关于Win7 Native WiFi的一点疑惑【成功创建一个MAC】

刚才测试了Win7自带的无线网卡驱动使用的NDIS版本号。虽然之前不能肯定，但是一直觉得是6.20，因为他能支持virutal wifi 中的hosted network.这个应该是6.20才可能支持的，但是不完全肯定，主要理由是因为我使用OID_DOT11_CREATE_MAC 这个OID时，虽然返回成功，但是没有返回DOT11_MAC_INFO 因为返回的的缓冲区可读数据为0.所以疑惑就在这里：

写道

Virtual WiFi allows an 802.11 miniport driver to connect to, or host, multiple simultaneous connections on a single wireless interface. Beginning with Windows 7, an 802.11 miniport driver must support Virtual WiFi. You must compile or recompile the driver with the NTDDI_VERSION macro set to >= NTDDI_WIN7. In addition, the driver must support NDIS version 6.20.

 现在既然是6.20的版本，而且OID_DOT11_CREATE_MAC返回Success的状态。可是就是没有返回创建New MAC的信息，包括端口号和MAC地址。

Oid =  	OID_GEN_DRIVER_VERSION;
	    Status = filterDoInternalRequest(pFilter,
	                                 NdisRequestQueryInformation,
									 Oid,
									 &InformationBuffer,
									 sizeof(InformationBuffer),
									 sizeof(InformationBuffer),
									 MethodId,
									 &BytesProcessed); 
		if(Status == NDIS_STATUS_SUCCESS){
          DEBUGP(DL_TEST,("Delete a new mac successfully!\n"));
          VersionHighByte = (InformationBuffer & 0xFF00) >> 8;
		  VersionLowByte = (InformationBuffer & 0x00FF);
		  DEBUGP(DL_TEST,("Ndis version:High %x, and Low: %x\n",VersionHighByte,VersionLowByte));
		}

 返回的值高位=0x6，低位=0x14(20)

所以现在的唯一的方法就是返回OID_GEN_SUPPORTED_LIST。 看看返回链表中是否有OID_DOT11_CREATE_MAC。

一般在驱动中都会定义该驱动支持的OID链表：

 UINT supportedOIDs[] =   
 {   
     //   
     // General required OIDs.   
     //   
    
     OID_GEN_SUPPORTED_LIST,   
     OID_GEN_HARDWARE_STATUS,   
     OID_GEN_MEDIA_SUPPORTED,   
     OID_GEN_MEDIA_IN_USE,   
     OID_GEN_MAXIMUM_LOOKAHEAD,   
     OID_GEN_MAXIMUM_FRAME_SIZE,   
     OID_GEN_LINK_SPEED,   
}；

 当有需要返回整个链表的时候：

 case OID_GEN_SUPPORTED_LIST:   
             infoSizeNeeded = sizeof(supportedOIDs);  
             NdisMoveMemory(   
                             InformationBuffer,   
                             (PVOID)supportedOIDs,   
                             sizeof(supportedOIDs)   
                             );   
    
                 break;   

 所以返回的list的size和关于数组的指针。虽然知道每个OID的是uint类型的，可是现在怎么把他们打印出来，成了问题。如果直接*(information+4*i),参考 General Operational Characteristics ，估计是数字，而不是字符。这是MSDN的描述：

写道

As a query, the OID_GEN_SUPPORTED_LIST OID specifies an array of OIDs for objects that the miniport driver or a NIC supports. Objects include general, media-specific, and implementation-specific objects.

 最后一句没有明白。

--------------------------------------------2009-12-13------UPDATE-----------------------------------------

之前，由于锁的问题，而我却以为是内存分配的问题。所以对于DOT11_MAC_INFO,使用ULONG informationBuffer来保存，显然空间不够，unsigned long 应该是8个Bytes,而sizeof(DOT11_MAC_INFO) =16.

所以今天测试的时候返回了如下的状态：

写道

NDIS_STATUS_INVALID_LENGTH or NDIS_STATUS_BUFFER_TOO_SHORT
The value specified in the InformationBufferLength member of the NDIS_OID_REQUEST-structured buffer at OidRequest does not match the requirements for the given OID_XXX code. If the information buffer is too small, the BytesNeeded member contains the correct value for InformationBufferLength on return from NdisOidRequest.

 所以需要申请额外的空间：

Oid = OID_DOT11_CREATE_MAC;//OID used to create a new MAC
      
        pFilter = CONTAINING_RECORD(Link, MS_FILTER, FilterModuleLink);
        
        pMacInfo =  (PDOT11_MAC_INFO)NdisAllocateMemoryWithTagPriority(pFilter->FilterHandle, sizeof(DOT11_MAC_INFO), FILTER_ALLOC_TAG, LowPoolPriority);
		NdisZeroMemory(pMacInfo,sizeof(DOT11_MAC_INFO));
	    DEBUGP(DL_TEST,("sizeof DOT11_MAC_INFO is%u!\n",sizeof(DOT11_MAC_INFO)));
		Status = filterDoInternalRequest(pFilter,
	                                  NdisRequestMethod,
									  Oid,
									  pMacInfo,
									  sizeof(DOT11_MAC_INFO),
									  sizeof(DOT11_MAC_INFO),
									  MethodId,
									  &BytesProcessed); 
		 if(Status == NDIS_STATUS_SUCCESS){
           DEBUGP(DL_TEST,("Creae a new mac successfully!\n"));
		   if(BytesProcessed > 0){
            DEBUGP(DL_TEST,("Prot Number is %u\n",pMacInfo->uNdisPortNumber));
            DEBUGP(DL_TEST,("Mac Address is %x-%x-%x-%x-%x-%x\n",pMacInfo->MacAddr[0],pMacInfo->MacAddr[1],pMacInfo->MacAddr[2],pMacInfo->MacAddr[3],pMacInfo->MacAddr[4],pMacInfo->MacAddr[5]));
		   }
		 }else if(Status ==  NDIS_STATUS_OPEN_LIST_FULL)
		 {
          DEBUGP(DL_TEST,("Status is NDIS_STATUS_OPEN_LIST_FULL !\n"));
		 }
		 else
		 {
           DEBUGP(DL_TEST,("Creae a new mac Fail!\n"));
		 } 

 

这下子，好了，可以返回：

00000026    50.94353104    NDISLWF:    
00000027    50.94354630    ==>Filter IO Control dispatch   
00000028    50.94360352    NDISLWF:    
00000029    50.94364929    The input length is 44, and inputdata isRequest from user mode to crate a new MAC.   
00000030    50.94365311        
00000031    50.94380951    NDISLWF:    
00000032    50.94382858    ==>filterDoInternalRequest   
00000033    51.13080597    NDISLWF:    
00000034    51.13083649    BytesProcessed = 16   
00000035    51.13090897    NDISLWF:    
00000036    51.13092422    Creae a new mac successfully!   
00000037    51.13094711    NDISLWF:    
00000038    51.13096237    Prot Number is 1    
00000039    51.13098145    NDISLWF:    
00000040    51.13098526    Filter IO Control dispatch<====   

这个测试没有打印出MAC 地址。

可是奇怪的是，创建成功之后，估计是没有删除，但是没有到达可以创建MAC的上限，当我第二次测试的时候，想把MAC打印出来的时候，发现返回的BytesProcessed=0.可是仍然是创建成功的，当然这个时候没有portnumber了。跟之前的状况有点相似了

-------------------继续更新---------------------

其实不小心犯了一个错误，忘记了将返回的内容写进InformationBuffer:

00000019 23.88084602 Filter IO Control dispatch<==== 
00000020 24.11517906 NDISLWF:  
00000021 24.11519814 ==>Filter IO Control dispatch 
00000022 24.11523628 NDISLWF:  
00000023 24.11548042 The input length is 44, and inputdata isRequest from user mode to crate a new MAC. 
00000024 24.11548805   
00000025 24.11552620 NDISLWF:  
00000026 24.11553955 sizeof DOT11_MAC_INFO is16! 
00000027 24.11557198 NDISLWF:  
00000028 24.11559105 ==>filterDoInternalRequest 
00000029 24.27196312 NDISLWF:  
00000030 24.27199936 Creae a new mac successfully! 
00000031 24.27202034 NDISLWF:  
00000032 24.27203941 Prot Number is 1 
00000033 24.27205467 NDISLWF:  
00000034 24.27209473 Mac Address is 0-14-78-7a-2-a2  
00000035 24.27212715 NDISLWF:  
00000036 24.27213287 Filter IO Control dispatch<==== 

 

 
 那么接下来就是删除等后续动作了,删除就有些失望了：

 
 估计是该驱动不支持？这个不是很可能，因为它已经支持了OID_DOT11_CREATE_MAC,必定支持OID_DOT11_DELETE_MAC.另外查询没有问题：6.20.

评论

1 楼 yexin218 2010-01-04  

Successfylly get ndis version! And Version Info:
Version of Ndis Driver is 6.20
Input your command,like: help
>create
Successfylly Create A new MAC
Port Number is 1, and Mac address is 0-14-78-7a-88-b7
不是所有的都一样的！！