Need Help with ip_output()

setutsi · 01-27-2009, 02:01 PM

hi all!
I am trying to build a kernel module which requires me to use the ip_output() function.

I have included the header file "<include/net/ip.h>"
which contains the declaration for ip_output().

when I compile with

make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

I get the warning below:
WARNING: "ip_output" [/home/eric/Desktop/modelnet/linux_module/linuxmodelnet.ko] undefined!

How do I get it to see the definition which is in "<net/ipv4/ip_output.c>"
Any help will be very much appreciated
thanks

titan22 · 04-13-2009, 11:42 PM

ip_output is not an exported API. Your device driver cannot use it, only functions in EXPORT_SYMBOL() can be used. The rest of the functions are internal to Linux.

For example: ip_queue_xmit can be used by your driver.
EXPORT_SYMBOL(ip_queue_xmit);