static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
{
	return (a->s6_addr32[0] | a->s6_addr32[1] |
		 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0;
}
static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
{
	return (a->s6_addr32[0] | a->s6_addr32[1] |
		 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0;
}