tinc/src/node.h

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/*
node.h -- header for node.c
Copyright (C) 2001-2006 Guus Sliepen <guus@tinc-vpn.org>,
2001-2005 Ivo Timmermans
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This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id$
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*/
#ifndef __TINC_NODE_H__
#define __TINC_NODE_H__
#include "avl_tree.h"
#include "connection.h"
#include "event.h"
#include "list.h"
#include "subnet.h"
typedef struct node_status_t {
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int active:1; /* 1 if active.. */
int validkey:1; /* 1 if we currently have a valid key for him */
int waitingforkey:1; /* 1 if we already sent out a request */
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int visited:1; /* 1 if this node has been visited by one of the graph algorithms */
int reachable:1; /* 1 if this node is reachable in the graph */
int indirect:1; /* 1 if this node is not directly reachable by us */
int unused:26;
} node_status_t;
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typedef struct node_t {
char *name; /* name of this node */
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long int options; /* options turned on for this node */
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sockaddr_t address; /* his real (internet) ip to send UDP packets to */
char *hostname; /* the hostname of its real ip */
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node_status_t status;
const EVP_CIPHER *cipher; /* Cipher type for UDP packets */
char *key; /* Cipher key and iv */
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int keylength; /* Cipher key and iv length */
EVP_CIPHER_CTX packet_ctx; /* Cipher context */
const EVP_MD *digest; /* Digest type for MAC */
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int maclength; /* Length of MAC */
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int compression; /* Compressionlevel, 0 = no compression */
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list_t *queue; /* Queue for packets awaiting to be encrypted */
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struct node_t *nexthop; /* nearest node from us to him */
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struct node_t *via; /* next hop for UDP packets */
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avl_tree_t *subnet_tree; /* Pointer to a tree of subnets belonging to this node */
avl_tree_t *edge_tree; /* Edges with this node as one of the endpoints */
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struct connection_t *connection; /* Connection associated with this node (if a direct connection exists) */
uint32_t sent_seqno; /* Sequence number last sent to this node */
uint32_t received_seqno; /* Sequence number last received from this node */
unsigned char late[16]; /* Bitfield marking late packets */
length_t mtu; /* Maximum size of packets to send to this node */
length_t minmtu; /* Probed minimum MTU */
length_t maxmtu; /* Probed maximum MTU */
int mtuprobes; /* Number of probes */
event_t *mtuevent; /* Probe event */
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} node_t;
extern struct node_t *myself;
extern avl_tree_t *node_tree;
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extern avl_tree_t *node_udp_tree;
extern void init_nodes(void);
extern void exit_nodes(void);
extern node_t *new_node(void) __attribute__ ((__malloc__));
extern void free_node(node_t *);
extern void node_add(node_t *);
extern void node_del(node_t *);
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extern node_t *lookup_node(char *);
extern node_t *lookup_node_udp(const sockaddr_t *);
extern void dump_nodes(void);
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#endif /* __TINC_NODE_H__ */