lksctp-tools:sctp_test fails when not using sock_stream

lksctp-tools:sctp_test fails when not using sock_stream

[kunapaneni prashanth]

Hi,
 in our setup, i am trying out sctp tests using lksctp tools between
two hosts connected back to back.

H1(5.5.5.8)  --------------   H2 (5.5.5.5)


following are the commands i used.

Case 1:
====client:
sctp_test -H 5.5.5.8 -P 24241 -h 5.5.5.5 -p 24240 -s

server:
sctp_test -h 5.5.5.8 -p 24241 -H 5.5.5.5 -P 24240 -l


This test case fails, with client sending a abort after INIT/INIT-ACK.

If i run same test case with "-T" option, it is successful.

i,e
Case 2:
====
client:
sctp_test -H 5.5.5.8 -P 24241 -h 5.5.5.5 -p 24240 -s -T

server:
sctp_test -h 5.5.5.8 -p 24241 -H 5.5.5.5 -P 24240 -l




i observed that in case 1, sctp_test never calls "connect", why is it
so? shouldnt a connect be called.


I modified the code as follows to make sure a connect is issued. After
this everything works fine.

Please confirm.

1386c1386
<         if (socket_type = SOCK_STREAM || connectx_count = 0)
---
>         if (socket_type = SOCK_STREAM && connectx_count = 0)



Thank you,
Prashanth

Re: lksctp-tools:sctp_test fails when not using sock_stream

[Marcelo Ricardo Leitner]

On Wed, Sep 09, 2015 at 01:43:01PM +0530, kunapaneni prashanth wrote:
> Hi,
>  in our setup, i am trying out sctp tests using lksctp tools between
> two hosts connected back to back.
> 
> H1(5.5.5.8)  --------------   H2 (5.5.5.5)
> 
> 
> following are the commands i used.
> 
> Case 1:
> ====> client:
> sctp_test -H 5.5.5.8 -P 24241 -h 5.5.5.5 -p 24240 -s
> 
> server:
> sctp_test -h 5.5.5.8 -p 24241 -H 5.5.5.5 -P 24240 -l
> 
> 
> This test case fails, with client sending a abort after INIT/INIT-ACK.
> 
> If i run same test case with "-T" option, it is successful.
> 
> i,e
> Case 2:
> ====
> client:
> sctp_test -H 5.5.5.8 -P 24241 -h 5.5.5.5 -p 24240 -s -T
> 
> server:
> sctp_test -h 5.5.5.8 -p 24241 -H 5.5.5.5 -P 24240 -l
> 
> 
> 
> 
> i observed that in case 1, sctp_test never calls "connect", why is it
> so? shouldnt a connect be called.

It's not really necessary, specially when not using -T option. sendmsg()
can specify the destination too.

I cannot reproduce your issue here.  You can check with strace if
sendmsg() parameters are really there and so.

  Marcelo

Re: lksctp-tools:sctp_test fails when not using sock_stream

[Vlad Yasevich]

On 09/09/2015 04:13 AM, kunapaneni prashanth wrote:
> Hi,
>  in our setup, i am trying out sctp tests using lksctp tools between
> two hosts connected back to back.
> 
> H1(5.5.5.8)  --------------   H2 (5.5.5.5)
> 
> 
> following are the commands i used.
> 
> Case 1:
> ====> client:
> sctp_test -H 5.5.5.8 -P 24241 -h 5.5.5.5 -p 24240 -s
> 
> server:
> sctp_test -h 5.5.5.8 -p 24241 -H 5.5.5.5 -P 24240 -l
> 
> 
> This test case fails, with client sending a abort after INIT/INIT-ACK.
> 
> If i run same test case with "-T" option, it is successful.

The test runs fine in my environment.  Which kernel are you using?

> 
> i,e
> Case 2:
> ====
> client:
> sctp_test -H 5.5.5.8 -P 24241 -h 5.5.5.5 -p 24240 -s -T
> 
> server:
> sctp_test -h 5.5.5.8 -p 24241 -H 5.5.5.5 -P 24240 -l
> 
> 
> 
> 
> i observed that in case 1, sctp_test never calls "connect", why is it
> so? shouldnt a connect be called.
> 

No, the connect is not required when using SOCK_SEQPACKET sockets and
that is what the test tries to do.  Forcing it to always connect isn't
the right thing.  You need to figure our why you are getting an ABORT.

-vlad

>
> 
> I modified the code as follows to make sure a connect is issued. After
> this everything works fine.
> 
> Please confirm.
> 
> 1386c1386
> <         if (socket_type = SOCK_STREAM || connectx_count = 0)
> ---
>>         if (socket_type = SOCK_STREAM && connectx_count = 0)
> 
> 


> Thank you,
> Prashanth
> --
> To unsubscribe from this list: send the line "unsubscribe linux-sctp" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

Re: lksctp-tools:sctp_test fails when not using sock_stream

[kunapaneni prashanth]

Hi Vlad/Marcelo,
 Thank you for the response.

 I am using kernel 3.10.0-123.20.1.el7.x86_64.

 I should give bit more details about my setup. My hosts H1 and H2 use
special ethernet adapters which run openvswitch. Due to this, i
believe there is initially bit more latency when connection is being
established. I checked the packets and packets are delivered to other
side without any errors.

 i am new to sctp, so i am not exactly sure how kernel part of sctp works.

While testing case 1 mentioned in my previous mail.

In Server side i see following:
==========
[root@localhost tmp]# sctp_test -h 5.5.5.8 -p 24241 -H 5.5.5.5 -P 24240 -l

remote:addr=5.5.5.8, port$241, family=2
local:addr=5.5.5.5, port$240, family=2
seed = 1441868236

Starting tests...
    socket(SOCK_SEQPACKET, IPPROTO_SCTP)  ->  sk=3
    bind(sk=3, [a:5.5.5.5,p:24240])  --  attempt 1/10
    listen(sk=3,backlog\x100)
Server: Receiving packets.
    recvmsg(sk=3)

Notification: SCTP_ASSOC_CHANGE(COMMUNICATION_UP)
        (assoc_change: state=0, error=0, instr\x10 outstr\x10)
    recvmsg(sk=3) Data 1 bytes. First 1 bytes: <empty> text[0]=0
    recvmsg(sk=3) Notification: SCTP_ASSOC_CHANGE(COMMUNICATION_LOST)
        (assoc_change: state=1, error=0, instr=0 outstr=0)
    recvmsg(sk=3)


TCPDUMP on Server side
-------------------------------------

[root@localhost tmp]# tcpdump -i oct0
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on oct0, link-type EN10MB (Ethernet), capture size 65535 bytes
12:33:57.134221 IP 5.5.5.8.24241 > 5.5.5.5.24240: sctp (1) [INIT]
[init tag: 3460584308] [rwnd: 106496] [OS: 10] [MIS: 65535] [init TSN:
2697986036]
12:33:57.135112 IP 5.5.5.5.24240 > 5.5.5.8.24241: sctp (1) [INIT ACK]
[init tag: 3286358519] [rwnd: 106496] [OS: 10] [MIS: 10] [init TSN:
942498333]
12:33:57.135702 IP 5.5.5.8.24241 > 5.5.5.5.24240: sctp (1) [COOKIE
ECHO] , (2) [DATA] (U)(B)(E) [TSN: 2697986036] [SID: 0] [SSEQ 0] [PPID
0x122c861b]
12:33:57.136079 IP 5.5.5.5.24240 > 5.5.5.8.24241: sctp (1) [COOKIE
ACK] , (2) [SACK] [cum ack 2697986036] [a_rwnd 106495] [#gap acks 0]
[#dup tsns 0]
12:33:57.136415 IP 5.5.5.8.24241 > 5.5.5.5.24240: sctp (1) [ABORT]






I  am assuming below is the sequence in Client side.
================== when using "sctp_test -h 5.5.5.8 -p 24241 -H 5.5.5.5 -P 24240 -l"

1. sctp_test calls sendmsg.
2. Kernel initiates a handshake.
3. sctp_test sends all the packets and closes the socket before
handshake is complete.
4. Kernel sends a abort packet due to socket close without completing
the transfer of packets.


Just to confirm if above theory is correct, i increased the number of
packets to be sent by sctp_test using following command.

"sctp_test -H 5.5.5.8 -P 24241 -h 5.5.5.5 -p 24240 -s -x 30"

I assume in this case, since sctp_test takes more time to send all the
packets, kernel has enough time to complete the handshake.

This test passed always.

 so is the theory that sctp_test is closing socket  too fast  correct?

 if so, shouldn't the kernel complete the connection initiation,
transfer packet before closing the connection even when socket close
is called too fast.

Thanks,
Prashanth


On Thu, Sep 10, 2015 at 2:49 AM, Vlad Yasevich <vyasevich@gmail.com> wrote:
> On 09/09/2015 04:13 AM, kunapaneni prashanth wrote:
>> Hi,
>>  in our setup, i am trying out sctp tests using lksctp tools between
>> two hosts connected back to back.
>>
>> H1(5.5.5.8)  --------------   H2 (5.5.5.5)
>>
>>
>> following are the commands i used.
>>
>> Case 1:
>> ====>> client:
>> sctp_test -H 5.5.5.8 -P 24241 -h 5.5.5.5 -p 24240 -s
>>
>> server:
>> sctp_test -h 5.5.5.8 -p 24241 -H 5.5.5.5 -P 24240 -l
>>
>>
>> This test case fails, with client sending a abort after INIT/INIT-ACK.
>>
>> If i run same test case with "-T" option, it is successful.
>
> The test runs fine in my environment.  Which kernel are you using?
>
>>
>> i,e
>> Case 2:
>> ====
>> client:
>> sctp_test -H 5.5.5.8 -P 24241 -h 5.5.5.5 -p 24240 -s -T
>>
>> server:
>> sctp_test -h 5.5.5.8 -p 24241 -H 5.5.5.5 -P 24240 -l
>>
>>
>>
>>
>> i observed that in case 1, sctp_test never calls "connect", why is it
>> so? shouldnt a connect be called.
>>
>
> No, the connect is not required when using SOCK_SEQPACKET sockets and
> that is what the test tries to do.  Forcing it to always connect isn't
> the right thing.  You need to figure our why you are getting an ABORT.
>
> -vlad
>
>>
>>
>> I modified the code as follows to make sure a connect is issued. After
>> this everything works fine.
>>
>> Please confirm.
>>
>> 1386c1386
>> <         if (socket_type = SOCK_STREAM || connectx_count = 0)
>> ---
>>>         if (socket_type = SOCK_STREAM && connectx_count = 0)
>>
>>
>
>
>> Thank you,
>> Prashanth
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-sctp" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>
>

Re: lksctp-tools:sctp_test fails when not using sock_stream

[Vlad Yasevich]

On 09/10/2015 03:07 AM, kunapaneni prashanth wrote:
> Hi Vlad/Marcelo,
>  Thank you for the response.
> 
>  I am using kernel 3.10.0-123.20.1.el7.x86_64.
> 
>  I should give bit more details about my setup. My hosts H1 and H2 use
> special ethernet adapters which run openvswitch. Due to this, i
> believe there is initially bit more latency when connection is being
> established. I checked the packets and packets are delivered to other
> side without any errors.
> 
>  i am new to sctp, so i am not exactly sure how kernel part of sctp works.
> 
> While testing case 1 mentioned in my previous mail.
> 
> In Server side i see following:
> ==========> 
> [root@localhost tmp]# sctp_test -h 5.5.5.8 -p 24241 -H 5.5.5.5 -P 24240 -l
> 
> remote:addr=5.5.5.8, port$241, family=2
> local:addr=5.5.5.5, port$240, family=2
> seed = 1441868236
> 
> Starting tests...
>     socket(SOCK_SEQPACKET, IPPROTO_SCTP)  ->  sk=3
>     bind(sk=3, [a:5.5.5.5,p:24240])  --  attempt 1/10
>     listen(sk=3,backlog\x100)
> Server: Receiving packets.
>     recvmsg(sk=3)
> 
> Notification: SCTP_ASSOC_CHANGE(COMMUNICATION_UP)
>         (assoc_change: state=0, error=0, instr\x10 outstr\x10)
>     recvmsg(sk=3) Data 1 bytes. First 1 bytes: <empty> text[0]=0
>     recvmsg(sk=3) Notification: SCTP_ASSOC_CHANGE(COMMUNICATION_LOST)
>         (assoc_change: state=1, error=0, instr=0 outstr=0)
>     recvmsg(sk=3)
> 

Could you also provide the client side output as well..

Thanks
-vlad


> 
> TCPDUMP on Server side
> -------------------------------------
> 
> [root@localhost tmp]# tcpdump -i oct0
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on oct0, link-type EN10MB (Ethernet), capture size 65535 bytes
> 12:33:57.134221 IP 5.5.5.8.24241 > 5.5.5.5.24240: sctp (1) [INIT]
> [init tag: 3460584308] [rwnd: 106496] [OS: 10] [MIS: 65535] [init TSN:
> 2697986036]
> 12:33:57.135112 IP 5.5.5.5.24240 > 5.5.5.8.24241: sctp (1) [INIT ACK]
> [init tag: 3286358519] [rwnd: 106496] [OS: 10] [MIS: 10] [init TSN:
> 942498333]
> 12:33:57.135702 IP 5.5.5.8.24241 > 5.5.5.5.24240: sctp (1) [COOKIE
> ECHO] , (2) [DATA] (U)(B)(E) [TSN: 2697986036] [SID: 0] [SSEQ 0] [PPID
> 0x122c861b]
> 12:33:57.136079 IP 5.5.5.5.24240 > 5.5.5.8.24241: sctp (1) [COOKIE
> ACK] , (2) [SACK] [cum ack 2697986036] [a_rwnd 106495] [#gap acks 0]
> [#dup tsns 0]
> 12:33:57.136415 IP 5.5.5.8.24241 > 5.5.5.5.24240: sctp (1) [ABORT]
> 
> 
> 
> 
> 
> 
> I  am assuming below is the sequence in Client side.
> ==================>  when using "sctp_test -h 5.5.5.8 -p 24241 -H 5.5.5.5 -P 24240 -l"
> 
> 1. sctp_test calls sendmsg.
> 2. Kernel initiates a handshake.
> 3. sctp_test sends all the packets and closes the socket before
> handshake is complete.
> 4. Kernel sends a abort packet due to socket close without completing
> the transfer of packets.
> 
> 
> Just to confirm if above theory is correct, i increased the number of
> packets to be sent by sctp_test using following command.
> 
> "sctp_test -H 5.5.5.8 -P 24241 -h 5.5.5.5 -p 24240 -s -x 30"
> 
> I assume in this case, since sctp_test takes more time to send all the
> packets, kernel has enough time to complete the handshake.
> 
> This test passed always.
> 
>  so is the theory that sctp_test is closing socket  too fast  correct?
> 
>  if so, shouldn't the kernel complete the connection initiation,
> transfer packet before closing the connection even when socket close
> is called too fast.
> 
> Thanks,
> Prashanth
> 
> 
> On Thu, Sep 10, 2015 at 2:49 AM, Vlad Yasevich <vyasevich@gmail.com> wrote:
>> On 09/09/2015 04:13 AM, kunapaneni prashanth wrote:
>>> Hi,
>>>  in our setup, i am trying out sctp tests using lksctp tools between
>>> two hosts connected back to back.
>>>
>>> H1(5.5.5.8)  --------------   H2 (5.5.5.5)
>>>
>>>
>>> following are the commands i used.
>>>
>>> Case 1:
>>> ====>>> client:
>>> sctp_test -H 5.5.5.8 -P 24241 -h 5.5.5.5 -p 24240 -s
>>>
>>> server:
>>> sctp_test -h 5.5.5.8 -p 24241 -H 5.5.5.5 -P 24240 -l
>>>
>>>
>>> This test case fails, with client sending a abort after INIT/INIT-ACK.
>>>
>>> If i run same test case with "-T" option, it is successful.
>>
>> The test runs fine in my environment.  Which kernel are you using?
>>
>>>
>>> i,e
>>> Case 2:
>>> ====
>>> client:
>>> sctp_test -H 5.5.5.8 -P 24241 -h 5.5.5.5 -p 24240 -s -T
>>>
>>> server:
>>> sctp_test -h 5.5.5.8 -p 24241 -H 5.5.5.5 -P 24240 -l
>>>
>>>
>>>
>>>
>>> i observed that in case 1, sctp_test never calls "connect", why is it
>>> so? shouldnt a connect be called.
>>>
>>
>> No, the connect is not required when using SOCK_SEQPACKET sockets and
>> that is what the test tries to do.  Forcing it to always connect isn't
>> the right thing.  You need to figure our why you are getting an ABORT.
>>
>> -vlad
>>
>>>
>>>
>>> I modified the code as follows to make sure a connect is issued. After
>>> this everything works fine.
>>>
>>> Please confirm.
>>>
>>> 1386c1386
>>> <         if (socket_type = SOCK_STREAM || connectx_count = 0)
>>> ---
>>>>         if (socket_type = SOCK_STREAM && connectx_count = 0)
>>>
>>>
>>
>>
>>> Thank you,
>>> Prashanth
>>> --
>>> To unsubscribe from this list: send the line "unsubscribe linux-sctp" in
>>> the body of a message to majordomo@vger.kernel.org
>>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>>
>>

Re: lksctp-tools:sctp_test fails when not using sock_stream

[kunapaneni prashanth]

Hi Vlad,
 Client side output is as follows

sctp_test -H 5.5.5.8 -P 24241 -h 5.5.5.5 -p 24240 -s -d 2
remote:addr=5.5.5.5, port$240, family=2
local:addr=5.5.5.8, port$241, family=2
seed = 1441869106

Starting tests...
    socket(SOCK_SEQPACKET, IPPROTO_SCTP)  ->  sk=3
    bind(sk=3, [a:5.5.5.8,p:24241])  --  attempt 1/10

Client: Sending packets.(1/10)
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1710682300
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1765869275
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid„9299205
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidw5923576
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1177005326
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidX0481799
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1820434279
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid“1838640
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1163854356
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidw0096763
Client: Sending packets.(2/10)
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid#513767
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1224970862
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidr1236614
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidq4480381
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1547270326
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1717490031
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1160620866
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid‡2101
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidh0567177
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1437630606
Client: Sending packets.(3/10)
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x125273689
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1035787573
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1035963077
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x186752879
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1279859637
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1262253125
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid“0828640
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid™2036574
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1016073615
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1104261184
Client: Sending packets.(4/10)
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1277931395
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidW9272267
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidr2646812
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid!27230601
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1355195843
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1899652138
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidV0228752
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1028146475
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidh4007130
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1724083108
Client: Sending packets.(5/10)
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1798243238
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidp7520898
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid€1570323
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid71996205
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1422001279
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid 1357001
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid 89486236
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidC5138498
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid 2229103
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidb2569765
Client: Sending packets.(6/10)
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1872769104
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid27502792
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1658357338
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidv1248533
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidQ4255671
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidy0733327
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid 23501659
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1445084311
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1782769901
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid‰2091626
Client: Sending packets.(7/10)
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid@1861848
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid‘3217648
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1471363893
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1124508660
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid‰2964601
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidg9076089
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid‡6677150
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1453193353
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1707222564
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1560684280
Client: Sending packets.(8/10)
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1029792814
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1357982154
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x120721530
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1831363137
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1729978359
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1542722810
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid 32720138
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1671980947
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1977861308
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid‡465593
Client: Sending packets.(9/10)
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x147067064
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1703146764
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidA4968385
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1805424402
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid16911650
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid’9224056
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidD8674081
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x192929661
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid"6824720
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidƒ960334
Client: Sending packets.(10/10)
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1085021287
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidb8686568
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid™7177983
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid@8901532
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1753195228
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1890142584
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1087977621
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidH2388730
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppid\x1195852290
    sendmsg(sk=3, assoc=0)    1 bytes.
      SNDRCV(stream=0 flags=0x1 ppidd7716537
    close(sk=3)


Thank you,
Prashanth

On Tue, Sep 15, 2015 at 11:40 PM, Vlad Yasevich <vyasevich@gmail.com> wrote:
> On 09/10/2015 03:07 AM, kunapaneni prashanth wrote:
>> Hi Vlad/Marcelo,
>>  Thank you for the response.
>>
>>  I am using kernel 3.10.0-123.20.1.el7.x86_64.
>>
>>  I should give bit more details about my setup. My hosts H1 and H2 use
>> special ethernet adapters which run openvswitch. Due to this, i
>> believe there is initially bit more latency when connection is being
>> established. I checked the packets and packets are delivered to other
>> side without any errors.
>>
>>  i am new to sctp, so i am not exactly sure how kernel part of sctp works.
>>
>> While testing case 1 mentioned in my previous mail.
>>
>> In Server side i see following:
>> ==========>>
>> [root@localhost tmp]# sctp_test -h 5.5.5.8 -p 24241 -H 5.5.5.5 -P 24240 -l
>>
>> remote:addr=5.5.5.8, port$241, family=2
>> local:addr=5.5.5.5, port$240, family=2
>> seed = 1441868236
>>
>> Starting tests...
>>     socket(SOCK_SEQPACKET, IPPROTO_SCTP)  ->  sk=3
>>     bind(sk=3, [a:5.5.5.5,p:24240])  --  attempt 1/10
>>     listen(sk=3,backlog\x100)
>> Server: Receiving packets.
>>     recvmsg(sk=3)
>>
>> Notification: SCTP_ASSOC_CHANGE(COMMUNICATION_UP)
>>         (assoc_change: state=0, error=0, instr\x10 outstr\x10)
>>     recvmsg(sk=3) Data 1 bytes. First 1 bytes: <empty> text[0]=0
>>     recvmsg(sk=3) Notification: SCTP_ASSOC_CHANGE(COMMUNICATION_LOST)
>>         (assoc_change: state=1, error=0, instr=0 outstr=0)
>>     recvmsg(sk=3)
>>
>
> Could you also provide the client side output as well..
>
> Thanks
> -vlad
>
>
>>
>> TCPDUMP on Server side
>> -------------------------------------
>>
>> [root@localhost tmp]# tcpdump -i oct0
>> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
>> listening on oct0, link-type EN10MB (Ethernet), capture size 65535 bytes
>> 12:33:57.134221 IP 5.5.5.8.24241 > 5.5.5.5.24240: sctp (1) [INIT]
>> [init tag: 3460584308] [rwnd: 106496] [OS: 10] [MIS: 65535] [init TSN:
>> 2697986036]
>> 12:33:57.135112 IP 5.5.5.5.24240 > 5.5.5.8.24241: sctp (1) [INIT ACK]
>> [init tag: 3286358519] [rwnd: 106496] [OS: 10] [MIS: 10] [init TSN:
>> 942498333]
>> 12:33:57.135702 IP 5.5.5.8.24241 > 5.5.5.5.24240: sctp (1) [COOKIE
>> ECHO] , (2) [DATA] (U)(B)(E) [TSN: 2697986036] [SID: 0] [SSEQ 0] [PPID
>> 0x122c861b]
>> 12:33:57.136079 IP 5.5.5.5.24240 > 5.5.5.8.24241: sctp (1) [COOKIE
>> ACK] , (2) [SACK] [cum ack 2697986036] [a_rwnd 106495] [#gap acks 0]
>> [#dup tsns 0]
>> 12:33:57.136415 IP 5.5.5.8.24241 > 5.5.5.5.24240: sctp (1) [ABORT]
>>
>>
>>
>>
>>
>>
>> I  am assuming below is the sequence in Client side.
>> ==================>>  when using "sctp_test -h 5.5.5.8 -p 24241 -H 5.5.5.5 -P 24240 -l"
>>
>> 1. sctp_test calls sendmsg.
>> 2. Kernel initiates a handshake.
>> 3. sctp_test sends all the packets and closes the socket before
>> handshake is complete.
>> 4. Kernel sends a abort packet due to socket close without completing
>> the transfer of packets.
>>
>>
>> Just to confirm if above theory is correct, i increased the number of
>> packets to be sent by sctp_test using following command.
>>
>> "sctp_test -H 5.5.5.8 -P 24241 -h 5.5.5.5 -p 24240 -s -x 30"
>>
>> I assume in this case, since sctp_test takes more time to send all the
>> packets, kernel has enough time to complete the handshake.
>>
>> This test passed always.
>>
>>  so is the theory that sctp_test is closing socket  too fast  correct?
>>
>>  if so, shouldn't the kernel complete the connection initiation,
>> transfer packet before closing the connection even when socket close
>> is called too fast.
>>
>> Thanks,
>> Prashanth
>>
>>
>> On Thu, Sep 10, 2015 at 2:49 AM, Vlad Yasevich <vyasevich@gmail.com> wrote:
>>> On 09/09/2015 04:13 AM, kunapaneni prashanth wrote:
>>>> Hi,
>>>>  in our setup, i am trying out sctp tests using lksctp tools between
>>>> two hosts connected back to back.
>>>>
>>>> H1(5.5.5.8)  --------------   H2 (5.5.5.5)
>>>>
>>>>
>>>> following are the commands i used.
>>>>
>>>> Case 1:
>>>> ====>>>> client:
>>>> sctp_test -H 5.5.5.8 -P 24241 -h 5.5.5.5 -p 24240 -s
>>>>
>>>> server:
>>>> sctp_test -h 5.5.5.8 -p 24241 -H 5.5.5.5 -P 24240 -l
>>>>
>>>>
>>>> This test case fails, with client sending a abort after INIT/INIT-ACK.
>>>>
>>>> If i run same test case with "-T" option, it is successful.
>>>
>>> The test runs fine in my environment.  Which kernel are you using?
>>>
>>>>
>>>> i,e
>>>> Case 2:
>>>> ====
>>>> client:
>>>> sctp_test -H 5.5.5.8 -P 24241 -h 5.5.5.5 -p 24240 -s -T
>>>>
>>>> server:
>>>> sctp_test -h 5.5.5.8 -p 24241 -H 5.5.5.5 -P 24240 -l
>>>>
>>>>
>>>>
>>>>
>>>> i observed that in case 1, sctp_test never calls "connect", why is it
>>>> so? shouldnt a connect be called.
>>>>
>>>
>>> No, the connect is not required when using SOCK_SEQPACKET sockets and
>>> that is what the test tries to do.  Forcing it to always connect isn't
>>> the right thing.  You need to figure our why you are getting an ABORT.
>>>
>>> -vlad
>>>
>>>>
>>>>
>>>> I modified the code as follows to make sure a connect is issued. After
>>>> this everything works fine.
>>>>
>>>> Please confirm.
>>>>
>>>> 1386c1386
>>>> <         if (socket_type = SOCK_STREAM || connectx_count = 0)
>>>> ---
>>>>>         if (socket_type = SOCK_STREAM && connectx_count = 0)
>>>>
>>>>
>>>
>>>
>>>> Thank you,
>>>> Prashanth
>>>> --
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>>>>
>>>
>