92a30e0953
The router reacts as follows to a configuration change: 1) Construct new internal configuration representation (the old one stays in place to be able to do comparisons in the following steps) 2) Iterate through all user-dependent objects (interfaces, link states, ARP information, DHCP information) and re-check which remain valid with the new configuration and which must be dismissed. 3) Adapt the objects that remain valid to the new configuration (re-write references) and remove or detach the dismissed objects. 4) Do a link state DOWN at each interface and a link state UP at each interface that remains attached to a domain. 5) Replace the old internal configuration representation with the new one This way, the router keeps as much user dependent states as possible while going through a configuration change. Thus, overwriting the old configuration with an exact copy of itself is (almost) transparent to clients of the router. Almost, because there are things the router must do on every configuration handling, like re-scheduling the expiration timeouts of links. Ref #2670
336 lines
11 KiB
C++
336 lines
11 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_waiter.h>
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#include <l3_protocol.h>
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#include <dhcp_client.h>
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#include <dhcp_server.h>
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#include <list.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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using Domain_name = Genode::String<160>;
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class Leaf_rule;
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class Ipv4_config;
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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 Interface_policy;
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class Interface;
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using Interface_list = List<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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struct Net::Interface_policy
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{
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virtual Domain_name determine_domain_name() const = 0;
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virtual void handle_config(Configuration const &config) = 0;
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virtual ~Interface_policy() { }
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};
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class Net::Interface : private Interface_list::Element
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{
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friend class List<Interface>;
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friend class Genode::List<Interface>;
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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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struct Dismiss_link : Genode::Exception { };
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struct Dismiss_arp_waiter : Genode::Exception { };
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Reference<Configuration> _config;
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Interface_policy &_policy;
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Timer::Connection &_timer;
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Genode::Allocator &_alloc;
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Pointer<Domain> _domain { };
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Arp_waiter_list _own_arp_waiters { };
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Link_list _tcp_links { };
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Link_list _udp_links { };
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Link_list _dissolved_tcp_links { };
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Link_list _dissolved_udp_links { };
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Dhcp_allocation_tree _dhcp_allocations { };
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Dhcp_allocation_list _released_dhcp_allocations { };
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Dhcp_client _dhcp_client { _alloc, _timer, *this };
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Interface_list &_interfaces;
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bool _apply_foreign_arp_pending { false };
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Genode::Signal_context_capability _link_state_sigh { };
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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> remote_port_alloc,
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Domain &remote_domain,
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Link_side_id const &remote_id);
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void _destroy_released_dhcp_allocations(Domain &local_domain);
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void _destroy_dhcp_allocation(Dhcp_allocation &allocation,
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Domain &local_domain);
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void _release_dhcp_allocation(Dhcp_allocation &allocation,
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Domain &local_domain);
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void _new_dhcp_allocation(Ethernet_frame ð,
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Dhcp_packet &dhcp,
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Dhcp_server &dhcp_srv,
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Domain &local_domain);
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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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Ipv4_address_prefix const &local_intf);
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Forward_rule_tree &_forward_rules(Domain &local_domain,
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L3_protocol const prot) const;
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Transport_rule_list &_transport_rules(Domain &local_domain,
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L3_protocol const prot) const;
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void _handle_arp(Ethernet_frame ð,
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Genode::size_t const eth_size,
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Domain &local_domain);
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void _handle_arp_reply(Ethernet_frame ð,
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Genode::size_t const eth_size,
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Arp_packet &arp,
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Domain &local_domain);
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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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Domain &local_domain);
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void _send_arp_reply(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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Domain &local_domain);
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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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Domain &local_domain);
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void _adapt_eth(Ethernet_frame ð,
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Ipv4_address const &dst_ip,
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Packet_descriptor const &pkt,
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Domain &remote_domain);
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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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Domain &local_domain,
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Domain &remote_domain);
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void _broadcast_arp_request(Ipv4_address const &src_ip,
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Ipv4_address const &dst_ip);
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void _domain_broadcast(Ethernet_frame ð,
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Genode::size_t eth_size,
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Domain &local_domain);
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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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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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virtual Packet_stream_sink &_sink() = 0;
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virtual Packet_stream_source &_source() = 0;
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void _send_alloc_pkt(Genode::Packet_descriptor &pkt,
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void * &pkt_base,
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Genode::size_t pkt_size);
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void _send_submit_pkt(Genode::Packet_descriptor &pkt,
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void * &pkt_base,
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Genode::size_t pkt_size);
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void _update_dhcp_allocations(Domain &old_domain,
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Domain &new_domain);
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void _update_own_arp_waiters(Domain &domain);
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void _update_links(L3_protocol prot,
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Domain &cln_dom);
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void _update_link_check_nat(Link &link,
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Domain &new_srv_dom,
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L3_protocol prot,
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Domain &cln_dom);
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void _dismiss_link_log(Link &link,
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char const *reason);
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void _destroy_link(Link &link);
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void _detach_from_domain_raw();
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void _attach_to_domain_raw(Domain_name const &domain_name);
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void _detach_from_domain();
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void _attach_to_domain(Domain_name const &domain_name,
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bool apply_foreign_arp);
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void _apply_foreign_arp();
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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_send_dhcp_args : Genode::Exception { };
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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 Alloc_dhcp_msg_buffer_failed : Genode::Exception { };
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struct Dhcp_msg_buffer_too_small : Genode::Exception { };
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struct Drop_packet_inform : Genode::Exception
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{
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Genode::String<128> msg;
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template <typename... ARGS>
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Drop_packet_inform(ARGS... args) : msg({args...}) { }
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};
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struct Drop_packet_warn : Genode::Exception
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{
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Genode::String<128> msg;
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template <typename... ARGS>
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Drop_packet_warn(ARGS... args) : msg({args...}) { }
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};
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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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Configuration &config,
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Interface_list &interfaces,
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Interface_policy &policy);
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virtual ~Interface();
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void dhcp_allocation_expired(Dhcp_allocation &allocation);
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template <typename FUNC>
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void send(Genode::size_t pkt_size, FUNC && write_to_pkt)
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{
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try {
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Packet_descriptor pkt;
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void *pkt_base;
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_send_alloc_pkt(pkt, pkt_base, pkt_size);
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write_to_pkt(pkt_base);
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_send_submit_pkt(pkt, pkt_base, pkt_size);
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}
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catch (Packet_stream_source::Packet_alloc_failed) {
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Genode::warning("failed to allocate packet");
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}
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}
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void send(Ethernet_frame ð, Genode::size_t eth_size);
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Link_list &dissolved_links(L3_protocol const protocol);
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Link_list &links(L3_protocol const protocol);
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void cancel_arp_waiting(Arp_waiter &waiter);
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void handle_config(Configuration &new_config);
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void handle_config_aftermath();
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void detach_from_ip_config();
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bool link_state();
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void link_state_sigh(Genode::Signal_context_capability sigh);
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/***************
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** Accessors **
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***************/
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Domain &domain() { return _domain.deref(); }
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Mac_address router_mac() const { return _router_mac; }
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Arp_waiter_list &own_arp_waiters() { return _own_arp_waiters; }
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};
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#endif /* _INTERFACE_H_ */
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