| /* |
| * 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" |
| |
| /* ipv6 ip type flags for tun_ipv6_local_get() */ |
| enum { |
| IP_TYPE_IPv4 = 1, |
| IP_TYPE_IPv6_LINK = 2, |
| IP_TYPE_IPv6_NONLINK = 4, |
| }; |
| #define IP_TYPE_IPv6 (IP_TYPE_IPv6_LINK | IP_TYPE_IPv6_NONLINK) |
| |
| |
| #ifndef HAVE_IPHDR |
| struct iphdr |
| { |
| #if __BYTE_ORDER == __LITTLE_ENDIAN |
| unsigned int ihl:4; |
| unsigned int version:4; |
| #elif __BYTE_ORDER == __BIG_ENDIAN |
| unsigned int version:4; |
| unsigned int ihl:4; |
| #else |
| # error "Please fix <bits/endian.h>" |
| #endif |
| 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, const char *dev_name); |
| 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); |
| |
| int netdev_ip_local_get(const char *devname, struct in46_prefix *prefix_list, |
| size_t prefix_size, int flags); |
| |
| int tun_ip_local_get(const struct tun_t *tun, struct in46_prefix *prefix_list, |
| size_t prefix_size, int flags); |
| |
| #endif /* !_TUN_H */ |