The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp_var.h

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1993, 1994, 1995
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)tcp_var.h   8.4 (Berkeley) 5/24/95
   30  * $FreeBSD: releng/11.1/sys/netinet/tcp_var.h 317368 2017-04-24 11:34:02Z smh $
   31  */
   32 
   33 #ifndef _NETINET_TCP_VAR_H_
   34 #define _NETINET_TCP_VAR_H_
   35 
   36 #include <netinet/tcp.h>
   37 #include <netinet/tcp_fsm.h>
   38 
   39 #ifdef _KERNEL
   40 #include <net/vnet.h>
   41 #include <sys/mbuf.h>
   42 
   43 /*
   44  * Kernel variables for tcp.
   45  */
   46 VNET_DECLARE(int, tcp_do_rfc1323);
   47 #define V_tcp_do_rfc1323        VNET(tcp_do_rfc1323)
   48 
   49 #endif /* _KERNEL */
   50 
   51 /* TCP segment queue entry */
   52 struct tseg_qent {
   53         LIST_ENTRY(tseg_qent) tqe_q;
   54         int     tqe_len;                /* TCP segment data length */
   55         struct  tcphdr *tqe_th;         /* a pointer to tcp header */
   56         struct  mbuf    *tqe_m;         /* mbuf contains packet */
   57 };
   58 LIST_HEAD(tsegqe_head, tseg_qent);
   59 
   60 struct sackblk {
   61         tcp_seq start;          /* start seq no. of sack block */
   62         tcp_seq end;            /* end seq no. */
   63 };
   64 
   65 struct sackhole {
   66         tcp_seq start;          /* start seq no. of hole */
   67         tcp_seq end;            /* end seq no. */
   68         tcp_seq rxmit;          /* next seq. no in hole to be retransmitted */
   69         TAILQ_ENTRY(sackhole) scblink;  /* scoreboard linkage */
   70 };
   71 
   72 struct sackhint {
   73         struct sackhole *nexthole;
   74         int             sack_bytes_rexmit;
   75         tcp_seq         last_sack_ack;  /* Most recent/largest sacked ack */
   76 
   77         int             ispare;         /* explicit pad for 64bit alignment */
   78         int             sacked_bytes;   /*
   79                                          * Total sacked bytes reported by the
   80                                          * receiver via sack option
   81                                          */
   82         uint32_t        _pad1[1];       /* TBD */
   83         uint64_t        _pad[1];        /* TBD */
   84 };
   85 
   86 struct tcptemp {
   87         u_char  tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
   88         struct  tcphdr tt_t;
   89 };
   90 
   91 #define tcp6cb          tcpcb  /* for KAME src sync over BSD*'s */
   92 
   93 /* 
   94  * TODO: We yet need to brave plowing in
   95  * to tcp_input() and the pru_usrreq() block.
   96  * Right now these go to the old standards which
   97  * are somewhat ok, but in the long term may
   98  * need to be changed. If we do tackle tcp_input()
   99  * then we need to get rid of the tcp_do_segment()
  100  * function below.
  101  */
  102 /* Flags for tcp functions */
  103 #define TCP_FUNC_BEING_REMOVED 0x01     /* Can no longer be referenced */
  104 struct tcpcb;
  105 struct inpcb;
  106 struct sockopt;
  107 struct socket;
  108 
  109 /*
  110  * If defining the optional tcp_timers, in the
  111  * tfb_tcp_timer_stop call you must use the
  112  * callout_async_drain() function with the
  113  * tcp_timer_discard callback. You should check
  114  * the return of callout_async_drain() and if 0
  115  * increment tt_draincnt. Since the timer sub-system
  116  * does not know your callbacks you must provide a
  117  * stop_all function that loops through and calls
  118  * tcp_timer_stop() with each of your defined timers.
  119  */
  120 struct tcp_function_block {
  121         char tfb_tcp_block_name[TCP_FUNCTION_NAME_LEN_MAX];
  122         int     (*tfb_tcp_output)(struct tcpcb *);
  123         void    (*tfb_tcp_do_segment)(struct mbuf *, struct tcphdr *,
  124                             struct socket *, struct tcpcb *,
  125                             int, int, uint8_t,
  126                             int);
  127         int     (*tfb_tcp_ctloutput)(struct socket *so, struct sockopt *sopt,
  128                             struct inpcb *inp, struct tcpcb *tp);
  129         /* Optional memory allocation/free routine */
  130         void    (*tfb_tcp_fb_init)(struct tcpcb *);
  131         void    (*tfb_tcp_fb_fini)(struct tcpcb *);
  132         /* Optional timers, must define all if you define one */
  133         int     (*tfb_tcp_timer_stop_all)(struct tcpcb *);
  134         void    (*tfb_tcp_timer_activate)(struct tcpcb *,
  135                             uint32_t, u_int);
  136         int     (*tfb_tcp_timer_active)(struct tcpcb *, uint32_t);
  137         void    (*tfb_tcp_timer_stop)(struct tcpcb *, uint32_t);
  138         void    (*tfb_tcp_rexmit_tmr)(struct tcpcb *);
  139         volatile uint32_t tfb_refcnt;
  140         uint32_t  tfb_flags;
  141 };
  142 
  143 struct tcp_function {
  144         TAILQ_ENTRY(tcp_function) tf_next;
  145         struct tcp_function_block *tf_fb;
  146 };
  147 
  148 TAILQ_HEAD(tcp_funchead, tcp_function);
  149 
  150 /*
  151  * Tcp control block, one per tcp; fields:
  152  * Organized for 16 byte cacheline efficiency.
  153  */
  154 struct tcpcb {
  155         struct  tsegqe_head t_segq;     /* segment reassembly queue */
  156         void    *t_pspare[2];           /* new reassembly queue */
  157         int     t_segqlen;              /* segment reassembly queue length */
  158         int     t_dupacks;              /* consecutive dup acks recd */
  159 
  160         struct tcp_timer *t_timers;     /* All the TCP timers in one struct */
  161 
  162         struct  inpcb *t_inpcb;         /* back pointer to internet pcb */
  163         int     t_state;                /* state of this connection */
  164         u_int   t_flags;
  165 
  166         struct  vnet *t_vnet;           /* back pointer to parent vnet */
  167 
  168         tcp_seq snd_una;                /* sent but unacknowledged */
  169         tcp_seq snd_max;                /* highest sequence number sent;
  170                                          * used to recognize retransmits
  171                                          */
  172         tcp_seq snd_nxt;                /* send next */
  173         tcp_seq snd_up;                 /* send urgent pointer */
  174 
  175         tcp_seq snd_wl1;                /* window update seg seq number */
  176         tcp_seq snd_wl2;                /* window update seg ack number */
  177         tcp_seq iss;                    /* initial send sequence number */
  178         tcp_seq irs;                    /* initial receive sequence number */
  179 
  180         tcp_seq rcv_nxt;                /* receive next */
  181         tcp_seq rcv_adv;                /* advertised window */
  182         u_long  rcv_wnd;                /* receive window */
  183         tcp_seq rcv_up;                 /* receive urgent pointer */
  184 
  185         u_long  snd_wnd;                /* send window */
  186         u_long  snd_cwnd;               /* congestion-controlled window */
  187         u_long  snd_spare1;             /* unused */
  188         u_long  snd_ssthresh;           /* snd_cwnd size threshold for
  189                                          * for slow start exponential to
  190                                          * linear switch
  191                                          */
  192         u_long  snd_spare2;             /* unused */
  193         tcp_seq snd_recover;            /* for use in NewReno Fast Recovery */
  194 
  195         u_int   t_rcvtime;              /* inactivity time */
  196         u_int   t_starttime;            /* time connection was established */
  197         u_int   t_rtttime;              /* RTT measurement start time */
  198         tcp_seq t_rtseq;                /* sequence number being timed */
  199 
  200         u_int   t_bw_spare1;            /* unused */
  201         tcp_seq t_bw_spare2;            /* unused */
  202 
  203         int     t_rxtcur;               /* current retransmit value (ticks) */
  204         u_int   t_maxseg;               /* maximum segment size */
  205         u_int   t_pmtud_saved_maxseg;   /* pre-blackhole MSS */
  206         int     t_srtt;                 /* smoothed round-trip time */
  207         int     t_rttvar;               /* variance in round-trip time */
  208 
  209         int     t_rxtshift;             /* log(2) of rexmt exp. backoff */
  210         u_int   t_rttmin;               /* minimum rtt allowed */
  211         u_int   t_rttbest;              /* best rtt we've seen */
  212         u_long  t_rttupdated;           /* number of times rtt sampled */
  213         u_long  max_sndwnd;             /* largest window peer has offered */
  214 
  215         int     t_softerror;            /* possible error not yet reported */
  216 /* out-of-band data */
  217         char    t_oobflags;             /* have some */
  218         char    t_iobc;                 /* input character */
  219 /* RFC 1323 variables */
  220         u_char  snd_scale;              /* window scaling for send window */
  221         u_char  rcv_scale;              /* window scaling for recv window */
  222         u_char  request_r_scale;        /* pending window scaling */
  223         u_int32_t  ts_recent;           /* timestamp echo data */
  224         u_int   ts_recent_age;          /* when last updated */
  225         u_int32_t  ts_offset;           /* our timestamp offset */
  226 
  227         tcp_seq last_ack_sent;
  228 /* experimental */
  229         u_long  snd_cwnd_prev;          /* cwnd prior to retransmit */
  230         u_long  snd_ssthresh_prev;      /* ssthresh prior to retransmit */
  231         tcp_seq snd_recover_prev;       /* snd_recover prior to retransmit */
  232         int     t_sndzerowin;           /* zero-window updates sent */
  233         u_int   t_badrxtwin;            /* window for retransmit recovery */
  234         u_char  snd_limited;            /* segments limited transmitted */
  235 /* SACK related state */
  236         int     snd_numholes;           /* number of holes seen by sender */
  237         TAILQ_HEAD(sackhole_head, sackhole) snd_holes;
  238                                         /* SACK scoreboard (sorted) */
  239         tcp_seq snd_fack;               /* last seq number(+1) sack'd by rcv'r*/
  240         int     rcv_numsacks;           /* # distinct sack blks present */
  241         struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
  242         tcp_seq sack_newdata;           /* New data xmitted in this recovery
  243                                            episode starts at this seq number */
  244         struct sackhint sackhint;       /* SACK scoreboard hint */
  245         int     t_rttlow;               /* smallest observerved RTT */
  246         u_int32_t       rfbuf_ts;       /* recv buffer autoscaling timestamp */
  247         int     rfbuf_cnt;              /* recv buffer autoscaling byte count */
  248         struct toedev   *tod;           /* toedev handling this connection */
  249         int     t_sndrexmitpack;        /* retransmit packets sent */
  250         int     t_rcvoopack;            /* out-of-order packets received */
  251         void    *t_toe;                 /* TOE pcb pointer */
  252         int     t_bytes_acked;          /* # bytes acked during current RTT */
  253         struct cc_algo  *cc_algo;       /* congestion control algorithm */
  254         struct cc_var   *ccv;           /* congestion control specific vars */
  255         struct osd      *osd;           /* storage for Khelp module data */
  256 
  257         u_int   t_keepinit;             /* time to establish connection */
  258         u_int   t_keepidle;             /* time before keepalive probes begin */
  259         u_int   t_keepintvl;            /* interval between keepalives */
  260         u_int   t_keepcnt;              /* number of keepalives before close */
  261 
  262         u_int   t_tsomax;               /* TSO total burst length limit in bytes */
  263         u_int   t_tsomaxsegcount;       /* TSO maximum segment count */
  264         u_int   t_tsomaxsegsize;        /* TSO maximum segment size in bytes */
  265         u_int   t_flags2;               /* More tcpcb flags storage */
  266 #if defined(_KERNEL) && defined(TCP_RFC7413)
  267         uint32_t t_ispare[6];           /* 5 UTO, 1 TBD */
  268         uint64_t t_tfo_cookie;          /* TCP Fast Open cookie */
  269 #else
  270         uint32_t t_ispare[8];           /* 5 UTO, 3 TBD */
  271 #endif
  272         struct tcp_function_block *t_fb;/* TCP function call block */
  273         void    *t_fb_ptr;              /* Pointer to t_fb specific data */
  274 #if defined(_KERNEL) && defined(TCP_RFC7413)
  275         unsigned int *t_tfo_pending;    /* TCP Fast Open pending counter */
  276         void    *t_pspare2[1];          /* 1 TCP_SIGNATURE */
  277 #else
  278         void    *t_pspare2[2];          /* 1 TCP_SIGNATURE, 1 TBD */
  279 #endif
  280 #if defined(_KERNEL) && defined(TCPPCAP)
  281         struct mbufq t_inpkts;          /* List of saved input packets. */
  282         struct mbufq t_outpkts;         /* List of saved output packets. */
  283 #ifdef _LP64
  284         uint64_t _pad[0];               /* all used! */
  285 #else
  286         uint64_t _pad[2];               /* 2 are available */
  287 #endif /* _LP64 */
  288 #else
  289         uint64_t _pad[6];
  290 #endif /* defined(_KERNEL) && defined(TCPPCAP) */
  291 };
  292 
  293 /*
  294  * Flags and utility macros for the t_flags field.
  295  */
  296 #define TF_ACKNOW       0x000001        /* ack peer immediately */
  297 #define TF_DELACK       0x000002        /* ack, but try to delay it */
  298 #define TF_NODELAY      0x000004        /* don't delay packets to coalesce */
  299 #define TF_NOOPT        0x000008        /* don't use tcp options */
  300 #define TF_SENTFIN      0x000010        /* have sent FIN */
  301 #define TF_REQ_SCALE    0x000020        /* have/will request window scaling */
  302 #define TF_RCVD_SCALE   0x000040        /* other side has requested scaling */
  303 #define TF_REQ_TSTMP    0x000080        /* have/will request timestamps */
  304 #define TF_RCVD_TSTMP   0x000100        /* a timestamp was received in SYN */
  305 #define TF_SACK_PERMIT  0x000200        /* other side said I could SACK */
  306 #define TF_NEEDSYN      0x000400        /* send SYN (implicit state) */
  307 #define TF_NEEDFIN      0x000800        /* send FIN (implicit state) */
  308 #define TF_NOPUSH       0x001000        /* don't push */
  309 #define TF_PREVVALID    0x002000        /* saved values for bad rxmit valid */
  310 #define TF_MORETOCOME   0x010000        /* More data to be appended to sock */
  311 #define TF_LQ_OVERFLOW  0x020000        /* listen queue overflow */
  312 #define TF_LASTIDLE     0x040000        /* connection was previously idle */
  313 #define TF_RXWIN0SENT   0x080000        /* sent a receiver win 0 in response */
  314 #define TF_FASTRECOVERY 0x100000        /* in NewReno Fast Recovery */
  315 #define TF_WASFRECOVERY 0x200000        /* was in NewReno Fast Recovery */
  316 #define TF_SIGNATURE    0x400000        /* require MD5 digests (RFC2385) */
  317 #define TF_FORCEDATA    0x800000        /* force out a byte */
  318 #define TF_TSO          0x1000000       /* TSO enabled on this connection */
  319 #define TF_TOE          0x2000000       /* this connection is offloaded */
  320 #define TF_ECN_PERMIT   0x4000000       /* connection ECN-ready */
  321 #define TF_ECN_SND_CWR  0x8000000       /* ECN CWR in queue */
  322 #define TF_ECN_SND_ECE  0x10000000      /* ECN ECE in queue */
  323 #define TF_CONGRECOVERY 0x20000000      /* congestion recovery mode */
  324 #define TF_WASCRECOVERY 0x40000000      /* was in congestion recovery */
  325 #define TF_FASTOPEN     0x80000000      /* TCP Fast Open indication */
  326 
  327 #define IN_FASTRECOVERY(t_flags)        (t_flags & TF_FASTRECOVERY)
  328 #define ENTER_FASTRECOVERY(t_flags)     t_flags |= TF_FASTRECOVERY
  329 #define EXIT_FASTRECOVERY(t_flags)      t_flags &= ~TF_FASTRECOVERY
  330 
  331 #define IN_CONGRECOVERY(t_flags)        (t_flags & TF_CONGRECOVERY)
  332 #define ENTER_CONGRECOVERY(t_flags)     t_flags |= TF_CONGRECOVERY
  333 #define EXIT_CONGRECOVERY(t_flags)      t_flags &= ~TF_CONGRECOVERY
  334 
  335 #define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY))
  336 #define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY)
  337 #define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY)
  338 
  339 #define BYTES_THIS_ACK(tp, th)  (th->th_ack - tp->snd_una)
  340 
  341 /*
  342  * Flags for the t_oobflags field.
  343  */
  344 #define TCPOOB_HAVEDATA 0x01
  345 #define TCPOOB_HADDATA  0x02
  346 
  347 /*
  348  * Flags for PLPMTU handling, t_flags2
  349  */
  350 #define TF2_PLPMTU_BLACKHOLE    0x00000001 /* Possible PLPMTUD Black Hole. */
  351 #define TF2_PLPMTU_PMTUD        0x00000002 /* Allowed to attempt PLPMTUD. */
  352 #define TF2_PLPMTU_MAXSEGSNT    0x00000004 /* Last seg sent was full seg. */
  353 
  354 /*
  355  * Structure to hold TCP options that are only used during segment
  356  * processing (in tcp_input), but not held in the tcpcb.
  357  * It's basically used to reduce the number of parameters
  358  * to tcp_dooptions and tcp_addoptions.
  359  * The binary order of the to_flags is relevant for packing of the
  360  * options in tcp_addoptions.
  361  */
  362 struct tcpopt {
  363         u_int32_t       to_flags;       /* which options are present */
  364 #define TOF_MSS         0x0001          /* maximum segment size */
  365 #define TOF_SCALE       0x0002          /* window scaling */
  366 #define TOF_SACKPERM    0x0004          /* SACK permitted */
  367 #define TOF_TS          0x0010          /* timestamp */
  368 #define TOF_SIGNATURE   0x0040          /* TCP-MD5 signature option (RFC2385) */
  369 #define TOF_SACK        0x0080          /* Peer sent SACK option */
  370 #define TOF_FASTOPEN    0x0100          /* TCP Fast Open (TFO) cookie */
  371 #define TOF_MAXOPT      0x0200
  372         u_int32_t       to_tsval;       /* new timestamp */
  373         u_int32_t       to_tsecr;       /* reflected timestamp */
  374         u_char          *to_sacks;      /* pointer to the first SACK blocks */
  375         u_char          *to_signature;  /* pointer to the TCP-MD5 signature */
  376         u_char          *to_tfo_cookie; /* pointer to the TFO cookie */
  377         u_int16_t       to_mss;         /* maximum segment size */
  378         u_int8_t        to_wscale;      /* window scaling */
  379         u_int8_t        to_nsacks;      /* number of SACK blocks */
  380         u_int8_t        to_tfo_len;     /* TFO cookie length */
  381         u_int32_t       to_spare;       /* UTO */
  382 };
  383 
  384 /*
  385  * Flags for tcp_dooptions.
  386  */
  387 #define TO_SYN          0x01            /* parse SYN-only options */
  388 
  389 struct hc_metrics_lite {        /* must stay in sync with hc_metrics */
  390         u_long  rmx_mtu;        /* MTU for this path */
  391         u_long  rmx_ssthresh;   /* outbound gateway buffer limit */
  392         u_long  rmx_rtt;        /* estimated round trip time */
  393         u_long  rmx_rttvar;     /* estimated rtt variance */
  394         u_long  rmx_cwnd;       /* congestion window */
  395         u_long  rmx_sendpipe;   /* outbound delay-bandwidth product */
  396         u_long  rmx_recvpipe;   /* inbound delay-bandwidth product */
  397 };
  398 
  399 /*
  400  * Used by tcp_maxmtu() to communicate interface specific features
  401  * and limits at the time of connection setup.
  402  */
  403 struct tcp_ifcap {
  404         int     ifcap;
  405         u_int   tsomax;
  406         u_int   tsomaxsegcount;
  407         u_int   tsomaxsegsize;
  408 };
  409 
  410 #ifndef _NETINET_IN_PCB_H_
  411 struct in_conninfo;
  412 #endif /* _NETINET_IN_PCB_H_ */
  413 
  414 struct tcptw {
  415         struct inpcb    *tw_inpcb;      /* XXX back pointer to internet pcb */
  416         tcp_seq         snd_nxt;
  417         tcp_seq         rcv_nxt;
  418         tcp_seq         iss;
  419         tcp_seq         irs;
  420         u_short         last_win;       /* cached window value */
  421         u_short         tw_so_options;  /* copy of so_options */
  422         struct ucred    *tw_cred;       /* user credentials */
  423         u_int32_t       t_recent;
  424         u_int32_t       ts_offset;      /* our timestamp offset */
  425         u_int           t_starttime;
  426         int             tw_time;
  427         TAILQ_ENTRY(tcptw) tw_2msl;
  428         void            *tw_pspare;     /* TCP_SIGNATURE */
  429         u_int           *tw_spare;      /* TCP_SIGNATURE */
  430 };
  431 
  432 #define intotcpcb(ip)   ((struct tcpcb *)(ip)->inp_ppcb)
  433 #define intotw(ip)      ((struct tcptw *)(ip)->inp_ppcb)
  434 #define sototcpcb(so)   (intotcpcb(sotoinpcb(so)))
  435 
  436 /*
  437  * The smoothed round-trip time and estimated variance
  438  * are stored as fixed point numbers scaled by the values below.
  439  * For convenience, these scales are also used in smoothing the average
  440  * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
  441  * With these scales, srtt has 3 bits to the right of the binary point,
  442  * and thus an "ALPHA" of 0.875.  rttvar has 2 bits to the right of the
  443  * binary point, and is smoothed with an ALPHA of 0.75.
  444  */
  445 #define TCP_RTT_SCALE           32      /* multiplier for srtt; 3 bits frac. */
  446 #define TCP_RTT_SHIFT           5       /* shift for srtt; 3 bits frac. */
  447 #define TCP_RTTVAR_SCALE        16      /* multiplier for rttvar; 2 bits */
  448 #define TCP_RTTVAR_SHIFT        4       /* shift for rttvar; 2 bits */
  449 #define TCP_DELTA_SHIFT         2       /* see tcp_input.c */
  450 
  451 /*
  452  * The initial retransmission should happen at rtt + 4 * rttvar.
  453  * Because of the way we do the smoothing, srtt and rttvar
  454  * will each average +1/2 tick of bias.  When we compute
  455  * the retransmit timer, we want 1/2 tick of rounding and
  456  * 1 extra tick because of +-1/2 tick uncertainty in the
  457  * firing of the timer.  The bias will give us exactly the
  458  * 1.5 tick we need.  But, because the bias is
  459  * statistical, we have to test that we don't drop below
  460  * the minimum feasible timer (which is 2 ticks).
  461  * This version of the macro adapted from a paper by Lawrence
  462  * Brakmo and Larry Peterson which outlines a problem caused
  463  * by insufficient precision in the original implementation,
  464  * which results in inappropriately large RTO values for very
  465  * fast networks.
  466  */
  467 #define TCP_REXMTVAL(tp) \
  468         max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT))  \
  469           + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
  470 
  471 /*
  472  * TCP statistics.
  473  * Many of these should be kept per connection,
  474  * but that's inconvenient at the moment.
  475  */
  476 struct  tcpstat {
  477         uint64_t tcps_connattempt;      /* connections initiated */
  478         uint64_t tcps_accepts;          /* connections accepted */
  479         uint64_t tcps_connects;         /* connections established */
  480         uint64_t tcps_drops;            /* connections dropped */
  481         uint64_t tcps_conndrops;        /* embryonic connections dropped */
  482         uint64_t tcps_minmssdrops;      /* average minmss too low drops */
  483         uint64_t tcps_closed;           /* conn. closed (includes drops) */
  484         uint64_t tcps_segstimed;        /* segs where we tried to get rtt */
  485         uint64_t tcps_rttupdated;       /* times we succeeded */
  486         uint64_t tcps_delack;           /* delayed acks sent */
  487         uint64_t tcps_timeoutdrop;      /* conn. dropped in rxmt timeout */
  488         uint64_t tcps_rexmttimeo;       /* retransmit timeouts */
  489         uint64_t tcps_persisttimeo;     /* persist timeouts */
  490         uint64_t tcps_keeptimeo;        /* keepalive timeouts */
  491         uint64_t tcps_keepprobe;        /* keepalive probes sent */
  492         uint64_t tcps_keepdrops;        /* connections dropped in keepalive */
  493 
  494         uint64_t tcps_sndtotal;         /* total packets sent */
  495         uint64_t tcps_sndpack;          /* data packets sent */
  496         uint64_t tcps_sndbyte;          /* data bytes sent */
  497         uint64_t tcps_sndrexmitpack;    /* data packets retransmitted */
  498         uint64_t tcps_sndrexmitbyte;    /* data bytes retransmitted */
  499         uint64_t tcps_sndrexmitbad;     /* unnecessary packet retransmissions */
  500         uint64_t tcps_sndacks;          /* ack-only packets sent */
  501         uint64_t tcps_sndprobe;         /* window probes sent */
  502         uint64_t tcps_sndurg;           /* packets sent with URG only */
  503         uint64_t tcps_sndwinup;         /* window update-only packets sent */
  504         uint64_t tcps_sndctrl;          /* control (SYN|FIN|RST) packets sent */
  505 
  506         uint64_t tcps_rcvtotal;         /* total packets received */
  507         uint64_t tcps_rcvpack;          /* packets received in sequence */
  508         uint64_t tcps_rcvbyte;          /* bytes received in sequence */
  509         uint64_t tcps_rcvbadsum;        /* packets received with ccksum errs */
  510         uint64_t tcps_rcvbadoff;        /* packets received with bad offset */
  511         uint64_t tcps_rcvreassfull;     /* packets dropped for no reass space */
  512         uint64_t tcps_rcvshort;         /* packets received too short */
  513         uint64_t tcps_rcvduppack;       /* duplicate-only packets received */
  514         uint64_t tcps_rcvdupbyte;       /* duplicate-only bytes received */
  515         uint64_t tcps_rcvpartduppack;   /* packets with some duplicate data */
  516         uint64_t tcps_rcvpartdupbyte;   /* dup. bytes in part-dup. packets */
  517         uint64_t tcps_rcvoopack;        /* out-of-order packets received */
  518         uint64_t tcps_rcvoobyte;        /* out-of-order bytes received */
  519         uint64_t tcps_rcvpackafterwin;  /* packets with data after window */
  520         uint64_t tcps_rcvbyteafterwin;  /* bytes rcvd after window */
  521         uint64_t tcps_rcvafterclose;    /* packets rcvd after "close" */
  522         uint64_t tcps_rcvwinprobe;      /* rcvd window probe packets */
  523         uint64_t tcps_rcvdupack;        /* rcvd duplicate acks */
  524         uint64_t tcps_rcvacktoomuch;    /* rcvd acks for unsent data */
  525         uint64_t tcps_rcvackpack;       /* rcvd ack packets */
  526         uint64_t tcps_rcvackbyte;       /* bytes acked by rcvd acks */
  527         uint64_t tcps_rcvwinupd;        /* rcvd window update packets */
  528         uint64_t tcps_pawsdrop;         /* segments dropped due to PAWS */
  529         uint64_t tcps_predack;          /* times hdr predict ok for acks */
  530         uint64_t tcps_preddat;          /* times hdr predict ok for data pkts */
  531         uint64_t tcps_pcbcachemiss;
  532         uint64_t tcps_cachedrtt;        /* times cached RTT in route updated */
  533         uint64_t tcps_cachedrttvar;     /* times cached rttvar updated */
  534         uint64_t tcps_cachedssthresh;   /* times cached ssthresh updated */
  535         uint64_t tcps_usedrtt;          /* times RTT initialized from route */
  536         uint64_t tcps_usedrttvar;       /* times RTTVAR initialized from rt */
  537         uint64_t tcps_usedssthresh;     /* times ssthresh initialized from rt*/
  538         uint64_t tcps_persistdrop;      /* timeout in persist state */
  539         uint64_t tcps_badsyn;           /* bogus SYN, e.g. premature ACK */
  540         uint64_t tcps_mturesent;        /* resends due to MTU discovery */
  541         uint64_t tcps_listendrop;       /* listen queue overflows */
  542         uint64_t tcps_badrst;           /* ignored RSTs in the window */
  543 
  544         uint64_t tcps_sc_added;         /* entry added to syncache */
  545         uint64_t tcps_sc_retransmitted; /* syncache entry was retransmitted */
  546         uint64_t tcps_sc_dupsyn;        /* duplicate SYN packet */
  547         uint64_t tcps_sc_dropped;       /* could not reply to packet */
  548         uint64_t tcps_sc_completed;     /* successful extraction of entry */
  549         uint64_t tcps_sc_bucketoverflow;/* syncache per-bucket limit hit */
  550         uint64_t tcps_sc_cacheoverflow; /* syncache cache limit hit */
  551         uint64_t tcps_sc_reset;         /* RST removed entry from syncache */
  552         uint64_t tcps_sc_stale;         /* timed out or listen socket gone */
  553         uint64_t tcps_sc_aborted;       /* syncache entry aborted */
  554         uint64_t tcps_sc_badack;        /* removed due to bad ACK */
  555         uint64_t tcps_sc_unreach;       /* ICMP unreachable received */
  556         uint64_t tcps_sc_zonefail;      /* zalloc() failed */
  557         uint64_t tcps_sc_sendcookie;    /* SYN cookie sent */
  558         uint64_t tcps_sc_recvcookie;    /* SYN cookie received */
  559 
  560         uint64_t tcps_hc_added;         /* entry added to hostcache */
  561         uint64_t tcps_hc_bucketoverflow;/* hostcache per bucket limit hit */
  562 
  563         uint64_t tcps_finwait2_drops;    /* Drop FIN_WAIT_2 connection after time limit */
  564 
  565         /* SACK related stats */
  566         uint64_t tcps_sack_recovery_episode; /* SACK recovery episodes */
  567         uint64_t tcps_sack_rexmits;         /* SACK rexmit segments   */
  568         uint64_t tcps_sack_rexmit_bytes;    /* SACK rexmit bytes      */
  569         uint64_t tcps_sack_rcv_blocks;      /* SACK blocks (options) received */
  570         uint64_t tcps_sack_send_blocks;     /* SACK blocks (options) sent     */
  571         uint64_t tcps_sack_sboverflow;      /* times scoreboard overflowed */
  572         
  573         /* ECN related stats */
  574         uint64_t tcps_ecn_ce;           /* ECN Congestion Experienced */
  575         uint64_t tcps_ecn_ect0;         /* ECN Capable Transport */
  576         uint64_t tcps_ecn_ect1;         /* ECN Capable Transport */
  577         uint64_t tcps_ecn_shs;          /* ECN successful handshakes */
  578         uint64_t tcps_ecn_rcwnd;        /* # times ECN reduced the cwnd */
  579 
  580         /* TCP_SIGNATURE related stats */
  581         uint64_t tcps_sig_rcvgoodsig;   /* Total matching signature received */
  582         uint64_t tcps_sig_rcvbadsig;    /* Total bad signature received */
  583         uint64_t tcps_sig_err_buildsig; /* Failed to make signature */
  584         uint64_t tcps_sig_err_sigopt;   /* No signature expected by socket */
  585         uint64_t tcps_sig_err_nosigopt; /* No signature provided by segment */
  586 
  587         uint64_t _pad[12];              /* 6 UTO, 6 TBD */
  588 };
  589 
  590 #define tcps_rcvmemdrop tcps_rcvreassfull       /* compat */
  591 
  592 #ifdef _KERNEL
  593 #define TI_UNLOCKED     1
  594 #define TI_RLOCKED      2
  595 #include <sys/counter.h>
  596 
  597 VNET_PCPUSTAT_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */
  598 /*
  599  * In-kernel consumers can use these accessor macros directly to update
  600  * stats.
  601  */
  602 #define TCPSTAT_ADD(name, val)  \
  603     VNET_PCPUSTAT_ADD(struct tcpstat, tcpstat, name, (val))
  604 #define TCPSTAT_INC(name)       TCPSTAT_ADD(name, 1)
  605 
  606 /*
  607  * Kernel module consumers must use this accessor macro.
  608  */
  609 void    kmod_tcpstat_inc(int statnum);
  610 #define KMOD_TCPSTAT_INC(name)                                          \
  611     kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(uint64_t))
  612 
  613 /*
  614  * Running TCP connection count by state.
  615  */
  616 VNET_DECLARE(counter_u64_t, tcps_states[TCP_NSTATES]);
  617 #define V_tcps_states   VNET(tcps_states)
  618 #define TCPSTATES_INC(state)    counter_u64_add(V_tcps_states[state], 1)
  619 #define TCPSTATES_DEC(state)    counter_u64_add(V_tcps_states[state], -1)
  620 
  621 /*
  622  * TCP specific helper hook point identifiers.
  623  */
  624 #define HHOOK_TCP_EST_IN                0
  625 #define HHOOK_TCP_EST_OUT               1
  626 #define HHOOK_TCP_LAST                  HHOOK_TCP_EST_OUT
  627 
  628 struct tcp_hhook_data {
  629         struct tcpcb    *tp;
  630         struct tcphdr   *th;
  631         struct tcpopt   *to;
  632         long            len;
  633         int             tso;
  634         tcp_seq         curack;
  635 };
  636 #endif
  637 
  638 /*
  639  * TCB structure exported to user-land via sysctl(3).
  640  * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
  641  * included.  Not all of our clients do.
  642  */
  643 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
  644 struct xtcp_timer {
  645         int tt_rexmt;   /* retransmit timer */
  646         int tt_persist; /* retransmit persistence */
  647         int tt_keep;    /* keepalive */
  648         int tt_2msl;    /* 2*msl TIME_WAIT timer */
  649         int tt_delack;  /* delayed ACK timer */
  650         int t_rcvtime;  /* Time since last packet received */
  651 };
  652 struct  xtcpcb {
  653         size_t  xt_len;
  654         struct  inpcb   xt_inp;
  655         struct  tcpcb   xt_tp;
  656         struct  xsocket xt_socket;
  657         struct  xtcp_timer xt_timer;
  658         u_quad_t        xt_alignment_hack;
  659 };
  660 #endif
  661 
  662 /*
  663  * Identifiers for TCP sysctl nodes
  664  */
  665 #define TCPCTL_DO_RFC1323       1       /* use RFC-1323 extensions */
  666 #define TCPCTL_MSSDFLT          3       /* MSS default */
  667 #define TCPCTL_STATS            4       /* statistics */
  668 #define TCPCTL_RTTDFLT          5       /* default RTT estimate */
  669 #define TCPCTL_KEEPIDLE         6       /* keepalive idle timer */
  670 #define TCPCTL_KEEPINTVL        7       /* interval to send keepalives */
  671 #define TCPCTL_SENDSPACE        8       /* send buffer space */
  672 #define TCPCTL_RECVSPACE        9       /* receive buffer space */
  673 #define TCPCTL_KEEPINIT         10      /* timeout for establishing syn */
  674 #define TCPCTL_PCBLIST          11      /* list of all outstanding PCBs */
  675 #define TCPCTL_DELACKTIME       12      /* time before sending delayed ACK */
  676 #define TCPCTL_V6MSSDFLT        13      /* MSS default for IPv6 */
  677 #define TCPCTL_SACK             14      /* Selective Acknowledgement,rfc 2018 */
  678 #define TCPCTL_DROP             15      /* drop tcp connection */
  679 #define TCPCTL_STATES           16      /* connection counts by TCP state */
  680 
  681 #ifdef _KERNEL
  682 #ifdef SYSCTL_DECL
  683 SYSCTL_DECL(_net_inet_tcp);
  684 SYSCTL_DECL(_net_inet_tcp_sack);
  685 MALLOC_DECLARE(M_TCPLOG);
  686 #endif
  687 
  688 VNET_DECLARE(struct inpcbhead, tcb);            /* queue of active tcpcb's */
  689 VNET_DECLARE(struct inpcbinfo, tcbinfo);
  690 extern  int tcp_log_in_vain;
  691 VNET_DECLARE(int, tcp_mssdflt); /* XXX */
  692 VNET_DECLARE(int, tcp_minmss);
  693 VNET_DECLARE(int, tcp_delack_enabled);
  694 VNET_DECLARE(int, tcp_do_rfc3390);
  695 VNET_DECLARE(int, tcp_initcwnd_segments);
  696 VNET_DECLARE(int, tcp_sendspace);
  697 VNET_DECLARE(int, tcp_recvspace);
  698 VNET_DECLARE(int, path_mtu_discovery);
  699 VNET_DECLARE(int, tcp_do_rfc3465);
  700 VNET_DECLARE(int, tcp_abc_l_var);
  701 #define V_tcb                   VNET(tcb)
  702 #define V_tcbinfo               VNET(tcbinfo)
  703 #define V_tcp_mssdflt           VNET(tcp_mssdflt)
  704 #define V_tcp_minmss            VNET(tcp_minmss)
  705 #define V_tcp_delack_enabled    VNET(tcp_delack_enabled)
  706 #define V_tcp_do_rfc3390        VNET(tcp_do_rfc3390)
  707 #define V_tcp_initcwnd_segments VNET(tcp_initcwnd_segments)
  708 #define V_tcp_sendspace         VNET(tcp_sendspace)
  709 #define V_tcp_recvspace         VNET(tcp_recvspace)
  710 #define V_path_mtu_discovery    VNET(path_mtu_discovery)
  711 #define V_tcp_do_rfc3465        VNET(tcp_do_rfc3465)
  712 #define V_tcp_abc_l_var         VNET(tcp_abc_l_var)
  713 
  714 VNET_DECLARE(int, tcp_do_sack);                 /* SACK enabled/disabled */
  715 VNET_DECLARE(int, tcp_sc_rst_sock_fail);        /* RST on sock alloc failure */
  716 #define V_tcp_do_sack           VNET(tcp_do_sack)
  717 #define V_tcp_sc_rst_sock_fail  VNET(tcp_sc_rst_sock_fail)
  718 
  719 VNET_DECLARE(int, tcp_do_ecn);                  /* TCP ECN enabled/disabled */
  720 VNET_DECLARE(int, tcp_ecn_maxretries);
  721 #define V_tcp_do_ecn            VNET(tcp_do_ecn)
  722 #define V_tcp_ecn_maxretries    VNET(tcp_ecn_maxretries)
  723 
  724 VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]);
  725 #define V_tcp_hhh               VNET(tcp_hhh)
  726 
  727 VNET_DECLARE(int, tcp_do_rfc6675_pipe);
  728 #define V_tcp_do_rfc6675_pipe   VNET(tcp_do_rfc6675_pipe)
  729 
  730 int      tcp_addoptions(struct tcpopt *, u_char *);
  731 int      tcp_ccalgounload(struct cc_algo *unload_algo);
  732 struct tcpcb *
  733          tcp_close(struct tcpcb *);
  734 void     tcp_discardcb(struct tcpcb *);
  735 void     tcp_twstart(struct tcpcb *);
  736 void     tcp_twclose(struct tcptw *, int);
  737 void     tcp_ctlinput(int, struct sockaddr *, void *);
  738 int      tcp_ctloutput(struct socket *, struct sockopt *);
  739 struct tcpcb *
  740          tcp_drop(struct tcpcb *, int);
  741 void     tcp_drain(void);
  742 void     tcp_init(void);
  743 void     tcp_fini(void *);
  744 char    *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *,
  745             const void *);
  746 char    *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *,
  747             const void *);
  748 int      tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *);
  749 void     tcp_reass_global_init(void);
  750 void     tcp_reass_flush(struct tcpcb *);
  751 void     tcp_dooptions(struct tcpopt *, u_char *, int, int);
  752 void    tcp_dropwithreset(struct mbuf *, struct tcphdr *,
  753                      struct tcpcb *, int, int);
  754 void    tcp_pulloutofband(struct socket *,
  755                      struct tcphdr *, struct mbuf *, int);
  756 void    tcp_xmit_timer(struct tcpcb *, int);
  757 void    tcp_newreno_partial_ack(struct tcpcb *, struct tcphdr *);
  758 void    cc_ack_received(struct tcpcb *tp, struct tcphdr *th,
  759                             uint16_t type);
  760 void    cc_conn_init(struct tcpcb *tp);
  761 void    cc_post_recovery(struct tcpcb *tp, struct tcphdr *th);
  762 void    cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type);
  763 void    hhook_run_tcp_est_in(struct tcpcb *tp,
  764                             struct tcphdr *th, struct tcpopt *to);
  765 
  766 int      tcp_input(struct mbuf **, int *, int);
  767 int      tcp_autorcvbuf(struct mbuf *, struct tcphdr *, struct socket *,
  768             struct tcpcb *, int);
  769 void     tcp_do_segment(struct mbuf *, struct tcphdr *,
  770                         struct socket *, struct tcpcb *, int, int, uint8_t,
  771                         int);
  772 
  773 int register_tcp_functions(struct tcp_function_block *blk, int wait);
  774 int deregister_tcp_functions(struct tcp_function_block *blk);
  775 struct tcp_function_block *find_and_ref_tcp_functions(struct tcp_function_set *fs);
  776 struct tcp_function_block *find_and_ref_tcp_fb(struct tcp_function_block *blk);
  777 int tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp);
  778 
  779 u_long   tcp_maxmtu(struct in_conninfo *, struct tcp_ifcap *);
  780 u_long   tcp_maxmtu6(struct in_conninfo *, struct tcp_ifcap *);
  781 u_int    tcp_maxseg(const struct tcpcb *);
  782 void     tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *,
  783             struct tcp_ifcap *);
  784 void     tcp_mss(struct tcpcb *, int);
  785 int      tcp_mssopt(struct in_conninfo *);
  786 struct inpcb *
  787          tcp_drop_syn_sent(struct inpcb *, int);
  788 struct tcpcb *
  789          tcp_newtcpcb(struct inpcb *);
  790 int      tcp_output(struct tcpcb *);
  791 void     tcp_state_change(struct tcpcb *, int);
  792 void     tcp_respond(struct tcpcb *, void *,
  793             struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
  794 void     tcp_tw_init(void);
  795 #ifdef VIMAGE
  796 void     tcp_tw_destroy(void);
  797 #endif
  798 void     tcp_tw_zone_change(void);
  799 int      tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *,
  800             struct mbuf *, int);
  801 void     tcp_setpersist(struct tcpcb *);
  802 void     tcp_slowtimo(void);
  803 struct tcptemp *
  804          tcpip_maketemplate(struct inpcb *);
  805 void     tcpip_fillheaders(struct inpcb *, void *, void *);
  806 void     tcp_timer_activate(struct tcpcb *, uint32_t, u_int);
  807 int      tcp_timer_active(struct tcpcb *, uint32_t);
  808 void     tcp_timer_stop(struct tcpcb *, uint32_t);
  809 void     tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int);
  810 /*
  811  * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo)
  812  */
  813 void     tcp_hc_init(void);
  814 #ifdef VIMAGE
  815 void     tcp_hc_destroy(void);
  816 #endif
  817 void     tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *);
  818 u_long   tcp_hc_getmtu(struct in_conninfo *);
  819 void     tcp_hc_updatemtu(struct in_conninfo *, u_long);
  820 void     tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *);
  821 
  822 extern  struct pr_usrreqs tcp_usrreqs;
  823 tcp_seq tcp_new_isn(struct tcpcb *);
  824 
  825 int      tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq);
  826 void     tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
  827 void     tcp_clean_sackreport(struct tcpcb *tp);
  828 void     tcp_sack_adjust(struct tcpcb *tp);
  829 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt);
  830 void     tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
  831 void     tcp_free_sackholes(struct tcpcb *tp);
  832 int      tcp_newreno(struct tcpcb *, struct tcphdr *);
  833 int      tcp_compute_pipe(struct tcpcb *);
  834 
  835 static inline void
  836 tcp_fields_to_host(struct tcphdr *th)
  837 {
  838 
  839         th->th_seq = ntohl(th->th_seq);
  840         th->th_ack = ntohl(th->th_ack);
  841         th->th_win = ntohs(th->th_win);
  842         th->th_urp = ntohs(th->th_urp);
  843 }
  844 
  845 static inline void
  846 tcp_fields_to_net(struct tcphdr *th)
  847 {
  848 
  849         th->th_seq = htonl(th->th_seq);
  850         th->th_ack = htonl(th->th_ack);
  851         th->th_win = htons(th->th_win);
  852         th->th_urp = htons(th->th_urp);
  853 }
  854 #endif /* _KERNEL */
  855 
  856 #endif /* _NETINET_TCP_VAR_H_ */

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