/** * 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; }