Programming

You only have the headers installed, then. There's probably a way to install kernel source in your distro, but I don't know your distro.

You can get raw kernel source at kernel.org.

I found this:

Linux/arch/ppc/8260_io/enet.c

It is complete source of a network driver. I will try to get something from this and build my own simple driver.
Quick questions:
- there is no 'module_init' and 'module_exit' functions. Is 'module_init' sort of replacement for '__init' ?
- what is more - there is no 'module_exit' nor '__exit'. Isn't it necessary?

Well... it is also based on old net_structure :/

I don't think that's a generic network driver. It's for PowerPC only, it seems, and may be some kind of odd builtin.

Install some kernel source already(It's free) so you can use the files I suggested. Preferably the same version as the kernel you have, which you can get with 'cat /proc/verson'. If you can't find a way to install source in your distro you can still download tarballs from kernel.org

You seem to be having great difficulty getting going on building a simple network module. Let me try and help you. It is not difficult but can be a bit daunting the first time around.

1. Install the Ubuntu kernel sources for your current kernel See https://help.ubuntu.com/community/Kernel/Compile and elsewhere for how to do this. Follow the instructions to the letter. Do not try and take any shortcuts.

2. Copy the following source file from your kernel source tree to your work area: .../drivers/net/dummy.c. Read the comments at the top of this file for an explanation of the dummy network driver. This driver is about as simple as a 2.6 kernel network driver gets.

3. Create the following Makefile in your work area:

Code:

# If KERNELRELEASE is defined, we've been invoked from the
# kernel build system and can use its language.
ifneq ($(KERNELRELEASE),)
        obj-m := dummy.o
# Otherwise we were called directly from the command
# line; invoke the kernel build system.
else
        KERNELDIR ?= /lib/modules/$(shell uname -r)/build
        PWD := $(shell pwd)
default:
        $(MAKE) -C $(KERNELDIR) M=$(PWD) modules
endif

4. Type 'make'. dummy.ko should be built.

5. Install the dummy network driver using "inmod ./dummy.ko"

6. Possible operations:
To list this driver: ifconfig -a. It will show up as dummy0
To remove the driver: rmmod dummy0
To config the driver: ifconfig dummy0 192.168.0.100 netmask 255.255.255.0

Note you can have more than one dummy interface.

Thank you man. You made my day. I got working virtual driver at this moment. Now I add new features and work on makefile (that one you posted does not work for me: "nothing to do in 'default'").
Great job.

There is probably something wrong with your development/build environment if the Makefile did not work. It is basically the standard default build-a-module-outside-of-kernel-build-tree Makefile.

You are right. Typing 'echo $KERNELDIR' I got empty line. Typing 'uname -r' I got '2.6.31-14-generic'.

Normally I make using:

Code:

make -C /usr/src/linux-headers-2.6.31-14-generic/ M=$(pwd) modules