diff options
Diffstat (limited to 'openbsc/src/bssap.c')
| -rw-r--r-- | openbsc/src/bssap.c | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/openbsc/src/bssap.c b/openbsc/src/bssap.c index adf2cabcd..63bcc956b 100644 --- a/openbsc/src/bssap.c +++ b/openbsc/src/bssap.c @@ -44,6 +44,17 @@ static const struct tlv_definition bss_att_tlvdef = { [GSM0808_IE_CELL_IDENTIFIER_LIST] = { TLV_TYPE_TLV }, [GSM0808_IE_CHANNEL_NEEDED] = { TLV_TYPE_TV }, [GSM0808_IE_EMLPP_PRIORITY] = { TLV_TYPE_TV }, + [GSM0808_IE_CHANNEL_TYPE] = { TLV_TYPE_TLV }, + [GSM0808_IE_PRIORITY] = { TLV_TYPE_TLV }, + [GSM0808_IE_CIRCUIT_IDENTITY_CODE] = { TLV_TYPE_TV }, + [GSM0808_IE_DOWNLINK_DTX_FLAG] = { TLV_TYPE_TV }, + [GSM0808_IE_INTERFERENCE_BAND_TO_USE] = { TLV_TYPE_TV }, + [GSM0808_IE_CLASSMARK_INFORMATION_T2] = { TLV_TYPE_TLV }, + [GSM0808_IE_GROUP_CALL_REFERENCE] = { TLV_TYPE_TLV }, + [GSM0808_IE_TALKER_FLAG] = { TLV_TYPE_T }, + [GSM0808_IE_CONFIG_EVO_INDI] = { TLV_TYPE_TV }, + [GSM0808_IE_LSA_ACCESS_CTRL_SUPPR] = { TLV_TYPE_TV }, + [GSM0808_IE_SERVICE_HANDOVER] = { TLV_TYPE_TV}, }, }; @@ -151,6 +162,7 @@ static int bssmap_handle_clear_command(struct sccp_connection *conn, if (msg->lchan) { DEBUGP(DMSC, "Releasing all transactions on %p\n", conn); + bsc_del_timer(&msg->lchan->msc_data->T10); msg->lchan->msc_data->lchan = NULL; msg->lchan->msc_data = NULL; put_lchan(msg->lchan); @@ -210,6 +222,75 @@ reject: return -1; } +/* + * Handle the network configurable T10 parameter + */ +static void bssmap_t10_fired(void *_conn) +{ + struct sccp_connection *conn = (struct sccp_connection *) _conn; + struct msgb *resp; + + DEBUGP(DMSC, "T10 fired, assignment failed: %p\n", conn); + resp = bssmap_create_assignment_failure( + GSM0808_CAUSE_NO_RADIO_RESOURCE_AVAILABLE, NULL); + if (!resp) { + DEBUGP(DMSC, "Allocation failure: %p\n", conn); + return; + } + + bsc_queue_connection_write(conn, resp); +} + +/* + * Handle the assignment request message. + * + * See ยง3.2.1.1 for the message type + */ +static int bssmap_handle_assignm_req(struct sccp_connection *conn, + struct msgb *msg, unsigned int length) +{ + struct tlv_parsed tp; + struct bss_sccp_connection_data *msc_data; + int ret = 0; + + if (!msg->lchan || !msg->lchan->msc_data) { + DEBUGP(DMSC, "No lchan/msc_data in cipher mode command.\n"); + goto reject; + } + + msc_data = msg->lchan->msc_data; + tlv_parse(&tp, &bss_att_tlvdef, msg->l4h + 1, length - 1, 0, 0); + + if (!TLVP_PRESENT(&tp, GSM0808_IE_CHANNEL_TYPE)) { + DEBUGP(DMSC, "Mandantory channel type not present.\n"); + goto reject; + } + + if (!TLVP_PRESENT(&tp, GSM0808_IE_CIRCUIT_IDENTITY_CODE)) { + DEBUGP(DMSC, "Identity code missing. Audio routing will not work.\n"); + goto reject; + } + + /* + * currently only activation of speach on the + * existing channel is supported. This means we + * will send a Channel Modify message and take it + * from there. + * Setup channel type, timer + */ + //gsm48_lchan_modify(); + + msc_data->T10.cb = bssmap_t10_fired; + msc_data->T10.data = conn; + bsc_schedule_timer(&msc_data->T10, GSM0808_T10_VALUE); + return ret; + +reject: + gsm0808_send_assignment_failure(msg->lchan, + GSM0808_CAUSE_NO_RADIO_RESOURCE_AVAILABLE, NULL); + return -1; +} + int bssmap_rcvmsg_udt(struct gsm_network *net, struct msgb *msg, unsigned int length) { int ret = 0; @@ -247,6 +328,9 @@ int bssmap_rcvmsg_dt1(struct sccp_connection *conn, struct msgb *msg, unsigned i 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: DEBUGP(DMSC, "Unimplemented msg type: %d\n", msg->l4h[0]); break; @@ -442,6 +526,156 @@ struct msgb *bssmap_create_sapi_reject(u_int8_t link_id) return msg; } +static u_int8_t chan_mode_to_speech(enum gsm48_chan_mode mode) +{ + switch (mode) { + case GSM48_CMODE_SPEECH_V1: + return 1; + break; + case GSM48_CMODE_SPEECH_EFR: + return 0x11; + break; + case GSM48_CMODE_SPEECH_AMR: + return 0x21; + break; + case GSM48_CMODE_SIGN: + case GSM48_CMODE_DATA_14k5: + case GSM48_CMODE_DATA_12k0: + case GSM48_CMODE_DATA_6k0: + case GSM48_CMODE_DATA_3k6: + default: + DEBUGP(DMSC, "Using non speech mode: %d\n", mode); + return 0; + break; + } +} + +/* 3.2.2.33 */ +static u_int8_t lchan_to_chosen_channel(struct gsm_lchan *lchan) +{ + u_int8_t channel_mode = 0, channel = 0; + + switch (lchan->tch_mode) { + case GSM48_CMODE_SPEECH_V1: + case GSM48_CMODE_SPEECH_EFR: + case GSM48_CMODE_SPEECH_AMR: + channel_mode = 0x9; + break; + case GSM48_CMODE_SIGN: + channel_mode = 0x8; + break; + case GSM48_CMODE_DATA_14k5: + channel_mode = 0xe; + break; + case GSM48_CMODE_DATA_12k0: + channel_mode = 0xb; + break; + case GSM48_CMODE_DATA_6k0: + channel_mode = 0xc; + break; + case GSM48_CMODE_DATA_3k6: + channel_mode = 0xd; + break; + } + + switch (lchan->type) { + case GSM_LCHAN_NONE: + channel = 0x0; + break; + case GSM_LCHAN_SDCCH: + channel = 0x1; + break; + case GSM_LCHAN_TCH_F: + channel = 0x8; + break; + case GSM_LCHAN_TCH_H: + channel = 0x9; + break; + case GSM_LCHAN_UNKNOWN: + DEBUGP(DMSC, "Unknown lchan type: %p\n", lchan); + break; + } + + return channel_mode << 4 | channel; +} + +struct msgb *bssmap_create_assignment_completed(struct gsm_lchan *lchan, u_int8_t rr_cause) +{ + u_int8_t *data; + u_int8_t speech_mode; + + struct msgb *msg = msgb_alloc(35, "bssmap: ass compl"); + if (!msg) + return NULL; + + msg->l3h = msgb_put(msg, 3); + msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT; + msg->l3h[1] = 0xff; + msg->l3h[2] = BSS_MAP_MSG_ASSIGMENT_COMPLETE; + + /* write 3.2.2.22 */ + data = msgb_put(msg, 2); + data[0] = GSM0808_IE_RR_CAUSE; + data[1] = rr_cause; + + /* write cirtcuit identity code 3.2.2.2 */ + /* write cell identifier 3.2.2.17 */ + /* write chosen channel 3.2.2.33 when BTS picked it */ + data = msgb_put(msg, 2); + data[0] = GSM0808_IE_CHOSEN_CHANNEL; + data[1] = lchan_to_chosen_channel(lchan); + + /* write chosen encryption algorithm 3.2.2.44 */ + data = msgb_put(msg, 2); + data[0] = GSM0808_IE_CHOSEN_ENCR_ALG; + data[1] = RSL_ENC_ALG_A5(lchan->encr.alg_id); + + /* write circuit pool 3.2.2.45 */ + /* write speech version chosen: 3.2.2.51 when BTS picked it */ + speech_mode = chan_mode_to_speech(lchan->tch_mode); + if (speech_mode != 0) { + data = msgb_put(msg, 2); + data[0] = GSM0808_IE_SPEECH_VERSION; + data[1] = speech_mode; + } + + /* write LSA identifier 3.2.2.15 */ + + + /* update the size */ + msg->l3h[1] = msgb_l3len(msg) - 2; + return msg; +} + +struct msgb *bssmap_create_assignment_failure(u_int8_t cause, u_int8_t *rr_cause) +{ + u_int8_t *data; + struct msgb *msg = msgb_alloc(35, "bssmap: ass fail"); + if (!msg) + return NULL; + + msg->l3h = msgb_put(msg, 5); + msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT; + msg->l3h[1] = 0xff; + msg->l3h[2] = BSS_MAP_MSG_ASSIGMENT_FAILURE; + msg->l3h[3] = GSM0808_IE_CAUSE; + msg->l3h[4] = cause; + + /* RR cause 3.2.2.22 */ + if (rr_cause) { + data = msgb_put(msg, 2); + data[0] = GSM0808_IE_RR_CAUSE; + data[1] = *rr_cause; + } + + /* Circuit pool 3.22.45 */ + /* Circuit pool list 3.2.2.46 */ + + /* update the size */ + msg->l3h[1] = msgb_l3len(msg) - 2; + return msg; +} + struct msgb *dtap_create_msg(struct msgb *msg_l3, u_int8_t link_id) { struct dtap_header *header; @@ -484,6 +718,7 @@ static int bssap_handle_lchan_signal(unsigned int subsys, unsigned int signal, if (!lchan || !lchan->msc_data) return 0; + bsc_del_timer(&lchan->msc_data->T10); conn = lchan->msc_data->sccp; lchan->msc_data->lchan = NULL; lchan->msc_data = NULL; @@ -667,6 +902,34 @@ void bts_send_queued(struct bss_sccp_connection_data *data) data->gsm_queue_size = 0; } +void gsm0808_send_assignment_failure(struct gsm_lchan *lchan, u_int8_t cause, u_int8_t *rr_value) +{ + struct msgb *resp; + + bsc_del_timer(&lchan->msc_data->T10); + resp = bssmap_create_assignment_failure(cause, rr_value); + if (!resp) { + DEBUGP(DMSC, "Allocation failure: %p\n", lchan_get_sccp(lchan)); + return; + } + + bsc_queue_connection_write(lchan_get_sccp(lchan), resp); +} + +void gsm0808_send_assignment_compl(struct gsm_lchan *lchan, u_int8_t rr_cause) +{ + struct msgb *resp; + + bsc_del_timer(&lchan->msc_data->T10); + resp = bssmap_create_assignment_completed(lchan, rr_cause); + if (!resp) { + DEBUGP(DMSC, "Creating MSC response failed: %p\n", lchan_get_sccp(lchan)); + return; + } + + bsc_queue_connection_write(lchan_get_sccp(lchan), resp); +} + static __attribute__((constructor)) void on_dso_load_bssap(void) { register_signal_handler(SS_LCHAN, bssap_handle_lchan_signal, NULL); |