FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_constants.h

     /*-
      * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions are met:
      *
      * a) Redistributions of source code must retain the above copyright notice,
      *   this list of conditions and the following disclaimer.
      *
     * b) 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.
     *
     * c) Neither the name of Cisco Systems, Inc. nor the names of its
     *    contributors may be used to endorse or promote products derived
     *    from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     * "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 COPYRIGHT OWNER OR 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.
     */
    
    /* $KAME: sctp_constants.h,v 1.17 2005/03/06 16:04:17 itojun Exp $       */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #ifndef __sctp_constants_h__
    #define __sctp_constants_h__
    
    /* IANA assigned port number for SCTP over UDP encapsulation */
    #define SCTP_OVER_UDP_TUNNELING_PORT 9899
    
    /* Number of packets to get before sack sent by default */
    #define SCTP_DEFAULT_SACK_FREQ 2
    
    /* Address limit - This variable is calculated
     * based on an 65535 byte max ip packet. We take out 100 bytes
     * for the cookie, 40 bytes for a v6 header and 32
     * bytes for the init structure. A second init structure
     * for the init-ack and then finally a third one for the
     * imbedded init. This yeilds 100+40+(3 * 32) = 236 bytes.
     * This leaves 65299 bytes for addresses. We throw out the 299 bytes.
     * Now whatever we send in the INIT() we need to allow to get back in the
     * INIT-ACK plus all the values from INIT and INIT-ACK
     * listed in the cookie. Plus we need some overhead for
     * maybe copied parameters in the COOKIE. If we
     * allow 1080 addresses, and each side has 1080 V6 addresses
     * that will be 21600 bytes. In the INIT-ACK we will
     * see the INIT-ACK 21600 + 43200 in the cookie. This leaves
     * about 500 bytes slack for misc things in the cookie.
     */
    #define SCTP_ADDRESS_LIMIT 1080
    
    /* We need at least 2k of space for us, inits
     * larger than that lets abort.
     */
    #define SCTP_LARGEST_INIT_ACCEPTED (65535 - 2048)
    
    /* Number of addresses where we just skip the counting */
    #define SCTP_COUNT_LIMIT 40
    
    #define SCTP_ZERO_COPY_TICK_DELAY (((100 * hz) + 999) / 1000)
    #define SCTP_ZERO_COPY_SENDQ_TICK_DELAY (((100 * hz) + 999) / 1000)
    
    /* Number of ticks to delay before running
     * iterator on an address change.
     */
    #define SCTP_ADDRESS_TICK_DELAY 2
    
    #define SCTP_VERSION_STRING "KAME-BSD 1.1"
    /* #define SCTP_AUDITING_ENABLED 1 used for debug/auditing */
    #define SCTP_AUDIT_SIZE 256
    
    #define SCTP_USE_THREAD_BASED_ITERATOR 1
    
    #define SCTP_KTRHEAD_NAME "sctp_iterator"
    #define SCTP_KTHREAD_PAGES 2
    
    
    /* If you support Multi-VRF how big to
     * make the initial array of VRF's to.
     */
    #define SCTP_DEFAULT_VRF_SIZE 4
    
    /* constants for rto calc */
    #define sctp_align_safe_nocopy 0
    #define sctp_align_unsafe_makecopy 1
    
    /* JRS - Values defined for the HTCP algorithm */
    #define ALPHA_BASE      (1<<7)  /* 1.0 with shift << 7 */
   #define BETA_MIN        (1<<6)  /* 0.5 with shift << 7 */
   #define BETA_MAX        102     /* 0.8 with shift << 7 */
   
   /* Places that CWND log can happen from */
   #define SCTP_CWND_LOG_FROM_FR   1
   #define SCTP_CWND_LOG_FROM_RTX  2
   #define SCTP_CWND_LOG_FROM_BRST 3
   #define SCTP_CWND_LOG_FROM_SS   4
   #define SCTP_CWND_LOG_FROM_CA   5
   #define SCTP_CWND_LOG_FROM_SAT  6
   #define SCTP_BLOCK_LOG_INTO_BLK 7
   #define SCTP_BLOCK_LOG_OUTOF_BLK 8
   #define SCTP_BLOCK_LOG_CHECK     9
   #define SCTP_STR_LOG_FROM_INTO_STRD 10
   #define SCTP_STR_LOG_FROM_IMMED_DEL 11
   #define SCTP_STR_LOG_FROM_INSERT_HD 12
   #define SCTP_STR_LOG_FROM_INSERT_MD 13
   #define SCTP_STR_LOG_FROM_INSERT_TL 14
   #define SCTP_STR_LOG_FROM_MARK_TSN  15
   #define SCTP_STR_LOG_FROM_EXPRS_DEL 16
   #define SCTP_FR_LOG_BIGGEST_TSNS    17
   #define SCTP_FR_LOG_STRIKE_TEST     18
   #define SCTP_FR_LOG_STRIKE_CHUNK    19
   #define SCTP_FR_T3_TIMEOUT          20
   #define SCTP_MAP_PREPARE_SLIDE      21
   #define SCTP_MAP_SLIDE_FROM         22
   #define SCTP_MAP_SLIDE_RESULT       23
   #define SCTP_MAP_SLIDE_CLEARED      24
   #define SCTP_MAP_SLIDE_NONE         25
   #define SCTP_FR_T3_MARK_TIME        26
   #define SCTP_FR_T3_MARKED           27
   #define SCTP_FR_T3_STOPPED          28
   #define SCTP_FR_MARKED              30
   #define SCTP_CWND_LOG_NOADV_SS      31
   #define SCTP_CWND_LOG_NOADV_CA      32
   #define SCTP_MAX_BURST_APPLIED      33
   #define SCTP_MAX_IFP_APPLIED        34
   #define SCTP_MAX_BURST_ERROR_STOP   35
   #define SCTP_INCREASE_PEER_RWND     36
   #define SCTP_DECREASE_PEER_RWND     37
   #define SCTP_SET_PEER_RWND_VIA_SACK 38
   #define SCTP_LOG_MBCNT_INCREASE     39
   #define SCTP_LOG_MBCNT_DECREASE     40
   #define SCTP_LOG_MBCNT_CHKSET       41
   #define SCTP_LOG_NEW_SACK           42
   #define SCTP_LOG_TSN_ACKED          43
   #define SCTP_LOG_TSN_REVOKED        44
   #define SCTP_LOG_LOCK_TCB           45
   #define SCTP_LOG_LOCK_INP           46
   #define SCTP_LOG_LOCK_SOCK          47
   #define SCTP_LOG_LOCK_SOCKBUF_R     48
   #define SCTP_LOG_LOCK_SOCKBUF_S     49
   #define SCTP_LOG_LOCK_CREATE        50
   #define SCTP_LOG_INITIAL_RTT        51
   #define SCTP_LOG_RTTVAR             52
   #define SCTP_LOG_SBALLOC            53
   #define SCTP_LOG_SBFREE             54
   #define SCTP_LOG_SBRESULT           55
   #define SCTP_FR_DUPED               56
   #define SCTP_FR_MARKED_EARLY        57
   #define SCTP_FR_CWND_REPORT         58
   #define SCTP_FR_CWND_REPORT_START   59
   #define SCTP_FR_CWND_REPORT_STOP    60
   #define SCTP_CWND_LOG_FROM_SEND     61
   #define SCTP_CWND_INITIALIZATION    62
   #define SCTP_CWND_LOG_FROM_T3       63
   #define SCTP_CWND_LOG_FROM_SACK     64
   #define SCTP_CWND_LOG_NO_CUMACK     65
   #define SCTP_CWND_LOG_FROM_RESEND   66
   #define SCTP_FR_LOG_CHECK_STRIKE    67
   #define SCTP_SEND_NOW_COMPLETES     68
   #define SCTP_CWND_LOG_FILL_OUTQ_CALLED 69
   #define SCTP_CWND_LOG_FILL_OUTQ_FILLS  70
   #define SCTP_LOG_FREE_SENT             71
   #define SCTP_NAGLE_APPLIED          72
   #define SCTP_NAGLE_SKIPPED          73
   #define SCTP_WAKESND_FROM_SACK      74
   #define SCTP_WAKESND_FROM_FWDTSN    75
   #define SCTP_NOWAKE_FROM_SACK       76
   #define SCTP_CWNDLOG_PRESEND        77
   #define SCTP_CWNDLOG_ENDSEND        78
   #define SCTP_AT_END_OF_SACK         79
   #define SCTP_REASON_FOR_SC          80
   #define SCTP_BLOCK_LOG_INTO_BLKA    81
   #define SCTP_ENTER_USER_RECV        82
   #define SCTP_USER_RECV_SACKS        83
   #define SCTP_SORECV_BLOCKSA         84
   #define SCTP_SORECV_BLOCKSB         85
   #define SCTP_SORECV_DONE            86
   #define SCTP_SACK_RWND_UPDATE       87
   #define SCTP_SORECV_ENTER           88
   #define SCTP_SORECV_ENTERPL         89
   #define SCTP_MBUF_INPUT             90
   #define SCTP_MBUF_IALLOC            91
   #define SCTP_MBUF_IFREE             92
   #define SCTP_MBUF_ICOPY             93
   #define SCTP_MBUF_SPLIT             94
   #define SCTP_SORCV_FREECTL          95
   #define SCTP_SORCV_DOESCPY          96
   #define SCTP_SORCV_DOESLCK          97
   #define SCTP_SORCV_DOESADJ          98
   #define SCTP_SORCV_BOTWHILE         99
   #define SCTP_SORCV_PASSBF          100
   #define SCTP_SORCV_ADJD            101
   #define SCTP_UNKNOWN_MAX           102
   #define SCTP_RANDY_STUFF           103
   #define SCTP_RANDY_STUFF1          104
   #define SCTP_STRMOUT_LOG_ASSIGN    105
   #define SCTP_STRMOUT_LOG_SEND      106
   #define SCTP_FLIGHT_LOG_DOWN_CA    107
   #define SCTP_FLIGHT_LOG_UP         108
   #define SCTP_FLIGHT_LOG_DOWN_GAP   109
   #define SCTP_FLIGHT_LOG_DOWN_RSND  110
   #define SCTP_FLIGHT_LOG_UP_RSND    111
   #define SCTP_FLIGHT_LOG_DOWN_RSND_TO    112
   #define SCTP_FLIGHT_LOG_DOWN_WP    113
   #define SCTP_FLIGHT_LOG_UP_REVOKE  114
   #define SCTP_FLIGHT_LOG_DOWN_PDRP  115
   #define SCTP_FLIGHT_LOG_DOWN_PMTU  116
   #define SCTP_SACK_LOG_NORMAL       117
   #define SCTP_SACK_LOG_EXPRESS      118
   #define SCTP_MAP_TSN_ENTERS        119
   #define SCTP_THRESHOLD_CLEAR       120
   #define SCTP_THRESHOLD_INCR        121
   
   #define SCTP_LOG_MAX_TYPES 122
   /*
    * To turn on various logging, you must first enable 'options KTR' and
    * you might want to bump the entires 'options KTR_ENTRIES=80000'.
    * To get something to log you define one of the logging defines.
    * (see LINT).
    *
    * This gets the compile in place, but you still need to turn the
    * logging flag on too in the sysctl (see in sctp.h).
    */
   
   #define SCTP_LOG_EVENT_UNKNOWN 0
   #define SCTP_LOG_EVENT_CWND  1
   #define SCTP_LOG_EVENT_BLOCK 2
   #define SCTP_LOG_EVENT_STRM  3
   #define SCTP_LOG_EVENT_FR    4
   #define SCTP_LOG_EVENT_MAP   5
   #define SCTP_LOG_EVENT_MAXBURST 6
   #define SCTP_LOG_EVENT_RWND  7
   #define SCTP_LOG_EVENT_MBCNT 8
   #define SCTP_LOG_EVENT_SACK  9
   #define SCTP_LOG_LOCK_EVENT 10
   #define SCTP_LOG_EVENT_RTT  11
   #define SCTP_LOG_EVENT_SB   12
   #define SCTP_LOG_EVENT_NAGLE 13
   #define SCTP_LOG_EVENT_WAKE 14
   #define SCTP_LOG_MISC_EVENT 15
   #define SCTP_LOG_EVENT_CLOSE 16
   #define SCTP_LOG_EVENT_MBUF 17
   #define SCTP_LOG_CHUNK_PROC 18
   #define SCTP_LOG_ERROR_RET  19
   
   #define SCTP_LOG_MAX_EVENT 20
   
   #define SCTP_LOCK_UNKNOWN 2
   
   
   /* number of associations by default for zone allocation */
   #define SCTP_MAX_NUM_OF_ASOC    40000
   /* how many addresses per assoc remote and local */
   #define SCTP_SCALE_FOR_ADDR     2
   
   /* default AUTO_ASCONF mode enable(1)/disable(0) value (sysctl) */
   #if defined (__APPLE__) && !defined(SCTP_APPLE_AUTO_ASCONF)
   #define SCTP_DEFAULT_AUTO_ASCONF        0
   #else
   #define SCTP_DEFAULT_AUTO_ASCONF        1
   #endif
   
   /* default MULTIPLE_ASCONF mode enable(1)/disable(0) value (sysctl) */
   #define SCTP_DEFAULT_MULTIPLE_ASCONFS   0
   
   /* default MOBILITY_BASE mode enable(1)/disable(0) value (sysctl) */
   #if defined (__APPLE__) && !defined(SCTP_APPLE_MOBILITY_BASE)
   #define SCTP_DEFAULT_MOBILITY_BASE      0
   #else
   #define SCTP_DEFAULT_MOBILITY_BASE      0
   #endif
   
   /* default MOBILITY_FASTHANDOFF mode enable(1)/disable(0) value (sysctl) */
   #if defined (__APPLE__) && !defined(SCTP_APPLE_MOBILITY_FASTHANDOFF)
   #define SCTP_DEFAULT_MOBILITY_FASTHANDOFF       0
   #else
   #define SCTP_DEFAULT_MOBILITY_FASTHANDOFF       0
   #endif
   
   /*
    * Theshold for rwnd updates, we have to read (sb_hiwat >>
    * SCTP_RWND_HIWAT_SHIFT) before we will look to see if we need to send a
    * window update sack. When we look, we compare the last rwnd we sent vs the
    * current rwnd. It too must be greater than this value. Using 3 divdes the
    * hiwat by 8, so for 200k rwnd we need to read 24k. For a 64k rwnd we need
    * to read 8k. This seems about right.. I hope :-D.. we do set a
    * min of a MTU on it so if the rwnd is real small we will insist
    * on a full MTU of 1500 bytes.
    */
   #define SCTP_RWND_HIWAT_SHIFT 3
   
   /* How much of the rwnd must the
    * message be taking up to start partial delivery.
    * We calculate this by shifing the hi_water (recv_win)
    * left the following .. set to 1, when a message holds
    * 1/2 the rwnd. If we set it to 2 when a message holds
    * 1/4 the rwnd...etc..
    */
   
   #define SCTP_PARTIAL_DELIVERY_SHIFT 1
   
   /* Minimum number of bytes read by user before we
    * condsider doing a rwnd update
    */
   #define SCTP_MIN_READ_BEFORE_CONSIDERING  3000
   
   /*
    * default HMAC for cookies, etc... use one of the AUTH HMAC id's
    * SCTP_HMAC is the HMAC_ID to use
    * SCTP_SIGNATURE_SIZE is the digest length
    */
   #define SCTP_HMAC               SCTP_AUTH_HMAC_ID_SHA1
   #define SCTP_SIGNATURE_SIZE     SCTP_AUTH_DIGEST_LEN_SHA1
   #define SCTP_SIGNATURE_ALOC_SIZE SCTP_SIGNATURE_SIZE
   
   /* DEFINE HERE WHAT CRC YOU WANT TO USE */
   #define SCTP_USECRC_RFC2960  1
   /* #define SCTP_USECRC_FLETCHER 1 */
   /* #define SCTP_USECRC_SSHCRC32 1 */
   /* #define SCTP_USECRC_FASTCRC32 1 */
   /* #define SCTP_USECRC_CRC32 1 */
   /* #define SCTP_USECRC_TCP32 1 */
   /* #define SCTP_USECRC_CRC16SMAL 1 */
   /* #define SCTP_USECRC_CRC16 1 */
   /* #define SCTP_USECRC_MODADLER 1 */
   
   #ifndef SCTP_ADLER32_BASE
   #define SCTP_ADLER32_BASE 65521
   #endif
   
   /*
    * the SCTP protocol signature this includes the version number encoded in
    * the last 4 bits of the signature.
    */
   #define PROTO_SIGNATURE_A       0x30000000
   #define SCTP_VERSION_NUMBER     0x3
   
   #define MAX_TSN 0xffffffff
   #define MAX_SEQ 0xffff
   
   /* how many executions every N tick's */
   #define SCTP_ITERATOR_MAX_AT_ONCE 20
   
   /* number of clock ticks between iterator executions */
   #define SCTP_ITERATOR_TICKS 1
   
   /*
    * option: If you comment out the following you will receive the old behavior
    * of obeying cwnd for the fast retransmit algorithm. With this defined a FR
    * happens right away with-out waiting for the flightsize to drop below the
    * cwnd value (which is reduced by the FR to 1/2 the inflight packets).
    */
   #define SCTP_IGNORE_CWND_ON_FR 1
   
   /*
    * Adds implementors guide behavior to only use newest highest update in SACK
    * gap ack's to figure out if you need to stroke a chunk for FR.
    */
   #define SCTP_NO_FR_UNLESS_SEGMENT_SMALLER 1
   
   /* default max I can burst out after a fast retransmit */
   #define SCTP_DEF_MAX_BURST 4
   /* IP hdr (20/40) + 12+2+2 (enet) + sctp common 12 */
   #define SCTP_FIRST_MBUF_RESV 68
   /* Packet transmit states in the sent field */
   #define SCTP_DATAGRAM_UNSENT            0
   #define SCTP_DATAGRAM_SENT              1
   #define SCTP_DATAGRAM_RESEND1           2       /* not used (in code, but may
                                                    * hit this value) */
   #define SCTP_DATAGRAM_RESEND2           3       /* not used (in code, but may
                                                    * hit this value) */
   #define SCTP_DATAGRAM_RESEND            4
   #define SCTP_DATAGRAM_ACKED             10010
   #define SCTP_DATAGRAM_MARKED            20010
   #define SCTP_FORWARD_TSN_SKIP           30010
   
   /* chunk output send from locations */
   #define SCTP_OUTPUT_FROM_USR_SEND       0
   #define SCTP_OUTPUT_FROM_T3             1
   #define SCTP_OUTPUT_FROM_INPUT_ERROR    2
   #define SCTP_OUTPUT_FROM_CONTROL_PROC   3
   #define SCTP_OUTPUT_FROM_SACK_TMR       4
   #define SCTP_OUTPUT_FROM_SHUT_TMR       5
   #define SCTP_OUTPUT_FROM_HB_TMR         6
   #define SCTP_OUTPUT_FROM_SHUT_ACK_TMR   7
   #define SCTP_OUTPUT_FROM_ASCONF_TMR     8
   #define SCTP_OUTPUT_FROM_STRRST_TMR     9
   #define SCTP_OUTPUT_FROM_AUTOCLOSE_TMR  10
   #define SCTP_OUTPUT_FROM_EARLY_FR_TMR   11
   #define SCTP_OUTPUT_FROM_STRRST_REQ     12
   #define SCTP_OUTPUT_FROM_USR_RCVD       13
   #define SCTP_OUTPUT_FROM_COOKIE_ACK     14
   #define SCTP_OUTPUT_FROM_DRAIN          15
   #define SCTP_OUTPUT_FROM_CLOSING        16
   /* SCTP chunk types are moved sctp.h for application (NAT, FW) use */
   
   /* align to 32-bit sizes */
   #define SCTP_SIZE32(x)  ((((x)+3) >> 2) << 2)
   
   #define IS_SCTP_CONTROL(a) ((a)->chunk_type != SCTP_DATA)
   #define IS_SCTP_DATA(a) ((a)->chunk_type == SCTP_DATA)
   
   
   /* SCTP parameter types */
   /*************0x0000 series*************/
   #define SCTP_HEARTBEAT_INFO             0x0001
   #define SCTP_IPV4_ADDRESS               0x0005
   #define SCTP_IPV6_ADDRESS               0x0006
   #define SCTP_STATE_COOKIE               0x0007
   #define SCTP_UNRECOG_PARAM              0x0008
   #define SCTP_COOKIE_PRESERVE            0x0009
   #define SCTP_HOSTNAME_ADDRESS           0x000b
   #define SCTP_SUPPORTED_ADDRTYPE         0x000c
   
   /* draft-ietf-stewart-strreset-xxx */
   #define SCTP_STR_RESET_OUT_REQUEST      0x000d
   #define SCTP_STR_RESET_IN_REQUEST       0x000e
   #define SCTP_STR_RESET_TSN_REQUEST      0x000f
   #define SCTP_STR_RESET_RESPONSE         0x0010
   
   #define SCTP_MAX_RESET_PARAMS 2
   #define SCTP_STREAM_RESET_TSN_DELTA    0x1000
   
   /*************0x4000 series*************/
   
   /*************0x8000 series*************/
   #define SCTP_ECN_CAPABLE                0x8000
   /* ECN Nonce: draft-ladha-sctp-ecn-nonce */
   #define SCTP_ECN_NONCE_SUPPORTED        0x8001
   /* draft-ietf-tsvwg-auth-xxx */
   #define SCTP_RANDOM                     0x8002
   #define SCTP_CHUNK_LIST                 0x8003
   #define SCTP_HMAC_LIST                  0x8004
   /*
    * draft-ietf-tsvwg-addip-sctp-xx param=0x8008  len=0xNNNN Byte | Byte | Byte
    * | Byte Byte | Byte ...
    *
    * Where each byte is a chunk type extension supported. For example, to support
    * all chunks one would have (in hex):
    *
    * 80 01 00 09 C0 C1 80 81 82 00 00 00
    *
    * Has the parameter. C0 = PR-SCTP    (RFC3758) C1, 80 = ASCONF (addip draft) 81
    * = Packet Drop 82 = Stream Reset 83 = Authentication
    */
   #define SCTP_SUPPORTED_CHUNK_EXT    0x8008
   
   /*************0xC000 series*************/
   #define SCTP_PRSCTP_SUPPORTED           0xc000
   /* draft-ietf-tsvwg-addip-sctp */
   #define SCTP_ADD_IP_ADDRESS             0xc001
   #define SCTP_DEL_IP_ADDRESS             0xc002
   #define SCTP_ERROR_CAUSE_IND            0xc003
   #define SCTP_SET_PRIM_ADDR              0xc004
   #define SCTP_SUCCESS_REPORT             0xc005
   #define SCTP_ULP_ADAPTATION             0xc006
   
   /* Notification error codes */
   #define SCTP_NOTIFY_DATAGRAM_UNSENT     0x0001
   #define SCTP_NOTIFY_DATAGRAM_SENT       0x0002
   #define SCTP_FAILED_THRESHOLD           0x0004
   #define SCTP_HEARTBEAT_SUCCESS          0x0008
   #define SCTP_RESPONSE_TO_USER_REQ       0x0010
   #define SCTP_INTERNAL_ERROR             0x0020
   #define SCTP_SHUTDOWN_GUARD_EXPIRES     0x0040
   #define SCTP_RECEIVED_SACK              0x0080
   #define SCTP_PEER_FAULTY                0x0100
   #define SCTP_ICMP_REFUSED               0x0200
   
   /* bits for TOS field */
   #define SCTP_ECT0_BIT           0x02
   #define SCTP_ECT1_BIT           0x01
   #define SCTP_CE_BITS            0x03
   
   /* below turns off above */
   #define SCTP_FLEXIBLE_ADDRESS   0x20
   #define SCTP_NO_HEARTBEAT       0x40
   
   /* mask to get sticky */
   #define SCTP_STICKY_OPTIONS_MASK        0x0c
   
   
   /*
    * SCTP states for internal state machine XXX (should match "user" values)
    */
   #define SCTP_STATE_EMPTY                0x0000
   #define SCTP_STATE_INUSE                0x0001
   #define SCTP_STATE_COOKIE_WAIT          0x0002
   #define SCTP_STATE_COOKIE_ECHOED        0x0004
   #define SCTP_STATE_OPEN                 0x0008
   #define SCTP_STATE_SHUTDOWN_SENT        0x0010
   #define SCTP_STATE_SHUTDOWN_RECEIVED    0x0020
   #define SCTP_STATE_SHUTDOWN_ACK_SENT    0x0040
   #define SCTP_STATE_SHUTDOWN_PENDING     0x0080
   #define SCTP_STATE_CLOSED_SOCKET        0x0100
   #define SCTP_STATE_ABOUT_TO_BE_FREED    0x0200
   #define SCTP_STATE_PARTIAL_MSG_LEFT     0x0400
   #define SCTP_STATE_WAS_ABORTED          0x0800
   #define SCTP_STATE_MASK                 0x007f
   
   #define SCTP_GET_STATE(asoc)    ((asoc)->state & SCTP_STATE_MASK)
   #define SCTP_SET_STATE(asoc, newstate)  ((asoc)->state = ((asoc)->state & ~SCTP_STATE_MASK) |  newstate)
   #define SCTP_CLEAR_SUBSTATE(asoc, substate) ((asoc)->state &= ~substate)
   #define SCTP_ADD_SUBSTATE(asoc, substate) ((asoc)->state |= substate)
   
   /* SCTP reachability state for each address */
   #define SCTP_ADDR_REACHABLE             0x001
   #define SCTP_ADDR_NOT_REACHABLE         0x002
   #define SCTP_ADDR_NOHB                  0x004
   #define SCTP_ADDR_BEING_DELETED         0x008
   #define SCTP_ADDR_NOT_IN_ASSOC          0x010
   #define SCTP_ADDR_WAS_PRIMARY           0x020
   #define SCTP_ADDR_SWITCH_PRIMARY        0x040
   #define SCTP_ADDR_OUT_OF_SCOPE          0x080
   #define SCTP_ADDR_DOUBLE_SWITCH         0x100
   #define SCTP_ADDR_UNCONFIRMED           0x200
   #define SCTP_ADDR_REQ_PRIMARY           0x400
   /* JRS 5/13/07 - Added potentially failed state for CMT PF */
   #define SCTP_ADDR_PF            0x800
   #define SCTP_REACHABLE_MASK             0x203
   
   /* bound address types (e.g. valid address types to allow) */
   #define SCTP_BOUND_V6           0x01
   #define SCTP_BOUND_V4           0x02
   
   /*
    * what is the default number of mbufs in a chain I allow before switching to
    * a cluster
    */
   #define SCTP_DEFAULT_MBUFS_IN_CHAIN 5
   
   /* How long a cookie lives in milli-seconds */
   #define SCTP_DEFAULT_COOKIE_LIFE        60000
   
   /* resource limit of streams */
   #define MAX_SCTP_STREAMS        2048
   
   /* Maximum the mapping array will  grow to (TSN mapping array) */
   #define SCTP_MAPPING_ARRAY      512
   
   /* size of the inital malloc on the mapping array */
   #define SCTP_INITIAL_MAPPING_ARRAY  16
   /* how much we grow the mapping array each call */
   #define SCTP_MAPPING_ARRAY_INCR     32
   
   /*
    * Here we define the timer types used by the implementation as arguments in
    * the set/get timer type calls.
    */
   #define SCTP_TIMER_INIT         0
   #define SCTP_TIMER_RECV         1
   #define SCTP_TIMER_SEND         2
   #define SCTP_TIMER_HEARTBEAT    3
   #define SCTP_TIMER_PMTU         4
   #define SCTP_TIMER_MAXSHUTDOWN  5
   #define SCTP_TIMER_SIGNATURE    6
   /*
    * number of timer types in the base SCTP structure used in the set/get and
    * has the base default.
    */
   #define SCTP_NUM_TMRS   7
   
   /* timer types */
   #define SCTP_TIMER_TYPE_NONE            0
   #define SCTP_TIMER_TYPE_SEND            1
   #define SCTP_TIMER_TYPE_INIT            2
   #define SCTP_TIMER_TYPE_RECV            3
   #define SCTP_TIMER_TYPE_SHUTDOWN        4
   #define SCTP_TIMER_TYPE_HEARTBEAT       5
   #define SCTP_TIMER_TYPE_COOKIE          6
   #define SCTP_TIMER_TYPE_NEWCOOKIE       7
   #define SCTP_TIMER_TYPE_PATHMTURAISE    8
   #define SCTP_TIMER_TYPE_SHUTDOWNACK     9
   #define SCTP_TIMER_TYPE_ASCONF          10
   #define SCTP_TIMER_TYPE_SHUTDOWNGUARD   11
   #define SCTP_TIMER_TYPE_AUTOCLOSE       12
   #define SCTP_TIMER_TYPE_EVENTWAKE       13
   #define SCTP_TIMER_TYPE_STRRESET        14
   #define SCTP_TIMER_TYPE_INPKILL         15
   #define SCTP_TIMER_TYPE_ITERATOR        16
   #define SCTP_TIMER_TYPE_EARLYFR         17
   #define SCTP_TIMER_TYPE_ASOCKILL        18
   #define SCTP_TIMER_TYPE_ADDR_WQ         19
   #define SCTP_TIMER_TYPE_ZERO_COPY       20
   #define SCTP_TIMER_TYPE_ZCOPY_SENDQ     21
   #define SCTP_TIMER_TYPE_PRIM_DELETED    22
   /* add new timers here - and increment LAST */
   #define SCTP_TIMER_TYPE_LAST            23
   
   #define SCTP_IS_TIMER_TYPE_VALID(t)     (((t) > SCTP_TIMER_TYPE_NONE) && \
                                            ((t) < SCTP_TIMER_TYPE_LAST))
   
   
   
   /*
    * Number of ticks before the soxwakeup() event that is delayed is sent AFTER
    * the accept() call
    */
   #define SCTP_EVENTWAKEUP_WAIT_TICKS     3000
   
   /*
    * Of course we really don't collect stale cookies, being folks of decerning
    * taste. However we do count them, if we get too many before the association
    * comes up.. we give up. Below is the constant that dictates when we give it
    * up...this is a implemenation dependent treatment. In ours we do not ask
    * for a extension of time, but just retry this many times...
    */
   #define SCTP_MAX_STALE_COOKIES_I_COLLECT 10
   
   /* max number of TSN's dup'd that I will hold */
   #define SCTP_MAX_DUP_TSNS       20
   
   /*
    * Here we define the types used when setting the retry amounts.
    */
   /* constants for type of set */
   #define SCTP_MAXATTEMPT_INIT    2
   #define SCTP_MAXATTEMPT_SEND    3
   
   /* Maximum TSN's we will summarize in a drop report */
   #define SCTP_MAX_DROP_REPORT 16
   
   /* How many drop re-attempts we make on  INIT/COOKIE-ECHO */
   #define SCTP_RETRY_DROPPED_THRESH 4
   
   /*
    * And the max we will keep a history of in the tcb which MUST be lower than
    * 256.
    */
   #define SCTP_MAX_DROP_SAVE_REPORT 16
   
   /*
    * Here we define the default timers and the default number of attemts we
    * make for each respective side (send/init).
    */
   
   /*
    * Maxmium number of chunks a single association can have on it. Note that
    * this is a squishy number since the count can run over this if the user
    * sends a large message down .. the fragmented chunks don't count until
    * AFTER the message is on queue.. it would be the next send that blocks
    * things. This number will get tuned up at boot in the sctp_init and use the
    * number of clusters as a base. This way high bandwidth environments will
    * not get impacted by the lower bandwidth sending a bunch of 1 byte chunks
    */
   #define SCTP_ASOC_MAX_CHUNKS_ON_QUEUE 512
   
   
   /* The conversion from time to ticks and vice versa is done by rounding
    * upwards. This way we can test in the code the time to be positive and
    * know that this corresponds to a positive number of ticks.
    */
   #define MSEC_TO_TICKS(x) ((hz == 1000) ? x : ((((x) * hz) + 999) / 1000))
   #define TICKS_TO_MSEC(x) ((hz == 1000) ? x : ((((x) * 1000) + (hz - 1)) / hz))
   
   #define SEC_TO_TICKS(x) ((x) * hz)
   #define TICKS_TO_SEC(x) (((x) + (hz - 1)) / hz)
   
   /*
    * Basically the minimum amount of time before I do a early FR. Making this
    * value to low will cause duplicate retransmissions.
    */
   #define SCTP_MINFR_MSEC_TIMER 250
   /* The floor this value is allowed to fall to when starting a timer. */
   #define SCTP_MINFR_MSEC_FLOOR 20
   
   /* init timer def = 1 sec */
   #define SCTP_INIT_SEC   1
   
   /* send timer def = 1 seconds */
   #define SCTP_SEND_SEC   1
   
   /* recv timer def = 200ms  */
   #define SCTP_RECV_MSEC  200
   
   /* 30 seconds + RTO (in ms) */
   #define SCTP_HB_DEFAULT_MSEC    30000
   
   /* Max time I will wait for Shutdown to complete */
   #define SCTP_DEF_MAX_SHUTDOWN_SEC 180
   
   
   /*
    * This is how long a secret lives, NOT how long a cookie lives how many
    * ticks the current secret will live.
    */
   #define SCTP_DEFAULT_SECRET_LIFE_SEC 3600
   
   #define SCTP_RTO_UPPER_BOUND    (60000) /* 60 sec in ms */
   #define SCTP_RTO_UPPER_BOUND_SEC 60     /* for the init timer */
   #define SCTP_RTO_LOWER_BOUND    (1000)  /* 1 sec in ms */
   #define SCTP_RTO_INITIAL        (3000)  /* 3 sec in ms */
   
   
   #define SCTP_INP_KILL_TIMEOUT 20/* number of ms to retry kill of inpcb */
   #define SCTP_ASOC_KILL_TIMEOUT 10       /* number of ms to retry kill of inpcb */
   
   #define SCTP_DEF_MAX_INIT       8
   #define SCTP_DEF_MAX_SEND       10
   #define SCTP_DEF_MAX_PATH_RTX   5
   
   #define SCTP_DEF_PMTU_RAISE_SEC 600     /* 10 min between raise attempts */
   #define SCTP_DEF_PMTU_MIN       600
   
   
   #define SCTP_MSEC_IN_A_SEC      1000
   #define SCTP_USEC_IN_A_SEC      1000000
   #define SCTP_NSEC_IN_A_SEC      1000000000
   
   #define SCTP_MAX_OUTSTANDING_DG 10000
   
   /* How many streams I request initally by default */
   #define SCTP_OSTREAM_INITIAL 10
   
   /*
    * How many smallest_mtu's need to increase before a window update sack is
    * sent (should be a power of 2).
    */
   #define SCTP_SEG_TO_RWND_UPD 32
   /* Send window update (incr * this > hiwat). Should be a power of 2 */
   #define SCTP_SCALE_OF_RWND_TO_UPD       4
   #define SCTP_MINIMAL_RWND               (4096)  /* minimal rwnd */
   
   #define SCTP_ADDRMAX            24
   
   /* SCTP DEBUG Switch parameters */
   #define SCTP_DEBUG_TIMER1       0x00000001
   #define SCTP_DEBUG_TIMER2       0x00000002      /* unused */
   #define SCTP_DEBUG_TIMER3       0x00000004      /* unused */
   #define SCTP_DEBUG_TIMER4       0x00000008
   #define SCTP_DEBUG_OUTPUT1      0x00000010
   #define SCTP_DEBUG_OUTPUT2      0x00000020
   #define SCTP_DEBUG_OUTPUT3      0x00000040
   #define SCTP_DEBUG_OUTPUT4      0x00000080
   #define SCTP_DEBUG_UTIL1        0x00000100
   #define SCTP_DEBUG_UTIL2        0x00000200      /* unused */
   #define SCTP_DEBUG_AUTH1        0x00000400
   #define SCTP_DEBUG_AUTH2        0x00000800      /* unused */
   #define SCTP_DEBUG_INPUT1       0x00001000
   #define SCTP_DEBUG_INPUT2       0x00002000
   #define SCTP_DEBUG_INPUT3       0x00004000
   #define SCTP_DEBUG_INPUT4       0x00008000      /* unused */
   #define SCTP_DEBUG_ASCONF1      0x00010000
   #define SCTP_DEBUG_ASCONF2      0x00020000
   #define SCTP_DEBUG_OUTPUT5      0x00040000      /* unused */
   #define SCTP_DEBUG_XXX          0x00080000      /* unused */
   #define SCTP_DEBUG_PCB1         0x00100000
   #define SCTP_DEBUG_PCB2         0x00200000      /* unused */
   #define SCTP_DEBUG_PCB3         0x00400000
   #define SCTP_DEBUG_PCB4         0x00800000
   #define SCTP_DEBUG_INDATA1      0x01000000
   #define SCTP_DEBUG_INDATA2      0x02000000      /* unused */
   #define SCTP_DEBUG_INDATA3      0x04000000      /* unused */
   #define SCTP_DEBUG_INDATA4      0x08000000      /* unused */
   #define SCTP_DEBUG_USRREQ1      0x10000000      /* unused */
   #define SCTP_DEBUG_USRREQ2      0x20000000      /* unused */
   #define SCTP_DEBUG_PEEL1        0x40000000
   #define SCTP_DEBUG_XXXXX        0x80000000      /* unused */
   #define SCTP_DEBUG_ALL          0x7ff3ffff
   #define SCTP_DEBUG_NOISY        0x00040000
   
   /* What sender needs to see to avoid SWS or we consider peers rwnd 0 */
   #define SCTP_SWS_SENDER_DEF     1420
   
   /*
    * SWS is scaled to the sb_hiwat of the socket. A value of 2 is hiwat/4, 1
    * would be hiwat/2 etc.
    */
   /* What receiver needs to see in sockbuf or we tell peer its 1 */
   #define SCTP_SWS_RECEIVER_DEF   3000
   
   #define SCTP_INITIAL_CWND 4380
   
   #define SCTP_DEFAULT_MTU 1500   /* emegency default MTU */
   /* amount peer is obligated to have in rwnd or I will abort */
   #define SCTP_MIN_RWND   1500
   
   #define SCTP_WINDOW_MIN 1500    /* smallest rwnd can be */
   #define SCTP_WINDOW_MAX 1048576 /* biggest I can grow rwnd to My playing
                                    * around suggests a value greater than 64k
                                    * does not do much, I guess via the kernel
                                    * limitations on the stream/socket. */
   
   /* I can handle a 1meg re-assembly */
   #define SCTP_DEFAULT_MAXMSGREASM 1048576
   
   #define SCTP_DEFAULT_MAXSEGMENT 65535
   
   #define SCTP_CHUNK_BUFFER_SIZE  512
   #define SCTP_PARAM_BUFFER_SIZE  512
   
   /* small chunk store for looking at chunk_list in auth */
   #define SCTP_SMALL_CHUNK_STORE 260
   
   #define SCTP_DEFAULT_MINSEGMENT 512     /* MTU size ... if no mtu disc */
   #define SCTP_HOW_MANY_SECRETS   2       /* how many secrets I keep */
   
   #define SCTP_NUMBER_OF_SECRETS  8       /* or 8 * 4 = 32 octets */
   #define SCTP_SECRET_SIZE        32      /* number of octets in a 256 bits */
   
   
   /*
    * SCTP upper layer notifications
    */
   #define SCTP_NOTIFY_ASSOC_UP            1
   #define SCTP_NOTIFY_ASSOC_DOWN          2
   #define SCTP_NOTIFY_INTERFACE_DOWN      3
   #define SCTP_NOTIFY_INTERFACE_UP        4
   #define SCTP_NOTIFY_DG_FAIL             5
   #define SCTP_NOTIFY_STRDATA_ERR         6
   #define SCTP_NOTIFY_ASSOC_ABORTED       7
   #define SCTP_NOTIFY_PEER_OPENED_STREAM  8
   #define SCTP_NOTIFY_STREAM_OPENED_OK    9
   #define SCTP_NOTIFY_ASSOC_RESTART       10
   #define SCTP_NOTIFY_HB_RESP             11
   #define SCTP_NOTIFY_ASCONF_SUCCESS      12
   #define SCTP_NOTIFY_ASCONF_FAILED       13
   #define SCTP_NOTIFY_PEER_SHUTDOWN       14
   #define SCTP_NOTIFY_ASCONF_ADD_IP       15
   #define SCTP_NOTIFY_ASCONF_DELETE_IP    16
   #define SCTP_NOTIFY_ASCONF_SET_PRIMARY  17
   #define SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION 18
   #define SCTP_NOTIFY_INTERFACE_CONFIRMED 20
   #define SCTP_NOTIFY_STR_RESET_RECV      21
   #define SCTP_NOTIFY_STR_RESET_SEND      22
   #define SCTP_NOTIFY_STR_RESET_FAILED_OUT 23
   #define SCTP_NOTIFY_STR_RESET_FAILED_IN 24
   #define SCTP_NOTIFY_AUTH_NEW_KEY        25
   #define SCTP_NOTIFY_AUTH_KEY_CONFLICT   26
   #define SCTP_NOTIFY_SPECIAL_SP_FAIL     27
   #define SCTP_NOTIFY_MAX                 27
   
   /* This is the value for messages that are NOT completely
    * copied down where we will start to split the message.
    * So, with our default, we split only if the piece we
    * want to take will fill up a full MTU (assuming
    * a 1500 byte MTU).
    */
   #define SCTP_DEFAULT_SPLIT_POINT_MIN 2904
   
   /* ABORT CODES and other tell-tale location
    * codes are generated by adding the below
    * to the instance id.
    */
   
   /* File defines */
   #define SCTP_FROM_SCTP_INPUT   0x10000000
   #define SCTP_FROM_SCTP_PCB     0x20000000
   #define SCTP_FROM_SCTP_INDATA  0x30000000
   #define SCTP_FROM_SCTP_TIMER   0x40000000
   #define SCTP_FROM_SCTP_USRREQ  0x50000000
   #define SCTP_FROM_SCTPUTIL     0x60000000
   #define SCTP_FROM_SCTP6_USRREQ 0x70000000
   #define SCTP_FROM_SCTP_ASCONF  0x80000000
   #define SCTP_FROM_SCTP_OUTPUT  0x90000000
   #define SCTP_FROM_SCTP_PEELOFF 0xa0000000
   #define SCTP_FROM_SCTP_PANDA   0xb0000000
   #define SCTP_FROM_SCTP_SYSCTL  0xc0000000
   
   /* Location ID's */
   #define SCTP_LOC_1  0x00000001
   #define SCTP_LOC_2  0x00000002
   #define SCTP_LOC_3  0x00000003
   #define SCTP_LOC_4  0x00000004
   #define SCTP_LOC_5  0x00000005
   #define SCTP_LOC_6  0x00000006
   #define SCTP_LOC_7  0x00000007
   #define SCTP_LOC_8  0x00000008
   #define SCTP_LOC_9  0x00000009
   #define SCTP_LOC_10 0x0000000a
   #define SCTP_LOC_11 0x0000000b
   #define SCTP_LOC_12 0x0000000c
   #define SCTP_LOC_13 0x0000000d
   #define SCTP_LOC_14 0x0000000e
   #define SCTP_LOC_15 0x0000000f
   #define SCTP_LOC_16 0x00000010
   #define SCTP_LOC_17 0x00000011
   #define SCTP_LOC_18 0x00000012
   #define SCTP_LOC_19 0x00000013
   #define SCTP_LOC_20 0x00000014
   #define SCTP_LOC_21 0x00000015
   #define SCTP_LOC_22 0x00000016
   #define SCTP_LOC_23 0x00000017
   #define SCTP_LOC_24 0x00000018
   #define SCTP_LOC_25 0x00000019
   #define SCTP_LOC_26 0x0000001a
   #define SCTP_LOC_27 0x0000001b
   #define SCTP_LOC_28 0x0000001c
   #define SCTP_LOC_29 0x0000001d
   #define SCTP_LOC_30 0x0000001e
   #define SCTP_LOC_31 0x0000001f
   #define SCTP_LOC_32 0x00000020
   #define SCTP_LOC_33 0x00000021
   
   
   /* Free assoc codes */
   #define SCTP_NORMAL_PROC      0
   #define SCTP_PCBFREE_NOFORCE  1
   #define SCTP_PCBFREE_FORCE    2
   
   /* From codes for adding addresses */
   #define SCTP_ADDR_IS_CONFIRMED 8
   #define SCTP_ADDR_DYNAMIC_ADDED 6
   #define SCTP_IN_COOKIE_PROC 100
   #define SCTP_ALLOC_ASOC  1
   #define SCTP_LOAD_ADDR_2 2
   #define SCTP_LOAD_ADDR_3 3
   #define SCTP_LOAD_ADDR_4 4
   #define SCTP_LOAD_ADDR_5 5
   
   #define SCTP_DONOT_SETSCOPE 0
   #define SCTP_DO_SETSCOPE 1
   
   
   /* This value determines the default for when
    * we try to add more on the send queue., if
    * there is room. This prevents us from cycling
    * into the copy_resume routine to often if
    * we have not got enough space to add a decent
    * enough size message. Note that if we have enough
    * space to complete the message copy we will always
    * add to the message, no matter what the size. Its
    * only when we reach the point that we have some left
    * to add, there is only room for part of it that we
    * will use this threshold. Its also a sysctl.
    */
   #define SCTP_DEFAULT_ADD_MORE 1452
   
   #ifndef SCTP_PCBHASHSIZE
   /* default number of association hash buckets in each endpoint */
   #define SCTP_PCBHASHSIZE 256
   #endif
   #ifndef SCTP_TCBHASHSIZE
   #define SCTP_TCBHASHSIZE 1024
   #endif
   
   #ifndef SCTP_CHUNKQUEUE_SCALE
   #define SCTP_CHUNKQUEUE_SCALE 10
   #endif
   
   /* clock variance is 1 ms */
   #define SCTP_CLOCK_GRANULARITY  1
   #define IP_HDR_SIZE 40          /* we use the size of a IP6 header here this
                                    * detracts a small amount for ipv4 but it
                                    * simplifies the ipv6 addition */
   
   /* Argument magic number for sctp_inpcb_free() */
   
   /* third argument */
   #define SCTP_CALLED_DIRECTLY_NOCMPSET     0
   #define SCTP_CALLED_AFTER_CMPSET_OFCLOSE  1
   
   /* second argument */
   #define SCTP_FREE_SHOULD_USE_ABORT          1
   #define SCTP_FREE_SHOULD_USE_GRACEFUL_CLOSE 0
   
   #ifndef IPPROTO_SCTP
   #define IPPROTO_SCTP 132        /* the Official IANA number :-) */
   #endif                          /* !IPPROTO_SCTP */
   
   #define SCTP_MAX_DATA_BUNDLING          256
   #define SCTP_MAX_CONTROL_BUNDLING       20
   
   /* modular comparison */
   /* True if a > b (mod = M) */
   #define compare_with_wrap(a, b, M) (((a > b) && ((a - b) < ((M >> 1) + 1))) || \
                 ((b > a) && ((b - a) > ((M >> 1) + 1))))
   
   
   /* Mapping array manipulation routines */
   #define SCTP_IS_TSN_PRESENT(arry, gap) ((arry[(gap >> 3)] >> (gap & 0x07)) & 0x01)
   #define SCTP_SET_TSN_PRESENT(arry, gap) (arry[(gap >> 3)] |= (0x01 << ((gap & 0x07))))
   #define SCTP_UNSET_TSN_PRESENT(arry, gap) (arry[(gap >> 3)] &= ((~(0x01 << ((gap & 0x07)))) & 0xff))
   
   
   #define SCTP_RETRAN_DONE -1
   #define SCTP_RETRAN_EXIT -2
   
   /*
    * This value defines the number of vtag block time wait entry's per list
    * element.  Each entry will take 2 4 byte ints (and of course the overhead
    * of the next pointer as well). Using 15 as an example will yield * ((8 *
    * 15) + 8) or 128 bytes of overhead for each timewait block that gets
    * initialized. Increasing it to 31 would yeild 256 bytes per block.
    */
   #define SCTP_NUMBER_IN_VTAG_BLOCK 15
   /*
    * If we use the STACK option, we have an array of this size head pointers.
   * This array is mod'd the with the size to find which bucket and then all
   * entries must be searched to see if the tag is in timed wait. If so we
   * reject it.
   */
  #define SCTP_STACK_VTAG_HASH_SIZE   31
  #define SCTP_STACK_VTAG_HASH_SIZE_A 32
  
  
  /*
   * If we use the per-endpoint model than we do not have a hash table of
   * entries but instead have a single head pointer and we must crawl through
   * the entire list.
   */
  
  /*
   * Number of seconds of time wait for a vtag.
   */
  #define SCTP_TIME_WAIT 60
  
  /* This time wait is the same as the default cookie life
   * since we now enter a tag in every time we send a cookie.
   * We want this shorter to avoid vtag depletion.
   */
  #define SCTP_TIME_WAIT_SHORT 60
  
  /* The system retains a cache of free chunks such to
   * cut down on calls the memory allocation system. There
   * is a per association limit of free items and a overall
   * system limit. If either one gets hit then the resource
   * stops being cached.
   */
  
  #define SCTP_DEF_ASOC_RESC_LIMIT 10
  #define SCTP_DEF_SYSTEM_RESC_LIMIT 1000
  
  /*-
   * defines for socket lock states.
   * Used by __APPLE__ and SCTP_SO_LOCK_TESTING
   */
  #define SCTP_SO_LOCKED          1
  #define SCTP_SO_NOT_LOCKED      0
  
  
  #define SCTP_HOLDS_LOCK 1
  #define SCTP_NOT_LOCKED 0
  
  /*-
   * For address locks, do we hold the lock?
   */
  #define SCTP_ADDR_LOCKED 1
  #define SCTP_ADDR_NOT_LOCKED 0
  
  #define IN4_ISPRIVATE_ADDRESS(a) \
     ((((uint8_t *)&(a)->s_addr)[0] == 10) || \
      ((((uint8_t *)&(a)->s_addr)[0] == 172) && \
       (((uint8_t *)&(a)->s_addr)[1] >= 16) && \
       (((uint8_t *)&(a)->s_addr)[1] <= 32)) || \
      ((((uint8_t *)&(a)->s_addr)[0] == 192) && \
       (((uint8_t *)&(a)->s_addr)[1] == 168)))
  
  #define IN4_ISLOOPBACK_ADDRESS(a) \
      ((((uint8_t *)&(a)->s_addr)[0] == 127) && \
       (((uint8_t *)&(a)->s_addr)[1] == 0) && \
       (((uint8_t *)&(a)->s_addr)[2] == 0) && \
       (((uint8_t *)&(a)->s_addr)[3] == 1))
  
  
  #if defined(_KERNEL)
  
  #define SCTP_GETTIME_TIMEVAL(x) (getmicrouptime(x))
  #define SCTP_GETPTIME_TIMEVAL(x)        (microuptime(x))
  #endif
  /*#if defined(__FreeBSD__) || defined(__APPLE__)*/
  /*#define SCTP_GETTIME_TIMEVAL(x) { \*/
  /*      (x)->tv_sec = ticks / 1000; \*/
  /*      (x)->tv_usec = (ticks % 1000) * 1000; \*/
  /*}*/
  
  /*#else*/
  /*#define SCTP_GETTIME_TIMEVAL(x)       (microtime(x))*/
  /*#endif                                 __FreeBSD__ */
  
  #if defined(_KERNEL) || defined(__Userspace__)
  #define sctp_sowwakeup(inp, so) \
  do { \
          if (inp->sctp_flags & SCTP_PCB_FLAGS_DONT_WAKE) { \
                  inp->sctp_flags |= SCTP_PCB_FLAGS_WAKEOUTPUT; \
          } else { \
                  sowwakeup(so); \
          } \
  } while (0)
  
  #define sctp_sowwakeup_locked(inp, so) \
  do { \
          if (inp->sctp_flags & SCTP_PCB_FLAGS_DONT_WAKE) { \
                  SOCKBUF_UNLOCK(&((so)->so_snd)); \
                  inp->sctp_flags |= SCTP_PCB_FLAGS_WAKEOUTPUT; \
          } else { \
                  sowwakeup_locked(so); \
          } \
  } while (0)
  
  #define sctp_sorwakeup(inp, so) \
  do { \
          if (inp->sctp_flags & SCTP_PCB_FLAGS_DONT_WAKE) { \
                  inp->sctp_flags |= SCTP_PCB_FLAGS_WAKEINPUT; \
          } else { \
                  sorwakeup(so); \
          } \
  } while (0)
  
  #define sctp_sorwakeup_locked(inp, so) \
  do { \
          if (inp->sctp_flags & SCTP_PCB_FLAGS_DONT_WAKE) { \
                  inp->sctp_flags |= SCTP_PCB_FLAGS_WAKEINPUT; \
                  SOCKBUF_UNLOCK(&((so)->so_rcv)); \
          } else { \
                  sorwakeup_locked(so); \
          } \
  } while (0)
  
  #endif                          /* _KERNEL || __Userspace__ */
  #endif

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