kernel module to generate UDP & TCP traffic?

I'm considering writing a kernel module that will be used to generate and receive copious amounts of Ethernet, UDP, and TCP traffic. I would prefer to tweak/use an existing tool if any is available. Any suggestions?

Thanks,
Ben

Ben Greear <[email protected]>       <Ben_Greear AT excite.com>
President of Candela Technologies Inc      http://www.candelatech.com
ScryMUD:  http://scry.wanfear.com     http://scry.wanfear.com/~greear

net/core/pg3.c

It appears to be net/core/pktgen.c, but I found it :)

After reading through it a few times, I have a few questions:

It appears I can interject spacing between packets, and it also appears that it will basically busy-spin while waiting. So, can I assume it would be a pretty bad idea to configure large times between packet transmits? (ie does the nanosleep consume the machine?)

If I wanted this thing to send a packet that would be routed, I would just set the MAC of the router and the IP of the eventualy destination, correct?

It appears impossible to run traffic on two interfaces simultaneously with this module, is that true?

Would you accept a patch that turned many of these counters into 64bit counters?

Is there any similar module that can receive these packets on the other side and verify a correct packet was received?

Would you accept a patch that placed timestamps and sequence counters in the packets for latency detection and packet-drop detection?

Thanks,
Ben

Ben Greear <[email protected]>       <Ben_Greear AT excite.com>
President of Candela Technologies Inc      http://www.candelatech.com
ScryMUD:  http://scry.wanfear.com     http://scry.wanfear.com/~greear

How about using the tun/tap devices in the 2.4. kernels which can RX/TX Ethernet frames from/to userspace?

http://vtun.sourceforge.net

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                  Amit Kucheria
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I can already send/rcv packets with raw sockets, but the problem is that causes coppies to/from user space, which not only decreases throughput, but adds considerable latency. If I can run the generation down in the kernel, it will run much faster.

Ben Greear <[email protected]>       <Ben_Greear AT excite.com>
President of Candela Technologies Inc      http://www.candelatech.com
ScryMUD:  http://scry.wanfear.com     http://scry.wanfear.com/~greear

Hi.

I am trying to write a module that takes Ethernet packets from the user domain, and injects it into the proper place ( which I think is the sk_buffers ), so that to the IP, TCP layer, the packets look as if coming from the Ethernet device. Can someone please suggest me which files to look into, and which structs to handle, for getting this done. Also, I want to do the reverse task, i.e. take some particular packets ( say which come from a specific port ) from sk_buffers and send it to user space.

Please assume that this silly looking Rx/Tx has some importance :)

Regards.

Vasu.
III yr EE student.

try dev_queue_xmit in dev.c.

or u can see chapter 13 of this...

http://www.cs.unh.edu/cnrg/gherrin/linux-net.html

ENJOY!!!
Avni :-)

-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf Of Vasu
Sent: Tuesday, 16 April 2002 12:10 PM
To: linux-net
Subject: injecting packets

Hi.

I am trying to write a module that takes Ethernet packets from the user domain, and injects it into the proper place ( which I think is the sk_buffers ), so that to the IP, TCP layer, the packets look as if coming from the Ethernet device. Can someone please suggest me which files to look into, and which structs to handle, for getting this done. Also, I want to do the reverse task, i.e. take some particular packets ( say which come from a specific port ) from sk_buffers and send it to user space.

Please assume that this silly looking Rx/Tx has some importance :)

Regards.

Vasu.
III yr EE student.

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It sounds like you want the Universal Tunnel/Tap driver, that lives in drivers/net/tun.c