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* TUN interface functions.
* Copyright (C) 2002, 2003 Mondru AB.
* Copyright (C) 2017 by Harald Welte <laforge@gnumonks.org>
* The contents of this file may be used under the terms of the GNU
* General Public License Version 2, provided that the above copyright
* notice and this permission notice is included in all copies or
* substantial portions of the software.
#ifndef _TUN_H
#define _TUN_H
#include <net/if.h>
#include "../lib/in46_addr.h"
#define PACKET_MAX 8196 /* Maximum packet size we receive */
#define TUN_SCRIPTSIZE 256
#define TUN_ADDRSIZE 128
#define TUN_NLBUFSIZE 1024
#include "config.h"
#ifndef HAVE_IPHDR
struct iphdr
unsigned int ihl:4;
unsigned int version:4;
unsigned int version:4;
unsigned int ihl:4;
# error "Please fix <bits/endian.h>"
u_int8_t tos;
u_int16_t tot_len;
u_int16_t id;
u_int16_t frag_off;
u_int8_t ttl;
u_int8_t protocol;
u_int16_t check;
u_int32_t saddr;
u_int32_t daddr;
/*The options start here. */
#endif /* !HAVE_IPHDR */
/* ***********************************************************
* Information storage for each tun instance
struct tun_t {
int fd; /* File descriptor to tun interface */
struct in_addr addr;
struct in_addr dstaddr;
struct in_addr netmask;
int addrs; /* Number of allocated IP addresses */
int routes; /* One if we allocated an automatic route */
char devname[IFNAMSIZ]; /* Name of the tun device */
int (*cb_ind) (struct tun_t * tun, void *pack, unsigned len);
/* to be used by libgtp callers/users (to attach their own private state) */
void *priv;
extern int tun_new(struct tun_t **tun);
extern int tun_free(struct tun_t *tun);
extern int tun_decaps(struct tun_t *this);
extern int tun_encaps(struct tun_t *tun, void *pack, unsigned len);
extern int tun_addaddr(struct tun_t *this, struct in_addr *addr,
struct in_addr *dstaddr, struct in_addr *netmask);
extern int tun_setaddr(struct tun_t *this, struct in46_addr *our_adr,
struct in46_addr *his_adr, size_t prefixlen);
int tun_addroute(struct tun_t *this, struct in_addr *dst,
struct in_addr *gateway, struct in_addr *mask);
extern int tun_set_cb_ind(struct tun_t *this,
int (*cb_ind) (struct tun_t * tun, void *pack,
unsigned len));
extern int tun_runscript(struct tun_t *tun, char *script);
#endif /* !_TUN_H */