diff options
Diffstat (limited to 'src/libmsc/gsm_04_08.c')
| -rw-r--r-- | src/libmsc/gsm_04_08.c | 4047 |
1 files changed, 4047 insertions, 0 deletions
diff --git a/src/libmsc/gsm_04_08.c b/src/libmsc/gsm_04_08.c new file mode 100644 index 000000000..89108e466 --- /dev/null +++ b/src/libmsc/gsm_04_08.c @@ -0,0 +1,4047 @@ +/* GSM Mobile Radio Interface Layer 3 messages on the A-bis interface + * 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */ + +/* (C) 2008-2009 by Harald Welte <laforge@gnumonks.org> + * (C) 2008-2012 by Holger Hans Peter Freyther <zecke@selfish.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 <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <stdbool.h> +#include <errno.h> +#include <time.h> +#include <netinet/in.h> +#include <regex.h> +#include <sys/types.h> + +#include "bscconfig.h" + +#include <openbsc/auth.h> +#include <openbsc/db.h> +#include <openbsc/debug.h> +#include <openbsc/gsm_data.h> +#include <openbsc/gsm_subscriber.h> +#include <openbsc/gsm_04_11.h> +#include <openbsc/gsm_04_08.h> +#include <openbsc/gsm_04_80.h> +#include <openbsc/abis_rsl.h> +#include <openbsc/chan_alloc.h> +#include <openbsc/paging.h> +#include <openbsc/signal.h> +#include <osmocom/abis/trau_frame.h> +#include <openbsc/trau_mux.h> +#include <openbsc/rtp_proxy.h> +#include <openbsc/transaction.h> +#include <openbsc/ussd.h> +#include <openbsc/silent_call.h> +#include <openbsc/bsc_api.h> +#include <openbsc/osmo_msc.h> +#include <openbsc/handover.h> +#include <openbsc/mncc_int.h> +#include <osmocom/abis/e1_input.h> +#include <osmocom/core/bitvec.h> + +#include <osmocom/gsm/gsm48.h> +#include <osmocom/gsm/gsm0480.h> +#include <osmocom/gsm/gsm_utils.h> +#include <osmocom/gsm/protocol/gsm_04_08.h> +#include <osmocom/core/msgb.h> +#include <osmocom/core/talloc.h> +#include <osmocom/core/utils.h> +#include <osmocom/gsm/tlv.h> + +#include <assert.h> + +void *tall_locop_ctx; +void *tall_authciphop_ctx; + +static int tch_rtp_signal(struct gsm_lchan *lchan, int signal); + +static int gsm0408_loc_upd_acc(struct gsm_subscriber_connection *conn); +static int gsm48_tx_simple(struct gsm_subscriber_connection *conn, + uint8_t pdisc, uint8_t msg_type); +static void schedule_reject(struct gsm_subscriber_connection *conn); +static void release_anchor(struct gsm_subscriber_connection *conn); + +struct gsm_lai { + uint16_t mcc; + uint16_t mnc; + uint16_t lac; +}; + +static int apply_codec_restrictions(struct gsm_bts *bts, + struct gsm_mncc_bearer_cap *bcap) +{ + int i, j; + + /* remove unsupported speech versions from list */ + for (i = 0, j = 0; bcap->speech_ver[i] >= 0; i++) { + if (bcap->speech_ver[i] == GSM48_BCAP_SV_FR) + bcap->speech_ver[j++] = GSM48_BCAP_SV_FR; + if (bcap->speech_ver[i] == GSM48_BCAP_SV_EFR && bts->codec.efr) + bcap->speech_ver[j++] = GSM48_BCAP_SV_EFR; + if (bcap->speech_ver[i] == GSM48_BCAP_SV_AMR_F && bts->codec.amr) + bcap->speech_ver[j++] = GSM48_BCAP_SV_AMR_F; + if (bcap->speech_ver[i] == GSM48_BCAP_SV_HR && bts->codec.hr) + bcap->speech_ver[j++] = GSM48_BCAP_SV_HR; + if (bcap->speech_ver[i] == GSM48_BCAP_SV_AMR_H && bts->codec.amr) + bcap->speech_ver[j++] = GSM48_BCAP_SV_AMR_H; + } + bcap->speech_ver[j] = -1; + + return 0; +} + +static uint32_t new_callref = 0x80000001; + +void cc_tx_to_mncc(struct gsm_network *net, struct msgb *msg) +{ + net->mncc_recv(net, msg); +} + +static int gsm48_conn_sendmsg(struct msgb *msg, struct gsm_subscriber_connection *conn, + struct gsm_trans *trans) +{ + struct gsm48_hdr *gh = (struct gsm48_hdr *) msg->data; + + /* if we get passed a transaction reference, do some common + * work that the caller no longer has to do */ + if (trans) { + gh->proto_discr = trans->protocol | (trans->transaction_id << 4); + msg->lchan = trans->conn->lchan; + } + + if (msg->lchan) { + struct e1inp_sign_link *sign_link = + msg->lchan->ts->trx->rsl_link; + + msg->dst = sign_link; + if (gsm48_hdr_pdisc(gh) == GSM48_PDISC_CC) + DEBUGP(DCC, "(bts %d trx %d ts %d ti %02x) " + "Sending '%s' to MS.\n", + sign_link->trx->bts->nr, + sign_link->trx->nr, msg->lchan->ts->nr, + gh->proto_discr & 0xf0, + gsm48_cc_msg_name(gh->msg_type)); + else + DEBUGP(DCC, "(bts %d trx %d ts %d pd %02x) " + "Sending 0x%02x to MS.\n", + sign_link->trx->bts->nr, + sign_link->trx->nr, msg->lchan->ts->nr, + gh->proto_discr, gh->msg_type); + } + + return gsm0808_submit_dtap(conn, msg, 0, 0); +} + +int gsm48_cc_tx_notify_ss(struct gsm_trans *trans, const char *message) +{ + struct gsm48_hdr *gh; + struct msgb *ss_notify; + + ss_notify = gsm0480_create_notifySS(message); + if (!ss_notify) + return -1; + + gsm0480_wrap_invoke(ss_notify, GSM0480_OP_CODE_NOTIFY_SS, 0); + uint8_t *data = msgb_push(ss_notify, 1); + data[0] = ss_notify->len - 1; + gh = (struct gsm48_hdr *) msgb_push(ss_notify, sizeof(*gh)); + gh->msg_type = GSM48_MT_CC_FACILITY; + return gsm48_conn_sendmsg(ss_notify, trans->conn, trans); +} + +void release_security_operation(struct gsm_subscriber_connection *conn) +{ + if (!conn->sec_operation) + return; + + talloc_free(conn->sec_operation); + conn->sec_operation = NULL; + msc_release_connection(conn); +} + +void allocate_security_operation(struct gsm_subscriber_connection *conn) +{ + conn->sec_operation = talloc_zero(tall_authciphop_ctx, + struct gsm_security_operation); +} + +int gsm48_secure_channel(struct gsm_subscriber_connection *conn, int key_seq, + gsm_cbfn *cb, void *cb_data) +{ + struct gsm_network *net = conn->network; + struct gsm_subscriber *subscr = conn->subscr; + struct gsm_security_operation *op; + struct gsm_auth_tuple atuple; + int status = -1, rc; + + /* Check if we _can_ enable encryption. Cases where we can't: + * - Encryption disabled in config + * - Channel already secured (nothing to do) + * - Subscriber equipment doesn't support configured encryption + */ + if (!net->a5_encryption) { + status = GSM_SECURITY_NOAVAIL; + } else if (conn->lchan->encr.alg_id > RSL_ENC_ALG_A5(0)) { + DEBUGP(DMM, "Requesting to secure an already secure channel"); + status = GSM_SECURITY_ALREADY; + } else if (!ms_cm2_a5n_support(subscr->equipment.classmark2, + net->a5_encryption)) { + DEBUGP(DMM, "Subscriber equipment doesn't support requested encryption"); + status = GSM_SECURITY_NOAVAIL; + } + + /* If not done yet, try to get info for this user */ + if (status < 0) { + rc = auth_get_tuple_for_subscr(&atuple, subscr, key_seq); + if (rc <= 0) + status = GSM_SECURITY_NOAVAIL; + } + + /* Are we done yet ? */ + if (status >= 0) + return cb ? + cb(GSM_HOOK_RR_SECURITY, status, NULL, conn, cb_data) : + 0; + + /* Start an operation (can't have more than one pending !!!) */ + if (conn->sec_operation) + return -EBUSY; + + allocate_security_operation(conn); + op = conn->sec_operation; + op->cb = cb; + op->cb_data = cb_data; + memcpy(&op->atuple, &atuple, sizeof(struct gsm_auth_tuple)); + + /* FIXME: Should start a timer for completion ... */ + + /* Then do whatever is needed ... */ + if (rc == AUTH_DO_AUTH_THEN_CIPH) { + /* Start authentication */ + return gsm48_tx_mm_auth_req(conn, op->atuple.vec.rand, NULL, + op->atuple.key_seq); + } else if (rc == AUTH_DO_CIPH) { + /* Start ciphering directly */ + return gsm0808_cipher_mode(conn, net->a5_encryption, + op->atuple.vec.kc, 8, 0); + } + + return -EINVAL; /* not reached */ +} + +static bool subscr_regexp_check(const struct gsm_network *net, const char *imsi) +{ + if (!net->authorized_reg_str) + return false; + + if (regexec(&net->authorized_regexp, imsi, 0, NULL, 0) != REG_NOMATCH) + return true; + + return false; +} + +static int authorize_subscriber(struct gsm_loc_updating_operation *loc, + struct gsm_subscriber *subscriber) +{ + if (!subscriber) + return 0; + + /* + * Do not send accept yet as more information should arrive. Some + * phones will not send us the information and we will have to check + * what we want to do with that. + */ + if (loc && (loc->waiting_for_imsi || loc->waiting_for_imei)) + return 0; + + switch (subscriber->group->net->auth_policy) { + case GSM_AUTH_POLICY_CLOSED: + return subscriber->authorized; + case GSM_AUTH_POLICY_REGEXP: + if (subscriber->authorized) + return 1; + if (subscr_regexp_check(subscriber->group->net, + subscriber->imsi)) + subscriber->authorized = 1; + return subscriber->authorized; + case GSM_AUTH_POLICY_TOKEN: + if (subscriber->authorized) + return subscriber->authorized; + return (subscriber->flags & GSM_SUBSCRIBER_FIRST_CONTACT); + case GSM_AUTH_POLICY_ACCEPT_ALL: + return 1; + default: + return 0; + } +} + +static void _release_loc_updating_req(struct gsm_subscriber_connection *conn, int release) +{ + if (!conn->loc_operation) + return; + + /* No need to keep the connection up */ + release_anchor(conn); + + osmo_timer_del(&conn->loc_operation->updating_timer); + talloc_free(conn->loc_operation); + conn->loc_operation = NULL; + if (release) + msc_release_connection(conn); +} + +static void loc_updating_failure(struct gsm_subscriber_connection *conn, int release) +{ + if (!conn->loc_operation) + return; + LOGP(DMM, LOGL_ERROR, "Location Updating failed for %s\n", + subscr_name(conn->subscr)); + rate_ctr_inc(&conn->network->msc_ctrs->ctr[MSC_CTR_LOC_UPDATE_FAILED]); + _release_loc_updating_req(conn, release); +} + +static void loc_updating_success(struct gsm_subscriber_connection *conn, int release) +{ + if (!conn->loc_operation) + return; + LOGP(DMM, LOGL_INFO, "Location Updating completed for %s\n", + subscr_name(conn->subscr)); + rate_ctr_inc(&conn->network->msc_ctrs->ctr[MSC_CTR_LOC_UPDATE_COMPLETED]); + _release_loc_updating_req(conn, release); +} + +static void allocate_loc_updating_req(struct gsm_subscriber_connection *conn) +{ + if (conn->loc_operation) + LOGP(DMM, LOGL_ERROR, "Connection already had operation.\n"); + loc_updating_failure(conn, 0); + + conn->loc_operation = talloc_zero(tall_locop_ctx, + struct gsm_loc_updating_operation); +} + +static int finish_lu(struct gsm_subscriber_connection *conn) +{ + int rc = 0; + int avoid_tmsi = conn->network->avoid_tmsi; + + /* We're all good */ + if (avoid_tmsi) { + conn->subscr->tmsi = GSM_RESERVED_TMSI; + db_sync_subscriber(conn->subscr); + } else { + db_subscriber_alloc_tmsi(conn->subscr); + } + + rc = gsm0408_loc_upd_acc(conn); + if (conn->network->send_mm_info) { + /* send MM INFO with network name */ + rc = gsm48_tx_mm_info(conn); + } + + /* call subscr_update after putting the loc_upd_acc + * in the transmit queue, since S_SUBSCR_ATTACHED might + * trigger further action like SMS delivery */ + subscr_update(conn->subscr, conn->bts, + GSM_SUBSCRIBER_UPDATE_ATTACHED); + + /* + * The gsm0408_loc_upd_acc sends a MI with the TMSI. The + * MS needs to respond with a TMSI REALLOCATION COMPLETE + * (even if the TMSI is the same). + * If avoid_tmsi == true, we don't send a TMSI, we don't + * expect a reply and Location Updating is done. + */ + if (avoid_tmsi) + loc_updating_success(conn, 1); + + return rc; +} + +static int _gsm0408_authorize_sec_cb(unsigned int hooknum, unsigned int event, + struct msgb *msg, void *data, void *param) +{ + struct gsm_subscriber_connection *conn = data; + int rc = 0; + + switch (event) { + case GSM_SECURITY_AUTH_FAILED: + loc_updating_failure(conn, 1); + break; + + case GSM_SECURITY_ALREADY: + LOGP(DMM, LOGL_ERROR, "We don't expect LOCATION " + "UPDATING after CM SERVICE REQUEST\n"); + /* fall through */ + + case GSM_SECURITY_NOAVAIL: + case GSM_SECURITY_SUCCEEDED: + rc = finish_lu(conn); + break; + + default: + rc = -EINVAL; + }; + + return rc; +} + +static int gsm0408_authorize(struct gsm_subscriber_connection *conn, struct msgb *msg) +{ + if (!conn->loc_operation) + return 0; + + if (authorize_subscriber(conn->loc_operation, conn->subscr)) + return gsm48_secure_channel(conn, + conn->loc_operation->key_seq, + _gsm0408_authorize_sec_cb, NULL); + return 0; +} + +void gsm0408_clear_request(struct gsm_subscriber_connection *conn, uint32_t cause) +{ + struct gsm_trans *trans, *temp; + + /* avoid someone issuing a clear */ + conn->in_release = 1; + + /* + * Cancel any outstanding location updating request + * operation taking place on the subscriber connection. + */ + loc_updating_failure(conn, 0); + + /* We might need to cancel the paging response or such. */ + if (conn->sec_operation && conn->sec_operation->cb) { + conn->sec_operation->cb(GSM_HOOK_RR_SECURITY, GSM_SECURITY_AUTH_FAILED, + NULL, conn, conn->sec_operation->cb_data); + } + + release_security_operation(conn); + release_anchor(conn); + + /* + * Free all transactions that are associated with the released + * connection. The transaction code will inform the CC or SMS + * facilities that will send the release indications. As part of + * the CC REL_IND the remote leg might be released and this will + * trigger the call to trans_free. This is something the llist + * macro can not handle and we will need to re-iterate the list. + * + * TODO: Move the trans_list into the subscriber connection and + * create a pending list for MT transactions. These exist before + * we have a subscriber connection. + */ +restart: + llist_for_each_entry_safe(trans, temp, &conn->network->trans_list, entry) { + if (trans->conn == conn) { + trans_free(trans); + goto restart; + } + } +} + +void gsm0408_clear_all_trans(struct gsm_network *net, int protocol) +{ + struct gsm_trans *trans, *temp; + + LOGP(DCC, LOGL_NOTICE, "Clearing all currently active transactions!!!\n"); + + llist_for_each_entry_safe(trans, temp, &net->trans_list, entry) { + if (trans->protocol == protocol) { + trans->callref = 0; + trans_free(trans); + } + } +} + +/* Chapter 9.2.14 : Send LOCATION UPDATING REJECT */ +int gsm0408_loc_upd_rej(struct gsm_subscriber_connection *conn, uint8_t cause) +{ + struct gsm_bts *bts = conn->bts; + struct msgb *msg; + + msg = gsm48_create_loc_upd_rej(cause); + if (!msg) { + LOGP(DMM, LOGL_ERROR, "Failed to create msg for LOCATION UPDATING REJECT.\n"); + return -1; + } + + msg->lchan = conn->lchan; + + LOGP(DMM, LOGL_INFO, "Subscriber %s: LOCATION UPDATING REJECT " + "LAC=%u BTS=%u\n", subscr_name(conn->subscr), + bts->location_area_code, bts->nr); + + return gsm48_conn_sendmsg(msg, conn, NULL); +} + +/* Chapter 9.2.13 : Send LOCATION UPDATE ACCEPT */ +static int gsm0408_loc_upd_acc(struct gsm_subscriber_connection *conn) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 LOC UPD ACC"); + struct gsm48_hdr *gh; + struct gsm48_loc_area_id *lai; + uint8_t *mid; + + msg->lchan = conn->lchan; + + gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + gh->proto_discr = GSM48_PDISC_MM; + gh->msg_type = GSM48_MT_MM_LOC_UPD_ACCEPT; + + lai = (struct gsm48_loc_area_id *) msgb_put(msg, sizeof(*lai)); + gsm48_generate_lai(lai, conn->network->country_code, + conn->network->network_code, + conn->bts->location_area_code); + + if (conn->subscr->tmsi == GSM_RESERVED_TMSI) { + uint8_t mi[10]; + int len; + len = gsm48_generate_mid_from_imsi(mi, conn->subscr->imsi); + mid = msgb_put(msg, len); + memcpy(mid, mi, len); + } else { + mid = msgb_put(msg, GSM48_MID_TMSI_LEN); + gsm48_generate_mid_from_tmsi(mid, conn->subscr->tmsi); + } + + DEBUGP(DMM, "-> LOCATION UPDATE ACCEPT\n"); + + return gsm48_conn_sendmsg(msg, conn, NULL); +} + +/* Transmit Chapter 9.2.10 Identity Request */ +static int mm_tx_identity_req(struct gsm_subscriber_connection *conn, uint8_t id_type) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 ID REQ"); + struct gsm48_hdr *gh; + + msg->lchan = conn->lchan; + + gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); + gh->proto_discr = GSM48_PDISC_MM; + gh->msg_type = GSM48_MT_MM_ID_REQ; + gh->data[0] = id_type; + + return gsm48_conn_sendmsg(msg, conn, NULL); +} + +static struct gsm_subscriber *subscr_create(const struct gsm_network *net, + const char *imsi) +{ + if (!net->auto_create_subscr) + return NULL; + + if (!subscr_regexp_check(net, imsi)) + return NULL; + + return subscr_create_subscriber(net->subscr_group, imsi); +} + +/* Parse Chapter 9.2.11 Identity Response */ +static int mm_rx_id_resp(struct gsm_subscriber_connection *conn, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + struct gsm_network *net = conn->network; + uint8_t mi_type = gh->data[1] & GSM_MI_TYPE_MASK; + char mi_string[GSM48_MI_SIZE]; + + gsm48_mi_to_string(mi_string, sizeof(mi_string), &gh->data[1], gh->data[0]); + DEBUGP(DMM, "IDENTITY RESPONSE: MI(%s)=%s\n", + gsm48_mi_type_name(mi_type), mi_string); + + osmo_signal_dispatch(SS_SUBSCR, S_SUBSCR_IDENTITY, gh->data); + + switch (mi_type) { + case GSM_MI_TYPE_IMSI: + /* look up subscriber based on IMSI, create if not found */ + if (!conn->subscr) { + conn->subscr = subscr_get_by_imsi(net->subscr_group, + mi_string); + if (!conn->subscr) + conn->subscr = subscr_create(net, mi_string); + } + if (!conn->subscr && conn->loc_operation) { + gsm0408_loc_upd_rej(conn, net->reject_cause); + loc_updating_failure(conn, 1); + return 0; + } + if (conn->loc_operation) + conn->loc_operation->waiting_for_imsi = 0; + break; + case GSM_MI_TYPE_IMEI: + case GSM_MI_TYPE_IMEISV: + /* update subscribe <-> IMEI mapping */ + if (conn->subscr) { + db_subscriber_assoc_imei(conn->subscr, mi_string); + db_sync_equipment(&conn->subscr->equipment); + } + if (conn->loc_operation) + conn->loc_operation->waiting_for_imei = 0; + break; + } + + /* Check if we can let the mobile station enter */ + return gsm0408_authorize(conn, msg); +} + + +static void loc_upd_rej_cb(void *data) +{ + struct gsm_subscriber_connection *conn = data; + + LOGP(DMM, LOGL_DEBUG, "Location Updating Request procedure timedout.\n"); + gsm0408_loc_upd_rej(conn, conn->network->reject_cause); + loc_updating_failure(conn, 1); +} + +static void schedule_reject(struct gsm_subscriber_connection *conn) +{ + osmo_timer_setup(&conn->loc_operation->updating_timer, loc_upd_rej_cb, + conn); + osmo_timer_schedule(&conn->loc_operation->updating_timer, 5, 0); +} + +static const struct value_string lupd_names[] = { + { GSM48_LUPD_NORMAL, "NORMAL" }, + { GSM48_LUPD_PERIODIC, "PERIODIC" }, + { GSM48_LUPD_IMSI_ATT, "IMSI ATTACH" }, + { 0, NULL } +}; + +/* Chapter 9.2.15: Receive Location Updating Request */ +static int mm_rx_loc_upd_req(struct gsm_subscriber_connection *conn, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + struct gsm48_loc_upd_req *lu; + struct gsm_subscriber *subscr = NULL; + uint8_t mi_type; + char mi_string[GSM48_MI_SIZE]; + + lu = (struct gsm48_loc_upd_req *) gh->data; + + mi_type = lu->mi[0] & GSM_MI_TYPE_MASK; + + gsm48_mi_to_string(mi_string, sizeof(mi_string), lu->mi, lu->mi_len); + + DEBUGPC(DMM, "MI(%s)=%s type=%s ", gsm48_mi_type_name(mi_type), + mi_string, get_value_string(lupd_names, lu->type)); + + osmo_signal_dispatch(SS_SUBSCR, S_SUBSCR_IDENTITY, &lu->mi_len); + + switch (lu->type) { + case GSM48_LUPD_NORMAL: + rate_ctr_inc(&conn->network->msc_ctrs->ctr[MSC_CTR_LOC_UPDATE_TYPE_NORMAL]); + break; + case GSM48_LUPD_IMSI_ATT: + rate_ctr_inc(&conn->network->msc_ctrs->ctr[MSC_CTR_LOC_UPDATE_TYPE_ATTACH]); + break; + case GSM48_LUPD_PERIODIC: + rate_ctr_inc(&conn->network->msc_ctrs->ctr[MSC_CTR_LOC_UPDATE_TYPE_PERIODIC]); + break; + } + + /* + * Pseudo Spoof detection: Just drop a second/concurrent + * location updating request. + */ + if (conn->loc_operation) { + DEBUGPC(DMM, "ignoring request due an existing one: %p.\n", + conn->loc_operation); + gsm0408_loc_upd_rej(conn, GSM48_REJECT_PROTOCOL_ERROR); + return 0; + } + + allocate_loc_updating_req(conn); + + conn->loc_operation->key_seq = lu->key_seq; + + switch (mi_type) { + case GSM_MI_TYPE_IMSI: + DEBUGPC(DMM, "\n"); + /* we always want the IMEI, too */ + mm_tx_identity_req(conn, GSM_MI_TYPE_IMEI); + conn->loc_operation->waiting_for_imei = 1; + + /* look up subscriber based on IMSI, create if not found */ + subscr = subscr_get_by_imsi(conn->network->subscr_group, mi_string); + if (!subscr) + subscr = subscr_create(conn->network, mi_string); + if (!subscr) { + gsm0408_loc_upd_rej(conn, conn->network->reject_cause); + loc_updating_failure(conn, 0); /* FIXME: set release == true? */ + return 0; + } + break; + case GSM_MI_TYPE_TMSI: + DEBUGPC(DMM, "\n"); + /* look up the subscriber based on TMSI, request IMSI if it fails */ + subscr = subscr_get_by_tmsi(conn->network->subscr_group, + tmsi_from_string(mi_string)); + if (!subscr) { + /* send IDENTITY REQUEST message to get IMSI */ + mm_tx_identity_req(conn, GSM_MI_TYPE_IMSI); + conn->loc_operation->waiting_for_imsi = 1; + } + /* we always want the IMEI, too */ + mm_tx_identity_req(conn, GSM_MI_TYPE_IMEI); + conn->loc_operation->waiting_for_imei = 1; + break; + case GSM_MI_TYPE_IMEI: + case GSM_MI_TYPE_IMEISV: + /* no sim card... FIXME: what to do ? */ + DEBUGPC(DMM, "unimplemented mobile identity type\n"); + break; + default: + DEBUGPC(DMM, "unknown mobile identity type\n"); + break; + } + + /* schedule the reject timer */ + schedule_reject(conn); + + if (!subscr) { + DEBUGPC(DRR, "<- Can't find any subscriber for this ID\n"); + /* FIXME: request id? close channel? */ + return -EINVAL; + } + + conn->subscr = subscr; + conn->subscr->equipment.classmark1 = lu->classmark1; + + /* check if we can let the subscriber into our network immediately + * or if we need to wait for identity responses. */ + return gsm0408_authorize(conn, msg); +} + +/* Turn int into semi-octet representation: 98 => 0x89 */ +static uint8_t bcdify(uint8_t value) +{ + uint8_t ret; + + ret = value / 10; + ret |= (value % 10) << 4; + + return ret; +} + + +/* Section 9.2.15a */ +int gsm48_tx_mm_info(struct gsm_subscriber_connection *conn) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 MM INF"); + struct gsm48_hdr *gh; + struct gsm_network *net = conn->network; + uint8_t *ptr8; + int name_len, name_pad; + + time_t cur_t; + struct tm* gmt_time; + struct tm* local_time; + int tzunits; + int dst = 0; + + msg->lchan = conn->lchan; + + gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + gh->proto_discr = GSM48_PDISC_MM; + gh->msg_type = GSM48_MT_MM_INFO; + + if (net->name_long) { +#if 0 + name_len = strlen(net->name_long); + /* 10.5.3.5a */ + ptr8 = msgb_put(msg, 3); + ptr8[0] = GSM48_IE_NAME_LONG; + ptr8[1] = name_len*2 +1; + ptr8[2] = 0x90; /* UCS2, no spare bits, no CI */ + + ptr16 = (uint16_t *) msgb_put(msg, name_len*2); + for (i = 0; i < name_len; i++) + ptr16[i] = htons(net->name_long[i]); + + /* FIXME: Use Cell Broadcast, not UCS-2, since + * UCS-2 is only supported by later revisions of the spec */ +#endif + name_len = (strlen(net->name_long)*7)/8; + name_pad = (8 - strlen(net->name_long)*7)%8; + if (name_pad > 0) + name_len++; + /* 10.5.3.5a */ + ptr8 = msgb_put(msg, 3); + ptr8[0] = GSM48_IE_NAME_LONG; + ptr8[1] = name_len +1; + ptr8[2] = 0x80 | name_pad; /* Cell Broadcast DCS, no CI */ + + ptr8 = msgb_put(msg, name_len); + gsm_7bit_encode_n(ptr8, name_len, net->name_long, NULL); + + } + + if (net->name_short) { +#if 0 + name_len = strlen(net->name_short); + /* 10.5.3.5a */ + ptr8 = (uint8_t *) msgb_put(msg, 3); + ptr8[0] = GSM48_IE_NAME_SHORT; + ptr8[1] = name_len*2 + 1; + ptr8[2] = 0x90; /* UCS2, no spare bits, no CI */ + + ptr16 = (uint16_t *) msgb_put(msg, name_len*2); + for (i = 0; i < name_len; i++) + ptr16[i] = htons(net->name_short[i]); +#endif + name_len = (strlen(net->name_short)*7)/8; + name_pad = (8 - strlen(net->name_short)*7)%8; + if (name_pad > 0) + name_len++; + /* 10.5.3.5a */ + ptr8 = (uint8_t *) msgb_put(msg, 3); + ptr8[0] = GSM48_IE_NAME_SHORT; + ptr8[1] = name_len +1; + ptr8[2] = 0x80 | name_pad; /* Cell Broadcast DCS, no CI */ + + ptr8 = msgb_put(msg, name_len); + gsm_7bit_encode_n(ptr8, name_len, net->name_short, NULL); + + } + + /* Section 10.5.3.9 */ + cur_t = time(NULL); + gmt_time = gmtime(&cur_t); + + ptr8 = msgb_put(msg, 8); + ptr8[0] = GSM48_IE_NET_TIME_TZ; + ptr8[1] = bcdify(gmt_time->tm_year % 100); + ptr8[2] = bcdify(gmt_time->tm_mon + 1); + ptr8[3] = bcdify(gmt_time->tm_mday); + ptr8[4] = bcdify(gmt_time->tm_hour); + ptr8[5] = bcdify(gmt_time->tm_min); + ptr8[6] = bcdify(gmt_time->tm_sec); + + if (net->tz.override) { + /* Convert tz.hr and tz.mn to units */ + if (net->tz.hr < 0) { + tzunits = ((net->tz.hr/-1)*4); + tzunits = tzunits + (net->tz.mn/15); + ptr8[7] = bcdify(tzunits); + /* Set negative time */ + ptr8[7] |= 0x08; + } + else { + tzunits = net->tz.hr*4; + tzunits = tzunits + (net->tz.mn/15); + ptr8[7] = bcdify(tzunits); + } + /* Convert DST value */ + if (net->tz.dst >= 0 && net->tz.dst <= 2) + dst = net->tz.dst; + } + else { + /* Need to get GSM offset and convert into 15 min units */ + /* This probably breaks if gmtoff returns a value not evenly divisible by 15? */ + local_time = localtime(&cur_t); +#ifdef HAVE_TM_GMTOFF_IN_TM + tzunits = (local_time->tm_gmtoff/60)/15; +#else +#warning find a portable way to obtain the timezone offset + tzunits = 0; +#endif + if (tzunits < 0) { + tzunits = tzunits/-1; + ptr8[7] = bcdify(tzunits); + /* Flip it to negative */ + ptr8[7] |= 0x08; + } + else + ptr8[7] = bcdify(tzunits); + + /* Does not support DST +2 */ + if (local_time->tm_isdst) + dst = 1; + } + + if (dst) { + ptr8 = msgb_put(msg, 3); + ptr8[0] = GSM48_IE_NET_DST; + ptr8[1] = 1; + ptr8[2] = dst; + } + + DEBUGP(DMM, "-> MM INFO\n"); + + return gsm48_conn_sendmsg(msg, conn, NULL); +} + +/*! Send an Authentication Request to MS on the given subscriber connection + * according to 3GPP/ETSI TS 24.008, Section 9.2.2. + * \param[in] conn Subscriber connection to send on. + * \param[in] rand Random challenge token to send, must be 16 bytes long. + * \param[in] autn r99: In case of UMTS mutual authentication, AUTN token to + * send; must be 16 bytes long, or pass NULL for plain GSM auth. + * \param[in] key_seq auth tuple's sequence number. + */ +int gsm48_tx_mm_auth_req(struct gsm_subscriber_connection *conn, uint8_t *rand, + uint8_t *autn, int key_seq) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 AUTH REQ"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + struct gsm48_auth_req *ar = (struct gsm48_auth_req *) msgb_put(msg, sizeof(*ar)); + + DEBUGP(DMM, "-> AUTH REQ (rand = %s)\n", osmo_hexdump(rand, 16)); + if (autn) + DEBUGP(DMM, " AUTH REQ (autn = %s)\n", osmo_hexdump(autn, 16)); + + msg->lchan = conn->lchan; + gh->proto_discr = GSM48_PDISC_MM; + gh->msg_type = GSM48_MT_MM_AUTH_REQ; + + ar->key_seq = key_seq; + + /* 16 bytes RAND parameters */ + osmo_static_assert(sizeof(ar->rand) == 16, sizeof_auth_req_r99_rand); + if (rand) + memcpy(ar->rand, rand, 16); + + + /* 16 bytes AUTN */ + if (autn) + msgb_tlv_put(msg, GSM48_IE_AUTN, 16, autn); + + return gsm48_conn_sendmsg(msg, conn, NULL); +} + +/* Section 9.2.1 */ +int gsm48_tx_mm_auth_rej(struct gsm_subscriber_connection *conn) +{ + DEBUGP(DMM, "-> AUTH REJECT\n"); + return gsm48_tx_simple(conn, GSM48_PDISC_MM, GSM48_MT_MM_AUTH_REJ); +} + +/* + * At the 30C3 phones miss their periodic update + * interval a lot and then remain unreachable. In case + * we still know the TMSI we can just attach it again. + */ +static void implit_attach(struct gsm_subscriber_connection *conn) +{ + if (conn->subscr->lac != GSM_LAC_RESERVED_DETACHED) + return; + + subscr_update(conn->subscr, conn->bts, + GSM_SUBSCRIBER_UPDATE_ATTACHED); +} + + +static int _gsm48_rx_mm_serv_req_sec_cb( + unsigned int hooknum, unsigned int event, + struct msgb *msg, void *data, void *param) +{ + struct gsm_subscriber_connection *conn = data; + int rc = 0; + + /* auth failed or succeeded, the timer was stopped */ + conn->expire_timer_stopped = 1; + + switch (event) { + case GSM_SECURITY_AUTH_FAILED: + /* Nothing to do */ + break; + + case GSM_SECURITY_NOAVAIL: + case GSM_SECURITY_ALREADY: + rc = gsm48_tx_mm_serv_ack(conn); + implit_attach(conn); + break; + + case GSM_SECURITY_SUCCEEDED: + /* nothing to do. CIPHER MODE COMMAND is + * implicit CM SERV ACK */ + implit_attach(conn); + break; + + default: + rc = -EINVAL; + }; + + return rc; +} + +/* + * Handle CM Service Requests + * a) Verify that the packet is long enough to contain the information + * we require otherwsie reject with INCORRECT_MESSAGE + * b) Try to parse the TMSI. If we do not have one reject + * c) Check that we know the subscriber with the TMSI otherwise reject + * with a HLR cause + * d) Set the subscriber on the gsm_lchan and accept + */ +static int gsm48_rx_mm_serv_req(struct gsm_subscriber_connection *conn, struct msgb *msg) +{ + uint8_t mi_type; + char mi_string[GSM48_MI_SIZE]; + + struct gsm_network *network = conn->network; + struct gsm_subscriber *subscr; + struct gsm48_hdr *gh = msgb_l3(msg); + struct gsm48_service_request *req = + (struct gsm48_service_request *)gh->data; + /* unfortunately in Phase1 the classmark2 length is variable */ + uint8_t classmark2_len = gh->data[1]; + uint8_t *classmark2 = gh->data+2; + uint8_t mi_len = *(classmark2 + classmark2_len); + uint8_t *mi = (classmark2 + classmark2_len + 1); + + DEBUGP(DMM, "<- CM SERVICE REQUEST "); + if (msg->data_len < sizeof(struct gsm48_service_request*)) { + DEBUGPC(DMM, "wrong sized message\n"); + return gsm48_tx_mm_serv_rej(conn, + GSM48_REJECT_INCORRECT_MESSAGE); + } + + if (msg->data_len < req->mi_len + 6) { + DEBUGPC(DMM, "does not fit in packet\n"); + return gsm48_tx_mm_serv_rej(conn, + GSM48_REJECT_INCORRECT_MESSAGE); + } + + gsm48_mi_to_string(mi_string, sizeof(mi_string), mi, mi_len); + mi_type = mi[0] & GSM_MI_TYPE_MASK; + + if (mi_type == GSM_MI_TYPE_IMSI) { + DEBUGPC(DMM, "serv_type=0x%02x MI(%s)=%s\n", + req->cm_service_type, gsm48_mi_type_name(mi_type), + mi_string); + subscr = subscr_get_by_imsi(network->subscr_group, + mi_string); + } else if (mi_type == GSM_MI_TYPE_TMSI) { + DEBUGPC(DMM, "serv_type=0x%02x MI(%s)=%s\n", + req->cm_service_type, gsm48_mi_type_name(mi_type), + mi_string); + subscr = subscr_get_by_tmsi(network->subscr_group, + tmsi_from_string(mi_string)); + } else { + DEBUGPC(DMM, "mi_type is not expected: %d\n", mi_type); + return gsm48_tx_mm_serv_rej(conn, + GSM48_REJECT_INCORRECT_MESSAGE); + } + + osmo_signal_dispatch(SS_SUBSCR, S_SUBSCR_IDENTITY, (classmark2 + classmark2_len)); + + if (is_siemens_bts(conn->bts)) + send_siemens_mrpci(msg->lchan, classmark2-1); + + + /* FIXME: if we don't know the TMSI, inquire abit IMSI and allocate new TMSI */ + if (!subscr) + return gsm48_tx_mm_serv_rej(conn, + GSM48_REJECT_IMSI_UNKNOWN_IN_VLR); + + if (!conn->subscr) + conn->subscr = subscr; + else if (conn->subscr == subscr) + subscr_put(subscr); /* lchan already has a ref, don't need another one */ + else { + DEBUGP(DMM, "<- CM Channel already owned by someone else?\n"); + subscr_put(subscr); + } + + subscr->equipment.classmark2_len = classmark2_len; + memcpy(subscr->equipment.classmark2, classmark2, classmark2_len); + db_sync_equipment(&subscr->equipment); + + /* we will send a MM message soon */ + conn->expire_timer_stopped = 1; + + return gsm48_secure_channel(conn, req->cipher_key_seq, + _gsm48_rx_mm_serv_req_sec_cb, NULL); +} + +static int gsm48_rx_mm_imsi_detach_ind(struct gsm_subscriber_connection *conn, struct msgb *msg) +{ + struct gsm_network *network = conn->network; + struct gsm48_hdr *gh = msgb_l3(msg); + struct gsm48_imsi_detach_ind *idi = + (struct gsm48_imsi_detach_ind *) gh->data; + uint8_t mi_type = idi->mi[0] & GSM_MI_TYPE_MASK; + char mi_string[GSM48_MI_SIZE]; + struct gsm_subscriber *subscr = NULL; + + gsm48_mi_to_string(mi_string, sizeof(mi_string), idi->mi, idi->mi_len); + DEBUGP(DMM, "IMSI DETACH INDICATION: MI(%s)=%s", + gsm48_mi_type_name(mi_type), mi_string); + + rate_ctr_inc(&network->msc_ctrs->ctr[MSC_CTR_LOC_UPDATE_TYPE_DETACH]); + + switch (mi_type) { + case GSM_MI_TYPE_TMSI: + DEBUGPC(DMM, "\n"); + subscr = subscr_get_by_tmsi(network->subscr_group, + tmsi_from_string(mi_string)); + break; + case GSM_MI_TYPE_IMSI: + DEBUGPC(DMM, "\n"); + subscr = subscr_get_by_imsi(network->subscr_group, + mi_string); + break; + case GSM_MI_TYPE_IMEI: + case GSM_MI_TYPE_IMEISV: + /* no sim card... FIXME: what to do ? */ + DEBUGPC(DMM, ": unimplemented mobile identity type\n"); + break; + default: + DEBUGPC(DMM, ": unknown mobile identity type\n"); + break; + } + + if (subscr) { + subscr_update(subscr, conn->bts, + GSM_SUBSCRIBER_UPDATE_DETACHED); + DEBUGP(DMM, "Subscriber: %s\n", subscr_name(subscr)); + + subscr->equipment.classmark1 = idi->classmark1; + db_sync_equipment(&subscr->equipment); + + subscr_put(subscr); + } else + DEBUGP(DMM, "Unknown Subscriber ?!?\n"); + + /* FIXME: iterate over all transactions and release them, + * imagine an IMSI DETACH happening during an active call! */ + + release_anchor(conn); + return 0; +} + +static int gsm48_rx_mm_status(struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + + DEBUGP(DMM, "MM STATUS (reject cause 0x%02x)\n", gh->data[0]); + + return 0; +} + +static int parse_gsm_auth_resp(uint8_t *res, uint8_t *res_len, + struct gsm_subscriber_connection *conn, + struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + struct gsm48_auth_resp *ar = (struct gsm48_auth_resp*) gh->data; + + if (msgb_l3len(msg) < sizeof(*gh) + sizeof(*ar)) { + LOGP(DMM, LOGL_ERROR, + "%s: MM AUTHENTICATION RESPONSE:" + " l3 length invalid: %u\n", + subscr_name(conn->subscr), msgb_l3len(msg)); + return -EINVAL; + } + + *res_len = sizeof(ar->sres); + memcpy(res, ar->sres, sizeof(ar->sres)); + return 0; +} + +static int parse_umts_auth_resp(uint8_t *res, uint8_t *res_len, + struct gsm_subscriber_connection *conn, + struct msgb *msg) +{ + struct gsm48_hdr *gh; + uint8_t *data; + uint8_t iei; + uint8_t ie_len; + unsigned int data_len; + + /* First parse the GSM part */ + if (parse_gsm_auth_resp(res, res_len, conn, msg)) + return -EINVAL; + OSMO_ASSERT(*res_len == 4); + + /* Then add the extended res part */ + gh = msgb_l3(msg); + data = gh->data + sizeof(struct gsm48_auth_resp); + data_len = msgb_l3len(msg) - (data - (uint8_t*)msgb_l3(msg)); + + if (data_len < 3) { + LOGP(DMM, LOGL_ERROR, + "%s: MM AUTHENTICATION RESPONSE:" + " l3 length invalid: %u\n", + subscr_name(conn->subscr), msgb_l3len(msg)); + return -EINVAL; + } + + iei = data[0]; + ie_len = data[1]; + if (iei != GSM48_IE_AUTH_RES_EXT) { + LOGP(DMM, LOGL_ERROR, + "%s: MM R99 AUTHENTICATION RESPONSE:" + " expected IEI 0x%02x, got 0x%02x\n", + subscr_name(conn->subscr), + GSM48_IE_AUTH_RES_EXT, iei); + return -EINVAL; + } + + if (ie_len > 12) { + LOGP(DMM, LOGL_ERROR, + "%s: MM R99 AUTHENTICATION RESPONSE:" + " extended Auth Resp IE 0x%02x is too large: %u bytes\n", + subscr_name(conn->subscr), GSM48_IE_AUTH_RES_EXT, ie_len); + return -EINVAL; + } + + *res_len += ie_len; + memcpy(res + 4, &data[2], ie_len); + return 0; +} + +/* Chapter 9.2.3: Authentication Response */ +static int gsm48_rx_mm_auth_resp(struct gsm_subscriber_connection *conn, struct msgb *msg) +{ + struct gsm_network *net = conn->network; + uint8_t res[16]; + uint8_t res_len; + int rc; + bool is_r99; + + if (!conn->subscr) { + LOGP(DMM, LOGL_ERROR, + "MM AUTHENTICATION RESPONSE: invalid: no subscriber\n"); + gsm48_tx_mm_auth_rej(conn); + release_security_operation(conn); + return -EINVAL; + } + + if (msgb_l3len(msg) > + sizeof(struct gsm48_hdr) + sizeof(struct gsm48_auth_resp)) { + rc = parse_umts_auth_resp(res, &res_len, conn, msg); + is_r99 = true; + } else { + rc = parse_gsm_auth_resp(res, &res_len, conn, msg); + is_r99 = false; + } + + if (rc) { + gsm48_tx_mm_auth_rej(conn); + release_security_operation(conn); + return -EINVAL; + } + + DEBUGP(DMM, "%s: MM %s AUTHENTICATION RESPONSE (%s = %s)\n", + subscr_name(conn->subscr), + is_r99 ? "R99" : "GSM", is_r99 ? "res" : "sres", + osmo_hexdump_nospc(res, res_len)); + + /* Future: vlr_sub_rx_auth_resp(conn->vsub, is_r99, + * conn->via_ran == RAN_UTRAN_IU, + * res, res_len); + */ + + if (res_len != 4) { + LOGP(DMM, LOGL_ERROR, + "%s: MM AUTHENTICATION RESPONSE:" + " UMTS authentication not supported\n", + subscr_name(conn->subscr)); + } + + /* Safety check */ + if (!conn->sec_operation) { + DEBUGP(DMM, "No authentication/cipher operation in progress !!!\n"); + return -EIO; + } + + /* Validate SRES */ + if (memcmp(conn->sec_operation->atuple.vec.sres, res, 4)) { + int rc; + gsm_cbfn *cb = conn->sec_operation->cb; + + DEBUGPC(DMM, "Invalid (expected %s)\n", + osmo_hexdump(conn->sec_operation->atuple.vec.sres, 4)); + + if (cb) + cb(GSM_HOOK_RR_SECURITY, GSM_SECURITY_AUTH_FAILED, + NULL, conn, conn->sec_operation->cb_data); + + rc = gsm48_tx_mm_auth_rej(conn); + release_security_operation(conn); + return rc; + } + + DEBUGPC(DMM, "OK\n"); + + /* Start ciphering */ + return gsm0808_cipher_mode(conn, net->a5_encryption, + conn->sec_operation->atuple.vec.kc, 8, 0); +} + +static int gsm48_rx_mm_auth_fail(struct gsm_subscriber_connection *conn, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + uint8_t cause; + uint8_t auts_tag; + uint8_t auts_len; + uint8_t *auts; + int rc; + + if (!conn->sec_operation) { + DEBUGP(DMM, "%s: MM R99 AUTHENTICATION FAILURE:" + " No authentication/cipher operation in progress\n", + subscr_name(conn->subscr)); + return -EINVAL; + } + + if (!conn->subscr) { + LOGP(DMM, LOGL_ERROR, + "MM R99 AUTHENTICATION FAILURE: invalid: no subscriber\n"); + gsm48_tx_mm_auth_rej(conn); + release_security_operation(conn); + return -EINVAL; + } + + if (msgb_l3len(msg) < sizeof(*gh) + 1) { + LOGP(DMM, LOGL_ERROR, + "%s: MM R99 AUTHENTICATION FAILURE:" + " l3 length invalid: %u\n", + subscr_name(conn->subscr), msgb_l3len(msg)); + gsm48_tx_mm_auth_rej(conn); + release_security_operation(conn); + return -EINVAL; + } + + cause = gh->data[0]; + + if (cause != GSM48_REJECT_SYNCH_FAILURE) { + LOGP(DMM, LOGL_INFO, + "%s: MM R99 AUTHENTICATION FAILURE: cause 0x%0x\n", + subscr_name(conn->subscr), cause); + rc = gsm48_tx_mm_auth_rej(conn); + release_security_operation(conn); + return rc; + } + + /* This is a Synch Failure procedure, which should pass an AUTS to + * resynchronize the sequence nr with the HLR. Expecting exactly one + * TLV with 14 bytes of AUTS. */ + + if (msgb_l3len(msg) < sizeof(*gh) + 1 + 2) { + LOGP(DMM, LOGL_INFO, + "%s: MM R99 AUTHENTICATION FAILURE:" + " invalid Synch Failure: missing AUTS IE\n", + subscr_name(conn->subscr)); + gsm48_tx_mm_auth_rej(conn); + release_security_operation(conn); + return -EINVAL; + } + + auts_tag = gh->data[1]; + auts_len = gh->data[2]; + auts = &gh->data[3]; + + if (auts_tag != GSM48_IE_AUTS + || auts_len != 14) { + LOGP(DMM, LOGL_INFO, + "%s: MM R99 AUTHENTICATION FAILURE:" + " invalid Synch Failure:" + " expected AUTS IE 0x%02x of 14 bytes," + " got IE 0x%02x of %u bytes\n", + subscr_name(conn->subscr), + GSM48_IE_AUTS, auts_tag, auts_len); + gsm48_tx_mm_auth_rej(conn); + release_security_operation(conn); + return -EINVAL; + } + + if (msgb_l3len(msg) < sizeof(*gh) + 1 + 2 + auts_len) { + LOGP(DMM, LOGL_INFO, + "%s: MM R99 AUTHENTICATION FAILURE:" + " invalid Synch Failure msg: message truncated (%u)\n", + subscr_name(conn->subscr), msgb_l3len(msg)); + gsm48_tx_mm_auth_rej(conn); + release_security_operation(conn); + return -EINVAL; + } + + /* We have an AUTS IE with exactly 14 bytes of AUTS and the msgb is + * large enough. */ + + DEBUGP(DMM, "%s: MM R99 AUTHENTICATION SYNCH (AUTS = %s)\n", + subscr_name(conn->subscr), osmo_hexdump_nospc(auts, 14)); + + /* Future: vlr_sub_rx_auth_fail(conn->vsub, auts); */ + + LOGP(DMM, LOGL_ERROR, "%s: MM R99 AUTHENTICATION not supported\n", + subscr_name(conn->subscr)); + rc = gsm48_tx_mm_auth_rej(conn); + release_security_operation(conn); + return rc; +} + +/* Receive a GSM 04.08 Mobility Management (MM) message */ +static int gsm0408_rcv_mm(struct gsm_subscriber_connection *conn, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + int rc = 0; + + switch (gsm48_hdr_msg_type(gh)) { + case GSM48_MT_MM_LOC_UPD_REQUEST: + DEBUGP(DMM, "LOCATION UPDATING REQUEST: "); + rc = mm_rx_loc_upd_req(conn, msg); + break; + case GSM48_MT_MM_ID_RESP: + rc = mm_rx_id_resp(conn, msg); + break; + case GSM48_MT_MM_CM_SERV_REQ: + rc = gsm48_rx_mm_serv_req(conn, msg); + break; + case GSM48_MT_MM_STATUS: + rc = gsm48_rx_mm_status(msg); + break; + case GSM48_MT_MM_TMSI_REALL_COMPL: + DEBUGP(DMM, "TMSI Reallocation Completed. Subscriber: %s\n", + subscr_name(conn->subscr)); + loc_updating_success(conn, 1); + break; + case GSM48_MT_MM_IMSI_DETACH_IND: + rc = gsm48_rx_mm_imsi_detach_ind(conn, msg); + break; + case GSM48_MT_MM_CM_REEST_REQ: + DEBUGP(DMM, "CM REESTABLISH REQUEST: Not implemented\n"); + break; + case GSM48_MT_MM_AUTH_RESP: + rc = gsm48_rx_mm_auth_resp(conn, msg); + break; + case GSM48_MT_MM_AUTH_FAIL: + rc = gsm48_rx_mm_auth_fail(conn, msg); + break; + default: + LOGP(DMM, LOGL_NOTICE, "Unknown GSM 04.08 MM msg type 0x%02x\n", + gh->msg_type); + break; + } + + return rc; +} + +/* Receive a PAGING RESPONSE message from the MS */ +static int gsm48_rx_rr_pag_resp(struct gsm_subscriber_connection *conn, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + struct gsm48_pag_resp *resp; + uint8_t *classmark2_lv = gh->data + 1; + uint8_t mi_type; + char mi_string[GSM48_MI_SIZE]; + struct gsm_subscriber *subscr = NULL; + struct bsc_subscr *bsub; + uint32_t tmsi; + int rc = 0; + + resp = (struct gsm48_pag_resp *) &gh->data[0]; + gsm48_paging_extract_mi(resp, msgb_l3len(msg) - sizeof(*gh), + mi_string, &mi_type); + DEBUGP(DRR, "PAGING RESPONSE: MI(%s)=%s\n", + gsm48_mi_type_name(mi_type), mi_string); + + switch (mi_type) { + case GSM_MI_TYPE_TMSI: + tmsi = tmsi_from_string(mi_string); + subscr = subscr_get_by_tmsi(conn->network->subscr_group, tmsi); + break; + case GSM_MI_TYPE_IMSI: + subscr = subscr_get_by_imsi(conn->network->subscr_group, + mi_string); + break; + } + + if (!subscr) { + DEBUGP(DRR, "<- Can't find any subscriber for this ID\n"); + /* FIXME: request id? close channel? */ + return -EINVAL; + } + + if (!conn->subscr) { + conn->subscr = subscr; + } else if (conn->subscr != subscr) { + LOGP(DRR, LOGL_ERROR, "<- Channel already owned by someone else?\n"); + subscr_put(subscr); + return -EINVAL; + } else { + DEBUGP(DRR, "<- Channel already owned by us\n"); + subscr_put(subscr); + subscr = conn->subscr; + } + + log_set_context(LOG_CTX_VLR_SUBSCR, subscr); + DEBUGP(DRR, "<- Channel was requested by %s\n", + subscr->name && strlen(subscr->name) ? subscr->name : subscr->imsi); + + subscr->equipment.classmark2_len = *classmark2_lv; + memcpy(subscr->equipment.classmark2, classmark2_lv+1, *classmark2_lv); + db_sync_equipment(&subscr->equipment); + + /* TODO MSC split -- creating a BSC subscriber directly from MSC data + * structures in RAM. At some point the MSC will send a message to the + * BSC instead. */ + bsub = bsc_subscr_find_or_create_by_imsi(conn->network->bsc_subscribers, + subscr->imsi); + bsub->tmsi = subscr->tmsi; + bsub->lac = subscr->lac; + + /* We received a paging */ + conn->expire_timer_stopped = 1; + + rc = gsm48_handle_paging_resp(conn, msg, bsub); + return rc; +} + +static int gsm48_rx_rr_app_info(struct gsm_subscriber_connection *conn, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + uint8_t apdu_id_flags; + uint8_t apdu_len; + uint8_t *apdu_data; + + apdu_id_flags = gh->data[0]; + apdu_len = gh->data[1]; + apdu_data = gh->data+2; + + DEBUGP(DRR, "RX APPLICATION INFO id/flags=0x%02x apdu_len=%u apdu=%s\n", + apdu_id_flags, apdu_len, osmo_hexdump(apdu_data, apdu_len)); + + return db_apdu_blob_store(conn->subscr, apdu_id_flags, apdu_len, apdu_data); +} + +/* Receive a GSM 04.08 Radio Resource (RR) message */ +static int gsm0408_rcv_rr(struct gsm_subscriber_connection *conn, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + int rc = 0; + + switch (gh->msg_type) { + case GSM48_MT_RR_PAG_RESP: + rc = gsm48_rx_rr_pag_resp(conn, msg); + break; + case GSM48_MT_RR_APP_INFO: + rc = gsm48_rx_rr_app_info(conn, msg); + break; + default: + LOGP(DRR, LOGL_NOTICE, "MSC: Unimplemented %s GSM 04.08 RR " + "message\n", gsm48_rr_msg_name(gh->msg_type)); + break; + } + + return rc; +} + +int gsm48_send_rr_app_info(struct gsm_subscriber_connection *conn, uint8_t apdu_id, + uint8_t apdu_len, const uint8_t *apdu) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 APP INF"); + struct gsm48_hdr *gh; + + msg->lchan = conn->lchan; + + DEBUGP(DRR, "TX APPLICATION INFO id=0x%02x, len=%u\n", + apdu_id, apdu_len); + + gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 2 + apdu_len); + gh->proto_discr = GSM48_PDISC_RR; + gh->msg_type = GSM48_MT_RR_APP_INFO; + gh->data[0] = apdu_id; + gh->data[1] = apdu_len; + memcpy(gh->data+2, apdu, apdu_len); + + return gsm48_conn_sendmsg(msg, conn, NULL); +} + +/* FIXME: this count_statistics is a state machine behaviour. we should convert + * the complete call control into a state machine. Afterwards we can move this + * code into state transitions. + */ +static void count_statistics(struct gsm_trans *trans, int new_state) +{ + int old_state = trans->cc.state; + struct rate_ctr_group *msc = trans->net->msc_ctrs; + + if (old_state == new_state) + return; + + /* state incoming */ + switch (new_state) { + case GSM_CSTATE_ACTIVE: + osmo_counter_inc(trans->net->active_calls); + rate_ctr_inc(&msc->ctr[MSC_CTR_CALL_ACTIVE]); + break; + } + + /* state outgoing */ + switch (old_state) { + case GSM_CSTATE_ACTIVE: + osmo_counter_dec(trans->net->active_calls); + if (new_state == GSM_CSTATE_DISCONNECT_REQ || + new_state == GSM_CSTATE_DISCONNECT_IND) + rate_ctr_inc(&msc->ctr[MSC_CTR_CALL_COMPLETE]); + else + rate_ctr_inc(&msc->ctr[MSC_CTR_CALL_INCOMPLETE]); + break; + } +} + +/* Call Control */ + +/* The entire call control code is written in accordance with Figure 7.10c + * for 'very early assignment', i.e. we allocate a TCH/F during IMMEDIATE + * ASSIGN, then first use that TCH/F for signalling and later MODE MODIFY + * it for voice */ + +static void new_cc_state(struct gsm_trans *trans, int state) +{ + if (state > 31 || state < 0) + return; + + DEBUGP(DCC, "new state %s -> %s\n", + gsm48_cc_state_name(trans->cc.state), + gsm48_cc_state_name(state)); + + count_statistics(trans, state); + trans->cc.state = state; +} + +static int gsm48_cc_tx_status(struct gsm_trans *trans, void *arg) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC STATUS"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + uint8_t *cause, *call_state; + + gh->msg_type = GSM48_MT_CC_STATUS; + + cause = msgb_put(msg, 3); + cause[0] = 2; + cause[1] = GSM48_CAUSE_CS_GSM | GSM48_CAUSE_LOC_USER; + cause[2] = 0x80 | 30; /* response to status inquiry */ + + call_state = msgb_put(msg, 1); + call_state[0] = 0xc0 | 0x00; + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_tx_simple(struct gsm_subscriber_connection *conn, + uint8_t pdisc, uint8_t msg_type) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 TX SIMPLE"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + msg->lchan = conn->lchan; + + gh->proto_discr = pdisc; + gh->msg_type = msg_type; + + return gsm48_conn_sendmsg(msg, conn, NULL); +} + +static void gsm48_stop_cc_timer(struct gsm_trans *trans) +{ + if (osmo_timer_pending(&trans->cc.timer)) { + DEBUGP(DCC, "stopping pending timer T%x\n", trans->cc.Tcurrent); + osmo_timer_del(&trans->cc.timer); + trans->cc.Tcurrent = 0; + } +} + +static int mncc_recvmsg(struct gsm_network *net, struct gsm_trans *trans, + int msg_type, struct gsm_mncc *mncc) +{ + struct msgb *msg; + unsigned char *data; + + if (trans) + if (trans->conn && trans->conn->lchan) + DEBUGP(DCC, "(bts %d trx %d ts %d ti %x sub %s) " + "Sending '%s' to MNCC.\n", + trans->conn->lchan->ts->trx->bts->nr, + trans->conn->lchan->ts->trx->nr, + trans->conn->lchan->ts->nr, trans->transaction_id, + (trans->subscr)?(trans->subscr->extension):"-", + get_mncc_name(msg_type)); + else + DEBUGP(DCC, "(bts - trx - ts - ti -- sub %s) " + "Sending '%s' to MNCC.\n", + (trans->subscr)?(trans->subscr->extension):"-", + get_mncc_name(msg_type)); + else + DEBUGP(DCC, "(bts - trx - ts - ti -- sub -) " + "Sending '%s' to MNCC.\n", get_mncc_name(msg_type)); + + mncc->msg_type = msg_type; + + msg = msgb_alloc(sizeof(struct gsm_mncc), "MNCC"); + if (!msg) + return -ENOMEM; + + data = msgb_put(msg, sizeof(struct gsm_mncc)); + memcpy(data, mncc, sizeof(struct gsm_mncc)); + + cc_tx_to_mncc(net, msg); + + return 0; +} + +int mncc_release_ind(struct gsm_network *net, struct gsm_trans *trans, + uint32_t callref, int location, int value) +{ + struct gsm_mncc rel; + + memset(&rel, 0, sizeof(rel)); + rel.callref = callref; + mncc_set_cause(&rel, location, value); + if (trans && trans->cc.state == GSM_CSTATE_RELEASE_REQ) + return mncc_recvmsg(net, trans, MNCC_REL_CNF, &rel); + return mncc_recvmsg(net, trans, MNCC_REL_IND, &rel); +} + +/* Call Control Specific transaction release. + * gets called by trans_free, DO NOT CALL YOURSELF! */ +void _gsm48_cc_trans_free(struct gsm_trans *trans) +{ + gsm48_stop_cc_timer(trans); + + /* send release to L4, if callref still exists */ + if (trans->callref) { + /* Ressource unavailable */ + mncc_release_ind(trans->net, trans, trans->callref, + GSM48_CAUSE_LOC_PRN_S_LU, + GSM48_CC_CAUSE_RESOURCE_UNAVAIL); + } + if (trans->cc.state != GSM_CSTATE_NULL) + new_cc_state(trans, GSM_CSTATE_NULL); + if (trans->conn) + trau_mux_unmap(&trans->conn->lchan->ts->e1_link, trans->callref); +} + +static int gsm48_cc_tx_setup(struct gsm_trans *trans, void *arg); + +/* call-back from paging the B-end of the connection */ +static int setup_trig_pag_evt(unsigned int hooknum, unsigned int event, + struct msgb *msg, void *_conn, void *_transt) +{ + struct gsm_subscriber_connection *conn = _conn; + struct gsm_trans *transt = _transt; + + OSMO_ASSERT(!transt->conn); + + /* check all tranactions (without lchan) for subscriber */ + switch (event) { + case GSM_PAGING_SUCCEEDED: + DEBUGP(DCC, "Paging subscr %s succeeded!\n", transt->subscr->extension); + OSMO_ASSERT(conn); + /* Assign lchan */ + transt->conn = conn; + /* send SETUP request to called party */ + gsm48_cc_tx_setup(transt, &transt->cc.msg); + break; + case GSM_PAGING_EXPIRED: + case GSM_PAGING_BUSY: + DEBUGP(DCC, "Paging subscr %s expired!\n", + transt->subscr->extension); + /* Temporarily out of order */ + mncc_release_ind(transt->net, transt, + transt->callref, + GSM48_CAUSE_LOC_PRN_S_LU, + GSM48_CC_CAUSE_DEST_OOO); + transt->callref = 0; + transt->paging_request = NULL; + trans_free(transt); + break; + default: + LOGP(DCC, LOGL_ERROR, "Unknown paging event %d\n", event); + break; + } + + transt->paging_request = NULL; + return 0; +} + +static int tch_recv_mncc(struct gsm_network *net, uint32_t callref, int enable); + +/* handle audio path for handover */ +static int switch_for_handover(struct gsm_lchan *old_lchan, + struct gsm_lchan *new_lchan) +{ + struct rtp_socket *old_rs, *new_rs, *other_rs; + + /* Ask the new socket to send to the already known port. */ + if (new_lchan->conn->mncc_rtp_bridge) { + LOGP(DHO, LOGL_DEBUG, "Forwarding RTP\n"); + rsl_ipacc_mdcx(new_lchan, + old_lchan->abis_ip.connect_ip, + old_lchan->abis_ip.connect_port, 0); + return 0; + } + + if (ipacc_rtp_direct) { + LOGP(DHO, LOGL_ERROR, "unable to handover in direct RTP mode\n"); + return 0; + } + + /* RTP Proxy mode */ + new_rs = new_lchan->abis_ip.rtp_socket; + old_rs = old_lchan->abis_ip.rtp_socket; + + if (!new_rs) { + LOGP(DHO, LOGL_ERROR, "no RTP socket for new_lchan\n"); + return -EIO; + } + + rsl_ipacc_mdcx_to_rtpsock(new_lchan); + + if (!old_rs) { + LOGP(DHO, LOGL_ERROR, "no RTP socket for old_lchan\n"); + return -EIO; + } + + /* copy rx_action and reference to other sock */ + new_rs->rx_action = old_rs->rx_action; + new_rs->tx_action = old_rs->tx_action; + new_rs->transmit = old_rs->transmit; + + switch (old_lchan->abis_ip.rtp_socket->rx_action) { + case RTP_PROXY: + other_rs = old_rs->proxy.other_sock; + rtp_socket_proxy(new_rs, other_rs); + /* delete reference to other end socket to prevent + * rtp_socket_free() from removing the inverse reference */ + old_rs->proxy.other_sock = NULL; + break; + case RTP_RECV_UPSTREAM: + new_rs->receive = old_rs->receive; + break; + case RTP_NONE: + break; + } + + return 0; +} + +static void maybe_switch_for_handover(struct gsm_lchan *lchan) +{ + struct gsm_lchan *old_lchan; + old_lchan = bsc_handover_pending(lchan); + if (old_lchan) + switch_for_handover(old_lchan, lchan); +} + +/* some other part of the code sends us a signal */ +static int handle_abisip_signal(unsigned int subsys, unsigned int signal, + void *handler_data, void *signal_data) +{ + struct gsm_lchan *lchan = signal_data; + int rc; + struct gsm_network *net; + struct gsm_trans *trans; + + if (subsys != SS_ABISIP) + return 0; + + /* RTP bridge handling */ + if (lchan->conn && lchan->conn->mncc_rtp_bridge) + return tch_rtp_signal(lchan, signal); + + /* in case we use direct BTS-to-BTS RTP */ + if (ipacc_rtp_direct) + return 0; + + switch (signal) { + case S_ABISIP_CRCX_ACK: + /* in case we don't use direct BTS-to-BTS RTP */ + /* the BTS has successfully bound a TCH to a local ip/port, + * which means we can connect our UDP socket to it */ + if (lchan->abis_ip.rtp_socket) { + rtp_socket_free(lchan->abis_ip.rtp_socket); + lchan->abis_ip.rtp_socket = NULL; + } + + lchan->abis_ip.rtp_socket = rtp_socket_create(); + if (!lchan->abis_ip.rtp_socket) + return -EIO; + + rc = rtp_socket_connect(lchan->abis_ip.rtp_socket, + lchan->abis_ip.bound_ip, + lchan->abis_ip.bound_port); + if (rc < 0) + return -EIO; + + /* check if any transactions on this lchan still have + * a tch_recv_mncc request pending */ + net = lchan->ts->trx->bts->network; + llist_for_each_entry(trans, &net->trans_list, entry) { + if (trans->conn && trans->conn->lchan == lchan && trans->tch_recv) { + DEBUGP(DCC, "pending tch_recv_mncc request\n"); + tch_recv_mncc(net, trans->callref, 1); + } + } + + /* + * TODO: this appears to be too early? Why not until after + * the handover detect or the handover complete? + * + * Do we have a handover pending for this new lchan? In that + * case re-route the audio from the old channel to the new one. + */ + maybe_switch_for_handover(lchan); + break; + case S_ABISIP_DLCX_IND: + /* the BTS tells us a RTP stream has been disconnected */ + if (lchan->abis_ip.rtp_socket) { + rtp_socket_free(lchan->abis_ip.rtp_socket); + lchan->abis_ip.rtp_socket = NULL; + } + + break; + } + + return 0; +} + +/* map two ipaccess RTP streams onto each other */ +static int tch_map(struct gsm_lchan *lchan, struct gsm_lchan *remote_lchan) +{ + struct gsm_bts *bts = lchan->ts->trx->bts; + struct gsm_bts *remote_bts = remote_lchan->ts->trx->bts; + enum gsm_chan_t lt = lchan->type, rt = remote_lchan->type; + enum gsm48_chan_mode lm = lchan->tch_mode, rm = remote_lchan->tch_mode; + int rc; + + DEBUGP(DCC, "Setting up TCH map between (bts=%u,trx=%u,ts=%u,%s) and " + "(bts=%u,trx=%u,ts=%u,%s)\n", + bts->nr, lchan->ts->trx->nr, lchan->ts->nr, + get_value_string(gsm_chan_t_names, lt), + remote_bts->nr, remote_lchan->ts->trx->nr, remote_lchan->ts->nr, + get_value_string(gsm_chan_t_names, rt)); + + if (bts->type != remote_bts->type) { + LOGP(DCC, LOGL_ERROR, "Cannot switch calls between different BTS types yet\n"); + return -EINVAL; + } + + if (lt != rt) { + LOGP(DCC, LOGL_ERROR, "Cannot patch through call with different" + " channel types: local = %s, remote = %s\n", + get_value_string(gsm_chan_t_names, lt), + get_value_string(gsm_chan_t_names, rt)); + return -EBADSLT; + } + + if (lm != rm) { + LOGP(DCC, LOGL_ERROR, "Cannot patch through call with different" + " channel modes: local = %s, remote = %s\n", + get_value_string(gsm48_chan_mode_names, lm), + get_value_string(gsm48_chan_mode_names, rm)); + return -EMEDIUMTYPE; + } + + // todo: map between different bts types + switch (bts->type) { + case GSM_BTS_TYPE_NANOBTS: + case GSM_BTS_TYPE_OSMOBTS: + if (!ipacc_rtp_direct) { + if (!lchan->abis_ip.rtp_socket) { + LOGP(DHO, LOGL_ERROR, "no RTP socket for " + "lchan\n"); + return -EIO; + } + if (!remote_lchan->abis_ip.rtp_socket) { + LOGP(DHO, LOGL_ERROR, "no RTP socket for " + "remote_lchan\n"); + return -EIO; + } + + /* connect the TCH's to our RTP proxy */ + rc = rsl_ipacc_mdcx_to_rtpsock(lchan); + if (rc < 0) + return rc; + rc = rsl_ipacc_mdcx_to_rtpsock(remote_lchan); + if (rc < 0) + return rc; + /* connect them with each other */ + rtp_socket_proxy(lchan->abis_ip.rtp_socket, + remote_lchan->abis_ip.rtp_socket); + } else { + /* directly connect TCH RTP streams to each other */ + rc = rsl_ipacc_mdcx(lchan, remote_lchan->abis_ip.bound_ip, + remote_lchan->abis_ip.bound_port, + remote_lchan->abis_ip.rtp_payload2); + if (rc < 0) + return rc; + rc = rsl_ipacc_mdcx(remote_lchan, lchan->abis_ip.bound_ip, + lchan->abis_ip.bound_port, + lchan->abis_ip.rtp_payload2); + } + break; + case GSM_BTS_TYPE_BS11: + case GSM_BTS_TYPE_RBS2000: + case GSM_BTS_TYPE_NOKIA_SITE: + trau_mux_map_lchan(lchan, remote_lchan); + break; + default: + LOGP(DCC, LOGL_ERROR, "Unknown BTS type %u\n", bts->type); + return -EINVAL; + } + + return 0; +} + +/* bridge channels of two transactions */ +static int tch_bridge(struct gsm_network *net, struct gsm_mncc_bridge *bridge) +{ + struct gsm_trans *trans1 = trans_find_by_callref(net, bridge->callref[0]); + struct gsm_trans *trans2 = trans_find_by_callref(net, bridge->callref[1]); + + if (!trans1 || !trans2) + return -EIO; + + if (!trans1->conn || !trans2->conn) + return -EIO; + + /* Which subscriber do we want to track trans1 or trans2? */ + log_set_context(LOG_CTX_VLR_SUBSCR, trans1->subscr); + + /* through-connect channel */ + return tch_map(trans1->conn->lchan, trans2->conn->lchan); +} + +/* enable receive of channels to MNCC upqueue */ +static int tch_recv_mncc(struct gsm_network *net, uint32_t callref, int enable) +{ + struct gsm_trans *trans; + struct gsm_lchan *lchan; + struct gsm_bts *bts; + int rc; + + /* Find callref */ + trans = trans_find_by_callref(net, callref); + if (!trans) + return -EIO; + if (!trans->conn) + return 0; + + log_set_context(LOG_CTX_VLR_SUBSCR, trans->subscr); + lchan = trans->conn->lchan; + bts = lchan->ts->trx->bts; + + /* store receive state */ + trans->tch_recv = enable; + + switch (bts->type) { + case GSM_BTS_TYPE_NANOBTS: + case GSM_BTS_TYPE_OSMOBTS: + if (ipacc_rtp_direct) { + LOGP(DCC, LOGL_ERROR, "Error: RTP proxy is disabled\n"); + return -EINVAL; + } + /* In case, we don't have a RTP socket to the BTS yet, the BTS + * will not be connected to our RTP proxy and the socket will + * not be assigned to the application interface. This method + * will be called again, once the audio socket is created and + * connected. */ + if (!lchan->abis_ip.rtp_socket) { + DEBUGP(DCC, "queue tch_recv_mncc request (%d)\n", enable); + return 0; + } + if (enable) { + /* connect the TCH's to our RTP proxy */ + rc = rsl_ipacc_mdcx_to_rtpsock(lchan); + if (rc < 0) + return rc; + /* assign socket to application interface */ + rtp_socket_upstream(lchan->abis_ip.rtp_socket, + net, callref); + } else + rtp_socket_upstream(lchan->abis_ip.rtp_socket, + net, 0); + break; + case GSM_BTS_TYPE_BS11: + case GSM_BTS_TYPE_RBS2000: + case GSM_BTS_TYPE_NOKIA_SITE: + /* In case we don't have a TCH with correct mode, the TRAU muxer + * will not be asigned to the application interface. This is + * performed by switch_trau_mux() after successful handover or + * assignment. */ + if (lchan->tch_mode == GSM48_CMODE_SIGN) { + DEBUGP(DCC, "queue tch_recv_mncc request (%d)\n", enable); + return 0; + } + if (enable) + return trau_recv_lchan(lchan, callref); + return trau_mux_unmap(NULL, callref); + break; + default: + LOGP(DCC, LOGL_ERROR, "Unknown BTS type %u\n", bts->type); + return -EINVAL; + } + + return 0; +} + +static int gsm48_cc_rx_status_enq(struct gsm_trans *trans, struct msgb *msg) +{ + DEBUGP(DCC, "-> STATUS ENQ\n"); + return gsm48_cc_tx_status(trans, msg); +} + +static int gsm48_cc_tx_release(struct gsm_trans *trans, void *arg); +static int gsm48_cc_tx_disconnect(struct gsm_trans *trans, void *arg); + +static void gsm48_cc_timeout(void *arg) +{ + struct gsm_trans *trans = arg; + int disconnect = 0, release = 0; + int mo_cause = GSM48_CC_CAUSE_RECOVERY_TIMER; + int mo_location = GSM48_CAUSE_LOC_USER; + int l4_cause = GSM48_CC_CAUSE_NORMAL_UNSPEC; + int l4_location = GSM48_CAUSE_LOC_PRN_S_LU; + struct gsm_mncc mo_rel, l4_rel; + + memset(&mo_rel, 0, sizeof(struct gsm_mncc)); + mo_rel.callref = trans->callref; + memset(&l4_rel, 0, sizeof(struct gsm_mncc)); + l4_rel.callref = trans->callref; + + switch(trans->cc.Tcurrent) { + case 0x303: + release = 1; + l4_cause = GSM48_CC_CAUSE_USER_NOTRESPOND; + break; + case 0x310: + disconnect = 1; + l4_cause = GSM48_CC_CAUSE_USER_NOTRESPOND; + break; + case 0x313: + disconnect = 1; + /* unknown, did not find it in the specs */ + break; + case 0x301: + disconnect = 1; + l4_cause = GSM48_CC_CAUSE_USER_NOTRESPOND; + break; + case 0x308: + if (!trans->cc.T308_second) { + /* restart T308 a second time */ + gsm48_cc_tx_release(trans, &trans->cc.msg); + trans->cc.T308_second = 1; + break; /* stay in release state */ + } + trans_free(trans); + return; +// release = 1; +// l4_cause = 14; +// break; + case 0x306: + release = 1; + mo_cause = trans->cc.msg.cause.value; + mo_location = trans->cc.msg.cause.location; + break; + case 0x323: + disconnect = 1; + break; + default: + release = 1; + } + + if (release && trans->callref) { + /* process release towards layer 4 */ + mncc_release_ind(trans->net, trans, trans->callref, + l4_location, l4_cause); + trans->callref = 0; + } + + if (disconnect && trans->callref) { + /* process disconnect towards layer 4 */ + mncc_set_cause(&l4_rel, l4_location, l4_cause); + mncc_recvmsg(trans->net, trans, MNCC_DISC_IND, &l4_rel); + } + + /* process disconnect towards mobile station */ + if (disconnect || release) { + mncc_set_cause(&mo_rel, mo_location, mo_cause); + mo_rel.cause.diag[0] = ((trans->cc.Tcurrent & 0xf00) >> 8) + '0'; + mo_rel.cause.diag[1] = ((trans->cc.Tcurrent & 0x0f0) >> 4) + '0'; + mo_rel.cause.diag[2] = (trans->cc.Tcurrent & 0x00f) + '0'; + mo_rel.cause.diag_len = 3; + + if (disconnect) + gsm48_cc_tx_disconnect(trans, &mo_rel); + if (release) + gsm48_cc_tx_release(trans, &mo_rel); + } + +} + +/* disconnect both calls from the bridge */ +static inline void disconnect_bridge(struct gsm_network *net, + struct gsm_mncc_bridge *bridge, int err) +{ + struct gsm_trans *trans0 = trans_find_by_callref(net, bridge->callref[0]); + struct gsm_trans *trans1 = trans_find_by_callref(net, bridge->callref[1]); + struct gsm_mncc mx_rel; + if (!trans0 || !trans1) + return; + + DEBUGP(DCC, "Failed to bridge TCH for calls %x <-> %x :: %s \n", + trans0->callref, trans1->callref, strerror(err)); + + memset(&mx_rel, 0, sizeof(struct gsm_mncc)); + mncc_set_cause(&mx_rel, GSM48_CAUSE_LOC_INN_NET, + GSM48_CC_CAUSE_CHAN_UNACCEPT); + + mx_rel.callref = trans0->callref; + gsm48_cc_tx_disconnect(trans0, &mx_rel); + + mx_rel.callref = trans1->callref; + gsm48_cc_tx_disconnect(trans1, &mx_rel); +} + +static void gsm48_start_cc_timer(struct gsm_trans *trans, int current, + int sec, int micro) +{ + DEBUGP(DCC, "starting timer T%x with %d seconds\n", current, sec); + osmo_timer_setup(&trans->cc.timer, gsm48_cc_timeout, trans); + osmo_timer_schedule(&trans->cc.timer, sec, micro); + trans->cc.Tcurrent = current; +} + +static int gsm48_cc_rx_setup(struct gsm_trans *trans, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + uint8_t msg_type = gsm48_hdr_msg_type(gh); + unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); + struct tlv_parsed tp; + struct gsm_mncc setup; + + memset(&setup, 0, sizeof(struct gsm_mncc)); + setup.callref = trans->callref; + setup.lchan_type = trans->conn->lchan->type; + tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0); + /* emergency setup is identified by msg_type */ + if (msg_type == GSM48_MT_CC_EMERG_SETUP) + setup.emergency = 1; + + /* use subscriber as calling party number */ + setup.fields |= MNCC_F_CALLING; + osmo_strlcpy(setup.calling.number, trans->subscr->extension, + sizeof(setup.calling.number)); + osmo_strlcpy(setup.imsi, trans->subscr->imsi, sizeof(setup.imsi)); + + /* bearer capability */ + if (TLVP_PRESENT(&tp, GSM48_IE_BEARER_CAP)) { + setup.fields |= MNCC_F_BEARER_CAP; + gsm48_decode_bearer_cap(&setup.bearer_cap, + TLVP_VAL(&tp, GSM48_IE_BEARER_CAP)-1); + apply_codec_restrictions(trans->conn->bts, &setup.bearer_cap); + } + /* facility */ + if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) { + setup.fields |= MNCC_F_FACILITY; + gsm48_decode_facility(&setup.facility, + TLVP_VAL(&tp, GSM48_IE_FACILITY)-1); + } + /* called party bcd number */ + if (TLVP_PRESENT(&tp, GSM48_IE_CALLED_BCD)) { + setup.fields |= MNCC_F_CALLED; + gsm48_decode_called(&setup.called, + TLVP_VAL(&tp, GSM48_IE_CALLED_BCD)-1); + } + /* user-user */ + if (TLVP_PRESENT(&tp, GSM48_IE_USER_USER)) { + setup.fields |= MNCC_F_USERUSER; + gsm48_decode_useruser(&setup.useruser, + TLVP_VAL(&tp, GSM48_IE_USER_USER)-1); + } + /* ss-version */ + if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) { + setup.fields |= MNCC_F_SSVERSION; + gsm48_decode_ssversion(&setup.ssversion, + TLVP_VAL(&tp, GSM48_IE_SS_VERS)-1); + } + /* CLIR suppression */ + if (TLVP_PRESENT(&tp, GSM48_IE_CLIR_SUPP)) + setup.clir.sup = 1; + /* CLIR invocation */ + if (TLVP_PRESENT(&tp, GSM48_IE_CLIR_INVOC)) + setup.clir.inv = 1; + /* cc cap */ + if (TLVP_PRESENT(&tp, GSM48_IE_CC_CAP)) { + setup.fields |= MNCC_F_CCCAP; + gsm48_decode_cccap(&setup.cccap, + TLVP_VAL(&tp, GSM48_IE_CC_CAP)-1); + } + + new_cc_state(trans, GSM_CSTATE_INITIATED); + + LOGP(DCC, LOGL_INFO, "Subscriber %s (%s) sends SETUP to %s\n", + subscr_name(trans->subscr), trans->subscr->extension, + setup.called.number); + + rate_ctr_inc(&trans->net->msc_ctrs->ctr[MSC_CTR_CALL_MO_SETUP]); + + /* indicate setup to MNCC */ + mncc_recvmsg(trans->net, trans, MNCC_SETUP_IND, &setup); + + /* MNCC code will modify the channel asynchronously, we should + * ipaccess-bind only after the modification has been made to the + * lchan->tch_mode */ + return 0; +} + +static int gsm48_cc_tx_setup(struct gsm_trans *trans, void *arg) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC STUP"); + struct gsm48_hdr *gh; + struct gsm_mncc *setup = arg; + int rc, trans_id; + + gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + /* transaction id must not be assigned */ + if (trans->transaction_id != 0xff) { /* unasssigned */ + DEBUGP(DCC, "TX Setup with assigned transaction. " + "This is not allowed!\n"); + /* Temporarily out of order */ + rc = mncc_release_ind(trans->net, trans, trans->callref, + GSM48_CAUSE_LOC_PRN_S_LU, + GSM48_CC_CAUSE_RESOURCE_UNAVAIL); + trans->callref = 0; + trans_free(trans); + return rc; + } + + /* Get free transaction_id */ + trans_id = trans_assign_trans_id(trans->net, trans->subscr, + GSM48_PDISC_CC, 0); + if (trans_id < 0) { + /* no free transaction ID */ + rc = mncc_release_ind(trans->net, trans, trans->callref, + GSM48_CAUSE_LOC_PRN_S_LU, + GSM48_CC_CAUSE_RESOURCE_UNAVAIL); + trans->callref = 0; + trans_free(trans); + return rc; + } + trans->transaction_id = trans_id; + + gh->msg_type = GSM48_MT_CC_SETUP; + + gsm48_start_cc_timer(trans, 0x303, GSM48_T303); + + /* bearer capability */ + if (setup->fields & MNCC_F_BEARER_CAP) + gsm48_encode_bearer_cap(msg, 0, &setup->bearer_cap); + /* facility */ + if (setup->fields & MNCC_F_FACILITY) + gsm48_encode_facility(msg, 0, &setup->facility); + /* progress */ + if (setup->fields & MNCC_F_PROGRESS) + gsm48_encode_progress(msg, 0, &setup->progress); + /* calling party BCD number */ + if (setup->fields & MNCC_F_CALLING) + gsm48_encode_calling(msg, &setup->calling); + /* called party BCD number */ + if (setup->fields & MNCC_F_CALLED) + gsm48_encode_called(msg, &setup->called); + /* user-user */ + if (setup->fields & MNCC_F_USERUSER) + gsm48_encode_useruser(msg, 0, &setup->useruser); + /* redirecting party BCD number */ + if (setup->fields & MNCC_F_REDIRECTING) + gsm48_encode_redirecting(msg, &setup->redirecting); + /* signal */ + if (setup->fields & MNCC_F_SIGNAL) + gsm48_encode_signal(msg, setup->signal); + + new_cc_state(trans, GSM_CSTATE_CALL_PRESENT); + + rate_ctr_inc(&trans->net->msc_ctrs->ctr[MSC_CTR_CALL_MT_SETUP]); + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_cc_rx_call_conf(struct gsm_trans *trans, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); + struct tlv_parsed tp; + struct gsm_mncc call_conf; + + gsm48_stop_cc_timer(trans); + gsm48_start_cc_timer(trans, 0x310, GSM48_T310); + + memset(&call_conf, 0, sizeof(struct gsm_mncc)); + call_conf.callref = trans->callref; + call_conf.lchan_type = trans->conn->lchan->type; + tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0); +#if 0 + /* repeat */ + if (TLVP_PRESENT(&tp, GSM48_IE_REPEAT_CIR)) + call_conf.repeat = 1; + if (TLVP_PRESENT(&tp, GSM48_IE_REPEAT_SEQ)) + call_conf.repeat = 2; +#endif + /* bearer capability */ + if (TLVP_PRESENT(&tp, GSM48_IE_BEARER_CAP)) { + call_conf.fields |= MNCC_F_BEARER_CAP; + gsm48_decode_bearer_cap(&call_conf.bearer_cap, + TLVP_VAL(&tp, GSM48_IE_BEARER_CAP)-1); + apply_codec_restrictions(trans->conn->bts, &call_conf.bearer_cap); + } + /* cause */ + if (TLVP_PRESENT(&tp, GSM48_IE_CAUSE)) { + call_conf.fields |= MNCC_F_CAUSE; + gsm48_decode_cause(&call_conf.cause, + TLVP_VAL(&tp, GSM48_IE_CAUSE)-1); + } + /* cc cap */ + if (TLVP_PRESENT(&tp, GSM48_IE_CC_CAP)) { + call_conf.fields |= MNCC_F_CCCAP; + gsm48_decode_cccap(&call_conf.cccap, + TLVP_VAL(&tp, GSM48_IE_CC_CAP)-1); + } + + /* IMSI of called subscriber */ + osmo_strlcpy(call_conf.imsi, trans->subscr->imsi, + sizeof(call_conf.imsi)); + + new_cc_state(trans, GSM_CSTATE_MO_TERM_CALL_CONF); + + return mncc_recvmsg(trans->net, trans, MNCC_CALL_CONF_IND, + &call_conf); +} + +static int gsm48_cc_tx_call_proc(struct gsm_trans *trans, void *arg) +{ + struct gsm_mncc *proceeding = arg; + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC PROC"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + gh->msg_type = GSM48_MT_CC_CALL_PROC; + + new_cc_state(trans, GSM_CSTATE_MO_CALL_PROC); + + /* bearer capability */ + if (proceeding->fields & MNCC_F_BEARER_CAP) + gsm48_encode_bearer_cap(msg, 0, &proceeding->bearer_cap); + /* facility */ + if (proceeding->fields & MNCC_F_FACILITY) + gsm48_encode_facility(msg, 0, &proceeding->facility); + /* progress */ + if (proceeding->fields & MNCC_F_PROGRESS) + gsm48_encode_progress(msg, 0, &proceeding->progress); + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_cc_rx_alerting(struct gsm_trans *trans, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); + struct tlv_parsed tp; + struct gsm_mncc alerting; + + gsm48_stop_cc_timer(trans); + gsm48_start_cc_timer(trans, 0x301, GSM48_T301); + + memset(&alerting, 0, sizeof(struct gsm_mncc)); + alerting.callref = trans->callref; + tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0); + /* facility */ + if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) { + alerting.fields |= MNCC_F_FACILITY; + gsm48_decode_facility(&alerting.facility, + TLVP_VAL(&tp, GSM48_IE_FACILITY)-1); + } + + /* progress */ + if (TLVP_PRESENT(&tp, GSM48_IE_PROGR_IND)) { + alerting.fields |= MNCC_F_PROGRESS; + gsm48_decode_progress(&alerting.progress, + TLVP_VAL(&tp, GSM48_IE_PROGR_IND)-1); + } + /* ss-version */ + if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) { + alerting.fields |= MNCC_F_SSVERSION; + gsm48_decode_ssversion(&alerting.ssversion, + TLVP_VAL(&tp, GSM48_IE_SS_VERS)-1); + } + + new_cc_state(trans, GSM_CSTATE_CALL_RECEIVED); + + return mncc_recvmsg(trans->net, trans, MNCC_ALERT_IND, + &alerting); +} + +static int gsm48_cc_tx_alerting(struct gsm_trans *trans, void *arg) +{ + struct gsm_mncc *alerting = arg; + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC ALERT"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + gh->msg_type = GSM48_MT_CC_ALERTING; + + /* facility */ + if (alerting->fields & MNCC_F_FACILITY) + gsm48_encode_facility(msg, 0, &alerting->facility); + /* progress */ + if (alerting->fields & MNCC_F_PROGRESS) + gsm48_encode_progress(msg, 0, &alerting->progress); + /* user-user */ + if (alerting->fields & MNCC_F_USERUSER) + gsm48_encode_useruser(msg, 0, &alerting->useruser); + + new_cc_state(trans, GSM_CSTATE_CALL_DELIVERED); + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_cc_tx_progress(struct gsm_trans *trans, void *arg) +{ + struct gsm_mncc *progress = arg; + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC PROGRESS"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + gh->msg_type = GSM48_MT_CC_PROGRESS; + + /* progress */ + gsm48_encode_progress(msg, 1, &progress->progress); + /* user-user */ + if (progress->fields & MNCC_F_USERUSER) + gsm48_encode_useruser(msg, 0, &progress->useruser); + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_cc_tx_connect(struct gsm_trans *trans, void *arg) +{ + struct gsm_mncc *connect = arg; + struct msgb *msg = gsm48_msgb_alloc_name("GSN 04.08 CC CON"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + gh->msg_type = GSM48_MT_CC_CONNECT; + + gsm48_stop_cc_timer(trans); + gsm48_start_cc_timer(trans, 0x313, GSM48_T313); + + /* facility */ + if (connect->fields & MNCC_F_FACILITY) + gsm48_encode_facility(msg, 0, &connect->facility); + /* progress */ + if (connect->fields & MNCC_F_PROGRESS) + gsm48_encode_progress(msg, 0, &connect->progress); + /* connected number */ + if (connect->fields & MNCC_F_CONNECTED) + gsm48_encode_connected(msg, &connect->connected); + /* user-user */ + if (connect->fields & MNCC_F_USERUSER) + gsm48_encode_useruser(msg, 0, &connect->useruser); + + new_cc_state(trans, GSM_CSTATE_CONNECT_IND); + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_cc_rx_connect(struct gsm_trans *trans, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); + struct tlv_parsed tp; + struct gsm_mncc connect; + + gsm48_stop_cc_timer(trans); + + memset(&connect, 0, sizeof(struct gsm_mncc)); + connect.callref = trans->callref; + tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0); + /* use subscriber as connected party number */ + connect.fields |= MNCC_F_CONNECTED; + osmo_strlcpy(connect.connected.number, trans->subscr->extension, + sizeof(connect.connected.number)); + osmo_strlcpy(connect.imsi, trans->subscr->imsi, sizeof(connect.imsi)); + + /* facility */ + if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) { + connect.fields |= MNCC_F_FACILITY; + gsm48_decode_facility(&connect.facility, + TLVP_VAL(&tp, GSM48_IE_FACILITY)-1); + } + /* user-user */ + if (TLVP_PRESENT(&tp, GSM48_IE_USER_USER)) { + connect.fields |= MNCC_F_USERUSER; + gsm48_decode_useruser(&connect.useruser, + TLVP_VAL(&tp, GSM48_IE_USER_USER)-1); + } + /* ss-version */ + if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) { + connect.fields |= MNCC_F_SSVERSION; + gsm48_decode_ssversion(&connect.ssversion, + TLVP_VAL(&tp, GSM48_IE_SS_VERS)-1); + } + + new_cc_state(trans, GSM_CSTATE_CONNECT_REQUEST); + rate_ctr_inc(&trans->net->msc_ctrs->ctr[MSC_CTR_CALL_MT_CONNECT]); + + return mncc_recvmsg(trans->net, trans, MNCC_SETUP_CNF, &connect); +} + + +static int gsm48_cc_rx_connect_ack(struct gsm_trans *trans, struct msgb *msg) +{ + struct gsm_mncc connect_ack; + + gsm48_stop_cc_timer(trans); + + new_cc_state(trans, GSM_CSTATE_ACTIVE); + rate_ctr_inc(&trans->net->msc_ctrs->ctr[MSC_CTR_CALL_MO_CONNECT_ACK]); + + memset(&connect_ack, 0, sizeof(struct gsm_mncc)); + connect_ack.callref = trans->callref; + + return mncc_recvmsg(trans->net, trans, MNCC_SETUP_COMPL_IND, + &connect_ack); +} + +static int gsm48_cc_tx_connect_ack(struct gsm_trans *trans, void *arg) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC CON ACK"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + gh->msg_type = GSM48_MT_CC_CONNECT_ACK; + + new_cc_state(trans, GSM_CSTATE_ACTIVE); + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_cc_rx_disconnect(struct gsm_trans *trans, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); + struct tlv_parsed tp; + struct gsm_mncc disc; + + gsm48_stop_cc_timer(trans); + + new_cc_state(trans, GSM_CSTATE_DISCONNECT_REQ); + + memset(&disc, 0, sizeof(struct gsm_mncc)); + disc.callref = trans->callref; + tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, GSM48_IE_CAUSE, 0); + /* cause */ + if (TLVP_PRESENT(&tp, GSM48_IE_CAUSE)) { + disc.fields |= MNCC_F_CAUSE; + gsm48_decode_cause(&disc.cause, + TLVP_VAL(&tp, GSM48_IE_CAUSE)-1); + } + /* facility */ + if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) { + disc.fields |= MNCC_F_FACILITY; + gsm48_decode_facility(&disc.facility, + TLVP_VAL(&tp, GSM48_IE_FACILITY)-1); + } + /* user-user */ + if (TLVP_PRESENT(&tp, GSM48_IE_USER_USER)) { + disc.fields |= MNCC_F_USERUSER; + gsm48_decode_useruser(&disc.useruser, + TLVP_VAL(&tp, GSM48_IE_USER_USER)-1); + } + /* ss-version */ + if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) { + disc.fields |= MNCC_F_SSVERSION; + gsm48_decode_ssversion(&disc.ssversion, + TLVP_VAL(&tp, GSM48_IE_SS_VERS)-1); + } + + return mncc_recvmsg(trans->net, trans, MNCC_DISC_IND, &disc); + +} + +static struct gsm_mncc_cause default_cause = { + .location = GSM48_CAUSE_LOC_PRN_S_LU, + .coding = 0, + .rec = 0, + .rec_val = 0, + .value = GSM48_CC_CAUSE_NORMAL_UNSPEC, + .diag_len = 0, + .diag = { 0 }, +}; + +static int gsm48_cc_tx_disconnect(struct gsm_trans *trans, void *arg) +{ + struct gsm_mncc *disc = arg; + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC DISC"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + gh->msg_type = GSM48_MT_CC_DISCONNECT; + + gsm48_stop_cc_timer(trans); + gsm48_start_cc_timer(trans, 0x306, GSM48_T306); + + /* cause */ + if (disc->fields & MNCC_F_CAUSE) + gsm48_encode_cause(msg, 1, &disc->cause); + else + gsm48_encode_cause(msg, 1, &default_cause); + + /* facility */ + if (disc->fields & MNCC_F_FACILITY) + gsm48_encode_facility(msg, 0, &disc->facility); + /* progress */ + if (disc->fields & MNCC_F_PROGRESS) + gsm48_encode_progress(msg, 0, &disc->progress); + /* user-user */ + if (disc->fields & MNCC_F_USERUSER) + gsm48_encode_useruser(msg, 0, &disc->useruser); + + /* store disconnect cause for T306 expiry */ + memcpy(&trans->cc.msg, disc, sizeof(struct gsm_mncc)); + + new_cc_state(trans, GSM_CSTATE_DISCONNECT_IND); + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_cc_rx_release(struct gsm_trans *trans, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); + struct tlv_parsed tp; + struct gsm_mncc rel; + int rc; + + gsm48_stop_cc_timer(trans); + + memset(&rel, 0, sizeof(struct gsm_mncc)); + rel.callref = trans->callref; + tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0); + /* cause */ + if (TLVP_PRESENT(&tp, GSM48_IE_CAUSE)) { + rel.fields |= MNCC_F_CAUSE; + gsm48_decode_cause(&rel.cause, + TLVP_VAL(&tp, GSM48_IE_CAUSE)-1); + } + /* facility */ + if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) { + rel.fields |= MNCC_F_FACILITY; + gsm48_decode_facility(&rel.facility, + TLVP_VAL(&tp, GSM48_IE_FACILITY)-1); + } + /* user-user */ + if (TLVP_PRESENT(&tp, GSM48_IE_USER_USER)) { + rel.fields |= MNCC_F_USERUSER; + gsm48_decode_useruser(&rel.useruser, + TLVP_VAL(&tp, GSM48_IE_USER_USER)-1); + } + /* ss-version */ + if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) { + rel.fields |= MNCC_F_SSVERSION; + gsm48_decode_ssversion(&rel.ssversion, + TLVP_VAL(&tp, GSM48_IE_SS_VERS)-1); + } + + if (trans->cc.state == GSM_CSTATE_RELEASE_REQ) { + /* release collision 5.4.5 */ + rc = mncc_recvmsg(trans->net, trans, MNCC_REL_CNF, &rel); + } else { + rc = gsm48_tx_simple(trans->conn, + GSM48_PDISC_CC | (trans->transaction_id << 4), + GSM48_MT_CC_RELEASE_COMPL); + rc = mncc_recvmsg(trans->net, trans, MNCC_REL_IND, &rel); + } + + new_cc_state(trans, GSM_CSTATE_NULL); + + trans->callref = 0; + trans_free(trans); + + return rc; +} + +static int gsm48_cc_tx_release(struct gsm_trans *trans, void *arg) +{ + struct gsm_mncc *rel = arg; + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC REL"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + gh->msg_type = GSM48_MT_CC_RELEASE; + + gsm48_stop_cc_timer(trans); + gsm48_start_cc_timer(trans, 0x308, GSM48_T308); + + /* cause */ + if (rel->fields & MNCC_F_CAUSE) + gsm48_encode_cause(msg, 0, &rel->cause); + /* facility */ + if (rel->fields & MNCC_F_FACILITY) + gsm48_encode_facility(msg, 0, &rel->facility); + /* user-user */ + if (rel->fields & MNCC_F_USERUSER) + gsm48_encode_useruser(msg, 0, &rel->useruser); + + trans->cc.T308_second = 0; + memcpy(&trans->cc.msg, rel, sizeof(struct gsm_mncc)); + + if (trans->cc.state != GSM_CSTATE_RELEASE_REQ) + new_cc_state(trans, GSM_CSTATE_RELEASE_REQ); + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_cc_rx_release_compl(struct gsm_trans *trans, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); + struct tlv_parsed tp; + struct gsm_mncc rel; + int rc = 0; + + gsm48_stop_cc_timer(trans); + + memset(&rel, 0, sizeof(struct gsm_mncc)); + rel.callref = trans->callref; + tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0); + /* cause */ + if (TLVP_PRESENT(&tp, GSM48_IE_CAUSE)) { + rel.fields |= MNCC_F_CAUSE; + gsm48_decode_cause(&rel.cause, + TLVP_VAL(&tp, GSM48_IE_CAUSE)-1); + } + /* facility */ + if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) { + rel.fields |= MNCC_F_FACILITY; + gsm48_decode_facility(&rel.facility, + TLVP_VAL(&tp, GSM48_IE_FACILITY)-1); + } + /* user-user */ + if (TLVP_PRESENT(&tp, GSM48_IE_USER_USER)) { + rel.fields |= MNCC_F_USERUSER; + gsm48_decode_useruser(&rel.useruser, + TLVP_VAL(&tp, GSM48_IE_USER_USER)-1); + } + /* ss-version */ + if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) { + rel.fields |= MNCC_F_SSVERSION; + gsm48_decode_ssversion(&rel.ssversion, + TLVP_VAL(&tp, GSM48_IE_SS_VERS)-1); + } + + if (trans->callref) { + switch (trans->cc.state) { + case GSM_CSTATE_CALL_PRESENT: + rc = mncc_recvmsg(trans->net, trans, + MNCC_REJ_IND, &rel); + break; + case GSM_CSTATE_RELEASE_REQ: + rc = mncc_recvmsg(trans->net, trans, + MNCC_REL_CNF, &rel); + break; + default: + rc = mncc_recvmsg(trans->net, trans, + MNCC_REL_IND, &rel); + } + } + + trans->callref = 0; + trans_free(trans); + + return rc; +} + +static int gsm48_cc_tx_release_compl(struct gsm_trans *trans, void *arg) +{ + struct gsm_mncc *rel = arg; + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC REL COMPL"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + int ret; + + gh->msg_type = GSM48_MT_CC_RELEASE_COMPL; + + trans->callref = 0; + + gsm48_stop_cc_timer(trans); + + /* cause */ + if (rel->fields & MNCC_F_CAUSE) + gsm48_encode_cause(msg, 0, &rel->cause); + /* facility */ + if (rel->fields & MNCC_F_FACILITY) + gsm48_encode_facility(msg, 0, &rel->facility); + /* user-user */ + if (rel->fields & MNCC_F_USERUSER) + gsm48_encode_useruser(msg, 0, &rel->useruser); + + ret = gsm48_conn_sendmsg(msg, trans->conn, trans); + + trans_free(trans); + + return ret; +} + +static int gsm48_cc_rx_facility(struct gsm_trans *trans, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); + struct tlv_parsed tp; + struct gsm_mncc fac; + + memset(&fac, 0, sizeof(struct gsm_mncc)); + fac.callref = trans->callref; + tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, GSM48_IE_FACILITY, 0); + /* facility */ + if (TLVP_PRESENT(&tp, GSM48_IE_FACILITY)) { + fac.fields |= MNCC_F_FACILITY; + gsm48_decode_facility(&fac.facility, + TLVP_VAL(&tp, GSM48_IE_FACILITY)-1); + } + /* ss-version */ + if (TLVP_PRESENT(&tp, GSM48_IE_SS_VERS)) { + fac.fields |= MNCC_F_SSVERSION; + gsm48_decode_ssversion(&fac.ssversion, + TLVP_VAL(&tp, GSM48_IE_SS_VERS)-1); + } + + return mncc_recvmsg(trans->net, trans, MNCC_FACILITY_IND, &fac); +} + +static int gsm48_cc_tx_facility(struct gsm_trans *trans, void *arg) +{ + struct gsm_mncc *fac = arg; + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC FAC"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + gh->msg_type = GSM48_MT_CC_FACILITY; + + /* facility */ + gsm48_encode_facility(msg, 1, &fac->facility); + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_cc_rx_hold(struct gsm_trans *trans, struct msgb *msg) +{ + struct gsm_mncc hold; + + memset(&hold, 0, sizeof(struct gsm_mncc)); + hold.callref = trans->callref; + return mncc_recvmsg(trans->net, trans, MNCC_HOLD_IND, &hold); +} + +static int gsm48_cc_tx_hold_ack(struct gsm_trans *trans, void *arg) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC HLD ACK"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + gh->msg_type = GSM48_MT_CC_HOLD_ACK; + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_cc_tx_hold_rej(struct gsm_trans *trans, void *arg) +{ + struct gsm_mncc *hold_rej = arg; + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC HLD REJ"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + gh->msg_type = GSM48_MT_CC_HOLD_REJ; + + /* cause */ + if (hold_rej->fields & MNCC_F_CAUSE) + gsm48_encode_cause(msg, 1, &hold_rej->cause); + else + gsm48_encode_cause(msg, 1, &default_cause); + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_cc_rx_retrieve(struct gsm_trans *trans, struct msgb *msg) +{ + struct gsm_mncc retrieve; + + memset(&retrieve, 0, sizeof(struct gsm_mncc)); + retrieve.callref = trans->callref; + return mncc_recvmsg(trans->net, trans, MNCC_RETRIEVE_IND, + &retrieve); +} + +static int gsm48_cc_tx_retrieve_ack(struct gsm_trans *trans, void *arg) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC RETR ACK"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + gh->msg_type = GSM48_MT_CC_RETR_ACK; + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_cc_tx_retrieve_rej(struct gsm_trans *trans, void *arg) +{ + struct gsm_mncc *retrieve_rej = arg; + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC RETR REJ"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + gh->msg_type = GSM48_MT_CC_RETR_REJ; + + /* cause */ + if (retrieve_rej->fields & MNCC_F_CAUSE) + gsm48_encode_cause(msg, 1, &retrieve_rej->cause); + else + gsm48_encode_cause(msg, 1, &default_cause); + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_cc_rx_start_dtmf(struct gsm_trans *trans, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); + struct tlv_parsed tp; + struct gsm_mncc dtmf; + + memset(&dtmf, 0, sizeof(struct gsm_mncc)); + dtmf.callref = trans->callref; + tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, 0, 0); + /* keypad facility */ + if (TLVP_PRESENT(&tp, GSM48_IE_KPD_FACILITY)) { + dtmf.fields |= MNCC_F_KEYPAD; + gsm48_decode_keypad(&dtmf.keypad, + TLVP_VAL(&tp, GSM48_IE_KPD_FACILITY)-1); + } + + return mncc_recvmsg(trans->net, trans, MNCC_START_DTMF_IND, &dtmf); +} + +static int gsm48_cc_tx_start_dtmf_ack(struct gsm_trans *trans, void *arg) +{ + struct gsm_mncc *dtmf = arg; + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 DTMF ACK"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + gh->msg_type = GSM48_MT_CC_START_DTMF_ACK; + + /* keypad */ + if (dtmf->fields & MNCC_F_KEYPAD) + gsm48_encode_keypad(msg, dtmf->keypad); + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_cc_tx_start_dtmf_rej(struct gsm_trans *trans, void *arg) +{ + struct gsm_mncc *dtmf = arg; + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 DTMF REJ"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + gh->msg_type = GSM48_MT_CC_START_DTMF_REJ; + + /* cause */ + if (dtmf->fields & MNCC_F_CAUSE) + gsm48_encode_cause(msg, 1, &dtmf->cause); + else + gsm48_encode_cause(msg, 1, &default_cause); + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_cc_tx_stop_dtmf_ack(struct gsm_trans *trans, void *arg) +{ + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 DTMF STP ACK"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + gh->msg_type = GSM48_MT_CC_STOP_DTMF_ACK; + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_cc_rx_stop_dtmf(struct gsm_trans *trans, struct msgb *msg) +{ + struct gsm_mncc dtmf; + + memset(&dtmf, 0, sizeof(struct gsm_mncc)); + dtmf.callref = trans->callref; + + return mncc_recvmsg(trans->net, trans, MNCC_STOP_DTMF_IND, &dtmf); +} + +static int gsm48_cc_rx_modify(struct gsm_trans *trans, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); + struct tlv_parsed tp; + struct gsm_mncc modify; + + memset(&modify, 0, sizeof(struct gsm_mncc)); + modify.callref = trans->callref; + tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, GSM48_IE_BEARER_CAP, 0); + /* bearer capability */ + if (TLVP_PRESENT(&tp, GSM48_IE_BEARER_CAP)) { + modify.fields |= MNCC_F_BEARER_CAP; + gsm48_decode_bearer_cap(&modify.bearer_cap, + TLVP_VAL(&tp, GSM48_IE_BEARER_CAP)-1); + apply_codec_restrictions(trans->conn->bts, &modify.bearer_cap); + } + + new_cc_state(trans, GSM_CSTATE_MO_ORIG_MODIFY); + + return mncc_recvmsg(trans->net, trans, MNCC_MODIFY_IND, &modify); +} + +static int gsm48_cc_tx_modify(struct gsm_trans *trans, void *arg) +{ + struct gsm_mncc *modify = arg; + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC MOD"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + gh->msg_type = GSM48_MT_CC_MODIFY; + + gsm48_start_cc_timer(trans, 0x323, GSM48_T323); + + /* bearer capability */ + gsm48_encode_bearer_cap(msg, 1, &modify->bearer_cap); + + new_cc_state(trans, GSM_CSTATE_MO_TERM_MODIFY); + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_cc_rx_modify_complete(struct gsm_trans *trans, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); + struct tlv_parsed tp; + struct gsm_mncc modify; + + gsm48_stop_cc_timer(trans); + + memset(&modify, 0, sizeof(struct gsm_mncc)); + modify.callref = trans->callref; + tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, GSM48_IE_BEARER_CAP, 0); + /* bearer capability */ + if (TLVP_PRESENT(&tp, GSM48_IE_BEARER_CAP)) { + modify.fields |= MNCC_F_BEARER_CAP; + gsm48_decode_bearer_cap(&modify.bearer_cap, + TLVP_VAL(&tp, GSM48_IE_BEARER_CAP)-1); + apply_codec_restrictions(trans->conn->bts, &modify.bearer_cap); + } + + new_cc_state(trans, GSM_CSTATE_ACTIVE); + + return mncc_recvmsg(trans->net, trans, MNCC_MODIFY_CNF, &modify); +} + +static int gsm48_cc_tx_modify_complete(struct gsm_trans *trans, void *arg) +{ + struct gsm_mncc *modify = arg; + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC MOD COMPL"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + gh->msg_type = GSM48_MT_CC_MODIFY_COMPL; + + /* bearer capability */ + gsm48_encode_bearer_cap(msg, 1, &modify->bearer_cap); + + new_cc_state(trans, GSM_CSTATE_ACTIVE); + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_cc_rx_modify_reject(struct gsm_trans *trans, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); + struct tlv_parsed tp; + struct gsm_mncc modify; + + gsm48_stop_cc_timer(trans); + + memset(&modify, 0, sizeof(struct gsm_mncc)); + modify.callref = trans->callref; + tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, GSM48_IE_BEARER_CAP, GSM48_IE_CAUSE); + /* bearer capability */ + if (TLVP_PRESENT(&tp, GSM48_IE_BEARER_CAP)) { + modify.fields |= GSM48_IE_BEARER_CAP; + gsm48_decode_bearer_cap(&modify.bearer_cap, + TLVP_VAL(&tp, GSM48_IE_BEARER_CAP)-1); + apply_codec_restrictions(trans->conn->bts, &modify.bearer_cap); + } + /* cause */ + if (TLVP_PRESENT(&tp, GSM48_IE_CAUSE)) { + modify.fields |= MNCC_F_CAUSE; + gsm48_decode_cause(&modify.cause, + TLVP_VAL(&tp, GSM48_IE_CAUSE)-1); + } + + new_cc_state(trans, GSM_CSTATE_ACTIVE); + + return mncc_recvmsg(trans->net, trans, MNCC_MODIFY_REJ, &modify); +} + +static int gsm48_cc_tx_modify_reject(struct gsm_trans *trans, void *arg) +{ + struct gsm_mncc *modify = arg; + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC MOD REJ"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + gh->msg_type = GSM48_MT_CC_MODIFY_REJECT; + + /* bearer capability */ + gsm48_encode_bearer_cap(msg, 1, &modify->bearer_cap); + /* cause */ + gsm48_encode_cause(msg, 1, &modify->cause); + + new_cc_state(trans, GSM_CSTATE_ACTIVE); + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_cc_tx_notify(struct gsm_trans *trans, void *arg) +{ + struct gsm_mncc *notify = arg; + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 CC NOT"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + gh->msg_type = GSM48_MT_CC_NOTIFY; + + /* notify */ + gsm48_encode_notify(msg, notify->notify); + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_cc_rx_notify(struct gsm_trans *trans, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); +// struct tlv_parsed tp; + struct gsm_mncc notify; + + memset(¬ify, 0, sizeof(struct gsm_mncc)); + notify.callref = trans->callref; +// tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len); + if (payload_len >= 1) + gsm48_decode_notify(¬ify.notify, gh->data); + + return mncc_recvmsg(trans->net, trans, MNCC_NOTIFY_IND, ¬ify); +} + +static int gsm48_cc_tx_userinfo(struct gsm_trans *trans, void *arg) +{ + struct gsm_mncc *user = arg; + struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 USR INFO"); + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); + + gh->msg_type = GSM48_MT_CC_USER_INFO; + + /* user-user */ + if (user->fields & MNCC_F_USERUSER) + gsm48_encode_useruser(msg, 1, &user->useruser); + /* more data */ + if (user->more) + gsm48_encode_more(msg); + + return gsm48_conn_sendmsg(msg, trans->conn, trans); +} + +static int gsm48_cc_rx_userinfo(struct gsm_trans *trans, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); + struct tlv_parsed tp; + struct gsm_mncc user; + + memset(&user, 0, sizeof(struct gsm_mncc)); + user.callref = trans->callref; + tlv_parse(&tp, &gsm48_att_tlvdef, gh->data, payload_len, GSM48_IE_USER_USER, 0); + /* user-user */ + if (TLVP_PRESENT(&tp, GSM48_IE_USER_USER)) { + user.fields |= MNCC_F_USERUSER; + gsm48_decode_useruser(&user.useruser, + TLVP_VAL(&tp, GSM48_IE_USER_USER)-1); + } + /* more data */ + if (TLVP_PRESENT(&tp, GSM48_IE_MORE_DATA)) + user.more = 1; + + return mncc_recvmsg(trans->net, trans, MNCC_USERINFO_IND, &user); +} + +static int _gsm48_lchan_modify(struct gsm_trans *trans, void *arg) +{ + struct gsm_mncc *mode = arg; + struct gsm_lchan *lchan = trans->conn->lchan; + + /* + * We were forced to make an assignment a lot earlier and + * we should avoid sending another assignment that might + * even lead to a different kind of lchan (TCH/F vs. TCH/H). + * In case of rtp-bridge it is too late to change things + * here. + */ + if (trans->conn->mncc_rtp_bridge && lchan->tch_mode != GSM48_CMODE_SIGN) + return 0; + + return gsm0808_assign_req(trans->conn, mode->lchan_mode, + trans->conn->lchan->type != GSM_LCHAN_TCH_H); +} + +static void mncc_recv_rtp(struct gsm_network *net, uint32_t callref, + int cmd, uint32_t addr, uint16_t port, uint32_t payload_type, + uint32_t payload_msg_type) +{ + uint8_t data[sizeof(struct gsm_mncc)]; + struct gsm_mncc_rtp *rtp; + + memset(&data, 0, sizeof(data)); + rtp = (struct gsm_mncc_rtp *) &data[0]; + + rtp->callref = callref; + rtp->msg_type = cmd; + rtp->ip = addr; + rtp->port = port; + rtp->payload_type = payload_type; + rtp->payload_msg_type = payload_msg_type; + mncc_recvmsg(net, NULL, cmd, (struct gsm_mncc *)data); +} + +static void mncc_recv_rtp_sock(struct gsm_network *net, struct gsm_trans *trans, int cmd) +{ + struct gsm_lchan *lchan; + int msg_type; + + lchan = trans->conn->lchan; + switch (lchan->abis_ip.rtp_payload) { + case RTP_PT_GSM_FULL: + msg_type = GSM_TCHF_FRAME; + break; + case RTP_PT_GSM_EFR: + msg_type = GSM_TCHF_FRAME_EFR; + break; + case RTP_PT_GSM_HALF: + msg_type = GSM_TCHH_FRAME; + break; + case RTP_PT_AMR: + msg_type = GSM_TCH_FRAME_AMR; + break; + default: + LOGP(DMNCC, LOGL_ERROR, "%s unknown payload type %d\n", + gsm_lchan_name(lchan), lchan->abis_ip.rtp_payload); + msg_type = 0; + break; + } + + return mncc_recv_rtp(net, trans->callref, cmd, + lchan->abis_ip.bound_ip, + lchan->abis_ip.bound_port, + lchan->abis_ip.rtp_payload, + msg_type); +} + +static void mncc_recv_rtp_err(struct gsm_network *net, uint32_t callref, int cmd) +{ + return mncc_recv_rtp(net, callref, cmd, 0, 0, 0, 0); +} + +static int tch_rtp_create(struct gsm_network *net, uint32_t callref) +{ + struct gsm_bts *bts; + struct gsm_lchan *lchan; + struct gsm_trans *trans; + enum gsm48_chan_mode m; + + /* Find callref */ + trans = trans_find_by_callref(net, callref); + if (!trans) { + LOGP(DMNCC, LOGL_ERROR, "RTP create for non-existing trans\n"); + mncc_recv_rtp_err(net, callref, MNCC_RTP_CREATE); + return -EIO; + } + log_set_context(LOG_CTX_VLR_SUBSCR, trans->subscr); + if (!trans->conn) { + LOGP(DMNCC, LOGL_NOTICE, "RTP create for trans without conn\n"); + mncc_recv_rtp_err(net, callref, MNCC_RTP_CREATE); + return 0; + } + + lchan = trans->conn->lchan; + bts = lchan->ts->trx->bts; + if (!is_ipaccess_bts(bts)) { + /* + * I want this to be straight forward and have no audio flow + * through the nitb/osmo-mss system. This currently means that + * this will not work with BS11/Nokia type BTS. We would need + * to have a trau<->rtp bridge for these but still preferable + * in another process. + */ + LOGP(DMNCC, LOGL_ERROR, "RTP create only works with IP systems\n"); + mncc_recv_rtp_err(net, callref, MNCC_RTP_CREATE); + return -EINVAL; + } + + trans->conn->mncc_rtp_bridge = 1; + /* + * *sigh* we need to pick a codec now. Pick the most generic one + * right now and hope we could fix that later on. This is very + * similiar to the routine above. + * Fallback to the internal MNCC mode to select a route. + */ + if (lchan->tch_mode == GSM48_CMODE_SIGN) { + trans->conn->mncc_rtp_create_pending = 1; + m = mncc_codec_for_mode(lchan->type); + LOGP(DMNCC, LOGL_DEBUG, "RTP create: codec=%s, chan_type=%s\n", + get_value_string(gsm48_chan_mode_names, m), + get_value_string(gsm_chan_t_names, lchan->type)); + return gsm0808_assign_req(trans->conn, m, + lchan->type != GSM_LCHAN_TCH_H); + } + + mncc_recv_rtp_sock(trans->net, trans, MNCC_RTP_CREATE); + return 0; +} + +static int tch_rtp_connect(struct gsm_network *net, void *arg) +{ + struct gsm_lchan *lchan; + struct gsm_trans *trans; + struct gsm_mncc_rtp *rtp = arg; + + /* Find callref */ + trans = trans_find_by_callref(net, rtp->callref); + if (!trans) { + LOGP(DMNCC, LOGL_ERROR, "RTP connect for non-existing trans\n"); + mncc_recv_rtp_err(net, rtp->callref, MNCC_RTP_CONNECT); + return -EIO; + } + log_set_context(LOG_CTX_VLR_SUBSCR, trans->subscr); + if (!trans->conn) { + LOGP(DMNCC, LOGL_ERROR, "RTP connect for trans without conn\n"); + mncc_recv_rtp_err(net, rtp->callref, MNCC_RTP_CONNECT); + return 0; + } + + lchan = trans->conn->lchan; + LOGP(DMNCC, LOGL_DEBUG, "RTP connect: codec=%s, chan_type=%s\n", + get_value_string(gsm48_chan_mode_names, + mncc_codec_for_mode(lchan->type)), + get_value_string(gsm_chan_t_names, lchan->type)); + + /* TODO: Check if payload_msg_type is compatible with what we have */ + if (rtp->payload_type != lchan->abis_ip.rtp_payload) { + LOGP(DMNCC, LOGL_ERROR, "RTP connect with different RTP payload\n"); + mncc_recv_rtp_err(net, rtp->callref, MNCC_RTP_CONNECT); + } + + /* + * FIXME: payload2 can't be sent with MDCX as the osmo-bts code + * complains about both rtp and rtp payload2 being present in the + * same package! + */ + trans->conn->mncc_rtp_connect_pending = 1; + return rsl_ipacc_mdcx(lchan, rtp->ip, rtp->port, 0); +} + +static int tch_rtp_signal(struct gsm_lchan *lchan, int signal) +{ + struct gsm_network *net; + struct gsm_trans *tmp, *trans = NULL; + + net = lchan->ts->trx->bts->network; + llist_for_each_entry(tmp, &net->trans_list, entry) { + if (!tmp->conn) + continue; + if (tmp->conn->lchan != lchan && tmp->conn->ho_lchan != lchan) + continue; + trans = tmp; + break; + } + + if (!trans) { + LOGP(DMNCC, LOGL_ERROR, "%s IPA abis signal but no transaction.\n", + gsm_lchan_name(lchan)); + return 0; + } + + switch (signal) { + case S_ABISIP_CRCX_ACK: + if (lchan->conn->mncc_rtp_create_pending) { + lchan->conn->mncc_rtp_create_pending = 0; + LOGP(DMNCC, LOGL_NOTICE, "%s sending pending RTP create ind.\n", + gsm_lchan_name(lchan)); + mncc_recv_rtp_sock(net, trans, MNCC_RTP_CREATE); + } + /* + * TODO: this appears to be too early? Why not until after + * the handover detect or the handover complete? + */ + maybe_switch_for_handover(lchan); + break; + case S_ABISIP_MDCX_ACK: + if (lchan->conn->mncc_rtp_connect_pending) { + lchan->conn->mncc_rtp_connect_pending = 0; + LOGP(DMNCC, LOGL_NOTICE, "%s sending pending RTP connect ind.\n", + gsm_lchan_name(lchan)); + mncc_recv_rtp_sock(net, trans, MNCC_RTP_CONNECT); + } + break; + } + + return 0; +} + + +static struct downstate { + uint32_t states; + int type; + int (*rout) (struct gsm_trans *trans, void *arg); +} downstatelist[] = { + /* mobile originating call establishment */ + {SBIT(GSM_CSTATE_INITIATED), /* 5.2.1.2 */ + MNCC_CALL_PROC_REQ, gsm48_cc_tx_call_proc}, + {SBIT(GSM_CSTATE_INITIATED) | SBIT(GSM_CSTATE_MO_CALL_PROC), /* 5.2.1.2 | 5.2.1.5 */ + MNCC_ALERT_REQ, gsm48_cc_tx_alerting}, + {SBIT(GSM_CSTATE_INITIATED) | SBIT(GSM_CSTATE_MO_CALL_PROC) | SBIT(GSM_CSTATE_CALL_DELIVERED), /* 5.2.1.2 | 5.2.1.6 | 5.2.1.6 */ + MNCC_SETUP_RSP, gsm48_cc_tx_connect}, + {SBIT(GSM_CSTATE_MO_CALL_PROC), /* 5.2.1.4.2 */ + MNCC_PROGRESS_REQ, gsm48_cc_tx_progress}, + /* mobile terminating call establishment */ + {SBIT(GSM_CSTATE_NULL), /* 5.2.2.1 */ + MNCC_SETUP_REQ, gsm48_cc_tx_setup}, + {SBIT(GSM_CSTATE_CONNECT_REQUEST), + MNCC_SETUP_COMPL_REQ, gsm48_cc_tx_connect_ack}, + /* signalling during call */ + {SBIT(GSM_CSTATE_ACTIVE), + MNCC_NOTIFY_REQ, gsm48_cc_tx_notify}, + {ALL_STATES - SBIT(GSM_CSTATE_NULL) - SBIT(GSM_CSTATE_RELEASE_REQ), + MNCC_FACILITY_REQ, gsm48_cc_tx_facility}, + {ALL_STATES, + MNCC_START_DTMF_RSP, gsm48_cc_tx_start_dtmf_ack}, + {ALL_STATES, + MNCC_START_DTMF_REJ, gsm48_cc_tx_start_dtmf_rej}, + {ALL_STATES, + MNCC_STOP_DTMF_RSP, gsm48_cc_tx_stop_dtmf_ack}, + {SBIT(GSM_CSTATE_ACTIVE), + MNCC_HOLD_CNF, gsm48_cc_tx_hold_ack}, + {SBIT(GSM_CSTATE_ACTIVE), + MNCC_HOLD_REJ, gsm48_cc_tx_hold_rej}, + {SBIT(GSM_CSTATE_ACTIVE), + MNCC_RETRIEVE_CNF, gsm48_cc_tx_retrieve_ack}, + {SBIT(GSM_CSTATE_ACTIVE), + MNCC_RETRIEVE_REJ, gsm48_cc_tx_retrieve_rej}, + {SBIT(GSM_CSTATE_ACTIVE), + MNCC_MODIFY_REQ, gsm48_cc_tx_modify}, + {SBIT(GSM_CSTATE_MO_ORIG_MODIFY), + MNCC_MODIFY_RSP, gsm48_cc_tx_modify_complete}, + {SBIT(GSM_CSTATE_MO_ORIG_MODIFY), + MNCC_MODIFY_REJ, gsm48_cc_tx_modify_reject}, + {SBIT(GSM_CSTATE_ACTIVE), + MNCC_USERINFO_REQ, gsm48_cc_tx_userinfo}, + /* clearing */ + {SBIT(GSM_CSTATE_INITIATED), + MNCC_REJ_REQ, gsm48_cc_tx_release_compl}, + {ALL_STATES - SBIT(GSM_CSTATE_NULL) - SBIT(GSM_CSTATE_DISCONNECT_IND) - SBIT(GSM_CSTATE_RELEASE_REQ) - SBIT(GSM_CSTATE_DISCONNECT_REQ), /* 5.4.4 */ + MNCC_DISC_REQ, gsm48_cc_tx_disconnect}, + {ALL_STATES - SBIT(GSM_CSTATE_NULL) - SBIT(GSM_CSTATE_RELEASE_REQ), /* 5.4.3.2 */ + MNCC_REL_REQ, gsm48_cc_tx_release}, + /* special */ + {ALL_STATES, + MNCC_LCHAN_MODIFY, _gsm48_lchan_modify}, +}; + +#define DOWNSLLEN \ + (sizeof(downstatelist) / sizeof(struct downstate)) + + +int mncc_tx_to_cc(struct gsm_network *net, int msg_type, void *arg) +{ + int i, rc = 0; + struct gsm_trans *trans = NULL, *transt; + struct gsm_subscriber_connection *conn = NULL; + struct gsm_bts *bts = NULL; + struct gsm_mncc *data = arg, rel; + + DEBUGP(DMNCC, "receive message %s\n", get_mncc_name(msg_type)); + + /* handle special messages */ + switch(msg_type) { + case MNCC_BRIDGE: + rc = tch_bridge(net, arg); + if (rc < 0) + disconnect_bridge(net, arg, -rc); + return rc; + case MNCC_FRAME_DROP: + return tch_recv_mncc(net, data->callref, 0); + case MNCC_FRAME_RECV: + return tch_recv_mncc(net, data->callref, 1); + case MNCC_RTP_CREATE: + return tch_rtp_create(net, data->callref); + case MNCC_RTP_CONNECT: + return tch_rtp_connect(net, arg); + case MNCC_RTP_FREE: + /* unused right now */ + return -EIO; + case GSM_TCHF_FRAME: + case GSM_TCHF_FRAME_EFR: + case GSM_TCHH_FRAME: + case GSM_TCH_FRAME_AMR: + /* Find callref */ + trans = trans_find_by_callref(net, data->callref); + if (!trans) { + LOGP(DMNCC, LOGL_ERROR, "TCH frame for non-existing trans\n"); + return -EIO; + } + log_set_context(LOG_CTX_VLR_SUBSCR, trans->subscr); + if (!trans->conn) { + LOGP(DMNCC, LOGL_NOTICE, "TCH frame for trans without conn\n"); + return 0; + } + if (!trans->conn->lchan) { + LOGP(DMNCC, LOGL_NOTICE, "TCH frame for trans without lchan\n"); + return 0; + } + if (trans->conn->lchan->type != GSM_LCHAN_TCH_F + && trans->conn->lchan->type != GSM_LCHAN_TCH_H) { + /* This should be LOGL_ERROR or NOTICE, but + * unfortuantely it happens for a couple of frames at + * the beginning of every RTP connection */ + LOGP(DMNCC, LOGL_DEBUG, "TCH frame for lchan != TCH_F/TCH_H\n"); + return 0; + } + bts = trans->conn->lchan->ts->trx->bts; + switch (bts->type) { + case GSM_BTS_TYPE_NANOBTS: + case GSM_BTS_TYPE_OSMOBTS: + if (!trans->conn->lchan->abis_ip.rtp_socket) { + DEBUGP(DMNCC, "TCH frame to lchan without RTP connection\n"); + return 0; + } + return rtp_send_frame(trans->conn->lchan->abis_ip.rtp_socket, arg); + case GSM_BTS_TYPE_BS11: + case GSM_BTS_TYPE_RBS2000: + case GSM_BTS_TYPE_NOKIA_SITE: + return trau_send_frame(trans->conn->lchan, arg); + default: + LOGP(DCC, LOGL_ERROR, "Unknown BTS type %u\n", bts->type); + } + return -EINVAL; + } + + memset(&rel, 0, sizeof(struct gsm_mncc)); + rel.callref = data->callref; + + /* Find callref */ + trans = trans_find_by_callref(net, data->callref); + + /* Callref unknown */ + if (!trans) { + struct gsm_subscriber *subscr; + + if (msg_type != MNCC_SETUP_REQ) { + DEBUGP(DCC, "(bts - trx - ts - ti -- sub %s) " + "Received '%s' from MNCC with " + "unknown callref %d\n", data->called.number, + get_mncc_name(msg_type), data->callref); + /* Invalid call reference */ + return mncc_release_ind(net, NULL, data->callref, + GSM48_CAUSE_LOC_PRN_S_LU, + GSM48_CC_CAUSE_INVAL_TRANS_ID); + } + if (!data->called.number[0] && !data->imsi[0]) { + DEBUGP(DCC, "(bts - trx - ts - ti) " + "Received '%s' from MNCC with " + "no number or IMSI\n", get_mncc_name(msg_type)); + /* Invalid number */ + return mncc_release_ind(net, NULL, data->callref, + GSM48_CAUSE_LOC_PRN_S_LU, + GSM48_CC_CAUSE_INV_NR_FORMAT); + } + /* New transaction due to setup, find subscriber */ + if (data->called.number[0]) + subscr = subscr_get_by_extension(net->subscr_group, + data->called.number); + else + subscr = subscr_get_by_imsi(net->subscr_group, + data->imsi); + + /* update the subscriber we deal with */ + log_set_context(LOG_CTX_VLR_SUBSCR, subscr); + + /* If subscriber is not found */ + if (!subscr) { + DEBUGP(DCC, "(bts - trx - ts - ti -- sub %s) " + "Received '%s' from MNCC with " + "unknown subscriber %s\n", data->called.number, + get_mncc_name(msg_type), data->called.number); + /* Unknown subscriber */ + return mncc_release_ind(net, NULL, data->callref, + GSM48_CAUSE_LOC_PRN_S_LU, + GSM48_CC_CAUSE_UNASSIGNED_NR); + } + /* If subscriber is not "attached" */ + if (!subscr->lac) { + DEBUGP(DCC, "(bts - trx - ts - ti -- sub %s) " + "Received '%s' from MNCC with " + "detached subscriber %s\n", data->called.number, + get_mncc_name(msg_type), data->called.number); + subscr_put(subscr); + /* Temporarily out of order */ + return mncc_release_ind(net, NULL, data->callref, + GSM48_CAUSE_LOC_PRN_S_LU, + GSM48_CC_CAUSE_DEST_OOO); + } + /* Create transaction */ + trans = trans_alloc(net, subscr, GSM48_PDISC_CC, 0xff, data->callref); + if (!trans) { + DEBUGP(DCC, "No memory for trans.\n"); + subscr_put(subscr); + /* Ressource unavailable */ + mncc_release_ind(net, NULL, data->callref, + GSM48_CAUSE_LOC_PRN_S_LU, + GSM48_CC_CAUSE_RESOURCE_UNAVAIL); + return -ENOMEM; + } + /* Find lchan */ + conn = connection_for_subscr(subscr); + + /* If subscriber has no lchan */ + if (!conn) { + /* find transaction with this subscriber already paging */ + llist_for_each_entry(transt, &net->trans_list, entry) { + /* Transaction of our lchan? */ + if (transt == trans || + transt->subscr != subscr) + continue; + DEBUGP(DCC, "(bts - trx - ts - ti -- sub %s) " + "Received '%s' from MNCC with " + "unallocated channel, paging already " + "started for lac %d.\n", + data->called.number, + get_mncc_name(msg_type), subscr->lac); + subscr_put(subscr); + trans_free(trans); + return 0; + } + /* store setup informations until paging was successfull */ + memcpy(&trans->cc.msg, data, sizeof(struct gsm_mncc)); + + /* Request a channel */ + trans->paging_request = subscr_request_channel(subscr, + RSL_CHANNEED_TCH_F, setup_trig_pag_evt, + trans); + if (!trans->paging_request) { + LOGP(DCC, LOGL_ERROR, "Failed to allocate paging token.\n"); + subscr_put(subscr); + trans_free(trans); + return 0; + } + subscr_put(subscr); + return 0; + } + /* Assign lchan */ + trans->conn = conn; + subscr_put(subscr); + } else { + /* update the subscriber we deal with */ + log_set_context(LOG_CTX_VLR_SUBSCR, trans->subscr); + } + + if (trans->conn) + conn = trans->conn; + + /* if paging did not respond yet */ + if (!conn) { + DEBUGP(DCC, "(bts - trx - ts - ti -- sub %s) " + "Received '%s' from MNCC in paging state\n", + (trans->subscr)?(trans->subscr->extension):"-", + get_mncc_name(msg_type)); + mncc_set_cause(&rel, GSM48_CAUSE_LOC_PRN_S_LU, + GSM48_CC_CAUSE_NORM_CALL_CLEAR); + if (msg_type == MNCC_REL_REQ) + rc = mncc_recvmsg(net, trans, MNCC_REL_CNF, &rel); + else + rc = mncc_recvmsg(net, trans, MNCC_REL_IND, &rel); + trans->callref = 0; + trans_free(trans); + return rc; + } + + DEBUGP(DCC, "(bts %d trx %d ts %d ti %02x sub %s) " + "Received '%s' from MNCC in state %d (%s)\n", + conn->bts->nr, conn->lchan->ts->trx->nr, conn->lchan->ts->nr, + trans->transaction_id, + (trans->conn->subscr)?(trans->conn->subscr->extension):"-", + get_mncc_name(msg_type), trans->cc.state, + gsm48_cc_state_name(trans->cc.state)); + + /* Find function for current state and message */ + for (i = 0; i < DOWNSLLEN; i++) + if ((msg_type == downstatelist[i].type) + && ((1 << trans->cc.state) & downstatelist[i].states)) + break; + if (i == DOWNSLLEN) { + DEBUGP(DCC, "Message unhandled at this state.\n"); + return 0; + } + + rc = downstatelist[i].rout(trans, arg); + + return rc; +} + + +static struct datastate { + uint32_t states; + int type; + int (*rout) (struct gsm_trans *trans, struct msgb *msg); +} datastatelist[] = { + /* mobile originating call establishment */ + {SBIT(GSM_CSTATE_NULL), /* 5.2.1.2 */ + GSM48_MT_CC_SETUP, gsm48_cc_rx_setup}, + {SBIT(GSM_CSTATE_NULL), /* 5.2.1.2 */ + GSM48_MT_CC_EMERG_SETUP, gsm48_cc_rx_setup}, + {SBIT(GSM_CSTATE_CONNECT_IND), /* 5.2.1.2 */ + GSM48_MT_CC_CONNECT_ACK, gsm48_cc_rx_connect_ack}, + /* mobile terminating call establishment */ + {SBIT(GSM_CSTATE_CALL_PRESENT), /* 5.2.2.3.2 */ + GSM48_MT_CC_CALL_CONF, gsm48_cc_rx_call_conf}, + {SBIT(GSM_CSTATE_CALL_PRESENT) | SBIT(GSM_CSTATE_MO_TERM_CALL_CONF), /* ???? | 5.2.2.3.2 */ + GSM48_MT_CC_ALERTING, gsm48_cc_rx_alerting}, + {SBIT(GSM_CSTATE_CALL_PRESENT) | SBIT(GSM_CSTATE_MO_TERM_CALL_CONF) | SBIT(GSM_CSTATE_CALL_RECEIVED), /* (5.2.2.6) | 5.2.2.6 | 5.2.2.6 */ + GSM48_MT_CC_CONNECT, gsm48_cc_rx_connect}, + /* signalling during call */ + {ALL_STATES - SBIT(GSM_CSTATE_NULL), + GSM48_MT_CC_FACILITY, gsm48_cc_rx_facility}, + {SBIT(GSM_CSTATE_ACTIVE), + GSM48_MT_CC_NOTIFY, gsm48_cc_rx_notify}, + {ALL_STATES, + GSM48_MT_CC_START_DTMF, gsm48_cc_rx_start_dtmf}, + {ALL_STATES, + GSM48_MT_CC_STOP_DTMF, gsm48_cc_rx_stop_dtmf}, + {ALL_STATES, + GSM48_MT_CC_STATUS_ENQ, gsm48_cc_rx_status_enq}, + {SBIT(GSM_CSTATE_ACTIVE), + GSM48_MT_CC_HOLD, gsm48_cc_rx_hold}, + {SBIT(GSM_CSTATE_ACTIVE), + GSM48_MT_CC_RETR, gsm48_cc_rx_retrieve}, + {SBIT(GSM_CSTATE_ACTIVE), + GSM48_MT_CC_MODIFY, gsm48_cc_rx_modify}, + {SBIT(GSM_CSTATE_MO_TERM_MODIFY), + GSM48_MT_CC_MODIFY_COMPL, gsm48_cc_rx_modify_complete}, + {SBIT(GSM_CSTATE_MO_TERM_MODIFY), + GSM48_MT_CC_MODIFY_REJECT, gsm48_cc_rx_modify_reject}, + {SBIT(GSM_CSTATE_ACTIVE), + GSM48_MT_CC_USER_INFO, gsm48_cc_rx_userinfo}, + /* clearing */ + {ALL_STATES - SBIT(GSM_CSTATE_NULL) - SBIT(GSM_CSTATE_RELEASE_REQ), /* 5.4.3.2 */ + GSM48_MT_CC_DISCONNECT, gsm48_cc_rx_disconnect}, + {ALL_STATES - SBIT(GSM_CSTATE_NULL), /* 5.4.4.1.2.2 */ + GSM48_MT_CC_RELEASE, gsm48_cc_rx_release}, + {ALL_STATES, /* 5.4.3.4 */ + GSM48_MT_CC_RELEASE_COMPL, gsm48_cc_rx_release_compl}, +}; + +#define DATASLLEN \ + (sizeof(datastatelist) / sizeof(struct datastate)) + +static int gsm0408_rcv_cc(struct gsm_subscriber_connection *conn, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + uint8_t msg_type = gsm48_hdr_msg_type(gh); + uint8_t transaction_id = gsm48_hdr_trans_id_flip_ti(gh); + struct gsm_trans *trans = NULL; + int i, rc = 0; + + if (msg_type & 0x80) { + DEBUGP(DCC, "MSG 0x%2x not defined for PD error\n", msg_type); + return -EINVAL; + } + + if (!conn->subscr) { + LOGP(DCC, LOGL_ERROR, "Invalid conn, no subscriber\n"); + return -EINVAL; + } + + /* Find transaction */ + trans = trans_find_by_id(conn, GSM48_PDISC_CC, transaction_id); + + DEBUGP(DCC, "(bts %d trx %d ts %d ti %x sub %s) " + "Received '%s' from MS in state %d (%s)\n", + conn->bts->nr, conn->lchan->ts->trx->nr, conn->lchan->ts->nr, + transaction_id, (conn->subscr)?(conn->subscr->extension):"-", + gsm48_cc_msg_name(msg_type), trans?(trans->cc.state):0, + gsm48_cc_state_name(trans?(trans->cc.state):0)); + + /* Create transaction */ + if (!trans) { + DEBUGP(DCC, "Unknown transaction ID %x, " + "creating new trans.\n", transaction_id); + /* Create transaction */ + trans = trans_alloc(conn->network, conn->subscr, + GSM48_PDISC_CC, + transaction_id, new_callref++); + if (!trans) { + DEBUGP(DCC, "No memory for trans.\n"); + rc = gsm48_tx_simple(conn, + GSM48_PDISC_CC | (transaction_id << 4), + GSM48_MT_CC_RELEASE_COMPL); + return -ENOMEM; + } + /* Assign transaction */ + trans->conn = conn; + } + + /* find function for current state and message */ + for (i = 0; i < DATASLLEN; i++) + if ((msg_type == datastatelist[i].type) + && ((1 << trans->cc.state) & datastatelist[i].states)) + break; + if (i == DATASLLEN) { + DEBUGP(DCC, "Message unhandled at this state.\n"); + return 0; + } + + assert(trans->subscr); + + rc = datastatelist[i].rout(trans, msg); + + return rc; +} + +/* Create a dummy to wait five seconds */ +static void release_anchor(struct gsm_subscriber_connection *conn) +{ + if (!conn->anch_operation) + return; + + osmo_timer_del(&conn->anch_operation->timeout); + talloc_free(conn->anch_operation); + conn->anch_operation = NULL; +} + +static void anchor_timeout(void *_data) +{ + struct gsm_subscriber_connection *con = _data; + + release_anchor(con); + msc_release_connection(con); +} + +int gsm0408_new_conn(struct gsm_subscriber_connection *conn) +{ + conn->anch_operation = talloc_zero(conn, struct gsm_anchor_operation); + if (!conn->anch_operation) + return -1; + + osmo_timer_setup(&conn->anch_operation->timeout, anchor_timeout, conn); + osmo_timer_schedule(&conn->anch_operation->timeout, 5, 0); + return 0; +} + +struct gsm_subscriber_connection *msc_subscr_con_allocate(struct gsm_network *network) +{ + struct gsm_subscriber_connection *conn; + + conn = talloc_zero(network, struct gsm_subscriber_connection); + if (!conn) + return NULL; + + conn->network = network; + llist_add_tail(&conn->entry, &network->subscr_conns); + return conn; +} + +void msc_subscr_con_free(struct gsm_subscriber_connection *conn) +{ + if (!conn) + return; + + if (conn->subscr) { + subscr_put(conn->subscr); + conn->subscr = NULL; + } + + llist_del(&conn->entry); + talloc_free(conn); +} + +/* Main entry point for GSM 04.08/44.008 Layer 3 data (e.g. from the BSC). */ +int gsm0408_dispatch(struct gsm_subscriber_connection *conn, struct msgb *msg) +{ + struct gsm48_hdr *gh = msgb_l3(msg); + uint8_t pdisc = gsm48_hdr_pdisc(gh); + int rc = 0; + + OSMO_ASSERT(conn); + OSMO_ASSERT(msg); + + LOGP(DRLL, LOGL_DEBUG, "Dispatching 04.08 message, pdisc=%d\n", pdisc); +#if 0 + if (silent_call_reroute(conn, msg)) + return silent_call_rx(conn, msg); +#endif + + switch (pdisc) { + case GSM48_PDISC_CC: + release_anchor(conn); + rc = gsm0408_rcv_cc(conn, msg); + break; + case GSM48_PDISC_MM: + rc = gsm0408_rcv_mm(conn, msg); + break; + case GSM48_PDISC_RR: + rc = gsm0408_rcv_rr(conn, msg); + break; + case GSM48_PDISC_SMS: + release_anchor(conn); + rc = gsm0411_rcv_sms(conn, msg); + break; + case GSM48_PDISC_MM_GPRS: + case GSM48_PDISC_SM_GPRS: + LOGP(DRLL, LOGL_NOTICE, "Unimplemented " + "GSM 04.08 discriminator 0x%02x\n", pdisc); + rc = -ENOTSUP; + break; + case GSM48_PDISC_NC_SS: + release_anchor(conn); + rc = handle_rcv_ussd(conn, msg); + break; + default: + LOGP(DRLL, LOGL_NOTICE, "Unknown " + "GSM 04.08 discriminator 0x%02x\n", pdisc); + rc = -EINVAL; + break; + } + + return rc; +} + +/* + * This will be run by the linker when loading the DSO. We use it to + * do system initialization, e.g. registration of signal handlers. + */ +static __attribute__((constructor)) void on_dso_load_0408(void) +{ + osmo_signal_register_handler(SS_ABISIP, handle_abisip_signal, NULL); +} |