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/*
* TUN interface functions.
* Copyright (C) 2002, 2003 Mondru AB.
*
* 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
#define PACKET_MAX 8196 /* Maximum packet size we receive */
#define TUN_SCRIPTSIZE 256
#define TUN_ADDRSIZE 128
#define TUN_NLBUFSIZE 1024
struct tun_packet_t {
unsigned int ver:4;
unsigned int ihl:4;
unsigned int dscp:6;
unsigned int ecn:2;
unsigned int length:16;
unsigned int id:16;
unsigned int flags:3;
unsigned int fragment:13;
unsigned int ttl:8;
unsigned int protocol:8;
unsigned int check:16;
unsigned int src:32;
unsigned int dst:32;
};
/* ***********************************************************
* 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);
};
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 in_addr *our_adr,
struct in_addr *his_adr, struct in_addr *net_mask);
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 */
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