TCP as a module

TCP as a module

[Shan Sinha]

Hi everyone-

My web searches on this seem to turn up very little.  

Many people have suggested that TCP as a loadable module would be nice.
I am actually in a position where I think it might be necessary.

I am working on a research project on an ad-hoc 802.11 network spanning
through a local neighborhood.  There are multiple people developing on
the network with dozens of nodes all running 2.4.  Various kernels
across the network are updated at various times, but upgrades do happen
frequently.  Occassionally, kernels are uniformally updated across the
entire network.

My work specifically requires some TCP hacking.  As a result, I would
like to insulate my work from other kernel upgrades, so as not to have
to redo work.  Creating an isolated sandbox, while possible, is not
optimal, b/c the kernel upgrades are usually necessary and worth
incorporating. 

As a result, I would like to implement a new transport layer module
based on the TCP code, but with its own address family.  I realize I
might have to re-compile a few tools, but I use few enough of those,
that it should be no problem.  

Looking at the code, I assume that a starting step would be to figure
out how to implement TCP as a module.  

+ Has anyone actually done this or know of someone who has?  Any
advice/links would be useful.  
+ Or does anyone know for certain that doing this is just not possible?
If so, why not?

I'm willing to live with idiosyncracies in how such a TCP module would
behave for making my development life easier, I think this is necessary!
The idea would be that once some of my work actually demonstrates
positive results, to re-implement back into the core kernel code.

If you have a better solution, I would love to hear it!

Cheers-
Shan

Shan Sinha
Networks and Mobile Systems
Laboratory for Computer Science and AI
MIT

For information on the research project, visit
http://pdos.lcs.mit.edu/roofnet

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Re: TCP as a module

[Eric]

Have you tried CC'ing linux-kernel mailing list?
I could be wrong but linux-newbie seems a bit out of place for a post dealing 
with kernel code development.

the address is 
linux-kernel@vger.kernel.org
and you can subscribe at www.kernel.org

Just a suggestion, I hope you find the answers you're looking for there.

On Saturday 26 July 2003 10:25 am, Shan Sinha wrote:
> Hi everyone-
>
> My web searches on this seem to turn up very little.
>
> Many people have suggested that TCP as a loadable module would be nice.
> I am actually in a position where I think it might be necessary.
>
> I am working on a research project on an ad-hoc 802.11 network spanning
> through a local neighborhood.  There are multiple people developing on
> the network with dozens of nodes all running 2.4.  Various kernels
> across the network are updated at various times, but upgrades do happen
> frequently.  Occassionally, kernels are uniformally updated across the
> entire network.
>
> My work specifically requires some TCP hacking.  As a result, I would
> like to insulate my work from other kernel upgrades, so as not to have
> to redo work.  Creating an isolated sandbox, while possible, is not
> optimal, b/c the kernel upgrades are usually necessary and worth
> incorporating.
>
> As a result, I would like to implement a new transport layer module
> based on the TCP code, but with its own address family.  I realize I
> might have to re-compile a few tools, but I use few enough of those,
> that it should be no problem.
>
> Looking at the code, I assume that a starting step would be to figure
> out how to implement TCP as a module.
>
> + Has anyone actually done this or know of someone who has?  Any
> advice/links would be useful.
> + Or does anyone know for certain that doing this is just not possible?
> If so, why not?
>
> I'm willing to live with idiosyncracies in how such a TCP module would
> behave for making my development life easier, I think this is necessary!
> The idea would be that once some of my work actually demonstrates
> positive results, to re-implement back into the core kernel code.
>
> If you have a better solution, I would love to hear it!
>
> Cheers-
> Shan
>
> Shan Sinha
> Networks and Mobile Systems
> Laboratory for Computer Science and AI
> MIT
>
> For information on the research project, visit
> http://pdos.lcs.mit.edu/roofnet
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-newbie" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.linux-learn.org/faqs

-- 

----------------------
Eric Bambach   
Eric (at) CISU (dot) net 
----------------------
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Re: TCP as a module

[Mr. James W. Laferriere]

	Hello Eric ,  If a question has to do with Networking please
	forward the person to netdev or linux-net maillists .  DaveM
	(& others) will be ranting at the person for posting a network
	question on the kernel list otherwise .  JimL

On Sun, 27 Jul 2003, Eric wrote:
> Have you tried CC'ing linux-kernel mailing list?
> I could be wrong but linux-newbie seems a bit out of place for a post
> dealing with kernel code development.
> the address is
> linux-kernel@vger.kernel.org
> and you can subscribe at www.kernel.org
> Just a suggestion, I hope you find the answers you're looking for there.

-- 
       +------------------------------------------------------------------+
       | James   W.   Laferriere | System    Techniques | Give me VMS     |
       | Network        Engineer |     P.O. Box 854     |  Give me Linux  |
       | babydr@baby-dragons.com | Coudersport PA 16915 |   only  on  AXP |
       +------------------------------------------------------------------+
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TCP as a module

[Md. Islam]

Hi

Currently TCP is statically linked to the kernel. How can I make it a
loadable module? I need to modify TCP (tcp_input.c and tcp_output.c). It
would be easier for my development if it's just another module (I don't
need to restart every time).

I changed the *fs_initcall(inet_init)* to *module_init(inet_init)*, but
doesn't seem to help. Looking forward to your suggestions.

Many thanks
Tamim
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TCP as a module

[Valdis.Kletnieks at vt.edu]

On Sat, 05 Nov 2016 21:10:19 -0400, "Md. Islam" said:

> Currently TCP is statically linked to the kernel. How can I make it a
> loadable module? I need to modify TCP (tcp_input.c and tcp_output.c).

What problem are you trying to solve by modifying those two?  There
may be other approaches to do it.


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TCP as a module

[Aruna Hewapathirane]

> Currently TCP is statically linked to the kernel.

Correct, so how is this done and where ? Once you figure that part
out you have what you need to do what you want to :)

> How can I make it a loadable module?

Change into your source tree, look for this file:
linux-4.7.2/linux-4.7.2/net/Kconfig

Kconfig  is used by the KBuild system that menuconfig uses.

Look for the section:
config INET
bool "TCP/IP networking" <-- change bool to tristate, save and run make
menuconfig.

Now you can ask menuconfig to build TCP as a module.

But... it may be better to if you can use:
https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt

One last thing, heed the warnings in Kconfig they are there for a reason.

Good luck and what exactly are you trying to do ? Am curious.

Aruna ( Shrugs and gets ready to duck a flying trout Valdis may send my way
:)
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TCP as a module

[Md. Islam]

Hi Aruna

Thanks a lot! I changed the Kconfig to tristate and set the
config_INET=m. I also needed to add "depends on CONFIG_INET" to other
config options those depend on INET. I could build it. But when I
reboot,  I got the following error and it doesn't boot. Giving up :-(

error getting socket: Address family not supported by protocol
error initializing udev control socket

I'm trying to write a Media-friendly TCP (by implementing a new
option). Please let me know if you have any suggestion.

Many thanks
Tamim

On Mon, Nov 14, 2016 at 7:17 AM, Aruna Hewapathirane
<aruna.hewapathirane@gmail.com> wrote:
>> Currently TCP is statically linked to the kernel.
>
> Correct, so how is this done and where ? Once you figure that part
> out you have what you need to do what you want to :)
>
>> How can I make it a loadable module?
>
> Change into your source tree, look for this file:
> linux-4.7.2/linux-4.7.2/net/Kconfig
>
> Kconfig  is used by the KBuild system that menuconfig uses.
>
> Look for the section:
> config INET
> bool "TCP/IP networking" <-- change bool to tristate, save and run make
> menuconfig.
>
> Now you can ask menuconfig to build TCP as a module.
>
> But... it may be better to if you can use:
> https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt
>
> One last thing, heed the warnings in Kconfig they are there for a reason.
>
> Good luck and what exactly are you trying to do ? Am curious.
>
> Aruna ( Shrugs and gets ready to duck a flying trout Valdis may send my way
> :)



-- 
Tamim
PhD Student/Graduate Assistant
CS Department, Kent State University
Kent, OH 44240
http://web.cs.kent.edu/~mislam4/

TCP as a module

[Valdis.Kletnieks at vt.edu]

On Tue, 15 Nov 2016 00:14:43 -0500, "Md. Islam" said:

> I'm trying to write a Media-friendly TCP (by implementing a new
> option). Please let me know if you have any suggestion.

Step 0:  Figure out what the new option is, and why you think it will be
media-friendly.  Hint:  some 80% of internet traffic is streaming video, and
seems to be doing OK without any new options.  So you may want to double-check
what you're planning to achieve.  There's a pretty good chance that what you're
trying to do can *already* be done with an existing tunable parameter, or with
a traffic control module external to the main TCP stack (see the work on
fq_codel to stop bufferbloat for an example).

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