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qemu-e2k/tap-win32.c
aliguori 7a9f6e4a8d Add a -net name=foo parameter (Mark McLoughlin) 
Allow the user to supply a vlan client name on the command line.

This is probably only useful for management tools so that they can
use their own names rather than parsing the output of 'info network'.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6220 c046a42c-6fe2-441c-8c8c-71466251a162
2009-01-07 17:48:51 +00:00

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/*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "qemu-common.h"
#include "net.h"
#include "sysemu.h"
#include <stdio.h>
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
/* NOTE: PCIBus is redefined in winddk.h */
#define PCIBus _PCIBus
#include <ddk/ntapi.h>
#include <ddk/winddk.h>
#include <ddk/ntddk.h>
#undef PCIBus
//=============
// 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,
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,
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,
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,
char* 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;
LONG 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_receive(void *opaque, const uint8_t *buf, int size)
{
TAPState *s = opaque;
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(vlan, model, name, tap_receive, NULL, 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;
}
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