skb->data += off;
#ifdef NET_SKBUFF_DATA_USES_OFFSET
skb->end = size;
+ off = nhead;
#else
skb->end = skb->head + size;
+#endif
/* {transport,network,mac}_header and tail are relative to skb->head */
skb->tail += off;
skb->transport_header += off;
skb->network_header += off;
skb->mac_header += off;
-#endif
skb->cloned = 0;
skb->nohdr = 0;
atomic_set(&skb_shinfo(skb)->dataref, 1);