270 lines
7.2 KiB
C
270 lines
7.2 KiB
C
/* MSC subscriber connection implementation */
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/*
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* (C) 2016 by sysmocom s.m.f.c. <info@sysmocom.de>
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* All Rights Reserved
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*
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* Author: Neels Hofmeyr
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <osmocom/core/logging.h>
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#include <osmocom/core/fsm.h>
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#include <openbsc/osmo_msc.h>
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#include <openbsc/vlr.h>
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#include <openbsc/debug.h>
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#include <openbsc/transaction.h>
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static const struct value_string subscr_conn_fsm_event_names[] = {
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OSMO_VALUE_STRING(SUBSCR_CONN_E_INVALID),
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OSMO_VALUE_STRING(SUBSCR_CONN_E_ACCEPTED),
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OSMO_VALUE_STRING(SUBSCR_CONN_E_BUMP),
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OSMO_VALUE_STRING(SUBSCR_CONN_E_MO_CLOSE),
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OSMO_VALUE_STRING(SUBSCR_CONN_E_CN_CLOSE),
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OSMO_VALUE_STRING(SUBSCR_CONN_E_CLOSE_CONF),
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{ 0, NULL }
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};
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const struct value_string subscr_conn_from_names[] = {
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OSMO_VALUE_STRING(SUBSCR_CONN_FROM_INVALID),
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OSMO_VALUE_STRING(SUBSCR_CONN_FROM_LU),
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OSMO_VALUE_STRING(SUBSCR_CONN_FROM_CM_SERVICE_REQ),
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OSMO_VALUE_STRING(SUBSCR_CONN_FROM_PAGING_RESP),
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{ 0, NULL }
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};
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static void paging_resp(struct gsm_subscriber_connection *conn,
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enum gsm_paging_event pe)
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{
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subscr_paging_dispatch(GSM_HOOK_RR_PAGING, pe, NULL, conn, conn->subscr);
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}
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void subscr_conn_fsm_new(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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struct gsm_subscriber_connection *conn = fi->priv;
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enum subscr_conn_from from = SUBSCR_CONN_FROM_INVALID;
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enum gsm_paging_event pe;
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if (data) {
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from = *(enum subscr_conn_from*)data;
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LOGPFSM(fi, "%s\n", subscr_conn_from_name(from));
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}
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/* If accepted, transition the state, all other cases mean failure. */
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switch (event) {
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case SUBSCR_CONN_E_ACCEPTED:
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osmo_fsm_inst_state_chg(fi, SUBSCR_CONN_S_ACCEPTED, 0, 0);
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break;
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case SUBSCR_CONN_E_MO_CLOSE:
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case SUBSCR_CONN_E_CN_CLOSE:
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case SUBSCR_CONN_E_CLOSE_CONF:
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break;
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default:
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LOGPFSM(fi, "Unexpected event: %d %s\n",
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event, osmo_fsm_event_name(fi->fsm, event));
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break;
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}
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/* if appropriate, signal paging success or failure */
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if (from == SUBSCR_CONN_FROM_PAGING_RESP) {
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pe = (fi->state == SUBSCR_CONN_S_ACCEPTED)?
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GSM_PAGING_SUCCEEDED : GSM_PAGING_EXPIRED;
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paging_resp(conn, pe);
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}
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/* On failure, discard the conn */
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if (fi->state != SUBSCR_CONN_S_ACCEPTED) {
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/* TODO: on MO_CLOSE or CN_CLOSE, first go to RELEASING and
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* await BSC confirmation? */
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osmo_fsm_inst_state_chg(fi, SUBSCR_CONN_S_RELEASED, 0, 0);
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return;
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}
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/* On success, handle pending requests and/or close conn */
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if (from == SUBSCR_CONN_FROM_CM_SERVICE_REQ) {
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conn->received_cm_service_request = true;
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LOGPFSM(fi, "received_cm_service_request = true\n");
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}
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osmo_fsm_inst_dispatch(fi, SUBSCR_CONN_E_BUMP, data);
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}
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#if 0
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case SUBSCR_CONN_E_PARQ_SUCCESS:
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osmo_fsm_inst_state_chg(fi, SUBSCR_CONN_S_ACCEPTED, 0, 0);
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accept_conn = true;
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/* fall through */
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case SUBSCR_CONN_E_PARQ_FAILURE:
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parq_type = data ? *(enum vlr_parq_type*)data : VLR_PR_ARQ_T_INVALID;
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switch (parq_type) {
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case VLR_PR_ARQ_T_CM_SERV_REQ:
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accept_conn = handle_cm_serv_result(fi, accept_conn);
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break;
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case VLR_PR_ARQ_T_PAGING_RESP:
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accept_conn = handle_paging_result(fi, accept_conn);
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break;
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default:
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LOGPFSML(fi, LOGL_ERROR,
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"Invalid VLR Process Access Request type"
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" %d\n", parq_type);
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accept_conn = false;
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break;
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}
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break;
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#endif
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static void subscr_conn_fsm_bump(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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struct gsm_subscriber_connection *conn = fi->priv;
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if (conn->silent_call)
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return;
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if (conn->received_cm_service_request)
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return;
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/* is this needed? */
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if (conn->subscr && !llist_empty(&conn->subscr->requests))
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return;
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if (trans_has_conn(conn))
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return;
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osmo_fsm_inst_state_chg(fi, SUBSCR_CONN_S_RELEASED, 0, 0);
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}
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static void subscr_conn_fsm_accepted(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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switch (event) {
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case SUBSCR_CONN_E_BUMP:
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subscr_conn_fsm_bump(fi, event, data);
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return;
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default:
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break;
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}
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/* Whatever unexpected happens in the accepted state, it means release.
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* Even if an unexpected event is passed, the safest thing to do is
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* discard the conn. We don't expect another SUBSCR_CONN_E_ACCEPTED. */
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osmo_fsm_inst_state_chg(fi, SUBSCR_CONN_S_RELEASED, 0, 0);
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}
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static void subscr_conn_fsm_release(struct osmo_fsm_inst *fi, uint32_t prev_state)
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{
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struct gsm_subscriber_connection *conn = fi->priv;
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if (!conn)
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return;
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/* temporary hack, see owned_by_msc */
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if (!conn->owned_by_msc) {
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DEBUGP(DMM, "%s leaving bsc_subscr_con_free() to bsc_api.c, owned_by_msc = false\n",
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subscr_name(conn->subscr));
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return;
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}
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DEBUGP(DMM, "%s calling bsc_subscr_con_free(), owned_by_msc = true\n",
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subscr_name(conn->subscr));
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gsm0808_clear(conn);
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bsc_subscr_con_free(conn);
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}
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#define S(x) (1 << (x))
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static const struct osmo_fsm_state subscr_conn_fsm_states[] = {
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[SUBSCR_CONN_S_NEW] = {
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.name = OSMO_STRINGIFY(SUBSCR_CONN_S_NEW),
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.in_event_mask = S(SUBSCR_CONN_E_ACCEPTED) |
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S(SUBSCR_CONN_E_MO_CLOSE) |
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S(SUBSCR_CONN_E_CN_CLOSE) |
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S(SUBSCR_CONN_E_CLOSE_CONF),
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.out_state_mask = S(SUBSCR_CONN_S_ACCEPTED) |
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S(SUBSCR_CONN_S_RELEASED),
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.action = subscr_conn_fsm_new,
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},
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[SUBSCR_CONN_S_ACCEPTED] = {
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.name = OSMO_STRINGIFY(SUBSCR_CONN_S_ACCEPTED),
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/* allow everything to release for any odd behavior */
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.in_event_mask = S(SUBSCR_CONN_E_ACCEPTED) |
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S(SUBSCR_CONN_E_BUMP) |
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S(SUBSCR_CONN_E_MO_CLOSE) |
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S(SUBSCR_CONN_E_CN_CLOSE) |
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S(SUBSCR_CONN_E_CLOSE_CONF),
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.out_state_mask = S(SUBSCR_CONN_S_RELEASED),
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.action = subscr_conn_fsm_accepted,
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},
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[SUBSCR_CONN_S_RELEASED] = {
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.name = OSMO_STRINGIFY(SUBSCR_CONN_S_RELEASED),
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.onenter = subscr_conn_fsm_release,
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},
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};
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static struct osmo_fsm subscr_conn_fsm = {
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.name = "Subscr_Conn",
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.states = subscr_conn_fsm_states,
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.num_states = ARRAY_SIZE(subscr_conn_fsm_states),
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.allstate_event_mask = 0,
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.allstate_action = NULL,
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.log_subsys = DVLR,
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.event_names = subscr_conn_fsm_event_names,
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};
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int msc_create_conn_fsm(struct gsm_subscriber_connection *conn, const char *id)
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{
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struct osmo_fsm_inst *fi;
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OSMO_ASSERT(conn);
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if (conn->conn_fsm) {
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LOGP(DMM, LOGL_ERROR,
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"%s: Error: connection already in use\n", id);
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return -EINVAL;
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}
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fi = osmo_fsm_inst_alloc(&subscr_conn_fsm, conn, conn, LOGL_DEBUG, id);
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if (!fi) {
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LOGP(DMM, LOGL_ERROR,
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"%s: Failed to allocate subscr conn master FSM\n", id);
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return -ENOMEM;
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}
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conn->conn_fsm = fi;
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return 0;
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}
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bool msc_subscr_conn_is_accepted(struct gsm_subscriber_connection *conn)
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{
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if (!conn)
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return false;
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if (!conn->subscr)
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return false;
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if (!conn->conn_fsm)
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return false;
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if (conn->conn_fsm->state != SUBSCR_CONN_S_ACCEPTED)
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return false;
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return true;
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}
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void msc_subscr_conn_init(void)
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{
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osmo_fsm_register(&subscr_conn_fsm);
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}
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