/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
 * Copyright (c) 2008-2012, by Michael Tuexen. 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.
 */

#ifndef _NETINET_SCTP_CONSTANTS_H_
#define _NETINET_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)

/* Largest length of a chunk */
#define SCTP_MAX_CHUNK_LENGTH 0xffff
/* Largest length of an error cause */
#define SCTP_MAX_CAUSE_LENGTH 0xffff
/* 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_KTRHEAD_NAME "sctp_iterator"
#define SCTP_KTHREAD_PAGES 0

#define SCTP_MCORE_NAME "sctp_core_worker"

/* If you support Multi-VRF how big to
 * make the initial array of VRF's to.
 */
#define SCTP_DEFAULT_VRF_SIZE 4

/* 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_FLIGHT_LOG_DWN_WP_FWD 122
#define SCTP_FWD_TSN_CHECK         123
#define SCTP_LOG_MAX_TYPES 124
/*
 * 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 MULTIPLE_ASCONF mode enable(1)/disable(0) value (sysctl) */
#define SCTP_DEFAULT_MULTIPLE_ASCONFS   0

/*
 * Threshold 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

/*
 * 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

/*
 * 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

/* 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, 0 disables it */
#define SCTP_DEF_MAX_BURST 4
#define SCTP_DEF_HBMAX_BURST 4
#define SCTP_DEF_FRMAX_BURST 4

/* RTO calculation flag to say if it
 * is safe to determine local lan or not.
 */
#define SCTP_RTT_FROM_NON_DATA 0
#define SCTP_RTT_FROM_DATA     1

#define PR_SCTP_UNORDERED_FLAG 0x0001

/* 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
#define SCTP_DATAGRAM_NR_ACKED          40010

/* 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
#define SCTP_OUTPUT_FROM_SOCKOPT        17

/* 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) && ((a)->chunk_type != SCTP_IDATA))
#define IS_SCTP_DATA(a) (((a)->chunk_type == SCTP_DATA) || ((a)->chunk_type == SCTP_IDATA))

/* 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

/* RFC 6525 */
#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_STR_RESET_ADD_OUT_STREAMS  0x0011
#define SCTP_STR_RESET_ADD_IN_STREAMS   0x0012

#define SCTP_MAX_RESET_PARAMS 2
#define SCTP_STREAM_RESET_TSN_DELTA     0x1000

/*************0x4000 series*************/

/*************0x8000 series*************/
#define SCTP_ECN_CAPABLE                0x8000
#define SCTP_ZERO_CHECKSUM_ACCEPTABLE   0x8001
/* RFC 4895 */
#define SCTP_RANDOM                     0x8002
#define SCTP_CHUNK_LIST                 0x8003
#define SCTP_HMAC_LIST                  0x8004
/* RFC 4820 */
#define SCTP_PAD                        0x8005
/* RFC 5061 */
#define SCTP_SUPPORTED_CHUNK_EXT        0x8008

/*************0xC000 series*************/
#define SCTP_PRSCTP_SUPPORTED           0xc000
/* RFC 5061 */
#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
/* behave-nat-draft */
#define SCTP_HAS_NAT_SUPPORT            0xc007
#define SCTP_NAT_VTAGS                  0xc008

/* 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
 */
#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_IN_ACCEPT_QUEUE      0x1000
#define SCTP_STATE_MASK                 0x007f

#define SCTP_GET_STATE(_stcb) \
        ((_stcb)->asoc.state & SCTP_STATE_MASK)
#define SCTP_SET_STATE(_stcb, _state) \
        sctp_set_state(_stcb, _state)
#define SCTP_CLEAR_SUBSTATE(_stcb, _substate) \
        (_stcb)->asoc.state &= ~(_substate)
#define SCTP_ADD_SUBSTATE(_stcb, _substate) \
        sctp_add_substate(_stcb, _substate)

/* SCTP reachability state for each address */
#define SCTP_ADDR_REACHABLE             0x001
#define SCTP_ADDR_NO_PMTUD              0x002
#define SCTP_ADDR_NOHB                  0x004
#define SCTP_ADDR_BEING_DELETED         0x008
#define SCTP_ADDR_NOT_IN_ASSOC          0x010
#define SCTP_ADDR_OUT_OF_SCOPE          0x080
#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

/* 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

/* 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_STRRESET        13
#define SCTP_TIMER_TYPE_INPKILL         14
#define SCTP_TIMER_TYPE_ASOCKILL        15
#define SCTP_TIMER_TYPE_ADDR_WQ         16
#define SCTP_TIMER_TYPE_PRIM_DELETED    17
/* add new timers here - and increment LAST */
#define SCTP_TIMER_TYPE_LAST            18

#define SCTP_IS_TIMER_TYPE_VALID(t)     (((t) > SCTP_TIMER_TYPE_NONE) && \
                                         ((t) < SCTP_TIMER_TYPE_LAST))

/* 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.
 */
/* How many drop re-attempts we make on  INIT/COOKIE-ECHO */
#define SCTP_RETRY_DROPPED_THRESH 4

/*
 * 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

/*
 * 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

/*
 * 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_LOWER_BOUND    (1000)  /* 1 sec is ms */
#define SCTP_RTO_INITIAL        (1000)  /* 1 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_PATH_PF_THRESHOLD      SCTP_DEF_MAX_PATH_RTX

#define SCTP_DEF_PMTU_RAISE_SEC 600     /* 10 min between raise attempts */

/* How many streams I request initially by default */
#define SCTP_OSTREAM_INITIAL 10
#define SCTP_ISTREAM_INITIAL 2048

/*
 * How many smallest_mtu's need to increase before a window update sack is
 * sent (should be a power of 2).
 */
/* Send window update (incr * this > hiwat). Should be a power of 2 */
#define SCTP_MINIMAL_RWND               (4096)  /* minimal rwnd */

#define SCTP_ADDRMAX            16

/* 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_CRCOFFLOAD   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   /* emergency default MTU */
/* amount peer is obligated to have in rwnd or I will abort */
#define SCTP_MIN_RWND   1500

#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_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_SENT_DG_FAIL                 5
#define SCTP_NOTIFY_UNSENT_DG_FAIL               6
#define SCTP_NOTIFY_SPECIAL_SP_FAIL              7
#define SCTP_NOTIFY_ASSOC_LOC_ABORTED            8
#define SCTP_NOTIFY_ASSOC_REM_ABORTED            9
#define SCTP_NOTIFY_ASSOC_RESTART               10
#define SCTP_NOTIFY_PEER_SHUTDOWN               11
#define SCTP_NOTIFY_ASCONF_ADD_IP               12
#define SCTP_NOTIFY_ASCONF_DELETE_IP            13
#define SCTP_NOTIFY_ASCONF_SET_PRIMARY          14
#define SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION 15
#define SCTP_NOTIFY_INTERFACE_CONFIRMED         16
#define SCTP_NOTIFY_STR_RESET_RECV              17
#define SCTP_NOTIFY_STR_RESET_SEND              18
#define SCTP_NOTIFY_STR_RESET_FAILED_OUT        19
#define SCTP_NOTIFY_STR_RESET_FAILED_IN         20
#define SCTP_NOTIFY_STR_RESET_DENIED_OUT        21
#define SCTP_NOTIFY_STR_RESET_DENIED_IN         22
#define SCTP_NOTIFY_STR_RESET_ADD               23
#define SCTP_NOTIFY_STR_RESET_TSN               24
#define SCTP_NOTIFY_AUTH_NEW_KEY                25
#define SCTP_NOTIFY_AUTH_FREE_KEY               26
#define SCTP_NOTIFY_NO_PEER_AUTH                27
#define SCTP_NOTIFY_SENDER_DRY                  28
#define SCTP_NOTIFY_REMOTE_ERROR                29
#define SCTP_NOTIFY_ASSOC_TIMEDOUT              30

/* 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

/* Maximum length of diagnostic information in error causes */
#define SCTP_DIAG_INFO_LEN 128

/* 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_SYSCTL       0xb0000000
#define SCTP_FROM_SCTP_CC_FUNCTIONS 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
#define SCTP_LOC_34 0x00000022
#define SCTP_LOC_35 0x00000023
#define SCTP_LOC_36 0x00000024
#define SCTP_LOC_37 0x00000025

/* 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
#define SCTP_CALLED_FROM_INPKILL_TIMER    2
/* 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

/* modular comparison */
/* See RFC 1982 for details. */
#define SCTP_UINT16_GT(a, b) (((a < b) && ((uint16_t)(b - a) > (1U<<15))) || \
                              ((a > b) && ((uint16_t)(a - b) < (1U<<15))))
#define SCTP_UINT16_GE(a, b) (SCTP_UINT16_GT(a, b) || (a == b))
#define SCTP_UINT32_GT(a, b) (((a < b) && ((uint32_t)(b - a) > (1U<<31))) || \
                              ((a > b) && ((uint32_t)(a - b) < (1U<<31))))
#define SCTP_UINT32_GE(a, b) (SCTP_UINT32_GT(a, b) || (a == b))

#define SCTP_SSN_GT(a, b) SCTP_UINT16_GT(a, b)
#define SCTP_SSN_GE(a, b) SCTP_UINT16_GE(a, b)
#define SCTP_TSN_GT(a, b) SCTP_UINT32_GT(a, b)
#define SCTP_TSN_GE(a, b) SCTP_UINT32_GE(a, b)
#define SCTP_MID_GT(i, a, b) (((i) == 1) ? SCTP_UINT32_GT(a, b) : SCTP_UINT16_GT((uint16_t)a, (uint16_t)b))
#define SCTP_MID_GE(i, a, b) (((i) == 1) ? SCTP_UINT32_GE(a, b) : SCTP_UINT16_GE((uint16_t)a, (uint16_t)b))
#define SCTP_MID_EQ(i, a, b) (((i) == 1) ? a == b : (uint16_t)a == (uint16_t)b)

/* 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_CALC_TSN_TO_GAP(gap, tsn, mapping_tsn) do { \
                        if (tsn >= mapping_tsn) { \
                                                gap = tsn - mapping_tsn; \
                                        } else { \
                                                gap = (MAX_TSN - mapping_tsn) + tsn + 1; \
                                        } \
                  } while (0)

#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 yield 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   32

/*
 * Number of seconds of time wait for a vtag.
 */
#define SCTP_TIME_WAIT 60

/* How many micro seconds is the cutoff from
 * local lan type rtt's
 */
 /*
  * We allow 900us for the rtt.
  */
#define SCTP_LOCAL_LAN_RTT 900
#define SCTP_LAN_UNKNOWN  0
#define SCTP_LAN_LOCAL    1
#define SCTP_LAN_INTERNET 2

#define SCTP_SEND_BUFFER_SPLITTING 0x00000001
#define SCTP_RECV_BUFFER_SPLITTING 0x00000002

/* 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__
 */
#define SCTP_SO_LOCKED          1
#define SCTP_SO_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)

#define IN4_ISLINKLOCAL_ADDRESS(a) \
    ((((uint8_t *)&(a)->s_addr)[0] == 169) && \
     (((uint8_t *)&(a)->s_addr)[1] == 254))

/* Maximum size of optval for IPPROTO_SCTP level socket options. */
#define SCTP_SOCKET_OPTION_LIMIT (64 * 1024)

#if defined(_KERNEL)
#define SCTP_GETTIME_TIMEVAL(x) (getmicrouptime(x))
#define SCTP_GETPTIME_TIMEVAL(x) (microuptime(x))
#endif

#if defined(_KERNEL) || defined(__Userspace__)
#define sctp_sowwakeup(inp, so) \
do { \
        if (inp->sctp_flags & SCTP_PCB_FLAGS_DONT_WAKE) { \
                sctp_pcb_add_flags(inp, 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) { \
                sctp_pcb_add_flags(inp, SCTP_PCB_FLAGS_WAKEOUTPUT); \
                SOCKBUF_UNLOCK(&((so)->so_snd)); \
        } else { \
                sowwakeup_locked(so); \
        } \
} while (0)

#define sctp_sorwakeup(inp, so) \
do { \
        if (inp->sctp_flags & SCTP_PCB_FLAGS_DONT_WAKE) { \
                sctp_pcb_add_flags(inp, 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) { \
                sctp_pcb_add_flags(inp, SCTP_PCB_FLAGS_WAKEINPUT); \
                SOCKBUF_UNLOCK(&((so)->so_rcv)); \
        } else { \
                sorwakeup_locked(so); \
        } \
} while (0)

#endif                          /* _KERNEL || __Userspace__ */
#endif