int
athenaInterestControl(Athena *athena, CCNxInterest *interest, PARCBitVector *ingressVector)
{
CCNxMetaMessage *responseMessage = NULL;
CCNxName *ccnxName = ccnxInterest_GetName(interest);
CCNxName *ccnxComponentName = ccnxName_CreateFromCString(CCNxNameAthena_Control);
if (ccnxName_StartsWith(ccnxName, ccnxComponentName) == true) {
responseMessage = _Control_Command(athena, interest);
}
ccnxName_Release(&ccnxComponentName);
ccnxComponentName = ccnxName_CreateFromCString(CCNxNameAthena_Link);
if (ccnxName_StartsWith(ccnxName, ccnxComponentName) == true) {
responseMessage = _TransportLinkAdapter_Command(athena, interest);
}
ccnxName_Release(&ccnxComponentName);
ccnxComponentName = ccnxName_CreateFromCString(CCNxNameAthena_FIB);
if (ccnxName_StartsWith(ccnxName, ccnxComponentName) == true) {
responseMessage = _FIB_Command(athena, interest, ingressVector);
}
ccnxName_Release(&ccnxComponentName);
ccnxComponentName = ccnxName_CreateFromCString(CCNxNameAthena_PIT);
if (ccnxName_StartsWith(ccnxName, ccnxComponentName) == true) {
responseMessage = _PIT_Command(athena, interest);
}
ccnxName_Release(&ccnxComponentName);
ccnxComponentName = ccnxName_CreateFromCString(CCNxNameAthena_ContentStore);
if (ccnxName_StartsWith(ccnxName, ccnxComponentName) == true) {
responseMessage = _ContentStore_Command(athena, interest);
}
ccnxName_Release(&ccnxComponentName);
if (responseMessage) {
athena_ProcessMessage(athena, responseMessage, ingressVector);
ccnxContentObject_Release(&responseMessage);
}
return 0;
}
static void
_processInterest(Athena *athena, CCNxInterest *interest, PARCBitVector *ingressVector)
{
uint8_t hoplimit;
//
// * (0) Hoplimit check, exclusively on interest messages
//
int linkId = parcBitVector_NextBitSet(ingressVector, 0);
if (athenaTransportLinkAdapter_IsNotLocal(athena->athenaTransportLinkAdapter, linkId)) {
hoplimit = ccnxInterest_GetHopLimit(interest);
if (hoplimit == 0) {
// We should never receive a message with a hoplimit of 0 from a non-local source.
parcLog_Error(athena->log,
"Received a message with a hoplimit of zero from a non-local source (%s).",
athenaTransportLinkAdapter_LinkIdToName(athena->athenaTransportLinkAdapter, linkId));
return;
}
ccnxInterest_SetHopLimit(interest, hoplimit - 1);
}
//
// * (1) if the interest is in the ContentStore, reply and return,
// assuming that other PIT entries were satisified when the content arrived.
//
CCNxMetaMessage *content = athenaContentStore_GetMatch(athena->athenaContentStore, interest);
if (content) {
const char *ingressVectorString = parcBitVector_ToString(ingressVector);
parcLog_Debug(athena->log, "Forwarding content from store to %s", ingressVectorString);
parcMemory_Deallocate(&ingressVectorString);
PARCBitVector *result = athenaTransportLinkAdapter_Send(athena->athenaTransportLinkAdapter, content, ingressVector);
if (result) { // failed channels - client will resend interest unless we wish to optimize things here
parcBitVector_Release(&result);
}
return;
}
//
// * (2) add it to the PIT, if it was aggregated or there was an error we're done, otherwise we
// forward the interest. The expectedReturnVector is populated with information we get from
// the FIB and used to verify content objects ingress ports when they arrive.
//
PARCBitVector *expectedReturnVector;
AthenaPITResolution result;
if ((result = athenaPIT_AddInterest(athena->athenaPIT, interest, ingressVector, &expectedReturnVector)) != AthenaPITResolution_Forward) {
if (result == AthenaPITResolution_Error) {
parcLog_Error(athena->log, "PIT resolution error");
}
return;
}
// Divert interests destined to the forwarder, we assume these are control messages
CCNxName *ccnxName = ccnxInterest_GetName(interest);
if (ccnxName_StartsWith(ccnxName, athena->athenaName) == true) {
_processInterestControl(athena, interest, ingressVector);
return;
}
//
// * (3) if it's in the FIB, forward, then update the PIT expectedReturnVector so we can verify
// when the returned object arrives that it came from an interface it was expected from.
// Interest messages with a hoplimit of 0 will never be sent out by the link adapter to a
// non-local interface so we need not check that here.
//
ccnxName = ccnxInterest_GetName(interest);
PARCBitVector *egressVector = athenaFIB_Lookup(athena->athenaFIB, ccnxName);
if (egressVector != NULL) {
// Remove the link the interest came from if it was included in the FIB entry
parcBitVector_ClearVector(egressVector, ingressVector);
// If no links remain, send a no route interest return message
if (parcBitVector_NumberOfBitsSet(egressVector) == 0) {
CCNxInterestReturn *interestReturn = ccnxInterestReturn_Create(interest, CCNxInterestReturn_ReturnCode_NoRoute);
PARCBitVector *result = athenaTransportLinkAdapter_Send(athena->athenaTransportLinkAdapter, interestReturn, ingressVector);
parcBitVector_Release(&result);
ccnxInterestReturn_Release(&interestReturn);
} else {
parcBitVector_SetVector(expectedReturnVector, egressVector);
PARCBitVector *result = athenaTransportLinkAdapter_Send(athena->athenaTransportLinkAdapter, interest, egressVector);
if (result) { // remove failed channels - client will resend interest unless we wish to optimize here
parcBitVector_ClearVector(expectedReturnVector, result);
parcBitVector_Release(&result);
}
}
} else {
// No FIB entry found, return a NoRoute interest return and remove the entry from the PIT.
CCNxInterestReturn *interestReturn = ccnxInterestReturn_Create(interest, CCNxInterestReturn_ReturnCode_NoRoute);
PARCBitVector *result = athenaTransportLinkAdapter_Send(athena->athenaTransportLinkAdapter, interestReturn, ingressVector);
parcBitVector_Release(&result);
ccnxInterestReturn_Release(&interestReturn);
const char *name = ccnxName_ToString(ccnxName);
if (athenaPIT_RemoveInterest(athena->athenaPIT, interest, ingressVector) != true) {
parcLog_Error(athena->log, "Unable to remove interest (%s) from the PIT.", name);
}
parcLog_Debug(athena->log, "Name (%s) not found in FIB and no default route. Message dropped.", name);
parcMemory_Deallocate(&name);
}
}