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

struct sk_buff * skb

buffer to reallocate

int nhead

room to add at head

int ntail

room to add at tail

gfp_t 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.