| /* 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); |
| ++paging_bts->last_request->requests; |
| 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); |
| |
| if (paging_bts->last_request->requests > 1500) { |
| page_remove_request(paging_bts); |
| } else { |
| /* 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)); |
| memset(req, 0, 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) { |
| if (!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); |
| } else { |
| DEBUGP(DPAG, "Paging request already pending\n"); |
| } |
| |
| return; |
| } |
| } |
| |
| DEBUGP(DPAG, "Paging request for not managed BTS\n"); |
| free(req); |
| return; |
| } |