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open5gs/src/sgwu/gtp-path.c

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/*
* Copyright (C) 2019-2023 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 "gtp-path.h"
#include "pfcp-path.h"
#define SGWU_GTP_HANDLED 1
static ogs_pkbuf_pool_t *packet_pool = NULL;
static void _gtpv1_u_recv_cb(short when, ogs_socket_t fd, void *data)
{
int len;
ssize_t size;
char buf1[OGS_ADDRSTRLEN];
char buf2[OGS_ADDRSTRLEN];
sgwu_sess_t *sess = NULL;
ogs_pkbuf_t *pkbuf = NULL;
ogs_sock_t *sock = NULL;
ogs_sockaddr_t from;
ogs_gtp2_header_t *gtp_h = NULL;
ogs_gtp2_header_desc_t header_desc;
ogs_pfcp_user_plane_report_t report;
ogs_assert(fd != INVALID_SOCKET);
sock = data;
ogs_assert(sock);
pkbuf = ogs_pkbuf_alloc(packet_pool, OGS_MAX_PKT_LEN);
ogs_assert(pkbuf);
ogs_pkbuf_put(pkbuf, OGS_MAX_PKT_LEN);
size = ogs_recvfrom(fd, pkbuf->data, pkbuf->len, 0, &from);
if (size <= 0) {
ogs_log_message(OGS_LOG_ERROR, ogs_socket_errno,
"ogs_recv() failed");
goto cleanup;
}
ogs_pkbuf_trim(pkbuf, size);
ogs_assert(pkbuf);
ogs_assert(pkbuf->len);
gtp_h = (ogs_gtp2_header_t *)pkbuf->data;
if (gtp_h->version != OGS_GTP2_VERSION_1) {
ogs_error("[DROP] Invalid GTPU version [%d]", gtp_h->version);
ogs_log_hexdump(OGS_LOG_ERROR, pkbuf->data, pkbuf->len);
goto cleanup;
}
len = ogs_gtpu_parse_header(&header_desc, pkbuf);
if (len < 0) {
ogs_error("[DROP] Cannot decode GTPU packet");
ogs_log_hexdump(OGS_LOG_ERROR, pkbuf->data, pkbuf->len);
goto cleanup;
}
if (header_desc.type == OGS_GTPU_MSGTYPE_ECHO_REQ) {
ogs_pkbuf_t *echo_rsp;
ogs_debug("[RECV] Echo Request from [%s]", OGS_ADDR(&from, buf1));
echo_rsp = ogs_gtp2_handle_echo_req(pkbuf);
ogs_expect(echo_rsp);
if (echo_rsp) {
ssize_t sent;
/* Echo reply */
ogs_debug("[SEND] Echo Response to [%s]", OGS_ADDR(&from, buf1));
sent = ogs_sendto(fd, echo_rsp->data, echo_rsp->len, 0, &from);
if (sent < 0 || sent != echo_rsp->len) {
ogs_log_message(OGS_LOG_ERROR, ogs_socket_errno,
"ogs_sendto() failed");
}
ogs_pkbuf_free(echo_rsp);
}
goto cleanup;
}
if (header_desc.type != OGS_GTPU_MSGTYPE_END_MARKER &&
pkbuf->len <= len) {
ogs_error("[DROP] Small GTPU packet(type:%d len:%d)",
header_desc.type, len);
ogs_log_hexdump(OGS_LOG_ERROR, pkbuf->data, pkbuf->len);
goto cleanup;
}
ogs_trace("[RECV] GPU-U Type [%d] from [%s] : TEID[0x%x]",
header_desc.type, OGS_ADDR(&from, buf1), header_desc.teid);
/* Remove GTP header and send packets to peer NF */
ogs_assert(ogs_pkbuf_pull(pkbuf, len));
if (header_desc.type == OGS_GTPU_MSGTYPE_END_MARKER) {
ogs_pfcp_object_t *pfcp_object = NULL;
ogs_pfcp_pdr_t *pdr = NULL;
ogs_gtp2_header_desc_t sendhdr;
ogs_pkbuf_t *sendbuf = NULL;
pfcp_object = ogs_pfcp_object_find_by_teid(header_desc.teid);
if (!pfcp_object) {
/*
* Refer to the following 5G standard
*
* TS23.527 Restoration procedures
* 4.3 UPF Restoration Procedures
* 4.3.2 Restoration Procedure for PSA UPF Restart
*
* The UPF shall not send GTP-U Error indication message
* for a configurable period after an UPF restart
* when the UPF receives a G-PDU not matching any PDRs.
*/
if (ogs_time_ntp32_now() >
(ogs_pfcp_self()->local_recovery +
ogs_time_sec(ogs_local_conf()->time.message.pfcp.
association_interval))) {
ogs_error("[%s] Send Error Indication [TEID:0x%x] to [%s]",
OGS_ADDR(&sock->local_addr, buf1),
header_desc.teid,
OGS_ADDR(&from, buf2));
ogs_gtp1_send_error_indication(
sock, header_desc.teid, 0, &from);
}
goto cleanup;
}
switch(pfcp_object->type) {
case OGS_PFCP_OBJ_PDR_TYPE:
pdr = (ogs_pfcp_pdr_t *)pfcp_object;
ogs_assert(pdr);
break;
default:
ogs_fatal("Unknown type [%d]", pfcp_object->type);
ogs_assert_if_reached();
}
ogs_assert(pdr);
sendbuf = ogs_pkbuf_copy(pkbuf);
ogs_assert(sendbuf);
/* Forward packet */
memset(&sendhdr, 0, sizeof(sendhdr));
sendhdr.type = header_desc.type;
ogs_pfcp_send_g_pdu(pdr, &sendhdr, sendbuf);
} else if (header_desc.type == OGS_GTPU_MSGTYPE_ERR_IND) {
ogs_pfcp_far_t *far = NULL;
far = ogs_pfcp_far_find_by_gtpu_error_indication(pkbuf);
if (far) {
ogs_assert(true ==
ogs_pfcp_up_handle_error_indication(far, &report));
if (report.type.error_indication_report) {
ogs_assert(far->sess);
sess = SGWU_SESS(far->sess);
ogs_assert(sess);
ogs_assert(OGS_OK ==
sgwu_pfcp_send_session_report_request(sess, &report));
}
} else {
ogs_error("[DROP] Cannot find FAR by Error-Indication");
ogs_log_hexdump(OGS_LOG_ERROR, pkbuf->data, pkbuf->len);
}
} else if (header_desc.type == OGS_GTPU_MSGTYPE_GPDU) {
struct ip *ip_h = NULL;
ogs_pfcp_object_t *pfcp_object = NULL;
ogs_pfcp_sess_t *pfcp_sess = NULL;
ogs_pfcp_pdr_t *pdr = NULL;
ip_h = (struct ip *)pkbuf->data;
ogs_assert(ip_h);
pfcp_object = ogs_pfcp_object_find_by_teid(header_desc.teid);
if (!pfcp_object) {
/*
* Refer to the following 5G standard
*
* TS23.527 Restoration procedures
* 4.3 UPF Restoration Procedures
* 4.3.2 Restoration Procedure for PSA UPF Restart
*
* The UPF shall not send GTP-U Error indication message
* for a configurable period after an UPF restart
* when the UPF receives a G-PDU not matching any PDRs.
*/
if (ogs_time_ntp32_now() >
(ogs_pfcp_self()->local_recovery +
ogs_time_sec(ogs_local_conf()->time.message.pfcp.
association_interval))) {
ogs_error("[%s] Send Error Indication [TEID:0x%x] to [%s]",
OGS_ADDR(&sock->local_addr, buf1),
header_desc.teid,
OGS_ADDR(&from, buf2));
ogs_gtp1_send_error_indication(
sock, header_desc.teid, 0, &from);
}
goto cleanup;
}
switch(pfcp_object->type) {
case OGS_PFCP_OBJ_PDR_TYPE:
pdr = (ogs_pfcp_pdr_t *)pfcp_object;
ogs_assert(pdr);
break;
case OGS_PFCP_OBJ_SESS_TYPE:
/* SGWU does not use SESS TYPE */
ogs_assert_if_reached();
pfcp_sess = (ogs_pfcp_sess_t *)pfcp_object;
ogs_assert(pfcp_sess);
ogs_list_for_each(&pfcp_sess->pdr_list, pdr) {
/* Check if TEID */
if (header_desc.teid != pdr->f_teid.teid)
continue;
/* Check if QFI */
if (header_desc.qos_flow_identifier &&
pdr->qfi != header_desc.qos_flow_identifier)
continue;
/* Check if Rule List in PDR */
if (ogs_list_first(&pdr->rule_list) &&
ogs_pfcp_pdr_rule_find_by_packet(pdr, pkbuf) == NULL)
continue;
break;
}
if (!pdr) {
/* TODO : Send Error Indication */
goto cleanup;
}
break;
default:
ogs_fatal("Unknown type [%d]", pfcp_object->type);
ogs_assert_if_reached();
}
ogs_assert(pdr);
ogs_assert(true == ogs_pfcp_up_handle_pdr(
pdr, header_desc.type, &header_desc, pkbuf, &report));
if (report.type.downlink_data_report) {
ogs_assert(pdr->sess);
ogs_assert(pdr->sess->obj.type == OGS_PFCP_OBJ_SESS_TYPE);
sess = SGWU_SESS(pdr->sess);
ogs_assert(sess);
report.downlink_data.pdr_id = pdr->id;
report.downlink_data.qfi =
header_desc.qos_flow_identifier; /* for 5GC */
ogs_assert(OGS_OK ==
sgwu_pfcp_send_session_report_request(sess, &report));
}
} else {
ogs_error("[DROP] Invalid GTPU Type [%d]", header_desc.type);
ogs_log_hexdump(OGS_LOG_ERROR, pkbuf->data, pkbuf->len);
}
cleanup:
ogs_pkbuf_free(pkbuf);
}
int sgwu_gtp_init(void)
{
ogs_pkbuf_config_t config;
memset(&config, 0, sizeof config);
config.cluster_2048_pool = ogs_app()->pool.packet;
#if OGS_USE_TALLOC == 1
/* allocate a talloc pool for GTP to ensure it doesn't have to go back
* to the libc malloc all the time */
packet_pool = talloc_pool(__ogs_talloc_core, 1000*1024);
ogs_assert(packet_pool);
#else
packet_pool = ogs_pkbuf_pool_create(&config);
#endif
return OGS_OK;
}
void sgwu_gtp_final(void)
{
ogs_pkbuf_pool_destroy(packet_pool);
}
int sgwu_gtp_open(void)
{
ogs_socknode_t *node = NULL;
ogs_sock_t *sock = NULL;
ogs_list_for_each(&ogs_gtp_self()->gtpu_list, node) {
sock = ogs_gtp_server(node);
if (!sock) return OGS_ERROR;
if (sock->family == AF_INET)
ogs_gtp_self()->gtpu_sock = sock;
else if (sock->family == AF_INET6)
ogs_gtp_self()->gtpu_sock6 = sock;
node->poll = ogs_pollset_add(ogs_app()->pollset,
OGS_POLLIN, sock->fd, _gtpv1_u_recv_cb, sock);
ogs_assert(node->poll);
}
OGS_SETUP_GTPU_SERVER;
return OGS_OK;
}
void sgwu_gtp_close(void)
{
ogs_socknode_remove_all(&ogs_gtp_self()->gtpu_list);
}
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