/*
* --------------------------------------------------------------------------
* This function activates the switch by initializing it with all the runtime
* state. First it queries all of the MAC addresses set as custom switch policy
* to allow sends from, and adds tme to the property list. Then it queries the
* NIC list and verifies it can support all of the NICs currently connected to
* the switch, and adds the NICs to the NIC list.
* --------------------------------------------------------------------------
*/
static NDIS_STATUS
OvsActivateSwitch(POVS_SWITCH_CONTEXT switchContext)
{
NDIS_STATUS status;
ASSERT(!switchContext->isActivated);
OVS_LOG_TRACE("Enter: activate switch %p, dpNo: %ld",
switchContext, switchContext->dpNo);
status = OvsAddConfiguredSwitchPorts(switchContext);
if (status != NDIS_STATUS_SUCCESS) {
OVS_LOG_WARN("Failed to add configured switch ports");
goto cleanup;
}
status = OvsInitConfiguredSwitchNics(switchContext);
if (status != NDIS_STATUS_SUCCESS) {
OVS_LOG_WARN("Failed to add configured vports");
OvsClearAllSwitchVports(switchContext);
goto cleanup;
}
switchContext->isActivated = TRUE;
OvsPostEvent(OVS_DEFAULT_PORT_NO, OVS_DEFAULT_EVENT_STATUS);
cleanup:
OVS_LOG_TRACE("Exit: activate switch:%p, isActivated: %s, status = %lx",
switchContext,
(switchContext->isActivated ? "TRUE" : "FALSE"), status);
return status;
}
/*
* ---------------------------------------------------------------------------
* Validate the netlink attribute against the policy
* ---------------------------------------------------------------------------
*/
BOOLEAN
NlAttrValidate(const PNL_ATTR nla, const PNL_POLICY policy)
{
UINT32 minLen;
UINT32 maxLen;
UINT32 len;
BOOLEAN ret = FALSE;
if ((policy->type == NL_A_NO_ATTR) ||
(policy->type == NL_A_VAR_LEN) ||
(policy->type == NL_A_NESTED)) {
/* Do not validate anything for attributes of type var length */
ret = TRUE;
goto done;
}
/* Figure out min and max length. */
minLen = policy->minLen;
if (!minLen) {
minLen = NlAttrMinLen(policy->type);
}
maxLen = policy->maxLen;
if (!maxLen) {
maxLen = NlAttrMaxLen(policy->type);
}
/* Verify length. */
len = NlAttrGetSize(nla);
if (len < minLen || len > maxLen) {
OVS_LOG_WARN("Attribute: %p, len: %d, not in valid range, "
"min: %d, max: %d", nla, len, minLen, maxLen);
goto done;
}
/* Strings must be null terminated and must not have embedded nulls. */
if (policy->type == NL_A_STRING) {
if (((PCHAR) nla)[nla->nlaLen - 1]) {
OVS_LOG_WARN("Attributes %p lacks null at the end", nla);
goto done;
}
if (memchr(nla + 1, '\0', len - 1) != NULL) {
OVS_LOG_WARN("Attributes %p has bad length", nla);
goto done;
}
}
ret = TRUE;
done:
return ret;
}
/*
*----------------------------------------------------------------------------
* Parses the netlink message at a given offset (attrOffset)
* as a series of attributes. A pointer to the attribute with type
* 'type' is stored in attrs at index 'type'. policy is used to define the
* attribute type validation parameters.
* 'nla_offset' should be NLMSG_HDRLEN + GENL_HDRLEN + OVS_HEADER
*
* Returns BOOLEAN to indicate success/failure.
*----------------------------------------------------------------------------
*/
BOOLEAN
NlAttrParse(const PNL_MSG_HDR nlMsg, UINT32 attrOffset,
UINT32 totalAttrLen,
const NL_POLICY policy[],
PNL_ATTR attrs[], UINT32 n_attrs)
{
PNL_ATTR nla;
UINT32 left;
UINT32 iter;
BOOLEAN ret = FALSE;
RtlZeroMemory(attrs, n_attrs * sizeof *attrs);
/* There is nothing to parse */
if (!(NlMsgAttrsLen(nlMsg))) {
ret = TRUE;
goto done;
}
if ((NlMsgSize(nlMsg) < attrOffset)) {
OVS_LOG_WARN("No attributes in nlMsg: %p at offset: %d",
nlMsg, attrOffset);
goto done;
}
NL_ATTR_FOR_EACH (nla, left, NlMsgAt(nlMsg, attrOffset),
totalAttrLen)
{
UINT16 type = NlAttrType(nla);
if (type < n_attrs && policy[type].type != NL_A_NO_ATTR) {
/* Typecasting to keep the compiler happy */
const PNL_POLICY e = (const PNL_POLICY)(&policy[type]);
if (!NlAttrValidate(nla, e)) {
goto done;
}
if (attrs[type]) {
OVS_LOG_WARN("Duplicate attribute in nlMsg: %p, "
"type: %u", nlMsg, type);
}
attrs[type] = nla;
}
}
/*
* --------------------------------------------------------------------------
* Implements filter driver's FilterRestart function.
* --------------------------------------------------------------------------
*/
_Use_decl_annotations_
NDIS_STATUS
OvsExtRestart(NDIS_HANDLE filterModuleContext,
PNDIS_FILTER_RESTART_PARAMETERS filterRestartParameters)
{
POVS_SWITCH_CONTEXT switchContext = (POVS_SWITCH_CONTEXT)filterModuleContext;
NDIS_STATUS status = NDIS_STATUS_SUCCESS;
BOOLEAN switchActive;
UNREFERENCED_PARAMETER(filterRestartParameters);
OVS_LOG_TRACE("Enter: filterModuleContext %p",
filterModuleContext);
/* Activate the switch if this is the first restart. */
if (!switchContext->isActivated && !switchContext->isActivateFailed) {
status = OvsQuerySwitchActivationComplete(switchContext,
&switchActive);
if (status != NDIS_STATUS_SUCCESS) {
switchContext->isActivateFailed = TRUE;
status = NDIS_STATUS_RESOURCES;
goto cleanup;
}
if (switchActive) {
status = OvsActivateSwitch(switchContext);
if (status != NDIS_STATUS_SUCCESS) {
OVS_LOG_WARN("Failed to activate switch, dpNo:%d",
switchContext->dpNo);
status = NDIS_STATUS_RESOURCES;
goto cleanup;
}
}
}
ASSERT(switchContext->dataFlowState == OvsSwitchPaused);
switchContext->dataFlowState = OvsSwitchRunning;
cleanup:
OVS_LOG_TRACE("Exit: Restart switch:%p, dpNo: %d, status: %#x",
switchContext, switchContext->dpNo, status);
return status;
}
/*
* ---------------------------------------------------------------------------
* Default maximum payload size for each type of attribute.
* ---------------------------------------------------------------------------
*/
UINT32
NlAttrMaxLen(NL_ATTR_TYPE type)
{
switch (type) {
case NL_A_NO_ATTR: return SIZE_MAX;
case NL_A_UNSPEC: return SIZE_MAX;
case NL_A_U8: return 1;
case NL_A_U16: return 2;
case NL_A_U32: return 4;
case NL_A_U64: return 8;
case NL_A_STRING: return MAXUINT16;
case NL_A_FLAG: return SIZE_MAX;
case NL_A_NESTED: return SIZE_MAX;
case N_NL_ATTR_TYPES:
default:
OVS_LOG_WARN("Unsupprted attribute type: %d", type);
ASSERT(0);
}
/* To keep compiler happy */
return 0;
}
/*
*----------------------------------------------------------------------------
* Traverses all attributes in received buffer in order to insure all are valid
*----------------------------------------------------------------------------
*/
BOOLEAN NlValidateAllAttrs(const PNL_MSG_HDR nlMsg, UINT32 attrOffset,
UINT32 totalAttrLen,
const NL_POLICY policy[], const UINT32 numPolicy)
{
PNL_ATTR nla;
INT left;
BOOLEAN ret = TRUE;
if ((NlMsgSize(nlMsg) < attrOffset)) {
OVS_LOG_WARN("No attributes in nlMsg: %p at offset: %d",
nlMsg, attrOffset);
ret = FALSE;
goto done;
}
NL_ATTR_FOR_EACH_UNSAFE(nla, left, NlMsgAt(nlMsg, attrOffset),
totalAttrLen)
{
if (!NlAttrIsValid(nla, left)) {
ret = FALSE;
goto done;
}
UINT16 type = NlAttrType(nla);
if (type < numPolicy && policy[type].type != NL_A_NO_ATTR) {
/* Typecasting to keep the compiler happy */
const PNL_POLICY e = (const PNL_POLICY)(&policy[type]);
if (!NlAttrValidate(nla, e)) {
ret = FALSE;
goto done;
}
}
}
done:
return ret;
}
