diff options
Diffstat (limited to 'src/osmo-bsc/osmo_bsc_bssap.c')
-rw-r--r-- | src/osmo-bsc/osmo_bsc_bssap.c | 721 |
1 files changed, 0 insertions, 721 deletions
diff --git a/src/osmo-bsc/osmo_bsc_bssap.c b/src/osmo-bsc/osmo_bsc_bssap.c deleted file mode 100644 index 9a5288bdc..000000000 --- a/src/osmo-bsc/osmo_bsc_bssap.c +++ /dev/null @@ -1,721 +0,0 @@ -/* GSM 08.08 BSSMAP handling */ -/* (C) 2009-2012 by Holger Hans Peter Freyther <zecke@selfish.org> - * (C) 2009-2012 by On-Waves - * All Rights Reserved - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU Affero General Public License as published by - * the Free Software Foundation; either version 3 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU Affero General Public License for more details. - * - * You should have received a copy of the GNU Affero General Public License - * along with this program. If not, see <http://www.gnu.org/licenses/>. - * - */ - -#include <openbsc/osmo_bsc.h> -#include <openbsc/osmo_bsc_grace.h> -#include <openbsc/osmo_bsc_rf.h> -#include <openbsc/bsc_msc_data.h> -#include <openbsc/debug.h> -#include <openbsc/bsc_subscriber.h> -#include <osmocom/legacy_mgcp/mgcp.h> -#include <openbsc/paging.h> - -#include <osmocom/gsm/protocol/gsm_08_08.h> -#include <osmocom/gsm/gsm0808.h> -#include <osmocom/gsm/gsm0808_utils.h> -#include <openbsc/osmo_bsc_sigtran.h> -#include <openbsc/a_reset.h> -#include <osmocom/core/byteswap.h> - -#define IP_V4_ADDR_LEN 4 - -/* - * helpers for the assignment command - */ - -/* Helper function for match_codec_pref(), looks up a matching permitted speech - * value for a given msc audio codec pref */ -enum gsm0808_permitted_speech audio_support_to_gsm88(struct gsm_audio_support - *audio) -{ - if (audio->hr) { - switch (audio->ver) { - case 1: - return GSM0808_PERM_HR1; - break; - case 2: - return GSM0808_PERM_HR2; - break; - case 3: - return GSM0808_PERM_HR3; - break; - default: - LOGP(DMSC, LOGL_ERROR, "Wrong speech mode: %d\n", - audio->ver); - return GSM0808_PERM_FR1; - } - } else { - switch (audio->ver) { - case 1: - return GSM0808_PERM_FR1; - break; - case 2: - return GSM0808_PERM_FR2; - break; - case 3: - return GSM0808_PERM_FR3; - break; - default: - LOGP(DMSC, LOGL_ERROR, "Wrong speech mode: %d\n", - audio->ver); - return GSM0808_PERM_HR1; - } - } -} - -/* Helper function for match_codec_pref(), looks up a matching chan mode for - * a given permitted speech value */ -enum gsm48_chan_mode gsm88_to_chan_mode(enum gsm0808_permitted_speech speech) -{ - switch (speech) { - case GSM0808_PERM_HR1: - case GSM0808_PERM_FR1: - return GSM48_CMODE_SPEECH_V1; - break; - case GSM0808_PERM_HR2: - case GSM0808_PERM_FR2: - return GSM48_CMODE_SPEECH_EFR; - break; - case GSM0808_PERM_HR3: - case GSM0808_PERM_FR3: - return GSM48_CMODE_SPEECH_AMR; - break; - default: - LOGP(DMSC, LOGL_FATAL, - "Unsupported permitted speech selected, assuming AMR as channel mode...\n"); - return GSM48_CMODE_SPEECH_AMR; - } -} - -/* Helper function for match_codec_pref(), tests if a given audio support - * matches one of the permitted speech settings of the channel type element. - * The matched permitted speech value is then also compared against the - * speech codec list. (optional, only relevant for AoIP) */ -static bool test_codec_pref(const struct gsm0808_channel_type *ct, - const struct gsm0808_speech_codec_list *scl, - uint8_t perm_spch) -{ - unsigned int i; - bool match = false; - struct gsm0808_speech_codec sc; - int rc; - - /* Try to finde the given permitted speech value in the - * codec list of the channel type element */ - for (i = 0; i < ct->perm_spch_len; i++) { - if (ct->perm_spch[i] == perm_spch) { - match = true; - break; - } - } - - /* If we do not have a speech codec list to test against, - * we just exit early (will be always the case in non-AoIP networks) */ - if (!scl) - return match; - - /* If we failed to match until here, there is no - * point in testing further */ - if (match == false) - return false; - - /* Extrapolate speech codec data */ - rc = gsm0808_speech_codec_from_chan_type(&sc, perm_spch); - if (rc < 0) - return false; - - /* Try to find extrapolated speech codec data in - * the speech codec list */ - for (i = 0; i < scl->len; i++) { - if (memcmp(&sc, &scl->codec[i], sizeof(sc)) == 0) - return true; - } - - return false; -} - -/* Helper function for bssmap_handle_assignm_req(), matches the codec - * preferences from the MSC with the codec preferences */ -static int match_codec_pref(int *full_rate, enum gsm48_chan_mode *chan_mode, - const struct gsm0808_channel_type *ct, - const struct gsm0808_speech_codec_list *scl, - const struct bsc_msc_data *msc) -{ - unsigned int i; - uint8_t perm_spch; - bool match = false; - - for (i = 0; i < msc->audio_length; i++) { - perm_spch = audio_support_to_gsm88(msc->audio_support[i]); - if (test_codec_pref(ct, scl, perm_spch)) { - match = true; - break; - } - } - - /* Exit without result, in case no match can be deteched */ - if (!match) { - *full_rate = -1; - *chan_mode = GSM48_CMODE_SIGN; - return -1; - } - - /* Check if the result is a half or full rate codec */ - if (perm_spch == GSM0808_PERM_HR1 || perm_spch == GSM0808_PERM_HR2 - || perm_spch == GSM0808_PERM_HR3 || perm_spch == GSM0808_PERM_HR4 - || perm_spch == GSM0808_PERM_HR6) - *full_rate = 0; - else - *full_rate = 1; - - /* Lookup a channel mode for the selected codec */ - *chan_mode = gsm88_to_chan_mode(perm_spch); - - return 0; -} - -static int bssmap_handle_reset_ack(struct bsc_msc_data *msc, - struct msgb *msg, unsigned int length) -{ - LOGP(DMSC, LOGL_NOTICE, "RESET ACK from MSC: %s\n", - osmo_sccp_addr_name(osmo_ss7_instance_find(msc->a.cs7_instance), - &msc->a.msc_addr)); - - /* Inform the FSM that controls the RESET/RESET-ACK procedure - * that we have successfully received the reset-ack message */ - a_reset_ack_confirm(msc->a.reset); - - return 0; -} - -/* Handle MSC sided reset */ -static int bssmap_handle_reset(struct bsc_msc_data *msc, - struct msgb *msg, unsigned int length) -{ - LOGP(DMSC, LOGL_NOTICE, "RESET from MSC: %s\n", - osmo_sccp_addr_name(osmo_ss7_instance_find(msc->a.cs7_instance), - &msc->a.msc_addr)); - - /* Instruct the bsc to close all open sigtran connections and to - * close all active channels on the BTS side as well */ - osmo_bsc_sigtran_reset(msc); - - /* Inform the MSC that we have received the reset request and - * that we acted accordingly */ - osmo_bsc_sigtran_tx_reset_ack(msc); - - return 0; -} - -/* GSM 08.08 § 3.2.1.19 */ -static int bssmap_handle_paging(struct bsc_msc_data *msc, - struct msgb *msg, unsigned int payload_length) -{ - struct bsc_subscr *subscr; - struct tlv_parsed tp; - char mi_string[GSM48_MI_SIZE]; - uint32_t tmsi = GSM_RESERVED_TMSI; - unsigned int lac = GSM_LAC_RESERVED_ALL_BTS; - uint8_t data_length; - const uint8_t *data; - uint8_t chan_needed = RSL_CHANNEED_ANY; - - tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l4h + 1, payload_length - 1, 0, 0); - - if (!TLVP_PRESENT(&tp, GSM0808_IE_IMSI)) { - LOGP(DMSC, LOGL_ERROR, "Mandatory IMSI not present.\n"); - return -1; - } else if ((TLVP_VAL(&tp, GSM0808_IE_IMSI)[0] & GSM_MI_TYPE_MASK) != GSM_MI_TYPE_IMSI) { - LOGP(DMSC, LOGL_ERROR, "Wrong content in the IMSI\n"); - return -1; - } - - if (!TLVP_PRESENT(&tp, GSM0808_IE_CELL_IDENTIFIER_LIST)) { - LOGP(DMSC, LOGL_ERROR, "Mandatory CELL IDENTIFIER LIST not present.\n"); - return -1; - } - - if (TLVP_PRESENT(&tp, GSM0808_IE_TMSI) && - TLVP_LEN(&tp, GSM0808_IE_TMSI) == 4) { - tmsi = ntohl(tlvp_val32_unal(&tp, GSM0808_IE_TMSI)); - } - - /* - * parse the IMSI - */ - gsm48_mi_to_string(mi_string, sizeof(mi_string), - TLVP_VAL(&tp, GSM0808_IE_IMSI), TLVP_LEN(&tp, GSM0808_IE_IMSI)); - - /* - * parse the cell identifier list - */ - data_length = TLVP_LEN(&tp, GSM0808_IE_CELL_IDENTIFIER_LIST); - data = TLVP_VAL(&tp, GSM0808_IE_CELL_IDENTIFIER_LIST); - - /* - * Support paging to all network or one BTS at one LAC - */ - if (data_length == 3 && data[0] == CELL_IDENT_LAC) { - lac = osmo_load16be(&data[1]); - } else if (data_length > 1 || (data[0] & 0x0f) != CELL_IDENT_BSS) { - LOGP(DMSC, LOGL_ERROR, "Unsupported Cell Identifier List: %s\n", osmo_hexdump(data, data_length)); - return -1; - } - - if (TLVP_PRESENT(&tp, GSM0808_IE_CHANNEL_NEEDED) && TLVP_LEN(&tp, GSM0808_IE_CHANNEL_NEEDED) == 1) - chan_needed = TLVP_VAL(&tp, GSM0808_IE_CHANNEL_NEEDED)[0] & 0x03; - - if (TLVP_PRESENT(&tp, GSM0808_IE_EMLPP_PRIORITY)) { - LOGP(DMSC, LOGL_ERROR, "eMLPP is not handled\n"); - } - - subscr = bsc_subscr_find_or_create_by_imsi(msc->network->bsc_subscribers, - mi_string); - if (!subscr) { - LOGP(DMSC, LOGL_ERROR, "Failed to allocate a subscriber for %s\n", mi_string); - return -1; - } - - subscr->lac = lac; - subscr->tmsi = tmsi; - - LOGP(DMSC, LOGL_INFO, "Paging request from MSC IMSI: '%s' TMSI: '0x%x/%u' LAC: 0x%x\n", mi_string, tmsi, tmsi, lac); - bsc_grace_paging_request(msc->network->bsc_data->rf_ctrl->policy, - subscr, chan_needed, msc); - return 0; -} - -/* - * GSM 08.08 § 3.1.9.1 and 3.2.1.21... - * release our gsm_subscriber_connection and send message - */ -static int bssmap_handle_clear_command(struct osmo_bsc_sccp_con *conn, - struct msgb *msg, unsigned int payload_length) -{ - struct msgb *resp; - - /* TODO: handle the cause of this package */ - - if (conn->conn) { - LOGP(DMSC, LOGL_INFO, "Releasing all transactions on %p\n", conn); - gsm0808_clear(conn->conn); - bsc_subscr_con_free(conn->conn); - conn->conn = NULL; - } - - /* send the clear complete message */ - resp = gsm0808_create_clear_complete(); - if (!resp) { - LOGP(DMSC, LOGL_ERROR, "Sending clear complete failed.\n"); - return -1; - } - - osmo_bsc_sigtran_send(conn, resp); - return 0; -} - -/* - * GSM 08.08 § 3.4.7 cipher mode handling. We will have to pick - * the cipher to be used for this. In case we are already using - * a cipher we will have to send cipher mode reject to the MSC, - * otherwise we will have to pick something that we and the MS - * is supporting. Currently we are doing it in a rather static - * way by picking one ecnryption or no encrytpion. - */ -static int bssmap_handle_cipher_mode(struct osmo_bsc_sccp_con *conn, - struct msgb *msg, unsigned int payload_length) -{ - uint16_t len; - struct gsm_network *network = NULL; - const uint8_t *data; - struct tlv_parsed tp; - struct msgb *resp; - int reject_cause = -1; - int include_imeisv = 1; - - if (!conn->conn) { - LOGP(DMSC, LOGL_ERROR, "No lchan/msc_data in cipher mode command.\n"); - goto reject; - } - - if (conn->ciphering_handled) { - LOGP(DMSC, LOGL_ERROR, "Already seen ciphering command. Protocol Error.\n"); - goto reject; - } - - conn->ciphering_handled = 1; - - tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l4h + 1, payload_length - 1, 0, 0); - if (!TLVP_PRESENT(&tp, GSM0808_IE_ENCRYPTION_INFORMATION)) { - LOGP(DMSC, LOGL_ERROR, "IE Encryption Information missing.\n"); - goto reject; - } - - /* - * check if our global setting is allowed - * - Currently we check for A5/0 and A5/1 - * - Copy the key if that is necessary - * - Otherwise reject - */ - len = TLVP_LEN(&tp, GSM0808_IE_ENCRYPTION_INFORMATION); - if (len < 1) { - LOGP(DMSC, LOGL_ERROR, "IE Encryption Information is too short.\n"); - goto reject; - } - - network = conn->conn->bts->network; - data = TLVP_VAL(&tp, GSM0808_IE_ENCRYPTION_INFORMATION); - - if (TLVP_PRESENT(&tp, GSM0808_IE_CIPHER_RESPONSE_MODE)) - include_imeisv = TLVP_VAL(&tp, GSM0808_IE_CIPHER_RESPONSE_MODE)[0] & 0x1; - - if (network->a5_encryption == 0 && (data[0] & 0x1) == 0x1) { - gsm0808_cipher_mode(conn->conn, 0, NULL, 0, include_imeisv); - } else if (network->a5_encryption != 0 && (data[0] & 0x2) == 0x2) { - gsm0808_cipher_mode(conn->conn, 1, &data[1], len - 1, include_imeisv); - } else { - LOGP(DMSC, LOGL_ERROR, "Can not select encryption...\n"); - goto reject; - } - - return 0; - -reject: - resp = gsm0808_create_cipher_reject(reject_cause); - if (!resp) { - LOGP(DMSC, LOGL_ERROR, "Sending the cipher reject failed.\n"); - return -1; - } - - osmo_bsc_sigtran_send(conn, resp); - return -1; -} - -/* - * Handle the assignment request message. - * - * See §3.2.1.1 for the message type - */ -static int bssmap_handle_assignm_req(struct osmo_bsc_sccp_con *conn, - struct msgb *msg, unsigned int length) -{ - struct msgb *resp; - struct bsc_msc_data *msc; - struct tlv_parsed tp; - uint8_t timeslot = 0; - uint8_t multiplex = 0; - enum gsm48_chan_mode chan_mode = GSM48_CMODE_SIGN; - int port, full_rate = -1; - bool aoip = false; - struct sockaddr_storage rtp_addr; - struct sockaddr_in *rtp_addr_in; - struct gsm0808_channel_type ct; - struct gsm0808_speech_codec_list scl; - struct gsm0808_speech_codec_list *scl_ptr = NULL; - int rc; - const uint8_t *data; - char len; - - if (!conn->conn) { - LOGP(DMSC, LOGL_ERROR, - "No lchan/msc_data in cipher mode command.\n"); - return -1; - } - - msc = conn->msc; - - tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l4h + 1, length - 1, 0, 0); - - /* Check for channel type element, if its missing, immediately reject */ - if (!TLVP_PRESENT(&tp, GSM0808_IE_CHANNEL_TYPE)) { - LOGP(DMSC, LOGL_ERROR, "Mandatory channel type not present.\n"); - goto reject; - } - - /* Detect if a CIC code is present, if so, we use the classic ip.access - * method to calculate the RTP port */ - if (TLVP_PRESENT(&tp, GSM0808_IE_CIRCUIT_IDENTITY_CODE)) { - conn->cic = - osmo_load16be(TLVP_VAL - (&tp, GSM0808_IE_CIRCUIT_IDENTITY_CODE)); - timeslot = conn->cic & 0x1f; - multiplex = (conn->cic & ~0x1f) >> 5; - } else if (TLVP_PRESENT(&tp, GSM0808_IE_AOIP_TRASP_ADDR)) { - /* Decode AoIP transport address element */ - data = TLVP_VAL(&tp, GSM0808_IE_AOIP_TRASP_ADDR); - len = TLVP_LEN(&tp, GSM0808_IE_AOIP_TRASP_ADDR); - rc = gsm0808_dec_aoip_trasp_addr(&rtp_addr, data, len); - if (rc < 0) { - LOGP(DMSC, LOGL_ERROR, - "Unable to decode aoip transport address.\n"); - goto reject; - } - aoip = true; - } else { - LOGP(DMSC, LOGL_ERROR, - "transport address missing. Audio routing will not work.\n"); - goto reject; - } - - /* Decode speech codec list (AoIP) */ - if (aoip) { - /* Check for speech codec list element */ - if (!TLVP_PRESENT(&tp, GSM0808_IE_SPEECH_CODEC_LIST)) { - LOGP(DMSC, LOGL_ERROR, - "Mandatory speech codec list not present.\n"); - goto reject; - } - - /* Decode Speech Codec list */ - data = TLVP_VAL(&tp, GSM0808_IE_SPEECH_CODEC_LIST); - len = TLVP_LEN(&tp, GSM0808_IE_SPEECH_CODEC_LIST); - rc = gsm0808_dec_speech_codec_list(&scl, data, len); - if (rc < 0) { - LOGP(DMSC, LOGL_ERROR, - "Unable to decode speech codec list\n"); - goto reject; - } - scl_ptr = &scl; - } - - /* Decode Channel Type element */ - data = TLVP_VAL(&tp, GSM0808_IE_CHANNEL_TYPE); - len = TLVP_LEN(&tp, GSM0808_IE_CHANNEL_TYPE); - rc = gsm0808_dec_channel_type(&ct, data, len); - if (rc < 0) { - LOGP(DMSC, LOGL_ERROR, "unable to decode channel type.\n"); - goto reject; - } - - /* Currently we only support a limited subset of all - * possible channel types. The limitation ends by not using - * multi-slot, limiting the channel coding to speech */ - if (ct.ch_indctr != GSM0808_CHAN_SPEECH) { - LOGP(DMSC, LOGL_ERROR, - "Unsupported channel type, currently only speech is supported!\n"); - goto reject; - } - - /* Match codec information from the assignment command against the - * local preferences of the BSC */ - rc = match_codec_pref(&full_rate, &chan_mode, &ct, scl_ptr, msc); - if (rc < 0) { - LOGP(DMSC, LOGL_ERROR, "No supported audio type found.\n"); - goto reject; - } - - if (aoip == false) { - /* map it to a MGCP Endpoint and a RTP port */ - port = mgcp_timeslot_to_endpoint(multiplex, timeslot); - conn->rtp_port = rtp_calculate_port(port, msc->rtp_base); - conn->rtp_ip = 0; - } else { - /* 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; - conn->rtp_port = osmo_ntohs(rtp_addr_in->sin_port); - memcpy(&conn->rtp_ip, &rtp_addr_in->sin_addr.s_addr, - IP_V4_ADDR_LEN); - conn->rtp_ip = osmo_ntohl(conn->rtp_ip); - } else { - LOGP(DMSC, LOGL_ERROR, - "Unsopported addressing scheme. (supports only IPV4)\n"); - goto reject; - } - } - - return gsm0808_assign_req(conn->conn, chan_mode, full_rate); - -reject: - resp = - gsm0808_create_assignment_failure - (GSM0808_CAUSE_NO_RADIO_RESOURCE_AVAILABLE, NULL); - if (!resp) { - LOGP(DMSC, LOGL_ERROR, "Channel allocation failure.\n"); - return -1; - } - - osmo_bsc_sigtran_send(conn, resp); - return -1; -} - -static int bssmap_rcvmsg_udt(struct bsc_msc_data *msc, - struct msgb *msg, unsigned int length) -{ - int ret = 0; - - if (length < 1) { - LOGP(DMSC, LOGL_ERROR, "Not enough room: %d\n", length); - return -1; - } - - LOGP(DMSC, LOGL_INFO, "Rx MSC UDT BSSMAP %s\n", - gsm0808_bssmap_name(msg->l4h[0])); - - switch (msg->l4h[0]) { - case BSS_MAP_MSG_RESET_ACKNOWLEDGE: - ret = bssmap_handle_reset_ack(msc, msg, length); - break; - case BSS_MAP_MSG_RESET: - ret = bssmap_handle_reset(msc, msg, length); - break; - case BSS_MAP_MSG_PAGING: - ret = bssmap_handle_paging(msc, msg, length); - break; - } - - return ret; -} - -static int bssmap_rcvmsg_dt1(struct osmo_bsc_sccp_con *conn, - struct msgb *msg, unsigned int length) -{ - int ret = 0; - - if (length < 1) { - LOGP(DMSC, LOGL_ERROR, "Not enough room: %d\n", length); - return -1; - } - - LOGP(DMSC, LOGL_INFO, "Rx MSC DT1 BSSMAP %s\n", - gsm0808_bssmap_name(msg->l4h[0])); - - switch (msg->l4h[0]) { - case BSS_MAP_MSG_CLEAR_CMD: - ret = bssmap_handle_clear_command(conn, msg, length); - break; - case BSS_MAP_MSG_CIPHER_MODE_CMD: - ret = bssmap_handle_cipher_mode(conn, msg, length); - break; - case BSS_MAP_MSG_ASSIGMENT_RQST: - ret = bssmap_handle_assignm_req(conn, msg, length); - break; - default: - LOGP(DMSC, LOGL_NOTICE, "Unimplemented msg type: %s\n", - gsm0808_bssmap_name(msg->l4h[0])); - break; - } - - return ret; -} - -static int dtap_rcvmsg(struct osmo_bsc_sccp_con *conn, - struct msgb *msg, unsigned int length) -{ - struct dtap_header *header; - struct msgb *gsm48; - uint8_t *data; - int rc, dtap_rc; - - LOGP(DMSC, LOGL_DEBUG, "Rx MSC DTAP: %s\n", - osmo_hexdump(msg->l3h, length)); - - if (!conn->conn) { - LOGP(DMSC, LOGL_ERROR, "No subscriber connection available\n"); - return -1; - } - - header = (struct dtap_header *) msg->l3h; - if (sizeof(*header) >= length) { - LOGP(DMSC, LOGL_ERROR, "The DTAP header does not fit. Wanted: %zu got: %u\n", sizeof(*header), length); - LOGP(DMSC, LOGL_ERROR, "hex: %s\n", osmo_hexdump(msg->l3h, length)); - return -1; - } - - if (header->length > length - sizeof(*header)) { - LOGP(DMSC, LOGL_ERROR, "The DTAP l4 information does not fit: header: %u length: %u\n", header->length, length); - LOGP(DMSC, LOGL_ERROR, "hex: %s\n", osmo_hexdump(msg->l3h, length)); - return -1; - } - - LOGP(DMSC, LOGL_INFO, "Rx MSC DTAP, SAPI: %u CHAN: %u\n", header->link_id & 0x07, header->link_id & 0xC0); - - /* forward the data */ - gsm48 = gsm48_msgb_alloc_name("GSM 04.08 DTAP RCV"); - if (!gsm48) { - LOGP(DMSC, LOGL_ERROR, "Allocation of the message failed.\n"); - return -1; - } - - gsm48->l3h = gsm48->data; - data = msgb_put(gsm48, length - sizeof(*header)); - memcpy(data, msg->l3h + sizeof(*header), length - sizeof(*header)); - - /* pass it to the filter for extra actions */ - rc = bsc_scan_msc_msg(conn->conn, gsm48); - dtap_rc = gsm0808_submit_dtap(conn->conn, gsm48, header->link_id, 1); - if (rc == BSS_SEND_USSD) - bsc_send_welcome_ussd(conn->conn); - return dtap_rc; -} - -int bsc_handle_udt(struct bsc_msc_data *msc, - struct msgb *msgb, unsigned int length) -{ - struct bssmap_header *bs; - - LOGP(DMSC, LOGL_DEBUG, "Rx MSC UDT: %s\n", - osmo_hexdump(msgb->l3h, length)); - - if (length < sizeof(*bs)) { - LOGP(DMSC, LOGL_ERROR, "The header is too short.\n"); - return -1; - } - - bs = (struct bssmap_header *) msgb->l3h; - if (bs->length < length - sizeof(*bs)) - return -1; - - switch (bs->type) { - case BSSAP_MSG_BSS_MANAGEMENT: - msgb->l4h = &msgb->l3h[sizeof(*bs)]; - bssmap_rcvmsg_udt(msc, msgb, length - sizeof(*bs)); - break; - default: - LOGP(DMSC, LOGL_NOTICE, "Unimplemented msg type: %s\n", - gsm0808_bssmap_name(bs->type)); - } - - return 0; -} - -int bsc_handle_dt(struct osmo_bsc_sccp_con *conn, - struct msgb *msg, unsigned int len) -{ - if (len < sizeof(struct bssmap_header)) { - LOGP(DMSC, LOGL_ERROR, "The header is too short.\n"); - } - - switch (msg->l3h[0]) { - case BSSAP_MSG_BSS_MANAGEMENT: - msg->l4h = &msg->l3h[sizeof(struct bssmap_header)]; - bssmap_rcvmsg_dt1(conn, msg, len - sizeof(struct bssmap_header)); - break; - case BSSAP_MSG_DTAP: - dtap_rcvmsg(conn, msg, len); - break; - default: - LOGP(DMSC, LOGL_NOTICE, "Unimplemented BSSAP msg type: %s\n", - gsm0808_bssap_name(msg->l3h[0])); - } - - return -1; -} |