| /* |
| * 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. |
| * |
| * The initial developer of the original code is |
| * Jens Jakobsen <jj@openggsn.org> |
| * |
| * Contributor(s): |
| * |
| */ |
| |
| #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 */ |
| 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 */ |