void tcpip_ipv6_output(void) { uip_ds6_nbr_t *nbr = NULL; uip_ipaddr_t *nexthop; if(uip_len == 0) { return; } if(uip_len > UIP_LINK_MTU) { UIP_LOG("tcpip_ipv6_output: Packet to big"); uip_clear_buf(); return; } if(uip_is_addr_unspecified(&UIP_IP_BUF->destipaddr)){ UIP_LOG("tcpip_ipv6_output: Destination address unspecified"); uip_clear_buf(); return; } if(!uip_is_addr_mcast(&UIP_IP_BUF->destipaddr)) { /* Next hop determination */ nbr = NULL; /* We first check if the destination address is on our immediate link. If so, we simply use the destination address as our nexthop address. */ if(uip_ds6_is_addr_onlink(&UIP_IP_BUF->destipaddr)){ nexthop = &UIP_IP_BUF->destipaddr; } else { uip_ds6_route_t *route; /* Check if we have a route to the destination address. */ route = uip_ds6_route_lookup(&UIP_IP_BUF->destipaddr); /* No route was found - we send to the default route instead. */ if(route == NULL) { PRINTF("tcpip_ipv6_output: no route found, using default route\n"); nexthop = uip_ds6_defrt_choose(); if(nexthop == NULL) { #ifdef UIP_FALLBACK_INTERFACE PRINTF("FALLBACK: removing ext hdrs & setting proto %d %d\n", uip_ext_len, *((uint8_t *)UIP_IP_BUF + 40)); if(uip_ext_len > 0) { extern void remove_ext_hdr(void); uint8_t proto = *((uint8_t *)UIP_IP_BUF + 40); remove_ext_hdr(); /* This should be copied from the ext header... */ UIP_IP_BUF->proto = proto; } /* Inform the other end that the destination is not reachable. If it's * not informed routes might get lost unexpectedly until there's a need * to send a new packet to the peer */ if(UIP_FALLBACK_INTERFACE.output() < 0) { PRINTF("FALLBACK: output error. Reporting DST UNREACH\n"); uip_icmp6_error_output(ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_ADDR, 0); uip_flags = 0; tcpip_ipv6_output(); return; } #else PRINTF("tcpip_ipv6_output: Destination off-link but no route\n"); #endif /* !UIP_FALLBACK_INTERFACE */ uip_clear_buf(); return; } } else { /* A route was found, so we look up the nexthop neighbor for the route. */ nexthop = uip_ds6_route_nexthop(route); /* If the nexthop is dead, for example because the neighbor never responded to link-layer acks, we drop its route. */ if(nexthop == NULL) { #if UIP_CONF_IPV6_RPL /* If we are running RPL, and if we are the root of the network, we'll trigger a global repair berfore we remove the route. */ rpl_dag_t *dag; rpl_instance_t *instance; dag = (rpl_dag_t *)route->state.dag; if(dag != NULL) { instance = dag->instance; rpl_repair_root(instance->instance_id); } #endif /* UIP_CONF_IPV6_RPL */ uip_ds6_route_rm(route); /* We don't have a nexthop to send the packet to, so we drop it. */ return; } } #if TCPIP_CONF_ANNOTATE_TRANSMISSIONS if(nexthop != NULL) { static uint8_t annotate_last; static uint8_t annotate_has_last = 0; if(annotate_has_last) { printf("#L %u 0; red\n", annotate_last); } printf("#L %u 1; red\n", nexthop->u8[sizeof(uip_ipaddr_t) - 1]); annotate_last = nexthop->u8[sizeof(uip_ipaddr_t) - 1]; annotate_has_last = 1; } #endif /* TCPIP_CONF_ANNOTATE_TRANSMISSIONS */ } /* End of next hop determination */ #if UIP_CONF_IPV6_RPL if(rpl_update_header_final(nexthop)) { uip_clear_buf(); return; } #endif /* UIP_CONF_IPV6_RPL */ nbr = uip_ds6_nbr_lookup(nexthop); if(nbr == NULL) { #if UIP_ND6_SEND_NA if((nbr = uip_ds6_nbr_add(nexthop, NULL, 0, NBR_INCOMPLETE)) == NULL) { uip_clear_buf(); return; } else { #if UIP_CONF_IPV6_QUEUE_PKT /* Copy outgoing pkt in the queuing buffer for later transmit. */ if(uip_packetqueue_alloc(&nbr->packethandle, UIP_DS6_NBR_PACKET_LIFETIME) != NULL) { memcpy(uip_packetqueue_buf(&nbr->packethandle), UIP_IP_BUF, uip_len); uip_packetqueue_set_buflen(&nbr->packethandle, uip_len); } #endif /* RFC4861, 7.2.2: * "If the source address of the packet prompting the solicitation is the * same as one of the addresses assigned to the outgoing interface, that * address SHOULD be placed in the IP Source Address of the outgoing * solicitation. Otherwise, any one of the addresses assigned to the * interface should be used."*/ if(uip_ds6_is_my_addr(&UIP_IP_BUF->srcipaddr)){ uip_nd6_ns_output(&UIP_IP_BUF->srcipaddr, NULL, &nbr->ipaddr); } else { uip_nd6_ns_output(NULL, NULL, &nbr->ipaddr); } stimer_set(&nbr->sendns, uip_ds6_if.retrans_timer / 1000); nbr->nscount = 1; /* Send the first NS try from here (multicast destination IP address). */ } #else /* UIP_ND6_SEND_NA */ uip_len = 0; return; #endif /* UIP_ND6_SEND_NA */ } else { #if UIP_ND6_SEND_NA if(nbr->state == NBR_INCOMPLETE) { PRINTF("tcpip_ipv6_output: nbr cache entry incomplete\n"); #if UIP_CONF_IPV6_QUEUE_PKT /* Copy outgoing pkt in the queuing buffer for later transmit and set the destination nbr to nbr. */ if(uip_packetqueue_alloc(&nbr->packethandle, UIP_DS6_NBR_PACKET_LIFETIME) != NULL) { memcpy(uip_packetqueue_buf(&nbr->packethandle), UIP_IP_BUF, uip_len); uip_packetqueue_set_buflen(&nbr->packethandle, uip_len); } #endif /*UIP_CONF_IPV6_QUEUE_PKT*/ uip_clear_buf(); return; } /* Send in parallel if we are running NUD (nbc state is either STALE, DELAY, or PROBE). See RFC 4861, section 7.3.3 on node behavior. */ if(nbr->state == NBR_STALE) { nbr->state = NBR_DELAY; stimer_set(&nbr->reachable, UIP_ND6_DELAY_FIRST_PROBE_TIME); nbr->nscount = 0; PRINTF("tcpip_ipv6_output: nbr cache entry stale moving to delay\n"); } #endif /* UIP_ND6_SEND_NA */ tcpip_output(uip_ds6_nbr_get_ll(nbr)); #if UIP_CONF_IPV6_QUEUE_PKT /* * Send the queued packets from here, may not be 100% perfect though. * This happens in a few cases, for example when instead of receiving a * NA after sendiong a NS, you receive a NS with SLLAO: the entry moves * to STALE, and you must both send a NA and the queued packet. */ if(uip_packetqueue_buflen(&nbr->packethandle) != 0) { uip_len = uip_packetqueue_buflen(&nbr->packethandle); memcpy(UIP_IP_BUF, uip_packetqueue_buf(&nbr->packethandle), uip_len); uip_packetqueue_free(&nbr->packethandle); tcpip_output(uip_ds6_nbr_get_ll(nbr)); } #endif /*UIP_CONF_IPV6_QUEUE_PKT*/ uip_clear_buf(); return; } } /* Multicast IP destination address. */ tcpip_output(NULL); uip_clear_buf(); }
void tcpip_ipv6_output(void) { uip_ds6_nbr_t *nbr = NULL; uip_ipaddr_t *nexthop; if(uip_len == 0) { return; } if(uip_len > UIP_LINK_MTU) { UIP_LOG("tcpip_ipv6_output: Packet to big"); uip_len = 0; return; } if(uip_is_addr_unspecified(&UIP_IP_BUF->destipaddr)) { UIP_LOG("tcpip_ipv6_output: Destination address unspecified"); uip_len = 0; return; } if(!uip_is_addr_mcast(&UIP_IP_BUF->destipaddr)) { /* Next hop determination */ nbr = NULL; if(uip_ds6_is_addr_onlink(&UIP_IP_BUF->destipaddr)) { nexthop = &UIP_IP_BUF->destipaddr; } else { uip_ds6_route_t* locrt; locrt = uip_ds6_route_lookup(&UIP_IP_BUF->destipaddr); if(locrt == NULL) { if((nexthop = uip_ds6_defrt_choose()) == NULL) { #ifdef UIP_FALLBACK_INTERFACE PRINTF("FALLBACK: removing ext hdrs & setting proto %d %d\n", uip_ext_len, *((uint8_t *)UIP_IP_BUF + 40)); if(uip_ext_len > 0) { extern void remove_ext_hdr(void); uint8_t proto = *((uint8_t *)UIP_IP_BUF + 40); remove_ext_hdr(); /* This should be copied from the ext header... */ UIP_IP_BUF->proto = proto; } UIP_FALLBACK_INTERFACE.output(); #else PRINTF("tcpip_ipv6_output: Destination off-link but no route\n"); #endif /* !UIP_FALLBACK_INTERFACE */ uip_len = 0; return; } } else { nexthop = &locrt->nexthop; } #if TCPIP_CONF_ANNOTATE_TRANSMISSIONS if(nexthop != NULL) { printf("#L %u 1; red\n", nexthop->u8[sizeof(uip_ipaddr_t) - 1]); } #endif /* TCPIP_CONF_ANNOTATE_TRANSMISSIONS */ } /* End of next hop determination */ #if UIP_CONF_IPV6_RPL if(rpl_update_header_final(nexthop)) { uip_len = 0; return; } #endif /* UIP_CONF_IPV6_RPL */ if((nbr = uip_ds6_nbr_lookup(nexthop)) == NULL) { #if UIP_ND6_SEND_NA if((nbr = uip_ds6_nbr_add(nexthop, NULL, 0, NBR_INCOMPLETE)) == NULL) { uip_len = 0; return; } else { #if UIP_CONF_IPV6_QUEUE_PKT /* Copy outgoing pkt in the queuing buffer for later transmit. */ if(uip_packetqueue_alloc(&nbr->packethandle, UIP_DS6_NBR_PACKET_LIFETIME) != NULL) { memcpy(uip_packetqueue_buf(&nbr->packethandle), UIP_IP_BUF, uip_len); uip_packetqueue_set_buflen(&nbr->packethandle, uip_len); } #endif /* RFC4861, 7.2.2: * "If the source address of the packet prompting the solicitation is the * same as one of the addresses assigned to the outgoing interface, that * address SHOULD be placed in the IP Source Address of the outgoing * solicitation. Otherwise, any one of the addresses assigned to the * interface should be used."*/ if(uip_ds6_is_my_addr(&UIP_IP_BUF->srcipaddr)) { uip_nd6_ns_output(&UIP_IP_BUF->srcipaddr, NULL, &nbr->ipaddr); } else { uip_nd6_ns_output(NULL, NULL, &nbr->ipaddr); } stimer_set(&nbr->sendns, uip_ds6_if.retrans_timer / 1000); nbr->nscount = 1; } #endif /* UIP_ND6_SEND_NA */ } else { #if UIP_ND6_SEND_NA if(nbr->state == NBR_INCOMPLETE) { PRINTF("tcpip_ipv6_output: nbr cache entry incomplete\n"); #if UIP_CONF_IPV6_QUEUE_PKT /* Copy outgoing pkt in the queuing buffer for later transmit and set the destination nbr to nbr. */ if(uip_packetqueue_alloc(&nbr->packethandle, UIP_DS6_NBR_PACKET_LIFETIME) != NULL) { memcpy(uip_packetqueue_buf(&nbr->packethandle), UIP_IP_BUF, uip_len); uip_packetqueue_set_buflen(&nbr->packethandle, uip_len); } #endif /*UIP_CONF_IPV6_QUEUE_PKT*/ uip_len = 0; return; } /* Send in parallel if we are running NUD (nbc state is either STALE, DELAY, or PROBE). See RFC 4861, section 7.7.3 on node behavior. */ if(nbr->state == NBR_STALE) { nbr->state = NBR_DELAY; stimer_set(&nbr->reachable, UIP_ND6_DELAY_FIRST_PROBE_TIME); nbr->nscount = 0; PRINTF("tcpip_ipv6_output: nbr cache entry stale moving to delay\n"); } #endif /* UIP_ND6_SEND_NA */ tcpip_output(&nbr->lladdr); #if UIP_CONF_IPV6_QUEUE_PKT /* * Send the queued packets from here, may not be 100% perfect though. * This happens in a few cases, for example when instead of receiving a * NA after sendiong a NS, you receive a NS with SLLAO: the entry moves * to STALE, and you must both send a NA and the queued packet. */ if(uip_packetqueue_buflen(&nbr->packethandle) != 0) { uip_len = uip_packetqueue_buflen(&nbr->packethandle); memcpy(UIP_IP_BUF, uip_packetqueue_buf(&nbr->packethandle), uip_len); uip_packetqueue_free(&nbr->packethandle); tcpip_output(&nbr->lladdr); } #endif /*UIP_CONF_IPV6_QUEUE_PKT*/ uip_len = 0; return; } } /* Multicast IP destination address. */ tcpip_output(NULL); uip_len = 0; uip_ext_len = 0; }
/** * Neighbor Advertisement Processing * * we might have to send a pkt that had been buffered while address * resolution was performed (if we support buffering, see UIP_CONF_QUEUE_PKT) * * As per RFC 4861, on link layer that have addresses, TLLAO options MUST be * included when responding to multicast solicitations, SHOULD be included in * response to unicast (here we assume it is for now) * * NA can be received after sending NS for DAD, Address resolution or NUD. Can * be unsolicited as well. * It can trigger update of the state of the neighbor in the neighbor cache, * router in the router list. * If the NS was for DAD, it means DAD failed * */ static void na_input(void) { #if CETIC_6LBR_SMARTBRIDGE uip_ds6_route_t * route; #endif uint8_t is_llchange; uint8_t is_router; uint8_t is_solicited; uint8_t is_override; PRINTF("Received NA from"); PRINT6ADDR(&UIP_IP_BUF->srcipaddr); PRINTF("to"); PRINT6ADDR(&UIP_IP_BUF->destipaddr); PRINTF("with target address"); PRINT6ADDR((uip_ipaddr_t *) (&UIP_ND6_NA_BUF->tgtipaddr)); PRINTF("\n"); UIP_STAT(++uip_stat.nd6.recv); /* * booleans. the three last one are not 0 or 1 but 0 or 0x80, 0x40, 0x20 * but it works. Be careful though, do not use tests such as is_router == 1 */ is_llchange = 0; is_router = ((UIP_ND6_NA_BUF->flagsreserved & UIP_ND6_NA_FLAG_ROUTER)); is_solicited = ((UIP_ND6_NA_BUF->flagsreserved & UIP_ND6_NA_FLAG_SOLICITED)); is_override = ((UIP_ND6_NA_BUF->flagsreserved & UIP_ND6_NA_FLAG_OVERRIDE)); #if UIP_CONF_IPV6_CHECKS if((UIP_IP_BUF->ttl != UIP_ND6_HOP_LIMIT) || (UIP_ICMP_BUF->icode != 0) || (uip_is_addr_mcast(&UIP_ND6_NA_BUF->tgtipaddr)) || (is_solicited && uip_is_addr_mcast(&UIP_IP_BUF->destipaddr))) { PRINTF("NA received is bad\n"); goto discard; } #endif /*UIP_CONF_IPV6_CHECKS */ /* Options processing: we handle TLLAO, and must ignore others */ nd6_opt_offset = UIP_ND6_NA_LEN; nd6_opt_llao = NULL; while(uip_l3_icmp_hdr_len + nd6_opt_offset < uip_len) { #if UIP_CONF_IPV6_CHECKS if(UIP_ND6_OPT_HDR_BUF->len == 0) { PRINTF("NA received is bad\n"); goto discard; } #endif /*UIP_CONF_IPV6_CHECKS */ switch (UIP_ND6_OPT_HDR_BUF->type) { case UIP_ND6_OPT_TLLAO: nd6_opt_llao = (uint8_t *)UIP_ND6_OPT_HDR_BUF; break; default: PRINTF("ND option not supported in NA\n"); break; } nd6_opt_offset += (UIP_ND6_OPT_HDR_BUF->len << 3); } #if CETIC_6LBR_SMARTBRIDGE /* Address Advertisement */ if ( (nvm_data.mode & CETIC_MODE_SMART_MULTI_BR) != 0 ) { if (uip_is_addr_mcast(&UIP_IP_BUF->destipaddr) && uip_is_mcast_group_id_all_nodes(&UIP_IP_BUF->destipaddr)) { LOG6LBR_6ADDR(INFO, &UIP_ND6_NA_BUF->tgtipaddr, "Received purge NA for "); #if CETIC_NODE_INFO node_info_rm_by_addr(&UIP_ND6_NA_BUF->tgtipaddr); #endif route = uip_ds6_route_lookup(&UIP_ND6_NA_BUF->tgtipaddr); if (route != NULL ) { uip_ds6_route_rm(route); } goto discard; } } #endif addr = uip_ds6_addr_lookup(&UIP_ND6_NA_BUF->tgtipaddr); /* Message processing, including TLLAO if any */ if(addr != NULL) { #if UIP_ND6_DEF_MAXDADNS > 0 if(addr->state == ADDR_TENTATIVE) { uip_ds6_dad_failed(addr); } #endif /*UIP_ND6_DEF_MAXDADNS > 0 */ PRINTF("NA received is bad\n"); goto discard; } else { uip_lladdr_t *lladdr; nbr = uip_ds6_nbr_lookup(&UIP_ND6_NA_BUF->tgtipaddr); lladdr = (uip_lladdr_t *)uip_ds6_nbr_get_ll(nbr); if(nbr == NULL) { goto discard; } if(nd6_opt_llao != 0) { is_llchange = memcmp(&nd6_opt_llao[UIP_ND6_OPT_DATA_OFFSET], (void *)lladdr, UIP_LLADDR_LEN); } if(nbr->state == NBR_INCOMPLETE) { if(nd6_opt_llao == NULL) { goto discard; } memcpy(lladdr, &nd6_opt_llao[UIP_ND6_OPT_DATA_OFFSET], UIP_LLADDR_LEN); if(is_solicited) { nbr->state = NBR_REACHABLE; nbr->nscount = 0; /* reachable time is stored in ms */ stimer_set(&(nbr->reachable), uip_ds6_if.reachable_time / 1000); } else { nbr->state = NBR_STALE; } nbr->isrouter = is_router; } else { if(!is_override && is_llchange) { if(nbr->state == NBR_REACHABLE) { nbr->state = NBR_STALE; } goto discard; } else { if(is_override || (!is_override && nd6_opt_llao != 0 && !is_llchange) || nd6_opt_llao == 0) { if(nd6_opt_llao != 0) { memcpy(lladdr, &nd6_opt_llao[UIP_ND6_OPT_DATA_OFFSET], UIP_LLADDR_LEN); } if(is_solicited) { nbr->state = NBR_REACHABLE; /* reachable time is stored in ms */ stimer_set(&(nbr->reachable), uip_ds6_if.reachable_time / 1000); } else { if(nd6_opt_llao != 0 && is_llchange) { nbr->state = NBR_STALE; } } } } if(nbr->isrouter && !is_router) { defrt = uip_ds6_defrt_lookup(&UIP_IP_BUF->srcipaddr); if(defrt != NULL) { uip_ds6_defrt_rm(defrt); } } nbr->isrouter = is_router; } } #if UIP_CONF_IPV6_QUEUE_PKT /* The nbr is now reachable, check if we had buffered a pkt for it */ /*if(nbr->queue_buf_len != 0) { uip_len = nbr->queue_buf_len; memcpy(UIP_IP_BUF, nbr->queue_buf, uip_len); nbr->queue_buf_len = 0; return; }*/ if(uip_packetqueue_buflen(&nbr->packethandle) != 0) { uip_len = uip_packetqueue_buflen(&nbr->packethandle); memcpy(UIP_IP_BUF, uip_packetqueue_buf(&nbr->packethandle), uip_len); uip_packetqueue_free(&nbr->packethandle); return; } #endif /*UIP_CONF_IPV6_QUEUE_PKT */ discard: uip_clear_buf(); return; }
void tcpip_ipv6_output(void) { uip_ds6_nbr_t *nbr = NULL; uip_ipaddr_t *nexthop; uip_ds6_route_t *route = NULL; if(uip_len == 0) { return; } PRINTF("IPv6 packet send from "); PRINT6ADDR(&UIP_IP_BUF->srcipaddr); PRINTF(" to "); PRINT6ADDR(&UIP_IP_BUF->destipaddr); PRINTF("\n"); if(uip_len > UIP_LINK_MTU) { UIP_LOG("tcpip_ipv6_output: Packet to big"); uip_clear_buf(); return; } if(uip_is_addr_unspecified(&UIP_IP_BUF->destipaddr)){ UIP_LOG("tcpip_ipv6_output: Destination address unspecified"); uip_clear_buf(); return; } if(!uip_is_addr_mcast(&UIP_IP_BUF->destipaddr)) { /* Next hop determination */ nbr = NULL; /* We first check if the destination address is on our immediate link. If so, we simply use the destination address as our nexthop address. */ if(uip_ds6_is_addr_onlink(&UIP_IP_BUF->destipaddr)){ nexthop = &UIP_IP_BUF->destipaddr; } else { /* Check if we have a route to the destination address. */ route = uip_ds6_route_lookup(&UIP_IP_BUF->destipaddr); /* No route was found - we send to the default route instead. */ if(route == NULL) { #if CETIC_6LBR_SMARTBRIDGE if (uip_ipaddr_prefixcmp(&wsn_net_prefix, &UIP_IP_BUF->destipaddr, 64)) { /* In smart-bridge mode, there is no route towards hosts on the Ethernet side Therefore we have to check the destination and assume the host is on-link */ nexthop = &UIP_IP_BUF->destipaddr; } else #endif #if CETIC_6LBR_ROUTER && UIP_CONF_IPV6_RPL if (is_dodag_root() && uip_ipaddr_prefixcmp(&wsn_net_prefix, &UIP_IP_BUF->destipaddr, 64)) { //In router mode, we drop packets towards unknown mote PRINTF("Dropping wsn packet with no route\n"); uip_len = 0; return; } else #endif #if CETIC_6LBR_IP64 if(ip64_addr_is_ip64(&UIP_IP_BUF->destipaddr)) { #if UIP_CONF_IPV6_RPL rpl_remove_header(); #endif IP64_CONF_UIP_FALLBACK_INTERFACE.output(); uip_len = 0; uip_ext_len = 0; return; } else #endif { PRINTF("tcpip_ipv6_output: no route found, using default route\n"); nexthop = uip_ds6_defrt_choose(); } if(nexthop == NULL) { #ifdef UIP_FALLBACK_INTERFACE PRINTF("FALLBACK: removing ext hdrs & setting proto %d %d\n", uip_ext_len, *((uint8_t *)UIP_IP_BUF + 40)); if(uip_ext_len > 0) { extern void remove_ext_hdr(void); uint8_t proto = *((uint8_t *)UIP_IP_BUF + 40); remove_ext_hdr(); /* This should be copied from the ext header... */ UIP_IP_BUF->proto = proto; } UIP_FALLBACK_INTERFACE.output(); #else PRINTF("tcpip_ipv6_output: Destination off-link but no route\n"); #endif /* !UIP_FALLBACK_INTERFACE */ uip_clear_buf(); return; } } else { /* A route was found, so we look up the nexthop neighbor for the route. */ nexthop = uip_ds6_route_nexthop(route); /* If the nexthop is dead, for example because the neighbor never responded to link-layer acks, we drop its route. */ if(nexthop == NULL) { #if UIP_CONF_IPV6_RPL /* If we are running RPL, and if we are the root of the network, we'll trigger a DIO before we remove the route. */ rpl_dag_t *dag; dag = (rpl_dag_t *)route->state.dag; if(dag != NULL) { rpl_reset_dio_timer(dag->instance); } #endif /* UIP_CONF_IPV6_RPL */ uip_ds6_route_rm(route); /* We don't have a nexthop to send the packet to, so we drop it. */ return; } } #if TCPIP_CONF_ANNOTATE_TRANSMISSIONS if(nexthop != NULL) { static uint8_t annotate_last; static uint8_t annotate_has_last = 0; if(annotate_has_last) { printf("#L %u 0; red\n", annotate_last); } printf("#L %u 1; red\n", nexthop->u8[sizeof(uip_ipaddr_t) - 1]); annotate_last = nexthop->u8[sizeof(uip_ipaddr_t) - 1]; annotate_has_last = 1; } #endif /* TCPIP_CONF_ANNOTATE_TRANSMISSIONS */ } /* End of next hop determination */ #if UIP_CONF_IPV6_RPL if(rpl_update_header_final(nexthop)) { uip_clear_buf(); return; } #endif /* UIP_CONF_IPV6_RPL */ nbr = uip_ds6_nbr_lookup(nexthop); if(nbr == NULL) { #if UIP_ND6_SEND_NA #if CETIC_6LBR && UIP_CONF_IPV6_RPL /* Don't perform NUD if it has been disabled for WSN */ if((nvm_data.global_flags & CETIC_GLOBAL_DISABLE_WSN_NUD) != 0 && uip_ipaddr_prefixcmp(&wsn_net_prefix, &UIP_IP_BUF->destipaddr, 64) && route != NULL) { uip_clear_buf(); return; } #endif if((nbr = uip_ds6_nbr_add(nexthop, NULL, 0, NBR_INCOMPLETE)) == NULL) { uip_clear_buf(); return; } else { #if UIP_CONF_IPV6_QUEUE_PKT /* Copy outgoing pkt in the queuing buffer for later transmit. */ if(uip_packetqueue_alloc(&nbr->packethandle, UIP_DS6_NBR_PACKET_LIFETIME) != NULL) { memcpy(uip_packetqueue_buf(&nbr->packethandle), UIP_IP_BUF, uip_len); uip_packetqueue_set_buflen(&nbr->packethandle, uip_len); } #endif /* RFC4861, 7.2.2: * "If the source address of the packet prompting the solicitation is the * same as one of the addresses assigned to the outgoing interface, that * address SHOULD be placed in the IP Source Address of the outgoing * solicitation. Otherwise, any one of the addresses assigned to the * interface should be used."*/ if(uip_ds6_is_my_addr(&UIP_IP_BUF->srcipaddr)){ uip_nd6_ns_output(&UIP_IP_BUF->srcipaddr, NULL, &nbr->ipaddr); } else { uip_nd6_ns_output(NULL, NULL, &nbr->ipaddr); } stimer_set(&nbr->sendns, uip_ds6_if.retrans_timer / 1000); nbr->nscount = 1; /* Send the first NS try from here (multicast destination IP address). */ } #else /* UIP_ND6_SEND_NA */ uip_len = 0; return; #endif /* UIP_ND6_SEND_NA */ } else { #if UIP_ND6_SEND_NA if(nbr->state == NBR_INCOMPLETE) { PRINTF("tcpip_ipv6_output: nbr cache entry incomplete\n"); #if UIP_CONF_IPV6_QUEUE_PKT /* Copy outgoing pkt in the queuing buffer for later transmit and set the destination nbr to nbr. */ if(uip_packetqueue_alloc(&nbr->packethandle, UIP_DS6_NBR_PACKET_LIFETIME) != NULL) { memcpy(uip_packetqueue_buf(&nbr->packethandle), UIP_IP_BUF, uip_len); uip_packetqueue_set_buflen(&nbr->packethandle, uip_len); } #endif /*UIP_CONF_IPV6_QUEUE_PKT*/ uip_clear_buf(); return; } /* Send in parallel if we are running NUD (nbc state is either STALE, DELAY, or PROBE). See RFC 4861, section 7.3.3 on node behavior. */ #if CETIC_6LBR && UIP_CONF_IPV6_RPL /* Don't update nbr state if we don't want to perform NUD for WSN */ if((nvm_data.global_flags & CETIC_GLOBAL_DISABLE_WSN_NUD) == 0 || !uip_ipaddr_prefixcmp(&wsn_net_prefix, &UIP_IP_BUF->destipaddr, 64) || route == NULL) #endif if(nbr->state == NBR_STALE) { nbr->state = NBR_DELAY; stimer_set(&nbr->reachable, UIP_ND6_DELAY_FIRST_PROBE_TIME); nbr->nscount = 0; PRINTF("tcpip_ipv6_output: nbr cache entry stale moving to delay\n"); } #endif /* UIP_ND6_SEND_NA */ tcpip_output(uip_ds6_nbr_get_ll(nbr)); #if UIP_CONF_IPV6_QUEUE_PKT /* * Send the queued packets from here, may not be 100% perfect though. * This happens in a few cases, for example when instead of receiving a * NA after sendiong a NS, you receive a NS with SLLAO: the entry moves * to STALE, and you must both send a NA and the queued packet. */ if(uip_packetqueue_buflen(&nbr->packethandle) != 0) { uip_len = uip_packetqueue_buflen(&nbr->packethandle); memcpy(UIP_IP_BUF, uip_packetqueue_buf(&nbr->packethandle), uip_len); uip_packetqueue_free(&nbr->packethandle); tcpip_output(uip_ds6_nbr_get_ll(nbr)); } #endif /*UIP_CONF_IPV6_QUEUE_PKT*/ uip_clear_buf(); return; } } /* Multicast IP destination address. */ tcpip_output(NULL); uip_clear_buf(); }
/* * Process a Router Advertisement * * - Possible actions when receiving a RA: add router to router list, * recalculate reachable time, update link hop limit, update retrans timer. * - If MTU option: update MTU. * - If SLLAO option: update entry in neighbor cache * - If prefix option: start autoconf, add prefix to prefix list */ void ra_input(void) { PRINTF("Received RA from"); PRINT6ADDR(&UIP_IP_BUF->srcipaddr); PRINTF("to"); PRINT6ADDR(&UIP_IP_BUF->destipaddr); PRINTF("\n"); UIP_STAT(++uip_stat.nd6.recv); #if UIP_CONF_IPV6_CHECKS if((UIP_IP_BUF->ttl != UIP_ND6_HOP_LIMIT) || (!uip_is_addr_link_local(&UIP_IP_BUF->srcipaddr)) || (UIP_ICMP_BUF->icode != 0)) { PRINTF("RA received is bad"); goto discard; } #endif /*UIP_CONF_IPV6_CHECKS */ if(UIP_ND6_RA_BUF->cur_ttl != 0) { uip_ds6_if.cur_hop_limit = UIP_ND6_RA_BUF->cur_ttl; PRINTF("uip_ds6_if.cur_hop_limit %u\n", uip_ds6_if.cur_hop_limit); } if(UIP_ND6_RA_BUF->reachable_time != 0) { if(uip_ds6_if.base_reachable_time != uip_ntohl(UIP_ND6_RA_BUF->reachable_time)) { uip_ds6_if.base_reachable_time = uip_ntohl(UIP_ND6_RA_BUF->reachable_time); uip_ds6_if.reachable_time = uip_ds6_compute_reachable_time(); } } if(UIP_ND6_RA_BUF->retrans_timer != 0) { uip_ds6_if.retrans_timer = uip_ntohl(UIP_ND6_RA_BUF->retrans_timer); } /* Options processing */ nd6_opt_offset = UIP_ND6_RA_LEN; while(uip_l3_icmp_hdr_len + nd6_opt_offset < uip_len) { if(UIP_ND6_OPT_HDR_BUF->len == 0) { PRINTF("RA received is bad"); goto discard; } switch (UIP_ND6_OPT_HDR_BUF->type) { case UIP_ND6_OPT_SLLAO: PRINTF("Processing SLLAO option in RA\n"); nd6_opt_llao = (uint8_t *) UIP_ND6_OPT_HDR_BUF; nbr = uip_ds6_nbr_lookup(&UIP_IP_BUF->srcipaddr); if(nbr == NULL) { nbr = uip_ds6_nbr_add(&UIP_IP_BUF->srcipaddr, (uip_lladdr_t *)&nd6_opt_llao[UIP_ND6_OPT_DATA_OFFSET], 1, NBR_STALE); } else { uip_lladdr_t *lladdr = uip_ds6_nbr_get_ll(nbr); if(nbr->state == NBR_INCOMPLETE) { nbr->state = NBR_STALE; } if(memcmp(&nd6_opt_llao[UIP_ND6_OPT_DATA_OFFSET], lladdr, UIP_LLADDR_LEN) != 0) { memcpy(lladdr, &nd6_opt_llao[UIP_ND6_OPT_DATA_OFFSET], UIP_LLADDR_LEN); nbr->state = NBR_STALE; } nbr->isrouter = 1; } break; case UIP_ND6_OPT_MTU: PRINTF("Processing MTU option in RA\n"); uip_ds6_if.link_mtu = uip_ntohl(((uip_nd6_opt_mtu *) UIP_ND6_OPT_HDR_BUF)->mtu); break; case UIP_ND6_OPT_PREFIX_INFO: PRINTF("Processing PREFIX option in RA\n"); nd6_opt_prefix_info = (uip_nd6_opt_prefix_info *) UIP_ND6_OPT_HDR_BUF; if((uip_ntohl(nd6_opt_prefix_info->validlt) >= uip_ntohl(nd6_opt_prefix_info->preferredlt)) && (!uip_is_addr_link_local(&nd6_opt_prefix_info->prefix))) { /* on-link flag related processing */ if(nd6_opt_prefix_info->flagsreserved1 & UIP_ND6_RA_FLAG_ONLINK) { prefix = uip_ds6_prefix_lookup(&nd6_opt_prefix_info->prefix, nd6_opt_prefix_info->preflen); if(prefix == NULL) { if(nd6_opt_prefix_info->validlt != 0) { if(nd6_opt_prefix_info->validlt != UIP_ND6_INFINITE_LIFETIME) { prefix = uip_ds6_prefix_add(&nd6_opt_prefix_info->prefix, nd6_opt_prefix_info->preflen, uip_ntohl(nd6_opt_prefix_info-> validlt)); } else { prefix = uip_ds6_prefix_add(&nd6_opt_prefix_info->prefix, nd6_opt_prefix_info->preflen, 0); } } } else { switch (nd6_opt_prefix_info->validlt) { case 0: uip_ds6_prefix_rm(prefix); break; case UIP_ND6_INFINITE_LIFETIME: prefix->isinfinite = 1; break; default: PRINTF("Updating timer of prefix"); PRINT6ADDR(&prefix->ipaddr); PRINTF("new value %lu\n", uip_ntohl(nd6_opt_prefix_info->validlt)); stimer_set(&prefix->vlifetime, uip_ntohl(nd6_opt_prefix_info->validlt)); prefix->isinfinite = 0; break; } } } /* End of on-link flag related processing */ /* autonomous flag related processing */ if((nd6_opt_prefix_info->flagsreserved1 & UIP_ND6_RA_FLAG_AUTONOMOUS) && (nd6_opt_prefix_info->validlt != 0) && (nd6_opt_prefix_info->preflen == UIP_DEFAULT_PREFIX_LEN)) { uip_ipaddr_copy(&ipaddr, &nd6_opt_prefix_info->prefix); uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr); addr = uip_ds6_addr_lookup(&ipaddr); if((addr != NULL) && (addr->type == ADDR_AUTOCONF)) { if(nd6_opt_prefix_info->validlt != UIP_ND6_INFINITE_LIFETIME) { /* The processing below is defined in RFC4862 section 5.5.3 e */ if((uip_ntohl(nd6_opt_prefix_info->validlt) > 2 * 60 * 60) || (uip_ntohl(nd6_opt_prefix_info->validlt) > stimer_remaining(&addr->vlifetime))) { PRINTF("Updating timer of address"); PRINT6ADDR(&addr->ipaddr); PRINTF("new value %lu\n", uip_ntohl(nd6_opt_prefix_info->validlt)); stimer_set(&addr->vlifetime, uip_ntohl(nd6_opt_prefix_info->validlt)); } else { stimer_set(&addr->vlifetime, 2 * 60 * 60); PRINTF("Updating timer of address "); PRINT6ADDR(&addr->ipaddr); PRINTF("new value %lu\n", (unsigned long)(2 * 60 * 60)); } addr->isinfinite = 0; } else { addr->isinfinite = 1; } } else { if(uip_ntohl(nd6_opt_prefix_info->validlt) == UIP_ND6_INFINITE_LIFETIME) { uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF); } else { uip_ds6_addr_add(&ipaddr, uip_ntohl(nd6_opt_prefix_info->validlt), ADDR_AUTOCONF); } } } /* End of autonomous flag related processing */ } break; default: PRINTF("ND option not supported in RA"); break; } nd6_opt_offset += (UIP_ND6_OPT_HDR_BUF->len << 3); } defrt = uip_ds6_defrt_lookup(&UIP_IP_BUF->srcipaddr); if(UIP_ND6_RA_BUF->router_lifetime != 0) { if(nbr != NULL) { nbr->isrouter = 1; } if(defrt == NULL) { uip_ds6_defrt_add(&UIP_IP_BUF->srcipaddr, (unsigned long)(uip_ntohs(UIP_ND6_RA_BUF->router_lifetime))); } else { stimer_set(&(defrt->lifetime), (unsigned long)(uip_ntohs(UIP_ND6_RA_BUF->router_lifetime))); } } else { if(defrt != NULL) { uip_ds6_defrt_rm(defrt); } } #if UIP_CONF_IPV6_QUEUE_PKT /* If the nbr just became reachable (e.g. it was in NBR_INCOMPLETE state * and we got a SLLAO), check if we had buffered a pkt for it */ /* if((nbr != NULL) && (nbr->queue_buf_len != 0)) { uip_len = nbr->queue_buf_len; memcpy(UIP_IP_BUF, nbr->queue_buf, uip_len); nbr->queue_buf_len = 0; return; }*/ if(nbr != NULL && uip_packetqueue_buflen(&nbr->packethandle) != 0) { uip_len = uip_packetqueue_buflen(&nbr->packethandle); memcpy(UIP_IP_BUF, uip_packetqueue_buf(&nbr->packethandle), uip_len); uip_packetqueue_free(&nbr->packethandle); return; } #endif /*UIP_CONF_IPV6_QUEUE_PKT */ discard: uip_len = 0; return; }
/** * Neighbor Advertisement Processing * * we might have to send a pkt that had been buffered while address * resolution was performed (if we support buffering, see UIP_CONF_QUEUE_PKT) * * As per RFC 4861, on link layer that have addresses, TLLAO options MUST be * included when responding to multicast solicitations, SHOULD be included in * response to unicast (here we assume it is for now) * * NA can be received after sending NS for DAD, Address resolution or NUD. Can * be unsolicited as well. * It can trigger update of the state of the neighbor in the neighbor cache, * router in the router list. * If the NS was for DAD, it means DAD failed * */ static void na_input(void) { uint8_t is_llchange; uint8_t is_router; uint8_t is_solicited; uint8_t is_override; uip_lladdr_t lladdr_aligned; PRINTF("Received NA from "); PRINT6ADDR(&UIP_IP_BUF->srcipaddr); PRINTF(" to "); PRINT6ADDR(&UIP_IP_BUF->destipaddr); PRINTF(" with target address "); PRINT6ADDR((uip_ipaddr_t *) (&UIP_ND6_NA_BUF->tgtipaddr)); PRINTF("\n"); UIP_STAT(++uip_stat.nd6.recv); /* * booleans. the three last one are not 0 or 1 but 0 or 0x80, 0x40, 0x20 * but it works. Be careful though, do not use tests such as is_router == 1 */ is_llchange = 0; is_router = ((UIP_ND6_NA_BUF->flagsreserved & UIP_ND6_NA_FLAG_ROUTER)); is_solicited = ((UIP_ND6_NA_BUF->flagsreserved & UIP_ND6_NA_FLAG_SOLICITED)); is_override = ((UIP_ND6_NA_BUF->flagsreserved & UIP_ND6_NA_FLAG_OVERRIDE)); #if UIP_CONF_IPV6_CHECKS if((UIP_IP_BUF->ttl != UIP_ND6_HOP_LIMIT) || (UIP_ICMP_BUF->icode != 0) || (uip_is_addr_mcast(&UIP_ND6_NA_BUF->tgtipaddr)) || (is_solicited && uip_is_addr_mcast(&UIP_IP_BUF->destipaddr))) { PRINTF("NA received is bad\n"); goto discard; } #endif /*UIP_CONF_IPV6_CHECKS */ /* Options processing: we handle TLLAO, and must ignore others */ nd6_opt_offset = UIP_ND6_NA_LEN; nd6_opt_llao = NULL; while(uip_l3_icmp_hdr_len + nd6_opt_offset < uip_len) { #if UIP_CONF_IPV6_CHECKS if(UIP_ND6_OPT_HDR_BUF->len == 0) { PRINTF("NA received is bad\n"); goto discard; } #endif /*UIP_CONF_IPV6_CHECKS */ switch (UIP_ND6_OPT_HDR_BUF->type) { case UIP_ND6_OPT_TLLAO: nd6_opt_llao = (uint8_t *)UIP_ND6_OPT_HDR_BUF; break; default: PRINTF("ND option not supported in NA\n"); break; } nd6_opt_offset += (UIP_ND6_OPT_HDR_BUF->len << 3); } addr = uip_ds6_addr_lookup(&UIP_ND6_NA_BUF->tgtipaddr); /* Message processing, including TLLAO if any */ if(addr != NULL) { #if UIP_ND6_DEF_MAXDADNS > 0 if(addr->state == ADDR_TENTATIVE) { uip_ds6_dad_failed(addr); } #endif /*UIP_ND6_DEF_MAXDADNS > 0 */ PRINTF("NA received is bad\n"); goto discard; } else { const uip_lladdr_t *lladdr; nbr = uip_ds6_nbr_lookup(&UIP_ND6_NA_BUF->tgtipaddr); if(nbr == NULL) { goto discard; } lladdr = uip_ds6_nbr_get_ll(nbr); if(lladdr == NULL) { goto discard; } if(nd6_opt_llao != NULL) { is_llchange = memcmp(&nd6_opt_llao[UIP_ND6_OPT_DATA_OFFSET], lladdr, UIP_LLADDR_LEN); } if(nbr->state == NBR_INCOMPLETE) { if(nd6_opt_llao == NULL || !extract_lladdr_from_llao_aligned(&lladdr_aligned)) { goto discard; } if(nbr_table_update_lladdr((const linkaddr_t *)lladdr, (const linkaddr_t *)&lladdr_aligned, 1) == 0) { /* failed to update the lladdr */ goto discard; } /* Note: No need to refresh the state of the nbr here. * It has already been refreshed upon receiving the unicast IPv6 ND packet. * See: uip_ds6_nbr_refresh_reachable_state() */ if(!is_solicited) { nbr->state = NBR_STALE; } nbr->isrouter = is_router; } else { /* NBR is not INCOMPLETE */ if(!is_override && is_llchange) { if(nbr->state == NBR_REACHABLE) { nbr->state = NBR_STALE; } goto discard; } else { /** * If this is an cache override, or same lladdr, or no llao - * do updates of nbr states. */ if(is_override || !is_llchange || nd6_opt_llao == NULL) { if(nd6_opt_llao != NULL && is_llchange) { if(!extract_lladdr_from_llao_aligned(&lladdr_aligned) || nbr_table_update_lladdr((const linkaddr_t *) lladdr, (const linkaddr_t *) &lladdr_aligned, 1) == 0) { /* failed to update the lladdr */ goto discard; } } /* Note: No need to refresh the state of the nbr here. * It has already been refreshed upon receiving the unicast IPv6 ND packet. * See: uip_ds6_nbr_refresh_reachable_state() */ } } if(nbr->isrouter && !is_router) { defrt = uip_ds6_defrt_lookup(&UIP_IP_BUF->srcipaddr); if(defrt != NULL) { uip_ds6_defrt_rm(defrt); } } nbr->isrouter = is_router; } } #if UIP_CONF_IPV6_QUEUE_PKT /* The nbr is now reachable, check if we had buffered a pkt for it */ /*if(nbr->queue_buf_len != 0) { uip_len = nbr->queue_buf_len; memcpy(UIP_IP_BUF, nbr->queue_buf, uip_len); nbr->queue_buf_len = 0; return; }*/ if(uip_packetqueue_buflen(&nbr->packethandle) != 0) { uip_len = uip_packetqueue_buflen(&nbr->packethandle); memcpy(UIP_IP_BUF, uip_packetqueue_buf(&nbr->packethandle), uip_len); uip_packetqueue_free(&nbr->packethandle); return; } #endif /*UIP_CONF_IPV6_QUEUE_PKT */ discard: uip_clear_buf(); return; }
void tcpip_ipv6_output(void) { static uip_ds6_nbr_t *nbr = NULL; static uip_ipaddr_t* nexthop; if(uip_len == 0) { return; } if(uip_len > UIP_LINK_MTU) { UIP_LOG("tcpip_ipv6_output: Packet to big"); uip_len = 0; return; } if(uip_is_addr_unspecified(&UIP_IP_BUF->destipaddr)) { UIP_LOG("tcpip_ipv6_output: Destination address unspecified"); uip_len = 0; return; } if(!uip_is_addr_mcast(&UIP_IP_BUF->destipaddr)) { /* Next hop determination */ nbr = NULL; if(uip_ds6_is_addr_onlink(&UIP_IP_BUF->destipaddr)) { nexthop = &UIP_IP_BUF->destipaddr; } else { uip_ds6_route_t* locrt; locrt = uip_ds6_route_lookup(&UIP_IP_BUF->destipaddr); if(locrt == NULL) { if((nexthop = uip_ds6_defrt_choose()) == NULL) { #ifdef UIP_FALLBACK_INTERFACE UIP_FALLBACK_INTERFACE.output(); #else PRINTF("tcpip_ipv6_output: Destination off-link but no route\n"); #endif uip_len = 0; return; } } else { nexthop = &locrt->nexthop; } } /* end of next hop determination */ if((nbr = uip_ds6_nbr_lookup(nexthop)) == NULL) { // printf("add1 %d\n", nexthop->u8[15]); if((nbr = uip_ds6_nbr_add(nexthop, NULL, 0, NBR_INCOMPLETE)) == NULL) { // printf("add n\n"); uip_len = 0; return; } else { #if UIP_CONF_IPV6_QUEUE_PKT /* copy outgoing pkt in the queuing buffer for later transmmit */ if(uip_packetqueue_alloc(&nbr->packethandle, UIP_DS6_NBR_PACKET_LIFETIME) != NULL) { memcpy(uip_packetqueue_buf(&nbr->packethandle), UIP_IP_BUF, uip_len); uip_packetqueue_set_buflen(&nbr->packethandle, uip_len); } #endif /* RFC4861, 7.2.2: * "If the source address of the packet prompting the solicitation is the * same as one of the addresses assigned to the outgoing interface, that * address SHOULD be placed in the IP Source Address of the outgoing * solicitation. Otherwise, any one of the addresses assigned to the * interface should be used."*/ if(uip_ds6_is_my_addr(&UIP_IP_BUF->srcipaddr)) { uip_nd6_ns_output(&UIP_IP_BUF->srcipaddr, NULL, &nbr->ipaddr); } else { uip_nd6_ns_output(NULL, NULL, &nbr->ipaddr); } stimer_set(&(nbr->sendns), uip_ds6_if.retrans_timer / 1000); nbr->nscount = 1; } } else { if(nbr->state == NBR_INCOMPLETE) { PRINTF("tcpip_ipv6_output: nbr cache entry incomplete\n"); #if UIP_CONF_IPV6_QUEUE_PKT /* copy outgoing pkt in the queuing buffer for later transmmit and set the destination nbr to nbr */ if(uip_packetqueue_alloc(&nbr->packethandle, UIP_DS6_NBR_PACKET_LIFETIME) != NULL) { memcpy(uip_packetqueue_buf(&nbr->packethandle), UIP_IP_BUF, uip_len); uip_packetqueue_set_buflen(&nbr->packethandle, uip_len); } /* memcpy(nbr->queue_buf, UIP_IP_BUF, uip_len); nbr->queue_buf_len = uip_len;*/ uip_len = 0; #endif /*UIP_CONF_IPV6_QUEUE_PKT*/ return; } /* if running NUD (nbc->state == STALE, DELAY, or PROBE ) keep sending in parallel see rfc 4861 Node behavior in section 7.7.3*/ if(nbr->state == NBR_STALE) { nbr->state = NBR_DELAY; stimer_set(&(nbr->reachable), UIP_ND6_DELAY_FIRST_PROBE_TIME); nbr->nscount = 0; PRINTF("tcpip_ipv6_output: nbr cache entry stale moving to delay\n"); } stimer_set(&(nbr->sendns), uip_ds6_if.retrans_timer / 1000); tcpip_output(&(nbr->lladdr)); #if UIP_CONF_IPV6_QUEUE_PKT /* Send the queued packets from here, may not be 100% perfect though. * This happens in a few cases, for example when instead of receiving a * NA after sendiong a NS, you receive a NS with SLLAO: the entry moves *to STALE, and you must both send a NA and the queued packet */ /* if(nbr->queue_buf_len != 0) { uip_len = nbr->queue_buf_len; memcpy(UIP_IP_BUF, nbr->queue_buf, uip_len); nbr->queue_buf_len = 0; tcpip_output(&(nbr->lladdr)); }*/ if(uip_packetqueue_buflen(&nbr->packethandle) != 0) { uip_len = uip_packetqueue_buflen(&nbr->packethandle); memcpy(UIP_IP_BUF, uip_packetqueue_buf(&nbr->packethandle), uip_len); uip_packetqueue_free(&nbr->packethandle); tcpip_output(&(nbr->lladdr)); } #endif /*UIP_CONF_IPV6_QUEUE_PKT*/ uip_len = 0; return; } } /*multicast IP destination address */ tcpip_output(NULL); uip_len = 0; uip_ext_len = 0; }