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Instead of initializing network adapters in init.cpp, let's move that logic into a separate class to handle this. Also, it seems like a good idea to shift responsiblity on enumeration of network adapters after the boot process, so this singleton will take care of finding the appropriate network adapter when asked to with an IPv4 address or interface name. With this change being merged, we simplify the creation logic of NetworkAdapter derived classes, so we enumerate the PCI bus only once, searching for driver candidates when doing so, and we let each driver to test if it is resposible for the specified PCI device.
178 lines
5.5 KiB
C++
178 lines
5.5 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/HashTable.h>
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#include <AK/Singleton.h>
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#include <AK/StringBuilder.h>
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#include <Kernel/Heap/kmalloc.h>
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#include <Kernel/Lock.h>
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#include <Kernel/Net/EtherType.h>
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#include <Kernel/Net/LoopbackAdapter.h>
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#include <Kernel/Net/NetworkAdapter.h>
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#include <Kernel/Net/NetworkingManagement.h>
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#include <Kernel/Process.h>
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#include <Kernel/Random.h>
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#include <Kernel/StdLib.h>
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namespace Kernel {
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NetworkAdapter::NetworkAdapter()
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{
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}
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NetworkAdapter::~NetworkAdapter()
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{
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}
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void NetworkAdapter::send_packet(ReadonlyBytes packet)
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{
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m_packets_out++;
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m_bytes_out += packet.size();
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send_raw(packet);
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}
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void NetworkAdapter::send(const MACAddress& destination, const ARPPacket& packet)
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{
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size_t size_in_bytes = sizeof(EthernetFrameHeader) + sizeof(ARPPacket);
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auto buffer = NetworkByteBuffer::create_zeroed(size_in_bytes);
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auto* eth = (EthernetFrameHeader*)buffer.data();
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eth->set_source(mac_address());
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eth->set_destination(destination);
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eth->set_ether_type(EtherType::ARP);
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m_bytes_out += size_in_bytes;
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memcpy(eth->payload(), &packet, sizeof(ARPPacket));
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send_packet({ (const u8*)eth, size_in_bytes });
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}
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void NetworkAdapter::fill_in_ipv4_header(PacketWithTimestamp& packet, IPv4Address const& source_ipv4, MACAddress const& destination_mac, IPv4Address const& destination_ipv4, IPv4Protocol protocol, size_t payload_size, u8 ttl)
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{
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size_t ipv4_packet_size = sizeof(IPv4Packet) + payload_size;
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VERIFY(ipv4_packet_size <= mtu());
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size_t ethernet_frame_size = ipv4_payload_offset() + payload_size;
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VERIFY(packet.buffer.size() == ethernet_frame_size);
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memset(packet.buffer.data(), 0, ipv4_payload_offset());
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auto& eth = *(EthernetFrameHeader*)packet.buffer.data();
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eth.set_source(mac_address());
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eth.set_destination(destination_mac);
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eth.set_ether_type(EtherType::IPv4);
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auto& ipv4 = *(IPv4Packet*)eth.payload();
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ipv4.set_version(4);
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ipv4.set_internet_header_length(5);
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ipv4.set_source(source_ipv4);
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ipv4.set_destination(destination_ipv4);
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ipv4.set_protocol((u8)protocol);
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ipv4.set_length(sizeof(IPv4Packet) + payload_size);
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ipv4.set_ident(1);
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ipv4.set_ttl(ttl);
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ipv4.set_checksum(ipv4.compute_checksum());
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}
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void NetworkAdapter::did_receive(ReadonlyBytes payload)
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{
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InterruptDisabler disabler;
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m_packets_in++;
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m_bytes_in += payload.size();
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if (m_packet_queue_size == max_packet_buffers) {
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// FIXME: Keep track of the number of dropped packets
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return;
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}
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auto packet = acquire_packet_buffer(payload.size());
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if (!packet) {
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dbgln("Discarding packet because we're out of memory");
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return;
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}
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memcpy(packet->buffer.data(), payload.data(), payload.size());
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m_packet_queue.append(*packet);
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m_packet_queue_size++;
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if (on_receive)
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on_receive();
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}
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size_t NetworkAdapter::dequeue_packet(u8* buffer, size_t buffer_size, Time& packet_timestamp)
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{
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InterruptDisabler disabler;
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if (m_packet_queue.is_empty())
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return 0;
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auto packet_with_timestamp = m_packet_queue.take_first();
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m_packet_queue_size--;
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packet_timestamp = packet_with_timestamp->timestamp;
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auto& packet_buffer = packet_with_timestamp->buffer;
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size_t packet_size = packet_buffer.size();
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VERIFY(packet_size <= buffer_size);
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memcpy(buffer, packet_buffer.data(), packet_size);
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release_packet_buffer(*packet_with_timestamp);
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return packet_size;
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}
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RefPtr<PacketWithTimestamp> NetworkAdapter::acquire_packet_buffer(size_t size)
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{
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InterruptDisabler disabler;
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if (m_unused_packets.is_empty()) {
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auto buffer = KBuffer::create_with_size(size, Region::Access::Read | Region::Access::Write, "Packet Buffer", AllocationStrategy::AllocateNow);
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auto packet = adopt_ref_if_nonnull(new PacketWithTimestamp { move(buffer), kgettimeofday() });
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if (!packet)
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return nullptr;
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packet->buffer.set_size(size);
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return packet;
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}
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auto packet = m_unused_packets.take_first();
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if (packet->buffer.capacity() >= size) {
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packet->timestamp = kgettimeofday();
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packet->buffer.set_size(size);
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return packet;
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}
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auto buffer = KBuffer::create_with_size(size, Region::Access::Read | Region::Access::Write, "Packet Buffer", AllocationStrategy::AllocateNow);
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packet = adopt_ref_if_nonnull(new PacketWithTimestamp { move(buffer), kgettimeofday() });
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if (!packet)
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return nullptr;
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packet->buffer.set_size(size);
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return packet;
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}
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void NetworkAdapter::release_packet_buffer(PacketWithTimestamp& packet)
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{
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InterruptDisabler disabler;
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m_unused_packets.append(packet);
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}
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void NetworkAdapter::set_ipv4_address(const IPv4Address& address)
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{
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m_ipv4_address = address;
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}
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void NetworkAdapter::set_ipv4_netmask(const IPv4Address& netmask)
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{
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m_ipv4_netmask = netmask;
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}
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void NetworkAdapter::set_ipv4_gateway(const IPv4Address& gateway)
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{
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m_ipv4_gateway = gateway;
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}
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void NetworkAdapter::set_interface_name(const PCI::Address& pci_address)
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{
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// Note: This stands for e - "Ethernet", p - "Port" as for PCI bus, "s" for slot as for PCI slot
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auto name = String::formatted("ep{}s{}", pci_address.bus(), pci_address.device());
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VERIFY(!NetworkingManagement::the().lookup_by_name(name));
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m_name = move(name);
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}
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void NetworkAdapter::set_loopback_name()
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{
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auto name = String("loop");
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VERIFY(!NetworkingManagement::the().lookup_by_name(name));
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m_name = move(name);
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}
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}
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