/* Osmocom Visitor Location Register (VLR) code base */ /* (C) 2016 by Harald Welte * * All Rights Reserved * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as published by * the Free Software Foundation; either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see . * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "vlr_core.h" #include "vlr_auth_fsm.h" #include "vlr_lu_fsm.h" #include "vlr_access_req_fsm.h" #define SGSN_SUBSCR_MAX_RETRIES 3 #define SGSN_SUBSCR_RETRY_INTERVAL 10 /*********************************************************************** * Convenience functions ***********************************************************************/ const struct value_string vlr_ciph_names[] = { OSMO_VALUE_STRING(VLR_CIPH_NONE), OSMO_VALUE_STRING(VLR_CIPH_A5_1), OSMO_VALUE_STRING(VLR_CIPH_A5_2), OSMO_VALUE_STRING(VLR_CIPH_A5_3), { 0, NULL } }; uint32_t vlr_timer(struct vlr_instance *vlr, uint32_t timer) { uint32_t tidx = 0xffffffff; switch (timer) { case 3270: tidx = VLR_T_3270; break; case 3260: tidx = VLR_T_3260; break; case 3250: tidx = VLR_T_3250; break; } OSMO_ASSERT(tidx < sizeof(vlr->cfg.timer)); return vlr->cfg.timer[tidx]; } /* return static buffer with printable name of VLR subscriber */ const char *vlr_subscr_name(struct vlr_subscr *vsub) { static char buf[128]; char imsi[23] = ""; char msisdn[25] = ""; char tmsi[23] = ""; char tmsi_new[23] = ""; bool present = false; if (!vsub) return "unknown"; if (vsub->imsi[0]) { snprintf(imsi, sizeof(imsi), "IMSI-%s", vsub->imsi); present = true; } if (vsub->msisdn[0]) { snprintf(msisdn, sizeof(msisdn), "%sMSISDN-%s", present? "_" : "", vsub->msisdn); present = true; } if (vsub->tmsi != GSM_RESERVED_TMSI) { snprintf(tmsi, sizeof(buf), "%sTMSI-0x%08x", present? "_" : "", vsub->tmsi); present = true; } if (vsub->tmsi_new != GSM_RESERVED_TMSI) { snprintf(buf, sizeof(buf), "%sTMSInew-0x%08x", present? "_" : "", vsub->tmsi_new); present = true; } if (!present) return "unknown"; snprintf(buf, sizeof(buf), "%s%s%s%s", imsi, msisdn, tmsi, tmsi_new); return buf; } const char *vlr_subscr_msisdn_or_name(struct vlr_subscr *vsub) { if (!vsub || !vsub->msisdn[0]) return vlr_subscr_name(vsub); return vsub->msisdn; } struct vlr_subscr *_vlr_subscr_find_by_imsi(struct vlr_instance *vlr, const char *imsi, const char *file, int line) { struct vlr_subscr *vsub; if (!imsi || !*imsi) return NULL; llist_for_each_entry(vsub, &vlr->subscribers, list) { if (vlr_subscr_matches_imsi(vsub, imsi)) return _vlr_subscr_get(vsub, file, line); } return NULL; } struct vlr_subscr *_vlr_subscr_find_by_tmsi(struct vlr_instance *vlr, uint32_t tmsi, const char *file, int line) { struct vlr_subscr *vsub; if (tmsi == GSM_RESERVED_TMSI) return NULL; llist_for_each_entry(vsub, &vlr->subscribers, list) { if (vlr_subscr_matches_tmsi(vsub, tmsi)) return _vlr_subscr_get(vsub, file, line); } return NULL; } struct vlr_subscr *_vlr_subscr_find_by_msisdn(struct vlr_instance *vlr, const char *msisdn, const char *file, int line) { struct vlr_subscr *vsub; if (!msisdn || !*msisdn) return NULL; llist_for_each_entry(vsub, &vlr->subscribers, list) { if (vlr_subscr_matches_msisdn(vsub, msisdn)) return _vlr_subscr_get(vsub, file, line); } return NULL; } /* Transmit GSUP message to HLR */ static int vlr_tx_gsup_message(const struct vlr_instance *vlr, const struct osmo_gsup_message *gsup_msg) { struct msgb *msg = osmo_gsup_client_msgb_alloc(); int rc = osmo_gsup_encode(msg, gsup_msg); if (rc < 0) { LOGP(DVLR, LOGL_ERROR, "GSUP encoding failure: %s\n", strerror(-rc)); return rc; } if (!vlr->gsup_client) { LOGP(DVLR, LOGL_NOTICE, "GSUP link is down, cannot " "send GSUP: %s\n", msgb_hexdump(msg)); msgb_free(msg); return -ENOTSUP; } LOGP(DVLR, LOGL_DEBUG, "GSUP tx: %s\n", osmo_hexdump_nospc(msg->data, msg->len)); return osmo_gsup_client_send(vlr->gsup_client, msg); } /* Transmit GSUP message for subscriber to HLR, using IMSI from subscriber */ static int vlr_subscr_tx_gsup_message(const struct vlr_subscr *vsub, struct osmo_gsup_message *gsup_msg) { struct vlr_instance *vlr = vsub->vlr; if (strlen(gsup_msg->imsi) == 0) OSMO_STRLCPY_ARRAY(gsup_msg->imsi, vsub->imsi); return vlr_tx_gsup_message(vlr, gsup_msg); } /* Transmit GSUP error in response to original message */ static int vlr_tx_gsup_error_reply(const struct vlr_instance *vlr, struct osmo_gsup_message *gsup_orig, enum gsm48_gmm_cause cause) { struct osmo_gsup_message gsup_reply = {0}; OSMO_STRLCPY_ARRAY(gsup_reply.imsi, gsup_orig->imsi); gsup_reply.cause = cause; gsup_reply.message_type = OSMO_GSUP_TO_MSGT_ERROR(gsup_orig->message_type); return vlr_tx_gsup_message(vlr, &gsup_reply); } struct vlr_subscr *_vlr_subscr_get(struct vlr_subscr *sub, const char *file, int line) { if (!sub) return NULL; OSMO_ASSERT(sub->use_count < INT_MAX); sub->use_count++; LOGPSRC(DREF, LOGL_DEBUG, file, line, "VLR subscr %s usage increases to: %d\n", vlr_subscr_name(sub), sub->use_count); return sub; } struct vlr_subscr *_vlr_subscr_put(struct vlr_subscr *sub, const char *file, int line) { if (!sub) return NULL; sub->use_count--; LOGPSRC(DREF, sub->use_count >= 0? LOGL_DEBUG : LOGL_ERROR, file, line, "VLR subscr %s usage decreases to: %d\n", vlr_subscr_name(sub), sub->use_count); if (sub->use_count <= 0) vlr_subscr_free(sub); return NULL; } /* Allocate a new subscriber and insert it into list */ static struct vlr_subscr *_vlr_subscr_alloc(struct vlr_instance *vlr) { struct vlr_subscr *vsub; int i; vsub = talloc_zero(vlr, struct vlr_subscr); vsub->vlr = vlr; vsub->tmsi = GSM_RESERVED_TMSI; vsub->tmsi_new = GSM_RESERVED_TMSI; for (i = 0; i < ARRAY_SIZE(vsub->auth_tuples); i++) vsub->auth_tuples[i].key_seq = VLR_KEY_SEQ_INVAL; INIT_LLIST_HEAD(&vsub->cs.requests); INIT_LLIST_HEAD(&vsub->ps.pdp_list); llist_add_tail(&vsub->list, &vlr->subscribers); return vsub; } struct vlr_subscr *vlr_subscr_alloc(struct vlr_instance *vlr) { return vlr_subscr_get(_vlr_subscr_alloc(vlr)); } /* Send a GSUP Purge MS request. * TODO: this should be sent to the *previous* VLR when this VLR is "taking" * this subscriber, not to the HLR? */ int vlr_subscr_purge(struct vlr_subscr *vsub) { struct osmo_gsup_message gsup_msg = {0}; gsup_msg.message_type = OSMO_GSUP_MSGT_PURGE_MS_REQUEST; /* provide HLR number in case we know it */ gsup_msg.hlr_enc_len = vsub->hlr.len; gsup_msg.hlr_enc = vsub->hlr.buf; return vlr_subscr_tx_gsup_message(vsub, &gsup_msg); } void vlr_subscr_cancel_attach_fsm(struct vlr_subscr *vsub, enum osmo_fsm_term_cause fsm_cause, uint8_t gsm48_cause) { if (!vsub) return; vlr_subscr_get(vsub); if (vsub->lu_fsm) vlr_loc_update_cancel(vsub->lu_fsm, fsm_cause, gsm48_cause); if (vsub->proc_arq_fsm) vlr_parq_cancel(vsub->proc_arq_fsm, fsm_cause, gsm48_cause); vlr_subscr_put(vsub); } /* Call vlr_subscr_cancel(), then completely drop the entry from the VLR */ void vlr_subscr_free(struct vlr_subscr *vsub) { llist_del(&vsub->list); DEBUGP(DREF, "freeing VLR subscr %s\n", vlr_subscr_name(vsub)); talloc_free(vsub); } /* Generate a new TMSI and store in vsub->tmsi_new. * Search all known subscribers to ensure that the TMSI is unique. */ int vlr_subscr_alloc_tmsi(struct vlr_subscr *vsub) { struct vlr_instance *vlr = vsub->vlr; uint32_t tmsi; int tried, rc; for (tried = 0; tried < 100; tried++) { rc = osmo_get_rand_id((uint8_t *) &tmsi, sizeof(tmsi)); if (rc < 0) { LOGP(DDB, LOGL_ERROR, "osmo_get_rand_id() failed: %s\n", strerror(-rc)); return rc; } /* throw the dice again, if the TSMI doesn't fit */ if (tmsi == GSM_RESERVED_TMSI) continue; /* Section 2.4 of 23.003: MSC has two MSB 00/01/10, SGSN 11 */ if (vlr->cfg.is_ps) { /* SGSN */ tmsi |= 0xC000000; } else { /* MSC */ if ((tmsi & 0xC0000000) == 0xC0000000) tmsi &= ~0xC0000000; } /* If this TMSI is already in use, try another one. */ if (vlr_subscr_find_by_tmsi(vlr, tmsi)) continue; vsub->tmsi_new = tmsi; return 0; } LOGP(DVLR, LOGL_ERROR, "subscr %s: unable to generate valid TMSI" " after %d tries\n", vlr_subscr_name(vsub), tried); return -1; } /* Find subscriber by IMSI, or create new subscriber if not found. * \param[in] vlr VLR instace. * \param[in] imsi IMSI string. * \param[out] created if non-NULL, returns whether a new entry was created. */ struct vlr_subscr *_vlr_subscr_find_or_create_by_imsi(struct vlr_instance *vlr, const char *imsi, bool *created, const char *file, int line) { struct vlr_subscr *vsub; vsub = _vlr_subscr_find_by_imsi(vlr, imsi, file, line); if (vsub) { if (created) *created = false; return vsub; } vsub = _vlr_subscr_get(_vlr_subscr_alloc(vlr), file, line); if (!vsub) return NULL; vlr_subscr_set_imsi(vsub, imsi); LOGP(DVLR, LOGL_INFO, "New subscr, IMSI: %s\n", vsub->imsi); if (created) *created = true; return vsub; } /* Find subscriber by TMSI, or create new subscriber if not found. * \param[in] vlr VLR instace. * \param[in] tmsi TMSI. * \param[out] created if non-NULL, returns whether a new entry was created. */ struct vlr_subscr *_vlr_subscr_find_or_create_by_tmsi(struct vlr_instance *vlr, uint32_t tmsi, bool *created, const char *file, int line) { struct vlr_subscr *vsub; vsub = _vlr_subscr_find_by_tmsi(vlr, tmsi, file, line); if (vsub) { if (created) *created = false; return vsub; } vsub = _vlr_subscr_get(_vlr_subscr_alloc(vlr), file, line); if (!vsub) return NULL; vsub->tmsi = tmsi; LOGP(DVLR, LOGL_INFO, "New subscr, TMSI: 0x%08x\n", vsub->tmsi); if (created) *created = true; return vsub; } void vlr_subscr_set_imsi(struct vlr_subscr *vsub, const char *imsi) { if (!vsub) return; if (OSMO_STRLCPY_ARRAY(vsub->imsi, imsi) >= sizeof(vsub->imsi)) { LOGP(DVLR, LOGL_NOTICE, "IMSI was truncated: full IMSI=%s, truncated IMSI=%s\n", imsi, vsub->imsi); /* XXX Set truncated IMSI anyway, we currently cannot return an error from here. */ } vsub->id = atoll(vsub->imsi); DEBUGP(DVLR, "set IMSI on subscriber; IMSI=%s id=%llu\n", vsub->imsi, vsub->id); } void vlr_subscr_set_imei(struct vlr_subscr *vsub, const char *imei) { if (!vsub) return; OSMO_STRLCPY_ARRAY(vsub->imei, imei); DEBUGP(DVLR, "set IMEI on subscriber; IMSI=%s IMEI=%s\n", vsub->imsi, vsub->imei); } void vlr_subscr_set_imeisv(struct vlr_subscr *vsub, const char *imeisv) { if (!vsub) return; OSMO_STRLCPY_ARRAY(vsub->imeisv, imeisv); DEBUGP(DVLR, "set IMEISV on subscriber; IMSI=%s IMEISV=%s\n", vsub->imsi, vsub->imeisv); } /* Safely copy the given MSISDN string to vsub->msisdn */ void vlr_subscr_set_msisdn(struct vlr_subscr *vsub, const char *msisdn) { if (!vsub) return; OSMO_STRLCPY_ARRAY(vsub->msisdn, msisdn); DEBUGP(DVLR, "set MSISDN on subscriber; IMSI=%s MSISDN=%s\n", vsub->imsi, vsub->msisdn); } bool vlr_subscr_matches_imsi(struct vlr_subscr *vsub, const char *imsi) { return vsub && imsi && vsub->imsi[0] && !strcmp(vsub->imsi, imsi); } bool vlr_subscr_matches_tmsi(struct vlr_subscr *vsub, uint32_t tmsi) { return vsub && tmsi != GSM_RESERVED_TMSI && (vsub->tmsi == tmsi || vsub->tmsi_new == tmsi); } bool vlr_subscr_matches_msisdn(struct vlr_subscr *vsub, const char *msisdn) { return vsub && msisdn && vsub->msisdn[0] && !strcmp(vsub->msisdn, msisdn); } bool vlr_subscr_matches_imei(struct vlr_subscr *vsub, const char *imei) { return vsub && imei && vsub->imei[0] && !strcmp(vsub->imei, imei); } /* Send updated subscriber information to HLR */ int vlr_subscr_changed(struct vlr_subscr *vsub) { /* FIXME */ LOGP(DVLR, LOGL_ERROR, "Not implemented: %s\n", __func__); return 0; } void vlr_subscr_enable_expire_lu(struct vlr_subscr *vsub) { struct gsm_network *net = vsub->vlr->user_ctx; /* XXX move t3212 into struct vlr_instance? */ struct timespec now; /* The T3212 timeout value field is coded as the binary representation of the timeout * value for periodic updating in decihours. Mark the subscriber as inactive if it missed * two consecutive location updates. Timeout is twice the t3212 value plus one minute. */ if (osmo_clock_gettime(CLOCK_MONOTONIC, &now) == 0) { vsub->expire_lu = now.tv_sec + (net->t3212 * 60 * 6 * 2) + 60; } else { LOGP(DVLR, LOGL_ERROR, "%s: Could not enable Location Update expiry: unable to read current time\n", vlr_subscr_name(vsub)); /* Disable LU expiry for this subscriber. This subscriber will only be freed after an explicit IMSI detach. */ vsub->expire_lu = VLR_SUBSCRIBER_NO_EXPIRATION; } } void vlr_subscr_expire_lu(void *data) { struct vlr_instance *vlr = data; struct vlr_subscr *vsub, *vsub_tmp; struct timespec now; if (llist_empty(&vlr->subscribers)) goto done; if (osmo_clock_gettime(CLOCK_MONOTONIC, &now) != 0) { LOGP(DVLR, LOGL_ERROR, "Skipping Location Update expiry: Could not read current time\n"); goto done; } llist_for_each_entry_safe(vsub, vsub_tmp, &vlr->subscribers, list) { if (vsub->expire_lu == VLR_SUBSCRIBER_NO_EXPIRATION || vsub->expire_lu > now.tv_sec) continue; LOGP(DVLR, LOGL_DEBUG, "%s: Location Update expired\n", vlr_subscr_name(vsub)); vlr_subscr_rx_imsi_detach(vsub); } done: osmo_timer_schedule(&vlr->lu_expire_timer, VLR_SUBSCRIBER_LU_EXPIRATION_INTERVAL, 0); } /*********************************************************************** * PDP context data ***********************************************************************/ #define GSM_APN_LENGTH 102 /* see GSM 09.02, 17.7.1, PDP-Context and GPRSSubscriptionData */ /* see GSM 09.02, B.1, gprsSubscriptionData */ struct sgsn_subscriber_pdp_data { struct llist_head list; unsigned int context_id; uint16_t pdp_type; char apn_str[GSM_APN_LENGTH]; uint8_t qos_subscribed[20]; size_t qos_subscribed_len; }; struct sgsn_subscriber_pdp_data * vlr_subscr_pdp_data_alloc(struct vlr_subscr *vsub) { struct sgsn_subscriber_pdp_data* pdata; pdata = talloc_zero(vsub, struct sgsn_subscriber_pdp_data); llist_add_tail(&pdata->list, &vsub->ps.pdp_list); return pdata; } static int vlr_subscr_pdp_data_clear(struct vlr_subscr *vsub) { struct sgsn_subscriber_pdp_data *pdp, *pdp2; int count = 0; llist_for_each_entry_safe(pdp, pdp2, &vsub->ps.pdp_list, list) { llist_del(&pdp->list); talloc_free(pdp); count += 1; } return count; } static struct sgsn_subscriber_pdp_data * vlr_subscr_pdp_data_get_by_id(struct vlr_subscr *vsub, unsigned context_id) { struct sgsn_subscriber_pdp_data *pdp; llist_for_each_entry(pdp, &vsub->ps.pdp_list, list) { if (pdp->context_id == context_id) return pdp; } return NULL; } /*********************************************************************** * Actual Implementation ***********************************************************************/ static int vlr_rx_gsup_unknown_imsi(struct vlr_instance *vlr, struct osmo_gsup_message *gsup_msg) { if (OSMO_GSUP_IS_MSGT_REQUEST(gsup_msg->message_type)) { int rc = vlr_tx_gsup_error_reply(vlr, gsup_msg, GMM_CAUSE_IMSI_UNKNOWN); if (rc < 0) LOGP(DVLR, LOGL_ERROR, "Failed to send error reply for IMSI %s\n", gsup_msg->imsi); LOGP(DVLR, LOGL_NOTICE, "Unknown IMSI %s, discarding GSUP request " "of type 0x%02x\n", gsup_msg->imsi, gsup_msg->message_type); } else if (OSMO_GSUP_IS_MSGT_ERROR(gsup_msg->message_type)) { LOGP(DVLR, LOGL_NOTICE, "Unknown IMSI %s, discarding GSUP error " "of type 0x%02x, cause '%s' (%d)\n", gsup_msg->imsi, gsup_msg->message_type, get_value_string(gsm48_gmm_cause_names, gsup_msg->cause), gsup_msg->cause); } else { LOGP(DVLR, LOGL_NOTICE, "Unknown IMSI %s, discarding GSUP response " "of type 0x%02x\n", gsup_msg->imsi, gsup_msg->message_type); } return -GMM_CAUSE_IMSI_UNKNOWN; } static int vlr_rx_gsup_purge_no_subscr(struct vlr_instance *vlr, struct osmo_gsup_message *gsup_msg) { if (OSMO_GSUP_IS_MSGT_ERROR(gsup_msg->message_type)) { LOGGSUPP(LOGL_NOTICE, gsup_msg, "Purge MS has failed with cause '%s' (%d)\n", get_value_string(gsm48_gmm_cause_names, gsup_msg->cause), gsup_msg->cause); return -gsup_msg->cause; } LOGGSUPP(LOGL_INFO, gsup_msg, "Completing purge MS\n"); return 0; } /* VLR internal call to request UpdateLocation from HLR */ int vlr_subscr_req_lu(struct vlr_subscr *vsub) { struct osmo_gsup_message gsup_msg = {0}; int rc; gsup_msg.message_type = OSMO_GSUP_MSGT_UPDATE_LOCATION_REQUEST; gsup_msg.cn_domain = vsub->vlr->cfg.is_ps ? OSMO_GSUP_CN_DOMAIN_PS : OSMO_GSUP_CN_DOMAIN_CS; rc = vlr_subscr_tx_gsup_message(vsub, &gsup_msg); return rc; } /* VLR internal call to request tuples from HLR */ int vlr_subscr_req_sai(struct vlr_subscr *vsub, const uint8_t *auts, const uint8_t *auts_rand) { struct osmo_gsup_message gsup_msg = {0}; gsup_msg.message_type = OSMO_GSUP_MSGT_SEND_AUTH_INFO_REQUEST; gsup_msg.auts = auts; gsup_msg.rand = auts_rand; return vlr_subscr_tx_gsup_message(vsub, &gsup_msg); } /* Tell HLR that authentication failure occurred */ int vlr_subscr_tx_auth_fail_rep(const struct vlr_subscr *vsub) { struct osmo_gsup_message gsup_msg = {0}; gsup_msg.message_type = OSMO_GSUP_MSGT_AUTH_FAIL_REPORT; OSMO_STRLCPY_ARRAY(gsup_msg.imsi, vsub->imsi); return vlr_tx_gsup_message(vsub->vlr, &gsup_msg); } /* Update the subscriber with GSUP-received auth tuples */ void vlr_subscr_update_tuples(struct vlr_subscr *vsub, const struct osmo_gsup_message *gsup) { unsigned int i; unsigned int got_tuples; if (gsup->num_auth_vectors) { memset(&vsub->auth_tuples, 0, sizeof(vsub->auth_tuples)); for (i = 0; i < ARRAY_SIZE(vsub->auth_tuples); i++) vsub->auth_tuples[i].key_seq = VLR_KEY_SEQ_INVAL; } got_tuples = 0; for (i = 0; i < gsup->num_auth_vectors; i++) { size_t key_seq = i; if (key_seq >= ARRAY_SIZE(vsub->auth_tuples)) { LOGVSUBP(LOGL_NOTICE, vsub, "Skipping auth tuple wih invalid cksn %zu\n", key_seq); continue; } vsub->auth_tuples[i].vec = gsup->auth_vectors[i]; vsub->auth_tuples[i].key_seq = key_seq; got_tuples++; } LOGVSUBP(LOGL_DEBUG, vsub, "Received %u auth tuples\n", got_tuples); if (!got_tuples) { /* FIXME what now? */ // vlr_subscr_cancel(vsub, GMM_CAUSE_GSM_AUTH_UNACCEPT); ? } /* New tuples means last_tuple becomes invalid */ vsub->last_tuple = NULL; } /* Handle SendAuthInfo Result/Error from HLR */ static int vlr_subscr_handle_sai_res(struct vlr_subscr *vsub, const struct osmo_gsup_message *gsup) { struct osmo_fsm_inst *auth_fi = vsub->auth_fsm; void *data = (void *) gsup; switch (gsup->message_type) { case OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: osmo_fsm_inst_dispatch(auth_fi, VLR_AUTH_E_HLR_SAI_ACK, data); break; case OSMO_GSUP_MSGT_SEND_AUTH_INFO_ERROR: osmo_fsm_inst_dispatch(auth_fi, VLR_AUTH_E_HLR_SAI_NACK, data); break; default: return -1; } return 0; } static int decode_bcd_number_safe(char *output, int output_len, const uint8_t *bcd_lv, int input_len, int h_len) { uint8_t len; OSMO_ASSERT(output_len >= 1); *output = '\0'; if (input_len < 1) return -EIO; len = bcd_lv[0]; if (input_len < len) return -EIO; return gsm48_decode_bcd_number(output, output_len, bcd_lv, h_len); } static void vlr_subscr_gsup_insert_data(struct vlr_subscr *vsub, const struct osmo_gsup_message *gsup_msg) { unsigned idx; int rc; if (gsup_msg->msisdn_enc) {//FIXME: vlr_subscr_set_msisdn()? decode_bcd_number_safe(vsub->msisdn, sizeof(vsub->msisdn), gsup_msg->msisdn_enc, gsup_msg->msisdn_enc_len, 0); LOGP(DVLR, LOGL_DEBUG, "IMSI:%s has MSISDN:%s\n", vsub->imsi, vsub->msisdn); } if (gsup_msg->hlr_enc) { if (gsup_msg->hlr_enc_len > sizeof(vsub->hlr.buf)) { LOGP(DVLR, LOGL_ERROR, "HLR-Number too long (%zu)\n", gsup_msg->hlr_enc_len); vsub->hlr.len = 0; } else { memcpy(vsub->hlr.buf, gsup_msg->hlr_enc, gsup_msg->hlr_enc_len); vsub->hlr.len = gsup_msg->hlr_enc_len; } } if (gsup_msg->pdp_info_compl) { rc = vlr_subscr_pdp_data_clear(vsub); if (rc > 0) LOGP(DVLR, LOGL_INFO, "Cleared existing PDP info\n"); } for (idx = 0; idx < gsup_msg->num_pdp_infos; idx++) { const struct osmo_gsup_pdp_info *pdp_info = &gsup_msg->pdp_infos[idx]; size_t ctx_id = pdp_info->context_id; struct sgsn_subscriber_pdp_data *pdp_data; if (pdp_info->apn_enc_len >= sizeof(pdp_data->apn_str)-1) { LOGVSUBP(LOGL_ERROR, vsub, "APN too long, context id = %zu, APN = %s\n", ctx_id, osmo_hexdump(pdp_info->apn_enc, pdp_info->apn_enc_len)); continue; } if (pdp_info->qos_enc_len > sizeof(pdp_data->qos_subscribed)) { LOGVSUBP(LOGL_ERROR, vsub, "QoS info too long (%zu)\n", pdp_info->qos_enc_len); continue; } LOGVSUBP(LOGL_INFO, vsub, "Will set PDP info, context id = %zu, APN = %s\n", ctx_id, osmo_hexdump(pdp_info->apn_enc, pdp_info->apn_enc_len)); /* Set PDP info [ctx_id] */ pdp_data = vlr_subscr_pdp_data_get_by_id(vsub, ctx_id); if (!pdp_data) { pdp_data = vlr_subscr_pdp_data_alloc(vsub); pdp_data->context_id = ctx_id; } OSMO_ASSERT(pdp_data != NULL); pdp_data->pdp_type = pdp_info->pdp_type; osmo_apn_to_str(pdp_data->apn_str, pdp_info->apn_enc, pdp_info->apn_enc_len); memcpy(pdp_data->qos_subscribed, pdp_info->qos_enc, pdp_info->qos_enc_len); pdp_data->qos_subscribed_len = pdp_info->qos_enc_len; } } /* Handle InsertSubscrData Result from HLR */ static int vlr_subscr_handle_isd_req(struct vlr_subscr *vsub, const struct osmo_gsup_message *gsup) { struct osmo_gsup_message gsup_reply = {0}; vlr_subscr_gsup_insert_data(vsub, gsup); vsub->vlr->ops.subscr_update(vsub); gsup_reply.message_type = OSMO_GSUP_MSGT_INSERT_DATA_RESULT; return vlr_subscr_tx_gsup_message(vsub, &gsup_reply); } /* Handle UpdateLocation Result from HLR */ static int vlr_subscr_handle_lu_res(struct vlr_subscr *vsub, const struct osmo_gsup_message *gsup) { if (!vsub->lu_fsm) { LOGVSUBP(LOGL_ERROR, vsub, "Rx GSUP LU Result " "without LU in progress\n"); return -ENODEV; } /* contrary to MAP, we allow piggy-backing subscriber data onto the * UPDATE LOCATION RESULT, and don't mandate the use of a separate * nested INSERT SUBSCRIBER DATA transaction */ vlr_subscr_gsup_insert_data(vsub, gsup); osmo_fsm_inst_dispatch(vsub->lu_fsm, VLR_ULA_E_HLR_LU_RES, NULL); return 0; } /* Handle UpdateLocation Result from HLR */ static int vlr_subscr_handle_lu_err(struct vlr_subscr *vsub, const struct osmo_gsup_message *gsup) { if (!vsub->lu_fsm) { LOGVSUBP(LOGL_ERROR, vsub, "Rx GSUP LU Error " "without LU in progress\n"); return -ENODEV; } LOGVSUBP(LOGL_DEBUG, vsub, "UpdateLocation failed; gmm_cause: %s\n", get_value_string(gsm48_gmm_cause_names, gsup->cause)); osmo_fsm_inst_dispatch(vsub->lu_fsm, VLR_ULA_E_HLR_LU_RES, (void *)&gsup->cause); return 0; } static void gmm_cause_to_fsm_and_mm_cause(enum gsm48_gmm_cause gmm_cause, enum osmo_fsm_term_cause *fsm_cause_p, enum gsm48_reject_value *gsm48_rej_p) { enum osmo_fsm_term_cause fsm_cause = OSMO_FSM_TERM_ERROR; enum gsm48_reject_value gsm48_rej = GSM48_REJECT_NETWORK_FAILURE; switch (gmm_cause) { case GMM_CAUSE_IMSI_UNKNOWN: gsm48_rej = GSM48_REJECT_IMSI_UNKNOWN_IN_HLR; break; case GMM_CAUSE_ILLEGAL_MS: gsm48_rej = GSM48_REJECT_ILLEGAL_MS; break; case GMM_CAUSE_IMEI_NOT_ACCEPTED: gsm48_rej = GSM48_REJECT_IMEI_NOT_ACCEPTED; break; case GMM_CAUSE_ILLEGAL_ME: gsm48_rej = GSM48_REJECT_ILLEGAL_ME; break; case GMM_CAUSE_GPRS_NOTALLOWED: gsm48_rej = GSM48_REJECT_GPRS_NOT_ALLOWED; break; case GMM_CAUSE_GPRS_OTHER_NOTALLOWED: gsm48_rej = GSM48_REJECT_SERVICES_NOT_ALLOWED; break; case GMM_CAUSE_MS_ID_NOT_DERIVED: gsm48_rej = GSM48_REJECT_MS_IDENTITY_NOT_DERVIVABLE; break; case GMM_CAUSE_IMPL_DETACHED: gsm48_rej = GSM48_REJECT_IMPLICITLY_DETACHED; break; case GMM_CAUSE_PLMN_NOTALLOWED: gsm48_rej = GSM48_REJECT_PLMN_NOT_ALLOWED; break; case GMM_CAUSE_LA_NOTALLOWED: gsm48_rej = GSM48_REJECT_LOC_NOT_ALLOWED; break; case GMM_CAUSE_ROAMING_NOTALLOWED: gsm48_rej = GSM48_REJECT_ROAMING_NOT_ALLOWED; break; case GMM_CAUSE_NO_GPRS_PLMN: gsm48_rej = GSM48_REJECT_GPRS_NOT_ALLOWED_IN_PLMN; break; case GMM_CAUSE_MSC_TEMP_NOTREACH: gsm48_rej = GSM48_REJECT_MSC_TMP_NOT_REACHABLE; break; case GMM_CAUSE_SYNC_FAIL: gsm48_rej = GSM48_REJECT_SYNCH_FAILURE; break; case GMM_CAUSE_CONGESTION: gsm48_rej = GSM48_REJECT_CONGESTION; break; case GMM_CAUSE_SEM_INCORR_MSG: gsm48_rej = GSM48_REJECT_INCORRECT_MESSAGE; break; case GMM_CAUSE_INV_MAND_INFO: gsm48_rej = GSM48_REJECT_INVALID_MANDANTORY_INF; break; case GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL: gsm48_rej = GSM48_REJECT_MSG_TYPE_NOT_IMPLEMENTED; break; case GMM_CAUSE_MSGT_INCOMP_P_STATE: gsm48_rej = GSM48_REJECT_MSG_TYPE_NOT_COMPATIBLE; break; case GMM_CAUSE_IE_NOTEXIST_NOTIMPL: gsm48_rej = GSM48_REJECT_INF_ELEME_NOT_IMPLEMENTED; break; case GMM_CAUSE_COND_IE_ERR: gsm48_rej = GSM48_REJECT_CONDTIONAL_IE_ERROR; break; case GMM_CAUSE_MSG_INCOMP_P_STATE: gsm48_rej = GSM48_REJECT_MSG_NOT_COMPATIBLE; break; case GMM_CAUSE_PROTO_ERR_UNSPEC: gsm48_rej = GSM48_REJECT_PROTOCOL_ERROR; break; case GMM_CAUSE_NO_SUIT_CELL_IN_LA: case GMM_CAUSE_MAC_FAIL: case GMM_CAUSE_GSM_AUTH_UNACCEPT: case GMM_CAUSE_NOT_AUTH_FOR_CSG: case GMM_CAUSE_SMS_VIA_GPRS_IN_RA: case GMM_CAUSE_NO_PDP_ACTIVATED: case GMM_CAUSE_NET_FAIL: gsm48_rej = GSM48_REJECT_NETWORK_FAILURE; break; } switch (gmm_cause) { /* refine any error causes here? */ default: fsm_cause = OSMO_FSM_TERM_ERROR; break; } if (fsm_cause_p) *fsm_cause_p = fsm_cause; if (gsm48_rej_p) *gsm48_rej_p = gsm48_rej; } /* Handle LOCATION CANCEL request from HLR */ static int vlr_subscr_handle_cancel_req(struct vlr_subscr *vsub, struct osmo_gsup_message *gsup_msg) { enum gsm48_reject_value gsm48_rej; enum osmo_fsm_term_cause fsm_cause; struct osmo_gsup_message gsup_reply = {0}; int rc, is_update_procedure = !gsup_msg->cancel_type || gsup_msg->cancel_type == OSMO_GSUP_CANCEL_TYPE_UPDATE; LOGVSUBP(LOGL_INFO, vsub, "Cancelling MS subscriber (%s)\n", is_update_procedure ? "update procedure" : "subscription withdraw"); gsup_reply.message_type = OSMO_GSUP_MSGT_LOCATION_CANCEL_RESULT; rc = vlr_subscr_tx_gsup_message(vsub, &gsup_reply); gmm_cause_to_fsm_and_mm_cause(gsup_msg->cause, &fsm_cause, &gsm48_rej); vlr_subscr_cancel_attach_fsm(vsub, fsm_cause, gsm48_rej); vlr_subscr_rx_imsi_detach(vsub); return rc; } /* Incoming handler for GSUP from HLR. * Keep this function non-static for direct invocation by unit tests. */ int vlr_gsupc_read_cb(struct osmo_gsup_client *gsupc, struct msgb *msg) { struct vlr_instance *vlr = (struct vlr_instance *) gsupc->data; struct vlr_subscr *vsub; struct osmo_gsup_message gsup; int rc; DEBUGP(DVLR, "GSUP rx %u: %s\n", msgb_l2len(msg), osmo_hexdump_nospc(msgb_l2(msg), msgb_l2len(msg))); rc = osmo_gsup_decode(msgb_l2(msg), msgb_l2len(msg), &gsup); if (rc < 0) { LOGP(DVLR, LOGL_ERROR, "decoding GSUP message fails with error '%s' (%d)\n", get_value_string(gsm48_gmm_cause_names, -rc), -rc); goto msgb_free_and_return; } if (!gsup.imsi[0]) { LOGP(DVLR, LOGL_ERROR, "Missing IMSI in GSUP message\n"); if (OSMO_GSUP_IS_MSGT_REQUEST(gsup.message_type)) { rc = vlr_tx_gsup_error_reply(vlr, &gsup, GMM_CAUSE_INV_MAND_INFO); if (rc < 0) LOGP(DVLR, LOGL_ERROR, "Failed to send error reply for IMSI %s\n", gsup.imsi); } rc = -GMM_CAUSE_INV_MAND_INFO; goto msgb_free_and_return; } vsub = vlr_subscr_find_by_imsi(vlr, gsup.imsi); if (!vsub) { switch (gsup.message_type) { case OSMO_GSUP_MSGT_PURGE_MS_RESULT: case OSMO_GSUP_MSGT_PURGE_MS_ERROR: rc = vlr_rx_gsup_purge_no_subscr(vlr, &gsup); goto msgb_free_and_return; default: rc = vlr_rx_gsup_unknown_imsi(vlr, &gsup); goto msgb_free_and_return; } } switch (gsup.message_type) { case OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: case OSMO_GSUP_MSGT_SEND_AUTH_INFO_ERROR: rc = vlr_subscr_handle_sai_res(vsub, &gsup); break; case OSMO_GSUP_MSGT_INSERT_DATA_REQUEST: rc = vlr_subscr_handle_isd_req(vsub, &gsup); break; case OSMO_GSUP_MSGT_LOCATION_CANCEL_REQUEST: rc = vlr_subscr_handle_cancel_req(vsub, &gsup); break; case OSMO_GSUP_MSGT_UPDATE_LOCATION_RESULT: rc = vlr_subscr_handle_lu_res(vsub, &gsup); break; case OSMO_GSUP_MSGT_UPDATE_LOCATION_ERROR: rc = vlr_subscr_handle_lu_err(vsub, &gsup); break; case OSMO_GSUP_MSGT_PURGE_MS_ERROR: case OSMO_GSUP_MSGT_PURGE_MS_RESULT: case OSMO_GSUP_MSGT_DELETE_DATA_REQUEST: LOGVSUBP(LOGL_ERROR, vsub, "Rx GSUP msg_type=%d not yet implemented\n", gsup.message_type); rc = -GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL; break; default: /* Forward message towards MSC */ rc = vlr->ops.forward_gsup_msg(vsub, &gsup); break; } vlr_subscr_put(vsub); msgb_free_and_return: msgb_free(msg); return rc; } /* MSC->VLR: Subscriber has provided IDENTITY RESPONSE */ int vlr_subscr_rx_id_resp(struct vlr_subscr *vsub, const uint8_t *mi, size_t mi_len) { char mi_string[GSM48_MI_SIZE]; uint8_t mi_type = mi[0] & GSM_MI_TYPE_MASK; gsm48_mi_to_string(mi_string, sizeof(mi_string), mi, mi_len); /* update the vlr_subscr with the given identity */ switch (mi_type) { case GSM_MI_TYPE_IMSI: if (strlen(mi_string) >= sizeof(vsub->imsi)) { LOGVSUBP(LOGL_ERROR, vsub, "IMSI in ID RESP too long (>%zu bytes): %s\n", sizeof(vsub->imsi) - 1, mi_string); return -ENOSPC; /* ignore message; do not avance LU FSM */ } else if (vsub->imsi[0] && !vlr_subscr_matches_imsi(vsub, mi_string)) { LOGVSUBP(LOGL_ERROR, vsub, "IMSI in ID RESP differs:" " %s\n", mi_string); /* XXX Should we return an error, e.g. -EINVAL ? */ } else vlr_subscr_set_imsi(vsub, mi_string); break; case GSM_MI_TYPE_IMEI: vlr_subscr_set_imei(vsub, mi_string); break; case GSM_MI_TYPE_IMEISV: vlr_subscr_set_imeisv(vsub, mi_string); break; } if (vsub->auth_fsm) { switch (mi_type) { case GSM_MI_TYPE_IMSI: osmo_fsm_inst_dispatch(vsub->auth_fsm, VLR_AUTH_E_MS_ID_IMSI, mi_string); break; } } if (vsub->lu_fsm) { uint32_t event = 0; switch (mi_type) { case GSM_MI_TYPE_IMSI: event = VLR_ULA_E_ID_IMSI; break; case GSM_MI_TYPE_IMEI: event = VLR_ULA_E_ID_IMEI; break; case GSM_MI_TYPE_IMEISV: event = VLR_ULA_E_ID_IMEISV; break; default: OSMO_ASSERT(0); break; } osmo_fsm_inst_dispatch(vsub->lu_fsm, event, mi_string); } else { LOGVSUBP(LOGL_NOTICE, vsub, "gratuitous ID RESPONSE?!?\n"); } return 0; } /* MSC->VLR: Subscriber has provided IDENTITY RESPONSE */ int vlr_subscr_rx_tmsi_reall_compl(struct vlr_subscr *vsub) { if (vsub->lu_fsm) { return osmo_fsm_inst_dispatch(vsub->lu_fsm, VLR_ULA_E_NEW_TMSI_ACK, NULL); } else if (vsub->proc_arq_fsm) { return osmo_fsm_inst_dispatch(vsub->proc_arq_fsm, PR_ARQ_E_TMSI_ACK, NULL); } else { LOGVSUBP(LOGL_NOTICE, vsub, "gratuitous TMSI REALLOC COMPL"); return -EINVAL; } } bool vlr_subscr_expire(struct vlr_subscr *vsub) { if (vsub->lu_complete) { /* balancing the get from vlr_lu_compl_fsm_success() */ vsub->lu_complete = false; vlr_subscr_put(vsub); return true; } return false; } /* See TS 23.012 version 9.10.0 4.3.2.1 "Process Detach_IMSI_VLR" */ int vlr_subscr_rx_imsi_detach(struct vlr_subscr *vsub) { /* paranoia: should any LU or PARQ FSMs still be running, stop them. */ vlr_subscr_cancel_attach_fsm(vsub, OSMO_FSM_TERM_ERROR, GSM48_REJECT_CONGESTION); vsub->imsi_detached_flag = true; vsub->expire_lu = VLR_SUBSCRIBER_NO_EXPIRATION; vlr_subscr_expire(vsub); return 0; } /* Tear down any running FSMs due to MSC connection timeout. * Visit all vsub->*_fsm pointers and give them a queue to send a final reject * message before the entire connection is torn down. * \param[in] vsub subscriber to tear down */ void vlr_ran_conn_timeout(struct vlr_subscr *vsub) { vlr_subscr_cancel_attach_fsm(vsub, OSMO_FSM_TERM_TIMEOUT, GSM48_REJECT_CONGESTION); } struct vlr_instance *vlr_alloc(void *ctx, const struct vlr_ops *ops) { struct vlr_instance *vlr = talloc_zero(ctx, struct vlr_instance); OSMO_ASSERT(vlr); /* Some of these are needed only on UTRAN, but in case the caller wants * only GERAN, she should just provide dummy callbacks. */ OSMO_ASSERT(ops->tx_auth_req); OSMO_ASSERT(ops->tx_auth_rej); OSMO_ASSERT(ops->tx_id_req); OSMO_ASSERT(ops->tx_lu_acc); OSMO_ASSERT(ops->tx_lu_rej); OSMO_ASSERT(ops->tx_cm_serv_acc); OSMO_ASSERT(ops->tx_cm_serv_rej); OSMO_ASSERT(ops->set_ciph_mode); OSMO_ASSERT(ops->tx_common_id); OSMO_ASSERT(ops->subscr_update); OSMO_ASSERT(ops->subscr_assoc); OSMO_ASSERT(ops->forward_gsup_msg); INIT_LLIST_HEAD(&vlr->subscribers); INIT_LLIST_HEAD(&vlr->operations); memcpy(&vlr->ops, ops, sizeof(vlr->ops)); /* defaults */ vlr->cfg.assign_tmsi = true; /* osmo_auth_fsm.c */ osmo_fsm_register(&vlr_auth_fsm); /* osmo_lu_fsm.c */ vlr_lu_fsm_init(); /* vlr_access_request_fsm.c */ vlr_parq_fsm_init(); return vlr; } int vlr_start(struct ipaccess_unit *ipa_dev, struct vlr_instance *vlr, const char *gsup_server_addr_str, uint16_t gsup_server_port) { OSMO_ASSERT(vlr); vlr->gsup_client = osmo_gsup_client_create2(vlr, ipa_dev, gsup_server_addr_str, gsup_server_port, &vlr_gsupc_read_cb, NULL); if (!vlr->gsup_client) return -ENOMEM; vlr->gsup_client->data = vlr; osmo_timer_setup(&vlr->lu_expire_timer, vlr_subscr_expire_lu, vlr); osmo_timer_schedule(&vlr->lu_expire_timer, VLR_SUBSCRIBER_LU_EXPIRATION_INTERVAL, 0); return 0; } /* MSC->VLR: Subscribre has disconnected */ int vlr_subscr_disconnected(struct vlr_subscr *vsub) { /* This corresponds to a MAP-ABORT from MSC->VLR on a classic B * interface */ osmo_fsm_inst_term(vsub->lu_fsm, OSMO_FSM_TERM_REQUEST, NULL); osmo_fsm_inst_term(vsub->auth_fsm, OSMO_FSM_TERM_REQUEST, NULL); vsub->msc_conn_ref = NULL; return 0; } /* MSC->VLR: Receive Authentication Failure from Subscriber */ int vlr_subscr_rx_auth_fail(struct vlr_subscr *vsub, const uint8_t *auts) { struct vlr_auth_resp_par par = {0}; par.auts = auts; osmo_fsm_inst_dispatch(vsub->auth_fsm, VLR_AUTH_E_MS_AUTH_FAIL, &par); return 0; } /* MSC->VLR: Receive Authentication Response from MS * \returns 1 in case of success, 0 in case of delay, -1 on auth error */ int vlr_subscr_rx_auth_resp(struct vlr_subscr *vsub, bool is_r99, bool is_utran, const uint8_t *res, uint8_t res_len) { struct osmo_fsm_inst *auth_fi = vsub->auth_fsm; struct vlr_auth_resp_par par; par.is_r99 = is_r99; par.is_utran = is_utran; par.res = res; par.res_len = res_len; osmo_fsm_inst_dispatch(auth_fi, VLR_AUTH_E_MS_AUTH_RESP, (void *) &par); return 0; } /* MSC->VLR: Receive result of Ciphering Mode Command from MS */ void vlr_subscr_rx_ciph_res(struct vlr_subscr *vsub, struct vlr_ciph_result *res) { if (vsub->lu_fsm && vsub->lu_fsm->state == VLR_ULA_S_WAIT_CIPH) osmo_fsm_inst_dispatch(vsub->lu_fsm, VLR_ULA_E_CIPH_RES, res); if (vsub->proc_arq_fsm && vsub->proc_arq_fsm->state == PR_ARQ_S_WAIT_CIPH) osmo_fsm_inst_dispatch(vsub->proc_arq_fsm, PR_ARQ_E_CIPH_RES, res); } /* Internal evaluation of requested ciphering mode. * Send set_ciph_mode() to MSC depending on the ciph_mode argument. * \param[in] vlr VLR instance. * \param[in] fi Calling FSM instance, for logging. * \param[in] msc_conn_ref MSC conn to send to. * \param[in] ciph_mode Ciphering config, to decide whether to do ciphering. * \returns 0 if no ciphering is needed or message was sent successfully, * or a negative value if ciph_mode is invalid or sending failed. */ int vlr_set_ciph_mode(struct vlr_instance *vlr, struct osmo_fsm_inst *fi, void *msc_conn_ref, bool ciph_required, bool umts_aka, bool retrieve_imeisv) { if (!ciph_required) return 0; LOGPFSML(fi, LOGL_DEBUG, "Set Ciphering Mode\n"); return vlr->ops.set_ciph_mode(msc_conn_ref, umts_aka, retrieve_imeisv); } /* Decide whether UMTS AKA should be used. * UTRAN networks are by definition R99 capable, and the auth vector is required to contain UMTS AKA * tokens. This is expected to be verified by the caller. On GERAN, UMTS AKA must be used iff MS and * GERAN are R99 capable and UMTS AKA tokens are available. * \param[in] vec Auth tokens (received from the HLR). * \param[in] is_r99 True when BTS and GERAN are R99 capable. * \returns true to use UMTS AKA, false to use pre-R99 GSM AKA. */ bool vlr_use_umts_aka(struct osmo_auth_vector *vec, bool is_r99) { if (!is_r99) return false; if (!(vec->auth_types & OSMO_AUTH_TYPE_UMTS)) return false; return true; } void log_set_filter_vlr_subscr(struct log_target *target, struct vlr_subscr *vlr_subscr) { struct vlr_subscr **fsub = (void*)&target->filter_data[LOG_FLT_VLR_SUBSCR]; /* free the old data */ if (*fsub) { vlr_subscr_put(*fsub); *fsub = NULL; } if (vlr_subscr) { target->filter_map |= (1 << LOG_FLT_VLR_SUBSCR); *fsub = vlr_subscr_get(vlr_subscr); } else target->filter_map &= ~(1 << LOG_FLT_VLR_SUBSCR); }