Drop Iu*S support and related dependencies

There's optional libiu for Iu*S support but it's just a leftover from
pre repo-split times:
* it's not used by any code
* it's not checked by gerrit verification in osmo-ci
* it's disabled by default
* it's not supported in .deb packages

Instead of dragging old code in unknown stage of bit-rotting, let's just
drop it completely.

Change-Id: Id5678a74504b4456aba0438ccc34731770801128

7 files changed, 0 insertions, 918 deletions

diff --git a/openbsc/configure.ac b/openbsc/configure.ac
index 4b432b143..704c7d7e1 100644
--- a/openbsc/configure.ac
+++ b/openbsc/configure.ac
@@ -98,18 +98,6 @@ fi
 AM_CONDITIONAL(BUILD_MGCP_TRANSCODING, test "x$osmo_ac_mgcp_transcoding" = "xyes")
 AC_SUBST(osmo_ac_mgcp_transcoding)
 
-# Enable/disable 3G aka IuPS + IuCS support?
-AC_ARG_ENABLE([iu], [AS_HELP_STRING([--enable-iu], [Build 3G support, aka IuPS and IuCS interfaces])],
-    [osmo_ac_iu="$enableval"],[osmo_ac_iu="no"])
-if test "x$osmo_ac_iu" = "xyes" ; then
-    PKG_CHECK_MODULES(LIBASN1C, libasn1c >= 0.9.31)
-    PKG_CHECK_MODULES(LIBOSMORANAP, libosmo-ranap >= 0.3.0)
-    PKG_CHECK_MODULES(LIBOSMOSIGTRAN, libosmo-sigtran >= 0.9.0)
-    AC_DEFINE(BUILD_IU, 1, [Define if we want to build IuPS and IuCS interfaces support])
-fi
-AM_CONDITIONAL(BUILD_IU, test "x$osmo_ac_iu" = "xyes")
-AC_SUBST(osmo_ac_iu)
-
 
 dnl checks for header files
 AC_HEADER_STDC
@@ -252,7 +240,6 @@ AC_OUTPUT(
     src/libmgcp/Makefile
     src/libcommon/Makefile
     src/libfilter/Makefile
-    src/libiu/Makefile
     src/libcommon-cs/Makefile
     src/osmo-nitb/Makefile
     src/osmo-bsc/Makefile
diff --git a/openbsc/include/openbsc/Makefile.am b/openbsc/include/openbsc/Makefile.am
index 1fa30d56c..59b2231f3 100644
--- a/openbsc/include/openbsc/Makefile.am
+++ b/openbsc/include/openbsc/Makefile.am
@@ -32,7 +32,6 @@ noinst_HEADERS = \
 	handover.h \
 	handover_decision.h \
 	ipaccess.h \
-	iu.h \
 	meas_feed.h \
 	meas_rep.h \
 	mgcp.h \
diff --git a/openbsc/include/openbsc/iu.h b/openbsc/include/openbsc/iu.h
deleted file mode 100644
index f973ac1ba..000000000
--- a/openbsc/include/openbsc/iu.h
+++ /dev/null
@@ -1,62 +0,0 @@
-#pragma once
-
-#include <stdbool.h>
-
-struct sgsn_pdp_ctx;
-struct msgb;
-struct gprs_ra_id;
-
-struct RANAP_RAB_SetupOrModifiedItemIEs_s;
-struct RANAP_GlobalRNC_ID;
-
-struct ue_conn_ctx {
-	struct llist_head list;
-	struct osmo_sccp_link *link;
-	uint32_t conn_id;
-	int integrity_active;
-	struct gprs_ra_id ra_id;
-};
-
-enum iu_event_type {
-	IU_EVENT_RAB_ASSIGN,
-	IU_EVENT_SECURITY_MODE_COMPLETE,
-	IU_EVENT_IU_RELEASE, /* An actual Iu Release message was received */
-	IU_EVENT_LINK_INVALIDATED, /* A SUA link was lost or closed down */
-	/* FIXME: maybe IU_EVENT_IU_RELEASE and IU_EVENT_LINK_INVALIDATED
-	 * should be combined to one generic event that simply means the
-	 * ue_conn_ctx should no longer be used, for whatever reason. */
-};
-
-extern const struct value_string iu_event_type_names[];
-static inline const char *iu_event_type_str(enum iu_event_type e)
-{
-	return get_value_string(iu_event_type_names, e);
-}
-
-/* Implementations of iu_recv_cb_t shall find the ue_conn_ctx in msg->dst. */
-typedef int (* iu_recv_cb_t )(struct msgb *msg, struct gprs_ra_id *ra_id,
-			      /* TODO "gprs_" in generic CS+PS domain ^ */
-			      uint16_t *sai);
-
-typedef int (* iu_event_cb_t )(struct ue_conn_ctx *ue_ctx,
-			       enum iu_event_type type, void *data);
-
-typedef int (* iu_rab_ass_resp_cb_t )(struct ue_conn_ctx *ue_ctx, uint8_t rab_id,
-		struct RANAP_RAB_SetupOrModifiedItemIEs_s *setup_ies);
-
-int iu_init(void *ctx, const char *listen_addr, uint16_t listen_port,
-	    iu_recv_cb_t iu_recv_cb, iu_event_cb_t iu_event_cb);
-
-void iu_link_del(struct osmo_sccp_link *link);
-
-int iu_tx(struct msgb *msg, uint8_t sapi);
-
-int iu_page_cs(const char *imsi, const uint32_t *tmsi, uint16_t lac);
-int iu_page_ps(const char *imsi, const uint32_t *ptmsi, uint16_t lac, uint8_t rac);
-
-int iu_rab_act(struct ue_conn_ctx *ue_ctx, struct msgb *msg);
-int iu_rab_deact(struct ue_conn_ctx *ue_ctx, uint8_t rab_id);
-int iu_tx_sec_mode_cmd(struct ue_conn_ctx *uectx, struct gsm_auth_tuple *tp,
-		       int send_ck, int new_key);
-
-void iu_vty_init(int *asn_debug_p);
diff --git a/openbsc/src/Makefile.am b/openbsc/src/Makefile.am
index 86d6f8f83..46f30d7c1 100644
--- a/openbsc/src/Makefile.am
+++ b/openbsc/src/Makefile.am
@@ -30,13 +30,6 @@ SUBDIRS = \
 	libcommon-cs \
 	$(NULL)
 
-# Conditional Libraries
-if BUILD_IU
-SUBDIRS += \
-	libiu \
-	$(NULL)
-endif
-
 # Programs
 SUBDIRS += \
 	osmo-nitb \
diff --git a/openbsc/src/libiu/Makefile.am b/openbsc/src/libiu/Makefile.am
deleted file mode 100644
index e5f9e2751..000000000
--- a/openbsc/src/libiu/Makefile.am
+++ /dev/null
@@ -1,28 +0,0 @@
-AM_CPPFLAGS = \
-	$(all_includes) \
-	-I$(top_srcdir)/include \
-	-I$(top_builddir) \
-	$(NULL)
-
-AM_CFLAGS = \
-	-Wall \
-	$(COVERAGE_CFLAGS) \
-	$(LIBCRYPTO_CFLAGS) \
-	$(LIBASN1C_CFLAGS) \
-	$(LIBOSMOCORE_CFLAGS) \
-	$(LIBOSMOVTY_CFLAGS) \
-	$(LIBOSMOGSM_CFLAGS) \
-	$(LIBOSMOABIS_CFLAGS) \
-	$(LIBOSMOSIGTRAN_CFLAGS) \
-	$(LIBOSMORANAP_CFLAGS) \
-	$(NULL)
-
-noinst_LIBRARIES = \
-	libiu.a \
-	$(NULL)
-
-libiu_a_SOURCES = \
-	iu.c \
-	iu_vty.c \
-	$(NULL)
-
diff --git a/openbsc/src/libiu/iu.c b/openbsc/src/libiu/iu.c
deleted file mode 100644
index b4e7ac855..000000000
--- a/openbsc/src/libiu/iu.c
+++ /dev/null
@@ -1,757 +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/sua.h>
-#include <osmocom/sigtran/sccp_sap.h>
-#include <osmocom/sigtran/sccp_helpers.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 {
-	struct osmo_plmn_id plmn;
-	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_link. 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_link *link;
-};
-
-void *talloc_iu_ctx;
-
-int asn1_xer_print = 1;
-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);
-
-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_link *link, uint32_t conn_id)
-{
-	struct ue_conn_ctx *ctx = talloc_zero(talloc_iu_ctx, struct ue_conn_ctx);
-
-	ctx->link = link;
-	ctx->conn_id = conn_id;
-	llist_add(&ctx->list, &ue_conn_ctx_list);
-
-	return ctx;
-}
-
-struct ue_conn_ctx *ue_conn_ctx_find(struct osmo_sccp_link *link,
-				     uint32_t conn_id)
-{
-	struct ue_conn_ctx *ctx;
-
-	llist_for_each_entry(ctx, &ue_conn_ctx_list, list) {
-		if (ctx->link == link && 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_link *link)
-{
-	struct iu_rnc *rnc = talloc_zero(talloc_iu_ctx, struct iu_rnc);
-
-	rnc->rnc_id = rnc_id;
-	rnc->lac = lac;
-	rnc->rac = rac;
-	rnc->link = link;
-	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_link *link)
-{
-	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 (link && rnc->link != link)
-			LOGP(DRANAP, LOGL_NOTICE, "RNC %d on new link"
-			     " (LAC=%d RAC=%d)\n",
-			     rnc->rnc_id, rnc->lac, rnc->rac);
-		rnc->link = link;
-		return rnc;
-	}
-
-	/* Not found, make a new one. */
-	return iu_rnc_alloc(rnc_id, lac, rac, link);
-}
-
-/* Discard/invalidate all ue_conn_ctx and iu_rnc entries that reference the
- * given link, since this link is invalid and about to be deallocated. For
- * each ue_conn_ctx, invoke the iu_event_cb_t with IU_EVENT_LINK_INVALIDATED.
- */
-void iu_link_del(struct osmo_sccp_link *link)
-{
-	struct iu_rnc *rnc, *rnc_next;
-	llist_for_each_entry_safe(rnc, rnc_next, &rnc_list, entry) {
-		if (!rnc->link)
-			continue;
-		if (rnc->link != link)
-			continue;
-		rnc->link = NULL;
-		llist_del(&rnc->entry);
-		talloc_free(rnc);
-	}
-
-	struct ue_conn_ctx *uec, *uec_next;
-	llist_for_each_entry_safe(uec, uec_next, &ue_conn_ctx_list, list) {
-		if (uec->link != link)
-			continue;
-		uec->link = NULL;
-		global_iu_event_cb(uec, IU_EVENT_LINK_INVALIDATED, NULL);
-	}
-}
-
-/***********************************************************************
- * 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_sua_user_link_down(ue_ctx->link, &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;
-	uint8_t ik[16];
-	uint8_t ck[16];
-	unsigned int i;
-
-	/* C5 function to derive IK from Kc */
-	for (i = 0; i < 4; i++)
-		ik[i] = tp->vec.kc[i] ^ tp->vec.kc[i+4];
-	memcpy(ik+4, tp->vec.kc, 8);
-	for (i = 12; i < 16; i++)
-		ik[i] = ik[i-12];
-
-	if (send_ck) {
-		/* C4 function to derive CK from Kc */
-		memcpy(ck, tp->vec.kc, 8);
-		memcpy(ck+8, tp->vec.kc, 8);
-	}
-
-	/* create RANAP message */
-	msg = ranap_new_msg_sec_mod_cmd(ik, send_ck? 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_sua_user_link_down(uectx->link, &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;
-	}
-	osmo_plmn_from_bcd(&src->pLMNidentity.buf[0], &dst->plmn);
-	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->link);
-	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 (SUA link %p conn_id %u)\n",
-	     uectx->link, 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_sua_user_link_down(uectx->link, &prim->oph);
-	return 0;
-}
-
-static int ranap_handle_co_iu_rel_req(struct ue_conn_ctx *ctx, RANAP_Iu_ReleaseRequestIEs_t *ies)
-{
-	struct msgb *msg;
-	struct osmo_scu_prim *prim;
-
-	LOGP(DRANAP, LOGL_INFO, "Received Iu Release Request, Sending Release Command\n");
-	msg = ranap_new_msg_iu_rel_cmd(&ies->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);
-	osmo_sua_user_link_down(ctx->link, &prim->oph);
-	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);
-	}
-
-	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
- ***********************************************************************/
-
-/* Send a paging command down a given SUA link. 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_link *link,
-			    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;
-	return osmo_sccp_tx_unitdata_ranap(link, 1, 2, msg->data,
-					   msgb_length(msg));
-}
-
-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->link) {
-			/* Not actually connected, don't count it. */
-			continue;
-		}
-		if (rnc->lac != lac)
-			continue;
-		if (is_ps && rnc->rac != rac)
-			continue;
-
-		/* Found a match! */
-		if (iu_tx_paging_cmd(rnc->link, imsi, tmsi_or_ptimsi, is_ps, 0)
-		    == 0) {
-			LOGP(DRANAP, LOGL_DEBUG,
-			     "%s: Paged for IMSI %s on RNC %d, on SUA link %p\n",
-			     is_ps? "IuPS" : "IuCS",
-			     imsi, rnc->rnc_id, rnc->link);
-			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_link *link);
-int tx_conn_req(struct osmo_sccp_link *link, 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 *link)
-{
-	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(link, prim->u.connect.conn_id);
-		/* first ensure the local SUA/SCCP socket is ACTIVE */
-		resp = make_conn_resp(&prim->u.connect);
-		osmo_sua_user_link_down(link, 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(link, 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(link, 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, link, msgb_l2(oph->msg), msgb_l2len(oph->msg));
-		break;
-	default:
-		rc = -1;
-		break;
-	}
-
-	msgb_free(oph->msg);
-	return rc;
-}
-
-int iu_init(void *ctx, const char *listen_addr, uint16_t listen_port,
-	    iu_recv_cb_t iu_recv_cb, iu_event_cb_t iu_event_cb)
-{
-	struct osmo_sccp_user *user;
-	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;
-	osmo_sua_set_log_area(DSUA);
-	user = osmo_sua_user_create(talloc_iu_ctx, sccp_sap_up, talloc_iu_ctx);
-	return osmo_sua_server_listen(user, listen_addr, listen_port);
-}
-
diff --git a/openbsc/src/libiu/iu_vty.c b/openbsc/src/libiu/iu_vty.c
deleted file mode 100644
index 91eed96be..000000000
--- a/openbsc/src/libiu/iu_vty.c
+++ /dev/null
@@ -1,50 +0,0 @@
-/* OpenBSC Iu related interface to quagga VTY */
-/* (C) 2016 by sysmocom s.m.f.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 <stdlib.h>
-
-#include <osmocom/vty/command.h>
-#include <osmocom/vty/logging.h>
-
-/* Pointer to the actual asn_debug value as passed from main scopes. */
-static int *g_asn_debug_p = NULL;
-
-DEFUN(logging_asn_debug,
-      logging_asn_debug_cmd,
-      "logging asn1-debug (1|0)",
-      LOGGING_STR
-      "Log human readable representations of all ASN.1 messages to stderr\n"
-      "Log decoded ASN.1 messages to stderr\n"
-      "Do not log decoded ASN.1 messages to stderr\n")
-{
-	if (!g_asn_debug_p) {
-		vty_out(vty, "%%ASN.1 debugging not available%s", VTY_NEWLINE);
-		return CMD_WARNING;
-	}
-
-	*g_asn_debug_p = atoi(argv[0]);
-	return CMD_SUCCESS;
-}
-
-void iu_vty_init(int *asn_debug_p)
-{
-	g_asn_debug_p = asn_debug_p;
-
-	install_element(CFG_LOG_NODE, &logging_asn_debug_cmd);
-}