| /* MS subscriber data handling */ |
| |
| /* (C) 2014 by sysmocom s.f.m.c. GmbH |
| * |
| * 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 <openbsc/gsm_subscriber.h> |
| #include <openbsc/gprs_gsup_client.h> |
| |
| #include <openbsc/sgsn.h> |
| #include <openbsc/gprs_sgsn.h> |
| #include <openbsc/gprs_gmm.h> |
| #include <openbsc/gprs_gsup_messages.h> |
| |
| #include <openbsc/debug.h> |
| |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| |
| extern void *tall_bsc_ctx; |
| |
| static int gsup_read_cb(struct gprs_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 = gprs_gsup_client_create( |
| addr_str, sgi->cfg.gsup_server_port, |
| &gsup_read_cb); |
| |
| if (!sgi->gsup_client) |
| return -1; |
| |
| return 1; |
| } |
| |
| static int gsup_read_cb(struct gprs_gsup_client *gsupc, struct msgb *msg) |
| { |
| int rc; |
| |
| rc = gprs_subscr_rx_gsup_message(msg); |
| if (rc < 0) |
| return -1; |
| |
| return rc; |
| } |
| |
| 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); |
| |
| for (idx = 0; idx < ARRAY_SIZE(sdata->auth_triplets); idx++) |
| sdata->auth_triplets[idx].key_seq = GSM_KEY_SEQ_INVAL; |
| |
| return sdata; |
| } |
| |
| struct gsm_subscriber *gprs_subscr_get_or_create(const char *imsi) |
| { |
| struct gsm_subscriber *subscr; |
| |
| subscr = subscr_get_or_create(NULL, imsi); |
| if (!subscr) |
| return NULL; |
| |
| if (!subscr->sgsn_data) |
| subscr->sgsn_data = sgsn_subscriber_data_alloc(subscr); |
| |
| subscr->keep_in_ram = 1; |
| |
| return subscr; |
| } |
| |
| struct gsm_subscriber *gprs_subscr_get_by_imsi(const char *imsi) |
| { |
| return subscr_active_by_imsi(NULL, imsi); |
| } |
| |
| void gprs_subscr_delete(struct gsm_subscriber *subscr) |
| { |
| if (subscr->sgsn_data->mm) { |
| subscr_put(subscr->sgsn_data->mm->subscr); |
| subscr->sgsn_data->mm->subscr = NULL; |
| subscr->sgsn_data->mm = NULL; |
| } |
| |
| if ((subscr->flags & GPRS_SUBSCRIBER_CANCELLED) || |
| (subscr->flags & GSM_SUBSCRIBER_FIRST_CONTACT)) |
| subscr->keep_in_ram = 0; |
| |
| subscr_put(subscr); |
| } |
| |
| void gprs_subscr_put_and_cancel(struct gsm_subscriber *subscr) |
| { |
| subscr->authorized = 0; |
| subscr->flags |= GPRS_SUBSCRIBER_CANCELLED; |
| |
| gprs_subscr_update(subscr); |
| |
| gprs_subscr_delete(subscr); |
| } |
| |
| static int gprs_subscr_tx_gsup_message(struct gsm_subscriber *subscr, |
| struct gprs_gsup_message *gsup_msg) |
| { |
| struct msgb *msg = gprs_gsup_msgb_alloc(); |
| |
| strncpy(gsup_msg->imsi, subscr->imsi, sizeof(gsup_msg->imsi) - 1); |
| |
| gprs_gsup_encode(msg, gsup_msg); |
| |
| LOGMMCTXP(LOGL_INFO, subscr->sgsn_data->mm, |
| "Sending GSUP, will send: %s\n", msgb_hexdump(msg)); |
| |
| if (!sgsn->gsup_client) { |
| msgb_free(msg); |
| return -ENOTSUP; |
| } |
| |
| return gprs_gsup_client_send(sgsn->gsup_client, msg); |
| } |
| |
| static int gprs_subscr_handle_gsup_auth_res(struct gsm_subscriber *subscr, |
| struct gprs_gsup_message *gsup_msg) |
| { |
| unsigned idx; |
| struct sgsn_subscriber_data *sdata = subscr->sgsn_data; |
| |
| LOGP(DGPRS, LOGL_INFO, |
| "Got SendAuthenticationInfoResult, num_auth_tuples = %d\n", |
| gsup_msg->num_auth_tuples); |
| |
| if (gsup_msg->num_auth_tuples > 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_tuples; idx++) { |
| size_t key_seq = gsup_msg->auth_tuples[idx].key_seq; |
| LOGP(DGPRS, LOGL_DEBUG, "Adding auth tuple, cksn = %d\n", key_seq); |
| if (key_seq >= ARRAY_SIZE(sdata->auth_triplets)) { |
| LOGP(DGPRS, LOGL_NOTICE, |
| "Skipping auth triplet with invalid cksn %d\n", |
| key_seq); |
| continue; |
| } |
| sdata->auth_triplets[key_seq] = gsup_msg->auth_tuples[idx]; |
| } |
| |
| sdata->auth_triplets_updated = 1; |
| |
| gprs_subscr_update_auth_info(subscr); |
| |
| return 0; |
| } |
| |
| static int gprs_subscr_handle_gsup_upd_loc_res(struct gsm_subscriber *subscr, |
| struct gprs_gsup_message *gsup_msg) |
| { |
| unsigned idx; |
| |
| if (gsup_msg->pdp_info_compl) { |
| LOGP(DGPRS, LOGL_INFO, "Would clear existing PDP info\n"); |
| |
| /* TODO: clear existing PDP info entries */ |
| } |
| |
| for (idx = 0; idx < gsup_msg->num_pdp_infos; idx++) { |
| struct gprs_gsup_pdp_info *pdp_info = &gsup_msg->pdp_infos[idx]; |
| size_t ctx_id = pdp_info->context_id; |
| |
| LOGP(DGPRS, LOGL_INFO, |
| "Would set PDP info, context id = %d, APN = %s\n", |
| ctx_id, osmo_hexdump(pdp_info->apn_enc, pdp_info->apn_enc_len)); |
| |
| /* TODO: set PDP info [ctx_id] */ |
| } |
| |
| subscr->authorized = 1; |
| |
| gprs_subscr_update(subscr); |
| return 0; |
| } |
| |
| static int gprs_subscr_handle_gsup_auth_err(struct gsm_subscriber *subscr, |
| struct gprs_gsup_message *gsup_msg) |
| { |
| unsigned idx; |
| struct sgsn_subscriber_data *sdata = subscr->sgsn_data; |
| |
| LOGP(DGPRS, LOGL_INFO, |
| "Send authentication info has failed for IMSI %s with cause %d\n", |
| gsup_msg->imsi, 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; |
| |
| gprs_subscr_update_auth_info(subscr); |
| return 0; |
| } |
| |
| static int gprs_subscr_handle_gsup_upd_loc_err(struct gsm_subscriber *subscr, |
| struct gprs_gsup_message *gsup_msg) |
| { |
| LOGP(DGPRS, LOGL_INFO, |
| "Update location has failed for IMSI %s with cause %d\n", |
| gsup_msg->imsi, gsup_msg->cause); |
| |
| subscr->authorized = 0; |
| |
| gprs_subscr_update(subscr); |
| return 0; |
| } |
| |
| 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 gprs_gsup_message gsup_msg = {0}; |
| struct gsm_subscriber *subscr; |
| |
| rc = gprs_gsup_decode(data, data_len, &gsup_msg); |
| if (rc < 0) { |
| LOGP(DGPRS, LOGL_ERROR, |
| "decoding GSUP message fails with error code %d\n", -rc); |
| return rc; |
| } |
| |
| if (!gsup_msg.imsi[0]) |
| return -GMM_CAUSE_INV_MAND_INFO; |
| |
| if (gsup_msg.message_type == GPRS_GSUP_MSGT_INSERT_DATA_REQUEST) |
| subscr = gprs_subscr_get_or_create(gsup_msg.imsi); |
| else |
| subscr = gprs_subscr_get_by_imsi(gsup_msg.imsi); |
| |
| if (!subscr) { |
| LOGP(DGPRS, LOGL_NOTICE, |
| "Unknown IMSI %s, discarding GSUP message\n", gsup_msg.imsi); |
| return -GMM_CAUSE_IMSI_UNKNOWN; |
| } |
| |
| LOGP(DGPRS, LOGL_INFO, |
| "Received GSUP message of type 0x%02x for IMSI %s\n", |
| gsup_msg.message_type, gsup_msg.imsi); |
| |
| switch (gsup_msg.message_type) { |
| case GPRS_GSUP_MSGT_LOCATION_CANCEL_REQUEST: |
| gprs_subscr_put_and_cancel(subscr); |
| subscr = NULL; |
| break; |
| |
| case GPRS_GSUP_MSGT_SEND_AUTH_INFO_RESULT: |
| gprs_subscr_handle_gsup_auth_res(subscr, &gsup_msg); |
| break; |
| |
| case GPRS_GSUP_MSGT_SEND_AUTH_INFO_ERROR: |
| gprs_subscr_handle_gsup_auth_err(subscr, &gsup_msg); |
| break; |
| |
| case GPRS_GSUP_MSGT_UPDATE_LOCATION_RESULT: |
| gprs_subscr_handle_gsup_upd_loc_res(subscr, &gsup_msg); |
| break; |
| |
| case GPRS_GSUP_MSGT_UPDATE_LOCATION_ERROR: |
| gprs_subscr_handle_gsup_upd_loc_err(subscr, &gsup_msg); |
| break; |
| |
| case GPRS_GSUP_MSGT_PURGE_MS_ERROR: |
| case GPRS_GSUP_MSGT_PURGE_MS_RESULT: |
| case GPRS_GSUP_MSGT_INSERT_DATA_REQUEST: |
| case GPRS_GSUP_MSGT_DELETE_DATA_REQUEST: |
| LOGP(DGPRS, LOGL_ERROR, |
| "Rx GSUP message type %d not yet implemented\n", |
| gsup_msg.message_type); |
| rc = -GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL; |
| break; |
| |
| default: |
| LOGP(DGPRS, LOGL_ERROR, |
| "Rx GSUP message type %d not valid at SGSN\n", |
| gsup_msg.message_type); |
| rc = -GMM_CAUSE_MSGT_INCOMP_P_STATE; |
| break; |
| }; |
| |
| if (subscr) |
| subscr_put(subscr); |
| |
| return rc; |
| } |
| |
| int gprs_subscr_query_auth_info(struct gsm_subscriber *subscr) |
| { |
| struct gprs_gsup_message gsup_msg = {0}; |
| |
| LOGMMCTXP(LOGL_INFO, subscr->sgsn_data->mm, |
| "subscriber auth info is not available\n"); |
| |
| gsup_msg.message_type = GPRS_GSUP_MSGT_SEND_AUTH_INFO_REQUEST; |
| return gprs_subscr_tx_gsup_message(subscr, &gsup_msg); |
| } |
| |
| int gprs_subscr_location_update(struct gsm_subscriber *subscr) |
| { |
| struct gprs_gsup_message gsup_msg = {0}; |
| |
| LOGMMCTXP(LOGL_INFO, subscr->sgsn_data->mm, |
| "subscriber data is not available\n"); |
| |
| gsup_msg.message_type = GPRS_GSUP_MSGT_UPDATE_LOCATION_REQUEST; |
| return gprs_subscr_tx_gsup_message(subscr, &gsup_msg); |
| } |
| |
| void gprs_subscr_update(struct gsm_subscriber *subscr) |
| { |
| LOGMMCTXP(LOGL_DEBUG, subscr->sgsn_data->mm, "Updating subscriber data\n"); |
| |
| subscr->flags &= ~GPRS_SUBSCRIBER_UPDATE_LOCATION_PENDING; |
| subscr->flags &= ~GSM_SUBSCRIBER_FIRST_CONTACT; |
| |
| sgsn_update_subscriber_data(subscr->sgsn_data->mm, subscr); |
| } |
| |
| void gprs_subscr_update_auth_info(struct gsm_subscriber *subscr) |
| { |
| LOGMMCTXP(LOGL_DEBUG, subscr->sgsn_data->mm, |
| "Updating subscriber authentication info\n"); |
| |
| subscr->flags &= ~GPRS_SUBSCRIBER_UPDATE_AUTH_INFO_PENDING; |
| subscr->flags &= ~GSM_SUBSCRIBER_FIRST_CONTACT; |
| |
| sgsn_update_subscriber_data(subscr->sgsn_data->mm, subscr); |
| } |
| |
| struct gsm_subscriber *gprs_subscr_get_or_create_by_mmctx(struct sgsn_mm_ctx *mmctx) |
| { |
| struct gsm_subscriber *subscr = NULL; |
| |
| if (mmctx->subscr) |
| return 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 |= GSM_SUBSCRIBER_FIRST_CONTACT; |
| } |
| |
| if (strcpy(subscr->equipment.imei, mmctx->imei) != 0) { |
| strncpy(subscr->equipment.imei, mmctx->imei, GSM_IMEI_LENGTH-1); |
| subscr->equipment.imei[GSM_IMEI_LENGTH-1] = 0; |
| } |
| |
| if (subscr->lac != mmctx->ra.lac) |
| subscr->lac = mmctx->ra.lac; |
| |
| subscr->sgsn_data->mm = mmctx; |
| mmctx->subscr = subscr_get(subscr); |
| |
| return subscr; |
| } |
| |
| int gprs_subscr_request_update_location(struct sgsn_mm_ctx *mmctx) |
| { |
| struct gsm_subscriber *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); |
| subscr_put(subscr); |
| return rc; |
| } |
| |
| int gprs_subscr_request_auth_info(struct sgsn_mm_ctx *mmctx) |
| { |
| struct gsm_subscriber *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); |
| subscr_put(subscr); |
| return rc; |
| } |