osmith submitted this change.
Store MSC
Expect one MSC to be configured in the address book (part of the cs7
section in the config, see doc/examples/osmo-bsc-nat/osmo-bsc-nat.cfg)
and store it on start up.
Store the MSC in a list, as we may potentially support multiple MSCs in
the future. Also that makes it symmetric to the BSC list.
Don't use the stored MSCs in the forwarding logic just yet, a future
commit will replace the current forwarding code with proper connection
mappings.
Related: SYS#5560
Change-Id: I711df0c649728f1007857fbfda500ed5ef69287b
---
M include/osmocom/bsc_nat/Makefile.am
M include/osmocom/bsc_nat/bsc_nat.h
A include/osmocom/bsc_nat/msc.h
M src/osmo-bsc-nat/Makefile.am
M src/osmo-bsc-nat/bsc_nat.c
M src/osmo-bsc-nat/bsc_nat_fsm.c
M src/osmo-bsc-nat/main.c
A src/osmo-bsc-nat/msc.c
8 files changed, 120 insertions(+), 16 deletions(-)
diff --git a/include/osmocom/bsc_nat/Makefile.am b/include/osmocom/bsc_nat/Makefile.am
index 398b0aa..1c675f7 100644
--- a/include/osmocom/bsc_nat/Makefile.am
+++ b/include/osmocom/bsc_nat/Makefile.am
@@ -4,5 +4,6 @@
bsc_nat_fsm.h \
bssap.h \
logging.h \
+ msc.h \
vty.h \
$(NULL)
diff --git a/include/osmocom/bsc_nat/bsc_nat.h b/include/osmocom/bsc_nat/bsc_nat.h
index aac06ab..9e58a79 100644
--- a/include/osmocom/bsc_nat/bsc_nat.h
+++ b/include/osmocom/bsc_nat/bsc_nat.h
@@ -40,6 +40,7 @@
struct {
struct bsc_nat_sccp_inst *sccp_inst;
+ struct llist_head mscs; /* list of struct msc */
} cn;
struct {
diff --git a/include/osmocom/bsc_nat/msc.h b/include/osmocom/bsc_nat/msc.h
new file mode 100644
index 0000000..1f91de0
--- /dev/null
+++ b/include/osmocom/bsc_nat/msc.h
@@ -0,0 +1,34 @@
+/* (C) 2021 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+ * Author: Oliver Smith <osmith@sysmocom.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/lienses/>.
+ *
+ */
+
+#pragma once
+
+#include <osmocom/sigtran/sccp_sap.h>
+
+struct msc {
+ struct llist_head list;
+ struct osmo_sccp_addr addr;
+};
+
+struct msc *msc_alloc(struct osmo_sccp_addr *addr);
+int msc_alloc_from_addr_book(void);
+
+struct msc *msc_get(void);
+
+void msc_free(struct msc *msc);
diff --git a/src/osmo-bsc-nat/Makefile.am b/src/osmo-bsc-nat/Makefile.am
index bb8e990..1dd82fd 100644
--- a/src/osmo-bsc-nat/Makefile.am
+++ b/src/osmo-bsc-nat/Makefile.am
@@ -31,6 +31,7 @@
bssap.c \
logging.c \
main.c \
+ msc.c \
vty.c \
$(NULL)
diff --git a/src/osmo-bsc-nat/bsc_nat.c b/src/osmo-bsc-nat/bsc_nat.c
index 8baa096..23d7498 100644
--- a/src/osmo-bsc-nat/bsc_nat.c
+++ b/src/osmo-bsc-nat/bsc_nat.c
@@ -24,6 +24,7 @@
#include <osmocom/bsc_nat/bsc_nat.h>
#include <osmocom/bsc_nat/bsc_nat_fsm.h>
#include <osmocom/bsc_nat/logging.h>
+#include <osmocom/bsc_nat/msc.h>
struct bsc_nat *bsc_nat_alloc(void *tall_ctx)
{
@@ -40,6 +41,7 @@
OSMO_ASSERT(bsc_nat->ran.sccp_inst);
talloc_set_name_const(bsc_nat->ran.sccp_inst, "struct bsc_nat_sccp_inst (RAN)");
+ INIT_LLIST_HEAD(&bsc_nat->cn.mscs);
INIT_LLIST_HEAD(&bsc_nat->ran.bscs);
bsc_nat_fsm_alloc(bsc_nat);
@@ -49,6 +51,7 @@
void bsc_nat_free(struct bsc_nat *bsc_nat)
{
+ struct msc *msc, *m;
struct bsc *bsc, *b;
if (bsc_nat->fi) {
@@ -56,6 +59,10 @@
bsc_nat->fi = NULL;
}
+ llist_for_each_entry_safe(msc, m, &bsc_nat->cn.mscs, list) {
+ msc_free(msc);
+ }
+
llist_for_each_entry_safe(bsc, b, &bsc_nat->ran.bscs, list) {
bsc_free(bsc);
}
diff --git a/src/osmo-bsc-nat/bsc_nat_fsm.c b/src/osmo-bsc-nat/bsc_nat_fsm.c
index 07b9eb5..4193ae9 100644
--- a/src/osmo-bsc-nat/bsc_nat_fsm.c
+++ b/src/osmo-bsc-nat/bsc_nat_fsm.c
@@ -186,22 +186,7 @@
case OSMO_PRIM(OSMO_SCU_PRIM_N_UNITDATA, PRIM_OP_INDICATION):
/* connection-less data received */
- addr = &prim->u.unitdata.calling_addr;
-
- if (sccp_sap_get_peer_addr_out(sccp_inst, addr, &peer_addr_out) < 0)
- goto error;
-
- LOGP(DMAIN, LOGL_DEBUG, "Fwd to %s\n", bsc_nat_print_addr_ran(&peer_addr_out));
-
- /* oph->msg stores oph and unitdata msg. Move oph->msg->data to
- * unitdata msg and send it again. */
- msgb_pull_to_l2(oph->msg);
- osmo_sccp_tx_unitdata(g_bsc_nat->ran.sccp_inst->scu,
- &g_bsc_nat->ran.sccp_inst->addr,
- &peer_addr_out,
- oph->msg->data,
- msgb_length(oph->msg));
- rc = 0;
+ rc = bssap_handle_udt(sccp_inst, &prim->u.unitdata.calling_addr, oph->msg, msgb_l2len(oph->msg));
break;
default:
diff --git a/src/osmo-bsc-nat/main.c b/src/osmo-bsc-nat/main.c
index c0b65ea..6cb1e0f 100644
--- a/src/osmo-bsc-nat/main.c
+++ b/src/osmo-bsc-nat/main.c
@@ -30,6 +30,7 @@
#include <osmocom/bsc_nat/bsc_nat.h>
#include <osmocom/bsc_nat/bsc_nat_fsm.h>
#include <osmocom/bsc_nat/logging.h>
+#include <osmocom/bsc_nat/msc.h>
#include <osmocom/bsc_nat/vty.h>
static const char *const copyright =
@@ -199,6 +200,9 @@
bsc_nat_fsm_start(g_bsc_nat);
+ if (msc_alloc_from_addr_book() < 0)
+ exit(1);
+
while (!osmo_select_shutdown_done())
osmo_select_main_ctx(0);
diff --git a/src/osmo-bsc-nat/msc.c b/src/osmo-bsc-nat/msc.c
new file mode 100644
index 0000000..70f9d76
--- /dev/null
+++ b/src/osmo-bsc-nat/msc.c
@@ -0,0 +1,71 @@
+/* (C) 2021 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+ * Author: Oliver Smith <osmith@sysmocom.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/lienses/>.
+ *
+ */
+
+#include "config.h"
+#include <errno.h>
+#include <osmocom/bsc_nat/msc.h>
+#include <osmocom/bsc_nat/bsc_nat.h>
+#include <osmocom/bsc_nat/logging.h>
+
+struct msc *msc_alloc(struct osmo_sccp_addr *addr)
+{
+ struct msc *msc = talloc_zero(g_bsc_nat, struct msc);
+
+ OSMO_ASSERT(msc);
+ talloc_set_name(msc, "MSC(PC=%s)", osmo_ss7_pointcode_print(NULL, addr->pc));
+
+ LOGP(DMAIN, LOGL_DEBUG, "Add %s\n", talloc_get_name(msc));
+
+ msc->addr = *addr;
+
+ INIT_LLIST_HEAD(&msc->list);
+ llist_add(&msc->list, &g_bsc_nat->cn.mscs);
+
+ return msc;
+}
+
+int msc_alloc_from_addr_book(void)
+{
+ struct osmo_sccp_addr addr;
+
+ /* For now only one MSC is supported */
+ if (osmo_sccp_addr_by_name_local(&addr, "msc", g_bsc_nat->cn.sccp_inst->ss7_inst) < 0) {
+ LOGP(DMAIN, LOGL_ERROR, "Configuration error, MSC not found in address book\n");
+ return -ENOENT;
+ }
+
+ msc_alloc(&addr);
+ return 0;
+}
+
+struct msc *msc_get(void)
+{
+ /* For now only one MSC is supported */
+
+ OSMO_ASSERT(!llist_empty(&g_bsc_nat->cn.mscs));
+
+ return llist_first_entry(&g_bsc_nat->cn.mscs, struct msc, list);
+}
+
+void msc_free(struct msc *msc)
+{
+ LOGP(DMAIN, LOGL_DEBUG, "Del %s\n", talloc_get_name(msc));
+ llist_del(&msc->list);
+ talloc_free(msc);
+}
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