Commit b73c1849 authored by Andrew Baumann's avatar Andrew Baumann Committed by Jason Wang
Browse files

tap-win32: disable broken async write path 



The code under the TUN_ASYNCHRONOUS_WRITES path makes two incorrect
assumptions about the behaviour of the WriteFile API for overlapped
file handles. First, WriteFile does not update the
lpNumberOfBytesWritten parameter when the write completes
asynchronously (the number of bytes written is known only when the
operation completes). Second, the buffer shouldn't be touched (or
freed) until the operation completes. This led to at least one bug
where tap_win32_write returned zero bytes written, which in turn
caused further writes ("receives") to be disabled for that device.

This change disables the asynchronous write path, while keeping most
of the code around in case someone sees value in resurrecting it. It
also adds some conditional debug output, similar to the read path.

Signed-off-by: default avatarAndrew Baumann <Andrew.Baumann@microsoft.com>
Acked-by: default avatarStefan Weil <sw@weilnetz.de>
Signed-off-by: default avatarJason Wang <jasowang@redhat.com>
parent ee0428e3

net/tap-win32.c

+36 −10
Original line number Diff line number Diff line
@@ -77,7 +77,12 @@ 


//#define DEBUG_TAP_WIN32



#define TUN_ASYNCHRONOUS_WRITES 1

/* FIXME: The asynch write path appears to be broken at

 * present. WriteFile() ignores the lpNumberOfBytesWritten parameter

 * for overlapped writes, with the result we return zero bytes sent,

 * and after handling a single packet, receive is disabled for this

 * interface. */

/* #define TUN_ASYNCHRONOUS_WRITES 1 */



#define TUN_BUFFER_SIZE 1560

#define TUN_MAX_BUFFER_COUNT 32
@@ -461,26 +466,47 @@ static int tap_win32_write(tap_win32_overlapped_t *overlapped, 
    BOOL result;

    DWORD error;



#ifdef TUN_ASYNCHRONOUS_WRITES

    result = GetOverlappedResult( overlapped->handle, &overlapped->write_overlapped,

                                  &write_size, FALSE);



    if (!result && GetLastError() == ERROR_IO_INCOMPLETE)

        WaitForSingleObject(overlapped->write_event, INFINITE);

#endif



    result = WriteFile(overlapped->handle, buffer, size,

                       &write_size, &overlapped->write_overlapped);



#ifdef TUN_ASYNCHRONOUS_WRITES

    /* FIXME: we can't sensibly set write_size here, without waiting

     * for the IO to complete! Moreover, we can't return zero,

     * because that will disable receive on this interface, and we

     * also can't assume it will succeed and return the full size,

     * because that will result in the buffer being reclaimed while

     * the IO is in progress. */

#error Async writes are broken. Please disable TUN_ASYNCHRONOUS_WRITES.

#else /* !TUN_ASYNCHRONOUS_WRITES */

    if (!result) {

        switch (error = GetLastError())

        {

        case ERROR_IO_PENDING:

#ifndef TUN_ASYNCHRONOUS_WRITES

            WaitForSingleObject(overlapped->write_event, INFINITE);

#endif

            break;

        default:

            return -1;

        error = GetLastError();

        if (error == ERROR_IO_PENDING) {

            result = GetOverlappedResult(overlapped->handle,

                                         &overlapped->write_overlapped,

                                         &write_size, TRUE);

        }

    }

#endif



    if (!result) {

#ifdef DEBUG_TAP_WIN32

        LPTSTR msgbuf;

        error = GetLastError();

        FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM,

                      NULL, error, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),

                      &msgbuf, 0, NULL);

        fprintf(stderr, "Tap-Win32: Error WriteFile %d - %s\n", error, msgbuf);

        LocalFree(msgbuf);

#endif

        return 0;

    }



    return write_size;