Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 1 | /* OsmoHLR SS/USSD implementation */ |
Harald Welte | 4956ae1 | 2018-06-15 22:04:28 +0200 | [diff] [blame] | 2 | |
| 3 | /* (C) 2018 Harald Welte <laforge@gnumonks.org> |
| 4 | * |
| 5 | * All Rights Reserved |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU Affero General Public License as published by |
| 9 | * the Free Software Foundation; either version 3 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU Affero General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Affero General Public License |
| 18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | |
| 23 | #include <osmocom/core/talloc.h> |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 24 | #include <osmocom/core/timer.h> |
| 25 | #include <osmocom/gsm/gsup.h> |
| 26 | #include <osmocom/gsm/gsm0480.h> |
| 27 | #include <osmocom/gsm/protocol/gsm_04_80.h> |
Harald Welte | 4956ae1 | 2018-06-15 22:04:28 +0200 | [diff] [blame] | 28 | #include <stdint.h> |
| 29 | #include <string.h> |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 30 | #include <errno.h> |
Harald Welte | 4956ae1 | 2018-06-15 22:04:28 +0200 | [diff] [blame] | 31 | |
| 32 | #include "hlr.h" |
| 33 | #include "hlr_ussd.h" |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 34 | #include "gsup_server.h" |
| 35 | #include "gsup_router.h" |
| 36 | #include "logging.h" |
Neels Hofmeyr | f1fe94c | 2019-04-02 04:26:55 +0200 | [diff] [blame^] | 37 | #include "db.h" |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 38 | |
| 39 | /*********************************************************************** |
| 40 | * core data structures expressing config from VTY |
| 41 | ***********************************************************************/ |
Harald Welte | 4956ae1 | 2018-06-15 22:04:28 +0200 | [diff] [blame] | 42 | |
| 43 | struct hlr_euse *euse_find(struct hlr *hlr, const char *name) |
| 44 | { |
| 45 | struct hlr_euse *euse; |
| 46 | |
| 47 | llist_for_each_entry(euse, &hlr->euse_list, list) { |
| 48 | if (!strcmp(euse->name, name)) |
| 49 | return euse; |
| 50 | } |
| 51 | return NULL; |
| 52 | } |
| 53 | |
| 54 | struct hlr_euse *euse_alloc(struct hlr *hlr, const char *name) |
| 55 | { |
| 56 | struct hlr_euse *euse = euse_find(hlr, name); |
| 57 | if (euse) |
| 58 | return NULL; |
| 59 | |
| 60 | euse = talloc_zero(hlr, struct hlr_euse); |
| 61 | euse->name = talloc_strdup(euse, name); |
| 62 | euse->hlr = hlr; |
Harald Welte | 4956ae1 | 2018-06-15 22:04:28 +0200 | [diff] [blame] | 63 | llist_add_tail(&euse->list, &hlr->euse_list); |
| 64 | |
| 65 | return euse; |
| 66 | } |
| 67 | |
| 68 | void euse_del(struct hlr_euse *euse) |
| 69 | { |
| 70 | llist_del(&euse->list); |
| 71 | talloc_free(euse); |
| 72 | } |
| 73 | |
| 74 | |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 75 | struct hlr_ussd_route *ussd_route_find_prefix(struct hlr *hlr, const char *prefix) |
Harald Welte | 4956ae1 | 2018-06-15 22:04:28 +0200 | [diff] [blame] | 76 | { |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 77 | struct hlr_ussd_route *rt; |
Harald Welte | 4956ae1 | 2018-06-15 22:04:28 +0200 | [diff] [blame] | 78 | |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 79 | llist_for_each_entry(rt, &hlr->ussd_routes, list) { |
Harald Welte | 4956ae1 | 2018-06-15 22:04:28 +0200 | [diff] [blame] | 80 | if (!strcmp(rt->prefix, prefix)) |
| 81 | return rt; |
| 82 | } |
| 83 | return NULL; |
| 84 | } |
| 85 | |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 86 | struct hlr_ussd_route *ussd_route_prefix_alloc_int(struct hlr *hlr, const char *prefix, |
| 87 | const struct hlr_iuse *iuse) |
Harald Welte | 4956ae1 | 2018-06-15 22:04:28 +0200 | [diff] [blame] | 88 | { |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 89 | struct hlr_ussd_route *rt; |
Harald Welte | 4956ae1 | 2018-06-15 22:04:28 +0200 | [diff] [blame] | 90 | |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 91 | if (ussd_route_find_prefix(hlr, prefix)) |
Harald Welte | 4956ae1 | 2018-06-15 22:04:28 +0200 | [diff] [blame] | 92 | return NULL; |
| 93 | |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 94 | rt = talloc_zero(hlr, struct hlr_ussd_route); |
Harald Welte | 4956ae1 | 2018-06-15 22:04:28 +0200 | [diff] [blame] | 95 | rt->prefix = talloc_strdup(rt, prefix); |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 96 | rt->u.iuse = iuse; |
| 97 | llist_add_tail(&rt->list, &hlr->ussd_routes); |
Harald Welte | 4956ae1 | 2018-06-15 22:04:28 +0200 | [diff] [blame] | 98 | |
| 99 | return rt; |
| 100 | } |
| 101 | |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 102 | struct hlr_ussd_route *ussd_route_prefix_alloc_ext(struct hlr *hlr, const char *prefix, |
| 103 | struct hlr_euse *euse) |
| 104 | { |
| 105 | struct hlr_ussd_route *rt; |
| 106 | |
| 107 | if (ussd_route_find_prefix(hlr, prefix)) |
| 108 | return NULL; |
| 109 | |
| 110 | rt = talloc_zero(hlr, struct hlr_ussd_route); |
| 111 | rt->prefix = talloc_strdup(rt, prefix); |
| 112 | rt->is_external = true; |
| 113 | rt->u.euse = euse; |
| 114 | llist_add_tail(&rt->list, &hlr->ussd_routes); |
| 115 | |
| 116 | return rt; |
| 117 | } |
| 118 | |
| 119 | void ussd_route_del(struct hlr_ussd_route *rt) |
Harald Welte | 4956ae1 | 2018-06-15 22:04:28 +0200 | [diff] [blame] | 120 | { |
| 121 | llist_del(&rt->list); |
| 122 | talloc_free(rt); |
| 123 | } |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 124 | |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 125 | static struct hlr_ussd_route *ussd_route_lookup_7bit(struct hlr *hlr, const char *ussd_code) |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 126 | { |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 127 | struct hlr_ussd_route *rt; |
| 128 | llist_for_each_entry(rt, &hlr->ussd_routes, list) { |
| 129 | if (!strncmp(ussd_code, rt->prefix, strlen(rt->prefix))) { |
Vadim Yanitskiy | e6c839e | 2018-08-02 23:59:51 +0700 | [diff] [blame] | 130 | LOGP(DSS, LOGL_DEBUG, "Found %s '%s' (prefix '%s') for USSD " |
| 131 | "Code '%s'\n", rt->is_external ? "EUSE" : "IUSE", |
| 132 | rt->is_external ? rt->u.euse->name : rt->u.iuse->name, |
| 133 | rt->prefix, ussd_code); |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 134 | return rt; |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 135 | } |
| 136 | } |
| 137 | |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 138 | LOGP(DSS, LOGL_DEBUG, "Could not find Route for USSD Code '%s'\n", ussd_code); |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 139 | return NULL; |
| 140 | } |
| 141 | |
| 142 | /*********************************************************************** |
| 143 | * handling functions for individual GSUP messages |
| 144 | ***********************************************************************/ |
| 145 | |
Harald Welte | 97bfb65 | 2018-07-29 12:28:11 +0200 | [diff] [blame] | 146 | #define LOGPSS(ss, lvl, fmt, args...) \ |
Harald Welte | 95b96d4 | 2018-07-29 12:47:39 +0200 | [diff] [blame] | 147 | LOGP(DSS, lvl, "%s/0x%08x: " fmt, (ss)->imsi, (ss)->session_id, ## args) |
Harald Welte | 97bfb65 | 2018-07-29 12:28:11 +0200 | [diff] [blame] | 148 | |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 149 | struct ss_session { |
| 150 | /* link us to hlr->ss_sessions */ |
| 151 | struct llist_head list; |
| 152 | /* imsi of this session */ |
| 153 | char imsi[GSM23003_IMSI_MAX_DIGITS+2]; |
| 154 | /* ID of this session (unique per IMSI) */ |
| 155 | uint32_t session_id; |
| 156 | /* state of the session */ |
| 157 | enum osmo_gsup_session_state state; |
| 158 | /* time-out when we will delete the session */ |
| 159 | struct osmo_timer_list timeout; |
| 160 | |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 161 | /* is this USSD for an external handler (EUSE): true */ |
| 162 | bool is_external; |
| 163 | union { |
| 164 | /* external USSD Entity responsible for this session */ |
| 165 | struct hlr_euse *euse; |
| 166 | /* internal USSD Entity responsible for this session */ |
| 167 | const struct hlr_iuse *iuse; |
| 168 | } u; |
| 169 | |
Neels Hofmeyr | f1fe94c | 2019-04-02 04:26:55 +0200 | [diff] [blame^] | 170 | /* subscriber's vlr_number, will be looked up once per session and cached here */ |
| 171 | char vlr_number[32]; |
| 172 | |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 173 | /* we don't keep a pointer to the osmo_gsup_{route,conn} towards the MSC/VLR here, |
| 174 | * as this might change during inter-VLR hand-over, and we simply look-up the serving MSC/VLR |
| 175 | * every time we receive an USSD component from the EUSE */ |
| 176 | }; |
| 177 | |
| 178 | struct ss_session *ss_session_find(struct hlr *hlr, const char *imsi, uint32_t session_id) |
| 179 | { |
| 180 | struct ss_session *ss; |
| 181 | llist_for_each_entry(ss, &hlr->ss_sessions, list) { |
| 182 | if (!strcmp(ss->imsi, imsi) && ss->session_id == session_id) |
| 183 | return ss; |
| 184 | } |
| 185 | return NULL; |
| 186 | } |
| 187 | |
| 188 | void ss_session_free(struct ss_session *ss) |
| 189 | { |
| 190 | osmo_timer_del(&ss->timeout); |
| 191 | llist_del(&ss->list); |
| 192 | talloc_free(ss); |
| 193 | } |
| 194 | |
| 195 | static void ss_session_timeout(void *data) |
| 196 | { |
| 197 | struct ss_session *ss = data; |
| 198 | |
Harald Welte | 97bfb65 | 2018-07-29 12:28:11 +0200 | [diff] [blame] | 199 | LOGPSS(ss, LOGL_NOTICE, "SS Session Timeout, destroying\n"); |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 200 | /* FIXME: should we send a ReturnError component to the MS? */ |
| 201 | ss_session_free(ss); |
| 202 | } |
| 203 | |
| 204 | struct ss_session *ss_session_alloc(struct hlr *hlr, const char *imsi, uint32_t session_id) |
| 205 | { |
| 206 | struct ss_session *ss; |
| 207 | |
| 208 | OSMO_ASSERT(!ss_session_find(hlr, imsi, session_id)); |
| 209 | |
| 210 | ss = talloc_zero(hlr, struct ss_session); |
| 211 | OSMO_ASSERT(ss); |
| 212 | |
| 213 | OSMO_STRLCPY_ARRAY(ss->imsi, imsi); |
| 214 | ss->session_id = session_id; |
Vadim Yanitskiy | e6ce52b | 2018-12-01 00:16:44 +0700 | [diff] [blame] | 215 | |
| 216 | /* Schedule self-destruction timer */ |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 217 | osmo_timer_setup(&ss->timeout, ss_session_timeout, ss); |
Vadim Yanitskiy | d157a56 | 2018-12-01 00:03:39 +0700 | [diff] [blame] | 218 | if (g_hlr->ncss_guard_timeout > 0) |
| 219 | osmo_timer_schedule(&ss->timeout, g_hlr->ncss_guard_timeout, 0); |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 220 | |
| 221 | llist_add_tail(&ss->list, &hlr->ss_sessions); |
| 222 | return ss; |
| 223 | } |
| 224 | |
| 225 | /*********************************************************************** |
Harald Welte | 7266731 | 2018-07-29 12:38:09 +0200 | [diff] [blame] | 226 | * handling functions for encoding SS messages + wrapping them in GSUP |
| 227 | ***********************************************************************/ |
| 228 | |
Neels Hofmeyr | f1fe94c | 2019-04-02 04:26:55 +0200 | [diff] [blame^] | 229 | /* Resolve the target MSC by ss->imsi and send GSUP message. */ |
| 230 | static int ss_gsup_send(struct ss_session *ss, struct osmo_gsup_server *gs, struct msgb *msg) |
| 231 | { |
| 232 | struct hlr_subscriber subscr = {}; |
| 233 | int rc; |
| 234 | |
| 235 | /* Use vlr_number as looked up by the caller, or look up now. */ |
| 236 | if (!ss->vlr_number[0]) { |
| 237 | rc = db_subscr_get_by_imsi(g_hlr->dbc, ss->imsi, &subscr); |
| 238 | if (rc < 0) { |
| 239 | LOGPSS(ss, LOGL_ERROR, "Cannot find subscriber, cannot route GSUP message\n"); |
| 240 | msgb_free(msg); |
| 241 | return -EINVAL; |
| 242 | } |
| 243 | osmo_strlcpy(ss->vlr_number, subscr.vlr_number, sizeof(ss->vlr_number)); |
| 244 | } |
| 245 | |
| 246 | if (!ss->vlr_number[0]) { |
| 247 | LOGPSS(ss, LOGL_ERROR, "Cannot send GSUP message, no VLR number stored for subscriber\n"); |
| 248 | msgb_free(msg); |
| 249 | return -EINVAL; |
| 250 | } |
| 251 | |
| 252 | LOGPSS(ss, LOGL_DEBUG, "Tx SS/USSD to VLR '%s'\n", ss->vlr_number); |
| 253 | return osmo_gsup_addr_send(gs, (uint8_t *)ss->vlr_number, strlen(ss->vlr_number) + 1, msg); |
| 254 | } |
| 255 | |
Harald Welte | 7266731 | 2018-07-29 12:38:09 +0200 | [diff] [blame] | 256 | static int ss_tx_to_ms(struct ss_session *ss, enum osmo_gsup_message_type gsup_msg_type, |
| 257 | bool final, struct msgb *ss_msg) |
| 258 | |
| 259 | { |
| 260 | struct osmo_gsup_message resp = {0}; |
| 261 | struct msgb *resp_msg; |
| 262 | |
| 263 | resp.message_type = gsup_msg_type; |
| 264 | OSMO_STRLCPY_ARRAY(resp.imsi, ss->imsi); |
| 265 | if (final) |
| 266 | resp.session_state = OSMO_GSUP_SESSION_STATE_END; |
| 267 | else |
| 268 | resp.session_state = OSMO_GSUP_SESSION_STATE_CONTINUE; |
| 269 | resp.session_id = ss->session_id; |
| 270 | if (ss_msg) { |
| 271 | resp.ss_info = msgb_data(ss_msg); |
| 272 | resp.ss_info_len = msgb_length(ss_msg); |
| 273 | } |
| 274 | |
| 275 | resp_msg = gsm0480_msgb_alloc_name(__func__); |
| 276 | OSMO_ASSERT(resp_msg); |
| 277 | osmo_gsup_encode(resp_msg, &resp); |
| 278 | msgb_free(ss_msg); |
| 279 | |
Neels Hofmeyr | f1fe94c | 2019-04-02 04:26:55 +0200 | [diff] [blame^] | 280 | return ss_gsup_send(ss, g_hlr->gs, resp_msg); |
Harald Welte | 7266731 | 2018-07-29 12:38:09 +0200 | [diff] [blame] | 281 | } |
| 282 | |
| 283 | #if 0 |
| 284 | static int ss_tx_reject(struct ss_session *ss, int invoke_id, uint8_t problem_tag, |
| 285 | uint8_t problem_code) |
| 286 | { |
| 287 | struct msgb *msg = gsm0480_gen_reject(invoke_id, problem_tag, problem_code); |
| 288 | LOGPSS(ss, LOGL_NOTICE, "Tx Reject(%u, 0x%02x, 0x%02x)\n", invoke_id, |
| 289 | problem_tag, problem_code); |
| 290 | OSMO_ASSERT(msg); |
| 291 | return ss_tx_to_ms(ss, OSMO_GSUP_MSGT_PROC_SS_RESULT, true, msg); |
| 292 | } |
| 293 | #endif |
| 294 | |
| 295 | static int ss_tx_error(struct ss_session *ss, uint8_t invoke_id, uint8_t error_code) |
| 296 | { |
| 297 | struct msgb *msg = gsm0480_gen_return_error(invoke_id, error_code); |
| 298 | LOGPSS(ss, LOGL_NOTICE, "Tx ReturnError(%u, 0x%02x)\n", invoke_id, error_code); |
| 299 | OSMO_ASSERT(msg); |
| 300 | return ss_tx_to_ms(ss, OSMO_GSUP_MSGT_PROC_SS_RESULT, true, msg); |
| 301 | } |
| 302 | |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 303 | static int ss_tx_ussd_7bit(struct ss_session *ss, bool final, uint8_t invoke_id, const char *text) |
| 304 | { |
| 305 | struct msgb *msg = gsm0480_gen_ussd_resp_7bit(invoke_id, text); |
| 306 | LOGPSS(ss, LOGL_INFO, "Tx USSD '%s'\n", text); |
| 307 | OSMO_ASSERT(msg); |
| 308 | return ss_tx_to_ms(ss, OSMO_GSUP_MSGT_PROC_SS_RESULT, final, msg); |
| 309 | } |
| 310 | |
| 311 | /*********************************************************************** |
| 312 | * Internal USSD Handlers |
| 313 | ***********************************************************************/ |
| 314 | |
| 315 | #include "db.h" |
| 316 | |
| 317 | static int handle_ussd_own_msisdn(struct osmo_gsup_conn *conn, struct ss_session *ss, |
| 318 | const struct osmo_gsup_message *gsup, const struct ss_request *req) |
| 319 | { |
| 320 | struct hlr_subscriber subscr; |
| 321 | char buf[GSM0480_USSD_7BIT_STRING_LEN+1]; |
| 322 | int rc; |
| 323 | |
| 324 | rc = db_subscr_get_by_imsi(g_hlr->dbc, ss->imsi, &subscr); |
| 325 | switch (rc) { |
| 326 | case 0: |
| 327 | if (strlen(subscr.msisdn) == 0) |
| 328 | snprintf(buf, sizeof(buf), "You have no MSISDN!"); |
| 329 | else |
Vadim Yanitskiy | 3adb33d | 2018-08-03 00:07:54 +0700 | [diff] [blame] | 330 | snprintf(buf, sizeof(buf), "Your extension is %s", subscr.msisdn); |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 331 | ss_tx_ussd_7bit(ss, true, req->invoke_id, buf); |
| 332 | break; |
| 333 | case -ENOENT: |
| 334 | ss_tx_error(ss, true, GSM0480_ERR_CODE_UNKNOWN_SUBSCRIBER); |
| 335 | break; |
| 336 | case -EIO: |
| 337 | default: |
| 338 | ss_tx_error(ss, true, GSM0480_ERR_CODE_SYSTEM_FAILURE); |
| 339 | break; |
| 340 | } |
| 341 | return 0; |
| 342 | } |
| 343 | |
| 344 | static int handle_ussd_own_imsi(struct osmo_gsup_conn *conn, struct ss_session *ss, |
| 345 | const struct osmo_gsup_message *gsup, const struct ss_request *req) |
| 346 | { |
| 347 | char buf[GSM0480_USSD_7BIT_STRING_LEN+1]; |
Vadim Yanitskiy | 3adb33d | 2018-08-03 00:07:54 +0700 | [diff] [blame] | 348 | snprintf(buf, sizeof(buf), "Your IMSI is %s", ss->imsi); |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 349 | ss_tx_ussd_7bit(ss, true, req->invoke_id, buf); |
| 350 | return 0; |
| 351 | } |
| 352 | |
| 353 | |
| 354 | static const struct hlr_iuse hlr_iuses[] = { |
| 355 | { |
| 356 | .name = "own-msisdn", |
| 357 | .handle_ussd = handle_ussd_own_msisdn, |
| 358 | }, |
| 359 | { |
| 360 | .name = "own-imsi", |
| 361 | .handle_ussd = handle_ussd_own_imsi, |
| 362 | }, |
| 363 | }; |
| 364 | |
| 365 | const struct hlr_iuse *iuse_find(const char *name) |
| 366 | { |
| 367 | unsigned int i; |
| 368 | |
| 369 | for (i = 0; i < ARRAY_SIZE(hlr_iuses); i++) { |
| 370 | const struct hlr_iuse *iuse = &hlr_iuses[i]; |
| 371 | if (!strcmp(name, iuse->name)) |
| 372 | return iuse; |
| 373 | } |
| 374 | return NULL; |
| 375 | } |
Harald Welte | 7266731 | 2018-07-29 12:38:09 +0200 | [diff] [blame] | 376 | |
| 377 | |
| 378 | /*********************************************************************** |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 379 | * handling functions for individual GSUP messages |
| 380 | ***********************************************************************/ |
| 381 | |
| 382 | static bool ss_op_is_ussd(uint8_t opcode) |
| 383 | { |
| 384 | switch (opcode) { |
| 385 | case GSM0480_OP_CODE_PROCESS_USS_DATA: |
| 386 | case GSM0480_OP_CODE_PROCESS_USS_REQ: |
| 387 | case GSM0480_OP_CODE_USS_REQUEST: |
| 388 | case GSM0480_OP_CODE_USS_NOTIFY: |
| 389 | return true; |
| 390 | default: |
| 391 | return false; |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | /* is this GSUP connection an EUSE (true) or not (false)? */ |
| 396 | static bool conn_is_euse(struct osmo_gsup_conn *conn) |
| 397 | { |
| 398 | int rc; |
| 399 | uint8_t *addr; |
| 400 | |
| 401 | rc = osmo_gsup_conn_ccm_get(conn, &addr, IPAC_IDTAG_SERNR); |
| 402 | if (rc <= 5) |
| 403 | return false; |
| 404 | if (!strncmp((char *)addr, "EUSE-", 5)) |
| 405 | return true; |
| 406 | else |
| 407 | return false; |
| 408 | } |
| 409 | |
| 410 | static struct hlr_euse *euse_by_conn(struct osmo_gsup_conn *conn) |
| 411 | { |
| 412 | int rc; |
| 413 | char *addr; |
| 414 | struct hlr *hlr = conn->server->priv; |
| 415 | |
| 416 | rc = osmo_gsup_conn_ccm_get(conn, (uint8_t **) &addr, IPAC_IDTAG_SERNR); |
| 417 | if (rc <= 5) |
| 418 | return NULL; |
| 419 | if (strncmp(addr, "EUSE-", 5)) |
| 420 | return NULL; |
| 421 | |
| 422 | return euse_find(hlr, addr+5); |
| 423 | } |
| 424 | |
| 425 | static int handle_ss(struct ss_session *ss, const struct osmo_gsup_message *gsup, |
| 426 | const struct ss_request *req) |
| 427 | { |
| 428 | uint8_t comp_type = gsup->ss_info[0]; |
| 429 | |
Harald Welte | 7f32f5f | 2018-07-29 12:43:49 +0200 | [diff] [blame] | 430 | LOGPSS(ss, LOGL_INFO, "SS CompType=%s, OpCode=%s\n", |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 431 | gsm0480_comp_type_name(comp_type), gsm0480_op_code_name(req->opcode)); |
Vadim Yanitskiy | 4a4bdcd | 2018-10-12 21:44:07 +0200 | [diff] [blame] | 432 | |
| 433 | /** |
| 434 | * FIXME: As we don't store any SS related information |
| 435 | * (e.g. call forwarding preferences) in the database, |
| 436 | * we don't handle "structured" SS requests at all. |
| 437 | */ |
| 438 | LOGPSS(ss, LOGL_NOTICE, "Structured SS requests are not supported, rejecting...\n"); |
| 439 | ss_tx_error(ss, req->invoke_id, GSM0480_ERR_CODE_FACILITY_NOT_SUPPORTED); |
| 440 | return -ENOTSUP; |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 441 | } |
| 442 | |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 443 | /* Handle a USSD GSUP message for a given SS Session received from VLR or EUSE */ |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 444 | static int handle_ussd(struct osmo_gsup_conn *conn, struct ss_session *ss, |
| 445 | const struct osmo_gsup_message *gsup, const struct ss_request *req) |
| 446 | { |
| 447 | uint8_t comp_type = gsup->ss_info[0]; |
| 448 | struct msgb *msg_out; |
| 449 | bool is_euse_originated = conn_is_euse(conn); |
| 450 | |
Harald Welte | 7f32f5f | 2018-07-29 12:43:49 +0200 | [diff] [blame] | 451 | LOGPSS(ss, LOGL_INFO, "USSD CompType=%s, OpCode=%s '%s'\n", |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 452 | gsm0480_comp_type_name(comp_type), gsm0480_op_code_name(req->opcode), |
| 453 | req->ussd_text); |
| 454 | |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 455 | if ((ss->is_external && !ss->u.euse) || !ss->u.iuse) { |
Harald Welte | 7f32f5f | 2018-07-29 12:43:49 +0200 | [diff] [blame] | 456 | LOGPSS(ss, LOGL_NOTICE, "USSD for unknown code '%s'\n", req->ussd_text); |
Harald Welte | 7266731 | 2018-07-29 12:38:09 +0200 | [diff] [blame] | 457 | ss_tx_error(ss, req->invoke_id, GSM0480_ERR_CODE_SS_NOT_AVAILABLE); |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 458 | return 0; |
| 459 | } |
| 460 | |
| 461 | if (is_euse_originated) { |
Harald Welte | 7266731 | 2018-07-29 12:38:09 +0200 | [diff] [blame] | 462 | msg_out = msgb_alloc_headroom(1024+16, 16, "GSUP USSD FW"); |
| 463 | OSMO_ASSERT(msg_out); |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 464 | /* Received from EUSE, Forward to VLR */ |
| 465 | osmo_gsup_encode(msg_out, gsup); |
Neels Hofmeyr | f1fe94c | 2019-04-02 04:26:55 +0200 | [diff] [blame^] | 466 | ss_gsup_send(ss, conn->server, msg_out); |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 467 | } else { |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 468 | /* Received from VLR (MS) */ |
| 469 | if (ss->is_external) { |
| 470 | /* Forward to EUSE */ |
| 471 | char addr[128]; |
| 472 | strcpy(addr, "EUSE-"); |
| 473 | osmo_strlcpy(addr+5, ss->u.euse->name, sizeof(addr)-5); |
| 474 | conn = gsup_route_find(conn->server, (uint8_t *)addr, strlen(addr)+1); |
| 475 | if (!conn) { |
| 476 | LOGPSS(ss, LOGL_ERROR, "Cannot find conn for EUSE %s\n", addr); |
| 477 | ss_tx_error(ss, req->invoke_id, GSM0480_ERR_CODE_SYSTEM_FAILURE); |
| 478 | } else { |
| 479 | msg_out = msgb_alloc_headroom(1024+16, 16, "GSUP USSD FW"); |
| 480 | OSMO_ASSERT(msg_out); |
| 481 | osmo_gsup_encode(msg_out, gsup); |
| 482 | osmo_gsup_conn_send(conn, msg_out); |
| 483 | } |
Harald Welte | 7266731 | 2018-07-29 12:38:09 +0200 | [diff] [blame] | 484 | } else { |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 485 | /* Handle internally */ |
| 486 | ss->u.iuse->handle_ussd(conn, ss, gsup, req); |
Vadim Yanitskiy | 9c8806a | 2018-11-30 08:11:19 +0700 | [diff] [blame] | 487 | /* Release session immediately */ |
| 488 | ss_session_free(ss); |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 489 | } |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 490 | } |
| 491 | |
| 492 | return 0; |
| 493 | } |
| 494 | |
| 495 | |
| 496 | /* this function is called for any SS_REQ/SS_RESP messages from both the MSC/VLR side as well |
| 497 | * as from the EUSE side */ |
| 498 | int rx_proc_ss_req(struct osmo_gsup_conn *conn, const struct osmo_gsup_message *gsup) |
| 499 | { |
| 500 | struct hlr *hlr = conn->server->priv; |
| 501 | struct ss_session *ss; |
| 502 | struct ss_request req = {0}; |
| 503 | |
Harald Welte | 95b96d4 | 2018-07-29 12:47:39 +0200 | [diff] [blame] | 504 | LOGP(DSS, LOGL_DEBUG, "%s/0x%08x: Process SS (%s)\n", gsup->imsi, gsup->session_id, |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 505 | osmo_gsup_session_state_name(gsup->session_state)); |
| 506 | |
| 507 | /* decode and find out what kind of SS message it is */ |
| 508 | if (gsup->ss_info && gsup->ss_info_len) { |
| 509 | if (gsm0480_parse_facility_ie(gsup->ss_info, gsup->ss_info_len, &req)) { |
Harald Welte | 95b96d4 | 2018-07-29 12:47:39 +0200 | [diff] [blame] | 510 | LOGP(DSS, LOGL_ERROR, "%s/0x%082x: Unable to parse SS request: %s\n", |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 511 | gsup->imsi, gsup->session_id, |
| 512 | osmo_hexdump(gsup->ss_info, gsup->ss_info_len)); |
Harald Welte | 7266731 | 2018-07-29 12:38:09 +0200 | [diff] [blame] | 513 | /* FIXME: Send a Reject component? */ |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 514 | goto out_err; |
| 515 | } |
| 516 | } |
| 517 | |
| 518 | switch (gsup->session_state) { |
| 519 | case OSMO_GSUP_SESSION_STATE_BEGIN: |
| 520 | /* Check for overlapping Session ID usage */ |
| 521 | if (ss_session_find(hlr, gsup->imsi, gsup->session_id)) { |
Harald Welte | 95b96d4 | 2018-07-29 12:47:39 +0200 | [diff] [blame] | 522 | LOGP(DSS, LOGL_ERROR, "%s/0x%08x: BEGIN with non-unique session ID!\n", |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 523 | gsup->imsi, gsup->session_id); |
| 524 | goto out_err; |
| 525 | } |
| 526 | ss = ss_session_alloc(hlr, gsup->imsi, gsup->session_id); |
| 527 | if (!ss) { |
Harald Welte | 95b96d4 | 2018-07-29 12:47:39 +0200 | [diff] [blame] | 528 | LOGP(DSS, LOGL_ERROR, "%s/0x%08x: Unable to allocate SS session\n", |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 529 | gsup->imsi, gsup->session_id); |
| 530 | goto out_err; |
| 531 | } |
| 532 | if (ss_op_is_ussd(req.opcode)) { |
| 533 | if (conn_is_euse(conn)) { |
| 534 | /* EUSE->VLR: MT USSD. EUSE is known ('conn'), VLR is to be resolved */ |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 535 | ss->u.euse = euse_by_conn(conn); |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 536 | } else { |
| 537 | /* VLR->EUSE: MO USSD. VLR is known ('conn'), EUSE is to be resolved */ |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 538 | struct hlr_ussd_route *rt; |
| 539 | rt = ussd_route_lookup_7bit(hlr, (const char *) req.ussd_text); |
| 540 | if (rt) { |
| 541 | if (rt->is_external) { |
| 542 | ss->is_external = true; |
| 543 | ss->u.euse = rt->u.euse; |
| 544 | } else if (rt) { |
| 545 | ss->is_external = false; |
| 546 | ss->u.iuse = rt->u.iuse; |
| 547 | } |
Harald Welte | 1eb9869 | 2018-08-08 08:57:26 +0200 | [diff] [blame] | 548 | } else { |
| 549 | if (hlr->euse_default) { |
| 550 | ss->is_external = true; |
| 551 | ss->u.euse = hlr->euse_default; |
| 552 | } |
Harald Welte | dab544e | 2018-07-29 16:14:48 +0200 | [diff] [blame] | 553 | } |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 554 | } |
| 555 | /* dispatch unstructured SS to routing */ |
| 556 | handle_ussd(conn, ss, gsup, &req); |
| 557 | } else { |
| 558 | /* dispatch non-call SS to internal code */ |
| 559 | handle_ss(ss, gsup, &req); |
| 560 | } |
| 561 | break; |
| 562 | case OSMO_GSUP_SESSION_STATE_CONTINUE: |
| 563 | ss = ss_session_find(hlr, gsup->imsi, gsup->session_id); |
| 564 | if (!ss) { |
Harald Welte | 95b96d4 | 2018-07-29 12:47:39 +0200 | [diff] [blame] | 565 | LOGP(DSS, LOGL_ERROR, "%s/0x%08x: CONTINUE for unknown SS session\n", |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 566 | gsup->imsi, gsup->session_id); |
| 567 | goto out_err; |
| 568 | } |
Vadim Yanitskiy | e6ce52b | 2018-12-01 00:16:44 +0700 | [diff] [blame] | 569 | |
| 570 | /* Reschedule self-destruction timer */ |
| 571 | if (g_hlr->ncss_guard_timeout > 0) |
| 572 | osmo_timer_schedule(&ss->timeout, g_hlr->ncss_guard_timeout, 0); |
| 573 | |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 574 | if (ss_op_is_ussd(req.opcode)) { |
| 575 | /* dispatch unstructured SS to routing */ |
| 576 | handle_ussd(conn, ss, gsup, &req); |
| 577 | } else { |
| 578 | /* dispatch non-call SS to internal code */ |
| 579 | handle_ss(ss, gsup, &req); |
| 580 | } |
| 581 | break; |
| 582 | case OSMO_GSUP_SESSION_STATE_END: |
| 583 | ss = ss_session_find(hlr, gsup->imsi, gsup->session_id); |
| 584 | if (!ss) { |
Harald Welte | 95b96d4 | 2018-07-29 12:47:39 +0200 | [diff] [blame] | 585 | LOGP(DSS, LOGL_ERROR, "%s/0x%08x: END for unknown SS session\n", |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 586 | gsup->imsi, gsup->session_id); |
| 587 | goto out_err; |
| 588 | } |
| 589 | if (ss_op_is_ussd(req.opcode)) { |
| 590 | /* dispatch unstructured SS to routing */ |
| 591 | handle_ussd(conn, ss, gsup, &req); |
| 592 | } else { |
| 593 | /* dispatch non-call SS to internal code */ |
| 594 | handle_ss(ss, gsup, &req); |
| 595 | } |
| 596 | ss_session_free(ss); |
| 597 | break; |
| 598 | default: |
Harald Welte | 95b96d4 | 2018-07-29 12:47:39 +0200 | [diff] [blame] | 599 | LOGP(DSS, LOGL_ERROR, "%s/0x%08x: Unknown SS State %d\n", gsup->imsi, |
Harald Welte | 7f32f5f | 2018-07-29 12:43:49 +0200 | [diff] [blame] | 600 | gsup->session_id, gsup->session_state); |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 601 | goto out_err; |
| 602 | } |
| 603 | |
| 604 | return 0; |
| 605 | |
| 606 | out_err: |
| 607 | return 0; |
| 608 | } |
| 609 | |
| 610 | int rx_proc_ss_error(struct osmo_gsup_conn *conn, const struct osmo_gsup_message *gsup) |
| 611 | { |
Harald Welte | 95b96d4 | 2018-07-29 12:47:39 +0200 | [diff] [blame] | 612 | LOGP(DSS, LOGL_NOTICE, "%s/0x%08x: Process SS ERROR (%s)\n", gsup->imsi, gsup->session_id, |
Harald Welte | bb77939 | 2018-06-16 20:21:10 +0200 | [diff] [blame] | 613 | osmo_gsup_session_state_name(gsup->session_state)); |
| 614 | return 0; |
| 615 | } |