const BYTE* Arp_FindTableEntry(_In_ const BYTE ip[4])
{
LOCK_STATE_EX lockState = { 0 };
const BYTE* pMac = NULL;
NdisAcquireRWLockRead(g_pArpRWLock, &lockState, 0);
pMac = _Arp_FindTableEntry_Unsafe(ip);
NdisReleaseRWLock(g_pArpRWLock, &lockState);
return pMac;
}
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;
}