xfrm6_tunnel_register
int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
err = xfrm6_tunnel_register(&mplsip6_handler, AF_MPLS);
err = xfrm6_tunnel_register(&vti_ipv6_handler, AF_INET6);
err = xfrm6_tunnel_register(&vti_ip6ip_handler, AF_INET);
EXPORT_SYMBOL(xfrm6_tunnel_register);
rv = xfrm6_tunnel_register(&xfrm6_tunnel_handler, AF_INET6);
rv = xfrm6_tunnel_register(&xfrm46_tunnel_handler, AF_INET);
err = xfrm6_tunnel_register(&xfrmi_ipv6_handler, AF_INET6);
err = xfrm6_tunnel_register(&xfrmi_ip6ip_handler, AF_INET);