suse man page for skb_push

SKB_PUSH(9)							 Linux Networking						       SKB_PUSH(9)

NAME
       skb_push - add data to the start of a buffer

SYNOPSIS
       unsigned char * skb_push(struct sk_buff * skb, unsigned int len);

ARGUMENTS
       skb
	   buffer to use

       len
	   amount of data to add

DESCRIPTION
       This function extends the used data area of the buffer at the buffer start. If this would exceed the total buffer headroom the kernel will
       panic. A pointer to the first byte of the extra data is returned.

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010							       SKB_PUSH(9)