74 lines
2.1 KiB
C
74 lines
2.1 KiB
C
/*
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* TUN interface functions.
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* Copyright (C) 2002, 2003 Mondru AB.
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*
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* The contents of this file may be used under the terms of the GNU
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* General Public License Version 2, provided that the above copyright
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* notice and this permission notice is included in all copies or
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* substantial portions of the software.
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*
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*/
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#ifndef _TUN_H
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#define _TUN_H
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#define PACKET_MAX 8196 /* Maximum packet size we receive */
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#define TUN_SCRIPTSIZE 256
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#define TUN_ADDRSIZE 128
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#define TUN_NLBUFSIZE 1024
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struct tun_packet_t {
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unsigned int ver:4;
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unsigned int ihl:4;
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unsigned int dscp:6;
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unsigned int ecn:2;
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unsigned int length:16;
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unsigned int id:16;
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unsigned int flags:3;
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unsigned int fragment:13;
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unsigned int ttl:8;
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unsigned int protocol:8;
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unsigned int check:16;
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unsigned int src:32;
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unsigned int dst:32;
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};
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/* ***********************************************************
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* Information storage for each tun instance
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*************************************************************/
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struct tun_t {
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int fd; /* File descriptor to tun interface */
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struct in_addr addr;
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struct in_addr dstaddr;
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struct in_addr netmask;
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int addrs; /* Number of allocated IP addresses */
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char devname[IFNAMSIZ];/* Name of the tun device */
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int (*cb_ind) (struct tun_t *tun, void *pack, unsigned len);
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};
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extern int tun_new(struct tun_t **tun);
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extern int tun_free(struct tun_t *tun);
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extern int tun_decaps(struct tun_t *this);
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extern int tun_encaps(struct tun_t *tun, void *pack, unsigned len);
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extern int tun_addaddr(struct tun_t *this, struct in_addr *addr,
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struct in_addr *dstaddr, struct in_addr *netmask);
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extern int tun_setaddr(struct tun_t *this, struct in_addr *our_adr,
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struct in_addr *his_adr, struct in_addr *net_mask);
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int tun_addroute(struct tun_t *this, struct in_addr *dst,
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struct in_addr *gateway, struct in_addr *mask);
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extern int tun_set_cb_ind(struct tun_t *this,
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int (*cb_ind) (struct tun_t *tun, void *pack, unsigned len));
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extern int tun_runscript(struct tun_t *tun, char* script);
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#endif /* !_TUN_H */
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