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.