/* $OpenBSD: message.h,v 1.30 2024/05/21 05:00:47 jsg 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/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 /* The message was received on the NAT-T port. */ #define MSG_NATT 0x20 /* The message must not be retransmitted. */ #define MSG_DONTRETRANSMIT 0x40 TAILQ_HEAD(msg_head, message); 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 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); extern void message_send_dpd_notify(struct sa*, u_int16_t, u_int32_t); #endif /* _MESSAGE_H_ */
