154 lines
4.4 KiB
C
154 lines
4.4 KiB
C
/* Paging helper and manager.... */
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/* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
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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 General Public License as published by
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* the Free Software Foundation; either version 2 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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/*
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* Relevant specs:
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* 12.21:
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* - 9.4.12 for CCCH Local Threshold
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*
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* 05.58:
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* - 8.5.2 CCCH Load indication
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* - 9.3.15 Paging Load
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*
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* Approach:
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* - Send paging command to subscriber
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* - On Channel Request we will remember the reason
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* - After the ACK we will request the identity
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* - Then we will send assign the gsm_subscriber and
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* - and call a callback
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <openbsc/paging.h>
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#include <openbsc/debug.h>
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#include <openbsc/abis_rsl.h>
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#include <openbsc/gsm_04_08.h>
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#define PAGING_TIMEOUT 1, 0
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static LLIST_HEAD(managed_bts);
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/*
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* Kill one paging request update the internal list...
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*/
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static void page_remove_request(struct paging_bts *paging_bts) {
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struct paging_request *to_be_deleted = paging_bts->last_request;
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paging_bts->last_request =
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(struct paging_request *)paging_bts->last_request->entry.next;
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if (&to_be_deleted->entry == &paging_bts->pending_requests)
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paging_bts->last_request = NULL;
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llist_del(&to_be_deleted->entry);
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free(to_be_deleted);
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}
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static void page_handle_pending_requests(void *data) {
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u_int8_t mi[128];
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unsigned long int tmsi;
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unsigned int mi_len;
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struct paging_bts *paging_bts = (struct paging_bts *)data;
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if (!paging_bts->last_request)
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paging_bts->last_request =
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(struct paging_request *)paging_bts->pending_requests.next;
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if (&paging_bts->last_request->entry == &paging_bts->pending_requests) {
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paging_bts->last_request = NULL;
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return;
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}
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/* handle the paging request now */
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DEBUGP(DPAG, "Going to send paging commands: '%s'\n",
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paging_bts->last_request->subscr->imsi);
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++paging_bts->last_request->requests;
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tmsi = strtoul(paging_bts->last_request->subscr->tmsi, NULL, 10);
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mi_len = generate_mid_from_tmsi(mi, tmsi);
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rsl_paging_cmd(paging_bts->bts, 1, mi_len, mi, RSL_CHANNEED_TCH_F);
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if (paging_bts->last_request->requests > 1500) {
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page_remove_request(paging_bts);
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} else {
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/* move to the next item */
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paging_bts->last_request =
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(struct paging_request *)paging_bts->last_request->entry.next;
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if (&paging_bts->last_request->entry == &paging_bts->pending_requests)
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paging_bts->last_request = NULL;
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}
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schedule_timer(&paging_bts->page_timer, PAGING_TIMEOUT);
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}
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static int page_pending_request(struct paging_bts *bts,
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struct gsm_subscriber *subscr) {
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struct paging_request *req;
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llist_for_each_entry(req, &bts->pending_requests, entry) {
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if (subscr == req->subscr)
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return 1;
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}
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return 0;
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}
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struct paging_bts* page_allocate(struct gsm_bts *bts) {
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struct paging_bts *page;
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page = (struct paging_bts *)malloc(sizeof(*page));
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memset(page, 0, sizeof(*page));
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page->bts = bts;
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INIT_LLIST_HEAD(&page->pending_requests);
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page->page_timer.cb = page_handle_pending_requests;
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page->page_timer.data = page;
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llist_add_tail(&page->bts_list, &managed_bts);
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return page;
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}
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void page_request(struct gsm_bts *bts, struct gsm_subscriber *subscr, int type) {
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struct paging_bts *bts_entry;
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struct paging_request *req;
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req = (struct paging_request *)malloc(sizeof(*req));
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memset(req, 0, sizeof(*req));
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req->subscr = subscr_get(subscr);
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req->bts = bts;
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req->chan_type = type;
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llist_for_each_entry(bts_entry, &managed_bts, bts_list) {
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if (bts == bts_entry->bts) {
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if (!page_pending_request(bts_entry, subscr)) {
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llist_add_tail(&req->entry, &bts_entry->pending_requests);
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if (!timer_pending(&bts_entry->page_timer))
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schedule_timer(&bts_entry->page_timer, PAGING_TIMEOUT);
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} else {
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DEBUGP(DPAG, "Paging request already pending\n");
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}
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return;
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}
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}
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DEBUGP(DPAG, "Paging request for not managed BTS\n");
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free(req);
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return;
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}
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