374 lines
12 KiB
C
374 lines
12 KiB
C
/* SMSCB Peer FSM: Represents state of one SMSCB for one peer (MME) */
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/* This FSM exists per tuple of (message, mme peer) */
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/* (C) 2019 by Harald Welte <laforge@gnumonks.org>
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* All Rights Reserved
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*
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* SPDX-License-Identifier: AGPL-3.0+
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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/utils.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/fsm.h>
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#include <osmocom/gsm/gsm23003.h>
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#include <osmocom/gsm/protocol/gsm_08_08.h>
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#include <osmocom/gsm/gsm0808_utils.h>
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#include <osmocom/sbcap/sbcap_common.h>
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#include <osmocom/cbc/cbc_message.h>
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#include <osmocom/cbc/cbc_peer.h>
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#include <osmocom/cbc/sbcap_link.h>
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#include <osmocom/cbc/sbcap_msg.h>
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#include <osmocom/cbc/debug.h>
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#include <osmocom/cbc/smscb_peer_fsm.h>
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#include <osmocom/cbc/smscb_message_fsm.h>
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#define S(x) (1 << (x))
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/***********************************************************************
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* Helper functions
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***********************************************************************/
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/* append SBcAP cells to msg_peer compl list */
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void msg_peer_append_compl_sbcap_bcast_area_list(struct cbc_message_peer *mp,
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const SBcAP_Broadcast_Scheduled_Area_List_t *bcast)
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{
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SBcAP_CellId_Broadcast_List_t *cell_id_bscat = bcast->cellId_Broadcast_List;
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A_SEQUENCE_OF(struct SBcAP_CellId_Broadcast_List_Item) *as_cell_id_bcast;
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SBcAP_CellId_Broadcast_List_Item_t *it;
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unsigned int i;
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if (!cell_id_bscat)
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return;
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as_cell_id_bcast = (void *) &cell_id_bscat->list;
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for (i = 0; i < as_cell_id_bcast->count; i++) {
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it = (SBcAP_CellId_Broadcast_List_Item_t *)(as_cell_id_bcast->array[i]);
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OSMO_ASSERT(it);
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struct cbc_cell_id *cci = NULL; // FIXME: lookup
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if (!cci) {
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cci = talloc_zero(mp, struct cbc_cell_id);
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if (!cci)
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return;
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llist_add_tail(&cci->list, &mp->num_compl_list);
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}
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cci_from_sbcap_bcast_cell_id(cci, it);
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LOGPFSML(mp->fi, LOGL_DEBUG, "Appending CellId %s to Broadcast Completed list\n",
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cbc_cell_id2str(cci));
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cci->num_compl.num_compl += 1;
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cci->num_compl.num_bcast_info += 1;
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}
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}
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/* append SBcAP cells to msg_peer fail list */
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void msg_peer_append_fail_sbcap_tai_list(struct cbc_message_peer *mp,
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const SBcAP_List_of_TAIs_t *tais)
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{
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A_SEQUENCE_OF(List_of_TAIs__Member) *as_tais = (void *)&tais->list;
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List_of_TAIs__Member *it;
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unsigned int i;
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for (i = 0; i < as_tais->count; i++) {
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it = (List_of_TAIs__Member *)(as_tais->array[i]);
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OSMO_ASSERT(it);
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struct cbc_cell_id *cci = NULL; // FIXME: lookup
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if (!cci) {
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cci = talloc_zero(mp, struct cbc_cell_id);
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if (!cci)
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return;
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llist_add_tail(&cci->list, &mp->fail_list);
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}
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cci_from_sbcap_tai(cci, &it->tai);
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cci->fail.cause = SBcAP_Cause_tracking_area_not_valid;
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LOGPFSML(mp->fi, LOGL_DEBUG, "Appending CellId %s (cause: %s) to Failed list\n",
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cbc_cell_id2str(cci), sbcap_cause_str(cci->fail.cause));
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}
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}
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/***********************************************************************
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* actual FSM
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***********************************************************************/
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static void smscb_p_fsm_init(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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struct cbc_message_peer *mp = (struct cbc_message_peer *) fi->priv;
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int rc;
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switch (event) {
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case SMSCB_PEER_E_CREATE:
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/* send it to peer */
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rc = peer_new_cbc_message(mp->peer, mp->cbcmsg);
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osmo_fsm_inst_state_chg(fi, SMSCB_S_WAIT_WRITE_ACK, 10, T_WAIT_WRITE_ACK);
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if (rc != 0) /* Immediately timeout the message */
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fi->fsm->timer_cb(fi);
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break;
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default:
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OSMO_ASSERT(0);
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}
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}
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static void smscb_p_fsm_wait_write_ack(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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struct cbc_message_peer *mp = (struct cbc_message_peer *) fi->priv;
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SBcAP_SBC_AP_PDU_t *sbcap = NULL;
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A_SEQUENCE_OF(void) *as_pdu;
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SBcAP_Write_Replace_Warning_Response_IEs_t *ie;
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switch (event) {
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case SMSCB_PEER_E_SBCAP_WRITE_ACK:
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sbcap = data;
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OSMO_ASSERT(sbcap->present == SBcAP_SBC_AP_PDU_PR_successfulOutcome);
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OSMO_ASSERT(sbcap->choice.successfulOutcome.procedureCode == SBcAP_ProcedureId_Write_Replace_Warning);
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as_pdu = (void *)&sbcap->choice.successfulOutcome.value.choice.Write_Replace_Warning_Response.protocolIEs.list;
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/* static const long asn_VAL_21_SBcAP_id_Unknown_Tracking_Area_List = 22; */
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ie = sbcap_as_find_ie(as_pdu, 22);
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if (ie) { /* IE is optional */
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OSMO_ASSERT(ie->value.present == SBcAP_Write_Replace_Warning_Response_IEs__value_PR_List_of_TAIs);
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msg_peer_append_fail_sbcap_tai_list(mp, &ie->value.choice.List_of_TAIs);
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}
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osmo_fsm_inst_state_chg(fi, SMSCB_S_ACTIVE, 0, 0);
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/* Signal parent fsm about completion */
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osmo_fsm_inst_dispatch(fi->proc.parent, SMSCB_MSG_E_WRITE_ACK, mp);
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break;
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case SMSCB_PEER_E_SBCAP_WRITE_NACK:
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osmo_fsm_inst_state_chg(fi, SMSCB_S_ACTIVE, 0, 0);
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/* Signal parent fsm about completion */
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osmo_fsm_inst_dispatch(fi->proc.parent, SMSCB_MSG_E_WRITE_NACK, mp);
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break;
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default:
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OSMO_ASSERT(0);
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}
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}
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static void smscb_p_fsm_active(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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//struct cbc_message_peer *mp = (struct cbc_message_peer *) fi->priv;
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switch (event) {
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case SMSCB_PEER_E_REPLACE: /* send WRITE-REPLACE to MME */
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/* NOT IMPLEMENETED */
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osmo_fsm_inst_state_chg(fi, SMSCB_S_WAIT_REPLACE_ACK, 10, T_WAIT_REPLACE_ACK);
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break;
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case SMSCB_PEER_E_STATUS:
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/* NOT IMPLEMENETED */
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osmo_fsm_inst_state_chg(fi, SMSCB_S_WAIT_STATUS_ACK, 10, T_WAIT_STATUS_ACK);
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break;
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default:
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OSMO_ASSERT(0);
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}
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}
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static void smscb_p_fsm_wait_status_ack(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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//struct cbc_message_peer *mp = (struct cbc_message_peer *) fi->priv;
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switch (event) {
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/* NOT IMPLEMENETED */
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default:
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OSMO_ASSERT(0);
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}
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}
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static void smscb_p_fsm_wait_replace_ack(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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//struct cbc_message_peer *mp = (struct cbc_message_peer *) fi->priv;
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switch (event) {
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/* NOT IMPLEMENETED */
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default:
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OSMO_ASSERT(0);
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}
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}
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static void smscb_p_fsm_wait_delete_ack(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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struct cbc_message_peer *mp = (struct cbc_message_peer *) fi->priv;
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switch (event) {
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case SMSCB_PEER_E_SBCAP_DELETE_ACK:
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//pdu = data;
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osmo_fsm_inst_state_chg(fi, SMSCB_S_DELETED, 0, 0);
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/* Signal parent fsm about completion */
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osmo_fsm_inst_dispatch(fi->proc.parent, SMSCB_MSG_E_DELETE_ACK, mp);
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break;
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case SMSCB_PEER_E_SBCAP_DELETE_NACK:
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//pdu = data;
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osmo_fsm_inst_state_chg(fi, SMSCB_S_DELETED, 0, 0);
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/* Signal parent fsm about completion */
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osmo_fsm_inst_dispatch(fi->proc.parent, SMSCB_MSG_E_DELETE_NACK, mp);
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break;
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default:
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OSMO_ASSERT(0);
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}
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}
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static int smscb_p_fsm_timer_cb(struct osmo_fsm_inst *fi)
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{
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switch (fi->T) {
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case T_WAIT_WRITE_ACK:
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osmo_fsm_inst_state_chg(fi, SMSCB_S_ACTIVE, 0, 0);
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osmo_fsm_inst_dispatch(fi->proc.parent, SMSCB_MSG_E_WRITE_NACK, NULL);
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break;
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case T_WAIT_REPLACE_ACK:
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osmo_fsm_inst_state_chg(fi, SMSCB_S_ACTIVE, 0, 0);
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osmo_fsm_inst_dispatch(fi->proc.parent, SMSCB_MSG_E_REPLACE_NACK, NULL);
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break;
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case T_WAIT_STATUS_ACK:
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osmo_fsm_inst_state_chg(fi, SMSCB_S_ACTIVE, 0, 0);
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osmo_fsm_inst_dispatch(fi->proc.parent, SMSCB_MSG_E_STATUS_NACK, NULL);
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break;
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case T_WAIT_DELETE_ACK:
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osmo_fsm_inst_state_chg(fi, SMSCB_S_DELETED, 0, 0);
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osmo_fsm_inst_dispatch(fi->proc.parent, SMSCB_MSG_E_DELETE_NACK, NULL);
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break;
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default:
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OSMO_ASSERT(0);
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}
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return 0;
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}
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static void smscb_p_fsm_allstate(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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struct cbc_message_peer *mp = (struct cbc_message_peer *) fi->priv;
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SBcAP_SBC_AP_PDU_t *sbcap;
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A_SEQUENCE_OF(void) *as_pdu;
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SBcAP_Write_Replace_Warning_Indication_IEs_t *ie;
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int rc;
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switch (event) {
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case SMSCB_PEER_E_DELETE: /* send Stop-Warning to MME */
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switch (fi->state) {
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case SMSCB_S_DELETED:
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case SMSCB_S_INIT:
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LOGPFSML(fi, LOGL_ERROR, "Event %s not permitted\n",
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osmo_fsm_event_name(fi->fsm, event));
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return;
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default:
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break;
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}
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if ((sbcap = sbcap_gen_stop_warning_req(mp->peer, mp->cbcmsg))) {
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rc = cbc_sbcap_link_tx(mp->peer->link.sbcap, sbcap);
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} else {
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LOGP(DSBcAP, LOGL_ERROR,
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"[%s] Tx SBc-AP Stop-Warning-Request: msg gen failed\n",
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mp->peer->name);
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rc = -1;
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}
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osmo_fsm_inst_state_chg(fi, SMSCB_S_WAIT_DELETE_ACK, 10, T_WAIT_DELETE_ACK);
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if (rc != 0) /* Immediately timeout the message */
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fi->fsm->timer_cb(fi);
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break;
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case SMSCB_PEER_E_SBCAP_WRITE_IND:
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sbcap = (SBcAP_SBC_AP_PDU_t *)data;
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OSMO_ASSERT(sbcap->present == SBcAP_SBC_AP_PDU_PR_initiatingMessage);
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OSMO_ASSERT(sbcap->choice.initiatingMessage.procedureCode == SBcAP_ProcedureId_Write_Replace_Warning_Indication);
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as_pdu = (void *)&sbcap->choice.initiatingMessage.value.choice.Write_Replace_Warning_Indication.protocolIEs.list;
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/* static const long asn_VAL_36_SBcAP_id_Broadcast_Scheduled_Area_List = 23; */
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ie = sbcap_as_find_ie(as_pdu, 23);
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if (!ie)
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return; /* IE is optional */
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OSMO_ASSERT(ie->value.present == SBcAP_Write_Replace_Warning_Indication_IEs__value_PR_Broadcast_Scheduled_Area_List);
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msg_peer_append_compl_sbcap_bcast_area_list(mp, &ie->value.choice.Broadcast_Scheduled_Area_List);
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break;
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default:
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OSMO_ASSERT(0);
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}
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}
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static void smscb_p_fsm_cleanup(struct osmo_fsm_inst *fi, enum osmo_fsm_term_cause cause)
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{
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struct cbc_message_peer *mp = (struct cbc_message_peer *) fi->priv;
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llist_del(&mp->list);
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/* memory of mp is child of fi and hence automatically free'd */
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}
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static const struct osmo_fsm_state smscb_p_fsm_states[] = {
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[SMSCB_S_INIT] = {
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.name = "INIT",
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.in_event_mask = S(SMSCB_PEER_E_CREATE),
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.out_state_mask = S(SMSCB_S_WAIT_WRITE_ACK) |
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S(SMSCB_S_ACTIVE),
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.action = smscb_p_fsm_init,
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},
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[SMSCB_S_WAIT_WRITE_ACK] = {
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.name = "WAIT_WRITE_ACK",
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.in_event_mask = S(SMSCB_PEER_E_SBCAP_WRITE_ACK) |
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S(SMSCB_PEER_E_SBCAP_WRITE_NACK),
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.out_state_mask = S(SMSCB_S_ACTIVE) |
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S(SMSCB_S_WAIT_DELETE_ACK),
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.action = smscb_p_fsm_wait_write_ack,
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},
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[SMSCB_S_ACTIVE] = {
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.name = "ACTIVE",
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.in_event_mask = S(SMSCB_PEER_E_REPLACE) |
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S(SMSCB_PEER_E_STATUS),
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.out_state_mask = S(SMSCB_S_WAIT_REPLACE_ACK) |
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S(SMSCB_S_WAIT_STATUS_ACK) |
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S(SMSCB_S_WAIT_DELETE_ACK),
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.action = smscb_p_fsm_active,
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},
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[SMSCB_S_WAIT_STATUS_ACK] = {
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.name = "WAIT_STATUS_ACK",
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.in_event_mask = 0 /* NOT IMPLEMENTED */,
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.out_state_mask = S(SMSCB_S_ACTIVE) |
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S(SMSCB_S_WAIT_DELETE_ACK),
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.action = smscb_p_fsm_wait_status_ack,
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},
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[SMSCB_S_WAIT_REPLACE_ACK] = {
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.name = "WAIT_REPLACE_ACK",
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.in_event_mask = 0 /* NOT IMPLEMENTED */,
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.out_state_mask = S(SMSCB_S_ACTIVE) |
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S(SMSCB_S_WAIT_DELETE_ACK),
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.action = smscb_p_fsm_wait_replace_ack,
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},
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[SMSCB_S_WAIT_DELETE_ACK] = {
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.name = "WAIT_DELETE_ACK",
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.in_event_mask = S(SMSCB_PEER_E_SBCAP_DELETE_ACK) |
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S(SMSCB_PEER_E_SBCAP_DELETE_NACK),
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.out_state_mask = S(SMSCB_S_DELETED),
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.action = smscb_p_fsm_wait_delete_ack,
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},
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[SMSCB_S_DELETED] = {
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.name = "DELETED",
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},
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};
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struct osmo_fsm sbcap_smscb_peer_fsm = {
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.name = "SMSCB-PEER-SBcAP",
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.states = smscb_p_fsm_states,
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.num_states = ARRAY_SIZE(smscb_p_fsm_states),
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.allstate_event_mask = S(SMSCB_PEER_E_DELETE) |
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S(SMSCB_PEER_E_SBCAP_WRITE_IND),
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.allstate_action = smscb_p_fsm_allstate,
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.timer_cb = smscb_p_fsm_timer_cb,
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.log_subsys = DSBcAP,
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.event_names = smscb_peer_fsm_event_names,
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.cleanup = smscb_p_fsm_cleanup,
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};
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static __attribute__((constructor)) void on_dso_load_smscb_p_fsm(void)
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{
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OSMO_ASSERT(osmo_fsm_register(&sbcap_smscb_peer_fsm) == 0);
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}
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