/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License, Version 1.0 only

 * (the "License").  You may not use this file except in compliance

 * with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

/* Copyright (c) 1990 Mentat Inc. */

#ifndef	_INET_TCP_H

#define	_INET_TCP_H

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#ifdef	__cplusplus

extern "C" {

#endif

#include <sys/inttypes.h>

#include <netinet/ip6.h>

#include <netinet/tcp.h>

#include <inet/tcp_sack.h>

#include <sys/socket.h>

#include <sys/multidata.h>

/*

 * Private (and possibly temporary) ioctl used by configuration code

 * to lock in the "default" stream for detached closes.

 */

#define	TCP_IOC_DEFAULT_Q	(('T' << 8) + 51)

/* TCP states */

#define	TCPS_CLOSED		-6

#define	TCPS_IDLE		-5	/* idle (opened, but not bound) */

#define	TCPS_BOUND		-4	/* bound, ready to connect or accept */

#define	TCPS_LISTEN		-3	/* listening for connection */

#define	TCPS_SYN_SENT		-2	/* active, have sent syn */

#define	TCPS_SYN_RCVD		-1	/* have received syn (and sent ours) */

/* states < TCPS_ESTABLISHED are those where connections not established */

#define	TCPS_ESTABLISHED	0	/* established */

#define	TCPS_CLOSE_WAIT		1	/* rcvd fin, waiting for close */

/* states > TCPS_CLOSE_WAIT are those where user has closed */

#define	TCPS_FIN_WAIT_1		2	/* have closed and sent fin */

#define	TCPS_CLOSING		3	/* closed, xchd FIN, await FIN ACK */

#define	TCPS_LAST_ACK		4	/* had fin and close; await FIN ACK */

/* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */

#define	TCPS_FIN_WAIT_2		5	/* have closed, fin is acked */

#define	TCPS_TIME_WAIT		6	/* in 2*msl quiet wait after close */

/*

 * Internal flags used in conjunction with the packet header flags.

 * Used in tcp_rput_data to keep track of what needs to be done.

 */

#define	TH_LIMIT_XMIT		0x0400	/* Limited xmit is needed */

#define	TH_XMIT_NEEDED		0x0800	/* Window opened - send queued data */

#define	TH_REXMIT_NEEDED	0x1000	/* Time expired for unacked data */

#define	TH_ACK_NEEDED		0x2000	/* Send an ack now. */

#define	TH_NEED_SACK_REXMIT	0x4000	/* Use SACK info to retransmission */

#define	TH_ACK_TIMER_NEEDED	0x8000	/* Start the delayed ACK timer */

#define	TH_ORDREL_NEEDED	0x10000	/* Generate an ordrel indication */

#define	TH_MARKNEXT_NEEDED	0x20000	/* Data should have MSGMARKNEXT */

#define	TH_SEND_URP_MARK	0x40000	/* Send up tcp_urp_mark_mp */

/*

 * TCP sequence numbers are 32 bit integers operated

 * on with modular arithmetic.  These macros can be

 * used to compare such integers.

 */

#define	SEQ_LT(a, b)	((int32_t)((a)-(b)) < 0)

#define	SEQ_LEQ(a, b)	((int32_t)((a)-(b)) <= 0)

#define	SEQ_GT(a, b)	((int32_t)((a)-(b)) > 0)

#define	SEQ_GEQ(a, b)	((int32_t)((a)-(b)) >= 0)

/* TCP Protocol header */

typedef	struct tcphdr_s {

	uint8_t		th_lport[2];	/* Source port */

	uint8_t		th_fport[2];	/* Destination port */

	uint8_t		th_seq[4];	/* Sequence number */

	uint8_t		th_ack[4];	/* Acknowledgement number */

	uint8_t		th_offset_and_rsrvd[1]; /* Offset to the packet data */

	uint8_t		th_flags[1];

	uint8_t		th_win[2];	/* Allocation number */

	uint8_t		th_sum[2];	/* TCP checksum */

	uint8_t		th_urp[2];	/* Urgent pointer */

} tcph_t;

#define	TCP_HDR_LENGTH(tcph) (((tcph)->th_offset_and_rsrvd[0] >>2) &(0xF << 2))

#define	TCP_MAX_COMBINED_HEADER_LENGTH	(60 + 60) /* Maxed out ip + tcp */

#define	TCP_MAX_IP_OPTIONS_LENGTH	(60 - IP_SIMPLE_HDR_LENGTH)

#define	TCP_MAX_HDR_LENGTH		60

#define	TCP_MAX_TCP_OPTIONS_LENGTH	(60 - sizeof (tcph_t))

#define	TCP_MIN_HEADER_LENGTH		20

#define	TCP_MAXWIN			65535

#define	TCP_PORT_LEN			sizeof (in_port_t)

#define	TCP_MAX_WINSHIFT		14

#define	TCP_MAX_LARGEWIN		(TCP_MAXWIN << TCP_MAX_WINSHIFT)

#define	TCPIP_HDR_LENGTH(mp, n)					\

	(n) = IPH_HDR_LENGTH((mp)->b_rptr),			\

	(n) += TCP_HDR_LENGTH((tcph_t *)&(mp)->b_rptr[(n)])

/* TCP Protocol header (used if the header is known to be 32-bit aligned) */

typedef	struct tcphdra_s {

	in_port_t	tha_lport;	/* Source port */

	in_port_t	tha_fport;	/* Destination port */

	uint32_t	tha_seq;	/* Sequence number */

	uint32_t	tha_ack;	/* Acknowledgement number */

	uint8_t tha_offset_and_reserved; /* Offset to the packet data */

	uint8_t		tha_flags;

	uint16_t	tha_win;	/* Allocation number */

	uint16_t	tha_sum;	/* TCP checksum */

	uint16_t	tha_urp;	/* Urgent pointer */

} tcpha_t;

struct conn_s;

/*

 * Control structure for each open TCP stream,

 * defined only within the kernel or for a kmem user.

 * NOTE: tcp_reinit_values MUST have a line for each field in this structure!

 */

#if (defined(_KERNEL) || defined(_KMEMUSER))

typedef struct tcp_s {

				/* Pointer to previous bind hash next. */

	struct tcp_s *tcp_time_wait_next;

				/* Pointer to next T/W block */

	struct tcp_s *tcp_time_wait_prev;

				/* Pointer to previous T/W next */

	clock_t	tcp_time_wait_expire;

	struct conn_s *tcp_connp;

	int32_t	tcp_state;

	int32_t	tcp_rcv_ws;		/* My window scale power */

	int32_t	tcp_snd_ws;		/* Sender's window scale power */

	uint32_t tcp_ts_recent;		/* Timestamp of earliest unacked */

					/*  data segment */

	clock_t	tcp_rto;		/* Round trip timeout */

	clock_t	tcp_last_rcv_lbolt;

				/* lbolt on last packet, used for PAWS */

	uint32_t tcp_snxt;		/* Senders next seq num */

	uint32_t tcp_swnd;		/* Senders window (relative to suna) */

	uint32_t tcp_mss;		/* Max segment size */

	uint32_t tcp_iss;		/* Initial send seq num */

	uint32_t tcp_rnxt;		/* Seq we expect to recv next */

	uint32_t tcp_rwnd;

	queue_t	*tcp_rq;		/* Our upstream neighbor (client) */

	queue_t	*tcp_wq;		/* Our downstream neighbor */

	/* Fields arranged in approximate access order along main paths */

	mblk_t	*tcp_xmit_head;		/* Head of rexmit list */

	mblk_t	*tcp_xmit_last;		/* last valid data seen by tcp_wput */

	mblk_t	*tcp_xmit_tail;		/* Last rexmit data sent */

	uint32_t tcp_unsent;		/* # of bytes in hand that are unsent */

	uint32_t tcp_xmit_tail_unsent;	/* # of unsent bytes in xmit_tail */

	uint32_t tcp_suna;		/* Sender unacknowledged */

	uint32_t tcp_rexmit_nxt;	/* Next rexmit seq num */

	uint32_t tcp_rexmit_max;	/* Max retran seq num */

	int32_t	tcp_snd_burst;		/* Send burst factor */

	uint32_t tcp_cwnd;		/* Congestion window */

	int32_t tcp_cwnd_cnt;		/* cwnd cnt in congestion avoidance */

	uint32_t tcp_ibsegs;		/* Inbound segments on this stream */

	uint32_t tcp_obsegs;		/* Outbound segments on this stream */

	uint32_t tcp_naglim;		/* Tunable nagle limit */

	uint32_t	tcp_valid_bits;

#define	TCP_ISS_VALID	0x1	/* Is the tcp_iss seq num active? */

#define	TCP_FSS_VALID	0x2	/* Is the tcp_fss seq num active? */

#define	TCP_URG_VALID	0x4	/* Is the tcp_urg seq num active? */

#define	TCP_OFO_FIN_VALID 0x8	/* Has TCP received an out of order FIN? */

	int32_t	tcp_xmit_hiwater;	/* Send buffer high water mark. */

	timeout_id_t	tcp_timer_tid;	/* Control block for timer service */

	uchar_t	tcp_timer_backoff;	/* Backoff shift count. */

	int64_t tcp_last_recv_time;	/* Last time we receive a segment. */

	uint32_t tcp_init_cwnd;		/* Initial cwnd (start/restart) */

	/*

	 * Following socket options are set by sockfs outside the squeue

	 * and we want to separate these bit fields from the other bit fields

	 * set by TCP to avoid grabbing locks. sockfs ensures that only one

	 * thread in sockfs can set a socket option at a time on a conn_t.

	 * However TCP may read these options concurrently. The linger option

	 * needs atomicity since tcp_lingertime also needs to be in sync.

	 * However TCP uses it only during close, and by then no socket option

	 * can come down. So we don't need any locks, instead just separating

	 * the sockfs settable bit fields from the other bit fields is

	 * sufficient.

	 */

	uint32_t

		tcp_debug : 1,		/* SO_DEBUG "socket" option. */

		tcp_dontroute : 1,	/* SO_DONTROUTE "socket" option. */

		tcp_broadcast : 1,	/* SO_BROADCAST "socket" option. */

		tcp_useloopback : 1,	/* SO_USELOOPBACK "socket" option. */

		tcp_oobinline : 1,	/* SO_OOBINLINE "socket" option. */

		tcp_dgram_errind : 1,	/* SO_DGRAM_ERRIND option */

		tcp_linger : 1,		/* SO_LINGER turned on */

		tcp_reuseaddr	: 1,	/* SO_REUSEADDR "socket" option. */

		tcp_junk_to_bit_31 : 24;

	/* Following manipulated by TCP under squeue protection */

	uint32_t

		tcp_urp_last_valid : 1,	/* Is tcp_urp_last valid? */

		tcp_hard_binding : 1,	/* If we've started a full bind */

		tcp_hard_bound : 1,	/* If we've done a full bind with IP */

		tcp_fin_acked : 1,	/* Has our FIN been acked? */

		tcp_fin_rcvd : 1,	/* Have we seen a FIN? */

		tcp_fin_sent : 1,	/* Have we sent our FIN yet? */

		tcp_ordrel_done : 1,	/* Have we sent the ord_rel upstream? */

		tcp_flow_stopped : 1,	/* Have we flow controlled xmitter? */

		tcp_detached : 1,	/* If we're detached from a stream */

		tcp_bind_pending : 1,	/* Client is waiting for bind ack */

		tcp_unbind_pending : 1, /* Client sent T_UNBIND_REQ */

		tcp_deferred_clean_death : 1,

					/* defer tcp endpoint cleanup etc. */

		tcp_conn_def_q0: 1,	/* move from q0 to q deferred */

		tcp_ka_enabled: 1,	/* Connection KeepAlive Timer needed */

		tcp_zero_win_probe: 1,	/* Zero win probing is in progress */

		tcp_loopback: 1,	/* src and dst are the same machine */

		tcp_localnet: 1,	/* src and dst are on the same subnet */

		tcp_syn_defense: 1,	/* For defense against SYN attack */

#define	tcp_dontdrop	tcp_syn_defense

		tcp_set_timer : 1,

		tcp_active_open: 1,	/* This is a active open */

		tcp_timeout : 1,	/* qbufcall failed, qtimeout pending */

		tcp_rexmit : 1,		/* TCP is retransmitting */

		tcp_snd_sack_ok : 1,	/* Can use SACK for this connection */

		tcp_empty_flag : 1,	/* Empty flag for future use */

		tcp_recvdstaddr : 1,	/* return T_EXTCONN_IND with dst addr */

		tcp_hwcksum : 1,	/* The NIC is capable of hwcksum */

		tcp_ip_forward_progress : 1,

		tcp_anon_priv_bind : 1,

		tcp_ecn_ok : 1,		/* Can use ECN for this connection */

		tcp_ecn_echo_on : 1,	/* Need to do ECN echo */

		tcp_ecn_cwr_sent : 1,	/* ECN_CWR has been sent */

		tcp_cwr : 1;		/* Cwnd has reduced recently */

	/* Following manipulated by TCP under squeue protection */

	uint32_t

		tcp_mdt : 1,		/* Lower layer is capable of MDT */

		tcp_snd_ts_ok  : 1,

		tcp_snd_ws_ok  : 1,

		tcp_exclbind	: 1,	/* ``exclusive'' binding */

		tcp_reserved_port : 1,

		tcp_hdr_grown	: 1,

		tcp_in_free_list : 1,

		tcp_snd_zcopy_on : 1,	/* xmit zero-copy enabled */

		tcp_snd_zcopy_aware : 1, /* client is zero-copy aware */

		tcp_xmit_zc_clean : 1,	/* the xmit list is free of zc-mblk */

		tcp_wait_for_eagers : 1, /* Wait for eagers to disappear */

		tcp_accept_error : 1,	/* Error during TLI accept */

		tcp_send_discon_ind : 1, /* TLI accept err, send discon ind */

		tcp_cork : 1,		/* tcp_cork option */

	uint32_t	tcp_if_mtu;	/* Outgoing interface MTU. */

	mblk_t	*tcp_reass_head;	/* Out of order reassembly list head */

	mblk_t	*tcp_reass_tail;	/* Out of order reassembly list tail */

	tcp_sack_info_t	*tcp_sack_info;

#define	tcp_pipe	tcp_sack_info->tcp_pipe

#define	tcp_fack	tcp_sack_info->tcp_fack

#define	tcp_sack_snxt	tcp_sack_info->tcp_sack_snxt

#define	tcp_max_sack_blk	tcp_sack_info->tcp_max_sack_blk

#define	tcp_num_sack_blk	tcp_sack_info->tcp_num_sack_blk

#define	tcp_sack_list		tcp_sack_info->tcp_sack_list

#define	tcp_num_notsack_blk	tcp_sack_info->tcp_num_notsack_blk

#define	tcp_cnt_notsack_list	tcp_sack_info->tcp_cnt_notsack_list

#define	tcp_notsack_list		tcp_sack_info->tcp_notsack_list

	mblk_t	*tcp_rcv_list;		/* Queued until push, urgent data, */

	mblk_t	*tcp_rcv_last_head;	/* optdata, or the count exceeds */

	mblk_t	*tcp_rcv_last_tail;	/* tcp_rcv_push_wait. */

	uint32_t tcp_rcv_cnt;		/* tcp_rcv_list is b_next chain. */

	uint32_t tcp_cwnd_ssthresh;	/* Congestion window */

	uint32_t tcp_cwnd_max;

	uint32_t tcp_csuna;		/* Clear (no rexmits in window) suna */

	clock_t	tcp_rtt_sa;		/* Round trip smoothed average */

	clock_t	tcp_rtt_sd;		/* Round trip smoothed deviation */

	clock_t	tcp_rtt_update;		/* Round trip update(s) */

	clock_t tcp_ms_we_have_waited;	/* Total retrans time */

	uint32_t tcp_swl1;		/* These help us avoid using stale */

	uint32_t tcp_swl2;		/*  packets to update state */

	uint32_t tcp_rack;		/* Seq # we have acked */

	uint32_t tcp_rack_cnt;		/* # of segs we have deferred ack */

	uint32_t tcp_rack_cur_max;	/* # of segs we may defer ack for now */

	uint32_t tcp_rack_abs_max;	/* # of segs we may defer ack ever */

	timeout_id_t	tcp_ack_tid;	/* Delayed ACK timer ID */

	timeout_id_t	tcp_push_tid;	/* Push timer ID */

	uint32_t tcp_max_swnd;		/* Maximum swnd we have seen */

	struct tcp_s *tcp_listener;	/* Our listener */

	int32_t	tcp_xmit_lowater;	/* Send buffer low water mark. */

	uint32_t tcp_irs;		/* Initial recv seq num */

	uint32_t tcp_fss;		/* Final/fin send seq num */

	uint32_t tcp_urg;		/* Urgent data seq num */

	clock_t	tcp_first_timer_threshold;  /* When to prod IP */

	clock_t	tcp_second_timer_threshold; /* When to give up completely */

	clock_t	tcp_first_ctimer_threshold; /* 1st threshold while connecting */

	clock_t tcp_second_ctimer_threshold; /* 2nd ... while connecting */

	int	tcp_lingertime;		/* Close linger time (in seconds) */

	uint32_t tcp_urp_last;		/* Last urp for which signal sent */

	mblk_t	*tcp_urp_mp;		/* T_EXDATA_IND for urgent byte */

	mblk_t	*tcp_urp_mark_mp;	/* zero-length marked/unmarked msg */

	int tcp_conn_req_cnt_q0;	/* # of conn reqs in SYN_RCVD */

	int tcp_conn_req_cnt_q;	/* # of conn reqs in ESTABLISHED */

	int tcp_conn_req_max;	/* # of ESTABLISHED conn reqs allowed */

	t_scalar_t tcp_conn_req_seqnum;	/* Incrementing pending conn req ID */

#define	tcp_ip_addr_cache	tcp_reass_tail

					/* Cache ip addresses that */

					/* complete the 3-way handshake */

	kmutex_t  tcp_eager_lock;

	struct tcp_s *tcp_eager_next_q; /* next eager in ESTABLISHED state */

	struct tcp_s *tcp_eager_last_q;	/* last eager in ESTABLISHED state */

	struct tcp_s *tcp_eager_next_q0; /* next eager in SYN_RCVD state */

	struct tcp_s *tcp_eager_prev_q0; /* prev eager in SYN_RCVD state */

					/* all eagers form a circular list */

	union {

	    mblk_t *tcp_eager_conn_ind; /* T_CONN_IND waiting for 3rd ack. */

	    mblk_t *tcp_opts_conn_req; /* T_CONN_REQ w/ options processed */

	} tcp_conn;

	uint32_t tcp_syn_rcvd_timeout;	/* How many SYN_RCVD timeout in q0 */

	/* TCP Keepalive Timer members */

	int32_t	tcp_ka_last_intrvl;	/* Last probe interval */

	timeout_id_t tcp_ka_tid;	/* Keepalive timer ID */

	uint32_t tcp_ka_interval;	/* Keepalive interval */

	uint32_t tcp_ka_abort_thres;	/* Keepalive abort threshold */

	int32_t	tcp_client_errno;	/* How the client screwed up */

	char	*tcp_iphc;		/* Buffer holding tcp/ip hdr template */

	int	tcp_iphc_len;		/* actual allocated buffer size */

	int32_t	tcp_hdr_len;		/* Byte len of combined TCP/IP hdr */

	ipha_t	*tcp_ipha;		/* IPv4 header in the buffer */

	ip6_t	*tcp_ip6h;		/* IPv6 header in the buffer */

	int	tcp_ip_hdr_len;		/* Byte len of our current IPvx hdr */

	tcph_t	*tcp_tcph;		/* tcp header within combined hdr */

	int32_t	tcp_tcp_hdr_len;	/* tcp header len within combined */

	uint32_t tcp_sum;		/* checksum to compensate for source */

					/* routed packets. Host byte order */

	uint16_t tcp_last_sent_len;	/* Record length for nagle */

	uint16_t tcp_dupack_cnt;	/* # of consequtive duplicate acks */

	kmutex_t	*tcp_acceptor_lockp;	/* Ptr to tf_lock */

	timeout_id_t	tcp_ordrelid;		/* qbufcall/qtimeout id */

	t_uscalar_t	tcp_acceptor_id;	/* ACCEPTOR_id */

	int		tcp_ipsec_overhead;

	/*

	 * Address family that app wishes returned addrsses to be in.

	 * Currently taken from address family used in T_BIND_REQ, but

	 * should really come from family used in original socket() call.

	 * Value can be AF_INET or AF_INET6.

	 */

	uint_t	tcp_family;

	/*

	 * used for a quick test to determine if any ancillary bits are

	 * set

	 */

	uint_t		tcp_ipv6_recvancillary;		/* Flags */

#define	TCP_IPV6_RECVPKTINFO	0x01	/* IPV6_RECVPKTINFO option  */

#define	TCP_IPV6_RECVHOPLIMIT	0x02	/* IPV6_RECVHOPLIMIT option */

#define	TCP_IPV6_RECVHOPOPTS	0x04	/* IPV6_RECVHOPOPTS option */

#define	TCP_IPV6_RECVDSTOPTS	0x08	/* IPV6_RECVDSTOPTS option */

#define	TCP_IPV6_RECVRTHDR	0x10	/* IPV6_RECVRTHDR option */

#define	TCP_IPV6_RECVRTDSTOPTS	0x20	/* IPV6_RECVRTHDRDSTOPTS option */

#define	TCP_IPV6_RECVTCLASS	0x40	/* IPV6_RECVTCLASS option */

#define	TCP_OLD_IPV6_RECVDSTOPTS 0x80	/* old IPV6_RECVDSTOPTS option */

	uint_t		tcp_recvifindex; /* Last received IPV6_RCVPKTINFO */

	uint_t		tcp_recvhops;	/* Last received IPV6_RECVHOPLIMIT */

	uint_t		tcp_recvtclass;	/* Last received IPV6_RECVTCLASS */

	ip6_hbh_t	*tcp_hopopts;	/* Last received IPV6_RECVHOPOPTS */

	ip6_dest_t	*tcp_dstopts;	/* Last received IPV6_RECVDSTOPTS */

	ip6_dest_t	*tcp_rtdstopts;	/* Last recvd IPV6_RECVRTHDRDSTOPTS */

	ip6_rthdr_t	*tcp_rthdr;	/* Last received IPV6_RECVRTHDR */

	uint_t		tcp_hopoptslen;

	uint_t		tcp_dstoptslen;

	uint_t		tcp_rtdstoptslen;

	uint_t		tcp_rthdrlen;

	mblk_t		*tcp_timercache;

	cred_t		*tcp_cred;	/* Credentials when this was opened */

	pid_t		tcp_cpid;	/* Process id when this was opened */

	union {

		struct {

			uchar_t	v4_ttl;

				/* Dup of tcp_ipha.iph_type_of_service */

			uchar_t	v4_tos; /* Dup of tcp_ipha.iph_ttl */

		} v4_hdr_info;

		struct {

			uint_t	v6_vcf;		/* Dup of tcp_ip6h.ip6h_vcf */

			uchar_t	v6_hops;	/* Dup of tcp_ip6h.ip6h_hops */

		} v6_hdr_info;

	} tcp_hdr_info;

#define	tcp_ttl	tcp_hdr_info.v4_hdr_info.v4_ttl

#define	tcp_tos	tcp_hdr_info.v4_hdr_info.v4_tos

#define	tcp_ip6_vcf	tcp_hdr_info.v6_hdr_info.v6_vcf

#define	tcp_ip6_hops	tcp_hdr_info.v6_hdr_info.v6_hops

	ushort_t	tcp_ipversion;

	uint_t		tcp_bound_if;	/* IPV6_BOUND_IF */

#define	tcp_lport	tcp_connp->conn_lport

#define	tcp_fport	tcp_connp->conn_fport

#define	tcp_ports	tcp_connp->conn_ports

#define	tcp_remote	tcp_connp->conn_rem

#define	tcp_ip_src	tcp_connp->conn_src

#define	tcp_remote_v6	tcp_connp->conn_remv6

#define	tcp_ip_src_v6	tcp_connp->conn_srcv6

#define	tcp_bound_source_v6	tcp_connp->conn_bound_source_v6

#define	tcp_bound_source	tcp_connp->conn_bound_source

	kmutex_t	tcp_closelock;

	kcondvar_t	tcp_closecv;

	uint8_t		tcp_closed;

	uint8_t		tcp_closeflags;

	uint8_t		tcp_cleandeathtag;

	mblk_t		tcp_closemp;

	timeout_id_t	tcp_linger_tid;	/* Linger timer ID */

	void		*tcp_tracebuf;

	struct tcp_s *tcp_acceptor_hash; /* Acceptor hash chain */

	struct tcp_s **tcp_ptpahn; /* Pointer to previous accept hash next. */

	struct tcp_s *tcp_bind_hash; /* Bind hash chain */

	struct tcp_s **tcp_ptpbhn;

	boolean_t	tcp_ire_ill_check_done;

	uint_t		tcp_maxpsz;

	/*

	 * used for Multidata Transmit

	 */

	uint_t	tcp_mdt_hdr_head; /* leading header fragment extra space */

	uint_t	tcp_mdt_hdr_tail; /* trailing header fragment extra space */

	int	tcp_mdt_max_pld;  /* maximum payload buffers per Multidata */

	uint32_t	tcp_ofo_fin_seq; /* Recv out of order FIN seq num */

	uint32_t	tcp_cwr_snd_max;

	uint_t		tcp_drop_opt_ack_cnt; /* # tcp generated optmgmt */

	ip6_pkt_t	tcp_sticky_ipp;			/* Sticky options */

#define	tcp_ipp_fields	tcp_sticky_ipp.ipp_fields	/* valid fields */

#define	tcp_ipp_ifindex	tcp_sticky_ipp.ipp_ifindex	/* pktinfo ifindex */

#define	tcp_ipp_addr	tcp_sticky_ipp.ipp_addr	/* pktinfo src/dst addr */

#define	tcp_ipp_hoplimit	tcp_sticky_ipp.ipp_hoplimit

#define	tcp_ipp_hopoptslen	tcp_sticky_ipp.ipp_hopoptslen

#define	tcp_ipp_rtdstoptslen	tcp_sticky_ipp.ipp_rtdstoptslen

#define	tcp_ipp_rthdrlen	tcp_sticky_ipp.ipp_rthdrlen

#define	tcp_ipp_dstoptslen	tcp_sticky_ipp.ipp_dstoptslen

#define	tcp_ipp_hopopts		tcp_sticky_ipp.ipp_hopopts

#define	tcp_ipp_rtdstopts	tcp_sticky_ipp.ipp_rtdstopts

#define	tcp_ipp_rthdr		tcp_sticky_ipp.ipp_rthdr

#define	tcp_ipp_dstopts		tcp_sticky_ipp.ipp_dstopts

#define	tcp_ipp_nexthop		tcp_sticky_ipp.ipp_nexthop

#define	tcp_ipp_use_min_mtu	tcp_sticky_ipp.ipp_use_min_mtu

	struct tcp_s *tcp_saved_listener;	/* saved value of listener */

	struct tcp_s *tcp_loopback_peer;	/* peer tcp for loopback */

	mblk_t	*tcp_fused_sigurg_mp;		/* M_PCSIG mblk for SIGURG */