/* ip.access nanoBTS specific code */ /* (C) 2009-2018 by Harald Welte * * All Rights Reserved * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as published by * the Free Software Foundation; either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see . * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int bts_model_nanobts_start(struct gsm_network *net); static void bts_model_nanobts_e1line_bind_ops(struct e1inp_line *line); static char *get_oml_status(const struct gsm_bts *bts) { if (bts->oml_link) return all_trx_rsl_connected_unlocked(bts) ? "connected" : "degraded"; return "disconnected"; } struct gsm_bts_model bts_model_nanobts = { .type = GSM_BTS_TYPE_NANOBTS, .name = "nanobts", .start = bts_model_nanobts_start, .oml_rcvmsg = &abis_nm_rcvmsg, .oml_status = &get_oml_status, .e1line_bind_ops = bts_model_nanobts_e1line_bind_ops, /* Some nanoBTS firmwares (if not all) don't support SI2ter and cause * problems on some MS if it is enabled, see OS#3063. Disable it by * default, can still be enabled through VTY cmd with same name. */ .force_combined_si = true, .nm_att_tlvdef = { .def = { /* ip.access specifics */ [NM_ATT_IPACC_DST_IP] = { TLV_TYPE_FIXED, 4 }, [NM_ATT_IPACC_DST_IP_PORT] = { TLV_TYPE_FIXED, 2 }, [NM_ATT_IPACC_STREAM_ID] = { TLV_TYPE_TV, }, [NM_ATT_IPACC_SEC_OML_CFG] = { TLV_TYPE_FIXED, 6 }, [NM_ATT_IPACC_IP_IF_CFG] = { TLV_TYPE_FIXED, 8 }, [NM_ATT_IPACC_IP_GW_CFG] = { TLV_TYPE_FIXED, 12 }, [NM_ATT_IPACC_IN_SERV_TIME] = { TLV_TYPE_FIXED, 4 }, [NM_ATT_IPACC_LOCATION] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_PAGING_CFG] = { TLV_TYPE_FIXED, 2 }, [NM_ATT_IPACC_UNIT_ID] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_UNIT_NAME] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_SNMP_CFG] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_PRIM_OML_CFG_LIST] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_NV_FLAGS] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_FREQ_CTRL] = { TLV_TYPE_FIXED, 2 }, [NM_ATT_IPACC_PRIM_OML_FB_TOUT] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_CUR_SW_CFG] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_TIMING_BUS] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_CGI] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_RAC] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_OBJ_VERSION] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_GPRS_PAGING_CFG]= { TLV_TYPE_TL16V }, [NM_ATT_IPACC_NSEI] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_BVCI] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_NSVCI] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_NS_CFG] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_BSSGP_CFG] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_NS_LINK_CFG] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_RLC_CFG] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_ALM_THRESH_LIST]= { TLV_TYPE_TL16V }, [NM_ATT_IPACC_MONIT_VAL_LIST] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_TIB_CONTROL] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_SUPP_FEATURES] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_CODING_SCHEMES] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_RLC_CFG_2] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_HEARTB_TOUT] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_UPTIME] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_RLC_CFG_3] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_SSL_CFG] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_SEC_POSSIBLE] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_IML_SSL_STATE] = { TLV_TYPE_TL16V }, [NM_ATT_IPACC_REVOC_DATE] = { TLV_TYPE_TL16V }, }, }, }; /* Callback function to be called whenever we get a GSM 12.21 state change event */ static int nm_statechg_event(int evt, struct nm_statechg_signal_data *nsd) { uint8_t obj_class = nsd->obj_class; void *obj = nsd->obj; struct gsm_nm_state *new_state = nsd->new_state; struct gsm_bts *bts; struct gsm_bts_trx *trx; struct gsm_bts_trx_ts *ts; struct gsm_bts_gprs_nsvc *nsvc; struct msgb *msgb; if (!is_ipaccess_bts(nsd->bts)) return 0; /* This event-driven BTS setup is currently only required on nanoBTS */ /* S_NM_STATECHG_ADM is called after we call chg_adm_state() and would create * endless loop */ if (evt != S_NM_STATECHG_OPER) return 0; switch (obj_class) { case NM_OC_SITE_MANAGER: bts = container_of(obj, struct gsm_bts, site_mgr); if ((new_state->operational == NM_OPSTATE_ENABLED && new_state->availability == NM_AVSTATE_OK) || (new_state->operational == NM_OPSTATE_DISABLED && new_state->availability == NM_AVSTATE_OFF_LINE)) abis_nm_opstart(bts, obj_class, 0xff, 0xff, 0xff); break; case NM_OC_BTS: bts = obj; if (new_state->availability == NM_AVSTATE_DEPENDENCY) { msgb = nanobts_attr_bts_get(bts); abis_nm_set_bts_attr(bts, msgb->data, msgb->len); msgb_free(msgb); abis_nm_chg_adm_state(bts, obj_class, bts->bts_nr, 0xff, 0xff, NM_STATE_UNLOCKED); abis_nm_opstart(bts, obj_class, bts->bts_nr, 0xff, 0xff); } break; case NM_OC_CHANNEL: ts = obj; trx = ts->trx; if (new_state->operational == NM_OPSTATE_DISABLED && new_state->availability == NM_AVSTATE_DEPENDENCY) { enum abis_nm_chan_comb ccomb = abis_nm_chcomb4pchan(ts->pchan_from_config); if (abis_nm_set_channel_attr(ts, ccomb) == -EINVAL) { ipaccess_drop_oml_deferred(trx->bts); return -1; } abis_nm_chg_adm_state(trx->bts, obj_class, trx->bts->bts_nr, trx->nr, ts->nr, NM_STATE_UNLOCKED); abis_nm_opstart(trx->bts, obj_class, trx->bts->bts_nr, trx->nr, ts->nr); } break; case NM_OC_RADIO_CARRIER: trx = obj; if (new_state->operational == NM_OPSTATE_DISABLED && new_state->availability == NM_AVSTATE_OK) abis_nm_opstart(trx->bts, obj_class, trx->bts->bts_nr, trx->nr, 0xff); break; case NM_OC_GPRS_NSE: bts = container_of(obj, struct gsm_bts, gprs.nse); if (bts->gprs.mode == BTS_GPRS_NONE) break; if (new_state->availability == NM_AVSTATE_DEPENDENCY) { msgb = nanobts_attr_nse_get(bts); abis_nm_ipaccess_set_attr(bts, obj_class, bts->bts_nr, 0xff, 0xff, msgb->data, msgb->len); msgb_free(msgb); abis_nm_opstart(bts, obj_class, bts->bts_nr, 0xff, 0xff); } break; case NM_OC_GPRS_CELL: bts = container_of(obj, struct gsm_bts, gprs.cell); if (bts->gprs.mode == BTS_GPRS_NONE) break; if (new_state->availability == NM_AVSTATE_DEPENDENCY) { msgb = nanobts_attr_cell_get(bts); abis_nm_ipaccess_set_attr(bts, obj_class, bts->bts_nr, 0, 0xff, msgb->data, msgb->len); msgb_free(msgb); abis_nm_opstart(bts, obj_class, bts->bts_nr, 0, 0xff); abis_nm_chg_adm_state(bts, obj_class, bts->bts_nr, 0, 0xff, NM_STATE_UNLOCKED); abis_nm_chg_adm_state(bts, NM_OC_GPRS_NSE, bts->bts_nr, 0xff, 0xff, NM_STATE_UNLOCKED); } break; case NM_OC_GPRS_NSVC: nsvc = obj; bts = nsvc->bts; if (bts->gprs.mode == BTS_GPRS_NONE) break; /* We skip NSVC1 since we only use NSVC0 */ if (nsvc->id == 1) break; if ((new_state->availability == NM_AVSTATE_OFF_LINE) || (new_state->availability == NM_AVSTATE_DEPENDENCY)) { msgb = nanobts_attr_nscv_get(bts); abis_nm_ipaccess_set_attr(bts, obj_class, bts->bts_nr, nsvc->id, 0xff, msgb->data, msgb->len); msgb_free(msgb); abis_nm_opstart(bts, obj_class, bts->bts_nr, nsvc->id, 0xff); abis_nm_chg_adm_state(bts, obj_class, bts->bts_nr, nsvc->id, 0xff, NM_STATE_UNLOCKED); } default: break; } return 0; } /* Callback function to be called every time we receive a 12.21 SW activated report */ static int sw_activ_rep(struct msgb *mb) { struct abis_om_fom_hdr *foh = msgb_l3(mb); struct e1inp_sign_link *sign_link = mb->dst; struct gsm_bts *bts = sign_link->trx->bts; struct gsm_bts_trx *trx = gsm_bts_trx_num(bts, foh->obj_inst.trx_nr); if (!trx) return -EINVAL; if (!is_ipaccess_bts(trx->bts)) return 0; switch (foh->obj_class) { case NM_OC_BASEB_TRANSC: abis_nm_chg_adm_state(trx->bts, foh->obj_class, trx->bts->bts_nr, trx->nr, 0xff, NM_STATE_UNLOCKED); abis_nm_opstart(trx->bts, foh->obj_class, trx->bts->bts_nr, trx->nr, 0xff); /* TRX software is active, tell it to initiate RSL Link */ abis_nm_ipaccess_rsl_connect(trx, trx->bts->ip_access.rsl_ip, 3003, trx->rsl_tei); break; case NM_OC_RADIO_CARRIER: { /* * Locking the radio carrier will make it go * offline again and we would come here. The * framework should determine that there was * no change and avoid recursion. * * This code is here to make sure that on start * a TRX remains locked. */ int rc_state = trx->mo.nm_state.administrative; /* Patch ARFCN into radio attribute */ struct msgb *msgb = nanobts_attr_radio_get(trx->bts, trx); abis_nm_set_radio_attr(trx, msgb->data, msgb->len); msgb_free(msgb); abis_nm_chg_adm_state(trx->bts, foh->obj_class, trx->bts->bts_nr, trx->nr, 0xff, rc_state); abis_nm_opstart(trx->bts, foh->obj_class, trx->bts->bts_nr, trx->nr, 0xff); break; } } return 0; } static void nm_rx_opstart_ack_chan(struct msgb *oml_msg) { struct gsm_bts_trx_ts *ts; ts = abis_nm_get_ts(oml_msg); if (!ts) /* error already logged in abis_nm_get_ts() */ return; if (!ts->fi) { LOG_TS(ts, LOGL_ERROR, "Channel OPSTART ACK for uninitialized TS\n"); return; } osmo_fsm_inst_dispatch(ts->fi, TS_EV_OML_READY, NULL); } static void nm_rx_opstart_ack(struct msgb *oml_msg) { struct abis_om_fom_hdr *foh = msgb_l3(oml_msg); switch (foh->obj_class) { case NM_OC_CHANNEL: nm_rx_opstart_ack_chan(oml_msg); break; default: break; } } /* Callback function to be called every time we receive a signal from NM */ static int bts_ipa_nm_sig_cb(unsigned int subsys, unsigned int signal, void *handler_data, void *signal_data) { if (subsys != SS_NM) return 0; switch (signal) { case S_NM_SW_ACTIV_REP: return sw_activ_rep(signal_data); case S_NM_STATECHG_OPER: case S_NM_STATECHG_ADM: return nm_statechg_event(signal, signal_data); case S_NM_OPSTART_ACK: nm_rx_opstart_ack(signal_data); return 0; default: break; } return 0; } static int bts_model_nanobts_start(struct gsm_network *net) { osmo_signal_unregister_handler(SS_NM, bts_ipa_nm_sig_cb, NULL); osmo_signal_register_handler(SS_NM, bts_ipa_nm_sig_cb, NULL); return 0; } int bts_model_nanobts_init(void) { bts_model_nanobts.features.data = &bts_model_nanobts._features_data[0]; bts_model_nanobts.features.data_len = sizeof(bts_model_nanobts._features_data); osmo_bts_set_feature(&bts_model_nanobts.features, BTS_FEAT_GPRS); osmo_bts_set_feature(&bts_model_nanobts.features, BTS_FEAT_EGPRS); osmo_bts_set_feature(&bts_model_nanobts.features, BTS_FEAT_MULTI_TSC); return gsm_bts_model_register(&bts_model_nanobts); } #define OML_UP 0x0001 #define RSL_UP 0x0002 static struct gsm_bts * find_bts_by_unitid(struct gsm_network *net, uint16_t site_id, uint16_t bts_id) { struct gsm_bts *bts; llist_for_each_entry(bts, &net->bts_list, list) { if (!is_ipaccess_bts(bts)) continue; if (bts->ip_access.site_id == site_id && bts->ip_access.bts_id == bts_id) return bts; } return NULL; } /* These are exported because they are used by the VTY interface. */ void ipaccess_drop_rsl(struct gsm_bts_trx *trx, const char *reason) { if (!trx->rsl_link) return; LOG_TRX(trx, DLINP, LOGL_NOTICE, "Dropping RSL link: %s\n", reason); e1inp_sign_link_destroy(trx->rsl_link); trx->rsl_link = NULL; osmo_stat_item_dec(trx->bts->bts_statg->items[BTS_STAT_RSL_CONNECTED], 1); if (trx->bts->c0 == trx) paging_flush_bts(trx->bts, NULL); } void ipaccess_drop_oml(struct gsm_bts *bts, const char *reason) { struct gsm_bts *rdep_bts; struct gsm_bts_trx *trx; /* First of all, remove deferred drop if enabled */ osmo_timer_del(&bts->oml_drop_link_timer); if (!bts->oml_link) return; LOG_BTS(bts, DLINP, LOGL_NOTICE, "Dropping OML link: %s\n", reason); e1inp_sign_link_destroy(bts->oml_link); bts->oml_link = NULL; bts->uptime = 0; osmo_stat_item_dec(bts->bts_statg->items[BTS_STAT_OML_CONNECTED], 1); /* we have issues reconnecting RSL, drop everything. */ llist_for_each_entry(trx, &bts->trx_list, list) ipaccess_drop_rsl(trx, "OML link drop"); gsm_bts_all_ts_dispatch(bts, TS_EV_OML_DOWN, NULL); bts->ip_access.flags = 0; /* * Go through the list and see if we are the depndency of a BTS * and then drop the BTS. This can lead to some recursion but it * should be fine in userspace. * The oml_link is serving as recursion anchor for us and * it is set to NULL some lines above. */ llist_for_each_entry(rdep_bts, &bts->network->bts_list, list) { if (!bts_depend_is_depedency(rdep_bts, bts)) continue; LOGP(DLINP, LOGL_NOTICE, "Dropping BTS(%u) due BTS(%u).\n", rdep_bts->nr, bts->nr); ipaccess_drop_oml(rdep_bts, "Dependency link drop"); } } /*! Callback for \ref ipaccess_drop_oml_deferred_cb. */ static void ipaccess_drop_oml_deferred_cb(void *data) { struct gsm_bts *bts = (struct gsm_bts *) data; ipaccess_drop_oml(bts, "Deferred link drop"); } /*! Deferr \ref ipacces_drop_oml through a timer to avoid dropping structures in * current code context. This may be needed if we want to destroy the OML link * while being called from a lower layer "struct osmo_fd" cb, were it is * mandatory to return -EBADF if the osmo_fd has been destroyed. In case code * destroying an OML link is called through an osmo_signal, it becomes * impossible to return any value, thus deferring the destruction is required. */ void ipaccess_drop_oml_deferred(struct gsm_bts *bts) { if (!osmo_timer_pending(&bts->oml_drop_link_timer) && bts->oml_link) { LOG_BTS(bts, DLINP, LOGL_NOTICE, "Deferring Drop of OML link.\n"); osmo_timer_setup(&bts->oml_drop_link_timer, ipaccess_drop_oml_deferred_cb, bts); osmo_timer_schedule(&bts->oml_drop_link_timer, 0, 0); } } /* Reject BTS because of an unknown unit ID */ static void ipaccess_sign_link_reject(const struct ipaccess_unit *dev, const struct e1inp_ts* ts) { uint16_t site_id = dev->site_id; uint16_t bts_id = dev->bts_id; uint16_t trx_id = dev->trx_id; char ip[INET6_ADDRSTRLEN]; struct gsm_bts_rejected *entry = NULL; struct gsm_bts_rejected *pos; /* Write to log and increase counter */ LOGP(DLINP, LOGL_ERROR, "Unable to find BTS configuration for %u/%u/%u, disconnecting\n", site_id, bts_id, trx_id); rate_ctr_inc(&bsc_gsmnet->bsc_ctrs->ctr[BSC_CTR_UNKNOWN_UNIT_ID]); /* Get remote IP */ if (osmo_sock_get_remote_ip(ts->driver.ipaccess.fd.fd, ip, sizeof(ip))) return; /* Rejected list: unlink existing entry */ llist_for_each_entry(pos, &bsc_gsmnet->bts_rejected, list) { if (pos->site_id == site_id && pos->bts_id == bts_id && !strcmp(pos->ip, ip)) { entry = pos; llist_del(&entry->list); break; } } /* Allocate new entry */ if (!entry) { entry = talloc_zero(tall_bsc_ctx, struct gsm_bts_rejected); if (!entry) return; entry->site_id = site_id; entry->bts_id = bts_id; osmo_strlcpy(entry->ip, ip, sizeof(entry->ip)); } /* Add to beginning with current timestamp */ llist_add(&entry->list, &bsc_gsmnet->bts_rejected); entry->time = time(NULL); /* Cut off last (oldest) element if we have too many */ if (llist_count(&bsc_gsmnet->bts_rejected) > 25) { pos = llist_last_entry(&bsc_gsmnet->bts_rejected, struct gsm_bts_rejected, list); llist_del(&pos->list); talloc_free(pos); } } /* This function is called once the OML/RSL link becomes up. */ static struct e1inp_sign_link * ipaccess_sign_link_up(void *unit_data, struct e1inp_line *line, enum e1inp_sign_type type) { struct gsm_bts *bts; struct ipaccess_unit *dev = unit_data; struct e1inp_sign_link *sign_link = NULL; struct timespec tp; int rc; bts = find_bts_by_unitid(bsc_gsmnet, dev->site_id, dev->bts_id); if (!bts) { ipaccess_sign_link_reject(dev, &line->ts[E1INP_SIGN_OML - 1]); return NULL; } DEBUGP(DLINP, "Identified BTS %u/%u/%u\n", dev->site_id, dev->bts_id, dev->trx_id); switch(type) { case E1INP_SIGN_OML: /* remove old OML signal link for this BTS. */ ipaccess_drop_oml(bts, "new OML link"); if (!bts_depend_check(bts)) { LOGP(DLINP, LOGL_NOTICE, "Dependency not full-filled for %u/%u/%u\n", dev->site_id, dev->bts_id, dev->trx_id); return NULL; } /* create new OML link. */ sign_link = bts->oml_link = e1inp_sign_link_create(&line->ts[E1INP_SIGN_OML - 1], E1INP_SIGN_OML, bts->c0, bts->oml_tei, 0); rc = clock_gettime(CLOCK_MONOTONIC, &tp); bts->uptime = (rc < 0) ? 0 : tp.tv_sec; /* we don't need sub-second precision for uptime */ if (!(sign_link->trx->bts->ip_access.flags & OML_UP)) { e1inp_event(sign_link->ts, S_L_INP_TEI_UP, sign_link->tei, sign_link->sapi); sign_link->trx->bts->ip_access.flags |= OML_UP; } osmo_stat_item_inc(bts->bts_statg->items[BTS_STAT_OML_CONNECTED], 1); break; case E1INP_SIGN_RSL: { struct e1inp_ts *ts; struct gsm_bts_trx *trx = gsm_bts_trx_num(bts, dev->trx_id); /* no OML link set yet? give up. */ if (!bts->oml_link || !trx) return NULL; /* remove old RSL link for this TRX. */ ipaccess_drop_rsl(trx, "new RSL link"); /* set new RSL link for this TRX. */ line = bts->oml_link->ts->line; ts = &line->ts[E1INP_SIGN_RSL + dev->trx_id - 1]; e1inp_ts_config_sign(ts, line); sign_link = trx->rsl_link = e1inp_sign_link_create(ts, E1INP_SIGN_RSL, trx, trx->rsl_tei, 0); trx->rsl_link->ts->sign.delay = 0; if (!(sign_link->trx->bts->ip_access.flags & (RSL_UP << sign_link->trx->nr))) { e1inp_event(sign_link->ts, S_L_INP_TEI_UP, sign_link->tei, sign_link->sapi); sign_link->trx->bts->ip_access.flags |= (RSL_UP << sign_link->trx->nr); } osmo_stat_item_inc(bts->bts_statg->items[BTS_STAT_RSL_CONNECTED], 1); break; } default: break; } return sign_link; } static void ipaccess_sign_link_down(struct e1inp_line *line) { /* No matter what link went down, we close both signal links. */ struct e1inp_ts *ts = &line->ts[E1INP_SIGN_OML-1]; struct gsm_bts *bts = NULL; struct e1inp_sign_link *link; llist_for_each_entry(link, &ts->sign.sign_links, list) { /* Get bts pointer from the first element of the list. */ if (bts == NULL) bts = link->trx->bts; /* Cancel RSL connection timeout in case are still waiting for an RSL connection. */ if (link->trx->mo.nm_state.administrative == NM_STATE_UNLOCKED) osmo_timer_del(&link->trx->rsl_connect_timeout); } if (bts != NULL) ipaccess_drop_oml(bts, "link down"); } /* This function is called if we receive one OML/RSL message. */ static int ipaccess_sign_link(struct msgb *msg) { int ret = 0; struct e1inp_sign_link *link = msg->dst; switch (link->type) { case E1INP_SIGN_RSL: ret = abis_rsl_rcvmsg(msg); break; case E1INP_SIGN_OML: ret = abis_nm_rcvmsg(msg); break; default: LOGP(DLINP, LOGL_ERROR, "Unknown signal link type %d\n", link->type); msgb_free(msg); break; } return ret; } /* not static, ipaccess-config needs it. */ struct e1inp_line_ops ipaccess_e1inp_line_ops = { .cfg = { .ipa = { .addr = "0.0.0.0", .role = E1INP_LINE_R_BSC, }, }, .sign_link_up = ipaccess_sign_link_up, .sign_link_down = ipaccess_sign_link_down, .sign_link = ipaccess_sign_link, }; static void bts_model_nanobts_e1line_bind_ops(struct e1inp_line *line) { e1inp_line_bind_ops(line, &ipaccess_e1inp_line_ops); }