Osmocom Home NodeB Gateway, for attaching femtocells to the 3G CN (OsmoMSC, OsmoSGSN) https://osmocom.org/projects/osmohnbgw
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osmo-hnbgw/src/osmo-hnbgw/ranap_rab_ass.c

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24 KiB

/* (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/>.
*
*/
/* Note: This files contains tools to decode and re-encode the RAB-AssignmentRequest. This set of tools is used by
* mgcp_fsm.c to extract and manipulate the transportLayerAddress. */
#include <errno.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/sockaddr_str.h>
#include <osmocom/hnbgw/hnbgw.h>
#include <osmocom/ranap/ranap_common.h>
#include <osmocom/ranap/ranap_common_cn.h>
#include <osmocom/ranap/ranap_common_ran.h>
#include <osmocom/ranap/iu_helpers.h>
#include <asn1c/asn1helpers.h>
/*! Encode RABAP RAB AssignmentRequest from RANAP_RAB_AssignmentRequestIEs.
* \ptmap[out] data user provided memory to store resulting ASN.1 encoded message.
* \ptmap[in] len length of user provided memory to store resulting ASN.1 encoded message.
* \ptmap[in] ies user provided memory with RANAP_RAB_AssignmentRequestIEs.
* \returns resulting message length on success; negative on error. */
struct msgb *ranap_rab_ass_req_encode(RANAP_RAB_AssignmentRequestIEs_t *rab_assignment_request_ies)
{
int rc;
struct msgb *msg;
RANAP_RAB_AssignmentRequest_t _rab_assignment_request;
RANAP_RAB_AssignmentRequest_t *rab_assignment_request = &_rab_assignment_request;
memset(rab_assignment_request, 0, sizeof(*rab_assignment_request));
rc = ranap_encode_rab_assignmentrequesties(rab_assignment_request, rab_assignment_request_ies);
if (rc < 0)
return NULL;
/* generate an Initiating Mesasage */
msg = ranap_generate_initiating_message(RANAP_ProcedureCode_id_RAB_Assignment,
RANAP_Criticality_reject,
&asn_DEF_RANAP_RAB_AssignmentRequest, rab_assignment_request);
/* 'msg' has been generated, we cann now release the input 'out' */
ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_AssignmentRequest, rab_assignment_request);
return msg;
}
/*! Encode RABAP RAB AssignmentRequest from RANAP_RAB_AssignmentResponseIEs.
* \ptmap[out] data user provided memory to store resulting ASN.1 encoded message.
* \ptmap[in] len length of user provided memory to store resulting ASN.1 encoded message.
* \ptmap[in] ies user provided memory with RANAP_RAB_AssignmentResponseIEs.
* \returns resulting message length on success; negative on error. */
int ranap_rab_ass_resp_encode(uint8_t *data, unsigned int len,
RANAP_RAB_AssignmentResponseIEs_t *rab_assignment_response_ies)
{
int rc;
struct msgb *msg;
RANAP_RAB_AssignmentResponse_t _rab_assignment_response;
RANAP_RAB_AssignmentResponse_t *rab_assignment_response = &_rab_assignment_response;
memset(data, 0, len);
memset(rab_assignment_response, 0, sizeof(*rab_assignment_response));
rc = ranap_encode_rab_assignmentresponseies(rab_assignment_response, rab_assignment_response_ies);
if (rc < 0)
return -EINVAL;
/* generate an outcome mesasage */
msg = ranap_generate_outcome(RANAP_ProcedureCode_id_RAB_Assignment,
RANAP_Criticality_reject,
&asn_DEF_RANAP_RAB_AssignmentResponse, rab_assignment_response);
/* 'msg' has been generated, we cann now release the input 'out' */
ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_AssignmentResponse, rab_assignment_response);
if (!msg)
return -EINVAL;
if (msg->len > len)
return -EINVAL;
memcpy(data, msg->data, msg->len);
rc = msg->len;
msgb_free(msg);
return rc;
}
/* Pick the indexed item from the RAB setup-or-modify list and return the first protocol-ie-field-pair. */
static RANAP_ProtocolIE_FieldPair_t *prot_ie_field_pair_from_ass_req_ies(const RANAP_RAB_AssignmentRequestIEs_t *ies,
unsigned int index)
{
RANAP_ProtocolIE_ContainerPair_t *protocol_ie_container_pair;
RANAP_ProtocolIE_FieldPair_t *protocol_ie_field_pair;
/* Make sure we indeed deal with a setup-or-modify list */
if (!(ies->presenceMask & RAB_ASSIGNMENTREQUESTIES_RANAP_RAB_SETUPORMODIFYLIST_PRESENT)) {
RANAP_DEBUG
("Decoding failed, the RANAP RAB AssignmentRequest did not contain a setup-or-modify list!\n");
return NULL;
}
/* Detect the end of the list */
if (index >= ies->raB_SetupOrModifyList.list.count)
return NULL;
protocol_ie_container_pair = ies->raB_SetupOrModifyList.list.array[index];
protocol_ie_field_pair = protocol_ie_container_pair->list.array[0];
return protocol_ie_field_pair;
}
/* Pick the indexed item from the RAB release-list list and return a pointer to it */
static RANAP_IE_t *release_item_from_ass_req_ies(const RANAP_RAB_AssignmentRequestIEs_t *ies, unsigned int index)
{
/* Make sure we indeed deal with a setup-or-modify list */
if (!(ies->presenceMask & RAB_ASSIGNMENTREQUESTIES_RANAP_RAB_RELEASELIST_PRESENT)) {
RANAP_DEBUG
("Decoding failed, the RANAP RAB AssignmentRequest did not contain a release list!\n");
return NULL;
}
/* Detect the end of the list */
if (index >= ies->raB_ReleaseList.raB_ReleaseList_ies.list.count)
return NULL;
return ies->raB_ReleaseList.raB_ReleaseList_ies.list.array[index];
}
/* Pick the indexed item from the RAB setup-or-modified list and return a pointer to it */
static RANAP_IE_t *setup_or_modif_item_from_rab_ass_resp(const RANAP_RAB_AssignmentResponseIEs_t *ies,
unsigned int index)
{
/* Make sure we indeed deal with a setup-or-modified list */
if (!(ies->presenceMask & RAB_ASSIGNMENTRESPONSEIES_RANAP_RAB_SETUPORMODIFIEDLIST_PRESENT)) {
RANAP_DEBUG("RANAP RAB AssignmentResponse did not contain a setup-or-modified list!\n");
return NULL;
}
/* Detect the end of the list */
if (index >= ies->raB_SetupOrModifiedList.raB_SetupOrModifiedList_ies.list.count)
return NULL;
return ies->raB_SetupOrModifiedList.raB_SetupOrModifiedList_ies.list.array[index];
}
/* Pick the indexed item from the RAB failed list and return a pointer to it */
static RANAP_IE_t *failed_list_item_from_rab_ass_resp(const RANAP_RAB_AssignmentResponseIEs_t *ies,
unsigned int index)
{
/* Make sure we indeed deal with a failed list */
if (!(ies->presenceMask & RAB_ASSIGNMENTRESPONSEIES_RANAP_RAB_FAILEDLIST_PRESENT)) {
RANAP_DEBUG("RANAP RAB AssignmentResponse did not contain a failed list!\n");
return NULL;
}
/* Detect the end of the list */
if (index >= ies->raB_FailedList.raB_FailedList_ies.list.count)
return NULL;
return ies->raB_FailedList.raB_FailedList_ies.list.array[index];
}
/* find the RAB specified by rab_id in ies and when found, decode the result into items_ies */
static int decode_rab_smditms_from_resp_ies(RANAP_RAB_SetupOrModifiedItemIEs_t *items_ies,
RANAP_RAB_AssignmentResponseIEs_t *ies, uint8_t rab_id)
{
RANAP_IE_t *setup_or_modified_list_ie;
RANAP_RAB_SetupOrModifiedItem_t *rab_setup_or_modified_item;
int rc;
uint8_t rab_id_decoded;
unsigned int index = 0;
while (1) {
setup_or_modified_list_ie = setup_or_modif_item_from_rab_ass_resp(ies, index);
if (!setup_or_modified_list_ie)
return -EINVAL;
rc = ranap_decode_rab_setupormodifieditemies_fromlist(items_ies, &setup_or_modified_list_ie->value);
if (rc < 0)
return -EINVAL;
rab_setup_or_modified_item = &items_ies->raB_SetupOrModifiedItem;
/* The RAB-ID is defined as a bitstring with a size of 8 (1 byte),
* See also RANAP-IEs.asn, RAB-ID ::= BIT STRING (SIZE (8)) */
rab_id_decoded = rab_setup_or_modified_item->rAB_ID.buf[0];
if (rab_id_decoded == rab_id)
return index;
ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_SetupOrModifiedItem, items_ies);
index++;
}
}
/* See comment above decode_rab_smditms_from_resp_ies() */
static int decode_rab_flitms_from_resp_ies(RANAP_RAB_FailedItemIEs_t *items_ies,
RANAP_RAB_AssignmentResponseIEs_t *ies, uint8_t rab_id)
{
RANAP_IE_t *failed_list_ie;
RANAP_RAB_FailedItem_t *rab_failed_item;
int rc;
uint8_t rab_id_decoded;
unsigned int index = 0;
while (1) {
failed_list_ie = failed_list_item_from_rab_ass_resp(ies, index);
if (!failed_list_ie)
return -EINVAL;
rc = ranap_decode_rab_faileditemies_fromlist(items_ies, &failed_list_ie->value);
if (rc < 0)
return -EINVAL;
rab_failed_item = &items_ies->raB_FailedItem;
/* The RAB-ID is defined as a bitstring with a size of 8 (1 byte),
* See also RANAP-IEs.asn, RAB-ID ::= BIT STRING (SIZE (8)) */
rab_id_decoded = rab_failed_item->rAB_ID.buf[0];
if (rab_id_decoded == rab_id)
return index;
ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_FailedItem, items_ies);
index++;
}
}
/* find the RAB specified by rab_id in ies and when found, decode the result into item */
static int decode_rab_smditms_from_req_ies(RANAP_RAB_SetupOrModifyItemFirst_t *item,
RANAP_RAB_AssignmentRequestIEs_t *ies, uint8_t rab_id)
{
RANAP_ProtocolIE_FieldPair_t *protocol_ie_field_pair;
int rc;
uint8_t rab_id_decoded;
unsigned int index = 0;
while (1) {
protocol_ie_field_pair = prot_ie_field_pair_from_ass_req_ies(ies, index);
if (!protocol_ie_field_pair)
return -EINVAL;
if (protocol_ie_field_pair->id != RANAP_ProtocolIE_ID_id_RAB_SetupOrModifyItem) {
RANAP_DEBUG
("Decoding failed, the protocol IE field-pair is not of type RANAP RAB setup-or-modify-item!\n");
return -EINVAL;
}
rc = ranap_decode_rab_setupormodifyitemfirst(item, &protocol_ie_field_pair->firstValue);
if (rc < 0)
return -EINVAL;
rab_id_decoded = item->rAB_ID.buf[0];
if (rab_id_decoded == rab_id)
return index;
}
}
static int decode_rab_relitms_from_req_ies(RANAP_RAB_ReleaseItemIEs_t *items_ies,
RANAP_RAB_AssignmentRequestIEs_t *ies, uint8_t rab_id)
{
RANAP_IE_t *release_list_ie;
RANAP_RAB_ReleaseItem_t *rab_release_item;
int rc;
uint8_t rab_id_decoded;
unsigned int index = 0;
while (1) {
release_list_ie = release_item_from_ass_req_ies(ies, index);
if (!release_list_ie)
return -EINVAL;
if (release_list_ie->id != RANAP_ProtocolIE_ID_id_RAB_ReleaseItem) {
RANAP_DEBUG("Decoding failed, the protocol IE is not of type RANAP RAB ReleaseItem!\n");
return -EINVAL;
}
rc = ranap_decode_rab_releaseitemies_fromlist(items_ies, &release_list_ie->value);
if (rc < 0)
return -EINVAL;
rab_release_item = &items_ies->raB_ReleaseItem;
/* The RAB-ID is defined as a bitstring with a size of 8 (1 byte),
* See also RANAP-IEs.asn, RAB-ID ::= BIT STRING (SIZE (8)) */
rab_id_decoded = rab_release_item->rAB_ID.buf[0];
if (rab_id_decoded == rab_id)
return index;
ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_ReleaseItem, items_ies);
index++;
}
}
/*! Extract IP address and port from RANAP_RAB_AssignmentRequestIEs.
* \ptmap[out] addr user provided memory to store extracted RTP stream IP-Address and port number.
* \ptmap[out] rab_id pointer to store RAB-ID (optional, can be NULL).
* \ptmap[in] ies user provided memory with RANAP_RAB_AssignmentRequestIEs.
* \ptmap[in] index index of the SetupOrModifyItem (e.g. 0 for the first list item).
* \returns 0 on success; negative on error. */
int ranap_rab_ass_req_ies_extract_inet_addr(struct osmo_sockaddr *addr, uint8_t *rab_id,
RANAP_RAB_AssignmentRequestIEs_t *ies, unsigned int index)
{
RANAP_ProtocolIE_FieldPair_t *protocol_ie_field_pair;
RANAP_RAB_SetupOrModifyItemFirst_t _rab_setup_or_modify_item_first;
RANAP_RAB_SetupOrModifyItemFirst_t *rab_setup_or_modify_item_first = &_rab_setup_or_modify_item_first;
RANAP_TransportLayerAddress_t *trasp_layer_addr;
RANAP_IuTransportAssociation_t *transp_assoc;
uint16_t port;
int rc;
protocol_ie_field_pair = prot_ie_field_pair_from_ass_req_ies(ies, index);
if (!protocol_ie_field_pair)
return -EINVAL;
if (protocol_ie_field_pair->id != RANAP_ProtocolIE_ID_id_RAB_SetupOrModifyItem) {
RANAP_DEBUG
("Decoding failed, the protocol IE field-pair is not of type RANAP RAB setup-or-modify-item!\n");
return -EINVAL;
}
rc = ranap_decode_rab_setupormodifyitemfirst(rab_setup_or_modify_item_first,
&protocol_ie_field_pair->firstValue);
if (rc < 0)
return -EINVAL;
if (rab_id) {
/* The RAB-ID is defined as a bitstring with a size of 8 (1 byte),
* See also RANAP-IEs.asn, RAB-ID ::= BIT STRING (SIZE (8)) */
*rab_id = rab_setup_or_modify_item_first->rAB_ID.buf[0];
}
/* Decode IP-Address */
trasp_layer_addr = &rab_setup_or_modify_item_first->transportLayerInformation->transportLayerAddress;
rc = ranap_transp_layer_addr_decode2(addr, NULL, trasp_layer_addr);
if (rc < 0) {
rc = -EINVAL;
goto error;
}
/* Decode port number */
transp_assoc = &rab_setup_or_modify_item_first->transportLayerInformation->iuTransportAssociation;
rc = ranap_transp_assoc_decode(&port, transp_assoc);
if (rc < 0) {
rc = -EINVAL;
goto error;
}
switch (addr->u.sin.sin_family) {
case AF_INET:
addr->u.sin.sin_port = htons(port);
break;
case AF_INET6:
addr->u.sin6.sin6_port = htons(port);
break;
default:
rc = -EINVAL;
goto error;
}
rc = 0;
error:
ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_SetupOrModifyItemFirst, rab_setup_or_modify_item_first);
return rc;
}
/*! Extract IP address and port from RANAP_RAB_AssignmentResponseIEs.
* \ptmap[out] addr user provided memory to store extracted RTP stream IP-Address and port number.
* \ptmap[in] ies user provided memory with RANAP_RAB_AssignmentResponseIEs.
* \ptmap[in] rab_id expected rab id to look for.
* \returns 0 on success; negative on error. */
int ranap_rab_ass_resp_ies_extract_inet_addr(struct osmo_sockaddr *addr, RANAP_RAB_AssignmentResponseIEs_t *ies, uint8_t rab_id)
{
RANAP_RAB_SetupOrModifiedItemIEs_t _rab_setup_or_modified_items_ies;
RANAP_RAB_SetupOrModifiedItemIEs_t *rab_setup_or_modified_items_ies = &_rab_setup_or_modified_items_ies;
RANAP_RAB_SetupOrModifiedItem_t *rab_setup_or_modified_item;
uint16_t port;
int rc;
rc = decode_rab_smditms_from_resp_ies(rab_setup_or_modified_items_ies, ies, rab_id);
if (rc < 0)
return -EINVAL;
rab_setup_or_modified_item = &rab_setup_or_modified_items_ies->raB_SetupOrModifiedItem;
/* Decode IP-Address */
rc = ranap_transp_layer_addr_decode2(addr, NULL, rab_setup_or_modified_item->transportLayerAddress);
if (rc < 0) {
rc = -EINVAL;
goto error;
}
/* Decode port number */
rc = ranap_transp_assoc_decode(&port, rab_setup_or_modified_item->iuTransportAssociation);
if (rc < 0) {
rc = -EINVAL;
goto error;
}
switch (addr->u.sin.sin_family) {
case AF_INET:
addr->u.sin.sin_port = htons(port);
break;
case AF_INET6:
addr->u.sin6.sin6_port = htons(port);
break;
default:
rc = -EINVAL;
goto error;
}
rc = 0;
error:
ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_SetupOrModifiedItem, rab_setup_or_modified_items_ies);
return rc;
}
/*! Replace IP address and port in RANAP_RAB_AssignmentRequestIEs.
* \ptmap[inout] ies user provided memory with RANAP_RAB_AssignmentRequestIEs.
* \ptmap[in] addr user provided memory that contains the new RTP stream IP-Address and port number.
* \ptmap[in] rab_id expected rab id to look for.
* \returns 0 on success; negative on error. */
int ranap_rab_ass_req_ies_replace_inet_addr(RANAP_RAB_AssignmentRequestIEs_t *ies, struct osmo_sockaddr *addr, uint8_t rab_id)
{
RANAP_ProtocolIE_FieldPair_t *protocol_ie_field_pair;
RANAP_RAB_SetupOrModifyItemFirst_t _rab_setup_or_modify_item_first;
RANAP_RAB_SetupOrModifyItemFirst_t *rab_setup_or_modify_item_first = &_rab_setup_or_modify_item_first;
RANAP_TransportLayerInformation_t *old_transport_layer_information = NULL;
RANAP_TransportLayerInformation_t *new_transport_layer_information = NULL;
struct osmo_sockaddr addr_old;
bool uses_x213_nsap;
int rc;
int index;
index = decode_rab_smditms_from_req_ies(rab_setup_or_modify_item_first, ies, rab_id);
if (index < 0)
return -EINVAL;
/* Replace transport-layer-information */
if (rab_setup_or_modify_item_first->transportLayerInformation->iuTransportAssociation.present ==
RANAP_IuTransportAssociation_PR_bindingID) {
old_transport_layer_information = rab_setup_or_modify_item_first->transportLayerInformation;
/* Before we can re-encode the transport layer information, we need to know the format it was
* encoded in. */
rc = ranap_transp_layer_addr_decode2(&addr_old, &uses_x213_nsap,
&old_transport_layer_information->transportLayerAddress);
if (rc < 0) {
rc = -EINVAL;
goto error;
}
/* Encode a new transport layer information field */
new_transport_layer_information = ranap_new_transp_info_rtp(addr, uses_x213_nsap);
if (!new_transport_layer_information) {
rc = -EINVAL;
goto error;
}
rab_setup_or_modify_item_first->transportLayerInformation = new_transport_layer_information;
} else {
RANAP_DEBUG("Rewriting transport layer information failed, no bindingID (port)!\n");
rc = -EINVAL;
goto error;
}
/* Reencode transport-layer-information */
protocol_ie_field_pair = prot_ie_field_pair_from_ass_req_ies(ies, index);
rc = ANY_fromType_aper(&protocol_ie_field_pair->firstValue, &asn_DEF_RANAP_RAB_SetupOrModifyItemFirst,
rab_setup_or_modify_item_first);
if (rc < 0) {
RANAP_DEBUG("Rewriting transport layer information failed, could not reencode\n");
rc = -EINVAL;
goto error;
}
error:
/* Restore original state of the modified ASN.1 struct so that the asn1c free mechanisms can work properly */
if (old_transport_layer_information)
rab_setup_or_modify_item_first->transportLayerInformation = old_transport_layer_information;
ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_SetupOrModifyItemFirst, rab_setup_or_modify_item_first);
if (new_transport_layer_information)
ASN_STRUCT_FREE(asn_DEF_RANAP_TransportLayerInformation, new_transport_layer_information);
return rc;
}
/*! Replace IP address and port in RANAP_RAB_AssignmentResponseIEs.
* \ptmap[inout] ies user provided memory with RANAP_RAB_AssignmentResponseIEs.
* \ptmap[in] addr user provided memory that contains the new RTP stream IP-Address and port number.
* \ptmap[in] rab_id expected rab id to look for.
* \returns 0 on success; negative on error. */
int ranap_rab_ass_resp_ies_replace_inet_addr(RANAP_RAB_AssignmentResponseIEs_t *ies, struct osmo_sockaddr *addr, uint8_t rab_id)
{
RANAP_IE_t *setup_or_modified_list_ie;
RANAP_RAB_SetupOrModifiedItemIEs_t _rab_setup_or_modified_items_ies;
RANAP_RAB_SetupOrModifiedItemIEs_t *rab_setup_or_modified_items_ies = &_rab_setup_or_modified_items_ies;
RANAP_RAB_SetupOrModifiedItem_t *rab_setup_or_modified_item;
RANAP_TransportLayerInformation_t *temp_transport_layer_information = NULL;
RANAP_TransportLayerAddress_t *old_transport_layer_address = NULL;
RANAP_IuTransportAssociation_t *old_iu_transport_association = NULL;
struct osmo_sockaddr addr_old;
bool uses_x213_nsap;
int rc;
int index;
index = decode_rab_smditms_from_resp_ies(rab_setup_or_modified_items_ies, ies, rab_id);
if (index < 0)
return -EINVAL;
rab_setup_or_modified_item = &rab_setup_or_modified_items_ies->raB_SetupOrModifiedItem;
/* Before we can re-encode the transport layer address, we need to know the format it was encoded in. */
rc = ranap_transp_layer_addr_decode2(&addr_old, &uses_x213_nsap,
rab_setup_or_modified_item->transportLayerAddress);
if (rc < 0) {
rc = -EINVAL;
goto error;
}
/* Generate a temporary transport layer information, from which we can use the transport layer address and
* the iu transport association to update the setup or modified item */
temp_transport_layer_information = ranap_new_transp_info_rtp(addr, uses_x213_nsap);
if (!temp_transport_layer_information) {
rc = -EINVAL;
goto error;
}
/* Replace transport layer address and iu transport association */
old_transport_layer_address = rab_setup_or_modified_item->transportLayerAddress;
old_iu_transport_association = rab_setup_or_modified_item->iuTransportAssociation;
rab_setup_or_modified_item->transportLayerAddress = &temp_transport_layer_information->transportLayerAddress;
rab_setup_or_modified_item->iuTransportAssociation = &temp_transport_layer_information->iuTransportAssociation;
/* Reencode modified setup or modified list */
setup_or_modified_list_ie = setup_or_modif_item_from_rab_ass_resp(ies, index);
rc = ANY_fromType_aper(&setup_or_modified_list_ie->value, &asn_DEF_RANAP_RAB_SetupOrModifiedItem,
rab_setup_or_modified_items_ies);
if (rc < 0) {
RANAP_DEBUG("Rewriting transport layer address failed, could not reencode\n");
rc = -EINVAL;
goto error;
}
error:
/* Restore original state of the modified ASN.1 struct so that the asn1c free mechanisms can work properly */
if (old_transport_layer_address)
rab_setup_or_modified_item->transportLayerAddress = old_transport_layer_address;
if (old_iu_transport_association)
rab_setup_or_modified_item->iuTransportAssociation = old_iu_transport_association;
if (temp_transport_layer_information)
ASN_STRUCT_FREE(asn_DEF_RANAP_TransportLayerInformation, temp_transport_layer_information);
ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_SetupOrModifiedItem, rab_setup_or_modified_items_ies);
return rc;
}
/*! Check if a specific RAB is present in an RAB-Failed-Item-List inside RANAP_RAB_AssignmentResponseIEs.
* \ptmap[in] ies user provided memory with RANAP_RAB_AssignmentResponseIEs.
* \ptmap[in] rab_id expected rab id to look for.
* \returns true when RAB could be identified as failed; false otherwise */
bool ranap_rab_ass_resp_ies_check_failure(RANAP_RAB_AssignmentResponseIEs_t *ies, uint8_t rab_id)
{
RANAP_RAB_FailedItemIEs_t _rab_failed_items_ies;
RANAP_RAB_FailedItemIEs_t *rab_failed_items_ies = &_rab_failed_items_ies;
int rc;
bool result = true;
/* If we can get a failed item for the specified RAB ID, then we know that the
* HNB reported the RAB Assignment as failed */
rc = decode_rab_flitms_from_resp_ies(rab_failed_items_ies, ies, rab_id);
if (rc < 0)
result = false;
ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_FailedItem, rab_failed_items_ies);
return result;
}
/*! Check if a specific RAB is present in an RAB-ReleaseList inside RANAP_RAB_AssignmentRequestIEs.
* \ptmap[in] ies user provided memory with RANAP_RAB_AssignmentRequestIEs.
* \ptmap[in] rab_id expected rab id to look for.
* \returns true when RAB is intended for release; false otherwise */
bool ranap_rab_ass_req_ies_check_release(RANAP_RAB_AssignmentRequestIEs_t *ies, uint8_t rab_id)
{
RANAP_RAB_ReleaseItemIEs_t _rab_release_items_ies;
RANAP_RAB_ReleaseItemIEs_t *rab_release_items_ies = &_rab_release_items_ies;
int rc;
bool result = true;
/* If we can get a rlease list item for the specified RAB ID, then we know that the
* MSC intends to release the specified RAB */
rc = decode_rab_relitms_from_req_ies(rab_release_items_ies, ies, rab_id);
if (rc < 0)
result = false;
ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_ReleaseItem, rab_release_items_ies);
return result;
}
/*! Find out how many RAB items are present in a RAB-SetupOrModifyList inside RANAP_RAB_AssignmentRequestIEs.
* \ptmap[in] ies user provided memory with RANAP_RAB_AssignmentRequestIEs.
* \returns number of RAB items, -1 on failure. */
int ranap_rab_ass_req_ies_get_count(RANAP_RAB_AssignmentRequestIEs_t *ies)
{
/* Make sure we indeed deal with a setup-or-modify list */
if (!(ies->presenceMask & RAB_ASSIGNMENTREQUESTIES_RANAP_RAB_SETUPORMODIFYLIST_PRESENT)) {
RANAP_DEBUG
("Decoding failed, the RANAP RAB AssignmentRequest did not contain a setup-or-modify list!\n");
return -1;
}
return ies->raB_SetupOrModifyList.list.count;
}