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-rw-r--r--src/gprs/gprs_subscriber.c921
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;
+}