> do you know of the kernel API functions that are used to built a sk_buff? > > i am interested in where the kernel actually fills the struct sk_buff that > is about to be transmitted by the network card. > the struct is not filled in the driver level, because (i believe) the > driver already gets a 'ready-to-take-off' sk_buff that can be send. > maybe the function that calls the xmit() function of the corresponding > driver, builts the sk_buff. but actually, i dont know for sure. > > there must be a function or several that are responsible for the correct > filling of a sk_buff struct, depending on the desired packet, like syn or > rst flag set. > > hope i've made myself clear enough. There is a Kernel API called dev_queue_xmit. Actually this function calls the xmit function of the device. The layer upper to the driver is the network layer. So each type of these fills the sk_buff, before giving to the driver. Eg:- IPv4, IPv6,etc... (it will be there in the protocol specific codes). ---- net/ipv4/arp.c: dev_queue_xmit(skb); Then calls the dev_queue_xmit. And I think dev_queue_xmit handles the network QOS. I've not gone deep into it. But went through the code in brief. Pls do try a grep in source... Regards, Shine Mohamed -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
