Re: [Lksctp-developers] lksctp conflict with another sctp stack

[Bora E. <bor...@gm...>]

Hi Wei,

I confirmed that this can be done by filtering ABORT packets using iptables.
You just saved my day :)

For anyone interested, below command blocks outgoing ABORT messages:
iptables -t filter -I OUTPUT -p sctp --chunk-types any ABORT -j DROP

Best regards,
Bora.


On Fri, Sep 28, 2012 at 1:18 PM, Bora Erbas <bor...@gm...> wrote:
> Hi Wei,
>
> Thanks for the reply.
> I had already tried "rmmod -f sctp" but it says busy even if no
> application is using it.
> I used sctp_test to load sctp then killed the sctp_test application.
> Even then it's not unloading.
>
> I will look into iptables: I am not particularly experienced on it.
>
> Regards,
> Bora.
>
> On Fri, Sep 28, 2012 at 12:56 PM, Wei Yongjun <wei...@gm...> wrote:
>> On 09/28/2012 05:06 PM, Bora Erbas wrote:
>>> Hi All,
>>>
>>> We have a home-grown SCTP stack which uses raw IP sockets
>>> (protocol=).
>>> On the same host, another application uses LKSCTP for SCTP traffic.
>>> And whenever lksctp is loaded to kernel after being used by the
>>> application, it interferes with the raw-ip-sctp.
>>> LKSCTP basically sends ABORT messages to the peer of the raw-ip-sctp
>>> stack and destroys the association.
>>> This happens even if the two sctp stacks use different network
>>> interfaces and ports.
>>>
>>> Even after the application that uses lksctp is killed, the problem
>>> persists until a reboot is performed.
>>> It comes back when lksctp is loaded back to the kernel.
>>>
>>> Platform is: CentOS 5.5.
>>> Linux host1 2.6.18-194.el5 #1 SMP Fri Apr 2 14:58:14 EDT 2010 x86_64
>>> x86_64 x86_64 GNU/Linux
>>>
>>> Netstat output for the raw ip socket:
>>> raw        0      0 0.0.0.0:132                 0.0.0.0:*
>>>      7
>>>
>>> So what I would like to know is this:
>>> 1. Is there a way to unload lksctp from kernel without rebooting? This
>>> won't solve my problems but just curious.
>>
>> you can using rmmod -f sctp, but this need you kernel support.
>>
>>> 2. Is it possible to have lksctp work side by side with a raw IP
>>> socket that also handles SCTP traffic?
>>
>> you can using iptables to drop those packet that handle by
>> the raw socket.
>>
>>>
>>> Any pointers on this subject is greatly appreciated.
>>> I am trying to get information on LKSCTP, which I am not very familiar
>>> yet, so any information will be useful for me.
>>>
>>> Thanks in advance.
>>>
>>> Best regards,
>>> Bora.
>>>
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>>
>>