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/* The concept of a subscriber for the MSC, roughly HLR/VLR functionality */
/* (C) 2008 by Harald Welte <laforge@gnumonks.org>
* (C) 2009,2013 by Holger Hans Peter Freyther <zecke@selfish.org>
*
* All Rights Reserved
*
* 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 <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <time.h>
#include <stdbool.h>
#include <osmocom/core/talloc.h>
#include <osmocom/vty/vty.h>
#include <openbsc/gsm_subscriber.h>
#include <openbsc/gsm_04_08.h>
#include <openbsc/debug.h>
#include <openbsc/paging.h>
#include <openbsc/signal.h>
#include <openbsc/db.h>
#include <openbsc/chan_alloc.h>
#include <openbsc/vlr.h>
void *tall_sub_req_ctx;
int gsm48_secure_channel(struct gsm_subscriber_connection *conn, int key_seq,
gsm_cbfn *cb, void *cb_data);
/*
* Struct for pending channel requests. This is managed in the
* llist_head requests of each subscriber. The reference counting
* should work in such a way that a subscriber with a pending request
* remains in memory.
*/
struct subscr_request {
struct llist_head entry;
/* the callback data */
gsm_cbfn *cbfn;
void *param;
};
static struct bsc_subscr *vlr_subscr_to_bsc_sub(struct llist_head *bsc_subscribers,
struct vlr_subscr *vsub)
{
struct bsc_subscr *sub;
/* TODO MSC split -- creating a BSC subscriber directly from MSC data
* structures in RAM. At some point the MSC will send a message to the
* BSC instead. */
sub = bsc_subscr_find_or_create_by_imsi(bsc_subscribers, vsub->imsi);
sub->tmsi = vsub->tmsi;
sub->lac = vsub->lac;
return sub;
}
/*
* We got the channel assigned and can now hand this channel
* over to one of our callbacks.
*/
int subscr_paging_dispatch(unsigned int hooknum, unsigned int event,
struct msgb *msg, void *data, void *param)
{
struct subscr_request *request, *tmp;
struct gsm_subscriber_connection *conn = data;
struct vlr_subscr *vsub = param;
struct paging_signal_data sig_data;
struct bsc_subscr *bsub;
struct gsm_network *net;
OSMO_ASSERT(vsub && vsub->cs.is_paging);
net = vsub->vlr->user_ctx;
/*
* Stop paging on all other BTS. E.g. if this is
* the first timeout on a BTS then the others will
* timeout soon as well. Let's just stop everything
* and forget we wanted to page.
*/
bsub = vlr_subscr_to_bsc_sub(conn->network->bsc_subscribers, vsub);
paging_request_stop(&net->bts_list, NULL, bsub, NULL, NULL);
bsc_subscr_put(bsub);
/* Inform parts of the system we don't know */
sig_data.vsub = vsub;
sig_data.bts = conn ? conn->bts : NULL;
sig_data.conn = conn;
sig_data.paging_result = event;
osmo_signal_dispatch(
SS_PAGING,
event == GSM_PAGING_SUCCEEDED ?
S_PAGING_SUCCEEDED : S_PAGING_EXPIRED,
&sig_data
);
llist_for_each_entry_safe(request, tmp, &vsub->cs.requests, entry) {
llist_del(&request->entry);
request->cbfn(hooknum, event, msg, data, request->param);
talloc_free(request);
}
/* balanced with the moment we start paging */
vsub->cs.is_paging = false;
vlr_subscr_put(vsub);
return 0;
}
struct subscr_request *subscr_request_channel(struct vlr_subscr *vsub,
int channel_type,
gsm_cbfn *cbfn, void *param)
{
int rc;
struct subscr_request *request;
struct bsc_subscr *bsub;
struct gsm_network *net = vsub->vlr->user_ctx;
/* Start paging.. we know it is async so we can do it before */
if (!vsub->cs.is_paging) {
LOGP(DMM, LOGL_DEBUG, "Subscriber %s not paged yet.\n",
vlr_subscr_name(vsub));
bsub = vlr_subscr_to_bsc_sub(net->bsc_subscribers, vsub);
rc = paging_request(net, bsub, channel_type, NULL, NULL);
bsc_subscr_put(bsub);
if (rc <= 0) {
LOGP(DMM, LOGL_ERROR, "Subscriber %s paging failed: %d\n",
vlr_subscr_name(vsub), rc);
return NULL;
}
/* reduced on the first paging callback */
vlr_subscr_get(vsub);
vsub->cs.is_paging = true;
}
/* TODO: Stop paging in case of memory allocation failure */
request = talloc_zero(vsub, struct subscr_request);
if (!request)
return NULL;
request->cbfn = cbfn;
request->param = param;
llist_add_tail(&request->entry, &vsub->cs.requests);
return request;
}
void subscr_remove_request(struct subscr_request *request)
{
llist_del(&request->entry);
talloc_free(request);
}
struct gsm_subscriber_connection *connection_for_subscr(struct vlr_subscr *vsub)
{
struct gsm_network *net = vsub->vlr->user_ctx;
struct gsm_subscriber_connection *conn;
llist_for_each_entry(conn, &net->subscr_conns, entry) {
if (conn->vsub == vsub)
return conn;
}
return NULL;
}
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