ip_mroute_setsockopt   18 include/linux/mroute.h int ip_mroute_setsockopt(struct sock *, int, char __user *, unsigned int);
ip_mroute_setsockopt  640 net/ipv4/ip_sockglue.c 		return ip_mroute_setsockopt(sk, optname, optval, optlen);