Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 1 | /* (C) 2018-2019 by sysmocom s.f.m.c. GmbH |
| 2 | * All Rights Reserved |
| 3 | * |
| 4 | * Author: Harald Welte, Philipp Maier |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU Affero General Public License as published by |
| 8 | * the Free Software Foundation; either version 3 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU Affero General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Affero General Public License |
| 17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 18 | * |
| 19 | */ |
| 20 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 21 | #include <errno.h> |
| 22 | |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 23 | #include <osmocom/core/utils.h> |
| 24 | #include <osmocom/core/fsm.h> |
| 25 | #include <osmocom/msc/debug.h> |
| 26 | #include <osmocom/msc/vlr.h> |
| 27 | #include <osmocom/msc/vlr_sgs.h> |
| 28 | #include "vlr_sgs_fsm.h" |
| 29 | |
| 30 | const struct value_string sgs_state_timer_names[] = { |
| 31 | {SGS_STATE_TS5, "Ts5"}, |
| 32 | {SGS_STATE_TS6_2, "Ts6-2"}, |
| 33 | {SGS_STATE_TS7, "Ts7"}, |
| 34 | {SGS_STATE_TS11, "Ts11"}, |
| 35 | {SGS_STATE_TS14, "Ts14"}, |
| 36 | {SGS_STATE_TS15, "Ts15"}, |
| 37 | {0, NULL} |
| 38 | }; |
| 39 | |
| 40 | const struct value_string sgs_state_counter_names[] = { |
| 41 | {SGS_STATE_NS7, "Ns7"}, |
| 42 | {SGS_STATE_NS11, "Ns11"}, |
| 43 | {0, NULL} |
| 44 | }; |
| 45 | |
| 46 | /* Reset all SGs-Associations back to zero. |
Martin Hauke | 3f07dac | 2019-11-14 17:49:08 +0100 | [diff] [blame] | 47 | * \param[in] vlr VLR instance. */ |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 48 | void vlr_sgs_reset(struct vlr_instance *vlr) |
| 49 | { |
| 50 | struct vlr_subscr *vsub; |
| 51 | |
| 52 | OSMO_ASSERT(vlr); |
| 53 | |
| 54 | LOGP(DVLR, LOGL_INFO, "dropping all SGs associations.\n"); |
| 55 | |
| 56 | llist_for_each_entry(vsub, &vlr->subscribers, list) { |
| 57 | osmo_fsm_inst_dispatch(vsub->sgs_fsm, SGS_UE_E_RX_RESET_FROM_MME, NULL); |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | /*! Perform an SGs location update. |
Martin Hauke | 3f07dac | 2019-11-14 17:49:08 +0100 | [diff] [blame] | 62 | * \param[in] vlr VLR instance. |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 63 | * \param[in] cfg SGs interface configuration parameters. |
Martin Hauke | 3f07dac | 2019-11-14 17:49:08 +0100 | [diff] [blame] | 64 | * \param[in] response_cb callback function that is called when LU is done. |
| 65 | * \param[in] paging_cb callback function that is called when LU needs to page. |
| 66 | * \param[in] mminfo_cb callback function that is called to provide MM info to the UE. |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 67 | * \param[in] mme_name fqdn of the requesting MME (mme-name). |
| 68 | * \param[in] type location update type (normal or IMSI attach). |
| 69 | * \param[in] imsi mobile identity (IMSI). |
| 70 | * \param[in] new_lai identifier of the new location area. |
Pau Espin Pedrol | 6710670 | 2021-04-27 18:20:15 +0200 | [diff] [blame] | 71 | * \param[in] last_eutran_plnm_id Last E-UTRAN PLMN ID (can be NULL). |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 72 | * \returns 0 in case of success, -EINVAL in case of error. */ |
| 73 | int vlr_sgs_loc_update(struct vlr_instance *vlr, struct vlr_sgs_cfg *cfg, |
| 74 | vlr_sgs_lu_response_cb_t response_cb, vlr_sgs_lu_paging_cb_t paging_cb, |
| 75 | vlr_sgs_lu_mminfo_cb_t mminfo_cb, char *mme_name, enum vlr_lu_type type, const char *imsi, |
Pau Espin Pedrol | 6710670 | 2021-04-27 18:20:15 +0200 | [diff] [blame] | 76 | struct osmo_location_area_id *new_lai, struct osmo_plmn_id *last_eutran_plmn) |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 77 | { |
| 78 | struct vlr_subscr *vsub = NULL; |
| 79 | |
| 80 | OSMO_ASSERT(response_cb); |
| 81 | OSMO_ASSERT(paging_cb); |
| 82 | OSMO_ASSERT(mminfo_cb); |
| 83 | OSMO_ASSERT(cfg); |
| 84 | OSMO_ASSERT(imsi); |
| 85 | |
Pau Espin Pedrol | 017ba1f | 2021-08-24 14:56:03 +0200 | [diff] [blame] | 86 | vsub = vlr_subscr_find_or_create_by_imsi(vlr, imsi, VSUB_USE_SGS_LU, NULL); |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 87 | if (!vsub) { |
| 88 | LOGP(DSGS, LOGL_ERROR, "VLR subscriber allocation failed\n"); |
| 89 | return -EINVAL; |
| 90 | } |
| 91 | |
| 92 | vsub->sgs.cfg = *cfg; |
| 93 | vsub->sgs.response_cb = response_cb; |
| 94 | vsub->sgs.paging_cb = paging_cb; |
| 95 | vsub->sgs.mminfo_cb = mminfo_cb; |
| 96 | vlr_subscr_set_imsi(vsub, imsi); |
Pau Espin Pedrol | 6710670 | 2021-04-27 18:20:15 +0200 | [diff] [blame] | 97 | vlr_subscr_set_last_used_eutran_plmn_id(vsub, last_eutran_plmn); |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 98 | osmo_strlcpy(vsub->sgs.mme_name, mme_name, sizeof(vsub->sgs.mme_name)); |
| 99 | |
| 100 | osmo_fsm_inst_dispatch(vsub->sgs_fsm, SGS_UE_E_RX_LU_FROM_MME, NULL); |
| 101 | |
| 102 | /* FIXME: Use the "type" type parameter (for what is it useful?) */ |
| 103 | |
| 104 | vsub->sgs.lai = *new_lai; |
| 105 | vsub->cgi.lai = *new_lai; |
| 106 | vsub->cs.lac = vsub->sgs.lai.lac; |
| 107 | |
Philipp Maier | 4826465 | 2019-04-02 16:58:59 +0200 | [diff] [blame] | 108 | /* Subscribers that are created by the SGs location update will not |
| 109 | * expire automatically, however a 2G LU or an implicit IMSI detach |
| 110 | * from EPS services may change this. */ |
| 111 | vsub->expire_lu = VLR_SUBSCRIBER_NO_EXPIRATION; |
| 112 | |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | /*! Notify that the SGs Location Update accept message has been sent to MME. |
| 117 | * \param[in] vsub VLR subscriber. */ |
| 118 | void vlr_sgs_loc_update_acc_sent(struct vlr_subscr *vsub) |
| 119 | { |
| 120 | osmo_fsm_inst_dispatch(vsub->sgs_fsm, SGS_UE_E_TX_LU_ACCEPT, NULL); |
| 121 | |
Pau Espin Pedrol | 017ba1f | 2021-08-24 14:56:03 +0200 | [diff] [blame] | 122 | /* Balance vlr_subscr_find_or_create_by_imsi() in vlr_sgs_loc_update() */ |
| 123 | vlr_subscr_put(vsub, VSUB_USE_SGS_LU); |
| 124 | |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 125 | /* FIXME: At this point we need to check the status of Ts5 and if |
| 126 | * it is still running this means the LU has interrupted the paging, |
| 127 | * and we need to start paging again. 3GPP TS 29.118, |
| 128 | * chapter 5.2.3.2 */ |
| 129 | } |
| 130 | |
| 131 | /*! Notify that the SGs Location Update reject message has been sent to MME. |
| 132 | * \param[in] vsub VLR subscriber. */ |
| 133 | void vlr_sgs_loc_update_rej_sent(struct vlr_subscr *vsub) |
| 134 | { |
| 135 | osmo_fsm_inst_dispatch(vsub->sgs_fsm, SGS_UE_E_TX_LU_REJECT, NULL); |
Pau Espin Pedrol | 017ba1f | 2021-08-24 14:56:03 +0200 | [diff] [blame] | 136 | /* Balance vlr_subscr_find_or_create_by_imsi() in vlr_sgs_loc_update() */ |
| 137 | vlr_subscr_put(vsub, VSUB_USE_SGS_LU); |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | /*! Perform an SGs IMSI detach. |
| 141 | * \param[in] vsub VLR subscriber. |
| 142 | * \param[in] imsi mobile identity (IMSI). |
| 143 | * \param[in] type datach type. */ |
| 144 | void vlr_sgs_imsi_detach(struct vlr_instance *vlr, const char *imsi, enum sgsap_imsi_det_noneps_type type) |
| 145 | { |
| 146 | struct vlr_subscr *vsub; |
| 147 | enum sgs_ue_fsm_event evt; |
Philipp Maier | 0803d88 | 2019-04-02 16:07:13 +0200 | [diff] [blame] | 148 | |
Neels Hofmeyr | 7c5346c | 2019-02-19 02:36:35 +0100 | [diff] [blame] | 149 | vsub = vlr_subscr_find_by_imsi(vlr, imsi, __func__); |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 150 | if (!vsub) |
| 151 | return; |
| 152 | |
Philipp Maier | 0803d88 | 2019-04-02 16:07:13 +0200 | [diff] [blame] | 153 | /* See also: 3GPP TS 29.118, 5.6.3 Procedures in the VLR: In case of |
| 154 | * an implicit detach, we are supposed to check if the state of the |
| 155 | * SGs-association, and only when it is not SGs-NULL, we may proceed. */ |
Pau Espin Pedrol | 25b3ffb | 2021-08-24 14:14:57 +0200 | [diff] [blame] | 156 | if (vsub->sgs_fsm->state == SGS_UE_ST_NULL && type == SGSAP_ID_NONEPS_T_IMPLICIT_UE_EPS_NONEPS) { |
| 157 | vlr_subscr_put(vsub, __func__); |
Philipp Maier | 0803d88 | 2019-04-02 16:07:13 +0200 | [diff] [blame] | 158 | return; |
Pau Espin Pedrol | 25b3ffb | 2021-08-24 14:14:57 +0200 | [diff] [blame] | 159 | } |
Philipp Maier | 0803d88 | 2019-04-02 16:07:13 +0200 | [diff] [blame] | 160 | |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 161 | switch (type) { |
| 162 | case SGSAP_ID_NONEPS_T_EXPLICIT_UE_NONEPS: |
| 163 | evt = SGS_UE_E_RX_DETACH_IND_FROM_UE; |
| 164 | break; |
| 165 | case SGSAP_ID_NONEPS_T_COMBINED_UE_EPS_NONEPS: |
| 166 | case SGSAP_ID_NONEPS_T_IMPLICIT_UE_EPS_NONEPS: |
| 167 | /* FIXME: Is that right? */ |
| 168 | evt = SGS_UE_E_RX_DETACH_IND_FROM_MME; |
| 169 | break; |
| 170 | default: |
| 171 | LOGP(DSGS, LOGL_ERROR, "(sub %s) invalid SGS IMSI detach type, detaching anyway...\n", |
| 172 | vlr_subscr_msisdn_or_name(vsub)); |
| 173 | evt = SGS_UE_E_RX_DETACH_IND_FROM_MME; |
| 174 | break; |
| 175 | } |
| 176 | |
| 177 | osmo_fsm_inst_dispatch(vsub->sgs_fsm, evt, NULL); |
Philipp Maier | 0803d88 | 2019-04-02 16:07:13 +0200 | [diff] [blame] | 178 | |
| 179 | /* Detaching from non EPS services essentially means that the |
| 180 | * subscriber is detached from 2G. In any case the VLR will |
| 181 | * get rid of the subscriber. */ |
| 182 | vlr_subscr_expire(vsub); |
Neels Hofmeyr | 7c5346c | 2019-02-19 02:36:35 +0100 | [diff] [blame] | 183 | vlr_subscr_put(vsub, __func__); |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 184 | } |
| 185 | |
| 186 | /*! Perform an SGs EPS detach. |
| 187 | * \param[in] vsub VLR subscriber. |
| 188 | * \param[in] imsi mobile identity (IMSI). |
| 189 | * \param[in] type datach type. */ |
| 190 | void vlr_sgs_eps_detach(struct vlr_instance *vlr, const char *imsi, enum sgsap_imsi_det_eps_type type) |
| 191 | { |
| 192 | struct vlr_subscr *vsub; |
| 193 | enum sgs_ue_fsm_event evt; |
Neels Hofmeyr | 7c5346c | 2019-02-19 02:36:35 +0100 | [diff] [blame] | 194 | vsub = vlr_subscr_find_by_imsi(vlr, imsi, __func__); |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 195 | if (!vsub) |
| 196 | return; |
| 197 | |
| 198 | switch (type) { |
| 199 | case SGSAP_ID_EPS_T_NETWORK_INITIATED: |
| 200 | evt = SGS_UE_E_RX_DETACH_IND_FROM_MME; |
| 201 | break; |
| 202 | case SGSAP_ID_EPS_T_UE_INITIATED: |
| 203 | evt = SGS_UE_E_RX_DETACH_IND_FROM_UE; |
| 204 | break; |
| 205 | case SGSAP_ID_EPS_T_EPS_NOT_ALLOWED: |
| 206 | evt = SGS_UE_E_RX_DETACH_IND_FROM_MME; |
| 207 | break; |
| 208 | default: |
| 209 | LOGP(DSGS, LOGL_ERROR, "(sub %s) invalid SGS IMSI detach type, detaching anyway...\n", |
| 210 | vlr_subscr_msisdn_or_name(vsub)); |
| 211 | evt = SGS_UE_E_RX_DETACH_IND_FROM_MME; |
| 212 | break; |
| 213 | } |
| 214 | |
| 215 | osmo_fsm_inst_dispatch(vsub->sgs_fsm, evt, NULL); |
Philipp Maier | 4826465 | 2019-04-02 16:58:59 +0200 | [diff] [blame] | 216 | |
| 217 | /* See also 3GPP TS 29.118, 5.4.3 Procedures in the VLR. Detaching from |
| 218 | * EPS services essentially means that the subscriber leaves the 4G RAN |
| 219 | * but continues to live on 2G, this basically turns the subscriber into |
| 220 | * a normal 2G subscriber and we need to make sure that the lu- |
| 221 | * expiration timer is running. */ |
| 222 | if (vsub->expire_lu == VLR_SUBSCRIBER_NO_EXPIRATION) |
| 223 | vlr_subscr_enable_expire_lu(vsub); |
| 224 | |
Neels Hofmeyr | 7c5346c | 2019-02-19 02:36:35 +0100 | [diff] [blame] | 225 | vlr_subscr_put(vsub, __func__); |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 226 | } |
| 227 | |
| 228 | /*! Perform an SGs TMSI reallocation complete. |
| 229 | * \param[in] vsub VLR subscriber. |
| 230 | * \param[in] imsi mobile identity (IMSI). */ |
| 231 | void vlr_sgs_tmsi_reall_compl(struct vlr_instance *vlr, const char *imsi) |
| 232 | { |
| 233 | struct vlr_subscr *vsub; |
Neels Hofmeyr | 7c5346c | 2019-02-19 02:36:35 +0100 | [diff] [blame] | 234 | vsub = vlr_subscr_find_by_imsi(vlr, imsi, __func__); |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 235 | if (!vsub) |
| 236 | return; |
| 237 | |
| 238 | osmo_fsm_inst_dispatch(vsub->sgs_fsm, SGS_UE_E_RX_TMSI_REALLOC, NULL); |
Neels Hofmeyr | 7c5346c | 2019-02-19 02:36:35 +0100 | [diff] [blame] | 239 | vlr_subscr_put(vsub, __func__); |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 240 | } |
| 241 | |
| 242 | /*! Notify that an SGs paging has been rejected by the MME. |
| 243 | * \param[in] vsub VLR subscriber. |
| 244 | * \param[in] imsi mobile identity (IMSI). |
| 245 | * \param[in] cause SGs cause code. */ |
| 246 | void vlr_sgs_pag_rej(struct vlr_instance *vlr, const char *imsi, enum sgsap_sgs_cause cause) |
| 247 | { |
| 248 | struct vlr_subscr *vsub; |
Neels Hofmeyr | 7c5346c | 2019-02-19 02:36:35 +0100 | [diff] [blame] | 249 | vsub = vlr_subscr_find_by_imsi(vlr, imsi, __func__); |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 250 | if (!vsub) |
| 251 | return; |
| 252 | |
| 253 | /* On the reception of a paging rej the VLR is supposed to stop Ts5, |
| 254 | also 3GPP TS 29.118, chapter 5.1.2.4 */ |
| 255 | osmo_timer_del(&vsub->sgs.Ts5); |
| 256 | LOGP(DSGS, LOGL_DEBUG, "(sub %s) Paging via SGs interface rejected by MME, %s stopped, cause: %s!\n", |
| 257 | vlr_subscr_msisdn_or_name(vsub), vlr_sgs_state_timer_name(SGS_STATE_TS5), sgsap_sgs_cause_name(cause)); |
| 258 | |
| 259 | osmo_fsm_inst_dispatch(vsub->sgs_fsm, SGS_UE_E_RX_PAGING_FAILURE, &cause); |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 260 | /* Balance ref count increment from vlr_sgs_pag() */ |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 261 | vlr_subscr_put(vsub, VSUB_USE_SGS_PAGING_REQ); |
Neels Hofmeyr | 7c5346c | 2019-02-19 02:36:35 +0100 | [diff] [blame] | 262 | |
| 263 | vlr_subscr_put(vsub, __func__); |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 264 | } |
| 265 | |
| 266 | /*! Notify that an SGs paging has been accepted by the MME. |
| 267 | * \param[in] vsub VLR subscriber. |
| 268 | * \param[in] imsi mobile identity (IMSI). */ |
| 269 | void vlr_sgs_pag_ack(struct vlr_instance *vlr, const char *imsi) |
| 270 | { |
| 271 | struct vlr_subscr *vsub; |
Neels Hofmeyr | 7c5346c | 2019-02-19 02:36:35 +0100 | [diff] [blame] | 272 | vsub = vlr_subscr_find_by_imsi(vlr, imsi, __func__); |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 273 | if (!vsub) |
| 274 | return; |
| 275 | |
| 276 | /* Stop Ts5 and and consider the paging as successful */ |
| 277 | osmo_timer_del(&vsub->sgs.Ts5); |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 278 | /* Balance ref count increment from vlr_sgs_pag() */ |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 279 | vlr_subscr_put(vsub, VSUB_USE_SGS_PAGING_REQ); |
Neels Hofmeyr | 7c5346c | 2019-02-19 02:36:35 +0100 | [diff] [blame] | 280 | |
| 281 | vlr_subscr_put(vsub, __func__); |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 282 | } |
| 283 | |
| 284 | /*! Notify that the UE has been marked as unreachable by the MME. |
| 285 | * \param[in] vsub VLR subscriber. |
| 286 | * \param[in] imsi mobile identity (IMSI). |
| 287 | * \param[in] cause SGs cause code. */ |
| 288 | void vlr_sgs_ue_unr(struct vlr_instance *vlr, const char *imsi, enum sgsap_sgs_cause cause) |
| 289 | { |
| 290 | struct vlr_subscr *vsub; |
Neels Hofmeyr | 7c5346c | 2019-02-19 02:36:35 +0100 | [diff] [blame] | 291 | vsub = vlr_subscr_find_by_imsi(vlr, imsi, __func__); |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 292 | if (!vsub) |
| 293 | return; |
| 294 | |
| 295 | /* On the reception of an UE unreachable the VLR is supposed to stop |
| 296 | * Ts5, also 3GPP TS 29.118, chapter 5.1.2.5 */ |
| 297 | osmo_timer_del(&vsub->sgs.Ts5); |
| 298 | LOGP(DSGS, LOGL_DEBUG, |
| 299 | "(sub %s) Paging via SGs interface not possible, UE unreachable, %s stopped, cause: %s\n", |
| 300 | vlr_subscr_msisdn_or_name(vsub), vlr_sgs_state_timer_name(SGS_STATE_TS5), sgsap_sgs_cause_name(cause)); |
| 301 | |
| 302 | osmo_fsm_inst_dispatch(vsub->sgs_fsm, SGS_UE_E_RX_SGSAP_UE_UNREACHABLE, &cause); |
Neels Hofmeyr | 7c5346c | 2019-02-19 02:36:35 +0100 | [diff] [blame] | 303 | vlr_subscr_put(vsub, __func__); |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 304 | } |
| 305 | |
| 306 | /* Callback function that is called when an SGs paging request times out */ |
| 307 | static void Ts5_timeout_cb(void *arg) |
| 308 | { |
| 309 | struct vlr_subscr *vsub = arg; |
| 310 | |
Martin Hauke | 3f07dac | 2019-11-14 17:49:08 +0100 | [diff] [blame] | 311 | /* 3GPP TS 29.118 does not specify a specific action that has to happen |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 312 | * in case Ts5 times out. The timeout just indicates that the paging |
| 313 | * failed. Other actions may check the status of Ts5 to see if a paging |
| 314 | * is still ongoing or not. */ |
| 315 | |
| 316 | LOGP(DSGS, LOGL_ERROR, "(sub %s) Paging via SGs interface timed out (%s expired)!\n", |
| 317 | vlr_subscr_msisdn_or_name(vsub), vlr_sgs_state_timer_name(SGS_STATE_TS5)); |
| 318 | |
| 319 | /* Balance ref count increment from vlr_sgs_pag() */ |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 320 | vlr_subscr_put(vsub, VSUB_USE_SGS_PAGING_REQ); |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 321 | |
| 322 | return; |
| 323 | } |
| 324 | |
| 325 | /*! Notify that a paging message has been sent and a paging is now in progress. |
| 326 | * \param[in] vsub VLR subscriber. */ |
| 327 | void vlr_sgs_pag(struct vlr_subscr *vsub, enum sgsap_service_ind serv_ind) |
| 328 | { |
| 329 | |
| 330 | /* In cases where we have to respawn a paging after an intermitted LU, |
| 331 | * there may e a Ts5 still running. In those cases we have to remove |
| 332 | * the old timer first */ |
| 333 | if (osmo_timer_pending(&vsub->sgs.Ts5)) |
| 334 | osmo_timer_del(&vsub->sgs.Ts5); |
| 335 | |
| 336 | /* Note: 3GPP TS 29.118, chapter 4.2.2 mentions paging in the FSM |
| 337 | * diagram, but paging never causes a state transition except when |
| 338 | * an explicit failure is indicated (MME actively rejects paging). |
Martin Hauke | 3f07dac | 2019-11-14 17:49:08 +0100 | [diff] [blame] | 339 | * Apparently it is also possible that an LU happens while the paging |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 340 | * is still ongoing and Ts5 is running. (chapter 5.1.2.3). This means |
| 341 | * that the paging procedure is intended to run in parallel to the |
| 342 | * SGs FSM and given that the benaviour around Ts5 must be implemented |
| 343 | * also separately, to emphasize this separation Ts5 is implemented |
| 344 | * here in and not in vlr_sgs_fsm.c. */ |
| 345 | osmo_timer_setup(&vsub->sgs.Ts5, Ts5_timeout_cb, vsub); |
| 346 | osmo_timer_schedule(&vsub->sgs.Ts5, vsub->sgs.cfg.timer[SGS_STATE_TS5], 0); |
| 347 | |
| 348 | /* Formally 3GPP TS 29.118 defines the sending of a paging request |
| 349 | * as an event, but as far as the VLR is concerned only Ts5 is |
| 350 | * started. */ |
| 351 | osmo_fsm_inst_dispatch(vsub->sgs_fsm, SGS_UE_E_TX_PAGING, NULL); |
| 352 | |
| 353 | /* Memorize service type in for the case that the paging must be |
| 354 | * respawned after an LU */ |
| 355 | vsub->sgs.paging_serv_ind = serv_ind; |
| 356 | |
| 357 | /* Ensure that the reference count is increased by one while the |
| 358 | * paging is happening. We will balance this again in vlr_sgs_pag_rej() |
| 359 | * and vlr_sgs_pag_ack(); */ |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 360 | vlr_subscr_get(vsub, VSUB_USE_SGS_PAGING_REQ); |
Harald Welte | 0df904d | 2018-12-03 11:00:04 +0100 | [diff] [blame] | 361 | } |
| 362 | |
| 363 | /*! Check if the SGs interface is currently paging |
| 364 | * \param[in] vsub VLR subscriber. */ |
| 365 | bool vlr_sgs_pag_pend(struct vlr_subscr *vsub) |
| 366 | { |
| 367 | return osmo_timer_pending(&vsub->sgs.Ts5); |
| 368 | } |