Provided by: linux-doc-2.6.15_2.6.15-23.39_all bug

NAME
       pskb_expand_head - reallocate header of &sk_buff


SYNOPSIS
       int pskb_expand_head  (struct sk_buff * skb, int nhead, int ntail,
                               gfp_t gfp_mask);


ARGUMENTS
       skb    buffer to reallocate

       nhead  room to add at head

       ntail  room to add at tail

       gfp_mask
              allocation priority


DESCRIPTION
       Expands (or creates identical copy, if  &nhead  and  &ntail  are  zero)
       header  of  skb.  &sk_buff  itself  is  not changed. &sk_buff MUST have
       reference count of 1. Returns zero in the case of success or error,  if
       expansion failed. In the last case, &sk_buff is not changed.

       All  the  pointers  pointing  into  skb  header  may change and must be
       reloaded after call to this function.