| /* main MSC management code... */ |
| |
| /* |
| * (C) 2010,2013 by Holger Hans Peter Freyther <zecke@selfish.org> |
| * (C) 2010 by On-Waves |
| * |
| * 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/msc/osmo_msc.h> |
| #include <osmocom/msc/debug.h> |
| #include <osmocom/msc/transaction.h> |
| #include <osmocom/msc/db.h> |
| #include <osmocom/msc/vlr.h> |
| #include <osmocom/msc/osmo_msc.h> |
| #include <osmocom/msc/a_iface.h> |
| #include <osmocom/msc/gsm_04_08.h> |
| #include <osmocom/msc/gsm_04_11.h> |
| |
| #include "../../bscconfig.h" |
| #ifdef BUILD_IU |
| #include <osmocom/ranap/iu_client.h> |
| #else |
| #include <osmocom/msc/iu_dummy.h> |
| #endif |
| |
| struct gsm_network *gsm_network_init(void *ctx, mncc_recv_cb_t mncc_recv) |
| { |
| struct gsm_network *net; |
| |
| net = talloc_zero(ctx, struct gsm_network); |
| if (!net) |
| return NULL; |
| |
| net->plmn = (struct osmo_plmn_id){ .mcc=1, .mnc=1 }; |
| |
| /* Permit a compile-time default of A5/3 and A5/1 */ |
| net->a5_encryption_mask = (1 << 3) | (1 << 1); |
| |
| /* Use 30 min periodic update interval as sane default */ |
| net->t3212 = 5; |
| |
| net->paging_response_timer = MSC_PAGING_RESPONSE_TIMER_DEFAULT; |
| |
| INIT_LLIST_HEAD(&net->trans_list); |
| INIT_LLIST_HEAD(&net->upqueue); |
| INIT_LLIST_HEAD(&net->subscr_conns); |
| |
| /* init statistics */ |
| net->msc_ctrs = rate_ctr_group_alloc(net, &msc_ctrg_desc, 0); |
| if (!net->msc_ctrs) { |
| talloc_free(net); |
| return NULL; |
| } |
| net->active_calls = osmo_counter_alloc("msc.active_calls"); |
| |
| net->mncc_recv = mncc_recv; |
| |
| INIT_LLIST_HEAD(&net->a.bscs); |
| |
| return net; |
| } |
| |
| /* Receive a SAPI-N-REJECT from BSC */ |
| void msc_sapi_n_reject(struct gsm_subscriber_connection *conn, int dlci) |
| { |
| int sapi = dlci & 0x7; |
| |
| if (sapi == UM_SAPI_SMS) |
| gsm411_sapi_n_reject(conn); |
| } |
| |
| /* receive a Level 3 Complete message and return MSC_CONN_ACCEPT or |
| * MSC_CONN_REJECT */ |
| int msc_compl_l3(struct gsm_subscriber_connection *conn, |
| struct msgb *msg, uint16_t chosen_channel) |
| { |
| msc_subscr_conn_get(conn, MSC_CONN_USE_COMPL_L3); |
| gsm0408_dispatch(conn, msg); |
| |
| msc_subscr_conn_put(conn, MSC_CONN_USE_COMPL_L3); |
| |
| /* Always return acceptance, because even if the conn was not accepted, |
| * we assumed ownership of it and the caller shall not interfere with |
| * that. We may even already have discarded the conn. */ |
| return MSC_CONN_ACCEPT; |
| |
| #if 0 |
| /* |
| * If this is a silent call we want the channel to remain open as long as |
| * possible and this is why we accept this connection regardless of any |
| * pending transaction or ongoing operation. |
| */ |
| if (conn->silent_call) |
| return MSC_CONN_ACCEPT; |
| if (conn->loc_operation || conn->sec_operation || conn->anch_operation) |
| return MSC_CONN_ACCEPT; |
| if (trans_has_conn(conn)) |
| return MSC_CONN_ACCEPT; |
| |
| LOGP(DRR, LOGL_INFO, "MSC Complete L3: Rejecting connection.\n"); |
| return MSC_CONN_REJECT; |
| #endif |
| } |
| |
| /* Receive a DTAP message from BSC */ |
| void msc_dtap(struct gsm_subscriber_connection *conn, uint8_t link_id, struct msgb *msg) |
| { |
| msc_subscr_conn_get(conn, MSC_CONN_USE_DTAP); |
| gsm0408_dispatch(conn, msg); |
| |
| msc_subscr_conn_put(conn, MSC_CONN_USE_DTAP); |
| } |
| |
| /* Receive an ASSIGNMENT COMPLETE from BSC */ |
| void msc_assign_compl(struct gsm_subscriber_connection *conn, |
| uint8_t rr_cause, uint8_t chosen_channel, |
| uint8_t encr_alg_id, uint8_t speec) |
| { |
| LOGP(DRR, LOGL_DEBUG, "MSC assign complete (do nothing).\n"); |
| } |
| |
| /* Receive an ASSIGNMENT FAILURE from BSC */ |
| void msc_assign_fail(struct gsm_subscriber_connection *conn, |
| uint8_t cause, uint8_t *rr_cause) |
| { |
| LOGP(DRR, LOGL_DEBUG, "MSC assign failure (do nothing).\n"); |
| } |
| |
| /* Receive a CLASSMARK CHANGE from BSC */ |
| void msc_classmark_chg(struct gsm_subscriber_connection *conn, |
| const uint8_t *cm2, uint8_t cm2_len, |
| const uint8_t *cm3, uint8_t cm3_len) |
| { |
| if (cm2 && cm2_len) { |
| if (cm2_len > sizeof(conn->classmark.classmark2)) { |
| LOGP(DRR, LOGL_NOTICE, "%s: classmark2 is %u bytes, truncating at %zu bytes\n", |
| vlr_subscr_name(conn->vsub), cm2_len, sizeof(conn->classmark.classmark2)); |
| cm2_len = sizeof(conn->classmark.classmark2); |
| } |
| conn->classmark.classmark2_len = cm2_len; |
| memcpy(conn->classmark.classmark2, cm2, cm2_len); |
| } |
| if (cm3 && cm3_len) { |
| if (cm3_len > sizeof(conn->classmark.classmark3)) { |
| LOGP(DRR, LOGL_NOTICE, "%s: classmark3 is %u bytes, truncating at %zu bytes\n", |
| vlr_subscr_name(conn->vsub), cm3_len, sizeof(conn->classmark.classmark3)); |
| cm3_len = sizeof(conn->classmark.classmark3); |
| } |
| conn->classmark.classmark3_len = cm3_len; |
| memcpy(conn->classmark.classmark3, cm3, cm3_len); |
| } |
| } |
| |
| /* Receive a CIPHERING MODE COMPLETE from BSC */ |
| void msc_cipher_mode_compl(struct gsm_subscriber_connection *conn, |
| struct msgb *msg, uint8_t alg_id) |
| { |
| struct vlr_ciph_result ciph_res = { .cause = VLR_CIPH_REJECT }; |
| |
| if (!conn) { |
| LOGP(DRR, LOGL_ERROR, "invalid: rx Ciphering Mode Complete on NULL conn\n"); |
| return; |
| } |
| if (!conn->vsub) { |
| LOGP(DRR, LOGL_ERROR, "invalid: rx Ciphering Mode Complete for NULL subscr\n"); |
| return; |
| } |
| |
| DEBUGP(DRR, "%s: CIPHERING MODE COMPLETE\n", vlr_subscr_name(conn->vsub)); |
| |
| if (msg) { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); |
| struct tlv_parsed tp; |
| uint8_t mi_type; |
| |
| if (!gh) { |
| LOGP(DRR, LOGL_ERROR, "invalid: msgb without l3 header\n"); |
| return; |
| } |
| |
| tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0); |
| |
| /* bearer capability */ |
| if (TLVP_PRESENT(&tp, GSM48_IE_MOBILE_ID)) { |
| mi_type = TLVP_VAL(&tp, GSM48_IE_MOBILE_ID)[0] & GSM_MI_TYPE_MASK; |
| if (mi_type == GSM_MI_TYPE_IMEISV |
| && TLVP_LEN(&tp, GSM48_IE_MOBILE_ID) > 0) { |
| gsm48_mi_to_string(ciph_res.imeisv, sizeof(ciph_res.imeisv), |
| TLVP_VAL(&tp, GSM48_IE_MOBILE_ID), |
| TLVP_LEN(&tp, GSM48_IE_MOBILE_ID)); |
| } |
| } |
| } |
| |
| ciph_res.cause = VLR_CIPH_COMPL; |
| vlr_subscr_rx_ciph_res(conn->vsub, &ciph_res); |
| } |
| |
| /* Receive a CLEAR REQUEST from BSC */ |
| int msc_clear_request(struct gsm_subscriber_connection *conn, uint32_t cause) |
| { |
| msc_subscr_conn_close(conn, cause); |
| return 1; |
| } |
| |
| /* increment the ref-count. Needs to be called by every user */ |
| struct gsm_subscriber_connection * |
| _msc_subscr_conn_get(struct gsm_subscriber_connection *conn, |
| enum msc_subscr_conn_use balance_token, |
| const char *file, int line) |
| { |
| OSMO_ASSERT(conn); |
| |
| if (balance_token != MSC_CONN_USE_UNTRACKED) { |
| uint32_t flag = 1 << balance_token; |
| OSMO_ASSERT(balance_token < 32); |
| if (conn->use_tokens & flag) |
| LOGPSRC(DREF, LOGL_ERROR, file, line, |
| "%s: MSC conn use error: using an already used token: %s\n", |
| vlr_subscr_name(conn->vsub), |
| msc_subscr_conn_use_name(balance_token)); |
| conn->use_tokens |= flag; |
| } |
| |
| conn->use_count++; |
| LOGPSRC(DREF, LOGL_DEBUG, file, line, |
| "%s: MSC conn use + %s == %u (0x%x)\n", |
| vlr_subscr_name(conn->vsub), msc_subscr_conn_use_name(balance_token), |
| conn->use_count, conn->use_tokens); |
| |
| return conn; |
| } |
| |
| /* decrement the ref-count. Once it reaches zero, we release */ |
| void _msc_subscr_conn_put(struct gsm_subscriber_connection *conn, |
| enum msc_subscr_conn_use balance_token, |
| const char *file, int line) |
| { |
| OSMO_ASSERT(conn); |
| |
| if (balance_token != MSC_CONN_USE_UNTRACKED) { |
| uint32_t flag = 1 << balance_token; |
| OSMO_ASSERT(balance_token < 32); |
| if (!(conn->use_tokens & flag)) |
| LOGPSRC(DREF, LOGL_ERROR, file, line, |
| "%s: MSC conn use error: freeing an unused token: %s\n", |
| vlr_subscr_name(conn->vsub), |
| msc_subscr_conn_use_name(balance_token)); |
| conn->use_tokens &= ~flag; |
| } |
| |
| if (conn->use_count == 0) { |
| LOGPSRC(DREF, LOGL_ERROR, file, line, |
| "%s: MSC conn use - %s failed: is already 0\n", |
| vlr_subscr_name(conn->vsub), |
| msc_subscr_conn_use_name(balance_token)); |
| return; |
| } |
| |
| conn->use_count--; |
| LOGPSRC(DREF, LOGL_DEBUG, file, line, |
| "%s: MSC conn use - %s == %u (0x%x)\n", |
| vlr_subscr_name(conn->vsub), msc_subscr_conn_use_name(balance_token), |
| conn->use_count, conn->use_tokens); |
| |
| if (conn->use_count == 0) |
| osmo_fsm_inst_dispatch(conn->fi, SUBSCR_CONN_E_UNUSED, NULL); |
| } |
| |
| bool msc_subscr_conn_used_by(struct gsm_subscriber_connection *conn, enum msc_subscr_conn_use token) |
| { |
| return conn && (conn->use_tokens & (1 << token)); |
| } |
| |
| const struct value_string msc_subscr_conn_use_names[] = { |
| {MSC_CONN_USE_UNTRACKED, "UNTRACKED"}, |
| {MSC_CONN_USE_COMPL_L3, "compl_l3"}, |
| {MSC_CONN_USE_DTAP, "dtap"}, |
| {MSC_CONN_USE_AUTH_CIPH, "auth+ciph"}, |
| {MSC_CONN_USE_CM_SERVICE, "cm_service"}, |
| {MSC_CONN_USE_TRANS_CC, "trans_cc"}, |
| {MSC_CONN_USE_TRANS_SMS, "trans_sms"}, |
| {MSC_CONN_USE_TRANS_USSD, "trans_ussd"}, |
| {MSC_CONN_USE_SILENT_CALL, "silent_call"}, |
| {MSC_CONN_USE_RELEASE, "release"}, |
| {0, NULL}, |
| }; |
| |
| void msc_stop_paging(struct vlr_subscr *vsub) |
| { |
| DEBUGP(DPAG, "Paging can stop for %s\n", vlr_subscr_name(vsub)); |
| /* tell BSCs and RNCs to stop paging? How? */ |
| } |