kernel-module

For testing purposes, I am using the example recipe provided by yocto to demonstrate how to build kernel modules. SUMMARY = "Example of how to build an external Linux kernel module" LICENSE = "GPLv2" LIC_FILES_CHKSUM = "file://COPYING;md5=12f884d2ae1ff87c09e5b7ccc2c4ca7e" inherit module PR = "r0" PV = "0.1" SRC_URI = "file://Makefile \ file://hello.c \ file://COPYING \ " S = "${WORKDIR}" # The inherit of module.bbclass will automatically name module packages with # "kernel-module-" prefix as required by the oe-core build environment. The hello.c file is very simple. #include <linux/module.h>

I have a kernel module that captures outgoing Internet traffic(Netfilter hook: LOCAL_OUT) At this hook, there's still no Ethernet header. I built the Ethernet header and it's ready to use, but how can I attach it to the skb so that I can send the whole skb struct to dev_queue_xmit() ? Is there any guide on how to manipulate sk_buff data that you can provide me for further information? As a sample, I try to do what I want to do on all ECHO ICMP traffic; this is the code I have. But when checking with Wireshark on the other machine, I get a working Ethernet header but an EMPTY IP packet...how

As discussed in this question, i am reserving a memory chunk at the boot time using a kernel boot parameter memmap=8G$64G I have written a character driver kernel module which , during initialization does a ioremap of this reserved memory chunk. As explained here , in my driver mmap all i need to do is remap_pfn_range for this memory chunk pointer returned by the ioremap . I am running this on 3.0 linux kernel . My user space application opens this memory chunk as a device mounted by the driver. When i do mmap from the use space application i see a system hang. my dmesg don't provide me much

There are many instances of __init calls in kernel both in drivers module_init and other functions of kernel. My doubt is how exactly kernel determines the sequence of the __init call. More importantly, How it also determine the sequence of driver module_init call? Ilya Matveychikov All the init magic are implemented in files: include/asm-generic/vmlinux.lds.h include/linux/init.h init/main.c Firstly, look at include/asm-generic/vmlinux.lds.h that contains the following : 13 * . = START; 14 * __init_begin = .; 15 * HEAD_TEXT_SECTION 16 * INIT_TEXT_SECTION(PAGE_SIZE) 17 * INIT_DATA_SECTION(...)

I'm currently writing a Linux kernel module, and have problems implementing its communication with user space programs. This kernel module needs to receive tasks issued by a user space program, and send results back to user space program after completion. The user space program should be blocked while the kernel module is doing its job. I think a kernel-user space IPC or an Unix socket would be sweet, but I had no luck finding an example by Google. Currently my ugly solution is to export a chardev and let user space program write requests to the device file, and read results from it. But I can

I know there a number of walkthroughs and tutorials floating around out there which describe this activity, but after having read many of them I still can't get this working. If anyone has the patience to wade through the steps I've taken (posted below) and suggest where I may have gone off track I'd be very appreciative. I've spent about a day and a half staring at make files and reading walkthroughs so literally any suggestions would be helpful. Environment: I'm using an Ubuntu 10.04 32 bit vm. I'm hosting from a 64 bit windows 7 My Core 2 Duo does not have the hardware support for 64 bit