rpfilter_is_loopback 64 net/ipv4/netfilter/ipt_rpfilter.c if (rpfilter_is_loopback(skb, xt_in(par))) rpfilter_is_loopback 97 net/ipv6/netfilter/ip6t_rpfilter.c if (rpfilter_is_loopback(skb, xt_in(par)))