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/* $OpenBSD: dtls_local.h,v 1.2 2022/11/26 17:23:18 tb Exp $ */
/*
* DTLS implementation written by Nagendra Modadugu
* (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
*/
/* ====================================================================
* Copyright (c) 1999-2005 The OpenSSL Project. 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.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED 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 OpenSSL PROJECT OR
* ITS CONTRIBUTORS 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 product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#ifndef HEADER_DTLS_LOCL_H
#define HEADER_DTLS_LOCL_H
#include <sys/time.h>
#include <openssl/dtls1.h>
#include "ssl_local.h"
#include "tls_content.h"
__BEGIN_HIDDEN_DECLS
typedef struct dtls1_bitmap_st {
unsigned long map; /* track 32 packets on 32-bit systems
and 64 - on 64-bit systems */
unsigned char max_seq_num[8]; /* max record number seen so far,
64-bit value in big-endian
encoding */
} DTLS1_BITMAP;
struct dtls1_retransmit_state {
SSL_SESSION *session;
unsigned short epoch;
};
struct hm_header_st {
unsigned char type;
unsigned long msg_len;
unsigned short seq;
unsigned long frag_off;
unsigned long frag_len;
unsigned int is_ccs;
struct dtls1_retransmit_state saved_retransmit_state;
};
struct dtls1_timeout_st {
/* Number of read timeouts so far */
unsigned int read_timeouts;
/* Number of write timeouts so far */
unsigned int write_timeouts;
/* Number of alerts received so far */
unsigned int num_alerts;
};
struct _pqueue;
typedef struct record_pqueue_st {
unsigned short epoch;
struct _pqueue *q;
} record_pqueue;
typedef struct rcontent_pqueue_st {
unsigned short epoch;
struct _pqueue *q;
} rcontent_pqueue;
typedef struct hm_fragment_st {
struct hm_header_st msg_header;
unsigned char *fragment;
unsigned char *reassembly;
} hm_fragment;
typedef struct dtls1_record_data_internal_st {
unsigned char *packet;
unsigned int packet_length;
SSL3_BUFFER_INTERNAL rbuf;
SSL3_RECORD_INTERNAL rrec;
} DTLS1_RECORD_DATA_INTERNAL;
typedef struct dtls1_rcontent_data_internal_st {
struct tls_content *rcontent;
} DTLS1_RCONTENT_DATA_INTERNAL;
struct dtls1_state_st {
/* Buffered (sent) handshake records */
struct _pqueue *sent_messages;
/* Indicates when the last handshake msg or heartbeat sent will timeout */
struct timeval next_timeout;
/* Timeout duration */
unsigned short timeout_duration;
unsigned int send_cookie;
unsigned char cookie[DTLS1_COOKIE_LENGTH];
unsigned char rcvd_cookie[DTLS1_COOKIE_LENGTH];
unsigned int cookie_len;
/* records being received in the current epoch */
DTLS1_BITMAP bitmap;
/* renegotiation starts a new set of sequence numbers */
DTLS1_BITMAP next_bitmap;
/* handshake message numbers */
unsigned short handshake_write_seq;
unsigned short next_handshake_write_seq;
unsigned short handshake_read_seq;
/* Received handshake records (unprocessed) */
record_pqueue unprocessed_rcds;
/* Buffered handshake messages */
struct _pqueue *buffered_messages;
/* Buffered application records.
* Only for records between CCS and Finished
* to prevent either protocol violation or
* unnecessary message loss.
*/
rcontent_pqueue buffered_app_data;
/* Is set when listening for new connections with dtls1_listen() */
unsigned int listen;
unsigned int mtu; /* max DTLS packet size */
struct hm_header_st w_msg_hdr;
struct hm_header_st r_msg_hdr;
struct dtls1_timeout_st timeout;
unsigned int retransmitting;
unsigned int change_cipher_spec_ok;
};
int dtls1_do_write(SSL *s, int type);
int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek);
void dtls1_set_message_header(SSL *s, unsigned char mt, unsigned long len,
unsigned long frag_off, unsigned long frag_len);
void dtls1_set_message_header_int(SSL *s, unsigned char mt,
unsigned long len, unsigned short seq_num, unsigned long frag_off,
unsigned long frag_len);
int do_dtls1_write(SSL *s, int type, const unsigned char *buf,
unsigned int len);
int dtls1_write_app_data_bytes(SSL *s, int type, const void *buf, int len);
int dtls1_write_bytes(SSL *s, int type, const void *buf, int len);
int dtls1_read_failed(SSL *s, int code);
int dtls1_buffer_message(SSL *s, int ccs);
int dtls1_retransmit_message(SSL *s, unsigned short seq,
unsigned long frag_off, int *found);
int dtls1_get_queue_priority(unsigned short seq, int is_ccs);
int dtls1_retransmit_buffered_messages(SSL *s);
void dtls1_clear_record_buffer(SSL *s);
int dtls1_get_message_header(CBS *header, struct hm_header_st *msg_hdr);
void dtls1_reset_read_seq_numbers(SSL *s);
struct timeval* dtls1_get_timeout(SSL *s, struct timeval* timeleft);
int dtls1_check_timeout_num(SSL *s);
int dtls1_handle_timeout(SSL *s);
const SSL_CIPHER *dtls1_get_cipher(unsigned int u);
void dtls1_start_timer(SSL *s);
void dtls1_stop_timer(SSL *s);
int dtls1_is_timer_expired(SSL *s);
void dtls1_double_timeout(SSL *s);
unsigned int dtls1_min_mtu(void);
int dtls1_new(SSL *s);
void dtls1_free(SSL *s);
void dtls1_clear(SSL *s);
long dtls1_ctrl(SSL *s, int cmd, long larg, void *parg);
int dtls1_get_message(SSL *s, int st1, int stn, int mt, long max);
int dtls1_get_record(SSL *s);
__END_HIDDEN_DECLS
#endif /* !HEADER_DTLS_LOCL_H */
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