Patchwork [03/15] net: move tap-win32.c under net/

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Submitter Mark McLoughlin
Date Oct. 22, 2009, 4:49 p.m.
Message ID <1256230156-29652-4-git-send-email-markmc@redhat.com>
Download mbox | patch
Permalink /patch/36716/
State New
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Mark McLoughlin - Oct. 22, 2009, 4:49 p.m.
Signed-off-by: Mark McLoughlin <markmc@redhat.com>
---
 Makefile        |    2 +-
 net/tap-win32.c |  690 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tap-win32.c     |  690 -------------------------------------------------------
 3 files changed, 691 insertions(+), 691 deletions(-)
 create mode 100644 net/tap-win32.c
 delete mode 100644 tap-win32.c

Patch

diff --git a/Makefile b/Makefile
index c8c0b18..a49177f 100644
--- a/Makefile
+++ b/Makefile
@@ -88,6 +88,7 @@  block-obj-y +=  $(addprefix block/, $(block-nested-y))
 
 net-obj-y = net.o
 net-nested-y = queue.o checksum.o
+net-nested-$(CONFIG_WIN32) += tap-win32.o
 net-obj-y += $(addprefix net/, $(net-nested-y))
 
 ######################################################################
@@ -132,7 +133,6 @@  obj-y += qdev.o qdev-properties.o
 obj-y += qint.o qstring.o qdict.o qlist.o qemu-config.o
 
 obj-$(CONFIG_BRLAPI) += baum.o
-obj-$(CONFIG_WIN32) += tap-win32.o
 obj-$(CONFIG_POSIX) += migration-exec.o migration-unix.o migration-fd.o
 
 audio/audio.o audio/fmodaudio.o: QEMU_CFLAGS += $(FMOD_CFLAGS)
diff --git a/net/tap-win32.c b/net/tap-win32.c
new file mode 100644
index 0000000..7d92df2
--- /dev/null
+++ b/net/tap-win32.c
@@ -0,0 +1,690 @@ 
+/*
+ *  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 "qemu-common.h"
+#include "net.h"
+#include "sysemu.h"
+#include <stdio.h>
+#include <windows.h>
+#include <winioctl.h>
+
+//=============
+// 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;
+
+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;
+//    assert(buffer != NULL);
+    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;
+        }
+
+        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;
+        }
+
+        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)) {
+                    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 {
+                            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 0;
+}
+
+static DWORD WINAPI tap_win32_thread_entry(LPVOID param)
+{
+    tap_win32_overlapped_t *overlapped = (tap_win32_overlapped_t*)param;
+    unsigned long read_size;
+    BOOL result;
+    DWORD dwError;
+    tun_buffer_t* 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) {
+            buffer->read_size = read_size;
+            put_buffer_on_output_queue(overlapped, buffer);
+            ReleaseSemaphore(overlapped->tap_semaphore, 1, NULL);
+            buffer = get_buffer_from_free_list(overlapped);
+        }
+    }
+
+    return 0;
+}
+
+static int tap_win32_read(tap_win32_overlapped_t *overlapped,
+                          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,
+                                  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 *prefered_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;
+    DWORD idThread;
+    HANDLE hThread;
+
+    if (prefered_name != NULL)
+        snprintf(name_buffer, sizeof(name_buffer), "%s", prefered_name);
+
+    rc = get_device_guid(device_guid, sizeof(device_guid), name_buffer, sizeof(name_buffer));
+    if (rc)
+        return -1;
+
+    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;
+
+    hThread = CreateThread(NULL, 0, tap_win32_thread_entry,
+                           (LPVOID)&tap_overlapped, 0, &idThread);
+    return 0;
+}
+
+/********************************************/
+
+ typedef struct TAPState {
+     VLANClientState *vc;
+     tap_win32_overlapped_t *handle;
+ } TAPState;
+
+static void tap_cleanup(VLANClientState *vc)
+{
+    TAPState *s = vc->opaque;
+
+    qemu_del_wait_object(s->handle->tap_semaphore, NULL, NULL);
+
+    /* FIXME: need to kill thread and close file handle:
+       tap_win32_close(s);
+    */
+    qemu_free(s);
+}
+
+static ssize_t tap_receive(VLANClientState *vc, const uint8_t *buf, size_t size)
+{
+    TAPState *s = vc->opaque;
+
+    return tap_win32_write(s->handle, buf, size);
+}
+
+static void tap_win32_send(void *opaque)
+{
+    TAPState *s = opaque;
+    uint8_t *buf;
+    int max_size = 4096;
+    int size;
+
+    size = tap_win32_read(s->handle, &buf, max_size);
+    if (size > 0) {
+        qemu_send_packet(s->vc, buf, size);
+        tap_win32_free_buffer(s->handle, buf);
+    }
+}
+
+int tap_win32_init(VLANState *vlan, const char *model,
+                   const char *name, const char *ifname)
+{
+    TAPState *s;
+
+    s = qemu_mallocz(sizeof(TAPState));
+    if (!s)
+        return -1;
+    if (tap_win32_open(&s->handle, ifname) < 0) {
+        printf("tap: Could not open '%s'\n", ifname);
+        return -1;
+    }
+
+    s->vc = qemu_new_vlan_client(NET_CLIENT_TYPE_TAP,
+                                 vlan, NULL, model, name,
+                                 NULL, tap_receive,
+                                 NULL, NULL, tap_cleanup, s);
+
+    snprintf(s->vc->info_str, sizeof(s->vc->info_str),
+             "tap: ifname=%s", ifname);
+
+    qemu_add_wait_object(s->handle->tap_semaphore, tap_win32_send, s);
+    return 0;
+}
diff --git a/tap-win32.c b/tap-win32.c
deleted file mode 100644
index 7d92df2..0000000
--- a/tap-win32.c
+++ /dev/null
@@ -1,690 +0,0 @@ 
-/*
- *  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 "qemu-common.h"
-#include "net.h"
-#include "sysemu.h"
-#include <stdio.h>
-#include <windows.h>
-#include <winioctl.h>
-
-//=============
-// 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;
-
-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;
-//    assert(buffer != NULL);
-    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;
-        }
-
-        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;
-        }
-
-        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)) {
-                    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 {
-                            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 0;
-}
-
-static DWORD WINAPI tap_win32_thread_entry(LPVOID param)
-{
-    tap_win32_overlapped_t *overlapped = (tap_win32_overlapped_t*)param;
-    unsigned long read_size;
-    BOOL result;
-    DWORD dwError;
-    tun_buffer_t* 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) {
-            buffer->read_size = read_size;
-            put_buffer_on_output_queue(overlapped, buffer);
-            ReleaseSemaphore(overlapped->tap_semaphore, 1, NULL);
-            buffer = get_buffer_from_free_list(overlapped);
-        }
-    }
-
-    return 0;
-}
-
-static int tap_win32_read(tap_win32_overlapped_t *overlapped,
-                          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,
-                                  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 *prefered_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;
-    DWORD idThread;
-    HANDLE hThread;
-
-    if (prefered_name != NULL)
-        snprintf(name_buffer, sizeof(name_buffer), "%s", prefered_name);
-
-    rc = get_device_guid(device_guid, sizeof(device_guid), name_buffer, sizeof(name_buffer));
-    if (rc)
-        return -1;
-
-    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;
-
-    hThread = CreateThread(NULL, 0, tap_win32_thread_entry,
-                           (LPVOID)&tap_overlapped, 0, &idThread);
-    return 0;
-}
-
-/********************************************/
-
- typedef struct TAPState {
-     VLANClientState *vc;
-     tap_win32_overlapped_t *handle;
- } TAPState;
-
-static void tap_cleanup(VLANClientState *vc)
-{
-    TAPState *s = vc->opaque;
-
-    qemu_del_wait_object(s->handle->tap_semaphore, NULL, NULL);
-
-    /* FIXME: need to kill thread and close file handle:
-       tap_win32_close(s);
-    */
-    qemu_free(s);
-}
-
-static ssize_t tap_receive(VLANClientState *vc, const uint8_t *buf, size_t size)
-{
-    TAPState *s = vc->opaque;
-
-    return tap_win32_write(s->handle, buf, size);
-}
-
-static void tap_win32_send(void *opaque)
-{
-    TAPState *s = opaque;
-    uint8_t *buf;
-    int max_size = 4096;
-    int size;
-
-    size = tap_win32_read(s->handle, &buf, max_size);
-    if (size > 0) {
-        qemu_send_packet(s->vc, buf, size);
-        tap_win32_free_buffer(s->handle, buf);
-    }
-}
-
-int tap_win32_init(VLANState *vlan, const char *model,
-                   const char *name, const char *ifname)
-{
-    TAPState *s;
-
-    s = qemu_mallocz(sizeof(TAPState));
-    if (!s)
-        return -1;
-    if (tap_win32_open(&s->handle, ifname) < 0) {
-        printf("tap: Could not open '%s'\n", ifname);
-        return -1;
-    }
-
-    s->vc = qemu_new_vlan_client(NET_CLIENT_TYPE_TAP,
-                                 vlan, NULL, model, name,
-                                 NULL, tap_receive,
-                                 NULL, NULL, tap_cleanup, s);
-
-    snprintf(s->vc->info_str, sizeof(s->vc->info_str),
-             "tap: ifname=%s", ifname);
-
-    qemu_add_wait_object(s->handle->tap_semaphore, tap_win32_send, s);
-    return 0;
-}