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/* $OpenBSD: message.h,v 1.21 2004/06/20 17:17:35 ho Exp $ */
/* $EOM: message.h,v 1.51 2000/10/10 12:36:39 provos Exp $ */
/*
* Copyright (c) 1998, 1999 Niklas Hallqvist. All rights reserved.
* Copyright (c) 1999 Angelos D. Keromytis. All rights reserved.
* Copyright (c) 2001, 2004 Håkan Olsson. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This code was written under funding by Ericsson Radio Systems.
*/
#ifndef _MESSAGE_H_
#define _MESSAGE_H_
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include "isakmp.h"
struct event;
struct message;
struct proto;
struct sa;
struct transport;
struct payload {
/* Link all payloads of the same type through here. */
TAILQ_ENTRY(payload) link;
/* The pointer to the actual payload data. */
u_int8_t *p;
/*
* A pointer to the parent payload, used for proposal and transform
* payloads.
*/
struct payload *context;
/* Payload flags described below. */
int flags;
};
/* Payload flags. */
/*
* Set this when a payload has been handled, so we later can sweep over
* unhandled ones.
*/
#define PL_MARK 1
/* A post-send chain of functions to be called. */
struct post_send {
/* Link to the next function in the chain. */
TAILQ_ENTRY(post_send) link;
/* The actual function. */
void (*func) (struct message *);
};
struct message {
/* Link message in send queues via this link. */
TAILQ_ENTRY(message) link;
/* Message flags described below. */
u_int flags;
/*
* This is the transport the message either arrived on or will be sent
* to.
*/
struct transport *transport;
/*
* This is the ISAKMP SA protecting this message.
* XXX Needs to be redone to some keystate pointer or something.
*/
struct sa *isakmp_sa;
/* This is the exchange where this message appears. */
struct exchange *exchange;
/*
* A segmented buffer structure holding the messages raw contents. On
* input only segment 0 will be filled, holding all of the message.
* On output, as long as the message body is unencrypted each segment
* will be one payload, after encryption segment 0 will be the
* unencrypted header, and segment 1 will be the encrypted payloads,
* all of them.
*/
struct iovec *iov;
/* The segment count. */
u_int iovlen;
/* Pointer to the last "next payload" field. */
u_int8_t *nextp;
/* "Smart" pointers to each payload, sorted by type. */
TAILQ_HEAD(payload_head, payload) *payload;
/* Number of times this message has been sent. */
int xmits;
/* The timeout event causing retransmission of this message. */
struct event *retrans;
/* The (possibly encrypted) message text, used for duplicate testing. */
u_int8_t *orig;
size_t orig_sz;
/*
* Extra baggage needed to travel with the message. Used transiently
* in context sensitive ways.
*/
void *extra;
/*
* Hooks for stuff needed to be done after the message has gone out to
* the wire.
*/
TAILQ_HEAD(post_send_head, post_send) post_send;
};
/* Message flags. */
/*
* This is the last message of an exchange, meaning it should not be
* retransmitted other than if we see duplicates from our peer's last
* message.
*/
#define MSG_LAST 0x01
/* The message has already been encrypted. */
#define MSG_ENCRYPTED 0x02
/* The message is on the send queue. */
#define MSG_IN_TRANSIT 0x04
/* This message should be kept on the prioritized sendq. */
#define MSG_PRIORITIZED 0x08
/* This message has successfully been authenticated. */
#define MSG_AUTHENTICATED 0x10
TAILQ_HEAD(msg_head, message);
/* The number of different ISAKMP payloads supported. */
extern u_int8_t payload_index_max;
extern int message_add_payload(struct message *, u_int8_t, u_int8_t *,
size_t, int);
extern int message_add_sa_payload(struct message *);
extern struct message *message_alloc(struct transport *, u_int8_t *, size_t);
extern struct message *message_alloc_reply(struct message *);
extern u_int8_t *message_copy(struct message *, size_t, size_t *);
extern void message_drop(struct message *, int, struct proto *, int, int);
extern void message_dump_raw(char *, struct message *, int);
extern void message_free(struct message *);
extern void message_init(void);
extern int message_negotiate_sa(struct message *,
int (*)(struct exchange *, struct sa *, struct sa *));
extern int message_recv(struct message *);
extern int message_register_post_send(struct message *,
void (*) (struct message *));
extern void message_post_send(struct message *);
extern void message_send(struct message *);
extern void message_send_expire(struct message *);
extern void message_send_delete(struct sa *);
extern int message_send_info(struct message *);
extern void message_send_notification(struct message *, struct sa *,
u_int16_t, struct proto *, int);
extern void message_setup_header(struct message *, u_int8_t, u_int8_t,
u_int8_t *);
struct payload *payload_first(struct message *, u_int8_t);
struct payload *payload_last(struct message *, u_int8_t);
#endif /* _MESSAGE_H_ */
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