ip6_err_gen_icmpv6_unreach
int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type,
if (!ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4 + tpi->hdr_len,
EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach);
!ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len))