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;
}
/*
* --------------------------------------------------------------------------
* OvsFullCopyToMultipleNBLs --
*
* Copy NBL to multiple NBLs, each NB will have its own NBL
* --------------------------------------------------------------------------
*/
PNET_BUFFER_LIST
OvsFullCopyToMultipleNBLs(PVOID ovsContext,
PNET_BUFFER_LIST nbl,
UINT32 headRoom,
BOOLEAN copyNblInfo)
{
POVS_SWITCH_CONTEXT context = (POVS_SWITCH_CONTEXT)ovsContext;
PNET_BUFFER_LIST firstNbl, currNbl, newNbl;
PNET_BUFFER nb;
POVS_BUFFER_CONTEXT srcCtx;
srcCtx = (POVS_BUFFER_CONTEXT)NET_BUFFER_LIST_CONTEXT_DATA_START(nbl);
if (srcCtx == NULL || srcCtx->magic != OVS_CTX_MAGIC) {
OVS_LOG_INFO("src nbl must have ctx initialized");
ASSERT(srcCtx && srcCtx->magic == OVS_CTX_MAGIC);
return NULL;
}
nb = NET_BUFFER_LIST_FIRST_NB(nbl);
newNbl = OvsCopySinglePacketNBL(context, nbl, nb, headRoom, copyNblInfo);
if (newNbl == NULL || NET_BUFFER_NEXT_NB(nb) == NULL) {
return newNbl;
} else {
firstNbl = newNbl;
currNbl = newNbl;
}
while (nb) {
newNbl = OvsCopySinglePacketNBL(context, nbl, nb, headRoom,
copyNblInfo);
if (newNbl == NULL) {
goto copymultiple_error;
}
NET_BUFFER_LIST_NEXT_NBL(currNbl) = newNbl;
currNbl = newNbl;
nb = NET_BUFFER_NEXT_NB(nb);
}
return firstNbl;
copymultiple_error:
while (firstNbl) {
currNbl = firstNbl;
firstNbl = NET_BUFFER_LIST_NEXT_NBL(firstNbl);
NET_BUFFER_LIST_NEXT_NBL(currNbl) = NULL;
OvsCompleteNBL(context, currNbl, TRUE);
}
return NULL;
}
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;
}
static NTSTATUS
OvsInjectPacketThroughActions(PNET_BUFFER_LIST pNbl,
OVS_TUNNEL_PENDED_PACKET *packet)
{
NTSTATUS status = STATUS_SUCCESS;
OvsIPv4TunnelKey tunnelKey;
NET_BUFFER *pNb;
ULONG sendCompleteFlags = 0;
BOOLEAN dispatch;
PNDIS_SWITCH_FORWARDING_DETAIL_NET_BUFFER_LIST_INFO fwdDetail;
LOCK_STATE_EX lockState, dpLockState;
LIST_ENTRY missedPackets;
OvsCompletionList completionList;
KIRQL irql;
ULONG SendFlags = NDIS_SEND_FLAGS_SWITCH_DESTINATION_GROUP;
OVS_DATAPATH *datapath = NULL;
ASSERT(gOvsSwitchContext);
datapath = &gOvsSwitchContext->datapath;
/* Fill the tunnel key */
status = OvsSlowPathDecapVxlan(pNbl, &tunnelKey);
if(!NT_SUCCESS(status)) {
goto dropit;
}
pNb = NET_BUFFER_LIST_FIRST_NB(pNbl);
NdisAdvanceNetBufferDataStart(pNb,
packet->transportHeaderSize + packet->ipHeaderSize +
sizeof(VXLANHdr),
FALSE,
NULL);
/* Most likely (always) dispatch irql */
irql = KeGetCurrentIrql();
/* dispatch is used for datapath lock as well */
dispatch = (irql == DISPATCH_LEVEL) ? NDIS_RWL_AT_DISPATCH_LEVEL : 0;
if (dispatch) {
sendCompleteFlags |= NDIS_SEND_COMPLETE_FLAGS_DISPATCH_LEVEL;
}
InitializeListHead(&missedPackets);
OvsInitCompletionList(&completionList, gOvsSwitchContext,
sendCompleteFlags);
{
POVS_VPORT_ENTRY vport;
UINT32 portNo;
OVS_PACKET_HDR_INFO layers;
OvsFlowKey key;
UINT64 hash;
PNET_BUFFER curNb;
OvsFlow *flow;
fwdDetail = NET_BUFFER_LIST_SWITCH_FORWARDING_DETAIL(pNbl);
/*
* XXX WFP packets contain a single NBL structure.
* Reassembeled packet "may" have multiple NBs, however, a simple test shows
* that the packet still has a single NB (after reassemble)
* We still need to check if the Ethernet header of the innet packet is in a single MD
*/
curNb = NET_BUFFER_LIST_FIRST_NB(pNbl);
ASSERT(curNb->Next == NULL);
NdisAcquireRWLockRead(gOvsSwitchContext->dispatchLock, &lockState, dispatch);
/* Lock the flowtable for the duration of accessing the flow */
OvsAcquireDatapathRead(datapath, &dpLockState, NDIS_RWL_AT_DISPATCH_LEVEL);
SendFlags |= NDIS_SEND_FLAGS_DISPATCH_LEVEL;
vport = OvsFindTunnelVportByDstPort(gOvsSwitchContext,
htons(tunnelKey.dst_port),
OVS_VPORT_TYPE_VXLAN);
if (vport == NULL){
status = STATUS_UNSUCCESSFUL;
goto unlockAndDrop;
}
ASSERT(vport->ovsType == OVS_VPORT_TYPE_VXLAN);
portNo = vport->portNo;
status = OvsExtractFlow(pNbl, portNo, &key, &layers, &tunnelKey);
if (status != NDIS_STATUS_SUCCESS) {
goto unlockAndDrop;
}
flow = OvsLookupFlow(datapath, &key, &hash, FALSE);
if (flow) {
OvsFlowUsed(flow, pNbl, &layers);
datapath->hits++;
OvsActionsExecute(gOvsSwitchContext, &completionList, pNbl,
portNo, SendFlags, &key, &hash, &layers,
flow->actions, flow->actionsLen);
OvsReleaseDatapath(datapath, &dpLockState);
} else {
POVS_PACKET_QUEUE_ELEM elem;
datapath->misses++;
elem = OvsCreateQueueNlPacket(NULL, 0, OVS_PACKET_CMD_MISS,
vport, &key, pNbl, curNb,
TRUE, &layers);
if (elem) {
/* Complete the packet since it was copied to user buffer. */
InsertTailList(&missedPackets, &elem->link);
OvsQueuePackets(&missedPackets, 1);
} else {
status = STATUS_INSUFFICIENT_RESOURCES;
}
goto unlockAndDrop;
}
NdisReleaseRWLock(gOvsSwitchContext->dispatchLock, &lockState);
}
return status;
unlockAndDrop:
OvsReleaseDatapath(datapath, &dpLockState);
NdisReleaseRWLock(gOvsSwitchContext->dispatchLock, &lockState);
dropit:
pNbl = OvsCompleteNBL(gOvsSwitchContext, pNbl, TRUE);
ASSERT(pNbl == NULL);
return status;
}
/*
* --------------------------------------------------------------------------
* OvsCompleteNBL --
*
* This function tries to free the NBL allocated by OVS buffer
* management module. If it trigger the completion of the parent
* NBL, it will recursively call itself. If it trigger the completion
* of external NBL, it will be returned to the caller. The caller
* is responsible to call API to return to upper layer.
* --------------------------------------------------------------------------
*/
PNET_BUFFER_LIST
OvsCompleteNBL(POVS_SWITCH_CONTEXT context,
PNET_BUFFER_LIST nbl,
BOOLEAN updateRef)
{
POVS_BUFFER_CONTEXT ctx;
UINT16 flags;
PNET_BUFFER_LIST parent;
NDIS_STATUS status;
NDIS_HANDLE poolHandle;
LONG value;
POVS_NBL_POOL ovsPool = &context->ovsPool;
PNET_BUFFER nb;
ctx = (POVS_BUFFER_CONTEXT)NET_BUFFER_LIST_CONTEXT_DATA_START(nbl);
ASSERT(ctx && ctx->magic == OVS_CTX_MAGIC);
OVS_LOG_TRACE("Enter: nbl: %p, ctx: %p, refCount: %d, updateRef:%d",
nbl, ctx, ctx->refCount, updateRef);
if (updateRef) {
value = InterlockedDecrement((LONG volatile *)&ctx->refCount);
if (value != 0) {
return NULL;
}
} else {
/*
* This is a special case, the refCount must be zero
*/
ASSERT(ctx->refCount == 0);
}
nb = NET_BUFFER_LIST_FIRST_NB(nbl);
flags = ctx->flags;
if (!(flags & OVS_BUFFER_FRAGMENT) &&
NET_BUFFER_DATA_LENGTH(nb) != ctx->origDataLength) {
UINT32 diff;
if (NET_BUFFER_DATA_LENGTH(nb) < ctx->origDataLength) {
diff = ctx->origDataLength -NET_BUFFER_DATA_LENGTH(nb);
status = NdisRetreatNetBufferListDataStart(nbl, diff, 0,
NULL, NULL);
ASSERT(status == NDIS_STATUS_SUCCESS);
} else {
diff = NET_BUFFER_DATA_LENGTH(nb) - ctx->origDataLength;
NdisAdvanceNetBufferListDataStart(nbl, diff, TRUE, NULL);
}
}
if (ctx->flags & OVS_BUFFER_PRIVATE_CONTEXT) {
NdisFreeNetBufferListContext(nbl, sizeof (OVS_BUFFER_CONTEXT));
}
if (flags & OVS_BUFFER_NEED_COMPLETE) {
/*
* return to caller for completion
*/
#ifdef DBG
InterlockedDecrement((LONG volatile *)&ovsPool->sysNBLCount);
#endif
return nbl;
}
if (flags & OVS_BUFFER_PRIVATE_FORWARD_CONTEXT) {
context->NdisSwitchHandlers.
FreeNetBufferListForwardingContext(ovsPool->ndisContext, nbl);
}
if (flags & (OVS_BUFFER_PRIVATE_MDL | OVS_BUFFER_PRIVATE_DATA)) {
PNET_BUFFER nb = NET_BUFFER_LIST_FIRST_NB(nbl);
while (nb) {
PMDL mdl = NET_BUFFER_FIRST_MDL(nb);
NET_BUFFER_FIRST_MDL(nb) = NULL;
ASSERT(mdl->Next == NULL);
OvsFreeMDLAndData(mdl);
nb = NET_BUFFER_NEXT_NB(nb);
}
}
if (flags & OVS_BUFFER_PRIVATE_NET_BUFFER) {
PNET_BUFFER nb, nextNb;
nb = NET_BUFFER_LIST_FIRST_NB(nbl);
while (nb) {
nextNb = NET_BUFFER_NEXT_NB(nb);
NdisFreeNetBuffer(nb);
#ifdef DBG
InterlockedDecrement((LONG volatile *)&ovsPool->nbCount);
#endif
nb = nextNb;
}
NET_BUFFER_LIST_FIRST_NB(nbl) = NULL;
}
parent = nbl->ParentNetBufferList;
poolHandle = NdisGetPoolFromNetBufferList(nbl);
if (flags & OVS_BUFFER_FROM_FIX_SIZE_POOL) {
ASSERT(poolHandle == ovsPool->fixSizePool);
#ifdef DBG
InterlockedDecrement((LONG volatile *)&ovsPool->fixNBLCount);
#endif
NdisFreeNetBufferList(nbl);
} else if (flags & OVS_BUFFER_FROM_ZERO_SIZE_POOL) {
ASSERT(poolHandle == ovsPool->zeroSizePool);
#ifdef DBG
InterlockedDecrement((LONG volatile *)&ovsPool->zeroNBLCount);
#endif
NdisFreeNetBufferList(nbl);
} else if (flags & OVS_BUFFER_FROM_NBL_ONLY_POOL) {
ASSERT(poolHandle == ovsPool->nblOnlyPool);
#ifdef DBG
InterlockedDecrement((LONG volatile *)&ovsPool->nblOnlyCount);
#endif
NdisFreeCloneNetBufferList(nbl, 0);
} else if (flags & OVS_BUFFER_FRAGMENT) {
OVS_LOG_TRACE("Free fragment %p parent %p", nbl, parent);
#ifdef DBG
InterlockedDecrement((LONG volatile *)&ovsPool->fragNBLCount);
#endif
NdisFreeFragmentNetBufferList(nbl, ctx->dataOffsetDelta, 0);
}
if (parent != NULL) {
ctx = (POVS_BUFFER_CONTEXT)NET_BUFFER_LIST_CONTEXT_DATA_START(parent);
ASSERT(ctx && ctx->magic == OVS_CTX_MAGIC);
value = InterlockedDecrement((LONG volatile *)&ctx->refCount);
if (value == 0) {
return OvsCompleteNBL(context, parent, FALSE);
}
}
return NULL;
}
/*
*----------------------------------------------------------------------------
* OvsDoEncapVxlan
* Encapsulates the packet.
*----------------------------------------------------------------------------
*/
static __inline NDIS_STATUS
OvsDoEncapVxlan(PNET_BUFFER_LIST curNbl,
OvsIPv4TunnelKey *tunKey,
POVS_FWD_INFO fwdInfo,
POVS_PACKET_HDR_INFO layers,
POVS_SWITCH_CONTEXT switchContext,
PNET_BUFFER_LIST *newNbl)
{
NDIS_STATUS status;
PNET_BUFFER curNb;
PMDL curMdl;
PUINT8 bufferStart;
EthHdr *ethHdr;
IPHdr *ipHdr;
UDPHdr *udpHdr;
VXLANHdr *vxlanHdr;
UINT32 headRoom = OvsGetVxlanTunHdrSize();
UINT32 packetLength;
/*
* XXX: the assumption currently is that the NBL is owned by OVS, and
* headroom has already been allocated as part of allocating the NBL and
* MDL.
*/
curNb = NET_BUFFER_LIST_FIRST_NB(curNbl);
packetLength = NET_BUFFER_DATA_LENGTH(curNb);
if (layers->isTcp) {
NDIS_TCP_LARGE_SEND_OFFLOAD_NET_BUFFER_LIST_INFO tsoInfo;
tsoInfo.Value = NET_BUFFER_LIST_INFO(curNbl,
TcpLargeSendNetBufferListInfo);
OVS_LOG_TRACE("MSS %u packet len %u", tsoInfo.LsoV1Transmit.MSS, packetLength);
if (tsoInfo.LsoV1Transmit.MSS) {
OVS_LOG_TRACE("l4Offset %d", layers->l4Offset);
*newNbl = OvsTcpSegmentNBL(switchContext, curNbl, layers,
tsoInfo.LsoV1Transmit.MSS, headRoom);
if (*newNbl == NULL) {
OVS_LOG_ERROR("Unable to segment NBL");
return NDIS_STATUS_FAILURE;
}
}
}
/* If we didn't split the packet above, make a copy now */
if (*newNbl == NULL) {
*newNbl = OvsPartialCopyNBL(switchContext, curNbl, 0, headRoom,
FALSE /*NBL info*/);
if (*newNbl == NULL) {
OVS_LOG_ERROR("Unable to copy NBL");
return NDIS_STATUS_FAILURE;
}
}
curNbl = *newNbl;
for (curNb = NET_BUFFER_LIST_FIRST_NB(curNbl); curNb != NULL;
curNb = curNb->Next) {
status = NdisRetreatNetBufferDataStart(curNb, headRoom, 0, NULL);
if (status != NDIS_STATUS_SUCCESS) {
goto ret_error;
}
curMdl = NET_BUFFER_CURRENT_MDL(curNb);
bufferStart = (PUINT8)MmGetSystemAddressForMdlSafe(curMdl, LowPagePriority);
if (!bufferStart) {
status = NDIS_STATUS_RESOURCES;
goto ret_error;
}
bufferStart += NET_BUFFER_CURRENT_MDL_OFFSET(curNb);
if (NET_BUFFER_NEXT_NB(curNb)) {
OVS_LOG_TRACE("nb length %u next %u", NET_BUFFER_DATA_LENGTH(curNb),
NET_BUFFER_DATA_LENGTH(curNb->Next));
}
/* L2 header */
ethHdr = (EthHdr *)bufferStart;
NdisMoveMemory(ethHdr->Destination, fwdInfo->dstMacAddr,
sizeof ethHdr->Destination + sizeof ethHdr->Source);
ASSERT(((PCHAR)&fwdInfo->dstMacAddr + sizeof fwdInfo->dstMacAddr) ==
(PCHAR)&fwdInfo->srcMacAddr);
ethHdr->Type = htons(ETH_TYPE_IPV4);
// XXX: question: there are fields in the OvsIPv4TunnelKey for ttl and such,
// should we use those values instead? or will they end up being
// uninitialized;
/* IP header */
ipHdr = (IPHdr *)((PCHAR)ethHdr + sizeof *ethHdr);
ipHdr->ihl = sizeof *ipHdr / 4;
ipHdr->version = IPV4;
ipHdr->tos = 0;
ipHdr->tot_len = htons(NET_BUFFER_DATA_LENGTH(curNb) - sizeof *ethHdr);
ipHdr->id = 0;
ipHdr->frag_off = IP_DF_NBO;
ipHdr->ttl = tunKey->ttl ? tunKey->ttl : VXLAN_DEFAULT_TTL;
ipHdr->protocol = IPPROTO_UDP;
ASSERT(tunKey->dst == fwdInfo->dstIpAddr);
ASSERT(tunKey->src == fwdInfo->srcIpAddr || tunKey->src == 0);
ipHdr->saddr = fwdInfo->srcIpAddr;
ipHdr->daddr = fwdInfo->dstIpAddr;
ipHdr->check = 0;
ipHdr->check = IPChecksum((UINT8 *)ipHdr, sizeof *ipHdr, 0);
/* UDP header */
udpHdr = (UDPHdr *)((PCHAR)ipHdr + sizeof *ipHdr);
udpHdr->source = htons(tunKey->flow_hash | 32768);
udpHdr->dest = VXLAN_UDP_PORT_NBO;
udpHdr->len = htons(NET_BUFFER_DATA_LENGTH(curNb) - headRoom +
sizeof *udpHdr + sizeof *vxlanHdr);
udpHdr->check = 0;
/* VXLAN header */
vxlanHdr = (VXLANHdr *)((PCHAR)udpHdr + sizeof *udpHdr);
vxlanHdr->flags1 = 0;
vxlanHdr->locallyReplicate = 0;
vxlanHdr->flags2 = 0;
vxlanHdr->reserved1 = 0;
if (tunKey->flags | OVS_TNL_F_KEY) {
vxlanHdr->vxlanID = VXLAN_TUNNELID_TO_VNI(tunKey->tunnelId);
vxlanHdr->instanceID = 1;
}
vxlanHdr->reserved2 = 0;
}
return STATUS_SUCCESS;
ret_error:
OvsCompleteNBL(switchContext, *newNbl, TRUE);
*newNbl = NULL;
return status;
}
/*
*----------------------------------------------------------------------------
* OvsDoDecapVxlan
* Decapsulates to tunnel header in 'curNbl' and puts into 'tunKey'.
*----------------------------------------------------------------------------
*/
NDIS_STATUS
OvsDoDecapVxlan(POVS_SWITCH_CONTEXT switchContext,
PNET_BUFFER_LIST curNbl,
OvsIPv4TunnelKey *tunKey,
PNET_BUFFER_LIST *newNbl)
{
PNET_BUFFER curNb;
PMDL curMdl;
EthHdr *ethHdr;
IPHdr *ipHdr;
UDPHdr *udpHdr;
VXLANHdr *vxlanHdr;
UINT32 tunnelSize = 0, packetLength = 0;
PUINT8 bufferStart;
NDIS_STATUS status;
/* Check the the length of the UDP payload */
curNb = NET_BUFFER_LIST_FIRST_NB(curNbl);
packetLength = NET_BUFFER_DATA_LENGTH(curNb);
tunnelSize = OvsGetVxlanTunHdrSize();
if (packetLength <= tunnelSize) {
return NDIS_STATUS_INVALID_LENGTH;
}
/*
* Create a copy of the NBL so that we have all the headers in one MDL.
*/
*newNbl = OvsPartialCopyNBL(switchContext, curNbl,
tunnelSize + OVS_DEFAULT_COPY_SIZE, 0,
TRUE /*copy NBL info */);
if (*newNbl == NULL) {
return NDIS_STATUS_RESOURCES;
}
/* XXX: Handle VLAN header. */
curNbl = *newNbl;
curNb = NET_BUFFER_LIST_FIRST_NB(curNbl);
curMdl = NET_BUFFER_CURRENT_MDL(curNb);
bufferStart = (PUINT8)MmGetSystemAddressForMdlSafe(curMdl, LowPagePriority) +
NET_BUFFER_CURRENT_MDL_OFFSET(curNb);
if (!bufferStart) {
status = NDIS_STATUS_RESOURCES;
goto dropNbl;
}
ethHdr = (EthHdr *)bufferStart;
/* XXX: Handle IP options. */
ipHdr = (IPHdr *)((PCHAR)ethHdr + sizeof *ethHdr);
tunKey->src = ipHdr->saddr;
tunKey->dst = ipHdr->daddr;
tunKey->tos = ipHdr->tos;
tunKey->ttl = ipHdr->ttl;
tunKey->pad = 0;
udpHdr = (UDPHdr *)((PCHAR)ipHdr + sizeof *ipHdr);
/* Validate if NIC has indicated checksum failure. */
status = OvsValidateUDPChecksum(curNbl, udpHdr->check == 0);
if (status != NDIS_STATUS_SUCCESS) {
goto dropNbl;
}
/* Calculate and verify UDP checksum if NIC didn't do it. */
if (udpHdr->check != 0) {
status = OvsCalculateUDPChecksum(curNbl, curNb, ipHdr, udpHdr, packetLength);
if (status != NDIS_STATUS_SUCCESS) {
goto dropNbl;
}
}
vxlanHdr = (VXLANHdr *)((PCHAR)udpHdr + sizeof *udpHdr);
if (vxlanHdr->instanceID) {
tunKey->flags = OVS_TNL_F_KEY;
tunKey->tunnelId = VXLAN_VNI_TO_TUNNELID(vxlanHdr->vxlanID);
} else {
tunKey->flags = 0;
tunKey->tunnelId = 0;
}
/* Clear out the receive flag for the inner packet. */
NET_BUFFER_LIST_INFO(curNbl, TcpIpChecksumNetBufferListInfo) = 0;
NdisAdvanceNetBufferDataStart(curNb, tunnelSize, FALSE, NULL);
return NDIS_STATUS_SUCCESS;
dropNbl:
OvsCompleteNBL(switchContext, *newNbl, TRUE);
*newNbl = NULL;
return status;
}