202 lines
5.5 KiB
C
202 lines
5.5 KiB
C
/*
|
|
* 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);
|
|
}
|