first fake icmp impl

src/core/CMakeLists.txt

@@ -1133,6 +1133,8 @@ add_library(core STATIC
     internal_network/network_interface.h
     internal_network/socket_proxy.cpp
     internal_network/socket_proxy.h
+    internal_network/socket_icmp.cpp
+    internal_network/socket_icmp.h
     internal_network/socket_types.h
     internal_network/sockets.h
     internal_network/wifi_scanner.h

src/core/hle/service/sockets/bsd.cpp

@@ -20,6 +20,7 @@
 #include "core/hle/service/sockets/sockets_translate.h"
 #include "core/internal_network/network.h"
 #include "core/internal_network/socket_proxy.h"
+#include "core/internal_network/socket_icmp.h"
 #include "core/internal_network/sockets.h"
 #include "network/network.h"
 #include <common/settings.h>
@@ -520,6 +521,8 @@ std::pair<s32, Network::Errno> BSD::SocketImpl(Network::Domain domain, Network::
     auto room_member = Network::GetRoomMember().lock();
     if (room_member && room_member->IsConnected()) {
         descriptor.socket = std::make_shared<Network::ProxySocket>();
+    } else if (protocol == Network::Protocol::ICMP || protocol == Network::Protocol::ICMPV6) {
+        descriptor.socket = std::make_shared<Network::IcmpSocket>();
     } else {
         descriptor.socket = std::make_shared<Network::Socket>();
     }

src/core/internal_network/socket_icmp.cpp

@@ -0,0 +1,155 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "common/assert.h"
+#include "common/logging.h"
+#include "core/internal_network/socket_icmp.h"
+
+#ifdef __unix__
+#include <sys/socket.h>
+#endif
+
+namespace Network {
+
+namespace {
+
+u16 ComputeChecksum(std::span<const u8> data) {
+    u32 sum = 0;
+    for (size_t i = 0; i < data.size(); i += 2) {
+        u32 value = (u32(data[i + 0]) << 8ull) | u32(data[i + 1]); //big endian
+        sum += value;
+    }
+    if (data.size() % 2 != 0){
+        sum += u16(data[data.size() - 1]) << 8;
+    }
+    while ((sum >> 16) != 0)
+        sum = (sum & 0xffff) + (sum >> 16);
+    return (~sum) & 0xffff;
+}
+
+}
+
+IcmpSocket::IcmpSocket() noexcept {}
+
+IcmpSocket::~IcmpSocket() {
+    if (fd == INVALID_SOCKET) {
+        return;
+    }
+    fd = INVALID_SOCKET;
+}
+
+Errno IcmpSocket::SetSockOpt(Network::SocketLevel level, Network::OptName optname, std::span<const u8> optval) {
+    LOG_WARNING(Network, "(stubbed) level={},optname={},optval={}", level, optname, optval.size());
+    return Errno::SUCCESS;
+}
+
+Errno IcmpSocket::Initialize(Domain domain, Type type, Protocol socket_protocol) {
+    return Errno::SUCCESS;
+}
+
+std::pair<IcmpSocket::AcceptResult, Errno> IcmpSocket::Accept() {
+    LOG_WARNING(Network, "(stubbed) called");
+    return {AcceptResult{}, Errno::SUCCESS};
+}
+
+Errno IcmpSocket::Connect(Network::SockAddrIn addr_in) {
+    LOG_WARNING(Network, "(stubbed) called");
+    return Errno::SUCCESS;
+}
+
+std::pair<Network::SockAddrIn, Errno> IcmpSocket::GetPeerName() {
+    LOG_WARNING(Network, "(stubbed) called");
+    return {Network::SockAddrIn{}, Errno::SUCCESS};
+}
+
+std::pair<Network::SockAddrIn, Errno> IcmpSocket::GetSockName() {
+    LOG_WARNING(Network, "(stubbed) called");
+    return {Network::SockAddrIn{}, Errno::SUCCESS};
+}
+
+Errno IcmpSocket::Bind(Network::SockAddrIn addr) {
+    LOG_WARNING(Network, "(stubbed) called");
+    return Errno::SUCCESS;
+}
+
+Errno IcmpSocket::Listen(s32 backlog) {
+    LOG_WARNING(Network, "(stubbed) called");
+    return Errno::SUCCESS;
+}
+
+Errno IcmpSocket::Shutdown(ShutdownHow how) {
+    LOG_WARNING(Network, "(stubbed) called");
+    return Errno::SUCCESS;
+}
+
+std::pair<s32, Errno> IcmpSocket::Recv(int flags, std::span<u8> message) {
+    LOG_DEBUG(Network, "(stubbed) called");
+    return {s32(0), Errno::NOTCONN};
+}
+
+std::pair<s32, Errno> IcmpSocket::RecvFrom(int flags, std::span<u8> message, Network::SockAddrIn* addr) {
+    LOG_DEBUG(Network, "(stubbed) called");
+    ASSERT(flags == 0);
+    ASSERT(message.size() < std::size_t((std::numeric_limits<int>::max)()));
+    if (!data.empty()) {
+        auto const n = (std::max)(data.size(), message.size());
+        std::copy(data.begin(), data.begin() + n, message.begin());
+        return {n, Errno::SUCCESS};
+    }
+    return {-1, Errno::TIMEDOUT};
+}
+
+std::pair<s32, Errno> IcmpSocket::Send(std::span<const u8> message, int flags) {
+    LOG_DEBUG(Network, "(stubbed) called");
+    return {s32(0), Errno::NOTCONN};
+}
+
+std::pair<s32, Errno> IcmpSocket::SendTo(u32 flags, std::span<const u8> message, const Network::SockAddrIn* addr) {
+    LOG_DEBUG(Network, "(stubbed) called");
+    // 0 -> 8 (IPv4), 128 (IPv6)
+    // 1 -> 0
+    // 2..4 -> checksum
+    // 4..6 -> ident
+    // 6..8 -> seq
+    if (message.size() >= 8) {
+        ASSERT(message[0] == 0);
+        auto const csum_pos = data.size();
+        data.push_back(8);
+        data.push_back(0);
+        data.push_back(0); //checksum (placeholder 0)
+        data.push_back(0);
+        data.push_back(message[4]); //ident
+        data.push_back(message[5]);
+        data.push_back(message[6]); //seq
+        data.push_back(message[7]);
+        auto const csum = ComputeChecksum(std::span<const u8>{data.begin() + csum_pos, data.end()});
+        data[csum_pos + 2] = u8(csum >> 8); //hi
+        data[csum_pos + 3] = u8(csum); //lo
+    }
+    return {s32(message.size()), Errno::SUCCESS};
+}
+
+Errno IcmpSocket::Close() {
+    LOG_DEBUG(Network, "called");
+    fd = INVALID_SOCKET;
+    return Errno::SUCCESS;
+}
+
+std::pair<Errno, Errno> IcmpSocket::GetPendingError() {
+    LOG_DEBUG(Network, "called");
+    return {Errno::SUCCESS, Errno::SUCCESS};
+}
+
+bool IcmpSocket::IsOpened() const {
+    return fd != INVALID_SOCKET;
+}
+
+void IcmpSocket::HandleProxyPacket(const ProxyPacket& packet) {
+    LOG_WARNING(Network, "(stubbed) called");
+}
+Errno IcmpSocket::SetNonBlock(bool enable) {
+    LOG_WARNING(Network, "(stubbed) called");
+    return Errno::SUCCESS;
+}
+
+} // namespace Network

src/core/internal_network/socket_icmp.h

@@ -0,0 +1,37 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <span>
+#include "core/internal_network/sockets.h"
+
+namespace Network {
+
+class IcmpSocket : public Network::SocketBase {
+public:
+    explicit IcmpSocket() noexcept;
+    ~IcmpSocket() override;
+    Errno Initialize(Domain domain, Type type, Protocol socket_protocol) override;
+    Errno Close() override;
+    std::pair<AcceptResult, Errno> Accept() override;
+    Errno Connect(Network::SockAddrIn addr_in) override;
+    std::pair<Network::SockAddrIn, Errno> GetPeerName() override;
+    std::pair<Network::SockAddrIn, Errno> GetSockName() override;
+    Errno Bind(Network::SockAddrIn addr) override;
+    Errno Listen(s32 backlog) override;
+    Errno Shutdown(ShutdownHow how) override;
+    std::pair<s32, Errno> Recv(int flags, std::span<u8> message) override;
+    std::pair<s32, Errno> RecvFrom(int flags, std::span<u8> message, Network::SockAddrIn* addr) override;
+    std::pair<s32, Errno> Send(std::span<const u8> message, int flags) override;
+    std::pair<s32, Errno> SendTo(u32 flags, std::span<const u8> message, const Network::SockAddrIn* addr) override;
+    Errno SetSockOpt(Network::SocketLevel level, Network::OptName option, std::span<const u8> value) override;
+    std::pair<Errno, Errno> GetPendingError() override;
+    bool IsOpened() const override;
+    void HandleProxyPacket(const ProxyPacket& packet) override;
+    Errno SetNonBlock(bool enable) override;
+
+    std::vector<u8> data;
+};
+
+} // namespace Network