diff options
Diffstat (limited to 'openbsc/src/libvlr/vlr.c')
| -rw-r--r-- | openbsc/src/libvlr/vlr.c | 795 |
1 files changed, 795 insertions, 0 deletions
diff --git a/openbsc/src/libvlr/vlr.c b/openbsc/src/libvlr/vlr.c new file mode 100644 index 000000000..9edfc0acd --- /dev/null +++ b/openbsc/src/libvlr/vlr.c @@ -0,0 +1,795 @@ +/* Osmocom Visitor Location Register (VLR) code base */ + +/* (C) 2016 by Harald Welte <laforge@gnumonks.org> + * + * 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 <http://www.gnu.org/licenses/>. + * + */ + +#include <osmocom/core/linuxlist.h> +#include <osmocom/core/fsm.h> +#include <osmocom/gsm/protocol/gsm_04_08_gprs.h> +#include <osmocom/gsm/gsup.h> +#include <osmocom/gsm/apn.h> +#include <openbsc/gsm_subscriber.h> +#include <openbsc/gprs_gsup_client.h> +#include <openbsc/vlr.h> +#include <openbsc/gprs_sgsn.h> +#include <openbsc/gprs_utils.h> +#include <openbsc/debug.h> + +#include <openssl/rand.h> + +#include <netinet/in.h> +#include <arpa/inet.h> + +#include "vlr_core.h" +#include "vlr_auth_fsm.h" +#include "vlr_access_req_fsm.h" +#include "vlr_lu_fsm.h" + +#define SGSN_SUBSCR_MAX_RETRIES 3 +#define SGSN_SUBSCR_RETRY_INTERVAL 10 + +/*********************************************************************** + * Convenience functions + ***********************************************************************/ + +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_sub_name(struct vlr_subscriber *vsub) +{ + static char buf[32]; + if (vsub->imsi[0]) + strncpy(buf, vsub->imsi, sizeof(buf)); + else + snprintf(buf, sizeof(buf), "0x%08x", vsub->tmsi); + buf[sizeof(buf)-1] = '\0'; + return buf; +} + +struct vlr_subscriber * +vlr_subscr_find_by_imsi(struct vlr_instance *vlr, const char *imsi) +{ + struct vlr_subscriber *vsub; + + llist_for_each_entry(vsub, &vlr->subscribers, list) { + if (!strcmp(vsub->imsi, imsi)) + return vsub; + } + return NULL; +} + +struct vlr_subscriber * +vlr_subscr_find_by_tmsi(struct vlr_instance *vlr, uint32_t tmsi) +{ + struct vlr_subscriber *vsub; + + llist_for_each_entry(vsub, &vlr->subscribers, list) { + if (vsub->tmsi == tmsi) + return vsub; + } + return NULL; +} + +/* Transmit GSUP message to HLR */ +static int vlr_tx_gsup_message(struct vlr_instance *vlr, + struct osmo_gsup_message *gsup_msg) +{ + struct msgb *msg = gprs_gsup_msgb_alloc(); + + osmo_gsup_encode(msg, gsup_msg); + + 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, + "Sending GSUP, will send: %s\n", msgb_hexdump(msg)); + + return gprs_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(struct vlr_subscriber *vsub, + struct osmo_gsup_message *gsup_msg) +{ + struct vlr_instance *vlr = vsub->vlr; + + if (strlen(gsup_msg->imsi) == 0) + strncpy(gsup_msg->imsi, vsub->imsi, sizeof(gsup_msg->imsi) - 1); + + return vlr_tx_gsup_message(vlr, gsup_msg); +} + +/* Transmit GSUP error in response to original message */ +static int vlr_tx_gsup_error_reply(struct vlr_instance *vlr, + struct osmo_gsup_message *gsup_orig, + enum gsm48_gmm_cause cause) +{ + struct osmo_gsup_message gsup_reply = {0}; + + strncpy(gsup_reply.imsi, gsup_orig->imsi, sizeof(gsup_reply.imsi) - 1); + 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); +} + +/* Allocate a new subscriber and insert it into list */ +struct vlr_subscriber *vlr_sub_alloc(struct vlr_instance *vlr) +{ + struct vlr_subscriber *vsub; + int i; + + vsub = talloc_zero(vlr, struct vlr_subscriber); + vsub->vlr = vlr; + vsub->tmsi = GSM_RESERVED_TMSI; + + for (i = 0; i < ARRAY_SIZE(vsub->auth_tuples); i++) + vsub->auth_tuples[i].key_seq = GSM_KEY_SEQ_INVAL; + + INIT_LLIST_HEAD(&vsub->ps.pdp_list); + + llist_add_tail(&vsub->list, &vlr->subscribers); + + /* Do not add to list of subscribers yet, as we don't yet want this + * subscriber to be found by lookup from e.g. MT-SMS or MT-call + * delivery yet. */ + + return vsub; +} + +static int vlr_sub_purge(struct vlr_subscriber *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_sub_cleanup(struct vlr_subscriber *vsub) +{ + if (vsub->flags & GPRS_SUBSCRIBER_ENABLE_PURGE) { + vlr_sub_purge(vsub); + vsub->flags &= ~GPRS_SUBSCRIBER_ENABLE_PURGE; + } +} + +void vlr_sub_cancel(struct vlr_subscriber *vsub) +{ + vsub->authorized = 0; + vsub->flags |= GPRS_SUBSCRIBER_CANCELLED; + vsub->flags &= ~GPRS_SUBSCRIBER_ENABLE_PURGE; + + vsub->vlr->ops.subscr_update(vsub); + vlr_sub_cleanup(vsub); +} + +int vlr_sub_alloc_tmsi(struct vlr_subscriber *vsub) +{ + struct vlr_instance *vlr = vsub->vlr; + uint32_t tmsi; + + for (;;) { + if (RAND_bytes((uint8_t *) &tmsi, sizeof(tmsi)) != 1) { + LOGP(DVLR, LOGL_ERROR, "RAND_bytes failed\n"); + return -1; + } + /* 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 (!vlr_subscr_find_by_tmsi(vlr, tmsi)) { + vsub->tmsi = tmsi; + return 0; + } + } + + /* not reached */ + return -1; +} + +/*********************************************************************** + * PDP context data + ***********************************************************************/ + +struct sgsn_subscriber_pdp_data * +vlr_sub_pdp_data_alloc(struct vlr_subscriber *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_sub_pdp_data_clear(struct vlr_subscriber *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_sub_pdp_data_get_by_id(struct vlr_subscriber *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)) { + vlr_tx_gsup_error_reply(vlr, gsup_msg, + GMM_CAUSE_IMSI_UNKNOWN); + 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_sub_req_lu(struct vlr_subscriber *vsub, bool is_ps) +{ + struct osmo_gsup_message gsup_msg = {0}; + int rc; + + gsup_msg.message_type = OSMO_GSUP_MSGT_UPDATE_LOCATION_REQUEST; + rc = vlr_subscr_tx_gsup_message(vsub, &gsup_msg); + + return rc; +} + +/* VLR internal call to request tuples from HLR */ +int vlr_sub_req_sai(struct vlr_subscriber *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_sub_tx_auth_fail_rep(struct vlr_subscriber *vsub) +{ + struct osmo_gsup_message gsup_msg = {0}; + + gsup_msg.message_type = OSMO_GSUP_MSGT_AUTH_FAIL_REPORT; + strncpy(gsup_msg.imsi, vsub->imsi, sizeof(gsup_msg.imsi) - 1); + return vlr_tx_gsup_message(vsub->vlr, &gsup_msg); +} + +/* Update the subscriber with GSUP-received auth tuples */ +void vlr_sub_update_tuples(struct vlr_subscriber *vsub, + const struct osmo_gsup_message *gsup) +{ + unsigned int i; + + LOGVSUBP(LOGL_DEBUG, vsub, "Adding %zu auth tuples\n", + gsup->num_auth_vectors); + + 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 = GSM_KEY_SEQ_INVAL; + } + + 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; + } + + vsub->auth_tuples_updated = true; + vsub->auth_error_cause = SGSN_ERROR_CAUSE_NONE; +} + +/* Handle SendAuthInfo Result/Error from HLR */ +static int vlr_sub_handle_sai_res(struct vlr_subscriber *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 void vlr_sub_gsup_insert_data(struct vlr_subscriber *vsub, + const struct osmo_gsup_message *gsup_msg) +{ + unsigned idx; + int rc; + + if (gsup_msg->msisdn_enc) { + gsm48_mi_to_string(vsub->msisdn, sizeof(vsub->msisdn), + gsup_msg->msisdn_enc, + gsup_msg->msisdn_enc_len); + } + + 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_sub_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_sub_pdp_data_get_by_id(vsub, ctx_id); + if (!pdp_data) { + pdp_data = vlr_sub_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_sub_handle_isd_req(struct vlr_subscriber *vsub, + const struct osmo_gsup_message *gsup) +{ + struct osmo_gsup_message gsup_reply = {0}; + + vlr_sub_gsup_insert_data(vsub, gsup); + + vsub->authorized = 1; + vsub->auth_error_cause = SGSN_ERROR_CAUSE_NONE; + vsub->flags |= GPRS_SUBSCRIBER_ENABLE_PURGE; + 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_sub_handle_lu_res(struct vlr_subscriber *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_sub_gsup_insert_data(vsub, gsup); + + vsub->authorized = 1; + vsub->auth_error_cause = SGSN_ERROR_CAUSE_NONE; + vsub->flags |= GPRS_SUBSCRIBER_ENABLE_PURGE; + vsub->vlr->ops.subscr_update(vsub); + + osmo_fsm_inst_dispatch(vsub->lu_fsm, VLR_ULA_E_HLR_LU_RES, NULL); + + return 0; +} + +/* Handle UpdateLocation Result from HLR */ +static int vlr_sub_handle_lu_err(struct vlr_subscriber *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)); + + vsub->authorized = 0; + vsub->auth_error_cause = gsup->cause; + + osmo_fsm_inst_dispatch(vsub->lu_fsm, VLR_ULA_E_HLR_LU_RES, + (void *)&gsup->cause); + + return 0; +} + +/* Handel LOCATION CANCEL request from HLR */ +static int vlr_sub_handle_cancel_req(struct vlr_subscriber *vsub, + struct osmo_gsup_message *gsup_msg) +{ + struct osmo_gsup_message gsup_reply = {0}; + int 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; + vlr_subscr_tx_gsup_message(vsub, &gsup_reply); + + if (is_update_procedure) + vsub->auth_error_cause = SGSN_ERROR_CAUSE_NONE; + else + /* Since a withdraw cause is not specified, just abort the + * current attachment. The following re-attachment should then + * be rejected with a proper cause value. + */ + vsub->auth_error_cause = GMM_CAUSE_IMPL_DETACHED; + + vlr_sub_cancel(vsub); + + return 0; +} + +/* Incoming handler for GSUP from HLR */ +static int vlr_gsupc_read_cb(struct gprs_gsup_client *gsupc, struct msgb *msg) +{ + struct vlr_instance *vlr = (struct vlr_instance *) gsupc->data; + struct vlr_subscriber *vsub; + struct osmo_gsup_message gsup; + int rc; + + 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); + return rc; + } + + if (!gsup.imsi[0]) { + LOGP(DVLR, LOGL_ERROR, "Missing IMSI in GSUP message\n"); + if (OSMO_GSUP_IS_MSGT_REQUEST(gsup.message_type)) + vlr_tx_gsup_error_reply(vlr, &gsup, + GMM_CAUSE_INV_MAND_INFO); + return -GMM_CAUSE_INV_MAND_INFO; + } + + 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: + return vlr_rx_gsup_purge_no_subscr(vlr, &gsup); + default: + return vlr_rx_gsup_unknown_imsi(vlr, &gsup); + } + } + + switch (gsup.message_type) { + case OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: + case OSMO_GSUP_MSGT_SEND_AUTH_INFO_ERROR: + rc = vlr_sub_handle_sai_res(vsub, &gsup); + break; + case OSMO_GSUP_MSGT_INSERT_DATA_REQUEST: + rc = vlr_sub_handle_isd_req(vsub, &gsup); + break; + case OSMO_GSUP_MSGT_LOCATION_CANCEL_REQUEST: + rc = vlr_sub_handle_cancel_req(vsub, &gsup); + break; + case OSMO_GSUP_MSGT_UPDATE_LOCATION_RESULT: + rc = vlr_sub_handle_lu_res(vsub, &gsup); + break; + case OSMO_GSUP_MSGT_UPDATE_LOCATION_ERROR: + rc = vlr_sub_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: + LOGVSUBP(LOGL_ERROR, vsub, + "Rx GSUP msg_type=%d not valid at VLR/SGSN side\n", + gsup.message_type); + rc = -GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL; + break; + } + + return rc; +} + +/* MSC->VLR: Subscriber has provided IDENTITY RESPONSE */ +int vlr_sub_rx_id_resp(struct vlr_subscriber *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_subscriber with the given identity */ + switch (mi_type) { + case GSM_MI_TYPE_IMSI: + if (vsub->imsi[0] && strcmp(vsub->imsi, mi_string)) { + LOGVSUBP(LOGL_ERROR, vsub, "IMSI in ID RESP differs:" + " %s\n", mi_string); + } else { + strncpy(vsub->imsi, mi_string, sizeof(vsub->imsi)); + vsub->imsi[sizeof(vsub->imsi)-1] = '\0'; + } + break; + case GSM_MI_TYPE_IMEI: + strncpy(vsub->imei, mi_string, sizeof(vsub->imei)); + vsub->imei[sizeof(vsub->imei)-1] = '\0'; + break; + case GSM_MI_TYPE_IMEISV: + strncpy(vsub->imeisv, mi_string, sizeof(vsub->imeisv)); + vsub->imeisv[sizeof(vsub->imeisv)-1] = '\0'; + 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 */ +void vlr_sub_rx_tmsi_reall_compl(struct vlr_subscriber *vsub) +{ + if (vsub->lu_fsm) { + osmo_fsm_inst_dispatch(vsub->lu_fsm, + VLR_ULA_E_NEW_TMSI_ACK, NULL); + } else if (vsub->proc_arq_fsm) { + osmo_fsm_inst_dispatch(vsub->proc_arq_fsm, + PR_ARQ_E_TMSI_ACK, NULL); + } else { + LOGVSUBP(LOGL_NOTICE, vsub, + "gratuitous TMSI REALLOC COMPL"); + } +} + +struct vlr_instance *vlr_init(void *ctx, const struct vlr_ops *ops, + const char *addr_str, uint16_t port) +{ + struct vlr_instance *vlr = talloc_zero(ctx, struct vlr_instance); + OSMO_ASSERT(vlr); + + vlr->gsup_client = gprs_gsup_client_create(addr_str, port, &vlr_gsupc_read_cb, NULL); + if (!vlr->gsup_client) { + talloc_free(vlr); + return NULL; + } + vlr->gsup_client->data = vlr; + + INIT_LLIST_HEAD(&vlr->subscribers); + INIT_LLIST_HEAD(&vlr->operations); + memcpy(&vlr->ops, ops, sizeof(vlr->ops)); + + /* osmo_auth_fsm.c */ + osmo_fsm_register(&vlr_auth_fsm); + /* osmo_lu_fsm.c */ + vlr_lu_fsm_init(); + + return vlr; +} + +/* MSC->VLR: Subscribre has disconnected */ +int vlr_sub_disconnected(struct vlr_subscriber *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_sub_rx_auth_fail(struct vlr_subscriber *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_sub_rx_auth_resp(struct vlr_subscriber *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; +} |