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ranap_rab_ass: ensure specific rab_id 

The parser functions currently ignore the rab_id. An exception is
ranap_rab_ass_req_ies_extract_inet_addr, which extracts the rab_id
of the first RAB. To make the handling of the RAB assignment parsing
more robust lets add a rab_id parameter to the other functions. This
parameter can then be used to ensure thet the correct RAB is handled.

Change-Id: I2259ffce9f4b508c555d60618c5983ac6294e0ae
Related: OS#5152
This commit is contained in:
Philipp Maier 2022-02-09 18:17:48 +01:00
parent 7daa502a2d
commit 0c465b0f68
4 changed files with 116 additions and 58 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
include/osmocom/hnbgw/ranap_rab_ass.h
View File

@ -6,8 +6,11 @@ int ranap_rab_ass_resp_encode(uint8_t *data, unsigned int len,
RANAP_RAB_AssignmentResponseIEs_t *rab_assignment_response_ies);
int ranap_rab_ass_req_ies_extract_inet_addr(struct osmo_sockaddr *addr, uint8_t *rab_id,
RANAP_RAB_AssignmentRequestIEs_t *ies);
int ranap_rab_ass_resp_ies_extract_inet_addr(struct osmo_sockaddr *addr, RANAP_RAB_AssignmentResponseIEs_t *ies);
RANAP_RAB_AssignmentRequestIEs_t *ies, unsigned int index);
int ranap_rab_ass_resp_ies_extract_inet_addr(struct osmo_sockaddr *addr, RANAP_RAB_AssignmentResponseIEs_t *ies,
uint8_t rab_id);
int ranap_rab_ass_req_ies_replace_inet_addr(RANAP_RAB_AssignmentRequestIEs_t *ies, struct osmo_sockaddr *addr);
int ranap_rab_ass_resp_ies_replace_inet_addr(RANAP_RAB_AssignmentResponseIEs_t *ies, struct osmo_sockaddr *addr);
int ranap_rab_ass_req_ies_replace_inet_addr(RANAP_RAB_AssignmentRequestIEs_t *ies, struct osmo_sockaddr *addr,
uint8_t rab_id);
int ranap_rab_ass_resp_ies_replace_inet_addr(RANAP_RAB_AssignmentResponseIEs_t *ies, struct osmo_sockaddr *addr,
uint8_t rab_id);

138
src/osmo-hnbgw/ranap_rab_ass.c
View File

@ -111,10 +111,9 @@ int ranap_rab_ass_resp_encode(uint8_t *data, unsigned int len,
return rc;
}
/* Pick the first item from the RAB setup-or-modify list and return the first protocol-ie-field-pair. This is based on
* the assumption that a PS call will only assign a signle RAB. This could be different for video calls and IMS but
* those are in practice a corner case, so we go for this simplified assumption for now. */
static RANAP_ProtocolIE_FieldPair_t *prot_ie_field_pair_from_ass_req_ies(const RANAP_RAB_AssignmentRequestIEs_t *ies)
/* 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;
@ -126,14 +125,19 @@ static RANAP_ProtocolIE_FieldPair_t *prot_ie_field_pair_from_ass_req_ies(const R
return NULL;
}
protocol_ie_container_pair = ies->raB_SetupOrModifyList.list.array[0];
/* 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;
}
/* See also comment above prot_ie_field_pair_from_ass_req_ies */
static RANAP_IE_t *setup_or_modif_item_from_rab_ass_resp(const RANAP_RAB_AssignmentResponseIEs_t *ies)
/* 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)) {
@ -142,16 +146,82 @@ static RANAP_IE_t *setup_or_modif_item_from_rab_ass_resp(const RANAP_RAB_Assignm
return NULL;
}
return ies->raB_SetupOrModifiedList.raB_SetupOrModifiedList_ies.list.array[0];
/* 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];
}
/* 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++;
}
}
/* 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;
}
}
/*! 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)
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;
@ -161,7 +231,7 @@ int ranap_rab_ass_req_ies_extract_inet_addr(struct osmo_sockaddr *addr, uint8_t
uint16_t port;
int rc;
protocol_ie_field_pair = prot_ie_field_pair_from_ass_req_ies(ies);
protocol_ie_field_pair = prot_ie_field_pair_from_ass_req_ies(ies, index);
if (!protocol_ie_field_pair)
return -EINVAL;
@ -219,26 +289,20 @@ error:
/*! 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)
int ranap_rab_ass_resp_ies_extract_inet_addr(struct osmo_sockaddr *addr, RANAP_RAB_AssignmentResponseIEs_t *ies, 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;
uint16_t port;
int rc;
setup_or_modified_list_ie = setup_or_modif_item_from_rab_ass_resp(ies);
if (!setup_or_modified_list_ie)
rc = decode_rab_smditms_from_resp_ies(rab_setup_or_modified_items_ies, ies, rab_id);
if (rc < 0)
return -EINVAL;
rc = ranap_decode_rab_setupormodifieditemies_fromlist(rab_setup_or_modified_items_ies,
&setup_or_modified_list_ie->value);
if (rc < 0) {
return -EINVAL;
}
rab_setup_or_modified_item = &rab_setup_or_modified_items_ies->raB_SetupOrModifiedItem;
/* Decode IP-Address */
@ -276,8 +340,9 @@ error:
/*! 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)
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;
@ -287,20 +352,10 @@ int ranap_rab_ass_req_ies_replace_inet_addr(RANAP_RAB_AssignmentRequestIEs_t *ie
struct osmo_sockaddr addr_old;
bool uses_x213_nsap;
int rc;
int index;
protocol_ie_field_pair = prot_ie_field_pair_from_ass_req_ies(ies);
if (!protocol_ie_field_pair)
return -EINVAL;
if (protocol_ie_field_pair->id != RANAP_ProtocolIE_ID_id_RAB_SetupOrModifyItem) {
RANAP_DEBUG("Rewriting transport layer information failed, unexpected IE field-pair type!\n");
return -EINVAL;
}
/* Decode setup-or-modifiy item (first) */
rc = ranap_decode_rab_setupormodifyitemfirst(rab_setup_or_modify_item_first,
&protocol_ie_field_pair->firstValue);
if (rc < 0)
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 */
@ -332,6 +387,7 @@ int ranap_rab_ass_req_ies_replace_inet_addr(RANAP_RAB_AssignmentRequestIEs_t *ie
}
/* 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) {
@ -354,8 +410,9 @@ error:
/*! 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)
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;
@ -367,14 +424,10 @@ int ranap_rab_ass_resp_ies_replace_inet_addr(RANAP_RAB_AssignmentResponseIEs_t *
struct osmo_sockaddr addr_old;
bool uses_x213_nsap;
int rc;
int index;
setup_or_modified_list_ie = setup_or_modif_item_from_rab_ass_resp(ies);
if (!setup_or_modified_list_ie)
return -EINVAL;
rc = ranap_decode_rab_setupormodifieditemies_fromlist(rab_setup_or_modified_items_ies,
&setup_or_modified_list_ie->value);
if (rc < 0)
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;
@ -402,6 +455,7 @@ int ranap_rab_ass_resp_ies_replace_inet_addr(RANAP_RAB_AssignmentResponseIEs_t *
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) {

21
tests/ranap_rab_ass/ranap_rab_ass_test.c
View File

@ -121,7 +121,7 @@ void test_ranap_rab_ass_req_extract_inet_addr(void)
rc = ranap_ran_rx_co_decode(talloc_asn1_ctx, &message, testvec, sizeof(testvec));
OSMO_ASSERT(rc == 0);
rc = ranap_rab_ass_req_ies_extract_inet_addr(&addr, &rab_id, &message.msg.raB_AssignmentRequestIEs);
rc = ranap_rab_ass_req_ies_extract_inet_addr(&addr, &rab_id, &message.msg.raB_AssignmentRequestIEs, 0);
osmo_sockaddr_str_from_sockaddr(&addr_str, &addr.u.sas);
printf("ranap_rab_ass_req_extract_inet_addr rc=%d\n", rc);
printf("RESULT: addr=%s, port=%u, rab-id=%02x\n", addr_str.ip, addr_str.port, rab_id);
@ -145,7 +145,7 @@ void test_ranap_rab_ass_resp_extract_inet_addr(void)
rc = ranap_cn_rx_co_decode(talloc_asn1_ctx, &message, testvec, sizeof(testvec));
OSMO_ASSERT(rc == 0);
rc = ranap_rab_ass_resp_ies_extract_inet_addr(&addr, &message.msg.raB_AssignmentResponseIEs);
rc = ranap_rab_ass_resp_ies_extract_inet_addr(&addr, &message.msg.raB_AssignmentResponseIEs, 7);
osmo_sockaddr_str_from_sockaddr(&addr_str, &addr.u.sas);
printf("ranap_rab_ass_resp_extract_inet_addr rc=%d\n", rc);
printf("RESULT: addr=%s, port=%u\n", addr_str.ip, addr_str.port);
@ -158,6 +158,7 @@ void test_ranap_rab_ass_req_replace_inet_addr(void)
struct osmo_sockaddr addr;
struct osmo_sockaddr_str addr_str;
ranap_message message;
uint8_t rab_id;
uint8_t testvec_in[] = {
0x00, 0x00, 0x00, 0x59, 0x00, 0x00, 0x01, 0x00,
0x36, 0x40, 0x52, 0x00, 0x00, 0x01, 0x00, 0x35,
@ -190,10 +191,10 @@ void test_ranap_rab_ass_req_replace_inet_addr(void)
rc = ranap_ran_rx_co_decode(talloc_asn1_ctx, &message, testvec_in, sizeof(testvec_in));
OSMO_ASSERT(rc == 0);
rc = ranap_rab_ass_req_ies_extract_inet_addr(&addr, NULL, &message.msg.raB_AssignmentRequestIEs);
rc = ranap_rab_ass_req_ies_extract_inet_addr(&addr, &rab_id, &message.msg.raB_AssignmentRequestIEs, 0);
OSMO_ASSERT(rc == 0);
osmo_sockaddr_str_from_sockaddr(&addr_str, &addr.u.sas);
printf("before: addr=%s, port=%u\n", addr_str.ip, addr_str.port);
printf("before: addr=%s, port=%u, rab_id=%u\n", addr_str.ip, addr_str.port, rab_id);
memset(&addr_str, 0, sizeof(addr_str));
addr_str.af = AF_INET;
@ -201,13 +202,13 @@ void test_ranap_rab_ass_req_replace_inet_addr(void)
osmo_strlcpy(addr_str.ip, "1.2.3.4", sizeof(addr_str.ip));
osmo_sockaddr_str_to_sockaddr(&addr_str, &addr.u.sas);
rc = ranap_rab_ass_req_ies_replace_inet_addr(&message.msg.raB_AssignmentRequestIEs, &addr);
rc = ranap_rab_ass_req_ies_replace_inet_addr(&message.msg.raB_AssignmentRequestIEs, &addr, rab_id);
printf("ranap_rab_ass_req_replace_inet_addr rc=%d\n", rc);
rc = ranap_rab_ass_req_ies_extract_inet_addr(&addr, NULL, &message.msg.raB_AssignmentRequestIEs);
rc = ranap_rab_ass_req_ies_extract_inet_addr(&addr, &rab_id, &message.msg.raB_AssignmentRequestIEs, 0);
OSMO_ASSERT(rc == 0);
osmo_sockaddr_str_from_sockaddr(&addr_str, &addr.u.sas);
printf("after: addr=%s, port=%u\n", addr_str.ip, addr_str.port);
printf("after: addr=%s, port=%u, rab_id=%u\n", addr_str.ip, addr_str.port, rab_id);
rc = ranap_rab_ass_req_encode(testvec_in, sizeof(testvec_in), &message.msg.raB_AssignmentRequestIEs);
OSMO_ASSERT(rc == sizeof(testvec_in));
@ -242,7 +243,7 @@ void test_ranap_rab_ass_resp_replace_inet_addr(void)
rc = ranap_cn_rx_co_decode(talloc_asn1_ctx, &message, testvec_in, sizeof(testvec_in));
OSMO_ASSERT(rc == 0);
rc = ranap_rab_ass_resp_ies_extract_inet_addr(&addr, &message.msg.raB_AssignmentResponseIEs);
rc = ranap_rab_ass_resp_ies_extract_inet_addr(&addr, &message.msg.raB_AssignmentResponseIEs, 6);
OSMO_ASSERT(rc == 0);
osmo_sockaddr_str_from_sockaddr(&addr_str, &addr.u.sas);
printf("before: addr=%s, port=%u\n", addr_str.ip, addr_str.port);
@ -253,10 +254,10 @@ void test_ranap_rab_ass_resp_replace_inet_addr(void)
osmo_strlcpy(addr_str.ip, "1.2.3.4", sizeof(addr_str.ip));
osmo_sockaddr_str_to_sockaddr(&addr_str, &addr.u.sas);
rc = ranap_rab_ass_resp_ies_replace_inet_addr(&message.msg.raB_AssignmentResponseIEs, &addr);
rc = ranap_rab_ass_resp_ies_replace_inet_addr(&message.msg.raB_AssignmentResponseIEs, &addr, 6);
printf("ranap_rab_ass_resp_replace_inet_addr rc=%d\n", rc);
rc = ranap_rab_ass_resp_ies_extract_inet_addr(&addr, &message.msg.raB_AssignmentResponseIEs);
rc = ranap_rab_ass_resp_ies_extract_inet_addr(&addr, &message.msg.raB_AssignmentResponseIEs, 6);
OSMO_ASSERT(rc == 0);
osmo_sockaddr_str_from_sockaddr(&addr_str, &addr.u.sas);
printf("after: addr=%s, port=%u\n", addr_str.ip, addr_str.port);

4
tests/ranap_rab_ass/ranap_rab_ass_test.ok
View File

@ -8,9 +8,9 @@ ranap_rab_ass_req_extract_inet_addr rc=0
RESULT: addr=10.9.1.162, port=8054, rab-id=11
ranap_rab_ass_resp_extract_inet_addr rc=0
RESULT: addr=10.9.1.164, port=1034
before: addr=10.9.1.162, port=8122
before: addr=10.9.1.162, port=8122, rab_id=39
ranap_rab_ass_req_replace_inet_addr rc=0
after: addr=1.2.3.4, port=1234
after: addr=1.2.3.4, port=1234, rab_id=39
before: addr=10.9.1.164, port=1034
ranap_rab_ass_resp_replace_inet_addr rc=0
after: addr=1.2.3.4, port=1234