title: what does ip_route_input_noref() , ip_check_mc_rcu() and ip_route_input_mc() functions do?
body: <p>Recently i was researching Linux networking subsystem. There i found these functions <code>ip_route_input_noref()</code> , <code>ip_check_mc_rcu()</code> and <code>ip_route_input_mc()</code>.I searched a lot but did not find any documentation about these functions.Would you please tell me what does these functions actually do.</p>