int
VMCIDatagram_InvokeGuestHandler(VMCIDatagram *dg) // IN
{
#if defined(VMKERNEL)
VMCI_WARNING((LGPFX"Cannot dispatch within guest in VMKERNEL.\n"));
return VMCI_ERROR_DST_UNREACHABLE;
#else // VMKERNEL
int retval;
VMCIResource *resource;
DatagramEntry *dstEntry;
ASSERT(dg);
resource = VMCIResource_Get(dg->dst, VMCI_RESOURCE_TYPE_DATAGRAM);
if (NULL == resource) {
VMCI_DEBUG_LOG(4, (LGPFX"destination (handle=0x%x:0x%x) doesn't exist.\n",
dg->dst.context, dg->dst.resource));
return VMCI_ERROR_NO_HANDLE;
}
dstEntry = RESOURCE_CONTAINER(resource, DatagramEntry, resource);
if (dstEntry->runDelayed) {
VMCIDelayedDatagramInfo *dgInfo;
dgInfo = VMCI_AllocKernelMem(sizeof *dgInfo + (size_t)dg->payloadSize,
(VMCI_MEMORY_ATOMIC | VMCI_MEMORY_NONPAGED));
if (NULL == dgInfo) {
VMCIResource_Release(resource);
retval = VMCI_ERROR_NO_MEM;
goto exit;
}
dgInfo->inDGHostQueue = FALSE;
dgInfo->entry = dstEntry;
memcpy(&dgInfo->msg, dg, VMCI_DG_SIZE(dg));
retval = VMCI_ScheduleDelayedWork(VMCIDatagramDelayedDispatchCB, dgInfo);
if (retval < VMCI_SUCCESS) {
VMCI_WARNING((LGPFX"Failed to schedule delayed work for datagram "
"(result=%d).\n", retval));
VMCI_FreeKernelMem(dgInfo, sizeof *dgInfo + (size_t)dg->payloadSize);
VMCIResource_Release(resource);
dgInfo = NULL;
goto exit;
}
} else {
dstEntry->recvCB(dstEntry->clientData, dg);
VMCIResource_Release(resource);
retval = VMCI_SUCCESS;
}
exit:
return retval;
#endif // VMKERNEL
}
static int
VMCIDatagramGetPrivFlagsInt(VMCIId contextID, // IN
VMCIHandle handle, // IN
VMCIPrivilegeFlags *privFlags) // OUT
{
ASSERT(privFlags);
ASSERT(contextID != VMCI_INVALID_ID);
if (contextID == VMCI_HOST_CONTEXT_ID) {
DatagramEntry *srcEntry;
VMCIResource *resource;
resource = VMCIResource_Get(handle, VMCI_RESOURCE_TYPE_DATAGRAM);
if (resource == NULL) {
return VMCI_ERROR_INVALID_ARGS;
}
srcEntry = RESOURCE_CONTAINER(resource, DatagramEntry, resource);
*privFlags = srcEntry->privFlags;
VMCIResource_Release(resource);
} else if (contextID == VMCI_HYPERVISOR_CONTEXT_ID) {
*privFlags = VMCI_MAX_PRIVILEGE_FLAGS;
} else {
*privFlags = vmci_context_get_priv_flags(contextID);
}
return VMCI_SUCCESS;
}
static int
DatagramReleaseCB(void *clientData)
{
DatagramEntry *entry = (DatagramEntry *)clientData;
ASSERT(entry);
VMCIResource_Release(&entry->resource);
return 0;
}
static void
VMCIDatagramDelayedDispatchCB(void *data) // IN
{
Bool inDGHostQueue;
VMCIDelayedDatagramInfo *dgInfo = (VMCIDelayedDatagramInfo *)data;
ASSERT(data);
dgInfo->entry->recvCB(dgInfo->entry->clientData, &dgInfo->msg);
VMCIResource_Release(&dgInfo->entry->resource);
inDGHostQueue = dgInfo->inDGHostQueue;
VMCI_FreeKernelMem(dgInfo, sizeof *dgInfo + (size_t)dgInfo->msg.payloadSize);
if (inDGHostQueue) {
Atomic_Dec(&delayedDGHostQueueSize);
}
}
static int
VMCIDatagramDispatchAsGuest(VMCIDatagram *dg)
{
#if defined(VMKERNEL)
VMCI_WARNING((LGPFX"Cannot send down to host from VMKERNEL.\n"));
return VMCI_ERROR_DST_UNREACHABLE;
#else // VMKERNEL
int retval;
VMCIResource *resource;
resource = VMCIResource_Get(dg->src, VMCI_RESOURCE_TYPE_DATAGRAM);
if (NULL == resource) {
return VMCI_ERROR_NO_HANDLE;
}
retval = VMCI_SendDatagram(dg);
VMCIResource_Release(resource);
return retval;
#endif // VMKERNEL
}
int
VMCIDs_Register(const char* name, // IN:
VMCIHandle handle, // IN:
VMCIId contextID) // IN:
{
int errcode;
VMCILockFlags flags;
VMCI_GrabLock(&lock, &flags);
errcode = DsListInsert(dsAPI.registry, name, handle, contextID);
VMCI_ReleaseLock(&lock, flags);
if (errcode == VMCI_SUCCESS) {
VMCIResource *resource = VMCIResource_Get(handle, VMCI_RESOURCE_TYPE_ANY);
if (resource) {
VMCIResource_IncDsRegCount(resource);
VMCIResource_Release(resource);
}
}
return errcode;
}
int
VMCIDs_Unregister(const char *name, // IN:
VMCIId contextID) // IN:
{
int errcode;
VMCILockFlags flags;
VMCIHandle handle = VMCI_INVALID_HANDLE;
VMCI_GrabLock(&lock, &flags);
errcode = DsListRemove(dsAPI.registry, name, &handle, contextID);
VMCI_ReleaseLock(&lock, flags);
if (errcode == VMCI_SUCCESS) {
VMCIResource *resource;
ASSERT(!VMCI_HANDLE_EQUAL(handle, VMCI_INVALID_HANDLE));
resource = VMCIResource_Get(handle, VMCI_RESOURCE_TYPE_ANY);
if (resource) {
VMCIResource_DecDsRegCount(resource);
VMCIResource_Release(resource);
}
}
return errcode;
}
static int
VMCIDatagramDispatchAsHost(VMCIId contextID, // IN:
VMCIDatagram *dg) // IN:
{
int retval;
size_t dgSize;
VMCIPrivilegeFlags srcPrivFlags;
ASSERT(dg);
ASSERT(VMCI_HostPersonalityActive());
dgSize = VMCI_DG_SIZE(dg);
if (contextID == VMCI_HOST_CONTEXT_ID &&
dg->dst.context == VMCI_HYPERVISOR_CONTEXT_ID) {
VMCI_DEBUG_LOG(4, (LGPFX"Host cannot talk to hypervisor\n"));
return VMCI_ERROR_DST_UNREACHABLE;
}
ASSERT(dg->dst.context != VMCI_HYPERVISOR_CONTEXT_ID);
/* Chatty. */
// VMCI_DEBUG_LOG(10, (LGPFX"Sending from (handle=0x%x:0x%x) to "
// "(handle=0x%x:0x%x) (size=%u bytes).\n",
// dg->src.context, dg->src.resource,
// dg->dst.context, dg->dst.resource, (uint32)dgSize));
/*
* Check that source handle matches sending context.
*/
if (dg->src.context != contextID) {
VMCI_DEBUG_LOG(4, (LGPFX"Sender context (ID=0x%x) is not owner of src "
"datagram entry (handle=0x%x:0x%x).\n",
contextID, dg->src.context, dg->src.resource));
return VMCI_ERROR_NO_ACCESS;
}
/*
* Get hold of privileges of sending endpoint.
*/
retval = VMCIDatagramGetPrivFlagsInt(contextID, dg->src, &srcPrivFlags);
if (retval != VMCI_SUCCESS) {
VMCI_WARNING((LGPFX"Couldn't get privileges (handle=0x%x:0x%x).\n",
dg->src.context, dg->src.resource));
return retval;
}
/* Determine if we should route to host or guest destination. */
if (dg->dst.context == VMCI_HOST_CONTEXT_ID) {
/* Route to host datagram entry. */
DatagramEntry *dstEntry;
VMCIResource *resource;
if (dg->src.context == VMCI_HYPERVISOR_CONTEXT_ID &&
dg->dst.resource == VMCI_EVENT_HANDLER) {
return VMCIEvent_Dispatch(dg);
}
resource = VMCIResource_Get(dg->dst, VMCI_RESOURCE_TYPE_DATAGRAM);
if (resource == NULL) {
VMCI_DEBUG_LOG(4, (LGPFX"Sending to invalid destination "
"(handle=0x%x:0x%x).\n",
dg->dst.context, dg->dst.resource));
return VMCI_ERROR_INVALID_RESOURCE;
}
dstEntry = RESOURCE_CONTAINER(resource, DatagramEntry, resource);
if (VMCIDenyInteraction(srcPrivFlags, dstEntry->privFlags)) {
VMCIResource_Release(resource);
return VMCI_ERROR_NO_ACCESS;
}
ASSERT(dstEntry->recvCB);
/*
* If a VMCI datagram destined for the host is also sent by the
* host, we always run it delayed. This ensures that no locks
* are held when the datagram callback runs.
*/
if (dstEntry->runDelayed ||
(dg->src.context == VMCI_HOST_CONTEXT_ID &&
VMCI_CanScheduleDelayedWork())) {
VMCIDelayedDatagramInfo *dgInfo;
if (Atomic_FetchAndAdd(&delayedDGHostQueueSize, 1) ==
VMCI_MAX_DELAYED_DG_HOST_QUEUE_SIZE) {
Atomic_Dec(&delayedDGHostQueueSize);
VMCIResource_Release(resource);
return VMCI_ERROR_NO_MEM;
}
dgInfo = VMCI_AllocKernelMem(sizeof *dgInfo + (size_t)dg->payloadSize,
(VMCI_MEMORY_ATOMIC |
VMCI_MEMORY_NONPAGED));
if (NULL == dgInfo) {
Atomic_Dec(&delayedDGHostQueueSize);
VMCIResource_Release(resource);
return VMCI_ERROR_NO_MEM;
}
dgInfo->inDGHostQueue = TRUE;
dgInfo->entry = dstEntry;
memcpy(&dgInfo->msg, dg, dgSize);
retval = VMCI_ScheduleDelayedWork(VMCIDatagramDelayedDispatchCB, dgInfo);
if (retval < VMCI_SUCCESS) {
VMCI_WARNING((LGPFX"Failed to schedule delayed work for datagram "
"(result=%d).\n", retval));
VMCI_FreeKernelMem(dgInfo, sizeof *dgInfo + (size_t)dg->payloadSize);
VMCIResource_Release(resource);
Atomic_Dec(&delayedDGHostQueueSize);
return retval;
}
} else {
retval = dstEntry->recvCB(dstEntry->clientData, dg);
VMCIResource_Release(resource);
if (retval < VMCI_SUCCESS) {
return retval;
}
}
} else {
/*
* Route to destination VM context.
*/
VMCIDatagram *newDG;
if (contextID != dg->dst.context) {
if (VMCIDenyInteraction(srcPrivFlags,
vmci_context_get_priv_flags(dg->dst.context))) {
VMCI_DEBUG_LOG(4, (LGPFX"Interaction denied (%X/%X - %X/%X)\n",
contextID, srcPrivFlags,
dg->dst.context,
vmci_context_get_priv_flags(dg->dst.context)));
return VMCI_ERROR_NO_ACCESS;
} else if (VMCI_CONTEXT_IS_VM(contextID)) {
/*
* If the sending context is a VM, it cannot reach another VM.
*/
if (!vmkernel) {
VMCI_DEBUG_LOG(4, (LGPFX"Datagram communication between VMs not "
"supported (src=0x%x, dst=0x%x).\n",
contextID, dg->dst.context));
return VMCI_ERROR_DST_UNREACHABLE;
}
}
}
/* We make a copy to enqueue. */
newDG = VMCI_AllocKernelMem(dgSize, VMCI_MEMORY_NORMAL);
if (newDG == NULL) {
VMCI_DEBUG_LOG(4, (LGPFX"No memory for datagram\n"));
return VMCI_ERROR_NO_MEM;
}
memcpy(newDG, dg, dgSize);
retval = VMCIContext_EnqueueDatagram(dg->dst.context, newDG);
if (retval < VMCI_SUCCESS) {
VMCI_FreeKernelMem(newDG, dgSize);
VMCI_DEBUG_LOG(4, (LGPFX"Enqueue failed\n"));
return retval;
}
}
/* The datagram is freed when the context reads it. */
/* Chatty. */
// VMCI_DEBUG_LOG(10, (LGPFX"Sent datagram (size=%u bytes).\n",
// (uint32)dgSize));
/*
* We currently truncate the size to signed 32 bits. This doesn't
* matter for this handler as it only support 4Kb messages.
*/
return (int)dgSize;
}