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osmo-msc/src/libvlr/vlr.c

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/* 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/core/utils.h>
#include <osmocom/gsm/protocol/gsm_04_08_gprs.h>
#include <osmocom/gsm/gsup.h>
#include <osmocom/gsm/apn.h>
#include <osmocom/gsm/gsm48.h>
#include <osmocom/msc/gsm_subscriber.h>
#include <osmocom/msc/gsup_client.h>
#include <osmocom/msc/vlr.h>
#include <osmocom/msc/debug.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <limits.h>
#include <errno.h>
#include "vlr_core.h"
#include "vlr_auth_fsm.h"
#include "vlr_lu_fsm.h"
#include "vlr_access_req_fsm.h"
#define SGSN_SUBSCR_MAX_RETRIES 3
#define SGSN_SUBSCR_RETRY_INTERVAL 10
/***********************************************************************
* Convenience functions
***********************************************************************/
const struct value_string vlr_ciph_names[] = {
OSMO_VALUE_STRING(VLR_CIPH_NONE),
OSMO_VALUE_STRING(VLR_CIPH_A5_1),
OSMO_VALUE_STRING(VLR_CIPH_A5_2),
OSMO_VALUE_STRING(VLR_CIPH_A5_3),
{ 0, NULL }
};
uint32_t vlr_timer(struct vlr_instance *vlr, uint32_t timer)
{
uint32_t tidx = 0xffffffff;
switch (timer) {
case 3270:
tidx = VLR_T_3270;
break;
case 3260:
tidx = VLR_T_3260;
break;
case 3250:
tidx = VLR_T_3250;
break;
}
OSMO_ASSERT(tidx < sizeof(vlr->cfg.timer));
return vlr->cfg.timer[tidx];
}
struct vlr_subscr *_vlr_subscr_find_by_imsi(struct vlr_instance *vlr,
const char *imsi,
const char *file, int line)
{
struct vlr_subscr *vsub;
if (!imsi || !*imsi)
return NULL;
llist_for_each_entry(vsub, &vlr->subscribers, list) {
if (vlr_subscr_matches_imsi(vsub, imsi))
return _vlr_subscr_get(vsub, file, line);
}
return NULL;
}
struct vlr_subscr *_vlr_subscr_find_by_tmsi(struct vlr_instance *vlr,
uint32_t tmsi,
const char *file, int line)
{
struct vlr_subscr *vsub;
if (tmsi == GSM_RESERVED_TMSI)
return NULL;
llist_for_each_entry(vsub, &vlr->subscribers, list) {
if (vlr_subscr_matches_tmsi(vsub, tmsi))
return _vlr_subscr_get(vsub, file, line);
}
return NULL;
}
struct vlr_subscr *_vlr_subscr_find_by_msisdn(struct vlr_instance *vlr,
const char *msisdn,
const char *file, int line)
{
struct vlr_subscr *vsub;
if (!msisdn || !*msisdn)
return NULL;
llist_for_each_entry(vsub, &vlr->subscribers, list) {
if (vlr_subscr_matches_msisdn(vsub, msisdn))
return _vlr_subscr_get(vsub, file, line);
}
return NULL;
}
/* Transmit GSUP message to HLR */
static int vlr_tx_gsup_message(struct vlr_instance *vlr,
struct osmo_gsup_message *gsup_msg)
{
struct msgb *msg = gsup_client_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, "GSUP tx: %s\n",
osmo_hexdump_nospc(msg->data, msg->len));
return 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_subscr *vsub,
struct osmo_gsup_message *gsup_msg)
{
struct vlr_instance *vlr = vsub->vlr;
if (strlen(gsup_msg->imsi) == 0)
osmo_strlcpy(gsup_msg->imsi, vsub->imsi, sizeof(gsup_msg->imsi));
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};
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 vlr_tx_gsup_message(vlr, &gsup_reply);
}
struct vlr_subscr *_vlr_subscr_get(struct vlr_subscr *sub, const char *file, int line)
{
if (!sub)
return NULL;
OSMO_ASSERT(sub->use_count < INT_MAX);
sub->use_count++;
LOGPSRC(DREF, LOGL_DEBUG, file, line,
"VLR subscr %s usage increases to: %d\n",
vlr_subscr_name(sub), sub->use_count);
return sub;
}
struct vlr_subscr *_vlr_subscr_put(struct vlr_subscr *sub, const char *file, int line)
{
if (!sub)
return NULL;
sub->use_count--;
LOGPSRC(DREF, sub->use_count >= 0? LOGL_DEBUG : LOGL_ERROR,
file, line,
"VLR subscr %s usage decreases to: %d\n",
vlr_subscr_name(sub), sub->use_count);
if (sub->use_count <= 0)
vlr_subscr_free(sub);
return NULL;
}
/* Allocate a new subscriber and insert it into list */
static struct vlr_subscr *_vlr_subscr_alloc(struct vlr_instance *vlr)
{
struct vlr_subscr *vsub;
int i;
vsub = talloc_zero(vlr, struct vlr_subscr);
vsub->vlr = vlr;
vsub->tmsi = GSM_RESERVED_TMSI;
vsub->tmsi_new = GSM_RESERVED_TMSI;
for (i = 0; i < ARRAY_SIZE(vsub->auth_tuples); i++)
vsub->auth_tuples[i].key_seq = GSM_KEY_SEQ_INVAL;
INIT_LLIST_HEAD(&vsub->cs.requests);
INIT_LLIST_HEAD(&vsub->ps.pdp_list);
llist_add_tail(&vsub->list, &vlr->subscribers);
return vsub;
}
struct vlr_subscr *vlr_subscr_alloc(struct vlr_instance *vlr)
{
return vlr_subscr_get(_vlr_subscr_alloc(vlr));
}
/* Send a GSUP Purge MS request.
* TODO: this should be sent to the *previous* VLR when this VLR is "taking"
* this subscriber, not to the HLR? */
int vlr_subscr_purge(struct vlr_subscr *vsub)
{
struct osmo_gsup_message gsup_msg = {0};
gsup_msg.message_type = OSMO_GSUP_MSGT_PURGE_MS_REQUEST;
/* provide HLR number in case we know it */
gsup_msg.hlr_enc_len = vsub->hlr.len;
gsup_msg.hlr_enc = vsub->hlr.buf;
return vlr_subscr_tx_gsup_message(vsub, &gsup_msg);
}
void vlr_subscr_cancel(struct vlr_subscr *vsub, enum gsm48_gmm_cause cause)
{
if (!vsub)
return;
if (vsub->lu_fsm) {
if (vsub->lu_fsm->state == VLR_ULA_S_WAIT_HLR_UPD)
osmo_fsm_inst_dispatch(vsub->lu_fsm,
VLR_ULA_E_HLR_LU_RES,
(void*)&cause);
else
osmo_fsm_inst_term(vsub->lu_fsm, OSMO_FSM_TERM_ERROR,
0);
}
if (vsub->proc_arq_fsm)
osmo_fsm_inst_term(vsub->proc_arq_fsm, OSMO_FSM_TERM_ERROR, 0);
}
/* Call vlr_subscr_cancel(), then completely drop the entry from the VLR */
void vlr_subscr_free(struct vlr_subscr *vsub)
{
llist_del(&vsub->list);
DEBUGP(DREF, "freeing VLR subscr %s\n", vlr_subscr_name(vsub));
talloc_free(vsub);
}
/* Generate a new TMSI and store in vsub->tmsi_new.
* Search all known subscribers to ensure that the TMSI is unique. */
int vlr_subscr_alloc_tmsi(struct vlr_subscr *vsub)
{
struct vlr_instance *vlr = vsub->vlr;
uint32_t tmsi;
int tried, rc;
for (tried = 0; tried < 100; tried++) {
rc = osmo_get_rand_id((uint8_t *) &tmsi, sizeof(tmsi));
if (rc < 0) {
LOGP(DDB, LOGL_ERROR, "osmo_get_rand_id() failed: %s\n", strerror(-rc));
return rc;
}
/* throw the dice again, if the TSMI doesn't fit */
if (tmsi == GSM_RESERVED_TMSI)
continue;
/* Section 2.4 of 23.003: MSC has two MSB 00/01/10, SGSN 11 */
if (vlr->cfg.is_ps) {
/* SGSN */
tmsi |= 0xC000000;
} else {
/* MSC */
if ((tmsi & 0xC0000000) == 0xC0000000)
tmsi &= ~0xC0000000;
}
/* If this TMSI is already in use, try another one. */
if (vlr_subscr_find_by_tmsi(vlr, tmsi))
continue;
vsub->tmsi_new = tmsi;
return 0;
}
LOGP(DVLR, LOGL_ERROR, "subscr %s: unable to generate valid TMSI"
" after %d tries\n", vlr_subscr_name(vsub), tried);
return -1;
}
/* Find subscriber by IMSI, or create new subscriber if not found.
* \param[in] vlr VLR instace.
* \param[in] imsi IMSI string.
* \param[out] created if non-NULL, returns whether a new entry was created. */
struct vlr_subscr *_vlr_subscr_find_or_create_by_imsi(struct vlr_instance *vlr,
const char *imsi,
bool *created,
const char *file,
int line)
{
struct vlr_subscr *vsub;
vsub = _vlr_subscr_find_by_imsi(vlr, imsi, file, line);
if (vsub) {
if (created)
*created = false;
return vsub;
}
vsub = _vlr_subscr_get(_vlr_subscr_alloc(vlr), file, line);
if (!vsub)
return NULL;
vlr_subscr_set_imsi(vsub, imsi);
LOGP(DVLR, LOGL_INFO, "New subscr, IMSI: %s\n", vsub->imsi);
if (created)
*created = true;
return vsub;
}
/* Find subscriber by TMSI, or create new subscriber if not found.
* \param[in] vlr VLR instace.
* \param[in] tmsi TMSI.
* \param[out] created if non-NULL, returns whether a new entry was created. */
struct vlr_subscr *_vlr_subscr_find_or_create_by_tmsi(struct vlr_instance *vlr,
uint32_t tmsi,
bool *created,
const char *file,
int line)
{
struct vlr_subscr *vsub;
vsub = _vlr_subscr_find_by_tmsi(vlr, tmsi, file, line);
if (vsub) {
if (created)
*created = false;
return vsub;
}
vsub = _vlr_subscr_get(_vlr_subscr_alloc(vlr), file, line);
if (!vsub)
return NULL;
vsub->tmsi = tmsi;
LOGP(DVLR, LOGL_INFO, "New subscr, TMSI: 0x%08x\n", vsub->tmsi);
if (created)
*created = true;
return vsub;
}
void vlr_subscr_set_imsi(struct vlr_subscr *vsub, const char *imsi)
{
if (!vsub)
return;
osmo_strlcpy(vsub->imsi, imsi, sizeof(vsub->imsi));
vsub->id = atoll(vsub->imsi);
DEBUGP(DVLR, "set IMSI on subscriber; IMSI=%s id=%llu\n",
vsub->imsi, vsub->id);
}
void vlr_subscr_set_imei(struct vlr_subscr *vsub, const char *imei)
{
if (!vsub)
return;
osmo_strlcpy(vsub->imei, imei, sizeof(vsub->imei));
DEBUGP(DVLR, "set IMEI on subscriber; IMSI=%s IMEI=%s\n",
vsub->imsi, vsub->imei);
}
void vlr_subscr_set_imeisv(struct vlr_subscr *vsub, const char *imeisv)
{
if (!vsub)
return;
osmo_strlcpy(vsub->imeisv, imeisv, sizeof(vsub->imeisv));
DEBUGP(DVLR, "set IMEISV on subscriber; IMSI=%s IMEISV=%s\n",
vsub->imsi, vsub->imeisv);
}
/* Safely copy the given MSISDN string to vsub->msisdn */
void vlr_subscr_set_msisdn(struct vlr_subscr *vsub, const char *msisdn)
{
if (!vsub)
return;
osmo_strlcpy(vsub->msisdn, msisdn, sizeof(vsub->msisdn));
DEBUGP(DVLR, "set MSISDN on subscriber; IMSI=%s MSISDN=%s\n",
vsub->imsi, vsub->msisdn);
}
bool vlr_subscr_matches_imsi(struct vlr_subscr *vsub, const char *imsi)
{
return vsub && imsi && vsub->imsi[0] && !strcmp(vsub->imsi, imsi);
}
bool vlr_subscr_matches_tmsi(struct vlr_subscr *vsub, uint32_t tmsi)
{
return vsub && tmsi != GSM_RESERVED_TMSI
&& (vsub->tmsi == tmsi || vsub->tmsi_new == tmsi);
}
bool vlr_subscr_matches_msisdn(struct vlr_subscr *vsub, const char *msisdn)
{
return vsub && msisdn && vsub->msisdn[0]
&& !strcmp(vsub->msisdn, msisdn);
}
bool vlr_subscr_matches_imei(struct vlr_subscr *vsub, const char *imei)
{
return vsub && imei && vsub->imei[0]
&& !strcmp(vsub->imei, imei);
}
/* Send updated subscriber information to HLR */
int vlr_subscr_changed(struct vlr_subscr *vsub)
{
/* FIXME */
LOGP(DVLR, LOGL_ERROR, "Not implemented: %s\n", __func__);
return 0;
}
/***********************************************************************
* PDP context data
***********************************************************************/
#define GSM_APN_LENGTH 102
/* see GSM 09.02, 17.7.1, PDP-Context and GPRSSubscriptionData */
/* see GSM 09.02, B.1, gprsSubscriptionData */
struct sgsn_subscriber_pdp_data {
struct llist_head list;
unsigned int context_id;
uint16_t pdp_type;
char apn_str[GSM_APN_LENGTH];
uint8_t qos_subscribed[20];
size_t qos_subscribed_len;
};
struct sgsn_subscriber_pdp_data *
vlr_subscr_pdp_data_alloc(struct vlr_subscr *vsub)
{
struct sgsn_subscriber_pdp_data* pdata;
pdata = talloc_zero(vsub, struct sgsn_subscriber_pdp_data);
llist_add_tail(&pdata->list, &vsub->ps.pdp_list);
return pdata;
}
static int vlr_subscr_pdp_data_clear(struct vlr_subscr *vsub)
{
struct sgsn_subscriber_pdp_data *pdp, *pdp2;
int count = 0;
llist_for_each_entry_safe(pdp, pdp2, &vsub->ps.pdp_list, list) {
llist_del(&pdp->list);
talloc_free(pdp);
count += 1;
}
return count;
}
static struct sgsn_subscriber_pdp_data *
vlr_subscr_pdp_data_get_by_id(struct vlr_subscr *vsub, unsigned context_id)
{
struct sgsn_subscriber_pdp_data *pdp;
llist_for_each_entry(pdp, &vsub->ps.pdp_list, list) {
if (pdp->context_id == context_id)
return pdp;
}
return NULL;
}
/***********************************************************************
* Actual Implementation
***********************************************************************/
static int vlr_rx_gsup_unknown_imsi(struct vlr_instance *vlr,
struct osmo_gsup_message *gsup_msg)
{
if (OSMO_GSUP_IS_MSGT_REQUEST(gsup_msg->message_type)) {
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_subscr_req_lu(struct vlr_subscr *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_subscr_req_sai(struct vlr_subscr *vsub,
const uint8_t *auts, const uint8_t *auts_rand)
{
struct osmo_gsup_message gsup_msg = {0};
gsup_msg.message_type = OSMO_GSUP_MSGT_SEND_AUTH_INFO_REQUEST;
gsup_msg.auts = auts;
gsup_msg.rand = auts_rand;
return vlr_subscr_tx_gsup_message(vsub, &gsup_msg);
}
/* Tell HLR that authentication failure occurred */
int vlr_subscr_tx_auth_fail_rep(struct vlr_subscr *vsub)
{
struct osmo_gsup_message gsup_msg = {0};
gsup_msg.message_type = OSMO_GSUP_MSGT_AUTH_FAIL_REPORT;
osmo_strlcpy(gsup_msg.imsi, vsub->imsi, sizeof(gsup_msg.imsi));
return vlr_tx_gsup_message(vsub->vlr, &gsup_msg);
}
/* Update the subscriber with GSUP-received auth tuples */
void vlr_subscr_update_tuples(struct vlr_subscr *vsub,
const struct osmo_gsup_message *gsup)
{
unsigned int i;
unsigned int got_tuples;
if (gsup->num_auth_vectors) {
memset(&vsub->auth_tuples, 0, sizeof(vsub->auth_tuples));
for (i = 0; i < ARRAY_SIZE(vsub->auth_tuples); i++)
vsub->auth_tuples[i].key_seq = GSM_KEY_SEQ_INVAL;
}
got_tuples = 0;
for (i = 0; i < gsup->num_auth_vectors; i++) {
size_t key_seq = i;
if (key_seq >= ARRAY_SIZE(vsub->auth_tuples)) {
LOGVSUBP(LOGL_NOTICE, vsub,
"Skipping auth tuple wih invalid cksn %zu\n",
key_seq);
continue;
}
vsub->auth_tuples[i].vec = gsup->auth_vectors[i];
vsub->auth_tuples[i].key_seq = key_seq;
got_tuples ++;
}
LOGVSUBP(LOGL_DEBUG, vsub, "Received %u auth tuples\n", got_tuples);
if (!got_tuples) {
/* FIXME what now? */
// vlr_subscr_cancel(vsub, GMM_CAUSE_GSM_AUTH_UNACCEPT); ?
}
/* New tuples means last_tuple becomes invalid */
vsub->last_tuple = NULL;
}
/* Handle SendAuthInfo Result/Error from HLR */
static int vlr_subscr_handle_sai_res(struct vlr_subscr *vsub,
const struct osmo_gsup_message *gsup)
{
struct osmo_fsm_inst *auth_fi = vsub->auth_fsm;
void *data = (void *) gsup;
switch (gsup->message_type) {
case OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT:
osmo_fsm_inst_dispatch(auth_fi, VLR_AUTH_E_HLR_SAI_ACK, data);
break;
case OSMO_GSUP_MSGT_SEND_AUTH_INFO_ERROR:
osmo_fsm_inst_dispatch(auth_fi, VLR_AUTH_E_HLR_SAI_NACK, data);
break;
default:
return -1;
}
return 0;
}
static int decode_bcd_number_safe(char *output, int output_len,
const uint8_t *bcd_lv, int input_len,
int h_len)
{
uint8_t len;
OSMO_ASSERT(output_len >= 1);
*output = '\0';
if (input_len < 1)
return -EIO;
len = bcd_lv[0];
if (input_len < len)
return -EIO;
return gsm48_decode_bcd_number(output, output_len, bcd_lv, h_len);
}
static void vlr_subscr_gsup_insert_data(struct vlr_subscr *vsub,
const struct osmo_gsup_message *gsup_msg)
{
unsigned idx;
int rc;
if (gsup_msg->msisdn_enc) {
decode_bcd_number_safe(vsub->msisdn, sizeof(vsub->msisdn),
gsup_msg->msisdn_enc,
gsup_msg->msisdn_enc_len, 0);
LOGP(DVLR, LOGL_DEBUG, "IMSI:%s has MSISDN:%s\n",
vsub->imsi, vsub->msisdn);
}
if (gsup_msg->hlr_enc) {
if (gsup_msg->hlr_enc_len > sizeof(vsub->hlr.buf)) {
LOGP(DVLR, LOGL_ERROR, "HLR-Number too long (%zu)\n",
gsup_msg->hlr_enc_len);
vsub->hlr.len = 0;
} else {
memcpy(vsub->hlr.buf, gsup_msg->hlr_enc,
gsup_msg->hlr_enc_len);
vsub->hlr.len = gsup_msg->hlr_enc_len;
}
}
if (gsup_msg->pdp_info_compl) {
rc = vlr_subscr_pdp_data_clear(vsub);
if (rc > 0)
LOGP(DVLR, LOGL_INFO, "Cleared existing PDP info\n");
}
for (idx = 0; idx < gsup_msg->num_pdp_infos; idx++) {
const struct osmo_gsup_pdp_info *pdp_info = &gsup_msg->pdp_infos[idx];
size_t ctx_id = pdp_info->context_id;
struct sgsn_subscriber_pdp_data *pdp_data;
if (pdp_info->apn_enc_len >= sizeof(pdp_data->apn_str)-1) {
LOGVSUBP(LOGL_ERROR, vsub,
"APN too long, context id = %zu, APN = %s\n",
ctx_id, osmo_hexdump(pdp_info->apn_enc,
pdp_info->apn_enc_len));
continue;
}
if (pdp_info->qos_enc_len > sizeof(pdp_data->qos_subscribed)) {
LOGVSUBP(LOGL_ERROR, vsub,
"QoS info too long (%zu)\n",
pdp_info->qos_enc_len);
continue;
}
LOGVSUBP(LOGL_INFO, vsub,
"Will set PDP info, context id = %zu, APN = %s\n",
ctx_id, osmo_hexdump(pdp_info->apn_enc, pdp_info->apn_enc_len));
/* Set PDP info [ctx_id] */
pdp_data = vlr_subscr_pdp_data_get_by_id(vsub, ctx_id);
if (!pdp_data) {
pdp_data = vlr_subscr_pdp_data_alloc(vsub);
pdp_data->context_id = ctx_id;
}
OSMO_ASSERT(pdp_data != NULL);
pdp_data->pdp_type = pdp_info->pdp_type;
osmo_apn_to_str(pdp_data->apn_str,
pdp_info->apn_enc, pdp_info->apn_enc_len);
memcpy(pdp_data->qos_subscribed, pdp_info->qos_enc, pdp_info->qos_enc_len);
pdp_data->qos_subscribed_len = pdp_info->qos_enc_len;
}
}
/* Handle InsertSubscrData Result from HLR */
static int vlr_subscr_handle_isd_req(struct vlr_subscr *vsub,
const struct osmo_gsup_message *gsup)
{
struct osmo_gsup_message gsup_reply = {0};
vlr_subscr_gsup_insert_data(vsub, gsup);
vsub->vlr->ops.subscr_update(vsub);
gsup_reply.message_type = OSMO_GSUP_MSGT_INSERT_DATA_RESULT;
return vlr_subscr_tx_gsup_message(vsub, &gsup_reply);
}
/* Handle UpdateLocation Result from HLR */
static int vlr_subscr_handle_lu_res(struct vlr_subscr *vsub,
const struct osmo_gsup_message *gsup)
{
if (!vsub->lu_fsm) {
LOGVSUBP(LOGL_ERROR, vsub, "Rx GSUP LU Result "
"without LU in progress\n");
return -ENODEV;
}
/* contrary to MAP, we allow piggy-backing subscriber data onto the
* UPDATE LOCATION RESULT, and don't mandate the use of a separate
* nested INSERT SUBSCRIBER DATA transaction */
vlr_subscr_gsup_insert_data(vsub, gsup);
osmo_fsm_inst_dispatch(vsub->lu_fsm, VLR_ULA_E_HLR_LU_RES, NULL);
return 0;
}
/* Handle UpdateLocation Result from HLR */
static int vlr_subscr_handle_lu_err(struct vlr_subscr *vsub,
const struct osmo_gsup_message *gsup)
{
if (!vsub->lu_fsm) {
LOGVSUBP(LOGL_ERROR, vsub, "Rx GSUP LU Error "
"without LU in progress\n");
return -ENODEV;
}
LOGVSUBP(LOGL_DEBUG, vsub, "UpdateLocation failed; gmm_cause: %s\n",
get_value_string(gsm48_gmm_cause_names, gsup->cause));
osmo_fsm_inst_dispatch(vsub->lu_fsm, VLR_ULA_E_HLR_LU_RES,
(void *)&gsup->cause);
return 0;
}
/* Handle LOCATION CANCEL request from HLR */
static int vlr_subscr_handle_cancel_req(struct vlr_subscr *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);
vlr_subscr_cancel(vsub, gsup_msg->cause);
return 0;
}
/* Incoming handler for GSUP from HLR.
* Keep this function non-static for direct invocation by unit tests. */
int vlr_gsupc_read_cb(struct gsup_client *gsupc, struct msgb *msg)
{
struct vlr_instance *vlr = (struct vlr_instance *) gsupc->data;
struct vlr_subscr *vsub;
struct osmo_gsup_message gsup;
int rc;
DEBUGP(DVLR, "GSUP rx %u: %s\n", msgb_l2len(msg),
osmo_hexdump_nospc(msgb_l2(msg), msgb_l2len(msg)));
rc = osmo_gsup_decode(msgb_l2(msg), msgb_l2len(msg), &gsup);
if (rc < 0) {
LOGP(DVLR, LOGL_ERROR,
"decoding GSUP message fails with error '%s' (%d)\n",
get_value_string(gsm48_gmm_cause_names, -rc), -rc);
goto msgb_free_and_return;
}
if (!gsup.imsi[0]) {
LOGP(DVLR, LOGL_ERROR, "Missing IMSI in GSUP message\n");
if (OSMO_GSUP_IS_MSGT_REQUEST(gsup.message_type))
vlr_tx_gsup_error_reply(vlr, &gsup,
GMM_CAUSE_INV_MAND_INFO);
rc = -GMM_CAUSE_INV_MAND_INFO;
goto msgb_free_and_return;
}
vsub = vlr_subscr_find_by_imsi(vlr, gsup.imsi);
if (!vsub) {
switch (gsup.message_type) {
case OSMO_GSUP_MSGT_PURGE_MS_RESULT:
case OSMO_GSUP_MSGT_PURGE_MS_ERROR:
rc = vlr_rx_gsup_purge_no_subscr(vlr, &gsup);
goto msgb_free_and_return;
default:
rc = vlr_rx_gsup_unknown_imsi(vlr, &gsup);
goto msgb_free_and_return;
}
}
switch (gsup.message_type) {
case OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT:
case OSMO_GSUP_MSGT_SEND_AUTH_INFO_ERROR:
rc = vlr_subscr_handle_sai_res(vsub, &gsup);
break;
case OSMO_GSUP_MSGT_INSERT_DATA_REQUEST:
rc = vlr_subscr_handle_isd_req(vsub, &gsup);
break;
case OSMO_GSUP_MSGT_LOCATION_CANCEL_REQUEST:
rc = vlr_subscr_handle_cancel_req(vsub, &gsup);
break;
case OSMO_GSUP_MSGT_UPDATE_LOCATION_RESULT:
rc = vlr_subscr_handle_lu_res(vsub, &gsup);
break;
case OSMO_GSUP_MSGT_UPDATE_LOCATION_ERROR:
rc = vlr_subscr_handle_lu_err(vsub, &gsup);
break;
case OSMO_GSUP_MSGT_PURGE_MS_ERROR:
case OSMO_GSUP_MSGT_PURGE_MS_RESULT:
case OSMO_GSUP_MSGT_DELETE_DATA_REQUEST:
LOGVSUBP(LOGL_ERROR, vsub,
"Rx GSUP msg_type=%d not yet implemented\n",
gsup.message_type);
rc = -GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL;
break;
default:
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;
}
vlr_subscr_put(vsub);
msgb_free_and_return:
msgb_free(msg);
return rc;
}
/* MSC->VLR: Subscriber has provided IDENTITY RESPONSE */
int vlr_subscr_rx_id_resp(struct vlr_subscr *vsub,
const uint8_t *mi, size_t mi_len)
{
char mi_string[GSM48_MI_SIZE];
uint8_t mi_type = mi[0] & GSM_MI_TYPE_MASK;
gsm48_mi_to_string(mi_string, sizeof(mi_string), mi, mi_len);
/* update the vlr_subscr with the given identity */
switch (mi_type) {
case GSM_MI_TYPE_IMSI:
if (vsub->imsi[0]
&& !vlr_subscr_matches_imsi(vsub, mi_string)) {
LOGVSUBP(LOGL_ERROR, vsub, "IMSI in ID RESP differs:"
" %s\n", mi_string);
} else
vlr_subscr_set_imsi(vsub, mi_string);
break;
case GSM_MI_TYPE_IMEI:
vlr_subscr_set_imei(vsub, mi_string);
break;
case GSM_MI_TYPE_IMEISV:
vlr_subscr_set_imeisv(vsub, mi_string);
break;
}
if (vsub->auth_fsm) {
switch (mi_type) {
case GSM_MI_TYPE_IMSI:
osmo_fsm_inst_dispatch(vsub->auth_fsm,
VLR_AUTH_E_MS_ID_IMSI, mi_string);
break;
}
}
if (vsub->lu_fsm) {
uint32_t event = 0;
switch (mi_type) {
case GSM_MI_TYPE_IMSI:
event = VLR_ULA_E_ID_IMSI;
break;
case GSM_MI_TYPE_IMEI:
event = VLR_ULA_E_ID_IMEI;
break;
case GSM_MI_TYPE_IMEISV:
event = VLR_ULA_E_ID_IMEISV;
break;
default:
OSMO_ASSERT(0);
break;
}
osmo_fsm_inst_dispatch(vsub->lu_fsm, event, mi_string);
} else {
LOGVSUBP(LOGL_NOTICE, vsub, "gratuitous ID RESPONSE?!?\n");
}
return 0;
}
/* MSC->VLR: Subscriber has provided IDENTITY RESPONSE */
int vlr_subscr_rx_tmsi_reall_compl(struct vlr_subscr *vsub)
{
if (vsub->lu_fsm) {
return osmo_fsm_inst_dispatch(vsub->lu_fsm,
VLR_ULA_E_NEW_TMSI_ACK, NULL);
} else if (vsub->proc_arq_fsm) {
return osmo_fsm_inst_dispatch(vsub->proc_arq_fsm,
PR_ARQ_E_TMSI_ACK, NULL);
} else {
LOGVSUBP(LOGL_NOTICE, vsub,
"gratuitous TMSI REALLOC COMPL");
return -EINVAL;
}
}
int vlr_subscr_rx_imsi_detach(struct vlr_subscr *vsub)
{
/* paranoia: should any LU or PARQ FSMs still be running, stop them. */
vlr_subscr_cancel(vsub, GMM_CAUSE_IMPL_DETACHED);
vsub->imsi_detached_flag = true;
if (vsub->lu_complete) {
vsub->lu_complete = false;
/* balancing the get from vlr_lu_compl_fsm_success() */
vlr_subscr_put(vsub);
}
return 0;
}
/* Tear down any running FSMs due to MSC connection timeout.
* Visit all vsub->*_fsm pointers and give them a queue to send a final reject
* message before the entire connection is torn down.
* \param[in] vsub subscriber to tear down
*/
void vlr_subscr_conn_timeout(struct vlr_subscr *vsub)
{
if (!vsub)
return;
vlr_subscr_get(vsub);
if (vsub->lu_fsm)
vlr_loc_update_conn_timeout(vsub->lu_fsm);
if (vsub->proc_arq_fsm)
vlr_parq_conn_timeout(vsub->proc_arq_fsm);
vlr_subscr_put(vsub);
}
struct vlr_instance *vlr_alloc(void *ctx, const struct vlr_ops *ops)
{
struct vlr_instance *vlr = talloc_zero(ctx, struct vlr_instance);
OSMO_ASSERT(vlr);
/* Some of these are needed only on UTRAN, but in case the caller wants
* only GERAN, she should just provide dummy callbacks. */
OSMO_ASSERT(ops->tx_auth_req);
OSMO_ASSERT(ops->tx_auth_rej);
OSMO_ASSERT(ops->tx_id_req);
OSMO_ASSERT(ops->tx_lu_acc);
OSMO_ASSERT(ops->tx_lu_rej);
OSMO_ASSERT(ops->tx_cm_serv_acc);
OSMO_ASSERT(ops->tx_cm_serv_rej);
OSMO_ASSERT(ops->set_ciph_mode);
OSMO_ASSERT(ops->tx_common_id);
OSMO_ASSERT(ops->subscr_update);
OSMO_ASSERT(ops->subscr_assoc);
INIT_LLIST_HEAD(&vlr->subscribers);
INIT_LLIST_HEAD(&vlr->operations);
memcpy(&vlr->ops, ops, sizeof(vlr->ops));
/* defaults */
vlr->cfg.assign_tmsi = true;
/* osmo_auth_fsm.c */
osmo_fsm_register(&vlr_auth_fsm);
/* osmo_lu_fsm.c */
vlr_lu_fsm_init();
/* vlr_access_request_fsm.c */
vlr_parq_fsm_init();
return vlr;
}
int vlr_start(const char *gsup_unit_name, struct vlr_instance *vlr,
const char *gsup_server_addr_str, uint16_t gsup_server_port)
{
OSMO_ASSERT(vlr);
vlr->gsup_client = gsup_client_create(gsup_unit_name,
gsup_server_addr_str,
gsup_server_port,
&vlr_gsupc_read_cb, NULL);
if (!vlr->gsup_client)
return -ENOMEM;
vlr->gsup_client->data = vlr;
return 0;
}
/* MSC->VLR: Subscribre has disconnected */
int vlr_subscr_disconnected(struct vlr_subscr *vsub)
{
/* This corresponds to a MAP-ABORT from MSC->VLR on a classic B
* interface */
osmo_fsm_inst_term(vsub->lu_fsm, OSMO_FSM_TERM_REQUEST, NULL);
osmo_fsm_inst_term(vsub->auth_fsm, OSMO_FSM_TERM_REQUEST, NULL);
vsub->msc_conn_ref = NULL;
return 0;
}
/* MSC->VLR: Receive Authentication Failure from Subscriber */
int vlr_subscr_rx_auth_fail(struct vlr_subscr *vsub, const uint8_t *auts)
{
struct vlr_auth_resp_par par = {0};
par.auts = auts;
osmo_fsm_inst_dispatch(vsub->auth_fsm, VLR_AUTH_E_MS_AUTH_FAIL, &par);
return 0;
}
/* MSC->VLR: Receive Authentication Response from MS
* \returns 1 in case of success, 0 in case of delay, -1 on auth error */
int vlr_subscr_rx_auth_resp(struct vlr_subscr *vsub, bool is_r99,
bool is_utran, const uint8_t *res, uint8_t res_len)
{
struct osmo_fsm_inst *auth_fi = vsub->auth_fsm;
struct vlr_auth_resp_par par;
par.is_r99 = is_r99;
par.is_utran = is_utran;
par.res = res;
par.res_len = res_len;
osmo_fsm_inst_dispatch(auth_fi, VLR_AUTH_E_MS_AUTH_RESP, (void *) &par);
return 0;
}
/* MSC->VLR: Receive result of Ciphering Mode Command from MS */
void vlr_subscr_rx_ciph_res(struct vlr_subscr *vsub, struct vlr_ciph_result *res)
{
if (vsub->lu_fsm && vsub->lu_fsm->state == VLR_ULA_S_WAIT_CIPH)
osmo_fsm_inst_dispatch(vsub->lu_fsm, VLR_ULA_E_CIPH_RES, res);
if (vsub->proc_arq_fsm
&& vsub->proc_arq_fsm->state == PR_ARQ_S_WAIT_CIPH)
osmo_fsm_inst_dispatch(vsub->proc_arq_fsm, PR_ARQ_E_CIPH_RES,
res);
}
/* Internal evaluation of requested ciphering mode.
* Send set_ciph_mode() to MSC depending on the ciph_mode argument.
* \param[in] vlr VLR instance.
* \param[in] fi Calling FSM instance, for logging.
* \param[in] msc_conn_ref MSC conn to send to.
* \param[in] ciph_mode Ciphering config, to decide whether to do ciphering.
* \returns 0 if no ciphering is needed or message was sent successfully,
* or a negative value if ciph_mode is invalid or sending failed.
*/
int vlr_set_ciph_mode(struct vlr_instance *vlr,
struct osmo_fsm_inst *fi,
void *msc_conn_ref,
enum vlr_ciph ciph_mode,
bool umts_aka,
bool retrieve_imeisv)
{
switch (ciph_mode) {
case VLR_CIPH_NONE:
return 0;
case VLR_CIPH_A5_1:
case VLR_CIPH_A5_3:
LOGPFSML(fi, LOGL_DEBUG, "Set Ciphering Mode: %d=%s\n",
ciph_mode, vlr_ciph_name(ciph_mode));
return vlr->ops.set_ciph_mode(msc_conn_ref,
ciph_mode,
umts_aka,
retrieve_imeisv);
case VLR_CIPH_A5_2:
/* TODO policy by user config? */
LOGPFSML(fi, LOGL_ERROR, "A5/2 ciphering is not allowed\n");
return -EINVAL;
default:
LOGPFSML(fi, LOGL_ERROR, "unknown ciphering value: %d\n",
ciph_mode);
return -EINVAL;
}
}
/* Decide whether UMTS AKA should be used.
* UTRAN networks are by definition R99 capable, and the auth vector is required to contain UMTS AKA
* tokens. This is expected to be verified by the caller. On GERAN, UMTS AKA must be used iff MS and
* GERAN are R99 capable and UMTS AKA tokens are available.
* \param[in] vec Auth tokens (received from the HLR).
* \param[in] is_r99 True when BTS and GERAN are R99 capable.
* \returns true to use UMTS AKA, false to use pre-R99 GSM AKA.
*/
bool vlr_use_umts_aka(struct osmo_auth_vector *vec, bool is_r99)
{
if (!is_r99)
return false;
if (!(vec->auth_types & OSMO_AUTH_TYPE_UMTS))
return false;
return true;
}
void log_set_filter_vlr_subscr(struct log_target *target,
struct vlr_subscr *vlr_subscr)
{
struct vlr_subscr **fsub = (void*)&target->filter_data[LOG_FLT_VLR_SUBSCR];
/* free the old data */
if (*fsub) {
vlr_subscr_put(*fsub);
*fsub = NULL;
}
if (vlr_subscr) {
target->filter_map |= (1 << LOG_FLT_VLR_SUBSCR);
*fsub = vlr_subscr_get(vlr_subscr);
} else
target->filter_map &= ~(1 << LOG_FLT_VLR_SUBSCR);
}
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