In Windows TAP driver, refactor DHCP/ARP packet injection code to

use a DPC (deferred procedure call) to defer packet injection until
IRQL < DISPATCH_LEVEL, rather than calling NdisMEthIndicateReceive
in the context of AdapterTransmit.  This is an attempt to reduce kernel
stack usage, and prevent EXCEPTION_DOUBLE_FAULT BSODs that have been
observed on Vista.  Updated TAP driver version number to 9.6. 


git-svn-id: http://svn.openvpn.net/projects/openvpn/branches/BETA21/openvpn@4606 e7ae566f-a301-0410-adde-c780ea21d3b5

1 files changed, 20 insertions, 1 deletions

diff --git a/tap-win32/prototypes.h b/tap-win32/prototypes.h
index c342ad3..29502d6 100755
--- a/tap-win32/prototypes.h
+++ b/tap-win32/prototypes.h
@@ -171,13 +171,32 @@ VOID SetMediaStatus
     BOOLEAN state
    );
 
-VOID InjectPacket
+VOID InjectPacketDeferred
    (
     TapAdapterPointer p_Adapter,
     UCHAR *packet,
     const unsigned int len
    );
 
+VOID InjectPacketNow
+   (
+    TapAdapterPointer p_Adapter,
+    UCHAR *packet,
+    const unsigned int len
+   );
+
+// for KDEFERRED_ROUTINE and Static Driver Verifier
+//#include <wdm.h>
+//KDEFERRED_ROUTINE InjectPacketDpc;
+
+VOID InjectPacketDpc
+   (
+    KDPC *Dpc,
+    PVOID DeferredContext,
+    PVOID SystemArgument1,
+    PVOID SystemArgument2
+    );
+
 VOID CheckIfDhcpAndTunMode
    (
     TapAdapterPointer p_Adapter