119 lines
3.4 KiB
C
119 lines
3.4 KiB
C
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/*++
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Copyright (c) 2001-2002 Microsoft Corporation
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Module Name:
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elip6.c
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Abstract:
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This module contains the interface to the IPv6 stack.
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Required, since the IPv6 stack needs restart its protocol
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mechanisms on the link once authentication succeeds.
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Author:
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Mohit Talwar (mohitt) Fri Apr 20 12:05:23 2001
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--*/
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#include "pcheapol.h"
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#pragma hdrstop
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//
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// Ip6RenewInterface
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//
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// Description:
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//
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// Function called from within FSMAutheticated i.e. once authentication
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// has completed successfully. The IPv6 stack is instructed to restart
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// its protocol mechanism on the indicated interface.
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//
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// Arguments:
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// pwszInterface - Adapter name (GUID identifying the interface).
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//
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// Return values:
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// NO_ERROR on success, Error code o/w.
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//
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DWORD
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Ip6RenewInterface (
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IN WCHAR *pwszInterface
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)
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{
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HANDLE hIp6Device;
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IPV6_QUERY_INTERFACE Query;
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UINT BytesReturned;
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DWORD dwError = NO_ERROR;
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do
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{
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// We could make the hIp6Device handle a global/static variable.
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// The first successful call to CreateFileW in Ip6RenewInterface
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// would initialize it with a handle to the IPv6 Device. This would
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// be used for all subsequent DeviceIoControl requests.
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//
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// Since this function is not called in a thread safe environment,
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// we would need to perform an InterlockedCompareExchange after
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// calling CreateFileW. This is needed to ensure that no handles
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// are leaked. Also, since this service would have an open handle
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// to tcpip6.sys, we would not be able to unload that driver.
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//
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// For now, however, we keep things simple and open and close this
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// handle every time Ip6RenewInterface is called.
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hIp6Device = CreateFileW(
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WIN_IPV6_DEVICE_NAME,
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GENERIC_WRITE, // requires administrator privileges
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FILE_SHARE_READ | FILE_SHARE_WRITE,
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NULL, // security attributes
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OPEN_EXISTING,
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0, // flags & attributes
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NULL); // template file
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if (hIp6Device == INVALID_HANDLE_VALUE)
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{
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dwError = GetLastError();
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TRACE1 (ANY, "Ip6RenewInterface: CreateFileW failed with error %ld",
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dwError);
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break;
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}
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// Pretend as though the interface was reconnected. This causes
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// IPv6 to resend Router Solicitation|Advertisement, Multicast
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// Listener Discovery, and Duplicate Address Detection messages.
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Query.Index = 0;
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if ((dwError = ElGuidFromString (&(Query.Guid), pwszInterface)) != NO_ERROR)
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{
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TRACE1 (ANY, "Ip6RenewInterface: ElGuidFromString failed with error %ld",
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dwError);
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break;
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}
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if (!DeviceIoControl(
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hIp6Device,
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IOCTL_IPV6_RENEW_INTERFACE,
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&Query,
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sizeof Query,
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NULL,
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0,
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&BytesReturned,
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NULL))
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{
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dwError = GetLastError();
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TRACE1 (ANY, "Ip6RenewInterface: DeviceIoControl failed with error %ld",
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dwError);
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break;
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}
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}
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while (FALSE);
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if (hIp6Device != INVALID_HANDLE_VALUE)
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{
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CloseHandle(hIp6Device);
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}
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return dwError;
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}
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