vm_tools/concierge/mac_address_generator.cc

// Copyright 2017 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.

#include "vm_tools/concierge/mac_address_generator.h"

#include <base/rand_util.h>

namespace vm_tools {
namespace concierge {

MacAddress MacAddressGenerator::Generate() {
  MacAddress addr;
  do {
    base::RandBytes(addr.data(), addr.size());

    // Set the locally administered flag.
    addr[0] |= static_cast<uint8_t>(0x02);

    // Unset the multicast flag.
    addr[0] &= static_cast<uint8_t>(0xfe);
  } while (addrs_.find(addr) != addrs_.end());

  addrs_.insert(addr);

  return addr;
}

}  // namespace concierge
}  // namespace vm_tools