IN6_IS_ADDR_MULTICAST
#define IN6_IS_ADDR_MULTICAST(a) ((a)->s6_addr[0] == 0xff)
#define IN6_IS_ADDR_MULTICAST(a) ((a)->s6_addr[0] == 0xff)
#define IN6_IS_ADDR_MULTICAST(addr) \
#define IN6_IS_ADDR_MULTICAST(addr) \