| /* Dummy implementation of a subscriber database, roghly HLR/VLR functionality */ |
| |
| /* (C) 2008 by Harald Welte <laforge@gnumonks.org> |
| * (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. |
| * |
| */ |
| |
| #include <unistd.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <assert.h> |
| |
| #include <openbsc/talloc.h> |
| #include <openbsc/gsm_subscriber.h> |
| #include <openbsc/paging.h> |
| #include <openbsc/debug.h> |
| #include <openbsc/paging.h> |
| #include <openbsc/signal.h> |
| #include <openbsc/db.h> |
| |
| LLIST_HEAD(active_subscribers); |
| static void *tall_subscr_ctx; |
| static void *tall_sub_req_ctx; |
| |
| /* |
| * 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; |
| |
| /* back reference */ |
| struct gsm_subscriber *subscr; |
| |
| /* the requested channel type */ |
| int channel_type; |
| |
| /* the bts we have decided to use */ |
| struct gsm_network *network; |
| |
| /* the callback data */ |
| gsm_cbfn *cbfn; |
| void *param; |
| }; |
| |
| /* |
| * We got the channel assigned and can now hand this channel |
| * over to one of our callbacks. |
| */ |
| static int subscr_paging_cb(unsigned int hooknum, unsigned int event, |
| struct msgb *msg, void *data, void *param) |
| { |
| struct subscr_request *request; |
| struct gsm_subscriber *subscr = (struct gsm_subscriber *)param; |
| |
| assert(!llist_empty(&subscr->requests)); |
| |
| /* |
| * FIXME: What to do with paging requests coming during |
| * this callback? We must be sure to not start paging when |
| * we have an active connection to a subscriber and to make |
| * the subscr_put_channel work as required... |
| */ |
| request = (struct subscr_request *)subscr->requests.next; |
| llist_del(&request->entry); |
| subscr->in_callback = 1; |
| request->cbfn(hooknum, event, msg, data, request->param); |
| subscr->in_callback = 0; |
| |
| talloc_free(request); |
| return 0; |
| } |
| |
| static void subscr_send_paging_request(struct gsm_subscriber *subscr) |
| { |
| struct subscr_request *request; |
| assert(!llist_empty(&subscr->requests)); |
| |
| request = (struct subscr_request *)subscr->requests.next; |
| paging_request(request->network, subscr, request->channel_type, |
| subscr_paging_cb, subscr); |
| } |
| |
| struct gsm_subscriber *subscr_alloc(void) |
| { |
| struct gsm_subscriber *s; |
| |
| s = talloc(tall_subscr_ctx, struct gsm_subscriber); |
| if (!s) |
| return NULL; |
| |
| memset(s, 0, sizeof(*s)); |
| llist_add_tail(&s->entry, &active_subscribers); |
| s->use_count = 1; |
| |
| INIT_LLIST_HEAD(&s->requests); |
| |
| return s; |
| } |
| |
| static void subscr_free(struct gsm_subscriber *subscr) |
| { |
| llist_del(&subscr->entry); |
| talloc_free(subscr); |
| } |
| |
| struct gsm_subscriber *subscr_get_by_tmsi(struct gsm_network *net, |
| const char *tmsi) |
| { |
| struct gsm_subscriber *subscr; |
| |
| /* we might have a record in memory already */ |
| llist_for_each_entry(subscr, &active_subscribers, entry) { |
| if (strcmp(subscr->tmsi, tmsi) == 0) |
| return subscr_get(subscr); |
| } |
| |
| return db_get_subscriber(net, GSM_SUBSCRIBER_TMSI, tmsi); |
| } |
| |
| struct gsm_subscriber *subscr_get_by_imsi(struct gsm_network *net, |
| const char *imsi) |
| { |
| struct gsm_subscriber *subscr; |
| |
| llist_for_each_entry(subscr, &active_subscribers, entry) { |
| if (strcmp(subscr->imsi, imsi) == 0) |
| return subscr_get(subscr); |
| } |
| |
| return db_get_subscriber(net, GSM_SUBSCRIBER_IMSI, imsi); |
| } |
| |
| struct gsm_subscriber *subscr_get_by_extension(struct gsm_network *net, |
| const char *ext) |
| { |
| struct gsm_subscriber *subscr; |
| |
| llist_for_each_entry(subscr, &active_subscribers, entry) { |
| if (strcmp(subscr->extension, ext) == 0) |
| return subscr_get(subscr); |
| } |
| |
| return db_get_subscriber(net, GSM_SUBSCRIBER_EXTENSION, ext); |
| } |
| |
| struct gsm_subscriber *subscr_get_by_id(struct gsm_network *net, |
| unsigned long long id) |
| { |
| struct gsm_subscriber *subscr; |
| char buf[32]; |
| sprintf(buf, "%llu", id); |
| |
| llist_for_each_entry(subscr, &active_subscribers, entry) { |
| if (subscr->id == id) |
| return subscr_get(subscr); |
| } |
| |
| return db_get_subscriber(net, GSM_SUBSCRIBER_ID, buf); |
| } |
| |
| |
| int subscr_update(struct gsm_subscriber *s, struct gsm_bts *bts, int reason) |
| { |
| /* FIXME: Migrate pending requests from one BSC to another */ |
| switch (reason) { |
| case GSM_SUBSCRIBER_UPDATE_ATTACHED: |
| s->net = bts->network; |
| /* Indicate "attached to LAC" */ |
| s->lac = bts->location_area_code; |
| dispatch_signal(SS_SUBSCR, S_SUBSCR_ATTACHED, s); |
| break; |
| case GSM_SUBSCRIBER_UPDATE_DETACHED: |
| /* Only detach if we are currently in this area */ |
| if (bts->location_area_code == s->lac) |
| s->lac = 0; |
| dispatch_signal(SS_SUBSCR, S_SUBSCR_DETACHED, s); |
| break; |
| default: |
| fprintf(stderr, "subscr_update with unknown reason: %d\n", |
| reason); |
| break; |
| }; |
| return db_sync_subscriber(s); |
| } |
| |
| struct gsm_subscriber *subscr_get(struct gsm_subscriber *subscr) |
| { |
| subscr->use_count++; |
| DEBUGP(DCC, "subscr %s usage increases usage to: %d\n", |
| subscr->extension, subscr->use_count); |
| return subscr; |
| } |
| |
| struct gsm_subscriber *subscr_put(struct gsm_subscriber *subscr) |
| { |
| subscr->use_count--; |
| DEBUGP(DCC, "subscr %s usage decreased usage to: %d\n", |
| subscr->extension, subscr->use_count); |
| if (subscr->use_count <= 0) |
| subscr_free(subscr); |
| return NULL; |
| } |
| |
| void subscr_get_channel(struct gsm_subscriber *subscr, |
| struct gsm_network *network, int type, |
| gsm_cbfn *cbfn, void *param) |
| { |
| struct subscr_request *request; |
| |
| request = talloc(tall_sub_req_ctx, struct subscr_request); |
| if (!request) { |
| if (cbfn) |
| cbfn(GSM_HOOK_RR_PAGING, GSM_PAGING_OOM, |
| NULL, NULL, param); |
| return; |
| } |
| |
| memset(request, 0, sizeof(*request)); |
| request->network = network; |
| request->subscr = subscr; |
| request->channel_type = type; |
| request->cbfn = cbfn; |
| request->param = param; |
| |
| /* |
| * FIXME: We might be able to assign more than one |
| * channel, e.g. voice and SMS submit at the same |
| * time. |
| */ |
| if (!subscr->in_callback && llist_empty(&subscr->requests)) { |
| /* add to the list, send a request */ |
| llist_add_tail(&request->entry, &subscr->requests); |
| subscr_send_paging_request(subscr); |
| } else { |
| /* this will be picked up later, from subscr_put_channel */ |
| llist_add_tail(&request->entry, &subscr->requests); |
| } |
| } |
| |
| void subscr_put_channel(struct gsm_lchan *lchan) |
| { |
| /* |
| * FIXME: Continue with other requests now... by checking |
| * the gsm_subscriber inside the gsm_lchan. Drop the ref count |
| * of the lchan after having asked the next requestee to handle |
| * the channel. |
| */ |
| /* |
| * FIXME: is the lchan is of a different type we could still |
| * issue an immediate assignment for another channel and then |
| * close this one. |
| */ |
| /* |
| * Currently we will drop the last ref of the lchan which |
| * will result in a channel release on RSL and we will start |
| * the paging. This should work most of the time as the MS |
| * will listen to the paging requests before we timeout |
| */ |
| |
| put_lchan(lchan); |
| |
| if (lchan->subscr && !llist_empty(&lchan->subscr->requests)) |
| subscr_send_paging_request(lchan->subscr); |
| } |
| |
| |
| static __attribute__((constructor)) void on_dso_load_subscr(void) |
| { |
| tall_subscr_ctx = talloc_named_const(tall_bsc_ctx, 1, "subscriber"); |
| |
| tall_sub_req_ctx = talloc_named_const(tall_bsc_ctx, 1, |
| "subscr_request"); |
| } |