rpl_parent_t *rpl_find_preferred_parent(void) { rpl_parent_t *best = NULL; rpl_dodag_t *my_dodag = rpl_get_my_dodag(); if (my_dodag == NULL) { DEBUG("Not part of a dodag\n"); return NULL; } for (uint8_t i = 0; i < RPL_MAX_PARENTS; i++) { if (parents[i].used) { if ((parents[i].rank == INFINITE_RANK) || (parents[i].lifetime <= 1)) { DEBUG("Infinite rank, bad parent\n"); continue; } else if (best == NULL) { DEBUG("possible parent\n"); best = &parents[i]; } else { best = my_dodag->of->which_parent(best, &parents[i]); } } } if (best == NULL) { return NULL; } if (my_dodag->my_preferred_parent == NULL) { my_dodag->my_preferred_parent = best; } if (!rpl_equal_id(&my_dodag->my_preferred_parent->addr, &best->addr)) { if (my_dodag->mop != NO_DOWNWARD_ROUTES) { /* send DAO with ZERO_LIFETIME to old parent */ send_DAO(&my_dodag->my_preferred_parent->addr, 0, false, 0); } my_dodag->my_preferred_parent = best; if (my_dodag->mop != NO_DOWNWARD_ROUTES) { delay_dao(); } reset_trickletimer(); } return best; }
void dao_delay_over(void) { while (1) { thread_sleep(); if ((ack_received == false) && (dao_counter < DAO_SEND_RETRIES)) { dao_counter++; send_DAO(NULL, 0, true, 0); dao_time = timex_set(DEFAULT_WAIT_FOR_DAO_ACK, 0); vtimer_remove(&dao_timer); vtimer_set_wakeup(&dao_timer, dao_time, dao_delay_over_pid); } else if (ack_received == false) { long_delay_dao(); } } }
void send_DAO(ipv6_addr_t *destination, uint8_t lifetime, bool default_lifetime, uint8_t start_index) { if (i_am_root) { return; } mutex_lock(&rpl_send_mutex); rpl_dodag_t *my_dodag; my_dodag = rpl_get_my_dodag(); if (destination == NULL) { destination = &my_dodag->my_preferred_parent->addr; } if (default_lifetime) { lifetime = my_dodag->default_lifetime; } icmp_send_buf = get_rpl_send_icmpv6_buf(ipv6_ext_hdr_len); icmp_send_buf->type = ICMPV6_TYPE_RPL_CONTROL; icmp_send_buf->code = ICMP_CODE_DAO; icmp_send_buf->checksum = ~icmpv6_csum(IPV6_PROTO_NUM_ICMPV6); if (my_dodag == NULL) { mutex_unlock(&rpl_send_mutex); return; } rpl_send_dao_buf = get_rpl_send_dao_buf(); memset(rpl_send_dao_buf, 0, sizeof(*rpl_send_dao_buf)); rpl_send_dao_buf->rpl_instanceid = my_dodag->instance->id; rpl_send_dao_buf->k_d_flags = 0x00; rpl_send_dao_buf->dao_sequence = my_dodag->dao_seq; uint16_t opt_len = 0; rpl_send_opt_target_buf = get_rpl_send_opt_target_buf(DAO_BASE_LEN); /* add all targets from routing table as targets */ uint8_t entries = 0; uint8_t continue_index = 0; for (uint8_t i = start_index; i < RPL_MAX_ROUTING_ENTRIES; i++) { if (routing_table[i].used) { rpl_send_opt_target_buf->type = RPL_OPT_TARGET; rpl_send_opt_target_buf->length = RPL_OPT_TARGET_LEN; rpl_send_opt_target_buf->flags = 0x00; rpl_send_opt_target_buf->prefix_length = RPL_DODAG_ID_LEN; memcpy(&rpl_send_opt_target_buf->target, &routing_table[i].address, sizeof(ipv6_addr_t)); opt_len += RPL_OPT_TARGET_LEN + 2; rpl_send_opt_transit_buf = get_rpl_send_opt_transit_buf(DAO_BASE_LEN + opt_len); rpl_send_opt_transit_buf->type = RPL_OPT_TRANSIT; rpl_send_opt_transit_buf->length = RPL_OPT_TRANSIT_LEN; rpl_send_opt_transit_buf->e_flags = 0x00; rpl_send_opt_transit_buf->path_control = 0x00; /* not used */ rpl_send_opt_transit_buf->path_sequence = 0x00; /* not used */ rpl_send_opt_transit_buf->path_lifetime = lifetime; opt_len += RPL_OPT_TRANSIT_LEN + 2; rpl_send_opt_target_buf = get_rpl_send_opt_target_buf(DAO_BASE_LEN + opt_len); entries++; } /* Split DAO, so packages don't get too big. * The value 5 is based on experience. */ if (entries >= 5) { continue_index = i + 1; break; } } /* add own address */ rpl_send_opt_target_buf->type = RPL_OPT_TARGET; rpl_send_opt_target_buf->length = RPL_OPT_TARGET_LEN; rpl_send_opt_target_buf->flags = 0x00; rpl_send_opt_target_buf->prefix_length = RPL_DODAG_ID_LEN; memcpy(&rpl_send_opt_target_buf->target, &my_address, sizeof(ipv6_addr_t)); opt_len += RPL_OPT_TARGET_LEN + 2; rpl_send_opt_transit_buf = get_rpl_send_opt_transit_buf(DAO_BASE_LEN + opt_len); rpl_send_opt_transit_buf->type = RPL_OPT_TRANSIT; rpl_send_opt_transit_buf->length = RPL_OPT_TRANSIT_LEN; rpl_send_opt_transit_buf->e_flags = 0x00; rpl_send_opt_transit_buf->path_control = 0x00; rpl_send_opt_transit_buf->path_sequence = 0x00; rpl_send_opt_transit_buf->path_lifetime = lifetime; opt_len += RPL_OPT_TRANSIT_LEN + 2; uint16_t plen = ICMPV6_HDR_LEN + DAO_BASE_LEN + opt_len; rpl_send(destination, (uint8_t *)icmp_send_buf, plen, IPV6_PROTO_NUM_ICMPV6, NULL); mutex_unlock(&rpl_send_mutex); if (continue_index > 1) { send_DAO(destination, lifetime, default_lifetime, continue_index); } }