Kernel space sockets
Hi, I'm trying to implement a UDP server in a kernel module. So far I have created the struct socket using sock_create_kern(), and used sock->ops->bind() on it. Now how do I send UDP datagrams? I looked at some code and found the function sock->ops->sendmsg() but I can't figure out where to put the destination address. I would appreciate it if someone could point me to some tutorial or sample code. Thanks, Josef - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Kernel space sockets
Juergen Quade wrote: On Fri, Mar 18, 2005 at 02:53:31PM +0100, Josef E. Galea wrote: Hi, I'm trying to implement a UDP server in a kernel module. So far I have created the struct socket using sock_create_kern(), and used sock->ops->bind() on it. Now how do I send UDP datagrams? I looked at some code and found the function sock->ops->sendmsg() but I can't figure out where to put the destination address. I would appreciate it if someone could point me to some tutorial or sample code. Maybe the sample code on this (german) site helps: http://ezs.kr.hsnr.de/TreiberBuch/Artikel/index.html Look at "Folge" 16. Juergen. Thanks :) Josef - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
init process and task_struct
Hi, Does the init process have a task_struct associated with it, and if yes where is this structure created? Thanks Josef - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
System call problem
Hi, I am implemeting a new system call for a project I'm working on. I added the system call to the file arch/i386/kernel/process.c and added the relevant entries in the files arch/i386/entry.S and include/asm-i386/unistd.h. My system call is made up of only two lines, a printk statement, and a return statement which gets the value of a field that I added to the task_struct structure. I compiled and booted the kernel and am trying to build a user space application that uses my system call, however gcc is returning this error: /tmp/cc4zgzUr.o(.text+0x4e): In functiono `get_rmt_paging': : undefined reference to `errno' Can anyone help me with this? Thanks Josef - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: System call problem
Steven Rostedt wrote: On Sat, 2005-02-26 at 15:17 +0100, Josef E. Galea wrote: I compiled and booted the kernel and am trying to build a user space application that uses my system call, however gcc is returning this error: /tmp/cc4zgzUr.o(.text+0x4e): In functiono `get_rmt_paging': : undefined reference to `errno' Where you defined your system call in the user space program (ie. where you declared your _syscall macro), did you also include ? -- Steve I included and it didn't solve the problem. Now i included and it did. Thanks for you help! Josef - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Sending IP datagrams
Hi, Is there any way, other than socket buffers, to send IP datagrams from a kernel module? If yes, can you please point me to some good tutorial or sample code Thanks Josef Galea - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Sending IP datagrams
Scott Feldman wrote: On Mar 7, 2005, at 3:48 PM, Josef E. Galea wrote: Hi, Is there any way, other than socket buffers, to send IP datagrams from a kernel module? If yes, can you please point me to some good tutorial or sample code See net/core/pktgen.c for an example. -scott AFAIK that module uses socket buffers (struct sk_buff) to send the packets. I was asking whether there was another way to send the IP datagrams. Thanks for your reply :) Josef - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
EXPORT_SYMBOL question
Hi,
I have 2 modules. The first one uses EXPORT_SYMBOL to make some function
available to other modules. These prototypes for these functions were
also put in a header file. Now the second module uses the functions the
functions defined in the first module by and includes the afore
mentioned header file. However when i'm compiling the module, I get a
symbol underfined warning. When I load the module it works as expected.
Is there any way to get rid of these warnings.
Another problem I'm having is that when I load the second module I get
`no version for "rbnode_initialize" found: kernel tainted.'
(rbnode_initialize is one of the functions exported by the first
module). Both MODULE_LICENSE("GPL"); and MODULE_VERSION are declared in
the two modules. Is there anything I'm missing?
Thanks
Josef Galea
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Re: EXPORT_SYMBOL question
Sam Ravnborg wrote:
On Mon, Mar 28, 2005 at 01:10:35PM +0200, Josef E. Galea wrote:
Hi,
I have 2 modules. The first one uses EXPORT_SYMBOL to make some function
available to other modules. These prototypes for these functions were
also put in a header file. Now the second module uses the functions the
functions defined in the first module by and includes the afore
mentioned header file. However when i'm compiling the module, I get a
symbol underfined warning. When I load the module it works as expected.
Is there any way to get rid of these warnings.
Another problem I'm having is that when I load the second module I get
`no version for "rbnode_initialize" found: kernel tainted.'
(rbnode_initialize is one of the functions exported by the first
module). Both MODULE_LICENSE("GPL"); and MODULE_VERSION are declared in
the two modules. Is there anything I'm missing?
You need to compile both modules at the same time.
Do something like this for your two modules foo and bar:
modules/Makefile
obj-y := foo/ bar/
modules/foo/<= Your foo module
modules/bar/<= Your bar module
Then when building the modules stay in modules/ and
execute:
make -C M=`pwd`
And to install modules:
make -C M=`pwd` modules_install
Sam
Thanks for your help. That solved both the warnings and the kernel
tainted message.
Josef
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Linux virtual memory manager
Hi, Can someone point me to a document explaining the differences between the 2.4 and the 2.6 virtual memory manager. Particularly I am looking for the function/s that replaces the try_to_swap_out() in the 2.6.x series of kernels. Thanks Josef - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
