/*
*----------------------------------------------------------------------------
* 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;
}
}
/*
*----------------------------------------------------------------------------
* 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;
}
