void otf_removeCell_task(void) { open_addr_t neighbor; bool foundNeighbor; // get preferred parent foundNeighbor = neighbors_getPreferredParentEui64(&neighbor); if (foundNeighbor==FALSE) { return; } // call sixtop sixtop_removeCell( &neighbor ); }
/** \brief Retrieve the next hop's address from routing table. \param[in] destination128b Final IPv6 destination address. \param[out] addressToWrite64b Location to write the EUI64 of next hop to. */ void forwarding_getNextHop(OpenMote* self, open_addr_t* destination128b, open_addr_t* addressToWrite64b) { uint8_t i; open_addr_t temp_prefix64btoWrite; if ( packetfunctions_isBroadcastMulticast(self, destination128b)) { // IP destination is broadcast, send to 0xffffffffffffffff addressToWrite64b->type = ADDR_64B; for (i=0;i<8;i++) { addressToWrite64b->addr_64b[i] = 0xff; } } else if ( neighbors_isStableNeighbor(self, destination128b)) { // IP destination is 1-hop neighbor, send directly packetfunctions_ip128bToMac64b(self, destination128b,&temp_prefix64btoWrite,addressToWrite64b); } else { // destination is remote, send to preferred parent neighbors_getPreferredParentEui64(self, addressToWrite64b); } }
/** \brief Prepare and a send a RPL DAO. */ void sendDAO() { OpenQueueEntry_t* msg; // pointer to DAO messages uint8_t nbrIdx; // running neighbor index uint8_t numTransitParents,numTargetParents; // the number of parents indicated in transit option open_addr_t address; open_addr_t* prefix; if (ieee154e_isSynch()==FALSE) { // I'm not sync'ed // delete packets genereted by this module (DIO and DAO) from openqueue openqueue_removeAllCreatedBy(COMPONENT_ICMPv6RPL); // I'm not busy sending a DIO/DAO icmpv6rpl_vars.busySending = FALSE; // stop here return; } // dont' send a DAO if you're in bridge mode if (idmanager_getIsBridge()==TRUE) { return; } // dont' send a DAO if you did not acquire a DAGrank if (neighbors_getMyDAGrank()==DEFAULTDAGRANK) { return; } // dont' send a DAO if you're still busy sending the previous one if (icmpv6rpl_vars.busySending==TRUE) { return; } // if you get here, you start construct DAO // reserve a free packet buffer for DAO msg = openqueue_getFreePacketBuffer(COMPONENT_ICMPv6RPL); if (msg==NULL) { openserial_printError(COMPONENT_ICMPv6RPL,ERR_NO_FREE_PACKET_BUFFER, (errorparameter_t)0, (errorparameter_t)0); return; } // take ownership msg->creator = COMPONENT_ICMPv6RPL; msg->owner = COMPONENT_ICMPv6RPL; // set transport information msg->l4_protocol = IANA_ICMPv6; msg->l4_sourcePortORicmpv6Type = IANA_ICMPv6_RPL; // set DAO destination msg->l3_destinationAdd.type=ADDR_128B; memcpy(msg->l3_destinationAdd.addr_128b,icmpv6rpl_vars.dio.DODAGID,sizeof(icmpv6rpl_vars.dio.DODAGID)); //===== fill in packet //NOTE: limit to preferrred parent only the number of DAO transit addresses to send //=== transit option -- from RFC 6550, page 55 - 1 transit information header per parent is required. //getting only preferred parent as transit numTransitParents=0; neighbors_getPreferredParentEui64(&address); packetfunctions_writeAddress(msg,&address,OW_BIG_ENDIAN); prefix=idmanager_getMyID(ADDR_PREFIX); packetfunctions_writeAddress(msg,prefix,OW_BIG_ENDIAN); // update transit info fields // from rfc6550 p.55 -- Variable, depending on whether or not the DODAG ParentAddress subfield is present. // poipoi xv: it is not very clear if this includes all fields in the header. or as target info 2 bytes are removed. // using the same pattern as in target information. icmpv6rpl_vars.dao_transit.optionLength = LENGTH_ADDR128b + sizeof(icmpv6rpl_dao_transit_ht)-2; icmpv6rpl_vars.dao_transit.PathControl=0; //todo. this is to set the preference of this parent. icmpv6rpl_vars.dao_transit.type=OPTION_TRANSIT_INFORMATION_TYPE; // write transit info in packet packetfunctions_reserveHeaderSize(msg,sizeof(icmpv6rpl_dao_transit_ht)); memcpy( ((icmpv6rpl_dao_transit_ht*)(msg->payload)), &(icmpv6rpl_vars.dao_transit), sizeof(icmpv6rpl_dao_transit_ht) ); numTransitParents++; //target information is required. RFC 6550 page 55. /* One or more Transit Information options MUST be preceded by one or more RPL Target options. */ numTargetParents = 0; for (nbrIdx=0;nbrIdx<MAXNUMNEIGHBORS;nbrIdx++) { if ((neighbors_isNeighborWithHigherDAGrank(nbrIdx))==TRUE) { // this neighbor is of higher DAGrank as I am. so it is my child // write it's address in DAO RFC6550 page 80 check point 1. neighbors_getNeighbor(&address,ADDR_64B,nbrIdx); packetfunctions_writeAddress(msg,&address,OW_BIG_ENDIAN); prefix=idmanager_getMyID(ADDR_PREFIX); packetfunctions_writeAddress(msg,prefix,OW_BIG_ENDIAN); // update target info fields // from rfc6550 p.55 -- Variable, length of the option in octets excluding the Type and Length fields. // poipoi xv: assuming that type and length fields refer to the 2 first bytes of the header icmpv6rpl_vars.dao_target.optionLength = LENGTH_ADDR128b +sizeof(icmpv6rpl_dao_target_ht) - 2; //no header type and length icmpv6rpl_vars.dao_target.type = OPTION_TARGET_INFORMATION_TYPE; icmpv6rpl_vars.dao_target.flags = 0; //must be 0 icmpv6rpl_vars.dao_target.prefixLength = 128; //128 leading bits -- full address. // write transit info in packet packetfunctions_reserveHeaderSize(msg,sizeof(icmpv6rpl_dao_target_ht)); memcpy( ((icmpv6rpl_dao_target_ht*)(msg->payload)), &(icmpv6rpl_vars.dao_target), sizeof(icmpv6rpl_dao_target_ht) ); // remember I found it numTargetParents++; } //limit to MAX_TARGET_PARENTS the number of DAO target addresses to send //section 8.2.1 pag 67 RFC6550 -- using a subset // poipoi TODO base selection on ETX rather than first X. if (numTargetParents>=MAX_TARGET_PARENTS) break; } // stop here if no parents found if (numTransitParents==0) { openqueue_freePacketBuffer(msg); return; } icmpv6rpl_vars.dao_transit.PathSequence++; //increment path sequence. // if you get here, you will send a DAO //=== DAO header packetfunctions_reserveHeaderSize(msg,sizeof(icmpv6rpl_dao_ht)); memcpy( ((icmpv6rpl_dao_ht*)(msg->payload)), &(icmpv6rpl_vars.dao), sizeof(icmpv6rpl_dao_ht) ); //=== ICMPv6 header packetfunctions_reserveHeaderSize(msg,sizeof(ICMPv6_ht)); ((ICMPv6_ht*)(msg->payload))->type = msg->l4_sourcePortORicmpv6Type; ((ICMPv6_ht*)(msg->payload))->code = IANA_ICMPv6_RPL_DAO; packetfunctions_calculateChecksum(msg,(uint8_t*)&(((ICMPv6_ht*)(msg->payload))->checksum)); //call last //===== send if (icmpv6_send(msg)==E_SUCCESS) { icmpv6rpl_vars.busySending = TRUE; } else { openqueue_freePacketBuffer(msg); } }