dexter has uploaded this change for review.
ranap_common_ran: add decoder for RAN/RNC originated messages
Lets add a counterpart for ranap_common_cn that works the same, but
decodes RAN/RNC originated messages.
Related: OS#515
Change-Id: Iad4c2743d4d1ddf8ad49002d1fe6866f22eb9e98
---
M include/osmocom/ranap/Makefile.am
M include/osmocom/ranap/ranap_common.h
M include/osmocom/ranap/ranap_common_cn.h
A include/osmocom/ranap/ranap_common_ran.h
M src/Makefile.am
A src/ranap_common_ran.c
6 files changed, 280 insertions(+), 3 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-iuh refs/changes/55/26955/1
diff --git a/include/osmocom/ranap/Makefile.am b/include/osmocom/ranap/Makefile.am
index 1606928..2662484 100644
--- a/include/osmocom/ranap/Makefile.am
+++ b/include/osmocom/ranap/Makefile.am
@@ -10,6 +10,7 @@
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 \
diff --git a/include/osmocom/ranap/ranap_common.h b/include/osmocom/ranap/ranap_common.h
index e9e7a2e..efffd25 100644
--- a/include/osmocom/ranap/ranap_common.h
+++ b/include/osmocom/ranap/ranap_common.h
@@ -651,3 +651,5 @@
int ranap_decode_procedure_code(const uint8_t *ranap_pdu_encoded,
unsigned int len);
+
+typedef void (*ranap_handle_cb)(void *ctx, ranap_message *ranap_msg);
diff --git a/include/osmocom/ranap/ranap_common_cn.h b/include/osmocom/ranap/ranap_common_cn.h
index dfce358..7964b7c 100644
--- a/include/osmocom/ranap/ranap_common_cn.h
+++ b/include/osmocom/ranap/ranap_common_cn.h
@@ -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);
-
/* receive a connection-less RANAP message */
int ranap_cn_rx_cl(ranap_handle_cb cb, void *ctx, uint8_t *data, size_t len);
diff --git a/include/osmocom/ranap/ranap_common_ran.h b/include/osmocom/ranap/ranap_common_ran.h
new file mode 100644
index 0000000..431a276
--- /dev/null
+++ b/include/osmocom/ranap/ranap_common_ran.h
@@ -0,0 +1,9 @@
+#pragma once
+
+#include <stdint.h>
+
+#include <osmocom/ranap/ranap_common.h>
+#include <osmocom/ranap/ranap_ies_defs.h>
+
+/* receive a connection-oriented RANAP message */
+int ranap_ran_rx_co(ranap_handle_cb cb, void *ctx, uint8_t *data, size_t len);
diff --git a/src/Makefile.am b/src/Makefile.am
index 6c10564..0407fa3 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -75,7 +75,7 @@
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) \
diff --git a/src/ranap_common_ran.c b/src/ranap_common_ran.c
new file mode 100644
index 0000000..1a0b222
--- /dev/null
+++ b/src/ranap_common_ran.c
@@ -0,0 +1,267 @@
+/* RANAP interface for a ran-network node */
+
+/* (C) 2015 by Harald Welte <laforge@gnumonks.org>
+ * 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 <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 RNC, 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 RNC\n",
+ get_value_string(ranap_procedure_code_vals, message->procedureCode));
+ break;
+ }
+}
+
+static int cn_ranap_rx_successful_msg_co(void *ctx, RANAP_SuccessfulOutcome_t * imsg, ranap_message * message)
+{
+ int rc = 0;
+
+ message->procedureCode = imsg->procedureCode;
+ message->criticality = imsg->criticality;
+
+ DEBUGP(DRANAP, "Rx CO SO (%s)\n", get_value_string(ranap_procedure_code_vals, imsg->procedureCode));
+
+ switch (imsg->procedureCode) {
+ case RANAP_ProcedureCode_id_RAB_Assignment:
+ /* RAB assignment response */
+ rc = ranap_decode_rab_assignmentresponseies(&message->msg.raB_AssignmentResponseIEs, &imsg->value);
+ break;
+ case RANAP_ProcedureCode_id_SecurityModeControl:
+ /* Security Mode Complete */
+ rc = ranap_decode_securitymodecompleteies(&message->msg.securityModeCompleteIEs, &imsg->value);
+ break;
+ case RANAP_ProcedureCode_id_Iu_Release:
+ /* Iu release Complete; confirmation of CN-initiated release */
+ rc = ranap_decode_iu_releasecompleteies(&message->msg.iu_ReleaseCompleteIEs, &imsg->value);
+ break;
+ default:
+ LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP "
+ "Procedure %s (SO) from RNC, ignoring\n",
+ get_value_string(ranap_procedure_code_vals, imsg->procedureCode));
+ rc = -1;
+ break;
+ }
+
+ return rc;
+}
+
+static void cn_ranap_free_successful_msg_co(ranap_message * message)
+{
+ switch (message->procedureCode) {
+ case RANAP_ProcedureCode_id_RAB_Assignment:
+ /* RAB assignment response */
+ ranap_free_rab_assignmentresponseies(&message->msg.raB_AssignmentResponseIEs);
+ break;
+ case RANAP_ProcedureCode_id_SecurityModeControl:
+ /* Security Mode Complete */
+ ranap_free_securitymodecompleteies(&message->msg.securityModeCompleteIEs);
+ break;
+ case RANAP_ProcedureCode_id_Iu_Release:
+ /* Iu release Complete; confirmation of CN-initiated release */
+ ranap_free_iu_releasecompleteies(&message->msg.iu_ReleaseCompleteIEs);
+ break;
+ default:
+ LOGP(DRANAP, LOGL_NOTICE, "Not freeing suspicious RANAP "
+ "Procedure %s (SO) from RNC\n",
+ get_value_string(ranap_procedure_code_vals, message->procedureCode));
+ break;
+ }
+}
+
+static int cn_ranap_rx_outcome_msg_co(void *ctx, RANAP_Outcome_t * imsg, ranap_message * message)
+{
+ int rc = 0;
+
+ message->procedureCode = imsg->procedureCode;
+ message->criticality = imsg->criticality;
+
+ DEBUGP(DRANAP, "Rx CO O (%s)\n", get_value_string(ranap_procedure_code_vals, imsg->procedureCode));
+
+ switch (imsg->procedureCode) {
+ case RANAP_ProcedureCode_id_RAB_Assignment:
+ /* RAB assignment response */
+ rc = ranap_decode_rab_assignmentresponseies(&message->msg.raB_AssignmentResponseIEs, &imsg->value);
+ break;
+ default:
+ LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP "
+ "Procedure %s (O) from RNC, ignoring\n",
+ get_value_string(ranap_procedure_code_vals, imsg->procedureCode));
+ rc = -1;
+ break;
+ }
+
+ return rc;
+}
+
+static void cn_ranap_free_outcome_msg_co(ranap_message * message)
+{
+ switch (message->procedureCode) {
+ case RANAP_ProcedureCode_id_RAB_Assignment:
+ /* RAB assignment response */
+ ranap_free_rab_assignmentresponseies(&message->msg.raB_AssignmentResponseIEs);
+ break;
+ default:
+ LOGP(DRANAP, LOGL_NOTICE, "Not freeing suspicious RANAP "
+ "Procedure %s (O) from RNC\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 RNC, ignoring\n",
+ get_value_string(ranap_procedure_code_vals, pdu->choice.unsuccessfulOutcome.procedureCode));
+ rc = -1;
+ break;
+ case RANAP_RANAP_PDU_PR_unsuccessfulOutcome:
+ LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP "
+ "unsuccessful outcome procedure %s (CO) from RNC, 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 RNC, ignoring\n",
+ get_value_string(ranap_procedure_code_vals, pdu->choice.unsuccessfulOutcome.procedureCode));
+ rc = -1;
+ break;
+ default:
+ LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP "
+ "presence %s (CO) from RNC, ignoring\n", get_value_string(ranap_presence_vals, pdu->present));
+ rc = -1;
+ break;
+ }
+
+ return rc;
+}
+
+static void _ran_ranap_free_co(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 "
+ "unsuccessful outcome procedure (CO) from RNC\n");
+ break;
+ case RANAP_RANAP_PDU_PR_unsuccessfulOutcome:
+ LOGP(DRANAP, LOGL_NOTICE, "Not freeing unsupported RANAP "
+ "unsuccessful outcome procedure (CO) from RNC\n");
+ break;
+ case RANAP_RANAP_PDU_PR_outcome:
+ LOGP(DRANAP, LOGL_NOTICE, "Not freeing unsupported RANAP "
+ "unsuccessful outcome procedure (CO) from RNC\n");
+ break;
+ default:
+ LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP "
+ "presence %s (CO) from RNC, ignoring\n",
+ get_value_string(ranap_presence_vals, message->direction));
+ break;
+ }
+}
+
+/* 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_RANAP_PDU_t *pdu = NULL;
+ ranap_message message;
+ 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);
+
+ 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 */
+ _ran_ranap_free_co(&message);
+
+ ASN_STRUCT_FREE(asn_DEF_RANAP_RANAP_PDU, pdu);
+
+ return rc;
+}
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