text: /*-
   * 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.
   */
  
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD: head/sys/netinet/sctp_constants.h 363440 2020-07-23 01:35:24Z tuexen $");
  #endif
  
  #ifndef _NETINET_SCTP_CONSTANTS_H_
  #define _NETINET_SCTP_CONSTANTS_H_
  
  #if defined(_WIN32) && defined(__Userspace__)
  extern void getwintimeofday(struct timeval *tv);
  #endif
  
  /* 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
  #if defined(__Userspace__)
  #define SCTP_CONN_ADDRESS		0x0004
  #endif
  #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
  
  /* 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))
  
  
  #if defined(__APPLE__) && !defined(__Userspace__)
  /* Number of ticks to run the main timer at in msec */
  #define SCTP_MAIN_TIMER_DEFAULT		10
  #endif
  
  /* 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	(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_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
  #if defined(__Userspace__)
  #define SCTP_DEBUG_USR 		0x80000000
  #else
  #define SCTP_DEBUG_XXXXX	0x80000000	/* unused */
  #endif
  #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_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_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_AUTH_NEW_KEY                23
  #define SCTP_NOTIFY_AUTH_FREE_KEY               24
  #define SCTP_NOTIFY_NO_PEER_AUTH                25
  #define SCTP_NOTIFY_SENDER_DRY                  26
  #define SCTP_NOTIFY_REMOTE_ERROR                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
  
  /* Maximum length of diagnostic information in error causes */
  #define SCTP_DIAG_INFO_LEN 256
  
  /* 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
  
  #if defined(__FreeBSD__) && !defined(__Userspace__)
  /* clock variance is 1 ms */
  #define SCTP_CLOCK_GRANULARITY	1
  #else
  /* clock variance is 10 ms */
  #define SCTP_CLOCK_GRANULARITY	10
  #endif
  #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(__Userspace__)
  #if defined(_WIN32)
  #define SCTP_GETTIME_TIMEVAL(x)	getwintimeofday(x)
  #define SCTP_GETPTIME_TIMEVAL(x) getwintimeofday(x) /* this doesn't seem to ever be used.. */
  #else
  #define SCTP_GETTIME_TIMEVAL(x)	gettimeofday(x, NULL)
  #define SCTP_GETPTIME_TIMEVAL(x) gettimeofday(x, NULL)
  #endif
  #endif
  
  #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) { \
  		inp->sctp_flags |= SCTP_PCB_FLAGS_WAKEOUTPUT; \
  	} else { \
  		sowwakeup(so); \
  	} \
  } while (0)
  
  #if defined(__FreeBSD__) || defined(_WIN32) || defined(__Userspace__)
  #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)
  #else
  #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(so); \
  	} \
  } while (0)
  #endif
  
  #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)
  
  #if defined(__FreeBSD__) || defined(_WIN32) || defined(__Userspace__)
  #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)
  #else
  
  #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(so); \
  	} \
  } while (0)
  #endif
  
  #endif				/* _KERNEL || __Userspace__*/
  #endif
  