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open5gs/lib/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 "ogs-gtp.h"
ogs_sock_t *ogs_gtp_server(ogs_socknode_t *node)
{
char buf[OGS_ADDRSTRLEN];
ogs_sock_t *gtp;
ogs_assert(node);
gtp = ogs_udp_server(node);
if (gtp) {
ogs_info("gtp_server() [%s]:%d",
OGS_ADDR(node->addr, buf), OGS_PORT(node->addr));
}
return gtp;
}
int ogs_gtp_connect(ogs_sock_t *ipv4, ogs_sock_t *ipv6, ogs_gtp_node_t *gnode)
{
ogs_sockaddr_t *addr;
char buf[OGS_ADDRSTRLEN];
ogs_assert(ipv4 || ipv6);
ogs_assert(gnode);
ogs_assert(gnode->sa_list);
addr = gnode->sa_list;
while (addr) {
ogs_sock_t *sock = NULL;
if (addr->ogs_sa_family == AF_INET)
sock = ipv4;
else if (addr->ogs_sa_family == AF_INET6)
sock = ipv6;
else
ogs_assert_if_reached();
if (sock) {
ogs_info("gtp_connect() [%s]:%d",
OGS_ADDR(addr, buf), OGS_PORT(addr));
gnode->sock = sock;
memcpy(&gnode->addr, addr, sizeof gnode->addr);
break;
}
addr = addr->next;
}
if (addr == NULL) {
ogs_log_message(OGS_LOG_WARN, ogs_socket_errno,
"gtp_connect() [%s]:%d failed",
OGS_ADDR(gnode->sa_list, buf), OGS_PORT(gnode->sa_list));
return OGS_ERROR;
}
return OGS_OK;
}
int ogs_gtp_send(ogs_gtp_node_t *gnode, ogs_pkbuf_t *pkbuf)
{
ssize_t sent;
ogs_sock_t *sock = NULL;
ogs_assert(gnode);
ogs_assert(pkbuf);
sock = gnode->sock;
ogs_assert(sock);
sent = ogs_send(sock->fd, pkbuf->data, pkbuf->len, 0);
if (sent < 0 || sent != pkbuf->len) {
if (ogs_socket_errno != OGS_EAGAIN) {
ogs_log_message(OGS_LOG_ERROR, ogs_socket_errno,
"ogs_gtp_send() failed");
}
return OGS_ERROR;
}
return OGS_OK;
}
int ogs_gtp_sendto(ogs_gtp_node_t *gnode, ogs_pkbuf_t *pkbuf)
{
ssize_t sent;
ogs_sock_t *sock = NULL;
ogs_sockaddr_t *addr = NULL;
ogs_assert(gnode);
ogs_assert(pkbuf);
sock = gnode->sock;
ogs_assert(sock);
addr = &gnode->addr;
ogs_assert(addr);
sent = ogs_sendto(sock->fd, pkbuf->data, pkbuf->len, 0, addr);
if (sent < 0 || sent != pkbuf->len) {
if (ogs_socket_errno != OGS_EAGAIN) {
ogs_log_message(OGS_LOG_ERROR, ogs_socket_errno,
"ogs_gtp_sendto() failed");
}
return OGS_ERROR;
}
return OGS_OK;
}
int ogs_gtp_send_user_plane(
ogs_gtp_node_t *gnode,
ogs_gtp_header_t *gtp_hdesc, ogs_gtp_extension_header_t *ext_hdesc,
ogs_pkbuf_t *pkbuf)
{
char buf[OGS_ADDRSTRLEN];
int rv;
ogs_gtp_header_t *gtp_h = NULL;
ogs_gtp_extension_header_t *ext_h = NULL;
uint8_t flags;
uint8_t gtp_hlen = 0;
ogs_assert(gnode);
ogs_assert(gtp_hdesc);
ogs_assert(ext_hdesc);
ogs_assert(pkbuf);
/* Processing GTP Flags */
flags = gtp_hdesc->flags;
flags |= OGS_GTPU_FLAGS_V | OGS_GTPU_FLAGS_PT;
if (ext_hdesc->qos_flow_identifier) flags |= OGS_GTPU_FLAGS_E;
/* Define GTP Header Size */
if (flags & OGS_GTPU_FLAGS_E)
gtp_hlen = OGS_GTPV1U_HEADER_LEN+8;
else if (flags & (OGS_GTPU_FLAGS_S|OGS_GTPU_FLAGS_PN))
gtp_hlen = OGS_GTPV1U_HEADER_LEN+4;
else
gtp_hlen = OGS_GTPV1U_HEADER_LEN;
ogs_pkbuf_push(pkbuf, gtp_hlen);
/* Fill GTP Header */
gtp_h = (ogs_gtp_header_t *)pkbuf->data;
ogs_assert(gtp_h);
memset(gtp_h, 0, gtp_hlen);
gtp_h->flags = flags;
gtp_h->type = gtp_hdesc->type;
if (gtp_h->type == OGS_GTPU_MSGTYPE_ECHO_REQ ||
gtp_h->type == OGS_GTPU_MSGTYPE_ECHO_RSP ||
gtp_h->type == OGS_GTPU_MSGTYPE_ERR_IND) {
/*
* TS29.281 5.1 General format in GTP-U header
*
* - The Echo Request/Response and Supported Extension Headers
* notification messages, where the Tunnel Endpoint Identifier
* shall be set to all zeroes.
* - The Error Indication message where the Tunnel Endpoint Identifier
* shall be set to all zeros.
*/
ogs_assert(gtp_hdesc->teid == 0);
}
gtp_h->teid = htobe32(gtp_hdesc->teid);
/*
* TS29.281 5.1 General format in GTP-U header
*
* Length: This field indicates the length in octets of the payload,
* i.e. the rest of the packet following the mandatory part of
* the GTP header (that is the first 8 octets). The Sequence Number,
* the N-PDU Number or any Extension headers shall be considered
* to be part of the payload, i.e. included in the length count.
*/
gtp_h->length = htobe16(pkbuf->len - OGS_GTPV1U_HEADER_LEN);
/* Fill Extention Header */
if (gtp_h->flags & OGS_GTPU_FLAGS_E) {
ext_h = (ogs_gtp_extension_header_t *)
(pkbuf->data + OGS_GTPV1U_HEADER_LEN);
ogs_assert(ext_h);
if (ext_hdesc->qos_flow_identifier) {
/* 5G Core */
ext_h->type = OGS_GTP_EXTENSION_HEADER_TYPE_PDU_SESSION_CONTAINER;
ext_h->len = 1;
ext_h->pdu_type = ext_hdesc->pdu_type;
ext_h->qos_flow_identifier = ext_hdesc->qos_flow_identifier;
ext_h->next_type =
OGS_GTP_EXTENSION_HEADER_TYPE_NO_MORE_EXTENSION_HEADERS;
} else {
/* EPC */
ext_h->type = ext_hdesc->type;
ext_h->len = 1;
ext_h->next_type =
OGS_GTP_EXTENSION_HEADER_TYPE_NO_MORE_EXTENSION_HEADERS;
}
}
ogs_debug("SEND GTP-U[%d] to Peer[%s] : TEID[0x%x]",
gtp_hdesc->type, OGS_ADDR(&gnode->addr, buf), gtp_hdesc->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]",
gtp_hdesc->type, OGS_ADDR(&gnode->addr, buf), gtp_hdesc->teid);
}
}
ogs_pkbuf_free(pkbuf);
return rv;
}
ogs_pkbuf_t *ogs_gtp_handle_echo_req(ogs_pkbuf_t *pkb)
{
ogs_gtp_header_t *gtph = NULL;
ogs_pkbuf_t *pkb_resp = NULL;
ogs_gtp_header_t *gtph_resp = NULL;
uint16_t length;
int idx;
ogs_assert(pkb);
gtph = (ogs_gtp_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 */);
ogs_expect_or_return_val(pkb_resp, NULL);
ogs_pkbuf_put(pkb_resp, 100);
gtph_resp = (ogs_gtp_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_gtp_send_error_message(
ogs_gtp_xact_t *xact, uint32_t teid, uint8_t type, uint8_t cause_value)
{
int rv;
ogs_gtp_message_t errmsg;
ogs_gtp_cause_t cause;
ogs_gtp_tlv_cause_t *tlv = NULL;
ogs_pkbuf_t *pkbuf = NULL;
memset(&errmsg, 0, sizeof(ogs_gtp_message_t));
errmsg.h.teid = teid;
errmsg.h.type = type;
switch (type) {
case OGS_GTP_CREATE_SESSION_RESPONSE_TYPE:
tlv = &errmsg.create_session_response.cause;
break;
case OGS_GTP_MODIFY_BEARER_RESPONSE_TYPE:
tlv = &errmsg.modify_bearer_response.cause;
break;
case OGS_GTP_DELETE_SESSION_RESPONSE_TYPE:
tlv = &errmsg.delete_session_response.cause;
break;
case OGS_GTP_RELEASE_ACCESS_BEARERS_RESPONSE_TYPE:
tlv = &errmsg.release_access_bearers_response.cause;
break;
case OGS_GTP_DOWNLINK_DATA_NOTIFICATION_ACKNOWLEDGE_TYPE:
tlv = &errmsg.downlink_data_notification_acknowledge.cause;
break;
case OGS_GTP_CREATE_BEARER_RESPONSE_TYPE:
tlv = &errmsg.create_bearer_response.cause;
break;
case OGS_GTP_UPDATE_BEARER_RESPONSE_TYPE:
tlv = &errmsg.update_bearer_response.cause;
break;
case OGS_GTP_DELETE_BEARER_RESPONSE_TYPE:
tlv = &errmsg.delete_bearer_response.cause;
break;
case OGS_GTP_CREATE_INDIRECT_DATA_FORWARDING_TUNNEL_RESPONSE_TYPE:
tlv = &errmsg.create_indirect_data_forwarding_tunnel_response.cause;
break;
case OGS_GTP_DELETE_INDIRECT_DATA_FORWARDING_TUNNEL_RESPONSE_TYPE:
tlv = &errmsg.delete_indirect_data_forwarding_tunnel_response.cause;
break;
case OGS_GTP_MODIFY_BEARER_FAILURE_INDICATION_TYPE:
tlv = &errmsg.modify_bearer_failure_indication.cause;
break;
case OGS_GTP_DELETE_BEARER_FAILURE_INDICATION_TYPE:
tlv = &errmsg.delete_bearer_failure_indication.cause;
break;
case OGS_GTP_BEARER_RESOURCE_FAILURE_INDICATION_TYPE:
tlv = &errmsg.bearer_resource_failure_indication.cause;
break;
default:
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_gtp_build_msg(&errmsg);
ogs_expect_or_return(pkbuf);
rv = ogs_gtp_xact_update_tx(xact, &errmsg.h, pkbuf);
ogs_expect_or_return(rv == OGS_OK);
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
}
void ogs_gtp_send_echo_request(
ogs_gtp_node_t *gnode, uint8_t recovery, uint8_t features)
{
int rv;
ogs_pkbuf_t *pkbuf = NULL;
ogs_gtp_header_t h;
ogs_gtp_xact_t *xact = NULL;
ogs_assert(gnode);
ogs_debug("[GTP] Sending Echo Request");
memset(&h, 0, sizeof(ogs_gtp_header_t));
h.type = OGS_GTP_ECHO_REQUEST_TYPE;
h.teid = 0;
pkbuf = ogs_gtp_build_echo_request(h.type, recovery, features);
ogs_expect_or_return(pkbuf);
xact = ogs_gtp_xact_local_create(gnode, &h, pkbuf, NULL, NULL);
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
}
void ogs_gtp_send_echo_response(ogs_gtp_xact_t *xact,
uint8_t recovery, uint8_t features)
{
int rv;
ogs_pkbuf_t *pkbuf = NULL;
ogs_gtp_header_t h;
ogs_assert(xact);
ogs_debug("[GTP] Sending Echo Response");
memset(&h, 0, sizeof(ogs_gtp_header_t));
h.type = OGS_GTP_ECHO_RESPONSE_TYPE;
h.teid = 0;
pkbuf = ogs_gtp_build_echo_response(h.type, recovery, features);
ogs_expect_or_return(pkbuf);
rv = ogs_gtp_xact_update_tx(xact, &h, pkbuf);
ogs_expect_or_return(rv == OGS_OK);
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
}
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