skb_headers_offset_update
void skb_headers_offset_update(struct sk_buff *skb, int off);
EXPORT_SYMBOL(skb_headers_offset_update);
skb_headers_offset_update(skb, nhead);
skb_headers_offset_update(n, newheadroom - oldheadroom);
skb_headers_offset_update(nskb, skb_headroom(nskb) - skb_headroom(skb));
skb_headers_offset_update(nskb, skb_headroom(nskb) - headroom);
skb_headers_offset_update(skb, 0);
skb_headers_offset_update(skb, 0);
skb_headers_offset_update(nskb, head_off);