89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/*
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* TUN interface functions.
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* Copyright (C) 2002, 2003 Mondru AB.
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* Copyright (C) 2017 by Harald Welte <laforge@gnumonks.org>
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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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#include <net/if.h>
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#include "../lib/in46_addr.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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#include "config.h"
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#ifndef HAVE_IPHDR
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struct iphdr
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{
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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unsigned int ihl:4;
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unsigned int version:4;
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#elif __BYTE_ORDER == __BIG_ENDIAN
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unsigned int version:4;
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unsigned int ihl:4;
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#else
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# error "Please fix <bits/endian.h>"
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#endif
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u_int8_t tos;
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u_int16_t tot_len;
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u_int16_t id;
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u_int16_t frag_off;
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u_int8_t ttl;
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u_int8_t protocol;
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u_int16_t check;
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u_int32_t saddr;
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u_int32_t daddr;
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/*The options start here. */
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};
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#endif /* !HAVE_IPHDR */
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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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int routes; /* One if we allocated an automatic route */
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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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/* to be used by libgtp callers/users (to attach their own private state) */
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void *priv;
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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 in46_addr *our_adr,
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struct in46_addr *his_adr, size_t prefixlen);
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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,
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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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