PSKB_EXPAND_HEAD(9)                      Linux Networking                     PSKB_EXPAND_HEAD(9)



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.

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