kernels/linux-2.4.0/include/linux/skbuff.h
/**
 *	skb_reserve - adjust headroom
 *	@skb: buffer to alter
 *	@len: bytes to move
 *
 *	Increase the headroom of an empty &sk_buff by reducing the tail
 *	room. This is only allowed for an empty buffer.
 */
adjust headroom
@skb: buffer to alter
@len: bytes to move

Increase the headroom of an empty &sk_buff by reducing the tail
room. This is only allowed for an empty buffer.
adjust headroom @skb : buffer to alter @len : bytes to move Increase the headroom of an empty &sk_buff by reducing the tail room . This is only allowed for an empty buffer .
static inline void skb_reserve(struct sk_buff *skb, unsigned int len)
{
	skb->data+=len;
	skb->tail+=len;
}
static inline void skb_reserve ( struct sk_buff * skb , unsigned int len ) { skb -> data += len ; skb -> tail += len ; }
skb_reserve - adjust headroom
      @skb: buffer to alter
      @len: bytes to move
skb_reserve - adjust headroom @skb : buffer to alter @len : bytes to move