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open5gs/src/sgwu/gtp-path.c

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/*
* Copyright (C) 2019 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 buf[OGS_ADDRSTRLEN];
sgwu_sess_t *sess = NULL;
ogs_pkbuf_t *pkbuf = NULL;
ogs_sockaddr_t from;
ogs_gtp_header_t *gtp_h = NULL;
ogs_pfcp_user_plane_report_t report;
uint32_t teid;
uint8_t qfi;
ogs_assert(fd != INVALID_SOCKET);
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_gtp_header_t *)pkbuf->data;
if (gtp_h->version != OGS_GTP_VERSION_1) {
ogs_error("[DROP] Invalid GTPU version [%d]", gtp_h->version);
ogs_log_hexdump(OGS_LOG_ERROR, pkbuf->data, pkbuf->len);
goto cleanup;
}
if (gtp_h->type == OGS_GTPU_MSGTYPE_ECHO_REQ) {
ogs_pkbuf_t *echo_rsp;
ogs_debug("[RECV] Echo Request from [%s]", OGS_ADDR(&from, buf));
echo_rsp = ogs_gtp_handle_echo_req(pkbuf);
if (echo_rsp) {
ssize_t sent;
/* Echo reply */
ogs_debug("[SEND] Echo Response to [%s]", OGS_ADDR(&from, buf));
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;
}
teid = be32toh(gtp_h->teid);
ogs_debug("[RECV] GPU-U Type [%d] from [%s] : TEID[0x%x]",
gtp_h->type, OGS_ADDR(&from, buf), teid);
qfi = 0;
if (gtp_h->flags & OGS_GTPU_FLAGS_E) {
/*
* TS29.281
* 5.2.1 General format of the GTP-U Extension Header
* Figure 5.2.1-3: Definition of Extension Header Type
*
* Note 4 : For a GTP-PDU with several Extension Headers, the PDU
* Session Container should be the first Extension Header
*/
ogs_gtp_extension_header_t *extension_header =
(ogs_gtp_extension_header_t *)(pkbuf->data + OGS_GTPV1U_HEADER_LEN);
ogs_assert(extension_header);
if (extension_header->type ==
OGS_GTP_EXTENSION_HEADER_TYPE_PDU_SESSION_CONTAINER) {
if (extension_header->pdu_type ==
OGS_GTP_EXTENSION_HEADER_PDU_TYPE_UL_PDU_SESSION_INFORMATION) {
ogs_debug(" QFI [0x%x]",
extension_header->qos_flow_identifier);
qfi = extension_header->qos_flow_identifier;
}
}
}
/* Remove GTP header and send packets to peer NF */
len = ogs_gtpu_header_len(pkbuf);
if (len < 0) {
ogs_error("[DROP] Cannot decode GTPU packet");
ogs_log_hexdump(OGS_LOG_ERROR, pkbuf->data, pkbuf->len);
goto cleanup;
}
ogs_assert(ogs_pkbuf_pull(pkbuf, len));
if (gtp_h->type == OGS_GTPU_MSGTYPE_END_MARKER) {
/* Nothing */
} else if (gtp_h->type == OGS_GTPU_MSGTYPE_ERR_IND) {
ogs_pfcp_far_t *far = NULL;
far = ogs_pfcp_far_find_by_error_indication(pkbuf);
if (far) {
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);
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 (gtp_h->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(teid);
if (!pfcp_object) {
/* TODO : Send Error Indication */
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:
pfcp_sess = (ogs_pfcp_sess_t *)pfcp_object;
ogs_assert(pfcp_sess);
ogs_list_for_each(&pfcp_sess->pdr_list, pdr) {
/* Check if Source Interface */
if (pdr->src_if != OGS_PFCP_INTERFACE_ACCESS &&
pdr->src_if != OGS_PFCP_INTERFACE_CP_FUNCTION)
continue;
/* Check if TEID */
if (teid != pdr->f_teid.teid)
continue;
/* Check if QFI */
if (qfi && pdr->qfi != qfi)
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_pfcp_up_handle_pdr(pdr, 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 = qfi; /* for 5GC */
sgwu_pfcp_send_session_report_request(sess, &report);
}
} else {
ogs_error("[DROP] Invalid GTPU Type [%d]", gtp_h->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;
packet_pool = ogs_pkbuf_pool_create(&config);
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);
ogs_assert(sock);
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_SETUP_GTPU_SERVER;
return OGS_OK;
}
void sgwu_gtp_close(void)
{
ogs_socknode_remove_all(&ogs_gtp_self()->gtpu_list);
}
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