ipv6_sock_ac_join  160 include/net/addrconf.h extern int ipv6_sock_ac_join(struct sock *sk,int ifindex,struct in6_addr *addr);
ipv6_sock_ac_join  520 net/ipv6/ipv6_sockglue.c 			retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);