ip_route_input
reason = ip_route_input(skb, iph->daddr, iph->saddr,
err = ip_route_input(skb_in, fl4_dec.daddr, fl4_dec.saddr,
err = ip_route_input(skb, nexthop, iph->saddr, ip4h_dscp(iph),
if (ip_route_input(skb2, eiph->daddr, eiph->saddr,
reason = ip_route_input(skb, iph->daddr, iph->saddr, 0, skb->dev);
reason = ip_route_input(skb, nhaddr, iph->saddr, 0, skb->dev);