pskb_expand_head — reallocate header of &sk_buff
int pskb_expand_head ( | struct sk_buff * skb, |
int nhead, | |
int ntail, | |
gfp_t gfp_mask) ; |
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
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.