SKB_COW(9)                               Linux Networking                              SKB_COW(9)



NAME
       skb_cow - copy header of skb when it is required

SYNOPSIS
       int skb_cow(struct sk_buff * skb, unsigned int headroom);

ARGUMENTS
       skb
           buffer to cow

       headroom
           needed headroom

DESCRIPTION
       If the skb passed lacks sufficient headroom or its data part is shared, data is
       reallocated. If reallocation fails, an error is returned and original skb is not changed.

       The result is skb with writable area skb->head...skb->tail and at least headroom of space
       at head.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                                SKB_COW(9)