ipv6_icmp_sysctl_init  608 include/net/ipv6.h extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
ipv6_icmp_sysctl_init   80 net/ipv6/sysctl_net_ipv6.c 	ipv6_icmp_table = ipv6_icmp_sysctl_init(net);