/** \brief Indicate whether some neighbor is a stable neighbor \param[in] address The address of the neighbor, a full 128-bit IPv6 addres. \returns TRUE if that neighbor is stable, FALSE otherwise. */ bool neighbors_isStableNeighbor(open_addr_t* address) { uint8_t i; open_addr_t temp_addr_64b; open_addr_t temp_prefix; bool returnVal; // by default, not stable returnVal = FALSE; // but neighbor's IPv6 address in prefix and EUI64 switch (address->type) { case ADDR_128B: packetfunctions_ip128bToMac64b(address,&temp_prefix,&temp_addr_64b); break; default: openserial_printCritical(COMPONENT_NEIGHBORS,ERR_WRONG_ADDR_TYPE, (errorparameter_t)address->type, (errorparameter_t)0); return returnVal; } // iterate through neighbor table for (i=0;i<MAXNUMNEIGHBORS;i++) { if (isThisRowMatching(&temp_addr_64b,i) && neighbors_vars.neighbors[i].stableNeighbor==TRUE) { returnVal = TRUE; break; } } return returnVal; }
void getNextHop(open_addr_t* destination128b, open_addr_t* addressToWrite64b) { uint8_t i; open_addr_t temp_prefix64btoWrite; if (packetfunctions_isBroadcastMulticast(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(destination128b)) { // IP destination is 1-hop neighbor, send directly packetfunctions_ip128bToMac64b(destination128b,&temp_prefix64btoWrite,addressToWrite64b); } else { // destination is remote, send to preferred parent neighbors_getPreferredParent(addressToWrite64b,ADDR_64B); } }
bool neighbors_isStableNeighbor(open_addr_t* address) { uint8_t i; open_addr_t temp_addr_64b; open_addr_t temp_prefix; switch (address->type) { case ADDR_128B: packetfunctions_ip128bToMac64b(address,&temp_prefix,&temp_addr_64b); break; default: openserial_printError(COMPONENT_NEIGHBORS,ERR_WRONG_ADDR_TYPE, (errorparameter_t)address->type, (errorparameter_t)0); return FALSE; } for (i=0;i<MAXNUMNEIGHBORS;i++) { if (isThisRowMatching(&temp_addr_64b,i) && neighbors_vars.neighbors[i].stableNeighbor==TRUE) { return TRUE; } } return FALSE; }
/** \brief Send a packet originating at this mote. This function is called by an upper layer, and only concerns packets originated at this mote. \param[in,out] msg Packet to send. */ owerror_t forwarding_send(OpenMote* self, OpenQueueEntry_t* msg) { ipv6_header_iht ipv6_outer_header; ipv6_header_iht ipv6_inner_header; rpl_option_ht rpl_option; open_addr_t* myprefix; open_addr_t* myadd64; uint32_t flow_label = 0; open_addr_t temp_dest_prefix; open_addr_t temp_dest_mac64b; open_addr_t* p_dest; open_addr_t* p_src; open_addr_t temp_src_prefix; open_addr_t temp_src_mac64b; uint8_t sam; uint8_t m; uint8_t dam; // take ownership over the packet msg->owner = COMPONENT_FORWARDING; m = IPHC_M_NO; // retrieve my prefix and EUI64 myprefix = idmanager_getMyID(self, ADDR_PREFIX); myadd64 = idmanager_getMyID(self, ADDR_64B); // set source address (me) msg->l3_sourceAdd.type=ADDR_128B; memcpy(&(msg->l3_sourceAdd.addr_128b[0]),myprefix->prefix,8); memcpy(&(msg->l3_sourceAdd.addr_128b[8]),myadd64->addr_64b,8); // initialize IPv6 header memset(&ipv6_outer_header,0,sizeof(ipv6_header_iht)); memset(&ipv6_inner_header,0,sizeof(ipv6_header_iht)); // Set hop limit to the default in-network value as this packet is being // sent from upper layer. This is done here as send_internal() is used by // forwarding of packets as well which carry a hlim. This value is required // to be set to a value as the following function can decrement it. ipv6_inner_header.hop_limit = IPHC_DEFAULT_HOP_LIMIT; // create the RPL hop-by-hop option forwarding_createRplOption(self, &rpl_option, // rpl_option to fill in 0x00 // flags ); packetfunctions_ip128bToMac64b(self, &(msg->l3_destinationAdd),&temp_dest_prefix,&temp_dest_mac64b); //xv poipoi -- get the src prefix as well packetfunctions_ip128bToMac64b(self, &(msg->l3_sourceAdd),&temp_src_prefix,&temp_src_mac64b); //XV -poipoi we want to check if the source address prefix is the same as destination prefix if ( packetfunctions_sameAddress(self, &temp_dest_prefix,&temp_src_prefix)) { // same prefix use 64B address sam = IPHC_SAM_64B; dam = IPHC_DAM_64B; p_dest = &temp_dest_mac64b; p_src = &temp_src_mac64b; } else { //not the same prefix. so the packet travels to another network //check if this is a source routing pkt. in case it is then the DAM is elided as it is in the SrcRouting header. if ( packetfunctions_isBroadcastMulticast(self, &(msg->l3_destinationAdd))==FALSE){ sam = IPHC_SAM_128B; dam = IPHC_DAM_128B; p_dest = &(msg->l3_destinationAdd); p_src = &(msg->l3_sourceAdd); ipv6_outer_header.src.type = ADDR_128B; memcpy(&ipv6_outer_header.src,p_src,sizeof(open_addr_t)); ipv6_outer_header.hop_limit = IPHC_DEFAULT_HOP_LIMIT; } else { // this is DIO, source address elided, multicast bit is set sam = IPHC_SAM_ELIDED; m = IPHC_M_YES; dam = IPHC_DAM_ELIDED; p_dest = &(msg->l3_destinationAdd); p_src = &(msg->l3_sourceAdd); } } //IPHC inner header and NHC IPv6 header will be added at here iphc_prependIPv6Header(self, msg, IPHC_TF_ELIDED, flow_label, // value_flowlabel IPHC_NH_INLINE, msg->l4_protocol, IPHC_HLIM_64, ipv6_outer_header.hop_limit, IPHC_CID_NO, IPHC_SAC_STATELESS, sam, m, IPHC_DAC_STATELESS, dam, p_dest, p_src, PCKTSEND ); // both of them are compressed ipv6_outer_header.next_header_compressed = TRUE; return forwarding_send_internal_RoutingTable(self, msg, &ipv6_outer_header, &ipv6_inner_header, &rpl_option, &flow_label, PCKTSEND ); }
/** \brief Send a packet using the source rout to find the next hop. \note This is always called for packets being forwarded. How to process the routing header is detailed in http://tools.ietf.org/html/rfc6554#page-9. \param[in,out] msg The packet to send. \param[in] ipv6_header The packet's IPv6 header. */ owerror_t forwarding_send_internal_SourceRouting(OpenMote* self, OpenQueueEntry_t* msg, ipv6_header_iht* ipv6_outer_header, ipv6_header_iht* ipv6_inner_header, rpl_option_ht* rpl_option ) { uint8_t temp_8b; uint8_t type; uint8_t next_type; uint8_t size; uint8_t next_size; uint8_t hlen; open_addr_t firstAddr; open_addr_t nextAddr; open_addr_t temp_prefix; open_addr_t temp_addr64; uint8_t rpi_length; uint8_t flags; uint16_t senderRank; uint8_t RH3_copy[127]; uint8_t RH3_length; memset(&RH3_copy[0],0,127); RH3_length = 0; memcpy(&msg->l3_destinationAdd,&ipv6_inner_header->dest,sizeof(open_addr_t)); memcpy(&msg->l3_sourceAdd,&ipv6_inner_header->src,sizeof(open_addr_t)); // initial first Address by compression reference firstAddr.type = ADDR_128B; if (ipv6_outer_header->src.type != ADDR_NONE){ if (rpl_option->rplInstanceID == 0){ icmpv6rpl_getRPLDODAGid(self, &firstAddr.addr_128b[0]); } } else { memcpy(&firstAddr,&ipv6_inner_header->src,sizeof(open_addr_t)); } hlen = 0; temp_8b = *((uint8_t*)(msg->payload)+hlen); type = *((uint8_t*)(msg->payload)+hlen+1); hlen += 2; // get the first address switch(type){ case RH3_6LOTH_TYPE_0: memcpy(&firstAddr.addr_128b[15],msg->payload+hlen,1); hlen += 1; break; case RH3_6LOTH_TYPE_1: memcpy(&firstAddr.addr_128b[14],msg->payload+hlen,2); hlen += 2; break; case RH3_6LOTH_TYPE_2: memcpy(&firstAddr.addr_128b[12],msg->payload+hlen,4); hlen += 4; break; case RH3_6LOTH_TYPE_3: memcpy(&firstAddr.addr_128b[8],msg->payload+hlen,8); hlen += 8; break; case RH3_6LOTH_TYPE_4: memcpy(&firstAddr.addr_128b[0],msg->payload+hlen,16); hlen += 16; break; } packetfunctions_ip128bToMac64b(self, &firstAddr,&temp_prefix,&temp_addr64); if ( packetfunctions_sameAddress(self, &temp_prefix, idmanager_getMyID(self, ADDR_PREFIX)) && packetfunctions_sameAddress(self, &temp_addr64, idmanager_getMyID(self, ADDR_64B)) ){ size = temp_8b & RH3_6LOTH_SIZE_MASK; if (size > 0){ // there are at least 2 entries in the header, // the router removes the first entry and decrements the Size (by 1) size -= 1; packetfunctions_tossHeader(self, msg,hlen); packetfunctions_reserveHeaderSize(self, msg,2); msg->payload[0] = CRITICAL_6LORH | size; msg->payload[1] = type; // get next hop memcpy(&nextAddr,&firstAddr,sizeof(open_addr_t)); switch(type){ case RH3_6LOTH_TYPE_0: memcpy(&nextAddr.addr_128b[15],msg->payload+2,1); break; case RH3_6LOTH_TYPE_1: memcpy(&nextAddr.addr_128b[14],msg->payload+2,2); break; case RH3_6LOTH_TYPE_2: memcpy(&nextAddr.addr_128b[12],msg->payload+2,4); break; case RH3_6LOTH_TYPE_3: memcpy(&nextAddr.addr_128b[8],msg->payload+2,8); break; case RH3_6LOTH_TYPE_4: memcpy(&nextAddr.addr_128b[0],msg->payload+2,16); break; } packetfunctions_ip128bToMac64b(self, &nextAddr, &temp_prefix, &msg->l2_nextORpreviousHop ); } else { temp_8b = *((uint8_t*)(msg->payload)+hlen); next_type = *((uint8_t*)(msg->payload)+hlen+1); if ( (temp_8b & FORMAT_6LORH_MASK) == CRITICAL_6LORH && next_type<=RH3_6LOTH_TYPE_4 ) { // there is another RH3-6LoRH following, check the type if (next_type >= type){ packetfunctions_tossHeader(self, msg,hlen); // get next hop memcpy(&nextAddr,&firstAddr,sizeof(open_addr_t)); switch(next_type){ case RH3_6LOTH_TYPE_0: memcpy(&nextAddr.addr_128b[15],msg->payload+2,1); break; case RH3_6LOTH_TYPE_1: memcpy(&nextAddr.addr_128b[14],msg->payload+2,2); break; case RH3_6LOTH_TYPE_2: memcpy(&nextAddr.addr_128b[12],msg->payload+2,4); break; case RH3_6LOTH_TYPE_3: memcpy(&nextAddr.addr_128b[8],msg->payload+2,8); break; case RH3_6LOTH_TYPE_4: memcpy(&nextAddr.addr_128b[0],msg->payload+2,16); break; } packetfunctions_ip128bToMac64b(self, &nextAddr, &temp_prefix, &msg->l2_nextORpreviousHop ); } else { hlen += 2; switch(next_type){ case RH3_6LOTH_TYPE_0: memcpy(&firstAddr.addr_128b[15],msg->payload+hlen,1); hlen += 1; break; case RH3_6LOTH_TYPE_1: memcpy(&firstAddr.addr_128b[14],msg->payload+hlen,2); hlen += 2; break; case RH3_6LOTH_TYPE_2: memcpy(&firstAddr.addr_128b[12],msg->payload+hlen,4); hlen += 4; break; case RH3_6LOTH_TYPE_3: memcpy(&firstAddr.addr_128b[8],msg->payload+hlen,8); hlen += 8; break; } next_size = temp_8b & RH3_6LOTH_SIZE_MASK; packetfunctions_tossHeader(self, msg,hlen); if (next_size>0){ next_size -= 1; packetfunctions_reserveHeaderSize(self, msg,2); msg->payload[0] = CRITICAL_6LORH | next_size; msg->payload[1] = next_type; } // add first address switch(type){ case RH3_6LOTH_TYPE_0: packetfunctions_reserveHeaderSize(self, msg,1); msg->payload[0] = firstAddr.addr_128b[15]; break; case RH3_6LOTH_TYPE_1: packetfunctions_reserveHeaderSize(self, msg,2); memcpy(&msg->payload[0],&firstAddr.addr_128b[14],2); break; case RH3_6LOTH_TYPE_2: packetfunctions_reserveHeaderSize(self, msg,4); memcpy(&msg->payload[0],&firstAddr.addr_128b[12],4); break; case RH3_6LOTH_TYPE_3: packetfunctions_reserveHeaderSize(self, msg,8); memcpy(&msg->payload[0],&firstAddr.addr_128b[8],8); break; case RH3_6LOTH_TYPE_4: packetfunctions_reserveHeaderSize(self, msg,16); memcpy(&msg->payload[0],&firstAddr.addr_128b[0],16); break; } packetfunctions_reserveHeaderSize(self, msg,2); msg->payload[0] = CRITICAL_6LORH | 0; msg->payload[1] = type; packetfunctions_ip128bToMac64b(self, &firstAddr, &temp_prefix, &msg->l2_nextORpreviousHop ); } } else { // there is no next RH3-6loRH, remove current one packetfunctions_tossHeader(self, msg,hlen); packetfunctions_ip128bToMac64b(self, &msg->l3_destinationAdd, &temp_prefix, &msg->l2_nextORpreviousHop ); } } } else { // log error openserial_printError(self, COMPONENT_IPHC, ERR_6LOWPAN_UNSUPPORTED, (errorparameter_t)16, (errorparameter_t)(temp_addr64.addr_64b[7]) ); } // copy RH3s before toss them if ( ipv6_outer_header->src.type != ADDR_NONE && ipv6_outer_header->hopByhop_option != NULL ){ // check the length of RH3s RH3_length = ipv6_outer_header->hopByhop_option-msg->payload; memcpy(&RH3_copy[0],msg->payload,RH3_length); packetfunctions_tossHeader(self, msg,RH3_length); // retrieve hop-by-hop header (includes RPL option) rpi_length = iphc_retrieveIPv6HopByHopHeader(self, msg, rpl_option ); // toss the headers packetfunctions_tossHeader(self, msg, rpi_length ); flags = rpl_option->flags; senderRank = rpl_option->senderRank; if ((flags & O_FLAG)!=O_FLAG){ // wrong direction // log error openserial_printError(self, COMPONENT_FORWARDING, ERR_WRONG_DIRECTION, (errorparameter_t)flags, (errorparameter_t)senderRank ); } if (senderRank > neighbors_getMyDAGrank(self)){ // loop detected // set flag rpl_option->flags |= R_FLAG; // log error openserial_printError(self, COMPONENT_FORWARDING, ERR_LOOP_DETECTED, (errorparameter_t) senderRank, (errorparameter_t) neighbors_getMyDAGrank(self) ); } forwarding_createRplOption(self, rpl_option, rpl_option->flags); // toss the IP in IP 6LoRH packetfunctions_tossHeader(self, msg, ipv6_outer_header->header_length); } else { RH3_length = 0; } // send to next lower layer return iphc_sendFromForwarding(self, msg, ipv6_outer_header, ipv6_inner_header, rpl_option, &ipv6_outer_header->flow_label, &RH3_copy[0], RH3_length, PCKTFORWARD ); }