diff options
Diffstat (limited to 'net/tap-win32.c')
| -rw-r--r-- | net/tap-win32.c | 690 |
1 files changed, 690 insertions, 0 deletions
diff --git a/net/tap-win32.c b/net/tap-win32.c new file mode 100644 index 0000000000..7d92df2aa3 --- /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; +} |