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osmo-bsc/src/gprs/gprs_subscriber.c

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/* 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;
}
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