/*
    net.h -- header for net.c
    Copyright (C) 1998-2003 Ivo Timmermans <zarq@iname.com>
                  2000-2003 Guus Sliepen <guus@sliepen.eu.org>

    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: net.h,v 1.9.4.73 2003/12/20 19:47:52 guus Exp $
*/

#ifndef __TINC_NET_H__
#define __TINC_NET_H__

#include <openssl/evp.h>

#include "ipv6.h"

#ifdef ENABLE_JUMBOGRAMS
#define MTU 9014				/* 9000 bytes payload + 14 bytes ethernet header */
#else
#define MTU 1514				/* 1500 bytes payload + 14 bytes ethernet header */
#endif

#define MAXSIZE (MTU + 4 + EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + MTU/64 + 20)	/* MTU + seqno + padding + HMAC + compressor overhead */
#define MAXBUFSIZE ((MAXSIZE > 2048 ? MAXSIZE : 2048) + 128)	/* Enough room for a request with a MAXSIZEd packet or a 8192 bits RSA key */

#define MAXSOCKETS 128			/* Overkill... */

#define MAXQUEUELENGTH 8		/* Maximum number of packats in a single queue */

typedef struct mac_t {
	uint8_t x[6];
} mac_t;

typedef struct ipv4_t {
	uint8_t x[4];
} ipv4_t;

typedef struct ipv6_t {
	uint16_t x[8];
} ipv6_t;

typedef short length_t;

#define AF_UNKNOWN 255

struct sockaddr_unknown {
	uint16_t family;
	uint16_t pad1;
	uint32_t pad2;
	char *address;
	char *port;
};

typedef union sockaddr_t {
	struct sockaddr sa;
	struct sockaddr_in in;
	struct sockaddr_in6 in6;
	struct sockaddr_unknown unknown;
#ifdef HAVE_STRUCT_SOCKADDR_STORAGE
	struct sockaddr_storage storage;
#endif
} sockaddr_t;

#ifdef SA_LEN
#define SALEN(s) SA_LEN(&s)
#else
#define SALEN(s) (s.sa_family==AF_INET?sizeof(struct sockaddr_in):sizeof(struct sockaddr_in6))
#endif

typedef struct vpn_packet_t {
	length_t len;				/* the actual number of bytes in the `data' field */
	int priority;				/* priority or TOS */
	uint32_t seqno;				/* 32 bits sequence number (network byte order of course) */
	uint8_t data[MAXSIZE];
} vpn_packet_t;

typedef struct queue_element_t {
	void *packet;
	struct queue_element_t *prev;
	struct queue_element_t *next;
} queue_element_t;

typedef struct packet_queue_t {
	queue_element_t *head;
	queue_element_t *tail;
} packet_queue_t;

typedef struct listen_socket_t {
	int tcp;
	int udp;
	sockaddr_t sa;
} listen_socket_t;

#include "conf.h"

typedef struct outgoing_t {
	char *name;
	int timeout;
	struct config_t *cfg;
	struct addrinfo *ai;
	struct addrinfo *aip;
} outgoing_t;

extern int maxtimeout;
extern int seconds_till_retry;
extern int addressfamily;

extern listen_socket_t listen_socket[MAXSOCKETS];
extern int listen_sockets;
extern int keyexpires;
extern int keylifetime;
extern bool do_prune;
extern bool do_purge;
extern char *myport;
extern time_t now;
extern EVP_CIPHER_CTX packet_ctx;

/* Yes, very strange placement indeed, but otherwise the typedefs get all tangled up */
#include "connection.h"
#include "node.h"

extern void retry_outgoing(outgoing_t *);
extern void handle_incoming_vpn_data(int);
extern void finish_connecting(struct connection_t *);
extern void do_outgoing_connection(struct connection_t *);
extern bool handle_new_meta_connection(int);
extern int setup_listen_socket(const sockaddr_t *);
extern int setup_vpn_in_socket(const sockaddr_t *);
extern void send_packet(const struct node_t *, vpn_packet_t *);
extern void receive_tcppacket(struct connection_t *, char *, int);
extern void broadcast_packet(const struct node_t *, vpn_packet_t *);
extern bool setup_network_connections(void);
extern void setup_outgoing_connection(struct outgoing_t *);
extern void try_outgoing_connections(void);
extern void close_network_connections(void);
extern int main_loop(void);
extern void terminate_connection(struct connection_t *, bool);
extern void flush_queue(struct node_t *);
extern bool read_rsa_public_key(struct connection_t *);
extern void send_mtu_probe(struct node_t *);

#ifndef HAVE_MINGW
#define closesocket(s) close(s)
#endif

#endif							/* __TINC_NET_H__ */