253 lines
7.0 KiB
C
253 lines
7.0 KiB
C
/* Code to manage MSC subscriber connections over IuCS interface */
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/*
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* (C) 2016,2017 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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*
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* Author: Neels Hofmeyr <nhofmeyr@sysmocom.de>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <inttypes.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/ranap/iu_client.h>
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#include <osmocom/msc/debug.h>
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#include <osmocom/msc/gsm_data.h>
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#include <osmocom/msc/gsm_subscriber.h>
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#include <osmocom/msc/transaction.h>
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#include <osmocom/msc/osmo_msc.h>
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#include <osmocom/msc/vlr.h>
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#include <osmocom/core/byteswap.h>
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#include "../../bscconfig.h"
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#ifdef BUILD_IU
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#include <osmocom/ranap/iu_client.h>
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extern struct msgb *ranap_new_msg_rab_assign_voice(uint8_t rab_id,
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uint32_t rtp_ip,
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uint16_t rtp_port,
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bool use_x213_nsap);
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#else
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#include <osmocom/msc/iu_dummy.h>
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#endif /* BUILD_IU */
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/* For A-interface see libbsc/bsc_api.c subscr_con_allocate() */
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static struct gsm_subscriber_connection *subscr_conn_allocate_iu(struct gsm_network *network,
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struct ranap_ue_conn_ctx *ue,
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uint16_t lac)
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{
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struct gsm_subscriber_connection *conn;
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DEBUGP(DIUCS, "Allocating IuCS subscriber conn: lac %d, conn_id %" PRIx32 "\n",
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lac, ue->conn_id);
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conn = msc_subscr_conn_alloc(network, RAN_UTRAN_IU, lac);
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if (!conn)
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return NULL;
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conn->iu.ue_ctx = ue;
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conn->iu.ue_ctx->rab_assign_addr_enc = network->iu.rab_assign_addr_enc;
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return conn;
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}
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static int same_ue_conn(struct ranap_ue_conn_ctx *a, struct ranap_ue_conn_ctx *b)
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{
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if (a == b)
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return 1;
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return (a->conn_id == b->conn_id);
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}
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static inline void log_subscribers(struct gsm_network *network)
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{
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if (!log_check_level(DIUCS, LOGL_DEBUG))
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return;
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struct gsm_subscriber_connection *conn;
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int i = 0;
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llist_for_each_entry(conn, &network->subscr_conns, entry) {
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DEBUGP(DIUCS, "%3d: %s", i, vlr_subscr_name(conn->vsub));
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switch (conn->via_ran) {
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case RAN_UTRAN_IU:
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DEBUGPC(DIUCS, " Iu");
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if (conn->iu.ue_ctx) {
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DEBUGPC(DIUCS, " conn_id %d",
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conn->iu.ue_ctx->conn_id
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);
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}
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break;
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case RAN_GERAN_A:
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DEBUGPC(DIUCS, " A");
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/* TODO log A-interface connection details */
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break;
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case RAN_UNKNOWN:
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DEBUGPC(DIUCS, " ?");
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break;
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default:
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DEBUGPC(DIUCS, " invalid");
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break;
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}
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DEBUGPC(DIUCS, "\n");
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i++;
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}
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DEBUGP(DIUCS, "subscribers registered: %d\n", i);
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}
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/* Return an existing IuCS subscriber connection record for the given
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* connection IDs, or return NULL if not found. */
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struct gsm_subscriber_connection *subscr_conn_lookup_iu(
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struct gsm_network *network,
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struct ranap_ue_conn_ctx *ue)
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{
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struct gsm_subscriber_connection *conn;
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DEBUGP(DIUCS, "Looking for IuCS subscriber: conn_id %" PRIx32 "\n",
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ue->conn_id);
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log_subscribers(network);
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llist_for_each_entry(conn, &network->subscr_conns, entry) {
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if (conn->via_ran != RAN_UTRAN_IU)
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continue;
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if (!same_ue_conn(conn->iu.ue_ctx, ue))
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continue;
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DEBUGP(DIUCS, "Found IuCS subscriber for conn_id %" PRIx32 "\n",
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ue->conn_id);
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return conn;
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}
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DEBUGP(DIUCS, "No IuCS subscriber found for conn_id %" PRIx32 "\n",
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ue->conn_id);
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return NULL;
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}
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/* Receive MM/CC/... message from IuCS (SCCP user SAP).
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* msg->dst must reference a struct ranap_ue_conn_ctx, which identifies the peer that
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* sent the msg.
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*
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* For A-interface see libbsc/bsc_api.c gsm0408_rcvmsg(). */
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int gsm0408_rcvmsg_iucs(struct gsm_network *network, struct msgb *msg,
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uint16_t *lac)
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{
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int rc;
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struct ranap_ue_conn_ctx *ue_ctx;
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struct gsm_subscriber_connection *conn;
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ue_ctx = (struct ranap_ue_conn_ctx*)msg->dst;
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/* TODO: are there message types that could allow us to skip this
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* search? */
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conn = subscr_conn_lookup_iu(network, ue_ctx);
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if (conn && lac && (conn->lac != *lac)) {
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LOGP(DIUCS, LOGL_ERROR, "IuCS subscriber has changed LAC"
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" within the same connection, discarding connection:"
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" %s from LAC %d to %d\n",
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vlr_subscr_name(conn->vsub), conn->lac, *lac);
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/* Deallocate conn with previous LAC */
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msc_subscr_conn_close(conn, GSM_CAUSE_INV_MAND_INFO);
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/* At this point we could be tolerant and allocate a new
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* connection, but changing the LAC within the same connection
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* is shifty. Rather cancel everything. */
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return -1;
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}
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if (conn) {
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/* Make sure we don't receive RR over IuCS; otherwise all
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* messages handled by gsm0408_dispatch() are of interest (CC,
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* MM, SMS, NS_SS, maybe even MM_GPRS and SM_GPRS). */
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struct gsm48_hdr *gh = msgb_l3(msg);
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uint8_t pdisc = gh->proto_discr & 0x0f;
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OSMO_ASSERT(pdisc != GSM48_PDISC_RR);
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msc_dtap(conn, ue_ctx->conn_id, msg);
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rc = 0;
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} else {
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/* allocate a new connection */
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if (!lac) {
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LOGP(DIUCS, LOGL_ERROR, "New IuCS subscriber"
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" but no LAC available. Expecting an InitialUE"
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" message containing a LAI IE."
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" Dropping connection.\n");
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return -1;
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}
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conn = subscr_conn_allocate_iu(network, ue_ctx, *lac);
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if (!conn)
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abort();
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/* ownership of conn hereby goes to the MSC: */
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rc = msc_compl_l3(conn, msg, 0);
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}
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return rc;
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}
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int iu_rab_act_cs(struct gsm_trans *trans)
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{
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struct gsm_subscriber_connection *conn;
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struct msgb *msg;
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bool use_x213_nsap;
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uint32_t conn_id;
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struct ranap_ue_conn_ctx *uectx;
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uint8_t rab_id;
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uint32_t rtp_ip;
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uint16_t rtp_port;
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conn = trans->conn;
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uectx = conn->iu.ue_ctx;
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rab_id = conn->iu.rab_id;
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rtp_ip = osmo_htonl(inet_addr(conn->rtp.local_addr_ran));
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rtp_port = conn->rtp.local_port_ran;
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conn_id = uectx->conn_id;
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if (rtp_ip == INADDR_NONE) {
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LOGP(DIUCS, LOGL_DEBUG,
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"Assigning RAB: conn_id=%u, rab_id=%d, invalid RTP IP-Address\n",
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conn_id, rab_id);
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return -EINVAL;
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}
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if (rtp_port == 0) {
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LOGP(DIUCS, LOGL_DEBUG,
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"Assigning RAB: conn_id=%u, rab_id=%d, invalid RTP Port\n",
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conn_id, rab_id);
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return -EINVAL;
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}
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use_x213_nsap =
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(uectx->rab_assign_addr_enc == RANAP_NSAP_ADDR_ENC_X213);
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LOGP(DIUCS, LOGL_DEBUG,
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"Assigning RAB: conn_id=%u, rab_id=%d, rtp=%x:%u, use_x213_nsap=%d\n",
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conn_id, rab_id, rtp_ip, rtp_port, use_x213_nsap);
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msg = ranap_new_msg_rab_assign_voice(rab_id, rtp_ip, rtp_port,
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use_x213_nsap);
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msg->l2h = msg->data;
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if (ranap_iu_rab_act(uectx, msg))
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LOGP(DIUCS, LOGL_ERROR,
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"Failed to send RAB Assignment: conn_id=%d rab_id=%d rtp=%x:%u\n",
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conn_id, rab_id, rtp_ip, rtp_port);
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return 0;
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}
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uint32_t iu_get_conn_id(const struct ranap_ue_conn_ctx *ue)
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{
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return ue->conn_id;
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}
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