/* pcu_sock.c: Connect from PCU via unix domain socket */ /* (C) 2008-2010 by Harald Welte * (C) 2009-2012 by Andreas Eversberg * (C) 2012 by Holger Hans Peter Freyther * All Rights Reserved * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 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 General Public License for more details. * */ #include #include #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 pcu_sock_send(struct gsm_bts *bts, struct msgb *msg); static const char *sapi_string[] = { [PCU_IF_SAPI_RACH] = "RACH", [PCU_IF_SAPI_AGCH] = "AGCH", [PCU_IF_SAPI_PCH] = "PCH", [PCU_IF_SAPI_BCCH] = "BCCH", [PCU_IF_SAPI_PDTCH] = "PDTCH", [PCU_IF_SAPI_PRACH] = "PRACH", [PCU_IF_SAPI_PTCCH] = "PTCCH", [PCU_IF_SAPI_PCH_DT] = "PCH_DT", }; bool pcu_connected(struct gsm_bts *bts) { struct pcu_sock_state *state = bts->pcu_state; /* BSC co-located PCU is only supported for Ericsson RBS */ if (!is_ericsson_bts(bts)) return false; if (!state) return false; if (state->conn_bfd.fd <= 0) return false; return true; } /* * PCU messages */ /* Set up an message buffer to package an pcu interface message */ struct msgb *pcu_msgb_alloc(uint8_t msg_type, uint8_t bts_nr) { struct msgb *msg; struct gsm_pcu_if *pcu_prim; msg = msgb_alloc(sizeof(struct gsm_pcu_if), "pcu_sock_tx"); if (!msg) return NULL; msgb_put(msg, sizeof(struct gsm_pcu_if)); pcu_prim = (struct gsm_pcu_if *) msg->data; pcu_prim->msg_type = msg_type; pcu_prim->bts_nr = bts_nr; return msg; } /* Check if the timeslot can be utilized as PDCH now * (PDCH is currently active on BTS) */ static bool ts_now_usable_as_pdch(const struct gsm_bts_trx_ts *ts) { switch (ts->pchan_is) { case GSM_PCHAN_PDCH: /* NOTE: We currently only support Ericsson RBS as a BSC * co-located BTS. This BTS only supports dynamic channels. */ return true; default: return false; } } /* Check if it is possible to use the TS as PDCH (not now, but maybe later) */ static bool ts_usable_as_pdch(const struct gsm_bts_trx_ts *ts) { switch (ts->pchan_from_config) { case GSM_PCHAN_TCH_F_PDCH: case GSM_PCHAN_OSMO_DYN: case GSM_PCHAN_PDCH: return true; default: return false; } } /* Fill the frequency hopping parameter */ static void info_ind_fill_fhp(struct gsm_pcu_if_info_trx_ts *ts_info, const struct gsm_bts_trx_ts *ts) { ts_info->maio = ts->hopping.maio; ts_info->hsn = ts->hopping.hsn; ts_info->hopping = 0x1; memcpy(&ts_info->ma, ts->hopping.ma_data, ts->hopping.ma_len); ts_info->ma_bit_len = ts->hopping.ma_len * 8 - ts->hopping.ma.cur_bit; } /* Fill the TRX parameter */ static void info_ind_fill_trx(struct gsm_pcu_if_info_trx *trx_info, const struct gsm_bts_trx *trx) { unsigned int tn; const struct gsm_bts_trx_ts *ts; trx_info->hlayer1 = 0x2342; trx_info->pdch_mask = 0; trx_info->arfcn = trx->arfcn; if (trx->mo.nm_state.operational != NM_OPSTATE_ENABLED || trx->mo.nm_state.administrative != NM_STATE_UNLOCKED) { LOG_TRX(trx, DPCU, LOGL_INFO, "unavailable for PCU (op=%s adm=%s)\n", abis_nm_opstate_name(trx->mo.nm_state.operational), abis_nm_admin_name(trx->mo.nm_state.administrative)); return; } for (tn = 0; tn < ARRAY_SIZE(trx->ts); tn++) { ts = &trx->ts[tn]; if (ts->mo.nm_state.operational != NM_OPSTATE_ENABLED) continue; if (!ts_now_usable_as_pdch(ts)) continue; trx_info->pdch_mask |= (1 << tn); trx_info->ts[tn].tsc = (ts->tsc >= 0) ? ts->tsc : trx->bts->bsic & 7; if (ts->hopping.enabled) info_ind_fill_fhp(&trx_info->ts[tn], ts); LOG_TRX(trx, DPCU, LOGL_INFO, "PDCH on ts=%u is available (tsc=%u ", ts->nr, trx_info->ts[tn].tsc); if (ts->hopping.enabled) LOGPC(DPCU, LOGL_INFO, "hopping=yes hsn=%u maio=%u ma_bit_len=%u)\n", ts->hopping.hsn, ts->hopping.maio, trx_info->ts[tn].ma_bit_len); else LOGPC(DPCU, LOGL_INFO, "hopping=no arfcn=%u)\n", trx->arfcn); } } /* Send BTS properties to the PCU */ static int pcu_tx_info_ind(struct gsm_bts *bts) { struct msgb *msg; struct gsm_pcu_if *pcu_prim; struct gsm_pcu_if_info_ind *info_ind; struct gprs_rlc_cfg *rlcc; struct gsm_bts_sm *bts_sm; struct gsm_gprs_nsvc *nsvc; struct gsm_bts_trx *trx; int i; bts_sm = bts->site_mgr; LOG_BTS(bts, DPCU, LOGL_INFO, "Sending info for BTS\n"); rlcc = &bts->gprs.cell.rlc_cfg; msg = pcu_msgb_alloc(PCU_IF_MSG_INFO_IND, bts->nr); if (!msg) return -ENOMEM; pcu_prim = (struct gsm_pcu_if *) msg->data; info_ind = &pcu_prim->u.info_ind; info_ind->version = PCU_IF_VERSION; info_ind->flags |= PCU_IF_FLAG_ACTIVE; info_ind->flags |= PCU_IF_FLAG_SYSMO; info_ind->flags |= PCU_IF_FLAG_DT; /* RAI */ info_ind->mcc = bts->network->plmn.mcc; info_ind->mnc = bts->network->plmn.mnc; info_ind->mnc_3_digits = bts->network->plmn.mnc_3_digits; info_ind->lac = bts->location_area_code; info_ind->rac = bts->gprs.rac; /* NSE */ info_ind->nsei = bts_sm->gprs.nse.nsei; memcpy(info_ind->nse_timer, bts_sm->gprs.nse.timer, 7); memcpy(info_ind->cell_timer, bts->gprs.cell.timer, 11); /* cell attributes */ info_ind->bsic = bts->bsic; info_ind->cell_id = bts->cell_identity; info_ind->repeat_time = rlcc->paging.repeat_time; info_ind->repeat_count = rlcc->paging.repeat_count; info_ind->bvci = bts->gprs.cell.bvci; info_ind->t3142 = rlcc->parameter[RLC_T3142]; info_ind->t3169 = rlcc->parameter[RLC_T3169]; info_ind->t3191 = rlcc->parameter[RLC_T3191]; info_ind->t3193_10ms = rlcc->parameter[RLC_T3193]; info_ind->t3195 = rlcc->parameter[RLC_T3195]; info_ind->n3101 = rlcc->parameter[RLC_N3101]; info_ind->n3103 = rlcc->parameter[RLC_N3103]; info_ind->n3105 = rlcc->parameter[RLC_N3105]; info_ind->cv_countdown = rlcc->parameter[CV_COUNTDOWN]; if (rlcc->cs_mask & (1 << GPRS_CS1)) info_ind->flags |= PCU_IF_FLAG_CS1; if (rlcc->cs_mask & (1 << GPRS_CS2)) info_ind->flags |= PCU_IF_FLAG_CS2; if (rlcc->cs_mask & (1 << GPRS_CS3)) info_ind->flags |= PCU_IF_FLAG_CS3; if (rlcc->cs_mask & (1 << GPRS_CS4)) info_ind->flags |= PCU_IF_FLAG_CS4; if (bts->gprs.mode == BTS_GPRS_EGPRS) { if (rlcc->cs_mask & (1 << GPRS_MCS1)) info_ind->flags |= PCU_IF_FLAG_MCS1; if (rlcc->cs_mask & (1 << GPRS_MCS2)) info_ind->flags |= PCU_IF_FLAG_MCS2; if (rlcc->cs_mask & (1 << GPRS_MCS3)) info_ind->flags |= PCU_IF_FLAG_MCS3; if (rlcc->cs_mask & (1 << GPRS_MCS4)) info_ind->flags |= PCU_IF_FLAG_MCS4; if (rlcc->cs_mask & (1 << GPRS_MCS5)) info_ind->flags |= PCU_IF_FLAG_MCS5; if (rlcc->cs_mask & (1 << GPRS_MCS6)) info_ind->flags |= PCU_IF_FLAG_MCS6; if (rlcc->cs_mask & (1 << GPRS_MCS7)) info_ind->flags |= PCU_IF_FLAG_MCS7; if (rlcc->cs_mask & (1 << GPRS_MCS8)) info_ind->flags |= PCU_IF_FLAG_MCS8; if (rlcc->cs_mask & (1 << GPRS_MCS9)) info_ind->flags |= PCU_IF_FLAG_MCS9; } /* TODO: isn't dl_tbf_ext wrong?: * 10 and no ntohs */ info_ind->dl_tbf_ext = rlcc->parameter[T_DL_TBF_EXT]; /* TODO: isn't ul_tbf_ext wrong?: * 10 and no ntohs */ info_ind->ul_tbf_ext = rlcc->parameter[T_UL_TBF_EXT]; info_ind->initial_cs = rlcc->initial_cs; info_ind->initial_mcs = rlcc->initial_mcs; /* NSVC */ for (i = 0; i < ARRAY_SIZE(info_ind->nsvci); i++) { nsvc = &bts->site_mgr->gprs.nsvc[i]; info_ind->nsvci[i] = nsvc->nsvci; info_ind->local_port[i] = nsvc->local_port; switch (nsvc->remote.u.sas.ss_family) { case AF_INET: info_ind->address_type[i] = PCU_IF_ADDR_TYPE_IPV4; info_ind->remote_ip[i].v4 = nsvc->remote.u.sin.sin_addr; info_ind->remote_port[i] = ntohs(nsvc->remote.u.sin.sin_port); break; case AF_INET6: info_ind->address_type[i] = PCU_IF_ADDR_TYPE_IPV6; memcpy(&info_ind->remote_ip[i].v6, &nsvc->remote.u.sin6.sin6_addr, sizeof(struct in6_addr)); info_ind->remote_port[i] = ntohs(nsvc->remote.u.sin6.sin6_port); break; default: info_ind->address_type[i] = PCU_IF_ADDR_TYPE_UNSPEC; break; } } for (i = 0; i < ARRAY_SIZE(info_ind->trx); i++) { trx = gsm_bts_trx_num(bts, i); if (!trx) continue; if (trx->nr >= ARRAY_SIZE(info_ind->trx)) { LOG_TRX(trx, DPCU, LOGL_NOTICE, "PCU interface (version %u) " "cannot handle more than %zu transceivers => skipped\n", PCU_IF_VERSION, ARRAY_SIZE(info_ind->trx)); break; } info_ind_fill_trx(&info_ind->trx[trx->nr], trx); } return pcu_sock_send(bts, msg); } static int pcu_tx_e1_ccu_ind(struct gsm_bts *bts) { struct gsm_bts_trx *trx; llist_for_each_entry(trx, &bts->trx_list, list) { struct gsm_pcu_if_e1_ccu_ind *e1_ccu_ind; int i; if (trx->nr >= PCU_IF_NUM_TRX) { LOG_TRX(trx, DPCU, LOGL_NOTICE, "PCU interface (version %u) " "cannot handle more than %u transceivers => skipped\n", PCU_IF_VERSION, PCU_IF_NUM_TRX); continue; } for (i = 0; i < ARRAY_SIZE(trx->ts); i++) { struct gsm_pcu_if *pcu_prim; struct gsm_bts_trx_ts *ts; struct msgb *msg; int rc; ts = &trx->ts[i]; if (ts->mo.nm_state.operational != NM_OPSTATE_ENABLED) continue; if (!ts_usable_as_pdch(ts)) continue; msg = pcu_msgb_alloc(PCU_IF_MSG_E1_CCU_IND, bts->nr); if (!msg) return -ENOMEM; pcu_prim = (struct gsm_pcu_if *)msg->data; e1_ccu_ind = &pcu_prim->u.e1_ccu_ind; e1_ccu_ind->ts_nr = ts->nr; e1_ccu_ind->trx_nr = trx->nr; e1_ccu_ind->e1_nr = ts->e1_link.e1_nr; e1_ccu_ind->e1_ts = ts->e1_link.e1_ts; e1_ccu_ind->e1_ts_ss = ts->e1_link.e1_ts_ss; LOG_TRX(trx, DPCU, LOGL_INFO, "Sending E1 CCU info for TS %d\n", e1_ccu_ind->ts_nr); rc = pcu_sock_send(bts, msg); if (rc < 0) return -EINVAL; } } return 0; } /* Allow test to overwrite it */ __attribute__((weak)) void pcu_info_update(struct gsm_bts *bts) { if (pcu_connected(bts)) { /* In cases where the CCU is connected via an E1 line, we transmit the connection parameters for the * PDCH before we announce the other BTS related parameters. At the moment Ericsson RBS is the only * E1 BTS we support. */ if (is_ericsson_bts(bts)) pcu_tx_e1_ccu_ind(bts); pcu_tx_info_ind(bts); } } static int pcu_tx_data_ind(struct gsm_bts_trx_ts *ts, uint8_t sapi, uint32_t fn, uint16_t arfcn, uint8_t block_nr, uint8_t *data, uint8_t len, int8_t rssi, uint16_t ber10k, int16_t bto, int16_t lqual) { struct msgb *msg; struct gsm_pcu_if *pcu_prim; struct gsm_pcu_if_data *data_ind; struct gsm_bts *bts = ts->trx->bts; LOGP(DPCU, LOGL_DEBUG, "Sending data indication: sapi=%s arfcn=%d block=%d data=%s\n", sapi_string[sapi], arfcn, block_nr, osmo_hexdump(data, len)); msg = pcu_msgb_alloc(PCU_IF_MSG_DATA_IND, bts->nr); if (!msg) return -ENOMEM; pcu_prim = (struct gsm_pcu_if *) msg->data; data_ind = &pcu_prim->u.data_ind; data_ind->sapi = sapi; data_ind->rssi = rssi; data_ind->fn = fn; data_ind->arfcn = arfcn; data_ind->trx_nr = ts->trx->nr; data_ind->ts_nr = ts->nr; data_ind->block_nr = block_nr; data_ind->ber10k = ber10k; data_ind->ta_offs_qbits = bto; data_ind->lqual_cb = lqual; if (len) memcpy(data_ind->data, data, len); data_ind->len = len; return pcu_sock_send(bts, msg); } /* Forward rach indication to PCU */ int pcu_tx_rach_ind(struct gsm_bts *bts, int16_t qta, uint16_t ra, uint32_t fn, uint8_t is_11bit, enum ph_burst_type burst_type) { struct msgb *msg; struct gsm_pcu_if *pcu_prim; struct gsm_pcu_if_rach_ind *rach_ind; /* Bail if no PCU is connected */ if (!pcu_connected(bts)) { LOG_BTS(bts, DRSL, LOGL_ERROR, "CHAN RQD(GPRS) but PCU not connected!\n"); return -ENODEV; } LOG_BTS(bts, DPCU, LOGL_INFO, "Sending RACH indication: qta=%d, ra=%d, " "fn=%d\n", qta, ra, fn); msg = pcu_msgb_alloc(PCU_IF_MSG_RACH_IND, bts->nr); if (!msg) return -ENOMEM; pcu_prim = (struct gsm_pcu_if *) msg->data; rach_ind = &pcu_prim->u.rach_ind; rach_ind->sapi = PCU_IF_SAPI_RACH; rach_ind->ra = ra; rach_ind->qta = qta; rach_ind->fn = fn; rach_ind->is_11bit = is_11bit; rach_ind->burst_type = burst_type; return pcu_sock_send(bts, msg); } /* Confirm the sending of an immediate assignment to the pcu */ int pcu_tx_imm_ass_sent(struct gsm_bts *bts, uint32_t tlli) { struct msgb *msg; struct gsm_pcu_if *pcu_prim; struct gsm_pcu_if_data_cnf_dt *data_cnf_dt; LOG_BTS(bts, DPCU, LOGL_INFO, "Sending PCH confirm with direct TLLI\n"); msg = pcu_msgb_alloc(PCU_IF_MSG_DATA_CNF_DT, bts->nr); if (!msg) return -ENOMEM; pcu_prim = (struct gsm_pcu_if *) msg->data; data_cnf_dt = &pcu_prim->u.data_cnf_dt; data_cnf_dt->sapi = PCU_IF_SAPI_PCH; data_cnf_dt->tlli = tlli; return pcu_sock_send(bts, msg); } /* we need to decode the raw RR paging message (see PCU code * Encoding::write_paging_request) and extract the mobile identity * (P-TMSI) from it */ static int pcu_rx_rr_paging(struct gsm_bts *bts, uint8_t paging_group, const uint8_t *raw_rr_msg) { struct gsm48_paging1 *p1 = (struct gsm48_paging1 *) raw_rr_msg; uint8_t chan_needed; struct osmo_mobile_identity mi; int rc; switch (p1->msg_type) { case GSM48_MT_RR_PAG_REQ_1: chan_needed = (p1->cneed2 << 2) | p1->cneed1; rc = osmo_mobile_identity_decode(&mi, p1->data+1, p1->data[0], false); if (rc) { LOG_BTS(bts, DPCU, LOGL_ERROR, "PCU Sends paging " "request type %02x (chan_needed=%02x): Unable to decode Mobile Identity\n", p1->msg_type, chan_needed); rc = -EINVAL; break; } LOG_BTS(bts, DPCU, LOGL_ERROR, "PCU Sends paging " "request type %02x (chan_needed=%02x, mi=%s)\n", p1->msg_type, chan_needed, osmo_mobile_identity_to_str_c(OTC_SELECT, &mi)); /* NOTE: We will have to add 2 to mi_len and subtract 2 from * the mi pointer because rsl_paging_cmd() will perform the * reverse operations. This is because rsl_paging_cmd() is * normally expected to chop off the element identifier (0xC0) * and the length field. In our parameter, we do not have * those fields included. */ rc = rsl_paging_cmd(bts, paging_group, &mi, chan_needed, true); break; case GSM48_MT_RR_PAG_REQ_2: case GSM48_MT_RR_PAG_REQ_3: LOG_BTS(bts, DPCU, LOGL_ERROR, "PCU Sends unsupported paging " "request type %02x\n", p1->msg_type); rc = -EINVAL; break; default: LOG_BTS(bts, DPCU, LOGL_ERROR, "PCU Sends unknown paging " "request type %02x\n", p1->msg_type); rc = -EINVAL; break; } return rc; } /* Helper function for pcu_rx_data_req() to extract paging group info (3 byte) */ static uint8_t extract_paging_group(struct gsm_bts *bts, uint8_t *data) { char imsi_digit_buf[4]; uint8_t pag_grp; /* the first three bytes are the last three digits of the IMSI, which we need to compute the paging group */ imsi_digit_buf[0] = data[0]; imsi_digit_buf[1] = data[1]; imsi_digit_buf[2] = data[2]; imsi_digit_buf[3] = '\0'; pag_grp = gsm0502_calc_paging_group(&bts->si_common.chan_desc, str_to_imsi(imsi_digit_buf)); LOG_BTS(bts, DPCU, LOGL_DEBUG, "Calculating paging group: imsi_digit_buf=%s ==> pag_grp=0x%02x\n", imsi_digit_buf, pag_grp); return pag_grp; } static int pcu_rx_data_req(struct gsm_bts *bts, uint8_t msg_type, struct gsm_pcu_if_data *data_req) { uint8_t pag_grp; int rc = 0; struct gsm_pcu_if_pch_dt *pch_dt; LOG_BTS(bts, DPCU, LOGL_DEBUG, "Data request received: sapi=%s arfcn=%d " "block=%d data=%s\n", sapi_string[data_req->sapi], data_req->arfcn, data_req->block_nr, osmo_hexdump(data_req->data, data_req->len)); switch (data_req->sapi) { case PCU_IF_SAPI_PCH: /* Extract 3 byte paging group */ pag_grp = extract_paging_group(bts, data_req->data); pcu_rx_rr_paging(bts, pag_grp, data_req->data+3); break; case PCU_IF_SAPI_AGCH: if (rsl_imm_assign_cmd(bts, data_req->len, data_req->data)) rc = -EIO; break; case PCU_IF_SAPI_PCH_DT: /* DT = direct TLLI. A tlli is prefixed so that the BSC/BTS can confirm the sending of the downlink * IMMEDIATE ASSIGNMENT towards the PCU using this TLLI as a reference. */ if (data_req->len < sizeof(struct gsm_pcu_if_pch_dt)) { LOG_BTS(bts, DPCU, LOGL_ERROR, "Received PCU data request with invalid/small length %d\n", data_req->len); break; } pch_dt = (struct gsm_pcu_if_pch_dt *)data_req->data; pag_grp = gsm0502_calc_paging_group(&bts->si_common.chan_desc, str_to_imsi(pch_dt->imsi)); LOG_BTS(bts, DPCU, LOGL_DEBUG, "PCU Sends immediate assignment via PCH (TLLI=0x%08x, IMSI=%s, Paging group=0x%02x)\n", pch_dt->tlli, pch_dt->imsi, pag_grp); /* NOTE: Sending an IMMEDIATE ASSIGNMENT via PCH became necessary with GPRS in order to be able to * assign downlink TBFs directly through the paging channel. However, this method never became part * of the RSL specs. This means that each BTS vendor has to come up with a proprietary method. At * the moment we only support Ericsson RBS here. */ if (bts->type == GSM_BTS_TYPE_RBS2000) { rc = rsl_ericsson_imm_assign_cmd(bts, pch_dt->tlli, sizeof(pch_dt->data), pch_dt->data, pag_grp); } else { LOG_BTS(bts, DPCU, LOGL_ERROR, "BTS model does not support sending immediate assignment via PCH!\n"); rc = -ENOTSUP; } if (rc) rc = -EIO; break; default: LOG_BTS(bts, DPCU, LOGL_ERROR, "Received PCU data request with " "unsupported sapi %d\n", data_req->sapi); rc = -EINVAL; } return rc; } static int pcu_tx_si(const struct gsm_bts *bts, enum osmo_sysinfo_type si_type, bool enable) { /* the SI is per-BTS so it doesn't matter which TRX we use */ struct gsm_bts_trx *trx = bts->c0; uint8_t si_buf[GSM_MACBLOCK_LEN]; uint8_t len; int rc; if (enable) { memcpy(si_buf, GSM_BTS_SI(bts, si_type), GSM_MACBLOCK_LEN); len = GSM_MACBLOCK_LEN; LOG_BTS(bts, DPCU, LOGL_DEBUG, "Updating SI%s to PCU: %s\n", get_value_string(osmo_sitype_strs, si_type), osmo_hexdump_nospc(si_buf, GSM_MACBLOCK_LEN)); } else { si_buf[0] = si_type; len = 1; /* Note: SI13 is the only system information type that is revked * by just sending a completely empty message. This is due to * historical reasons */ if (si_type != SYSINFO_TYPE_13) len = 0; LOG_BTS(bts, DPCU, LOGL_DEBUG, "Revoking SI%s from PCU\n", get_value_string(osmo_sitype_strs, si_buf[0])); } /* The low-level data like FN, ARFCN etc will be ignored but we have to * set lqual high enough to bypass the check at lower levels */ rc = pcu_tx_data_ind(&trx->ts[0], PCU_IF_SAPI_BCCH, 0, 0, 0, si_buf, len, 0, 0, 0, INT16_MAX); if (rc < 0) LOG_BTS(bts, DPCU, LOGL_NOTICE, "Failed to send SI%s to PCU: rc=%d\n", get_value_string(osmo_sitype_strs, si_type), rc); return rc; } static int pcu_tx_si_all(struct gsm_bts *bts) { const enum osmo_sysinfo_type si_types[] = { SYSINFO_TYPE_1, SYSINFO_TYPE_2, SYSINFO_TYPE_3, SYSINFO_TYPE_13 }; unsigned int i; int rc = 0; for (i = 0; i < ARRAY_SIZE(si_types); i++) { if (GSM_BTS_HAS_SI(bts, si_types[i])) { rc = pcu_tx_si(bts, si_types[i], true); if (rc < 0) return rc; } else { LOG_BTS(bts, DPCU, LOGL_INFO, "SI%s is not available on PCU connection\n", get_value_string(osmo_sitype_strs, si_types[i])); } } return 0; } static int pcu_rx_txt_ind(struct gsm_bts *bts, const struct gsm_pcu_if_txt_ind *txt) { int rc; switch (txt->type) { case PCU_VERSION: LOG_BTS(bts, DPCU, LOGL_INFO, "OsmoPCU version %s connected\n", txt->text); rc = pcu_tx_si_all(bts); if (rc < 0) return -EINVAL; break; case PCU_OML_ALERT: LOG_BTS(bts, DPCU, LOGL_ERROR, "PCU external alarm: %s\n", txt->text); break; default: LOG_BTS(bts, DPCU, LOGL_ERROR, "Unknown TXT_IND type %u received\n", txt->type); return -EINVAL; } return 0; } #define CHECK_IF_MSG_SIZE(prim_len, prim_msg) \ do { \ size_t _len = PCUIF_HDR_SIZE + sizeof(prim_msg); \ if (prim_len < _len) { \ LOGP(DPCU, LOGL_ERROR, "Received %zu bytes on PCU Socket, but primitive %s " \ "size is %zu, discarding\n", prim_len, #prim_msg, _len); \ return -EINVAL; \ } \ } while (0) static int pcu_rx(struct gsm_network *net, uint8_t msg_type, struct gsm_pcu_if *pcu_prim, size_t prim_len) { int rc = 0; struct gsm_bts *bts; /* FIXME: allow multiple BTS */ bts = llist_entry(net->bts_list.next, struct gsm_bts, list); switch (msg_type) { case PCU_IF_MSG_DATA_REQ: case PCU_IF_MSG_PAG_REQ: CHECK_IF_MSG_SIZE(prim_len, pcu_prim->u.data_req); rc = pcu_rx_data_req(bts, msg_type, &pcu_prim->u.data_req); break; case PCU_IF_MSG_TXT_IND: CHECK_IF_MSG_SIZE(prim_len, pcu_prim->u.txt_ind); rc = pcu_rx_txt_ind(bts, &pcu_prim->u.txt_ind); break; default: LOGP(DPCU, LOGL_ERROR, "Received unknown PCU msg type %d\n", msg_type); rc = -EINVAL; } return rc; } /* * PCU socket interface */ static int pcu_sock_send(struct gsm_bts *bts, struct msgb *msg) { struct pcu_sock_state *state = bts->pcu_state; struct osmo_fd *conn_bfd; struct gsm_pcu_if *pcu_prim = (struct gsm_pcu_if *) msg->data; if (!state) { if (pcu_prim->msg_type != PCU_IF_MSG_TIME_IND) LOGP(DPCU, LOGL_INFO, "PCU socket not created, " "dropping message\n"); msgb_free(msg); return -EINVAL; } conn_bfd = &state->conn_bfd; if (conn_bfd->fd <= 0) { if (pcu_prim->msg_type != PCU_IF_MSG_TIME_IND) LOGP(DPCU, LOGL_NOTICE, "PCU socket not connected, " "dropping message\n"); msgb_free(msg); return -EIO; } msgb_enqueue(&state->upqueue, msg); osmo_fd_write_enable(conn_bfd); return 0; } static void pcu_sock_close(struct pcu_sock_state *state) { struct osmo_fd *bfd = &state->conn_bfd; struct gsm_bts *bts; struct gsm_bts_trx *trx; int j; /* FIXME: allow multiple BTS */ bts = llist_entry(state->net->bts_list.next, struct gsm_bts, list); LOGP(DPCU, LOGL_NOTICE, "PCU socket has LOST connection\n"); close(bfd->fd); bfd->fd = -1; osmo_fd_unregister(bfd); /* re-enable the generation of ACCEPT for new connections */ osmo_fd_read_enable(&state->listen_bfd); #if 0 /* remove si13, ... */ bts->si_valid &= ~(1 << SYSINFO_TYPE_13); osmo_signal_dispatch(SS_GLOBAL, S_NEW_SYSINFO, bts); #endif /* release PDCH */ llist_for_each_entry(trx, &bts->trx_list, list) { for (j = 0; j < ARRAY_SIZE(trx->ts); j++) { struct gsm_bts_trx_ts *ts = &trx->ts[j]; /* BSC co-located PCU applies only to Ericsson RBS, which supports only GSM_PCHAN_OSMO_DYN. * So we need to deact only on this pchan kind. */ if (ts->mo.nm_state.operational == NM_OPSTATE_ENABLED && ts->pchan_on_init == GSM_PCHAN_OSMO_DYN) { ts_pdch_deact(ts); } } } /* flush the queue */ while (!llist_empty(&state->upqueue)) { struct msgb *msg = msgb_dequeue(&state->upqueue); msgb_free(msg); } } static int pcu_sock_read(struct osmo_fd *bfd) { struct pcu_sock_state *state = (struct pcu_sock_state *)bfd->data; struct gsm_pcu_if *pcu_prim; struct msgb *msg; int rc; msg = msgb_alloc(sizeof(*pcu_prim) + 1000, "pcu_sock_rx"); if (!msg) return -ENOMEM; pcu_prim = (struct gsm_pcu_if *) msg->tail; rc = recv(bfd->fd, msg->tail, msgb_tailroom(msg), 0); if (rc == 0) goto close; if (rc < 0) { if (errno == EAGAIN) { msgb_free(msg); return 0; } goto close; } if (rc < PCUIF_HDR_SIZE) { LOGP(DPCU, LOGL_ERROR, "Received %d bytes on PCU Socket, but primitive hdr size " "is %zu, discarding\n", rc, PCUIF_HDR_SIZE); msgb_free(msg); return 0; } rc = pcu_rx(state->net, pcu_prim->msg_type, pcu_prim, rc); /* as we always synchronously process the message in pcu_rx() and * its callbacks, we can free the message here. */ msgb_free(msg); return rc; close: msgb_free(msg); pcu_sock_close(state); return -1; } static int pcu_sock_write(struct osmo_fd *bfd) { struct pcu_sock_state *state = bfd->data; int rc; while (!llist_empty(&state->upqueue)) { struct msgb *msg, *msg2; struct gsm_pcu_if *pcu_prim; /* peek at the beginning of the queue */ msg = llist_entry(state->upqueue.next, struct msgb, list); pcu_prim = (struct gsm_pcu_if *)msg->data; osmo_fd_write_disable(bfd); /* bug hunter 8-): maybe someone forgot msgb_put(...) ? */ if (!msgb_length(msg)) { LOGP(DPCU, LOGL_ERROR, "message type (%d) with ZERO " "bytes!\n", pcu_prim->msg_type); goto dontsend; } /* try to send it over the socket */ rc = write(bfd->fd, msgb_data(msg), msgb_length(msg)); if (rc == 0) goto close; if (rc < 0) { if (errno == EAGAIN) { osmo_fd_write_enable(bfd); break; } goto close; } dontsend: /* _after_ we send it, we can deueue */ msg2 = msgb_dequeue(&state->upqueue); assert(msg == msg2); msgb_free(msg); } return 0; close: pcu_sock_close(state); return -1; } static int pcu_sock_cb(struct osmo_fd *bfd, unsigned int flags) { int rc = 0; if (flags & OSMO_FD_READ) rc = pcu_sock_read(bfd); if (rc < 0) return rc; if (flags & OSMO_FD_WRITE) rc = pcu_sock_write(bfd); return rc; } /* accept connection coming from PCU */ static int pcu_sock_accept(struct osmo_fd *bfd, unsigned int flags) { struct pcu_sock_state *state = (struct pcu_sock_state *)bfd->data; struct osmo_fd *conn_bfd = &state->conn_bfd; struct sockaddr_un un_addr; struct gsm_bts *bts; struct gsm_bts_trx *trx; int j; socklen_t len; int fd; /* FIXME: allow multiple BTS */ bts = llist_entry(state->net->bts_list.next, struct gsm_bts, list); len = sizeof(un_addr); fd = accept(bfd->fd, (struct sockaddr *) &un_addr, &len); if (fd < 0) { LOG_BTS(bts, DPCU, LOGL_ERROR, "Failed to accept a new connection\n"); return -1; } if (conn_bfd->fd >= 0) { LOG_BTS(bts, DPCU, LOGL_NOTICE, "PCU connects but we already have another active connection ?!?\n"); /* We already have one PCU connected, this is all we support */ osmo_fd_read_disable(&state->listen_bfd); close(fd); return 0; } osmo_fd_setup(conn_bfd, fd, OSMO_FD_READ, pcu_sock_cb, state, 0); if (osmo_fd_register(conn_bfd) != 0) { LOG_BTS(bts, DPCU, LOGL_ERROR, "Failed to register new connection fd\n"); close(conn_bfd->fd); conn_bfd->fd = -1; return -1; } LOG_BTS(bts, DPCU, LOGL_NOTICE, "PCU socket connected to external PCU\n"); /* activate PDCH */ llist_for_each_entry(trx, &bts->trx_list, list) { for (j = 0; j < ARRAY_SIZE(trx->ts); j++) { struct gsm_bts_trx_ts *ts = &trx->ts[j]; /* (See comment in pcu_sock_close above) */ if (ts->mo.nm_state.operational == NM_OPSTATE_ENABLED && ts->pchan_on_init == GSM_PCHAN_OSMO_DYN) { ts_pdch_act(ts); } } } return 0; } /* Open connection to PCU */ int pcu_sock_init(const char *path, struct gsm_bts *bts) { struct pcu_sock_state *state; struct osmo_fd *bfd; int rc; state = talloc_zero(NULL, struct pcu_sock_state); if (!state) return -ENOMEM; INIT_LLIST_HEAD(&state->upqueue); state->net = bts->network; state->conn_bfd.fd = -1; bfd = &state->listen_bfd; rc = osmo_sock_unix_init(SOCK_SEQPACKET, 0, path, OSMO_SOCK_F_BIND); if (rc < 0) { LOG_BTS(bts, DPCU, LOGL_ERROR, "Could not create unix socket: %s\n", strerror(errno)); talloc_free(state); return -1; } osmo_fd_setup(bfd, rc, OSMO_FD_READ, pcu_sock_accept, state, 0); rc = osmo_fd_register(bfd); if (rc < 0) { LOG_BTS(bts, DPCU, LOGL_ERROR, "Could not register listen fd: %d\n", rc); close(bfd->fd); talloc_free(state); return rc; } LOG_BTS(bts, DPCU, LOGL_INFO, "Started listening on PCU socket: %s\n", path); bts->pcu_state = state; return 0; } /* Close connection to PCU */ void pcu_sock_exit(struct gsm_bts *bts) { struct pcu_sock_state *state = bts->pcu_state; struct osmo_fd *bfd, *conn_bfd; if (!state) return; conn_bfd = &state->conn_bfd; if (conn_bfd->fd > 0) pcu_sock_close(state); bfd = &state->listen_bfd; close(bfd->fd); osmo_fd_unregister(bfd); talloc_free(state); bts->pcu_state = NULL; }