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/*
* (C) 2019 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de>
* All Rights Reserved
*
* SPDX-License-Identifier: AGPL-3.0+
*
* Author: Neels Hofmeyr
*
* 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 <osmocom/msc/gsm_data.h>
#include <osmocom/msc/paging.h>
#include <osmocom/msc/vlr.h>
#include <osmocom/msc/ran_peer.h>
#include <osmocom/msc/sgs_iface.h>
#include <osmocom/msc/signal.h>
#include <osmocom/msc/msc_a.h>
#include <osmocom/msc/transaction.h>
#define LOG_PAGING(vsub, paging_request, level, fmt, args ...) \
LOGP(DPAG, level, "Paging: %s%s%s: " fmt, \
vlr_subscr_name(vsub), paging_request ? " for " : "", paging_request ? (paging_request)->label : "", ## args)
#define VSUB_USE_PAGING "Paging"
const struct value_string paging_cause_names[] = {
{ PAGING_CAUSE_CALL_CONVERSATIONAL, "CALL_CONVERSATIONAL" },
{ PAGING_CAUSE_CALL_STREAMING, "CALL_STREAMING" },
{ PAGING_CAUSE_CALL_INTERACTIVE, "CALL_INTERACTIVE" },
{ PAGING_CAUSE_CALL_BACKGROUND, "CALL_BACKGROUND" },
{ PAGING_CAUSE_SIGNALLING_LOW_PRIO, "SIGNALLING_LOW_PRIO" },
{ PAGING_CAUSE_SIGNALLING_HIGH_PRIO, "SIGNALLING_HIGH_PRIO" },
{ PAGING_CAUSE_UNSPECIFIED, "UNSPECIFIED" },
{}
};
static void paging_response_timer_cb(void *data)
{
struct vlr_subscr *vsub = data;
if (vsub->cs.attached_via_ran == OSMO_RAT_EUTRAN_SGS)
sgs_iface_tx_serv_abrt(vsub);
paging_expired(vsub);
}
/* Execute a paging on the currently active RAN. Returns the number of
* delivered paging requests or -EINVAL in case of failure. */
static int msc_paging_request(struct paging_request *pr, struct vlr_subscr *vsub)
{
struct gsm_network *net = vsub->vlr->user_ctx;
/* The subscriber was last seen in subscr->lac. Find out which
* BSCs/RNCs are responsible and send them a paging request via open
* SCCP connections (if any). */
switch (vsub->cs.attached_via_ran) {
case OSMO_RAT_GERAN_A:
return ran_peers_down_paging(net->a.sri, CELL_IDENT_LAC, vsub, pr->cause);
case OSMO_RAT_UTRAN_IU:
return ran_peers_down_paging(net->iu.sri, CELL_IDENT_LAC, vsub, pr->cause);
case OSMO_RAT_EUTRAN_SGS:
return sgs_iface_tx_paging(vsub, sgs_serv_ind_from_paging_cause(pr->cause));
default:
LOG_PAGING(vsub, pr, LOGL_ERROR, "Cannot page, subscriber not attached\n");
return -EINVAL;
}
}
struct paging_request *paging_request_start(struct vlr_subscr *vsub, enum paging_cause cause,
paging_cb_t paging_cb, struct gsm_trans *trans,
const char *label)
{
int rc;
struct paging_request *pr;
struct gsm_network *net = vsub->vlr->user_ctx;
pr = talloc(vsub, struct paging_request);
OSMO_ASSERT(pr);
*pr = (struct paging_request){
.label = label,
.cause = cause,
.paging_cb = paging_cb,
.trans = trans,
};
if (vsub->cs.is_paging) {
LOG_PAGING(vsub, pr, LOGL_DEBUG, "Already paging, not starting another request\n");
} else {
LOG_PAGING(vsub, pr, LOGL_DEBUG, "Starting paging\n");
rc = msc_paging_request(pr, vsub);
if (rc <= 0) {
LOG_PAGING(vsub, pr, LOGL_ERROR, "Starting paging failed (rc=%d)\n", rc);
talloc_free(pr);
return NULL;
}
/* reduced on the first paging callback */
vlr_subscr_get(vsub, VSUB_USE_PAGING);
vsub->cs.is_paging = true;
osmo_timer_setup(&vsub->cs.paging_response_timer, paging_response_timer_cb, vsub);
osmo_timer_schedule(&vsub->cs.paging_response_timer, net->paging_response_timer, 0);
}
llist_add_tail(&pr->entry, &vsub->cs.requests);
return pr;
}
void paging_request_remove(struct paging_request *pr)
{
struct gsm_trans *trans = pr->trans;
struct vlr_subscr *vsub = trans ? trans->vsub : NULL;
LOG_PAGING(vsub, pr, LOGL_DEBUG, "Removing Paging Request\n");
if (pr->trans && pr->trans->paging_request == pr)
pr->trans->paging_request = NULL;
llist_del(&pr->entry);
talloc_free(pr);
}
static void paging_concludes(struct vlr_subscr *vsub, struct msc_a *msc_a)
{
struct paging_request *pr, *pr_next;
struct paging_signal_data sig_data;
osmo_timer_del(&vsub->cs.paging_response_timer);
llist_for_each_entry_safe(pr, pr_next, &vsub->cs.requests, entry) {
struct gsm_trans *trans = pr->trans;
paging_cb_t paging_cb = pr->paging_cb;
LOG_PAGING(vsub, pr, LOGL_DEBUG, "Paging Response action (%s)%s\n",
msc_a ? "success" : "expired",
paging_cb ? "" : " (no action defined)");
/* Remove the paging request before the paging_cb could deallocate e.g. the trans */
paging_request_remove(pr);
pr = NULL;
if (paging_cb)
paging_cb(msc_a, trans);
}
/* Inform parts of the system we don't know */
sig_data = (struct paging_signal_data){
.vsub = vsub,
.msc_a = msc_a,
};
osmo_signal_dispatch(SS_PAGING, msc_a ? S_PAGING_SUCCEEDED : S_PAGING_EXPIRED, &sig_data);
/* balanced with the moment we start paging */
if (vsub->cs.is_paging) {
vsub->cs.is_paging = false;
vlr_subscr_put(vsub, VSUB_USE_PAGING);
}
/* Handling of the paging requests has usually added transactions, which keep the msc_a connection active. If
* there are none, then this probably marks release of the connection. */
if (msc_a)
msc_a_put(msc_a, MSC_A_USE_PAGING_RESPONSE);
}
void paging_response(struct msc_a *msc_a)
{
paging_concludes(msc_a_vsub(msc_a), msc_a);
}
void paging_expired(struct vlr_subscr *vsub)
{
paging_concludes(vsub, NULL);
}
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