initial working osmo-smlc implementation
The lower level Lb/SCCP interface conn handling is essentially a copy of
OsmoMSC's A/SCCP infrastructure (OsmoMSC also connects to multiple BSCs).
The smlc_subscr is mostly a copy of OsmoBSC's bsc_subscr.
smlc_loc_req FSM is the SMLC side of OsmoBSC's new lcs_loc_req FSM.
cell_locations configures geographic coordinates of individual cells.
Change-Id: I917ba8fc51a1f1150be77ae01e12a7b16a853052
diff --git a/src/osmo-smlc/smlc_subscr.c b/src/osmo-smlc/smlc_subscr.c
new file mode 100644
index 0000000..bfbb1e9
--- /dev/null
+++ b/src/osmo-smlc/smlc_subscr.c
@@ -0,0 +1,125 @@
+/* GSM subscriber details for use in SMLC */
+/*
+ * (C) 2020 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ *
+ * Author: Neels Hofmeyr <neels@hofmeyr.de>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <osmocom/smlc/debug.h>
+#include <osmocom/smlc/smlc_data.h>
+#include <osmocom/smlc/smlc_subscr.h>
+
+static void smlc_subscr_free(struct smlc_subscr *smlc_subscr)
+{
+ llist_del(&smlc_subscr->entry);
+ talloc_free(smlc_subscr);
+}
+
+static int smlc_subscr_use_cb(struct osmo_use_count_entry *e, int32_t old_use_count, const char *file, int line)
+{
+ struct smlc_subscr *smlc_subscr = e->use_count->talloc_object;
+ int32_t total;
+ int level;
+
+ if (!e->use)
+ return -EINVAL;
+
+ total = osmo_use_count_total(&smlc_subscr->use_count);
+
+ if (total == 0
+ || (total == 1 && old_use_count == 0 && e->count == 1))
+ level = LOGL_INFO;
+ else
+ level = LOGL_DEBUG;
+
+ LOGPSRC(DREF, level, file, line, "%s: %s %s\n",
+ smlc_subscr_to_str_c(OTC_SELECT, smlc_subscr),
+ (e->count - old_use_count) > 0? "+" : "-", e->use);
+
+ if (e->count < 0)
+ return -ERANGE;
+
+ if (total == 0)
+ smlc_subscr_free(smlc_subscr);
+ return 0;
+}
+
+static struct smlc_subscr *smlc_subscr_alloc()
+{
+ struct smlc_subscr *smlc_subscr;
+
+ smlc_subscr = talloc_zero(g_smlc, struct smlc_subscr);
+ if (!smlc_subscr)
+ return NULL;
+
+ smlc_subscr->use_count = (struct osmo_use_count){
+ .talloc_object = smlc_subscr,
+ .use_cb = smlc_subscr_use_cb,
+ };
+
+ llist_add_tail(&smlc_subscr->entry, &g_smlc->subscribers);
+
+ return smlc_subscr;
+}
+
+struct smlc_subscr *smlc_subscr_find(const struct osmo_mobile_identity *imsi, const char *use_token)
+{
+ struct smlc_subscr *smlc_subscr;
+ if (!imsi)
+ return NULL;
+
+ llist_for_each_entry(smlc_subscr, &g_smlc->subscribers, entry) {
+ if (!osmo_mobile_identity_cmp(&smlc_subscr->imsi, imsi)) {
+ smlc_subscr_get(smlc_subscr, use_token);
+ return smlc_subscr;
+ }
+ }
+ return NULL;
+}
+
+struct smlc_subscr *smlc_subscr_find_or_create(const struct osmo_mobile_identity *imsi, const char *use_token)
+{
+ struct smlc_subscr *smlc_subscr;
+ if (!imsi)
+ return NULL;
+ smlc_subscr = smlc_subscr_find(imsi, use_token);
+ if (smlc_subscr)
+ return smlc_subscr;
+ smlc_subscr = smlc_subscr_alloc();
+ if (!smlc_subscr)
+ return NULL;
+ smlc_subscr->imsi = *imsi;
+ smlc_subscr_get(smlc_subscr, use_token);
+ return smlc_subscr;
+}
+
+int smlc_subscr_to_str_buf(char *buf, size_t buf_len, const struct smlc_subscr *smlc_subscr)
+{
+ struct osmo_strbuf sb = { .buf = buf, .len = buf_len };
+ OSMO_STRBUF_APPEND(sb, osmo_mobile_identity_to_str_buf, &smlc_subscr->imsi);
+ OSMO_STRBUF_PRINTF(sb, "[");
+ OSMO_STRBUF_APPEND(sb, osmo_use_count_to_str_buf, &smlc_subscr->use_count);
+ OSMO_STRBUF_PRINTF(sb, "]");
+ return sb.chars_needed;
+}
+
+char *smlc_subscr_to_str_c(void *ctx, const struct smlc_subscr *smlc_subscr)
+{
+ OSMO_NAME_C_IMPL(ctx, 64, "ERROR", smlc_subscr_to_str_buf, smlc_subscr)
+}