mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-21 10:19:03 +03:00
6d1418aa7a
This replaces the previous placeholder routing layer with a real one! It's still very primitive, doesn't deal with things like timeouts very well, and will probably need several more iterations to support more normal networking things. I haven't confirmed that this works with anything other than the QEMU user networking layer, but I suspect that's what nearly everybody is using at this point, so that's the important target to keep working.
559 lines
22 KiB
C++
559 lines
22 KiB
C++
#include <Kernel/Lock.h>
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#include <Kernel/Net/ARP.h>
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#include <Kernel/Net/EtherType.h>
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#include <Kernel/Net/EthernetFrameHeader.h>
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#include <Kernel/Net/ICMP.h>
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#include <Kernel/Net/IPv4.h>
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#include <Kernel/Net/IPv4Socket.h>
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#include <Kernel/Net/LoopbackAdapter.h>
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#include <Kernel/Net/Routing.h>
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#include <Kernel/Net/TCP.h>
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#include <Kernel/Net/TCPSocket.h>
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#include <Kernel/Net/UDP.h>
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#include <Kernel/Net/UDPSocket.h>
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#include <Kernel/Process.h>
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//#define NETWORK_TASK_DEBUG
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//#define ETHERNET_DEBUG
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//#define ETHERNET_VERY_DEBUG
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//#define ARP_DEBUG
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//#define IPV4_DEBUG
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//#define ICMP_DEBUG
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//#define UDP_DEBUG
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//#define TCP_DEBUG
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static void handle_arp(const EthernetFrameHeader&, size_t frame_size);
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static void handle_ipv4(const EthernetFrameHeader&, size_t frame_size);
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static void handle_icmp(const EthernetFrameHeader&, const IPv4Packet&);
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static void handle_udp(const IPv4Packet&);
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static void handle_tcp(const IPv4Packet&);
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void NetworkTask_main()
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{
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u8 octet = 15;
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int pending_packets = 0;
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NetworkAdapter::for_each([&octet, &pending_packets](auto& adapter) {
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if (String(adapter.class_name()) == "LoopbackAdapter") {
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adapter.set_ipv4_address({ 127, 0, 0, 1 });
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adapter.set_ipv4_netmask({ 255, 0, 0, 0 });
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adapter.set_ipv4_gateway({ 0, 0, 0, 0 });
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} else {
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adapter.set_ipv4_address({ 10, 0, 2, octet++ });
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adapter.set_ipv4_netmask({ 255, 255, 255, 0 });
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adapter.set_ipv4_gateway({ 10, 0, 2, 2 });
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}
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kprintf("NetworkTask: %s network adapter found: hw=%s address=%s netmask=%s gateway=%s\n",
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adapter.class_name(),
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adapter.mac_address().to_string().characters(),
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adapter.ipv4_address().to_string().characters(),
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adapter.ipv4_netmask().to_string().characters(),
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adapter.ipv4_gateway().to_string().characters());
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adapter.set_on_receive([&pending_packets]() {
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pending_packets++;
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});
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});
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auto dequeue_packet = [&pending_packets]() -> Optional<KBuffer> {
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Optional<KBuffer> packet;
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NetworkAdapter::for_each([&packet, &pending_packets](auto& adapter) {
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if (packet.has_value() || !adapter.has_queued_packets())
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return;
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packet = adapter.dequeue_packet();
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pending_packets--;
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#ifdef NETWORK_TASK_DEBUG
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kprintf("NetworkTask: Dequeued packet from %s (%d bytes)\n", adapter.name().characters(), packet.value().size());
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#endif
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});
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return packet;
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};
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kprintf("NetworkTask: Enter main loop.\n");
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for (;;) {
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auto packet_maybe_null = dequeue_packet();
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if (!packet_maybe_null.has_value()) {
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(void)current->block_until("Networking", [&pending_packets] {
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return pending_packets > 0;
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});
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continue;
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}
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auto& packet = packet_maybe_null.value();
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if (packet.size() < sizeof(EthernetFrameHeader)) {
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kprintf("NetworkTask: Packet is too small to be an Ethernet packet! (%zu)\n", packet.size());
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continue;
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}
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auto& eth = *(const EthernetFrameHeader*)packet.data();
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#ifdef ETHERNET_DEBUG
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kprintf("NetworkTask: From %s to %s, ether_type=%w, packet_length=%u\n",
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eth.source().to_string().characters(),
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eth.destination().to_string().characters(),
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eth.ether_type(),
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packet.size());
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#endif
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#ifdef ETHERNET_VERY_DEBUG
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u8* data = packet.data();
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for (size_t i = 0; i < packet.size(); i++) {
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kprintf("%b", data[i]);
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switch (i % 16) {
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case 7:
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kprintf(" ");
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break;
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case 15:
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kprintf("\n");
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break;
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default:
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kprintf(" ");
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break;
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}
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}
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kprintf("\n");
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#endif
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switch (eth.ether_type()) {
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case EtherType::ARP:
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handle_arp(eth, packet.size());
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break;
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case EtherType::IPv4:
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handle_ipv4(eth, packet.size());
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break;
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case EtherType::IPv6:
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// ignore
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break;
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default:
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kprintf("NetworkTask: Unknown ethernet type %#04x\n", eth.ether_type());
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}
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}
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}
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void handle_arp(const EthernetFrameHeader& eth, size_t frame_size)
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{
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constexpr size_t minimum_arp_frame_size = sizeof(EthernetFrameHeader) + sizeof(ARPPacket);
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if (frame_size < minimum_arp_frame_size) {
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kprintf("handle_arp: Frame too small (%d, need %d)\n", frame_size, minimum_arp_frame_size);
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return;
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}
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auto& packet = *static_cast<const ARPPacket*>(eth.payload());
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if (packet.hardware_type() != 1 || packet.hardware_address_length() != sizeof(MACAddress)) {
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kprintf("handle_arp: Hardware type not ethernet (%w, len=%u)\n",
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packet.hardware_type(),
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packet.hardware_address_length());
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return;
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}
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if (packet.protocol_type() != EtherType::IPv4 || packet.protocol_address_length() != sizeof(IPv4Address)) {
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kprintf("handle_arp: Protocol type not IPv4 (%w, len=%u)\n",
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packet.hardware_type(),
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packet.protocol_address_length());
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return;
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}
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#ifdef ARP_DEBUG
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kprintf("handle_arp: operation=%w, sender=%s/%s, target=%s/%s\n",
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packet.operation(),
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packet.sender_hardware_address().to_string().characters(),
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packet.sender_protocol_address().to_string().characters(),
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packet.target_hardware_address().to_string().characters(),
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packet.target_protocol_address().to_string().characters());
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#endif
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if (packet.operation() == ARPOperation::Request) {
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// Who has this IP address?
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if (auto adapter = NetworkAdapter::from_ipv4_address(packet.target_protocol_address())) {
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// We do!
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kprintf("handle_arp: Responding to ARP request for my IPv4 address (%s)\n",
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adapter->ipv4_address().to_string().characters());
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ARPPacket response;
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response.set_operation(ARPOperation::Response);
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response.set_target_hardware_address(packet.sender_hardware_address());
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response.set_target_protocol_address(packet.sender_protocol_address());
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response.set_sender_hardware_address(adapter->mac_address());
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response.set_sender_protocol_address(adapter->ipv4_address());
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adapter->send(packet.sender_hardware_address(), response);
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}
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return;
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}
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if (packet.operation() == ARPOperation::Response) {
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// Someone has this IPv4 address. I guess we can try to remember that.
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// FIXME: Protect against ARP spamming.
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// FIXME: Support static ARP table entries.
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LOCKER(arp_table().lock());
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arp_table().resource().set(packet.sender_protocol_address(), packet.sender_hardware_address());
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kprintf("ARP table (%d entries):\n", arp_table().resource().size());
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for (auto& it : arp_table().resource()) {
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kprintf("%s :: %s\n", it.value.to_string().characters(), it.key.to_string().characters());
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}
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}
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}
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void handle_ipv4(const EthernetFrameHeader& eth, size_t frame_size)
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{
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constexpr size_t minimum_ipv4_frame_size = sizeof(EthernetFrameHeader) + sizeof(IPv4Packet);
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if (frame_size < minimum_ipv4_frame_size) {
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kprintf("handle_ipv4: Frame too small (%d, need %d)\n", frame_size, minimum_ipv4_frame_size);
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return;
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}
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auto& packet = *static_cast<const IPv4Packet*>(eth.payload());
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if (packet.length() < sizeof(IPv4Packet)) {
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kprintf("handle_ipv4: IPv4 packet too short (%u, need %u)\n", packet.length(), sizeof(IPv4Packet));
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return;
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}
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size_t actual_ipv4_packet_length = frame_size - sizeof(EthernetFrameHeader);
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if (packet.length() > actual_ipv4_packet_length) {
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kprintf("handle_ipv4: IPv4 packet claims to be longer than it is (%u, actually %zu)\n", packet.length(), actual_ipv4_packet_length);
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return;
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}
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#ifdef IPV4_DEBUG
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kprintf("handle_ipv4: source=%s, target=%s\n",
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packet.source().to_string().characters(),
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packet.destination().to_string().characters());
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#endif
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switch ((IPv4Protocol)packet.protocol()) {
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case IPv4Protocol::ICMP:
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return handle_icmp(eth, packet);
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case IPv4Protocol::UDP:
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return handle_udp(packet);
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case IPv4Protocol::TCP:
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return handle_tcp(packet);
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default:
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kprintf("handle_ipv4: Unhandled protocol %u\n", packet.protocol());
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break;
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}
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}
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void handle_icmp(const EthernetFrameHeader& eth, const IPv4Packet& ipv4_packet)
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{
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auto& icmp_header = *static_cast<const ICMPHeader*>(ipv4_packet.payload());
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#ifdef ICMP_DEBUG
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kprintf("handle_icmp: source=%s, destination=%s, type=%b, code=%b\n",
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ipv4_packet.source().to_string().characters(),
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ipv4_packet.destination().to_string().characters(),
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icmp_header.type(),
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icmp_header.code());
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#endif
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{
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LOCKER(IPv4Socket::all_sockets().lock());
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for (RefPtr<IPv4Socket> socket : IPv4Socket::all_sockets().resource()) {
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LOCKER(socket->lock());
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if (socket->protocol() != (unsigned)IPv4Protocol::ICMP)
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continue;
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socket->did_receive(ipv4_packet.source(), 0, KBuffer::copy(&ipv4_packet, sizeof(IPv4Packet) + ipv4_packet.payload_size()));
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}
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}
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auto adapter = NetworkAdapter::from_ipv4_address(ipv4_packet.destination());
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if (!adapter)
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return;
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if (icmp_header.type() == ICMPType::EchoRequest) {
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auto& request = reinterpret_cast<const ICMPEchoPacket&>(icmp_header);
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kprintf("handle_icmp: EchoRequest from %s: id=%u, seq=%u\n",
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ipv4_packet.source().to_string().characters(),
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(u16)request.identifier,
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(u16)request.sequence_number);
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size_t icmp_packet_size = ipv4_packet.payload_size();
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auto buffer = ByteBuffer::create_zeroed(icmp_packet_size);
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auto& response = *(ICMPEchoPacket*)buffer.pointer();
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response.header.set_type(ICMPType::EchoReply);
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response.header.set_code(0);
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response.identifier = request.identifier;
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response.sequence_number = request.sequence_number;
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if (size_t icmp_payload_size = icmp_packet_size - sizeof(ICMPEchoPacket))
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memcpy(response.payload(), request.payload(), icmp_payload_size);
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response.header.set_checksum(internet_checksum(&response, icmp_packet_size));
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adapter->send_ipv4(eth.source(), ipv4_packet.source(), IPv4Protocol::ICMP, buffer.data(), buffer.size());
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}
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}
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void handle_udp(const IPv4Packet& ipv4_packet)
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{
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if (ipv4_packet.payload_size() < sizeof(UDPPacket)) {
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kprintf("handle_udp: Packet too small (%u, need %zu)\n", ipv4_packet.payload_size());
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return;
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}
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auto adapter = NetworkAdapter::from_ipv4_address(ipv4_packet.destination());
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if (!adapter) {
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kprintf("handle_udp: this packet is not for me, it's for %s\n", ipv4_packet.destination().to_string().characters());
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return;
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}
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auto& udp_packet = *static_cast<const UDPPacket*>(ipv4_packet.payload());
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#ifdef UDP_DEBUG
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kprintf("handle_udp: source=%s:%u, destination=%s:%u length=%u\n",
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ipv4_packet.source().to_string().characters(),
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udp_packet.source_port(),
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ipv4_packet.destination().to_string().characters(),
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udp_packet.destination_port(),
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udp_packet.length());
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#endif
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auto socket = UDPSocket::from_port(udp_packet.destination_port());
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if (!socket) {
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kprintf("handle_udp: No UDP socket for port %u\n", udp_packet.destination_port());
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return;
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}
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ASSERT(socket->type() == SOCK_DGRAM);
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ASSERT(socket->local_port() == udp_packet.destination_port());
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socket->did_receive(ipv4_packet.source(), udp_packet.source_port(), KBuffer::copy(&ipv4_packet, sizeof(IPv4Packet) + ipv4_packet.payload_size()));
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}
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void handle_tcp(const IPv4Packet& ipv4_packet)
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{
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if (ipv4_packet.payload_size() < sizeof(TCPPacket)) {
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kprintf("handle_tcp: IPv4 payload is too small to be a TCP packet (%u, need %zu)\n", ipv4_packet.payload_size(), sizeof(TCPPacket));
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return;
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}
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auto& tcp_packet = *static_cast<const TCPPacket*>(ipv4_packet.payload());
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size_t minimum_tcp_header_size = 5 * sizeof(u32);
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size_t maximum_tcp_header_size = 15 * sizeof(u32);
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if (tcp_packet.header_size() < minimum_tcp_header_size || tcp_packet.header_size() > maximum_tcp_header_size) {
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kprintf("handle_tcp: TCP packet header has invalid size %zu\n", tcp_packet.header_size());
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}
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if (ipv4_packet.payload_size() < tcp_packet.header_size()) {
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kprintf("handle_tcp: IPv4 payload is smaller than TCP header claims (%u, supposedly %u)\n", ipv4_packet.payload_size(), tcp_packet.header_size());
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return;
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}
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size_t payload_size = ipv4_packet.payload_size() - tcp_packet.header_size();
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#ifdef TCP_DEBUG
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kprintf("handle_tcp: source=%s:%u, destination=%s:%u seq_no=%u, ack_no=%u, flags=%w (%s%s%s%s), window_size=%u, payload_size=%u\n",
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ipv4_packet.source().to_string().characters(),
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tcp_packet.source_port(),
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ipv4_packet.destination().to_string().characters(),
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tcp_packet.destination_port(),
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tcp_packet.sequence_number(),
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tcp_packet.ack_number(),
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tcp_packet.flags(),
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tcp_packet.has_syn() ? "SYN " : "",
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tcp_packet.has_ack() ? "ACK " : "",
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tcp_packet.has_fin() ? "FIN " : "",
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tcp_packet.has_rst() ? "RST " : "",
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tcp_packet.window_size(),
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payload_size);
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#endif
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auto adapter = NetworkAdapter::from_ipv4_address(ipv4_packet.destination());
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if (!adapter) {
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kprintf("handle_tcp: this packet is not for me, it's for %s\n", ipv4_packet.destination().to_string().characters());
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return;
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}
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IPv4SocketTuple tuple(ipv4_packet.destination(), tcp_packet.destination_port(), ipv4_packet.source(), tcp_packet.source_port());
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#ifdef TCP_DEBUG
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kprintf("handle_tcp: looking for socket; tuple=%s\n", tuple.to_string().characters());
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#endif
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auto socket = TCPSocket::from_tuple(tuple);
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if (!socket) {
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kprintf("handle_tcp: No TCP socket for tuple %s\n", tuple.to_string().characters());
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return;
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}
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ASSERT(socket->type() == SOCK_STREAM);
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ASSERT(socket->local_port() == tcp_packet.destination_port());
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#ifdef TCP_DEBUG
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kprintf("handle_tcp: got socket; state=%s\n", socket->tuple().to_string().characters(), TCPSocket::to_string(socket->state()));
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#endif
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if (tcp_packet.ack_number() != socket->sequence_number()) {
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kprintf("handle_tcp: ack/seq mismatch: got %u, wanted %u\n", tcp_packet.ack_number(), socket->sequence_number());
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return;
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}
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socket->record_incoming_data(ipv4_packet.payload_size());
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switch (socket->state()) {
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case TCPSocket::State::Closed:
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kprintf("handle_tcp: unexpected flags in Closed state\n");
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// TODO: we may want to send an RST here, maybe as a configurable option
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return;
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case TCPSocket::State::TimeWait:
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kprintf("handle_tcp: unexpected flags in TimeWait state\n");
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socket->send_tcp_packet(TCPFlags::RST);
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socket->set_state(TCPSocket::State::Closed);
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return;
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case TCPSocket::State::Listen:
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switch (tcp_packet.flags()) {
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case TCPFlags::SYN: {
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kprintf("handle_tcp: incoming connection\n");
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auto& local_address = ipv4_packet.destination();
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auto& peer_address = ipv4_packet.source();
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auto client = socket->create_client(local_address, tcp_packet.destination_port(), peer_address, tcp_packet.source_port());
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if (!client) {
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kprintf("handle_tcp: couldn't create client socket\n");
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return;
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}
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kprintf("handle_tcp: created new client socket with tuple %s\n", client->tuple().to_string().characters());
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client->set_sequence_number(1000);
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client->set_ack_number(tcp_packet.sequence_number() + payload_size + 1);
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client->send_tcp_packet(TCPFlags::SYN | TCPFlags::ACK);
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client->set_sequence_number(1001);
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client->set_state(TCPSocket::State::SynReceived);
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return;
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}
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default:
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kprintf("handle_tcp: unexpected flags in Listen state\n");
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// socket->send_tcp_packet(TCPFlags::RST);
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return;
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}
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case TCPSocket::State::SynSent:
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switch (tcp_packet.flags()) {
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case TCPFlags::SYN:
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socket->set_ack_number(tcp_packet.sequence_number() + payload_size + 1);
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socket->send_tcp_packet(TCPFlags::ACK);
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socket->set_state(TCPSocket::State::SynReceived);
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return;
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case TCPFlags::ACK | TCPFlags::SYN:
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socket->set_ack_number(tcp_packet.sequence_number() + payload_size + 1);
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socket->send_tcp_packet(TCPFlags::ACK);
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socket->set_state(TCPSocket::State::Established);
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socket->set_setup_state(Socket::SetupState::Completed);
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socket->set_connected(true);
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return;
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case TCPFlags::ACK | TCPFlags::FIN:
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socket->set_ack_number(tcp_packet.sequence_number() + payload_size + 1);
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socket->send_tcp_packet(TCPFlags::ACK);
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socket->set_state(TCPSocket::State::Closed);
|
|
socket->set_error(TCPSocket::Error::FINDuringConnect);
|
|
socket->set_setup_state(Socket::SetupState::Completed);
|
|
return;
|
|
case TCPFlags::ACK | TCPFlags::RST:
|
|
socket->set_ack_number(tcp_packet.sequence_number() + payload_size + 1);
|
|
socket->send_tcp_packet(TCPFlags::ACK);
|
|
socket->set_state(TCPSocket::State::Closed);
|
|
socket->set_error(TCPSocket::Error::RSTDuringConnect);
|
|
socket->set_setup_state(Socket::SetupState::Completed);
|
|
return;
|
|
default:
|
|
kprintf("handle_tcp: unexpected flags in SynSent state\n");
|
|
socket->send_tcp_packet(TCPFlags::RST);
|
|
socket->set_state(TCPSocket::State::Closed);
|
|
socket->set_error(TCPSocket::Error::UnexpectedFlagsDuringConnect);
|
|
socket->set_setup_state(Socket::SetupState::Completed);
|
|
return;
|
|
}
|
|
case TCPSocket::State::SynReceived:
|
|
switch (tcp_packet.flags()) {
|
|
case TCPFlags::ACK:
|
|
socket->set_ack_number(tcp_packet.sequence_number() + payload_size + 1);
|
|
socket->set_state(TCPSocket::State::Established);
|
|
if (socket->direction() == TCPSocket::Direction::Outgoing) {
|
|
socket->set_setup_state(Socket::SetupState::Completed);
|
|
socket->set_connected(true);
|
|
}
|
|
return;
|
|
default:
|
|
kprintf("handle_tcp: unexpected flags in SynReceived state\n");
|
|
socket->send_tcp_packet(TCPFlags::RST);
|
|
socket->set_state(TCPSocket::State::Closed);
|
|
return;
|
|
}
|
|
case TCPSocket::State::CloseWait:
|
|
switch (tcp_packet.flags()) {
|
|
default:
|
|
kprintf("handle_tcp: unexpected flags in CloseWait state\n");
|
|
socket->send_tcp_packet(TCPFlags::RST);
|
|
socket->set_state(TCPSocket::State::Closed);
|
|
return;
|
|
}
|
|
case TCPSocket::State::LastAck:
|
|
switch (tcp_packet.flags()) {
|
|
case TCPFlags::ACK:
|
|
socket->set_ack_number(tcp_packet.sequence_number() + payload_size + 1);
|
|
socket->set_state(TCPSocket::State::Closed);
|
|
return;
|
|
default:
|
|
kprintf("handle_tcp: unexpected flags in LastAck state\n");
|
|
socket->send_tcp_packet(TCPFlags::RST);
|
|
socket->set_state(TCPSocket::State::Closed);
|
|
return;
|
|
}
|
|
case TCPSocket::State::FinWait1:
|
|
switch (tcp_packet.flags()) {
|
|
case TCPFlags::ACK:
|
|
socket->set_ack_number(tcp_packet.sequence_number() + payload_size + 1);
|
|
socket->set_state(TCPSocket::State::FinWait2);
|
|
return;
|
|
case TCPFlags::FIN:
|
|
socket->set_ack_number(tcp_packet.sequence_number() + payload_size + 1);
|
|
socket->set_state(TCPSocket::State::Closing);
|
|
return;
|
|
default:
|
|
kprintf("handle_tcp: unexpected flags in FinWait1 state\n");
|
|
socket->send_tcp_packet(TCPFlags::RST);
|
|
socket->set_state(TCPSocket::State::Closed);
|
|
return;
|
|
}
|
|
case TCPSocket::State::FinWait2:
|
|
switch (tcp_packet.flags()) {
|
|
case TCPFlags::FIN:
|
|
socket->set_ack_number(tcp_packet.sequence_number() + payload_size + 1);
|
|
socket->set_state(TCPSocket::State::TimeWait);
|
|
return;
|
|
default:
|
|
kprintf("handle_tcp: unexpected flags in FinWait2 state\n");
|
|
socket->send_tcp_packet(TCPFlags::RST);
|
|
socket->set_state(TCPSocket::State::Closed);
|
|
return;
|
|
}
|
|
case TCPSocket::State::Closing:
|
|
switch (tcp_packet.flags()) {
|
|
case TCPFlags::ACK:
|
|
socket->set_ack_number(tcp_packet.sequence_number() + payload_size + 1);
|
|
socket->set_state(TCPSocket::State::TimeWait);
|
|
return;
|
|
default:
|
|
kprintf("handle_tcp: unexpected flags in Closing state\n");
|
|
socket->send_tcp_packet(TCPFlags::RST);
|
|
socket->set_state(TCPSocket::State::Closed);
|
|
return;
|
|
}
|
|
case TCPSocket::State::Established:
|
|
if (tcp_packet.has_fin()) {
|
|
if (payload_size != 0)
|
|
socket->did_receive(ipv4_packet.source(), tcp_packet.source_port(), KBuffer::copy(&ipv4_packet, sizeof(IPv4Packet) + ipv4_packet.payload_size()));
|
|
|
|
socket->set_ack_number(tcp_packet.sequence_number() + payload_size + 1);
|
|
socket->send_tcp_packet(TCPFlags::ACK);
|
|
socket->set_state(TCPSocket::State::CloseWait);
|
|
socket->set_connected(false);
|
|
return;
|
|
}
|
|
|
|
socket->set_ack_number(tcp_packet.sequence_number() + payload_size);
|
|
|
|
#ifdef TCP_DEBUG
|
|
kprintf("Got packet with ack_no=%u, seq_no=%u, payload_size=%u, acking it with new ack_no=%u, seq_no=%u\n",
|
|
tcp_packet.ack_number(),
|
|
tcp_packet.sequence_number(),
|
|
payload_size,
|
|
socket->ack_number(),
|
|
socket->sequence_number());
|
|
#endif
|
|
|
|
socket->send_tcp_packet(TCPFlags::ACK);
|
|
|
|
if (payload_size != 0)
|
|
socket->did_receive(ipv4_packet.source(), tcp_packet.source_port(), KBuffer::copy(&ipv4_packet, sizeof(IPv4Packet) + ipv4_packet.payload_size()));
|
|
}
|
|
}
|