85 lines
1.7 KiB
C++
85 lines
1.7 KiB
C++
/*
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* \brief Cache for received ARP information
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* \author Martin Stein
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* \date 2016-08-19
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*/
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/*
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* Copyright (C) 2016 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _ARP_CACHE_H_
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#define _ARP_CACHE_H_
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/* Genode includes */
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#include <net/ipv4.h>
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#include <net/ethernet.h>
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#include <util/avl_tree.h>
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#include <util/volatile_object.h>
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namespace Net {
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class Arp_cache;
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class Arp_cache_entry;
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using Arp_cache_entry_slot = Genode::Lazy_volatile_object<Arp_cache_entry>;
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}
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class Net::Arp_cache_entry : public Genode::Avl_node<Arp_cache_entry>
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{
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private:
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Ipv4_address const _ip;
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Mac_address const _mac;
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bool _higher(Ipv4_address const &ip) const;
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public:
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Arp_cache_entry(Ipv4_address const &ip, Mac_address const &mac);
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Arp_cache_entry const &find_by_ip(Ipv4_address const &ip) const;
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/**************
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** Avl_node **
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**************/
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bool higher(Arp_cache_entry *entry) { return _higher(entry->_ip); }
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/***************
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** Accessors **
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***************/
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Mac_address const &mac() const { return _mac; }
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};
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class Net::Arp_cache : public Genode::Avl_tree<Arp_cache_entry>
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{
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private:
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enum {
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ENTRIES_SIZE = 1024 * sizeof(Genode::addr_t),
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NR_OF_ENTRIES = ENTRIES_SIZE / sizeof(Arp_cache_entry),
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};
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Arp_cache_entry_slot _entries[NR_OF_ENTRIES];
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bool _init = true;
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unsigned _curr = 0;
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public:
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struct No_match : Genode::Exception { };
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void new_entry(Ipv4_address const &ip, Mac_address const &mac);
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Arp_cache_entry const &find_by_ip(Ipv4_address const &ip) const;
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};
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#endif /* _ARP_CACHE_H_ */
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