diff options
Diffstat (limited to 'src/gprs/gprs_subscriber.c')
-rw-r--r-- | src/gprs/gprs_subscriber.c | 921 |
1 files changed, 921 insertions, 0 deletions
diff --git a/src/gprs/gprs_subscriber.c b/src/gprs/gprs_subscriber.c new file mode 100644 index 000000000..1bb51418a --- /dev/null +++ b/src/gprs/gprs_subscriber.c @@ -0,0 +1,921 @@ +/* MS subscriber data handling */ + +/* (C) 2014 by sysmocom s.f.m.c. GmbH + * (C) 2015 by Holger Hans Peter Freyther + * + * 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/gsm/protocol/gsm_04_08_gprs.h> +#include <osmocom/gsm/gsup.h> +#include <osmocom/core/utils.h> +#include <osmocom/core/logging.h> +#include <openbsc/gprs_subscriber.h> +#include <openbsc/gsup_client.h> + +#include <openbsc/sgsn.h> +#include <openbsc/gprs_sgsn.h> +#include <openbsc/gprs_gmm.h> +#include <openbsc/gprs_utils.h> + +#include <openbsc/debug.h> + +#include <netinet/in.h> +#include <arpa/inet.h> +#include <limits.h> + +#define SGSN_SUBSCR_MAX_RETRIES 3 +#define SGSN_SUBSCR_RETRY_INTERVAL 10 + +#define LOGGSUPP(level, gsup, fmt, args...) \ + LOGP(DGPRS, level, "GSUP(%s) " fmt, \ + (gsup)->imsi, \ + ## args) + +extern void *tall_bsc_ctx; + +LLIST_HEAD(_gprs_subscribers); +struct llist_head * const gprs_subscribers = &_gprs_subscribers; + +static int gsup_read_cb(struct gsup_client *gsupc, struct msgb *msg); + +/* TODO: Some functions are specific to the SGSN, but this file is more general + * (it has gprs_* name). Either move these functions elsewhere, split them and + * move a part, or replace the gprs_ prefix by sgsn_. The applies to + * gprs_subscr_init, gsup_read_cb, and gprs_subscr_tx_gsup_message. + */ + +int gprs_subscr_init(struct sgsn_instance *sgi) +{ + const char *addr_str; + + if (!sgi->cfg.gsup_server_addr.sin_addr.s_addr) + return 0; + + addr_str = inet_ntoa(sgi->cfg.gsup_server_addr.sin_addr); + + sgi->gsup_client = gsup_client_create( + addr_str, sgi->cfg.gsup_server_port, + &gsup_read_cb, + &sgi->cfg.oap); + + if (!sgi->gsup_client) + return -1; + + return 1; +} + +static int gsup_read_cb(struct gsup_client *gsupc, struct msgb *msg) +{ + int rc; + + rc = gprs_subscr_rx_gsup_message(msg); + msgb_free(msg); + if (rc < 0) + return -1; + + return rc; +} + +int gprs_subscr_purge(struct gprs_subscr *subscr); + +static struct sgsn_subscriber_data *sgsn_subscriber_data_alloc(void *ctx) +{ + struct sgsn_subscriber_data *sdata; + int idx; + + sdata = talloc_zero(ctx, struct sgsn_subscriber_data); + + sdata->error_cause = SGSN_ERROR_CAUSE_NONE; + + for (idx = 0; idx < ARRAY_SIZE(sdata->auth_triplets); idx++) + sdata->auth_triplets[idx].key_seq = GSM_KEY_SEQ_INVAL; + + INIT_LLIST_HEAD(&sdata->pdp_list); + + return sdata; +} + +struct sgsn_subscriber_pdp_data* sgsn_subscriber_pdp_data_alloc( + struct sgsn_subscriber_data *sdata) +{ + struct sgsn_subscriber_pdp_data* pdata; + + pdata = talloc_zero(sdata, struct sgsn_subscriber_pdp_data); + + llist_add_tail(&pdata->list, &sdata->pdp_list); + + return pdata; +} + +struct gprs_subscr *gprs_subscr_get_by_imsi(const char *imsi) +{ + struct gprs_subscr *gsub; + + if (!imsi || !*imsi) + return NULL; + + llist_for_each_entry(gsub, gprs_subscribers, entry) { + if (!strcmp(gsub->imsi, imsi)) + return gprs_subscr_get(gsub); + } + return NULL; +} + +static struct gprs_subscr *gprs_subscr_alloc(void) +{ + struct gprs_subscr *gsub; + gsub = talloc_zero(tall_bsc_ctx, struct gprs_subscr); + if (!gsub) + return NULL; + llist_add_tail(&gsub->entry, gprs_subscribers); + gsub->use_count = 1; + gsub->tmsi = GSM_RESERVED_TMSI; + return gsub; +} + +struct gprs_subscr *gprs_subscr_get_or_create(const char *imsi) +{ + struct gprs_subscr *gsub; + + gsub = gprs_subscr_get_by_imsi(imsi); + if (!gsub) { + gsub = gprs_subscr_alloc(); + if (!gsub) + return NULL; + osmo_strlcpy(gsub->imsi, imsi, sizeof(gsub->imsi)); + } + + if (!gsub->sgsn_data) + gsub->sgsn_data = sgsn_subscriber_data_alloc(gsub); + return gsub; +} + +void gprs_subscr_cleanup(struct gprs_subscr *subscr) +{ + if (subscr->sgsn_data->mm) { + gprs_subscr_put(subscr->sgsn_data->mm->subscr); + subscr->sgsn_data->mm->subscr = NULL; + subscr->sgsn_data->mm = NULL; + } + + if (subscr->flags & GPRS_SUBSCRIBER_ENABLE_PURGE) { + gprs_subscr_purge(subscr); + subscr->flags &= ~GPRS_SUBSCRIBER_ENABLE_PURGE; + } +} + +void gprs_subscr_cancel(struct gprs_subscr *subscr) +{ + subscr->authorized = 0; + subscr->flags |= GPRS_SUBSCRIBER_CANCELLED; + subscr->flags &= ~GPRS_SUBSCRIBER_ENABLE_PURGE; + + gprs_subscr_update(subscr); + gprs_subscr_cleanup(subscr); +} + +static int gprs_subscr_tx_gsup_message(struct gprs_subscr *subscr, + struct osmo_gsup_message *gsup_msg) +{ + struct msgb *msg = gsup_client_msgb_alloc(); + + if (strlen(gsup_msg->imsi) == 0 && subscr) + osmo_strlcpy(gsup_msg->imsi, subscr->imsi, + sizeof(gsup_msg->imsi)); + gsup_msg->cn_domain = OSMO_GSUP_CN_DOMAIN_PS; + osmo_gsup_encode(msg, gsup_msg); + + LOGGSUBSCRP(LOGL_INFO, subscr, + "Sending GSUP, will send: %s\n", msgb_hexdump(msg)); + + if (!sgsn->gsup_client) { + msgb_free(msg); + return -ENOTSUP; + } + + return gsup_client_send(sgsn->gsup_client, msg); +} + +static int gprs_subscr_tx_gsup_error_reply(struct gprs_subscr *subscr, + struct osmo_gsup_message *gsup_orig, + enum gsm48_gmm_cause cause) +{ + struct osmo_gsup_message gsup_reply = {0}; + + osmo_strlcpy(gsup_reply.imsi, gsup_orig->imsi, + sizeof(gsup_reply.imsi)); + gsup_reply.cause = cause; + gsup_reply.message_type = + OSMO_GSUP_TO_MSGT_ERROR(gsup_orig->message_type); + + return gprs_subscr_tx_gsup_message(subscr, &gsup_reply); +} + +static int gprs_subscr_handle_gsup_auth_res(struct gprs_subscr *subscr, + struct osmo_gsup_message *gsup_msg) +{ + unsigned idx; + struct sgsn_subscriber_data *sdata = subscr->sgsn_data; + + LOGGSUBSCRP(LOGL_INFO, subscr, + "Got SendAuthenticationInfoResult, num_auth_vectors = %zu\n", + gsup_msg->num_auth_vectors); + + if (gsup_msg->num_auth_vectors > 0) { + memset(sdata->auth_triplets, 0, sizeof(sdata->auth_triplets)); + + for (idx = 0; idx < ARRAY_SIZE(sdata->auth_triplets); idx++) + sdata->auth_triplets[idx].key_seq = GSM_KEY_SEQ_INVAL; + } + + for (idx = 0; idx < gsup_msg->num_auth_vectors; idx++) { + size_t key_seq = idx; + LOGGSUBSCRP(LOGL_DEBUG, subscr, + "Adding auth tuple, cksn = %zu\n", key_seq); + if (key_seq >= ARRAY_SIZE(sdata->auth_triplets)) { + LOGGSUBSCRP(LOGL_NOTICE, subscr, + "Skipping auth triplet with invalid cksn %zu\n", + key_seq); + continue; + } + sdata->auth_triplets[key_seq].vec = gsup_msg->auth_vectors[idx]; + sdata->auth_triplets[key_seq].key_seq = key_seq; + } + + sdata->auth_triplets_updated = 1; + sdata->error_cause = SGSN_ERROR_CAUSE_NONE; + + gprs_subscr_update_auth_info(subscr); + + return 0; +} + +static int gprs_subscr_pdp_data_clear(struct gprs_subscr *subscr) +{ + struct sgsn_subscriber_pdp_data *pdp, *pdp2; + int count = 0; + + llist_for_each_entry_safe(pdp, pdp2, &subscr->sgsn_data->pdp_list, list) { + llist_del(&pdp->list); + talloc_free(pdp); + count += 1; + } + + return count; +} + +static struct sgsn_subscriber_pdp_data *gprs_subscr_pdp_data_get_by_id( + struct gprs_subscr *subscr, unsigned context_id) +{ + struct sgsn_subscriber_pdp_data *pdp; + + llist_for_each_entry(pdp, &subscr->sgsn_data->pdp_list, list) { + if (pdp->context_id == context_id) + return pdp; + } + + return NULL; +} + + +static void gprs_subscr_gsup_insert_data(struct gprs_subscr *subscr, + struct osmo_gsup_message *gsup_msg) +{ + struct sgsn_subscriber_data *sdata = subscr->sgsn_data; + unsigned idx; + int rc; + + if (gsup_msg->msisdn_enc) { + if (gsup_msg->msisdn_enc_len > sizeof(sdata->msisdn)) { + LOGP(DGPRS, LOGL_ERROR, "MSISDN too long (%zu)\n", + gsup_msg->msisdn_enc_len); + sdata->msisdn_len = 0; + } else { + memcpy(sdata->msisdn, gsup_msg->msisdn_enc, + gsup_msg->msisdn_enc_len); + sdata->msisdn_len = gsup_msg->msisdn_enc_len; + } + } + + if (gsup_msg->hlr_enc) { + if (gsup_msg->hlr_enc_len > sizeof(sdata->hlr)) { + LOGP(DGPRS, LOGL_ERROR, "HLR-Number too long (%zu)\n", + gsup_msg->hlr_enc_len); + sdata->hlr_len = 0; + } else { + memcpy(sdata->hlr, gsup_msg->hlr_enc, + gsup_msg->hlr_enc_len); + sdata->hlr_len = gsup_msg->hlr_enc_len; + } + } + + if (gsup_msg->pdp_info_compl) { + rc = gprs_subscr_pdp_data_clear(subscr); + if (rc > 0) + LOGP(DGPRS, LOGL_INFO, "Cleared existing PDP info\n"); + } + + for (idx = 0; idx < gsup_msg->num_pdp_infos; idx++) { + 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) { + LOGGSUBSCRP(LOGL_ERROR, subscr, + "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)) { + LOGGSUBSCRP(LOGL_ERROR, subscr, + "QoS info too long (%zu)\n", + pdp_info->qos_enc_len); + continue; + } + + LOGGSUBSCRP(LOGL_INFO, subscr, + "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 = gprs_subscr_pdp_data_get_by_id(subscr, ctx_id); + if (!pdp_data) { + pdp_data = sgsn_subscriber_pdp_data_alloc(subscr->sgsn_data); + pdp_data->context_id = ctx_id; + } + + OSMO_ASSERT(pdp_data != NULL); + pdp_data->pdp_type = pdp_info->pdp_type; + gprs_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; + } +} + +static int gprs_subscr_handle_gsup_upd_loc_res(struct gprs_subscr *subscr, + struct osmo_gsup_message *gsup_msg) +{ + /* 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 */ + gprs_subscr_gsup_insert_data(subscr, gsup_msg); + + subscr->authorized = 1; + subscr->sgsn_data->error_cause = SGSN_ERROR_CAUSE_NONE; + + subscr->flags |= GPRS_SUBSCRIBER_ENABLE_PURGE; + + gprs_subscr_update(subscr); + return 0; +} + +static int gprs_subscr_handle_gsup_dsd_req(struct gprs_subscr *subscr, + struct osmo_gsup_message *gsup_msg) +{ + struct osmo_gsup_message gsup_reply = {0}; + + if (gsup_msg->cn_domain != OSMO_GSUP_CN_DOMAIN_PS) { + LOGGSUBSCRP(LOGL_ERROR, subscr, + "Rx GSUP message %s not supported for CS\n", + osmo_gsup_message_type_name(gsup_msg->message_type)); + gsup_reply.cause = GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL; + gsup_reply.message_type = OSMO_GSUP_MSGT_DELETE_DATA_ERROR; + } else { + gsm0408_gprs_access_cancelled(subscr->sgsn_data->mm, + GMM_CAUSE_GPRS_NOTALLOWED); + gsup_reply.message_type = OSMO_GSUP_MSGT_DELETE_DATA_RESULT; + } + + return gprs_subscr_tx_gsup_message(subscr, &gsup_reply); +} + +static int gprs_subscr_handle_gsup_isd_req(struct gprs_subscr *subscr, + struct osmo_gsup_message *gsup_msg) +{ + struct osmo_gsup_message gsup_reply = {0}; + + gprs_subscr_gsup_insert_data(subscr, gsup_msg); + + subscr->authorized = 1; + subscr->sgsn_data->error_cause = SGSN_ERROR_CAUSE_NONE; + subscr->flags |= GPRS_SUBSCRIBER_ENABLE_PURGE; + gprs_subscr_update(subscr); + + gsup_reply.message_type = OSMO_GSUP_MSGT_INSERT_DATA_RESULT; + return gprs_subscr_tx_gsup_message(subscr, &gsup_reply); +} + +static int check_cause(int cause) +{ + switch (cause) { + case GMM_CAUSE_IMSI_UNKNOWN ... GMM_CAUSE_ILLEGAL_ME: + case GMM_CAUSE_GPRS_NOTALLOWED ... GMM_CAUSE_NO_GPRS_PLMN: + return EACCES; + + case GMM_CAUSE_MSC_TEMP_NOTREACH ... GMM_CAUSE_CONGESTION: + return EHOSTUNREACH; + + case GMM_CAUSE_SEM_INCORR_MSG ... GMM_CAUSE_PROTO_ERR_UNSPEC: + default: + return EINVAL; + } +} + +static int gprs_subscr_handle_gsup_auth_err(struct gprs_subscr *subscr, + struct osmo_gsup_message *gsup_msg) +{ + unsigned idx; + struct sgsn_subscriber_data *sdata = subscr->sgsn_data; + int cause_err; + + cause_err = check_cause(gsup_msg->cause); + + LOGGSUBSCRP(LOGL_DEBUG, subscr, + "Send authentication info has failed with cause %d, " + "handled as: %s\n", + gsup_msg->cause, strerror(cause_err)); + + switch (cause_err) { + case EACCES: + LOGGSUBSCRP(LOGL_NOTICE, subscr, + "GPRS send auth info req failed, access denied, " + "GMM cause = '%s' (%d)\n", + get_value_string(gsm48_gmm_cause_names, gsup_msg->cause), + gsup_msg->cause); + /* Clear auth tuples */ + memset(sdata->auth_triplets, 0, sizeof(sdata->auth_triplets)); + for (idx = 0; idx < ARRAY_SIZE(sdata->auth_triplets); idx++) + sdata->auth_triplets[idx].key_seq = GSM_KEY_SEQ_INVAL; + + subscr->authorized = 0; + sdata->error_cause = gsup_msg->cause; + gprs_subscr_update_auth_info(subscr); + break; + + case EHOSTUNREACH: + LOGGSUBSCRP(LOGL_NOTICE, subscr, + "GPRS send auth info req failed, GMM cause = '%s' (%d)\n", + get_value_string(gsm48_gmm_cause_names, gsup_msg->cause), + gsup_msg->cause); + + sdata->error_cause = gsup_msg->cause; + gprs_subscr_update_auth_info(subscr); + break; + + default: + case EINVAL: + LOGGSUBSCRP(LOGL_ERROR, subscr, + "GSUP protocol remote error, GMM cause = '%s' (%d)\n", + get_value_string(gsm48_gmm_cause_names, gsup_msg->cause), + gsup_msg->cause); + break; + } + + return -gsup_msg->cause; +} + +static int gprs_subscr_handle_gsup_upd_loc_err(struct gprs_subscr *subscr, + struct osmo_gsup_message *gsup_msg) +{ + int cause_err; + + cause_err = check_cause(gsup_msg->cause); + + LOGGSUBSCRP(LOGL_DEBUG, subscr, + "Update location has failed with cause %d, handled as: %s\n", + gsup_msg->cause, strerror(cause_err)); + + switch (cause_err) { + case EACCES: + LOGGSUBSCRP(LOGL_NOTICE, subscr, + "GPRS update location failed, access denied, " + "GMM cause = '%s' (%d)\n", + get_value_string(gsm48_gmm_cause_names, gsup_msg->cause), + gsup_msg->cause); + + subscr->authorized = 0; + subscr->sgsn_data->error_cause = gsup_msg->cause; + gprs_subscr_update_auth_info(subscr); + break; + + case EHOSTUNREACH: + LOGGSUBSCRP(LOGL_NOTICE, subscr, + "GPRS update location failed, GMM cause = '%s' (%d)\n", + get_value_string(gsm48_gmm_cause_names, gsup_msg->cause), + gsup_msg->cause); + + subscr->sgsn_data->error_cause = gsup_msg->cause; + gprs_subscr_update_auth_info(subscr); + break; + + default: + case EINVAL: + LOGGSUBSCRP(LOGL_ERROR, subscr, + "GSUP protocol remote error, GMM cause = '%s' (%d)\n", + get_value_string(gsm48_gmm_cause_names, gsup_msg->cause), + gsup_msg->cause); + break; + } + + return -gsup_msg->cause; +} + +static int gprs_subscr_handle_gsup_purge_no_subscr( + 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; +} + +static int gprs_subscr_handle_gsup_purge_res(struct gprs_subscr *subscr, + struct osmo_gsup_message *gsup_msg) +{ + LOGGSUBSCRP(LOGL_INFO, subscr, "Completing purge MS\n"); + + /* Force silent cancellation */ + subscr->sgsn_data->error_cause = SGSN_ERROR_CAUSE_NONE; + gprs_subscr_cancel(subscr); + + return 0; +} + +static int gprs_subscr_handle_gsup_purge_err(struct gprs_subscr *subscr, + struct osmo_gsup_message *gsup_msg) +{ + LOGGSUBSCRP(LOGL_NOTICE, subscr, + "Purge MS has failed with cause '%s' (%d)\n", + get_value_string(gsm48_gmm_cause_names, gsup_msg->cause), + gsup_msg->cause); + + /* In GSM 09.02, 19.1.4.4, the text and the SDL diagram imply that + * the subscriber data is not removed if the request has failed. On the + * other hand, keeping the subscriber data in either error case + * (subscriber unknown, syntactical message error, connection error) + * doesn't seem to give any advantage, since the data will be restored + * on the next Attach Request anyway. + * This approach ensures, that the subscriber record will not stick if + * an error happens. + */ + + /* TODO: Check whether this behaviour is acceptable and either just + * remove this TODO-notice or change the implementation to not delete + * the subscriber data (eventually resetting the ENABLE_PURGE flag and + * restarting the expiry timer based on the cause). + * + * Subscriber Unknown: cancel subscr + * Temporary network problems: do nothing (handled by timer based retry) + * Message problems (syntax, nyi, ...): cancel subscr (retry won't help) + */ + + gprs_subscr_handle_gsup_purge_res(subscr, gsup_msg); + + return -gsup_msg->cause; +} + +static int gprs_subscr_handle_loc_cancel_req(struct gprs_subscr *subscr, + 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; + + LOGGSUBSCRP(LOGL_INFO, subscr, "Cancelling MS subscriber (%s)\n", + is_update_procedure ? + "update procedure" : "subscription withdraw"); + + gsup_reply.message_type = OSMO_GSUP_MSGT_LOCATION_CANCEL_RESULT; + gprs_subscr_tx_gsup_message(subscr, &gsup_reply); + + if (is_update_procedure) + subscr->sgsn_data->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. + */ + subscr->sgsn_data->error_cause = GMM_CAUSE_IMPL_DETACHED; + + gprs_subscr_cancel(subscr); + + return 0; +} + +static int gprs_subscr_handle_unknown_imsi(struct osmo_gsup_message *gsup_msg) +{ + if (OSMO_GSUP_IS_MSGT_REQUEST(gsup_msg->message_type)) { + gprs_subscr_tx_gsup_error_reply(NULL, gsup_msg, + GMM_CAUSE_IMSI_UNKNOWN); + LOGP(DGPRS, 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(DGPRS, 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(DGPRS, 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; +} + +int gprs_subscr_rx_gsup_message(struct msgb *msg) +{ + uint8_t *data = msgb_l2(msg); + size_t data_len = msgb_l2len(msg); + int rc = 0; + + struct osmo_gsup_message gsup_msg = {0}; + struct gprs_subscr *subscr; + + rc = osmo_gsup_decode(data, data_len, &gsup_msg); + if (rc < 0) { + LOGP(DGPRS, LOGL_ERROR, + "decoding GSUP message fails with error '%s' (%d)\n", + get_value_string(gsm48_gmm_cause_names, -rc), -rc); + return rc; + } + + if (!gsup_msg.imsi[0]) { + LOGP(DGPRS, LOGL_ERROR, "Missing IMSI in GSUP message\n"); + + if (OSMO_GSUP_IS_MSGT_REQUEST(gsup_msg.message_type)) + gprs_subscr_tx_gsup_error_reply(NULL, &gsup_msg, + GMM_CAUSE_INV_MAND_INFO); + return -GMM_CAUSE_INV_MAND_INFO; + } + + if (!gsup_msg.cause && OSMO_GSUP_IS_MSGT_ERROR(gsup_msg.message_type)) + gsup_msg.cause = GMM_CAUSE_NET_FAIL; + + subscr = gprs_subscr_get_by_imsi(gsup_msg.imsi); + + if (!subscr) { + switch (gsup_msg.message_type) { + case OSMO_GSUP_MSGT_PURGE_MS_RESULT: + case OSMO_GSUP_MSGT_PURGE_MS_ERROR: + return gprs_subscr_handle_gsup_purge_no_subscr(&gsup_msg); + default: + return gprs_subscr_handle_unknown_imsi(&gsup_msg); + } + } + + LOGGSUBSCRP(LOGL_INFO, subscr, + "Received GSUP message %s\n", + osmo_gsup_message_type_name(gsup_msg.message_type)); + + switch (gsup_msg.message_type) { + case OSMO_GSUP_MSGT_LOCATION_CANCEL_REQUEST: + rc = gprs_subscr_handle_loc_cancel_req(subscr, &gsup_msg); + break; + + case OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT: + rc = gprs_subscr_handle_gsup_auth_res(subscr, &gsup_msg); + break; + + case OSMO_GSUP_MSGT_SEND_AUTH_INFO_ERROR: + rc = gprs_subscr_handle_gsup_auth_err(subscr, &gsup_msg); + break; + + case OSMO_GSUP_MSGT_UPDATE_LOCATION_RESULT: + rc = gprs_subscr_handle_gsup_upd_loc_res(subscr, &gsup_msg); + break; + + case OSMO_GSUP_MSGT_UPDATE_LOCATION_ERROR: + rc = gprs_subscr_handle_gsup_upd_loc_err(subscr, &gsup_msg); + break; + + case OSMO_GSUP_MSGT_PURGE_MS_ERROR: + rc = gprs_subscr_handle_gsup_purge_err(subscr, &gsup_msg); + break; + + case OSMO_GSUP_MSGT_PURGE_MS_RESULT: + rc = gprs_subscr_handle_gsup_purge_res(subscr, &gsup_msg); + break; + + case OSMO_GSUP_MSGT_INSERT_DATA_REQUEST: + rc = gprs_subscr_handle_gsup_isd_req(subscr, &gsup_msg); + break; + + case OSMO_GSUP_MSGT_DELETE_DATA_REQUEST: + rc = gprs_subscr_handle_gsup_dsd_req(subscr, &gsup_msg); + break; + + default: + LOGGSUBSCRP(LOGL_ERROR, subscr, + "Rx GSUP message %s not valid at SGSN\n", + osmo_gsup_message_type_name(gsup_msg.message_type)); + if (OSMO_GSUP_IS_MSGT_REQUEST(gsup_msg.message_type)) + gprs_subscr_tx_gsup_error_reply( + subscr, &gsup_msg, GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL); + rc = -GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL; + break; + }; + + gprs_subscr_put(subscr); + + return rc; +} + +int gprs_subscr_purge(struct gprs_subscr *subscr) +{ + struct sgsn_subscriber_data *sdata = subscr->sgsn_data; + struct osmo_gsup_message gsup_msg = {0}; + + LOGGSUBSCRP(LOGL_INFO, subscr, "purging MS subscriber\n"); + + gsup_msg.message_type = OSMO_GSUP_MSGT_PURGE_MS_REQUEST; + + /* Provide the HLR number in case it is known */ + gsup_msg.hlr_enc_len = sdata->hlr_len; + gsup_msg.hlr_enc = sdata->hlr; + + return gprs_subscr_tx_gsup_message(subscr, &gsup_msg); +} + +static int gprs_subscr_query_auth_info(struct gprs_subscr *subscr, + const uint8_t *auts, + const uint8_t *auts_rand) +{ + struct osmo_gsup_message gsup_msg = {0}; + + /* Make sure we have a complete resync or clearly no resync. */ + OSMO_ASSERT((auts != NULL) == (auts_rand != NULL)); + + LOGGSUBSCRP(LOGL_INFO, subscr, "requesting auth info%s\n", + auts ? " with AUTS (UMTS Resynch)" : ""); + + gsup_msg.message_type = OSMO_GSUP_MSGT_SEND_AUTH_INFO_REQUEST; + gsup_msg.auts = auts; + gsup_msg.rand = auts_rand; + return gprs_subscr_tx_gsup_message(subscr, &gsup_msg); +} + +int gprs_subscr_location_update(struct gprs_subscr *subscr) +{ + struct osmo_gsup_message gsup_msg = {0}; + + LOGGSUBSCRP(LOGL_INFO, subscr, + "subscriber data is not available\n"); + + gsup_msg.message_type = OSMO_GSUP_MSGT_UPDATE_LOCATION_REQUEST; + return gprs_subscr_tx_gsup_message(subscr, &gsup_msg); +} + +void gprs_subscr_update(struct gprs_subscr *subscr) +{ + LOGGSUBSCRP(LOGL_DEBUG, subscr, "Updating subscriber data\n"); + + subscr->flags &= ~GPRS_SUBSCRIBER_UPDATE_LOCATION_PENDING; + subscr->flags &= ~GPRS_SUBSCRIBER_FIRST_CONTACT; + + if (subscr->sgsn_data->mm) + sgsn_update_subscriber_data(subscr->sgsn_data->mm); +} + +void gprs_subscr_update_auth_info(struct gprs_subscr *subscr) +{ + LOGGSUBSCRP(LOGL_DEBUG, subscr, + "Updating subscriber authentication info\n"); + + subscr->flags &= ~GPRS_SUBSCRIBER_UPDATE_AUTH_INFO_PENDING; + subscr->flags &= ~GPRS_SUBSCRIBER_FIRST_CONTACT; + + if (subscr->sgsn_data->mm) + sgsn_update_subscriber_data(subscr->sgsn_data->mm); +} + +struct gprs_subscr *gprs_subscr_get_or_create_by_mmctx(struct sgsn_mm_ctx *mmctx) +{ + struct gprs_subscr *subscr = NULL; + + if (mmctx->subscr) + return gprs_subscr_get(mmctx->subscr); + + if (mmctx->imsi[0]) + subscr = gprs_subscr_get_by_imsi(mmctx->imsi); + + if (!subscr) { + subscr = gprs_subscr_get_or_create(mmctx->imsi); + subscr->flags |= GPRS_SUBSCRIBER_FIRST_CONTACT; + subscr->flags &= ~GPRS_SUBSCRIBER_ENABLE_PURGE; + } + + osmo_strlcpy(subscr->imei, mmctx->imei, sizeof(subscr->imei)); + + if (subscr->lac != mmctx->ra.lac) + subscr->lac = mmctx->ra.lac; + + subscr->sgsn_data->mm = mmctx; + mmctx->subscr = gprs_subscr_get(subscr); + + return subscr; +} + +int gprs_subscr_request_update_location(struct sgsn_mm_ctx *mmctx) +{ + struct gprs_subscr *subscr = NULL; + int rc; + + LOGMMCTXP(LOGL_DEBUG, mmctx, "Requesting subscriber data update\n"); + + subscr = gprs_subscr_get_or_create_by_mmctx(mmctx); + + subscr->flags |= GPRS_SUBSCRIBER_UPDATE_LOCATION_PENDING; + + rc = gprs_subscr_location_update(subscr); + gprs_subscr_put(subscr); + return rc; +} + +/*! \brief Send Update Auth Info request via GSUP, with or without resync. + * \param[in] mmctx MM context to request authentication tuples for. + * \param[in] auts 14 octet AUTS token for UMTS resync, or NULL. + * \param[in] auts_rand 16 octet Random token for UMTS resync, or NULL. + * In case of normal Authentication Info request, both \a auts and \a auts_rand + * must be NULL. For resync, both must be non-NULL. + */ +int gprs_subscr_request_auth_info(struct sgsn_mm_ctx *mmctx, + const uint8_t *auts, + const uint8_t *auts_rand) +{ + struct gprs_subscr *subscr = NULL; + int rc; + + LOGMMCTXP(LOGL_DEBUG, mmctx, "Requesting subscriber authentication info\n"); + + subscr = gprs_subscr_get_or_create_by_mmctx(mmctx); + + subscr->flags |= GPRS_SUBSCRIBER_UPDATE_AUTH_INFO_PENDING; + + rc = gprs_subscr_query_auth_info(subscr, auts, auts_rand); + gprs_subscr_put(subscr); + return rc; +} + +static void gprs_subscr_free(struct gprs_subscr *gsub) +{ + llist_del(&gsub->entry); + talloc_free(gsub); +} + +struct gprs_subscr *_gprs_subscr_get(struct gprs_subscr *gsub, + const char *file, int line) +{ + OSMO_ASSERT(gsub->use_count < INT_MAX); + gsub->use_count++; + LOGPSRC(DREF, LOGL_DEBUG, file, line, + "subscr %s usage increases to: %d\n", + gsub->imsi, gsub->use_count); + return gsub; +} + +struct gprs_subscr *_gprs_subscr_put(struct gprs_subscr *gsub, + const char *file, int line) +{ + gsub->use_count--; + LOGPSRC(DREF, gsub->use_count >= 0? LOGL_DEBUG : LOGL_ERROR, + file, line, + "subscr %s usage decreases to: %d%s\n", + gsub->imsi, gsub->use_count, + gsub->keep_in_ram? ", keep-in-ram flag is set" : ""); + if (gsub->use_count > 0) + return gsub; + if (gsub->keep_in_ram) + return gsub; + gprs_subscr_free(gsub); + return NULL; +} |