Co-Authored by dwillmann, laforge, nhofmeyr

Change-Id: Iffc26f9c73cb15463948f7435b72ac1747aabdb3
changes/88/3188/1
Neels Hofmeyr 7 years ago
parent 4ac3aee711
commit bfa8878a07
  1. 1
      openbsc/configure.ac
  2. 3
      openbsc/include/openbsc/Makefile.am
  3. 60
      openbsc/include/openbsc/iu.h
  4. 13
      openbsc/src/Makefile.am
  5. 10
      openbsc/src/libiu/Makefile.am
  6. 760
      openbsc/src/libiu/iu.c

@ -203,6 +203,7 @@ AC_OUTPUT(
src/libmgcp/Makefile
src/libcommon/Makefile
src/libfilter/Makefile
src/libiu/Makefile
src/osmo-nitb/Makefile
src/osmo-bsc/Makefile
src/osmo-bsc_nat/Makefile

@ -18,7 +18,8 @@ noinst_HEADERS = abis_nm.h abis_rsl.h db.h gsm_04_08.h gsm_data.h \
gprs_gb_parse.h smpp.h meas_feed.h \
gprs_gsup_client.h bsc_msg_filter.h \
oap.h oap_messages.h \
gtphub.h gprs_llc_xid.h gprs_sndcp.h
gtphub.h gprs_llc_xid.h gprs_sndcp.h \
iu.h
openbsc_HEADERS = gsm_04_08.h meas_rep.h bsc_api.h
openbscdir = $(includedir)/openbsc

@ -0,0 +1,60 @@
#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);

@ -2,9 +2,18 @@ AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOVTY_CFLAGS) $(COVERAGE_CFLAGS)
AM_LDFLAGS = $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) $(COVERAGE_LDFLAGS)
SUBDIRS = libcommon libmgcp libbsc libmsc libtrau libfilter osmo-nitb osmo-bsc_mgcp utils ipaccess gprs
# Libraries
SUBDIRS = libcommon libmgcp libbsc libmsc libtrau libfilter
# Conditional modules
# Conditional Libraries
if BUILD_IU
SUBDIRS += libiu
endif
# Programs
SUBDIRS += osmo-nitb osmo-bsc_mgcp utils ipaccess gprs
# Conditional Programs
if BUILD_NAT
SUBDIRS += osmo-bsc_nat
endif

@ -0,0 +1,10 @@
AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS) $(LIBOSMOVTY_CFLAGS) \
$(LIBOSMOGSM_CFLAGS) $(LIBOSMOABIS_CFLAGS) $(COVERAGE_CFLAGS) $(LIBCRYPTO_CFLAGS) \
$(LIBASN1C_CFLAGS) \
$(LIBOSMOSIGTRAN_CFLAGS) $(LIBOSMORANAP_CFLAGS)
noinst_LIBRARIES = libiu.a
libiu_a_SOURCES = iu.c

@ -0,0 +1,760 @@
/* 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/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 {
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_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[] = {
#define IU_EVT_STR(X) { X, #X }
IU_EVT_STR(IU_EVENT_RAB_ASSIGN),
IU_EVT_STR(IU_EVENT_SECURITY_MODE_COMPLETE),
IU_EVT_STR(IU_EVENT_IU_RELEASE),
IU_EVT_STR(IU_EVENT_LINK_INVALIDATED),
#undef IU_EVT_STR
};
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;
}
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->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, "RAB Asignment Response:");
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);
}
LOGPC(DRANAP, LOGL_INFO, "\n");
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);
}
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