Merge pull request #8685 from FearlessTobi/multiplayer-part2

core, network: Add ability to proxy socket packets

5 files changed, 518 insertions, 100 deletions

diff --git a/src/core/internal_network/network.cpp b/src/core/internal_network/network.cpp
index 36c43cc8f..cdf38a2a4 100644
--- a/src/core/internal_network/network.cpp
+++ b/src/core/internal_network/network.cpp
@@ -32,6 +32,7 @@
 #include "core/internal_network/network.h"
 #include "core/internal_network/network_interface.h"
 #include "core/internal_network/sockets.h"
+#include "network/network.h"
 
 namespace Network {
 
@@ -114,7 +115,10 @@ Errno TranslateNativeError(int e) {
         return Errno::NETDOWN;
     case WSAENETUNREACH:
         return Errno::NETUNREACH;
+    case WSAEMSGSIZE:
+        return Errno::MSGSIZE;
     default:
+        UNIMPLEMENTED_MSG("Unimplemented errno={}", e);
         return Errno::OTHER;
     }
 }
@@ -125,7 +129,6 @@ using SOCKET = int;
 using WSAPOLLFD = pollfd;
 using ULONG = u64;
 
-constexpr SOCKET INVALID_SOCKET = -1;
 constexpr SOCKET SOCKET_ERROR = -1;
 
 constexpr int SD_RECEIVE = SHUT_RD;
@@ -206,7 +209,10 @@ Errno TranslateNativeError(int e) {
         return Errno::NETDOWN;
     case ENETUNREACH:
         return Errno::NETUNREACH;
+    case EMSGSIZE:
+        return Errno::MSGSIZE;
     default:
+        UNIMPLEMENTED_MSG("Unimplemented errno={}", e);
         return Errno::OTHER;
     }
 }
@@ -329,16 +335,6 @@ PollEvents TranslatePollRevents(short revents) {
     return result;
 }
 
-template <typename T>
-Errno SetSockOpt(SOCKET fd, int option, T value) {
-    const int result =
-        setsockopt(fd, SOL_SOCKET, option, reinterpret_cast<const char*>(&value), sizeof(value));
-    if (result != SOCKET_ERROR) {
-        return Errno::SUCCESS;
-    }
-    return GetAndLogLastError();
-}
-
 } // Anonymous namespace
 
 NetworkInstance::NetworkInstance() {
@@ -350,26 +346,16 @@ NetworkInstance::~NetworkInstance() {
 }
 
 std::optional<IPv4Address> GetHostIPv4Address() {
-    const std::string& selected_network_interface = Settings::values.network_interface.GetValue();
-    const auto network_interfaces = Network::GetAvailableNetworkInterfaces();
-    if (network_interfaces.size() == 0) {
-        LOG_ERROR(Network, "GetAvailableNetworkInterfaces returned no interfaces");
+    const auto network_interface = Network::GetSelectedNetworkInterface();
+    if (!network_interface.has_value()) {
+        LOG_ERROR(Network, "GetSelectedNetworkInterface returned no interface");
         return {};
     }
 
-    const auto res =
-        std::ranges::find_if(network_interfaces, [&selected_network_interface](const auto& iface) {
-            return iface.name == selected_network_interface;
-        });
-
-    if (res != network_interfaces.end()) {
-        char ip_addr[16] = {};
-        ASSERT(inet_ntop(AF_INET, &res->ip_address, ip_addr, sizeof(ip_addr)) != nullptr);
-        return TranslateIPv4(res->ip_address);
-    } else {
-        LOG_ERROR(Network, "Couldn't find selected interface \"{}\"", selected_network_interface);
-        return {};
-    }
+    std::array<char, 16> ip_addr = {};
+    ASSERT(inet_ntop(AF_INET, &network_interface->ip_address, ip_addr.data(), sizeof(ip_addr)) !=
+           nullptr);
+    return TranslateIPv4(network_interface->ip_address);
 }
 
 std::pair<s32, Errno> Poll(std::vector<PollFD>& pollfds, s32 timeout) {
@@ -412,7 +398,19 @@ Socket::~Socket() {
     fd = INVALID_SOCKET;
 }
 
-Socket::Socket(Socket&& rhs) noexcept : fd{std::exchange(rhs.fd, INVALID_SOCKET)} {}
+Socket::Socket(Socket&& rhs) noexcept {
+    fd = std::exchange(rhs.fd, INVALID_SOCKET);
+}
+
+template <typename T>
+Errno Socket::SetSockOpt(SOCKET fd_, int option, T value) {
+    const int result =
+        setsockopt(fd_, SOL_SOCKET, option, reinterpret_cast<const char*>(&value), sizeof(value));
+    if (result != SOCKET_ERROR) {
+        return Errno::SUCCESS;
+    }
+    return GetAndLogLastError();
+}
 
 Errno Socket::Initialize(Domain domain, Type type, Protocol protocol) {
     fd = socket(TranslateDomain(domain), TranslateType(type), TranslateProtocol(protocol));
@@ -423,7 +421,7 @@ Errno Socket::Initialize(Domain domain, Type type, Protocol protocol) {
     return GetAndLogLastError();
 }
 
-std::pair<Socket::AcceptResult, Errno> Socket::Accept() {
+std::pair<SocketBase::AcceptResult, Errno> Socket::Accept() {
     sockaddr addr;
     socklen_t addrlen = sizeof(addr);
     const SOCKET new_socket = accept(fd, &addr, &addrlen);
@@ -634,4 +632,8 @@ bool Socket::IsOpened() const {
     return fd != INVALID_SOCKET;
 }
 
+void Socket::HandleProxyPacket(const ProxyPacket& packet) {
+    LOG_WARNING(Network, "ProxyPacket received, but not in Proxy mode!");
+}
+
 } // namespace Network
diff --git a/src/core/internal_network/network.h b/src/core/internal_network/network.h
index 10e5ef10d..36994c22e 100644
--- a/src/core/internal_network/network.h
+++ b/src/core/internal_network/network.h
@@ -8,6 +8,7 @@
 
 #include "common/common_funcs.h"
 #include "common/common_types.h"
+#include "common/socket_types.h"
 
 #ifdef _WIN32
 #include <winsock2.h>
@@ -17,6 +18,7 @@
 
 namespace Network {
 
+class SocketBase;
 class Socket;
 
 /// Error code for network functions
@@ -31,46 +33,11 @@ enum class Errno {
     HOSTUNREACH,
     NETDOWN,
     NETUNREACH,
+    TIMEDOUT,
+    MSGSIZE,
     OTHER,
 };
 
-/// Address families
-enum class Domain {
-    INET, ///< Address family for IPv4
-};
-
-/// Socket types
-enum class Type {
-    STREAM,
-    DGRAM,
-    RAW,
-    SEQPACKET,
-};
-
-/// Protocol values for sockets
-enum class Protocol {
-    ICMP,
-    TCP,
-    UDP,
-};
-
-/// Shutdown mode
-enum class ShutdownHow {
-    RD,
-    WR,
-    RDWR,
-};
-
-/// Array of IPv4 address
-using IPv4Address = std::array<u8, 4>;
-
-/// Cross-platform sockaddr structure
-struct SockAddrIn {
-    Domain family;
-    IPv4Address ip;
-    u16 portno;
-};
-
 /// Cross-platform poll fd structure
 
 enum class PollEvents : u16 {
@@ -86,7 +53,7 @@ enum class PollEvents : u16 {
 DECLARE_ENUM_FLAG_OPERATORS(PollEvents);
 
 struct PollFD {
-    Socket* socket;
+    SocketBase* socket;
     PollEvents events;
     PollEvents revents;
 };
diff --git a/src/core/internal_network/socket_proxy.cpp b/src/core/internal_network/socket_proxy.cpp
new file mode 100644
index 000000000..49d067f4c
--- /dev/null
+++ b/src/core/internal_network/socket_proxy.cpp
@@ -0,0 +1,284 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <chrono>
+#include <thread>
+
+#include "common/assert.h"
+#include "common/logging/log.h"
+#include "core/internal_network/network.h"
+#include "core/internal_network/network_interface.h"
+#include "core/internal_network/socket_proxy.h"
+
+namespace Network {
+
+ProxySocket::ProxySocket(RoomNetwork& room_network_) noexcept : room_network{room_network_} {}
+
+ProxySocket::~ProxySocket() {
+    if (fd == INVALID_SOCKET) {
+        return;
+    }
+    fd = INVALID_SOCKET;
+}
+
+void ProxySocket::HandleProxyPacket(const ProxyPacket& packet) {
+    if (protocol != packet.protocol || local_endpoint.portno != packet.remote_endpoint.portno ||
+        closed) {
+        return;
+    }
+    std::lock_guard guard(packets_mutex);
+    received_packets.push(packet);
+}
+
+template <typename T>
+Errno ProxySocket::SetSockOpt(SOCKET fd_, int option, T value) {
+    LOG_DEBUG(Network, "(STUBBED) called");
+    return Errno::SUCCESS;
+}
+
+Errno ProxySocket::Initialize(Domain domain, Type type, Protocol socket_protocol) {
+    protocol = socket_protocol;
+    SetSockOpt(fd, SO_TYPE, type);
+
+    return Errno::SUCCESS;
+}
+
+std::pair<ProxySocket::AcceptResult, Errno> ProxySocket::Accept() {
+    LOG_WARNING(Network, "(STUBBED) called");
+    return {AcceptResult{}, Errno::SUCCESS};
+}
+
+Errno ProxySocket::Connect(SockAddrIn addr_in) {
+    LOG_WARNING(Network, "(STUBBED) called");
+    return Errno::SUCCESS;
+}
+
+std::pair<SockAddrIn, Errno> ProxySocket::GetPeerName() {
+    LOG_WARNING(Network, "(STUBBED) called");
+    return {SockAddrIn{}, Errno::SUCCESS};
+}
+
+std::pair<SockAddrIn, Errno> ProxySocket::GetSockName() {
+    LOG_WARNING(Network, "(STUBBED) called");
+    return {SockAddrIn{}, Errno::SUCCESS};
+}
+
+Errno ProxySocket::Bind(SockAddrIn addr) {
+    if (is_bound) {
+        LOG_WARNING(Network, "Rebinding Socket is unimplemented!");
+        return Errno::SUCCESS;
+    }
+    local_endpoint = addr;
+    is_bound = true;
+
+    return Errno::SUCCESS;
+}
+
+Errno ProxySocket::Listen(s32 backlog) {
+    LOG_WARNING(Network, "(STUBBED) called");
+    return Errno::SUCCESS;
+}
+
+Errno ProxySocket::Shutdown(ShutdownHow how) {
+    LOG_WARNING(Network, "(STUBBED) called");
+    return Errno::SUCCESS;
+}
+
+std::pair<s32, Errno> ProxySocket::Recv(int flags, std::vector<u8>& message) {
+    LOG_WARNING(Network, "(STUBBED) called");
+    ASSERT(flags == 0);
+    ASSERT(message.size() < static_cast<size_t>(std::numeric_limits<int>::max()));
+
+    return {static_cast<s32>(0), Errno::SUCCESS};
+}
+
+std::pair<s32, Errno> ProxySocket::RecvFrom(int flags, std::vector<u8>& message, SockAddrIn* addr) {
+    ASSERT(flags == 0);
+    ASSERT(message.size() < static_cast<size_t>(std::numeric_limits<int>::max()));
+
+    // TODO (flTobi): Verify the timeout behavior and break when connection is lost
+    const auto timestamp = std::chrono::steady_clock::now();
+    // When receive_timeout is set to zero, the socket is supposed to wait indefinitely until a
+    // packet arrives. In order to prevent lost packets from hanging the emulation thread, we set
+    // the timeout to 5s instead
+    const auto timeout = receive_timeout == 0 ? 5000 : receive_timeout;
+    while (true) {
+        {
+            std::lock_guard guard(packets_mutex);
+            if (received_packets.size() > 0) {
+                return ReceivePacket(flags, message, addr, message.size());
+            }
+        }
+
+        if (!blocking) {
+            return {-1, Errno::AGAIN};
+        }
+
+        std::this_thread::yield();
+
+        const auto time_diff = std::chrono::steady_clock::now() - timestamp;
+        const auto time_diff_ms =
+            std::chrono::duration_cast<std::chrono::milliseconds>(time_diff).count();
+
+        if (time_diff_ms > timeout) {
+            return {-1, Errno::TIMEDOUT};
+        }
+    }
+}
+
+std::pair<s32, Errno> ProxySocket::ReceivePacket(int flags, std::vector<u8>& message,
+                                                 SockAddrIn* addr, std::size_t max_length) {
+    ProxyPacket& packet = received_packets.front();
+    if (addr) {
+        addr->family = Domain::INET;
+        addr->ip = packet.local_endpoint.ip;         // The senders ip address
+        addr->portno = packet.local_endpoint.portno; // The senders port number
+    }
+
+    bool peek = (flags & FLAG_MSG_PEEK) != 0;
+    std::size_t read_bytes;
+    if (packet.data.size() > max_length) {
+        read_bytes = max_length;
+        message.clear();
+        std::copy(packet.data.begin(), packet.data.begin() + read_bytes,
+                  std::back_inserter(message));
+        message.resize(max_length);
+
+        if (protocol == Protocol::UDP) {
+            if (!peek) {
+                received_packets.pop();
+            }
+            return {-1, Errno::MSGSIZE};
+        } else if (protocol == Protocol::TCP) {
+            std::vector<u8> numArray(packet.data.size() - max_length);
+            std::copy(packet.data.begin() + max_length, packet.data.end(),
+                      std::back_inserter(numArray));
+            packet.data = numArray;
+        }
+    } else {
+        read_bytes = packet.data.size();
+        message.clear();
+        std::copy(packet.data.begin(), packet.data.end(), std::back_inserter(message));
+        message.resize(max_length);
+        if (!peek) {
+            received_packets.pop();
+        }
+    }
+
+    return {static_cast<u32>(read_bytes), Errno::SUCCESS};
+}
+
+std::pair<s32, Errno> ProxySocket::Send(const std::vector<u8>& message, int flags) {
+    LOG_WARNING(Network, "(STUBBED) called");
+    ASSERT(message.size() < static_cast<size_t>(std::numeric_limits<int>::max()));
+    ASSERT(flags == 0);
+
+    return {static_cast<s32>(0), Errno::SUCCESS};
+}
+
+void ProxySocket::SendPacket(ProxyPacket& packet) {
+    if (auto room_member = room_network.GetRoomMember().lock()) {
+        if (room_member->IsConnected()) {
+            room_member->SendProxyPacket(packet);
+        }
+    }
+}
+
+std::pair<s32, Errno> ProxySocket::SendTo(u32 flags, const std::vector<u8>& message,
+                                          const SockAddrIn* addr) {
+    ASSERT(flags == 0);
+
+    if (!is_bound) {
+        LOG_ERROR(Network, "ProxySocket is not bound!");
+        return {static_cast<s32>(message.size()), Errno::SUCCESS};
+    }
+
+    if (auto room_member = room_network.GetRoomMember().lock()) {
+        if (!room_member->IsConnected()) {
+            return {static_cast<s32>(message.size()), Errno::SUCCESS};
+        }
+    }
+
+    ProxyPacket packet;
+    packet.local_endpoint = local_endpoint;
+    packet.remote_endpoint = *addr;
+    packet.protocol = protocol;
+    packet.broadcast = broadcast;
+
+    auto& ip = local_endpoint.ip;
+    auto ipv4 = Network::GetHostIPv4Address();
+    // If the ip is all zeroes (INADDR_ANY) or if it matches the hosts ip address,
+    // replace it with a "fake" routing address
+    if (std::all_of(ip.begin(), ip.end(), [](u8 i) { return i == 0; }) || (ipv4 && ipv4 == ip)) {
+        if (auto room_member = room_network.GetRoomMember().lock()) {
+            packet.local_endpoint.ip = room_member->GetFakeIpAddress();
+        }
+    }
+
+    packet.data.clear();
+    std::copy(message.begin(), message.end(), std::back_inserter(packet.data));
+
+    SendPacket(packet);
+
+    return {static_cast<s32>(message.size()), Errno::SUCCESS};
+}
+
+Errno ProxySocket::Close() {
+    fd = INVALID_SOCKET;
+    closed = true;
+
+    return Errno::SUCCESS;
+}
+
+Errno ProxySocket::SetLinger(bool enable, u32 linger) {
+    struct Linger {
+        u16 linger_enable;
+        u16 linger_time;
+    } values;
+    values.linger_enable = enable ? 1 : 0;
+    values.linger_time = static_cast<u16>(linger);
+
+    return SetSockOpt(fd, SO_LINGER, values);
+}
+
+Errno ProxySocket::SetReuseAddr(bool enable) {
+    return SetSockOpt<u32>(fd, SO_REUSEADDR, enable ? 1 : 0);
+}
+
+Errno ProxySocket::SetBroadcast(bool enable) {
+    broadcast = enable;
+    return SetSockOpt<u32>(fd, SO_BROADCAST, enable ? 1 : 0);
+}
+
+Errno ProxySocket::SetSndBuf(u32 value) {
+    return SetSockOpt(fd, SO_SNDBUF, value);
+}
+
+Errno ProxySocket::SetKeepAlive(bool enable) {
+    return Errno::SUCCESS;
+}
+
+Errno ProxySocket::SetRcvBuf(u32 value) {
+    return SetSockOpt(fd, SO_RCVBUF, value);
+}
+
+Errno ProxySocket::SetSndTimeo(u32 value) {
+    send_timeout = value;
+    return SetSockOpt(fd, SO_SNDTIMEO, static_cast<int>(value));
+}
+
+Errno ProxySocket::SetRcvTimeo(u32 value) {
+    receive_timeout = value;
+    return SetSockOpt(fd, SO_RCVTIMEO, static_cast<int>(value));
+}
+
+Errno ProxySocket::SetNonBlock(bool enable) {
+    blocking = !enable;
+    return Errno::SUCCESS;
+}
+
+bool ProxySocket::IsOpened() const {
+    return fd != INVALID_SOCKET;
+}
+
+} // namespace Network
diff --git a/src/core/internal_network/socket_proxy.h b/src/core/internal_network/socket_proxy.h
new file mode 100644
index 000000000..f12b5f567
--- /dev/null
+++ b/src/core/internal_network/socket_proxy.h
@@ -0,0 +1,97 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <mutex>
+#include <vector>
+#include <queue>
+
+#include "common/common_funcs.h"
+#include "core/internal_network/sockets.h"
+#include "network/network.h"
+
+namespace Network {
+
+class ProxySocket : public SocketBase {
+public:
+    YUZU_NON_COPYABLE(ProxySocket);
+    YUZU_NON_MOVEABLE(ProxySocket);
+
+    explicit ProxySocket(RoomNetwork& room_network_) noexcept;
+    ~ProxySocket() override;
+
+    void HandleProxyPacket(const ProxyPacket& packet) override;
+
+    Errno Initialize(Domain domain, Type type, Protocol socket_protocol) override;
+
+    Errno Close() override;
+
+    std::pair<AcceptResult, Errno> Accept() override;
+
+    Errno Connect(SockAddrIn addr_in) override;
+
+    std::pair<SockAddrIn, Errno> GetPeerName() override;
+
+    std::pair<SockAddrIn, Errno> GetSockName() override;
+
+    Errno Bind(SockAddrIn addr) override;
+
+    Errno Listen(s32 backlog) override;
+
+    Errno Shutdown(ShutdownHow how) override;
+
+    std::pair<s32, Errno> Recv(int flags, std::vector<u8>& message) override;
+
+    std::pair<s32, Errno> RecvFrom(int flags, std::vector<u8>& message, SockAddrIn* addr) override;
+
+    std::pair<s32, Errno> ReceivePacket(int flags, std::vector<u8>& message, SockAddrIn* addr,
+                                        std::size_t max_length);
+
+    std::pair<s32, Errno> Send(const std::vector<u8>& message, int flags) override;
+
+    void SendPacket(ProxyPacket& packet);
+
+    std::pair<s32, Errno> SendTo(u32 flags, const std::vector<u8>& message,
+                                 const SockAddrIn* addr) override;
+
+    Errno SetLinger(bool enable, u32 linger) override;
+
+    Errno SetReuseAddr(bool enable) override;
+
+    Errno SetBroadcast(bool enable) override;
+
+    Errno SetKeepAlive(bool enable) override;
+
+    Errno SetSndBuf(u32 value) override;
+
+    Errno SetRcvBuf(u32 value) override;
+
+    Errno SetSndTimeo(u32 value) override;
+
+    Errno SetRcvTimeo(u32 value) override;
+
+    Errno SetNonBlock(bool enable) override;
+
+    template <typename T>
+    Errno SetSockOpt(SOCKET fd, int option, T value);
+
+    bool IsOpened() const override;
+
+private:
+    bool broadcast = false;
+    bool closed = false;
+    u32 send_timeout = 0;
+    u32 receive_timeout = 0;
+    bool is_bound = false;
+    SockAddrIn local_endpoint{};
+    bool blocking = true;
+    std::queue<ProxyPacket> received_packets;
+    Protocol protocol;
+
+    std::mutex packets_mutex;
+
+    RoomNetwork& room_network;
+};
+
+} // namespace Network
diff --git a/src/core/internal_network/sockets.h b/src/core/internal_network/sockets.h
index 77e27e928..a70429b19 100644
--- a/src/core/internal_network/sockets.h
+++ b/src/core/internal_network/sockets.h
@@ -14,20 +14,88 @@
 
 #include "common/common_types.h"
 #include "core/internal_network/network.h"
+#include "network/network.h"
 
 // TODO: C++20 Replace std::vector usages with std::span
 
 namespace Network {
 
-class Socket {
+class SocketBase {
 public:
+#ifdef YUZU_UNIX
+    using SOCKET = int;
+    static constexpr SOCKET INVALID_SOCKET = -1;
+    static constexpr SOCKET SOCKET_ERROR = -1;
+#endif
+
     struct AcceptResult {
-        std::unique_ptr<Socket> socket;
+        std::unique_ptr<SocketBase> socket;
         SockAddrIn sockaddr_in;
     };
+    virtual ~SocketBase() = default;
+
+    virtual SocketBase& operator=(const SocketBase&) = delete;
+
+    // Avoid closing sockets implicitly
+    virtual SocketBase& operator=(SocketBase&&) noexcept = delete;
+
+    virtual Errno Initialize(Domain domain, Type type, Protocol protocol) = 0;
+
+    virtual Errno Close() = 0;
+
+    virtual std::pair<AcceptResult, Errno> Accept() = 0;
+
+    virtual Errno Connect(SockAddrIn addr_in) = 0;
+
+    virtual std::pair<SockAddrIn, Errno> GetPeerName() = 0;
+
+    virtual std::pair<SockAddrIn, Errno> GetSockName() = 0;
+
+    virtual Errno Bind(SockAddrIn addr) = 0;
+
+    virtual Errno Listen(s32 backlog) = 0;
+
+    virtual Errno Shutdown(ShutdownHow how) = 0;
+
+    virtual std::pair<s32, Errno> Recv(int flags, std::vector<u8>& message) = 0;
+
+    virtual std::pair<s32, Errno> RecvFrom(int flags, std::vector<u8>& message,
+                                           SockAddrIn* addr) = 0;
+
+    virtual std::pair<s32, Errno> Send(const std::vector<u8>& message, int flags) = 0;
+
+    virtual std::pair<s32, Errno> SendTo(u32 flags, const std::vector<u8>& message,
+                                         const SockAddrIn* addr) = 0;
+
+    virtual Errno SetLinger(bool enable, u32 linger) = 0;
 
-    explicit Socket() = default;
-    ~Socket();
+    virtual Errno SetReuseAddr(bool enable) = 0;
+
+    virtual Errno SetKeepAlive(bool enable) = 0;
+
+    virtual Errno SetBroadcast(bool enable) = 0;
+
+    virtual Errno SetSndBuf(u32 value) = 0;
+
+    virtual Errno SetRcvBuf(u32 value) = 0;
+
+    virtual Errno SetSndTimeo(u32 value) = 0;
+
+    virtual Errno SetRcvTimeo(u32 value) = 0;
+
+    virtual Errno SetNonBlock(bool enable) = 0;
+
+    virtual bool IsOpened() const = 0;
+
+    virtual void HandleProxyPacket(const ProxyPacket& packet) = 0;
+
+    SOCKET fd = INVALID_SOCKET;
+};
+
+class Socket : public SocketBase {
+public:
+    Socket() = default;
+    ~Socket() override;
 
     Socket(const Socket&) = delete;
     Socket& operator=(const Socket&) = delete;
@@ -37,57 +105,57 @@ public:
     // Avoid closing sockets implicitly
     Socket& operator=(Socket&&) noexcept = delete;
 
-    Errno Initialize(Domain domain, Type type, Protocol protocol);
+    Errno Initialize(Domain domain, Type type, Protocol protocol) override;
 
-    Errno Close();
+    Errno Close() override;
 
-    std::pair<AcceptResult, Errno> Accept();
+    std::pair<AcceptResult, Errno> Accept() override;
 
-    Errno Connect(SockAddrIn addr_in);
+    Errno Connect(SockAddrIn addr_in) override;
 
-    std::pair<SockAddrIn, Errno> GetPeerName();
+    std::pair<SockAddrIn, Errno> GetPeerName() override;
 
-    std::pair<SockAddrIn, Errno> GetSockName();
+    std::pair<SockAddrIn, Errno> GetSockName() override;
 
-    Errno Bind(SockAddrIn addr);
+    Errno Bind(SockAddrIn addr) override;
 
-    Errno Listen(s32 backlog);
+    Errno Listen(s32 backlog) override;
 
-    Errno Shutdown(ShutdownHow how);
+    Errno Shutdown(ShutdownHow how) override;
 
-    std::pair<s32, Errno> Recv(int flags, std::vector<u8>& message);
+    std::pair<s32, Errno> Recv(int flags, std::vector<u8>& message) override;
 
-    std::pair<s32, Errno> RecvFrom(int flags, std::vector<u8>& message, SockAddrIn* addr);
+    std::pair<s32, Errno> RecvFrom(int flags, std::vector<u8>& message, SockAddrIn* addr) override;
 
-    std::pair<s32, Errno> Send(const std::vector<u8>& message, int flags);
+    std::pair<s32, Errno> Send(const std::vector<u8>& message, int flags) override;
 
-    std::pair<s32, Errno> SendTo(u32 flags, const std::vector<u8>& message, const SockAddrIn* addr);
+    std::pair<s32, Errno> SendTo(u32 flags, const std::vector<u8>& message,
+                                 const SockAddrIn* addr) override;
 
-    Errno SetLinger(bool enable, u32 linger);
+    Errno SetLinger(bool enable, u32 linger) override;
 
-    Errno SetReuseAddr(bool enable);
+    Errno SetReuseAddr(bool enable) override;
 
-    Errno SetKeepAlive(bool enable);
+    Errno SetKeepAlive(bool enable) override;
 
-    Errno SetBroadcast(bool enable);
+    Errno SetBroadcast(bool enable) override;
 
-    Errno SetSndBuf(u32 value);
+    Errno SetSndBuf(u32 value) override;
 
-    Errno SetRcvBuf(u32 value);
+    Errno SetRcvBuf(u32 value) override;
 
-    Errno SetSndTimeo(u32 value);
+    Errno SetSndTimeo(u32 value) override;
 
-    Errno SetRcvTimeo(u32 value);
+    Errno SetRcvTimeo(u32 value) override;
 
-    Errno SetNonBlock(bool enable);
+    Errno SetNonBlock(bool enable) override;
 
-    bool IsOpened() const;
+    template <typename T>
+    Errno SetSockOpt(SOCKET fd, int option, T value);
 
-#if defined(_WIN32)
-    SOCKET fd = INVALID_SOCKET;
-#elif YUZU_UNIX
-    int fd = -1;
-#endif
+    bool IsOpened() const override;
+
+    void HandleProxyPacket(const ProxyPacket& packet) override;
 };
 
 std::pair<s32, Errno> Poll(std::vector<PollFD>& poll_fds, s32 timeout);