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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-tun.h"
#undef OGS_LOG_DOMAIN
#define OGS_LOG_DOMAIN __ogs_sock_domain
ogs_pkbuf_t *ogs_tun_read(ogs_socket_t fd, ogs_pkbuf_pool_t *packet_pool)
{
ogs_pkbuf_t *recvbuf = NULL;
int n;
ogs_assert(fd != INVALID_SOCKET);
recvbuf = ogs_pkbuf_alloc(packet_pool, OGS_MAX_PKT_LEN);
ogs_assert(recvbuf);
ogs_pkbuf_reserve(recvbuf, OGS_TUN_MAX_HEADROOM);
ogs_pkbuf_put(recvbuf, OGS_MAX_PKT_LEN-OGS_TUN_MAX_HEADROOM);
n = ogs_read(fd, recvbuf->data, recvbuf->len);
if (n <= 0) {
ogs_log_message(OGS_LOG_WARN, ogs_socket_errno, "ogs_read() failed");
ogs_pkbuf_free(recvbuf);
return NULL;
}
ogs_pkbuf_trim(recvbuf, n);
#if defined(__APPLE__)
/* Remove Null/Loopback Header (4bytes) */
ogs_pkbuf_pull(recvbuf, 4);
#endif
return recvbuf;
}
int ogs_tun_write(ogs_socket_t fd, ogs_pkbuf_t *pkbuf)
{
#if defined(__APPLE__)
uint8_t version;
uint32_t family;
#endif
ogs_assert(fd != INVALID_SOCKET);
ogs_assert(pkbuf);
#if defined(__APPLE__)
version = (*((unsigned char *)pkbuf->data) >> 4) & 0xf;
if (version == 4) {
family = htobe32(AF_INET);
} else if (version == 6) {
family = htobe32(AF_INET6);
} else {
ogs_error("Invalid packet [IP version:%d, Packet Length:%d]",
version, pkbuf->len);
ogs_log_hexdump(OGS_LOG_ERROR, pkbuf->data, pkbuf->len);
return OGS_ERROR;
}
ogs_pkbuf_push(pkbuf, sizeof(family));
memcpy(pkbuf->data, &family, sizeof(family));
#endif
if (ogs_write(fd, pkbuf->data, pkbuf->len) <= 0) {
ogs_log_message(OGS_LOG_ERROR, ogs_socket_errno, "ogs_write() failed");
return OGS_ERROR;
}
return OGS_OK;
}
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