static PNET_BUFFER_LIST
OvsCopySinglePacketNBL(PVOID ovsContext,
PNET_BUFFER_LIST nbl,
PNET_BUFFER nb,
UINT32 headRoom,
BOOLEAN copyNblInfo)
{
UINT32 size;
ULONG copiedSize;
POVS_SWITCH_CONTEXT context = (POVS_SWITCH_CONTEXT)ovsContext;
PNET_BUFFER_LIST newNbl;
PNET_BUFFER newNb;
NDIS_STATUS status;
POVS_BUFFER_CONTEXT srcCtx, dstCtx;
size = NET_BUFFER_DATA_LENGTH(nb);
if ((size + headRoom) <= OVS_FIX_NBL_DATA_SIZE) {
newNbl = OvsAllocateFixSizeNBL(context, size, headRoom);
} else {
newNbl = OvsAllocateVariableSizeNBL(context, size, headRoom);
}
if (newNbl == NULL) {
return NULL;
}
newNb = NET_BUFFER_LIST_FIRST_NB(newNbl);
status = NdisCopyFromNetBufferToNetBuffer(newNb, 0, size, nb, 0,
&copiedSize);
srcCtx = (POVS_BUFFER_CONTEXT)NET_BUFFER_LIST_CONTEXT_DATA_START(nbl);
if (status == NDIS_STATUS_SUCCESS) {
status = OvsCopyNBLInfo(nbl, newNbl, srcCtx, copiedSize, copyNblInfo);
}
if (status != NDIS_STATUS_SUCCESS || copiedSize != size) {
OvsCompleteNBL(context, newNbl, TRUE);
return NULL;
}
dstCtx = (POVS_BUFFER_CONTEXT)NET_BUFFER_LIST_CONTEXT_DATA_START(newNbl);
ASSERT(dstCtx && srcCtx);
ASSERT(srcCtx->magic == OVS_CTX_MAGIC && dstCtx->magic == OVS_CTX_MAGIC);
dstCtx->flags |= srcCtx->flags & (OVS_BUFFER_RECV_BUFFER |
OVS_BUFFER_SEND_BUFFER);
#ifdef DBG
OvsDumpNetBufferList(newNbl);
OvsDumpForwardingDetails(newNbl);
#endif
OVS_LOG_LOUD("Copy single nb to new NBL: %p", newNbl);
return newNbl;
}
static NTSTATUS
OvsTunnelAnalyzePacket(OVS_TUNNEL_PENDED_PACKET *packet)
{
NTSTATUS status = STATUS_SUCCESS;
UINT32 packetLength = 0;
ULONG bytesCopied = 0;
NET_BUFFER_LIST *copiedNBL = NULL;
NET_BUFFER *netBuffer;
NDIS_STATUS ndisStatus;
/*
* For inbound net buffer list, we can assume it contains only one
* net buffer (unless it was an re-assembeled fragments). in both cases
* the first net buffer should include all headers, we assert if the retreat fails
*/
netBuffer = NET_BUFFER_LIST_FIRST_NB(packet->netBufferList);
/* Drop the packet from the host stack */
packet->classifyOut->actionType = FWP_ACTION_BLOCK;
packet->classifyOut->rights &= ~FWPS_RIGHT_ACTION_WRITE;
/* Adjust the net buffer list offset to the start of the IP header */
ndisStatus = NdisRetreatNetBufferDataStart(netBuffer,
packet->ipHeaderSize +
packet->transportHeaderSize,
0, NULL);
ASSERT(ndisStatus == NDIS_STATUS_SUCCESS);
/* Single NBL element for WFP */
ASSERT(packet->netBufferList->Next == NULL);
/* Note that the copy will inherit the original net buffer list's offset */
packetLength = NET_BUFFER_DATA_LENGTH(netBuffer);
copiedNBL = OvsAllocateVariableSizeNBL(gOvsSwitchContext, packetLength,
OVS_DEFAULT_HEADROOM_SIZE);
if (copiedNBL == NULL) {
goto analyzeDone;
}
status = NdisCopyFromNetBufferToNetBuffer(NET_BUFFER_LIST_FIRST_NB(copiedNBL),
0, packetLength,
netBuffer, 0, &bytesCopied);
if (status != NDIS_STATUS_SUCCESS || packetLength != bytesCopied) {
goto analyzeFreeNBL;
}
status = OvsInjectPacketThroughActions(copiedNBL,
packet);
goto analyzeDone;
/* Undo the adjustment on the original net buffer list */
analyzeFreeNBL:
OvsCompleteNBL(gOvsSwitchContext, copiedNBL, TRUE);
analyzeDone:
NdisAdvanceNetBufferDataStart(netBuffer,
packet->transportHeaderSize + packet->ipHeaderSize,
FALSE,
NULL);
return status;
}