nf_send_unreach
void nf_send_unreach(struct sk_buff *skb_in, int code, int hook);
nf_send_unreach(skb, ICMP_NET_UNREACH, hook);
nf_send_unreach(skb, ICMP_HOST_UNREACH, hook);
nf_send_unreach(skb, ICMP_PROT_UNREACH, hook);
nf_send_unreach(skb, ICMP_PORT_UNREACH, hook);
nf_send_unreach(skb, ICMP_NET_ANO, hook);
nf_send_unreach(skb, ICMP_HOST_ANO, hook);
nf_send_unreach(skb, ICMP_PKT_FILTERED, hook);
EXPORT_SYMBOL_GPL(nf_send_unreach);
nf_send_unreach(pkt->skb, priv->icmp_code, nft_hook(pkt));
nf_send_unreach(pkt->skb, priv->icmp_code,
nf_send_unreach(pkt->skb,