ip_mroute_getsockopt 149 include/linux/mroute.h extern int ip_mroute_getsockopt(struct sock *, int, char __user *, int __user *); ip_mroute_getsockopt 974 net/ipv4/ip_sockglue.c return ip_mroute_getsockopt(sk,optname,optval,optlen);