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/* ssl/dtls1.h */ /* * 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_DTLS1_H # define HEADER_DTLS1_H # include <openssl/buffer.h> # include <openssl/pqueue.h> # ifdef OPENSSL_SYS_VMS # include <resource.h> # include <sys/timeb.h> # endif # ifdef OPENSSL_SYS_WIN32 /* Needed for struct timeval */ # include <winsock.h> # elif defined(OPENSSL_SYS_NETWARE) && !defined(_WINSOCK2API_) # include <sys/timeval.h> # else # if defined(OPENSSL_SYS_VXWORKS) # include <sys/times.h> # else # include <sys/time.h> # endif # endif #ifdef __cplusplus extern "C" { #endif # define DTLS1_VERSION 0xFEFF # define DTLS1_2_VERSION 0xFEFD # define DTLS_MAX_VERSION DTLS1_2_VERSION # define DTLS1_VERSION_MAJOR 0xFE # define DTLS1_BAD_VER 0x0100 /* Special value for method supporting multiple versions */ # define DTLS_ANY_VERSION 0x1FFFF # if 0 /* this alert description is not specified anywhere... */ # define DTLS1_AD_MISSING_HANDSHAKE_MESSAGE 110 # endif /* lengths of messages */ # define DTLS1_COOKIE_LENGTH 256 # define DTLS1_RT_HEADER_LENGTH 13 # define DTLS1_HM_HEADER_LENGTH 12 # define DTLS1_HM_BAD_FRAGMENT -2 # define DTLS1_HM_FRAGMENT_RETRY -3 # define DTLS1_CCS_HEADER_LENGTH 1 # ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE # define DTLS1_AL_HEADER_LENGTH 7 # else # define DTLS1_AL_HEADER_LENGTH 2 # endif # ifndef OPENSSL_NO_SSL_INTERN # ifndef OPENSSL_NO_SCTP # define DTLS1_SCTP_AUTH_LABEL "EXPORTER_DTLS_OVER_SCTP" # endif /* Max MTU overhead we know about so far is 40 for IPv6 + 8 for UDP */ # define DTLS1_MAX_MTU_OVERHEAD 48 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 { EVP_CIPHER_CTX *enc_write_ctx; /* cryptographic state */ EVP_MD_CTX *write_hash; /* used for mac generation */ # ifndef OPENSSL_NO_COMP COMP_CTX *compress; /* compression */ # else char *compress; # endif 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 ccs_header_st { unsigned char type; unsigned short seq; }; 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; }; typedef struct record_pqueue_st { unsigned short epoch; pqueue q; } record_pqueue; typedef struct hm_fragment_st { struct hm_header_st msg_header; unsigned char *fragment; unsigned char *reassembly; } hm_fragment; typedef struct dtls1_state_st { unsigned int send_cookie; unsigned char cookie[DTLS1_COOKIE_LENGTH]; unsigned char rcvd_cookie[DTLS1_COOKIE_LENGTH]; unsigned int cookie_len; /* * The current data and handshake epoch. This is initially * undefined, and starts at zero once the initial handshake is * completed */ unsigned short r_epoch; unsigned short w_epoch; /* 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; /* save last sequence number for retransmissions */ unsigned char last_write_sequence[8]; /* Received handshake records (processed and unprocessed) */ record_pqueue unprocessed_rcds; record_pqueue processed_rcds; /* Buffered handshake messages */ pqueue buffered_messages; /* Buffered (sent) handshake records */ pqueue sent_messages; /* * Buffered application records. Only for records between CCS and * Finished to prevent either protocol violation or unnecessary message * loss. */ record_pqueue buffered_app_data; 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; /* * Indicates when the last handshake msg or heartbeat sent will timeout */ struct timeval next_timeout; /* Timeout duration */ unsigned short timeout_duration; /* * storage for Alert/Handshake protocol data received but not yet * processed by ssl3_read_bytes: */ unsigned char alert_fragment[DTLS1_AL_HEADER_LENGTH]; unsigned int alert_fragment_len; unsigned char handshake_fragment[DTLS1_HM_HEADER_LENGTH]; unsigned int handshake_fragment_len; unsigned int retransmitting; /* * Set when the handshake is ready to process peer's ChangeCipherSpec message. * Cleared after the message has been processed. */ unsigned int change_cipher_spec_ok; /* Is set when listening for new connections with dtls1_listen() */ unsigned int listen; unsigned int link_mtu; /* max on-the-wire DTLS packet size */ # ifndef OPENSSL_NO_SCTP /* used when SSL_ST_XX_FLUSH is entered */ int next_state; int shutdown_received; # endif } DTLS1_STATE; typedef struct dtls1_record_data_st { unsigned char *packet; unsigned int packet_length; SSL3_BUFFER rbuf; SSL3_RECORD rrec; # ifndef OPENSSL_NO_SCTP struct bio_dgram_sctp_rcvinfo recordinfo; # endif } DTLS1_RECORD_DATA; # endif /* Timeout multipliers (timeout slice is defined in apps/timeouts.h */ # define DTLS1_TMO_READ_COUNT 2 # define DTLS1_TMO_WRITE_COUNT 2 # define DTLS1_TMO_ALERT_COUNT 12 #ifdef __cplusplus } #endif #endif