690 lines
20 KiB
C
690 lines
20 KiB
C
/*
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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, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu-common.h"
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#include "net.h"
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#include "sysemu.h"
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#include <stdio.h>
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#include <windows.h>
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#include <winioctl.h>
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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
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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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HANDLE tap_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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(LPBYTE)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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(LPBYTE)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);
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}
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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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}
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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;
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DWORD len;
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int i = 0;
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int stop = 0;
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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);
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if (status != ERROR_SUCCESS) {
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return -1;
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}
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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];
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HKEY connection_key;
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char name_data[256];
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DWORD name_type;
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const char name_string[] = "Name";
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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,
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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 -1;
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}
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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);
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status = RegOpenKeyEx(
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HKEY_LOCAL_MACHINE,
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connection_string,
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0,
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KEY_READ,
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&connection_key);
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if (status == ERROR_SUCCESS) {
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len = sizeof (name_data);
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status = RegQueryValueEx(
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connection_key,
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name_string,
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NULL,
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&name_type,
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(LPBYTE)name_data,
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&len);
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if (status != ERROR_SUCCESS || name_type != REG_SZ) {
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return -1;
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}
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else {
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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) {
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if (strcmp(actual_name, "") != 0) {
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if (strcmp(name_data, actual_name) != 0) {
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RegCloseKey (connection_key);
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++i;
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continue;
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}
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}
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else {
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snprintf(actual_name, actual_name_size, "%s", name_data);
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}
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}
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stop = 1;
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}
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}
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RegCloseKey (connection_key);
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}
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++i;
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}
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RegCloseKey (control_net_key);
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if (stop == 0)
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return -1;
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return 0;
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}
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static int tap_win32_set_status(HANDLE handle, int status)
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{
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unsigned long len = 0;
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return DeviceIoControl(handle, TAP_IOCTL_SET_MEDIA_STATUS,
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&status, sizeof (status),
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&status, sizeof (status), &len, NULL);
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}
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static void tap_win32_overlapped_init(tap_win32_overlapped_t* const overlapped, const HANDLE handle)
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{
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overlapped->handle = handle;
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overlapped->read_event = CreateEvent(NULL, FALSE, FALSE, NULL);
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overlapped->write_event = CreateEvent(NULL, FALSE, FALSE, NULL);
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overlapped->read_overlapped.Offset = 0;
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overlapped->read_overlapped.OffsetHigh = 0;
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overlapped->read_overlapped.hEvent = overlapped->read_event;
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overlapped->write_overlapped.Offset = 0;
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overlapped->write_overlapped.OffsetHigh = 0;
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overlapped->write_overlapped.hEvent = overlapped->write_event;
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InitializeCriticalSection(&overlapped->output_queue_cs);
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InitializeCriticalSection(&overlapped->free_list_cs);
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overlapped->output_queue_semaphore = CreateSemaphore(
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NULL, // default security attributes
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0, // initial count
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TUN_MAX_BUFFER_COUNT, // maximum count
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NULL); // unnamed semaphore
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if(!overlapped->output_queue_semaphore) {
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fprintf(stderr, "error creating output queue semaphore!\n");
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}
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overlapped->free_list_semaphore = CreateSemaphore(
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NULL, // default security attributes
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TUN_MAX_BUFFER_COUNT, // initial count
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TUN_MAX_BUFFER_COUNT, // maximum count
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NULL); // unnamed semaphore
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if(!overlapped->free_list_semaphore) {
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fprintf(stderr, "error creating free list semaphore!\n");
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}
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overlapped->free_list = overlapped->output_queue_front = overlapped->output_queue_back = NULL;
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{
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unsigned index;
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for(index = 0; index < TUN_MAX_BUFFER_COUNT; index++) {
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tun_buffer_t* element = &overlapped->buffers[index];
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element->next = overlapped->free_list;
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overlapped->free_list = element;
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}
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}
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/* To count buffers, initially no-signal. */
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overlapped->tap_semaphore = CreateSemaphore(NULL, 0, TUN_MAX_BUFFER_COUNT, NULL);
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if(!overlapped->tap_semaphore)
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fprintf(stderr, "error creating tap_semaphore.\n");
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}
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static int tap_win32_write(tap_win32_overlapped_t *overlapped,
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const void *buffer, unsigned long size)
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{
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unsigned long write_size;
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BOOL result;
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DWORD error;
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result = GetOverlappedResult( overlapped->handle, &overlapped->write_overlapped,
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&write_size, FALSE);
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if (!result && GetLastError() == ERROR_IO_INCOMPLETE)
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WaitForSingleObject(overlapped->write_event, INFINITE);
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result = WriteFile(overlapped->handle, buffer, size,
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&write_size, &overlapped->write_overlapped);
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if (!result) {
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switch (error = GetLastError())
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{
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case ERROR_IO_PENDING:
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#ifndef TUN_ASYNCHRONOUS_WRITES
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WaitForSingleObject(overlapped->write_event, INFINITE);
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#endif
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break;
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default:
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return -1;
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}
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}
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return 0;
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}
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static DWORD WINAPI tap_win32_thread_entry(LPVOID param)
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{
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tap_win32_overlapped_t *overlapped = (tap_win32_overlapped_t*)param;
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unsigned long read_size;
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BOOL result;
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DWORD dwError;
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tun_buffer_t* buffer = get_buffer_from_free_list(overlapped);
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for (;;) {
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result = ReadFile(overlapped->handle,
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buffer->buffer,
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sizeof(buffer->buffer),
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&read_size,
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&overlapped->read_overlapped);
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if (!result) {
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dwError = GetLastError();
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if (dwError == ERROR_IO_PENDING) {
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WaitForSingleObject(overlapped->read_event, INFINITE);
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result = GetOverlappedResult( overlapped->handle, &overlapped->read_overlapped,
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&read_size, FALSE);
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if (!result) {
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#ifdef DEBUG_TAP_WIN32
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LPVOID lpBuffer;
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dwError = GetLastError();
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FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
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NULL, dwError, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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(LPTSTR) & lpBuffer, 0, NULL );
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fprintf(stderr, "Tap-Win32: Error GetOverlappedResult %d - %s\n", dwError, lpBuffer);
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LocalFree( lpBuffer );
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#endif
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}
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} else {
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#ifdef DEBUG_TAP_WIN32
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LPVOID lpBuffer;
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FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
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NULL, dwError, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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(LPTSTR) & lpBuffer, 0, NULL );
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fprintf(stderr, "Tap-Win32: Error ReadFile %d - %s\n", dwError, lpBuffer);
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LocalFree( lpBuffer );
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#endif
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}
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}
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if(read_size > 0) {
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buffer->read_size = read_size;
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put_buffer_on_output_queue(overlapped, buffer);
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ReleaseSemaphore(overlapped->tap_semaphore, 1, NULL);
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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(vlan, NULL, model, name,
|
|
NULL, tap_receive,
|
|
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;
|
|
}
|