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/* Paging helper and manager.... */
/* (C) 2009 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 General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
/*
* Relevant specs:
* 12.21:
* - 9.4.12 for CCCH Local Threshold
*
* 05.58:
* - 8.5.2 CCCH Load indication
* - 9.3.15 Paging Load
*
* Approach:
* - Send paging command to subscriber
* - On Channel Request we will remember the reason
* - After the ACK we will request the identity
* - Then we will send assign the gsm_subscriber and
* - and call a callback
*/
#include <stdio.h>
#include <stdlib.h>
#include <openbsc/paging.h>
#include <openbsc/debug.h>
#include <openbsc/abis_rsl.h>
#include <openbsc/gsm_04_08.h>
#define PAGING_TIMEOUT 0, 5000
static LLIST_HEAD(managed_bts);
/*
* Kill one paging request update the internal list...
*/
static void page_remove_request(struct paging_bts *paging_bts) {
struct paging_request *to_be_deleted = paging_bts->last_request;
paging_bts->last_request =
(struct paging_request *)paging_bts->last_request->entry.next;
if (&to_be_deleted->entry == &paging_bts->pending_requests)
paging_bts->last_request = NULL;
llist_del(&to_be_deleted->entry);
free(to_be_deleted);
}
static void page_handle_pending_requests(void *data) {
u_int8_t mi[128];
unsigned long int tmsi;
unsigned int mi_len;
struct paging_bts *paging_bts = (struct paging_bts *)data;
if (!paging_bts->last_request)
paging_bts->last_request =
(struct paging_request *)paging_bts->pending_requests.next;
if (&paging_bts->last_request->entry == &paging_bts->pending_requests) {
paging_bts->last_request = NULL;
return;
}
/* handle the paging request now */
DEBUGP(DPAG, "Going to send paging commands: '%s'\n",
paging_bts->last_request->subscr->imsi);
tmsi = strtoul(paging_bts->last_request->subscr->tmsi, NULL, 10);
mi_len = generate_mid_from_tmsi(mi, tmsi);
rsl_paging_cmd(paging_bts->bts, 1, mi_len, mi, RSL_CHANNEED_TCH_F);
/* move to the next item */
paging_bts->last_request =
(struct paging_request *)paging_bts->last_request->entry.next;
if (&paging_bts->last_request->entry == &paging_bts->pending_requests)
paging_bts->last_request = NULL;
schedule_timer(&paging_bts->page_timer, PAGING_TIMEOUT);
}
static int page_pending_request(struct paging_bts *bts,
struct gsm_subscriber *subscr) {
struct paging_request *req;
llist_for_each_entry(req, &bts->pending_requests, entry) {
if (subscr == req->subscr)
return 1;
}
return 0;
}
struct paging_bts* page_allocate(struct gsm_bts *bts) {
struct paging_bts *page;
page = (struct paging_bts *)malloc(sizeof(*page));
memset(page, 0, sizeof(*page));
page->bts = bts;
INIT_LLIST_HEAD(&page->pending_requests);
page->page_timer.cb = page_handle_pending_requests;
page->page_timer.data = page;
llist_add_tail(&page->bts_list, &managed_bts);
return page;
}
void page_request(struct gsm_bts *bts, struct gsm_subscriber *subscr, int type) {
struct paging_bts *bts_entry;
struct paging_request *req;
req = (struct paging_request *)malloc(sizeof(*req));
req->subscr = subscr_get(subscr);
req->bts = bts;
req->chan_type = type;
llist_for_each_entry(bts_entry, &managed_bts, bts_list) {
if (bts == bts_entry->bts && !page_pending_request(bts_entry, subscr)) {
llist_add_tail(&req->entry, &bts_entry->pending_requests);
if (!timer_pending(&bts_entry->page_timer))
schedule_timer(&bts_entry->page_timer, PAGING_TIMEOUT);
return;
}
}
DEBUGP(DPAG, "Paging request for not managed BTS\n");
free(req);
return;
}
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