ranap_common_ran: add decoder for CN/MSC originated messages

Lets add a counterpart for ranap_common_cn that works the same, but
decodes CN/MSC originated messages.

Change-Id: Iad4c2743d4d1ddf8ad49002d1fe6866f22eb9e98
Related: OS#5152
changes/55/26955/6
Philipp Maier 1 year ago
parent ca6054ef8c
commit 63a0cfe04e
  1. 1
      include/osmocom/ranap/Makefile.am
  2. 3
      include/osmocom/ranap/ranap_common.h
  3. 2
      include/osmocom/ranap/ranap_common_cn.h
  4. 15
      include/osmocom/ranap/ranap_common_ran.h
  5. 2
      src/Makefile.am
  6. 184
      src/ranap_common_ran.c

@ -10,6 +10,7 @@ ranap_HEADERS = \
ranap_ies_defs.h \
ranap_common.h \
ranap_common_cn.h \
ranap_common_ran.h \
ranap_msg_factory.h \
iu_helpers.h \
iu_client.h \

@ -596,6 +596,9 @@ struct gprs_ra_id;
extern int _ranap_DRANAP;
#define RANAP_DEBUG(x, args ...) DEBUGP(_ranap_DRANAP, x, ## args)
/* Callback to be used with decoder functions in ranap_common_cn.c ranap_common_ran.c */
typedef void (*ranap_handle_cb)(void *ctx, ranap_message *ranap_msg);
extern int asn1_xer_print;
extern const struct value_string ranap_presence_vals[5];

@ -5,8 +5,6 @@
#include <osmocom/ranap/ranap_common.h>
#include <osmocom/ranap/ranap_ies_defs.h>
typedef void (*ranap_handle_cb)(void *ctx, ranap_message *ranap_msg);
/* free a decoded connection-less RANAP message */
void ranap_cn_rx_cl_free(ranap_message *message);

@ -0,0 +1,15 @@
#pragma once
#include <stdint.h>
#include <osmocom/ranap/ranap_common.h>
#include <osmocom/ranap/ranap_ies_defs.h>
/* free a decoded connection-oriented RANAP message */
void ranap_ran_rx_co_free(ranap_message *message);
/* decode a connection-oriented RANAP message */
int ranap_ran_rx_co_decode(void *ctx, ranap_message *message, uint8_t *data, size_t len);
/* receive a connection-oriented RANAP message */
int ranap_ran_rx_co(ranap_handle_cb cb, void *ctx, uint8_t *data, size_t len);

@ -75,7 +75,7 @@ libosmo_ranap_la_LDFLAGS = $(AM_LDFLAGS) -version-info $(RANAP_LIBVERSION)
libosmo_ranap_la_LIBADD = $(OSMOCORE_LIBS) $(OSMOGSM_LIBS) $(OSMOVTY_LIBS) $(OSMOSIGTRAN_LIBS) \
$(ASN1C_LIBS) ranap/libosmo-asn1-ranap.la
libosmo_ranap_la_SOURCES = ranap_common.c ranap_encoder.c ranap_decoder.c ranap_msg_factory.c iu_helpers.c \
ranap_common_cn.c iu_client.c iu_client_vty.c
ranap_common_cn.c ranap_common_ran.c iu_client.c iu_client_vty.c
libosmo_rua_la_LDFLAGS = $(AM_LDFLAGS) -version-info $(HNBAP_LIBVERSION)
libosmo_rua_la_LIBADD = $(OSMOCORE_LIBS) $(OSMOGSM_LIBS) $(OSMOVTY_LIBS) $(OSMOSIGTRAN_LIBS) \

@ -0,0 +1,184 @@
/* RANAP interface for a ran-network node */
/* (C) 2021 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
* All Rights Reserved
*
* Author: Philipp Maier
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/logging.h>
#include <osmocom/ranap/ranap_common.h>
#include <osmocom/ranap/ranap_common_ran.h>
#include <osmocom/ranap/ranap_ies_defs.h>
#define DRANAP _ranap_DRANAP
static int ran_ranap_rx_initiating_msg_co(void *ctx, RANAP_InitiatingMessage_t *imsg, ranap_message *message)
{
int rc = 0;
message->procedureCode = imsg->procedureCode;
message->criticality = imsg->criticality;
DEBUGP(DRANAP, "Rx CO IM (%s)\n", get_value_string(ranap_procedure_code_vals, imsg->procedureCode));
switch (imsg->procedureCode) {
case RANAP_ProcedureCode_id_RAB_Assignment:
rc = ranap_decode_rab_assignmentrequesties(&message->msg.raB_AssignmentRequestIEs, &imsg->value);
break;
case RANAP_ProcedureCode_id_Iu_Release:
rc = ranap_decode_iu_releasecommandies(&message->msg.iu_ReleaseCommandIEs, &imsg->value);
break;
default:
LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP Procedure %s (CO, IM) from CN, ignoring\n",
get_value_string(ranap_procedure_code_vals, imsg->procedureCode));
rc = -1;
break;
}
return rc;
}
static void ran_ranap_free_initiating_msg_co(ranap_message *message)
{
switch (message->procedureCode) {
case RANAP_ProcedureCode_id_RAB_Assignment:
ranap_free_rab_assignmentrequesties(&message->msg.raB_AssignmentRequestIEs);
break;
case RANAP_ProcedureCode_id_Iu_Release:
ranap_free_iu_releasecommandies(&message->msg.iu_ReleaseCommandIEs);
break;
default:
LOGP(DRANAP, LOGL_NOTICE, "Not freeing suspicious RANAP "
"Procedure %s (CO, IM) from CN\n",
get_value_string(ranap_procedure_code_vals, message->procedureCode));
break;
}
}
static int _ran_ranap_rx_co(void *ctx, RANAP_RANAP_PDU_t *pdu, ranap_message *message)
{
int rc = 0;
switch (pdu->present) {
case RANAP_RANAP_PDU_PR_initiatingMessage:
rc = ran_ranap_rx_initiating_msg_co(ctx, &pdu->choice.initiatingMessage, message);
break;
case RANAP_RANAP_PDU_PR_successfulOutcome:
LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP "
"successful outcome procedure %s (CO) from CN, ignoring\n",
get_value_string(ranap_procedure_code_vals, pdu->choice.successfulOutcome.procedureCode));
rc = -1;
break;
case RANAP_RANAP_PDU_PR_unsuccessfulOutcome:
LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP "
"unsuccessful outcome procedure %s (CO) from CN, ignoring\n",
get_value_string(ranap_procedure_code_vals, pdu->choice.unsuccessfulOutcome.procedureCode));
rc = -1;
break;
case RANAP_RANAP_PDU_PR_outcome:
LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP "
"outcome procedure %s (CO) from CN, ignoring\n",
get_value_string(ranap_procedure_code_vals, pdu->choice.outcome.procedureCode));
rc = -1;
break;
default:
LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP "
"presence %s (CO) from CN, ignoring\n", get_value_string(ranap_presence_vals, pdu->present));
rc = -1;
break;
}
return rc;
}
/* free a decoded connection-oriented RANAP message */
void ranap_ran_rx_co_free(ranap_message *message)
{
switch (message->direction) {
case RANAP_RANAP_PDU_PR_initiatingMessage:
ran_ranap_free_initiating_msg_co(message);
break;
case RANAP_RANAP_PDU_PR_successfulOutcome:
LOGP(DRANAP, LOGL_NOTICE, "Not freeing unsupported RANAP "
"successful outcome procedure (CO) from CN\n");
break;
case RANAP_RANAP_PDU_PR_unsuccessfulOutcome:
LOGP(DRANAP, LOGL_NOTICE, "Not freeing unsupported RANAP "
"unsuccessful outcome procedure (CO) from CN\n");
break;
case RANAP_RANAP_PDU_PR_outcome:
LOGP(DRANAP, LOGL_NOTICE, "Not freeing unsupported RANAP "
"outcome procedure (CO) from CN\n");
break;
default:
LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP "
"presence %s (CO) from CN, ignoring\n",
get_value_string(ranap_presence_vals, message->direction));
break;
}
}
/* decode a connection-oriented RANAP message */
int ranap_ran_rx_co_decode(void *ctx, ranap_message *message, uint8_t *data, size_t len)
{
RANAP_RANAP_PDU_t *pdu = NULL;
asn_dec_rval_t dec_ret;
int rc;
memset(message, 0, sizeof(*message));
dec_ret = aper_decode(NULL, &asn_DEF_RANAP_RANAP_PDU, (void **)&pdu, data, len, 0, 0);
if (dec_ret.code != RC_OK) {
LOGP(DRANAP, LOGL_ERROR, "Error in RANAP ASN.1 decode\n");
return -1;
}
message->direction = pdu->present;
rc = _ran_ranap_rx_co(ctx, pdu, message);
ASN_STRUCT_FREE(asn_DEF_RANAP_RANAP_PDU, pdu);
return rc;
}
/* receive a connection-oriented RANAP message and call
* cn_ranap_handle_co() with the resulting ranap_message struct */
int ranap_ran_rx_co(ranap_handle_cb cb, void *ctx, uint8_t *data, size_t len)
{
ranap_message message;
int rc;
rc = ranap_ran_rx_co_decode(ctx, &message, data, len);
if (rc == 0)
(*cb) (ctx, &message);
else
LOGP(DRANAP, LOGL_ERROR, "Not calling ran_ranap_handle_co() due to rc=%d\n", rc);
/* Free the asn1 structs in message */
ranap_ran_rx_co_free(&message);
return rc;
}
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