vm_tools/concierge/subnet.h

// Copyright 2018 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef VM_TOOLS_CONCIERGE_SUBNET_H_
#define VM_TOOLS_CONCIERGE_SUBNET_H_

#include <stdint.h>

#include <base/callback.h>
#include <base/macros.h>

namespace vm_tools {
namespace concierge {

// Represents an allocated subnet.
class Subnet {
 public:
  // Creates a new Subnet with the given network id and prefix.  |release_cb|
  // runs in the destructor of this class and can be used to free other
  // resources associated with the subnet.
  Subnet(uint32_t network_id, size_t prefix, base::Closure release_cb);
  ~Subnet();

  // Returns the address at the given |offset| in network byte order. Returns
  // INADDR_ANY if the offset exceeds the available IPs in the subnet.
  // Available IPs do not include the network id or the broadcast address.
  uint32_t AddressAtOffset(uint32_t offset) const;

  // Returns the number of available IPs in this subnet.
  size_t AvailableCount() const;

  // Returns the netmask.
  uint32_t Netmask() const;

  // Returns the prefix.
  size_t Prefix() const;

 private:
  // Subnet network id in host byte order.
  uint32_t network_id_;

  // Prefix.
  size_t prefix_;

  // Callback to run when this object is deleted.
  base::Closure release_cb_;

  DISALLOW_COPY_AND_ASSIGN(Subnet);
};

}  // namespace concierge
}  // namespace vm_tools

#endif  // VM_TOOLS_CONCIERGE_SUBNET_H_