67 lines
1.3 KiB
C++
67 lines
1.3 KiB
C++
/*
|
|
* \brief MAC-address allocator
|
|
* \author Stefan Kalkowski
|
|
* \date 2010-08-25
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2010-2017 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU Affero General Public License version 3.
|
|
*/
|
|
|
|
#ifndef _MAC_ALLOCATOR_H_
|
|
#define _MAC_ALLOCATOR_H_
|
|
|
|
/* Genode includes */
|
|
#include <base/exception.h>
|
|
#include <net/mac_address.h>
|
|
|
|
namespace Net { class Mac_allocator; }
|
|
|
|
|
|
class Net::Mac_allocator
|
|
{
|
|
private:
|
|
|
|
Mac_address const _base;
|
|
bool _free[sizeof(_base.addr[0]) << 8];
|
|
|
|
public:
|
|
|
|
struct Alloc_failed : Genode::Exception {};
|
|
|
|
Mac_allocator(Mac_address base) : _base(base)
|
|
{
|
|
Genode::memset(&_free, true, sizeof(_free));
|
|
}
|
|
|
|
Mac_address alloc()
|
|
{
|
|
for (unsigned id = 0; id < sizeof(_free) / sizeof(_free[0]); id++) {
|
|
if (!_free[id]) {
|
|
continue; }
|
|
|
|
_free[id] = false;
|
|
Mac_address mac = _base;
|
|
mac.addr[5] = id;
|
|
return mac;
|
|
}
|
|
throw Alloc_failed();
|
|
}
|
|
|
|
void free(Mac_address mac) { _free[mac.addr[5]] = true; }
|
|
|
|
bool mac_managed_by_allocator(Mac_address const &mac) const
|
|
{
|
|
return _base.addr[0] == mac.addr[0] &&
|
|
_base.addr[1] == mac.addr[1] &&
|
|
_base.addr[2] == mac.addr[2] &&
|
|
_base.addr[3] == mac.addr[3] &&
|
|
_base.addr[4] == mac.addr[4];
|
|
}
|
|
};
|
|
|
|
#endif /* _MAC_ALLOCATOR_H_ */
|