Add tap netif driver

bsp/simulator/applications/application.c

@@ -22,7 +22,11 @@
 void rt_init_thread_entry(void *parameter)
 {
 #ifdef RT_USING_LWIP
+#ifdef RT_USING_TAPNETIF
+    tap_netif_hw_init();
+#else
     pcap_netif_hw_init();
+#endif
 #endif
 
     rt_platform_init();

bsp/simulator/drivers/SConscript

@@ -26,8 +26,10 @@ if GetDepend('RT_USING_DFS_WINSHAREDIR') == False:
     SrcRemove(src, 'dfs_win32.c')
 if GetDepend('RT_USING_MODULE') == False:
     SrcRemove(src, ['module_win32.c'])
+if GetDepend('RT_USING_TAPNETIF') == False:
+    SrcRemove(src, ['tap_netif.c'])
 if sys.platform[0:5]=="linux": #check whether under linux
-    SrcRemove(src, ['module_win32.c', 'dfs_win32.c'])
+    SrcRemove(src, ['module_win32.c', 'dfs_win32.c', 'tap_netif.c'])
 
 group = DefineGroup('Drivers', src, depend = [''],
                     CPPPATH = CPPPATH, LIBS=LIBS, LIBPATH=LIBPATH)

bsp/simulator/drivers/tap_netif.c

@@ -0,0 +1,791 @@
+/*
+ *  TAP-Win32 -- A kernel driver to provide virtual tap device functionality
+ *               on Windows.  Originally derived from the CIPE-Win32
+ *               project by Damion K. Wilson, with extensive modifications by
+ *               James Yonan.
+ *
+ *  All source code which derives from the CIPE-Win32 project is
+ *  Copyright (C) Damion K. Wilson, 2003, and is released under the
+ *  GPL version 2 (see below).
+ *
+ *  All other source code is Copyright (C) James Yonan, 2003-2004,
+ *  and is released under the GPL version 2 (see below).
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program (see the file COPYING included with this
+ *  distribution); if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <windows.h>
+#include <winioctl.h>
+#include <rtthread.h>
+#include <netif/ethernetif.h>
+
+#define MAX_ADDR_LEN 6
+#define TAP_IFNAME	"RT-net"
+
+//=============
+// TAP IOCTLs
+//=============
+
+#define TAP_CONTROL_CODE(request,method) \
+  CTL_CODE (FILE_DEVICE_UNKNOWN, request, method, FILE_ANY_ACCESS)
+
+#define TAP_IOCTL_GET_MAC               TAP_CONTROL_CODE (1, METHOD_BUFFERED)
+#define TAP_IOCTL_GET_VERSION           TAP_CONTROL_CODE (2, METHOD_BUFFERED)
+#define TAP_IOCTL_GET_MTU               TAP_CONTROL_CODE (3, METHOD_BUFFERED)
+#define TAP_IOCTL_GET_INFO              TAP_CONTROL_CODE (4, METHOD_BUFFERED)
+#define TAP_IOCTL_CONFIG_POINT_TO_POINT TAP_CONTROL_CODE (5, METHOD_BUFFERED)
+#define TAP_IOCTL_SET_MEDIA_STATUS      TAP_CONTROL_CODE (6, METHOD_BUFFERED)
+#define TAP_IOCTL_CONFIG_DHCP_MASQ      TAP_CONTROL_CODE (7, METHOD_BUFFERED)
+#define TAP_IOCTL_GET_LOG_LINE          TAP_CONTROL_CODE (8, METHOD_BUFFERED)
+#define TAP_IOCTL_CONFIG_DHCP_SET_OPT   TAP_CONTROL_CODE (9, METHOD_BUFFERED)
+
+//=================
+// Registry keys
+//=================
+
+#define ADAPTER_KEY "SYSTEM\\CurrentControlSet\\Control\\Class\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
+
+#define NETWORK_CONNECTIONS_KEY "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
+
+//======================
+// Filesystem prefixes
+//======================
+
+#define USERMODEDEVICEDIR "\\\\.\\Global\\"
+#define TAPSUFFIX         ".tap"
+
+//======================
+// Compile time configuration
+//======================
+
+//#define DEBUG_TAP_WIN32
+
+#define TUN_ASYNCHRONOUS_WRITES 1
+
+#define TUN_BUFFER_SIZE 1560
+#define TUN_MAX_BUFFER_COUNT 32
+
+/*
+ * The data member "buffer" must be the first element in the tun_buffer
+ * structure. See the function, tap_win32_free_buffer.
+ */
+typedef struct tun_buffer_s {
+    unsigned char buffer [TUN_BUFFER_SIZE];
+    unsigned long read_size;
+    struct tun_buffer_s* next;
+} tun_buffer_t;
+
+typedef struct tap_win32_overlapped {
+    HANDLE handle;
+    HANDLE read_event;
+    HANDLE write_event;
+    HANDLE output_queue_semaphore;
+    HANDLE free_list_semaphore;
+    HANDLE tap_semaphore;
+    CRITICAL_SECTION output_queue_cs;
+    CRITICAL_SECTION free_list_cs;
+    OVERLAPPED read_overlapped;
+    OVERLAPPED write_overlapped;
+    tun_buffer_t buffers[TUN_MAX_BUFFER_COUNT];
+    tun_buffer_t* free_list;
+    tun_buffer_t* output_queue_front;
+    tun_buffer_t* output_queue_back;
+} tap_win32_overlapped_t;
+
+static tap_win32_overlapped_t tap_overlapped;
+
+/************************************************************************/
+/* RT-Thread Network Interface                                          */
+/************************************************************************/
+struct tap_netif
+{
+	/* inherit from ethernet device */
+	struct eth_device parent;
+
+	tap_win32_overlapped_t *handle;
+
+	/* interface address info. */
+	rt_uint8_t  dev_addr[MAX_ADDR_LEN];		/* hw address	*/
+};
+#define NETIF_DEVICE(netif) ((struct tap_netif*)(netif))
+#define NETIF_TAP(netif)   (NETIF_DEVICE(netif)->handle)
+
+static struct tap_netif tap_netif_device;
+static struct rt_semaphore sem_lock;
+
+static tun_buffer_t* get_buffer_from_free_list(tap_win32_overlapped_t* const overlapped)
+{
+    tun_buffer_t* buffer = NULL;
+    WaitForSingleObject(overlapped->free_list_semaphore, INFINITE);
+    EnterCriticalSection(&overlapped->free_list_cs);
+    buffer = overlapped->free_list;
+    overlapped->free_list = buffer->next;
+    LeaveCriticalSection(&overlapped->free_list_cs);
+    buffer->next = NULL;
+    return buffer;
+}
+
+static void put_buffer_on_free_list(tap_win32_overlapped_t* const overlapped, tun_buffer_t* const buffer)
+{
+    EnterCriticalSection(&overlapped->free_list_cs);
+    buffer->next = overlapped->free_list;
+    overlapped->free_list = buffer;
+    LeaveCriticalSection(&overlapped->free_list_cs);
+    ReleaseSemaphore(overlapped->free_list_semaphore, 1, NULL);
+}
+
+static tun_buffer_t* get_buffer_from_output_queue(tap_win32_overlapped_t* const overlapped, const int block)
+{
+    tun_buffer_t* buffer = NULL;
+    DWORD result, timeout = block ? INFINITE : 0L;
+
+    // Non-blocking call
+    result = WaitForSingleObject(overlapped->output_queue_semaphore, timeout);
+
+    switch (result)
+    {
+        // The semaphore object was signaled.
+        case WAIT_OBJECT_0:
+            EnterCriticalSection(&overlapped->output_queue_cs);
+
+            buffer = overlapped->output_queue_front;
+            overlapped->output_queue_front = buffer->next;
+
+            if(overlapped->output_queue_front == NULL) {
+                overlapped->output_queue_back = NULL;
+            }
+
+            LeaveCriticalSection(&overlapped->output_queue_cs);
+            break;
+
+        // Semaphore was nonsignaled, so a time-out occurred.
+        case WAIT_TIMEOUT:
+            // Cannot open another window.
+            break;
+    }
+
+    return buffer;
+}
+
+static tun_buffer_t* get_buffer_from_output_queue_immediate (tap_win32_overlapped_t* const overlapped)
+{
+    return get_buffer_from_output_queue(overlapped, 0);
+}
+
+static void put_buffer_on_output_queue(tap_win32_overlapped_t* const overlapped, tun_buffer_t* const buffer)
+{
+    EnterCriticalSection(&overlapped->output_queue_cs);
+
+    if(overlapped->output_queue_front == NULL && overlapped->output_queue_back == NULL) {
+        overlapped->output_queue_front = overlapped->output_queue_back = buffer;
+    } else {
+        buffer->next = NULL;
+        overlapped->output_queue_back->next = buffer;
+        overlapped->output_queue_back = buffer;
+    }
+
+    LeaveCriticalSection(&overlapped->output_queue_cs);
+
+    ReleaseSemaphore(overlapped->output_queue_semaphore, 1, NULL);
+}
+
+
+static int is_tap_win32_dev(const char *guid)
+{
+    HKEY netcard_key;
+    LONG status;
+    DWORD len;
+    int i = 0;
+
+    status = RegOpenKeyEx(
+        HKEY_LOCAL_MACHINE,
+        ADAPTER_KEY,
+        0,
+        KEY_READ,
+        &netcard_key);
+
+    if (status != ERROR_SUCCESS) {
+        return FALSE;
+    }
+
+    for (;;) {
+        char enum_name[256];
+        char unit_string[256];
+        HKEY unit_key;
+        char component_id_string[] = "ComponentId";
+        char component_id[256];
+        char net_cfg_instance_id_string[] = "NetCfgInstanceId";
+        char net_cfg_instance_id[256];
+        DWORD data_type;
+
+        len = sizeof (enum_name);
+        status = RegEnumKeyEx(
+            netcard_key,
+            i,
+            enum_name,
+            &len,
+            NULL,
+            NULL,
+            NULL,
+            NULL);
+
+        if (status == ERROR_NO_MORE_ITEMS)
+            break;
+        else if (status != ERROR_SUCCESS) {
+            return FALSE;
+        }
+
+        rt_snprintf (unit_string, sizeof(unit_string), "%s\\%s",
+                  ADAPTER_KEY, enum_name);
+
+        status = RegOpenKeyEx(
+            HKEY_LOCAL_MACHINE,
+            unit_string,
+            0,
+            KEY_READ,
+            &unit_key);
+
+        if (status != ERROR_SUCCESS) {
+            return FALSE;
+        } else {
+            len = sizeof (component_id);
+            status = RegQueryValueEx(
+                unit_key,
+                component_id_string,
+                NULL,
+                &data_type,
+                (LPBYTE)component_id,
+                &len);
+
+            if (!(status != ERROR_SUCCESS || data_type != REG_SZ)) {
+                len = sizeof (net_cfg_instance_id);
+                status = RegQueryValueEx(
+                    unit_key,
+                    net_cfg_instance_id_string,
+                    NULL,
+                    &data_type,
+                    (LPBYTE)net_cfg_instance_id,
+                    &len);
+
+                if (status == ERROR_SUCCESS && data_type == REG_SZ) {
+                    if (/* !strcmp (component_id, TAP_COMPONENT_ID) &&*/
+                        !strcmp (net_cfg_instance_id, guid)) {
+                        RegCloseKey (unit_key);
+                        RegCloseKey (netcard_key);
+                        return TRUE;
+                    }
+                }
+            }
+            RegCloseKey (unit_key);
+        }
+        ++i;
+    }
+
+    RegCloseKey (netcard_key);
+    return FALSE;
+}
+
+static int get_device_guid(
+    char *name,
+    int name_size,
+    char *actual_name,
+    int actual_name_size)
+{
+    LONG status;
+    HKEY control_net_key;
+    DWORD len;
+    int i = 0;
+    int stop = 0;
+
+    status = RegOpenKeyEx(
+        HKEY_LOCAL_MACHINE,
+        NETWORK_CONNECTIONS_KEY,
+        0,
+        KEY_READ,
+        &control_net_key);
+
+    if (status != ERROR_SUCCESS) {
+        return -1;
+    }
+
+    while (!stop)
+    {
+        char enum_name[256];
+        char connection_string[256];
+        HKEY connection_key;
+        char name_data[256];
+        DWORD name_type;
+        const char name_string[] = "Name";
+
+        len = sizeof (enum_name);
+        status = RegEnumKeyEx(
+            control_net_key,
+            i,
+            enum_name,
+            &len,
+            NULL,
+            NULL,
+            NULL,
+            NULL);
+
+        if (status == ERROR_NO_MORE_ITEMS)
+            break;
+        else if (status != ERROR_SUCCESS) {
+            return -1;
+        }
+
+        rt_snprintf(connection_string,
+             sizeof(connection_string),
+             "%s\\%s\\Connection",
+             NETWORK_CONNECTIONS_KEY, enum_name);
+
+        status = RegOpenKeyEx(
+            HKEY_LOCAL_MACHINE,
+            connection_string,
+            0,
+            KEY_READ,
+            &connection_key);
+
+        if (status == ERROR_SUCCESS) {
+            len = sizeof (name_data);
+            status = RegQueryValueEx(
+                connection_key,
+                name_string,
+                NULL,
+                &name_type,
+                (LPBYTE)name_data,
+                &len);
+
+            if (status != ERROR_SUCCESS || name_type != REG_SZ) {
+                    return -1;
+            }
+            else {
+                if (is_tap_win32_dev(enum_name)) {
+                    rt_snprintf(name, name_size, "%s", enum_name);
+                    if (actual_name) {
+                        if (strcmp(actual_name, "") != 0) {
+                            if (strcmp(name_data, actual_name) != 0) {
+                                RegCloseKey (connection_key);
+                                ++i;
+                                continue;
+                            }
+                        }
+                        else {
+                            rt_snprintf(actual_name, actual_name_size, "%s", name_data);
+                        }
+                    }
+                    stop = 1;
+                }
+            }
+
+            RegCloseKey (connection_key);
+        }
+        ++i;
+    }
+
+    RegCloseKey (control_net_key);
+
+    if (stop == 0)
+        return -1;
+
+    return 0;
+}
+
+static int tap_win32_set_status(HANDLE handle, int status)
+{
+    unsigned long len = 0;
+
+    return DeviceIoControl(handle, TAP_IOCTL_SET_MEDIA_STATUS,
+                &status, sizeof (status),
+                &status, sizeof (status), &len, NULL);
+}
+
+static void tap_win32_overlapped_init(tap_win32_overlapped_t* const overlapped, const HANDLE handle)
+{
+    overlapped->handle = handle;
+
+    overlapped->read_event = CreateEvent(NULL, FALSE, FALSE, NULL);
+    overlapped->write_event = CreateEvent(NULL, FALSE, FALSE, NULL);
+
+    overlapped->read_overlapped.Offset = 0;
+    overlapped->read_overlapped.OffsetHigh = 0;
+    overlapped->read_overlapped.hEvent = overlapped->read_event;
+
+    overlapped->write_overlapped.Offset = 0;
+    overlapped->write_overlapped.OffsetHigh = 0;
+    overlapped->write_overlapped.hEvent = overlapped->write_event;
+
+    InitializeCriticalSection(&overlapped->output_queue_cs);
+    InitializeCriticalSection(&overlapped->free_list_cs);
+
+    overlapped->output_queue_semaphore = CreateSemaphore(
+        NULL,   // default security attributes
+        0,   // initial count
+        TUN_MAX_BUFFER_COUNT,   // maximum count
+        NULL);  // unnamed semaphore
+
+    if(!overlapped->output_queue_semaphore)  {
+        fprintf(stderr, "error creating output queue semaphore!\n");
+    }
+
+    overlapped->free_list_semaphore = CreateSemaphore(
+        NULL,   // default security attributes
+        TUN_MAX_BUFFER_COUNT,   // initial count
+        TUN_MAX_BUFFER_COUNT,   // maximum count
+        NULL);  // unnamed semaphore
+
+    if(!overlapped->free_list_semaphore)  {
+        fprintf(stderr, "error creating free list semaphore!\n");
+    }
+
+    overlapped->free_list = overlapped->output_queue_front = overlapped->output_queue_back = NULL;
+
+    {
+        unsigned index;
+        for(index = 0; index < TUN_MAX_BUFFER_COUNT; index++) {
+            tun_buffer_t* element = &overlapped->buffers[index];
+            element->next = overlapped->free_list;
+            overlapped->free_list = element;
+        }
+    }
+    /* To count buffers, initially no-signal. */
+    overlapped->tap_semaphore = CreateSemaphore(NULL, 0, TUN_MAX_BUFFER_COUNT, NULL);
+    if(!overlapped->tap_semaphore)
+        fprintf(stderr, "error creating tap_semaphore.\n");
+}
+
+static int tap_win32_write(tap_win32_overlapped_t *overlapped,
+                           const void *buffer, unsigned long size)
+{
+    unsigned long write_size;
+    BOOL result;
+    DWORD error;
+
+    result = GetOverlappedResult( overlapped->handle, &overlapped->write_overlapped,
+                                  &write_size, FALSE);
+
+    if (!result && GetLastError() == ERROR_IO_INCOMPLETE)
+        WaitForSingleObject(overlapped->write_event, INFINITE);
+
+    result = WriteFile(overlapped->handle, buffer, size,
+                       &write_size, &overlapped->write_overlapped);
+
+    if (!result) {
+        switch (error = GetLastError())
+        {
+        case ERROR_IO_PENDING:
+#ifndef TUN_ASYNCHRONOUS_WRITES
+            WaitForSingleObject(overlapped->write_event, INFINITE);
+#endif
+            break;
+        default:
+            return -1;
+        }
+    }
+
+    return write_size;
+}
+
+static void tap_win32_thread_entry(void* param)
+{
+    tap_win32_overlapped_t *overlapped;
+    unsigned long read_size;
+    BOOL result;
+    DWORD dwError;
+	tun_buffer_t* buffer;
+	struct eth_device* eth;
+
+	eth = (struct eth_device*) &tap_netif_device;
+	overlapped = NETIF_TAP(&tap_netif_device);
+	buffer = get_buffer_from_free_list(overlapped);
+
+    for (;;) {
+        result = ReadFile(overlapped->handle,
+                          buffer->buffer,
+                          sizeof(buffer->buffer),
+                          &read_size,
+                          &overlapped->read_overlapped);
+        if (!result) {
+            dwError = GetLastError();
+            if (dwError == ERROR_IO_PENDING) {
+                WaitForSingleObject(overlapped->read_event, INFINITE);
+                result = GetOverlappedResult( overlapped->handle, &overlapped->read_overlapped,
+                                              &read_size, FALSE);
+                if (!result) {
+#ifdef DEBUG_TAP_WIN32
+                    LPVOID lpBuffer;
+                    dwError = GetLastError();
+                    FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
+                                   NULL, dwError, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+                                   (LPTSTR) & lpBuffer, 0, NULL );
+                    fprintf(stderr, "Tap-Win32: Error GetOverlappedResult %d - %s\n", dwError, lpBuffer);
+                    LocalFree( lpBuffer );
+#endif
+                }
+            } else {
+#ifdef DEBUG_TAP_WIN32
+                LPVOID lpBuffer;
+                FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
+                               NULL, dwError, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+                               (LPTSTR) & lpBuffer, 0, NULL );
+                fprintf(stderr, "Tap-Win32: Error ReadFile %d - %s\n", dwError, lpBuffer);
+                LocalFree( lpBuffer );
+#endif
+            }
+        }
+
+        if(read_size > 0) {
+			// rt_kprintf("rx packet, length=%d\n", read_size);
+
+			buffer->read_size = read_size;
+            put_buffer_on_output_queue(overlapped, buffer);
+
+			/* notify eth rx thread to receive packet */
+			eth_device_ready(eth);
+
+			buffer = get_buffer_from_free_list(overlapped);
+        }
+    }
+}
+
+static int tap_win32_read(tap_win32_overlapped_t *overlapped,
+                          rt_uint8_t **pbuf, int max_size)
+{
+    int size = 0;
+
+    tun_buffer_t* buffer = get_buffer_from_output_queue_immediate(overlapped);
+
+    if(buffer != NULL) {
+        *pbuf = buffer->buffer;
+        size = (int)buffer->read_size;
+        if(size > max_size) {
+            size = max_size;
+        }
+    }
+
+    return size;
+}
+
+static void tap_win32_free_buffer(tap_win32_overlapped_t *overlapped,
+                                  rt_uint8_t *pbuf)
+{
+    tun_buffer_t* buffer = (tun_buffer_t*)pbuf;
+    put_buffer_on_free_list(overlapped, buffer);
+}
+
+static int tap_win32_open(tap_win32_overlapped_t **phandle,
+                          const char *preferred_name)
+{
+    char device_path[256];
+    char device_guid[0x100];
+    int rc;
+    HANDLE handle;
+    BOOL bret;
+    char name_buffer[0x100] = {0, };
+    struct {
+        unsigned long major;
+        unsigned long minor;
+        unsigned long debug;
+    } version;
+    DWORD version_len;
+
+    if (preferred_name != NULL) {
+        rt_snprintf(name_buffer, sizeof(name_buffer), "%s", preferred_name);
+    }
+
+    rc = get_device_guid(device_guid, sizeof(device_guid), name_buffer, sizeof(name_buffer));
+    if (rc)
+        return -1;
+
+    rt_snprintf (device_path, sizeof(device_path), "%s%s%s",
+              USERMODEDEVICEDIR,
+              device_guid,
+              TAPSUFFIX);
+
+    handle = CreateFile (
+        device_path,
+        GENERIC_READ | GENERIC_WRITE,
+        0,
+        0,
+        OPEN_EXISTING,
+        FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED,
+        0 );
+
+    if (handle == INVALID_HANDLE_VALUE) {
+        return -1;
+    }
+
+    bret = DeviceIoControl(handle, TAP_IOCTL_GET_VERSION,
+                           &version, sizeof (version),
+                           &version, sizeof (version), &version_len, NULL);
+
+    if (bret == FALSE) {
+        CloseHandle(handle);
+        return -1;
+    }
+
+    if (!tap_win32_set_status(handle, TRUE)) {
+        return -1;
+    }
+
+    tap_win32_overlapped_init(&tap_overlapped, handle);
+
+    *phandle = &tap_overlapped;
+    return 0;
+}
+
+static rt_err_t tap_netif_init(rt_device_t dev)
+{
+	rt_thread_t tid;
+	tap_win32_overlapped_t *handle;
+
+	if (tap_win32_open(&handle, TAP_IFNAME) < 0) {
+		printf("tap: Could not open '%s'\n", TAP_IFNAME);
+		return -RT_ERROR;
+	}
+
+	tap_netif_device.handle = handle;
+
+	/* create recv thread */
+	tid = rt_thread_create("tap", tap_win32_thread_entry, RT_NULL, 
+		2048, RT_THREAD_PRIORITY_MAX - 1, 10);
+	if (tid != RT_NULL)
+	{
+		rt_thread_startup(tid);
+	}
+
+	rt_thread_sleep(RT_TICK_PER_SECOND);
+
+	return RT_EOK;
+}
+
+static rt_err_t tap_netif_open(rt_device_t dev, rt_uint16_t oflag)
+{
+	return RT_EOK;
+}
+
+static rt_err_t tap_netif_close(rt_device_t dev)
+{
+	return RT_EOK;
+}
+
+static rt_size_t tap_netif_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
+{
+	rt_set_errno(-RT_ENOSYS);
+	return 0;
+}
+
+static rt_size_t tap_netif_write (rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size)
+{
+	rt_set_errno(-RT_ENOSYS);
+	return 0;
+}
+
+static rt_err_t tap_netif_control(rt_device_t dev, rt_uint8_t cmd, void *args)
+{
+	switch (cmd)
+	{
+	case NIOCTL_GADDR:
+		/* get mac address */
+		if (args) rt_memcpy(args, tap_netif_device.dev_addr, 6);
+		else return -RT_ERROR;
+		break;
+
+	default :
+		break;
+	}
+
+	return RT_EOK;
+}
+
+rt_err_t tap_netif_tx( rt_device_t dev, struct pbuf* p)
+{
+	struct pbuf *q;
+	char buffer[2048];
+	int length;
+	tap_win32_overlapped_t *handle;
+	unsigned char* ptr;
+
+	handle = NETIF_TAP(dev);
+
+	/* lock EMAC device */
+	rt_sem_take(&sem_lock, RT_WAITING_FOREVER);
+
+	/* copy data to tx buffer */
+	q = p;
+	ptr = (rt_uint8_t*)buffer;
+	while (q)
+	{
+		memcpy(ptr, q->payload, q->len);
+		ptr += q->len;
+		q = q->next;
+	}
+	length = p->tot_len;
+
+	tap_win32_write(handle, buffer, length);
+
+	/* unlock EMAC device */
+	rt_sem_release(&sem_lock);
+
+	return RT_EOK;
+}
+
+struct pbuf *tap_netif_rx(rt_device_t dev)
+{
+	struct pbuf* p = RT_NULL;
+	tap_win32_overlapped_t *handle;
+	rt_uint8_t *buf;
+	int max_size = 4096;
+	int size;
+
+	handle = NETIF_TAP(dev);
+
+	size = tap_win32_read(handle, &buf, max_size);
+	if (size > 0) {
+		p = pbuf_alloc(PBUF_LINK, size, PBUF_RAM);
+		pbuf_take(p, buf, size);
+
+		tap_win32_free_buffer(handle, buf);
+	}
+
+	return p;
+}
+
+void tap_netif_hw_init(void)
+{
+	rt_sem_init(&sem_lock, "eth_lock", 1, RT_IPC_FLAG_FIFO);
+
+	tap_netif_device.dev_addr[0] = 0x00;
+	tap_netif_device.dev_addr[1] = 0x60;
+	tap_netif_device.dev_addr[2] = 0x37;
+	/* set mac address: (only for test) */
+	tap_netif_device.dev_addr[3] = 0x12;
+	tap_netif_device.dev_addr[4] = 0x34;
+	tap_netif_device.dev_addr[5] = 0x56;
+
+	tap_netif_device.parent.parent.init		= tap_netif_init;
+	tap_netif_device.parent.parent.open		= tap_netif_open;
+	tap_netif_device.parent.parent.close	= tap_netif_close;
+	tap_netif_device.parent.parent.read		= tap_netif_read;
+	tap_netif_device.parent.parent.write	= tap_netif_write;
+	tap_netif_device.parent.parent.control	= tap_netif_control;
+	tap_netif_device.parent.parent.user_data= RT_NULL;
+
+	tap_netif_device.parent.eth_rx			= tap_netif_rx;
+	tap_netif_device.parent.eth_tx			= tap_netif_tx;
+
+	eth_device_init(&(tap_netif_device.parent), "e0");
+}