forked from acouzens/open5gs
89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
/*
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* Copyright (C) 2019 by Sukchan Lee <acetcom@gmail.com>
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*
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* This file is part of Open5GS.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "ogs-tun.h"
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#undef OGS_LOG_DOMAIN
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#define OGS_LOG_DOMAIN __ogs_sock_domain
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ogs_pkbuf_t *ogs_tun_read(ogs_socket_t fd, ogs_pkbuf_pool_t *packet_pool)
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{
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ogs_pkbuf_t *recvbuf = NULL;
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int n;
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ogs_assert(fd != INVALID_SOCKET);
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recvbuf = ogs_pkbuf_alloc(packet_pool, OGS_MAX_PKT_LEN);
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ogs_assert(recvbuf);
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ogs_pkbuf_reserve(recvbuf, OGS_TUN_MAX_HEADROOM);
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ogs_pkbuf_put(recvbuf, OGS_MAX_PKT_LEN-OGS_TUN_MAX_HEADROOM);
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n = ogs_read(fd, recvbuf->data, recvbuf->len);
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if (n <= 0) {
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ogs_log_message(OGS_LOG_WARN, ogs_socket_errno, "ogs_read() failed");
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ogs_pkbuf_free(recvbuf);
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return NULL;
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}
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ogs_pkbuf_trim(recvbuf, n);
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#if defined(__APPLE__)
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/* Remove Null/Loopback Header (4bytes) */
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ogs_pkbuf_pull(recvbuf, 4);
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#endif
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return recvbuf;
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}
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int ogs_tun_write(ogs_socket_t fd, ogs_pkbuf_t *pkbuf)
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{
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#if defined(__APPLE__)
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uint8_t version;
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uint32_t family;
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#endif
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ogs_assert(fd != INVALID_SOCKET);
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ogs_assert(pkbuf);
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#if defined(__APPLE__)
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version = (*((unsigned char *)pkbuf->data) >> 4) & 0xf;
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if (version == 4) {
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family = htobe32(AF_INET);
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} else if (version == 6) {
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family = htobe32(AF_INET6);
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} else {
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ogs_error("Invalid packet [IP version:%d, Packet Length:%d]",
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version, pkbuf->len);
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ogs_log_hexdump(OGS_LOG_ERROR, pkbuf->data, pkbuf->len);
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return OGS_ERROR;
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}
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ogs_pkbuf_push(pkbuf, sizeof(family));
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memcpy(pkbuf->data, &family, sizeof(family));
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#endif
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if (ogs_write(fd, pkbuf->data, pkbuf->len) <= 0) {
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ogs_log_message(OGS_LOG_ERROR, ogs_socket_errno, "ogs_write() failed");
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return OGS_ERROR;
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}
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return OGS_OK;
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}
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