tinc/src/node.h

#ifndef TINC_NODE_H
#define TINC_NODE_H

/*
    node.h -- header for node.c
    Copyright (C) 2001-2016 Guus Sliepen <guus@tinc-vpn.org>,
                  2001-2005 Ivo Timmermans

    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.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "avl_tree.h"
#include "connection.h"
#include "event.h"
#include "subnet.h"

typedef struct node_status_t {
	unsigned int unused_active: 1;          /* 1 if active (not used for nodes) */
	unsigned int validkey: 1;               /* 1 if we currently have a valid key for him */
	unsigned int unused_waitingforkey: 1;   /* 1 if we already sent out a request */
	unsigned int visited: 1;                /* 1 if this node has been visited by one of the graph algorithms */
	unsigned int reachable: 1;              /* 1 if this node is reachable in the graph */
	unsigned int indirect: 1;               /* 1 if this node is not directly reachable by us */
	unsigned int unused: 26;
} node_status_t;

typedef struct node_t {
	char *name;                             /* name of this node */
	uint32_t options;                       /* options turned on for this node */

	int sock;                               /* Socket to use for outgoing UDP packets */
	sockaddr_t address;                     /* his real (internet) ip to send UDP packets to */
	char *hostname;                         /* the hostname of its real ip */

	node_status_t status;
	time_t last_req_key;

	const EVP_CIPHER *incipher;             /* Cipher type for UDP packets received from him */
	char *inkey;                            /* Cipher key and iv */
	int inkeylength;                        /* Cipher key and iv length */
	EVP_CIPHER_CTX *inctx;                  /* Cipher context */

	const EVP_CIPHER *outcipher;            /* Cipher type for UDP packets sent to him*/
	char *outkey;                           /* Cipher key and iv */
	int outkeylength;                       /* Cipher key and iv length */
	EVP_CIPHER_CTX *outctx;                 /* Cipher context */

	const EVP_MD *indigest;                 /* Digest type for MAC of packets received from him */
	int inmaclength;                        /* Length of MAC */

	const EVP_MD *outdigest;                /* Digest type for MAC of packets sent to him*/
	int outmaclength;                       /* Length of MAC */

	int incompression;                      /* Compressionlevel, 0 = no compression */
	int outcompression;                     /* Compressionlevel, 0 = no compression */

	struct node_t *nexthop;                 /* nearest node from us to him */
	struct edge_t *prevedge;                /* nearest node from him to us */
	struct node_t *via;                     /* next hop for UDP packets */

	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 */

	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 */
	uint32_t farfuture;                     /* Packets in a row that have arrived from the far future */
	unsigned char *late;                    /* 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 */
} node_t;

extern struct node_t *myself;
extern avl_tree_t *node_tree;
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 *n);
extern void node_add(node_t *n);
extern void node_del(node_t *n);
extern node_t *lookup_node(char *name);
extern node_t *lookup_node_udp(const sockaddr_t *sa);
extern void update_node_udp(node_t *n, const sockaddr_t *sa);
extern void dump_nodes(void);

#endif