208 lines
6.4 KiB
C
208 lines
6.4 KiB
C
/* $OpenBSD: message.h,v 1.29 2018/01/15 09:54:48 mpi Exp $ */
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/* $EOM: message.h,v 1.51 2000/10/10 12:36:39 provos Exp $ */
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/*
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* Copyright (c) 1998, 1999 Niklas Hallqvist. All rights reserved.
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* Copyright (c) 1999 Angelos D. Keromytis. All rights reserved.
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* Copyright (c) 2001, 2004 Håkan Olsson. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This code was written under funding by Ericsson Radio Systems.
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*/
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#ifndef _MESSAGE_H_
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#define _MESSAGE_H_
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#include <sys/queue.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include "isakmp.h"
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struct event;
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struct message;
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struct proto;
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struct sa;
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struct transport;
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struct payload {
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/* Link all payloads of the same type through here. */
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TAILQ_ENTRY(payload) link;
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/* The pointer to the actual payload data. */
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u_int8_t *p;
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/*
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* A pointer to the parent payload, used for proposal and transform
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* payloads.
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*/
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struct payload *context;
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/* Payload flags described below. */
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int flags;
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};
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/* Payload flags. */
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/*
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* Set this when a payload has been handled, so we later can sweep over
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* unhandled ones.
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*/
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#define PL_MARK 1
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/* A post-send chain of functions to be called. */
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struct post_send {
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/* Link to the next function in the chain. */
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TAILQ_ENTRY(post_send) link;
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/* The actual function. */
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void (*func) (struct message *);
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};
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struct message {
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/* Link message in send queues via this link. */
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TAILQ_ENTRY(message) link;
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/* Message flags described below. */
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u_int flags;
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/*
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* This is the transport the message either arrived on or will be sent
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* to.
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*/
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struct transport *transport;
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/*
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* This is the ISAKMP SA protecting this message.
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* XXX Needs to be redone to some keystate pointer or something.
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*/
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struct sa *isakmp_sa;
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/* This is the exchange where this message appears. */
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struct exchange *exchange;
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/*
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* A segmented buffer structure holding the messages raw contents. On
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* input only segment 0 will be filled, holding all of the message.
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* On output, as long as the message body is unencrypted each segment
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* will be one payload, after encryption segment 0 will be the
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* unencrypted header, and segment 1 will be the encrypted payloads,
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* all of them.
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*/
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struct iovec *iov;
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/* The segment count. */
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u_int iovlen;
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/* Pointer to the last "next payload" field. */
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u_int8_t *nextp;
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/* "Smart" pointers to each payload, sorted by type. */
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TAILQ_HEAD(payload_head, payload) *payload;
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/* Number of times this message has been sent. */
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int xmits;
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/* The timeout event causing retransmission of this message. */
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struct event *retrans;
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/* The (possibly encrypted) message text, used for duplicate testing. */
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u_int8_t *orig;
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size_t orig_sz;
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/*
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* Extra baggage needed to travel with the message. Used transiently
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* in context sensitive ways.
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*/
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void *extra;
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/*
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* Hooks for stuff needed to be done after the message has gone out to
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* the wire.
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*/
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TAILQ_HEAD(post_send_head, post_send) post_send;
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};
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/* Message flags. */
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/*
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* This is the last message of an exchange, meaning it should not be
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* retransmitted other than if we see duplicates from our peer's last
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* message.
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*/
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#define MSG_LAST 0x01
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/* The message has already been encrypted. */
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#define MSG_ENCRYPTED 0x02
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/* The message is on the send queue. */
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#define MSG_IN_TRANSIT 0x04
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/* This message should be kept on the prioritized sendq. */
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#define MSG_PRIORITIZED 0x08
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/* This message has successfully been authenticated. */
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#define MSG_AUTHENTICATED 0x10
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/* The message was received on the NAT-T port. */
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#define MSG_NATT 0x20
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/* The message must not be retransmitted. */
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#define MSG_DONTRETRANSMIT 0x40
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TAILQ_HEAD(msg_head, message);
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/* The number of different ISAKMP payloads supported. */
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extern u_int8_t payload_index_max;
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extern int message_add_payload(struct message *, u_int8_t, u_int8_t *,
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size_t, int);
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extern int message_add_sa_payload(struct message *);
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extern struct message *message_alloc(struct transport *, u_int8_t *, size_t);
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extern struct message *message_alloc_reply(struct message *);
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extern u_int8_t *message_copy(struct message *, size_t, size_t *);
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extern void message_drop(struct message *, int, struct proto *, int, int);
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extern void message_dump_raw(char *, struct message *, int);
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extern void message_free(struct message *);
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extern void message_init(void);
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extern int message_negotiate_sa(struct message *,
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int (*)(struct exchange *, struct sa *, struct sa *));
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extern int message_recv(struct message *);
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extern int message_register_post_send(struct message *,
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void (*) (struct message *));
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extern void message_post_send(struct message *);
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extern void message_send(struct message *);
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extern void message_send_expire(struct message *);
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extern void message_send_delete(struct sa *);
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extern int message_send_info(struct message *);
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extern void message_send_notification(struct message *, struct sa *,
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u_int16_t, struct proto *, int);
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extern void message_setup_header(struct message *, u_int8_t, u_int8_t,
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u_int8_t *);
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struct payload *payload_first(struct message *, u_int8_t);
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extern void message_send_dpd_notify(struct sa*, u_int16_t, u_int32_t);
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#endif /* _MESSAGE_H_ */
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