212 lines
5.7 KiB
C
212 lines
5.7 KiB
C
/* Osmocom CBC (Cell Broacast Centre) */
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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 <string.h>
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#include <errno.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/utils.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/cbc/cbsp_msg.h>
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#include <osmocom/cbc/cbsp_link.h>
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#include <osmocom/cbc/sbcap_msg.h>
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#include <osmocom/cbc/sbcap_link.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/debug.h>
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#include <osmocom/cbc/rest_it_op.h>
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#include <osmocom/cbc/smscb_message_fsm.h>
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/* determine if peer is within scope of cbc_msg */
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static bool is_peer_in_scope(const struct cbc_peer *peer, const struct cbc_message *cbcmsg)
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{
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switch (cbcmsg->scope) {
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case CBC_MSG_SCOPE_PLMN:
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return true;
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/* FIXME: differnt scopes */
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default:
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OSMO_ASSERT(0);
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}
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}
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/* send given new message to given peer */
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int peer_new_cbc_message(struct cbc_peer *peer, struct cbc_message *cbcmsg)
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{
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struct osmo_cbsp_decoded *cbsp;
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SBcAP_SBC_AP_PDU_t *sbcap;
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switch (peer->proto) {
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case CBC_PEER_PROTO_CBSP:
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/* skip peers without any current CBSP connection */
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if (!peer->link.cbsp) {
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LOGP(DCBSP, LOGL_NOTICE, "[%s] Tx CBSP: not connected\n",
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peer->name);
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return -ENOTCONN;
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}
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if (!(cbsp = cbsp_gen_write_replace_req(peer, cbcmsg))) {
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LOGP(DCBSP, LOGL_ERROR, "[%s] Tx CBSP: msg gen failed\n",
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peer->name);
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return -EINVAL;
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}
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return cbc_cbsp_link_tx(peer->link.cbsp, cbsp);
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case CBC_PEER_PROTO_SBcAP:
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/* skip peers without any current SBc-AP connection */
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if (!peer->link.sbcap) {
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LOGP(DSBcAP, LOGL_NOTICE, "[%s] Tx SBc-AP: not connected\n",
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peer->name);
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return -ENOTCONN;
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}
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if (!(sbcap = sbcap_gen_write_replace_warning_req(peer, cbcmsg))) {
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LOGP(DSBcAP, LOGL_ERROR, "[%s] Tx SBc-AP: msg gen failed\n",
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peer->name);
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return -EINVAL;
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}
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return cbc_sbcap_link_tx(peer->link.sbcap, sbcap);
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case CBC_PEER_PROTO_SABP:
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LOGP(DLGLOBAL, LOGL_ERROR, "Sending message to peer proto %s not implemented!\n",
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get_value_string(cbc_peer_proto_name, peer->proto));
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return -1;
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default:
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OSMO_ASSERT(0);
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}
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}
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/* receive a new CBC message from the user (REST). Allocates new memory,
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* a FSM, copies data from 'orig', routes to all peers and starts FSMs.
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* Once the operation is complete (success, error, timeout) we must
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* notify osmo_it_q of the completion */
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int cbc_message_new(const struct cbc_message *orig, struct rest_it_op *op)
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{
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struct cbc_message *cbcmsg = cbc_message_alloc(g_cbc, orig);
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struct cbc_peer *peer;
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if (!cbcmsg) {
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rest_it_op_set_http_result(op, 409, "Could not allocate");
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rest_it_op_complete(op);
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return -ENOMEM;
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}
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OSMO_ASSERT(llist_empty(&cbcmsg->peers));
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/* iterate over all peers */
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llist_for_each_entry(peer, &g_cbc->peers, list) {
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struct cbc_message_peer *mp;
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if (!is_peer_in_scope(peer, cbcmsg))
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continue;
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/* allocate new cbc_mesage_peer + related FSM */
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mp = smscb_peer_fsm_alloc(peer, cbcmsg);
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if (!mp) {
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LOGP(DCBSP, LOGL_ERROR, "Cannot allocate cbc_message_peer\n");
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continue;
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}
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}
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/* kick off the state machine[s] */
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if (osmo_fsm_inst_dispatch(cbcmsg->fi, SMSCB_MSG_E_CREATE, op) < 0) {
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rest_it_op_set_http_result(op, 500, "Illegal FSM event");
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rest_it_op_complete(op);
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}
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/* we continue in the FSM after the WRITE_ACK event was received */
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return 0;
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}
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void cbc_message_delete(struct cbc_message *cbcmsg, struct rest_it_op *op)
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{
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if (osmo_fsm_inst_dispatch(cbcmsg->fi, SMSCB_MSG_E_DELETE, op) < 0) {
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rest_it_op_set_http_result(op, 500, "Illegal FSM event");
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rest_it_op_complete(op);
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}
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/* we continue in the FSM after the DELETE_ACK event was received */
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}
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struct cbc_message *cbc_message_by_id(uint16_t message_id)
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{
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struct cbc_message *cbc_msg;
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llist_for_each_entry(cbc_msg, &g_cbc->messages, list) {
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if (cbc_msg->msg.message_id == message_id)
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return cbc_msg;
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}
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return NULL;
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}
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struct cbc_message *cbc_message_expired_by_id(uint16_t message_id)
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{
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struct cbc_message *cbc_msg;
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llist_for_each_entry(cbc_msg, &g_cbc->expired_messages, list) {
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if (cbc_msg->msg.message_id == message_id)
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return cbc_msg;
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}
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return NULL;
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}
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/* remove a peer from the message */
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int cbc_message_del_peer(struct cbc_message *cbcmsg, struct cbc_peer *peer)
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{
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struct cbc_message_peer *mp, *mp2;
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unsigned int i = 0;
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llist_for_each_entry_safe(mp, mp2, &cbcmsg->peers, list) {
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if (mp->peer == peer) {
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llist_del(&mp->list);
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talloc_free(mp);
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i++;
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}
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}
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OSMO_ASSERT(i == 0 || i == 1);
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return i;
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}
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struct cbc_message_peer *cbc_message_peer_get(struct cbc_message *cbcmsg, struct cbc_peer *peer)
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{
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struct cbc_message_peer *mp;
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llist_for_each_entry(mp, &cbcmsg->peers, list) {
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if (mp->peer == peer)
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return mp;
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}
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return NULL;
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}
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#if 0
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/* add a new peer to the message */
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int cbc_message_add_peer(struct cbc_message *cbcmsg, struct cbc_peer *peer)
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{
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struct cbc_message_peer *mp = talloc_zero(cbcmsg, struct cbc_message_peer);
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if (mp)
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return -ENOMEM;
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mp->peer = peer;
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llist_add_tail(&mp->list, &cbcmsg->peers);
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return 0;
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}
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#endif
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