/* osmo-bsc BSSMAP Assignment procedure implementation. * * (C) 2018 by sysmocom - s.f.m.c. GmbH * All Rights Reserved * * Author: Neels Hofmeyr * * 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 . * */ #include #include #include #include #include #include #include #include #include #include #include #include #include static struct osmo_fsm assignment_fsm; struct gsm_subscriber_connection *assignment_fi_conn(struct osmo_fsm_inst *fi) { OSMO_ASSERT(fi); OSMO_ASSERT(fi->fsm == &assignment_fsm); OSMO_ASSERT(fi->priv); return fi->priv; } static const struct osmo_tdef_state_timeout assignment_fsm_timeouts[32] = { [ASSIGNMENT_ST_WAIT_LCHAN_ACTIVE] = { .T=10 }, [ASSIGNMENT_ST_WAIT_RR_ASS_COMPLETE] = { .keep_timer=true }, [ASSIGNMENT_ST_WAIT_LCHAN_ESTABLISHED] = { .keep_timer=true }, [ASSIGNMENT_ST_WAIT_MGW_ENDPOINT_TO_MSC] = { .T=23042 }, }; /* Transition to a state, using the T timer defined in assignment_fsm_timeouts. * The actual timeout value is in turn obtained from network->T_defs. * Assumes local variable fi exists. */ #define assignment_fsm_state_chg(state) \ osmo_tdef_fsm_inst_state_chg(fi, state, \ assignment_fsm_timeouts, \ ((struct gsm_subscriber_connection*)(fi->priv))->network->T_defs, \ 5) /* Log failure and transition to ASSIGNMENT_ST_FAILURE, which triggers the appropriate actions. */ #define assignment_fail(cause, fmt, args...) do { \ struct gsm_subscriber_connection *_conn = fi->priv; \ _conn->assignment.failure_cause = cause; \ LOG_ASSIGNMENT(_conn, LOGL_ERROR, "Assignment failed in state %s, cause %s: " fmt "\n", \ osmo_fsm_inst_state_name(fi), gsm0808_cause_name(cause), ## args); \ assignment_count_result(BSC_CTR_ASSIGNMENT_ERROR); \ on_assignment_failure(_conn); \ } while(0) /* Assume presence of local var 'conn' as struct gsm_subscriber_connection */ #define assignment_count(counter) do { \ LOG_ASSIGNMENT(conn, LOGL_DEBUG, "incrementing rate counter: %s %s\n", \ bsc_ctr_description[counter].name, \ bsc_ctr_description[counter].description); \ rate_ctr_inc(&conn->network->bsc_ctrs->ctr[counter]); \ } while(0) #define assignment_count_result(counter) do { \ if (!conn->assignment.result_rate_ctr_done) { \ assignment_count(counter); \ conn->assignment.result_rate_ctr_done = true; \ } else \ LOG_ASSIGNMENT(conn, LOGL_DEBUG, \ "result rate counter already recorded, NOT counting as: %s %s\n", \ bsc_ctr_description[counter].name, \ bsc_ctr_description[counter].description); \ } while(0) void assignment_reset(struct gsm_subscriber_connection *conn) { if (conn->assignment.new_lchan) { struct gsm_lchan *lchan = conn->assignment.new_lchan; conn->assignment.new_lchan = NULL; lchan_release(lchan, false, true, RSL_ERR_EQUIPMENT_FAIL); } if (conn->assignment.created_ci_for_msc) { gscon_forget_mgw_endpoint_ci(conn, conn->assignment.created_ci_for_msc); /* If this is the last endpoint released, the mgw_endpoint_fsm will terminate and tell * the gscon about it. */ osmo_mgcpc_ep_ci_dlcx(conn->assignment.created_ci_for_msc); } conn->assignment = (struct assignment_fsm_data){ .fi = conn->assignment.fi, /* The FSM shall clear itself when it's done. */ }; } static void on_assignment_failure(struct gsm_subscriber_connection *conn) { struct msgb *resp = gsm0808_create_assignment_failure(conn->assignment.failure_cause, NULL); if (!resp) LOG_ASSIGNMENT(conn, LOGL_ERROR, "Unable to compose BSSMAP Assignment Failure message\n"); else gscon_sigtran_send(conn, resp); /* If assignment failed as early as in assignment_fsm_start(), there may not be an fi yet. */ if (conn->assignment.fi) { LOG_ASSIGNMENT(conn, LOGL_ERROR, "Assignment failed\n"); osmo_fsm_inst_term(conn->assignment.fi, OSMO_FSM_TERM_ERROR, 0); } } static void _gsm0808_ass_compl_extend_osmux(struct msgb *msg, uint8_t cid) { OSMO_ASSERT(msg->l3h[1] == msgb_l3len(msg) - 2); /*TL not in len */ msgb_tv_put(msg, GSM0808_IE_OSMO_OSMUX_CID, cid); msg->l3h[1] = msgb_l3len(msg) - 2; } static void send_assignment_complete(struct gsm_subscriber_connection *conn) { int rc; struct gsm0808_speech_codec sc; struct gsm0808_speech_codec *sc_ptr = NULL; struct sockaddr_storage addr_local; struct sockaddr_storage *addr_local_p = NULL; uint8_t osmux_cid = 0; int perm_spch = 0; uint8_t chosen_channel; struct msgb *resp; struct gsm_lchan *lchan = conn->lchan; struct osmo_fsm_inst *fi = conn->fi; chosen_channel = gsm0808_chosen_channel(lchan->type, lchan->tch_mode); if (!chosen_channel) { assignment_fail(GSM0808_CAUSE_EQUIPMENT_FAILURE, "Unable to compose Chosen Channel for mode=%s type=%s", get_value_string(gsm48_chan_mode_names, lchan->tch_mode), gsm_lchant_name(lchan->type)); return; } /* Generate voice related fields */ if (conn->assignment.requires_voice_stream) { perm_spch = gsm0808_permitted_speech(lchan->type, lchan->tch_mode); if (gscon_is_aoip(conn)) { if (!osmo_mgcpc_ep_ci_get_crcx_info_to_sockaddr(conn->user_plane.mgw_endpoint_ci_msc, &addr_local)) { assignment_fail(GSM0808_CAUSE_EQUIPMENT_FAILURE, "Unable to compose RTP address of MGW -> MSC"); return; } addr_local_p = &addr_local; } if (gscon_is_aoip(conn) && conn->assignment.req.use_osmux) { if (!osmo_mgcpc_ep_ci_get_crcx_info_to_osmux_cid(conn->user_plane.mgw_endpoint_ci_msc, &osmux_cid)) { assignment_fail(GSM0808_CAUSE_EQUIPMENT_FAILURE, "Unable to compose Osmux CID of MGW -> MSC"); return; } } /* Only AoIP networks include a speech codec (choosen) in the * assignment complete message. */ if (gscon_is_aoip(conn)) { /* Extrapolate speech codec from speech mode */ gsm0808_speech_codec_from_chan_type(&sc, perm_spch); sc.cfg = conn->lchan->activate.info.s15_s0; sc_ptr = ≻ } } resp = gsm0808_create_ass_compl2(lchan->abis_ip.ass_compl.rr_cause, chosen_channel, lchan->encr.alg_id, perm_spch, addr_local_p, sc_ptr, NULL, lcls_get_status(conn)); if (!resp) { assignment_fail(GSM0808_CAUSE_EQUIPMENT_FAILURE, "Unable to compose Assignment Complete message"); return; } if (gscon_is_aoip(conn) && conn->assignment.requires_voice_stream && conn->assignment.req.use_osmux) _gsm0808_ass_compl_extend_osmux(resp, osmux_cid); rc = gscon_sigtran_send(conn, resp); if (rc) { assignment_fail(GSM0808_CAUSE_EQUIPMENT_FAILURE, "Unable send Assignment Complete message: rc=%d %s", rc, strerror(-rc)); return; } } static void assignment_success(struct gsm_subscriber_connection *conn) { /* Take on the new lchan */ gscon_change_primary_lchan(conn, conn->assignment.new_lchan); conn->assignment.new_lchan = NULL; /* apply LCLS configuration (if any) */ lcls_apply_config(conn); send_assignment_complete(conn); /* If something went wrong during send_assignment_complete(), the fi will be gone from * error handling in there. Almost a success, but then again the whole thing failed. */ if (!conn->assignment.fi) { /* The lchan was ready, and we failed to tell the MSC about it. By releasing this lchan, * the conn will notice that its primary lchan is gone and should clean itself up. */ lchan_release(conn->lchan, true, true, RSL_ERR_EQUIPMENT_FAIL); return; } /* Rembered this only for error handling: should assignment fail, assignment_reset() will release * the MGW endpoint right away. If successful, the conn continues to use the endpoint. */ conn->assignment.created_ci_for_msc = NULL; /* New RTP information is now accepted */ conn->user_plane.msc_assigned_cic = conn->assignment.req.msc_assigned_cic; osmo_strlcpy(conn->user_plane.msc_assigned_rtp_addr, conn->assignment.req.msc_rtp_addr, sizeof(conn->user_plane.msc_assigned_rtp_addr)); conn->user_plane.msc_assigned_rtp_port = conn->assignment.req.msc_rtp_port; LOG_ASSIGNMENT(conn, LOGL_DEBUG, "Assignment successful\n"); osmo_fsm_inst_term(conn->assignment.fi, OSMO_FSM_TERM_REGULAR, 0); assignment_count_result(BSC_CTR_ASSIGNMENT_COMPLETED); } static void assignment_fsm_update_id(struct gsm_subscriber_connection *conn) { struct gsm_lchan *new_lchan = conn->assignment.new_lchan; if (!new_lchan) { osmo_fsm_inst_update_id(conn->assignment.fi, conn->fi->id); return; } osmo_fsm_inst_update_id_f(conn->assignment.fi, "%s_%u-%u-%u-%s%s%s-%u", conn->fi->id, new_lchan->ts->trx->bts->nr, new_lchan->ts->trx->nr, new_lchan->ts->nr, gsm_pchan_id(new_lchan->ts->pchan_on_init), (new_lchan->ts->pchan_on_init == new_lchan->ts->pchan_is)? "" : "as", (new_lchan->ts->pchan_on_init == new_lchan->ts->pchan_is)? "" : gsm_pchan_id(new_lchan->ts->pchan_is), new_lchan->nr); } static bool lchan_type_compat_with_mode(enum gsm_chan_t type, const struct channel_mode_and_rate *ch_mode_rate) { enum gsm48_chan_mode chan_mode = ch_mode_rate->chan_mode; enum channel_rate chan_rate = ch_mode_rate->chan_rate; switch (chan_mode) { case GSM48_CMODE_SIGN: switch (type) { case GSM_LCHAN_TCH_F: return chan_rate == CH_RATE_FULL; case GSM_LCHAN_TCH_H: return chan_rate == CH_RATE_HALF; case GSM_LCHAN_SDCCH: return chan_rate == CH_RATE_SDCCH; default: return false; } case GSM48_CMODE_SPEECH_V1: case GSM48_CMODE_SPEECH_AMR: case GSM48_CMODE_DATA_3k6: case GSM48_CMODE_DATA_6k0: /* these services can all run on TCH/H, but we may have * an explicit override by the 'chan_rate' argument */ switch (type) { case GSM_LCHAN_TCH_F: return chan_rate == CH_RATE_FULL; case GSM_LCHAN_TCH_H: return chan_rate == CH_RATE_HALF; default: return false; } case GSM48_CMODE_DATA_12k0: case GSM48_CMODE_DATA_14k5: case GSM48_CMODE_SPEECH_EFR: /* these services all explicitly require a TCH/F */ return type == GSM_LCHAN_TCH_F; default: return false; } } void assignment_fsm_init() { OSMO_ASSERT(osmo_fsm_register(&assignment_fsm) == 0); } static int check_requires_voice(bool *requires_voice, enum gsm48_chan_mode chan_mode) { *requires_voice = false; switch (chan_mode) { case GSM48_CMODE_SPEECH_V1: case GSM48_CMODE_SPEECH_EFR: case GSM48_CMODE_SPEECH_AMR: *requires_voice = true; break; case GSM48_CMODE_SIGN: *requires_voice = false; break; default: return -EINVAL; } return 0; } /* Check if the incoming assignment requests requires a voice stream or not, * we will look at the preferred and the alternate channel mode and also make * sure that both are consistent. */ static int check_requires_voice_stream(struct gsm_subscriber_connection *conn) { bool requires_voice_pref = false, requires_voice_alt; struct assignment_request *req = &conn->assignment.req; struct osmo_fsm_inst *fi = conn->fi; int i, rc; /* When the assignment request indicates that there is an alternate * rate available (e.g. "Full or Half rate channel, Half rate * preferred..."), then both must be either voice or either signalling, * a mismatch is not permitted */ for (i = 0; i < req->n_ch_mode_rate; i++) { rc = check_requires_voice(&requires_voice_alt, req->ch_mode_rate[i].chan_mode); if (rc < 0) { assignment_fail(GSM0808_CAUSE_REQ_CODEC_TYPE_OR_CONFIG_NOT_SUPP, "Channel mode not supported (prev level %d): %s", i, gsm48_chan_mode_name(req->ch_mode_rate[i].chan_mode)); return -EINVAL; } if (i==0) requires_voice_pref = requires_voice_alt; else if (requires_voice_alt != requires_voice_pref) { assignment_fail(GSM0808_CAUSE_REQ_CODEC_TYPE_OR_CONFIG_NOT_SUPP, "Inconsistent channel modes: %s != %s", gsm48_chan_mode_name(req->ch_mode_rate[0].chan_mode), gsm48_chan_mode_name(req->ch_mode_rate[i].chan_mode)); return -EINVAL; } } conn->assignment.requires_voice_stream = requires_voice_pref; return 0; } /* Check if the conn is already associated with an lchan. If yes, we will check * if that lchan is compatible with the preferred rate/codec. If the lchan * turns out to be incompatible we try with the alternate rate/codec. */ static bool reuse_existing_lchan(struct gsm_subscriber_connection *conn) { struct assignment_request *req = &conn->assignment.req; int i; if (!conn->lchan) return false; /* Check if the currently existing lchan is compatible with the * preferred rate/codec. */ for (i = 0; i < req->n_ch_mode_rate; i++) if (lchan_type_compat_with_mode(conn->lchan->type, &req->ch_mode_rate[i])) { conn->lchan->ch_mode_rate = req->ch_mode_rate[i]; break; } if (i == req->n_ch_mode_rate) return false; if (conn->lchan->tch_mode != conn->lchan->ch_mode_rate.chan_mode) { /* FIXME: send Channel Mode Modify to put the current lchan in the right mode, and kick * off its RTP stream setup code path. See gsm48_lchan_modify() and * gsm48_rx_rr_modif_ack(), and see lchan_fsm.h LCHAN_EV_CHAN_MODE_MODIF_* */ LOG_ASSIGNMENT(conn, LOGL_DEBUG, "Current lchan would be compatible, but Channel Mode Modify is not implemented\n"); return false; } return true; } void assignment_fsm_start(struct gsm_subscriber_connection *conn, struct gsm_bts *bts, struct assignment_request *req) { static const char *rate_names[] = { [CH_RATE_SDCCH] = "SDCCH", [CH_RATE_HALF] = "HR", [CH_RATE_FULL] = "FR", }; struct osmo_fsm_inst *fi; struct lchan_activate_info info; int i; OSMO_ASSERT(conn); OSMO_ASSERT(conn->fi); OSMO_ASSERT(!conn->assignment.fi); OSMO_ASSERT(!conn->assignment.new_lchan); assignment_count(BSC_CTR_ASSIGNMENT_ATTEMPTED); fi = osmo_fsm_inst_alloc_child(&assignment_fsm, conn->fi, GSCON_EV_ASSIGNMENT_END); OSMO_ASSERT(fi); conn->assignment.fi = fi; fi->priv = conn; /* Create a copy of the request data and use that copy from now on. */ conn->assignment.req = *req; req = &conn->assignment.req; /* Check if we need a voice stream. If yes, set the appropriate struct * members in conn */ if (check_requires_voice_stream(conn) < 0) return; /* There may be an already existing lchan, if yes, try to work with * the existing lchan */ if (reuse_existing_lchan(conn)) { LOG_ASSIGNMENT(conn, LOGL_DEBUG, "Current lchan is compatible with requested chan_mode," " sending BSSMAP Assignment Complete directly." " requested chan_mode=%s; current lchan is %s\n", gsm48_chan_mode_name(conn->lchan->ch_mode_rate.chan_mode), gsm_lchan_name(conn->lchan)); send_assignment_complete(conn); /* If something went wrong during send_assignment_complete(), the fi will be gone from * error handling in there. */ if (conn->assignment.fi) { assignment_count_result(BSC_CTR_ASSIGNMENT_COMPLETED); osmo_fsm_inst_term(conn->assignment.fi, OSMO_FSM_TERM_REGULAR, 0); } return; } /* Try to allocate a new lchan in order of preference */ for (i = 0; i < req->n_ch_mode_rate; i++) { conn->assignment.new_lchan = lchan_select_by_chan_mode(bts, req->ch_mode_rate[i].chan_mode, req->ch_mode_rate[i].chan_rate); conn->lchan->ch_mode_rate = req->ch_mode_rate[i]; if (conn->assignment.new_lchan) break; } /* Check whether the lchan allocation was successful or not and tear * down the assignment in case of failure. */ if (!conn->assignment.new_lchan) { assignment_count_result(BSC_CTR_ASSIGNMENT_NO_CHANNEL); assignment_fail(GSM0808_CAUSE_NO_RADIO_RESOURCE_AVAILABLE, "BSSMAP Assignment Command:" " No lchan available for: pref=%s:%s / alt1=%s:%s / alt2=%s:%s\n", gsm48_chan_mode_name(req->ch_mode_rate[0].chan_mode), rate_names[req->ch_mode_rate[0].chan_rate], req->n_ch_mode_rate >= 1 ? gsm48_chan_mode_name(req->ch_mode_rate[0].chan_mode) : "", req->n_ch_mode_rate >= 1 ? rate_names[req->ch_mode_rate[0].chan_rate] : "", req->n_ch_mode_rate >= 2 ? gsm48_chan_mode_name(req->ch_mode_rate[0].chan_mode) : "", req->n_ch_mode_rate >= 2 ? rate_names[req->ch_mode_rate[0].chan_rate] : "" ); return; } assignment_fsm_update_id(conn); LOG_ASSIGNMENT(conn, LOGL_INFO, "Starting Assignment: chan_mode=%s, chan_type=%s," " aoip=%s MSC-rtp=%s:%u (osmux=%s)\n", gsm48_chan_mode_name(conn->lchan->ch_mode_rate.chan_mode), rate_names[conn->lchan->ch_mode_rate.chan_rate], req->aoip ? "yes" : "no", req->msc_rtp_addr, req->msc_rtp_port, req->use_osmux ? "yes" : "no"); assignment_fsm_state_chg(ASSIGNMENT_ST_WAIT_LCHAN_ACTIVE); info = (struct lchan_activate_info){ .activ_for = FOR_ASSIGNMENT, .for_conn = conn, .chan_mode = conn->lchan->ch_mode_rate.chan_mode, .encr = conn->lchan->encr, .s15_s0 = conn->lchan->ch_mode_rate.s15_s0, .requires_voice_stream = conn->assignment.requires_voice_stream, .msc_assigned_cic = req->msc_assigned_cic, .re_use_mgw_endpoint_from_lchan = conn->lchan, }; lchan_activate(conn->assignment.new_lchan, &info); } static void assignment_fsm_wait_lchan(struct osmo_fsm_inst *fi, uint32_t event, void *data) { struct gsm_subscriber_connection *conn = assignment_fi_conn(fi); switch (event) { case ASSIGNMENT_EV_LCHAN_ACTIVE: if (data != conn->assignment.new_lchan) return; /* The TS may have changed its pchan_is */ assignment_fsm_update_id(conn); assignment_fsm_state_chg(ASSIGNMENT_ST_WAIT_RR_ASS_COMPLETE); return; default: OSMO_ASSERT(false); } } static void assignment_fsm_wait_rr_ass_complete_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state) { int rc; struct gsm_subscriber_connection *conn = assignment_fi_conn(fi); rc = gsm48_send_rr_ass_cmd(conn->lchan, conn->assignment.new_lchan, conn->lchan->ms_power); if (rc) assignment_fail(GSM0808_CAUSE_EQUIPMENT_FAILURE, "Unable to send RR Assignment Command"); } static uint8_t get_cause(void *data) { if (data) return *(uint8_t*)data; return GSM0808_CAUSE_EQUIPMENT_FAILURE; } static void assignment_fsm_wait_rr_ass_complete(struct osmo_fsm_inst *fi, uint32_t event, void *data) { struct gsm_subscriber_connection *conn = assignment_fi_conn(fi); switch (event) { case ASSIGNMENT_EV_RR_ASSIGNMENT_COMPLETE: assignment_fsm_state_chg(ASSIGNMENT_ST_WAIT_LCHAN_ESTABLISHED); return; case ASSIGNMENT_EV_LCHAN_ESTABLISHED: LOG_ASSIGNMENT(conn, LOGL_DEBUG, "lchan established, still waiting for RR Assignment Complete\n"); /* The lchan is already done with all of its RTP setup. We will notice the lchan state * being LCHAN_ST_ESTABLISHED in assignment_fsm_wait_lchan_established_onenter(). */ return; case ASSIGNMENT_EV_RR_ASSIGNMENT_FAIL: assignment_count_result(BSC_CTR_ASSIGNMENT_FAILED); assignment_fail(get_cause(data), "Rx RR Assignment Failure"); return; default: OSMO_ASSERT(false); } } static void assignment_fsm_post_lchan_established(struct osmo_fsm_inst *fi); static void assignment_fsm_wait_lchan_established_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state) { struct gsm_subscriber_connection *conn = assignment_fi_conn(fi); /* Do we still need to wait for the RTP stream at all? */ if (lchan_state_is(conn->assignment.new_lchan, LCHAN_ST_ESTABLISHED)) { LOG_ASSIGNMENT(conn, LOGL_DEBUG, "lchan fully established, no need to wait\n"); assignment_fsm_post_lchan_established(fi); } } static void assignment_fsm_wait_lchan_established(struct osmo_fsm_inst *fi, uint32_t event, void *data) { switch (event) { case ASSIGNMENT_EV_LCHAN_ESTABLISHED: assignment_fsm_post_lchan_established(fi); return; default: OSMO_ASSERT(false); } } static void assignment_fsm_post_lchan_established(struct osmo_fsm_inst *fi) { struct gsm_subscriber_connection *conn = assignment_fi_conn(fi); if (conn->assignment.requires_voice_stream) assignment_fsm_state_chg(ASSIGNMENT_ST_WAIT_MGW_ENDPOINT_TO_MSC); else assignment_success(conn); } static void assignment_fsm_wait_mgw_endpoint_to_msc_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state) { struct gsm_subscriber_connection *conn = assignment_fi_conn(fi); OSMO_ASSERT(conn->assignment.requires_voice_stream); LOG_ASSIGNMENT(conn, LOGL_DEBUG, "Connecting MGW endpoint to the MSC's RTP port: %s:%u\n", conn->assignment.req.msc_rtp_addr, conn->assignment.req.msc_rtp_port); if (!gscon_connect_mgw_to_msc(conn, conn->assignment.new_lchan, conn->assignment.req.msc_rtp_addr, conn->assignment.req.msc_rtp_port, fi, ASSIGNMENT_EV_MSC_MGW_OK, ASSIGNMENT_EV_MSC_MGW_FAIL, NULL, &conn->assignment.created_ci_for_msc)) { assignment_fail(GSM0808_CAUSE_EQUIPMENT_FAILURE, "Unable to connect MGW endpoint to the MSC side"); return; } } static void assignment_fsm_wait_mgw_endpoint_to_msc(struct osmo_fsm_inst *fi, uint32_t event, void *data) { struct gsm_subscriber_connection *conn = assignment_fi_conn(fi); switch (event) { case ASSIGNMENT_EV_MSC_MGW_OK: /* For AoIP, we created the MGW endpoint. Ensure it is really there, and log it. */ if (gscon_is_aoip(conn)) { const struct mgcp_conn_peer *mgw_info; mgw_info = osmo_mgcpc_ep_ci_get_rtp_info(conn->user_plane.mgw_endpoint_ci_msc); if (!mgw_info) { assignment_fail(GSM0808_CAUSE_EQUIPMENT_FAILURE, "Unable to retrieve RTP port info allocated by MGW for" " the MSC side."); return; } LOG_ASSIGNMENT(conn, LOGL_DEBUG, "MGW's MSC side CI: %s:%u\n", mgw_info->addr, mgw_info->port); } assignment_success(conn); return; case ASSIGNMENT_EV_MSC_MGW_FAIL: assignment_fail(GSM0808_CAUSE_EQUIPMENT_FAILURE, "Unable to connect MGW endpoint to the MSC side"); return; default: OSMO_ASSERT(false); } } #define S(x) (1 << (x)) static const struct osmo_fsm_state assignment_fsm_states[] = { [ASSIGNMENT_ST_WAIT_LCHAN_ACTIVE] = { .name = "WAIT_LCHAN_ACTIVE", .action = assignment_fsm_wait_lchan, .in_event_mask = 0 | S(ASSIGNMENT_EV_LCHAN_ACTIVE) , .out_state_mask = 0 | S(ASSIGNMENT_ST_WAIT_LCHAN_ACTIVE) | S(ASSIGNMENT_ST_WAIT_RR_ASS_COMPLETE) , }, [ASSIGNMENT_ST_WAIT_RR_ASS_COMPLETE] = { .name = "WAIT_RR_ASS_COMPLETE", .onenter = assignment_fsm_wait_rr_ass_complete_onenter, .action = assignment_fsm_wait_rr_ass_complete, .in_event_mask = 0 | S(ASSIGNMENT_EV_RR_ASSIGNMENT_COMPLETE) | S(ASSIGNMENT_EV_RR_ASSIGNMENT_FAIL) | S(ASSIGNMENT_EV_LCHAN_ESTABLISHED) , .out_state_mask = 0 | S(ASSIGNMENT_ST_WAIT_LCHAN_ESTABLISHED) , }, [ASSIGNMENT_ST_WAIT_LCHAN_ESTABLISHED] = { .name = "WAIT_LCHAN_ESTABLISHED", .onenter = assignment_fsm_wait_lchan_established_onenter, .action = assignment_fsm_wait_lchan_established, .in_event_mask = 0 | S(ASSIGNMENT_EV_LCHAN_ESTABLISHED) , .out_state_mask = 0 | S(ASSIGNMENT_ST_WAIT_MGW_ENDPOINT_TO_MSC) , }, [ASSIGNMENT_ST_WAIT_MGW_ENDPOINT_TO_MSC] = { .name = "WAIT_MGW_ENDPOINT_TO_MSC", .onenter = assignment_fsm_wait_mgw_endpoint_to_msc_onenter, .action = assignment_fsm_wait_mgw_endpoint_to_msc, .in_event_mask = 0 | S(ASSIGNMENT_EV_MSC_MGW_OK) | S(ASSIGNMENT_EV_MSC_MGW_FAIL) , }, }; static const struct value_string assignment_fsm_event_names[] = { OSMO_VALUE_STRING(ASSIGNMENT_EV_LCHAN_ACTIVE), OSMO_VALUE_STRING(ASSIGNMENT_EV_LCHAN_ESTABLISHED), OSMO_VALUE_STRING(ASSIGNMENT_EV_LCHAN_ERROR), OSMO_VALUE_STRING(ASSIGNMENT_EV_MSC_MGW_OK), OSMO_VALUE_STRING(ASSIGNMENT_EV_MSC_MGW_FAIL), OSMO_VALUE_STRING(ASSIGNMENT_EV_RR_ASSIGNMENT_COMPLETE), OSMO_VALUE_STRING(ASSIGNMENT_EV_RR_ASSIGNMENT_FAIL), OSMO_VALUE_STRING(ASSIGNMENT_EV_CONN_RELEASING), {} }; void assignment_fsm_allstate_action(struct osmo_fsm_inst *fi, uint32_t event, void *data) { struct gsm_subscriber_connection *conn = assignment_fi_conn(fi); switch (event) { case ASSIGNMENT_EV_CONN_RELEASING: assignment_count_result(BSC_CTR_ASSIGNMENT_STOPPED); osmo_fsm_inst_term(fi, OSMO_FSM_TERM_REQUEST, 0); return; case ASSIGNMENT_EV_LCHAN_ERROR: if (data != conn->assignment.new_lchan) return; assignment_fail(conn->assignment.new_lchan->activate.gsm0808_error_cause, "Failed to activate lchan %s", gsm_lchan_name(conn->assignment.new_lchan)); return; default: return; } } int assignment_fsm_timer_cb(struct osmo_fsm_inst *fi) { struct gsm_subscriber_connection *conn = assignment_fi_conn(fi); assignment_count_result(BSC_CTR_ASSIGNMENT_TIMEOUT); assignment_fail(GSM0808_CAUSE_EQUIPMENT_FAILURE, "Timeout"); return 0; } void assignment_fsm_cleanup(struct osmo_fsm_inst *fi, enum osmo_fsm_term_cause cause) { struct gsm_subscriber_connection *conn = assignment_fi_conn(fi); assignment_reset(conn); conn->assignment.fi = NULL; } static struct osmo_fsm assignment_fsm = { .name = "assignment", .states = assignment_fsm_states, .num_states = ARRAY_SIZE(assignment_fsm_states), .log_subsys = DAS, .event_names = assignment_fsm_event_names, .allstate_action = assignment_fsm_allstate_action, .allstate_event_mask = 0 | S(ASSIGNMENT_EV_CONN_RELEASING) | S(ASSIGNMENT_EV_LCHAN_ERROR) , .timer_cb = assignment_fsm_timer_cb, .cleanup = assignment_fsm_cleanup, };