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/*
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* TAP-Win32 -- A kernel driver to provide virtual tap device functionality
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* on Windows. Originally derived from the CIPE-Win32
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* project by Damion K. Wilson, with extensive modifications by
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* James Yonan.
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*
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* All source code which derives from the CIPE-Win32 project is
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* Copyright (C) Damion K. Wilson, 2003, and is released under the
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* GPL version 2 (see below).
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*
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* All other source code is Copyright (C) James Yonan, 2003-2004,
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* and is released under the GPL version 2 (see below).
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (see the file COPYING included with this
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* distribution); if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "vl.h" |
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#include <stdio.h> |
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#include <windows.h> |
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/* NOTE: PCIBus is redefined in winddk.h */
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#define PCIBus _PCIBus
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#include <ddk/ntapi.h> |
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#include <ddk/winddk.h> |
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#include <ddk/ntddk.h> |
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#undef PCIBus
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//=============
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// TAP IOCTLs
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//=============
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#define TAP_CONTROL_CODE(request,method) \
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CTL_CODE (FILE_DEVICE_UNKNOWN, request, method, FILE_ANY_ACCESS) |
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#define TAP_IOCTL_GET_MAC TAP_CONTROL_CODE (1, METHOD_BUFFERED) |
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#define TAP_IOCTL_GET_VERSION TAP_CONTROL_CODE (2, METHOD_BUFFERED) |
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#define TAP_IOCTL_GET_MTU TAP_CONTROL_CODE (3, METHOD_BUFFERED) |
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#define TAP_IOCTL_GET_INFO TAP_CONTROL_CODE (4, METHOD_BUFFERED) |
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#define TAP_IOCTL_CONFIG_POINT_TO_POINT TAP_CONTROL_CODE (5, METHOD_BUFFERED) |
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#define TAP_IOCTL_SET_MEDIA_STATUS TAP_CONTROL_CODE (6, METHOD_BUFFERED) |
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#define TAP_IOCTL_CONFIG_DHCP_MASQ TAP_CONTROL_CODE (7, METHOD_BUFFERED) |
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#define TAP_IOCTL_GET_LOG_LINE TAP_CONTROL_CODE (8, METHOD_BUFFERED) |
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#define TAP_IOCTL_CONFIG_DHCP_SET_OPT TAP_CONTROL_CODE (9, METHOD_BUFFERED) |
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//=================
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// Registry keys
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//=================
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#define ADAPTER_KEY "SYSTEM\\CurrentControlSet\\Control\\Class\\{4D36E972-E325-11CE-BFC1-08002BE10318}" |
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#define NETWORK_CONNECTIONS_KEY "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}" |
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//======================
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// Filesystem prefixes
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//======================
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#define USERMODEDEVICEDIR "\\\\.\\Global\\" |
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#define TAPSUFFIX ".tap" |
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//======================
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// Compile time configuration
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//======================
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//#define DEBUG_TAP_WIN32 1
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#define TUN_ASYNCHRONOUS_WRITES 1 |
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#define TUN_BUFFER_SIZE 1560 |
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#define TUN_MAX_BUFFER_COUNT 32 |
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/*
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* The data member "buffer" must be the first element in the tun_buffer
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* structure. See the function, tap_win32_free_buffer.
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*/
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typedef struct tun_buffer_s { |
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unsigned char buffer [TUN_BUFFER_SIZE]; |
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unsigned long read_size; |
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struct tun_buffer_s* next;
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} tun_buffer_t; |
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typedef struct tap_win32_overlapped { |
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HANDLE handle; |
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HANDLE read_event; |
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HANDLE write_event; |
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HANDLE output_queue_semaphore; |
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HANDLE free_list_semaphore; |
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CRITICAL_SECTION output_queue_cs; |
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CRITICAL_SECTION free_list_cs; |
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OVERLAPPED read_overlapped; |
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OVERLAPPED write_overlapped; |
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tun_buffer_t buffers[TUN_MAX_BUFFER_COUNT]; |
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tun_buffer_t* free_list; |
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tun_buffer_t* output_queue_front; |
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tun_buffer_t* output_queue_back; |
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} tap_win32_overlapped_t; |
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static tap_win32_overlapped_t tap_overlapped;
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static tun_buffer_t* get_buffer_from_free_list(tap_win32_overlapped_t* const overlapped) |
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{ |
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tun_buffer_t* buffer = NULL;
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WaitForSingleObject(overlapped->free_list_semaphore, INFINITE); |
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EnterCriticalSection(&overlapped->free_list_cs); |
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buffer = overlapped->free_list; |
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// assert(buffer != NULL);
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overlapped->free_list = buffer->next; |
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LeaveCriticalSection(&overlapped->free_list_cs); |
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buffer->next = NULL;
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return buffer;
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} |
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static void put_buffer_on_free_list(tap_win32_overlapped_t* const overlapped, tun_buffer_t* const buffer) |
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{ |
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EnterCriticalSection(&overlapped->free_list_cs); |
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buffer->next = overlapped->free_list; |
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overlapped->free_list = buffer; |
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LeaveCriticalSection(&overlapped->free_list_cs); |
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ReleaseSemaphore(overlapped->free_list_semaphore, 1, NULL); |
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} |
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static tun_buffer_t* get_buffer_from_output_queue(tap_win32_overlapped_t* const overlapped, const int block) |
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{ |
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tun_buffer_t* buffer = NULL;
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DWORD result, timeout = block ? INFINITE : 0L;
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// Non-blocking call
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result = WaitForSingleObject(overlapped->output_queue_semaphore, timeout); |
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switch (result)
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{ |
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// The semaphore object was signaled.
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case WAIT_OBJECT_0:
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EnterCriticalSection(&overlapped->output_queue_cs); |
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buffer = overlapped->output_queue_front; |
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overlapped->output_queue_front = buffer->next; |
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if(overlapped->output_queue_front == NULL) { |
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overlapped->output_queue_back = NULL;
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} |
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LeaveCriticalSection(&overlapped->output_queue_cs); |
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break;
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// Semaphore was nonsignaled, so a time-out occurred.
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case WAIT_TIMEOUT:
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// Cannot open another window.
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break;
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} |
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return buffer;
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} |
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static tun_buffer_t* get_buffer_from_output_queue_immediate (tap_win32_overlapped_t* const overlapped) |
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{ |
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return get_buffer_from_output_queue(overlapped, 0); |
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} |
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static void put_buffer_on_output_queue(tap_win32_overlapped_t* const overlapped, tun_buffer_t* const buffer) |
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{ |
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EnterCriticalSection(&overlapped->output_queue_cs); |
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if(overlapped->output_queue_front == NULL && overlapped->output_queue_back == NULL) { |
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overlapped->output_queue_front = overlapped->output_queue_back = buffer; |
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} else {
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buffer->next = NULL;
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overlapped->output_queue_back->next = buffer; |
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overlapped->output_queue_back = buffer; |
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} |
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LeaveCriticalSection(&overlapped->output_queue_cs); |
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ReleaseSemaphore(overlapped->output_queue_semaphore, 1, NULL); |
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} |
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static int is_tap_win32_dev(const char *guid) |
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{ |
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HKEY netcard_key; |
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LONG status; |
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DWORD len; |
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int i = 0; |
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status = RegOpenKeyEx( |
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HKEY_LOCAL_MACHINE, |
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ADAPTER_KEY, |
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0,
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KEY_READ, |
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&netcard_key); |
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if (status != ERROR_SUCCESS) {
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return FALSE;
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} |
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for (;;) {
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char enum_name[256]; |
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char unit_string[256]; |
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HKEY unit_key; |
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char component_id_string[] = "ComponentId"; |
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char component_id[256]; |
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char net_cfg_instance_id_string[] = "NetCfgInstanceId"; |
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char net_cfg_instance_id[256]; |
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DWORD data_type; |
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len = sizeof (enum_name);
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status = RegEnumKeyEx( |
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netcard_key, |
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i, |
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enum_name, |
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&len, |
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NULL,
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NULL,
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NULL,
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NULL);
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if (status == ERROR_NO_MORE_ITEMS)
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break;
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else if (status != ERROR_SUCCESS) { |
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return FALSE;
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} |
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snprintf (unit_string, sizeof(unit_string), "%s\\%s", |
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ADAPTER_KEY, enum_name); |
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status = RegOpenKeyEx( |
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HKEY_LOCAL_MACHINE, |
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unit_string, |
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0,
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KEY_READ, |
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&unit_key); |
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if (status != ERROR_SUCCESS) {
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return FALSE;
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} else {
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len = sizeof (component_id);
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status = RegQueryValueEx( |
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unit_key, |
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component_id_string, |
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NULL,
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&data_type, |
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component_id, |
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&len); |
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if (!(status != ERROR_SUCCESS || data_type != REG_SZ)) {
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len = sizeof (net_cfg_instance_id);
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status = RegQueryValueEx( |
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unit_key, |
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net_cfg_instance_id_string, |
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NULL,
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&data_type, |
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net_cfg_instance_id, |
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&len); |
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if (status == ERROR_SUCCESS && data_type == REG_SZ) {
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if (/* !strcmp (component_id, TAP_COMPONENT_ID) &&*/ |
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!strcmp (net_cfg_instance_id, guid)) { |
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RegCloseKey (unit_key); |
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RegCloseKey (netcard_key); |
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return TRUE;
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} |
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} |
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} |
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RegCloseKey (unit_key); |
277 |
} |
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++i; |
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} |
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RegCloseKey (netcard_key); |
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return FALSE;
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} |
284 |
|
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static int get_device_guid( |
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char *name,
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int name_size,
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char *actual_name,
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int actual_name_size)
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{ |
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LONG status; |
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HKEY control_net_key; |
293 |
DWORD len; |
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int i = 0; |
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int stop = 0; |
296 |
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status = RegOpenKeyEx( |
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HKEY_LOCAL_MACHINE, |
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NETWORK_CONNECTIONS_KEY, |
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0,
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KEY_READ, |
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&control_net_key); |
303 |
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if (status != ERROR_SUCCESS) {
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return -1; |
306 |
} |
307 |
|
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while (!stop)
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{ |
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char enum_name[256]; |
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char connection_string[256]; |
312 |
HKEY connection_key; |
313 |
char name_data[256]; |
314 |
DWORD name_type; |
315 |
const char name_string[] = "Name"; |
316 |
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len = sizeof (enum_name);
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status = RegEnumKeyEx( |
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control_net_key, |
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i, |
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enum_name, |
322 |
&len, |
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NULL,
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NULL,
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NULL,
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NULL);
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if (status == ERROR_NO_MORE_ITEMS)
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break;
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else if (status != ERROR_SUCCESS) { |
331 |
return -1; |
332 |
} |
333 |
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snprintf(connection_string, |
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sizeof(connection_string),
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"%s\\%s\\Connection",
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NETWORK_CONNECTIONS_KEY, enum_name); |
338 |
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status = RegOpenKeyEx( |
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HKEY_LOCAL_MACHINE, |
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connection_string, |
342 |
0,
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KEY_READ, |
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&connection_key); |
345 |
|
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if (status == ERROR_SUCCESS) {
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len = sizeof (name_data);
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status = RegQueryValueEx( |
349 |
connection_key, |
350 |
name_string, |
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NULL,
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&name_type, |
353 |
name_data, |
354 |
&len); |
355 |
|
356 |
if (status != ERROR_SUCCESS || name_type != REG_SZ) {
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return -1; |
358 |
} |
359 |
else {
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360 |
if (is_tap_win32_dev(enum_name)) {
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snprintf(name, name_size, "%s", enum_name);
|
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if (actual_name) {
|
363 |
if (strcmp(actual_name, "") != 0) { |
364 |
if (strcmp(name_data, actual_name) != 0) { |
365 |
RegCloseKey (connection_key); |
366 |
++i; |
367 |
continue;
|
368 |
} |
369 |
} |
370 |
else {
|
371 |
snprintf(actual_name, actual_name_size, "%s", name_data);
|
372 |
} |
373 |
} |
374 |
stop = 1;
|
375 |
} |
376 |
} |
377 |
|
378 |
RegCloseKey (connection_key); |
379 |
} |
380 |
++i; |
381 |
} |
382 |
|
383 |
RegCloseKey (control_net_key); |
384 |
|
385 |
if (stop == 0) |
386 |
return -1; |
387 |
|
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return 0; |
389 |
} |
390 |
|
391 |
static int tap_win32_set_status(HANDLE handle, int status) |
392 |
{ |
393 |
unsigned long len = 0; |
394 |
|
395 |
return DeviceIoControl(handle, TAP_IOCTL_SET_MEDIA_STATUS,
|
396 |
&status, sizeof (status),
|
397 |
&status, sizeof (status), &len, NULL); |
398 |
} |
399 |
|
400 |
static void tap_win32_overlapped_init(tap_win32_overlapped_t* const overlapped, const HANDLE handle) |
401 |
{ |
402 |
overlapped->handle = handle; |
403 |
|
404 |
overlapped->read_event = CreateEvent(NULL, FALSE, FALSE, NULL); |
405 |
overlapped->write_event = CreateEvent(NULL, FALSE, FALSE, NULL); |
406 |
|
407 |
overlapped->read_overlapped.Offset = 0;
|
408 |
overlapped->read_overlapped.OffsetHigh = 0;
|
409 |
overlapped->read_overlapped.hEvent = overlapped->read_event; |
410 |
|
411 |
overlapped->write_overlapped.Offset = 0;
|
412 |
overlapped->write_overlapped.OffsetHigh = 0;
|
413 |
overlapped->write_overlapped.hEvent = overlapped->write_event; |
414 |
|
415 |
InitializeCriticalSection(&overlapped->output_queue_cs); |
416 |
InitializeCriticalSection(&overlapped->free_list_cs); |
417 |
|
418 |
overlapped->output_queue_semaphore = CreateSemaphore( |
419 |
NULL, // default security attributes |
420 |
0, // initial count |
421 |
TUN_MAX_BUFFER_COUNT, // maximum count
|
422 |
NULL); // unnamed semaphore |
423 |
|
424 |
if(!overlapped->output_queue_semaphore) {
|
425 |
fprintf(stderr, "error creating output queue semaphore!\n");
|
426 |
} |
427 |
|
428 |
overlapped->free_list_semaphore = CreateSemaphore( |
429 |
NULL, // default security attributes |
430 |
TUN_MAX_BUFFER_COUNT, // initial count
|
431 |
TUN_MAX_BUFFER_COUNT, // maximum count
|
432 |
NULL); // unnamed semaphore |
433 |
|
434 |
if(!overlapped->free_list_semaphore) {
|
435 |
fprintf(stderr, "error creating free list semaphore!\n");
|
436 |
} |
437 |
|
438 |
overlapped->free_list = overlapped->output_queue_front = overlapped->output_queue_back = NULL;
|
439 |
|
440 |
{ |
441 |
unsigned index;
|
442 |
for(index = 0; index < TUN_MAX_BUFFER_COUNT; index++) { |
443 |
tun_buffer_t* element = &overlapped->buffers[index]; |
444 |
element->next = overlapped->free_list; |
445 |
overlapped->free_list = element; |
446 |
} |
447 |
} |
448 |
} |
449 |
|
450 |
static int tap_win32_write(tap_win32_overlapped_t *overlapped, |
451 |
const void *buffer, unsigned long size) |
452 |
{ |
453 |
unsigned long write_size; |
454 |
BOOL result; |
455 |
DWORD error; |
456 |
|
457 |
result = GetOverlappedResult( overlapped->handle, &overlapped->write_overlapped, |
458 |
&write_size, FALSE); |
459 |
|
460 |
if (!result && GetLastError() == ERROR_IO_INCOMPLETE)
|
461 |
WaitForSingleObject(overlapped->write_event, INFINITE); |
462 |
|
463 |
result = WriteFile(overlapped->handle, buffer, size, |
464 |
&write_size, &overlapped->write_overlapped); |
465 |
|
466 |
if (!result) {
|
467 |
switch (error = GetLastError())
|
468 |
{ |
469 |
case ERROR_IO_PENDING:
|
470 |
#ifndef TUN_ASYNCHRONOUS_WRITES
|
471 |
WaitForSingleObject(overlapped->write_event, INFINITE); |
472 |
#endif
|
473 |
break;
|
474 |
default:
|
475 |
return -1; |
476 |
} |
477 |
} |
478 |
|
479 |
return 0; |
480 |
} |
481 |
|
482 |
static DWORD WINAPI tap_win32_thread_entry(LPVOID param)
|
483 |
{ |
484 |
tap_win32_overlapped_t *overlapped = (tap_win32_overlapped_t*)param; |
485 |
unsigned long read_size; |
486 |
BOOL result; |
487 |
DWORD dwError; |
488 |
tun_buffer_t* buffer = get_buffer_from_free_list(overlapped); |
489 |
|
490 |
|
491 |
for (;;) {
|
492 |
result = ReadFile(overlapped->handle, |
493 |
buffer->buffer, |
494 |
sizeof(buffer->buffer),
|
495 |
&read_size, |
496 |
&overlapped->read_overlapped); |
497 |
if (!result) {
|
498 |
dwError = GetLastError(); |
499 |
if (dwError == ERROR_IO_PENDING) {
|
500 |
WaitForSingleObject(overlapped->read_event, INFINITE); |
501 |
result = GetOverlappedResult( overlapped->handle, &overlapped->read_overlapped, |
502 |
&read_size, FALSE); |
503 |
if (!result) {
|
504 |
#if DEBUG_TAP_WIN32
|
505 |
LPVOID lpBuffer; |
506 |
dwError = GetLastError(); |
507 |
FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, |
508 |
NULL, dwError, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
|
509 |
(LPTSTR) & lpBuffer, 0, NULL ); |
510 |
fprintf(stderr, "Tap-Win32: Error GetOverlappedResult %d - %s\n", dwError, lpBuffer);
|
511 |
LocalFree( lpBuffer ); |
512 |
#endif
|
513 |
} |
514 |
} else {
|
515 |
#if DEBUG_TAP_WIN32
|
516 |
LPVOID lpBuffer; |
517 |
FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, |
518 |
NULL, dwError, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
|
519 |
(LPTSTR) & lpBuffer, 0, NULL ); |
520 |
fprintf(stderr, "Tap-Win32: Error ReadFile %d - %s\n", dwError, lpBuffer);
|
521 |
LocalFree( lpBuffer ); |
522 |
#endif
|
523 |
} |
524 |
} |
525 |
|
526 |
if(read_size > 0) { |
527 |
buffer->read_size = read_size; |
528 |
put_buffer_on_output_queue(overlapped, buffer); |
529 |
buffer = get_buffer_from_free_list(overlapped); |
530 |
} |
531 |
} |
532 |
|
533 |
return 0; |
534 |
} |
535 |
|
536 |
static int tap_win32_read(tap_win32_overlapped_t *overlapped, |
537 |
uint8_t **pbuf, int max_size)
|
538 |
{ |
539 |
int size = 0; |
540 |
|
541 |
tun_buffer_t* buffer = get_buffer_from_output_queue_immediate(overlapped); |
542 |
|
543 |
if(buffer != NULL) { |
544 |
*pbuf = buffer->buffer; |
545 |
size = (int)buffer->read_size;
|
546 |
if(size > max_size) {
|
547 |
size = max_size; |
548 |
} |
549 |
} |
550 |
|
551 |
return size;
|
552 |
} |
553 |
|
554 |
static void tap_win32_free_buffer(tap_win32_overlapped_t *overlapped, |
555 |
char* pbuf)
|
556 |
{ |
557 |
tun_buffer_t* buffer = (tun_buffer_t*)pbuf; |
558 |
put_buffer_on_free_list(overlapped, buffer); |
559 |
} |
560 |
|
561 |
static int tap_win32_open(tap_win32_overlapped_t **phandle, |
562 |
const char *prefered_name) |
563 |
{ |
564 |
char device_path[256]; |
565 |
char device_guid[0x100]; |
566 |
int rc;
|
567 |
HANDLE handle; |
568 |
BOOL bret; |
569 |
char name_buffer[0x100] = {0, }; |
570 |
struct {
|
571 |
unsigned long major; |
572 |
unsigned long minor; |
573 |
unsigned long debug; |
574 |
} version; |
575 |
LONG version_len; |
576 |
DWORD idThread; |
577 |
HANDLE hThread; |
578 |
|
579 |
if (prefered_name != NULL) |
580 |
snprintf(name_buffer, sizeof(name_buffer), "%s", prefered_name); |
581 |
|
582 |
rc = get_device_guid(device_guid, sizeof(device_guid), name_buffer, sizeof(name_buffer)); |
583 |
if (rc)
|
584 |
return -1; |
585 |
|
586 |
snprintf (device_path, sizeof(device_path), "%s%s%s", |
587 |
USERMODEDEVICEDIR, |
588 |
device_guid, |
589 |
TAPSUFFIX); |
590 |
|
591 |
handle = CreateFile ( |
592 |
device_path, |
593 |
GENERIC_READ | GENERIC_WRITE, |
594 |
0,
|
595 |
0,
|
596 |
OPEN_EXISTING, |
597 |
FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, |
598 |
0 );
|
599 |
|
600 |
if (handle == INVALID_HANDLE_VALUE) {
|
601 |
return -1; |
602 |
} |
603 |
|
604 |
bret = DeviceIoControl(handle, TAP_IOCTL_GET_VERSION, |
605 |
&version, sizeof (version),
|
606 |
&version, sizeof (version), &version_len, NULL); |
607 |
|
608 |
if (bret == FALSE) {
|
609 |
CloseHandle(handle); |
610 |
return -1; |
611 |
} |
612 |
|
613 |
if (!tap_win32_set_status(handle, TRUE)) {
|
614 |
return -1; |
615 |
} |
616 |
|
617 |
tap_win32_overlapped_init(&tap_overlapped, handle); |
618 |
|
619 |
*phandle = &tap_overlapped; |
620 |
|
621 |
hThread = CreateThread(NULL, 0, tap_win32_thread_entry, |
622 |
(LPVOID)&tap_overlapped, 0, &idThread);
|
623 |
SetThreadPriority(hThread,THREAD_PRIORITY_TIME_CRITICAL); |
624 |
|
625 |
return 0; |
626 |
} |
627 |
|
628 |
/********************************************/
|
629 |
|
630 |
typedef struct TAPState { |
631 |
VLANClientState *vc; |
632 |
tap_win32_overlapped_t *handle; |
633 |
} TAPState; |
634 |
|
635 |
static TAPState *tap_win32_state = NULL; |
636 |
|
637 |
static void tap_receive(void *opaque, const uint8_t *buf, int size) |
638 |
{ |
639 |
TAPState *s = opaque; |
640 |
|
641 |
tap_win32_write(s->handle, buf, size); |
642 |
} |
643 |
|
644 |
/* XXX: horrible, suppress this by using proper thread signaling */
|
645 |
void tap_win32_poll(void) |
646 |
{ |
647 |
TAPState *s = tap_win32_state; |
648 |
uint8_t *buf; |
649 |
int max_size = 4096; |
650 |
int size;
|
651 |
|
652 |
if (!s)
|
653 |
return;
|
654 |
|
655 |
size = tap_win32_read(s->handle, &buf, max_size); |
656 |
if (size > 0) { |
657 |
qemu_send_packet(s->vc, buf, size); |
658 |
tap_win32_free_buffer(s->handle, buf); |
659 |
} |
660 |
} |
661 |
|
662 |
int tap_win32_init(VLANState *vlan, const char *ifname) |
663 |
{ |
664 |
TAPState *s; |
665 |
|
666 |
s = qemu_mallocz(sizeof(TAPState));
|
667 |
if (!s)
|
668 |
return -1; |
669 |
if (tap_win32_open(&s->handle, ifname) < 0) { |
670 |
printf("tap: Could not open '%s'\n", ifname);
|
671 |
return -1; |
672 |
} |
673 |
|
674 |
s->vc = qemu_new_vlan_client(vlan, tap_receive, NULL, s);
|
675 |
|
676 |
snprintf(s->vc->info_str, sizeof(s->vc->info_str),
|
677 |
"tap: ifname=%s", ifname);
|
678 |
tap_win32_state = s; |
679 |
return 0; |
680 |
} |