[subscr] Split gsm_subscriber.c in BSC and MSC part
For the BSC part we still assign a gsm_subscriber to lchan but it
might only contain the TMSI of this subscriber.
For the MSC part we will need the HLR/VLR feature of the gsm_subscriber,
specially the lookup's by number...
So if libbsc.a/libmsc.a are compiled in one app and used the
subscribers will be shared, and if only libbsc.a gets used we will
have more empty gsm_subscriber.c..
diff --git a/openbsc/src/gsm_subscriber_base.c b/openbsc/src/gsm_subscriber_base.c
new file mode 100644
index 0000000..83addd0
--- /dev/null
+++ b/openbsc/src/gsm_subscriber_base.c
@@ -0,0 +1,209 @@
+/* The concept of a subscriber as seen by the BSC */
+
+/* (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>
+
+LLIST_HEAD(active_subscribers);
+void *tall_subscr_ctx;
+void *tall_sub_req_ctx;
+
+/* for the gsm_subscriber.c */
+struct llist_head *subscr_bsc_active_subscriber(void)
+{
+ return &active_subscribers;
+}
+
+/*
+ * 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(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);
+}
+