add lwIP TCP/IP stack as a runtime driver, native socket syscalls, SysGetMemoryStatus replacing CatchAllDebugBucket, fix timeGetTime to return milliseconds, fix SysSleep to interpret argument as milliseconds, SysGetTick now returns microseconds, harden all syscalls against bad user pointers with CopyFromUser/CopyToUser/MmProbeUser throughout, add networking test apps, port-forward 8080 in runa.bat, split LWIP_DRIVER_CFLAGS, add settings.ini to deploy, remove ethernet.c stub

code/kernel/net_stack.h

@@ -0,0 +1,48 @@
+#pragma once
+// net_stack.h - provider interface between kernel socket facade and network stack drivers.
+//
+// The kernel owns process handles, user-memory copying, NET_DEVICE registration,
+// and SOCKET_OBJECT lifetime. A stack driver owns protocol implementation.
+
+#include <stdint.h>
+#include <stddef.h>
+#include <ke_status.h>
+#include <net_device.h>
+#include <net_abi.h>
+
+#define NET_STACK_PROVIDER_VERSION 1u
+
+typedef struct NET_STACK_PROVIDER NET_STACK_PROVIDER;
+
+struct NET_STACK_PROVIDER {
+    uint32_t Version;
+    const char* Name;
+
+    KSTATUS (*AttachDevice)(NET_DEVICE* device);
+    KSTATUS (*ReceiveFrame)(NET_DEVICE* device, const void* frame, size_t length);
+
+    KSTATUS (*SocketCreate)(uint32_t domain, uint32_t type, uint32_t protocol, void** outSocket);
+    void    (*SocketClose)(void* socket);
+
+    KSTATUS (*Bind)(void* socket, const SYS_SOCKET_ADDRESS_IPV4_K* address, size_t addressSize);
+    KSTATUS (*Listen)(void* socket, uint32_t backlog);
+    KSTATUS (*Accept)(void* socket, void** acceptedOut, SYS_SOCKET_ADDRESS_IPV4_K* remoteOut);
+    KSTATUS (*Connect)(void* socket, const SYS_SOCKET_ADDRESS_IPV4_K* address, size_t addressSize);
+
+    KSTATUS (*Send)(void* socket, const void* buffer, size_t length, uint32_t flags, size_t* sentOut);
+    KSTATUS (*Receive)(void* socket, void* buffer, size_t length, uint32_t flags, size_t* receivedOut);
+    KSTATUS (*SendTo)(void* socket, const void* buffer, size_t length, uint32_t flags,
+                      const SYS_SOCKET_ADDRESS_IPV4_K* remote, size_t remoteSize, size_t* sentOut);
+    KSTATUS (*ReceiveFrom)(void* socket, void* buffer, size_t length, uint32_t flags,
+                           SYS_SOCKET_ADDRESS_IPV4_K* remoteOut, size_t* receivedOut);
+
+    KSTATUS (*Shutdown)(void* socket, uint32_t how);
+    KSTATUS (*SetOption)(void* socket, uint32_t option, const void* value, size_t valueSize);
+    KSTATUS (*GetOption)(void* socket, uint32_t option, void* value, size_t valueSize, size_t* actualSizeOut);
+    KSTATUS (*Poll)(void* socket, uint32_t events, uint32_t* returnedEventsOut);
+
+    KSTATUS (*ResolveHostIpv4)(const char* name, SYS_SOCKET_ADDRESS_IPV4_K* addressOut);
+};
+
+__declspec(dllexport) KSTATUS NetRegisterStackProvider(const NET_STACK_PROVIDER* provider);
+__declspec(dllexport) const NET_STACK_PROVIDER* NetGetStackProvider(void);