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@ -1,771 +0,0 @@
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/* Common parts of IuCS and IuPS interfaces implementation */
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/* (C) 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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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 <stdint.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdbool.h>
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#include <osmocom/core/select.h>
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#include <osmocom/core/prim.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/core/application.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/vty/logging.h>
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#include <osmocom/gsm/gsm48.h>
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#include <osmocom/gprs/gprs_msgb.h>
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#include <osmocom/sigtran/osmo_ss7.h>
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#include <osmocom/sigtran/sccp_sap.h>
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#include <osmocom/sigtran/sccp_helpers.h>
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#include <osmocom/sigtran/protocol/m3ua.h>
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#include <openbsc/gprs_sgsn.h>
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#include <openbsc/iu.h>
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#include <openbsc/debug.h>
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#include <pdp.h>
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#include <osmocom/ranap/ranap_ies_defs.h>
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#include <osmocom/ranap/ranap_common.h>
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#include <osmocom/ranap/ranap_common_cn.h>
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#include <osmocom/ranap/ranap_msg_factory.h>
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#include <asn1c/asn1helpers.h>
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/* Parsed global RNC id. See also struct RANAP_GlobalRNC_ID, and note that the
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* PLMN identity is a BCD representation of the MCC and MNC.
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* See iu_grnc_id_parse(). */
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struct iu_grnc_id {
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uint16_t mcc;
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uint16_t mnc;
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uint16_t rnc_id;
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};
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/* A remote RNC (Radio Network Controller, like BSC but for UMTS) that has
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* called us and is currently reachable at the given osmo_sccp_addr. So, when we
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* know a LAC for a subscriber, we can page it at the RNC matching that LAC or
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* RAC. An HNB-GW typically presents itself as if it were a single RNC, even
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* though it may have several RNCs in hNodeBs connected to it. Those will then
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* share the same RNC id, which they actually receive and adopt from the HNB-GW
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* in the HNBAP HNB REGISTER ACCEPT message. */
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struct iu_rnc {
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struct llist_head entry;
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uint16_t rnc_id;
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uint16_t lac; /* Location Area Code (used for CS and PS) */
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uint8_t rac; /* Routing Area Code (used for PS only) */
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struct osmo_sccp_addr sccp_addr;
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};
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void *talloc_iu_ctx;
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/* Implement the extern asn_debug from libasn1c to indicate whether to print
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* asn.1 debug messages (see libasn1c). */
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int asn_debug = 0;
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/* Implement the extern asn1_xer_print to indicate whether the ASN.1 binary
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* code decoded and encoded during Iu communication should be logged to stderr
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* (see asn.1 generated code in osmo-iuh). */
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int asn1_xer_print = 0;
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void *talloc_asn1_ctx;
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iu_recv_cb_t global_iu_recv_cb = NULL;
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iu_event_cb_t global_iu_event_cb = NULL;
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static LLIST_HEAD(ue_conn_ctx_list);
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static LLIST_HEAD(rnc_list);
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static struct osmo_sccp_instance *g_sccp;
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static struct osmo_sccp_user *g_scu;
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const struct value_string iu_event_type_names[] = {
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OSMO_VALUE_STRING(IU_EVENT_RAB_ASSIGN),
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OSMO_VALUE_STRING(IU_EVENT_SECURITY_MODE_COMPLETE),
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OSMO_VALUE_STRING(IU_EVENT_IU_RELEASE),
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OSMO_VALUE_STRING(IU_EVENT_LINK_INVALIDATED),
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{ 0, NULL }
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};
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struct ue_conn_ctx *ue_conn_ctx_alloc(struct osmo_sccp_addr *addr, uint32_t conn_id)
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{
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struct ue_conn_ctx *ctx = talloc_zero(talloc_iu_ctx, struct ue_conn_ctx);
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ctx->sccp_addr = *addr;
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ctx->conn_id = conn_id;
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llist_add(&ctx->list, &ue_conn_ctx_list);
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return ctx;
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}
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struct ue_conn_ctx *ue_conn_ctx_find(uint32_t conn_id)
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{
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struct ue_conn_ctx *ctx;
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llist_for_each_entry(ctx, &ue_conn_ctx_list, list) {
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if (ctx->conn_id == conn_id)
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return ctx;
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}
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return NULL;
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}
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static struct iu_rnc *iu_rnc_alloc(uint16_t rnc_id, uint16_t lac, uint8_t rac,
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struct osmo_sccp_addr *addr)
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{
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struct iu_rnc *rnc = talloc_zero(talloc_iu_ctx, struct iu_rnc);
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rnc->rnc_id = rnc_id;
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rnc->lac = lac;
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rnc->rac = rac;
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rnc->sccp_addr = *addr;
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llist_add(&rnc->entry, &rnc_list);
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LOGP(DRANAP, LOGL_NOTICE, "New RNC %d (LAC=%d RAC=%d)\n",
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rnc->rnc_id, rnc->lac, rnc->rac);
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return rnc;
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}
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static struct iu_rnc *iu_rnc_register(uint16_t rnc_id, uint16_t lac,
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uint8_t rac, struct osmo_sccp_addr *addr)
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{
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struct iu_rnc *rnc;
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llist_for_each_entry(rnc, &rnc_list, entry) {
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if (rnc->rnc_id != rnc_id)
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continue;
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/* We have this RNC Id registered already. Make sure that the
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* details match. */
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/* TODO should a mismatch be an error? */
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if (rnc->lac != lac || rnc->rac != rac)
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LOGP(DRANAP, LOGL_NOTICE, "RNC %d changes its details:"
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" LAC=%d RAC=%d --> LAC=%d RAC=%d\n",
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rnc->rnc_id, rnc->lac, rnc->rac,
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lac, rac);
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rnc->lac = lac;
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rnc->rac = rac;
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if (addr && memcmp(&rnc->sccp_addr, addr, sizeof(*addr)))
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LOGP(DRANAP, LOGL_NOTICE, "RNC %d on New SCCP Addr %s"
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" (LAC=%d RAC=%d)\n",
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rnc->rnc_id, osmo_sccp_addr_dump(addr), rnc->lac, rnc->rac);
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rnc->sccp_addr = *addr;
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return rnc;
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}
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/* Not found, make a new one. */
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return iu_rnc_alloc(rnc_id, lac, rac, addr);
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}
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/***********************************************************************
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* RANAP handling
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***********************************************************************/
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int iu_rab_act(struct ue_conn_ctx *ue_ctx, struct msgb *msg)
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{
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struct osmo_scu_prim *prim;
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/* wrap RANAP message in SCCP N-DATA.req */
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prim = (struct osmo_scu_prim *) msgb_push(msg, sizeof(*prim));
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prim->u.data.conn_id = ue_ctx->conn_id;
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osmo_prim_init(&prim->oph,
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SCCP_SAP_USER,
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OSMO_SCU_PRIM_N_DATA,
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PRIM_OP_REQUEST,
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msg);
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return osmo_sccp_user_sap_down(g_scu, &prim->oph);
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}
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int iu_rab_deact(struct ue_conn_ctx *ue_ctx, uint8_t rab_id)
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{
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/* FIXME */
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return -1;
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}
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int iu_tx_sec_mode_cmd(struct ue_conn_ctx *uectx, struct gsm_auth_tuple *tp,
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int send_ck, int new_key)
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{
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struct osmo_scu_prim *prim;
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struct msgb *msg;
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/* create RANAP message */
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msg = ranap_new_msg_sec_mod_cmd(tp->vec.ik, send_ck? tp->vec.ck : NULL,
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new_key ? RANAP_KeyStatus_new : RANAP_KeyStatus_old);
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msg->l2h = msg->data;
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/* wrap RANAP message in SCCP N-DATA.req */
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prim = (struct osmo_scu_prim *) msgb_push(msg, sizeof(*prim));
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prim->u.data.conn_id = uectx->conn_id;
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osmo_prim_init(&prim->oph, SCCP_SAP_USER,
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OSMO_SCU_PRIM_N_DATA,
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PRIM_OP_REQUEST, msg);
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osmo_sccp_user_sap_down(g_scu, &prim->oph);
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return 0;
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}
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int iu_tx_common_id(struct ue_conn_ctx *uectx, const char *imsi)
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{
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struct msgb *msg;
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struct osmo_scu_prim *prim;
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LOGP(DRANAP, LOGL_INFO, "Transmitting RANAP CommonID (SCCP conn_id %u)\n",
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uectx->conn_id);
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msg = ranap_new_msg_common_id(imsi);
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msg->l2h = msg->data;
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prim = (struct osmo_scu_prim *) msgb_push(msg, sizeof(*prim));
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prim->u.data.conn_id = uectx->conn_id;
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osmo_prim_init(&prim->oph, SCCP_SAP_USER,
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OSMO_SCU_PRIM_N_DATA,
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PRIM_OP_REQUEST, msg);
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osmo_sccp_user_sap_down(g_scu, &prim->oph);
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return 0;
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}
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static int iu_grnc_id_parse(struct iu_grnc_id *dst,
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struct RANAP_GlobalRNC_ID *src)
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{
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/* The size is coming from arbitrary sender, check it gracefully */
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if (src->pLMNidentity.size != 3) {
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LOGP(DRANAP, LOGL_ERROR, "Invalid PLMN Identity size:"
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" should be 3, is %d\n", src->pLMNidentity.size);
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return -1;
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}
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gsm48_mcc_mnc_from_bcd(&src->pLMNidentity.buf[0],
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&dst->mcc, &dst->mnc);
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dst->rnc_id = (uint16_t)src->rNC_ID;
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return 0;
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}
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#if 0
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-- not used at present --
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static int iu_grnc_id_compose(struct iu_grnc_id *src,
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struct RANAP_GlobalRNC_ID *dst)
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{
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/* The caller must ensure proper size */
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OSMO_ASSERT(dst->pLMNidentity.size == 3);
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gsm48_mcc_mnc_to_bcd(&dst->pLMNidentity.buf[0],
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src->mcc, src->mnc);
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dst->rNC_ID = src->rnc_id;
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return 0;
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}
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#endif
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static int ranap_handle_co_initial_ue(void *ctx, RANAP_InitialUE_MessageIEs_t *ies)
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{
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struct ue_conn_ctx *ue_conn = ctx;
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struct gprs_ra_id ra_id;
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struct iu_grnc_id grnc_id;
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uint16_t sai;
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struct msgb *msg = msgb_alloc(256, "RANAP->NAS");
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if (ranap_parse_lai(&ra_id, &ies->lai) != 0) {
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LOGP(DRANAP, LOGL_ERROR, "Failed to parse RANAP LAI IE\n");
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return -1;
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}
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if (ies->presenceMask & INITIALUE_MESSAGEIES_RANAP_RAC_PRESENT) {
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ra_id.rac = asn1str_to_u8(&ies->rac);
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}
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if (iu_grnc_id_parse(&grnc_id, &ies->globalRNC_ID) != 0) {
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LOGP(DRANAP, LOGL_ERROR,
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"Failed to parse RANAP Global-RNC-ID IE\n");
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return -1;
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}
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|
|
|
sai = asn1str_to_u16(&ies->sai.sAC);
|
|
|
|
|
msgb_gmmh(msg) = msgb_put(msg, ies->nas_pdu.size);
|
|
|
|
|
memcpy(msgb_gmmh(msg), ies->nas_pdu.buf, ies->nas_pdu.size);
|
|
|
|
|
|
|
|
|
|
/* Make sure we know the RNC Id and LAC+RAC coming in on this connection. */
|
|
|
|
|
iu_rnc_register(grnc_id.rnc_id, ra_id.lac, ra_id.rac, &ue_conn->sccp_addr);
|
|
|
|
|
ue_conn->ra_id = ra_id;
|
|
|
|
|
|
|
|
|
|
/* Feed into the MM layer */
|
|
|
|
|
msg->dst = ctx;
|
|
|
|
|
global_iu_recv_cb(msg, &ra_id, &sai);
|
|
|
|
|
|
|
|
|
|
msgb_free(msg);
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int ranap_handle_co_dt(void *ctx, RANAP_DirectTransferIEs_t *ies)
|
|
|
|
|
{
|
|
|
|
|
struct gprs_ra_id _ra_id, *ra_id = NULL;
|
|
|
|
|
uint16_t _sai, *sai = NULL;
|
|
|
|
|
struct msgb *msg = msgb_alloc(256, "RANAP->NAS");
|
|
|
|
|
|
|
|
|
|
if (ies->presenceMask & DIRECTTRANSFERIES_RANAP_LAI_PRESENT) {
|
|
|
|
|
if (ranap_parse_lai(&_ra_id, &ies->lai) != 0) {
|
|
|
|
|
LOGP(DRANAP, LOGL_ERROR, "Failed to parse RANAP LAI IE\n");
|
|
|
|
|
return -1;
|
|
|
|
|
}
|
|
|
|
|
ra_id = &_ra_id;
|
|
|
|
|
if (ies->presenceMask & DIRECTTRANSFERIES_RANAP_RAC_PRESENT) {
|
|
|
|
|
_ra_id.rac = asn1str_to_u8(&ies->rac);
|
|
|
|
|
}
|
|
|
|
|
if (ies->presenceMask & DIRECTTRANSFERIES_RANAP_SAI_PRESENT) {
|
|
|
|
|
_sai = asn1str_to_u16(&ies->sai.sAC);
|
|
|
|
|
sai = &_sai;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
msgb_gmmh(msg) = msgb_put(msg, ies->nas_pdu.size);
|
|
|
|
|
memcpy(msgb_gmmh(msg), ies->nas_pdu.buf, ies->nas_pdu.size);
|
|
|
|
|
|
|
|
|
|
/* Feed into the MM/CC/SMS-CP layer */
|
|
|
|
|
msg->dst = ctx;
|
|
|
|
|
global_iu_recv_cb(msg, ra_id, sai);
|
|
|
|
|
|
|
|
|
|
msgb_free(msg);
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int ranap_handle_co_err_ind(void *ctx, RANAP_ErrorIndicationIEs_t *ies)
|
|
|
|
|
{
|
|
|
|
|
if (ies->presenceMask & ERRORINDICATIONIES_RANAP_CAUSE_PRESENT)
|
|
|
|
|
LOGP(DRANAP, LOGL_ERROR, "Rx Error Indication (%s)\n",
|
|
|
|
|
ranap_cause_str(&ies->cause));
|
|
|
|
|
else
|
|
|
|
|
LOGP(DRANAP, LOGL_ERROR, "Rx Error Indication\n");
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int iu_tx(struct msgb *msg_nas, uint8_t sapi)
|
|
|
|
|
{
|
|
|
|
|
struct ue_conn_ctx *uectx = msg_nas->dst;
|
|
|
|
|
struct msgb *msg;
|
|
|
|
|
struct osmo_scu_prim *prim;
|
|
|
|
|
|
|
|
|
|
LOGP(DRANAP, LOGL_INFO, "Transmitting L3 Message as RANAP DT (SCCP conn_id %u)\n",
|
|
|
|
|
uectx->conn_id);
|
|
|
|
|
|
|
|
|
|
msg = ranap_new_msg_dt(sapi, msg_nas->data, msgb_length(msg_nas));
|
|
|
|
|
msgb_free(msg_nas);
|
|
|
|
|
msg->l2h = msg->data;
|
|
|
|
|
prim = (struct osmo_scu_prim *) msgb_push(msg, sizeof(*prim));
|
|
|
|
|
prim->u.data.conn_id = uectx->conn_id;
|
|
|
|
|
osmo_prim_init(&prim->oph, SCCP_SAP_USER,
|
|
|
|
|
OSMO_SCU_PRIM_N_DATA,
|
|
|
|
|
PRIM_OP_REQUEST, msg);
|
|
|
|
|
osmo_sccp_user_sap_down(g_scu, &prim->oph);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Send Iu Release for the given UE connection.
|
|
|
|
|
* If cause is NULL, the standard "No remaining RAB" cause is sent, otherwise
|
|
|
|
|
* the provided cause. */
|
|
|
|
|
int iu_tx_release(struct ue_conn_ctx *ctx, const struct RANAP_Cause *cause)
|
|
|
|
|
{
|
|
|
|
|
struct msgb *msg;
|
|
|
|
|
struct osmo_scu_prim *prim;
|
|
|
|
|
static const struct RANAP_Cause default_cause = {
|
|
|
|
|
.present = RANAP_Cause_PR_radioNetwork,
|
|
|
|
|
.choice.radioNetwork = RANAP_CauseRadioNetwork_no_remaining_rab,
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
if (!cause)
|
|
|
|
|
cause = &default_cause;
|
|
|
|
|
|
|
|
|
|
LOGP(DRANAP, LOGL_INFO, "Transmitting Iu Release (SCCP conn_id %u)\n",
|
|
|
|
|
ctx->conn_id);
|
|
|
|
|
|
|
|
|
|
msg = ranap_new_msg_iu_rel_cmd(cause);
|
|
|
|
|
msg->l2h = msg->data;
|
|
|
|
|
prim = (struct osmo_scu_prim *) msgb_push(msg, sizeof(*prim));
|
|
|
|
|
prim->u.data.conn_id = ctx->conn_id;
|
|
|
|
|
osmo_prim_init(&prim->oph, SCCP_SAP_USER,
|
|
|
|
|
OSMO_SCU_PRIM_N_DATA,
|
|
|
|
|
PRIM_OP_REQUEST, msg);
|
|
|
|
|
return osmo_sccp_user_sap_down(g_scu, &prim->oph);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int ranap_handle_co_iu_rel_req(struct ue_conn_ctx *ctx, RANAP_Iu_ReleaseRequestIEs_t *ies)
|
|
|
|
|
{
|
|
|
|
|
LOGP(DRANAP, LOGL_INFO, "Received Iu Release Request, Sending Release Command\n");
|
|
|
|
|
iu_tx_release(ctx, &ies->cause);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int ranap_handle_co_rab_ass_resp(struct ue_conn_ctx *ctx, RANAP_RAB_AssignmentResponseIEs_t *ies)
|
|
|
|
|
{
|
|
|
|
|
int rc = -1;
|
|
|
|
|
|
|
|
|
|
LOGP(DRANAP, LOGL_INFO,
|
|
|
|
|
"Rx RAB Assignment Response for UE conn_id %u\n", ctx->conn_id);
|
|
|
|
|
if (ies->presenceMask & RAB_ASSIGNMENTRESPONSEIES_RANAP_RAB_SETUPORMODIFIEDLIST_PRESENT) {
|
|
|
|
|
/* TODO: Iterate over list of SetupOrModifiedList IEs and handle each one */
|
|
|
|
|
RANAP_IE_t *ranap_ie = ies->raB_SetupOrModifiedList.raB_SetupOrModifiedList_ies.list.array[0];
|
|
|
|
|
RANAP_RAB_SetupOrModifiedItemIEs_t setup_ies;
|
|
|
|
|
|
|
|
|
|
rc = ranap_decode_rab_setupormodifieditemies_fromlist(&setup_ies, &ranap_ie->value);
|
|
|
|
|
if (rc) {
|
|
|
|
|
LOGP(DRANAP, LOGL_ERROR, "Error in ranap_decode_rab_setupormodifieditemies()\n");
|
|
|
|
|
return rc;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
rc = global_iu_event_cb(ctx, IU_EVENT_RAB_ASSIGN, &setup_ies);
|
|
|
|
|
|
|
|
|
|
ranap_free_rab_setupormodifieditemies(&setup_ies);
|
|
|
|
|
}
|
|
|
|
|
/* FIXME: handle RAB Ass failure? */
|
|
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Entry point for connection-oriented RANAP message */
|
|
|
|
|
static void cn_ranap_handle_co(void *ctx, ranap_message *message)
|
|
|
|
|
{
|
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
|
|
LOGP(DRANAP, LOGL_NOTICE, "handle_co(dir=%u, proc=%u)\n", message->direction, message->procedureCode);
|
|
|
|
|
|
|
|
|
|
switch (message->direction) {
|
|
|
|
|
case RANAP_RANAP_PDU_PR_initiatingMessage:
|
|
|
|
|
switch (message->procedureCode) {
|
|
|
|
|
case RANAP_ProcedureCode_id_InitialUE_Message:
|
|
|
|
|
rc = ranap_handle_co_initial_ue(ctx, &message->msg.initialUE_MessageIEs);
|
|
|
|
|
break;
|
|
|
|
|
case RANAP_ProcedureCode_id_DirectTransfer:
|
|
|
|
|
rc = ranap_handle_co_dt(ctx, &message->msg.directTransferIEs);
|
|
|
|
|
break;
|
|
|
|
|
case RANAP_ProcedureCode_id_ErrorIndication:
|
|
|
|
|
rc = ranap_handle_co_err_ind(ctx, &message->msg.errorIndicationIEs);
|
|
|
|
|
break;
|
|
|
|
|
case RANAP_ProcedureCode_id_Iu_ReleaseRequest:
|
|
|
|
|
/* Iu Release Request */
|
|
|
|
|
rc = ranap_handle_co_iu_rel_req(ctx, &message->msg.iu_ReleaseRequestIEs);
|
|
|
|
|
break;
|
|
|
|
|
default:
|
|
|
|
|
LOGP(DRANAP, LOGL_ERROR, "Received Initiating Message: unknown Procedure Code %d\n",
|
|
|
|
|
message->procedureCode);
|
|
|
|
|
rc = -1;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
break;
|
|
|
|
|
case RANAP_RANAP_PDU_PR_successfulOutcome:
|
|
|
|
|
switch (message->procedureCode) {
|
|
|
|
|
case RANAP_ProcedureCode_id_SecurityModeControl:
|
|
|
|
|
/* Security Mode Complete */
|
|
|
|
|
rc = global_iu_event_cb(ctx, IU_EVENT_SECURITY_MODE_COMPLETE, NULL);
|
|
|
|
|
break;
|
|
|
|
|
case RANAP_ProcedureCode_id_Iu_Release:
|
|
|
|
|
/* Iu Release Complete */
|
|
|
|
|
rc = global_iu_event_cb(ctx, IU_EVENT_IU_RELEASE, NULL);
|
|
|
|
|
if (rc) {
|
|
|
|
|
LOGP(DRANAP, LOGL_ERROR, "Iu Release event: Iu Event callback returned %d\n",
|
|
|
|
|
rc);
|
|
|
|
|
}
|
|
|
|
|
break;
|
|
|
|
|
default:
|
|
|
|
|
LOGP(DRANAP, LOGL_ERROR, "Received Successful Outcome: unknown Procedure Code %d\n",
|
|
|
|
|
message->procedureCode);
|
|
|
|
|
rc = -1;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
break;
|
|
|
|
|
case RANAP_RANAP_PDU_PR_outcome:
|
|
|
|
|
switch (message->procedureCode) {
|
|
|
|
|
case RANAP_ProcedureCode_id_RAB_Assignment:
|
|
|
|
|
/* RAB Assignment Response */
|
|
|
|
|
rc = ranap_handle_co_rab_ass_resp(ctx, &message->msg.raB_AssignmentResponseIEs);
|
|
|
|
|
break;
|
|
|
|
|
default:
|
|
|
|
|
LOGP(DRANAP, LOGL_ERROR, "Received Outcome: unknown Procedure Code %d\n",
|
|
|
|
|
message->procedureCode);
|
|
|
|
|
rc = -1;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
break;
|
|
|
|
|
case RANAP_RANAP_PDU_PR_unsuccessfulOutcome:
|
|
|
|
|
default:
|
|
|
|
|
LOGP(DRANAP, LOGL_ERROR, "Received Unsuccessful Outcome: Procedure Code %d\n",
|
|
|
|
|
message->procedureCode);
|
|
|
|
|
rc = -1;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (rc) {
|
|
|
|
|
LOGP(DRANAP, LOGL_ERROR, "Error in cn_ranap_handle_co (%d)\n",
|
|
|
|
|
rc);
|
|
|
|
|
/* TODO handling of the error? */
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int ranap_handle_cl_reset_req(void *ctx, RANAP_ResetIEs_t *ies)
|
|
|
|
|
{
|
|
|
|
|
/* FIXME: send reset response */
|
|
|
|
|
return -1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int ranap_handle_cl_err_ind(void *ctx, RANAP_ErrorIndicationIEs_t *ies)
|
|
|
|
|
{
|
|
|
|
|
if (ies->presenceMask & ERRORINDICATIONIES_RANAP_CAUSE_PRESENT)
|
|
|
|
|
LOGP(DRANAP, LOGL_ERROR, "Rx Error Indication (%s)\n",
|
|
|
|
|
ranap_cause_str(&ies->cause));
|
|
|
|
|
else
|
|
|
|
|
LOGP(DRANAP, LOGL_ERROR, "Rx Error Indication\n");
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Entry point for connection-less RANAP message */
|
|
|
|
|
static void cn_ranap_handle_cl(void *ctx, ranap_message *message)
|
|
|
|
|
{
|
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
|
|
switch (message->direction) {
|
|
|
|
|
case RANAP_RANAP_PDU_PR_initiatingMessage:
|
|
|
|
|
switch (message->procedureCode) {
|
|
|
|
|
case RANAP_ProcedureCode_id_Reset:
|
|
|
|
|
/* received reset.req, send reset.resp */
|
|
|
|
|
rc = ranap_handle_cl_reset_req(ctx, &message->msg.resetIEs);
|
|
|
|
|
break;
|
|
|
|
|
case RANAP_ProcedureCode_id_ErrorIndication:
|
|
|
|
|
rc = ranap_handle_cl_err_ind(ctx, &message->msg.errorIndicationIEs);
|
|
|
|
|
break;
|
|
|
|
|
default:
|
|
|
|
|
rc = -1;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
break;
|
|
|
|
|
case RANAP_RANAP_PDU_PR_successfulOutcome:
|
|
|
|
|
case RANAP_RANAP_PDU_PR_unsuccessfulOutcome:
|
|
|
|
|
case RANAP_RANAP_PDU_PR_outcome:
|
|
|
|
|
default:
|
|
|
|
|
rc = -1;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (rc) {
|
|
|
|
|
LOGP(DRANAP, LOGL_ERROR, "Error in cn_ranap_handle_cl (%d)\n",
|
|
|
|
|
rc);
|
|
|
|
|
/* TODO handling of the error? */
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/***********************************************************************
|
|
|
|
|
* Paging
|
|
|
|
|
***********************************************************************/
|
|
|
|
|
|
|
|
|
|
struct osmo_sccp_addr local_sccp_addr = {
|
|
|
|
|
.presence = OSMO_SCCP_ADDR_T_SSN | OSMO_SCCP_ADDR_T_PC,
|
|
|
|
|
.ri = OSMO_SCCP_RI_SSN_PC,
|
|
|
|
|
.ssn = OSMO_SCCP_SSN_RANAP,
|
|
|
|
|
.pc = 1,
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
/* Send a paging command down a given SCCP User. tmsi and paging_cause are
|
|
|
|
|
* optional and may be passed NULL and 0, respectively, to disable their use.
|
|
|
|
|
* See enum RANAP_PagingCause.
|
|
|
|
|
*
|
|
|
|
|
* If TMSI is given, the IMSI is not sent over the air interface. Nevertheless,
|
|
|
|
|
* the IMSI is still required for resolution in the HNB-GW and/or(?) RNC. */
|
|
|
|
|
static int iu_tx_paging_cmd(struct osmo_sccp_addr *called_addr,
|
|
|
|
|
const char *imsi, const uint32_t *tmsi,
|
|
|
|
|
bool is_ps, uint32_t paging_cause)
|
|
|
|
|
{
|
|
|
|
|
struct msgb *msg;
|
|
|
|
|
msg = ranap_new_msg_paging_cmd(imsi, tmsi, is_ps? 1 : 0, paging_cause);
|
|
|
|
|
msg->l2h = msg->data;
|
|
|
|
|
osmo_sccp_tx_unitdata_msg(g_scu, &local_sccp_addr, called_addr, msg);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int iu_page(const char *imsi, const uint32_t *tmsi_or_ptimsi,
|
|
|
|
|
uint16_t lac, uint8_t rac, bool is_ps)
|
|
|
|
|
{
|
|
|
|
|
struct iu_rnc *rnc;
|
|
|
|
|
int pagings_sent = 0;
|
|
|
|
|
|
|
|
|
|
if (tmsi_or_ptimsi) {
|
|
|
|
|
LOGP(DRANAP, LOGL_DEBUG, "%s: Looking for RNCs to page for IMSI %s"
|
|
|
|
|
" (paging will use %s %x)\n",
|
|
|
|
|
is_ps? "IuPS" : "IuCS",
|
|
|
|
|
imsi,
|
|
|
|
|
is_ps? "PTMSI" : "TMSI",
|
|
|
|
|
*tmsi_or_ptimsi);
|
|
|
|
|
} else {
|
|
|
|
|
LOGP(DRANAP, LOGL_DEBUG, "%s: Looking for RNCs to page for IMSI %s"
|
|
|
|
|
" (paging will use IMSI)\n",
|
|
|
|
|
is_ps? "IuPS" : "IuCS",
|
|
|
|
|
imsi
|
|
|
|
|
);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
llist_for_each_entry(rnc, &rnc_list, entry) {
|
|
|
|
|
if (rnc->lac != lac)
|
|
|
|
|
continue;
|
|
|
|
|
if (is_ps && rnc->rac != rac)
|
|
|
|
|
continue;
|
|
|
|
|
|
|
|
|
|
/* Found a match! */
|
|
|
|
|
if (iu_tx_paging_cmd(&rnc->sccp_addr, imsi, tmsi_or_ptimsi, is_ps, 0)
|
|
|
|
|
== 0) {
|
|
|
|
|
LOGP(DRANAP, LOGL_DEBUG,
|
|
|
|
|
"%s: Paged for IMSI %s on RNC %d, on SCCP addr %s\n",
|
|
|
|
|
is_ps? "IuPS" : "IuCS",
|
|
|
|
|
imsi, rnc->rnc_id, osmo_sccp_addr_dump(&rnc->sccp_addr));
|
|
|
|
|
pagings_sent ++;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Some logging... */
|
|
|
|
|
if (pagings_sent > 0) {
|
|
|
|
|
LOGP(DRANAP, LOGL_DEBUG,
|
|
|
|
|
"%s: %d RNCs were paged for IMSI %s.\n",
|
|
|
|
|
is_ps? "IuPS" : "IuCS",
|
|
|
|
|
pagings_sent, imsi);
|
|
|
|
|
}
|
|
|
|
|
else {
|
|
|
|
|
if (is_ps) {
|
|
|
|
|
LOGP(DRANAP, LOGL_ERROR, "IuPS: Found no RNC to page for"
|
|
|
|
|
" LAC %d RAC %d (would have paged IMSI %s)\n",
|
|
|
|
|
lac, rac, imsi);
|
|
|
|
|
}
|
|
|
|
|
else {
|
|
|
|
|
LOGP(DRANAP, LOGL_ERROR, "IuCS: Found no RNC to page for"
|
|
|
|
|
" LAC %d (would have paged IMSI %s)\n",
|
|
|
|
|
lac, imsi);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return pagings_sent;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int iu_page_cs(const char *imsi, const uint32_t *tmsi, uint16_t lac)
|
|
|
|
|
{
|
|
|
|
|
return iu_page(imsi, tmsi, lac, 0, false);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int iu_page_ps(const char *imsi, const uint32_t *ptmsi, uint16_t lac, uint8_t rac)
|
|
|
|
|
{
|
|
|
|
|
return iu_page(imsi, ptmsi, lac, rac, true);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/***********************************************************************
|
|
|
|
|
*
|
|
|
|
|
***********************************************************************/
|
|
|
|
|
|
|
|
|
|
int tx_unitdata(struct osmo_sccp_user *scu);
|
|
|
|
|
int tx_conn_req(struct osmo_sccp_user *scu, uint32_t conn_id);
|
|
|
|
|
|
|
|
|
|
struct osmo_prim_hdr *make_conn_req(uint32_t conn_id);
|
|
|
|
|
struct osmo_prim_hdr *make_dt1_req(uint32_t conn_id, const uint8_t *data, unsigned int len);
|
|
|
|
|
|
|
|
|
|
struct osmo_prim_hdr *make_conn_resp(struct osmo_scu_connect_param *param)
|
|
|
|
|
{
|
|
|
|
|
struct msgb *msg = msgb_alloc(1024, "conn_resp");
|
|
|
|
|
struct osmo_scu_prim *prim;
|
|
|
|
|
|
|
|
|
|
prim = (struct osmo_scu_prim *) msgb_put(msg, sizeof(*prim));
|
|
|
|
|
osmo_prim_init(&prim->oph, SCCP_SAP_USER,
|
|
|
|
|
OSMO_SCU_PRIM_N_CONNECT,
|
|
|
|
|
PRIM_OP_RESPONSE, msg);
|
|
|
|
|
memcpy(&prim->u.connect, param, sizeof(prim->u.connect));
|
|
|
|
|
return &prim->oph;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int sccp_sap_up(struct osmo_prim_hdr *oph, void *_scu)
|
|
|
|
|
{
|
|
|
|
|
struct osmo_sccp_user *scu = _scu;
|
|
|
|
|
struct osmo_scu_prim *prim = (struct osmo_scu_prim *) oph;
|
|
|
|
|
struct osmo_prim_hdr *resp = NULL;
|
|
|
|
|
int rc;
|
|
|
|
|
struct ue_conn_ctx *ue;
|
|
|
|
|
|
|
|
|
|
DEBUGP(DRANAP, "sccp_sap_up(%s)\n", osmo_scu_prim_name(oph));
|
|
|
|
|
|
|
|
|
|
switch (OSMO_PRIM_HDR(oph)) {
|
|
|
|
|
case OSMO_PRIM(OSMO_SCU_PRIM_N_CONNECT, PRIM_OP_CONFIRM):
|
|
|
|
|
/* confirmation of outbound connection */
|
|
|
|
|
rc = -1;
|
|
|
|
|
break;
|
|
|
|
|
case OSMO_PRIM(OSMO_SCU_PRIM_N_CONNECT, PRIM_OP_INDICATION):
|
|
|
|
|
/* indication of new inbound connection request*/
|
|
|
|
|
DEBUGP(DRANAP, "N-CONNECT.ind(X->%u)\n", prim->u.connect.conn_id);
|
|
|
|
|
if (/* prim->u.connect.called_addr.ssn != OSMO_SCCP_SSN_RANAP || */
|
|
|
|
|
!msgb_l2(oph->msg) || msgb_l2len(oph->msg) == 0) {
|
|
|
|
|
LOGP(DRANAP, LOGL_NOTICE,
|
|
|
|
|
"Received invalid N-CONNECT.ind\n");
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
ue = ue_conn_ctx_alloc(&prim->u.connect.calling_addr, prim->u.connect.conn_id);
|
|
|
|
|
/* first ensure the local SCCP socket is ACTIVE */
|
|
|
|
|
resp = make_conn_resp(&prim->u.connect);
|
|
|
|
|
osmo_sccp_user_sap_down(scu, resp);
|
|
|
|
|
/* then handle the RANAP payload */
|
|
|
|
|
rc = ranap_cn_rx_co(cn_ranap_handle_co, ue, msgb_l2(oph->msg), msgb_l2len(oph->msg));
|
|
|
|
|
break;
|
|
|
|
|
case OSMO_PRIM(OSMO_SCU_PRIM_N_DISCONNECT, PRIM_OP_INDICATION):
|
|
|
|
|
/* indication of disconnect */
|
|
|
|
|
DEBUGP(DRANAP, "N-DISCONNECT.ind(%u)\n",
|
|
|
|
|
prim->u.disconnect.conn_id);
|
|
|
|
|
ue = ue_conn_ctx_find(prim->u.disconnect.conn_id);
|
|
|
|
|
rc = ranap_cn_rx_co(cn_ranap_handle_co, ue, msgb_l2(oph->msg), msgb_l2len(oph->msg));
|
|
|
|
|
break;
|
|
|
|
|
case OSMO_PRIM(OSMO_SCU_PRIM_N_DATA, PRIM_OP_INDICATION):
|
|
|
|
|
/* connection-oriented data received */
|
|
|
|
|
DEBUGP(DRANAP, "N-DATA.ind(%u, %s)\n", prim->u.data.conn_id,
|
|
|
|
|
osmo_hexdump(msgb_l2(oph->msg), msgb_l2len(oph->msg)));
|
|
|
|
|
/* resolve UE context */
|
|
|
|
|
ue = ue_conn_ctx_find(prim->u.data.conn_id);
|
|
|
|
|
rc = ranap_cn_rx_co(cn_ranap_handle_co, ue, msgb_l2(oph->msg), msgb_l2len(oph->msg));
|
|
|
|
|
break;
|
|
|
|
|
case OSMO_PRIM(OSMO_SCU_PRIM_N_UNITDATA, PRIM_OP_INDICATION):
|
|
|
|
|
/* connection-less data received */
|
|
|
|
|
DEBUGP(DRANAP, "N-UNITDATA.ind(%s)\n",
|
|
|
|
|
osmo_hexdump(msgb_l2(oph->msg), msgb_l2len(oph->msg)));
|
|
|
|
|
rc = ranap_cn_rx_cl(cn_ranap_handle_cl, scu, msgb_l2(oph->msg), msgb_l2len(oph->msg));
|
|
|
|
|
break;
|
|
|
|
|
default:
|
|
|
|
|
rc = -1;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
msgb_free(oph->msg);
|
|
|
|
|
return rc;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int iu_init(void *ctx, struct osmo_sccp_instance *sccp,
|
|
|
|
|
iu_recv_cb_t iu_recv_cb, iu_event_cb_t iu_event_cb)
|
|
|
|
|
{
|
|
|
|
|
talloc_iu_ctx = talloc_named_const(ctx, 1, "iu");
|
|
|
|
|
talloc_asn1_ctx = talloc_named_const(talloc_iu_ctx, 1, "asn1");
|
|
|
|
|
|
|
|
|
|
global_iu_recv_cb = iu_recv_cb;
|
|
|
|
|
global_iu_event_cb = iu_event_cb;
|
|
|
|
|
g_sccp = sccp;
|
|
|
|
|
g_scu = osmo_sccp_user_bind(g_sccp, "OsmoMSC-Iu", sccp_sap_up, OSMO_SCCP_SSN_RANAP);
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
Neels Hofmeyr
