Capture network data before dev_queue_xmit and netif_rx in linux

In linux, dev_queue_xmit and netif_rx are used to intercept network data-Linux general technology-Linux programming and kernel information. For more information, see the following. Linux kernel 2.6.36
To intercept wireless network data, including the sent and received data, and then use wired transmission. Now I have found the sending and receiving functions in the linux protocol stack. I want to use the skb_copy function to copy the data and then forward the changes to a character device. Then, a socket application is used to control the data reading on the wired network. What are the specific processing processes? I just learned the protocol stack, but I don't know it in many places. There is also how to find the locations of the two functions, is it in the driver? The wired network card is DM9000, while the wireless network card is SD_wifi. If you want to provide similar source code, you can refer to it.