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WSCSetProviderInfo32 function

Note  Layered Service Providers are deprecated. Starting with Windows 8 and Windows Server 2012, use Windows Filtering Platform.

The WSCSetProviderInfo32 function sets the data value for specified information class for a layered service provider (LSP).

Note  This call is a strictly 32-bit version of WSCSetProviderInfo for use on 64-bit platforms. It is provided to allow 64-bit processes to access the 32-bit catalogs.


int WSPAPI WSCSetProviderInfo32(
  _In_  LPGUID                 lpProviderId,
  _In_  PBYTE                  Info,
  _In_  size_t                 InfoSize,
  _In_  DWORD                  Flags,
  _Out_ LPINT                  lpErrno


lpProviderId [in]

A pointer to a globally unique identifier (GUID) for the provider.

InfoType [in]

The information class to be set for this LSP protocol entry.

Info [in]

A pointer to a buffer that contains the information class data to set for the LSP protocol entry.

InfoSize [in]

The size, in bytes, of the buffer pointed to by the Info parameter.

Flags [in]

The flags used to modify the behavior of the WSCSetProviderInfo32 function call.

lpErrno [out]

A pointer to the error code if the function fails.

Return value

If no error occurs, WSCSetProviderInfo32 returns ERROR_SUCCESS (zero). Otherwise, it returns SOCKET_ERROR, and a specific error code is returned in the lpErrno parameter.

Error codeMeaning

The call is not implemented. This error is returned if ProviderInfoAudit is specified in the InfoType parameter.


One or more of the arguments is not in a valid part of the user address space.


One or more of the arguments are invalid.


A nonrecoverable error occurred. This error is returned under several conditions including the following: the user lacks the administrative privileges required to write to the Winsock registry, or a failure occurred when opening a Winsock catalog entry.


Insufficient memory was available. This error is returned when there is insufficient memory to allocate a new catalog entry.



WSCSetProviderInfo32 is a strictly 32-bit version of WSCSetProviderInfo. On a 64-bit computer, all calls not specifically 32-bit (for example, all functions that do not end in "32") operate on the native 64-bit catalog. Processes that execute on a 64-bit computer must use the specific 32-bit function calls to operate on a strictly 32-bit catalog and preserve compatibility. The definitions and semantics of the specific 32-bit calls are the same as their native counterparts.

WSCSetProviderInfo32 is used to set the information class data for a 32-bit layered service provider. When the InfoType parameter is set to ProviderInfoLspCategories, on success WSCSetProviderInfo32 sets appropriate LSP category flags implemented by the provider based on the value passed in the Info parameter.

Winsock 2 accommodates layered protocols. A layered protocol is one that implements only higher level communications functions, while relying on an underlying transport stack for the actual exchange of data with a remote endpoint. An example of a layered protocol or layered service provider would be a security layer that adds protocol to the connection establishment process in order to perform authentication and to establish a mutually agreed upon encryption scheme. Such a security protocol would generally require the services of an underlying reliable transport protocol such as TCP or SPX. The term base protocol refers to a protocol such as TCP or SPX which is capable of performing data communications with a remote endpoint. The term layered protocol is used to describe a protocol that cannot stand alone. A protocol chain would then be defined as one or more layered protocols strung together and anchored by a base protocol. A base protocol has the ChainLen member of the WSAPROTOCOL_INFO structure set to BASE_PROTOCOL which is defined to be 1. A layered protocol has the ChainLen member of the WSAPROTOCOL_INFO structure set to LAYERED_PROTOCOL which is defined to be zero. A protocol chain has the ChainLen member of the WSAPROTOCOL_INFO structure set to greater than 1.

During LSP initialization, the LSP must provide pointers to a number of Winsock SPI functions. These functions will be called during normal processing by the layer directly above the LSP (either another LSP or Ws2_32.dll). An LSP that implements an installable file system (IFS) can selectively choose to provide pointers to functions which are implemented by itself, or pass back the pointers provided by the layer directly below the LSP. Non-IFS LSPs, because they provide their own handles, must implement all of the Winsock SPI functions. This is because each SPI will require the LSP to map all of the socket handles it created to the socket handle of the lower provider (either another LSP or the base protocol). However, all LSPs perform their specific work by doing extra processing on only a subset of the Winsock SPI functions.

It is possible to define LSP categories based upon the subset of SPI functions an LSP implements and the nature of the extra processing performed for each of those functions. By classifying LSPs, as well as classifying applications which use Winsock sockets, it becomes possible to selectively determine if an LSP should be involved in a given process at runtime.

On Windows Vista and later, an LSP can be classified based on how it interacts with Windows Sockets calls and data. An LSP category is an identifiable group of behaviors on a subset of Winsock SPI functions. For example, an HTTP content filter would be categorized as a data inspector (the LSP_INSPECTOR category). The LSP_INSPECTOR category will inspect, but not alter, parameters to data transfer SPI functions. An application can query for the category of an LSP and choose to not load the LSP based on the LSP category and the application's set of permitted LSP categories.

The following table lists categories into which an LSP can be classified.

LSP CategoryDescription
LSP_CRYPTO_COMPRESSThe LSP is a cryptography or data compression provider.
LSP_FIREWALLThe LSP is a firewall provider.
LSP_LOCAL_CACHEThe LSP is a local cache provider.
LSP_INBOUND_MODIFYThe LSP modifies inbound data.
LSP_INSPECTORThe LSP inspects or filters data.
LSP_OUTBOUND_MODIFYThe LSP modifies outbound data.
LSP_PROXYThe LSP acts as a proxy and redirects packets.
LSP_REDIRECTORThe LSP is a network redirector.
LSP_SYSTEMThe LSP is acceptable for use in services and system processes.


An LSP may belong to more than one category. For example, firewall/security LSP could belong to both the inspector (LSP_INSPECTOR) and firewall (LSP_FIREWALL) categories.

If an LSP does not have category set, it is considered to be in the All Other category. This LSP category will not be loaded in services or system processes (for example, lsass, winlogon, and many svchost processes).

The WSCSetProviderInfo32 function can only be called by a user logged on as a member of the Administrators group. If WSCSetProviderInfo32 is called by a user that is not a member of the Administrators group, the function call will fail and WSANO_RECOVERY is returned in the lpErrno parameter. This function can also fail because of user account control (UAC). If an application that contains this function is executed by a user logged on as a member of the Administrators group other than the built-in Administrator, this call will fail unless the application has been marked in the manifest file with a requestedExecutionLevel set to requireAdministrator. If the application on Windows Vista or Windows Server 2008 lacks this manifest file, a user logged on as a member of the Administrators group other than the built-in Administrator must then be executing the application in an enhanced shell as the built-in Administrator (RunAs administrator) for this function to succeed.


Minimum supported client

Windows Vista [desktop apps only]

Minimum supported server

Windows Server 2008 [desktop apps only]







See also

Categorizing Layered Service Providers and Applications



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