pep_alloc_skb
skb = pep_alloc_skb(sk, data, len, priority);
skb = pep_alloc_skb(sk, data, len, GFP_KERNEL);
skb = pep_alloc_skb(sk, data, 4, priority);
skb = pep_alloc_skb(sk, NULL, 0, GFP_KERNEL);
skb = pep_alloc_skb(sk, data, len, priority);