = sctp_get_af_specific(addr->v4.sin_family);
>>> +               addr_param_len = af->to_addr_param(addr, &addr_param);
>>> +               totallen += paramlen;
>>> +               totallen += addr_param_len;
>>> +		...
>>> +       }
>>> +
>>>      /* Create an asconf chunk with the required length. */
>>>      retval = sctp_make_asconf(asoc, laddr, totallen);
>>>      if (!retval)
>>> @@ -2802,6 +2812,18 @@ struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
>>> 
>>>              addr_buf += af->sockaddr_len;
>>>      }
>>> +
>>> +       if (...) {
>>> +               addr = asoc->asconf_addr_del_pending;
>>> +               af = sctp_get_af_specific(addr->v4.sin_family);
>>> +               addr_param_len = af->to_addr_param(addr, &addr_param);
>>> +               param.param_hdr.type = SCTP_PARAM_DEL_IP;
>>> +               param.param_hdr.length = htons(paramlen + addr_param_len);
>>> +               param.crr_id = i;
>>> +
>>> +               sctp_addto_chunk(retval, paramlen, &param);
>>> +               sctp_addto_chunk(retval, addr_param_len, &addr_param);
>>> +       }
>> agreed with reusing af instead of defining del_af.  
>> --
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