191 lines
5.5 KiB
C
191 lines
5.5 KiB
C
/* The concept of a subscriber for the MSC, roughly HLR/VLR functionality */
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/* (C) 2008 by Harald Welte <laforge@gnumonks.org>
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* (C) 2009,2013 by Holger Hans Peter Freyther <zecke@selfish.org>
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*
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* All Rights Reserved
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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 "../../bscconfig.h"
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include <time.h>
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#include <stdbool.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/vty/vty.h>
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#ifdef BUILD_IU
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#include <osmocom/ranap/iu_client.h>
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#else
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#include <osmocom/msc/iu_dummy.h>
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#endif
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#include <osmocom/msc/gsm_subscriber.h>
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#include <osmocom/msc/gsm_04_08.h>
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#include <osmocom/msc/debug.h>
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#include <osmocom/msc/paging.h>
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#include <osmocom/msc/signal.h>
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#include <osmocom/msc/db.h>
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#include <osmocom/msc/chan_alloc.h>
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#include <osmocom/msc/vlr.h>
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#include <osmocom/msc/osmo_msc.h>
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#include <osmocom/msc/msc_ifaces.h>
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#include <osmocom/msc/a_iface.h>
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int subscr_paging_dispatch(unsigned int hooknum, unsigned int event,
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struct msgb *msg, void *data, void *param)
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{
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struct subscr_request *request, *tmp;
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struct gsm_subscriber_connection *conn = data;
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struct vlr_subscr *vsub = param;
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struct paging_signal_data sig_data;
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OSMO_ASSERT(vsub);
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OSMO_ASSERT(hooknum == GSM_HOOK_RR_PAGING);
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OSMO_ASSERT(!(conn && (conn->vsub != vsub)));
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OSMO_ASSERT(!((event == GSM_PAGING_SUCCEEDED) && !conn));
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LOGP(DPAG, LOGL_DEBUG, "Paging %s for %s (event=%d)\n",
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event == GSM_PAGING_SUCCEEDED ? "success" : "failure",
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vlr_subscr_name(vsub), event);
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if (!vsub->cs.is_paging) {
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LOGP(DPAG, LOGL_ERROR,
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"Paging Response received for subscriber"
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" that is not paging.\n");
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return -EINVAL;
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}
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if (event == GSM_PAGING_SUCCEEDED)
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msc_stop_paging(vsub);
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/* Inform parts of the system we don't know */
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sig_data.vsub = vsub;
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sig_data.conn = conn;
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sig_data.paging_result = event;
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osmo_signal_dispatch(SS_PAGING,
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event == GSM_PAGING_SUCCEEDED ?
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S_PAGING_SUCCEEDED : S_PAGING_EXPIRED,
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&sig_data);
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llist_for_each_entry_safe(request, tmp, &vsub->cs.requests, entry) {
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llist_del(&request->entry);
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if (request->cbfn) {
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LOGP(DPAG, LOGL_DEBUG, "Calling paging cbfn.\n");
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request->cbfn(hooknum, event, msg, data, request->param);
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} else
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LOGP(DPAG, LOGL_DEBUG, "Paging without action.\n");
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talloc_free(request);
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}
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/* balanced with the moment we start paging */
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vsub->cs.is_paging = false;
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vlr_subscr_put(vsub);
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return 0;
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}
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int msc_paging_request(struct vlr_subscr *vsub)
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{
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/* The subscriber was last seen in subscr->lac. Find out which
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* BSCs/RNCs are responsible and send them a paging request via open
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* SCCP connections (if any). */
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/* TODO Implementing only RNC paging, since this is code on the iu branch.
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* Need to add BSC paging at some point. */
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switch (vsub->cs.attached_via_ran) {
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case RAN_GERAN_A:
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return a_iface_tx_paging(vsub->imsi, vsub->tmsi, vsub->lac);
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case RAN_UTRAN_IU:
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return ranap_iu_page_cs(vsub->imsi,
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vsub->tmsi == GSM_RESERVED_TMSI?
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NULL : &vsub->tmsi,
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vsub->lac);
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default:
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break;
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}
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LOGP(DPAG, LOGL_ERROR, "%s: Cannot page, subscriber not attached\n",
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vlr_subscr_name(vsub));
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return -EINVAL;
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}
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/*! \brief Start a paging request for vsub, call cbfn(param) when done.
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* \param vsub subscriber to page.
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* \param cbfn function to call when the conn is established.
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* \param param caller defined param to pass to cbfn().
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* \param label human readable label of the request kind used for logging.
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*/
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struct subscr_request *subscr_request_conn(struct vlr_subscr *vsub,
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gsm_cbfn *cbfn, void *param,
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const char *label)
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{
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int rc;
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struct subscr_request *request;
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/* Start paging.. we know it is async so we can do it before */
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if (!vsub->cs.is_paging) {
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LOGP(DMM, LOGL_DEBUG, "Subscriber %s not paged yet, start paging.\n",
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vlr_subscr_name(vsub));
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rc = msc_paging_request(vsub);
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if (rc <= 0) {
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LOGP(DMM, LOGL_ERROR, "Subscriber %s paging failed: %d\n",
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vlr_subscr_name(vsub), rc);
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return NULL;
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}
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/* reduced on the first paging callback */
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vlr_subscr_get(vsub);
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vsub->cs.is_paging = true;
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} else {
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LOGP(DMM, LOGL_DEBUG, "Subscriber %s already paged.\n",
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vlr_subscr_name(vsub));
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}
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/* TODO: Stop paging in case of memory allocation failure */
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request = talloc_zero(vsub, struct subscr_request);
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if (!request)
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return NULL;
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request->cbfn = cbfn;
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request->param = param;
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llist_add_tail(&request->entry, &vsub->cs.requests);
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return request;
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}
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void subscr_remove_request(struct subscr_request *request)
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{
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llist_del(&request->entry);
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talloc_free(request);
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}
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struct gsm_subscriber_connection *connection_for_subscr(struct vlr_subscr *vsub)
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{
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struct gsm_network *net = vsub->vlr->user_ctx;
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struct gsm_subscriber_connection *conn;
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llist_for_each_entry(conn, &net->subscr_conns, entry) {
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if (conn->vsub == vsub)
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return conn;
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}
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return NULL;
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}
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