/*      $KAME: sctp_constants.h,v 1.17 2005/03/06 16:04:17 itojun Exp $ */
/*      $NetBSD: sctp_constants.h,v 1.5 2024/02/02 22:00:34 andvar Exp $ */

#ifndef __SCTP_CONSTANTS_H__
#define __SCTP_CONSTANTS_H__

/*
 * Copyright (c) 2001, 2002, 2003, 2004 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:
 * 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 acknowledgement:
 *      This product includes software developed by Cisco Systems, Inc.
 * 4. Neither the name of the project 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 CISCO SYSTEMS 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 CISCO SYSTEMS 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.
 */
#define SCTP_VERSION_STRING "KAME-BSD 1.1"
/*#define SCTP_AUDITING_ENABLED 1 used for debug/auditing */
#define SCTP_AUDIT_SIZE 256
#define SCTP_STAT_LOG_SIZE 80000

/* 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
/*
 * To turn on various logging, you must first define SCTP_STAT_LOGGING.
 * Then to get something to log you define one of the logging defines i.e.
 *
 * SCTP_CWND_LOGGING
 * SCTP_BLK_LOGGING
 * SCTP_STR_LOGGING
 * SCTP_FR_LOGGING
 *
 * Any one or a combination of the logging can be turned on.
 */
#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


/* 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) */
#define SCTP_DEFAULT_AUTO_ASCONF        0

/*
 * If you wish to use MD5 instead of SLA uncomment the line below.
 * Why you would like to do this:
 * a) There may be IPR on SHA-1, or so the FIP-180-1 page says,
 * b) MD5 is 3 times faster (has coded here).
 *
 * The disadvantage is it is thought that MD5 has been cracked... see RFC2104.
 */
/*#define USE_MD5 1 */
/*
 * Note: I can't seem to get this to compile now for some reason- the
 * kernel can't link in the md5 crypto
 */

/* 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

#define SCTP_CWND_POSTS_LIST 256
/*
 * 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_MAX_ITERATOR_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 8

/* 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_RESEND3           4 /* not used (in code, but may hit this value) */
#define SCTP_DATAGRAM_RESEND            5
#define SCTP_DATAGRAM_ACKED             10010
#define SCTP_DATAGRAM_INBOUND           10011
#define SCTP_READY_TO_TRANSMIT          10012
#define SCTP_DATAGRAM_MARKED            20010
#define SCTP_FORWARD_TSN_SKIP           30010

/* SCTP chunk types */
/* Moved to sctp.h so f/w and natd
 * boxes can find the chunk types.
 */

/* 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 */
#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
#define SCTP_ECN_CAPABLE            0x8000
/* draft-ietf-stewart-strreset-xxx */
#define SCTP_STR_RESET_REQUEST      0x000d
#define SCTP_STR_RESET_RESPONSE     0x000e

/* ECN Nonce: draft-ladha-sctp-ecn-nonce */
#define SCTP_ECN_NONCE_SUPPORTED    0x8001
/*
 * draft-ietf-stewart-strreset-xxx
 *   param=0x8001  len=0xNNNN
 *   Byte | Byte | Byte | Byte
 *   Byte | Byte ...
 *
 *  Where each Byte is a chunk type
 *  extension supported so 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
 */

/* draft-ietf-tsvwg-prsctp */
#define SCTP_SUPPORTED_CHUNK_EXT    0x8008

/* number of extensions we support */
#define SCTP_EXT_COUNT 5        /* num of extensions we support chunk wise */
#define SCTP_PAD_EXT_COUNT 3    /* num of pad bytes needed to get to 32 bit boundary */


#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_ADAPTION           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       0x000f
#define SCTP_INTERNAL_ERROR             0x0010
#define SCTP_SHUTDOWN_GUARD_EXPIRES     0x0020
#define SCTP_RECEIVED_SACK              0x0040
#define SCTP_PEER_FAULTY                0x0080

/* Error causes used in SCTP op-err's and aborts */
#define SCTP_CAUSE_INV_STRM             0x001
#define SCTP_CAUSE_MISS_PARAM           0x002
#define SCTP_CAUSE_STALE_COOKIE         0x003
#define SCTP_CAUSE_OUT_OF_RESC          0x004
#define SCTP_CAUSE_UNRESOLV_ADDR        0x005
#define SCTP_CAUSE_UNRECOG_CHUNK        0x006
#define SCTP_CAUSE_INVALID_PARAM        0x007
/* This one is also the same as SCTP_UNRECOG_PARAM above */
#define SCTP_CAUSE_UNRECOG_PARAM        0x008
#define SCTP_CAUSE_NOUSER_DATA          0x009
#define SCTP_CAUSE_COOKIE_IN_SHUTDOWN   0x00a
#define SCTP_CAUSE_RESTART_W_NEWADDR    0x00b
#define SCTP_CAUSE_USER_INITIATED_ABT   0x00c
#define SCTP_CAUSE_PROTOCOL_VIOLATION   0x00d

/* Error's from add ip */
#define SCTP_CAUSE_DELETEING_LAST_ADDR  0x100
#define SCTP_CAUSE_OPERATION_REFUSED    0x101
#define SCTP_CAUSE_DELETING_SRC_ADDR    0x102
#define SCTP_CAUSE_ILLEGAL_ASCONF       0x103

/* 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

/* MTU discovery flags */
#define SCTP_DONT_FRAGMENT      0x0100
#define SCTP_FRAGMENT_OK        0x0200
#define SCTP_PR_SCTP_ENABLED    0x0400
#define SCTP_PR_SCTP_BUFFER     0x0800

/* Chunk flags */
#define SCTP_WINDOW_PROBE       0x01

/*
 * 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_MASK                 0x007f

#define SCTP_GET_STATE(asoc)    ((asoc)->state & SCTP_STATE_MASK)

/* 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_REACHABLE_MASK             0x203

/* bound address types (e.g. valid address types to allow) */
#define SCTP_BOUND_V6           0x01
#define SCTP_BOUND_V4           0x02

/* How long a cookie lives in seconds */
#define SCTP_DEFAULT_COOKIE_LIFE        60

/* 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 initial 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

/*
 * 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
 * implementation 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

#define SCTP_TIMER_TYPE_ITERATOR        16
/*
 * 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

#define MSEC_TO_TICKS(x) (((x) * hz) / 1000)
#define TICKS_TO_MSEC(x) (((x) * 1000) / hz)
#define SEC_TO_TICKS(x) ((x) * hz)

/* 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 1000 /* number of ms to retry kill of inpcb*/

#define SCTP_DEF_MAX_INIT       8
#define SCTP_DEF_MAX_SEND       10

#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 initially by default */
#define SCTP_OSTREAM_INITIAL 10

#define SCTP_SEG_TO_RWND_UPD 32 /* How many smallest_mtu's need to increase before
                                 * a window update sack is sent (should be a
                                 * power of 2).
                                 */
#define SCTP_SCALE_OF_RWND_TO_UPD       4       /* Incr * this > hiwat, send
                                                 * window update. Should be a
                                                 * power of 2.
                                                 */
#define SCTP_MINIMAL_RWND               (4096) /* minimal rwnd */

#define SCTP_ADDRMAX            20


/* SCTP DEBUG Switch parameters */
#define SCTP_DEBUG_TIMER1       0x00000001
#define SCTP_DEBUG_TIMER2       0x00000002
#define SCTP_DEBUG_TIMER3       0x00000004
#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
#define SCTP_DEBUG_INPUT1       0x00001000
#define SCTP_DEBUG_INPUT2       0x00002000
#define SCTP_DEBUG_INPUT3       0x00004000
#define SCTP_DEBUG_INPUT4       0x00008000
#define SCTP_DEBUG_ASCONF1      0x00010000
#define SCTP_DEBUG_ASCONF2      0x00020000
#define SCTP_DEBUG_OUTPUT5      0x00040000
#define SCTP_DEBUG_PCB1         0x00100000
#define SCTP_DEBUG_PCB2         0x00200000
#define SCTP_DEBUG_PCB3         0x00400000
#define SCTP_DEBUG_PCB4         0x00800000
#define SCTP_DEBUG_INDATA1      0x01000000
#define SCTP_DEBUG_INDATA2      0x02000000
#define SCTP_DEBUG_INDATA3      0x04000000
#define SCTP_DEBUG_INDATA4      0x08000000
#define SCTP_DEBUG_USRREQ1      0x10000000
#define SCTP_DEBUG_USRREQ2      0x20000000
#define SCTP_DEBUG_PEEL1        0x40000000
#define SCTP_DEBUG_ALL          0x7ff3f3ff
#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

/* 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.
                                 */

#define SCTP_MAX_BUNDLE_UP      256     /* max number of chunks to bundle */

/*  I can handle a 1meg re-assembly */
#define SCTP_DEFAULT_MAXMSGREASM 1048576

#define SCTP_DEFAULT_MAXSEGMENT 65535

#define DEFAULT_CHUNK_BUFFER    2048
#define DEFAULT_PARAM_BUFFER    512

#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 */

#ifdef USE_MD5
#define SCTP_SIGNATURE_SIZE     16      /* size of a MD5 signature */
#else
#define SCTP_SIGNATURE_SIZE     20      /* size of a SLA-1 signature */
#endif /* USE_MD5 */

#define SCTP_SIGNATURE_ALOC_SIZE 20

/*
 * 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_ADAPTION_INDICATION         19
#define SCTP_NOTIFY_INTERFACE_CONFIRMED 20
#define SCTP_NOTIFY_STR_RESET_RECV      21
#define SCTP_NOTIFY_STR_RESET_SEND      22
#define SCTP_NOTIFY_MAX                 22





/* clock variance is 10ms */
#define SCTP_CLOCK_GRANULARITY  10

#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
                                 */

#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))

/* pegs */
#define SCTP_NUMBER_OF_PEGS     96
/* peg index's */
#define SCTP_PEG_SACKS_SEEN     0
#define SCTP_PEG_SACKS_SENT     1
#define SCTP_PEG_TSNS_SENT      2
#define SCTP_PEG_TSNS_RCVD      3
#define SCTP_DATAGRAMS_SENT     4
#define SCTP_DATAGRAMS_RCVD     5
#define SCTP_RETRANTSN_SENT     6
#define SCTP_DUPTSN_RECVD       7
#define SCTP_HB_RECV            8
#define SCTP_HB_ACK_RECV        9
#define SCTP_HB_SENT            10
#define SCTP_WINDOW_PROBES      11
#define SCTP_DATA_DG_RECV       12
#define SCTP_TMIT_TIMER         13
#define SCTP_RECV_TIMER         14
#define SCTP_HB_TIMER           15
#define SCTP_FAST_RETRAN        16
#define SCTP_TIMERS_EXP         17
#define SCTP_FR_INAWINDOW       18
#define SCTP_RWND_BLOCKED       19
#define SCTP_CWND_BLOCKED       20
#define SCTP_RWND_DROPS         21
#define SCTP_BAD_STRMNO         22
#define SCTP_BAD_SSN_WRAP       23
#define SCTP_DROP_NOMEMORY      24
#define SCTP_DROP_FRAG          25
#define SCTP_BAD_VTAGS          26
#define SCTP_BAD_CSUM           27
#define SCTP_INPKTS             28
#define SCTP_IN_MCAST           29
#define SCTP_HDR_DROPS          30
#define SCTP_NOPORTS            31
#define SCTP_CWND_NOFILL        32
#define SCTP_CALLS_TO_CO        33
#define SCTP_CO_NODATASNT       34
#define SCTP_CWND_NOUSE_SS      35
#define SCTP_MAX_BURST_APL      36
#define SCTP_EXPRESS_ROUTE      37
#define SCTP_NO_COPY_IN         38
#define SCTP_CACHED_SRC         39
#define SCTP_CWND_NOCUM         40
#define SCTP_CWND_SS            41
#define SCTP_CWND_CA            42
#define SCTP_CWND_SKIP          43
#define SCTP_CWND_NOUSE_CA      44
#define SCTP_MAX_CWND           45
#define SCTP_CWND_DIFF_CA       46
#define SCTP_CWND_DIFF_SA       47
#define SCTP_OQS_AT_SS          48
#define SCTP_SQQ_AT_SS          49
#define SCTP_OQS_AT_CA          50
#define SCTP_SQQ_AT_CA          51
#define SCTP_MOVED_MTU          52
#define SCTP_MOVED_QMAX         53
#define SCTP_SQC_AT_SS          54
#define SCTP_SQC_AT_CA          55
#define SCTP_MOVED_MAX          56
#define SCTP_MOVED_NLEF         57
#define SCTP_NAGLE_NOQ          58
#define SCTP_NAGLE_OFF          59
#define SCTP_OUTPUT_FRM_SND     60
#define SCTP_SOS_NOSNT          61
#define SCTP_NOS_NOSNT          62
#define SCTP_SOSE_NOSNT         63
#define SCTP_NOSE_NOSNT         64
#define SCTP_DATA_OUT_ERR       65
#define SCTP_DUP_SSN_RCVD       66
#define SCTP_DUP_FR             67
#define SCTP_VTAG_EXPR          68
#define SCTP_VTAG_BOGUS         69
#define SCTP_T3_SAFEGRD         70
#define SCTP_PDRP_FMBOX         71
#define SCTP_PDRP_FEHOS         72
#define SCTP_PDRP_MB_DA         73
#define SCTP_PDRP_MB_CT         74
#define SCTP_PDRP_BWRPT         75
#define SCTP_PDRP_CRUPT         76
#define SCTP_PDRP_NEDAT         77
#define SCTP_PDRP_PDBRK         78
#define SCTP_PDRP_TSNNF         79
#define SCTP_PDRP_DNFND         80
#define SCTP_PDRP_DIWNP         81
#define SCTP_PDRP_DIZRW         82
#define SCTP_PDRP_BADD          83
#define SCTP_PDRP_MARK          84
#define SCTP_ECNE_RCVD          85
#define SCTP_CWR_PERFO          86
#define SCTP_ECNE_SENT          87
#define SCTP_MSGC_DROP          88
#define SCTP_SEND_QUEUE_POP     89
#define SCTP_ERROUT_FRM_USR     90
#define SCTP_SENDTO_FULL_CWND   91
#define SCTP_QUEONLY_BURSTLMT   92
#define SCTP_IFP_QUEUE_FULL     93
#define SCTP_RESV2              94
#define SCTP_RESV3              95

/*
 * 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 yield 256 bytes per block.
 */
/* Undef the following turns on per EP behavior */
#define SCTP_VTAG_TIMEWAIT_PER_STACK 1
#ifdef SCTP_VTAG_TIMEWAIT_PER_STACK
#define SCTP_NUMBER_IN_VTAG_BLOCK 15
#else
/* The hash list is smaller if we are on a ep basis */
#define SCTP_NUMBER_IN_VTAG_BLOCK 3
#endif
/*
 * 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

/*
 * 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, tied to MSL value (2 minutes),
 * so 2 * MSL = 4 minutes or 480 seconds.
 */
#define SCTP_TIME_WAIT 480

#define IN4_ISPRIVATE_ADDRESS(a) \
   ((((const u_char *)&(a)->s_addr)[0] == 10) || \
    ((((const u_char *)&(a)->s_addr)[0] == 172) && \
     (((const u_char *)&(a)->s_addr)[1] >= 16) && \
     (((const u_char *)&(a)->s_addr)[1] <= 32)) || \
    ((((const u_char *)&(a)->s_addr)[0] == 192) && \
     (((const u_char *)&(a)->s_addr)[1] == 168)))

#define IN4_ISLOOPBACK_ADDRESS(a) \
    ((((const u_char *)&(a)->s_addr)[0] == 127) && \
     (((const u_char *)&(a)->s_addr)[1] == 0) && \
     (((const u_char *)&(a)->s_addr)[2] == 0) && \
     (((const u_char *)&(a)->s_addr)[3] == 1))


#if defined(_KERNEL) || (defined(__APPLE__) && defined(KERNEL))

#if defined(__FreeBSD__) || defined(__APPLE__)
#define SCTP_GETTIME_TIMEVAL(x) (microuptime(x))
#define SCTP_GETTIME_TIMESPEC(x) (nanouptime(x))
#else
#define SCTP_GETTIME_TIMEVAL(x) (microtime(x))
#define SCTP_GETTIME_TIMESPEC(x) (nanotime(x))
#endif /* __FreeBSD__ */

#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_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)

#endif /* _KERNEL */
#endif