mirror of
https://github.com/wichtounet/thor-os.git
synced 2025-08-03 17:26:08 -04:00
Delete all TCP work to the TCP layer
This commit is contained in:
Baptiste Wicht
parent
f55de06866
commit
9d5da4769d
@ -67,6 +67,8 @@ size_t number_of_interfaces();
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interface_descriptor& interface(size_t index);
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interface_descriptor& select_interface(network::ip::address address);
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/*!
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* \brief Open a new socket
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* \param domain The socket domain
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@ -12,6 +12,7 @@
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#include <vector.hpp>
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#include <algorithms.hpp>
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#include <circular_buffer.hpp>
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#include <type_traits.hpp>
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#include "tlib/net_constants.hpp"
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@ -24,19 +25,16 @@
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namespace network {
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struct socket {
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size_t id;
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size_t id; ///< The socket file descriptor
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socket_domain domain;
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socket_type type;
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socket_protocol protocol;
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size_t next_fd;
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bool listen;
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bool connected;
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uint32_t local_port;
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uint32_t server_port;
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ip::address server_address;
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uint32_t ack_number;
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uint32_t seq_number;
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void* data = nullptr;
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uint32_t local_port; //TODO This should not be here since it belongs to UDP
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std::vector<network::ethernet::packet> packets;
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@ -90,6 +88,18 @@ struct socket {
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return packet.fd == fd;
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}), packets.end());
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}
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template<typename T>
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T& get_data(){
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thor_assert(data);
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return *reinterpret_cast<T*>(data);
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}
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template<typename T>
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std::add_const_t<T>& get_data() const {
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thor_assert(data);
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return *reinterpret_cast<std::add_const_t<T>*>(data);
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}
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};
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} // end of network namespace
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@ -22,13 +22,13 @@ namespace tcp {
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void decode(network::interface_descriptor& interface, network::ethernet::packet& packet);
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std::expected<network::ethernet::packet> prepare_packet(network::interface_descriptor& interface, network::ip::address target_ip, size_t source, size_t target, size_t payload_size);
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std::expected<network::ethernet::packet> prepare_packet(char* buffer, network::interface_descriptor& interface, network::socket& socket, size_t payload_size);
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std::expected<network::ethernet::packet> prepare_packet(char* buffer, network::socket& socket, size_t payload_size);
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void finalize_packet(network::interface_descriptor& interface, network::ethernet::packet& p);
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void finalize_packet(network::interface_descriptor& interface, network::socket& socket, network::ethernet::packet& p);
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std::expected<void> connect(network::socket& socket, network::interface_descriptor& interface);
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std::expected<void> disconnect(network::socket& socket, network::interface_descriptor& interface);
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std::expected<void> connect(network::socket& socket, network::interface_descriptor& interface, size_t local_port, size_t server_port, network::ip::address server);
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std::expected<void> disconnect(network::socket& socket);
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} // end of tcp namespace
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@ -74,26 +74,6 @@ void tx_thread(void* data){
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}
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}
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network::interface_descriptor& select_interface(network::ip::address address){
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if(address == network::ip::make_address(127, 0, 0, 1)){
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for(auto& interface : interfaces){
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if(interface.enabled && interface.is_loopback()){
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return interface;
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}
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}
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}
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// Otherwise return the first enabled interface
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for(auto& interface : interfaces){
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if(interface.enabled){
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return interface;
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}
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}
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thor_unreachable("network: Should never happen");
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}
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void sysfs_publish(const network::interface_descriptor& interface){
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auto p = path("/net") / interface.name;
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@ -232,6 +212,27 @@ network::interface_descriptor& network::interface(size_t index){
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return interfaces[index];
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}
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network::interface_descriptor& network::select_interface(network::ip::address address){
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if(address == network::ip::make_address(127, 0, 0, 1)){
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for(auto& interface : interfaces){
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if(interface.enabled && interface.is_loopback()){
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return interface;
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}
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}
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}
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// Otherwise return the first enabled interface
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for(auto& interface : interfaces){
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if(interface.enabled){
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return interface;
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}
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}
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thor_unreachable("network: Should never happen");
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}
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std::expected<network::socket_fd_t> network::open(network::socket_domain domain, network::socket_type type, network::socket_protocol protocol){
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// Make sure the socket domain is valid
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if(domain != socket_domain::AF_INET){
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@ -258,15 +259,7 @@ std::expected<network::socket_fd_t> network::open(network::socket_domain domain,
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return std::make_expected_from_error<network::socket_fd_t>(std::ERROR_SOCKET_INVALID_TYPE_PROTOCOL);
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}
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auto socket_fd = scheduler::register_new_socket(domain, type, protocol);
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// Initialize TCP connection values
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auto& socket = scheduler::get_socket(socket_fd);
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socket.connected = false;
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socket.local_port = 0;
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socket.server_port = 0;
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return socket_fd;
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return scheduler::register_new_socket(domain, type, protocol);
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}
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void network::close(size_t fd){
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@ -286,11 +279,6 @@ std::tuple<size_t, size_t> network::prepare_packet(socket_fd_t socket_fd, void*
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auto& socket = scheduler::get_socket(socket_fd);
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// Make sure stream sockets are connected
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if(socket.type == socket_type::STREAM && !socket.connected){
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return {-std::ERROR_SOCKET_NOT_CONNECTED, 0};
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}
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auto return_from_packet = [&socket](std::expected<network::ethernet::packet>& packet) -> std::tuple<size_t, size_t> {
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if (packet) {
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auto fd = socket.register_packet(*packet);
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@ -320,8 +308,7 @@ std::tuple<size_t, size_t> network::prepare_packet(socket_fd_t socket_fd, void*
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case network::socket_protocol::TCP: {
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auto descriptor = static_cast<network::tcp::packet_descriptor*>(desc);
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auto& interface = select_interface(socket.server_address);
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auto packet = network::tcp::prepare_packet(buffer, interface, socket, descriptor->payload_size);
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auto packet = network::tcp::prepare_packet(buffer, socket, descriptor->payload_size);
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return return_from_packet(packet);
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}
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@ -355,11 +342,6 @@ std::expected<void> network::finalize_packet(socket_fd_t socket_fd, size_t packe
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return std::make_unexpected<void>(std::ERROR_SOCKET_INVALID_PACKET_FD);
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}
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// Make sure stream sockets are connected
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if(socket.type == socket_type::STREAM && !socket.connected){
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return std::make_unexpected<void>(-std::ERROR_SOCKET_NOT_CONNECTED);
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}
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auto& packet = socket.get_packet(packet_fd);
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auto& interface = network::interface(packet.interface);
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@ -427,25 +409,21 @@ std::expected<size_t> network::connect(socket_fd_t socket_fd, network::ip::addre
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return std::make_unexpected<size_t>(std::ERROR_SOCKET_INVALID_TYPE);
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}
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socket.local_port = local_port++;
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socket.server_port = port;
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socket.server_address = server;
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auto selected_port = local_port++;
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logging::logf(logging::log_level::TRACE, "network: %u stream socket %u was assigned port %u\n", scheduler::get_pid(), socket_fd, socket.local_port);
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if(socket.protocol == socket_protocol::TCP){
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auto connection = network::tcp::connect(socket, select_interface(server));
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auto connection = network::tcp::connect(socket, select_interface(server), selected_port, port, server);
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if(connection){
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socket.connected = true;
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} else {
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if(!connection){
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return std::make_unexpected<size_t>(connection.error());
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}
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} else {
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return std::make_unexpected<size_t>(std::ERROR_SOCKET_INVALID_TYPE_PROTOCOL);
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}
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return std::make_expected<size_t>(socket.local_port);
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return std::make_expected<size_t>(selected_port);
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}
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std::expected<void> network::disconnect(socket_fd_t socket_fd){
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@ -459,18 +437,12 @@ std::expected<void> network::disconnect(socket_fd_t socket_fd){
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return std::make_unexpected<void>(std::ERROR_SOCKET_INVALID_TYPE);
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}
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if(!socket.connected){
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return std::make_unexpected<void>(std::ERROR_SOCKET_NOT_CONNECTED);
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}
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logging::logf(logging::log_level::TRACE, "network: %u disconnect from stream socket %u\n", scheduler::get_pid(), socket_fd);
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if(socket.protocol == socket_protocol::TCP){
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auto disconnection = network::tcp::disconnect(socket, select_interface(socket.server_address));
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auto disconnection = network::tcp::disconnect(socket);
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if(disconnection){
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socket.connected = false;
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} else {
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if(!disconnection){
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return std::make_unexpected<void>(disconnection.error());
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}
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} else {
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@ -567,30 +539,10 @@ void network::propagate_packet(const ethernet::packet& packet, socket_protocol p
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propagate = true;
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}
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}
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} else if(socket.type == socket_type::STREAM){
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if(socket.protocol == protocol && socket.connected){
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auto local_port = socket.local_port;
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auto server_port = socket.server_port;
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auto tcp_index = packet.tag(2);
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auto* tcp_header = reinterpret_cast<network::tcp::header*>(packet.payload + tcp_index);
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auto source_port = switch_endian_16(tcp_header->source_port);
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auto target_port = switch_endian_16(tcp_header->target_port);
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auto flags = switch_endian_16(tcp_header->flags);
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using flag_psh = std::bit_field<uint16_t, uint8_t, 3, 1>;
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// Don't propagate ack
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if (*flag_psh(&flags)) {
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logging::logf(logging::log_level::TRACE, "network: propagate on socket %u\n", socket.id);
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if(local_port == target_port && server_port == source_port){
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propagate = true;
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}
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}
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}
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}
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// Note: Stream sockets are responsible for propagation
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if (propagate) {
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auto copy = packet;
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copy.payload = new char[copy.payload_size];
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@ -40,17 +40,20 @@ using flag_syn = std::bit_field<uint16_t, uint8_t, 1, 1>;
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using flag_fin = std::bit_field<uint16_t, uint8_t, 0, 1>;
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struct tcp_connection {
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size_t source_port; ///< The source port of the connection
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size_t target_port; ///< The target port of the connection
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size_t local_port; ///< The local source port
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size_t server_port; ///< The server port
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network::ip::address server_address; ///< The server address
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std::atomic<bool> listening; ///< Indicates if a kernel thread is listening on this connection
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condition_variable queue; ///< The listening queue
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circular_buffer<network::ethernet::packet, 8> packets; ///< The packets for the listening queue
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tcp_connection(size_t source_port, size_t target_port)
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: source_port(source_port), target_port(target_port), listening(false) {
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//Nothing else to init
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}
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bool connected = false;
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uint32_t ack_number = 0; ///< The next ack number
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uint32_t seq_number = 0; ///< The next sequence number
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network::socket* socket = nullptr;
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};
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// The lock used to protect the list of connections
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@ -59,12 +62,12 @@ rw_lock connections_lock;
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// Note: We need a list to not invalidate the values during insertions
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std::list<tcp_connection> connections;
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tcp_connection* get_connection(size_t source_port, size_t target_port) {
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tcp_connection* get_connection_for_packet(size_t source_port, size_t target_port) {
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auto lock = connections_lock.reader_lock();
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std::lock_guard<reader_rw_lock> l(lock);
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for(auto& connection : connections){
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if (connection.source_port == source_port && connection.target_port == target_port) {
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if (connection.server_port == source_port && connection.local_port == target_port) {
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return &connection;
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}
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}
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@ -72,11 +75,15 @@ tcp_connection* get_connection(size_t source_port, size_t target_port) {
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return nullptr;
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}
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tcp_connection& create_connection(size_t target, size_t source){
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tcp_connection& create_connection(){
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auto lock = connections_lock.writer_lock();
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std::lock_guard<writer_rw_lock> l(lock);
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return connections.emplace_back(target, source);
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auto& connection = connections.emplace_back();
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connection.listening = false;
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return connection;
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}
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void remove_connection(tcp_connection& connection){
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@ -178,14 +185,22 @@ void network::tcp::decode(network::interface_descriptor& interface, network::eth
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auto flags = switch_endian_16(tcp_header->flags);
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auto next_seq = ack;
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auto next_ack = seq + tcp_payload_len(packet);;
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auto connection_ptr = get_connection_for_packet(source_port, target_port);
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if(connection_ptr){
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auto& connection = *connection_ptr;
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// Update the connection status
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connection.seq_number = next_seq;
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connection.ack_number = next_ack;
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// Propagate to kernel connections
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{
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auto lock = connections_lock.reader_lock();
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std::lock_guard<reader_rw_lock> l(lock);
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for (auto& connection : connections) {
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if (connection.listening.load() && connection.source_port == source_port && connection.target_port == target_port) {
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if (connection.listening.load()) {
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auto copy = packet;
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copy.payload = new char[copy.payload_size];
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std::copy_n(packet.payload, packet.payload_size, copy.payload);
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@ -193,20 +208,29 @@ void network::tcp::decode(network::interface_descriptor& interface, network::eth
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connection.packets.push(copy);
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connection.queue.notify_one();
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}
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}
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}
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auto seq_number = ack;
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auto ack_number = seq + tcp_payload_len(packet);
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// Propagate to the kernel socket
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//TODO socket.seq_number = ack;
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//TODO socket.ack_number = seq + tcp_payload_len(packet);
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if (*flag_psh(&flags) && connection.socket) {
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auto& socket = *connection.socket;
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packet.index += sizeof(header);
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network::propagate_packet(packet, network::socket_protocol::TCP);
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if (socket.listen) {
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auto copy = packet;
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copy.payload = new char[copy.payload_size];
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std::copy_n(packet.payload, packet.payload_size, copy.payload);
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socket.listen_packets.push(copy);
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socket.listen_queue.notify_one();
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}
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}
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} else {
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logging::logf(logging::log_level::DEBUG, "tcp: Received packet for which there are no connection\n");
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}
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// Acknowledge if necessary
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// A push needs to be acknowledged
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if (*flag_psh(&flags)) {
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auto p = tcp::prepare_packet(interface, switch_endian_32(ip_header->source_ip), target_port, source_port, 0);
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@ -217,12 +241,12 @@ void network::tcp::decode(network::interface_descriptor& interface, network::eth
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auto* ack_tcp_header = reinterpret_cast<header*>(p->payload + p->tag(2));
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ack_tcp_header->sequence_number = switch_endian_32(seq_number);
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ack_tcp_header->ack_number = switch_endian_32(ack_number);
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ack_tcp_header->sequence_number = switch_endian_32(next_seq);
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ack_tcp_header->ack_number = switch_endian_32(next_ack);
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auto flags = get_default_flags();
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(flag_ack(&flags)) = 1;
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ack_tcp_header->flags = switch_endian_16(flags);
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auto ack_flags = get_default_flags();
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(flag_ack(&ack_flags)) = 1;
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ack_tcp_header->flags = switch_endian_16(ack_flags);
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tcp::finalize_packet(interface, *p);
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}
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@ -239,15 +263,23 @@ std::expected<network::ethernet::packet> network::tcp::prepare_packet(network::i
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return packet;
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}
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std::expected<network::ethernet::packet> network::tcp::prepare_packet(char* buffer, network::interface_descriptor& interface, network::socket& socket, size_t payload_size) {
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auto target_ip = socket.server_address;
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std::expected<network::ethernet::packet> network::tcp::prepare_packet(char* buffer, network::socket& socket, size_t payload_size) {
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auto& connection = socket.get_data<tcp_connection>();
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// Make sure stream sockets are connected
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if(!connection.connected){
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return std::make_unexpected<network::ethernet::packet>(std::ERROR_SOCKET_NOT_CONNECTED);
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}
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auto target_ip = connection.server_address;
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auto& interface = network::select_interface(target_ip);
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// Ask the IP layer to craft a packet
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auto packet = network::ip::prepare_packet(buffer, interface, sizeof(header) + payload_size, target_ip, 0x06);
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if (packet) {
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auto source = socket.local_port;
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auto target = socket.server_port;
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auto source = connection.local_port;
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auto target = connection.server_port;
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::prepare_packet(*packet, source, target);
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@ -258,8 +290,8 @@ std::expected<network::ethernet::packet> network::tcp::prepare_packet(char* buff
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(flag_ack(&flags)) = 1;
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tcp_header->flags = switch_endian_16(flags);
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tcp_header->sequence_number = switch_endian_32(socket.seq_number);
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tcp_header->ack_number = switch_endian_32(socket.ack_number);
|
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tcp_header->sequence_number = switch_endian_32(connection.seq_number);
|
||||
tcp_header->ack_number = switch_endian_32(connection.ack_number);
|
||||
}
|
||||
|
||||
return packet;
|
||||
@ -286,18 +318,14 @@ void network::tcp::finalize_packet(network::interface_descriptor& interface, net
|
||||
return; //TODO Fail
|
||||
}
|
||||
|
||||
auto source = socket.local_port;
|
||||
auto target = socket.server_port;
|
||||
auto& connection = socket.get_data<tcp_connection>();
|
||||
|
||||
auto connection_ptr = get_connection(target, source);
|
||||
|
||||
if (!connection_ptr) {
|
||||
logging::logf(logging::log_level::ERROR, "tcp: Unable to find connection!\n");
|
||||
return; //TODO Fail
|
||||
// Make sure stream sockets are connected
|
||||
if(!connection.connected){
|
||||
//TODO return std::make_unexpected<void>(std::ERROR_SOCKET_NOT_CONNECTED);
|
||||
return;
|
||||
}
|
||||
|
||||
auto& connection = *connection_ptr;
|
||||
|
||||
connection.listening = true;
|
||||
|
||||
uint32_t seq = 0;
|
||||
@ -357,22 +385,31 @@ void network::tcp::finalize_packet(network::interface_descriptor& interface, net
|
||||
|
||||
if(received){
|
||||
// Set the future sequence and acknowledgement numbers
|
||||
socket.seq_number = ack;
|
||||
socket.ack_number = seq;
|
||||
connection.seq_number = ack;
|
||||
connection.ack_number = seq;
|
||||
} else {
|
||||
//TODO We need to be able to make finalize fail!
|
||||
}
|
||||
}
|
||||
|
||||
std::expected<void> network::tcp::connect(network::socket& sock, network::interface_descriptor& interface) {
|
||||
auto target_ip = sock.server_address;
|
||||
auto source = sock.local_port;
|
||||
auto target = sock.server_port;
|
||||
std::expected<void> network::tcp::connect(network::socket& sock, network::interface_descriptor& interface, size_t local_port, size_t server_port, network::ip::address server) {
|
||||
// Create the connection
|
||||
|
||||
sock.seq_number = 0;
|
||||
sock.ack_number = 0;
|
||||
auto& connection = create_connection();
|
||||
|
||||
auto packet = tcp::prepare_packet(interface, target_ip, source, target, 0);
|
||||
connection.local_port = local_port;
|
||||
connection.server_port = server_port;
|
||||
connection.server_address = server;
|
||||
|
||||
// Link the socket and connection
|
||||
sock.data = &connection;
|
||||
connection.socket = &sock;
|
||||
|
||||
// Prepare the SYN packet
|
||||
|
||||
auto target_ip = connection.server_address;
|
||||
|
||||
auto packet = tcp::prepare_packet(interface, target_ip, local_port, server_port, 0);
|
||||
|
||||
if (!packet) {
|
||||
return std::make_unexpected<void>(packet.error());
|
||||
@ -380,16 +417,12 @@ std::expected<void> network::tcp::connect(network::socket& sock, network::interf
|
||||
|
||||
auto* tcp_header = reinterpret_cast<header*>(packet->payload + packet->tag(2));
|
||||
|
||||
tcp_header->sequence_number = 0;
|
||||
tcp_header->ack_number = 0;
|
||||
|
||||
auto flags = get_default_flags();
|
||||
(flag_syn(&flags)) = 1;
|
||||
tcp_header->flags = switch_endian_16(flags);
|
||||
|
||||
// Create the connection
|
||||
|
||||
auto& connection = create_connection(target, source);
|
||||
tcp_header->sequence_number = connection.seq_number;
|
||||
tcp_header->ack_number = connection.ack_number;
|
||||
|
||||
connection.listening = true;
|
||||
|
||||
@ -425,13 +458,13 @@ std::expected<void> network::tcp::connect(network::socket& sock, network::interf
|
||||
|
||||
connection.listening = false;
|
||||
|
||||
sock.seq_number = ack;
|
||||
sock.ack_number = seq + 1;
|
||||
connection.seq_number = ack;
|
||||
connection.ack_number = seq + 1;
|
||||
|
||||
// At this point we have received the SYN/ACK, only remains to ACK
|
||||
|
||||
{
|
||||
auto packet = tcp::prepare_packet(interface, target_ip, source, target, 0);
|
||||
auto packet = tcp::prepare_packet(interface, target_ip, connection.local_port, connection.server_port, 0);
|
||||
|
||||
if (!packet) {
|
||||
return std::make_unexpected<void>(packet.error());
|
||||
@ -439,8 +472,8 @@ std::expected<void> network::tcp::connect(network::socket& sock, network::interf
|
||||
|
||||
auto* tcp_header = reinterpret_cast<header*>(packet->payload + packet->tag(2));
|
||||
|
||||
tcp_header->sequence_number = switch_endian_32(sock.seq_number);
|
||||
tcp_header->ack_number = switch_endian_32(sock.ack_number);
|
||||
tcp_header->sequence_number = switch_endian_32(connection.seq_number);
|
||||
tcp_header->ack_number = switch_endian_32(connection.ack_number);
|
||||
|
||||
auto flags = get_default_flags();
|
||||
(flag_ack(&flags)) = 1;
|
||||
@ -450,13 +483,25 @@ std::expected<void> network::tcp::connect(network::socket& sock, network::interf
|
||||
tcp::finalize_packet(interface, *packet);
|
||||
}
|
||||
|
||||
// Mark the connection as connected
|
||||
|
||||
connection.connected = true;
|
||||
|
||||
return {};
|
||||
}
|
||||
|
||||
std::expected<void> network::tcp::disconnect(network::socket& sock, network::interface_descriptor& interface) {
|
||||
auto target_ip = sock.server_address;
|
||||
auto source = sock.local_port;
|
||||
auto target = sock.server_port;
|
||||
std::expected<void> network::tcp::disconnect(network::socket& sock) {
|
||||
auto& connection = sock.get_data<tcp_connection>();
|
||||
|
||||
if(!connection.connected){
|
||||
return std::make_unexpected<void>(std::ERROR_SOCKET_NOT_CONNECTED);
|
||||
}
|
||||
|
||||
auto target_ip = connection.server_address;
|
||||
auto source = connection.local_port;
|
||||
auto target = connection.server_port;
|
||||
|
||||
auto& interface = network::select_interface(target_ip);
|
||||
|
||||
auto packet = tcp::prepare_packet(interface, target_ip, source, target, 0);
|
||||
|
||||
@ -466,23 +511,14 @@ std::expected<void> network::tcp::disconnect(network::socket& sock, network::int
|
||||
|
||||
auto* tcp_header = reinterpret_cast<header*>(packet->payload + packet->tag(2));
|
||||
|
||||
tcp_header->sequence_number = switch_endian_32(sock.seq_number);
|
||||
tcp_header->ack_number = switch_endian_32(sock.ack_number);
|
||||
tcp_header->sequence_number = switch_endian_32(connection.seq_number);
|
||||
tcp_header->ack_number = switch_endian_32(connection.ack_number);
|
||||
|
||||
auto flags = get_default_flags();
|
||||
(flag_fin(&flags)) = 1;
|
||||
(flag_ack(&flags)) = 1;
|
||||
tcp_header->flags = switch_endian_16(flags);
|
||||
|
||||
auto connection_ptr = get_connection(target, source);
|
||||
|
||||
if (!connection_ptr) {
|
||||
logging::logf(logging::log_level::ERROR, "tcp: Unable to find connection!\n");
|
||||
return std::make_unexpected<void>(std::ERROR_SOCKET_INVALID_CONNECTION);
|
||||
}
|
||||
|
||||
auto& connection = *connection_ptr;
|
||||
|
||||
connection.listening = true;
|
||||
|
||||
logging::logf(logging::log_level::TRACE, "tcp: Send FIN/ACK\n");
|
||||
@ -529,8 +565,8 @@ std::expected<void> network::tcp::disconnect(network::socket& sock, network::int
|
||||
|
||||
connection.listening = false;
|
||||
|
||||
sock.seq_number = ack;
|
||||
sock.ack_number = seq + 1;
|
||||
connection.seq_number = ack;
|
||||
connection.ack_number = seq + 1;
|
||||
|
||||
// At this point we have received the FIN/ACK, only remains to ACK
|
||||
|
||||
@ -543,8 +579,8 @@ std::expected<void> network::tcp::disconnect(network::socket& sock, network::int
|
||||
|
||||
auto* tcp_header = reinterpret_cast<header*>(packet->payload + packet->tag(2));
|
||||
|
||||
tcp_header->sequence_number = switch_endian_32(sock.seq_number);
|
||||
tcp_header->ack_number = switch_endian_32(sock.ack_number);
|
||||
tcp_header->sequence_number = switch_endian_32(connection.seq_number);
|
||||
tcp_header->ack_number = switch_endian_32(connection.ack_number);
|
||||
|
||||
auto flags = get_default_flags();
|
||||
(flag_ack(&flags)) = 1;
|
||||
@ -554,6 +590,10 @@ std::expected<void> network::tcp::disconnect(network::socket& sock, network::int
|
||||
tcp::finalize_packet(interface, *packet);
|
||||
}
|
||||
|
||||
// Mark the connection as connected
|
||||
|
||||
connection.connected = false;
|
||||
|
||||
remove_connection(connection);
|
||||
|
||||
return {};
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user