200 lines
4.5 KiB
C++
200 lines
4.5 KiB
C++
/*
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* \brief DHCP server role of a domain
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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) 2016-2017 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 Affero General Public License version 3.
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*/
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#ifndef _DHCP_SERVER_H_
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#define _DHCP_SERVER_H_
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/* local includes */
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#include "ipv4_address_prefix.h"
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#include "bit_allocator_dynamic.h"
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#include "list.h"
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#include "pointer.h"
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/* Genode includes */
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#include <net/mac_address.h>
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#include <util/noncopyable.h>
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#include <util/xml_node.h>
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#include <timer_session/connection.h>
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namespace Net {
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class Configuration;
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class Dhcp_server;
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class Dhcp_allocation;
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class Dhcp_allocation_tree;
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using Dhcp_allocation_list = List<Dhcp_allocation>;
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/* forward declarations */
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class Interface;
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class Domain;
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class Domain_tree;
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}
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class Net::Dhcp_server : private Genode::Noncopyable
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{
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private:
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Ipv4_address const _dns_server;
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Pointer<Domain> const _dns_server_from;
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Genode::Microseconds const _ip_lease_time;
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Ipv4_address const _ip_first;
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Ipv4_address const _ip_last;
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Genode::uint32_t const _ip_first_raw;
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Genode::uint32_t const _ip_count;
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Genode::Bit_allocator_dynamic _ip_alloc;
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void _invalid(Domain &domain,
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char const *reason);
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Genode::Microseconds _init_ip_lease_time(Genode::Xml_node const node);
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Pointer<Domain> _init_dns_server_from(Genode::Xml_node const node,
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Domain_tree &domains);
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public:
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enum { DEFAULT_IP_LEASE_TIME_SEC = 3600 };
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struct Alloc_ip_failed : Genode::Exception { };
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struct Invalid : Genode::Exception { };
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Dhcp_server(Genode::Xml_node const node,
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Domain &domain,
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Genode::Allocator &alloc,
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Ipv4_address_prefix const &interface,
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Domain_tree &domains);
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Ipv4_address alloc_ip();
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void alloc_ip(Ipv4_address const &ip);
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void free_ip(Ipv4_address const &ip);
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bool ready() const;
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/*********
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** log **
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*********/
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void print(Genode::Output &output) const;
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/***************
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** Accessors **
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***************/
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Ipv4_address const &dns_server() const;
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Domain &dns_server_from() { return _dns_server_from(); }
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Genode::Microseconds ip_lease_time() const { return _ip_lease_time; }
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};
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class Net::Dhcp_allocation : public Genode::Avl_node<Dhcp_allocation>,
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public Dhcp_allocation_list::Element
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{
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protected:
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Interface &_interface;
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Ipv4_address const _ip;
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Mac_address const _mac;
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Timer::One_shot_timeout<Dhcp_allocation> _timeout;
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bool _bound { false };
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void _handle_timeout(Genode::Duration);
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bool _higher(Mac_address const &mac) const;
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public:
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Dhcp_allocation(Interface &interface,
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Ipv4_address const &ip,
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Mac_address const &mac,
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Timer::Connection &timer,
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Genode::Microseconds lifetime);
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~Dhcp_allocation();
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Dhcp_allocation &find_by_mac(Mac_address const &mac);
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void lifetime(Genode::Microseconds lifetime);
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/**************
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** Avl_node **
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**************/
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bool higher(Dhcp_allocation *alloc) { return _higher(alloc->_mac); }
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/*********
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** Log **
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*********/
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void print(Genode::Output &output) const;
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/***************
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** Accessors **
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***************/
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Ipv4_address const &ip() const { return _ip; }
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bool bound() const { return _bound; }
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void set_bound() { _bound = true; }
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};
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struct Net::Dhcp_allocation_tree
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{
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private:
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Genode::Avl_tree<Dhcp_allocation> _tree { };
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Dhcp_allocation_list _list { };
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public:
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struct No_match : Genode::Exception { };
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Dhcp_allocation &find_by_mac(Mac_address const &mac) const;
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void insert(Dhcp_allocation &dhcp_alloc)
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{
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_tree.insert(&dhcp_alloc);
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_list.insert(&dhcp_alloc);
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}
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void remove(Dhcp_allocation &dhcp_alloc)
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{
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_tree.remove(&dhcp_alloc);
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_list.remove(&dhcp_alloc);
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}
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Dhcp_allocation *first() { return _tree.first(); }
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template <typename FUNC>
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void for_each(FUNC && functor)
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{
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using List_item = Dhcp_allocation_list::Element;
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for (Dhcp_allocation *item = _list.first(); item; )
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{
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Dhcp_allocation *const next_item = item->List_item::next();
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functor(*item);
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item = next_item;
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}
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}
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};
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#endif /* _DHCP_SERVER_H_ */
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