diff options
Diffstat (limited to 'src/osmo-bsc/mgw_endpoint_fsm.c')
| -rw-r--r-- | src/osmo-bsc/mgw_endpoint_fsm.c | 746 |
1 files changed, 746 insertions, 0 deletions
diff --git a/src/osmo-bsc/mgw_endpoint_fsm.c b/src/osmo-bsc/mgw_endpoint_fsm.c new file mode 100644 index 000000000..ba10f5c90 --- /dev/null +++ b/src/osmo-bsc/mgw_endpoint_fsm.c @@ -0,0 +1,746 @@ +/* osmo-bsc API to manage all sides of an MGW endpoint + * + * (C) 2018 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de> + * All Rights Reserved + * + * Author: Neels Hofmeyr <neels@hofmeyr.de> + * + * 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 <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> + +#include <osmocom/core/fsm.h> +#include <osmocom/core/byteswap.h> + +#include <osmocom/bsc/debug.h> +#include <osmocom/bsc/gsm_timers.h> + +#include <osmocom/bsc/mgw_endpoint_fsm.h> +#include <osmocom/bsc/lchan_fsm.h> +#include <osmocom/bsc/gsm_data.h> + +#define LOG_CI(ci, level, fmt, args...) do { \ + if (!ci || !ci->mgwep) \ + LOGP(DLGLOBAL, level, "(unknown MGW endpoint) " fmt, ## args); \ + else \ + LOG_MGWEP(ci->mgwep, level, "CI[%d] %s%s%s: " fmt, \ + (int)(ci - ci->mgwep->ci), \ + ci->label ? : "-", \ + ci->mgcp_ci_str[0] ? " CI=" : "", \ + ci->mgcp_ci_str[0] ? ci->mgcp_ci_str : "", \ + ## args); \ + } while(0) + +#define LOG_CI_VERB(ci, level, fmt, args...) do { \ + if (ci->verb_info.addr) \ + LOG_CI(ci, level, "%s %s:%u: " fmt, \ + mgcp_verb_name(ci->verb), ci->verb_info.addr, ci->verb_info.port, \ + ## args); \ + else \ + LOG_CI(ci, level, "%s: " fmt, \ + mgcp_verb_name(ci->verb), \ + ## args); \ + } while(0) + +#define FIRST_CI_EVENT (_MGWEP_EV_LAST + (_MGWEP_EV_LAST & 1)) /* rounded up to even nr */ +#define USABLE_CI ((32 - FIRST_CI_EVENT)/2) +#define EV_TO_CI_IDX(event) ((event - FIRST_CI_EVENT) / 2) + +#define CI_EV_SUCCESS(ci) (FIRST_CI_EVENT + (((ci) - ci->mgwep->ci) * 2)) +#define CI_EV_FAILURE(ci) (CI_EV_SUCCESS(ci) + 1) + +static struct osmo_fsm mgwep_fsm; + +struct mgwep_ci { + struct mgw_endpoint *mgwep; + + bool occupied; + char label[64]; + struct osmo_fsm_inst *mgcp_client_fi; + + bool pending; + bool sent; + enum mgcp_verb verb; + struct mgcp_conn_peer verb_info; + struct osmo_fsm_inst *notify; + uint32_t notify_success; + uint32_t notify_failure; + void *notify_data; + + bool got_port_info; + struct mgcp_conn_peer rtp_info; + char mgcp_ci_str[MGCP_CONN_ID_LENGTH]; +}; + +struct mgw_endpoint { + struct mgcp_client *mgcp_client; + struct osmo_fsm_inst *fi; + char endpoint[MGCP_ENDPOINT_MAXLEN]; + + struct mgwep_ci ci[USABLE_CI]; +}; + +static const struct value_string mgcp_verb_names[] = { + { MGCP_VERB_CRCX, "CRCX" }, + { MGCP_VERB_MDCX, "MDCX" }, + { MGCP_VERB_DLCX, "DLCX" }, + { MGCP_VERB_AUEP, "AUEP" }, + { MGCP_VERB_RSIP, "RSIP" }, + {} +}; + +static inline const char *mgcp_verb_name(enum mgcp_verb val) +{ return get_value_string(mgcp_verb_names, val); } + +static struct mgwep_ci *mgwep_check_ci(struct mgwep_ci *ci) +{ + if (!ci) + return NULL; + if (!ci->mgwep) + return NULL; + if (ci < ci->mgwep->ci || ci >= &ci->mgwep->ci[USABLE_CI]) + return NULL; + return ci; +} + +static struct mgwep_ci *mgwep_ci_for_event(struct mgw_endpoint *mgwep, uint32_t event) +{ + int idx; + if (event < FIRST_CI_EVENT) + return NULL; + idx = EV_TO_CI_IDX(event); + if (idx >= sizeof(mgwep->ci)) + return NULL; + return mgwep_check_ci(&mgwep->ci[idx]); +} + +const char *mgw_endpoint_name(const struct mgw_endpoint *mgwep) +{ + if (!mgwep) + return "NULL"; + if (mgwep->endpoint[0]) + return mgwep->endpoint; + return osmo_fsm_inst_name(mgwep->fi); +} + +const char *mgcp_conn_peer_name(const struct mgcp_conn_peer *info) +{ + /* I'd be fine with a smaller buffer and accept truncation, but gcc possibly refuses to build if + * this buffer is too small. */ + static char buf[1024]; + + if (!info) + return "NULL"; + + if (info->endpoint[0] + && info->addr[0]) + snprintf(buf, sizeof(buf), "%s:%s:%u", + info->endpoint, info->addr, info->port); + else if (info->endpoint[0]) + snprintf(buf, sizeof(buf), "%s", info->endpoint); + else if (info->addr[0]) + snprintf(buf, sizeof(buf), "%s:%u", info->addr, info->port); + else + return "empty"; + return buf; +} + +const char *mgwep_ci_name(const struct mgwep_ci *ci) +{ + const struct mgcp_conn_peer *rtp_info; + + if (!ci) + return "NULL"; + + rtp_info = mgwep_ci_get_rtp_info(ci); + + if (rtp_info) + return mgcp_conn_peer_name(rtp_info); + return mgw_endpoint_name(ci->mgwep); +} + +static struct value_string mgwep_fsm_event_names[33] = {}; + +static char mgwep_fsm_event_name_bufs[32][32] = {}; + +static void fill_event_names() +{ + int i; + for (i = 0; i < (ARRAY_SIZE(mgwep_fsm_event_names) - 1); i++) { + if (i < _MGWEP_EV_LAST) + continue; + if (i < FIRST_CI_EVENT || EV_TO_CI_IDX(i) > USABLE_CI) { + mgwep_fsm_event_names[i] = (struct value_string){i, "Unused"}; + continue; + } + snprintf(mgwep_fsm_event_name_bufs[i], sizeof(mgwep_fsm_event_name_bufs[i]), + "MGW Response for CI #%d", EV_TO_CI_IDX(i)); + mgwep_fsm_event_names[i] = (struct value_string){i, mgwep_fsm_event_name_bufs[i]}; + } +} + +static struct T_def *g_T_defs = NULL; + +void mgw_endpoint_fsm_init(struct T_def *T_defs) +{ + g_T_defs = T_defs; + OSMO_ASSERT(osmo_fsm_register(&mgwep_fsm) == 0); + fill_event_names(); +} + +struct mgw_endpoint *mgwep_fi_mgwep(struct osmo_fsm_inst *fi) +{ + OSMO_ASSERT(fi); + OSMO_ASSERT(fi->fsm == &mgwep_fsm); + OSMO_ASSERT(fi->priv); + return fi->priv; +} + +struct mgw_endpoint *mgw_endpoint_alloc(struct osmo_fsm_inst *parent, uint32_t parent_term_event, + struct mgcp_client *mgcp_client, + const char *fsm_id, + const char *endpoint_str_fmt, ...) +{ + va_list ap; + struct osmo_fsm_inst *fi; + struct mgw_endpoint *mgwep; + int rc; + + if (!mgcp_client) + return NULL; + + /* use mgcp_client as talloc ctx, so that the conn, lchan, ts can deallocate while MGCP DLCX are + * still going on. */ + fi = osmo_fsm_inst_alloc_child(&mgwep_fsm, parent, parent_term_event); + OSMO_ASSERT(fi); + + osmo_fsm_inst_update_id(fi, fsm_id); + + mgwep = talloc_zero(fi, struct mgw_endpoint); + OSMO_ASSERT(mgwep); + + mgwep->mgcp_client = mgcp_client; + mgwep->fi = fi; + mgwep->fi->priv = mgwep; + + va_start(ap, endpoint_str_fmt); + rc = vsnprintf(mgwep->endpoint, sizeof(mgwep->endpoint), endpoint_str_fmt, ap); + va_end(ap); + + if (rc <= 0 || rc >= sizeof(mgwep->endpoint)) { + LOG_MGWEP(mgwep, LOGL_ERROR, "Endpoint name too long or too short: %s\n", + mgwep->endpoint); + osmo_fsm_inst_term(mgwep->fi, OSMO_FSM_TERM_ERROR, 0); + return NULL; + } + + return mgwep; +} + +struct mgwep_ci *mgw_endpoint_ci_add(struct mgw_endpoint *mgwep, + const char *label_fmt, ...) +{ + va_list ap; + int i; + struct mgwep_ci *ci; + + for (i = 0; i < USABLE_CI; i++) { + ci = &mgwep->ci[i]; + + if (ci->occupied || ci->mgcp_client_fi) + continue; + + *ci = (struct mgwep_ci){ + .mgwep = mgwep, + .occupied = true, + }; + if (label_fmt) { + va_start(ap, label_fmt); + vsnprintf(ci->label, sizeof(ci->label), label_fmt, ap); + va_end(ap); + } + return ci; + } + + LOG_MGWEP(mgwep, LOGL_ERROR, + "Cannot allocate another endpoint, all " + OSMO_STRINGIFY_VAL(USABLE_CI) " are in use\n"); + + return NULL; +} + +static void mgwep_fsm_check_state_chg_after_response(struct osmo_fsm_inst *fi); + +static void on_failure(struct mgwep_ci *ci) +{ + if (!ci->occupied) + return; + + if (ci->notify) + osmo_fsm_inst_dispatch(ci->notify, ci->notify_failure, ci->notify_data); + + *ci = (struct mgwep_ci){ + .mgwep = ci->mgwep, + }; + + + mgwep_fsm_check_state_chg_after_response(ci->mgwep->fi); +} + +static void on_success(struct mgwep_ci *ci, void *data) +{ + struct mgcp_conn_peer *rtp_info; + + if (!ci->occupied) + return; + + ci->pending = false; + + switch (ci->verb) { + case MGCP_VERB_CRCX: + /* If we sent a wildcarded endpoint name on CRCX, we need to store the resulting endpoint + * name here. Also, we receive the MGW's RTP port information. */ + rtp_info = data; + OSMO_ASSERT(rtp_info); + ci->got_port_info = true; + ci->rtp_info = *rtp_info; + osmo_strlcpy(ci->mgcp_ci_str, mgcp_conn_get_ci(ci->mgcp_client_fi), + sizeof(ci->mgcp_ci_str)); + if (rtp_info->endpoint[0]) { + int rc; + rc = osmo_strlcpy(ci->mgwep->endpoint, rtp_info->endpoint, + sizeof(ci->mgwep->endpoint)); + if (rc <= 0 || rc >= sizeof(ci->mgwep->endpoint)) { + LOG_CI(ci, LOGL_ERROR, "Unable to copy endpoint name '%s'\n", + rtp_info->endpoint); + mgw_endpoint_ci_dlcx(ci); + on_failure(ci); + return; + } + } + break; + + default: + break; + } + + LOG_CI(ci, LOGL_DEBUG, "received successful response to %s RTP=%s%s\n", + mgcp_verb_name(ci->verb), + mgcp_conn_peer_name(ci->got_port_info? &ci->rtp_info : NULL), + ci->notify ? "" : " (not sending a notification)"); + + if (ci->notify) + osmo_fsm_inst_dispatch(ci->notify, ci->notify_success, ci->notify_data); + + mgwep_fsm_check_state_chg_after_response(ci->mgwep->fi); +} + +const struct mgcp_conn_peer *mgwep_ci_get_rtp_info(const struct mgwep_ci *ci) +{ + ci = mgwep_check_ci((struct mgwep_ci*)ci); + if (!ci) + return NULL; + if (!ci->got_port_info) + return NULL; + return &ci->rtp_info; +} + +bool mgwep_ci_get_crcx_info_to_sockaddr(const struct mgwep_ci *ci, struct sockaddr_storage *dest) +{ + const struct mgcp_conn_peer *rtp_info; + struct sockaddr_in *sin; + + rtp_info = mgwep_ci_get_rtp_info(ci); + if (!rtp_info) + return false; + + sin = (struct sockaddr_in *)dest; + + sin->sin_family = AF_INET; + sin->sin_addr.s_addr = inet_addr(rtp_info->addr); + sin->sin_port = osmo_ntohs(rtp_info->port); + return true; +} + + +static const struct state_timeout mgwep_fsm_timeouts[32] = { + [MGWEP_ST_WAIT_MGW_RESPONSE] = { .T=23042 }, +}; + +/* Transition to a state, using the T timer defined in assignment_fsm_timeouts. + * The actual timeout value is in turn obtained from g_T_defs. + * Assumes local variable fi exists. */ +#define mgwep_fsm_state_chg(state) \ + fsm_inst_state_chg_T(fi, state, mgwep_fsm_timeouts, g_T_defs, 5) + +void mgw_endpoint_ci_request(struct mgwep_ci *ci, + enum mgcp_verb verb, const struct mgcp_conn_peer *verb_info, + struct osmo_fsm_inst *notify, + uint32_t event_success, uint32_t event_failure, + void *notify_data) +{ + struct mgw_endpoint *mgwep; + struct osmo_fsm_inst *fi; + struct mgwep_ci cleared_ci; + ci = mgwep_check_ci(ci); + + if (!ci) { + LOGP(DLGLOBAL, LOGL_ERROR, "Invalid MGW endpoint request: no ci\n"); + goto dispatch_error; + } + if (!verb_info && verb != MGCP_VERB_DLCX) { + LOG_CI(ci, LOGL_ERROR, "Invalid MGW endpoint request: missing verb details for %s\n", + mgcp_verb_name(verb)); + goto dispatch_error; + } + if ((verb < 0) || (verb > MGCP_VERB_RSIP)) { + LOG_CI(ci, LOGL_ERROR, "Invalid MGW endpoint request: unknown verb: %s\n", + mgcp_verb_name(verb)); + goto dispatch_error; + } + + mgwep = ci->mgwep; + fi = mgwep->fi; + + /* Clear volatile state by explicitly keeping those that should remain. Because we can't assign + * the char[] directly, dance through cleared_ci and copy back. */ + cleared_ci = (struct mgwep_ci){ + .mgwep = mgwep, + .mgcp_client_fi = ci->mgcp_client_fi, + .got_port_info = ci->got_port_info, + .rtp_info = ci->rtp_info, + + .occupied = true, + /* .pending = true follows below */ + .verb = verb, + .notify = notify, + .notify_success = event_success, + .notify_failure = event_failure, + .notify_data = notify_data, + }; + osmo_strlcpy(cleared_ci.label, ci->label, sizeof(cleared_ci.label)); + osmo_strlcpy(cleared_ci.mgcp_ci_str, ci->mgcp_ci_str, sizeof(cleared_ci.mgcp_ci_str)); + *ci = cleared_ci; + + LOG_CI_VERB(ci, LOGL_DEBUG, "notify=%s\n", osmo_fsm_inst_name(ci->notify)); + + if (verb_info) + ci->verb_info = *verb_info; + + if (mgwep->endpoint[0]) { + if (ci->verb_info.endpoint[0] && strcmp(ci->verb_info.endpoint, mgwep->endpoint)) + LOG_CI(ci, LOGL_ERROR, + "Warning: Requested %s on endpoint %s, but this CI is on endpoint %s." + " Using the proper endpoint instead.\n", + mgcp_verb_name(verb), ci->verb_info.endpoint, mgwep->endpoint); + osmo_strlcpy(ci->verb_info.endpoint, mgwep->endpoint, sizeof(ci->verb_info.endpoint)); + } + + switch (ci->verb) { + case MGCP_VERB_CRCX: + if (ci->mgcp_client_fi) { + LOG_CI(ci, LOGL_ERROR, "CRCX can be called only once per MGW endpoint CI\n"); + on_failure(ci); + return; + } + break; + + case MGCP_VERB_MDCX: + case MGCP_VERB_DLCX: + if (!ci->mgcp_client_fi) { + LOG_CI_VERB(ci, LOGL_ERROR, "The first verb on an unused MGW endpoint CI must be CRCX, not %s\n", + mgcp_verb_name(ci->verb)); + on_failure(ci); + return; + } + break; + + default: + LOG_CI(ci, LOGL_ERROR, "This verb is not supported: %s\n", mgcp_verb_name(ci->verb)); + on_failure(ci); + return; + } + + ci->pending = true; + + LOG_CI_VERB(ci, LOGL_DEBUG, "Scheduling\n"); + + if (mgwep->fi->state != MGWEP_ST_WAIT_MGW_RESPONSE) + mgwep_fsm_state_chg(MGWEP_ST_WAIT_MGW_RESPONSE); + + return; +dispatch_error: + if (notify) + osmo_fsm_inst_dispatch(notify, event_failure, notify_data); +} + +static int send_verb(struct mgwep_ci *ci) +{ + int rc; + struct mgw_endpoint *mgwep = ci->mgwep; + + if (!ci->occupied || !ci->pending || ci->sent) + return 0; + + switch (ci->verb) { + + case MGCP_VERB_CRCX: + OSMO_ASSERT(!ci->mgcp_client_fi); + LOG_CI_VERB(ci, LOGL_DEBUG, "Sending\n"); + ci->mgcp_client_fi = mgcp_conn_create(mgwep->mgcp_client, mgwep->fi, + CI_EV_FAILURE(ci), CI_EV_SUCCESS(ci), + &ci->verb_info); + ci->sent = true; + if (!ci->mgcp_client_fi){ + LOG_CI_VERB(ci, LOGL_ERROR, "Cannot send\n"); + on_failure(ci); + } + osmo_fsm_inst_update_id(ci->mgcp_client_fi, ci->label); + break; + + case MGCP_VERB_MDCX: + OSMO_ASSERT(ci->mgcp_client_fi); + LOG_CI_VERB(ci, LOGL_DEBUG, "Sending\n"); + rc = mgcp_conn_modify(ci->mgcp_client_fi, CI_EV_SUCCESS(ci), &ci->verb_info); + ci->sent = true; + if (rc) { + LOG_CI_VERB(ci, LOGL_ERROR, "Cannot send (rc=%d %s)\n", rc, strerror(-rc)); + on_failure(ci); + } + break; + + case MGCP_VERB_DLCX: + LOG_CI(ci, LOGL_DEBUG, "Sending MGCP: %s %s\n", + mgcp_verb_name(ci->verb), ci->mgcp_ci_str); + /* The way this is designed, we actually need to forget all about the ci right away. */ + mgcp_conn_delete(ci->mgcp_client_fi); + if (ci->notify) + osmo_fsm_inst_dispatch(ci->notify, ci->notify_success, ci->notify_data); + *ci = (struct mgwep_ci){ + .mgwep = mgwep, + }; + break; + + default: + OSMO_ASSERT(false); + } + + return 1; +} + +void mgw_endpoint_clear(struct mgw_endpoint *mgwep) +{ + if (!mgwep) + return; + osmo_fsm_inst_term(mgwep->fi, OSMO_FSM_TERM_REGULAR, 0); +} + +static void mgwep_count(struct mgw_endpoint *mgwep, int *occupied, int *pending_not_sent, + int *waiting_for_response) +{ + int i; + + if (occupied) + *occupied = 0; + + if (pending_not_sent) + *pending_not_sent = 0; + + if (waiting_for_response) + *waiting_for_response = 0; + + for (i = 0; i < ARRAY_SIZE(mgwep->ci); i++) { + struct mgwep_ci *ci = &mgwep->ci[i]; + if (ci->occupied) { + if (occupied) + (*occupied)++; + } else + continue; + + if (ci->pending) + LOG_CI_VERB(ci, LOGL_DEBUG, "%s\n", + ci->sent ? "waiting for response" : "waiting to be sent"); + else + LOG_CI_VERB(ci, LOGL_DEBUG, "%s\n", mgcp_conn_peer_name(mgwep_ci_get_rtp_info(ci))); + + if (ci->pending && ci->sent) + if (waiting_for_response) + (*waiting_for_response)++; + if (ci->pending && !ci->sent) + if (pending_not_sent) + (*pending_not_sent)++; + } +} + +static void mgwep_fsm_check_state_chg_after_response(struct osmo_fsm_inst *fi) +{ + int waiting_for_response; + int occupied; + struct mgw_endpoint *mgwep = mgwep_fi_mgwep(fi); + + mgwep_count(mgwep, &occupied, NULL, &waiting_for_response); + LOG_MGWEP(mgwep, LOGL_DEBUG, "CI in use: %d, waiting for response: %d\n", occupied, waiting_for_response); + + if (!occupied) { + /* All CI have been released. The endpoint no longer exists. Notify the parent FSM, by + * terminating. */ + osmo_fsm_inst_term(fi, OSMO_FSM_TERM_REGULAR, 0); + return; + } + + if (!waiting_for_response) { + if (fi->state != MGWEP_ST_IN_USE) + mgwep_fsm_state_chg(MGWEP_ST_IN_USE); + return; + } + +} + +static void mgwep_fsm_wait_mgw_response_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state) +{ + int count = 0; + int i; + struct mgw_endpoint *mgwep = mgwep_fi_mgwep(fi); + + for (i = 0; i < ARRAY_SIZE(mgwep->ci); i++) { + count += send_verb(&mgwep->ci[i]); + } + + LOG_MGWEP(mgwep, LOGL_DEBUG, "Sent messages: %d\n", count); + mgwep_fsm_check_state_chg_after_response(fi); + +} + +static void mgwep_fsm_handle_ci_events(struct osmo_fsm_inst *fi, uint32_t event, void *data) +{ + struct mgwep_ci *ci; + struct mgw_endpoint *mgwep = mgwep_fi_mgwep(fi); + ci = mgwep_ci_for_event(mgwep, event); + if (ci) { + if (event == CI_EV_SUCCESS(ci)) + on_success(ci, data); + else + on_failure(ci); + } +} + +static void mgwep_fsm_in_use_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state) +{ + int pending_not_sent; + struct mgw_endpoint *mgwep = mgwep_fi_mgwep(fi); + + mgwep_count(mgwep, NULL, &pending_not_sent, NULL); + if (pending_not_sent) + mgwep_fsm_state_chg(MGWEP_ST_WAIT_MGW_RESPONSE); +} + +#define S(x) (1 << (x)) + +static const struct osmo_fsm_state mgwep_fsm_states[] = { + [MGWEP_ST_UNUSED] = { + .name = "UNUSED", + .in_event_mask = 0, + .out_state_mask = 0 + | S(MGWEP_ST_WAIT_MGW_RESPONSE) + , + }, + [MGWEP_ST_WAIT_MGW_RESPONSE] = { + .name = "WAIT_MGW_RESPONSE", + .onenter = mgwep_fsm_wait_mgw_response_onenter, + .action = mgwep_fsm_handle_ci_events, + .in_event_mask = 0xffffffff, + .out_state_mask = 0 + | S(MGWEP_ST_IN_USE) + , + }, + [MGWEP_ST_IN_USE] = { + .name = "IN_USE", + .onenter = mgwep_fsm_in_use_onenter, + .action = mgwep_fsm_handle_ci_events, + .in_event_mask = 0xffffffff, /* mgcp_client_fsm may send parent term anytime */ + .out_state_mask = 0 + | S(MGWEP_ST_WAIT_MGW_RESPONSE) + , + }, +}; + +static int mgwep_fsm_timer_cb(struct osmo_fsm_inst *fi) +{ + int i; + struct mgw_endpoint *mgwep = mgwep_fi_mgwep(fi); + + switch (fi->T) { + default: + for (i = 0; i < ARRAY_SIZE(mgwep->ci); i++) { + struct mgwep_ci *ci = &mgwep->ci[i]; + if (!ci->occupied) + continue; + if (!(ci->pending && ci->sent)) + continue; + on_failure(ci); + } + return 0; + } + + return 0; +} + +static struct osmo_fsm mgwep_fsm = { + .name = "mgw-endpoint", + .states = mgwep_fsm_states, + .num_states = ARRAY_SIZE(mgwep_fsm_states), + .log_subsys = DRSL, + .event_names = mgwep_fsm_event_names, + .timer_cb = mgwep_fsm_timer_cb, + /* The FSM termination will automatically trigger any mgcp_client_fsm instances to DLCX. */ +}; + +/* Depending on the channel mode and rate, return the codec type that is signalled towards the MGW. */ +enum mgcp_codecs chan_mode_to_mgcp_codec(enum gsm48_chan_mode chan_mode, bool full_rate) +{ + switch (chan_mode) { + case GSM48_CMODE_SPEECH_V1: + if (full_rate) + return CODEC_GSM_8000_1; + return CODEC_GSMHR_8000_1; + + case GSM48_CMODE_SPEECH_EFR: + return CODEC_GSMEFR_8000_1; + + case GSM48_CMODE_SPEECH_AMR: + return CODEC_AMR_8000_1; + + default: + return -1; + } +} + +void mgcp_pick_codec(struct mgcp_conn_peer *verb_info, const struct gsm_lchan *lchan) +{ + enum mgcp_codecs codec = chan_mode_to_mgcp_codec(lchan->tch_mode, + lchan->type == GSM_LCHAN_TCH_H? false : true); + if (codec < 0) { + LOG_LCHAN(lchan, LOGL_ERROR, + "Unable to determine MGCP codec type for %s in chan-mode %s\n", + gsm_lchant_name(lchan->type), gsm48_chan_mode_name(lchan->tch_mode)); + verb_info->codecs_len = 0; + } + + verb_info->codecs[0] = codec; + verb_info->codecs_len = 1; +} |