iptun_addr_t
iptun_addr_t orig_laddr, orig_raddr;
iptun_addr_t addr;
iptun_getaddr(iptun_addr_t *iptun_addr, struct sockaddr_storage *ss)
iptun_setaddr(iptun_type_t iptun_type, iptun_addr_t *iptun_addr,
iptun_addr_t iptun_laddr; /* local address */
iptun_addr_t iptun_raddr; /* remote address */