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.