test_subnets.py 文件源码

def _create_subnet_with_last_subnet_block(cls, network, ip_version=4):
        """Derive last subnet CIDR block from tenant CIDR and
           create the subnet with that derived CIDR
        """
        if ip_version == 4:
            cidr = netaddr.IPNetwork(CONF.network.project_network_cidr)
            mask_bits = CONF.network.project_network_mask_bits
        elif ip_version == 6:
            cidr = netaddr.IPNetwork(CONF.network.project_network_v6_cidr)
            mask_bits = CONF.network.project_network_v6_mask_bits

        subnet_cidr = list(cidr.subnet(mask_bits))[-1]
        gateway_ip = str(netaddr.IPAddress(subnet_cidr) + 1)
        body = cls.create_subnet(network, gateway=gateway_ip,
                                 cidr=subnet_cidr, mask_bits=mask_bits)
        return body['subnet']