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-rw-r--r--src/osmo-bsc/mgw_endpoint_fsm.c752
1 files changed, 752 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..50f507488
--- /dev/null
+++ b/src/osmo-bsc/mgw_endpoint_fsm.c
@@ -0,0 +1,752 @@
+/* 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 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)
+{
+ static char buf[128];
+
+ 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)
+{
+ static bool g_initialized = false;
+ g_T_defs = T_defs;
+ if (!g_initialized) {
+ OSMO_ASSERT(osmo_fsm_register(&mgwep_fsm) == 0);
+ fill_event_names();
+ g_initialized = true;
+ }
+}
+
+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",
+ 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");
+
+ 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'",
+ rtp_info->endpoint);
+ mgw_endpoint_ci_dlcx(ci);
+ on_failure(ci);
+ return;
+ }
+ }
+ break;
+
+ case MGCP_VERB_MDCX:
+ /* If an MDCX succeeded, remember the new port information */
+ ci->got_port_info = true;
+ ci->rtp_info = ci->verb_info;
+ break;
+
+ default:
+ break;
+ }
+
+ LOG_CI(ci, LOGL_DEBUG, "received successful response to %s RTP=%s%s",
+ 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",
+ 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",
+ 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(ci, LOGL_DEBUG, "%s, notify=%s",
+ mgcp_verb_name(ci->verb), 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.",
+ 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");
+ on_failure(ci);
+ return;
+ }
+ break;
+
+ case MGCP_VERB_MDCX:
+ case MGCP_VERB_DLCX:
+ if (!ci->mgcp_client_fi) {
+ LOG_CI(ci, LOGL_ERROR, "The first verb on an unused MGW endpoint CI must be CRCX, not %s",
+ mgcp_verb_name(ci->verb));
+ on_failure(ci);
+ return;
+ }
+ break;
+
+ default:
+ LOG_CI(ci, LOGL_ERROR, "This verb is not supported: %s", mgcp_verb_name(ci->verb));
+ on_failure(ci);
+ return;
+ }
+
+ ci->pending = true;
+
+ LOG_CI(ci, LOGL_DEBUG, "Scheduling MGCP: %s (%s:%u)",
+ mgcp_verb_name(ci->verb), ci->verb_info.addr, ci->verb_info.port);
+
+ 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(ci, LOGL_DEBUG, "Sending MGCP: %s %s:%u",
+ mgcp_verb_name(ci->verb), ci->verb_info.addr, ci->verb_info.port);
+ 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(ci, LOGL_ERROR, "Error sending MGCP: %s %s:%u",
+ mgcp_verb_name(ci->verb), ci->verb_info.addr, ci->verb_info.port);
+ 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(ci, LOGL_DEBUG, "Sending MGCP: %s %s %s:%u",
+ mgcp_verb_name(ci->verb), ci->mgcp_ci_str, ci->verb_info.addr, ci->verb_info.port);
+ rc = mgcp_conn_modify(ci->mgcp_client_fi, CI_EV_SUCCESS(ci), &ci->verb_info);
+ ci->sent = true;
+ if (rc) {
+ LOG_CI(ci, LOGL_ERROR, "Error sending MGCP: %s %s:%u (rc=%d %s)",
+ mgcp_verb_name(ci->verb), ci->verb_info.addr, ci->verb_info.port,
+ rc, strerror(-rc));
+ on_failure(ci);
+ }
+ break;
+
+ case MGCP_VERB_DLCX:
+ LOG_CI(ci, LOGL_DEBUG, "Sending MGCP: %s %s",
+ 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(ci, LOGL_DEBUG, "verb=%s, %s",
+ mgcp_verb_name(ci->verb),
+ ci->sent ? "waiting for response" : "waiting to be sent");
+ else
+ LOG_CI(ci, LOGL_DEBUG, "%s",
+ 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", 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", 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;
+}