Linux networking implementation and packet capture

Linux networking implementation and packet capture

[Gaurav Aggarwal]

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Hi,

I am trying to understand the implementation of linux 2.4 and linux 2.6's
networking (IPV4) . Can anyone give me some idea/pointers about some of the
good resources/whitepapers available in the market to understand the same.
If there is any document that mention the changes between the implementation
of networking in 2.4 & 2.6

I am also trying to write a simple program(preferably a userspace
application) which captures all the incoming and outgoing packets of a
particular machine (preferably at PREROUTING stage), then according to the
SRC/DST addresses, changes the IP address of some of the packets and then
reinject it back into the local IP stack. I am able to do that in 2.4 kernel
by using libipq and ip_tables but that prog is not running in 2.6 kernel.
(It hits at ip_route_BUG). Any idea or code snippet will be really
appreciated.

-- 
Regards,
Gaurav Aggarwal

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Re: Linux networking implementation and packet capture

[Mohammad M Molla]

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There are two good books that you might find useful - 

1. Understanding Linux Network Internals - Christian Benvenuti
2. The Linux TCP/IP stack - Networking for Embedded Systems - Thomas F. Herbert

- Meraj

Gaurav Aggarwal <grv.aggarwal@gmail.com> wrote: Hi,

I am trying to understand the implementation of linux 2.4 and linux 2.6's networking (IPV4) . Can anyone give me some idea/pointers about some of the good resources/whitepapers available in the market to understand the same. If there is any document that mention the changes between the implementation of networking in  2.4 & 2.6

I am also trying to write a simple program(preferably a userspace application) which captures all the incoming and outgoing packets of a particular machine (preferably at PREROUTING stage), then according to the SRC/DST addresses, changes the IP address of some of the packets and then reinject it back into the local IP stack. I am able to do that in  2.4 kernel by using libipq and ip_tables but that prog is not running in 2.6 kernel. (It hits at ip_route_BUG). Any idea or code snippet will be really appreciated.

-- 
Regards,
Gaurav Aggarwal

 

       
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Re: Linux networking implementation and packet capture

[Alan Menegotto]

Gaurav Aggarwal escreveu:
> Hi,
>
> I am trying to understand the implementation of linux 2.4 and linux 
> 2.6's networking (IPV4) . Can anyone give me some idea/pointers about 
> some of the good resources/whitepapers available in the market to 
> understand the same. If there is any document that mention the changes 
> between the implementation of networking in 2.4 & 2.6
>
> I am also trying to write a simple program(preferably a userspace 
> application) which captures all the incoming and outgoing packets of a 
> particular machine (preferably at PREROUTING stage), then according to 
> the SRC/DST addresses, changes the IP address of some of the packets 
> and then reinject it back into the local IP stack. I am able to do 
> that in 2.4 kernel by using libipq and ip_tables but that prog is not 
> running in 2.6 kernel. (It hits at ip_route_BUG). Any idea or code 
> snippet will be really appreciated.
>
> -- 
> Regards,
> Gaurav Aggarwal
>
You may also see the information on the linux-net wiki: 
http://linux-net.osdl.org/index.php/Main_Page.

Also, read some threads on netdev list. It has a lot of information 
there too.





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--
Best Regards

Alan Menegotto