nf_ct_attach
void nf_ct_attach(struct sk_buff *, const struct sk_buff *);
nf_ct_attach(skb, icmp_param->skb);
nf_ct_attach(nskb, oldskb);
nf_ct_attach(skb, org_skb);
nf_ct_attach(nskb, oldskb);
EXPORT_SYMBOL(nf_ct_attach);