netdev - Re: [PATCHv2 net-next] sctp: sctp should change socket state when shutdown is received

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Date:	Wed, 8 Jun 2016 09:05:58 -0300
From:	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:	Xin Long <lucien.xin@...il.com>
Cc:	network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org,
	Vlad Yasevich <vyasevich@...il.com>, daniel@...earbox.net,
	davem <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCHv2 net-next] sctp: sctp should change socket state when
 shutdown is received

Em 08-06-2016 07:42, Xin Long escreveu:
> On Tue, Jun 7, 2016 at 7:03 PM, Xin Long <lucien.xin@...il.com> wrote:
>> On Sat, Jun 4, 2016 at 8:22 PM, Marcelo Ricardo Leitner
>>
>> --- a/net/sctp/socket.c
>> +++ b/net/sctp/socket.c
>> @@ -7565,10 +7565,12 @@ static void sctp_sock_migrate(struct sock
>> *oldsk, struct sock *newsk,
>>         /* If the association on the newsk is already closed before accept()
>>          * is called, set RCV_SHUTDOWN flag.
>>          */
>> -       if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
>> +       if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
>> +               newsk->sk_state = SCTP_SS_CLOSING;
>>                 newsk->sk_shutdown |= RCV_SHUTDOWN;
>> +       } else
>> +               newsk->sk_state = SCTP_SS_ESTABLISHED;
>>
>> -       newsk->sk_state = SCTP_SS_ESTABLISHED;
>>
> I'm still thinking about this, if we want to get addrs info from
> closed assoc, like Adam's requirement. this will make it more
> impossible.
>
> case in
> sctp_getsockopt_peer_addrs()->sctp_id2assoc():
>
>                 if (!sctp_sstate(sk, ESTABLISHED))
>                         return NULL;
>
> we can't  get assoc as sstate is SS_CLOSING already.
>

We probably can add another state to that if(). So far ESTABLISHED was 
the only reasonable state in there, but SS_CLOSING will make sense too 
then, I guess. A throughout check is necessary for this.

   Marcelo