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/*
* Copyright (C) 2019 by Sukchan Lee <acetcom@gmail.com>
* Copyright (C) 2022 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
* Copyright (C) 2023 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"
ogs_pkbuf_t *ogs_gtp1_handle_echo_req(ogs_pkbuf_t *pkb)
{
ogs_gtp1_header_t *gtph = NULL;
ogs_pkbuf_t *pkb_resp = NULL;
ogs_gtp1_header_t *gtph_resp = NULL;
uint16_t length;
int idx;
ogs_assert(pkb);
gtph = (ogs_gtp1_header_t *)pkb->data;
/* Check GTP version. Now only support GTPv1(version = 1) */
if (gtph->version != 1) {
return NULL;
}
if (gtph->type != OGS_GTP1_ECHO_REQUEST_TYPE) {
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_gtp1_header_t *)pkb_resp->data;
/* reply back immediately */
gtph_resp->version = 1; /* set version */
gtph_resp->pt = 1; /* set PT */
gtph_resp->type = OGS_GTP1_ECHO_RESPONSE_TYPE;
length = 0; /* length of Recovery IE */
gtph_resp->length = htobe16(length); /* to be overwriten */
gtph_resp->teid = 0;
idx = 8;
if (gtph->e || gtph->s || gtph->pn) {
length += 4;
if (gtph->s) {
/* sequence exists */
gtph_resp->s = 1;
*((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->pn) {
/* sequence exists */
gtph_resp->pn = 1;
*((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_gtp1_send_error_message(
ogs_gtp_xact_t *xact, uint32_t teid, uint8_t type, uint8_t cause_value)
{
int rv;
ogs_gtp1_message_t errmsg;
ogs_gtp1_tlv_cause_t *tlv = NULL;
ogs_pkbuf_t *pkbuf = NULL;
memset(&errmsg, 0, sizeof(ogs_gtp1_message_t));
errmsg.h.type = type;
errmsg.h.teid = teid;
switch (type) {
case OGS_GTP1_CREATE_PDP_CONTEXT_RESPONSE_TYPE:
tlv = &errmsg.create_pdp_context_response.cause;
break;
case OGS_GTP1_UPDATE_PDP_CONTEXT_RESPONSE_TYPE:
tlv = &errmsg.update_pdp_context_response.cause;
break;
case OGS_GTP1_DELETE_PDP_CONTEXT_RESPONSE_TYPE:
tlv = &errmsg.delete_pdp_context_response.cause;
break;
default:
ogs_assert_if_reached();
return;
}
ogs_assert(tlv);
tlv->presence = 1;
tlv->u8 = cause_value;
pkbuf = ogs_gtp1_build_msg(&errmsg);
if (!pkbuf) {
ogs_error("ogs_gtp1_build_msg() failed");
return;
}
rv = ogs_gtp1_xact_update_tx(xact, &errmsg.h, pkbuf);
if (rv != OGS_OK) {
ogs_error("ogs_gtp1_xact_update_tx() failed");
return;
}
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
}
void ogs_gtp1_send_echo_request(ogs_gtp_node_t *gnode)
{
int rv;
ogs_pkbuf_t *pkbuf = NULL;
ogs_gtp1_header_t h;
ogs_gtp_xact_t *xact = NULL;
ogs_assert(gnode);
ogs_debug("[GTP] Sending Echo Request");
memset(&h, 0, sizeof(ogs_gtp1_header_t));
h.type = OGS_GTP1_ECHO_REQUEST_TYPE;
h.teid = 0;
pkbuf = ogs_gtp1_build_echo_request(h.type);
if (!pkbuf) {
ogs_error("ogs_gtp1_build_echo_request() failed");
return;
}
xact = ogs_gtp1_xact_local_create(gnode, &h, pkbuf, NULL, NULL);
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
}
void ogs_gtp1_send_echo_response(ogs_gtp_xact_t *xact, uint8_t recovery)
{
int rv;
ogs_pkbuf_t *pkbuf = NULL;
ogs_gtp1_header_t h;
ogs_assert(xact);
ogs_debug("[GTP] Sending Echo Response");
memset(&h, 0, sizeof(ogs_gtp1_header_t));
h.type = OGS_GTP1_ECHO_RESPONSE_TYPE;
h.teid = 0;
pkbuf = ogs_gtp1_build_echo_response(h.type, recovery);
if (!pkbuf) {
ogs_error("ogs_gtp1_build_echo_response() failed");
return;
}
rv = ogs_gtp1_xact_update_tx(xact, &h, pkbuf);
if (rv != OGS_OK) {
ogs_error("ogs_gtp1_xact_update_tx() failed");
return;
}
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
}
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