| /* (C) 2017 by sysmocom s.f.m.c. GmbH |
| * (C) 2018 by Harald Welte <laforge@gnumonks.org> |
| * All Rights Reserved |
| * |
| * Author: Philipp Maier |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Affero General Public License as published by |
| * the Free Software Foundation; either version 3 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU Affero General Public License for more details. |
| * |
| * You should have received a copy of the GNU Affero General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| #include <osmocom/core/utils.h> |
| #include <osmocom/core/msgb.h> |
| #include <osmocom/core/logging.h> |
| #include <osmocom/sigtran/sccp_helpers.h> |
| #include <osmocom/sigtran/sccp_sap.h> |
| #include <osmocom/sigtran/osmo_ss7.h> |
| #include <osmocom/sigtran/protocol/m3ua.h> |
| #include <osmocom/gsm/gsm0808.h> |
| #include <osmocom/gsm/protocol/gsm_08_08.h> |
| #include <osmocom/gsm/protocol/gsm_04_08.h> |
| #include <osmocom/gsm/gsm0808_utils.h> |
| #include <osmocom/msc/debug.h> |
| #include <osmocom/msc/msc_ifaces.h> |
| #include <osmocom/msc/a_iface.h> |
| #include <osmocom/msc/a_iface_bssap.h> |
| #include <osmocom/msc/transaction.h> |
| #include <osmocom/mgcp_client/mgcp_client.h> |
| #include <osmocom/core/byteswap.h> |
| #include <osmocom/sccp/sccp_types.h> |
| #include <osmocom/msc/a_reset.h> |
| #include <osmocom/msc/vlr.h> |
| #include <osmocom/msc/ran_conn.h> |
| |
| #include <errno.h> |
| |
| #define LOGPCONN LOG_RAN_CONN |
| |
| /* A pointer to the GSM network we work with. By the current paradigm, |
| * there can only be one gsm_network per MSC. The pointer is set once |
| * when calling a_init() */ |
| static struct gsm_network *gsm_network = NULL; |
| |
| /* A struct to track currently active connections. We need that information |
| * to handle failure sitautions. In case of a problem, we must know which |
| * connections are currently open and which BSC is responsible. We also need |
| * the data to perform our connection checks (a_reset). All other logic will |
| * look at the connection ids and addresses that are supplied by the |
| * primitives */ |
| struct bsc_conn { |
| struct llist_head list; |
| uint32_t conn_id; /* Connection identifier */ |
| struct bsc_context *bsc; |
| }; |
| |
| /* Internal list with connections we currently maintain. This |
| * list is of type struct bsc_conn (see above) */ |
| static LLIST_HEAD(active_connections); |
| |
| /* Record info of a new active connection in the active connection list */ |
| static void record_bsc_con(const void *ctx, struct bsc_context *bsc, uint32_t conn_id) |
| { |
| struct bsc_conn *conn; |
| |
| conn = talloc_zero(ctx, struct bsc_conn); |
| OSMO_ASSERT(conn); |
| |
| conn->conn_id = conn_id; |
| conn->bsc = bsc; |
| |
| llist_add_tail(&conn->list, &active_connections); |
| } |
| |
| /* Delete info of a closed connection from the active connection list */ |
| void a_delete_bsc_con(uint32_t conn_id) |
| { |
| struct bsc_conn *conn; |
| struct bsc_conn *conn_temp; |
| |
| llist_for_each_entry_safe(conn, conn_temp, &active_connections, list) { |
| if (conn->conn_id == conn_id) { |
| LOGP(DBSSAP, LOGL_DEBUG, "(conn%u) Removing A-interface conn\n", conn->conn_id); |
| llist_del(&conn->list); |
| talloc_free(conn); |
| } |
| } |
| } |
| |
| /* Find a specified connection id */ |
| static struct bsc_conn *find_bsc_con(uint32_t conn_id) |
| { |
| struct bsc_conn *conn; |
| |
| /* Find the address for the current connection id */ |
| llist_for_each_entry(conn, &active_connections, list) { |
| if (conn->conn_id == conn_id) { |
| return conn; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| /* Check if a specified connection id has an active SCCP connection */ |
| static bool check_connection_active(uint32_t conn_id) |
| { |
| if (find_bsc_con(conn_id)) |
| return true; |
| else |
| return false; |
| } |
| |
| /* Get the context for a specific calling (BSC) address */ |
| static struct bsc_context *get_bsc_context_by_sccp_addr(const struct osmo_sccp_addr *addr) |
| { |
| struct bsc_context *bsc_ctx; |
| struct osmo_ss7_instance *ss7; |
| |
| if (!addr) |
| return NULL; |
| |
| llist_for_each_entry(bsc_ctx, &gsm_network->a.bscs, list) { |
| if (memcmp(&bsc_ctx->bsc_addr, addr, sizeof(*addr)) == 0) |
| return bsc_ctx; |
| } |
| |
| ss7 = osmo_ss7_instance_find(gsm_network->a.cs7_instance); |
| OSMO_ASSERT(ss7); |
| LOGP(DBSSAP, LOGL_NOTICE, "The calling BSC (%s) is unknown to this MSC ...\n", |
| osmo_sccp_addr_name(ss7, addr)); |
| return NULL; |
| } |
| |
| /* wrapper around osmo_sccp_tx_data_msg(): Transmit a fully encoded BSSAP (DTAP or BSSMAP) message */ |
| static int a_iface_tx_bssap(const struct ran_conn *conn, struct msgb *msg) |
| { |
| OSMO_ASSERT(conn); |
| OSMO_ASSERT(conn->a.scu); |
| |
| LOGPCONN(conn, LOGL_DEBUG, "N-DATA.req(%s)\n", msgb_hexdump_l3(msg)); |
| return osmo_sccp_tx_data_msg(conn->a.scu, conn->a.conn_id, msg); |
| } |
| |
| /* Send DTAP message via A-interface, take ownership of msg */ |
| int a_iface_tx_dtap(struct msgb *msg) |
| { |
| const struct ran_conn *conn; |
| struct msgb *msg_resp; |
| |
| uint8_t link_id = OMSC_LINKID_CB(msg); |
| OSMO_ASSERT(msg); |
| conn = (struct ran_conn *)msg->dst; |
| OSMO_ASSERT(conn); |
| |
| LOGPCONN(conn, LOGL_DEBUG, "Passing DTAP message (DLCI=0x%02x) from MSC to BSC\n", link_id); |
| |
| msg->l3h = msg->data; |
| msg_resp = gsm0808_create_dtap(msg, link_id); |
| |
| /* gsm0808_create_dtap() has copied the data to msg_resp, |
| * so msg has served its purpose now */ |
| msgb_free(msg); |
| |
| if (!msg_resp) { |
| LOGPCONN(conn, LOGL_ERROR, "Unable to generate BSSMAP DTAP message!\n"); |
| return -EINVAL; |
| } |
| |
| /* osmo_sccp_tx_data_msg() takes ownership of msg_resp */ |
| return a_iface_tx_bssap(conn, msg_resp); |
| } |
| |
| /* Send Cipher mode command via A-interface */ |
| int a_iface_tx_cipher_mode(const struct ran_conn *conn, |
| struct gsm0808_encrypt_info *ei, int include_imeisv) |
| { |
| /* TODO generalize for A- and Iu interfaces, don't name after 08.08 */ |
| struct msgb *msg_resp; |
| uint8_t crm = 0x01; |
| |
| OSMO_ASSERT(conn); |
| LOGPCONN(conn, LOGL_DEBUG, "Tx BSSMAP CIPHER MODE COMMAND to BSC, %u ciphers (%s)", |
| ei->perm_algo_len, osmo_hexdump_nospc(ei->perm_algo, ei->perm_algo_len)); |
| LOGPC(DBSSAP, LOGL_DEBUG, " key %s\n", osmo_hexdump_nospc(ei->key, ei->key_len)); |
| |
| msg_resp = gsm0808_create_cipher(ei, include_imeisv ? &crm : NULL); |
| return a_iface_tx_bssap(conn, msg_resp); |
| } |
| |
| /* Page a subscriber via A-interface */ |
| int a_iface_tx_paging(const char *imsi, uint32_t tmsi, uint16_t lac) |
| { |
| struct bsc_context *bsc_ctx; |
| struct gsm0808_cell_id_list2 cil; |
| struct msgb *msg; |
| int page_count = 0; |
| struct osmo_ss7_instance *ss7; |
| |
| OSMO_ASSERT(imsi); |
| |
| cil.id_discr = CELL_IDENT_LAC; |
| cil.id_list[0].lac = lac; |
| cil.id_list_len = 1; |
| |
| ss7 = osmo_ss7_instance_find(gsm_network->a.cs7_instance); |
| OSMO_ASSERT(ss7); |
| |
| /* Deliver paging request to all known BSCs */ |
| llist_for_each_entry(bsc_ctx, &gsm_network->a.bscs, list) { |
| if (a_reset_conn_ready(bsc_ctx->reset_fsm)) { |
| LOGP(DBSSAP, LOGL_DEBUG, |
| "Tx BSSMAP paging message from MSC %s to BSC %s (imsi=%s, tmsi=0x%08x, lac=%u)\n", |
| osmo_sccp_addr_name(ss7, &bsc_ctx->msc_addr), |
| osmo_sccp_addr_name(ss7, &bsc_ctx->bsc_addr), imsi, tmsi, lac); |
| msg = gsm0808_create_paging2(imsi, &tmsi, &cil, NULL); |
| osmo_sccp_tx_unitdata_msg(bsc_ctx->sccp_user, |
| &bsc_ctx->msc_addr, &bsc_ctx->bsc_addr, msg); |
| page_count++; |
| } else { |
| LOGP(DBSSAP, LOGL_DEBUG, |
| "Connection down, dropping paging from MSC %s to BSC %s (imsi=%s, tmsi=0x%08x, lac=%u)\n", |
| osmo_sccp_addr_name(ss7, &bsc_ctx->msc_addr), |
| osmo_sccp_addr_name(ss7, &bsc_ctx->bsc_addr), imsi, tmsi, lac); |
| } |
| } |
| |
| if (page_count <= 0) |
| LOGP(DBSSAP, LOGL_ERROR, "Could not deliver paging because none of the associated BSCs is available!\n"); |
| |
| return page_count; |
| } |
| |
| /* Convert speech version field */ |
| static uint8_t convert_speech_version_l3_to_A(int speech_ver) |
| { |
| /* The speech versions that are transmitted in the Bearer capability |
| * information element, that is transmitted on the Layer 3 (CC) |
| * use a different encoding than the permitted speech version |
| * identifier, that is signalled in the channel type element on the A |
| * interface. (See also 3GPP TS 48.008, 3.2.2.1 and 3GPP TS 24.008, |
| * 10.5.103 */ |
| |
| switch (speech_ver) { |
| case GSM48_BCAP_SV_FR: |
| return GSM0808_PERM_FR1; |
| case GSM48_BCAP_SV_HR: |
| return GSM0808_PERM_HR1; |
| case GSM48_BCAP_SV_EFR: |
| return GSM0808_PERM_FR2; |
| case GSM48_BCAP_SV_AMR_F: |
| return GSM0808_PERM_FR3; |
| case GSM48_BCAP_SV_AMR_H: |
| return GSM0808_PERM_HR3; |
| case GSM48_BCAP_SV_AMR_OFW: |
| return GSM0808_PERM_FR4; |
| case GSM48_BCAP_SV_AMR_OHW: |
| return GSM0808_PERM_HR4; |
| case GSM48_BCAP_SV_AMR_FW: |
| return GSM0808_PERM_FR5; |
| case GSM48_BCAP_SV_AMR_OH: |
| return GSM0808_PERM_HR6; |
| } |
| |
| /* If nothing matches, tag the result as invalid */ |
| LOGP(DBSSAP, LOGL_ERROR, "Invalid permitted speech version: %d\n", speech_ver); |
| return 0xFF; |
| } |
| |
| /* Convert speech preference field */ |
| static uint8_t convert_speech_pref_l3_to_A(int radio) |
| { |
| /* The Radio channel requirement field that is transmitted in the |
| * Bearer capability information element, that is transmitted on the |
| * Layer 3 (CC) uses a different encoding than the Channel rate and |
| * type field that is signalled in the channel type element on the A |
| * interface. (See also 3GPP TS 48.008, 3.2.2.1 and 3GPP TS 24.008, |
| * 10.5.102 */ |
| |
| switch (radio) { |
| case GSM48_BCAP_RRQ_FR_ONLY: |
| return GSM0808_SPEECH_FULL_BM; |
| case GSM48_BCAP_RRQ_DUAL_FR: |
| return GSM0808_SPEECH_FULL_PREF; |
| case GSM48_BCAP_RRQ_DUAL_HR: |
| return GSM0808_SPEECH_HALF_PREF; |
| } |
| |
| LOGP(DBSSAP, LOGL_ERROR, "Invalid radio channel preference: %d; defaulting to full rate.\n", |
| radio); |
| return GSM0808_SPEECH_FULL_BM; |
| } |
| |
| /* Assemble the channel type field */ |
| static int enc_channel_type(struct gsm0808_channel_type *ct, const struct gsm_mncc_bearer_cap *bc) |
| { |
| unsigned int i; |
| uint8_t sv; |
| unsigned int count = 0; |
| bool only_gsm_hr = true; |
| |
| OSMO_ASSERT(ct); |
| OSMO_ASSERT(bc); |
| |
| ct->ch_indctr = GSM0808_CHAN_SPEECH; |
| |
| for (i = 0; i < ARRAY_SIZE(bc->speech_ver); i++) { |
| if (bc->speech_ver[i] == -1) |
| break; |
| sv = convert_speech_version_l3_to_A(bc->speech_ver[i]); |
| if (sv != 0xFF) { |
| /* Detect if something else than |
| * GSM HR V1 is supported */ |
| if (sv == GSM0808_PERM_HR2 || |
| sv == GSM0808_PERM_HR3 || sv == GSM0808_PERM_HR4 || sv == GSM0808_PERM_HR6) |
| only_gsm_hr = false; |
| |
| ct->perm_spch[count] = sv; |
| count++; |
| } |
| } |
| ct->perm_spch_len = count; |
| |
| if (only_gsm_hr) |
| /* Note: We must avoid the usage of GSM HR1 as this |
| * codec only offers very poor audio quality. If the |
| * MS only supports GSM HR1 (and full rate), and has |
| * a preference for half rate. Then we will ignore the |
| * preference and assume a preference for full rate. */ |
| ct->ch_rate_type = GSM0808_SPEECH_FULL_BM; |
| else |
| ct->ch_rate_type = convert_speech_pref_l3_to_A(bc->radio); |
| |
| if (count) |
| return 0; |
| else |
| return -EINVAL; |
| } |
| |
| /* Assemble the speech codec field */ |
| static int enc_speech_codec_list(struct gsm0808_speech_codec_list *scl, const struct gsm0808_channel_type *ct) |
| { |
| unsigned int i; |
| int rc; |
| |
| memset(scl, 0, sizeof(*scl)); |
| for (i = 0; i < ct->perm_spch_len; i++) { |
| rc = gsm0808_speech_codec_from_chan_type(&scl->codec[i], ct->perm_spch[i]); |
| if (rc != 0) |
| return -EINVAL; |
| } |
| scl->len = i; |
| |
| return 0; |
| } |
| |
| /* Send assignment request via A-interface */ |
| int a_iface_tx_assignment(const struct gsm_trans *trans) |
| { |
| const struct ran_conn *conn; |
| struct gsm0808_channel_type ct; |
| struct gsm0808_speech_codec_list scl; |
| struct msgb *msg; |
| struct sockaddr_storage rtp_addr; |
| struct sockaddr_in rtp_addr_in; |
| int rc; |
| |
| OSMO_ASSERT(trans); |
| conn = trans->conn; |
| OSMO_ASSERT(conn); |
| |
| LOGPCONN(conn, LOGL_DEBUG, "Tx BSSMAP ASSIGNMENT COMMAND to BSC\n"); |
| |
| /* Channel type */ |
| rc = enc_channel_type(&ct, &trans->bearer_cap); |
| if (rc < 0) { |
| LOGPCONN(conn, LOGL_ERROR, "Not sending Assignment to BSC: failed to generate channel type\n"); |
| return -EINVAL; |
| } |
| |
| /* Speech codec list */ |
| rc = enc_speech_codec_list(&scl, &ct); |
| if (rc < 0) { |
| LOGPCONN(conn, LOGL_ERROR, "Not sending Assignment to BSC: failed to generate speech codec list\n"); |
| return -EINVAL; |
| } |
| |
| /* Package RTP-Address data */ |
| memset(&rtp_addr_in, 0, sizeof(rtp_addr_in)); |
| rtp_addr_in.sin_family = AF_INET; |
| rtp_addr_in.sin_port = osmo_htons(conn->rtp.local_port_ran); |
| rtp_addr_in.sin_addr.s_addr = inet_addr(conn->rtp.local_addr_ran); |
| |
| if (rtp_addr_in.sin_addr.s_addr == INADDR_NONE) { |
| LOGPCONN(conn, LOGL_ERROR, "Invalid RTP-Address -- assignment not sent!\n"); |
| return -EINVAL; |
| } |
| if (rtp_addr_in.sin_port == 0) { |
| LOGPCONN(conn, LOGL_ERROR, "Invalid RTP-Port -- assignment not sent!\n"); |
| return -EINVAL; |
| } |
| |
| memset(&rtp_addr, 0, sizeof(rtp_addr)); |
| memcpy(&rtp_addr, &rtp_addr_in, sizeof(rtp_addr_in)); |
| |
| msg = gsm0808_create_ass(&ct, NULL, &rtp_addr, &scl, NULL); |
| return a_iface_tx_bssap(conn, msg); |
| } |
| |
| /* Send clear command via A-interface */ |
| int a_iface_tx_clear_cmd(const struct ran_conn *conn) |
| { |
| struct msgb *msg; |
| struct vlr_subscr *vsub = conn->vsub; |
| bool csfb_ind = false; |
| |
| LOGPCONN(conn, LOGL_INFO, "Tx BSSMAP CLEAR COMMAND to BSC\n"); |
| |
| if (vsub && vsub->sgs_fsm->state == SGS_UE_ST_ASSOCIATED) |
| csfb_ind = true; |
| |
| msg = gsm0808_create_clear_command2(GSM0808_CAUSE_CALL_CONTROL, csfb_ind); |
| return a_iface_tx_bssap(conn, msg); |
| } |
| |
| int a_iface_tx_classmark_request(const struct ran_conn *conn) |
| { |
| struct msgb *msg; |
| |
| LOGPCONN(conn, LOGL_INFO, "Tx BSSMAP CLASSMARK REQUEST to BSC\n"); |
| |
| msg = gsm0808_create_classmark_request(); |
| return a_iface_tx_bssap(conn, msg); |
| } |
| |
| /* Callback function: Close all open connections */ |
| static void a_reset_cb(const void *priv) |
| { |
| struct msgb *msg; |
| struct bsc_context *bsc_ctx = (struct bsc_context*) priv; |
| struct osmo_ss7_instance *ss7; |
| |
| /* Skip if the A interface is not properly initalized yet */ |
| if (!gsm_network) |
| return; |
| |
| /* Clear all now orphaned RAN connections */ |
| a_clear_all(bsc_ctx->sccp_user, &bsc_ctx->bsc_addr); |
| |
| /* Send reset to the remote BSC */ |
| ss7 = osmo_ss7_instance_find(gsm_network->a.cs7_instance); |
| OSMO_ASSERT(ss7); |
| LOGP(DBSSAP, LOGL_NOTICE, "Tx BSSMAP RESET to BSC %s\n", osmo_sccp_addr_name(ss7, &bsc_ctx->bsc_addr)); |
| msg = gsm0808_create_reset(); |
| osmo_sccp_tx_unitdata_msg(bsc_ctx->sccp_user, &bsc_ctx->msc_addr, |
| &bsc_ctx->bsc_addr, msg); |
| } |
| |
| /* Add a new BSC connection to our internal list with known BSCs */ |
| static struct bsc_context *add_bsc(const struct osmo_sccp_addr *msc_addr, |
| const struct osmo_sccp_addr *bsc_addr, struct osmo_sccp_user *scu) |
| { |
| struct bsc_context *bsc_ctx; |
| struct osmo_ss7_instance *ss7; |
| |
| ss7 = osmo_ss7_instance_find(gsm_network->a.cs7_instance); |
| OSMO_ASSERT(ss7); |
| LOGP(DBSSAP, LOGL_NOTICE, "Adding new BSC connection for BSC %s...\n", osmo_sccp_addr_name(ss7, bsc_addr)); |
| |
| /* Generate and fill up a new bsc context */ |
| bsc_ctx = talloc_zero(gsm_network, struct bsc_context); |
| OSMO_ASSERT(bsc_ctx); |
| memcpy(&bsc_ctx->bsc_addr, bsc_addr, sizeof(*bsc_addr)); |
| memcpy(&bsc_ctx->msc_addr, msc_addr, sizeof(*msc_addr)); |
| bsc_ctx->sccp_user = scu; |
| llist_add_tail(&bsc_ctx->list, &gsm_network->a.bscs); |
| |
| return bsc_ctx; |
| } |
| |
| /* start the BSSMAP RESET fsm */ |
| void a_start_reset(struct bsc_context *bsc_ctx, bool already_connected) |
| { |
| char bsc_name[32]; |
| OSMO_ASSERT(bsc_ctx->reset_fsm == NULL); |
| /* Start reset procedure to make the new connection active */ |
| snprintf(bsc_name, sizeof(bsc_name), "bsc-%i", bsc_ctx->bsc_addr.pc); |
| bsc_ctx->reset_fsm = a_reset_alloc(bsc_ctx, bsc_name, a_reset_cb, bsc_ctx, already_connected); |
| } |
| |
| /* determine if given msg is BSSMAP RESET related (true) or not (false) */ |
| static bool bssmap_is_reset(struct msgb *msg) |
| { |
| struct bssmap_header *bs = (struct bssmap_header *)msgb_l2(msg); |
| |
| if (msgb_l2len(msg) < sizeof(*bs)) |
| return false; |
| |
| if (bs->type != BSSAP_MSG_BSS_MANAGEMENT) |
| return false; |
| |
| if (msg->l2h[sizeof(*bs)] == BSS_MAP_MSG_RESET) |
| return true; |
| |
| if (msg->l2h[sizeof(*bs)] == BSS_MAP_MSG_RESET_ACKNOWLEDGE) |
| return true; |
| |
| return false; |
| } |
| |
| /* Callback function, called by the SSCP stack when data arrives */ |
| static int sccp_sap_up(struct osmo_prim_hdr *oph, void *_scu) |
| { |
| struct osmo_sccp_user *scu = _scu; |
| struct osmo_scu_prim *scu_prim = (struct osmo_scu_prim *)oph; |
| int rc = 0; |
| struct a_conn_info a_conn_info; |
| struct bsc_conn *bsc_con; |
| |
| memset(&a_conn_info, 0, sizeof(a_conn_info)); |
| a_conn_info.network = gsm_network; |
| |
| switch (OSMO_PRIM_HDR(&scu_prim->oph)) { |
| case OSMO_PRIM(OSMO_SCU_PRIM_N_CONNECT, PRIM_OP_INDICATION): |
| /* Handle inbound connection indication */ |
| a_conn_info.conn_id = scu_prim->u.connect.conn_id; |
| a_conn_info.bsc = get_bsc_context_by_sccp_addr(&scu_prim->u.unitdata.calling_addr); |
| if (!a_conn_info.bsc) { |
| /* We haven't heard from this BSC before, allocate it */ |
| a_conn_info.bsc = add_bsc(&scu_prim->u.connect.called_addr, |
| &scu_prim->u.connect.calling_addr, scu); |
| a_start_reset(a_conn_info.bsc, false); |
| } else { |
| /* This BSC is already known to us, check if we have been through reset yet */ |
| if (a_reset_conn_ready(a_conn_info.bsc->reset_fsm) == false) { |
| LOGP(DBSSAP, LOGL_NOTICE, "Refusing N-CONNECT.ind(%u, %s), BSC not reset yet\n", |
| scu_prim->u.connect.conn_id, msgb_hexdump_l2(oph->msg)); |
| rc = osmo_sccp_tx_disconn(scu, a_conn_info.conn_id, &a_conn_info.bsc->msc_addr, |
| SCCP_RETURN_CAUSE_UNQUALIFIED); |
| break; |
| } |
| |
| osmo_sccp_tx_conn_resp(scu, scu_prim->u.connect.conn_id, &scu_prim->u.connect.called_addr, NULL, 0); |
| if (msgb_l2len(oph->msg) > 0) { |
| LOGP(DBSSAP, LOGL_DEBUG, "N-CONNECT.ind(%u, %s)\n", |
| scu_prim->u.connect.conn_id, msgb_hexdump_l2(oph->msg)); |
| rc = a_sccp_rx_dt(scu, &a_conn_info, oph->msg); |
| } else { |
| LOGP(DBSSAP, LOGL_DEBUG, "N-CONNECT.ind(%u)\n", scu_prim->u.connect.conn_id); |
| rc = -ENODATA; |
| } |
| |
| if (rc < 0) { |
| /* initial message (COMPL L3) caused some error, we didn't allocate |
| * a subscriber_conn and must close the connection again */ |
| rc = osmo_sccp_tx_disconn(scu, a_conn_info.conn_id, |
| &a_conn_info.bsc->msc_addr, |
| SCCP_RETURN_CAUSE_UNQUALIFIED); |
| } else |
| record_bsc_con(scu, a_conn_info.bsc, scu_prim->u.connect.conn_id); |
| } |
| break; |
| |
| case OSMO_PRIM(OSMO_SCU_PRIM_N_DATA, PRIM_OP_INDICATION): |
| /* Handle incoming connection oriented data */ |
| bsc_con = find_bsc_con(scu_prim->u.data.conn_id); |
| if (!bsc_con) { |
| LOGP(DBSSAP, LOGL_ERROR, "N-DATA.ind(%u, %s) for unknown conn_id\n", |
| scu_prim->u.data.conn_id, msgb_hexdump_l2(oph->msg)); |
| break; |
| } |
| a_conn_info.conn_id = scu_prim->u.data.conn_id; |
| a_conn_info.bsc = bsc_con->bsc; |
| LOGP(DBSSAP, LOGL_DEBUG, "N-DATA.ind(%u, %s)\n", |
| scu_prim->u.data.conn_id, msgb_hexdump_l2(oph->msg)); |
| a_sccp_rx_dt(scu, &a_conn_info, oph->msg); |
| break; |
| |
| case OSMO_PRIM(OSMO_SCU_PRIM_N_UNITDATA, PRIM_OP_INDICATION): |
| /* Handle inbound UNITDATA */ |
| |
| /* Get BSC context, create a new one if necessary */ |
| a_conn_info.bsc = get_bsc_context_by_sccp_addr(&scu_prim->u.unitdata.calling_addr); |
| if (!a_conn_info.bsc) { |
| /* We haven't heard from this BSC before, allocate it */ |
| a_conn_info.bsc = add_bsc(&scu_prim->u.unitdata.called_addr, |
| &scu_prim->u.unitdata.calling_addr, scu); |
| /* Make sure that reset procedure is started */ |
| a_start_reset(a_conn_info.bsc, false); |
| } |
| |
| /* As long as we are in the reset phase, only reset related BSSMAP messages may pass |
| * beond here. */ |
| if (!bssmap_is_reset(oph->msg) && a_reset_conn_ready(a_conn_info.bsc->reset_fsm) == false) { |
| LOGP(DBSSAP, LOGL_NOTICE, "Ignoring N-UNITDATA.ind(%s), BSC not reset yet\n", |
| msgb_hexdump_l2(oph->msg)); |
| break; |
| } |
| |
| DEBUGP(DBSSAP, "N-UNITDATA.ind(%s)\n", msgb_hexdump_l2(oph->msg)); |
| a_sccp_rx_udt(scu, &a_conn_info, oph->msg); |
| break; |
| |
| default: |
| LOGP(DBSSAP, LOGL_ERROR, "Unhandled SIGTRAN operation %s on primitive %u\n", |
| get_value_string(osmo_prim_op_names, oph->operation), oph->primitive); |
| break; |
| } |
| |
| /* We didn't transfer msgb ownership to any downstream functions so we rely on |
| * this single/central location to free() the msgb wrapping the primitive */ |
| msgb_free(oph->msg); |
| return rc; |
| } |
| |
| /* Clear all RAN connections on a specified BSC */ |
| void a_clear_all(struct osmo_sccp_user *scu, const struct osmo_sccp_addr *bsc_addr) |
| { |
| struct ran_conn *conn; |
| struct ran_conn *conn_temp; |
| struct gsm_network *network = gsm_network; |
| |
| OSMO_ASSERT(scu); |
| OSMO_ASSERT(bsc_addr); |
| |
| llist_for_each_entry_safe(conn, conn_temp, &network->ran_conns, entry) { |
| /* Clear only A connections and connections that actually |
| * belong to the specified BSC */ |
| if (conn->via_ran == OSMO_RAT_GERAN_A && memcmp(bsc_addr, &conn->a.bsc_addr, sizeof(conn->a.bsc_addr)) == 0) { |
| uint32_t conn_id = conn->a.conn_id; |
| LOGPCONN(conn, LOGL_NOTICE, "Dropping orphaned RAN connection\n"); |
| /* This call will/may talloc_free(conn), so we must save conn_id above */ |
| ran_conn_clear_request(conn, GSM48_CC_CAUSE_SWITCH_CONG); |
| |
| /* If there is still an SCCP connection active, remove it now */ |
| if (check_connection_active(conn_id)) { |
| osmo_sccp_tx_disconn(scu, conn_id, bsc_addr, |
| SCCP_RELEASE_CAUSE_END_USER_ORIGINATED); |
| a_delete_bsc_con(conn_id); |
| } |
| } |
| } |
| } |
| |
| /* Initalize A interface connection between to MSC and BSC */ |
| int a_init(struct osmo_sccp_instance *sccp, struct gsm_network *network) |
| { |
| OSMO_ASSERT(sccp); |
| OSMO_ASSERT(network); |
| |
| /* FIXME: Remove hardcoded parameters, use parameters in parameter list */ |
| LOGP(DBSSAP, LOGL_NOTICE, "Initalizing SCCP connection to stp...\n"); |
| |
| /* Set GSM network variable, there can only be |
| * one network by design */ |
| if (gsm_network != NULL) { |
| OSMO_ASSERT(gsm_network == network); |
| } else |
| gsm_network = network; |
| |
| /* SCCP Protocol stack */ |
| osmo_sccp_user_bind(sccp, "OsmoMSC-A", sccp_sap_up, SCCP_SSN_BSSAP); |
| |
| return 0; |
| } |