/**
* This is called as sendMessage() by the switch.
* There is only one switch interface which sends all traffic.
* message is aligned on the beginning of the switch header.
*/
static uint8_t incomingFromSwitch(struct Message* message, struct Interface* switchIf)
{
struct Ducttape* context = switchIf->senderContext;
struct Headers_SwitchHeader* switchHeader = (struct Headers_SwitchHeader*) message->bytes;
Message_shift(message, -Headers_SwitchHeader_SIZE);
// The label comes in reversed from the switch because the switch doesn't know that we aren't
// another switch ready to parse more bits, bit reversing the label yields the source address.
switchHeader->label_be = Bits_bitReverse64(switchHeader->label_be);
if (Headers_getMessageType(switchHeader) == Headers_SwitchHeader_TYPE_CONTROL) {
uint8_t labelStr[20];
uint64_t label = Endian_bigEndianToHost64(switchHeader->label_be);
AddrTools_printPath(labelStr, label);
if (message->length < Control_HEADER_SIZE) {
Log_info1(context->logger, "dropped runt ctrl packet from [%s]", labelStr);
return Error_NONE;
} else {
Log_debug1(context->logger, "ctrl packet from [%s]", labelStr);
}
struct Control* ctrl = (struct Control*) message->bytes;
bool pong = false;
if (ctrl->type_be == Control_ERROR_be) {
if (message->length < Control_Error_MIN_SIZE) {
Log_info1(context->logger, "dropped runt error packet from [%s]", labelStr);
return Error_NONE;
}
Log_info2(context->logger,
"error packet from [%s], error type [%d]",
labelStr,
Endian_bigEndianToHost32(ctrl->content.error.errorType_be));
RouterModule_brokenPath(Endian_bigEndianToHost64(switchHeader->label_be),
context->routerModule);
uint8_t causeType = Headers_getMessageType(&ctrl->content.error.cause);
if (causeType == Headers_SwitchHeader_TYPE_CONTROL) {
if (message->length < Control_Error_MIN_SIZE + Control_HEADER_SIZE) {
Log_info1(context->logger,
"error packet from [%s] containing runt cause packet",
labelStr);
return Error_NONE;
}
struct Control* causeCtrl = (struct Control*) &(&ctrl->content.error.cause)[1];
if (causeCtrl->type_be != Control_PING_be) {
Log_info3(context->logger,
"error packet from [%s] caused by [%s] packet ([%d])",
labelStr,
Control_typeString(causeCtrl->type_be),
Endian_bigEndianToHost16(causeCtrl->type_be));
} else {
Log_debug2(context->logger,
"error packet from [%s] in response to ping, length: [%d].",
labelStr,
message->length);
// errors resulting from pings are forwarded back to the pinger.
pong = true;
}
} else if (causeType != Headers_SwitchHeader_TYPE_DATA) {
Log_info1(context->logger,
"error packet from [%s] containing cause of unknown type [%d]",
labelStr);
}
} else if (ctrl->type_be == Control_PONG_be) {
pong = true;
} else if (ctrl->type_be == Control_PING_be) {
ctrl->type_be = Control_PONG_be;
Message_shift(message, Headers_SwitchHeader_SIZE);
switchIf->receiveMessage(message, switchIf);
} else {
Log_info2(context->logger,
"control packet of unknown type from [%s], type [%d]",
labelStr, Endian_bigEndianToHost16(ctrl->type_be));
}
if (pong) {
// Shift back over the header
Message_shift(message, Headers_SwitchHeader_SIZE);
context->switchPingerIf->receiveMessage(message, context->switchPingerIf);
}
return Error_NONE;
}
uint8_t* herKey = extractPublicKey(message, switchHeader->label_be, context->logger);
int herAddrIndex;
if (herKey) {
uint8_t herAddrStore[16];
AddressCalc_addressForPublicKey(herAddrStore, herKey);
if (herAddrStore[0] != 0xFC) {
Log_debug(context->logger,
"Got message from peer whose address is not in fc00::/8 range.\n");
return 0;
}
herAddrIndex = AddressMapper_put(switchHeader->label_be, herAddrStore, &context->addrMap);
} else {
herAddrIndex = AddressMapper_indexOf(switchHeader->label_be, &context->addrMap);
if (herAddrIndex == -1) {
uint64_t label = Endian_bigEndianToHost64(switchHeader->label_be);
struct Node* n = RouterModule_getNode(label, context->routerModule);
if (n) {
herAddrIndex = AddressMapper_put(switchHeader->label_be,
n->address.ip6.bytes,
&context->addrMap);
} else {
#ifdef Log_DEBUG
uint8_t switchAddr[20];
AddrTools_printPath(switchAddr, Endian_bigEndianToHost64(switchHeader->label_be));
Log_debug1(context->logger,
"Dropped traffic packet from unknown node. (%s)\n",
&switchAddr);
#endif
return 0;
}
}
}
// If the source address is the same as the router address, no third layer of crypto.
context->routerAddress = context->addrMap.entries[herAddrIndex].address;
// This is needed so that the priority and other information
// from the switch header can be passed on properly.
context->switchHeader = switchHeader;
context->session = SessionManager_getSession(context->routerAddress, herKey, context->sm);
// This goes to incomingFromCryptoAuth()
// then incomingFromRouter() then core()
context->layer = OUTER_LAYER;
context->session->receiveMessage(message, context->session);
return 0;
}
/**
* This is called as sendMessage() by the switch.
* There is only one switch interface which sends all traffic.
* message is aligned on the beginning of the switch header.
*/
static uint8_t incomingFromSwitch(struct Message* message, struct Interface* switchIf)
{
struct Context* context = switchIf->senderContext;
struct Headers_SwitchHeader* switchHeader = (struct Headers_SwitchHeader*) message->bytes;
Message_shift(message, -Headers_SwitchHeader_SIZE);
// The label comes in reversed from the switch because the switch doesn't know that we aren't
// another switch ready to parse more bits, bit reversing the label yields the source address.
switchHeader->label_be = Bits_bitReverse64(switchHeader->label_be);
if (Headers_getMessageType(switchHeader) == MessageType_CONTROL) {
struct Control* ctrl = (struct Control*) (switchHeader + 1);
if (ctrl->type_be == Control_ERROR_be) {
if (memcmp(&ctrl->content.error.cause.label_be, &switchHeader->label_be, 8)) {
Log_warn(context->logger,
"Different label for cause than return packet, this shouldn't happen. "
"Perhaps a packet was corrupted.\n");
return 0;
}
uint32_t errType_be = ctrl->content.error.errorType_be;
if (errType_be == Endian_bigEndianToHost32(Error_MALFORMED_ADDRESS)) {
Log_info(context->logger, "Got malformed-address error, removing route.\n");
RouterModule_brokenPath(switchHeader->label_be, context->routerModule);
return 0;
}
Log_info1(context->logger,
"Got error packet, error type: %d",
Endian_bigEndianToHost32(errType_be));
}
return 0;
}
uint8_t* herKey = extractPublicKey(message, switchHeader->label_be, context->logger);
int herAddrIndex;
if (herKey) {
uint8_t herAddrStore[16];
AddressCalc_addressForPublicKey(herAddrStore, herKey);
if (herAddrStore[0] != 0xFC) {
Log_debug(context->logger,
"Got message from peer whose address is not in fc00::/8 range.\n");
return 0;
}
herAddrIndex = AddressMapper_put(switchHeader->label_be, herAddrStore, &context->addrMap);
} else {
herAddrIndex = AddressMapper_indexOf(switchHeader->label_be, &context->addrMap);
if (herAddrIndex == -1) {
struct Node* n = RouterModule_getNode(switchHeader->label_be, context->routerModule);
if (n) {
herAddrIndex = AddressMapper_put(switchHeader->label_be,
n->address.ip6.bytes,
&context->addrMap);
} else {
#ifdef Log_DEBUG
uint8_t switchAddr[20];
struct Address addr;
addr.networkAddress_be = switchHeader->label_be;
Address_printNetworkAddress(switchAddr, &addr);
Log_debug1(context->logger,
"Dropped traffic packet from unknown node. (%s)\n",
&switchAddr);
#endif
return 0;
}
}
}
uint8_t* herAddr = context->addrMap.addresses[herAddrIndex];
// This is needed so that the priority and other information
// from the switch header can be passed on properly.
context->switchHeader = switchHeader;
context->session = SessionManager_getSession(herAddr, herKey, context->sm);
// This goes to incomingFromCryptoAuth()
// then incomingFromRouter() then core()
context->layer = OUTER_LAYER;
context->session->receiveMessage(message, context->session);
return 0;
}
