xnu-6153.61.1.tar.gz

[apple/xnu.git] / bsd / netinet / tcp_var.h

diff --git a/bsd/netinet/tcp_var.h b/bsd/netinet/tcp_var.h
index 7b71c561a70e3a6f1fbf4fefe3635eba9666e272..95e1903ee5da3e5bb8ba6df6aa0f4637326c4f7d 100644 (file)
--- a/bsd/netinet/tcp_var.h
+++ b/bsd/netinet/tcp_var.h
@@ -1,8 +1,8 @@
 /*
 /*

- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2019 Apple Inc. All rights reserved.

  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@

- * 
+ *

  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
  * Version 2.0 (the 'License'). You may not use this file except in
  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
  * Version 2.0 (the 'License'). You may not use this file except in


@@ -11,10 +11,10 @@
  * unlawful or unlicensed copies of an Apple operating system, or to
  * circumvent, violate, or enable the circumvention or violation of, any
  * terms of an Apple operating system software license agreement.
  * unlawful or unlicensed copies of an Apple operating system, or to
  * circumvent, violate, or enable the circumvention or violation of, any
  * terms of an Apple operating system software license agreement.

- * 
+ *

  * Please obtain a copy of the License at
  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  * Please obtain a copy of the License at
  * http://www.opensource.apple.com/apsl/ and read it before using this file.

- * 
+ *

  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,


@@ -22,7 +22,7 @@
  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  * Please see the License for the specific language governing rights and
  * limitations under the License.
  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  * Please see the License for the specific language governing rights and
  * limitations under the License.

- * 
+ *

  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 /*
  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 /*


@@ -63,14 +63,87 @@
 
 #ifndef _NETINET_TCP_VAR_H_
 #define _NETINET_TCP_VAR_H_
 
 #ifndef _NETINET_TCP_VAR_H_
 #define _NETINET_TCP_VAR_H_

+#include <sys/types.h>

 #include <sys/appleapiopts.h>
 #include <sys/queue.h>
 #include <netinet/in_pcb.h>
 #include <sys/appleapiopts.h>
 #include <sys/queue.h>
 #include <netinet/in_pcb.h>

+#include <netinet/tcp.h>

 #include <netinet/tcp_timer.h>
 
 #include <netinet/tcp_timer.h>
 

+#if defined(__LP64__)
+#define _TCPCB_PTR(x)                   u_int32_t
+#define _TCPCB_LIST_HEAD(name, type)    \
+struct name {                           \
+       u_int32_t       lh_first;       \
+}
+#else
+#define _TCPCB_PTR(x)                   x
+#define _TCPCB_LIST_HEAD(name, type)    LIST_HEAD(name, type)
+#endif
+

 #ifdef KERNEL_PRIVATE
 
 #ifdef KERNEL_PRIVATE
 

-#define N_TIME_WAIT_SLOTS   128                /* must be power of 2 */
+#define TCP_RETRANSHZ   1000    /* granularity of TCP timestamps, 1ms */
+/* Minimum time quantum within which the timers are coalesced */
+#define TCP_TIMER_10MS_QUANTUM  (TCP_RETRANSHZ/100) /* every 10ms */
+#define TCP_TIMER_100MS_QUANTUM   (TCP_RETRANSHZ/10) /* every 100ms */
+#define TCP_TIMER_500MS_QUANTUM   (TCP_RETRANSHZ/2) /* every 500ms */
+
+#define TCP_RETRANSHZ_TO_USEC 1000
+
+#define N_TIME_WAIT_SLOTS   128         /* must be power of 2 */
+
+/* Always allow at least 16 packets worth of recv window when adjusting
+ * recv window using inter-packet arrival jitter.
+ */
+#define MIN_IAJ_WIN 16
+
+/* A variation in delay of this many milliseconds is tolerable. This limit has to
+ * be low but greater than zero. We also use standard deviation on jitter to adjust
+ * this limit for different link and connection types.
+ */
+#define ALLOWED_IAJ 5
+
+/* Ignore the first few packets on a connection until the ACK clock gets going
+ */
+#define IAJ_IGNORE_PKTCNT 40
+
+/* Let the accumulated IAJ value increase by this threshold at most. This limit
+ * will control how many ALLOWED_IAJ measurements a receiver will have to see
+ * before opening the receive window
+ */
+#define ACC_IAJ_HIGH_THRESH 100
+
+/* When accumulated IAJ reaches this value, the receiver starts to react by
+ * closing the window
+ */
+#define ACC_IAJ_REACT_LIMIT 200
+
+/* If the number of small packets (smaller than IAJ packet size) seen on a
+ * connection is more than this threshold, reset the size and learn it again.
+ * This is needed because the sender might send smaller segments after PMTU
+ * discovery and the receiver has to learn the new size.
+ */
+#define RESET_IAJ_SIZE_THRESH 20
+
+/*
+ * Adaptive timeout is a read/write timeout specified by the application to
+ * get a socket event when the transport layer detects a stall in data
+ * transfer. The value specified is the number of probes that can be sent
+ * to the peer before generating an event. Since it is not specified as
+ * a time value, the timeout will adjust based on the RTT seen on the link.
+ * The timeout will start only when there is an indication that the read/write
+ * operation is not making progress.
+ *
+ * If a write operation stalls, the probe will be retransmission of data.
+ * If a read operation stalls, the probe will be a keep-alive packet.
+ *
+ * The maximum value of adaptive timeout is set to 10 which will allow
+ * transmission of enough number of probes to the peer.
+ */
+#define TCP_ADAPTIVE_TIMEOUT_MAX        10
+
+#define TCP_CONNECTIVITY_PROBES_MAX     5

 
 /*
  * Kernel variables for tcp.
 
 /*
  * Kernel variables for tcp.


@@ -79,182 +152,584 @@
 /* TCP segment queue entry */
 struct tseg_qent {
        LIST_ENTRY(tseg_qent) tqe_q;
 /* TCP segment queue entry */
 struct tseg_qent {
        LIST_ENTRY(tseg_qent) tqe_q;

-       int     tqe_len;                /* TCP segment data length */
-       struct  tcphdr *tqe_th;         /* a pointer to tcp header */
-       struct  mbuf    *tqe_m;         /* mbuf contains packet */
+       int     tqe_len;                /* TCP segment data length */
+       struct  tcphdr *tqe_th;         /* a pointer to tcp header */
+       struct  mbuf    *tqe_m;         /* mbuf contains packet */

 };
 LIST_HEAD(tsegqe_head, tseg_qent);
 };
 LIST_HEAD(tsegqe_head, tseg_qent);

-extern int     tcp_reass_maxseg;
-extern int     tcp_reass_qsize;
-#ifdef MALLOC_DECLARE
-MALLOC_DECLARE(M_TSEGQ);
-#endif

 
 struct sackblk {
 
 struct sackblk {

-       tcp_seq start;          /* start seq no. of sack block */
-       tcp_seq end;            /* end seq no. */
+       tcp_seq start;          /* start seq no. of sack block */
+       tcp_seq end;            /* end seq no. */

 };
 
 struct sackhole {
 };
 
 struct sackhole {

-       tcp_seq start;          /* start seq no. of hole */
-       tcp_seq end;            /* end seq no. */
-       tcp_seq rxmit;          /* next seq. no in hole to be retransmitted */
-       TAILQ_ENTRY(sackhole) scblink;  /* scoreboard linkage */
+       tcp_seq start;          /* start seq no. of hole */
+       tcp_seq end;            /* end seq no. */
+       tcp_seq rxmit;          /* next seq. no in hole to be retransmitted */
+       u_int32_t rxmit_start;  /* timestamp of first retransmission */
+       TAILQ_ENTRY(sackhole) scblink;  /* scoreboard linkage */

 };
 
 struct sackhint {
 };
 
 struct sackhint {

-       struct sackhole *nexthole;
-       int     sack_bytes_rexmit;
+       struct sackhole *nexthole;
+       int     sack_bytes_rexmit;
+};
+
+struct tcp_rxt_seg {
+       tcp_seq rx_start;
+       tcp_seq rx_end;
+       u_int16_t rx_count;
+       u_int16_t rx_flags;
+#define TCP_RXT_SPURIOUS        0x1     /* received DSACK notification */
+#define TCP_RXT_DSACK_FOR_TLP   0x2
+       SLIST_ENTRY(tcp_rxt_seg) rx_link;
+};
+
+struct tcp_notify_ack_marker {
+       tcp_seq notify_snd_una; /* Notify when snd_una crosses this seq */
+       tcp_notify_ack_id_t notify_id;
+       SLIST_ENTRY(tcp_notify_ack_marker) notify_next;

 };
 
 struct tcptemp {
 };
 
 struct tcptemp {

-       u_char  tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
-       struct  tcphdr tt_t;
+       u_char  tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
+       struct  tcphdr tt_t;

 };
 
 };
 

-#define tcp6cb         tcpcb  /* for KAME src sync over BSD*'s */
+struct bwmeas {
+       tcp_seq bw_start;       /* start of bw measurement */
+       uint32_t bw_ts;         /* timestamp when bw measurement started */
+       uint32_t bw_size;       /* burst size in bytes for this bw measurement */
+       uint32_t bw_minsizepkts; /* Min burst size as segments */
+       uint32_t bw_maxsizepkts; /* Max burst size as segments */
+       uint32_t bw_minsize;    /* Min size in bytes */
+       uint32_t bw_maxsize;    /* Max size in bytes */
+       uint32_t bw_sndbw;      /* Measured send bandwidth */
+       uint32_t bw_sndbw_max;  /* Max measured bandwidth */
+       uint32_t bw_rcvbw_max;  /* Max receive bandwidth measured */
+};
+
+/* MPTCP Data sequence map entry */
+struct mpt_dsn_map {
+       uint64_t                mpt_dsn;        /* data seq num recvd */
+       uint32_t                mpt_sseq;       /* relative subflow # */
+       uint16_t                mpt_len;        /* length of mapping */
+       uint16_t                mpt_csum;       /* checksum value if on */
+       uint8_t                 mpt_dfin;       /* It's a DATA_FIN */
+};
+#define tcp6cb          tcpcb  /* for KAME src sync over BSD*'s */
+
+struct tcp_ccstate {
+       union {
+               struct tcp_cubic_state {
+                       u_int32_t tc_last_max;  /* cwnd at last loss */
+                       u_int32_t tc_epoch_start; /* TS of last loss */
+                       u_int32_t tc_origin_point; /* window at the start of an epoch */
+                       u_int32_t tc_tcp_win; /* computed tcp win */
+                       u_int32_t tc_tcp_bytes_acked; /* bytes acked */
+                       u_int32_t tc_target_win; /* cubic target win */
+                       u_int32_t tc_avg_lastmax; /* Average of last max */
+                       u_int32_t tc_mean_deviation; /* Mean absolute deviation */
+                       float     tc_epoch_period; /* K parameter */
+               } _cubic_state_;
+#define cub_last_max __u__._cubic_state_.tc_last_max
+#define cub_epoch_start __u__._cubic_state_.tc_epoch_start
+#define cub_origin_point __u__._cubic_state_.tc_origin_point
+#define cub_tcp_win __u__._cubic_state_.tc_tcp_win
+#define cub_tcp_bytes_acked __u__._cubic_state_.tc_tcp_bytes_acked
+#define cub_epoch_period __u__._cubic_state_.tc_epoch_period
+#define cub_target_win __u__._cubic_state_.tc_target_win
+#define cub_avg_lastmax __u__._cubic_state_.tc_avg_lastmax
+#define cub_mean_dev __u__._cubic_state_.tc_mean_deviation
+       } __u__;
+};

 
 /*
  * Tcp control block, one per tcp; fields:
  * Organized for 16 byte cacheline efficiency.
  */
 struct tcpcb {
 
 /*
  * Tcp control block, one per tcp; fields:
  * Organized for 16 byte cacheline efficiency.
  */
 struct tcpcb {

-       struct  tsegqe_head t_segq;
-       int     t_dupacks;              /* consecutive dup acks recd */
-       struct  tcptemp *unused;        /* unused now: was t_template */
-
-       int     t_timer[TCPT_NTIMERS];  /* tcp timers */
-
-       struct  inpcb *t_inpcb;         /* back pointer to internet pcb */
-       int     t_state;                /* state of this connection */
-       u_int   t_flags;
-#define        TF_ACKNOW       0x00001         /* ack peer immediately */
-#define        TF_DELACK       0x00002         /* ack, but try to delay it */
-#define        TF_NODELAY      0x00004         /* don't delay packets to coalesce */
-#define        TF_NOOPT        0x00008         /* don't use tcp options */
-#define        TF_SENTFIN      0x00010         /* have sent FIN */
-#define        TF_REQ_SCALE    0x00020         /* have/will request window scaling */
-#define        TF_RCVD_SCALE   0x00040         /* other side has requested scaling */
-#define        TF_REQ_TSTMP    0x00080         /* have/will request timestamps */
-#define        TF_RCVD_TSTMP   0x00100         /* a timestamp was received in SYN */
-#define        TF_SACK_PERMIT  0x00200         /* other side said I could SACK */
-#define        TF_NEEDSYN      0x00400         /* send SYN (implicit state) */
-#define        TF_NEEDFIN      0x00800         /* send FIN (implicit state) */
-#define        TF_NOPUSH       0x01000         /* don't push */
-#define        TF_REQ_CC       0x02000         /* have/will request CC */
-#define        TF_RCVD_CC      0x04000         /* a CC was received in SYN */
-#define        TF_SENDCCNEW    0x08000         /* send CCnew instead of CC in SYN */
-#define        TF_MORETOCOME   0x10000         /* More data to be appended to sock */
-#define        TF_LQ_OVERFLOW  0x20000         /* listen queue overflow */
-#define        TF_RXWIN0SENT   0x40000         /* sent a receiver win 0 in response */
-#define        TF_SLOWLINK     0x80000         /* route is a on a modem speed link */
-
-
-#define        TF_LASTIDLE     0x100000                /* connection was previously idle */
-#define        TF_FASTRECOVERY 0x200000        /* in NewReno Fast Recovery */
-#define        TF_WASFRECOVERY 0x400000        /* was in NewReno Fast Recovery */
-#define        TF_SIGNATURE    0x800000        /* require MD5 digests (RFC2385) */
-#define        TF_MAXSEGSNT    0x1000000       /* last segment sent was a full segment */
-
-       int     t_force;                /* 1 if forcing out a byte */
-
-       tcp_seq snd_una;                /* send unacknowledged */
-       tcp_seq snd_max;                /* highest sequence number sent;
-                                        * used to recognize retransmits
-                                        */
-       tcp_seq snd_nxt;                /* send next */
-       tcp_seq snd_up;                 /* send urgent pointer */
-
-       tcp_seq snd_wl1;                /* window update seg seq number */
-       tcp_seq snd_wl2;                /* window update seg ack number */
-       tcp_seq iss;                    /* initial send sequence number */
-       tcp_seq irs;                    /* initial receive sequence number */
-
-       tcp_seq rcv_nxt;                /* receive next */
-       tcp_seq rcv_adv;                /* advertised window */
-       u_long  rcv_wnd;                /* receive window */
-       tcp_seq rcv_up;                 /* receive urgent pointer */
-
-       u_long  snd_wnd;                /* send window */
-       u_long  snd_cwnd;               /* congestion-controlled window */
-       u_long  snd_ssthresh;           /* snd_cwnd size threshold for
-                                        * for slow start exponential to
-                                        * linear switch
-                                        */
-       u_int   t_maxopd;               /* mss plus options */
-
-       u_long  t_rcvtime;              /* inactivity time */
-       u_long  t_starttime;            /* time connection was established */
-       int     t_rtttime;              /* round trip time */
-       tcp_seq t_rtseq;                /* sequence number being timed */
-
-       int     t_rxtcur;               /* current retransmit value (ticks) */
-       u_int   t_maxseg;               /* maximum segment size */
-       int     t_srtt;                 /* smoothed round-trip time */
-       int     t_rttvar;               /* variance in round-trip time */
-
-       int     t_rxtshift;             /* log(2) of rexmt exp. backoff */
-       u_int   t_rttmin;               /* minimum rtt allowed */
-       u_long  t_rttupdated;           /* number of times rtt sampled */
-       u_long  max_sndwnd;             /* largest window peer has offered */
-
-       int     t_softerror;            /* possible error not yet reported */
+       struct  tsegqe_head t_segq;
+       int     t_dupacks;              /* consecutive dup acks recd */
+       int     t_state;                /* state of this connection */
+       uint32_t t_timer[TCPT_NTIMERS]; /* tcp timers */
+       struct tcptimerentry tentry;    /* entry in timer list */
+
+       struct  inpcb *t_inpcb;         /* back pointer to internet pcb */
+       uint32_t        t_flags;
+#define TF_ACKNOW       0x00001         /* ack peer immediately */
+#define TF_DELACK       0x00002         /* ack, but try to delay it */
+#define TF_NODELAY      0x00004         /* don't delay packets to coalesce */
+#define TF_NOOPT        0x00008         /* don't use tcp options */
+#define TF_SENTFIN      0x00010         /* have sent FIN */
+#define TF_REQ_SCALE    0x00020         /* have/will request window scaling */
+#define TF_RCVD_SCALE   0x00040         /* other side has requested scaling */
+#define TF_REQ_TSTMP    0x00080         /* have/will request timestamps */
+#define TF_RCVD_TSTMP   0x00100         /* a timestamp was received in SYN */
+#define TF_SACK_PERMIT  0x00200         /* other side said I could SACK */
+#define TF_NEEDSYN      0x00400         /* send SYN (implicit state) */
+#define TF_NEEDFIN      0x00800         /* send FIN (implicit state) */
+#define TF_NOPUSH       0x01000         /* don't push */
+#define TF_REQ_CC       0x02000         /* have/will request CC */
+#define TF_RCVD_CC      0x04000         /* a CC was received in SYN */
+#define TF_SENDCCNEW    0x08000         /* Unused */
+#define TF_MORETOCOME   0x10000         /* More data to be appended to sock */
+#define TF_LOCAL        0x20000         /* connection to a host on local link */
+#define TF_RXWIN0SENT   0x40000         /* sent a receiver win 0 in response */
+#define TF_SLOWLINK     0x80000         /* route is a on a modem speed link */
+#define TF_LASTIDLE     0x100000        /* connection was previously idle */
+#define TF_FASTRECOVERY 0x200000        /* in NewReno Fast Recovery */
+#define TF_WASFRECOVERY 0x400000        /* was in NewReno Fast Recovery */
+#define TF_SIGNATURE    0x800000        /* require MD5 digests (RFC2385) */
+#define TF_MAXSEGSNT    0x1000000       /* last segment sent was a full segment */
+#define TF_STREAMING_ON 0x2000000       /* Receiver detected streaming */
+#define TF_PMTUD        0x4000000       /* Perform Path MTU Discovery for this connection */
+#define TF_CLOSING      0x8000000       /* pending tcp close */
+#define TF_TSO          0x10000000      /* TCP Segment Offloading is enable on this connection */
+#define TF_BLACKHOLE    0x20000000      /* Path MTU Discovery Black Hole detection */
+#define TF_TIMER_ONLIST 0x40000000      /* pcb is on tcp_timer_list */
+#define TF_STRETCHACK   0x80000000      /* receiver is going to delay acks */
+
+       tcp_seq snd_una;                /* send unacknowledged */
+       tcp_seq snd_max;                /* highest sequence number sent;
+                                        * used to recognize retransmits
+                                        */
+       tcp_seq snd_nxt;                /* send next */
+       tcp_seq snd_up;                 /* send urgent pointer */
+
+       tcp_seq snd_wl1;                /* window update seg seq number */
+       tcp_seq snd_wl2;                /* window update seg ack number */
+       tcp_seq iss;                    /* initial send sequence number */
+       tcp_seq irs;                    /* initial receive sequence number */
+
+       tcp_seq rcv_nxt;                /* receive next */
+       tcp_seq rcv_adv;                /* advertised window */
+       u_int32_t       rcv_wnd;                /* receive window */
+       tcp_seq rcv_up;                 /* receive urgent pointer */
+
+       u_int32_t       snd_wnd;        /* send window */
+       u_int32_t       snd_cwnd;       /* congestion-controlled window */
+       u_int32_t       snd_ssthresh;   /* snd_cwnd size threshold for
+                                        * for slow start exponential to
+                                        * linear switch
+                                        */
+       tcp_seq snd_recover;            /* for use in NewReno Fast Recovery */
+
+       u_int32_t       t_maxopd;       /* mss plus options */
+       u_int32_t       t_rcvtime;      /* time at which a packet was received */
+       u_int32_t       t_sndtime;      /* time at which we last sent new data */
+       u_int32_t       t_starttime;    /* time connection was established */
+       int     t_rtttime;              /* tcp clock when rtt calculation was started */
+       tcp_seq t_rtseq;                /* sequence number being timed */
+
+       u_int32_t rfbuf_ts;             /* recv buffer autoscaling timestamp */
+       u_int32_t rfbuf_cnt;            /* recv buffer autoscaling byte count */
+
+       int     t_rxtcur;               /* current retransmit value (ticks) */
+       u_int   t_maxseg;               /* maximum segment size */
+       int     t_srtt;                 /* smoothed round-trip time */
+       int     t_rttvar;               /* variance in round-trip time */
+
+       u_int64_t       t_accsleep_ms;  /* accumulated sleep time since last boot */
+       u_int16_t       t_reassqlen;    /* length of reassembly queue */
+       u_int16_t       t_rxtshift;     /* log(2) of rexmt exp. backoff */
+       u_int32_t       t_rttmin;       /* minimum rtt allowed */
+       u_int32_t       t_rttbest;      /* best rtt we've seen */
+       u_int32_t       t_rttcur;       /* most recent value of rtt */
+       u_int32_t       t_rttupdated;   /* number of times rtt sampled */
+       u_int32_t       t_rxt_conndroptime;     /* retxmt conn gets dropped after this time, when set */
+       u_int32_t       t_rxtstart;     /* time at which retransmission started */
+       u_int32_t       max_sndwnd;     /* largest window peer has offered */
+
+       int     t_softerror;            /* possible error not yet reported */

 /* out-of-band data */
 /* out-of-band data */

-       char    t_oobflags;             /* have some */
-       char    t_iobc;                 /* input character */
-#define        TCPOOB_HAVEDATA 0x01
-#define        TCPOOB_HADDATA  0x02
+       char    t_oobflags;             /* have some */
+       char    t_iobc;                 /* input character */
+#define TCPOOB_HAVEDATA 0x01
+#define TCPOOB_HADDATA  0x02

 /* RFC 1323 variables */
 /* RFC 1323 variables */

-       u_char  snd_scale;              /* window scaling for send window */
-       u_char  rcv_scale;              /* window scaling for recv window */
-       u_char  request_r_scale;        /* pending window scaling */
-       u_char  requested_s_scale;
-       u_long  ts_recent;              /* timestamp echo data */
-
-       u_long  ts_recent_age;          /* when last updated */
-       tcp_seq last_ack_sent;
-/* RFC 1644 variables */
-       tcp_cc  cc_send;                /* send connection count */
-       tcp_cc  cc_recv;                /* receive connection count */
-       tcp_seq snd_recover;    /* for use in NewReno Fast Recovery */
-/* experimental */
-       u_long  snd_cwnd_prev;          /* cwnd prior to retransmit */
-       u_long  snd_ssthresh_prev;      /* ssthresh prior to retransmit */
-       u_long  t_badrxtwin;            /* window for retransmit recovery */
-
-       int     t_keepidle;             /* keepalive idle timer (override global if > 0) */
-       int     t_lastchain;            /* amount of packets chained last time around */
-
-/* 3529618 MSS overload prevention */
-       u_long  rcv_reset;
-       u_long  rcv_pps;
-       u_long  rcv_byps;
-       tcp_seq snd_high;               /* for use in NewReno Fast Recovery */
-       tcp_seq snd_high_prev;  /* snd_high prior to retransmit */
-
-       tcp_seq snd_recover_prev;       /* snd_recover prior to retransmit */
-       u_char  snd_limited;            /* segments limited transmitted */
-/* anti DoS counters */
-       u_long  rcv_second;             /* start of interval second */
-/* SACK related state */
-       int     sack_enable;            /* enable SACK for this connection */
-       int     snd_numholes;           /* number of holes seen by sender */
+       u_int8_t        snd_scale;      /* window scaling for send window */
+       u_int8_t        rcv_scale;      /* window scaling for recv window */
+       u_int8_t        request_r_scale; /* pending window scaling */
+       u_int8_t        requested_s_scale;
+       u_int8_t        tcp_cc_index;   /* index of congestion control algorithm */
+       u_int8_t        t_adaptive_rtimo;       /* Read timeout used as a multiple of RTT */
+       u_int8_t        t_adaptive_wtimo;       /* Write timeout used as a multiple of RTT */
+       u_int8_t        t_stretchack_delayed;   /* stretch ack delayed */
+
+/* State for limiting early retransmits when SACK is not enabled */
+       u_int16_t       t_early_rexmt_count; /* count of early rexmts */
+       u_int32_t       t_early_rexmt_win; /* window for limiting early rexmts */
+
+       u_int32_t       ts_recent;      /* timestamp echo data */
+
+       u_int32_t       ts_recent_age;  /* when last updated */
+       tcp_seq last_ack_sent;
+/* RFC 3465 variables */
+       u_int32_t       t_bytes_acked;  /* ABC "bytes_acked" parameter */
+
+       int     t_lastchain;            /* amount of packets chained last time around */
+       u_int16_t       t_unacksegs;    /* received but unacked segments for delaying acks */
+       u_int8_t        t_rexmtthresh;  /* duplicate ack threshold for entering fast recovery */
+       u_int8_t        t_rtimo_probes; /* number of adaptive rtimo probes sent */
+       u_int32_t       t_persist_timeout; /* ZWP persistence limit as set by PERSIST_TIMEOUT */
+       u_int32_t       t_persist_stop;         /* persistence limit deadline if triggered by ZWP */
+       u_int32_t       t_notsent_lowat;        /* Low water for not sent data */
+
+/* Receiver state for stretch-ack algorithm */
+       u_int32_t       rcv_unackwin;   /* to measure win for stretching acks */
+       u_int32_t       rcv_by_unackwin; /* bytes seen during the last ack-stretching win */
+       u_int32_t       rcv_by_unackhalfwin;
+       u_int32_t       rcv_nostrack_ts; /* timestamp when stretch ack was disabled automatically */
+       u_int32_t       rcv_nostrack_pkts; /* pkts received since strech ack was disabled */
+       u_int16_t       rcv_waitforss;  /* wait for packets during slow-start */
+
+/* ECN stats */
+       u_int16_t       ecn_flags;
+#define TE_SETUPSENT            0x0001  /* Indicate we have sent ECN-SETUP SYN or SYN-ACK */
+#define TE_SETUPRECEIVED        0x0002  /* Indicate we have received ECN-SETUP SYN or SYN-ACK */
+#define TE_SENDIPECT            0x0004  /* Indicate we haven't sent or received non-ECN-setup SYN or SYN-ACK */
+#define TE_SENDCWR              0x0008  /* Indicate that the next non-retransmit should have the TCP CWR flag set */
+#define TE_SENDECE              0x0010  /* Indicate that the next packet should have the TCP ECE flag set */
+#define TE_INRECOVERY           0x0020  /* connection entered recovery after receiving ECE */
+#define TE_RECV_ECN_CE          0x0040  /* Received IPTOS_ECN_CE marking atleast once */
+#define TE_RECV_ECN_ECE         0x0080  /* Received ECE marking atleast once */
+#define TE_LOST_SYN             0x0100  /* Lost SYN with ECN setup */
+#define TE_LOST_SYNACK          0x0200  /* Lost SYN-ACK with ECN setup */
+#define TE_ECN_MODE_ENABLE      0x0400  /* Option ECN mode set to enable */
+#define TE_ECN_MODE_DISABLE     0x0800  /* Option ECN mode set to disable */
+#define TE_ENABLE_ECN           0x1000  /* Enable negotiation of ECN */
+#define TE_ECN_ON               (TE_SETUPSENT | TE_SETUPRECEIVED) /* Indicate ECN was successfully negotiated on a connection) */
+#define TE_CEHEURI_SET          0x2000 /* We did our CE-probing at the beginning */
+#define TE_CLIENT_SETUP         0x4000  /* setup from client side */
+#define TE_RCVD_SYN_RST         0x8000  /* Received RST to the first ECN enabled SYN */
+
+       u_int32_t       t_ecn_recv_ce;  /* Received CE from the network */
+       u_int32_t       t_ecn_recv_cwr; /* Packets received with CWR */
+
+/* state for bad retransmit recovery */
+       u_int32_t       snd_cwnd_prev;  /* cwnd prior to retransmit */
+       u_int32_t       snd_ssthresh_prev; /* ssthresh prior to retransmit */
+       tcp_seq snd_recover_prev;       /* snd_recover prior to retransmit */
+       int     t_srtt_prev;            /* srtt prior to retransmit */
+       int     t_rttvar_prev;          /* rttvar prior to retransmit */
+       u_int32_t       t_badrexmt_time; /* bad rexmt detection time */
+
+/* Packet reordering metric */
+       u_int16_t       t_reorderwin; /* Reordering late time offset */

 
 

+/* SACK related state */
+       int16_t snd_numholes;           /* number of holes seen by sender */
+       tcp_seq sack_newdata;           /* New data xmitted in this recovery
+                                        *   episode starts at this seq number */

        TAILQ_HEAD(sackhole_head, sackhole) snd_holes;
        TAILQ_HEAD(sackhole_head, sackhole) snd_holes;

-                                               /* SACK scoreboard (sorted) */
-       tcp_seq snd_fack;               /* last seq number(+1) sack'd by rcv'r*/
-       int     rcv_numsacks;           /* # distinct sack blks present */
+       /* SACK scoreboard (sorted) */
+       tcp_seq snd_fack;               /* last seq number(+1) sack'd by rcv'r*/
+       int     rcv_numsacks;           /* # distinct sack blks present */

        struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
        struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */

-       tcp_seq sack_newdata;           /* New data xmitted in this recovery
-                                          episode starts at this seq number */
-       struct sackhint sackhint;       /* SACK scoreboard hint */
-       int     t_rttlow;               /* smallest observerved RTT */
+       struct sackhint sackhint;       /* SACK scoreboard hint */
+
+       struct mbuf     *t_pktlist_head; /* First packet in transmit chain */
+       struct mbuf     *t_pktlist_tail; /* Last packet in transmit chain */
+       u_int32_t       t_pktlist_sentlen; /* total bytes in transmit chain */
+
+       u_int32_t       t_keepidle;     /* keepalive idle timer (override global if > 0) */
+       u_int32_t       t_keepinit;     /* connection timeout, i.e. idle time
+                                        *  in SYN_SENT or SYN_RECV state */
+       u_int32_t       t_keepintvl;    /* interval between keepalives */
+       u_int32_t       t_keepcnt;      /* number of keepalives before close */
+
+       u_int32_t       tso_max_segment_size;   /* TSO maximum segment unit for NIC */
+       u_int16_t       t_pmtud_lastseg_size;   /* size of the last sent segment */
+       u_int16_t       t_pmtud_saved_maxopd;   /* MSS saved before performing PMTU-D BlackHole detection */
+       u_int32_t       t_pmtud_start_ts;       /* Time of PMTUD blackhole detection */
+
+       struct{
+               u_int32_t       rxduplicatebytes;
+               u_int32_t       rxoutoforderbytes;
+               u_int32_t       txretransmitbytes;
+               u_int8_t        synrxtshift;
+               u_int8_t        rxmitsyns;
+               u_int16_t       unused_pad_to_8;
+               u_int32_t       rxmitpkts;
+       } t_stat;
+       u_int8_t        t_notify_ack_count;
+       u_int8_t        t_ecn_recv_ce_pkt; /* Received packet with CE-bit set (independent from last_ack_sent) */
+       u_int16_t       t_cached_maxopd; /* default for MSS adjustment using link status report */
+
+       uint32_t        bg_ssthresh;            /* Slow start threshold until delay increases */
+       uint32_t        t_flagsext;             /* Another field to accommodate more flags */
+#define TF_RXTFINDROP           0x1                     /* Drop conn after retransmitting FIN 3 times */
+#define TF_RCVUNACK_WAITSS      0x2             /* set when the receiver should not stretch acks */
+#define TF_BWMEAS_INPROGRESS    0x4             /* Indicate BW meas is happening */
+#define TF_MEASURESNDBW         0x8             /* Measure send bw on this connection */
+#define TF_LRO_OFFLOADED        0x10            /* Connection LRO offloaded */
+#define TF_SACK_ENABLE          0x20            /* SACK is enabled */
+#define TF_RECOMPUTE_RTT        0x40            /* recompute RTT after spurious retransmit */
+#define TF_DETECT_READSTALL     0x80            /* Used to detect a stall during read operation */
+#define TF_RECV_THROTTLE        0x100           /* Input throttling active */
+#define TF_NOSTRETCHACK         0x200           /* ack every other packet */
+#define TF_NOTIMEWAIT           0x800           /* Avoid going into time-wait */
+#define TF_SENT_TLPROBE         0x1000          /* Sent data in PTO */
+#define TF_PKTS_REORDERED       0x2000          /* Detected reordering */
+#define TF_DELAY_RECOVERY       0x4000          /* delay fast recovery */
+#define TF_FORCE                0x8000          /* force 1 byte out */
+#define TF_DISABLE_STRETCHACK   0x10000         /* auto-disable stretch ack */
+#define TF_NOBLACKHOLE_DETECTION 0x20000        /* Disable PMTU blackhole detection */
+#define TF_DISABLE_DSACK        0x40000         /* Ignore DSACK due to n/w duplication */
+#define TF_RESCUE_RXT           0x80000         /* SACK rescue retransmit */
+#define TF_CWND_NONVALIDATED    0x100000        /* cwnd non validated */
+#define TF_IF_PROBING           0x200000        /* Trigger interface probe timeout */
+#define TF_FASTOPEN             0x400000        /* TCP Fastopen is enabled */
+#define TF_REASS_INPROG         0x800000        /* Reassembly is in progress */
+#define TF_FASTOPEN_FORCE_ENABLE 0x1000000      /* Force-enable TCP Fastopen */
+#define TF_LOGGED_CONN_SUMMARY  0x2000000       /* Connection summary was logged */
+
+#if TRAFFIC_MGT
+       /* Inter-arrival jitter related state */
+       uint32_t        iaj_rcv_ts;             /* tcp clock when the first packet was received */
+       uint16_t        iaj_size;               /* Size of packet for iaj measurement */
+       uint8_t         iaj_small_pkt;          /* Count of packets smaller than iaj_size */
+       uint8_t         t_pipeack_ind;          /* index for next pipeack sample */
+       uint16_t        iaj_pktcnt;             /* packet count, to avoid throttling initially */
+       uint16_t        acc_iaj;                /* Accumulated iaj */
+       uint32_t        avg_iaj;                /* Mean */
+       uint32_t        std_dev_iaj;            /* Standard deviation */
+#endif /* TRAFFIC_MGT */
+       struct bwmeas   *t_bwmeas;              /* State for bandwidth measurement */
+       uint32_t        t_lropktlen;            /* Bytes in a LRO frame */
+       tcp_seq         t_idleat;               /* rcv_nxt at idle time */
+       TAILQ_ENTRY(tcpcb) t_twentry;           /* link for time wait queue */
+       struct tcp_ccstate      *t_ccstate;     /* congestion control related state */
+/* Tail loss probe related state */
+       tcp_seq         t_tlphighrxt;           /* snd_nxt after PTO */
+       u_int32_t       t_tlpstart;             /* timestamp at PTO */
+/* DSACK data receiver state */
+       tcp_seq         t_dsack_lseq;           /* DSACK left sequence */
+       tcp_seq         t_dsack_rseq;           /* DSACK right sequence */
+/* DSACK data sender state */
+       SLIST_HEAD(tcp_rxt_seghead, tcp_rxt_seg) t_rxt_segments;
+       tcp_seq         t_dsack_lastuna;        /* snd_una when last recovery episode started */
+/* state for congestion window validation (draft-ietf-tcpm-newcwv-07) */
+#define TCP_PIPEACK_SAMPLE_COUNT        3
+       u_int32_t       t_pipeack_sample[TCP_PIPEACK_SAMPLE_COUNT];     /* pipeack, bytes acked within RTT */
+       tcp_seq         t_pipeack_lastuna; /* una when pipeack measurement started */
+       u_int32_t       t_pipeack;
+       u_int32_t       t_lossflightsize;
+
+#if MPTCP
+       u_int32_t       t_mpflags;              /* flags for multipath TCP */
+
+#define TMPF_PREESTABLISHED     0x00000001 /* conn in pre-established state */
+#define TMPF_SND_KEYS           0x00000002 /* indicates that keys should be send */
+#define TMPF_MPTCP_TRUE         0x00000004 /* negotiated MPTCP successfully */
+#define TMPF_MPTCP_RCVD_KEY     0x00000008 /* state for 3-way handshake */
+#define TMPF_SND_MPPRIO         0x00000010 /* send priority of subflow */
+#define TMPF_SND_REM_ADDR       0x00000020 /* initiate address removal */
+#define TMPF_RCVD_DACK          0x00000040 /* received a data-ack */
+#define TMPF_JOINED_FLOW        0x00000080 /* Indicates additional flow */
+#define TMPF_BACKUP_PATH        0x00000100 /* Indicates backup path */
+#define TMPF_MPTCP_ACKNOW       0x00000200 /* Send Data ACK */
+#define TMPF_SEND_DSN           0x00000400 /* Send DSN mapping */
+#define TMPF_SEND_DFIN          0x00000800 /* Send Data FIN */
+#define TMPF_RECV_DFIN          0x00001000 /* Recv Data FIN */
+#define TMPF_SENT_JOIN          0x00002000 /* Sent Join */
+#define TMPF_RECVD_JOIN         0x00004000 /* Received Join */
+#define TMPF_RESET              0x00008000 /* Send RST */
+#define TMPF_TCP_FALLBACK       0x00010000 /* Fallback to TCP */
+#define TMPF_FASTCLOSERCV       0x00020000 /* Received Fastclose option */
+#define TMPF_EMBED_DSN          0x00040000 /* tp has DSN mapping */
+#define TMPF_MPTCP_READY        0x00080000 /* Can send DSS options on data */
+#define TMPF_INFIN_SENT         0x00100000 /* Sent infinite mapping */
+#define TMPF_SND_MPFAIL         0x00200000 /* Received mapping csum failure */
+#define TMPF_SND_JACK           0x00400000 /* Send a Join-ACK */
+#define TMPF_TFO_REQUEST        0x00800000 /* TFO Requested */
+
+#define TMPF_MPTCP_SIGNALS      (TMPF_SND_MPPRIO | TMPF_SND_REM_ADDR | TMPF_SND_MPFAIL | TMPF_SND_KEYS | TMPF_SND_JACK)
+
+       tcp_seq                 t_mpuna;        /* unacknowledged sequence */
+       struct mptcb            *t_mptcb;       /* pointer to MPTCP TCB */
+       struct mptsub           *t_mpsub;       /* pointer to the MPTCP subflow */
+       struct mpt_dsn_map      t_rcv_map;      /* Receive mapping list */
+       u_int8_t                t_local_aid;    /* Addr Id for authentication */
+       u_int8_t                t_rem_aid;      /* Addr ID of another subflow */
+       u_int8_t                t_mprxtshift;   /* join retransmission */
+#endif /* MPTCP */
+
+#define TFO_F_OFFER_COOKIE      0x01 /* We will offer a cookie */
+#define TFO_F_COOKIE_VALID      0x02 /* The received cookie is valid */
+#define TFO_F_COOKIE_REQ        0x04 /* Client requested a new cookie */
+#define TFO_F_COOKIE_SENT       0x08 /* Client did send a cookie in the SYN */
+#define TFO_F_SYN_LOSS          0x10 /* A SYN-loss triggered a fallback to regular TCP on the client-side */
+#define TFO_F_NO_SNDPROBING     0x20 /* This network is guaranteed to support TFO in the upstream direction */
+#define TFO_F_HEURISTIC_DONE    0x40 /* We have already marked this network as bad */
+       u_int8_t                t_tfo_flags;
+#define TFO_S_SYNDATA_RCV       0x01 /* SYN+data has been received */
+#define TFO_S_COOKIEREQ_RECV    0x02 /* TFO-cookie request received */
+#define TFO_S_COOKIE_SENT       0x04 /* TFO-cookie announced in SYN/ACK */
+#define TFO_S_COOKIE_INVALID    0x08 /* Received TFO-cookie is invalid */
+#define TFO_S_COOKIE_REQ        0x10 /* TFO-cookie requested within the SYN */
+#define TFO_S_COOKIE_RCV        0x20 /* TFO-cookie received in SYN/ACK */
+#define TFO_S_SYN_DATA_SENT     0x40 /* SYN+data sent */
+#define TFO_S_SYN_DATA_ACKED    0x80 /* SYN+data has been acknowledged in SYN/ACK */
+#define TFO_S_SYN_LOSS          0x0100 /* SYN+TFO has been lost - fallback to regular TCP */
+#define TFO_S_COOKIE_WRONG      0x0200 /* Cookie we sent in the SYN was wrong */
+#define TFO_S_NO_COOKIE_RCV     0x0400 /* We asked for a cookie but didn't get one */
+#define TFO_S_HEURISTICS_DISABLE 0x0800 /* TFO-heuristics disabled it for this connection */
+#define TFO_S_SEND_BLACKHOLE    0x1000 /* TFO got blackholed in the send direction */
+#define TFO_S_RECV_BLACKHOLE    0x2000 /* TFO got blackholed in the recv direction */
+#define TFO_S_ONE_BYTE_PROXY    0x4000 /* TFO failed because of a proxy acknowledging just one byte */
+       u_int16_t               t_tfo_stats;
+
+       u_int8_t                t_tfo_probes; /* TFO-probes we did send */
+/*
+ * This here is the TFO-probing state-machine. Transitions are as follows:
+ *
+ * Current state: PROBE_NONE
+ *               Event: SYN+DATA acknowledged
+ *                      Action: Transition to PROBE_PROBING and set keepalive-timer
+ *
+ * Current state: PROBE_PROBING (initial state)
+ *               Event: Receive data
+ *                      Action: Transition to PROBE_NONE and cancel keepalive-timer
+ *               Event: Receive ACK that does not indicate a hole
+ *                      Action: Transition to PROBE_NONE and cancel keepalive-timer
+ *               Event: Receive ACK that indicates a hole
+ *                      Action: Transition to PROBE_WAIT_DATA and set a short timer
+ *                              to wait for the final segment.
+ *               Event: Keepalive-timeout (did not receive any segment)
+ *                      Action: Signal ETIMEDOUT as with regular keepalive-timers
+ *
+ * Current state: PROBE_WAIT_DATA
+ *               Event: Receive data
+ *                      Action: Transition to PROBE_NONE and cancel keepalive-timer
+ *               Event: Data-timeout (did not receive the expected data)
+ *                      Action: Signal ENODATA up to the app and close everything.
+ */
+#define TFO_PROBE_NONE          0 /* Not probing now */
+#define TFO_PROBE_PROBING       1 /* Sending out TCP-keepalives waiting for reply */
+#define TFO_PROBE_WAIT_DATA     2 /* Received reply, waiting for data */
+       u_int8_t                t_tfo_probe_state;
+
+       u_int32_t       t_rcvoopack;            /* out-of-order packets received */
+       u_int32_t       t_pawsdrop;             /* segments dropped due to PAWS */
+       u_int32_t       t_sack_recovery_episode; /* SACK recovery episodes */
+       u_int32_t       t_reordered_pkts;       /* packets reorderd */
+       u_int32_t       t_dsack_sent;           /* Sent DSACK notification */
+       u_int32_t       t_dsack_recvd;          /* Received a valid DSACK option */
+       SLIST_HEAD(, tcp_notify_ack_marker) t_notify_ack; /* state for notifying data acknowledgements */
+       u_int32_t       t_recv_throttle_ts;     /* TS for start of recv throttle */
+       u_int32_t       t_rxt_minimum_timeout;  /* minimum retransmit timeout in ms */
+       uint32_t        t_challengeack_last;    /* last time challenge ACK was sent per sec */
+       uint32_t        t_challengeack_count;   /* # of challenge ACKs already sent per sec */
+
+       u_int32_t       t_log_flags;            /* TCP logging flags*/
+       u_int32_t       t_connect_time;         /* time when the connection started */

 };
 
 };
 

-#define IN_FASTRECOVERY(tp)    (tp->t_flags & TF_FASTRECOVERY)
-#define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY
-#define EXIT_FASTRECOVERY(tp)  tp->t_flags &= ~TF_FASTRECOVERY
+#define IN_FASTRECOVERY(tp)     (tp->t_flags & TF_FASTRECOVERY)
+#define SACK_ENABLED(tp)        (tp->t_flagsext & TF_SACK_ENABLE)
+
+/*
+ * If the connection is in a throttled state due to advisory feedback from
+ * the interface output queue, reset that state. We do this in favor
+ * of entering recovery because the data transfer during recovery
+ * should be just a trickle and it will help to improve performance.
+ * We also do not want to back off twice in the same RTT.
+ */
+#define ENTER_FASTRECOVERY(_tp_) do {                           \
+       (_tp_)->t_flags |= TF_FASTRECOVERY;                     \
+       if (INP_IS_FLOW_CONTROLLED((_tp_)->t_inpcb))            \
+               inp_reset_fc_state((_tp_)->t_inpcb);            \
+       if (!SLIST_EMPTY(&tp->t_rxt_segments))                  \
+               tcp_rxtseg_clean(tp);                           \
+} while(0)
+
+#define EXIT_FASTRECOVERY(_tp_) do {            \
+       (_tp_)->t_flags &= ~TF_FASTRECOVERY;    \
+       (_tp_)->t_dupacks = 0;                  \
+       (_tp_)->t_rexmtthresh = tcprexmtthresh; \
+       (_tp_)->t_bytes_acked = 0;              \
+       (_tp_)->ecn_flags &= ~TE_INRECOVERY;    \
+       (_tp_)->t_timer[TCPT_PTO] = 0;          \
+       (_tp_)->t_flagsext &= ~TF_RESCUE_RXT;   \
+       (_tp_)->t_lossflightsize = 0;           \
+} while(0)
+
+/*
+ * When the number of duplicate acks received is less than
+ * the retransmit threshold, use Limited Transmit algorithm
+ */
+extern int tcprexmtthresh;
+#define ALLOW_LIMITED_TRANSMIT(_tp_) \
+       ((_tp_)->t_dupacks > 0 && \
+       (_tp_)->t_dupacks < (_tp_)->t_rexmtthresh && \
+       ((_tp_)->t_flagsext & (TF_PKTS_REORDERED|TF_DELAY_RECOVERY)) \
+           != (TF_PKTS_REORDERED|TF_DELAY_RECOVERY))
+
+/*
+ * This condition is true is timestamp option is supported
+ * on a connection.
+ */
+#define TSTMP_SUPPORTED(_tp_) \
+       (((_tp_)->t_flags & (TF_REQ_TSTMP|TF_RCVD_TSTMP)) == \
+               (TF_REQ_TSTMP|TF_RCVD_TSTMP))
+
+/*
+ * This condition is true if window scale option is supported
+ * on a connection
+ */
+#define TCP_WINDOW_SCALE_ENABLED(_tp_) \
+       (((_tp_)->t_flags & (TF_RCVD_SCALE|TF_REQ_SCALE)) == \
+               (TF_RCVD_SCALE|TF_REQ_SCALE))
+
+/* Is ECN enabled end-to-end */
+#define TCP_ECN_ENABLED(_tp_) \
+       (((_tp_)->ecn_flags & (TE_ECN_ON)) == (TE_ECN_ON))
+
+/*
+ * Gives number of bytes acked by this ack
+ */
+#define BYTES_ACKED(_th_, _tp_) \
+       ((_th_)->th_ack - (_tp_)->snd_una)
+
+/* Returns true if a DSACK option should be sent */
+#define TCP_SEND_DSACK_OPT(_tp_) \
+       ((_tp_)->t_dsack_lseq > 0 && (_tp_)->t_dsack_rseq > 0)
+
+/* Check if DSACK option should be processed */
+#define TCP_DSACK_ENABLED(tp)   (tcp_dsack_enable == 1 && \
+    !(tp->t_flagsext & TF_DISABLE_DSACK))
+
+/*
+ * Returns true if a DSACK sequence is within the max send window that will
+ * be accepted. In order to set a window to validate sequence numbers, the
+ * max send window within which a DSACK option is processed is limited.
+ *
+ * We need to choose a maximum window to check if the sequence number is
+ * within the window. One arbitrary choice is 256 * MSS because if the
+ * window is as large as 256 segments it might be big enough to ignore the
+ * DSACK option. Choosing a much larger limit means that the memory for
+ * retransmit segments can be held for a longer time.
+ */
+#define TCP_DSACK_MAX_SEND_WINDOW(_tp_) ((_tp_)->t_maxseg << 8)
+#define TCP_DSACK_SEQ_IN_WINDOW(_tp_, _seq_, _una_) \
+    (SEQ_LEQ((_seq_), (_tp_)->snd_max) && \
+    SEQ_GEQ((_seq_), ((_una_) - TCP_DSACK_MAX_SEND_WINDOW(_tp_))))
+
+#define TCP_RESET_REXMT_STATE(_tp_) do { \
+       (_tp_)->t_rxtshift = 0; \
+       (_tp_)->t_rxtstart = 0; \
+       mptcp_reset_rexmit_state((_tp_)); \
+} while(0);
+
+#define TCP_AUTORCVBUF_MAX(_ifp_) (((_ifp_) != NULL && (IFNET_IS_CELLULAR((_ifp_))) && ((_ifp_)->if_eflags & IFEF_3CA)) ? \
+               (tcp_autorcvbuf_max << 1) : tcp_autorcvbuf_max)

 
 

+#define TCP_IF_STATE_CHANGED(tp, probe_if_index)                        \
+       (probe_if_index > 0 && tp->t_inpcb->inp_last_outifp != NULL &&  \
+       probe_if_index == tp->t_inpcb->inp_last_outifp->if_index)

 
 /*
  * Structure to hold TCP options that are only used during segment
 
 /*
  * Structure to hold TCP options that are only used during segment


@@ -263,19 +738,23 @@ struct tcpcb {
  * to tcp_dooptions.
  */
 struct tcpopt {
  * to tcp_dooptions.
  */
 struct tcpopt {

-       u_long  to_flags;               /* which options are present */
-#define TOF_TS         0x0001          /* timestamp */
-#define        TOF_MSS         0x0010
-#define        TOF_SCALE       0x0020
-#define        TOF_SIGNATURE   0x0040  /* signature option present */
-#define        TOF_SIGLEN      0x0080  /* signature length valid (RFC2385) */
-#define        TOF_SACK        0x0100          /* Peer sent SACK option */
-       u_long          to_tsval;
-       u_long          to_tsecr;
-       u_int16_t       to_mss;
-       u_int8_t        to_requested_s_scale;
-       u_int8_t        to_nsacks;      /* number of SACK blocks */
-       u_char          *to_sacks;      /* pointer to the first SACK blocks */
+       u_int32_t       to_flags;               /* which options are present */
+#define TOF_TS          0x0001          /* timestamp */
+#define TOF_MSS         0x0010
+#define TOF_SCALE       0x0020
+#define TOF_SIGNATURE   0x0040  /* signature option present */
+#define TOF_SIGLEN      0x0080  /* signature length valid (RFC2385) */
+#define TOF_SACK        0x0100          /* Peer sent SACK option */
+#define TOF_MPTCP       0x0200  /* MPTCP options to be dropped */
+#define TOF_TFO         0x0400  /* TFO cookie option present */
+#define TOF_TFOREQ      0x0800  /* TFO cookie request present */
+       u_int32_t               to_tsval;
+       u_int32_t               to_tsecr;
+       u_int16_t       to_mss;
+       u_int8_t        to_requested_s_scale;
+       u_int8_t        to_nsacks;      /* number of SACK blocks */
+       u_char          *to_sacks;      /* pointer to the first SACK blocks */
+       u_char          *to_tfo;        /* pointer to the TFO cookie */

 };
 
 /*
 };
 
 /*


@@ -283,35 +762,25 @@ struct tcpopt {
  * portion of the route metrics.
  */
 struct rmxp_tao {
  * portion of the route metrics.
  */
 struct rmxp_tao {

-       tcp_cc  tao_cc;                 /* latest CC in valid SYN */
-       tcp_cc  tao_ccsent;             /* latest CC sent to peer */
-       u_short tao_mssopt;             /* peer's cached MSS */
+       tcp_cc  tao_cc;                 /* latest CC in valid SYN */
+       tcp_cc  tao_ccsent;             /* latest CC sent to peer */
+       u_short tao_mssopt;             /* peer's cached MSS */

 #ifdef notyet
 #ifdef notyet

-       u_short tao_flags;              /* cache status flags */
-#define        TAOF_DONT       0x0001          /* peer doesn't understand rfc1644 */
-#define        TAOF_OK         0x0002          /* peer does understand rfc1644 */
-#define        TAOF_UNDEF      0               /* we don't know yet */
+       u_short tao_flags;              /* cache status flags */
+#define TAOF_DONT       0x0001          /* peer doesn't understand rfc1644 */
+#define TAOF_OK         0x0002          /* peer does understand rfc1644 */
+#define TAOF_UNDEF      0               /* we don't know yet */

 #endif /* notyet */
 };
 #endif /* notyet */
 };

-#define rmx_taop(r)    ((struct rmxp_tao *)(r).rmx_filler)
+#define rmx_taop(r)     ((struct rmxp_tao *)(r).rmx_filler)

 
 

-#define        intotcpcb(ip)   ((struct tcpcb *)(ip)->inp_ppcb)
-#define        sototcpcb(so)   (intotcpcb(sotoinpcb(so)))
+#define intotcpcb(ip)   ((struct tcpcb *)(ip)->inp_ppcb)
+#define sototcpcb(so)   (intotcpcb(sotoinpcb(so)))

 
 

-/*
- * The smoothed round-trip time and estimated variance
- * are stored as fixed point numbers scaled by the values below.
- * For convenience, these scales are also used in smoothing the average
- * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
- * With these scales, srtt has 3 bits to the right of the binary point,
- * and thus an "ALPHA" of 0.875.  rttvar has 2 bits to the right of the
- * binary point, and is smoothed with an ALPHA of 0.75.
- */
-#define        TCP_RTT_SCALE           32      /* multiplier for srtt; 3 bits frac. */
-#define        TCP_RTT_SHIFT           5       /* shift for srtt; 3 bits frac. */
-#define        TCP_RTTVAR_SCALE        16      /* multiplier for rttvar; 2 bits */
-#define        TCP_RTTVAR_SHIFT        4       /* shift for rttvar; 2 bits */
-#define        TCP_DELTA_SHIFT         2       /* see tcp_input.c */
+/* TFO-specific defines */
+#define TFO_COOKIE_LEN_MIN      4
+#define TFO_COOKIE_LEN_DEFAULT  8
+#define TFO_COOKIE_LEN_MAX      16

 
 /*
  * The initial retransmission should happen at rtt + 4 * rttvar.
 
 /*
  * The initial retransmission should happen at rtt + 4 * rttvar.


@@ -329,7 +798,7 @@ struct rmxp_tao {
  * which results in inappropriately large RTO values for very
  * fast networks.
  */
  * which results in inappropriately large RTO values for very
  * fast networks.
  */

-#define        TCP_REXMTVAL(tp) \
+#define TCP_REXMTVAL(tp) \

        max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT))  \
          + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
 
        max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT))  \
          + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
 


@@ -340,227 +809,672 @@ struct rmxp_tao {
 struct otcpcb {
 #else
 struct tseg_qent;
 struct otcpcb {
 #else
 struct tseg_qent;

-LIST_HEAD(tsegqe_head, tseg_qent);
+_TCPCB_LIST_HEAD(tsegqe_head, tseg_qent);

 
 struct tcpcb {
 #endif /* KERNEL_PRIVATE */
 
 struct tcpcb {
 #endif /* KERNEL_PRIVATE */

-       struct  tsegqe_head t_segq;
-       int     t_dupacks;              /* consecutive dup acks recd */
-       struct  tcptemp *unused;        /* unused now: was t_template */
-
-       int     t_timer[TCPT_NTIMERS];  /* tcp timers */
-
-       struct  inpcb *t_inpcb;         /* back pointer to internet pcb */
-       int     t_state;                /* state of this connection */
-       u_int   t_flags;
-#define        TF_ACKNOW       0x00001         /* ack peer immediately */
-#define        TF_DELACK       0x00002         /* ack, but try to delay it */
-#define        TF_NODELAY      0x00004         /* don't delay packets to coalesce */
-#define        TF_NOOPT        0x00008         /* don't use tcp options */
-#define        TF_SENTFIN      0x00010         /* have sent FIN */
-#define        TF_REQ_SCALE    0x00020         /* have/will request window scaling */
-#define        TF_RCVD_SCALE   0x00040         /* other side has requested scaling */
-#define        TF_REQ_TSTMP    0x00080         /* have/will request timestamps */
-#define        TF_RCVD_TSTMP   0x00100         /* a timestamp was received in SYN */
-#define        TF_SACK_PERMIT  0x00200         /* other side said I could SACK */
-#define        TF_NEEDSYN      0x00400         /* send SYN (implicit state) */
-#define        TF_NEEDFIN      0x00800         /* send FIN (implicit state) */
-#define        TF_NOPUSH       0x01000         /* don't push */
-#define        TF_REQ_CC       0x02000         /* have/will request CC */
-#define        TF_RCVD_CC      0x04000         /* a CC was received in SYN */
-#define        TF_SENDCCNEW    0x08000         /* send CCnew instead of CC in SYN */
-#define        TF_MORETOCOME   0x10000         /* More data to be appended to sock */
-#define        TF_LQ_OVERFLOW  0x20000         /* listen queue overflow */
-#define        TF_RXWIN0SENT   0x40000         /* sent a receiver win 0 in response */
-#define        TF_SLOWLINK     0x80000         /* route is a on a modem speed link */
-
-       int     t_force;                /* 1 if forcing out a byte */
-
-       tcp_seq snd_una;                /* send unacknowledged */
-       tcp_seq snd_max;                /* highest sequence number sent;
-                                        * used to recognize retransmits
-                                        */
-       tcp_seq snd_nxt;                /* send next */
-       tcp_seq snd_up;                 /* send urgent pointer */
-
-       tcp_seq snd_wl1;                /* window update seg seq number */
-       tcp_seq snd_wl2;                /* window update seg ack number */
-       tcp_seq iss;                    /* initial send sequence number */
-       tcp_seq irs;                    /* initial receive sequence number */
-
-       tcp_seq rcv_nxt;                /* receive next */
-       tcp_seq rcv_adv;                /* advertised window */
-       u_long  rcv_wnd;                /* receive window */
-       tcp_seq rcv_up;                 /* receive urgent pointer */
-
-       u_long  snd_wnd;                /* send window */
-       u_long  snd_cwnd;               /* congestion-controlled window */
-       u_long  snd_ssthresh;           /* snd_cwnd size threshold for
-                                        * for slow start exponential to
-                                        * linear switch
-                                        */
-       u_int   t_maxopd;               /* mss plus options */
-
-       u_long  t_rcvtime;              /* inactivity time */
-       u_long  t_starttime;            /* time connection was established */
-       int     t_rtttime;              /* round trip time */
-       tcp_seq t_rtseq;                /* sequence number being timed */
-
-       int     t_rxtcur;               /* current retransmit value (ticks) */
-       u_int   t_maxseg;               /* maximum segment size */
-       int     t_srtt;                 /* smoothed round-trip time */
-       int     t_rttvar;               /* variance in round-trip time */
-
-       int     t_rxtshift;             /* log(2) of rexmt exp. backoff */
-       u_int   t_rttmin;               /* minimum rtt allowed */
-       u_long  t_rttupdated;           /* number of times rtt sampled */
-       u_long  max_sndwnd;             /* largest window peer has offered */
-
-       int     t_softerror;            /* possible error not yet reported */
+#if defined(KERNEL_PRIVATE)
+       u_int32_t t_segq;
+#else
+       struct  tsegqe_head t_segq;
+#endif /* KERNEL_PRIVATE */
+       int     t_dupacks;              /* consecutive dup acks recd */
+       u_int32_t unused;               /* unused now: was t_template */
+
+       int     t_timer[TCPT_NTIMERS_EXT];      /* tcp timers */
+
+       _TCPCB_PTR(struct inpcb *) t_inpcb;     /* back pointer to internet pcb */
+       int     t_state;                /* state of this connection */
+       u_int   t_flags;
+#define TF_ACKNOW       0x00001         /* ack peer immediately */
+#define TF_DELACK       0x00002         /* ack, but try to delay it */
+#define TF_NODELAY      0x00004         /* don't delay packets to coalesce */
+#define TF_NOOPT        0x00008         /* don't use tcp options */
+#define TF_SENTFIN      0x00010         /* have sent FIN */
+#define TF_REQ_SCALE    0x00020         /* have/will request window scaling */
+#define TF_RCVD_SCALE   0x00040         /* other side has requested scaling */
+#define TF_REQ_TSTMP    0x00080         /* have/will request timestamps */
+#define TF_RCVD_TSTMP   0x00100         /* a timestamp was received in SYN */
+#define TF_SACK_PERMIT  0x00200         /* other side said I could SACK */
+#define TF_NEEDSYN      0x00400         /* send SYN (implicit state) */
+#define TF_NEEDFIN      0x00800         /* send FIN (implicit state) */
+#define TF_NOPUSH       0x01000         /* don't push */
+#define TF_REQ_CC       0x02000         /* have/will request CC */
+#define TF_RCVD_CC      0x04000         /* a CC was received in SYN */
+#define TF_SENDCCNEW    0x08000         /* Not implemented */
+#define TF_MORETOCOME   0x10000         /* More data to be appended to sock */
+#define TF_LQ_OVERFLOW  0x20000         /* listen queue overflow */
+#define TF_RXWIN0SENT   0x40000         /* sent a receiver win 0 in response */
+#define TF_SLOWLINK     0x80000         /* route is a on a modem speed link */
+
+       int     t_force;                /* 1 if forcing out a byte */
+
+       tcp_seq snd_una;                /* send unacknowledged */
+       tcp_seq snd_max;                /* highest sequence number sent;
+                                        * used to recognize retransmits
+                                        */
+       tcp_seq snd_nxt;                /* send next */
+       tcp_seq snd_up;                 /* send urgent pointer */
+
+       tcp_seq snd_wl1;                /* window update seg seq number */
+       tcp_seq snd_wl2;                /* window update seg ack number */
+       tcp_seq iss;                    /* initial send sequence number */
+       tcp_seq irs;                    /* initial receive sequence number */
+
+       tcp_seq rcv_nxt;                /* receive next */
+       tcp_seq rcv_adv;                /* advertised window */
+       u_int32_t rcv_wnd;              /* receive window */
+       tcp_seq rcv_up;                 /* receive urgent pointer */
+
+       u_int32_t snd_wnd;              /* send window */
+       u_int32_t snd_cwnd;             /* congestion-controlled window */
+       u_int32_t snd_ssthresh;         /* snd_cwnd size threshold for
+                                        * for slow start exponential to
+                                        * linear switch
+                                        */
+       u_int   t_maxopd;               /* mss plus options */
+
+       u_int32_t t_rcvtime;            /* time at which a packet was received */
+       u_int32_t t_starttime;          /* time connection was established */
+       int     t_rtttime;              /* round trip time */
+       tcp_seq t_rtseq;                /* sequence number being timed */
+
+       int     t_rxtcur;               /* current retransmit value (ticks) */
+       u_int   t_maxseg;               /* maximum segment size */
+       int     t_srtt;                 /* smoothed round-trip time */
+       int     t_rttvar;               /* variance in round-trip time */
+
+       int     t_rxtshift;             /* log(2) of rexmt exp. backoff */
+       u_int   t_rttmin;               /* minimum rtt allowed */
+       u_int32_t t_rttupdated;         /* number of times rtt sampled */
+       u_int32_t max_sndwnd;           /* largest window peer has offered */
+
+       int     t_softerror;            /* possible error not yet reported */

 /* out-of-band data */
 /* out-of-band data */

-       char    t_oobflags;             /* have some */
-       char    t_iobc;                 /* input character */
-#define        TCPOOB_HAVEDATA 0x01
-#define        TCPOOB_HADDATA  0x02
+       char    t_oobflags;             /* have some */
+       char    t_iobc;                 /* input character */
+#define TCPOOB_HAVEDATA 0x01
+#define TCPOOB_HADDATA  0x02

 /* RFC 1323 variables */
 /* RFC 1323 variables */

-       u_char  snd_scale;              /* window scaling for send window */
-       u_char  rcv_scale;              /* window scaling for recv window */
-       u_char  request_r_scale;        /* pending window scaling */
-       u_char  requested_s_scale;
-       u_long  ts_recent;              /* timestamp echo data */
-
-       u_long  ts_recent_age;          /* when last updated */
-       tcp_seq last_ack_sent;
+       u_char  snd_scale;              /* window scaling for send window */
+       u_char  rcv_scale;              /* window scaling for recv window */
+       u_char  request_r_scale;        /* pending window scaling */
+       u_char  requested_s_scale;
+       u_int32_t ts_recent;            /* timestamp echo data */
+
+       u_int32_t ts_recent_age;        /* when last updated */
+       tcp_seq last_ack_sent;

 /* RFC 1644 variables */
 /* RFC 1644 variables */

-       tcp_cc  cc_send;                /* send connection count */
-       tcp_cc  cc_recv;                /* receive connection count */
-       tcp_seq snd_recover;    /* for use in fast recovery */
+       tcp_cc  cc_send;                /* send connection count */
+       tcp_cc  cc_recv;                /* receive connection count */
+       tcp_seq snd_recover;            /* for use in fast recovery */

 /* experimental */
 /* experimental */

-       u_long  snd_cwnd_prev;          /* cwnd prior to retransmit */
-       u_long  snd_ssthresh_prev;      /* ssthresh prior to retransmit */
-       u_long  t_badrxtwin;            /* window for retransmit recovery */
+       u_int32_t snd_cwnd_prev;        /* cwnd prior to retransmit */
+       u_int32_t snd_ssthresh_prev;    /* ssthresh prior to retransmit */
+       u_int32_t t_badrxtwin;          /* window for retransmit recovery */

 };
 
 };
 

+#define        tcps_ecn_setup  tcps_ecn_client_success
+#define        tcps_sent_cwr   tcps_ecn_recv_ece
+#define        tcps_sent_ece   tcps_ecn_sent_ece
+

 /*
  * TCP statistics.
  * Many of these should be kept per connection,
  * but that's inconvenient at the moment.
  */
 /*
  * TCP statistics.
  * Many of these should be kept per connection,
  * but that's inconvenient at the moment.
  */

-struct tcpstat {
-       u_long  tcps_connattempt;       /* connections initiated */
-       u_long  tcps_accepts;           /* connections accepted */
-       u_long  tcps_connects;          /* connections established */
-       u_long  tcps_drops;             /* connections dropped */
-       u_long  tcps_conndrops;         /* embryonic connections dropped */
-       u_long  tcps_closed;            /* conn. closed (includes drops) */
-       u_long  tcps_segstimed;         /* segs where we tried to get rtt */
-       u_long  tcps_rttupdated;        /* times we succeeded */
-       u_long  tcps_delack;            /* delayed acks sent */
-       u_long  tcps_timeoutdrop;       /* conn. dropped in rxmt timeout */
-       u_long  tcps_rexmttimeo;        /* retransmit timeouts */
-       u_long  tcps_persisttimeo;      /* persist timeouts */
-       u_long  tcps_keeptimeo;         /* keepalive timeouts */
-       u_long  tcps_keepprobe;         /* keepalive probes sent */
-       u_long  tcps_keepdrops;         /* connections dropped in keepalive */
-
-       u_long  tcps_sndtotal;          /* total packets sent */
-       u_long  tcps_sndpack;           /* data packets sent */
-       u_long  tcps_sndbyte;           /* data bytes sent */
-       u_long  tcps_sndrexmitpack;     /* data packets retransmitted */
-       u_long  tcps_sndrexmitbyte;     /* data bytes retransmitted */
-       u_long  tcps_sndacks;           /* ack-only packets sent */
-       u_long  tcps_sndprobe;          /* window probes sent */
-       u_long  tcps_sndurg;            /* packets sent with URG only */
-       u_long  tcps_sndwinup;          /* window update-only packets sent */
-       u_long  tcps_sndctrl;           /* control (SYN|FIN|RST) packets sent */
-
-       u_long  tcps_rcvtotal;          /* total packets received */
-       u_long  tcps_rcvpack;           /* packets received in sequence */
-       u_long  tcps_rcvbyte;           /* bytes received in sequence */
-       u_long  tcps_rcvbadsum;         /* packets received with ccksum errs */
-       u_long  tcps_rcvbadoff;         /* packets received with bad offset */
-       u_long  tcps_rcvmemdrop;        /* packets dropped for lack of memory */
-       u_long  tcps_rcvshort;          /* packets received too short */
-       u_long  tcps_rcvduppack;        /* duplicate-only packets received */
-       u_long  tcps_rcvdupbyte;        /* duplicate-only bytes received */
-       u_long  tcps_rcvpartduppack;    /* packets with some duplicate data */
-       u_long  tcps_rcvpartdupbyte;    /* dup. bytes in part-dup. packets */
-       u_long  tcps_rcvoopack;         /* out-of-order packets received */
-       u_long  tcps_rcvoobyte;         /* out-of-order bytes received */
-       u_long  tcps_rcvpackafterwin;   /* packets with data after window */
-       u_long  tcps_rcvbyteafterwin;   /* bytes rcvd after window */
-       u_long  tcps_rcvafterclose;     /* packets rcvd after "close" */
-       u_long  tcps_rcvwinprobe;       /* rcvd window probe packets */
-       u_long  tcps_rcvdupack;         /* rcvd duplicate acks */
-       u_long  tcps_rcvacktoomuch;     /* rcvd acks for unsent data */
-       u_long  tcps_rcvackpack;        /* rcvd ack packets */
-       u_long  tcps_rcvackbyte;        /* bytes acked by rcvd acks */
-       u_long  tcps_rcvwinupd;         /* rcvd window update packets */
-       u_long  tcps_pawsdrop;          /* segments dropped due to PAWS */
-       u_long  tcps_predack;           /* times hdr predict ok for acks */
-       u_long  tcps_preddat;           /* times hdr predict ok for data pkts */
-       u_long  tcps_pcbcachemiss;
-       u_long  tcps_cachedrtt;         /* times cached RTT in route updated */
-       u_long  tcps_cachedrttvar;      /* times cached rttvar updated */
-       u_long  tcps_cachedssthresh;    /* times cached ssthresh updated */
-       u_long  tcps_usedrtt;           /* times RTT initialized from route */
-       u_long  tcps_usedrttvar;        /* times RTTVAR initialized from rt */
-       u_long  tcps_usedssthresh;      /* times ssthresh initialized from rt*/
-       u_long  tcps_persistdrop;       /* timeout in persist state */
-       u_long  tcps_badsyn;            /* bogus SYN, e.g. premature ACK */
-       u_long  tcps_mturesent;         /* resends due to MTU discovery */
-       u_long  tcps_listendrop;        /* listen queue overflows */
+struct  tcpstat {
+       u_int32_t       tcps_connattempt;       /* connections initiated */
+       u_int32_t       tcps_accepts;           /* connections accepted */
+       u_int32_t       tcps_connects;          /* connections established */
+       u_int32_t       tcps_drops;             /* connections dropped */
+       u_int32_t       tcps_conndrops;         /* embryonic connections dropped */
+       u_int32_t       tcps_closed;            /* conn. closed (includes drops) */
+       u_int32_t       tcps_segstimed;         /* segs where we tried to get rtt */
+       u_int32_t       tcps_rttupdated;        /* times we succeeded */
+       u_int32_t       tcps_delack;            /* delayed acks sent */
+       u_int32_t       tcps_timeoutdrop;       /* conn. dropped in rxmt timeout */
+       u_int32_t       tcps_rexmttimeo;        /* retransmit timeouts */
+       u_int32_t       tcps_persisttimeo;      /* persist timeouts */
+       u_int32_t       tcps_keeptimeo;         /* keepalive timeouts */
+       u_int32_t       tcps_keepprobe;         /* keepalive probes sent */
+       u_int32_t       tcps_keepdrops;         /* connections dropped in keepalive */
+
+       u_int32_t       tcps_sndtotal;          /* total packets sent */
+       u_int32_t       tcps_sndpack;           /* data packets sent */
+       u_int32_t       tcps_sndbyte;           /* data bytes sent */
+       u_int32_t       tcps_sndrexmitpack;     /* data packets retransmitted */
+       u_int32_t       tcps_sndrexmitbyte;     /* data bytes retransmitted */
+       u_int32_t       tcps_sndacks;           /* ack-only packets sent */
+       u_int32_t       tcps_sndprobe;          /* window probes sent */
+       u_int32_t       tcps_sndurg;            /* packets sent with URG only */
+       u_int32_t       tcps_sndwinup;          /* window update-only packets sent */
+       u_int32_t       tcps_sndctrl;           /* control (SYN|FIN|RST) packets sent */
+
+       u_int32_t       tcps_rcvtotal;          /* total packets received */
+       u_int32_t       tcps_rcvpack;           /* packets received in sequence */
+       u_int32_t       tcps_rcvbyte;           /* bytes received in sequence */
+       u_int32_t       tcps_rcvbadsum;         /* packets received with ccksum errs */
+       u_int32_t       tcps_rcvbadoff;         /* packets received with bad offset */
+       u_int32_t       tcps_rcvmemdrop;        /* packets dropped for lack of memory */
+       u_int32_t       tcps_rcvshort;          /* packets received too short */
+       u_int32_t       tcps_rcvduppack;        /* duplicate-only packets received */
+       u_int32_t       tcps_rcvdupbyte;        /* duplicate-only bytes received */
+       u_int32_t       tcps_rcvpartduppack;    /* packets with some duplicate data */
+       u_int32_t       tcps_rcvpartdupbyte;    /* dup. bytes in part-dup. packets */
+       u_int32_t       tcps_rcvoopack;         /* out-of-order packets received */
+       u_int32_t       tcps_rcvoobyte;         /* out-of-order bytes received */
+       u_int32_t       tcps_rcvpackafterwin;   /* packets with data after window */
+       u_int32_t       tcps_rcvbyteafterwin;   /* bytes rcvd after window */
+       u_int32_t       tcps_rcvafterclose;     /* packets rcvd after "close" */
+       u_int32_t       tcps_rcvwinprobe;       /* rcvd window probe packets */
+       u_int32_t       tcps_rcvdupack;         /* rcvd duplicate acks */
+       u_int32_t       tcps_rcvacktoomuch;     /* rcvd acks for unsent data */
+       u_int32_t       tcps_rcvackpack;        /* rcvd ack packets */
+       u_int32_t       tcps_rcvackbyte;        /* bytes acked by rcvd acks */
+       u_int32_t       tcps_rcvwinupd;         /* rcvd window update packets */
+       u_int32_t       tcps_pawsdrop;          /* segments dropped due to PAWS */
+       u_int32_t       tcps_predack;           /* times hdr predict ok for acks */
+       u_int32_t       tcps_preddat;           /* times hdr predict ok for data pkts */
+       u_int32_t       tcps_pcbcachemiss;
+       u_int32_t       tcps_cachedrtt;         /* times cached RTT in route updated */
+       u_int32_t       tcps_cachedrttvar;      /* times cached rttvar updated */
+       u_int32_t       tcps_cachedssthresh;    /* times cached ssthresh updated */
+       u_int32_t       tcps_usedrtt;           /* times RTT initialized from route */
+       u_int32_t       tcps_usedrttvar;        /* times RTTVAR initialized from rt */
+       u_int32_t       tcps_usedssthresh;      /* times ssthresh initialized from rt*/
+       u_int32_t       tcps_persistdrop;       /* timeout in persist state */
+       u_int32_t       tcps_badsyn;            /* bogus SYN, e.g. premature ACK */
+       u_int32_t       tcps_mturesent;         /* resends due to MTU discovery */
+       u_int32_t       tcps_listendrop;        /* listen queue overflows */
+       u_int32_t       tcps_synchallenge;      /* challenge ACK due to bad SYN */
+       u_int32_t       tcps_rstchallenge;      /* challenge ACK due to bad RST */
+
+       /* new stats from FreeBSD 5.4 sync up */
+       u_int32_t       tcps_minmssdrops;       /* average minmss too low drops */
+
+       u_int32_t       tcps_sndrexmitbad;      /* unnecessary packet retransmissions */
+       u_int32_t       tcps_badrst;            /* ignored RSTs in the window */
+
+       u_int32_t       tcps_sc_added;          /* entry added to syncache */
+       u_int32_t       tcps_sc_retransmitted;  /* syncache entry was retransmitted */
+       u_int32_t       tcps_sc_dupsyn;         /* duplicate SYN packet */
+       u_int32_t       tcps_sc_dropped;        /* could not reply to packet */
+       u_int32_t       tcps_sc_completed;      /* successful extraction of entry */
+       u_int32_t       tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */
+       u_int32_t       tcps_sc_cacheoverflow;  /* syncache cache limit hit */
+       u_int32_t       tcps_sc_reset;          /* RST removed entry from syncache */
+       u_int32_t       tcps_sc_stale;          /* timed out or listen socket gone */
+       u_int32_t       tcps_sc_aborted;        /* syncache entry aborted */
+       u_int32_t       tcps_sc_badack;         /* removed due to bad ACK */
+       u_int32_t       tcps_sc_unreach;        /* ICMP unreachable received */
+       u_int32_t       tcps_sc_zonefail;       /* zalloc() failed */
+       u_int32_t       tcps_sc_sendcookie;     /* SYN cookie sent */
+       u_int32_t       tcps_sc_recvcookie;     /* SYN cookie received */
+
+       u_int32_t       tcps_hc_added;          /* entry added to hostcache */
+       u_int32_t       tcps_hc_bucketoverflow; /* hostcache per bucket limit hit */

 
        /* SACK related stats */
 
        /* SACK related stats */

-       u_long  tcps_sack_recovery_episode; /* SACK recovery episodes */
-       u_long  tcps_sack_rexmits;          /* SACK rexmit segments   */
-       u_long  tcps_sack_rexmit_bytes;     /* SACK rexmit bytes      */
-       u_long  tcps_sack_rcv_blocks;       /* SACK blocks (options) received */
-       u_long  tcps_sack_send_blocks;      /* SACK blocks (options) sent     */
-       u_long  tcps_sack_sboverflow;       /* SACK sendblock overflow   */
+       u_int32_t       tcps_sack_recovery_episode; /* SACK recovery episodes */
+       u_int32_t       tcps_sack_rexmits;          /* SACK rexmit segments   */
+       u_int32_t       tcps_sack_rexmit_bytes;     /* SACK rexmit bytes      */
+       u_int32_t       tcps_sack_rcv_blocks;       /* SACK blocks (options) received */
+       u_int32_t       tcps_sack_send_blocks;      /* SACK blocks (options) sent     */
+       u_int32_t       tcps_sack_sboverflow;       /* SACK sendblock overflow   */
+
+       u_int32_t       tcps_bg_rcvtotal;       /* total background packets received */
+       u_int32_t       tcps_rxtfindrop;        /* drop conn after retransmitting FIN */
+       u_int32_t       tcps_fcholdpacket;      /* packets withheld because of flow control */
+
+       /* LRO related stats */
+       u_int32_t       tcps_coalesced_pack;    /* number of coalesced packets */
+       u_int32_t       tcps_flowtbl_full;      /* times flow table was full */
+       u_int32_t       tcps_flowtbl_collision; /* collisions in flow tbl */
+       u_int32_t       tcps_lro_twopack;       /* 2 packets coalesced */
+       u_int32_t       tcps_lro_multpack;      /* 3 or 4 pkts coalesced */
+       u_int32_t       tcps_lro_largepack;     /* 5 or more pkts coalesced */
+
+       u_int32_t       tcps_limited_txt;       /* Limited transmit used */
+       u_int32_t       tcps_early_rexmt;       /* Early retransmit used */
+       u_int32_t       tcps_sack_ackadv;       /* Cumulative ack advanced along with sack */
+
+       /* Checksum related stats */
+       u_int32_t       tcps_rcv_swcsum;        /* tcp swcksum (inbound), packets */
+       u_int32_t       tcps_rcv_swcsum_bytes;  /* tcp swcksum (inbound), bytes */
+       u_int32_t       tcps_rcv6_swcsum;       /* tcp6 swcksum (inbound), packets */
+       u_int32_t       tcps_rcv6_swcsum_bytes; /* tcp6 swcksum (inbound), bytes */
+       u_int32_t       tcps_snd_swcsum;        /* tcp swcksum (outbound), packets */
+       u_int32_t       tcps_snd_swcsum_bytes;  /* tcp swcksum (outbound), bytes */
+       u_int32_t       tcps_snd6_swcsum;       /* tcp6 swcksum (outbound), packets */
+       u_int32_t       tcps_snd6_swcsum_bytes; /* tcp6 swcksum (outbound), bytes */
+       u_int32_t       tcps_msg_unopkts;       /* unordered packet on TCP msg stream */
+       u_int32_t       tcps_msg_unoappendfail; /* failed to append unordered pkt */
+       u_int32_t       tcps_msg_sndwaithipri; /* send is waiting for high priority data */
+
+       /* MPTCP Related stats */
+       u_int32_t       tcps_invalid_mpcap;     /* Invalid MPTCP capable opts */
+       u_int32_t       tcps_invalid_joins;     /* Invalid MPTCP joins */
+       u_int32_t       tcps_mpcap_fallback;    /* TCP fallback in primary */
+       u_int32_t       tcps_join_fallback;     /* No MPTCP in secondary */
+       u_int32_t       tcps_estab_fallback;    /* DSS option dropped */
+       u_int32_t       tcps_invalid_opt;       /* Catchall error stat */
+       u_int32_t       tcps_mp_outofwin;       /* Packet lies outside the
+                                                *  shared recv window */
+       u_int32_t       tcps_mp_reducedwin;     /* Reduced subflow window */
+       u_int32_t       tcps_mp_badcsum;        /* Bad DSS csum */
+       u_int32_t       tcps_mp_oodata;         /* Out of order data */
+       u_int32_t       tcps_mp_switches;       /* number of subflow switch */
+       u_int32_t       tcps_mp_rcvtotal;       /* number of rcvd packets */
+       u_int32_t       tcps_mp_rcvbytes;       /* number of bytes received */
+       u_int32_t       tcps_mp_sndpacks;       /* number of data packs sent */
+       u_int32_t       tcps_mp_sndbytes;       /* number of bytes sent */
+       u_int32_t       tcps_join_rxmts;        /* join ack retransmits */
+       u_int32_t       tcps_tailloss_rto;      /* RTO due to tail loss */
+       u_int32_t       tcps_reordered_pkts;    /* packets reorderd */
+       u_int32_t       tcps_recovered_pkts;    /* recovered after loss */
+       u_int32_t       tcps_pto;               /* probe timeout */
+       u_int32_t       tcps_rto_after_pto;     /* RTO after a probe */
+       u_int32_t       tcps_tlp_recovery;      /* TLP induced fast recovery */
+       u_int32_t       tcps_tlp_recoverlastpkt; /* TLP recoverd last pkt */
+       u_int32_t       tcps_ecn_client_success; /* client-side connection negotiated ECN */
+       u_int32_t       tcps_ecn_recv_ece;      /* ECE received, sent CWR */
+       u_int32_t       tcps_ecn_sent_ece;      /* Sent ECE notification */
+       u_int32_t       tcps_detect_reordering; /* Detect pkt reordering */
+       u_int32_t       tcps_delay_recovery;    /* Delay fast recovery */
+       u_int32_t       tcps_avoid_rxmt;        /* Retransmission was avoided */
+       u_int32_t       tcps_unnecessary_rxmt;  /* Retransmission was not needed */
+       u_int32_t       tcps_nostretchack;      /* disabled stretch ack algorithm on a connection */
+       u_int32_t       tcps_rescue_rxmt;       /* SACK rescue retransmit */
+       u_int32_t       tcps_pto_in_recovery;   /* rescue retransmit in fast recovery */
+       u_int32_t       tcps_pmtudbh_reverted;  /* PMTU Blackhole detection, segment size reverted */
+
+       /* DSACK related statistics */
+       u_int32_t       tcps_dsack_disable;     /* DSACK disabled due to n/w duplication */
+       u_int32_t       tcps_dsack_ackloss;     /* ignore DSACK due to ack loss */
+       u_int32_t       tcps_dsack_badrexmt;    /* DSACK based bad rexmt recovery */
+       u_int32_t       tcps_dsack_sent;        /* Sent DSACK notification */
+       u_int32_t       tcps_dsack_recvd;       /* Received a valid DSACK option */
+       u_int32_t       tcps_dsack_recvd_old;   /* Received an out of window DSACK option */
+
+       /* MPTCP Subflow selection stats */
+       u_int32_t       tcps_mp_sel_symtomsd;   /* By symptomsd */
+       u_int32_t       tcps_mp_sel_rtt;        /* By RTT comparison */
+       u_int32_t       tcps_mp_sel_rto;        /* By RTO comparison */
+       u_int32_t       tcps_mp_sel_peer;       /* By peer's output pattern */
+       u_int32_t       tcps_mp_num_probes;     /* Number of probes sent */
+       u_int32_t       tcps_mp_verdowngrade;   /* MPTCP version downgrade */
+       u_int32_t       tcps_drop_after_sleep;  /* drop after long AP sleep */
+       u_int32_t       tcps_probe_if;          /* probe packets after interface availability */
+       u_int32_t       tcps_probe_if_conflict; /* Can't send probe packets for interface */
+
+       u_int32_t       tcps_ecn_client_setup;  /* Attempted ECN setup from client side */
+       u_int32_t       tcps_ecn_server_setup;  /* Attempted ECN setup from server side */
+       u_int32_t       tcps_ecn_server_success; /* server-side connection negotiated ECN */
+       u_int32_t       tcps_ecn_lost_synack;   /* Lost SYN-ACK with ECN setup */
+       u_int32_t       tcps_ecn_lost_syn;      /* Lost SYN with ECN setup */
+       u_int32_t       tcps_ecn_not_supported; /* Server did not support ECN setup */
+       u_int32_t       tcps_ecn_recv_ce;       /* Received CE from the network */
+       u_int32_t       tcps_ecn_conn_recv_ce;  /* Number of connections received CE atleast once */
+       u_int32_t       tcps_ecn_conn_recv_ece; /* Number of connections received ECE atleast once */
+       u_int32_t       tcps_ecn_conn_plnoce;   /* Number of connections that received no CE and sufferred packet loss */
+       u_int32_t       tcps_ecn_conn_pl_ce;    /* Number of connections that received CE and sufferred packet loss */
+       u_int32_t       tcps_ecn_conn_nopl_ce;  /* Number of connections that received CE and sufferred no packet loss */
+       u_int32_t       tcps_ecn_fallback_synloss; /* Number of times we did fall back due to SYN-Loss */
+       u_int32_t       tcps_ecn_fallback_reorder; /* Number of times we fallback because we detected the PAWS-issue */
+       u_int32_t       tcps_ecn_fallback_ce;   /* Number of times we fallback because we received too many CEs */
+
+       /* TFO-related statistics */
+       u_int32_t       tcps_tfo_syn_data_rcv;  /* Received a SYN+data with valid cookie */
+       u_int32_t       tcps_tfo_cookie_req_rcv;/* Received a TFO cookie-request */
+       u_int32_t       tcps_tfo_cookie_sent;   /* Offered a TFO-cookie to the client */
+       u_int32_t       tcps_tfo_cookie_invalid;/* Received an invalid TFO-cookie */
+       u_int32_t       tcps_tfo_cookie_req;    /* Cookie requested with the SYN */
+       u_int32_t       tcps_tfo_cookie_rcv;    /* Cookie received in a SYN/ACK */
+       u_int32_t       tcps_tfo_syn_data_sent; /* SYN+data+cookie sent */
+       u_int32_t       tcps_tfo_syn_data_acked;/* SYN+data has been acknowledged */
+       u_int32_t       tcps_tfo_syn_loss;      /* SYN+TFO has been lost and we fallback */
+       u_int32_t       tcps_tfo_blackhole;     /* TFO got blackholed by a middlebox. */
+       u_int32_t       tcps_tfo_cookie_wrong;  /* TFO-cookie we sent was wrong */
+       u_int32_t       tcps_tfo_no_cookie_rcv; /* We asked for a cookie but didn't get one */
+       u_int32_t       tcps_tfo_heuristics_disable; /* TFO got disabled due to heuristics */
+       u_int32_t       tcps_tfo_sndblackhole;  /* TFO got blackholed in the sending direction */
+       u_int32_t       tcps_mss_to_default;    /* Change MSS to default using link status report */
+       u_int32_t       tcps_mss_to_medium;     /* Change MSS to medium using link status report */
+       u_int32_t       tcps_mss_to_low;        /* Change MSS to low using link status report */
+       u_int32_t       tcps_ecn_fallback_droprst; /* ECN fallback caused by connection drop due to RST */
+       u_int32_t       tcps_ecn_fallback_droprxmt; /* ECN fallback due to drop after multiple retransmits */
+       u_int32_t       tcps_ecn_fallback_synrst; /* ECN fallback due to rst after syn */
+
+       u_int32_t       tcps_mptcp_rcvmemdrop;  /* MPTCP packets dropped for lack of memory */
+       u_int32_t       tcps_mptcp_rcvduppack;  /* MPTCP duplicate-only packets received */
+       u_int32_t       tcps_mptcp_rcvpackafterwin; /* MPTCP packets with data after window */
+
+       /* TCP timer statistics */
+       u_int32_t       tcps_timer_drift_le_1_ms;       /* Timer drift less or equal to 1 ms */
+       u_int32_t       tcps_timer_drift_le_10_ms;      /* Timer drift less or equal to 10 ms */
+       u_int32_t       tcps_timer_drift_le_20_ms;      /* Timer drift less or equal to 20 ms */
+       u_int32_t       tcps_timer_drift_le_50_ms;      /* Timer drift less or equal to 50 ms */
+       u_int32_t       tcps_timer_drift_le_100_ms;     /* Timer drift less or equal to 100 ms */
+       u_int32_t       tcps_timer_drift_le_200_ms;     /* Timer drift less or equal to 200 ms */
+       u_int32_t       tcps_timer_drift_le_500_ms;     /* Timer drift less or equal to 500 ms */
+       u_int32_t       tcps_timer_drift_le_1000_ms;    /* Timer drift less or equal to 1000 ms */
+       u_int32_t       tcps_timer_drift_gt_1000_ms;    /* Timer drift greater than 1000 ms */
+
+       u_int32_t       tcps_mptcp_handover_attempt;    /* Total number of MPTCP-attempts using handover mode */
+       u_int32_t       tcps_mptcp_interactive_attempt; /* Total number of MPTCP-attempts using interactive mode */
+       u_int32_t       tcps_mptcp_aggregate_attempt;   /* Total number of MPTCP-attempts using aggregate mode */
+       u_int32_t       tcps_mptcp_fp_handover_attempt; /* Same as previous three but only for first-party apps */
+       u_int32_t       tcps_mptcp_fp_interactive_attempt;
+       u_int32_t       tcps_mptcp_fp_aggregate_attempt;
+       u_int32_t       tcps_mptcp_heuristic_fallback;  /* Total number of MPTCP-connections that fell back due to heuristics */
+       u_int32_t       tcps_mptcp_fp_heuristic_fallback;       /* Same as previous but for first-party apps */
+       u_int32_t       tcps_mptcp_handover_success_wifi;       /* Total number of successfull handover-mode connections that *started* on WiFi */
+       u_int32_t       tcps_mptcp_handover_success_cell;       /* Total number of successfull handover-mode connections that *started* on Cell */
+       u_int32_t       tcps_mptcp_interactive_success;         /* Total number of interactive-mode connections that negotiated MPTCP */
+       u_int32_t       tcps_mptcp_aggregate_success;           /* Same as previous but for aggregate */
+       u_int32_t       tcps_mptcp_fp_handover_success_wifi;    /* Same as previous four, but for first-party apps */
+       u_int32_t       tcps_mptcp_fp_handover_success_cell;
+       u_int32_t       tcps_mptcp_fp_interactive_success;
+       u_int32_t       tcps_mptcp_fp_aggregate_success;
+       u_int32_t       tcps_mptcp_handover_cell_from_wifi;     /* Total number of connections that use cell in handover-mode (coming from WiFi) */
+       u_int32_t       tcps_mptcp_handover_wifi_from_cell;     /* Total number of connections that use WiFi in handover-mode (coming from cell) */
+       u_int32_t       tcps_mptcp_interactive_cell_from_wifi;  /* Total number of connections that use cell in interactive mode (coming from WiFi) */
+       u_int64_t       tcps_mptcp_handover_cell_bytes;         /* Total number of bytes sent on cell in handover-mode (on new subflows, ignoring initial one) */
+       u_int64_t       tcps_mptcp_interactive_cell_bytes;      /* Same as previous but for interactive */
+       u_int64_t       tcps_mptcp_aggregate_cell_bytes;
+       u_int64_t       tcps_mptcp_handover_all_bytes;          /* Total number of bytes sent in handover */
+       u_int64_t       tcps_mptcp_interactive_all_bytes;
+       u_int64_t       tcps_mptcp_aggregate_all_bytes;
+       u_int32_t       tcps_mptcp_back_to_wifi;        /* Total number of connections that succeed to move traffic away from cell (when starting on cell) */
+       u_int32_t       tcps_mptcp_wifi_proxy;          /* Total number of new subflows that fell back to regular TCP on cell */
+       u_int32_t       tcps_mptcp_cell_proxy;          /* Total number of new subflows that fell back to regular TCP on WiFi */
+
+       /* TCP offload statistics */
+       u_int32_t       tcps_ka_offload_drops;  /* Keep alive drops for timeout reported by firmware */
+
+       u_int32_t       tcps_mptcp_triggered_cell;      /* Total number of times an MPTCP-connection triggered cell bringup */
+};
+

 
 

+struct tcpstat_local {
+       u_int64_t badformat;
+       u_int64_t unspecv6;
+       u_int64_t synfin;
+       u_int64_t badformatipsec;
+       u_int64_t noconnnolist;
+       u_int64_t noconnlist;
+       u_int64_t listbadsyn;
+       u_int64_t icmp6unreach;
+       u_int64_t deprecate6;
+       u_int64_t ooopacket;
+       u_int64_t rstinsynrcv;
+       u_int64_t dospacket;
+       u_int64_t cleanup;
+       u_int64_t synwindow;

 };
 
 };
 

+#pragma pack(4)
+

 /*
  * TCB structure exported to user-land via sysctl(3).
  * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
  * included.  Not all of our clients do.
  */
 /*
  * TCB structure exported to user-land via sysctl(3).
  * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
  * included.  Not all of our clients do.
  */

-struct xtcpcb {
-       size_t  xt_len;
+
+struct  xtcpcb {
+       u_int32_t       xt_len;

 #ifdef KERNEL_PRIVATE
 #ifdef KERNEL_PRIVATE

-       struct  inpcb_compat    xt_inp;
+       struct  inpcb_compat    xt_inp;

 #else
 #else

-       struct  inpcb   xt_inp;
+       struct  inpcb   xt_inp;

 #endif
 #ifdef KERNEL_PRIVATE
 #endif
 #ifdef KERNEL_PRIVATE

-       struct  otcpcb  xt_tp;
+       struct  otcpcb  xt_tp;

 #else
        struct  tcpcb   xt_tp;
 #endif
 #else
        struct  tcpcb   xt_tp;
 #endif

-       struct  xsocket xt_socket;
-       u_quad_t        xt_alignment_hack;
+       struct  xsocket xt_socket;
+       u_quad_t        xt_alignment_hack;
+};
+
+#if !CONFIG_EMBEDDED
+
+struct  xtcpcb64 {
+       u_int32_t               xt_len;
+       struct xinpcb64         xt_inpcb;
+
+       u_int64_t t_segq;
+       int     t_dupacks;              /* consecutive dup acks recd */
+
+       int t_timer[TCPT_NTIMERS_EXT];  /* tcp timers */
+
+       int     t_state;                /* state of this connection */
+       u_int   t_flags;
+
+       int     t_force;                /* 1 if forcing out a byte */
+
+       tcp_seq snd_una;                /* send unacknowledged */
+       tcp_seq snd_max;                /* highest sequence number sent;
+                                        * used to recognize retransmits
+                                        */
+       tcp_seq snd_nxt;                /* send next */
+       tcp_seq snd_up;                 /* send urgent pointer */
+
+       tcp_seq snd_wl1;                /* window update seg seq number */
+       tcp_seq snd_wl2;                /* window update seg ack number */
+       tcp_seq iss;                    /* initial send sequence number */
+       tcp_seq irs;                    /* initial receive sequence number */
+
+       tcp_seq rcv_nxt;                /* receive next */
+       tcp_seq rcv_adv;                /* advertised window */
+       u_int32_t rcv_wnd;              /* receive window */
+       tcp_seq rcv_up;                 /* receive urgent pointer */
+
+       u_int32_t snd_wnd;              /* send window */
+       u_int32_t snd_cwnd;             /* congestion-controlled window */
+       u_int32_t snd_ssthresh;         /* snd_cwnd size threshold for
+                                        * for slow start exponential to
+                                        * linear switch
+                                        */
+       u_int   t_maxopd;               /* mss plus options */
+
+       u_int32_t t_rcvtime;            /* time at which a packet was received */
+       u_int32_t t_starttime;          /* time connection was established */
+       int     t_rtttime;              /* round trip time */
+       tcp_seq t_rtseq;                /* sequence number being timed */
+
+       int     t_rxtcur;               /* current retransmit value (ticks) */
+       u_int   t_maxseg;               /* maximum segment size */
+       int     t_srtt;                 /* smoothed round-trip time */
+       int     t_rttvar;               /* variance in round-trip time */
+
+       int     t_rxtshift;             /* log(2) of rexmt exp. backoff */
+       u_int   t_rttmin;               /* minimum rtt allowed */
+       u_int32_t t_rttupdated;         /* number of times rtt sampled */
+       u_int32_t max_sndwnd;           /* largest window peer has offered */
+
+       int     t_softerror;            /* possible error not yet reported */
+/* out-of-band data */
+       char    t_oobflags;             /* have some */
+       char    t_iobc;                 /* input character */
+/* RFC 1323 variables */
+       u_char  snd_scale;              /* window scaling for send window */
+       u_char  rcv_scale;              /* window scaling for recv window */
+       u_char  request_r_scale;        /* pending window scaling */
+       u_char  requested_s_scale;
+       u_int32_t ts_recent;            /* timestamp echo data */
+
+       u_int32_t ts_recent_age;        /* when last updated */
+       tcp_seq last_ack_sent;
+/* RFC 1644 variables */
+       tcp_cc  cc_send;                /* send connection count */
+       tcp_cc  cc_recv;                /* receive connection count */
+       tcp_seq snd_recover;            /* for use in fast recovery */
+/* experimental */
+       u_int32_t snd_cwnd_prev;        /* cwnd prior to retransmit */
+       u_int32_t snd_ssthresh_prev;    /* ssthresh prior to retransmit */
+       u_int32_t t_badrxtwin;          /* window for retransmit recovery */
+
+       u_quad_t                xt_alignment_hack;
+};
+
+#endif /* !CONFIG_EMBEDDED */
+
+#ifdef PRIVATE
+
+struct  xtcpcb_n {
+       u_int32_t               xt_len;
+       u_int32_t                       xt_kind;                /* XSO_TCPCB */
+
+       u_int64_t t_segq;
+       int     t_dupacks;              /* consecutive dup acks recd */
+
+       int t_timer[TCPT_NTIMERS_EXT];  /* tcp timers */
+
+       int     t_state;                /* state of this connection */
+       u_int   t_flags;
+
+       int     t_force;                /* 1 if forcing out a byte */
+
+       tcp_seq snd_una;                /* send unacknowledged */
+       tcp_seq snd_max;                /* highest sequence number sent;
+                                        * used to recognize retransmits
+                                        */
+       tcp_seq snd_nxt;                /* send next */
+       tcp_seq snd_up;                 /* send urgent pointer */
+
+       tcp_seq snd_wl1;                /* window update seg seq number */
+       tcp_seq snd_wl2;                /* window update seg ack number */
+       tcp_seq iss;                    /* initial send sequence number */
+       tcp_seq irs;                    /* initial receive sequence number */
+
+       tcp_seq rcv_nxt;                /* receive next */
+       tcp_seq rcv_adv;                /* advertised window */
+       u_int32_t rcv_wnd;              /* receive window */
+       tcp_seq rcv_up;                 /* receive urgent pointer */
+
+       u_int32_t snd_wnd;              /* send window */
+       u_int32_t snd_cwnd;             /* congestion-controlled window */
+       u_int32_t snd_ssthresh;         /* snd_cwnd size threshold for
+                                        * for slow start exponential to
+                                        * linear switch
+                                        */
+       u_int   t_maxopd;               /* mss plus options */
+
+       u_int32_t t_rcvtime;            /* time at which a packet was received */
+       u_int32_t t_starttime;          /* time connection was established */
+       int     t_rtttime;              /* round trip time */
+       tcp_seq t_rtseq;                /* sequence number being timed */
+
+       int     t_rxtcur;               /* current retransmit value (ticks) */
+       u_int   t_maxseg;               /* maximum segment size */
+       int     t_srtt;                 /* smoothed round-trip time */
+       int     t_rttvar;               /* variance in round-trip time */
+
+       int     t_rxtshift;             /* log(2) of rexmt exp. backoff */
+       u_int   t_rttmin;               /* minimum rtt allowed */
+       u_int32_t t_rttupdated;         /* number of times rtt sampled */
+       u_int32_t max_sndwnd;           /* largest window peer has offered */
+
+       int     t_softerror;            /* possible error not yet reported */
+       /* out-of-band data */
+       char    t_oobflags;             /* have some */
+       char    t_iobc;                 /* input character */
+       /* RFC 1323 variables */
+       u_char  snd_scale;              /* window scaling for send window */
+       u_char  rcv_scale;              /* window scaling for recv window */
+       u_char  request_r_scale;        /* pending window scaling */
+       u_char  requested_s_scale;
+       u_int32_t ts_recent;            /* timestamp echo data */
+
+       u_int32_t ts_recent_age;        /* when last updated */
+       tcp_seq last_ack_sent;
+       /* RFC 1644 variables */
+       tcp_cc  cc_send;                /* send connection count */
+       tcp_cc  cc_recv;                /* receive connection count */
+       tcp_seq snd_recover;            /* for use in fast recovery */
+       /* experimental */
+       u_int32_t snd_cwnd_prev;        /* cwnd prior to retransmit */
+       u_int32_t snd_ssthresh_prev;    /* ssthresh prior to retransmit */

 };
 
 };
 

+/*
+ * The rtt measured is in milliseconds as the timestamp granularity is
+ * a millisecond. The smoothed round-trip time and estimated variance
+ * are stored as fixed point numbers scaled by the values below.
+ * For convenience, these scales are also used in smoothing the average
+ * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
+ * With these scales, srtt has 5 bits to the right of the binary point,
+ * and thus an "ALPHA" of 0.875.  rttvar has 4 bits to the right of the
+ * binary point, and is smoothed with an ALPHA of 0.75.
+ */
+#define TCP_RTT_SCALE           32      /* multiplier for srtt; 3 bits frac. */
+#define TCP_RTT_SHIFT           5       /* shift for srtt; 5 bits frac. */
+#define TCP_RTTVAR_SCALE        16      /* multiplier for rttvar; 4 bits */
+#define TCP_RTTVAR_SHIFT        4       /* shift for rttvar; 4 bits */
+#define TCP_DELTA_SHIFT         2       /* see tcp_input.c */
+
+
+/*
+ * TCP structure with information that gives insight into forward progress on an interface,
+ * exported to user-land via sysctl(3).
+ */
+struct  xtcpprogress_indicators {
+       u_int32_t       xp_numflows;            /* Total number of flows */
+       u_int32_t       xp_conn_probe_fails;    /* Count of connection failures */
+       u_int32_t       xp_read_probe_fails;    /* Count of read probe failures */
+       u_int32_t       xp_write_probe_fails;   /* Count of write failures */
+       u_int32_t       xp_recentflows;         /* Total of "recent" flows */
+       u_int32_t       xp_recentflows_unacked; /* Total of "recent" flows with unacknowledged data */
+       u_int64_t       xp_recentflows_rxbytes; /* Total of "recent" flows received bytes */
+       u_int64_t       xp_recentflows_txbytes; /* Total of "recent" flows transmitted bytes */
+       u_int64_t       xp_recentflows_rxooo;   /* Total of "recent" flows received out of order bytes */
+       u_int64_t       xp_recentflows_rxdup;   /* Total of "recent" flows received duplicate bytes */
+       u_int64_t       xp_recentflows_retx;    /* Total of "recent" flows retransmitted bytes */
+       u_int64_t       xp_reserved1;           /* Expansion */
+       u_int64_t       xp_reserved2;           /* Expansion */
+       u_int64_t       xp_reserved3;           /* Expansion */
+       u_int64_t       xp_reserved4;           /* Expansion */
+};
+
+struct tcpprogressreq {
+       u_int64_t       ifindex;                /* Interface index for progress indicators */
+       u_int64_t       recentflow_maxduration; /* In mach_absolute_time, max duration for flow to be counted as "recent" */
+       u_int64_t       filter_flags;           /* Optional additional filtering, values are interface properties per ntstat.h */
+       u_int64_t       xp_reserved2;           /* Expansion */
+};
+
+#endif /* PRIVATE */
+
+#pragma pack()
+

 /*
  * Names for TCP sysctl objects
  */
 /*
  * Names for TCP sysctl objects
  */

-#define        TCPCTL_DO_RFC1323       1       /* use RFC-1323 extensions */
-#define        TCPCTL_DO_RFC1644       2       /* use RFC-1644 extensions */
-#define        TCPCTL_MSSDFLT          3       /* MSS default */
-#define TCPCTL_STATS           4       /* statistics (read-only) */
-#define        TCPCTL_RTTDFLT          5       /* default RTT estimate */
-#define        TCPCTL_KEEPIDLE         6       /* keepalive idle timer */
-#define        TCPCTL_KEEPINTVL        7       /* interval to send keepalives */
-#define        TCPCTL_SENDSPACE        8       /* send buffer space */
-#define        TCPCTL_RECVSPACE        9       /* receive buffer space */
-#define        TCPCTL_KEEPINIT         10      /* timeout for establishing syn */
-#define        TCPCTL_PCBLIST          11      /* list of all outstanding PCBs */
-#define        TCPCTL_DELACKTIME       12      /* time before sending delayed ACK */
-#define        TCPCTL_V6MSSDFLT        13      /* MSS default for IPv6 */
-#define        TCPCTL_MAXID            14
+#define TCPCTL_DO_RFC1323       1       /* use RFC-1323 extensions */
+#define TCPCTL_DO_RFC1644       2       /* use RFC-1644 extensions */
+#define TCPCTL_MSSDFLT          3       /* MSS default */
+#define TCPCTL_STATS            4       /* statistics (read-only) */
+#define TCPCTL_RTTDFLT          5       /* default RTT estimate */
+#define TCPCTL_KEEPIDLE         6       /* keepalive idle timer */
+#define TCPCTL_KEEPINTVL        7       /* interval to send keepalives */
+#define TCPCTL_SENDSPACE        8       /* send buffer space */
+#define TCPCTL_RECVSPACE        9       /* receive buffer space */
+#define TCPCTL_KEEPINIT         10      /* timeout for establishing syn */
+#define TCPCTL_PCBLIST          11      /* list of all outstanding PCBs */
+#define TCPCTL_DELACKTIME       12      /* time before sending delayed ACK */
+#define TCPCTL_V6MSSDFLT        13      /* MSS default for IPv6 */
+#define TCPCTL_MAXID            14
+
+#ifdef BSD_KERNEL_PRIVATE
+#include <sys/bitstring.h>
+
+#define TCP_PKTLIST_CLEAR(tp) {                                         \
+       (tp)->t_pktlist_head = (tp)->t_pktlist_tail = NULL;             \
+       (tp)->t_lastchain = (tp)->t_pktlist_sentlen = 0;                \
+}

 
 

-#ifdef KERNEL_PRIVATE

 #define TCPCTL_NAMES { \
        { 0, 0 }, \
        { "rfc1323", CTLTYPE_INT }, \
 #define TCPCTL_NAMES { \
        { 0, 0 }, \
        { "rfc1323", CTLTYPE_INT }, \


@@ -578,82 +1492,203 @@ struct  xtcpcb {
        { "v6mssdflt", CTLTYPE_INT }, \
 }
 
        { "v6mssdflt", CTLTYPE_INT }, \
 }
 

+extern int tcp_TCPTV_MIN;
+

 #ifdef SYSCTL_DECL
 SYSCTL_DECL(_net_inet_tcp);
 #endif /* SYSCTL_DECL */
 
 #ifdef SYSCTL_DECL
 SYSCTL_DECL(_net_inet_tcp);
 #endif /* SYSCTL_DECL */
 

-extern struct inpcbhead tcb;           /* head of queue of active tcpcb's */
-extern struct inpcbinfo tcbinfo;
-extern struct tcpstat tcpstat; /* tcp statistics */
-extern int tcp_mssdflt;        /* XXX */
-extern int tcp_minmss;
-extern int tcp_minmssoverload;
-extern int tcp_do_newreno;
-extern int ss_fltsz;
-extern int ss_fltsz_local;
-#ifdef __APPLE__
-extern u_long tcp_now;         /* for RFC 1323 timestamps */ 
-extern int tcp_delack_enabled;
-#endif /* __APPLE__ */
-
-extern int tcp_do_sack;        /* SACK enabled/disabled */
-
-void    tcp_canceltimers(struct tcpcb *);
+extern  struct inpcbhead tcb;           /* head of queue of active tcpcb's */
+extern  struct inpcbinfo tcbinfo;
+extern  struct tcpstat tcpstat; /* tcp statistics */
+extern  int tcp_mssdflt;        /* XXX */
+extern  int tcp_minmss;
+#define TCP_FASTOPEN_SERVER 0x01
+#define TCP_FASTOPEN_CLIENT 0x02
+
+extern int tcp_tfo_halfcnt;
+extern int tcp_tfo_backlog;
+extern int tcp_fastopen;
+extern int ss_fltsz;
+extern int ss_fltsz_local;
+extern int tcp_do_rfc3390;              /* Calculate ss_fltsz according to RFC 3390 */
+extern int tcp_do_rfc1323;
+extern int target_qdelay;
+extern u_int32_t tcp_now;               /* for RFC 1323 timestamps */
+extern struct timeval tcp_uptime;
+extern lck_spin_t *tcp_uptime_lock;
+extern int tcp_delack_enabled;
+extern int tcp_do_sack; /* SACK enabled/disabled */
+extern int tcp_do_rfc3465;
+extern int tcp_do_rfc3465_lim2;
+extern int maxseg_unacked;
+extern int tcp_use_newreno;
+extern struct zone *tcp_reass_zone;
+extern struct zone *tcp_rxt_seg_zone;
+extern int tcp_ecn_outbound;
+extern int tcp_ecn_inbound;
+extern u_int32_t tcp_do_autorcvbuf;
+extern u_int32_t tcp_autorcvbuf_max;
+extern u_int32_t tcp_autorcvbuf_inc_shift;
+extern int tcp_recv_bg;
+
+struct protosw;
+struct domain;
+
+struct tcp_respond_args {
+       unsigned int ifscope;
+       unsigned int nocell:1,
+           noexpensive:1,
+           awdl_unrestricted:1,
+           intcoproc_allowed:1,
+           keep_alive:1,
+           noconstrained:1;
+};
+
+void     tcp_canceltimers(struct tcpcb *);

 struct tcpcb *
 struct tcpcb *

-        tcp_close(struct tcpcb *);
-void    tcp_ctlinput(int, struct sockaddr *, void *);
-int     tcp_ctloutput(struct socket *, struct sockopt *);
+tcp_close(struct tcpcb *);
+void     tcp_ctlinput(int, struct sockaddr *, void *, struct ifnet *);
+int      tcp_ctloutput(struct socket *, struct sockopt *);

 struct tcpcb *
 struct tcpcb *

-        tcp_drop(struct tcpcb *, int);
-void    tcp_drain(void);
-void    tcp_fasttimo(void);
+tcp_drop(struct tcpcb *, int);
+void     tcp_drain(void);
+void     tcp_getrt_rtt(struct tcpcb *tp, struct rtentry *rt);

 struct rmxp_tao *
 struct rmxp_tao *

-        tcp_gettaocache(struct inpcb *);
-void    tcp_init(void);
-void    tcp_input(struct mbuf *, int);
-void    tcp_mss(struct tcpcb *, int);
-int     tcp_mssopt(struct tcpcb *);
-void    tcp_drop_syn_sent(struct inpcb *, int);
-void    tcp_mtudisc(struct inpcb *, int);
+tcp_gettaocache(struct inpcb *);
+void     tcp_init(struct protosw *, struct domain *);
+void     tcp_input(struct mbuf *, int);
+void     tcp_mss(struct tcpcb *, int, unsigned int);
+int      tcp_mssopt(struct tcpcb *);
+void     tcp_drop_syn_sent(struct inpcb *, int);
+void     tcp_mtudisc(struct inpcb *, int);

 struct tcpcb *
 struct tcpcb *

-        tcp_newtcpcb(struct inpcb *);
-int     tcp_output(struct tcpcb *);
-void    tcp_quench(struct inpcb *, int);
-void    tcp_respond(struct tcpcb *, void *,
-           struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
+tcp_newtcpcb(struct inpcb *);
+int      tcp_output(struct tcpcb *);
+void     tcp_respond(struct tcpcb *, void *, struct tcphdr *, struct mbuf *,
+    tcp_seq, tcp_seq, int, struct tcp_respond_args *);

 struct rtentry *
 struct rtentry *

-        tcp_rtlookup(struct inpcb *);
-void    tcp_setpersist(struct tcpcb *);
-void    tcp_slowtimo(void);
-struct tcptemp *
-        tcp_maketemplate(struct tcpcb *);
-void    tcp_fillheaders(struct tcpcb *, void *, void *);
-struct tcpcb *
-        tcp_timers(struct tcpcb *, int);
-void    tcp_trace(int, int, struct tcpcb *, void *, struct tcphdr *, int);
-
-void    tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
-void    tcp_clean_sackreport(struct tcpcb *tp);
-void    tcp_sack_adjust(struct tcpcb *tp);
+tcp_rtlookup(struct inpcb *, unsigned int);
+void     tcp_setpersist(struct tcpcb *);
+void     tcp_gc(struct inpcbinfo *);
+void     tcp_itimer(struct inpcbinfo *ipi);
+void     tcp_check_timer_state(struct tcpcb *tp);
+void     tcp_run_timerlist(void *arg1, void *arg2);
+void     tcp_sched_timers(struct tcpcb *tp);
+
+struct tcptemp *tcp_maketemplate(struct tcpcb *);
+void     tcp_fillheaders(struct tcpcb *, void *, void *);
+struct tcpcb *tcp_timers(struct tcpcb *, int);
+void     tcp_trace(int, int, struct tcpcb *, void *, struct tcphdr *, int);
+
+void tcp_fill_info(struct tcpcb *, struct tcp_info *);
+void tcp_sack_doack(struct tcpcb *, struct tcpopt *, struct tcphdr *,
+    u_int32_t *);
+extern boolean_t tcp_sack_process_dsack(struct tcpcb *, struct tcpopt *,
+    struct tcphdr *);
+int tcp_detect_bad_rexmt(struct tcpcb *, struct tcphdr *, struct tcpopt *,
+    u_int32_t rxtime);
+void     tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
+void     tcp_clean_sackreport(struct tcpcb *tp);
+void     tcp_sack_adjust(struct tcpcb *tp);

 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt);
 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt);

-void    tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
-void    tcp_free_sackholes(struct tcpcb *tp);
-
+void     tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
+void     tcp_free_sackholes(struct tcpcb *tp);
+int32_t  tcp_sbspace(struct tcpcb *tp);
+void     tcp_set_tso(struct tcpcb *tp, struct ifnet *ifp);
+void     tcp_set_ecn(struct tcpcb *tp, struct ifnet *ifp);
+void     tcp_reset_stretch_ack(struct tcpcb *tp);
+extern void tcp_get_ports_used(u_int32_t, int, u_int32_t, bitstr_t *);
+uint32_t tcp_count_opportunistic(unsigned int ifindex, u_int32_t flags);
+uint32_t tcp_find_anypcb_byaddr(struct ifaddr *ifa);
+void tcp_set_max_rwinscale(struct tcpcb *tp, struct socket *so, struct ifnet *ifp);
+struct bwmeas* tcp_bwmeas_alloc(struct tcpcb *tp);
+void tcp_bwmeas_free(struct tcpcb *tp);
+extern int32_t timer_diff(uint32_t t1, uint32_t toff1, uint32_t t2, uint32_t toff2);
+
+extern void tcp_set_background_cc(struct socket *);
+extern void tcp_set_foreground_cc(struct socket *);
+extern void tcp_set_recv_bg(struct socket *);
+extern void tcp_clear_recv_bg(struct socket *);
+extern boolean_t tcp_sack_byte_islost(struct tcpcb *tp);
+#define IS_TCP_RECV_BG(_so)     \
+       ((_so)->so_flags1 & SOF1_TRAFFIC_MGT_TCP_RECVBG)
+
+#if TRAFFIC_MGT
+#define CLEAR_IAJ_STATE(_tp_) (_tp_)->iaj_rcv_ts = 0
+void     reset_acc_iaj(struct tcpcb *tp);
+#endif /* TRAFFIC_MGT */
+
+int      tcp_lock(struct socket *, int, void *);
+int      tcp_unlock(struct socket *, int, void *);
+void     calculate_tcp_clock(void);
+
+extern void tcp_keepalive_reset(struct tcpcb *);
+extern uint32_t get_base_rtt(struct tcpcb *tp);

 
 

-int     tcp_lock (struct socket *, int, int);
-int     tcp_unlock (struct socket *, int, int);

 #ifdef _KERN_LOCKS_H_
 #ifdef _KERN_LOCKS_H_

-lck_mtx_t *     tcp_getlock (struct socket *, int);
+lck_mtx_t *      tcp_getlock(struct socket *, int);

 #else
 #else

-void *  tcp_getlock (struct socket *, int);
+void *   tcp_getlock(struct socket *, int);

 #endif
 
 #endif
 

-
-extern struct pr_usrreqs tcp_usrreqs;
-extern u_long tcp_sendspace;
-extern u_long tcp_recvspace;
+extern  struct pr_usrreqs tcp_usrreqs;
+extern  u_int32_t tcp_sendspace;
+extern  u_int32_t tcp_recvspace;

 tcp_seq tcp_new_isn(struct tcpcb *);
 
 tcp_seq tcp_new_isn(struct tcpcb *);
 

-#endif /* KERNEL_RPIVATE */
+extern int tcp_input_checksum(int, struct mbuf *, struct tcphdr *, int, int);
+extern void tcp_getconninfo(struct socket *, struct conninfo_tcp *);
+extern void add_to_time_wait(struct tcpcb *, uint32_t delay);
+extern void tcp_pmtud_revert_segment_size(struct tcpcb *tp);
+extern void tcp_rxtseg_insert(struct tcpcb *, tcp_seq, tcp_seq);
+extern struct tcp_rxt_seg *tcp_rxtseg_find(struct tcpcb *, tcp_seq, tcp_seq);
+extern void tcp_rxtseg_clean(struct tcpcb *);
+extern boolean_t tcp_rxtseg_detect_bad_rexmt(struct tcpcb *, tcp_seq);
+extern boolean_t tcp_rxtseg_dsack_for_tlp(struct tcpcb *);
+extern u_int32_t tcp_rxtseg_total_size(struct tcpcb *tp);
+extern void tcp_rexmt_save_state(struct tcpcb *tp);
+extern void tcp_interface_send_probe(u_int16_t if_index_available);
+extern void tcp_probe_connectivity(struct ifnet *ifp, u_int32_t enable);
+extern void tcp_get_connectivity_status(struct tcpcb *,
+    struct tcp_conn_status *);
+
+extern void tcp_clear_keep_alive_offload(struct socket *so);
+extern void tcp_fill_keepalive_offload_frames(struct ifnet *,
+    struct ifnet_keepalive_offload_frame *, u_int32_t, size_t, u_int32_t *);
+extern int tcp_notify_kao_timeout(ifnet_t ifp,
+    struct ifnet_keepalive_offload_frame *frame);
+
+extern boolean_t tfo_enabled(const struct tcpcb *tp);
+extern void tcp_disable_tfo(struct tcpcb *tp);
+extern void tcp_tfo_gen_cookie(struct inpcb *inp, u_char *out, size_t blk_size);
+#define TCP_FASTOPEN_KEYLEN 16
+extern int tcp_freeq(struct tcpcb *tp);
+extern errno_t tcp_notify_ack_id_valid(struct tcpcb *, struct socket *, u_int32_t);
+extern errno_t tcp_add_notify_ack_marker(struct tcpcb *, u_int32_t);
+extern void tcp_notify_ack_free(struct tcpcb *);
+extern void tcp_notify_acknowledgement(struct tcpcb *, struct socket *);
+extern void tcp_get_notify_ack_count(struct tcpcb *,
+    struct tcp_notify_ack_complete *);
+extern void tcp_get_notify_ack_ids(struct tcpcb *tp,
+    struct tcp_notify_ack_complete *);
+extern void tcp_update_mss_locked(struct socket *, struct ifnet *);
+
+extern int get_tcp_inp_list(struct inpcb **, int, inp_gen_t);
+extern bool tcp_notify_ack_active(struct socket *so);
+
+#if MPTCP
+extern int mptcp_input_preproc(struct tcpcb *tp, struct mbuf *m,
+    struct tcphdr *th, int drop_hdrlen);
+extern uint32_t mptcp_output_csum(struct mbuf *m, uint64_t dss_val,
+    uint32_t sseq, uint16_t dlen);
+extern int mptcp_adj_mss(struct tcpcb *, boolean_t);
+extern void mptcp_insert_rmap(struct tcpcb *tp, struct mbuf *m, struct tcphdr *th);
+#endif
+
+__private_extern__ void tcp_update_stats_per_flow(
+       struct ifnet_stats_per_flow *, struct ifnet *);
+
+#endif /* BSD_KERNEL_PRIVATE */

 
 #endif /* _NETINET_TCP_VAR_H_ */
 
 #endif /* _NETINET_TCP_VAR_H_ */