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authorPhilipp Maier <pmaier@sysmocom.de>2017-04-12 15:19:45 +0200
committerNeels Hofmeyr <nhofmeyr@sysmocom.de>2017-06-18 17:50:08 +0200
commit76174d9dd94bb88ae63e616e84ae58b9f290e92b (patch)
tree90898e2087f5485041f2da74edcb3ea5596f2123
parente3aca93630e7a4572bd0459115b25348e1840c0e (diff)
WIP: Integrate AoIP into MSC
-rw-r--r--openbsc/include/openbsc/Makefile.am2
-rw-r--r--openbsc/include/openbsc/a_iface.h25
-rw-r--r--openbsc/include/openbsc/a_iface_bssap.h47
-rw-r--r--openbsc/include/openbsc/gsm_data.h5
-rw-r--r--openbsc/include/openbsc/iu.h2
-rw-r--r--openbsc/include/openbsc/msc_ifaces.h19
-rw-r--r--openbsc/include/openbsc/osmo_msc.h7
-rw-r--r--openbsc/src/libmsc/Makefile.am2
-rw-r--r--openbsc/src/libmsc/a_iface.c218
-rw-r--r--openbsc/src/libmsc/a_iface_bssap.c647
-rw-r--r--openbsc/src/libmsc/msc_ifaces.c5
-rw-r--r--openbsc/src/libmsc/osmo_msc.c20
-rw-r--r--openbsc/src/osmo-msc/msc_main.c7
-rw-r--r--openbsc/tests/libiudummy/iudummy.c6
-rw-r--r--openbsc/tests/msc_vlr/Makefile.am2
-rw-r--r--openbsc/tests/sms_queue/Makefile.am4
16 files changed, 972 insertions, 46 deletions
diff --git a/openbsc/include/openbsc/Makefile.am b/openbsc/include/openbsc/Makefile.am
index 1c31f74..be75958 100644
--- a/openbsc/include/openbsc/Makefile.am
+++ b/openbsc/include/openbsc/Makefile.am
@@ -2,6 +2,8 @@ noinst_HEADERS = \
abis_nm.h \
abis_om2000.h \
abis_rsl.h \
+ a_iface.h \
+ a_iface_bssap.h \
arfcn_range_encode.h \
auth.h \
bsc_msc.h \
diff --git a/openbsc/include/openbsc/a_iface.h b/openbsc/include/openbsc/a_iface.h
new file mode 100644
index 0000000..d5c5f9e
--- /dev/null
+++ b/openbsc/include/openbsc/a_iface.h
@@ -0,0 +1,25 @@
+/* (C) 2017 by Sysmocom s.f.m.c. GmbH
+ * All Rights Reserved
+ *
+ * Author: Philipp Maier
+ *
+ * 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/>.
+ *
+ */
+
+/* Initalize A interface connection between to MSC and BSC */
+int a_init(void *ctx, const char *name, uint32_t local_pc, const char *listen_addr,
+ const char *remote_addr, uint16_t local_port, struct gsm_network *network);
+
+#pragma once
diff --git a/openbsc/include/openbsc/a_iface_bssap.h b/openbsc/include/openbsc/a_iface_bssap.h
new file mode 100644
index 0000000..41f7213
--- /dev/null
+++ b/openbsc/include/openbsc/a_iface_bssap.h
@@ -0,0 +1,47 @@
+/* (C) 2017 by sysmocom s.f.m.c. GmbH
+ * All Rights Reserved
+ *
+ * Author: Philipp Maier
+ *
+ * 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/>.
+ *
+ */
+
+#pragma once
+
+/* A structure to hold tha most basic information about a sigtran connection
+ * we use this struct internally here to pass connection data around */
+struct a_conn_info {
+ struct osmo_sccp_addr *called_addr;
+ struct osmo_sccp_addr *calling_addr;
+ int conn_id;
+ struct gsm_network *network;
+};
+
+/* A structure to pack BSC clling addresses into a list */
+struct a_bsc_addr {
+ struct llist_head list;
+ struct osmo_sccp_addr called_addr;
+ struct osmo_sccp_addr calling_addr;
+ struct osmo_sccp_user *scu;
+};
+
+/* Handle incoming connection less data messages */
+void msc_handle_udt(struct osmo_sccp_user *scu, struct a_conn_info *a_conn_info, struct msgb *msg);
+
+/* Handle incoming connection oriented messages */
+int msc_handle_dt1(struct osmo_sccp_user *scu, struct a_conn_info *a_conn_info, struct msgb *msg);
+
+/* Get a list with all known BSCs */
+struct llist_head *get_bsc_addr_list(void);
diff --git a/openbsc/include/openbsc/gsm_data.h b/openbsc/include/openbsc/gsm_data.h
index cb766f8..6d82702 100644
--- a/openbsc/include/openbsc/gsm_data.h
+++ b/openbsc/include/openbsc/gsm_data.h
@@ -202,6 +202,11 @@ struct gsm_subscriber_connection {
uint16_t mgcp_rtp_port_cn;
uint8_t rab_id;
} iu;
+
+ struct {
+ struct osmo_sccp_user *scu;
+ int conn_id;
+ } a;
};
diff --git a/openbsc/include/openbsc/iu.h b/openbsc/include/openbsc/iu.h
index 0cc16d0..a0c481a 100644
--- a/openbsc/include/openbsc/iu.h
+++ b/openbsc/include/openbsc/iu.h
@@ -80,3 +80,5 @@ int iu_tx_release(struct ue_conn_ctx *ctx, const struct RANAP_Cause *cause);
void iu_vty_init(int iu_parent_node, enum nsap_addr_enc *rab_assign_addr_enc);
int iu_vty_config_write(struct vty *vty, const char *indent);
+
+struct ue_conn_ctx *ue_conn_ctx_alloc(struct osmo_sccp_addr *addr, uint32_t conn_id);
diff --git a/openbsc/include/openbsc/msc_ifaces.h b/openbsc/include/openbsc/msc_ifaces.h
index 2965c72..942e1ce 100644
--- a/openbsc/include/openbsc/msc_ifaces.h
+++ b/openbsc/include/openbsc/msc_ifaces.h
@@ -28,20 +28,18 @@
/* Each main linkage must implement this function (see comment above). */
extern int iu_tx(struct msgb *msg, uint8_t sapi);
-/* So far this is a dummy implemented in libmsc/a_iface.c. When A-interface
- * gets implemented, it should be in a separate lib (like libiu), this function
- * should move there, and the following comment should remain here: "
- * Each main linkage must implement this function (see comment above).
- * " */
+/* FIXME: Maybe the function prototypes that are implemented in a_iface.c
+ * should be moved to a_iface.h too? */
+
+/* Send DTAP message via A-interface (see also: a_iface.c) */
extern int a_tx(struct msgb *msg);
-/* So far this is a dummy implemented in libmsc/a_iface.c. When A-interface
- * gets implemented, it should be in a separate lib (like libiu), this function
- * should move there, and the following comment should remain here: "
- * Each main linkage must implement this function (see comment above).
- * " */
+/* Page a subscriber via A-interface (see also: a_iface.c) */
extern int a_page(const char *imsi, uint32_t tmsi, uint16_t lac);
+/* Send assignment request via A-interface */
+extern int a_assign(struct gsm_trans *trans);
+
int msc_tx_dtap(struct gsm_subscriber_connection *conn,
struct msgb *msg);
@@ -50,6 +48,7 @@ int msc_gsm48_tx_mm_serv_rej(struct gsm_subscriber_connection *conn,
enum gsm48_reject_value value);
/* TODO: specific to A interface, move this away */
+/* Send Cipher mode command via A-interface (see also: a_iface.c) */
int msc_gsm0808_tx_cipher_mode(struct gsm_subscriber_connection *conn, int cipher,
const uint8_t *key, int len, int include_imeisv);
diff --git a/openbsc/include/openbsc/osmo_msc.h b/openbsc/include/openbsc/osmo_msc.h
index fa7ea29..88b5f71 100644
--- a/openbsc/include/openbsc/osmo_msc.h
+++ b/openbsc/include/openbsc/osmo_msc.h
@@ -62,6 +62,8 @@ int msc_create_conn_fsm(struct gsm_subscriber_connection *conn, const char *id);
int msc_vlr_alloc(struct gsm_network *net);
int msc_vlr_start(struct gsm_network *net);
+void msc_sapi_n_reject(struct gsm_subscriber_connection *conn, int dlci);
+int msc_clear_request(struct gsm_subscriber_connection *conn, uint32_t cause);
int msc_compl_l3(struct gsm_subscriber_connection *conn,
struct msgb *msg, uint16_t chosen_channel);
void msc_dtap(struct gsm_subscriber_connection *conn, uint8_t link_id,
@@ -69,6 +71,11 @@ void msc_dtap(struct gsm_subscriber_connection *conn, uint8_t link_id,
void msc_cipher_mode_compl(struct gsm_subscriber_connection *conn,
struct msgb *msg, uint8_t alg_id);
void msc_rx_sec_mode_compl(struct gsm_subscriber_connection *conn);
+void msc_classmark_chg(struct gsm_subscriber_connection *conn,
+ const uint8_t *cm2, uint8_t cm2_len,
+ const uint8_t *cm3, uint8_t cm3_len);
+void msc_assign_fail(struct gsm_subscriber_connection *conn,
+ uint8_t cause, uint8_t *rr_cause);
void msc_subscr_conn_init(void);
bool msc_subscr_conn_is_accepted(struct gsm_subscriber_connection *conn);
diff --git a/openbsc/src/libmsc/Makefile.am b/openbsc/src/libmsc/Makefile.am
index a320f7d..50fc2a1 100644
--- a/openbsc/src/libmsc/Makefile.am
+++ b/openbsc/src/libmsc/Makefile.am
@@ -13,6 +13,7 @@ AM_CFLAGS = \
$(LIBCRYPTO_CFLAGS) \
$(LIBSMPP34_CFLAGS) \
$(LIBASN1C_CFLAGS) \
+ $(LIBOSMOSIGTRAN_CFLAGS) \
$(NULL)
noinst_HEADERS = \
@@ -25,6 +26,7 @@ noinst_LIBRARIES = \
libmsc_a_SOURCES = \
a_iface.c \
+ a_iface_bssap.c \
auth.c \
msc_vty.c \
db.c \
diff --git a/openbsc/src/libmsc/a_iface.c b/openbsc/src/libmsc/a_iface.c
index caf9d4b..3e5ffca 100644
--- a/openbsc/src/libmsc/a_iface.c
+++ b/openbsc/src/libmsc/a_iface.c
@@ -1,9 +1,8 @@
-/* A-interface implementation, from MSC to BSC */
-
-/* (C) 2016 by sysmocom s.m.f.c GmbH <info@sysmocom.de>
- *
+/* (C) 2017 by sysmocom s.f.m.c. GmbH
* All Rights Reserved
*
+ * Author: Philipp Maier
+ *
* 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
@@ -19,35 +18,212 @@
*
*/
+#include <osmocom/core/utils.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/logging.h>
-
+#include <osmocom/sigtran/sccp_helpers.h>
+#include <osmocom/gsm/gsm0808.h>
+#include <osmocom/gsm/protocol/gsm_08_08.h>
#include <openbsc/debug.h>
-
-#include <openbsc/gsm_data.h>
#include <openbsc/msc_ifaces.h>
-#include <openbsc/debug.h>
+#include <openbsc/a_iface.h>
+#include <openbsc/a_iface_bssap.h>
+#include <openbsc/transaction.h>
+/* A pointer to the GSM network we work with. By the current paradigm,
+ * there can only be one gsm_network per MSC. The pointer is set once
+ * when calling a_init() */
+static struct gsm_network *gsm_network = NULL;
+
+/* Send DTAP message via A-interface */
int a_tx(struct msgb *msg)
{
- LOGP(DMSC, LOGL_ERROR, "message to be sent to BSC, but A-interface"
- " not implemented.\n%s\n", osmo_hexdump(msg->data, msg->len));
- return -1;
+ struct gsm_subscriber_connection *conn;
+ struct msgb *msg_resp;
+
+ /* FIXME: Set this to some meaninful value! */
+ uint8_t link_id = 0x00;
+ OSMO_ASSERT(msg);
+ conn = (struct gsm_subscriber_connection *)msg->dst;
+ OSMO_ASSERT(conn);
+ OSMO_ASSERT(conn->a.scu);
+
+ LOGP(DMSC, LOGL_DEBUG, "Passing DTAP message from MSC to BSC (conn_id=%i)\n", conn->a.conn_id);
+
+ msg->l3h = msg->data;
+ msg_resp = gsm0808_create_dtap(msg, link_id);
+ if (!msg_resp) {
+ LOGP(DMSC, LOGL_ERROR, "Unable to generate BSSMAP DTAP message!\n");
+ return -EINVAL;
+ } else
+ LOGP(DMSC, LOGL_DEBUG, "Massage will be sent as BSSMAP DTAP message!\n");
+
+ LOGP(DMSC, LOGL_DEBUG, "N-DATA.req(%u, %s)\n", conn->a.conn_id, osmo_hexdump(msg_resp->data, msg_resp->len));
+ return osmo_sccp_tx_data_msg(conn->a.scu, conn->a.conn_id, msg_resp);
+}
+
+/* Send Cipher mode command via A-interface */
+int msc_gsm0808_tx_cipher_mode(struct gsm_subscriber_connection *conn,
+ int cipher, const uint8_t *key, int len, int include_imeisv)
+{
+ /* TODO generalize for A- and Iu interfaces, don't name after 08.08 */
+ struct msgb *msg_resp;
+ struct gsm0808_encrypt_info ei;
+ LOGP(DMSC, LOGL_DEBUG, "Passing Cipher mode command message from MSC to BSC (conn_id=%i)\n", conn->a.conn_id);
+ uint8_t crm = 0x01;
+ uint8_t *crm_ptr = NULL;
+
+ /* Setup encryption information */
+ if (len > ENCRY_INFO_KEY_MAXLEN || !key) {
+ LOGP(DMSC, LOGL_ERROR,
+ "Cipher mode command message could not be generated due to invalid key! (conn_id=%i)\n",
+ conn->a.conn_id);
+ return -EINVAL;
+ } else {
+ memcpy(&ei.key, key, len);
+ ei.key_len = len;
+ }
+
+ if (include_imeisv)
+ crm_ptr = &crm;
+
+ ei.perm_algo[0] = (uint8_t) (1 << cipher);
+ ei.perm_algo_len = 1;
+
+ msg_resp = gsm0808_create_cipher(&ei, crm_ptr);
+ LOGP(DMSC, LOGL_DEBUG, "N-DATA.req(%u, %s)\n", conn->a.conn_id, osmo_hexdump(msg_resp->data, msg_resp->len));
+
+ return osmo_sccp_tx_data_msg(conn->a.scu, conn->a.conn_id, msg_resp);
}
+/* Page a subscriber via A-interface */
int a_page(const char *imsi, uint32_t tmsi, uint16_t lac)
{
- LOGP(DMSC, LOGL_ERROR, "Paging to be sent to BSC, but A-interface"
- " not implemented: IMSI %s TMSI 0x%08x LAC %u\n",
- imsi, tmsi, lac);
- return -1;
+ struct a_bsc_addr *addr;
+ struct llist_head *bsc_addr_list = get_bsc_addr_list();
+ struct gsm0808_cell_id_list cil;
+ int page_count = 0;
+
+ cil.id_discr = CELL_IDENT_LAC;
+ cil.id_list_lac[0] = lac;
+ cil.id_list_len = 1;
+
+ /* Deliver paging request to all known BSCs */
+ llist_for_each_entry(addr, bsc_addr_list, list) {
+ LOGP(DMSC, LOGL_DEBUG, "Passing paging message from MSC to BSC %s (imsi=%s, tmsi=0x%08x, lac=%u)\n",
+ osmo_sccp_addr_dump(&addr->calling_addr), imsi, tmsi, lac);
+ osmo_sccp_tx_unitdata_msg(addr->scu, &addr->called_addr, &addr->calling_addr,
+ gsm0808_create_paging(imsi, &tmsi, &cil, NULL));
+ page_count++;
+ }
+
+ if (page_count <= 0)
+ LOGP(DMSC, LOGL_ERROR, "Could not deliver paging because no BSC is available!\n");
+
+ return page_count;
+}
+
+/* Send assignment request via A-interface */
+int a_assign(struct gsm_trans *trans)
+{
+ struct gsm_subscriber_connection *conn;
+ struct gsm0808_channel_type ct;
+ uint16_t cic;
+ uint16_t *cic_ptr = NULL;
+ struct sockaddr_storage *ss = NULL;
+ struct gsm0808_speech_codec_list *scl = NULL;
+ uint32_t *ci_ptr = NULL;
+
+ conn = trans->conn;
+ OSMO_ASSERT(conn);
+ struct msgb *msg;
+
+ /* FIXME: This is still work in progress */
+ /* Some fake parameters for testing */
+ ct.ch_indctr = GSM0808_CHAN_SPEECH;
+ ct.ch_rate_type = GSM0808_SPEECH_FULL_BM;
+ ct.perm_spch[0] = GSM0808_PERM_FR1;
+ ct.perm_spch_len = 1;
+
+ cic = 0x0023;
+ cic_ptr = &cic;
+
+ msg = gsm0808_create_ass(&ct, cic_ptr, ss, scl, ci_ptr);
+
+ LOGP(DMSC, LOGL_DEBUG, "N-DATA.req(%u, %s)\n", conn->a.conn_id, osmo_hexdump(msg->data, msg->len));
+ return osmo_sccp_tx_data_msg(conn->a.scu, conn->a.conn_id, msg);
+
}
-int msc_gsm0808_tx_cipher_mode(struct gsm_subscriber_connection *conn, int cipher,
- const uint8_t *key, int len, int include_imeisv)
+/* Callback function, called by the SSCP stack when data arrives */
+static int sccp_sap_up(struct osmo_prim_hdr *oph, void *_scu)
{
- /* TODO generalize for A- and Iu interfaces, don't name after 08.08 */
- LOGP(DMSC, LOGL_ERROR, "gsm0808_cipher_mode(): message to be sent to"
- " BSC, but A interface not yet implemented.\n");
- return -1;
+ struct osmo_sccp_user *scu = _scu;
+ struct osmo_scu_prim *scu_prim = (struct osmo_scu_prim *)oph;
+ int rc = 0;
+ struct a_conn_info a_conn_info;
+ memset(&a_conn_info, 0, sizeof(a_conn_info));
+ a_conn_info.network = gsm_network;
+
+ switch (OSMO_PRIM_HDR(&scu_prim->oph)) {
+ case OSMO_PRIM(OSMO_SCU_PRIM_N_CONNECT, PRIM_OP_INDICATION):
+ /* Handle inbound connection indication */
+ a_conn_info.conn_id = scu_prim->u.connect.conn_id;
+ a_conn_info.called_addr = &scu_prim->u.connect.called_addr;
+ a_conn_info.calling_addr = &scu_prim->u.connect.calling_addr;
+ osmo_sccp_tx_conn_resp(scu, scu_prim->u.connect.conn_id, &scu_prim->u.connect.called_addr, NULL, 0);
+ if (msgb_l2len(oph->msg) > 0) {
+ LOGP(DMSC, LOGL_DEBUG, "N-CONNECT.ind(%u, %s)\n",
+ scu_prim->u.connect.conn_id, osmo_hexdump(msgb_l2(oph->msg), msgb_l2len(oph->msg)));
+ rc = msc_handle_dt1(scu, &a_conn_info, oph->msg);
+ } else
+ LOGP(DMSC, LOGL_DEBUG, "N-CONNECT.ind(%u)\n", scu_prim->u.connect.conn_id);
+ break;
+
+ case OSMO_PRIM(OSMO_SCU_PRIM_N_DATA, PRIM_OP_INDICATION):
+ /* Handle incoming connection oriented data */
+ a_conn_info.conn_id = scu_prim->u.data.conn_id;
+ LOGP(DMSC, LOGL_DEBUG, "N-DATA.ind(%u, %s)\n",
+ scu_prim->u.data.conn_id, osmo_hexdump(msgb_l2(oph->msg), msgb_l2len(oph->msg)));
+ msc_handle_dt1(scu, &a_conn_info, oph->msg);
+ break;
+
+ case OSMO_PRIM(OSMO_SCU_PRIM_N_UNITDATA, PRIM_OP_INDICATION):
+ /* Handle inbound UNITDATA */
+ a_conn_info.called_addr = &scu_prim->u.unitdata.called_addr;
+ a_conn_info.calling_addr = &scu_prim->u.unitdata.calling_addr;
+ msc_handle_udt(scu, &a_conn_info, oph->msg);
+ break;
+
+ default:
+ LOGP(DMSC, LOGL_ERROR, "Unhandled SIGTRAN primitive: %u:%u\n", oph->primitive, oph->operation);
+ break;
+ }
+
+ return rc;
+}
+
+/* Initalize A interface connection between to MSC and BSC */
+int a_init(void *ctx, const char *name, uint32_t local_pc,
+ const char *listen_addr, const char *remote_addr, uint16_t local_port, struct gsm_network *network)
+{
+ /* FIXME: Clean this up! */
+ /* FIXME: Don't use the simple_server, use the simple_client instead! */
+#define RECEIVER_PC 23
+#define SSN_BSSAP 254 /* SCCP_SSN_BSSAP */
+#define SENDER_PC 1
+
+ struct osmo_sccp_instance *sccp;
+
+ gsm_network = network;
+ osmo_ss7_init();
+
+ sccp = osmo_sccp_simple_server(NULL, SENDER_PC, OSMO_SS7_ASP_PROT_M3UA, -1, "127.0.0.2");
+
+ /* Why? */
+ osmo_sccp_simple_server_add_clnt(sccp, OSMO_SS7_ASP_PROT_M3UA, "RECEIVER", RECEIVER_PC, -1, 0, NULL);
+
+ osmo_sccp_user_bind(sccp, "MSC", &sccp_sap_up, SSN_BSSAP);
+
+ return 0;
}
diff --git a/openbsc/src/libmsc/a_iface_bssap.c b/openbsc/src/libmsc/a_iface_bssap.c
new file mode 100644
index 0000000..258f125
--- /dev/null
+++ b/openbsc/src/libmsc/a_iface_bssap.c
@@ -0,0 +1,647 @@
+/* (C) 2017 by Sysmocom s.f.m.c. GmbH
+ * All Rights Reserved
+ *
+ * Author: Philipp Maier
+ *
+ * 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/core/utils.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/sigtran/sccp_helpers.h>
+#include <osmocom/sccp/sccp_types.h>
+#include <osmocom/gsm/gsm0808.h>
+#include <osmocom/gsm/gsm0808_utils.h>
+#include <openbsc/debug.h>
+#include <openbsc/gsm_data.h>
+#include <openbsc/a_iface_bssap.h>
+#include <openbsc/iu.h>
+#include <openbsc/osmo_msc.h>
+
+/* Addresses of all BSCs which have been registered to this MSC */
+static LLIST_HEAD(bsc_addr_list);
+
+/*
+ * Helper functions to lookup and allocate subscribers
+ */
+
+/* Allocate a new subscriber connection */
+static struct gsm_subscriber_connection *subscr_conn_allocate_a(struct gsm_network *network, struct ue_conn_ctx *ue,
+ uint16_t lac, struct osmo_sccp_user *scu, int conn_id)
+{
+ struct gsm_subscriber_connection *conn;
+
+ LOGP(DMSC, LOGL_NOTICE, "Allocating A-Interface subscriber conn: lac %i, conn_id %i\n", lac, ue->conn_id);
+
+ conn = talloc_zero(ue, struct gsm_subscriber_connection);
+ if (!conn)
+ return NULL;
+
+ conn->network = network;
+ conn->via_ran = RAN_GERAN_A;
+ conn->iu.ue_ctx = ue;
+ conn->iu.ue_ctx->rab_assign_addr_enc = network->iu.rab_assign_addr_enc;
+ conn->lac = lac;
+
+ conn->a.conn_id = conn_id;
+ conn->a.scu = scu;
+
+ llist_add_tail(&conn->entry, &network->subscr_conns);
+ LOGP(DMSC, LOGL_NOTICE, "A-Interface subscriber connection successfully allocated!\n");
+ return conn;
+}
+
+/* Return an existing A subscriber connection record for the given
+ * connection IDs, or return NULL if not found. */
+struct gsm_subscriber_connection *subscr_conn_lookup_a(struct gsm_network *network, int conn_id)
+{
+ struct gsm_subscriber_connection *conn;
+
+ DEBUGP(DMSC, "Looking for A subscriber: conn_id %i\n", conn_id);
+
+ /* FIXME: log_subscribers() is defined in iucs.c as static inline, if
+ * maybe this function should be public to reach it from here? */
+ /* log_subscribers(network); */
+
+ llist_for_each_entry(conn, &network->subscr_conns, entry) {
+ if (conn->via_ran == RAN_GERAN_A && conn->a.conn_id == conn_id) {
+ DEBUGP(DIUCS, "Found A subscriber for conn_id %i\n", conn_id);
+ return conn;
+ }
+ }
+ DEBUGP(DMSC, "No A subscriber found for conn_id %i\n", conn_id);
+ return NULL;
+}
+
+/*
+ * BSSMAP handling for UNITDATA
+ */
+
+/* Endpoint to handle BSSMAP reset */
+static void bssmap_handle_reset(struct osmo_sccp_user *scu, struct a_conn_info *a_conn_info, struct msgb *msg)
+{
+ struct a_bsc_addr *addr;
+ struct a_bsc_addr *known_addr;
+ bool addr_unknown = true;
+
+ LOGP(DMSC, LOGL_NOTICE, "Rx RESET from BSC %s\n", osmo_sccp_addr_dump(a_conn_info->calling_addr));
+ osmo_sccp_tx_unitdata_msg(scu, a_conn_info->called_addr, a_conn_info->calling_addr, gsm0808_create_reset_ack());
+
+ /* Check if we know this BSC already, if yes, refresh its item */
+ llist_for_each_entry(known_addr, &bsc_addr_list, list) {
+ if (memcmp(&known_addr->calling_addr, a_conn_info->calling_addr, sizeof(*a_conn_info->calling_addr)) == 0) {
+ LOGP(DMSC, LOGL_NOTICE, "This BSC is already known to this MSC, refreshing its list item\n");
+ llist_del(&known_addr->list);
+ talloc_free(known_addr);
+ addr_unknown = false;
+ break;
+ }
+ }
+ if (addr_unknown)
+ LOGP(DMSC, LOGL_NOTICE, "This BSC is not known to this MSC yet, adding it to list\n");
+
+ addr = talloc_zero(NULL, struct a_bsc_addr);
+ memcpy(&addr->calling_addr, a_conn_info->calling_addr, sizeof(addr->calling_addr));
+ memcpy(&addr->called_addr, a_conn_info->called_addr, sizeof(addr->called_addr));
+ addr->scu = scu;
+ llist_add(&addr->list, &bsc_addr_list);
+
+ msgb_free(msg);
+}
+
+/* Handle UNITDATA BSSMAP messages */
+static void bssmap_rcvmsg_udt(struct osmo_sccp_user *scu, struct a_conn_info *a_conn_info, struct msgb *msg)
+{
+ /* Note: When in the MSC role, RESET ACK is the only valid message that
+ * can be received via UNITDATA */
+
+ if (msgb_l3len(msg) < 1) {
+ LOGP(DMSC, LOGL_NOTICE, "Error: No data received -- discarding message!\n");
+ return;
+ }
+
+ LOGP(DMSC, LOGL_NOTICE, "Rx BSC UDT BSSMAP %s\n", gsm0808_bssmap_name(msg->l3h[0]));
+
+ switch (msg->l3h[0]) {
+ case BSS_MAP_MSG_RESET:
+ bssmap_handle_reset(scu, a_conn_info, msg);
+ break;
+ default:
+ LOGP(DMSC, LOGL_NOTICE, "Unimplemented message format: %s -- message discarded!\n",
+ gsm0808_bssmap_name(msg->l3h[0]));
+ msgb_free(msg);
+ }
+}
+
+/* Handle incoming connection less data messages */
+void msc_handle_udt(struct osmo_sccp_user *scu, struct a_conn_info *a_conn_info, struct msgb *msg)
+{
+ /* Note: The only valid message type that can be received
+ * via UNITDATA are BSS Management messages */
+ struct bssmap_header *bs;
+
+ LOGP(DMSC, LOGL_NOTICE, "Rx BSC UDT: %s\n", osmo_hexdump(msgb_l2(msg), msgb_l2len(msg)));
+
+ if (msgb_l2len(msg) < sizeof(*bs)) {
+ LOGP(DMSC, LOGL_ERROR, "Error: Header is too short -- discarding message!\n");
+ msgb_free(msg);
+ return;
+ }
+
+ bs = (struct bssmap_header *)msgb_l2(msg);
+ if (bs->length < msgb_l2len(msg) - sizeof(*bs)) {
+ LOGP(DMSC, LOGL_ERROR, "Error: Message is too short -- discarding message!\n");
+ msgb_free(msg);
+ return;
+ }
+
+ switch (bs->type) {
+ case BSSAP_MSG_BSS_MANAGEMENT:
+ msg->l3h = &msg->l2h[sizeof(struct bssmap_header)];
+ bssmap_rcvmsg_udt(scu, a_conn_info, msg);
+ break;
+ default:
+ LOGP(DMSC, LOGL_ERROR,
+ "Error: Unimplemented message type: %s -- message discarded!\n", gsm0808_bssmap_name(bs->type));
+ msgb_free(msg);
+ }
+}
+
+/*
+ * BSSMAP handling for connection oriented data
+ */
+
+/* Endpoint to handle BSSMAP clear request */
+static int bssmap_handle_clear_rqst(struct osmo_sccp_user *scu, struct a_conn_info *a_conn_info, struct msgb *msg)
+{
+ struct gsm_network *network = a_conn_info->network;
+ struct tlv_parsed tp;
+ int rc;
+ struct msgb *msg_resp;
+ uint8_t cause;
+ struct gsm_subscriber_connection *conn;
+
+ LOGP(DMSC, LOGL_NOTICE, "BSC requested to clear connection (conn_id=%i)\n", a_conn_info->conn_id);
+
+ tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 1, msgb_l3len(msg) - 1, 0, 0);
+ if (!TLVP_PRESENT(&tp, GSM0808_IE_CAUSE)) {
+ LOGP(DMSC, LOGL_ERROR, "Cause code is missing -- discarding message!\n");
+ goto fail;
+ }
+ cause = TLVP_VAL(&tp, GSM0808_IE_CAUSE)[0];
+
+ /* Respond with clear command */
+ msg_resp = gsm0808_create_clear_command(GSM0808_CAUSE_CALL_CONTROL);
+ rc = osmo_sccp_tx_data_msg(scu, a_conn_info->conn_id, msg_resp);
+
+ /* If possible, inform the MSC about the clear request */
+ conn = subscr_conn_lookup_a(network, a_conn_info->conn_id);
+ if (!conn)
+ goto fail;
+ msc_clear_request(conn, cause);
+
+ msgb_free(msg);
+ return rc;
+
+fail:
+ msgb_free(msg);
+ return -EINVAL;
+}
+
+/* Endpoint to handle BSSMAP clear complete */
+static int bssmap_handle_clear_complete(struct osmo_sccp_user *scu, struct a_conn_info *a_conn_info, struct msgb *msg)
+{
+ int rc;
+
+ LOGP(DMSC, LOGL_NOTICE, "Releasing connection (conn_id=%i)\n", a_conn_info->conn_id);
+ rc = osmo_sccp_tx_disconn(scu, a_conn_info->conn_id,
+ a_conn_info->called_addr, SCCP_RELEASE_CAUSE_END_USER_ORIGINATED);
+
+ msgb_free(msg);
+ return rc;
+}
+
+/* Endpoint to handle layer 3 complete messages */
+static int bssmap_handle_l3_compl(struct osmo_sccp_user *scu, struct a_conn_info *a_conn_info, struct msgb *msg)
+{
+ struct tlv_parsed tp;
+ struct {
+ uint8_t ident;
+ struct gsm48_loc_area_id lai;
+ uint16_t ci;
+ } __attribute__ ((packed)) lai_ci;
+ uint16_t mcc;
+ uint16_t mnc;
+ uint16_t lac;
+ uint8_t data_length;
+ const uint8_t *data;
+ int rc;
+
+ struct gsm_network *network = a_conn_info->network;
+ struct ue_conn_ctx *ue;
+ struct gsm_subscriber_connection *conn;
+
+ LOGP(DMSC, LOGL_NOTICE, "BSC has completed layer 3 connection (conn_id=%i)\n", a_conn_info->conn_id);
+
+ tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 1, msgb_l3len(msg) - 1, 0, 0);
+ if (!TLVP_PRESENT(&tp, GSM0808_IE_CELL_IDENTIFIER)) {
+ LOGP(DMSC, LOGL_ERROR, "Mandatory CELL IDENTIFIER not present -- discarding message!\n");
+ goto fail;
+ }
+ if (!TLVP_PRESENT(&tp, GSM0808_IE_LAYER_3_INFORMATION)) {
+ LOGP(DMSC, LOGL_ERROR, "Mandatory LAYER 3 INFORMATION not present -- discarding message!\n");
+ goto fail;
+ }
+
+ /* Parse Cell ID element */
+ /* FIXME: Encapsulate this in a parser/generator function inside
+ * libosmocore, add support for all specified cell identification
+ * discriminators (see 3GPP ts 3.2.2.17 Cell Identifier) */
+ data_length = TLVP_LEN(&tp, GSM0808_IE_CELL_IDENTIFIER);
+ data = TLVP_VAL(&tp, GSM0808_IE_CELL_IDENTIFIER);
+ if (sizeof(lai_ci) != data_length) {
+ LOGP(DMSC, LOGL_ERROR,
+ "Unable to parse element CELL IDENTIFIER (wrong field length) -- discarding message!\n");
+ goto fail;
+ }
+ memcpy(&lai_ci, data, sizeof(lai_ci));
+ if (lai_ci.ident != CELL_IDENT_WHOLE_GLOBAL) {
+ LOGP(DMSC, LOGL_ERROR,
+ "Unable to parse element CELL IDENTIFIER (wrong cell identification discriminator) -- discarding message!\n");
+ goto fail;
+ }
+ if (gsm48_decode_lai(&lai_ci.lai, &mcc, &mnc, &lac) != 0) {
+ LOGP(DMSC, LOGL_ERROR,
+ "Unable to parse element CELL IDENTIFIER (lai decoding failed) -- discarding message!\n");
+ goto fail;
+ }
+
+ /* Parse Layer 3 Information element */
+ /* FIXME: This is probably to hackish, compiler also complains "assignment discards ‘const’ qualifier..." */
+ msg->l3h = TLVP_VAL(&tp, GSM0808_IE_LAYER_3_INFORMATION);
+ msg->tail = msg->l3h + TLVP_LEN(&tp, GSM0808_IE_LAYER_3_INFORMATION);
+
+ /* Create new subscriber context */
+ ue = ue_conn_ctx_alloc(a_conn_info->calling_addr, a_conn_info->conn_id);
+ conn = subscr_conn_allocate_a(network, ue, lac, scu, a_conn_info->conn_id);
+
+ /* Handover location update to the MSC code */
+ /* msc_compl_l3() takes ownership of dtap_msg
+ * message buffer */
+ rc = msc_compl_l3(conn, msg, 0);
+ if (rc == MSC_CONN_ACCEPT) {
+ LOGP(DMSC, LOGL_NOTICE, "User has been accepted by MSC.\n");
+ return 0;
+ } else if (rc == MSC_CONN_REJECT)
+ LOGP(DMSC, LOGL_NOTICE, "User has been rejected by MSC.\n");
+ else
+ LOGP(DMSC, LOGL_NOTICE, "User has been rejected by MSC (unknown error)\n");
+
+ return -EINVAL;
+
+fail:
+ msgb_free(msg);
+ return -EINVAL;
+}
+
+/* Endpoint to handle BSSMAP classmark update */
+static int bssmap_classmark_upd(struct osmo_sccp_user *scu, struct a_conn_info *a_conn_info, struct msgb *msg)
+{
+ struct gsm_network *network = a_conn_info->network;
+ struct gsm_subscriber_connection *conn;
+ struct tlv_parsed tp;
+ const uint8_t *cm2 = NULL;
+ const uint8_t *cm3 = NULL;
+ uint8_t cm2_len = 0;
+ uint8_t cm3_len = 0;
+
+ conn = subscr_conn_lookup_a(network, a_conn_info->conn_id);
+ if (!conn)
+ goto fail;
+
+ LOGP(DMSC, LOGL_NOTICE, "BSC sends clasmark update (conn_id=%i)\n", conn->a.conn_id);
+
+ tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 1, msgb_l3len(msg) - 1, 0, 0);
+ if (!TLVP_PRESENT(&tp, GSM0808_IE_CLASSMARK_INFORMATION_T2)) {
+ LOGP(DMSC, LOGL_ERROR, "Mandatory Classmark Information Type 2 not present -- discarding message!\n");
+ goto fail;
+ }
+
+ cm2 = TLVP_VAL(&tp, GSM0808_IE_CLASSMARK_INFORMATION_T2);
+ cm2_len = TLVP_LEN(&tp, GSM0808_IE_CLASSMARK_INFORMATION_T2);
+
+ if (TLVP_PRESENT(&tp, GSM0808_IE_CLASSMARK_INFORMATION_T3)) {
+ cm3 = TLVP_VAL(&tp, GSM0808_IE_CLASSMARK_INFORMATION_T3);
+ cm3_len = TLVP_LEN(&tp, GSM0808_IE_CLASSMARK_INFORMATION_T3);
+ }
+
+ /* Inform MSC about the classmark change */
+ msc_classmark_chg(conn, cm2, cm2_len, cm3, cm3_len);
+
+ msgb_free(msg);
+ return 0;
+
+fail:
+ msgb_free(msg);
+ return -EINVAL;
+}
+
+/* Endpoint to handle BSSMAP cipher mode complete */
+static int bssmap_ciph_compl(struct osmo_sccp_user *scu, struct a_conn_info *a_conn_info, struct msgb *msg)
+{
+ /* FIXME: The field GSM0808_IE_LAYER_3_MESSAGE_CONTENTS is optional by
+ * means of the specification. So there can be messages without L3 info.
+ * In this case, the code will crash becrause msc_cipher_mode_compl()
+ * is not able to deal with msg = NULL and apperently
+ * msc_cipher_mode_compl() was never meant to be used without L3 data.
+ * This needs to be discussed further! */
+
+ struct gsm_network *network = a_conn_info->network;
+ struct gsm_subscriber_connection *conn;
+ struct tlv_parsed tp;
+ uint8_t alg_id = 1;
+
+ conn = subscr_conn_lookup_a(network, a_conn_info->conn_id);
+ if (!conn)
+ goto fail;
+
+ LOGP(DMSC, LOGL_NOTICE, "BSC sends cipher mode complete (conn_id=%i)\n", conn->a.conn_id);
+
+ tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 1, msgb_l3len(msg) - 1, 0, 0);
+
+ if (TLVP_PRESENT(&tp, GSM0808_IE_CHOSEN_ENCR_ALG)) {
+ alg_id = TLVP_VAL(&tp, GSM0808_IE_CHOSEN_ENCR_ALG)[0] - 1;
+ }
+
+ if (TLVP_PRESENT(&tp, GSM0808_IE_LAYER_3_MESSAGE_CONTENTS)) {
+ msg->l3h = TLVP_VAL(&tp, GSM0808_IE_LAYER_3_MESSAGE_CONTENTS);
+ msg->tail = msg->l3h + TLVP_LEN(&tp, GSM0808_IE_LAYER_3_MESSAGE_CONTENTS);
+ } else {
+ msgb_free(msg);
+ msg = NULL;
+ }
+
+ /* Hand over cipher mode complete message to the MSC,
+ * msc_cipher_mode_compl() takes ownership for msg */
+ msc_cipher_mode_compl(conn, msg, alg_id);
+
+ return 0;
+fail:
+ msgb_free(msg);
+ return -EINVAL;
+}
+
+/* Endpoint to handle BSSMAP cipher mode reject */
+static int bssmap_ciph_rej(struct osmo_sccp_user *scu, struct a_conn_info *a_conn_info, struct msgb *msg)
+{
+ struct gsm_network *network = a_conn_info->network;
+ struct gsm_subscriber_connection *conn;
+ struct tlv_parsed tp;
+ uint8_t cause;
+
+ conn = subscr_conn_lookup_a(network, a_conn_info->conn_id);
+ if (!conn)
+ goto fail;
+
+ LOGP(DMSC, LOGL_NOTICE, "BSC sends cipher mode reject (conn_id=%i)\n", conn->a.conn_id);
+
+ tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 1, msgb_l3len(msg) - 1, 0, 0);
+ if (!TLVP_PRESENT(&tp, BSS_MAP_MSG_CIPHER_MODE_REJECT)) {
+ LOGP(DMSC, LOGL_ERROR, "Cause code is missing -- discarding message!\n");
+ goto fail;
+ }
+
+ cause = TLVP_VAL(&tp, BSS_MAP_MSG_CIPHER_MODE_REJECT)[0];
+ LOGP(DMSC, LOGL_NOTICE, "Cipher mode rejection cause: %i\n", cause);
+
+ /* FIXME: Can we do something meaningful here? e.g. report to the
+ * msc code somehow that the cipher mode command has failed. */
+
+ msgb_free(msg);
+ return 0;
+fail:
+ msgb_free(msg);
+ return -EINVAL;
+}
+
+/* Endpoint to handle BSSMAP assignment failure */
+static int bssmap_ass_fail(struct osmo_sccp_user *scu, struct a_conn_info *a_conn_info, struct msgb *msg)
+{
+ struct gsm_network *network = a_conn_info->network;
+ struct gsm_subscriber_connection *conn;
+ struct tlv_parsed tp;
+ uint8_t cause;
+ uint8_t *rr_cause_ptr = NULL;
+ uint8_t rr_cause;
+
+ conn = subscr_conn_lookup_a(network, a_conn_info->conn_id);
+ if (!conn)
+ goto fail;
+
+ LOGP(DMSC, LOGL_NOTICE, "BSC sends assignment failure message (conn_id=%i)\n", conn->a.conn_id);
+
+ tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 1, msgb_l3len(msg) - 1, 0, 0);
+ if (!TLVP_PRESENT(&tp, GSM0808_IE_CAUSE)) {
+ LOGP(DMSC, LOGL_ERROR, "Cause code is missing -- discarding message!\n");
+ goto fail;
+ }
+ cause = TLVP_VAL(&tp, GSM0808_IE_CAUSE)[0];
+
+ if (TLVP_PRESENT(&tp, GSM0808_IE_RR_CAUSE)) {
+ rr_cause = TLVP_VAL(&tp, GSM0808_IE_RR_CAUSE)[0];
+ rr_cause_ptr = &rr_cause;
+ }
+
+ /* FIXME: In AoIP, the Assignment failure will carry also an optional
+ * Codec List (BSS Supported) element. It has to be discussed if we
+ * can ignore this element. If not, The msc_assign_fail() function
+ * call has to change. However msc_assign_fail() does nothing in the
+ * end. So probably we can just leave it as it is. Even for AoIP */
+
+ /* Inform the MSC about the assignment failure event */
+ msc_assign_fail(conn, cause, rr_cause_ptr);
+
+ msgb_free(msg);
+ return 0;
+fail:
+ msgb_free(msg);
+ return -EINVAL;
+}
+
+/* Endpoint to handle sapi "n" reject */
+static int bssmap_sapi_n_rej(struct osmo_sccp_user *scu, struct a_conn_info *a_conn_info, struct msgb *msg)
+{
+ struct gsm_network *network = a_conn_info->network;
+ struct gsm_subscriber_connection *conn;
+ struct tlv_parsed tp;
+ uint8_t dlci;
+
+ conn = subscr_conn_lookup_a(network, a_conn_info->conn_id);
+ if (!conn)
+ goto fail;
+
+ LOGP(DMSC, LOGL_NOTICE, "BSC sends sapi \"n\" reject message (conn_id=%i)\n", conn->a.conn_id);
+
+ /* Note: The MSC code seems not to care about the cause code, but by
+ * the specification it is mandatory, so we check its presence. See
+ * also 3GPP TS 48.008 3.2.1.34 SAPI "n" REJECT */
+ tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 1, msgb_l3len(msg) - 1, 0, 0);
+ if (!TLVP_PRESENT(&tp, GSM0808_IE_CAUSE)) {
+ LOGP(DMSC, LOGL_ERROR, "Cause code is missing -- discarding message!\n");
+ goto fail;
+ }
+
+ tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 1, msgb_l3len(msg) - 1, 0, 0);
+ if (!TLVP_PRESENT(&tp, GSM0808_IE_DLCI)) {
+ LOGP(DMSC, LOGL_ERROR, "DLCI is missing -- discarding message!\n");
+ goto fail;
+ }
+ dlci = TLVP_VAL(&tp, GSM0808_IE_DLCI)[0];
+
+ /* Inform the MSC about the sapi "n" reject event */
+ msc_sapi_n_reject(conn, dlci);
+
+ msgb_free(msg);
+ return 0;
+fail:
+ msgb_free(msg);
+ return -EINVAL;
+}
+
+/* Endpoint to handle assignment complete */
+static int bssmap_ass_compl(struct osmo_sccp_user *scu, struct a_conn_info *a_conn_info, struct msgb *msg)
+{
+ struct gsm_network *network = a_conn_info->network;
+ struct gsm_subscriber_connection *conn;
+
+ conn = subscr_conn_lookup_a(network, a_conn_info->conn_id);
+ if (!conn)
+ goto fail;
+
+ LOGP(DMSC, LOGL_NOTICE, "BSC sends assignment complete message (conn_id=%i)\n", conn->a.conn_id);
+
+ /* Inform the MSC about the assignment completion event */
+ msc_rx_sec_mode_compl(conn);
+
+ msgb_free(msg);
+ return 0;
+fail:
+ msgb_free(msg);
+ return -EINVAL;
+}
+
+/* Handle incoming connection oriented BSSMAP messages */
+static int bssmap_rcvmsg_dt1(struct osmo_sccp_user *scu, struct a_conn_info *a_conn_info, struct msgb *msg)
+{
+ if (msgb_l3len(msg) < 1) {
+ LOGP(DMSC, LOGL_NOTICE, "Error: No data received -- discarding message!\n");
+ msgb_free(msg);
+ return -1;
+ }
+
+ LOGP(DMSC, LOGL_NOTICE, "Rx MSC DT1 BSSMAP %s\n", gsm0808_bssmap_name(msg->l3h[0]));
+
+ switch (msg->l3h[0]) {
+ case BSS_MAP_MSG_CLEAR_RQST:
+ return bssmap_handle_clear_rqst(scu, a_conn_info, msg);
+ break;
+ case BSS_MAP_MSG_CLEAR_COMPLETE:
+ return bssmap_handle_clear_complete(scu, a_conn_info, msg);
+ break;
+ case BSS_MAP_MSG_COMPLETE_LAYER_3:
+ return bssmap_handle_l3_compl(scu, a_conn_info, msg);
+ break;
+ case BSS_MAP_MSG_CLASSMARK_UPDATE:
+ return bssmap_classmark_upd(scu, a_conn_info, msg);
+ break;
+ case BSS_MAP_MSG_CIPHER_MODE_COMPLETE:
+ return bssmap_ciph_compl(scu, a_conn_info, msg);
+ break;
+ case BSS_MAP_MSG_CIPHER_MODE_REJECT:
+ return bssmap_ciph_rej(scu, a_conn_info, msg);
+ break;
+ case BSS_MAP_MSG_ASSIGMENT_FAILURE:
+ return bssmap_ass_fail(scu, a_conn_info, msg);
+ break;
+ case BSS_MAP_MSG_SAPI_N_REJECT:
+ return bssmap_sapi_n_rej(scu, a_conn_info, msg);
+ break;
+ case BSS_MAP_MSG_ASSIGMENT_COMPLETE:
+ return bssmap_ass_compl(scu, a_conn_info, msg);
+ break;
+ default:
+ LOGP(DMSC, LOGL_ERROR, "Unimplemented msg type: %s\n", gsm0808_bssmap_name(msg->l3h[0]));
+ msgb_free(msg);
+ return -EINVAL;
+ }
+
+ return -EINVAL;
+}
+
+/* Endpoint to handle regular BSSAP DTAP messages */
+static int dtap_rcvmsg(struct osmo_sccp_user *scu, struct a_conn_info *a_conn_info, struct msgb *msg)
+{
+ struct gsm_network *network = a_conn_info->network;
+ struct gsm_subscriber_connection *conn;
+
+ conn = subscr_conn_lookup_a(network, a_conn_info->conn_id);
+ if (!conn) {
+ msgb_free(msg);
+ return -EINVAL;
+ }
+
+ LOGP(DMSC, LOGL_NOTICE, "BSC sends layer 3 dtap (conn_id=%i)\n", conn->a.conn_id);
+
+ /* msc_dtap expects the dtap payload in l3h */
+ msg->l3h = msg->l2h + 3;
+
+ /* Forward dtap payload into the msc,
+ * msc_dtap() takes ownership for msg */
+ msc_dtap(conn, conn->a.conn_id, msg);
+
+ return 0;
+}
+
+/* Handle incoming connection oriented messages */
+int msc_handle_dt1(struct osmo_sccp_user *scu, struct a_conn_info *a_conn_info, struct msgb *msg)
+{
+ if (msgb_l2len(msg) < sizeof(struct bssmap_header)) {
+ LOGP(DMSC, LOGL_NOTICE, "The header is too short -- discarding message!\n");
+ msgb_free(msg);
+ }
+
+ switch (msg->l2h[0]) {
+ case BSSAP_MSG_BSS_MANAGEMENT:
+ msg->l3h = &msg->l2h[sizeof(struct bssmap_header)];
+ return bssmap_rcvmsg_dt1(scu, a_conn_info, msg);
+ break;
+ case BSSAP_MSG_DTAP:
+ return dtap_rcvmsg(scu, a_conn_info, msg);
+ break;
+ default:
+ LOGP(DMSC, LOGL_ERROR, "Unimplemented BSSAP msg type: %s\n", gsm0808_bssap_name(msg->l2h[0]));
+ msgb_free(msg);
+ return -EINVAL;
+ }
+
+ return -EINVAL;
+}
+
+/* Get a list with all known BSCs */
+struct llist_head *get_bsc_addr_list(void)
+{
+ return &bsc_addr_list;
+}
diff --git a/openbsc/src/libmsc/msc_ifaces.c b/openbsc/src/libmsc/msc_ifaces.c
index 1a7d878..e0e4773 100644
--- a/openbsc/src/libmsc/msc_ifaces.c
+++ b/openbsc/src/libmsc/msc_ifaces.c
@@ -213,10 +213,7 @@ int msc_call_assignment(struct gsm_trans *trans)
switch (conn->via_ran) {
case RAN_GERAN_A:
- LOGP(DMSC, LOGL_ERROR,
- "msc_call_assignment(): A-interface BSSMAP Assignment"
- " Request not yet implemented\n");
- return -ENOTSUP;
+ return a_assign(trans);
case RAN_UTRAN_IU:
#ifdef BUILD_IU
diff --git a/openbsc/src/libmsc/osmo_msc.c b/openbsc/src/libmsc/osmo_msc.c
index bfe5343..b9607e3 100644
--- a/openbsc/src/libmsc/osmo_msc.c
+++ b/openbsc/src/libmsc/osmo_msc.c
@@ -33,7 +33,7 @@
#include <openbsc/gsm_04_11.h>
/* Receive a SAPI-N-REJECT from BSC */
-static void msc_sapi_n_reject(struct gsm_subscriber_connection *conn, int dlci)
+void msc_sapi_n_reject(struct gsm_subscriber_connection *conn, int dlci)
{
int sapi = dlci & 0x7;
@@ -106,24 +106,24 @@ void msc_dtap(struct gsm_subscriber_connection *conn, uint8_t link_id, struct ms
}
/* Receive an ASSIGNMENT COMPLETE from BSC */
-static void msc_assign_compl(struct gsm_subscriber_connection *conn,
- uint8_t rr_cause, uint8_t chosen_channel,
- uint8_t encr_alg_id, uint8_t speec)
+void msc_assign_compl(struct gsm_subscriber_connection *conn,
+ uint8_t rr_cause, uint8_t chosen_channel,
+ uint8_t encr_alg_id, uint8_t speec)
{
LOGP(DRR, LOGL_DEBUG, "MSC assign complete (do nothing).\n");
}
/* Receive an ASSIGNMENT FAILURE from BSC */
-static void msc_assign_fail(struct gsm_subscriber_connection *conn,
- uint8_t cause, uint8_t *rr_cause)
+void msc_assign_fail(struct gsm_subscriber_connection *conn,
+ uint8_t cause, uint8_t *rr_cause)
{
LOGP(DRR, LOGL_DEBUG, "MSC assign failure (do nothing).\n");
}
/* Receive a CLASSMARK CHNAGE from BSC */
-static void msc_classmark_chg(struct gsm_subscriber_connection *conn,
- const uint8_t *cm2, uint8_t cm2_len,
- const uint8_t *cm3, uint8_t cm3_len)
+void msc_classmark_chg(struct gsm_subscriber_connection *conn,
+ const uint8_t *cm2, uint8_t cm2_len,
+ const uint8_t *cm3, uint8_t cm3_len)
{
conn->classmark.classmark2_len = cm2_len;
memcpy(conn->classmark.classmark2, cm2, cm2_len);
@@ -238,7 +238,7 @@ void msc_subscr_con_free(struct gsm_subscriber_connection *conn)
}
/* Receive a CLEAR REQUEST from BSC */
-static int msc_clear_request(struct gsm_subscriber_connection *conn, uint32_t cause)
+int msc_clear_request(struct gsm_subscriber_connection *conn, uint32_t cause)
{
msc_subscr_conn_close(conn, cause);
return 1;
diff --git a/openbsc/src/osmo-msc/msc_main.c b/openbsc/src/osmo-msc/msc_main.c
index 82c2c42..7306973 100644
--- a/openbsc/src/osmo-msc/msc_main.c
+++ b/openbsc/src/osmo-msc/msc_main.c
@@ -65,12 +65,14 @@
#include <openbsc/osmo_bsc_rf.h>
#include <openbsc/smpp.h>
#include <osmocom/sigtran/sccp_sap.h>
+#include <osmocom/sigtran/osmo_ss7.h>
#include <openbsc/mgcpgw_client.h>
#include <openbsc/msc_ifaces.h>
#include <openbsc/iu.h>
#include <openbsc/iucs.h>
#include <openbsc/iucs_ranap.h>
+#include <openbsc/a_iface.h>
static const char * const osmomsc_copyright =
"OsmoMSC - Osmocom Circuit-Switched Core Network implementation\r\n"
@@ -505,7 +507,10 @@ TODO: we probably want some of the _net_ ctrl commands from bsc_base_ctrl_cmds_i
/* TODO: implement A-Interface and remove above legacy stuff. */
/* Set up IuCS */
- iu_init(tall_msc_ctx, "OsmoMSC", 1, "127.0.0.3", "127.0.0.1", 0, rcvmsg_iu_cs, rx_iu_event);
+ //iu_init(tall_msc_ctx, "OsmoMSC", 1, "127.0.0.3", "127.0.0.1", 0, rcvmsg_iu_cs, rx_iu_event);
+
+ /* Set up A interface */
+ a_init(tall_msc_ctx, "OsmoMSC_A", 254, "127.0.0.3", "127.0.0.1", 0, msc_network);
if (msc_cmdline_config.daemonize) {
rc = osmo_daemonize();
diff --git a/openbsc/tests/libiudummy/iudummy.c b/openbsc/tests/libiudummy/iudummy.c
index 9dae941..8efb4fa 100644
--- a/openbsc/tests/libiudummy/iudummy.c
+++ b/openbsc/tests/libiudummy/iudummy.c
@@ -61,3 +61,9 @@ int iu_tx_release(struct ue_conn_ctx *ctx, const struct RANAP_Cause *cause)
LOGP(DLGLOBAL, LOGL_INFO, "iu_tx_release() dummy called, NOT sending Release\n");
return 0;
}
+
+struct ue_conn_ctx *ue_conn_ctx_alloc(struct osmo_sccp_addr *addr, uint32_t conn_id)
+{
+ LOGP(DLGLOBAL, LOGL_INFO, "ue_conn_ctx_alloc() dummy called, NOT allocating UE context\n");
+ return NULL;
+}
diff --git a/openbsc/tests/msc_vlr/Makefile.am b/openbsc/tests/msc_vlr/Makefile.am
index 4494d95..8c74e64 100644
--- a/openbsc/tests/msc_vlr/Makefile.am
+++ b/openbsc/tests/msc_vlr/Makefile.am
@@ -12,6 +12,7 @@ AM_CFLAGS = \
$(LIBCRYPTO_CFLAGS) \
$(LIBOSMOVTY_CFLAGS) \
$(LIBOSMOABIS_CFLAGS) \
+ $(LIBOSMOSIGTRAN_CFLAGS) \
$(NULL)
noinst_HEADERS = \
@@ -54,6 +55,7 @@ LDADD = \
$(LIBCRYPTO_LIBS) \
$(LIBOSMOVTY_LIBS) \
$(LIBOSMOABIS_LIBS) \
+ $(LIBOSMOSIGTRAN_LIBS) \
-ldbi \
-lrt \
$(NULL)
diff --git a/openbsc/tests/sms_queue/Makefile.am b/openbsc/tests/sms_queue/Makefile.am
index 011d9fd..a6a7a6f 100644
--- a/openbsc/tests/sms_queue/Makefile.am
+++ b/openbsc/tests/sms_queue/Makefile.am
@@ -8,6 +8,8 @@ AM_CFLAGS = \
-ggdb3 \
$(LIBOSMOCORE_CFLAGS) \
$(LIBOSMOGSM_CFLAGS) \
+ $(LIBOSMOSIGTRAN_CFLAGS) \
+ $(LIBOSMORANAP_CFLAGS) \
$(NULL)
EXTRA_DIST = \
@@ -38,6 +40,8 @@ sms_queue_test_LDADD = \
$(LIBCRYPTO_LIBS) \
$(LIBOSMOVTY_LIBS) \
$(LIBOSMOABIS_LIBS) \
+ $(LIBOSMOSIGTRAN_LIBS) \
+ $(LIBOSMORANAP_LIBS) \
-ldbi \
-lrt \
$(NULL)