30a96706cb
One can configure the NIC router to act as DHCP server at interfaces of a
domain by adding the <dhcp> tag to the configuration of the domain like
this:
<domain name="vbox" interface="10.0.1.1/24">
<dhcp-server ip_first="10.0.1.80"
ip_last="10.0.1.100"
ip_lease_time_sec="3600"
dns_server="10.0.0.2"/>
...
</domain>
The attributes ip_first and ip_last define the available IPv4 address
range while ip_lease_time_sec defines the lifetime of an IPv4 address
assignment in seconds. The IPv4 address range must be in the subnet
defined by the interface attribute of the domain tag and must not cover
the IPv4 address in this attribute. The dns_server attribute gives the
IPv4 address of the DNS server that might also be in another subnet.
The lifetime of an offered assignment is the configured round trip time of
the router while the ip_lease_time_sec is applied only if the offer is
requested by the client in time.
The ports/run/virtualbox_nic_router.run script is an example of how to
use the new DHCP server functionality.
Ref #2490
278 lines
8.0 KiB
C++
278 lines
8.0 KiB
C++
/*
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* \brief A net interface in form of a signal-driven NIC-packet handler
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* \author Martin Stein
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* \date 2016-08-24
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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 _INTERFACE_H_
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#define _INTERFACE_H_
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/* local includes */
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#include <link.h>
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#include <arp_cache.h>
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#include <arp_waiter.h>
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#include <l3_protocol.h>
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/* Genode includes */
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#include <nic_session/nic_session.h>
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#include <net/dhcp.h>
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namespace Net {
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using Packet_descriptor = ::Nic::Packet_descriptor;
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using Packet_stream_sink = ::Nic::Packet_stream_sink< ::Nic::Session::Policy>;
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using Packet_stream_source = ::Nic::Packet_stream_source< ::Nic::Session::Policy>;
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class Forward_rule_tree;
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class Transport_rule_list;
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class Ethernet_frame;
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class Arp_packet;
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class Ip_allocation;
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class Ip_allocation_tree;
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using Ip_allocation_list = Genode::List<Ip_allocation>;
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class Interface;
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class Dhcp_server;
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class Configuration;
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class Domain;
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}
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class Net::Ip_allocation : public Genode::Avl_node<Ip_allocation>,
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public Ip_allocation_list::Element
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{
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protected:
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Interface &_interface;
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Configuration &_config;
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Ipv4_address const _ip;
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Mac_address const _mac;
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Timer::One_shot_timeout<Ip_allocation> _release_timeout;
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bool _bound { false };
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void _handle_release_timeout(Genode::Duration);
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bool _higher(Mac_address const &mac) const;
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public:
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Ip_allocation(Interface &interface,
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Configuration &config,
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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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Ip_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(Ip_allocation *allocation) { return _higher(allocation->_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::Ip_allocation_tree : public Genode::Avl_tree<Ip_allocation>
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{
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struct No_match : Genode::Exception { };
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Ip_allocation &find_by_mac(Mac_address const &mac) const;
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};
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class Net::Interface
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{
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protected:
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using Signal_handler = Genode::Signal_handler<Interface>;
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Signal_handler _sink_ack;
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Signal_handler _sink_submit;
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Signal_handler _source_ack;
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Signal_handler _source_submit;
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Mac_address const _router_mac;
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Mac_address const _mac;
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private:
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Timer::Connection &_timer;
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Genode::Allocator &_alloc;
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Domain &_domain;
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Arp_cache _arp_cache;
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Arp_waiter_list _own_arp_waiters;
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Arp_waiter_list _foreign_arp_waiters;
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Link_side_tree _tcp_links;
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Link_side_tree _udp_links;
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Link_list _closed_tcp_links;
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Link_list _closed_udp_links;
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Ip_allocation_tree _ip_allocations;
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Ip_allocation_list _released_ip_allocations;
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void _new_link(L3_protocol const protocol,
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Link_side_id const &local_id,
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Pointer<Port_allocator_guard> const remote_port_alloc,
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Interface &remote_interface,
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Link_side_id const &remote_id);
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void _destroy_released_ip_allocations();
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void _destroy_ip_allocation(Ip_allocation &allocation);
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void _release_ip_allocation(Ip_allocation &allocation);
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void _send_dhcp_reply(Dhcp_server const &dhcp_srv,
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Mac_address const &client_mac,
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Ipv4_address const &client_ip,
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Dhcp_packet::Message_type msg_type,
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Genode::uint32_t xid);
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Forward_rule_tree &_forward_rules(L3_protocol const prot) const;
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Transport_rule_list &_transport_rules(L3_protocol const prot) const;
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void _handle_arp(Ethernet_frame ð, Genode::size_t const eth_size);
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void _handle_arp_reply(Arp_packet &arp);
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void _handle_arp_request(Ethernet_frame ð,
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Genode::size_t const eth_size,
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Arp_packet &arp);
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void _handle_dhcp_request(Ethernet_frame ð,
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Genode::size_t eth_size,
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Dhcp_packet &dhcp);
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void _handle_ip(Ethernet_frame ð,
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Genode::size_t const eth_size,
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Packet_descriptor const &pkt);
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void _adapt_eth(Ethernet_frame ð,
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Genode::size_t const eth_size,
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Ipv4_address const &ip,
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Packet_descriptor const &pkt,
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Interface &interface);
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void _nat_link_and_pass(Ethernet_frame ð,
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Genode::size_t const eth_size,
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Ipv4_packet &ip,
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L3_protocol const prot,
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void *const prot_base,
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Genode::size_t const prot_size,
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Link_side_id const &local_id,
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Interface &interface);
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void _broadcast_arp_request(Ipv4_address const &ip);
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void _send(Ethernet_frame ð, Genode::size_t const eth_size);
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void _pass_prot(Ethernet_frame ð,
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Genode::size_t const eth_size,
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Ipv4_packet &ip,
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L3_protocol const prot,
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void *const prot_base,
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Genode::size_t const prot_size);
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void _pass_ip(Ethernet_frame ð,
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Genode::size_t const eth_size,
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Ipv4_packet &ip);
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void _continue_handle_eth(Packet_descriptor const &pkt);
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Link_list &_closed_links(L3_protocol const protocol);
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Link_side_tree &_links(L3_protocol const protocol);
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Configuration &_config() const;
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Ipv4_address const &_router_ip() const;
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void _handle_eth(void *const eth_base,
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Genode::size_t const eth_size,
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Packet_descriptor const &pkt);
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void _ack_packet(Packet_descriptor const &pkt);
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void _cancel_arp_waiting(Arp_waiter &waiter);
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virtual Packet_stream_sink &_sink() = 0;
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virtual Packet_stream_source &_source() = 0;
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/***********************************
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** Packet-stream signal handlers **
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***********************************/
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void _ready_to_submit();
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void _ack_avail() { }
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void _ready_to_ack();
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void _packet_avail() { }
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public:
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struct Bad_transport_protocol : Genode::Exception { };
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struct Bad_network_protocol : Genode::Exception { };
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struct Packet_postponed : Genode::Exception { };
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struct Bad_dhcp_request : Genode::Exception { };
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struct Alloc_dhcp_reply_buffer_failed : Genode::Exception { };
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struct Dhcp_reply_buffer_too_small : Genode::Exception { };
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Interface(Genode::Entrypoint &ep,
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Timer::Connection &timer,
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Mac_address const router_mac,
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Genode::Allocator &alloc,
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Mac_address const mac,
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Domain &domain);
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~Interface();
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void link_closed(Link &link, L3_protocol const prot);
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void ip_allocation_expired(Ip_allocation &allocation);
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void dissolve_link(Link_side &link_side, L3_protocol const prot);
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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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Arp_waiter_list &own_arp_waiters() { return _own_arp_waiters; }
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Arp_waiter_list &foreign_arp_waiters() { return _foreign_arp_waiters; }
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};
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#endif /* _INTERFACE_H_ */
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