1450 lines
42 KiB
C
1450 lines
42 KiB
C
/* GSM Mobile Radio Interface Layer 3 messages on the A-bis interface
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* 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */
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/* (C) 2008-2016 by Harald Welte <laforge@gnumonks.org>
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* (C) 2008-2012 by Holger Hans Peter Freyther <zecke@selfish.org>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdbool.h>
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#include <errno.h>
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#include <time.h>
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#include <netinet/in.h>
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#include <sys/types.h>
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#include "config.h"
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#include <osmocom/msc/debug.h>
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#include <osmocom/msc/gsm_data.h>
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#include <osmocom/msc/gsm_04_08.h>
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#include <osmocom/msc/signal.h>
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#include <osmocom/msc/transaction.h>
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#include <osmocom/msc/vlr.h>
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#include <osmocom/msc/msc_a.h>
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#include <osmocom/gsm/gsm48.h>
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#include <osmocom/gsm/gsm_utils.h>
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#include <osmocom/gsm/protocol/gsm_04_08.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/core/byteswap.h>
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#include <osmocom/gsm/tlv.h>
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#include <osmocom/crypt/auth.h>
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#include <osmocom/msc/msub.h>
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#include <osmocom/msc/msc_roles.h>
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#include <assert.h>
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void *tall_locop_ctx;
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void *tall_authciphop_ctx;
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static int gsm0408_loc_upd_acc(struct msc_a *msc_a, uint32_t send_tmsi);
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/*! Send a simple GSM 04.08 message without any payload
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* \param conn Active RAN connection
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* \param[in] pdisc Protocol discriminator
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* \param[in] msg_type Message type
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* \return result of \ref gsm48_conn_sendmsg
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*/
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int gsm48_tx_simple(struct msc_a *msc_a, uint8_t pdisc, uint8_t msg_type)
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{
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struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 TX SIMPLE");
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struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
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gh->proto_discr = pdisc;
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gh->msg_type = msg_type;
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return msc_a_tx_dtap_to_i(msc_a, msg);
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}
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/* clear all transactions globally; used in case of MNCC socket disconnect */
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void gsm0408_clear_all_trans(struct gsm_network *net, enum trans_type type)
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{
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struct gsm_trans *trans, *temp;
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LOGP(DCC, LOGL_NOTICE, "Clearing all currently active transactions!!!\n");
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llist_for_each_entry_safe(trans, temp, &net->trans_list, entry) {
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if (trans->type == type) {
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trans->callref = 0;
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trans_free(trans);
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}
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}
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}
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/* Chapter 9.2.14 : Send LOCATION UPDATING REJECT */
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static int gsm0408_loc_upd_rej(struct msc_a *msc_a, uint8_t cause)
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{
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struct msgb *msg;
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msg = gsm48_create_loc_upd_rej(cause);
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if (!msg) {
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LOG_MSC_A_CAT(msc_a, DMM, LOGL_ERROR, "Failed to create msg for LOCATION UPDATING REJECT.\n");
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return -1;
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}
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LOG_MSC_A_CAT(msc_a, DMM, LOGL_INFO, "LOCATION UPDATING REJECT\n");
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return msc_a_tx_dtap_to_i(msc_a, msg);
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}
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/* Chapter 9.2.13 : Send LOCATION UPDATE ACCEPT */
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static int gsm0408_loc_upd_acc(struct msc_a *msc_a, uint32_t send_tmsi)
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{
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struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 LOC UPD ACC");
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struct gsm48_hdr *gh;
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struct gsm48_loc_area_id *lai;
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uint8_t *mid;
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struct gsm_network *net = msc_a_net(msc_a);
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struct vlr_subscr *vsub = msc_a_vsub(msc_a);
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struct osmo_location_area_id laid = {
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.plmn = net->plmn,
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.lac = vsub->cgi.lai.lac,
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};
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gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
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gh->proto_discr = GSM48_PDISC_MM;
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gh->msg_type = GSM48_MT_MM_LOC_UPD_ACCEPT;
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lai = (struct gsm48_loc_area_id *) msgb_put(msg, sizeof(*lai));
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gsm48_generate_lai2(lai, &laid);
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if (send_tmsi == GSM_RESERVED_TMSI) {
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/* we did not allocate a TMSI to the MS, so we need to
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* include the IMSI in order for the MS to delete any
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* old TMSI that might still be allocated */
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uint8_t mi[10];
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int len;
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len = gsm48_generate_mid_from_imsi(mi, vsub->imsi);
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mid = msgb_put(msg, len);
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memcpy(mid, mi, len);
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DEBUGP(DMM, "-> %s LOCATION UPDATE ACCEPT\n",
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vlr_subscr_name(vsub));
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} else {
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/* Include the TMSI, which means that the MS will send a
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* TMSI REALLOCATION COMPLETE, and we should wait for
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* that until T3250 expiration */
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mid = msgb_put(msg, GSM48_MID_TMSI_LEN);
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gsm48_generate_mid_from_tmsi(mid, send_tmsi);
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DEBUGP(DMM, "-> %s LOCATION UPDATE ACCEPT (TMSI = 0x%08x)\n",
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vlr_subscr_name(vsub),
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send_tmsi);
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}
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/* TODO: Follow-on proceed */
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/* TODO: CTS permission */
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/* TODO: Equivalent PLMNs */
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/* TODO: Emergency Number List */
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/* TODO: Per-MS T3312 */
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return msc_a_tx_dtap_to_i(msc_a, msg);
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}
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/* Transmit Chapter 9.2.10 Identity Request */
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static int mm_tx_identity_req(struct msc_a *msc_a, uint8_t id_type)
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{
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struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 ID REQ");
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struct gsm48_hdr *gh;
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gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
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gh->proto_discr = GSM48_PDISC_MM;
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gh->msg_type = GSM48_MT_MM_ID_REQ;
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gh->data[0] = id_type;
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return msc_a_tx_dtap_to_i(msc_a, msg);
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}
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/* Parse Chapter 9.2.11 Identity Response */
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static int mm_rx_id_resp(struct msc_a *msc_a, struct msgb *msg)
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{
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struct gsm48_hdr *gh = msgb_l3(msg);
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uint8_t *mi = gh->data+1;
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uint8_t mi_len = gh->data[0];
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struct vlr_subscr *vsub = msc_a_vsub(msc_a);
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if (!vsub) {
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LOGP(DMM, LOGL_ERROR,
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"Rx MM Identity Response: invalid: no subscriber\n");
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return -EINVAL;
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}
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DEBUGP(DMM, "IDENTITY RESPONSE: MI=%s\n", osmo_mi_name(mi, mi_len));
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osmo_signal_dispatch(SS_SUBSCR, S_SUBSCR_IDENTITY, gh->data);
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return vlr_subscr_rx_id_resp(vsub, mi, mi_len);
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}
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/* 9.2.5 CM service accept */
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static int msc_gsm48_tx_mm_serv_ack(struct msc_a *msc_a)
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{
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struct msgb *msg;
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struct gsm48_hdr *gh;
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msg = gsm48_msgb_alloc_name("GSM 04.08 SERV ACC");
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gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
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gh->proto_discr = GSM48_PDISC_MM;
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gh->msg_type = GSM48_MT_MM_CM_SERV_ACC;
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return msc_a_tx_dtap_to_i(msc_a, msg);
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}
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/* 9.2.6 CM service reject */
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static int msc_gsm48_tx_mm_serv_rej(struct msc_a *msc_a,
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enum gsm48_reject_value value)
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{
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struct msgb *msg;
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msg = gsm48_create_mm_serv_rej(value);
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if (!msg) {
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LOGP(DMM, LOGL_ERROR, "Failed to allocate CM Service Reject.\n");
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return -1;
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}
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LOG_MSC_A_CAT(msc_a, DMM, LOGL_DEBUG, "-> CM SERVICE Reject cause: %d\n", value);
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return msc_a_tx_dtap_to_i(msc_a, msg);
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}
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/* Extract the R99 flag from various Complete Level 3 messages. Depending on the Message Type, extract R99 from the
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* Classmark Type 1 or the Classmark Type 2. Return 1 for R99, 0 for pre-R99, negative if not a valid Complete Level 3
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* message. */
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int compl_l3_msg_is_r99(const struct msgb *msg)
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{
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const struct gsm48_hdr *gh = msgb_l3(msg);
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uint8_t pdisc = gsm48_hdr_pdisc(gh);
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const struct gsm48_loc_upd_req *lu;
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const struct gsm48_imsi_detach_ind *idi;
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uint8_t cm2_len;
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const struct gsm48_classmark2 *cm2;
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switch (pdisc) {
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case GSM48_PDISC_MM:
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switch (gsm48_hdr_msg_type(gh)) {
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case GSM48_MT_MM_LOC_UPD_REQUEST:
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lu = (const struct gsm48_loc_upd_req *) gh->data;
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return osmo_gsm48_classmark1_is_r99(&lu->classmark1) ? 1 : 0;
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case GSM48_MT_MM_CM_SERV_REQ:
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case GSM48_MT_MM_CM_REEST_REQ:
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break;
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case GSM48_MT_MM_IMSI_DETACH_IND:
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idi = (const struct gsm48_imsi_detach_ind *) gh->data;
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return osmo_gsm48_classmark1_is_r99(&idi->classmark1) ? 1 : 0;
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default:
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return -1;
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}
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break;
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case GSM48_PDISC_RR:
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switch (gsm48_hdr_msg_type(gh)) {
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case GSM48_MT_RR_PAG_RESP:
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break;
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default:
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return -1;
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}
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break;
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default:
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return -1;
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}
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/* Both CM Service Request and Paging Response have Classmark Type 2 at the same location: */
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cm2_len = gh->data[1];
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cm2 = (void*)gh->data+2;
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return osmo_gsm48_classmark2_is_r99(cm2, cm2_len) ? 1 : 0;
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}
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/* Chapter 9.2.15: Receive Location Updating Request.
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* Keep this function non-static for direct invocation by unit tests. */
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static int mm_rx_loc_upd_req(struct msc_a *msc_a, struct msgb *msg)
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{
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struct gsm48_hdr *gh = msgb_l3(msg);
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struct gsm48_loc_upd_req *lu;
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uint8_t mi_type;
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char mi_string[GSM48_MI_SIZE];
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enum vlr_lu_type vlr_lu_type = VLR_LU_TYPE_REGULAR;
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uint32_t tmsi;
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char *imsi;
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struct osmo_location_area_id old_lai;
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struct osmo_fsm_inst *lu_fsm;
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bool is_utran;
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struct gsm_network *net = msc_a_net(msc_a);
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struct vlr_subscr *vsub;
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lu = (struct gsm48_loc_upd_req *) gh->data;
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if (msc_a_is_establishing_auth_ciph(msc_a)) {
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LOG_MSC_A_CAT(msc_a, DMM, LOGL_ERROR,
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"Cannot accept another LU, conn already busy establishing authenticity;"
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" extraneous LOCATION UPDATING REQUEST: MI=%s LU-type=%s\n",
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osmo_mi_name(lu->mi, lu->mi_len), osmo_lu_type_name(lu->type));
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return -EINVAL;
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}
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if (msc_a_is_accepted(msc_a)) {
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LOG_MSC_A_CAT(msc_a, DMM, LOGL_ERROR,
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"Cannot accept another LU, conn already established;"
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" extraneous LOCATION UPDATING REQUEST: MI=%s LU-type=%s\n",
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osmo_mi_name(lu->mi, lu->mi_len), osmo_lu_type_name(lu->type));
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return -EINVAL;
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}
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msc_a->complete_layer3_type = COMPLETE_LAYER3_LU;
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msub_update_id_from_mi(msc_a->c.msub, lu->mi, lu->mi_len);
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LOG_MSC_A_CAT(msc_a, DMM, LOGL_DEBUG, "LOCATION UPDATING REQUEST: MI=%s LU-type=%s\n",
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osmo_mi_name(lu->mi, lu->mi_len), osmo_lu_type_name(lu->type));
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osmo_signal_dispatch(SS_SUBSCR, S_SUBSCR_IDENTITY, &lu->mi_len);
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switch (lu->type) {
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case GSM48_LUPD_NORMAL:
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rate_ctr_inc(&net->msc_ctrs->ctr[MSC_CTR_LOC_UPDATE_TYPE_NORMAL]);
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vlr_lu_type = VLR_LU_TYPE_REGULAR;
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break;
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case GSM48_LUPD_IMSI_ATT:
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rate_ctr_inc(&net->msc_ctrs->ctr[MSC_CTR_LOC_UPDATE_TYPE_ATTACH]);
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vlr_lu_type = VLR_LU_TYPE_IMSI_ATTACH;
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break;
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case GSM48_LUPD_PERIODIC:
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rate_ctr_inc(&net->msc_ctrs->ctr[MSC_CTR_LOC_UPDATE_TYPE_PERIODIC]);
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vlr_lu_type = VLR_LU_TYPE_PERIODIC;
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break;
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}
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/* TODO: 10.5.1.6 MS Classmark for UMTS / Classmark 2 */
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/* TODO: 10.5.3.14 Aditional update parameters (CS fallback calls) */
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/* TODO: 10.5.7.8 Device properties */
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/* TODO: 10.5.1.15 MS network feature support */
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mi_type = lu->mi[0] & GSM_MI_TYPE_MASK;
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gsm48_mi_to_string(mi_string, sizeof(mi_string), lu->mi, lu->mi_len);
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switch (mi_type) {
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case GSM_MI_TYPE_IMSI:
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tmsi = GSM_RESERVED_TMSI;
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imsi = mi_string;
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break;
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case GSM_MI_TYPE_TMSI:
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tmsi = tmsi_from_string(mi_string);
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imsi = NULL;
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break;
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default:
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LOG_MSC_A_CAT(msc_a, DMM, LOGL_ERROR, "unknown mobile identity type\n");
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tmsi = GSM_RESERVED_TMSI;
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imsi = NULL;
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break;
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}
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gsm48_decode_lai2(&lu->lai, &old_lai);
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LOG_MSC_A_CAT(msc_a, DMM, LOGL_DEBUG, "USIM: old LAI: %s\n", osmo_lai_name(&old_lai));
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msc_a_get(msc_a, __func__);
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msc_a_get(msc_a, MSC_A_USE_LOCATION_UPDATING);
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is_utran = (msc_a->c.ran->type == OSMO_RAT_UTRAN_IU);
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lu_fsm = vlr_loc_update(msc_a->c.fi,
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MSC_A_EV_AUTHENTICATED, MSC_A_EV_CN_CLOSE, NULL,
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net->vlr, msc_a, vlr_lu_type, tmsi, imsi,
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&old_lai, &msc_a->via_cell.lai,
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is_utran || net->authentication_required,
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is_utran ? net->uea_encryption : net->a5_encryption_mask > 0x01,
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lu->key_seq,
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osmo_gsm48_classmark1_is_r99(&lu->classmark1),
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is_utran,
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net->vlr->cfg.assign_tmsi);
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if (!lu_fsm) {
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LOG_MSC_A(msc_a, LOGL_ERROR, "Can't start LU FSM\n");
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msc_a_put(msc_a, MSC_A_USE_LOCATION_UPDATING);
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msc_a_put(msc_a, __func__);
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return 0;
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}
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/* From vlr_loc_update() we expect an implicit dispatch of
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* VLR_ULA_E_UPDATE_LA, and thus we expect msc_vlr_subscr_assoc() to
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* already have been called and completed. Has an error occurred? */
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vsub = msc_a_vsub(msc_a);
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if (!vsub) {
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msc_a_put(msc_a, __func__);
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return 0;
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}
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if (vsub->lu_fsm != lu_fsm) {
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LOG_MSC_A(msc_a, LOGL_ERROR, "Internal Error during Location Updating attempt\n");
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msc_a_release_cn(msc_a);
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msc_a_put(msc_a, __func__);
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return -EIO;
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}
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vsub->classmark.classmark1 = lu->classmark1;
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vsub->classmark.classmark1_set = true;
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msc_a_put(msc_a, __func__);
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return 0;
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}
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/* Turn int into semi-octet representation: 98 => 0x89 */
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/* FIXME: libosmocore/libosmogsm */
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static uint8_t bcdify(uint8_t value)
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{
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uint8_t ret;
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ret = value / 10;
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ret |= (value % 10) << 4;
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return ret;
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}
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/* Generate a message buffer that contains a valid MM info message,
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* See also 3GPP TS 24.008, chapter 9.2.15a */
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struct msgb *gsm48_create_mm_info(struct gsm_network *net)
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{
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struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 MM INF");
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struct gsm48_hdr *gh;
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uint8_t *ptr8;
|
|
int name_len, name_pad;
|
|
|
|
time_t cur_t;
|
|
struct tm* gmt_time;
|
|
struct tm* local_time;
|
|
int tzunits;
|
|
int dst = 0;
|
|
|
|
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
|
|
gh->proto_discr = GSM48_PDISC_MM;
|
|
gh->msg_type = GSM48_MT_MM_INFO;
|
|
|
|
if (net->name_long) {
|
|
#if 0
|
|
name_len = strlen(net->name_long);
|
|
/* 10.5.3.5a */
|
|
ptr8 = msgb_put(msg, 3);
|
|
ptr8[0] = GSM48_IE_NAME_LONG;
|
|
ptr8[1] = name_len*2 +1;
|
|
ptr8[2] = 0x90; /* UCS2, no spare bits, no CI */
|
|
|
|
ptr16 = (uint16_t *) msgb_put(msg, name_len*2);
|
|
for (i = 0; i < name_len; i++)
|
|
ptr16[i] = htons(net->name_long[i]);
|
|
|
|
/* FIXME: Use Cell Broadcast, not UCS-2, since
|
|
* UCS-2 is only supported by later revisions of the spec */
|
|
#endif
|
|
name_len = (strlen(net->name_long)*7)/8;
|
|
name_pad = (8 - strlen(net->name_long)*7)%8;
|
|
if (name_pad > 0)
|
|
name_len++;
|
|
/* 10.5.3.5a */
|
|
ptr8 = msgb_put(msg, 3);
|
|
ptr8[0] = GSM48_IE_NAME_LONG;
|
|
ptr8[1] = name_len +1;
|
|
ptr8[2] = 0x80 | name_pad; /* Cell Broadcast DCS, no CI */
|
|
|
|
ptr8 = msgb_put(msg, name_len);
|
|
gsm_7bit_encode_n(ptr8, name_len, net->name_long, NULL);
|
|
|
|
}
|
|
|
|
if (net->name_short) {
|
|
#if 0
|
|
name_len = strlen(net->name_short);
|
|
/* 10.5.3.5a */
|
|
ptr8 = (uint8_t *) msgb_put(msg, 3);
|
|
ptr8[0] = GSM48_IE_NAME_SHORT;
|
|
ptr8[1] = name_len*2 + 1;
|
|
ptr8[2] = 0x90; /* UCS2, no spare bits, no CI */
|
|
|
|
ptr16 = (uint16_t *) msgb_put(msg, name_len*2);
|
|
for (i = 0; i < name_len; i++)
|
|
ptr16[i] = htons(net->name_short[i]);
|
|
#endif
|
|
name_len = (strlen(net->name_short)*7)/8;
|
|
name_pad = (8 - strlen(net->name_short)*7)%8;
|
|
if (name_pad > 0)
|
|
name_len++;
|
|
/* 10.5.3.5a */
|
|
ptr8 = (uint8_t *) msgb_put(msg, 3);
|
|
ptr8[0] = GSM48_IE_NAME_SHORT;
|
|
ptr8[1] = name_len +1;
|
|
ptr8[2] = 0x80 | name_pad; /* Cell Broadcast DCS, no CI */
|
|
|
|
ptr8 = msgb_put(msg, name_len);
|
|
gsm_7bit_encode_n(ptr8, name_len, net->name_short, NULL);
|
|
|
|
}
|
|
|
|
/* Section 10.5.3.9 */
|
|
cur_t = time(NULL);
|
|
gmt_time = gmtime(&cur_t);
|
|
|
|
ptr8 = msgb_put(msg, 8);
|
|
ptr8[0] = GSM48_IE_NET_TIME_TZ;
|
|
ptr8[1] = bcdify(gmt_time->tm_year % 100);
|
|
ptr8[2] = bcdify(gmt_time->tm_mon + 1);
|
|
ptr8[3] = bcdify(gmt_time->tm_mday);
|
|
ptr8[4] = bcdify(gmt_time->tm_hour);
|
|
ptr8[5] = bcdify(gmt_time->tm_min);
|
|
ptr8[6] = bcdify(gmt_time->tm_sec);
|
|
|
|
if (net->tz.override) {
|
|
/* Convert tz.hr and tz.mn to units */
|
|
if (net->tz.hr < 0) {
|
|
tzunits = ((net->tz.hr/-1)*4);
|
|
tzunits = tzunits + (net->tz.mn/15);
|
|
ptr8[7] = bcdify(tzunits);
|
|
/* Set negative time */
|
|
ptr8[7] |= 0x08;
|
|
}
|
|
else {
|
|
tzunits = net->tz.hr*4;
|
|
tzunits = tzunits + (net->tz.mn/15);
|
|
ptr8[7] = bcdify(tzunits);
|
|
}
|
|
/* Convert DST value */
|
|
if (net->tz.dst >= 0 && net->tz.dst <= 2)
|
|
dst = net->tz.dst;
|
|
}
|
|
else {
|
|
/* Need to get GSM offset and convert into 15 min units */
|
|
/* This probably breaks if gmtoff returns a value not evenly divisible by 15? */
|
|
#ifdef HAVE_TM_GMTOFF_IN_TM
|
|
local_time = localtime(&cur_t);
|
|
tzunits = (local_time->tm_gmtoff/60)/15;
|
|
#else
|
|
/* find timezone offset */
|
|
time_t utc;
|
|
double offsetFromUTC;
|
|
utc = mktime(gmt_time);
|
|
local_time = localtime(&cur_t);
|
|
offsetFromUTC = difftime(cur_t, utc);
|
|
if (local_time->tm_isdst)
|
|
offsetFromUTC += 3600.0;
|
|
tzunits = ((int)offsetFromUTC) / 60 / 15;
|
|
#endif
|
|
if (tzunits < 0) {
|
|
tzunits = tzunits/-1;
|
|
ptr8[7] = bcdify(tzunits);
|
|
/* Flip it to negative */
|
|
ptr8[7] |= 0x08;
|
|
}
|
|
else
|
|
ptr8[7] = bcdify(tzunits);
|
|
|
|
/* Does not support DST +2 */
|
|
if (local_time->tm_isdst)
|
|
dst = 1;
|
|
}
|
|
|
|
if (dst) {
|
|
ptr8 = msgb_put(msg, 3);
|
|
ptr8[0] = GSM48_IE_NET_DST;
|
|
ptr8[1] = 1;
|
|
ptr8[2] = dst;
|
|
}
|
|
|
|
return msg;
|
|
}
|
|
|
|
/* Section 9.2.15a */
|
|
int gsm48_tx_mm_info(struct msc_a *msc_a)
|
|
{
|
|
struct gsm_network *net = msc_a_net(msc_a);
|
|
struct msgb *msg;
|
|
|
|
msg = gsm48_create_mm_info(net);
|
|
|
|
LOG_MSC_A(msc_a, LOGL_DEBUG, "Tx MM INFO\n");
|
|
return msc_a_tx_dtap_to_i(msc_a, msg);
|
|
}
|
|
|
|
/*! Send an Authentication Request to MS on the given RAN connection
|
|
* according to 3GPP/ETSI TS 24.008, Section 9.2.2.
|
|
* \param[in] conn Subscriber connection to send on.
|
|
* \param[in] rand Random challenge token to send, must be 16 bytes long.
|
|
* \param[in] autn r99: In case of UMTS mutual authentication, AUTN token to
|
|
* send; must be 16 bytes long, or pass NULL for plain GSM auth.
|
|
* \param[in] key_seq auth tuple's sequence number.
|
|
*/
|
|
int gsm48_tx_mm_auth_req(struct msc_a *msc_a, uint8_t *rand,
|
|
uint8_t *autn, int key_seq)
|
|
{
|
|
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 AUTH REQ");
|
|
struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
|
|
struct gsm48_auth_req *ar = (struct gsm48_auth_req *) msgb_put(msg, sizeof(*ar));
|
|
|
|
DEBUGP(DMM, "Tx AUTH REQ (rand = %s)\n", osmo_hexdump_nospc(rand, 16));
|
|
if (autn)
|
|
DEBUGP(DMM, " AUTH REQ (autn = %s)\n", osmo_hexdump_nospc(autn, 16));
|
|
|
|
gh->proto_discr = GSM48_PDISC_MM;
|
|
gh->msg_type = GSM48_MT_MM_AUTH_REQ;
|
|
|
|
ar->key_seq = key_seq;
|
|
|
|
/* 16 bytes RAND parameters */
|
|
osmo_static_assert(sizeof(ar->rand) == 16, sizeof_auth_req_r99_rand);
|
|
if (rand)
|
|
memcpy(ar->rand, rand, 16);
|
|
|
|
|
|
/* 16 bytes AUTN */
|
|
if (autn)
|
|
msgb_tlv_put(msg, GSM48_IE_AUTN, 16, autn);
|
|
|
|
return msc_a_tx_dtap_to_i(msc_a, msg);
|
|
}
|
|
|
|
/* Section 9.2.1 */
|
|
int gsm48_tx_mm_auth_rej(struct msc_a *msc_a)
|
|
{
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_DEBUG, "-> AUTH REJECT\n");
|
|
return gsm48_tx_simple(msc_a, GSM48_PDISC_MM, GSM48_MT_MM_AUTH_REJ);
|
|
}
|
|
|
|
static int msc_vlr_tx_cm_serv_rej(void *msc_conn_ref, enum osmo_cm_service_type cm_service_type,
|
|
enum gsm48_reject_value cause);
|
|
|
|
static int cm_serv_reuse_conn(struct msc_a *msc_a, const uint8_t *mi_lv, enum osmo_cm_service_type cm_serv_type)
|
|
{
|
|
uint8_t mi_type;
|
|
char mi_string[GSM48_MI_SIZE];
|
|
uint32_t tmsi;
|
|
struct gsm_network *net = msc_a_net(msc_a);
|
|
struct vlr_subscr *vsub = msc_a_vsub(msc_a);
|
|
|
|
gsm48_mi_to_string(mi_string, sizeof(mi_string), mi_lv+1, mi_lv[0]);
|
|
mi_type = mi_lv[1] & GSM_MI_TYPE_MASK;
|
|
|
|
switch (mi_type) {
|
|
case GSM_MI_TYPE_IMSI:
|
|
if (vlr_subscr_matches_imsi(vsub, mi_string))
|
|
goto accept_reuse;
|
|
break;
|
|
case GSM_MI_TYPE_TMSI:
|
|
tmsi = osmo_load32be(mi_lv+2);
|
|
if (vlr_subscr_matches_tmsi(vsub, tmsi))
|
|
goto accept_reuse;
|
|
break;
|
|
case GSM_MI_TYPE_IMEI:
|
|
if (vlr_subscr_matches_imei(vsub, mi_string))
|
|
goto accept_reuse;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_ERROR, "CM Service Request with mismatching mobile identity: %s %s\n",
|
|
gsm48_mi_type_name(mi_type), mi_string);
|
|
msc_vlr_tx_cm_serv_rej(msc_a, cm_serv_type, GSM48_REJECT_ILLEGAL_MS);
|
|
return -EINVAL;
|
|
|
|
accept_reuse:
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_DEBUG, "re-using already accepted connection\n");
|
|
|
|
msc_a_get(msc_a, msc_a_cm_service_type_to_use(cm_serv_type));
|
|
msub_update_id(msc_a->c.msub);
|
|
return net->vlr->ops.tx_cm_serv_acc(msc_a, cm_serv_type);
|
|
}
|
|
|
|
/*
|
|
* Handle CM Service Requests
|
|
* a) Verify that the packet is long enough to contain the information
|
|
* we require otherwsie reject with INCORRECT_MESSAGE
|
|
* b) Try to parse the TMSI. If we do not have one reject
|
|
* c) Check that we know the subscriber with the TMSI otherwise reject
|
|
* with a HLR cause
|
|
* d) Set the subscriber on the conn and accept
|
|
*
|
|
* Keep this function non-static for direct invocation by unit tests.
|
|
*/
|
|
int gsm48_rx_mm_serv_req(struct msc_a *msc_a, struct msgb *msg)
|
|
{
|
|
struct gsm_network *net = msc_a_net(msc_a);
|
|
struct gsm48_hdr *gh;
|
|
struct gsm48_service_request *req;
|
|
struct gsm48_classmark2 *cm2;
|
|
uint8_t *cm2_buf, cm2_len;
|
|
uint8_t *mi_buf, mi_len;
|
|
uint8_t *mi, mi_type;
|
|
bool is_utran;
|
|
struct vlr_subscr *vsub;
|
|
|
|
/* Make sure that both header and CM Service Request fit into the buffer */
|
|
if (msgb_l3len(msg) < sizeof(*gh) + sizeof(*req)) {
|
|
LOG_MSC_A(msc_a, LOGL_ERROR, "Rx CM SERVICE REQUEST: wrong message size (%u < %zu)\n",
|
|
msgb_l3len(msg), sizeof(*gh) + sizeof(*req));
|
|
return msc_gsm48_tx_mm_serv_rej(msc_a, GSM48_REJECT_INCORRECT_MESSAGE);
|
|
}
|
|
|
|
gh = (struct gsm48_hdr *) msgb_l3(msg);
|
|
req = (struct gsm48_service_request *) gh->data;
|
|
|
|
/* Unfortunately in Phase1 the Classmark2 length is variable, so we cannot
|
|
* just use gsm48_service_request struct, and need to parse it manually. */
|
|
cm2_len = gh->data[1];
|
|
cm2_buf = gh->data + 2;
|
|
cm2 = (struct gsm48_classmark2 *) cm2_buf;
|
|
|
|
/* Prevent buffer overrun: check the length of Classmark2 */
|
|
if (cm2_buf + cm2_len > msg->tail) {
|
|
LOG_MSC_A(msc_a, LOGL_ERROR, "Rx CM SERVICE REQUEST: Classmark2 "
|
|
"length=%u is too big\n", cm2_len);
|
|
return msc_gsm48_tx_mm_serv_rej(msc_a, GSM48_REJECT_INCORRECT_MESSAGE);
|
|
}
|
|
|
|
/* MI (Mobile Identity) LV follows the Classmark2 */
|
|
mi_buf = cm2_buf + cm2_len;
|
|
mi_len = mi_buf[0];
|
|
mi = mi_buf + 1;
|
|
|
|
/* Prevent buffer overrun: check the length of MI */
|
|
if (mi_buf + mi_len > msg->tail) {
|
|
LOG_MSC_A(msc_a, LOGL_ERROR, "Rx CM SERVICE REQUEST: Mobile Identity "
|
|
"length=%u is too big\n", cm2_len);
|
|
return msc_gsm48_tx_mm_serv_rej(msc_a, GSM48_REJECT_INCORRECT_MESSAGE);
|
|
}
|
|
|
|
if (msc_a_is_establishing_auth_ciph(msc_a)) {
|
|
LOG_MSC_A(msc_a, LOGL_ERROR,
|
|
"Cannot accept CM Service Request, conn already busy establishing authenticity\n");
|
|
return msc_gsm48_tx_mm_serv_rej(msc_a, GSM48_REJECT_CONGESTION);
|
|
/* or should we accept and note down the service request anyway? */
|
|
}
|
|
|
|
msc_a->complete_layer3_type = COMPLETE_LAYER3_CM_SERVICE_REQ;
|
|
msub_update_id_from_mi(msc_a->c.msub, mi, mi_len);
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_DEBUG, "Rx CM SERVICE REQUEST cm_service_type=%s\n",
|
|
osmo_cm_service_type_name(req->cm_service_type));
|
|
|
|
mi_type = (mi && mi_len) ? (mi[0] & GSM_MI_TYPE_MASK) : GSM_MI_TYPE_NONE;
|
|
switch (mi_type) {
|
|
case GSM_MI_TYPE_IMSI:
|
|
case GSM_MI_TYPE_TMSI:
|
|
/* continue below */
|
|
break;
|
|
case GSM_MI_TYPE_IMEI:
|
|
if (req->cm_service_type == GSM48_CMSERV_EMERGENCY) {
|
|
/* We don't do emergency calls by IMEI */
|
|
LOG_MSC_A(msc_a, LOGL_NOTICE, "Tx CM SERVICE REQUEST REJECT: "
|
|
"emergency services by IMEI are not supported\n");
|
|
return msc_gsm48_tx_mm_serv_rej(msc_a, GSM48_REJECT_IMEI_NOT_ACCEPTED);
|
|
}
|
|
/* fall-through for non-emergency setup */
|
|
default:
|
|
LOG_MSC_A(msc_a, LOGL_ERROR, "MI type is not expected: %s\n", gsm48_mi_type_name(mi_type));
|
|
return msc_gsm48_tx_mm_serv_rej(msc_a, GSM48_REJECT_INCORRECT_MESSAGE);
|
|
}
|
|
|
|
if (!msc_a_cm_service_type_to_use(req->cm_service_type))
|
|
return msc_gsm48_tx_mm_serv_rej(msc_a, GSM48_REJECT_SRV_OPT_NOT_SUPPORTED);
|
|
|
|
if (msc_a_is_accepted(msc_a))
|
|
return cm_serv_reuse_conn(msc_a, mi_buf, req->cm_service_type);
|
|
|
|
osmo_signal_dispatch(SS_SUBSCR, S_SUBSCR_IDENTITY, mi_buf);
|
|
|
|
msc_a_get(msc_a, msc_a_cm_service_type_to_use(req->cm_service_type));
|
|
|
|
is_utran = (msc_a->c.ran->type == OSMO_RAT_UTRAN_IU);
|
|
vlr_proc_acc_req(msc_a->c.fi,
|
|
MSC_A_EV_AUTHENTICATED, MSC_A_EV_CN_CLOSE, NULL,
|
|
net->vlr, msc_a,
|
|
VLR_PR_ARQ_T_CM_SERV_REQ,
|
|
req->cm_service_type,
|
|
mi-1, &msc_a->via_cell.lai,
|
|
is_utran || net->authentication_required,
|
|
is_utran ? net->uea_encryption : net->a5_encryption_mask > 0x01,
|
|
req->cipher_key_seq,
|
|
osmo_gsm48_classmark2_is_r99(cm2, cm2_len),
|
|
is_utran);
|
|
|
|
/* From vlr_proc_acc_req() we expect an implicit dispatch of PR_ARQ_E_START we expect
|
|
* msc_vlr_subscr_assoc() to already have been called and completed. Has an error occurred? */
|
|
vsub = msc_a_vsub(msc_a);
|
|
if (!vsub) {
|
|
LOG_MSC_A(msc_a, LOGL_ERROR, "subscriber not allowed to do a CM Service Request\n");
|
|
return -EIO;
|
|
}
|
|
|
|
vsub->classmark.classmark2 = *cm2;
|
|
vsub->classmark.classmark2_len = cm2_len;
|
|
return 0;
|
|
}
|
|
|
|
/* Receive a CM Re-establish Request */
|
|
static int gsm48_rx_cm_reest_req(struct msc_a *msc_a, struct msgb *msg)
|
|
{
|
|
uint8_t mi_type;
|
|
char mi_string[GSM48_MI_SIZE];
|
|
struct gsm48_hdr *gh = msgb_l3(msg);
|
|
|
|
uint8_t classmark2_len = gh->data[1];
|
|
uint8_t *classmark2 = gh->data+2;
|
|
uint8_t mi_len = *(classmark2 + classmark2_len);
|
|
uint8_t *mi = (classmark2 + classmark2_len + 1);
|
|
|
|
gsm48_mi_to_string(mi_string, sizeof(mi_string), mi, mi_len);
|
|
mi_type = mi[0] & GSM_MI_TYPE_MASK;
|
|
DEBUGP(DMM, "<- CM RE-ESTABLISH REQUEST MI(%s)=%s\n", gsm48_mi_type_name(mi_type), mi_string);
|
|
|
|
/* we don't support CM call re-establishment */
|
|
return msc_gsm48_tx_mm_serv_rej(msc_a, GSM48_REJECT_SRV_OPT_NOT_SUPPORTED);
|
|
}
|
|
|
|
static int gsm48_rx_mm_imsi_detach_ind(struct msc_a *msc_a, struct msgb *msg)
|
|
{
|
|
struct gsm_network *net = msc_a_net(msc_a);
|
|
struct gsm48_hdr *gh = msgb_l3(msg);
|
|
struct gsm48_imsi_detach_ind *idi =
|
|
(struct gsm48_imsi_detach_ind *) gh->data;
|
|
uint8_t mi_type = idi->mi[0] & GSM_MI_TYPE_MASK;
|
|
char mi_string[GSM48_MI_SIZE];
|
|
struct vlr_subscr *vsub = NULL;
|
|
|
|
gsm48_mi_to_string(mi_string, sizeof(mi_string), idi->mi, idi->mi_len);
|
|
DEBUGP(DMM, "IMSI DETACH INDICATION: MI(%s)=%s\n",
|
|
gsm48_mi_type_name(mi_type), mi_string);
|
|
|
|
rate_ctr_inc(&net->msc_ctrs->ctr[MSC_CTR_LOC_UPDATE_TYPE_DETACH]);
|
|
|
|
switch (mi_type) {
|
|
case GSM_MI_TYPE_TMSI:
|
|
vsub = vlr_subscr_find_by_tmsi(net->vlr,
|
|
tmsi_from_string(mi_string), __func__);
|
|
break;
|
|
case GSM_MI_TYPE_IMSI:
|
|
vsub = vlr_subscr_find_by_imsi(net->vlr, mi_string, __func__);
|
|
break;
|
|
case GSM_MI_TYPE_IMEI:
|
|
case GSM_MI_TYPE_IMEISV:
|
|
/* no sim card... FIXME: what to do ? */
|
|
LOGP(DMM, LOGL_ERROR, "MI(%s)=%s: unimplemented mobile identity type\n",
|
|
gsm48_mi_type_name(mi_type), mi_string);
|
|
break;
|
|
default:
|
|
LOGP(DMM, LOGL_ERROR, "MI(%s)=%s: unknown mobile identity type\n",
|
|
gsm48_mi_type_name(mi_type), mi_string);
|
|
break;
|
|
}
|
|
|
|
if (!vsub) {
|
|
LOGP(DMM, LOGL_ERROR, "IMSI DETACH for unknown subscriber MI(%s)=%s\n",
|
|
gsm48_mi_type_name(mi_type), mi_string);
|
|
} else {
|
|
LOGP(DMM, LOGL_INFO, "IMSI DETACH for %s\n", vlr_subscr_name(vsub));
|
|
msub_set_vsub(msc_a->c.msub, vsub);
|
|
|
|
if (vsub->cs.is_paging)
|
|
paging_expired(vsub);
|
|
|
|
vsub->classmark.classmark1 = idi->classmark1;
|
|
|
|
vlr_subscr_rx_imsi_detach(vsub);
|
|
osmo_signal_dispatch(SS_SUBSCR, S_SUBSCR_DETACHED, vsub);
|
|
vlr_subscr_put(vsub, __func__);
|
|
}
|
|
|
|
msc_a_release_cn(msc_a);
|
|
return 0;
|
|
}
|
|
|
|
static int gsm48_rx_mm_status(struct msgb *msg)
|
|
{
|
|
struct gsm48_hdr *gh = msgb_l3(msg);
|
|
|
|
DEBUGP(DMM, "MM STATUS (reject cause 0x%02x)\n", gh->data[0]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int parse_gsm_auth_resp(uint8_t *res, uint8_t *res_len,
|
|
struct msc_a *msc_a,
|
|
struct msgb *msg)
|
|
{
|
|
struct gsm48_hdr *gh = msgb_l3(msg);
|
|
struct gsm48_auth_resp *ar = (struct gsm48_auth_resp*) gh->data;
|
|
|
|
if (msgb_l3len(msg) < sizeof(*gh) + sizeof(*ar)) {
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_ERROR, "MM AUTHENTICATION RESPONSE: l3 length invalid: %u\n",
|
|
msgb_l3len(msg));
|
|
return -EINVAL;
|
|
}
|
|
|
|
*res_len = sizeof(ar->sres);
|
|
memcpy(res, ar->sres, sizeof(ar->sres));
|
|
return 0;
|
|
}
|
|
|
|
static int parse_umts_auth_resp(uint8_t *res, uint8_t *res_len,
|
|
struct msc_a *msc_a,
|
|
struct msgb *msg)
|
|
{
|
|
struct gsm48_hdr *gh;
|
|
uint8_t *data;
|
|
uint8_t iei;
|
|
uint8_t ie_len;
|
|
unsigned int data_len;
|
|
|
|
/* First parse the GSM part */
|
|
if (parse_gsm_auth_resp(res, res_len, msc_a, msg))
|
|
return -EINVAL;
|
|
OSMO_ASSERT(*res_len == 4);
|
|
|
|
/* Then add the extended res part */
|
|
gh = msgb_l3(msg);
|
|
data = gh->data + sizeof(struct gsm48_auth_resp);
|
|
data_len = msgb_l3len(msg) - (data - (uint8_t*)msgb_l3(msg));
|
|
|
|
if (data_len < 3) {
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_ERROR, "MM AUTHENTICATION RESPONSE: "
|
|
"message length=%u is too short\n", data_len);
|
|
return -EINVAL;
|
|
}
|
|
|
|
iei = data[0];
|
|
ie_len = data[1];
|
|
if (iei != GSM48_IE_AUTH_RES_EXT) {
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_ERROR, "MM R99 AUTHENTICATION RESPONSE: expected IEI 0x%02x, got 0x%02x\n",
|
|
GSM48_IE_AUTH_RES_EXT, iei);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (ie_len > 12) {
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_ERROR,
|
|
"MM R99 AUTHENTICATION RESPONSE: extended Auth Resp IE 0x%02x is too large: %u bytes\n",
|
|
GSM48_IE_AUTH_RES_EXT, ie_len);
|
|
return -EINVAL;
|
|
}
|
|
|
|
*res_len += ie_len;
|
|
memcpy(res + 4, &data[2], ie_len);
|
|
return 0;
|
|
}
|
|
|
|
/* Chapter 9.2.3: Authentication Response */
|
|
static int gsm48_rx_mm_auth_resp(struct msc_a *msc_a, struct msgb *msg)
|
|
{
|
|
uint8_t res[16];
|
|
uint8_t res_len;
|
|
int rc;
|
|
bool is_umts;
|
|
struct vlr_subscr *vsub = msc_a_vsub(msc_a);
|
|
|
|
if (!vsub) {
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_ERROR, "MM AUTHENTICATION RESPONSE: invalid: no subscriber\n");
|
|
msc_a_release_mo(msc_a, GSM_CAUSE_AUTH_FAILED);
|
|
return -EINVAL;
|
|
}
|
|
|
|
is_umts = (msgb_l3len(msg) > sizeof(struct gsm48_hdr) + sizeof(struct gsm48_auth_resp));
|
|
|
|
if (is_umts)
|
|
rc = parse_umts_auth_resp(res, &res_len, msc_a, msg);
|
|
else
|
|
rc = parse_gsm_auth_resp(res, &res_len, msc_a, msg);
|
|
|
|
if (rc) {
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_ERROR,
|
|
"MM AUTHENTICATION RESPONSE: invalid: parsing %s AKA Auth Response"
|
|
" failed with rc=%d; dispatching zero length SRES/RES to trigger failure\n",
|
|
is_umts ? "UMTS" : "GSM", rc);
|
|
memset(res, 0, sizeof(res));
|
|
res_len = 0;
|
|
}
|
|
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_DEBUG, "MM %s AUTHENTICATION RESPONSE (%s = %s)\n",
|
|
is_umts ? "UMTS" : "GSM", is_umts ? "res" : "sres",
|
|
osmo_hexdump_nospc(res, res_len));
|
|
|
|
return vlr_subscr_rx_auth_resp(vsub, osmo_gsm48_classmark_is_r99(&vsub->classmark),
|
|
msc_a->c.ran->type == OSMO_RAT_UTRAN_IU,
|
|
res, res_len);
|
|
}
|
|
|
|
static int gsm48_rx_mm_auth_fail(struct msc_a *msc_a, struct msgb *msg)
|
|
{
|
|
struct gsm48_hdr *gh = msgb_l3(msg);
|
|
uint8_t cause;
|
|
uint8_t auts_tag;
|
|
uint8_t auts_len;
|
|
uint8_t *auts;
|
|
struct vlr_subscr *vsub = msc_a_vsub(msc_a);
|
|
|
|
if (!vsub) {
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_ERROR, "MM R99 AUTHENTICATION FAILURE: invalid: no subscriber\n");
|
|
msc_a_release_mo(msc_a, GSM_CAUSE_AUTH_FAILED);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (msgb_l3len(msg) < sizeof(*gh) + 1) {
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_ERROR, "MM R99 AUTHENTICATION FAILURE: l3 length invalid: %u\n",
|
|
msgb_l3len(msg));
|
|
msc_a_release_mo(msc_a, GSM_CAUSE_AUTH_FAILED);
|
|
return -EINVAL;
|
|
}
|
|
|
|
cause = gh->data[0];
|
|
|
|
if (cause != GSM48_REJECT_SYNCH_FAILURE) {
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_INFO, "MM R99 AUTHENTICATION FAILURE: cause 0x%0x\n", cause);
|
|
vlr_subscr_rx_auth_fail(vsub, NULL);
|
|
return 0;
|
|
}
|
|
|
|
/* This is a Synch Failure procedure, which should pass an AUTS to
|
|
* resynchronize the sequence nr with the HLR. Expecting exactly one
|
|
* TLV with 14 bytes of AUTS. */
|
|
|
|
if (msgb_l3len(msg) < sizeof(*gh) + 1 + 2) {
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_INFO,
|
|
"MM R99 AUTHENTICATION FAILURE: invalid Synch Failure: missing AUTS IE\n");
|
|
msc_a_release_mo(msc_a, GSM_CAUSE_AUTH_FAILED);
|
|
return -EINVAL;
|
|
}
|
|
|
|
auts_tag = gh->data[1];
|
|
auts_len = gh->data[2];
|
|
auts = &gh->data[3];
|
|
|
|
if (auts_tag != GSM48_IE_AUTS
|
|
|| auts_len != 14) {
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_INFO,
|
|
"MM R99 AUTHENTICATION FAILURE: invalid Synch Failure:"
|
|
" expected AUTS IE 0x%02x of 14 bytes,"
|
|
" got IE 0x%02x of %u bytes\n",
|
|
GSM48_IE_AUTS, auts_tag, auts_len);
|
|
msc_a_release_mo(msc_a, GSM_CAUSE_AUTH_FAILED);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (msgb_l3len(msg) < sizeof(*gh) + 1 + 2 + auts_len) {
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_INFO,
|
|
"MM R99 AUTHENTICATION FAILURE: invalid Synch Failure msg: message truncated (%u)\n",
|
|
msgb_l3len(msg));
|
|
msc_a_release_mo(msc_a, GSM_CAUSE_AUTH_FAILED);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* We have an AUTS IE with exactly 14 bytes of AUTS and the msgb is
|
|
* large enough. */
|
|
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_DEBUG, "MM R99 AUTHENTICATION SYNCH (AUTS = %s)\n",
|
|
osmo_hexdump_nospc(auts, 14));
|
|
|
|
return vlr_subscr_rx_auth_fail(vsub, auts);
|
|
}
|
|
|
|
static int gsm48_rx_mm_tmsi_reall_compl(struct msc_a *msc_a)
|
|
{
|
|
struct vlr_subscr *vsub = msc_a_vsub(msc_a);
|
|
if (!vsub) {
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_ERROR, "Rx MM TMSI Reallocation Complete: invalid: no subscriber\n");
|
|
return -EINVAL;
|
|
}
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_DEBUG, "TMSI Reallocation Completed\n");
|
|
return vlr_subscr_rx_tmsi_reall_compl(vsub);
|
|
}
|
|
|
|
/* Receive a GSM 04.08 Mobility Management (MM) message */
|
|
int gsm0408_rcv_mm(struct msc_a *msc_a, struct msgb *msg)
|
|
{
|
|
struct gsm48_hdr *gh = msgb_l3(msg);
|
|
int rc = 0;
|
|
|
|
switch (gsm48_hdr_msg_type(gh)) {
|
|
case GSM48_MT_MM_LOC_UPD_REQUEST:
|
|
rc = mm_rx_loc_upd_req(msc_a, msg);
|
|
break;
|
|
case GSM48_MT_MM_ID_RESP:
|
|
rc = mm_rx_id_resp(msc_a, msg);
|
|
break;
|
|
case GSM48_MT_MM_CM_SERV_REQ:
|
|
rc = gsm48_rx_mm_serv_req(msc_a, msg);
|
|
break;
|
|
case GSM48_MT_MM_STATUS:
|
|
rc = gsm48_rx_mm_status(msg);
|
|
break;
|
|
case GSM48_MT_MM_TMSI_REALL_COMPL:
|
|
rc = gsm48_rx_mm_tmsi_reall_compl(msc_a);
|
|
break;
|
|
case GSM48_MT_MM_IMSI_DETACH_IND:
|
|
rc = gsm48_rx_mm_imsi_detach_ind(msc_a, msg);
|
|
break;
|
|
case GSM48_MT_MM_CM_REEST_REQ:
|
|
rc = gsm48_rx_cm_reest_req(msc_a, msg);
|
|
break;
|
|
case GSM48_MT_MM_AUTH_RESP:
|
|
rc = gsm48_rx_mm_auth_resp(msc_a, msg);
|
|
break;
|
|
case GSM48_MT_MM_AUTH_FAIL:
|
|
rc = gsm48_rx_mm_auth_fail(msc_a, msg);
|
|
break;
|
|
default:
|
|
LOGP(DMM, LOGL_NOTICE, "Unknown GSM 04.08 MM msg type 0x%02x\n",
|
|
gh->msg_type);
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* Receive a PAGING RESPONSE message from the MS */
|
|
static int gsm48_rx_rr_pag_resp(struct msc_a *msc_a, struct msgb *msg)
|
|
{
|
|
struct gsm_network *net = msc_a_net(msc_a);
|
|
struct gsm48_hdr *gh = msgb_l3(msg);
|
|
struct gsm48_pag_resp *pr =
|
|
(struct gsm48_pag_resp *)gh->data;
|
|
uint8_t classmark2_len = gh->data[1];
|
|
uint8_t *classmark2_buf = gh->data+2;
|
|
struct gsm48_classmark2 *cm2 = (void*)classmark2_buf;
|
|
uint8_t *mi_lv = classmark2_buf + classmark2_len;
|
|
bool is_utran;
|
|
struct vlr_subscr *vsub;
|
|
|
|
if (msc_a_is_establishing_auth_ciph(msc_a)) {
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_ERROR,
|
|
"Ignoring Paging Response, conn already busy establishing authenticity\n");
|
|
return 0;
|
|
}
|
|
|
|
if (msc_a_is_accepted(msc_a)) {
|
|
LOG_MSC_A_CAT(msc_a, DMM, LOGL_ERROR, "Ignoring Paging Response, conn already established\n");
|
|
return 0;
|
|
}
|
|
|
|
msc_a->complete_layer3_type = COMPLETE_LAYER3_PAGING_RESP;
|
|
msub_update_id_from_mi(msc_a->c.msub, mi_lv + 1, *mi_lv);
|
|
LOG_MSC_A_CAT(msc_a, DRR, LOGL_DEBUG, "Rx PAGING RESPONSE\n");
|
|
|
|
msc_a_get(msc_a, MSC_A_USE_PAGING_RESPONSE);
|
|
|
|
is_utran = (msc_a->c.ran->type == OSMO_RAT_UTRAN_IU);
|
|
vlr_proc_acc_req(msc_a->c.fi,
|
|
MSC_A_EV_AUTHENTICATED, MSC_A_EV_CN_CLOSE, NULL,
|
|
net->vlr, msc_a,
|
|
VLR_PR_ARQ_T_PAGING_RESP, 0, mi_lv, &msc_a->via_cell.lai,
|
|
is_utran || net->authentication_required,
|
|
is_utran ? net->uea_encryption : net->a5_encryption_mask > 0x01,
|
|
pr->key_seq,
|
|
osmo_gsm48_classmark2_is_r99(cm2, classmark2_len),
|
|
is_utran);
|
|
|
|
/* From vlr_proc_acc_req() we expect an implicit dispatch of PR_ARQ_E_START we expect
|
|
* msc_vlr_subscr_assoc() to already have been called and completed. Has an error occurred? */
|
|
vsub = msc_a_vsub(msc_a);
|
|
if (!vsub) {
|
|
LOG_MSC_A(msc_a, LOGL_ERROR, "subscriber not allowed to do a Paging Response\n");
|
|
msc_a_put(msc_a, MSC_A_USE_PAGING_RESPONSE);
|
|
return -EIO;
|
|
}
|
|
|
|
vsub->classmark.classmark2 = *cm2;
|
|
vsub->classmark.classmark2_len = classmark2_len;
|
|
return 0;
|
|
}
|
|
|
|
static int gsm48_rx_rr_ciphering_mode_complete(struct msc_a *msc_a, struct msgb *msg)
|
|
{
|
|
struct vlr_subscr *vsub = msc_a_vsub(msc_a);
|
|
struct gsm48_hdr *gh = msgb_l3(msg);
|
|
unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh);
|
|
struct tlv_parsed tp;
|
|
struct tlv_p_entry *mi;
|
|
|
|
tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0);
|
|
mi = TLVP_GET(&tp, GSM48_IE_MOBILE_ID);
|
|
|
|
if (!mi)
|
|
return 0;
|
|
|
|
LOG_MSC_A(msc_a, LOGL_DEBUG, "RR Ciphering Mode Complete contains Mobile Identity: %s\n",
|
|
osmo_mi_name(mi->val, mi->len));
|
|
|
|
if (!vsub)
|
|
return 0;
|
|
|
|
return vlr_subscr_rx_id_resp(vsub, mi->val, mi->len);
|
|
}
|
|
|
|
static int gsm48_rx_rr_app_info(struct msc_a *msc_a, struct msgb *msg)
|
|
{
|
|
struct gsm48_hdr *gh = msgb_l3(msg);
|
|
uint8_t apdu_id_flags;
|
|
uint8_t apdu_len;
|
|
uint8_t *apdu_data;
|
|
|
|
apdu_id_flags = gh->data[0];
|
|
apdu_len = gh->data[1];
|
|
apdu_data = gh->data+2;
|
|
|
|
DEBUGP(DRR, "RX APPLICATION INFO id/flags=0x%02x apdu_len=%u apdu=%s\n",
|
|
apdu_id_flags, apdu_len, osmo_hexdump(apdu_data, apdu_len));
|
|
|
|
/* we're not using the app info blob anywhere, so ignore. */
|
|
#if 0
|
|
return db_apdu_blob_store(conn->subscr, apdu_id_flags, apdu_len, apdu_data);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
/* Receive a GSM 04.08 Radio Resource (RR) message */
|
|
int gsm0408_rcv_rr(struct msc_a *msc_a, struct msgb *msg)
|
|
{
|
|
struct gsm48_hdr *gh = msgb_l3(msg);
|
|
int rc = 0;
|
|
|
|
switch (gh->msg_type) {
|
|
case GSM48_MT_RR_PAG_RESP:
|
|
rc = gsm48_rx_rr_pag_resp(msc_a, msg);
|
|
break;
|
|
case GSM48_MT_RR_CIPH_M_COMPL:
|
|
rc = gsm48_rx_rr_ciphering_mode_complete(msc_a, msg);
|
|
break;
|
|
case GSM48_MT_RR_APP_INFO:
|
|
rc = gsm48_rx_rr_app_info(msc_a, msg);
|
|
break;
|
|
default:
|
|
LOG_MSC_A_CAT(msc_a, DRR, LOGL_NOTICE, "MSC: Unimplemented %s GSM 04.08 RR "
|
|
"message\n", gsm48_rr_msg_name(gh->msg_type));
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
int gsm48_send_rr_app_info(struct msc_a *msc_a, uint8_t apdu_id,
|
|
uint8_t apdu_len, const uint8_t *apdu)
|
|
{
|
|
struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 APP INF");
|
|
struct gsm48_hdr *gh;
|
|
|
|
DEBUGP(DRR, "TX APPLICATION INFO id=0x%02x, len=%u\n",
|
|
apdu_id, apdu_len);
|
|
|
|
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 2 + apdu_len);
|
|
gh->proto_discr = GSM48_PDISC_RR;
|
|
gh->msg_type = GSM48_MT_RR_APP_INFO;
|
|
gh->data[0] = apdu_id;
|
|
gh->data[1] = apdu_len;
|
|
memcpy(gh->data+2, apdu, apdu_len);
|
|
|
|
return msc_a_tx_dtap_to_i(msc_a, msg);
|
|
}
|
|
|
|
extern int gsm0408_rcv_cc(struct msc_a *msc_a, struct msgb *msg);
|
|
|
|
/***********************************************************************
|
|
* VLR integration
|
|
***********************************************************************/
|
|
|
|
/* VLR asks us to send an authentication request */
|
|
static int msc_vlr_tx_auth_req(void *msc_conn_ref, struct vlr_auth_tuple *at,
|
|
bool send_autn)
|
|
{
|
|
struct msc_a *msc_a = msc_conn_ref;
|
|
return gsm48_tx_mm_auth_req(msc_a, at->vec.rand,
|
|
send_autn? at->vec.autn : NULL,
|
|
at->key_seq);
|
|
}
|
|
|
|
/* VLR asks us to send an authentication reject */
|
|
static int msc_vlr_tx_auth_rej(void *msc_conn_ref)
|
|
{
|
|
struct msc_a *msc_a = msc_conn_ref;
|
|
return gsm48_tx_mm_auth_rej(msc_a);
|
|
}
|
|
|
|
/* VLR asks us to transmit an Identity Request of given type */
|
|
static int msc_vlr_tx_id_req(void *msc_conn_ref, uint8_t mi_type)
|
|
{
|
|
struct msc_a *msc_a = msc_conn_ref;
|
|
return mm_tx_identity_req(msc_a, mi_type);
|
|
}
|
|
|
|
/* VLR asks us to transmit a Location Update Accept */
|
|
static int msc_vlr_tx_lu_acc(void *msc_conn_ref, uint32_t send_tmsi)
|
|
{
|
|
struct msc_a *msc_a = msc_conn_ref;
|
|
return gsm0408_loc_upd_acc(msc_a, send_tmsi);
|
|
}
|
|
|
|
/* VLR asks us to transmit a Location Update Reject */
|
|
static int msc_vlr_tx_lu_rej(void *msc_conn_ref, enum gsm48_reject_value cause)
|
|
{
|
|
struct msc_a *msc_a = msc_conn_ref;
|
|
return gsm0408_loc_upd_rej(msc_a, cause);
|
|
}
|
|
|
|
/* VLR asks us to transmit a CM Service Accept */
|
|
int msc_vlr_tx_cm_serv_acc(void *msc_conn_ref, enum osmo_cm_service_type cm_service_type)
|
|
{
|
|
struct msc_a *msc_a = msc_conn_ref;
|
|
return msc_gsm48_tx_mm_serv_ack(msc_a);
|
|
}
|
|
|
|
static int msc_vlr_tx_common_id(void *msc_conn_ref)
|
|
{
|
|
struct msc_a *msc_a = msc_conn_ref;
|
|
struct ran_msg msg = {
|
|
.msg_type = RAN_MSG_COMMON_ID,
|
|
.common_id = {
|
|
.imsi = msc_a_vsub(msc_a)->imsi,
|
|
},
|
|
};
|
|
return msc_a_ran_down(msc_a, MSC_ROLE_I, &msg);
|
|
}
|
|
|
|
/* VLR asks us to transmit MM info. */
|
|
static int msc_vlr_tx_mm_info(void *msc_conn_ref)
|
|
{
|
|
struct msc_a *msc_a = msc_conn_ref;
|
|
struct gsm_network *net = msc_a_net(msc_a);
|
|
if (!net->send_mm_info)
|
|
return 0;
|
|
return gsm48_tx_mm_info(msc_a);
|
|
}
|
|
|
|
/* VLR asks us to transmit a CM Service Reject */
|
|
static int msc_vlr_tx_cm_serv_rej(void *msc_conn_ref, enum osmo_cm_service_type cm_service_type,
|
|
enum gsm48_reject_value cause)
|
|
{
|
|
struct msc_a *msc_a = msc_conn_ref;
|
|
msc_gsm48_tx_mm_serv_rej(msc_a, cause);
|
|
msc_a_put(msc_a, msc_a_cm_service_type_to_use(cm_service_type));
|
|
return 0;
|
|
}
|
|
|
|
/* VLR informs us that the subscriber data has somehow been modified */
|
|
static void msc_vlr_subscr_update(struct vlr_subscr *subscr)
|
|
{
|
|
struct msub *msub = msub_for_vsub(subscr);
|
|
LOGVSUBP(LOGL_NOTICE, subscr, "VLR: update for IMSI=%s (MSISDN=%s)%s\n",
|
|
subscr->imsi, subscr->msisdn, msub ? "" : " (NO CONN!)");
|
|
msub_update_id(msub);
|
|
}
|
|
|
|
/* VLR informs us that the subscriber has been associated with a conn */
|
|
static int msc_vlr_subscr_assoc(void *msc_conn_ref,
|
|
struct vlr_subscr *vsub)
|
|
{
|
|
struct msc_a *msc_a = msc_conn_ref;
|
|
struct msub *msub = msc_a->c.msub;
|
|
OSMO_ASSERT(vsub);
|
|
|
|
if (msub_set_vsub(msub, vsub))
|
|
return -EINVAL;
|
|
vsub->cs.attached_via_ran = msc_a->c.ran->type;
|
|
|
|
/* In case we have already received Classmark Information before the VLR Subscriber was
|
|
* associated with the conn: merge the new Classmark into vsub->classmark. Don't overwrite valid
|
|
* vsub->classmark with unset classmark, though. */
|
|
osmo_gsm48_classmark_update(&vsub->classmark, &msc_a->temporary_classmark);
|
|
|
|
msub_update_id(msub);
|
|
|
|
osmo_fsm_inst_dispatch(msc_a->c.fi, MSC_A_EV_COMPLETE_LAYER_3_OK, NULL);
|
|
return 0;
|
|
}
|
|
|
|
/* operations that we need to implement for libvlr */
|
|
const struct vlr_ops msc_vlr_ops = {
|
|
.tx_auth_req = msc_vlr_tx_auth_req,
|
|
.tx_auth_rej = msc_vlr_tx_auth_rej,
|
|
.tx_id_req = msc_vlr_tx_id_req,
|
|
.tx_lu_acc = msc_vlr_tx_lu_acc,
|
|
.tx_lu_rej = msc_vlr_tx_lu_rej,
|
|
.tx_cm_serv_acc = msc_vlr_tx_cm_serv_acc,
|
|
.tx_cm_serv_rej = msc_vlr_tx_cm_serv_rej,
|
|
.set_ciph_mode = msc_a_vlr_set_cipher_mode,
|
|
.tx_common_id = msc_vlr_tx_common_id,
|
|
.tx_mm_info = msc_vlr_tx_mm_info,
|
|
.subscr_update = msc_vlr_subscr_update,
|
|
.subscr_assoc = msc_vlr_subscr_assoc,
|
|
};
|
|
|
|
struct msgb *gsm48_create_mm_serv_rej(enum gsm48_reject_value value)
|
|
{
|
|
struct msgb *msg;
|
|
struct gsm48_hdr *gh;
|
|
|
|
msg = gsm48_msgb_alloc_name("GSM 04.08 SERV REJ");
|
|
if (!msg)
|
|
return NULL;
|
|
|
|
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
|
|
gh->proto_discr = GSM48_PDISC_MM;
|
|
gh->msg_type = GSM48_MT_MM_CM_SERV_REJ;
|
|
gh->data[0] = value;
|
|
|
|
return msg;
|
|
}
|
|
|
|
struct msgb *gsm48_create_loc_upd_rej(uint8_t cause)
|
|
{
|
|
struct gsm48_hdr *gh;
|
|
struct msgb *msg;
|
|
|
|
msg = gsm48_msgb_alloc_name("GSM 04.08 LOC UPD REJ");
|
|
if (!msg)
|
|
return NULL;
|
|
|
|
gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
|
|
gh->proto_discr = GSM48_PDISC_MM;
|
|
gh->msg_type = GSM48_MT_MM_LOC_UPD_REJECT;
|
|
gh->data[0] = cause;
|
|
return msg;
|
|
}
|
|
|
|
int gsm48_extract_mi(uint8_t *classmark2_lv, int length, char *mi_string, uint8_t *mi_type)
|
|
{
|
|
/* Check the size for the classmark */
|
|
if (length < 1 + *classmark2_lv)
|
|
return -1;
|
|
|
|
uint8_t *mi_lv = classmark2_lv + *classmark2_lv + 1;
|
|
if (length < 2 + *classmark2_lv + mi_lv[0])
|
|
return -2;
|
|
|
|
*mi_type = mi_lv[1] & GSM_MI_TYPE_MASK;
|
|
return gsm48_mi_to_string(mi_string, GSM48_MI_SIZE, mi_lv+1, *mi_lv);
|
|
}
|
|
|
|
int gsm48_paging_extract_mi(struct gsm48_pag_resp *resp, int length,
|
|
char *mi_string, uint8_t *mi_type)
|
|
{
|
|
static const uint32_t classmark_offset =
|
|
offsetof(struct gsm48_pag_resp, classmark2);
|
|
uint8_t *classmark2_lv = (uint8_t *) &resp->classmark2;
|
|
return gsm48_extract_mi(classmark2_lv, length - classmark_offset,
|
|
mi_string, mi_type);
|
|
}
|