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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/>.
*/
#ifndef OGS_TUN_H
#define OGS_TUN_H
#include "proto/ogs-proto.h"
#ifdef __cplusplus
extern "C" {
#endif
/*
* OGS_TUN_MAX_HEADROOM(16bytes)
*
* Linux
* - ogs_tun_read(16bytes)
* OGS_GTPV1U_5GC_HEADER_LEN(16bytes)
* - ogs_tun_write(0bytes)
* No Need for headroom
*
* Mac OS X
* - ogs_tun_read(12bytes)
* OGS_GTPV1U_5GC_HEADER_LEN(16bytes) - Null/Loopback(4bytes)
* - ogs_tun_write(4bytes)
* Null/Loopback(4bytes)
*
* So, we'll just use 12bytes.
*/
#define OGS_TUN_MAX_HEADROOM 16
ogs_socket_t ogs_tun_open(char *ifname, int maxlen, int is_tap);
int ogs_tun_set_ip(char *ifname, ogs_ipsubnet_t *gw, ogs_ipsubnet_t *sub);
ogs_pkbuf_t *ogs_tun_read(ogs_socket_t fd, ogs_pkbuf_pool_t *packet_pool);
int ogs_tun_write(ogs_socket_t fd, ogs_pkbuf_t *pkbuf);
#ifdef __cplusplus
}
#endif
#endif /* OGS_TUN_H */
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