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open5gs/lib/gtp/v2/path.c

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/*
* Copyright (C) 2019-2024 by Sukchan Lee <acetcom@gmail.com>
*
* This file is part of Open5GS.
*
* 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 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 <https://www.gnu.org/licenses/>.
*/
#include "ogs-gtp.h"
int ogs_gtp2_send_user_plane(
ogs_gtp_node_t *gnode,
ogs_gtp2_header_desc_t *header_desc,
ogs_pkbuf_t *pkbuf)
{
char buf[OGS_ADDRSTRLEN];
int rv, i;
ogs_gtp2_header_t gtp_hdesc;
ogs_gtp2_extension_header_t ext_hdesc;
ogs_assert(header_desc);
memset(&gtp_hdesc, 0, sizeof(gtp_hdesc));
memset(&ext_hdesc, 0, sizeof(ext_hdesc));
gtp_hdesc.flags = header_desc->flags;
gtp_hdesc.type = header_desc->type;
gtp_hdesc.teid = header_desc->teid;
i = 0;
if (header_desc->qos_flow_identifier) {
ext_hdesc.array[i].type =
OGS_GTP2_EXTENSION_HEADER_TYPE_PDU_SESSION_CONTAINER;
ext_hdesc.array[i].len = 1;
ext_hdesc.array[i].pdu_type = header_desc->pdu_type;
ext_hdesc.array[i].qos_flow_identifier =
header_desc->qos_flow_identifier;
i++;
}
if (header_desc->udp.presence == true) {
ext_hdesc.array[i].type = OGS_GTP2_EXTENSION_HEADER_TYPE_UDP_PORT;
ext_hdesc.array[i].len = 1;
ext_hdesc.array[i].udp_port = htobe16(header_desc->udp.port);
i++;
}
if (header_desc->pdcp_number_presence == true) {
ext_hdesc.array[i].type = OGS_GTP2_EXTENSION_HEADER_TYPE_PDCP_NUMBER;
ext_hdesc.array[i].len = 1;
ext_hdesc.array[i].pdcp_number = htobe16(header_desc->pdcp_number);
i++;
}
ogs_gtp2_fill_header(&gtp_hdesc, &ext_hdesc, pkbuf);
ogs_trace("SEND GTP-U[%d] to Peer[%s] : TEID[0x%x]",
header_desc->type,
OGS_ADDR(&gnode->addr, buf), header_desc->teid);
rv = ogs_gtp_sendto(gnode, pkbuf);
if (rv != OGS_OK) {
if (ogs_socket_errno != OGS_EAGAIN) {
ogs_error("SEND GTP-U[%d] to Peer[%s] : TEID[0x%x]",
header_desc->type,
OGS_ADDR(&gnode->addr, buf), header_desc->teid);
}
}
ogs_pkbuf_free(pkbuf);
return rv;
}
ogs_pkbuf_t *ogs_gtp2_handle_echo_req(ogs_pkbuf_t *pkb)
{
ogs_gtp2_header_t *gtph = NULL;
ogs_pkbuf_t *pkb_resp = NULL;
ogs_gtp2_header_t *gtph_resp = NULL;
uint16_t length;
int idx;
ogs_assert(pkb);
gtph = (ogs_gtp2_header_t *)pkb->data;
/* Check GTP version. Now only support GTPv1(version = 1) */
if ((gtph->flags >> 5) != 1) {
return NULL;
}
if (gtph->type != OGS_GTPU_MSGTYPE_ECHO_REQ) {
return NULL;
}
pkb_resp = ogs_pkbuf_alloc(NULL,
100 /* enough for ECHO_RSP; use smaller buffer */);
if (!pkb_resp) {
ogs_error("ogs_pkbuf_alloc() failed");
return NULL;
}
ogs_pkbuf_put(pkb_resp, 100);
gtph_resp = (ogs_gtp2_header_t *)pkb_resp->data;
/* reply back immediately */
gtph_resp->flags = (1 << 5); /* set version */
gtph_resp->flags |= (1 << 4); /* set PT */
gtph_resp->type = OGS_GTPU_MSGTYPE_ECHO_RSP;
length = 0; /* length of Recovery IE */
gtph_resp->length = htobe16(length); /* to be overwriten */
gtph_resp->teid = 0;
idx = 8;
if (gtph->flags & (OGS_GTPU_FLAGS_PN | OGS_GTPU_FLAGS_S)) {
length += 4;
if (gtph->flags & OGS_GTPU_FLAGS_S) {
/* sequence exists */
gtph_resp->flags |= OGS_GTPU_FLAGS_S;
*((uint8_t *)pkb_resp->data + idx) = *((uint8_t *)pkb->data + idx);
*((uint8_t *)pkb_resp->data + idx + 1) =
*((uint8_t *)pkb->data + idx + 1);
} else {
*((uint8_t *)pkb_resp->data + idx) = 0;
*((uint8_t *)pkb_resp->data + idx + 1) = 0;
}
idx += 2;
if (gtph->flags & OGS_GTPU_FLAGS_PN) {
/* sequence exists */
gtph_resp->flags |= OGS_GTPU_FLAGS_PN;
*((uint8_t *)pkb_resp->data + idx) = *((uint8_t *)pkb->data + idx);
} else {
*((uint8_t *)pkb_resp->data + idx) = 0;
}
idx++;
*((uint8_t *)pkb_resp->data + idx) = 0; /* next-extension header */
idx++;
}
/* fill Recovery IE */
length += 2;
*((uint8_t *)pkb_resp->data + idx) = 14; idx++; /* type */
*((uint8_t *)pkb_resp->data + idx) = 0; idx++; /* restart counter */
gtph_resp->length = htobe16(length);
ogs_pkbuf_trim(pkb_resp, idx); /* buffer length */
return pkb_resp;
}
void ogs_gtp2_send_error_message(ogs_gtp_xact_t *xact,
int teid_presence, uint32_t teid, uint8_t type, uint8_t cause_value)
{
int rv;
ogs_gtp2_message_t errmsg;
ogs_gtp2_cause_t cause;
ogs_gtp2_tlv_cause_t *tlv = NULL;
ogs_pkbuf_t *pkbuf = NULL;
memset(&errmsg, 0, sizeof(ogs_gtp2_message_t));
errmsg.h.teid_presence = teid_presence;
errmsg.h.teid = teid;
errmsg.h.type = type;
switch (type) {
case OGS_GTP2_CREATE_SESSION_RESPONSE_TYPE:
tlv = &errmsg.create_session_response.cause;
break;
case OGS_GTP2_MODIFY_BEARER_RESPONSE_TYPE:
tlv = &errmsg.modify_bearer_response.cause;
break;
case OGS_GTP2_DELETE_SESSION_RESPONSE_TYPE:
tlv = &errmsg.delete_session_response.cause;
break;
case OGS_GTP2_RELEASE_ACCESS_BEARERS_RESPONSE_TYPE:
tlv = &errmsg.release_access_bearers_response.cause;
break;
case OGS_GTP2_DOWNLINK_DATA_NOTIFICATION_ACKNOWLEDGE_TYPE:
tlv = &errmsg.downlink_data_notification_acknowledge.cause;
break;
case OGS_GTP2_CREATE_BEARER_RESPONSE_TYPE:
tlv = &errmsg.create_bearer_response.cause;
break;
case OGS_GTP2_UPDATE_BEARER_RESPONSE_TYPE:
tlv = &errmsg.update_bearer_response.cause;
break;
case OGS_GTP2_DELETE_BEARER_RESPONSE_TYPE:
tlv = &errmsg.delete_bearer_response.cause;
break;
case OGS_GTP2_CREATE_INDIRECT_DATA_FORWARDING_TUNNEL_RESPONSE_TYPE:
tlv = &errmsg.create_indirect_data_forwarding_tunnel_response.cause;
break;
case OGS_GTP2_DELETE_INDIRECT_DATA_FORWARDING_TUNNEL_RESPONSE_TYPE:
tlv = &errmsg.delete_indirect_data_forwarding_tunnel_response.cause;
break;
case OGS_GTP2_MODIFY_BEARER_FAILURE_INDICATION_TYPE:
tlv = &errmsg.modify_bearer_failure_indication.cause;
break;
case OGS_GTP2_DELETE_BEARER_FAILURE_INDICATION_TYPE:
tlv = &errmsg.delete_bearer_failure_indication.cause;
break;
case OGS_GTP2_BEARER_RESOURCE_FAILURE_INDICATION_TYPE:
tlv = &errmsg.bearer_resource_failure_indication.cause;
break;
default:
ogs_fatal("Invalid message[%d]", type);
ogs_assert_if_reached();
return;
}
ogs_assert(tlv);
memset(&cause, 0, sizeof cause);
cause.value = cause_value;
tlv->presence = 1;
tlv->len = sizeof(cause);
tlv->data = &cause;
pkbuf = ogs_gtp2_build_msg(&errmsg);
if (!pkbuf) {
ogs_error("ogs_gtp2_build_msg() failed");
return;
}
rv = ogs_gtp_xact_update_tx(xact, &errmsg.h, pkbuf);
if (rv != OGS_OK) {
ogs_error("ogs_gtp_xact_update_tx() failed");
return;
}
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
}
void ogs_gtp2_send_echo_request(
ogs_gtp_node_t *gnode, uint8_t recovery, uint8_t features)
{
int rv;
ogs_pkbuf_t *pkbuf = NULL;
ogs_gtp2_header_t h;
ogs_gtp_xact_t *xact = NULL;
ogs_assert(gnode);
ogs_debug("[GTP] Sending Echo Request");
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_ECHO_REQUEST_TYPE;
h.teid_presence = OGS_GTP2_TEID_NO_PRESENCE;
pkbuf = ogs_gtp2_build_echo_request(h.type, recovery, features);
if (!pkbuf) {
ogs_error("ogs_gtp2_build_echo_request() failed");
return;
}
xact = ogs_gtp_xact_local_create(gnode, &h, pkbuf, NULL, NULL);
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
}
void ogs_gtp2_send_echo_response(ogs_gtp_xact_t *xact,
uint8_t recovery, uint8_t features)
{
int rv;
ogs_pkbuf_t *pkbuf = NULL;
ogs_gtp2_header_t h;
ogs_assert(xact);
ogs_debug("[GTP] Sending Echo Response");
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_ECHO_RESPONSE_TYPE;
h.teid_presence = OGS_GTP2_TEID_NO_PRESENCE;
pkbuf = ogs_gtp2_build_echo_response(h.type, recovery, features);
if (!pkbuf) {
ogs_error("ogs_gtp2_build_echo_response() failed");
return;
}
rv = ogs_gtp_xact_update_tx(xact, &h, pkbuf);
if (rv != OGS_OK) {
ogs_error("ogs_gtp_xact_update_tx() failed");
return;
}
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
}
void ogs_gtp1_send_error_indication(
ogs_sock_t *sock, uint32_t teid, uint8_t qfi, const ogs_sockaddr_t *to)
{
ssize_t sent;
ogs_pkbuf_t *pkbuf = NULL;
ogs_gtp2_header_t gtp_hdesc;
ogs_gtp2_extension_header_t ext_hdesc;
int i;
ogs_assert(sock);
ogs_assert(to);
pkbuf = ogs_gtp1_build_error_indication(teid, &sock->local_addr);
if (!pkbuf) {
ogs_error("ogs_gtp1_build_error_indication() failed");
return;
}
memset(&gtp_hdesc, 0, sizeof(gtp_hdesc));
memset(&ext_hdesc, 0, sizeof(ext_hdesc));
gtp_hdesc.type = OGS_GTPU_MSGTYPE_ERR_IND;
gtp_hdesc.flags = OGS_GTPU_FLAGS_S|OGS_GTPU_FLAGS_E;
i = 0;
if (qfi) {
ext_hdesc.array[i].type =
OGS_GTP2_EXTENSION_HEADER_TYPE_PDU_SESSION_CONTAINER;
ext_hdesc.array[i].len = 1;
ext_hdesc.array[i].pdu_type =
OGS_GTP2_EXTENSION_HEADER_PDU_TYPE_DL_PDU_SESSION_INFORMATION;
ext_hdesc.array[i].qos_flow_identifier = qfi;
i++;
}
ext_hdesc.array[i].type = OGS_GTP2_EXTENSION_HEADER_TYPE_UDP_PORT;
ext_hdesc.array[i].len = 1;
ext_hdesc.array[i].udp_port = 0;
ogs_gtp2_fill_header(&gtp_hdesc, &ext_hdesc, pkbuf);
sent = ogs_sendto(sock->fd, pkbuf->data, pkbuf->len, 0, to);
if (sent < 0 || sent != pkbuf->len) {
ogs_log_message(OGS_LOG_ERROR, ogs_socket_errno,
"ogs_sendto() failed");
}
ogs_pkbuf_free(pkbuf);
}
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