Re: [RFC PATCH net] sctp: ASCONF-ACK with Unresolvable Address should be sent

[lucien xin <lucien.xin@gmail.com>]

On Mon, Jul 27, 2015 at 9:44 PM, Marcelo Ricardo Leitner
<marcelo.leitner@gmail.com> wrote:
> On Sat, Jul 25, 2015 at 01:08:08PM +0800, Xin Long wrote:
>> RFC 5061:
>>     This is an opaque integer assigned by the sender to identify each
>>     request parameter.  The receiver of the ASCONF Chunk will copy this
>>     32-bit value into the ASCONF Response Correlation ID field of the
>>     ASCONF-ACK response parameter.  The sender of the ASCONF can use this
>>     same value in the ASCONF-ACK to find which request the response is
>>     for.  Note that the receiver MUST NOT change this 32-bit value.
>>
>>     Address Parameter: TLV
>>
>>     This field contains an IPv4 or IPv6 address parameter, as described
>>     in Section 3.3.2.1 of [RFC4960].
>>
>> ASCONF chunk with Error Cause Indication Parameter (Unresolvable Address)
>> should be sent if the Delete IP Address is not part of the association.
>>
>>   Endpoint A                           Endpoint B
>>   (ESTABLISHED)                        (ESTABLISHED)
>>
>>   ASCONF        ----------------->
>>   (Delete IP Address)
>>                 <-----------------      ASCONF-ACK
>>                                         (Unresolvable Address)
>>
>> Signed-off-by: Xin Long <lucien.xin@gmail.com>
>> ---
>>  net/sctp/sm_make_chunk.c | 15 +++++++++++++--
>>  1 file changed, 13 insertions(+), 2 deletions(-)
>>
>> diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
>> index 06320c8..6e399f6 100644
>> --- a/net/sctp/sm_make_chunk.c
>> +++ b/net/sctp/sm_make_chunk.c
>> @@ -3090,8 +3090,19 @@ static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
>>                       sctp_assoc_set_primary(asoc, asconf->transport);
>>                       sctp_assoc_del_nonprimary_peers(asoc,
>>                                                       asconf->transport);
>> -             } else
>> -                     sctp_assoc_del_peer(asoc, &addr);
>> +                     return SCTP_ERROR_NO_ERROR;
>> +             }
>> +
>> +             /* If the address is not part of the association, the
>> +              * ASCONF-ACK with Error Cause Indication Parameter
>> +              * which including cause of Unresolvable Address should
>> +              * be sent.
>> +              */
>> +             peer = sctp_assoc_lookup_paddr(asoc, &addr);
>> +             if (!peer)
>> +                     return SCTP_ERROR_DNS_FAILED;
>> +
>> +             sctp_assoc_rm_peer(asoc, peer);
>>               break;
>>       case SCTP_PARAM_SET_PRIMARY:
>>               /* ADDIP Section 4.2.4
>> --
>> 2.1.0
>>
>
> Looks good to me.
>
>   Marcelo
>

any update for this one? is it accepted?