| /* (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/sccp/sccp_types.h> |
| #include <osmocom/gsm/gsm0808.h> |
| #include <osmocom/gsm/gsm48.h> |
| #include <osmocom/gsm/gsm0808_utils.h> |
| #include <osmocom/msc/debug.h> |
| #include <osmocom/msc/gsm_data.h> |
| #include <osmocom/msc/a_iface_bssap.h> |
| #include <osmocom/msc/a_iface.h> |
| #include <osmocom/msc/osmo_msc.h> |
| #include <osmocom/core/byteswap.h> |
| #include <osmocom/msc/a_reset.h> |
| #include <osmocom/msc/transaction.h> |
| #include <osmocom/msc/msc_mgcp.h> |
| |
| #include <errno.h> |
| |
| #define IP_V4_ADDR_LEN 4 |
| |
| /* |
| * Helper functions to lookup and allocate subscribers |
| */ |
| |
| /* Allocate a new subscriber connection */ |
| static struct gsm_subscriber_connection *subscr_conn_allocate_a(const struct a_conn_info *a_conn_info, |
| struct gsm_network *network, |
| uint16_t lac, struct osmo_sccp_user *scu, int conn_id) |
| { |
| struct gsm_subscriber_connection *conn; |
| |
| LOGP(DMSC, LOGL_DEBUG, "Allocating A-Interface subscriber conn: lac %i, conn_id %i\n", lac, conn_id); |
| |
| conn = talloc_zero(network, struct gsm_subscriber_connection); |
| if (!conn) |
| return NULL; |
| |
| conn->network = network; |
| conn->via_ran = RAN_GERAN_A; |
| conn->lac = lac; |
| |
| conn->a.conn_id = conn_id; |
| conn->a.scu = scu; |
| |
| /* Also backup the calling address of the BSC, this allows us to |
| * identify later which BSC is responsible for this subscriber connection */ |
| memcpy(&conn->a.bsc_addr, &a_conn_info->bsc->bsc_addr, sizeof(conn->a.bsc_addr)); |
| |
| llist_add_tail(&conn->entry, &network->subscr_conns); |
| LOGPCONN(conn, LOGL_DEBUG, "A-Interface subscriber connection successfully allocated!\n"); |
| return conn; |
| } |
| |
| /* Return an existing A subscriber connection record for the given |
| * connection IDs, or return NULL if not found. */ |
| static struct gsm_subscriber_connection *subscr_conn_lookup_a(const struct gsm_network *network, int conn_id) |
| { |
| struct gsm_subscriber_connection *conn; |
| |
| OSMO_ASSERT(network); |
| |
| DEBUGP(DMSC, "Looking for A subscriber: conn_id %i\n", conn_id); |
| |
| /* FIXME: log_subscribers() is defined in iucs.c as static inline, if |
| * maybe this function should be public to reach it from here? */ |
| /* log_subscribers(network); */ |
| |
| llist_for_each_entry(conn, &network->subscr_conns, entry) { |
| if (conn->via_ran == RAN_GERAN_A && conn->a.conn_id == conn_id) { |
| LOGPCONN(conn, LOGL_DEBUG, "Found A subscriber for conn_id %i\n", conn_id); |
| return conn; |
| } |
| } |
| DEBUGP(DMSC, "No A subscriber found for conn_id %i\n", conn_id); |
| return NULL; |
| } |
| |
| /* |
| * BSSMAP handling for UNITDATA |
| */ |
| |
| /* Endpoint to handle BSSMAP reset */ |
| static void bssmap_rx_reset(struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg) |
| { |
| struct gsm_network *network = a_conn_info->network; |
| struct osmo_ss7_instance *ss7; |
| |
| ss7 = osmo_ss7_instance_find(network->a.cs7_instance); |
| OSMO_ASSERT(ss7); |
| |
| LOGP(DBSSAP, LOGL_NOTICE, "Rx BSSMAP RESET from BSC %s, sending RESET ACK\n", |
| osmo_sccp_addr_name(ss7, &a_conn_info->bsc->bsc_addr)); |
| osmo_sccp_tx_unitdata_msg(scu, &a_conn_info->bsc->msc_addr, &a_conn_info->bsc->bsc_addr, |
| gsm0808_create_reset_ack()); |
| |
| /* Make sure all orphand subscriber connections will be cleard */ |
| a_clear_all(scu, &a_conn_info->bsc->bsc_addr); |
| |
| if (!a_conn_info->bsc->reset) |
| a_start_reset(a_conn_info->bsc, true); |
| } |
| |
| /* Endpoint to handle BSSMAP reset acknowlegement */ |
| static void bssmap_rx_reset_ack(const struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, |
| struct msgb *msg) |
| { |
| |
| struct gsm_network *network = a_conn_info->network; |
| struct osmo_ss7_instance *ss7; |
| |
| ss7 = osmo_ss7_instance_find(network->a.cs7_instance); |
| OSMO_ASSERT(ss7); |
| |
| if (a_conn_info->bsc->reset == NULL) { |
| LOGP(DBSSAP, LOGL_ERROR, "Received RESET ACK from an unknown BSC %s, ignoring...\n", |
| osmo_sccp_addr_name(ss7, &a_conn_info->bsc->bsc_addr)); |
| return; |
| } |
| |
| LOGP(DBSSAP, LOGL_NOTICE, "Received RESET ACK from BSC %s\n", |
| osmo_sccp_addr_name(ss7, &a_conn_info->bsc->bsc_addr)); |
| |
| /* Confirm that we managed to get the reset ack message |
| * towards the connection reset logic */ |
| a_reset_ack_confirm(a_conn_info->bsc->reset); |
| } |
| |
| /* Handle UNITDATA BSSMAP messages */ |
| static void bssmap_rcvmsg_udt(struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg) |
| { |
| /* Note: When in the MSC role, RESET ACK is the only valid message that |
| * can be received via UNITDATA */ |
| |
| if (msgb_l3len(msg) < 1) { |
| LOGP(DBSSAP, LOGL_NOTICE, "Error: No data received -- discarding message!\n"); |
| return; |
| } |
| |
| LOGP(DBSSAP, LOGL_DEBUG, "Rx BSSMAP UDT %s\n", gsm0808_bssmap_name(msg->l3h[0])); |
| |
| switch (msg->l3h[0]) { |
| case BSS_MAP_MSG_RESET: |
| bssmap_rx_reset(scu, a_conn_info, msg); |
| break; |
| case BSS_MAP_MSG_RESET_ACKNOWLEDGE: |
| bssmap_rx_reset_ack(scu, a_conn_info, msg); |
| break; |
| default: |
| LOGP(DBSSAP, LOGL_NOTICE, "Unimplemented message format: %s -- message discarded!\n", |
| gsm0808_bssmap_name(msg->l3h[0])); |
| } |
| } |
| |
| /* Receive incoming connection less data messages via sccp */ |
| void a_sccp_rx_udt(struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg) |
| { |
| /* Note: The only valid message type that can be received |
| * via UNITDATA are BSS Management messages */ |
| struct bssmap_header *bs; |
| |
| OSMO_ASSERT(scu); |
| OSMO_ASSERT(a_conn_info); |
| OSMO_ASSERT(msg); |
| |
| LOGP(DBSSAP, LOGL_DEBUG, "Rx BSSMAP UDT: %s\n", msgb_hexdump_l2(msg)); |
| |
| if (msgb_l2len(msg) < sizeof(*bs)) { |
| LOGP(DBSSAP, LOGL_ERROR, "Error: Header is too short -- discarding message!\n"); |
| return; |
| } |
| |
| bs = (struct bssmap_header *)msgb_l2(msg); |
| if (bs->length < msgb_l2len(msg) - sizeof(*bs)) { |
| LOGP(DBSSAP, LOGL_ERROR, "Error: Message is too short -- discarding message!\n"); |
| return; |
| } |
| |
| switch (bs->type) { |
| case BSSAP_MSG_BSS_MANAGEMENT: |
| msg->l3h = &msg->l2h[sizeof(struct bssmap_header)]; |
| bssmap_rcvmsg_udt(scu, a_conn_info, msg); |
| break; |
| default: |
| LOGP(DBSSAP, LOGL_ERROR, |
| "Error: Unimplemented message type: %s -- message discarded!\n", gsm0808_bssmap_name(bs->type)); |
| } |
| } |
| |
| /* |
| * BSSMAP handling for connection oriented data |
| */ |
| |
| /* Endpoint to handle BSSMAP clear request */ |
| static int bssmap_rx_clear_rqst(struct gsm_subscriber_connection *conn, |
| struct msgb *msg, struct tlv_parsed *tp) |
| { |
| int rc; |
| struct msgb *msg_resp; |
| uint8_t cause; |
| |
| LOGPCONN(conn, LOGL_INFO, "Rx BSSMAP CLEAR REQUEST\n"); |
| |
| if (!TLVP_PRESENT(tp, GSM0808_IE_CAUSE)) { |
| LOGP(DBSSAP, LOGL_ERROR, "Cause code is missing -- discarding message!\n"); |
| return -EINVAL; |
| } |
| cause = TLVP_VAL(tp, GSM0808_IE_CAUSE)[0]; |
| |
| /* Respond with clear command */ |
| msg_resp = gsm0808_create_clear_command(GSM0808_CAUSE_CALL_CONTROL); |
| rc = osmo_sccp_tx_data_msg(conn->a.scu, conn->a.conn_id, msg_resp); |
| |
| msc_clear_request(conn, cause); |
| |
| return rc; |
| } |
| |
| /* Endpoint to handle BSSMAP clear complete */ |
| static int bssmap_rx_clear_complete(struct osmo_sccp_user *scu, |
| const struct a_conn_info *a_conn_info, struct msgb *msg) |
| { |
| int rc; |
| |
| LOGP(DMSC, LOGL_INFO, "Rx BSSMAP CLEAR COMPLETE, releasing SCCP connection\n"); |
| rc = osmo_sccp_tx_disconn(scu, a_conn_info->conn_id, |
| NULL, SCCP_RELEASE_CAUSE_END_USER_ORIGINATED); |
| |
| /* Remove the record from the list with active connections. */ |
| a_delete_bsc_con(a_conn_info->conn_id); |
| |
| return rc; |
| } |
| |
| /* Endpoint to handle layer 3 complete messages */ |
| static int bssmap_rx_l3_compl(struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, |
| struct msgb *msg, struct tlv_parsed *tp) |
| { |
| struct { |
| uint8_t ident; |
| struct gsm48_loc_area_id lai; |
| uint16_t ci; |
| } __attribute__ ((packed)) lai_ci; |
| uint16_t mcc; |
| uint16_t mnc; |
| uint16_t lac; |
| uint8_t data_length; |
| const uint8_t *data; |
| int rc; |
| |
| struct gsm_network *network = a_conn_info->network; |
| struct gsm_subscriber_connection *conn; |
| |
| LOGP(DBSSAP, LOGL_INFO, "Rx BSSMAP COMPLETE L3 INFO (conn_id=%i)\n", a_conn_info->conn_id); |
| |
| if (!TLVP_PRESENT(tp, GSM0808_IE_CELL_IDENTIFIER)) { |
| LOGP(DBSSAP, LOGL_ERROR, "Mandatory CELL IDENTIFIER not present -- discarding message!\n"); |
| return -EINVAL; |
| } |
| if (!TLVP_PRESENT(tp, GSM0808_IE_LAYER_3_INFORMATION)) { |
| LOGP(DBSSAP, LOGL_ERROR, "Mandatory LAYER 3 INFORMATION not present -- discarding message!\n"); |
| return -EINVAL; |
| } |
| |
| /* Parse Cell ID element */ |
| /* FIXME: Encapsulate this in a parser/generator function inside |
| * libosmocore, add support for all specified cell identification |
| * discriminators (see 3GPP ts 3.2.2.17 Cell Identifier) */ |
| data_length = TLVP_LEN(tp, GSM0808_IE_CELL_IDENTIFIER); |
| data = TLVP_VAL(tp, GSM0808_IE_CELL_IDENTIFIER); |
| if (sizeof(lai_ci) != data_length) { |
| LOGP(DBSSAP, LOGL_ERROR, |
| "Unable to parse element CELL IDENTIFIER (wrong field length) -- discarding message!\n"); |
| return -EINVAL; |
| } |
| memcpy(&lai_ci, data, sizeof(lai_ci)); |
| if (lai_ci.ident != CELL_IDENT_WHOLE_GLOBAL) { |
| LOGP(DBSSAP, LOGL_ERROR, |
| "Unable to parse element CELL IDENTIFIER (wrong cell identification discriminator) -- discarding message!\n"); |
| return -EINVAL; |
| } |
| if (gsm48_decode_lai(&lai_ci.lai, &mcc, &mnc, &lac) != 0) { |
| LOGP(DBSSAP, LOGL_ERROR, |
| "Unable to parse element CELL IDENTIFIER (lai decoding failed) -- discarding message!\n"); |
| return -EINVAL; |
| } |
| |
| /* Parse Layer 3 Information element */ |
| /* FIXME: This is probably to hackish, compiler also complains "assignment discards ‘const’ qualifier..." */ |
| msg->l3h = (uint8_t*)TLVP_VAL(tp, GSM0808_IE_LAYER_3_INFORMATION); |
| msg->tail = msg->l3h + TLVP_LEN(tp, GSM0808_IE_LAYER_3_INFORMATION); |
| |
| /* Create new subscriber context */ |
| conn = subscr_conn_allocate_a(a_conn_info, network, lac, scu, a_conn_info->conn_id); |
| |
| /* Handover location update to the MSC code */ |
| rc = msc_compl_l3(conn, msg, 0); |
| |
| if (rc == MSC_CONN_ACCEPT) { |
| LOGP(DMSC, LOGL_INFO, "User has been accepted by MSC.\n"); |
| return 0; |
| } else if (rc == MSC_CONN_REJECT) |
| LOGP(DMSC, LOGL_INFO, "User has been rejected by MSC.\n"); |
| else |
| LOGP(DMSC, LOGL_INFO, "User has been rejected by MSC (unknown error)\n"); |
| |
| return -EINVAL; |
| } |
| |
| /* Endpoint to handle BSSMAP classmark update */ |
| static int bssmap_rx_classmark_upd(struct gsm_subscriber_connection *conn, struct msgb *msg, |
| struct tlv_parsed *tp) |
| { |
| const uint8_t *cm2 = NULL; |
| const uint8_t *cm3 = NULL; |
| uint8_t cm2_len = 0; |
| uint8_t cm3_len = 0; |
| |
| LOGPCONN(conn, LOGL_DEBUG, "Rx BSSMAP CLASSMARK UPDATE\n"); |
| |
| if (!TLVP_PRESENT(tp, GSM0808_IE_CLASSMARK_INFORMATION_T2)) { |
| LOGPCONN(conn, LOGL_ERROR, "Mandatory Classmark Information Type 2 not present -- discarding message!\n"); |
| return -EINVAL; |
| } |
| |
| cm2 = TLVP_VAL(tp, GSM0808_IE_CLASSMARK_INFORMATION_T2); |
| cm2_len = TLVP_LEN(tp, GSM0808_IE_CLASSMARK_INFORMATION_T2); |
| |
| if (TLVP_PRESENT(tp, GSM0808_IE_CLASSMARK_INFORMATION_T3)) { |
| cm3 = TLVP_VAL(tp, GSM0808_IE_CLASSMARK_INFORMATION_T3); |
| cm3_len = TLVP_LEN(tp, GSM0808_IE_CLASSMARK_INFORMATION_T3); |
| } |
| |
| /* Inform MSC about the classmark change */ |
| msc_classmark_chg(conn, cm2, cm2_len, cm3, cm3_len); |
| |
| return 0; |
| } |
| |
| /* Endpoint to handle BSSMAP cipher mode complete */ |
| static int bssmap_rx_ciph_compl(struct gsm_subscriber_connection *conn, struct msgb *msg, |
| struct tlv_parsed *tp) |
| { |
| /* FIXME: The field GSM0808_IE_LAYER_3_MESSAGE_CONTENTS is optional by |
| * means of the specification. So there can be messages without L3 info. |
| * In this case, the code will crash becrause msc_cipher_mode_compl() |
| * is not able to deal with msg = NULL and apperently |
| * msc_cipher_mode_compl() was never meant to be used without L3 data. |
| * This needs to be discussed further! */ |
| |
| uint8_t alg_id = 1; |
| |
| LOGPCONN(conn, LOGL_DEBUG, "Rx BSSMAP CIPHER MODE COMPLETE\n"); |
| |
| if (TLVP_PRESENT(tp, GSM0808_IE_CHOSEN_ENCR_ALG)) { |
| alg_id = TLVP_VAL(tp, GSM0808_IE_CHOSEN_ENCR_ALG)[0] - 1; |
| } |
| |
| if (TLVP_PRESENT(tp, GSM0808_IE_LAYER_3_MESSAGE_CONTENTS)) { |
| msg->l3h = (uint8_t*)TLVP_VAL(tp, GSM0808_IE_LAYER_3_MESSAGE_CONTENTS); |
| msg->tail = msg->l3h + TLVP_LEN(tp, GSM0808_IE_LAYER_3_MESSAGE_CONTENTS); |
| } else { |
| msg = NULL; |
| } |
| |
| /* Hand over cipher mode complete message to the MSC */ |
| msc_cipher_mode_compl(conn, msg, alg_id); |
| |
| return 0; |
| } |
| |
| /* Endpoint to handle BSSMAP cipher mode reject */ |
| static int bssmap_rx_ciph_rej(struct gsm_subscriber_connection *conn, |
| struct msgb *msg, struct tlv_parsed *tp) |
| { |
| uint8_t cause; |
| |
| LOGPCONN(conn, LOGL_NOTICE, "RX BSSMAP CIPHER MODE REJECT\n"); |
| |
| if (!TLVP_PRESENT(tp, BSS_MAP_MSG_CIPHER_MODE_REJECT)) { |
| LOGPCONN(conn, LOGL_ERROR, "Cause code is missing -- discarding message!\n"); |
| return -EINVAL; |
| } |
| |
| cause = TLVP_VAL(tp, BSS_MAP_MSG_CIPHER_MODE_REJECT)[0]; |
| LOGPCONN(conn, LOGL_NOTICE, "Cipher mode rejection cause: %i\n", cause); |
| |
| /* FIXME: Can we do something meaningful here? e.g. report to the |
| * msc code somehow that the cipher mode command has failed. */ |
| |
| return 0; |
| } |
| |
| /* Endpoint to handle BSSMAP assignment failure */ |
| static int bssmap_rx_ass_fail(struct gsm_subscriber_connection *conn, struct msgb *msg, |
| struct tlv_parsed *tp) |
| { |
| uint8_t cause; |
| uint8_t *rr_cause_ptr = NULL; |
| uint8_t rr_cause; |
| |
| LOGPCONN(conn, LOGL_NOTICE, "Rx BSSMAP ASSIGNMENT FAILURE message\n"); |
| |
| if (!TLVP_PRESENT(tp, GSM0808_IE_CAUSE)) { |
| LOGPCONN(conn, LOGL_ERROR, "Cause code is missing -- discarding message!\n"); |
| return -EINVAL; |
| } |
| cause = TLVP_VAL(tp, GSM0808_IE_CAUSE)[0]; |
| |
| if (TLVP_PRESENT(tp, GSM0808_IE_RR_CAUSE)) { |
| rr_cause = TLVP_VAL(tp, GSM0808_IE_RR_CAUSE)[0]; |
| rr_cause_ptr = &rr_cause; |
| } |
| |
| /* FIXME: In AoIP, the Assignment failure will carry also an optional |
| * Codec List (BSS Supported) element. It has to be discussed if we |
| * can ignore this element. If not, The msc_assign_fail() function |
| * call has to change. However msc_assign_fail() does nothing in the |
| * end. So probably we can just leave it as it is. Even for AoIP */ |
| |
| /* Inform the MSC about the assignment failure event */ |
| msc_assign_fail(conn, cause, rr_cause_ptr); |
| |
| return 0; |
| } |
| |
| /* Endpoint to handle sapi "n" reject */ |
| static int bssmap_rx_sapi_n_rej(struct gsm_subscriber_connection *conn, struct msgb *msg, |
| struct tlv_parsed *tp) |
| { |
| uint8_t dlci; |
| |
| LOGPCONN(conn, LOGL_NOTICE, "Rx BSSMAP SAPI-N-REJECT message\n"); |
| |
| /* Note: The MSC code seems not to care about the cause code, but by |
| * the specification it is mandatory, so we check its presence. See |
| * also 3GPP TS 48.008 3.2.1.34 SAPI "n" REJECT */ |
| if (!TLVP_PRESENT(tp, GSM0808_IE_CAUSE)) { |
| LOGPCONN(conn, LOGL_ERROR, "Cause code is missing -- discarding message!\n"); |
| return -EINVAL; |
| } |
| if (!TLVP_PRESENT(tp, GSM0808_IE_DLCI)) { |
| LOGPCONN(conn, LOGL_ERROR, "DLCI is missing -- discarding message!\n"); |
| return -EINVAL; |
| } |
| dlci = TLVP_VAL(tp, GSM0808_IE_DLCI)[0]; |
| |
| /* Inform the MSC about the sapi "n" reject event */ |
| msc_sapi_n_reject(conn, dlci); |
| |
| return 0; |
| } |
| |
| /* Endpoint to handle assignment complete */ |
| static int bssmap_rx_ass_compl(struct gsm_subscriber_connection *conn, struct msgb *msg, |
| struct tlv_parsed *tp) |
| { |
| struct mgcp_client *mgcp; |
| struct sockaddr_storage rtp_addr; |
| struct sockaddr_in *rtp_addr_in; |
| int rc; |
| |
| mgcp = conn->network->mgw.client; |
| OSMO_ASSERT(mgcp); |
| |
| LOGPCONN(conn, LOGL_INFO, "Rx BSSMAP ASSIGNMENT COMPLETE message\n"); |
| |
| if (!TLVP_PRESENT(tp, GSM0808_IE_AOIP_TRASP_ADDR)) { |
| LOGPCONN(conn, LOGL_ERROR, "AoIP transport identifier missing -- discarding message!\n"); |
| return -EINVAL; |
| } |
| |
| /* Decode AoIP transport address element */ |
| rc = gsm0808_dec_aoip_trasp_addr(&rtp_addr, TLVP_VAL(tp, GSM0808_IE_AOIP_TRASP_ADDR), |
| TLVP_LEN(tp, GSM0808_IE_AOIP_TRASP_ADDR)); |
| if (rc < 0) { |
| LOGPCONN(conn, LOGL_ERROR, "Unable to decode aoip transport address.\n"); |
| return -EINVAL; |
| } |
| |
| /* use address / port supplied with the AoIP |
| * transport address element */ |
| if (rtp_addr.ss_family == AF_INET) { |
| rtp_addr_in = (struct sockaddr_in *)&rtp_addr; |
| msc_mgcp_ass_complete(conn, osmo_ntohs(rtp_addr_in->sin_port), inet_ntoa(rtp_addr_in->sin_addr)); |
| } else { |
| LOGPCONN(conn, LOGL_ERROR, "Unsopported addressing scheme. (supports only IPV4)\n"); |
| return -EINVAL; |
| } |
| |
| /* FIXME: Seems to be related to authentication or, |
| encryption. Is this really in the right place? */ |
| msc_rx_sec_mode_compl(conn); |
| |
| return 0; |
| } |
| |
| /* Handle incoming connection oriented BSSMAP messages */ |
| static int rx_bssmap(struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg) |
| { |
| struct gsm_subscriber_connection *conn; |
| struct tlv_parsed tp; |
| int rc; |
| |
| if (msgb_l3len(msg) < 1) { |
| LOGP(DBSSAP, LOGL_NOTICE, "Error: No data received -- discarding message!\n"); |
| return -1; |
| } |
| |
| rc = tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 1, msgb_l3len(msg) - 1, 0, 0); |
| if (rc < 0) { |
| LOGP(DBSSAP, LOGL_ERROR, "Failed parsing TLV -- discarding message! %s\n", |
| osmo_hexdump(msg->l3h, msgb_l3len(msg))); |
| return -EINVAL; |
| } |
| |
| /* Only message types allowed without a 'conn' */ |
| switch (msg->l3h[0]) { |
| case BSS_MAP_MSG_COMPLETE_LAYER_3: |
| return bssmap_rx_l3_compl(scu, a_conn_info, msg, &tp); |
| case BSS_MAP_MSG_CLEAR_COMPLETE: |
| return bssmap_rx_clear_complete(scu, a_conn_info, msg); |
| default: |
| break; |
| } |
| |
| conn = subscr_conn_lookup_a(a_conn_info->network, a_conn_info->conn_id); |
| if (!conn) { |
| LOGP(DBSSAP, LOGL_ERROR, "Couldn't find subscr_conn for conn_id=%d\n", a_conn_info->conn_id); |
| return -EINVAL; |
| } |
| |
| LOGPCONN(conn, LOGL_DEBUG, "Rx BSSMAP DT1 %s\n", gsm0808_bssmap_name(msg->l3h[0])); |
| |
| switch (msg->l3h[0]) { |
| case BSS_MAP_MSG_CLEAR_RQST: |
| return bssmap_rx_clear_rqst(conn, msg, &tp); |
| case BSS_MAP_MSG_CLASSMARK_UPDATE: |
| return bssmap_rx_classmark_upd(conn, msg, &tp); |
| case BSS_MAP_MSG_CIPHER_MODE_COMPLETE: |
| return bssmap_rx_ciph_compl(conn, msg, &tp); |
| case BSS_MAP_MSG_CIPHER_MODE_REJECT: |
| return bssmap_rx_ciph_rej(conn, msg, &tp); |
| case BSS_MAP_MSG_ASSIGMENT_FAILURE: |
| return bssmap_rx_ass_fail(conn, msg, &tp); |
| case BSS_MAP_MSG_SAPI_N_REJECT: |
| return bssmap_rx_sapi_n_rej(conn, msg, &tp); |
| case BSS_MAP_MSG_ASSIGMENT_COMPLETE: |
| return bssmap_rx_ass_compl(conn, msg, &tp); |
| default: |
| LOGPCONN(conn, LOGL_ERROR, "Unimplemented msg type: %s\n", gsm0808_bssmap_name(msg->l3h[0])); |
| return -EINVAL; |
| } |
| |
| return -EINVAL; |
| } |
| |
| /* Endpoint to handle regular BSSAP DTAP messages. No ownership of 'msg' is passed on! */ |
| static int rx_dtap(const struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg) |
| { |
| struct gsm_network *network = a_conn_info->network; |
| struct gsm_subscriber_connection *conn; |
| |
| conn = subscr_conn_lookup_a(network, a_conn_info->conn_id); |
| if (!conn) { |
| return -EINVAL; |
| } |
| |
| LOGPCONN(conn, LOGL_DEBUG, "Rx DTAP %s\n", msgb_hexdump_l2(msg)); |
| |
| /* msc_dtap expects the dtap payload in l3h */ |
| msg->l3h = msg->l2h + 3; |
| |
| /* Forward dtap payload into the msc */ |
| msc_dtap(conn, conn->a.conn_id, msg); |
| |
| return 0; |
| } |
| |
| /* Handle incoming connection oriented messages. No ownership of 'msg' is passed on! */ |
| int a_sccp_rx_dt(struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg) |
| { |
| OSMO_ASSERT(scu); |
| OSMO_ASSERT(a_conn_info); |
| OSMO_ASSERT(msg); |
| |
| if (msgb_l2len(msg) < sizeof(struct bssmap_header)) { |
| LOGP(DBSSAP, LOGL_NOTICE, "The header is too short -- discarding message!\n"); |
| return -EINVAL; |
| } |
| |
| switch (msg->l2h[0]) { |
| case BSSAP_MSG_BSS_MANAGEMENT: |
| msg->l3h = &msg->l2h[sizeof(struct bssmap_header)]; |
| return rx_bssmap(scu, a_conn_info, msg); |
| case BSSAP_MSG_DTAP: |
| return rx_dtap(scu, a_conn_info, msg); |
| default: |
| LOGP(DBSSAP, LOGL_ERROR, "Unimplemented BSSAP msg type: %s\n", gsm0808_bssap_name(msg->l2h[0])); |
| return -EINVAL; |
| } |
| |
| return -EINVAL; |
| } |