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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 "ogs-gtp.h"
ogs_pkbuf_t *ogs_gtp2_build_echo_request(
uint8_t type, uint8_t recovery, uint8_t features)
{
ogs_gtp2_message_t gtp_message;
ogs_gtp2_echo_request_t *req = NULL;
req = >p_message.echo_request;
memset(>p_message, 0, sizeof(ogs_gtp2_message_t));
req->recovery.presence = 1;
req->recovery.u8 = recovery;
req->sending_node_features.presence = 1;
req->sending_node_features.u8 = features;
gtp_message.h.type = type;
return ogs_gtp2_build_msg(>p_message);
}
ogs_pkbuf_t *ogs_gtp2_build_echo_response(
uint8_t type, uint8_t recovery, uint8_t features)
{
ogs_gtp2_message_t gtp_message;
ogs_gtp2_echo_response_t *rsp = NULL;
rsp = >p_message.echo_response;
memset(>p_message, 0, sizeof(ogs_gtp2_message_t));
rsp->recovery.presence = 1;
rsp->recovery.u8 = recovery;
rsp->sending_node_features.presence = 1;
rsp->sending_node_features.u8 = features;
gtp_message.h.type = type;
return ogs_gtp2_build_msg(>p_message);
}
ogs_pkbuf_t *ogs_gtp1_build_error_indication(
uint32_t teid, ogs_sockaddr_t *addr)
{
ogs_pkbuf_t *pkbuf = NULL;
unsigned char *p = NULL;
int family;
ogs_assert(addr);
pkbuf = ogs_pkbuf_alloc(
NULL, 100 /* enough for Error Indiciation; use smaller buffer */);
if (!pkbuf) {
ogs_error("ogs_pkbuf_alloc() failed");
return NULL;
}
ogs_pkbuf_reserve(pkbuf,
OGS_GTPV1U_HEADER_LEN + /* 8 bytes */
4 + /* Seq Number(2) + N PDU Number(1) + Ext Header Type(1) */
4 + /* If 5GC, QFI Extension Header(4) */
4); /* UDP Port Extension Header(4) */
/*
* 8.3 Tunnel Endpoint Identifier Data I
*
* Octet 1 : Type = 16 (Decimal)
* Octet 2-5 : Tunnel Endpoint Identitifer Data I
*/
ogs_pkbuf_put_u8(pkbuf, 16);
ogs_pkbuf_put_u32(pkbuf, teid);
/*
* 8.4 GTP-U Peer Address
*
* Octet 1 : Type = 133 (Decimal)
* Octet 2-3 : Length
* Octet 4-n : IPv4 or IPv6 Address
*/
ogs_pkbuf_put_u8(pkbuf, 133);
family = addr->ogs_sa_family;
switch(family) {
case AF_INET:
ogs_pkbuf_put_u16(pkbuf, OGS_IPV4_LEN);
p = ogs_pkbuf_put(pkbuf, OGS_IPV4_LEN);
memcpy(p, &addr->sin.sin_addr, OGS_IPV4_LEN);
break;
case AF_INET6:
ogs_pkbuf_put_u16(pkbuf, OGS_IPV6_LEN);
p = ogs_pkbuf_put(pkbuf, OGS_IPV6_LEN);
memcpy(p, &addr->sin6.sin6_addr, OGS_IPV6_LEN);
break;
default:
ogs_fatal("Unknown family(%d)", family);
ogs_abort();
return NULL;
}
return pkbuf;
}
void ogs_gtp2_fill_header(
ogs_gtp2_header_t *gtp_hdesc, ogs_gtp2_extension_header_t *ext_hdesc,
ogs_pkbuf_t *pkbuf)
{
ogs_gtp2_header_t *gtp_h = NULL;
uint8_t flags;
uint8_t gtp_hlen = 0;
int i;
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->array[0].type && ext_hdesc->array[0].len)
flags |= OGS_GTPU_FLAGS_E;
/* Define GTP Header Size */
if (flags & OGS_GTPU_FLAGS_E) {
gtp_hlen = OGS_GTPV1U_HEADER_LEN+OGS_GTPV1U_EXTENSION_HEADER_LEN;
i = 0;
while(ext_hdesc->array[i].len) {
gtp_hlen += (ext_hdesc->array[i].len*4);
i++;
}
} else if (flags & (OGS_GTPU_FLAGS_S|OGS_GTPU_FLAGS_PN))
gtp_hlen = OGS_GTPV1U_HEADER_LEN+OGS_GTPV1U_EXTENSION_HEADER_LEN;
else
gtp_hlen = OGS_GTPV1U_HEADER_LEN;
ogs_pkbuf_push(pkbuf, gtp_hlen);
/* Fill GTP Header */
gtp_h = (ogs_gtp2_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) {
uint8_t *ext_h = (uint8_t *)(pkbuf->data +
OGS_GTPV1U_HEADER_LEN + OGS_GTPV1U_EXTENSION_HEADER_LEN);
ogs_assert(ext_h);
/* Copy Header Type */
*(ext_h-1) = ext_hdesc->array[0].type;
i = 0;
while (i < OGS_GTP2_NUM_OF_EXTENSION_HEADER &&
(ext_h - pkbuf->data) < gtp_hlen) {
int len = ext_hdesc->array[i].len*4;
/* Copy Header Content */
memcpy(ext_h, &ext_hdesc->array[i].len, len-1);
/* Check if Next Header is Available */
if (ext_hdesc->array[i+1].len)
ext_h[len-1] = ext_hdesc->array[i+1].type;
else
ext_h[len-1] =
OGS_GTP2_EXTENSION_HEADER_TYPE_NO_MORE_EXTENSION_HEADERS;
ext_h += len;
i++;
}
}
}
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