move libiu to osmo-iuh/libosmo-ranapaoip

Remove libiu here, use the functions from libosmo-ranap instead, by applying
the ranap_ / RANAP_ prefix.

Corresponding change-id in osmo-iuh.git is I6a3f7ad15be03fb94689b4af6ccfa828c25f45c0

Change-Id: Ib8c4fcdb4766c5e575618b95ce16dce51063206b

1 files changed, 0 insertions, 768 deletions

diff --git a/src/libiu/iu.c b/src/libiu/iu.c
deleted file mode 100644
index 1bb530584..000000000
--- a/src/libiu/iu.c
+++ /dev/null
@@ -1,768 +0,0 @@
-/* Common parts of IuCS and IuPS interfaces implementation */
-
-/* (C) 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
- * All Rights Reserved
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as published by
- * the Free Software Foundation; either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- *
- */
-
-#include <stdint.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#include <stdbool.h>
-
-#include <osmocom/core/select.h>
-#include <osmocom/core/prim.h>
-#include <osmocom/core/talloc.h>
-#include <osmocom/core/logging.h>
-#include <osmocom/core/application.h>
-#include <osmocom/core/utils.h>
-#include <osmocom/vty/logging.h>
-
-#include <osmocom/gsm/gsm48.h>
-#include <osmocom/gprs/gprs_msgb.h>
-
-#include <osmocom/sigtran/osmo_ss7.h>
-#include <osmocom/sigtran/sccp_sap.h>
-#include <osmocom/sigtran/sccp_helpers.h>
-#include <osmocom/sigtran/protocol/m3ua.h>
-
-#include <openbsc/gprs_sgsn.h>
-#include <openbsc/iu.h>
-#include <openbsc/debug.h>
-
-#include <pdp.h>
-
-#include <osmocom/ranap/ranap_ies_defs.h>
-#include <osmocom/ranap/ranap_common.h>
-#include <osmocom/ranap/ranap_common_cn.h>
-#include <osmocom/ranap/ranap_msg_factory.h>
-
-#include <asn1c/asn1helpers.h>
-
-/* Parsed global RNC id. See also struct RANAP_GlobalRNC_ID, and note that the
- * PLMN identity is a BCD representation of the MCC and MNC.
- * See iu_grnc_id_parse(). */
-struct iu_grnc_id {
-	uint16_t mcc;
-	uint16_t mnc;
-	uint16_t rnc_id;
-};
-
-/* A remote RNC (Radio Network Controller, like BSC but for UMTS) that has
- * called us and is currently reachable at the given osmo_sccp_addr. So, when we
- * know a LAC for a subscriber, we can page it at the RNC matching that LAC or
- * RAC. An HNB-GW typically presents itself as if it were a single RNC, even
- * though it may have several RNCs in hNodeBs connected to it. Those will then
- * share the same RNC id, which they actually receive and adopt from the HNB-GW
- * in the HNBAP HNB REGISTER ACCEPT message. */
-struct iu_rnc {
-	struct llist_head entry;
-
-	uint16_t rnc_id;
-	uint16_t lac; /* Location Area Code (used for CS and PS) */
-	uint8_t rac; /* Routing Area Code (used for PS only) */
-	struct osmo_sccp_addr sccp_addr;
-};
-
-void *talloc_iu_ctx;
-
-/* Implement the extern asn_debug from libasn1c to indicate whether to print
- * asn.1 debug messages (see libasn1c). */
-int asn_debug = 0;
-
-/* Implement the extern asn1_xer_print to indicate whether the ASN.1 binary
- * code decoded and encoded during Iu communication should be logged to stderr
- * (see asn.1 generated code in osmo-iuh). */
-int asn1_xer_print = 0;
-
-void *talloc_asn1_ctx;
-
-iu_recv_cb_t global_iu_recv_cb = NULL;
-iu_event_cb_t global_iu_event_cb = NULL;
-
-static LLIST_HEAD(ue_conn_ctx_list);
-static LLIST_HEAD(rnc_list);
-
-static struct osmo_sccp_instance *g_sccp;
-static struct osmo_sccp_user *g_scu;
-
-const struct value_string iu_event_type_names[] = {
-	OSMO_VALUE_STRING(IU_EVENT_RAB_ASSIGN),
-	OSMO_VALUE_STRING(IU_EVENT_SECURITY_MODE_COMPLETE),
-	OSMO_VALUE_STRING(IU_EVENT_IU_RELEASE),
-	OSMO_VALUE_STRING(IU_EVENT_LINK_INVALIDATED),
-	{ 0, NULL }
-};
-
-struct ue_conn_ctx *ue_conn_ctx_alloc(struct osmo_sccp_addr *addr, uint32_t conn_id)
-{
-	struct ue_conn_ctx *ctx = talloc_zero(talloc_iu_ctx, struct ue_conn_ctx);
-
-	ctx->sccp_addr = *addr;
-	ctx->conn_id = conn_id;
-	llist_add(&ctx->list, &ue_conn_ctx_list);
-
-	return ctx;
-}
-
-struct ue_conn_ctx *ue_conn_ctx_find(uint32_t conn_id)
-{
-	struct ue_conn_ctx *ctx;
-
-	llist_for_each_entry(ctx, &ue_conn_ctx_list, list) {
-		if (ctx->conn_id == conn_id)
-			return ctx;
-	}
-	return NULL;
-}
-
-static struct iu_rnc *iu_rnc_alloc(uint16_t rnc_id, uint16_t lac, uint8_t rac,
-				   struct osmo_sccp_addr *addr)
-{
-	struct iu_rnc *rnc = talloc_zero(talloc_iu_ctx, struct iu_rnc);
-
-	rnc->rnc_id = rnc_id;
-	rnc->lac = lac;
-	rnc->rac = rac;
-	rnc->sccp_addr = *addr;
-	llist_add(&rnc->entry, &rnc_list);
-
-	LOGP(DRANAP, LOGL_NOTICE, "New RNC %d (LAC=%d RAC=%d)\n",
-	     rnc->rnc_id, rnc->lac, rnc->rac);
-
-	return rnc;
-}
-
-static struct iu_rnc *iu_rnc_register(uint16_t rnc_id, uint16_t lac,
-				      uint8_t rac, struct osmo_sccp_addr *addr)
-{
-	struct iu_rnc *rnc;
-	llist_for_each_entry(rnc, &rnc_list, entry) {
-		if (rnc->rnc_id != rnc_id)
-			continue;
-
-		/* We have this RNC Id registered already. Make sure that the
-		 * details match. */
-
-		/* TODO should a mismatch be an error? */
-		if (rnc->lac != lac || rnc->rac != rac)
-			LOGP(DRANAP, LOGL_NOTICE, "RNC %d changes its details:"
-			     " LAC=%d RAC=%d --> LAC=%d RAC=%d\n",
-			     rnc->rnc_id, rnc->lac, rnc->rac,
-			     lac, rac);
-		rnc->lac = lac;
-		rnc->rac = rac;
-
-		if (addr && memcmp(&rnc->sccp_addr, addr, sizeof(*addr)))
-			LOGP(DRANAP, LOGL_NOTICE, "RNC %d on New SCCP Addr %s"
-			     " (LAC=%d RAC=%d)\n",
-			     rnc->rnc_id, osmo_sccp_addr_dump(addr), rnc->lac, rnc->rac);
-		rnc->sccp_addr = *addr;
-		return rnc;
-	}
-
-	/* Not found, make a new one. */
-	return iu_rnc_alloc(rnc_id, lac, rac, addr);
-}
-
-/***********************************************************************
- * RANAP handling
- ***********************************************************************/
-
-int iu_rab_act(struct ue_conn_ctx *ue_ctx, struct msgb *msg)
-{
-	struct osmo_scu_prim *prim;
-
-	/* wrap RANAP message in SCCP N-DATA.req */
-	prim = (struct osmo_scu_prim *) msgb_push(msg, sizeof(*prim));
-	prim->u.data.conn_id = ue_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);
-}
-
-int iu_rab_deact(struct ue_conn_ctx *ue_ctx, uint8_t rab_id)
-{
-	/* FIXME */
-	return -1;
-}
-
-int iu_tx_sec_mode_cmd(struct ue_conn_ctx *uectx, struct gsm_auth_tuple *tp,
-		       int send_ck, int new_key)
-{
-	struct osmo_scu_prim *prim;
-	struct msgb *msg;
-
-	/* create RANAP message */
-	msg = ranap_new_msg_sec_mod_cmd(tp->vec.ik, send_ck? tp->vec.ck : NULL,
-			new_key ? RANAP_KeyStatus_new : RANAP_KeyStatus_old);
-	msg->l2h = msg->data;
-	/* wrap RANAP message in SCCP N-DATA.req */
-	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;
-}
-
-int iu_tx_common_id(struct ue_conn_ctx *uectx, const char *imsi)
-{
-	struct msgb *msg;
-	struct osmo_scu_prim *prim;
-
-	LOGP(DRANAP, LOGL_INFO, "Transmitting RANAP CommonID (SCCP conn_id %u)\n",
-	     uectx->conn_id);
-
-	msg = ranap_new_msg_common_id(imsi);
-	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;
-}
-
-static int iu_grnc_id_parse(struct iu_grnc_id *dst,
-			    struct RANAP_GlobalRNC_ID *src)
-{
-	/* The size is coming from arbitrary sender, check it gracefully */
-	if (src->pLMNidentity.size != 3) {
-		LOGP(DRANAP, LOGL_ERROR, "Invalid PLMN Identity size:"
-		     " should be 3, is %d\n", src->pLMNidentity.size);
-		return -1;
-	}
-	gsm48_mcc_mnc_from_bcd(&src->pLMNidentity.buf[0],
-			       &dst->mcc, &dst->mnc);
-	dst->rnc_id = (uint16_t)src->rNC_ID;
-	return 0;
-}
-
-#if 0
- -- not used at present --
-static int iu_grnc_id_compose(struct iu_grnc_id *src,
-			      struct RANAP_GlobalRNC_ID *dst)
-{
-	/* The caller must ensure proper size */
-	OSMO_ASSERT(dst->pLMNidentity.size == 3);
-	gsm48_mcc_mnc_to_bcd(&dst->pLMNidentity.buf[0],
-			     src->mcc, src->mnc);
-	dst->rNC_ID = src->rnc_id;
-	return 0;
-}
-#endif
-
-static int ranap_handle_co_initial_ue(void *ctx, RANAP_InitialUE_MessageIEs_t *ies)
-{
-	struct ue_conn_ctx *ue_conn = ctx;
-	struct gprs_ra_id ra_id;
-	struct iu_grnc_id grnc_id;
-	uint16_t sai;
-	struct msgb *msg = msgb_alloc(256, "RANAP->NAS");
-
-	if (ranap_parse_lai(&ra_id, &ies->lai) != 0) {
-		LOGP(DRANAP, LOGL_ERROR, "Failed to parse RANAP LAI IE\n");
-		return -1;
-	}
-
-	if (ies->presenceMask & INITIALUE_MESSAGEIES_RANAP_RAC_PRESENT) {
-		ra_id.rac = asn1str_to_u8(&ies->rac);
-	}
-
-	if (iu_grnc_id_parse(&grnc_id, &ies->globalRNC_ID) != 0) {
-		LOGP(DRANAP, LOGL_ERROR,
-		     "Failed to parse RANAP Global-RNC-ID IE\n");
-		return -1;
-	}
-
-	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;
-
-	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;
-}
-