286 lines
10 KiB
C
286 lines
10 KiB
C
/* gprs_bssgp_pcu.cpp
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*
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* Copyright (C) 2021 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <osmocom/gprs/gprs_bssgp.h>
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#include <osmocom/gprs/gprs_bssgp_rim.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/gsm/tlv.h>
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#include <osmocom/gprs/gprs_ns.h>
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#include <osmocom/core/prim.h>
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#include <pcu_l1_if.h>
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#include <gprs_rlcmac.h>
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#include <bts.h>
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#include "gprs_debug.h"
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#include "gprs_pcu.h"
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#include "bts.h"
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#include "gprs_ms.h"
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#include "nacc_fsm.h"
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#define LOGPRIM(nsei, level, fmt, args...) \
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LOGP(DRIM, level, "(NSEI=%u) " fmt, nsei, ## args)
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static inline void gprs_ra_id_ci_to_cgi_ps(struct osmo_cell_global_id_ps *cgi_ps,
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const struct gprs_ra_id *raid, uint16_t cid)
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{
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*cgi_ps = (struct osmo_cell_global_id_ps) {
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.rai.lac.plmn.mcc = raid->mcc,
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.rai.lac.plmn.mnc = raid->mnc,
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.rai.lac.plmn.mnc_3_digits = raid->mnc_3_digits,
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.rai.lac.lac = raid->lac,
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.rai.rac = raid->rac,
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.cell_identity = cid,
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};
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}
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/* Mirror RIM routing information of a given PDU, see also 3GPP TS 48.018, section 8c.1.4.3 */
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static void mirror_rim_routing_info(struct bssgp_ran_information_pdu *to_pdu,
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const struct bssgp_ran_information_pdu *from_pdu)
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{
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memcpy(&to_pdu->routing_info_dest, &from_pdu->routing_info_src, sizeof(to_pdu->routing_info_dest));
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memcpy(&to_pdu->routing_info_src, &from_pdu->routing_info_dest, sizeof(to_pdu->routing_info_src));
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}
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/* Fill NACC application container with data (cell identifier, sysinfo) */
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#define SI_HDR_LEN 2
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static void fill_app_cont_nacc(struct bssgp_ran_inf_app_cont_nacc *app_cont, const struct gprs_rlcmac_bts *bts)
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{
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struct bssgp_bvc_ctx *bctx = the_pcu->bssgp.bctx;
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gprs_ra_id_ci_to_cgi_ps(&app_cont->reprt_cell, &bctx->ra_id, bctx->cell_id);
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app_cont->num_si = 0;
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/* Note: The BTS struct stores the system information including its pseudo header. The RIM application
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* container defines the system information without pseudo header, so we need to chop it off. */
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if (bts->si1_is_set) {
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app_cont->si[app_cont->num_si] = bts->si1 + SI_HDR_LEN;
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app_cont->num_si++;
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}
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if (bts->si3_is_set) {
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app_cont->si[app_cont->num_si] = bts->si3 + SI_HDR_LEN;
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app_cont->num_si++;
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}
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if (bts->si13_is_set) {
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app_cont->si[app_cont->num_si] = bts->si13 + SI_HDR_LEN;
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app_cont->num_si++;
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}
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/* Note: It is possible that the resulting PDU will not contain any system information, even if this is
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* an unlikely case since the BTS immediately updates the system information after startup. The
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* specification permits to send zero system information, see also: 3GPP TS 48.018 section 11.3.63.2.1 */
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if (!bts->si1_is_set || !bts->si3_is_set || !bts->si13_is_set)
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LOGP(DNACC, LOGL_INFO, "TX RAN INFO RESPONSE (NACC) %s: Some SI are missing:%s%s%s\n",
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osmo_cgi_ps_name(&app_cont->reprt_cell),
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bts->si1_is_set ? "" : " SI1",
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bts->si3_is_set ? "" : " SI3",
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bts->si13_is_set ? "" : " SI13");
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}
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/* Format a RAN INFORMATION PDU that contains the requested system information */
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static void format_response_pdu(struct bssgp_ran_information_pdu *resp_pdu,
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const struct bssgp_ran_information_pdu *req_pdu,
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const struct gprs_rlcmac_bts *bts)
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{
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memset(resp_pdu, 0, sizeof(*resp_pdu));
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mirror_rim_routing_info(resp_pdu, req_pdu);
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resp_pdu->decoded.rim_cont = (struct bssgp_ran_inf_rim_cont) {
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.app_id = BSSGP_RAN_INF_APP_ID_NACC,
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.seq_num = 1, /* single report has only one message in response */
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.pdu_ind = {
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.pdu_type_ext = RIM_PDU_TYPE_SING_REP,
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},
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.prot_ver = 1,
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};
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fill_app_cont_nacc(&resp_pdu->decoded.rim_cont.u.app_cont_nacc, bts);
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resp_pdu->decoded_present = true;
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resp_pdu->rim_cont_iei = BSSGP_IE_RI_RIM_CONTAINER;
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}
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/* Format a RAN INFORMATION ERROR PDU */
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static void format_response_pdu_err(struct bssgp_ran_information_pdu *resp_pdu,
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const struct bssgp_ran_information_pdu *req_pdu)
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{
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memset(resp_pdu, 0, sizeof(*resp_pdu));
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mirror_rim_routing_info(resp_pdu, req_pdu);
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resp_pdu->decoded.err_rim_cont = (struct bssgp_ran_inf_err_rim_cont) {
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.app_id = BSSGP_RAN_INF_APP_ID_NACC,
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.prot_ver = 1,
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.err_pdu = req_pdu->rim_cont,
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.err_pdu_len = req_pdu->rim_cont_len,
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};
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resp_pdu->decoded_present = true;
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resp_pdu->rim_cont_iei = BSSGP_IE_RI_ERROR_RIM_COINTAINER;
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}
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static int handle_ran_info_response_nacc(const struct bssgp_ran_inf_app_cont_nacc *nacc, struct gprs_rlcmac_bts *bts)
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{
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struct si_cache_value val;
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struct si_cache_entry *entry;
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struct llist_head *tmp;
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int i;
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LOGP(DRIM, LOGL_INFO, "Rx RAN-INFO cell=%s type=%sBCCH num_si=%d\n",
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osmo_cgi_ps_name(&nacc->reprt_cell),
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nacc->type_psi ? "P" : "", nacc->num_si);
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val.type_psi = nacc->type_psi;
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val.si_len = 0;
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for (i = 0; i < nacc->num_si; i++) {
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size_t len = val.type_psi ? BSSGP_RIM_PSI_LEN : BSSGP_RIM_SI_LEN;
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memcpy(&val.si_buf[val.si_len], nacc->si[i], len);
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val.si_len += len;
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}
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entry = si_cache_add(bts->pcu->si_cache, &nacc->reprt_cell, &val);
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llist_for_each(tmp, bts_ms_list(bts)) {
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struct GprsMs *ms = llist_entry(tmp, typeof(*ms), list);
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if (ms->nacc && nacc_fsm_is_waiting_si_resolution(ms->nacc, &nacc->reprt_cell))
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osmo_fsm_inst_dispatch(ms->nacc->fi, NACC_EV_RX_SI, entry);
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}
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return 0;
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}
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static int handle_ran_info_request(const struct bssgp_ran_information_pdu *pdu,
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struct gprs_rlcmac_bts *bts, uint16_t nsei)
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{
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const struct bssgp_ran_inf_req_rim_cont *ri_req = &pdu->decoded.req_rim_cont;
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const struct bssgp_ran_inf_req_app_cont_nacc *nacc_req;
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struct bssgp_ran_information_pdu resp_pdu;
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int rc;
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/* Check if we support the application ID */
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if (ri_req->app_id != BSSGP_RAN_INF_APP_ID_NACC) {
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LOGPRIM(nsei, LOGL_ERROR,
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"Rx RAN-INFO-REQ for cell %s with unknown/wrong application ID %s -- reject.\n",
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osmo_cgi_ps_name(&bts->cgi_ps), bssgp_ran_inf_app_id_str(ri_req->app_id));
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format_response_pdu_err(&resp_pdu, pdu);
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rc = -ENOTSUP;
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goto tx_ret;
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}
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nacc_req = &ri_req->u.app_cont_nacc;
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rc = osmo_cgi_ps_cmp(&bts->cgi_ps, &nacc_req->reprt_cell);
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if (rc != 0) {
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LOGPRIM(nsei, LOGL_ERROR, "reporting cell in RIM application container %s "
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"does not match destination cell in RIM routing info %s -- rejected.\n",
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osmo_cgi_ps_name(&nacc_req->reprt_cell),
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osmo_cgi_ps_name2(&bts->cgi_ps));
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format_response_pdu_err(&resp_pdu, pdu);
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} else {
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LOGPRIM(nsei, LOGL_INFO, "Responding to RAN INFORMATION REQUEST %s ...\n",
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osmo_cgi_ps_name(&nacc_req->reprt_cell));
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format_response_pdu(&resp_pdu, pdu, bts);
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}
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tx_ret:
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bssgp_tx_rim(&resp_pdu, nsei);
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return rc;
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}
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static int handle_ran_info_response(const struct bssgp_ran_information_pdu *pdu, struct gprs_rlcmac_bts *bts)
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{
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const struct bssgp_ran_inf_rim_cont *ran_info = &pdu->decoded.rim_cont;
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char ri_src_str[64];
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/* Check if we support the application ID */
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if (ran_info->app_id != BSSGP_RAN_INF_APP_ID_NACC) {
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LOGP(DRIM, LOGL_ERROR,
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"Rx RAN-INFO for cell %s with unknown/wrong application ID %s received -- reject.\n",
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osmo_cgi_ps_name(&bts->cgi_ps), bssgp_ran_inf_app_id_str(ran_info->app_id));
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return -1;
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}
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if (ran_info->app_err) {
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LOGP(DRIM, LOGL_ERROR,
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"%s Rx RAN-INFO with an app error! cause: %s\n",
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bssgp_rim_ri_name_buf(ri_src_str, sizeof(ri_src_str), &pdu->routing_info_src),
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bssgp_nacc_cause_str(ran_info->u.app_err_cont_nacc.nacc_cause));
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return -1;
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}
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handle_ran_info_response_nacc(&ran_info->u.app_cont_nacc, bts);
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return 0;
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}
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int handle_rim(struct osmo_bssgp_prim *bp)
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{
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struct msgb *msg = bp->oph.msg;
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uint16_t nsei = msgb_nsei(msg);
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struct bssgp_ran_information_pdu *pdu = &bp->u.rim_pdu;
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struct bssgp_ran_information_pdu resp_pdu;
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struct osmo_cell_global_id_ps dst_addr;
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struct gprs_rlcmac_bts *bts;
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OSMO_ASSERT (bp->oph.sap == SAP_BSSGP_RIM);
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/* At the moment we only support GERAN, so we block all other network
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* types here. */
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if (pdu->routing_info_dest.discr != BSSGP_RIM_ROUTING_INFO_GERAN) {
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LOGPRIM(nsei, LOGL_ERROR,
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"Only GERAN supported, destination cell is not a GERAN cell -- rejected.\n");
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return bssgp_tx_status(BSSGP_CAUSE_UNKN_RIM_AI, NULL, msg);
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}
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/* Check if the RIM pdu is really addressed to this PCU. In case we
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* receive a RIM PDU for a cell that is not parented by this PCU we
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* are supposed to reject it with a BSSGP STATUS.
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* see also: 3GPP TS 48.018, section 8c.3.1.2 */
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gprs_ra_id_ci_to_cgi_ps(&dst_addr, &pdu->routing_info_dest.geran.raid,
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pdu->routing_info_dest.geran.cid);
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bts = gprs_pcu_get_bts_by_cgi_ps(the_pcu, &dst_addr);
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if (!bts) {
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LOGPRIM(nsei, LOGL_ERROR, "Destination cell %s unknown to this pcu\n",
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osmo_cgi_ps_name(&dst_addr));
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return bssgp_tx_status(BSSGP_CAUSE_UNKN_DST, NULL, msg);
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}
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/* Check if the incoming RIM PDU is parseable, if not we must report
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* an error to the controlling BSS 3GPP TS 48.018, 8c.3.4 and 8c.3.4.2 */
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if (!pdu->decoded_present) {
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LOGPRIM(nsei, LOGL_ERROR, "Erroneous RIM PDU received for cell %s -- reject.\n",
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osmo_cgi_ps_name(&dst_addr));
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format_response_pdu_err(&resp_pdu, pdu);
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return 0;
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}
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/* Handle incoming RIM container */
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switch (pdu->rim_cont_iei) {
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case BSSGP_IE_RI_REQ_RIM_CONTAINER:
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return handle_ran_info_request(pdu, bts, nsei);
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case BSSGP_IE_RI_RIM_CONTAINER:
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return handle_ran_info_response(pdu, bts);
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case BSSGP_IE_RI_APP_ERROR_RIM_CONT:
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case BSSGP_IE_RI_ACK_RIM_CONTAINER:
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case BSSGP_IE_RI_ERROR_RIM_COINTAINER:
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LOGPRIM(nsei, LOGL_ERROR, "RIM PDU not handled by this application\n");
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return -EINVAL;
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default:
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/* This should never happen. If the RIM PDU is parsed correctly, then the rim_cont_iei will
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* be set to one of the cases above and if parsing fails this switch statement is guarded
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* by the check on decoded_present above */
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OSMO_ASSERT(false);
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}
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return 0;
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}
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