ip6_mroute_getsockopt 137 include/linux/mroute6.h extern int ip6_mroute_getsockopt(struct sock *, int, char __user *, int __user *); ip6_mroute_getsockopt 856 net/ipv6/ipv6_sockglue.c return ip6_mroute_getsockopt(sk, optname, optval, optlen);