根据rfc2553，ipv6地址是一个16字节的数组，用网络序存储。
3.2 IPv6 Address Structure
A new in6_addr structure holds a single IPv6 address and is defined
as a result of including <netinet/in.h>:
struct in6_addr {
uint8_t s6_addr[16]; /* IPv6 address */
};
This data structure contains an array of sixteen 8-bit elements, which make up one 128-bit IPv6 address. The IPv6 address is stored in network byte order.
IPv6地址由高位到低位存储在第0至15个uint8_t中。例如地址2001:0db8:1234::5210，rfc2553存储为（通过inet_pton）：
static const uint8_t myaddr[16] = { 0x20, 0x01, 0x0d, 0xb8, 0x12, 0x34, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x52, 0x10 };
上述地址转换为uint32_t网络序后：
static const uint32_t myaddr_network_byte_order[4]={ 0xb80d0120, 0x3412, 0x0, 0x10520000}
再转换为主机序后，这也是MAAT输入ipmatcher和rulescan的格式：
static const uint32_t myaddr_host_byte_order[4]={ 0x20010db8, 0x12340000, 0x0, 0x5210}
目前，ip_matcher中int数组高位到低位的顺序是a[3]a[2]a[1]a[0]，与RFC2553、Linux都不一致。
