2 net.h -- header for net.c
3 Copyright (C) 1998,1999,2000 Ivo Timmermans <zarq@iname.com>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #ifndef __TINC_NET_H__
21 #define __TINC_NET_H__
28 #define MAXSIZE 1700 /* should be a bit more than the MTU for the tapdevice */
31 #define MAC_ADDR_S "%02x:%02x:%02x:%02x:%02x:%02x"
32 #define MAC_ADDR_V(x) ((unsigned char*)&(x))[0],((unsigned char*)&(x))[1], \
33 ((unsigned char*)&(x))[2],((unsigned char*)&(x))[3], \
34 ((unsigned char*)&(x))[4],((unsigned char*)&(x))[5]
36 #define IP_ADDR_S "%d.%d.%d.%d"
38 #ifdef WORDS_BIGENDIAN
39 # define IP_ADDR_V(x) ((unsigned char*)&(x))[0],((unsigned char*)&(x))[1], \
40 ((unsigned char*)&(x))[2],((unsigned char*)&(x))[3]
42 # define IP_ADDR_V(x) ((unsigned char*)&(x))[3],((unsigned char*)&(x))[2], \
43 ((unsigned char*)&(x))[1],((unsigned char*)&(x))[0]
46 #define MAXBUFSIZE 2048 /* Probably way too much, but it must fit every possible request. */
49 #define INDIRECTDATA 0x0001 /* Used to indicate that this host has to be reached indirect */
50 #define EXPORTINDIRECTDATA 0x0002 /* Used to indicate uplink that it has to tell others to do INDIRECTDATA */
52 typedef unsigned long ip_t;
53 typedef short length_t;
55 typedef struct vpn_packet_t {
56 length_t len; /* the actual number of bytes in the `data' field */
57 unsigned char data[MAXSIZE];
60 typedef struct real_packet_t {
61 length_t len; /* the length of the entire packet */
62 ip_t from; /* where the packet came from */
63 vpn_packet_t data; /* encrypted vpn_packet_t */
66 typedef struct passphrase_t {
68 unsigned char *phrase;
71 typedef struct status_bits_t {
72 int pinged:1; /* sent ping */
73 int got_pong:1; /* received pong */
74 int meta:1; /* meta connection exists */
75 int active:1; /* 1 if active.. */
76 int outgoing:1; /* I myself asked for this conn */
77 int termreq:1; /* the termination of this connection was requested */
78 int remove:1; /* Set to 1 if you want this connection removed */
79 int timeout:1; /* 1 if gotten timeout */
80 int validkey:1; /* 1 if we currently have a valid key for him */
81 int waitingforkey:1; /* 1 if we already sent out a request */
82 int dataopen:1; /* 1 if we have a valid UDP connection open */
86 typedef struct queue_element_t {
88 struct queue_element_t *prev;
89 struct queue_element_t *next;
92 typedef struct packet_queue_t {
93 queue_element_t *head;
94 queue_element_t *tail;
97 typedef struct enc_key_t {
103 typedef struct conn_list_t {
104 ip_t vpn_ip; /* his vpn ip */
105 ip_t vpn_mask; /* his vpn network address */
106 ip_t real_ip; /* his real (internet) ip */
107 char *hostname; /* the hostname of its real ip */
108 short unsigned int port; /* his portnumber */
109 int flags; /* his flags */
110 int socket; /* our udp vpn socket */
111 int meta_socket; /* our tcp meta socket */
112 int protocol_version; /* used protocol */
113 status_bits_t status; /* status info */
114 passphrase_t *pp; /* encoded passphrase */
115 packet_queue_t *sq; /* pending outgoing packets */
116 packet_queue_t *rq; /* pending incoming packets (they have no
117 valid key to be decrypted with) */
118 enc_key_t *public_key; /* the other party's public key */
119 enc_key_t *key; /* encrypt with this key */
120 char buffer[MAXBUFSIZE+1]; /* metadata input buffer */
121 int buflen; /* bytes read into buffer */
122 int reqlen; /* length of first request in buffer */
123 time_t last_ping_time; /* last time we saw some activity from the other end */
124 int want_ping; /* 0 if there's no need to check for activity */
125 struct conn_list_t *nexthop; /* nearest meta-hop in this direction */
126 struct conn_list_t *next; /* after all, it's a list of connections */
131 extern int total_tap_in;
132 extern int total_tap_out;
133 extern int total_socket_in;
134 extern int total_socket_out;
136 extern conn_list_t *conn_list;
137 extern conn_list_t *myself;
139 extern int send_packet(ip_t, vpn_packet_t *);
140 extern int setup_network_connections(void);
141 extern void close_network_connections(void);
142 extern void main_loop(void);
143 extern int setup_vpn_connection(conn_list_t *);
144 extern void terminate_connection(conn_list_t *);
145 extern void flush_queues(conn_list_t*);
147 #endif /* __TINC_NET_H__ */