1 /*
2 * Copyright 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *
16 * tun.h - tun device functions
17 */
18 #ifndef __TUN_H__
19 #define __TUN_H__
20
21 #include <fcntl.h>
22 #include <linux/if.h>
23 #include <sys/uio.h>
24 #include <unistd.h>
25
26 #include "common.h"
27 #include "ring.h"
28
29 struct tun_data {
30 char device4[IFNAMSIZ];
31 int read_fd6, write_fd6, fd4;
32 struct packet_ring ring;
33 };
34
35 // tun_open and tun_alloc are defined in tun.c and only used by clatd_microbenchmark.c
36 int tun_open();
37 int tun_alloc(char *dev, int fd, size_t len);
38
39 /* function: send_tun
40 * sends a clat_packet to a tun interface
41 * fd - the tun filedescriptor
42 * out - the packet to send
43 * iov_len - the number of entries in the clat_packet
44 * returns: number of bytes read on success, -1 on failure
45 */
send_tun(int fd,clat_packet out,int iov_len)46 static inline int send_tun(int fd, clat_packet out, int iov_len) {
47 return writev(fd, out, iov_len);
48 }
49
50 #endif
51