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/8.0/sys/netinet/tcp_var.h 196039 2009-08-02 19:43:32Z rwatson $
   31  */
   32 
   33 #ifndef _NETINET_TCP_VAR_H_
   34 #define _NETINET_TCP_VAR_H_
   35 
   36 #include <netinet/tcp.h>
   37 
   38 #ifdef _KERNEL
   39 #include <net/vnet.h>
   40 
   41 /*
   42  * Kernel variables for tcp.
   43  */
   44 VNET_DECLARE(int, tcp_do_rfc1323);
   45 VNET_DECLARE(int, tcp_reass_qsize);
   46 VNET_DECLARE(struct uma_zone *, tcp_reass_zone);
   47 #define V_tcp_do_rfc1323        VNET(tcp_do_rfc1323)
   48 #define V_tcp_reass_qsize       VNET(tcp_reass_qsize)
   49 #define V_tcp_reass_zone        VNET(tcp_reass_zone)
   50 
   51 #endif /* _KERNEL */
   52 
   53 /* TCP segment queue entry */
   54 struct tseg_qent {
   55         LIST_ENTRY(tseg_qent) tqe_q;
   56         int     tqe_len;                /* TCP segment data length */
   57         struct  tcphdr *tqe_th;         /* a pointer to tcp header */
   58         struct  mbuf    *tqe_m;         /* mbuf contains packet */
   59 };
   60 LIST_HEAD(tsegqe_head, tseg_qent);
   61 
   62 struct sackblk {
   63         tcp_seq start;          /* start seq no. of sack block */
   64         tcp_seq end;            /* end seq no. */
   65 };
   66 
   67 struct sackhole {
   68         tcp_seq start;          /* start seq no. of hole */
   69         tcp_seq end;            /* end seq no. */
   70         tcp_seq rxmit;          /* next seq. no in hole to be retransmitted */
   71         TAILQ_ENTRY(sackhole) scblink;  /* scoreboard linkage */
   72 };
   73 
   74 struct sackhint {
   75         struct sackhole *nexthole;
   76         int             sack_bytes_rexmit;
   77 
   78         int             ispare;         /* explicit pad for 64bit alignment */
   79         uint64_t        _pad[2];        /* 1 sacked_bytes, 1 TBD */
   80 };
   81 
   82 struct tcptemp {
   83         u_char  tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
   84         struct  tcphdr tt_t;
   85 };
   86 
   87 #define tcp6cb          tcpcb  /* for KAME src sync over BSD*'s */
   88 
   89 /* Neighbor Discovery, Neighbor Unreachability Detection Upper layer hint. */
   90 #ifdef INET6
   91 #define ND6_HINT(tp)                                            \
   92 do {                                                            \
   93         if ((tp) && (tp)->t_inpcb &&                            \
   94             ((tp)->t_inpcb->inp_vflag & INP_IPV6) != 0)         \
   95                 nd6_nud_hint(NULL, NULL, 0);                    \
   96 } while (0)
   97 #else
   98 #define ND6_HINT(tp)
   99 #endif
  100 
  101 /*
  102  * Tcp control block, one per tcp; fields:
  103  * Organized for 16 byte cacheline efficiency.
  104  */
  105 struct tcpcb {
  106         struct  tsegqe_head t_segq;     /* segment reassembly queue */
  107         void    *t_pspare[2];           /* new reassembly queue */
  108         int     t_segqlen;              /* segment reassembly queue length */
  109         int     t_dupacks;              /* consecutive dup acks recd */
  110 
  111         struct tcp_timer *t_timers;     /* All the TCP timers in one struct */
  112 
  113         struct  inpcb *t_inpcb;         /* back pointer to internet pcb */
  114         int     t_state;                /* state of this connection */
  115         u_int   t_flags;
  116 
  117         struct  vnet *t_vnet;           /* back pointer to parent vnet */
  118 
  119         tcp_seq snd_una;                /* send unacknowledged */
  120         tcp_seq snd_max;                /* highest sequence number sent;
  121                                          * used to recognize retransmits
  122                                          */
  123         tcp_seq snd_nxt;                /* send next */
  124         tcp_seq snd_up;                 /* send urgent pointer */
  125 
  126         tcp_seq snd_wl1;                /* window update seg seq number */
  127         tcp_seq snd_wl2;                /* window update seg ack number */
  128         tcp_seq iss;                    /* initial send sequence number */
  129         tcp_seq irs;                    /* initial receive sequence number */
  130 
  131         tcp_seq rcv_nxt;                /* receive next */
  132         tcp_seq rcv_adv;                /* advertised window */
  133         u_long  rcv_wnd;                /* receive window */
  134         tcp_seq rcv_up;                 /* receive urgent pointer */
  135 
  136         u_long  snd_wnd;                /* send window */
  137         u_long  snd_cwnd;               /* congestion-controlled window */
  138         u_long  snd_bwnd;               /* bandwidth-controlled window */
  139         u_long  snd_ssthresh;           /* snd_cwnd size threshold for
  140                                          * for slow start exponential to
  141                                          * linear switch
  142                                          */
  143         u_long  snd_bandwidth;          /* calculated bandwidth or 0 */
  144         tcp_seq snd_recover;            /* for use in NewReno Fast Recovery */
  145 
  146         u_int   t_maxopd;               /* mss plus options */
  147 
  148         u_int   t_rcvtime;              /* inactivity time */
  149         u_int   t_starttime;            /* time connection was established */
  150         u_int   t_rtttime;              /* RTT measurement start time */
  151         tcp_seq t_rtseq;                /* sequence number being timed */
  152 
  153         u_int   t_bw_rtttime;           /* used for bandwidth calculation */
  154         tcp_seq t_bw_rtseq;             /* used for bandwidth calculation */
  155 
  156         int     t_rxtcur;               /* current retransmit value (ticks) */
  157         u_int   t_maxseg;               /* maximum segment size */
  158         int     t_srtt;                 /* smoothed round-trip time */
  159         int     t_rttvar;               /* variance in round-trip time */
  160 
  161         int     t_rxtshift;             /* log(2) of rexmt exp. backoff */
  162         u_int   t_rttmin;               /* minimum rtt allowed */
  163         u_int   t_rttbest;              /* best rtt we've seen */
  164         u_long  t_rttupdated;           /* number of times rtt sampled */
  165         u_long  max_sndwnd;             /* largest window peer has offered */
  166 
  167         int     t_softerror;            /* possible error not yet reported */
  168 /* out-of-band data */
  169         char    t_oobflags;             /* have some */
  170         char    t_iobc;                 /* input character */
  171 /* RFC 1323 variables */
  172         u_char  snd_scale;              /* window scaling for send window */
  173         u_char  rcv_scale;              /* window scaling for recv window */
  174         u_char  request_r_scale;        /* pending window scaling */
  175         u_int32_t  ts_recent;           /* timestamp echo data */
  176         u_int   ts_recent_age;          /* when last updated */
  177         u_int32_t  ts_offset;           /* our timestamp offset */
  178 
  179         tcp_seq last_ack_sent;
  180 /* experimental */
  181         u_long  snd_cwnd_prev;          /* cwnd prior to retransmit */
  182         u_long  snd_ssthresh_prev;      /* ssthresh prior to retransmit */
  183         tcp_seq snd_recover_prev;       /* snd_recover prior to retransmit */
  184         u_int   t_badrxtwin;            /* window for retransmit recovery */
  185         u_char  snd_limited;            /* segments limited transmitted */
  186 /* SACK related state */
  187         int     snd_numholes;           /* number of holes seen by sender */
  188         TAILQ_HEAD(sackhole_head, sackhole) snd_holes;
  189                                         /* SACK scoreboard (sorted) */
  190         tcp_seq snd_fack;               /* last seq number(+1) sack'd by rcv'r*/
  191         int     rcv_numsacks;           /* # distinct sack blks present */
  192         struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
  193         tcp_seq sack_newdata;           /* New data xmitted in this recovery
  194                                            episode starts at this seq number */
  195         struct sackhint sackhint;       /* SACK scoreboard hint */
  196         int     t_rttlow;               /* smallest observerved RTT */
  197         u_int32_t       rfbuf_ts;       /* recv buffer autoscaling timestamp */
  198         int     rfbuf_cnt;              /* recv buffer autoscaling byte count */
  199         struct toe_usrreqs *t_tu;       /* offload operations vector */
  200         void    *t_toe;                 /* TOE pcb pointer */
  201         int     t_bytes_acked;          /* # bytes acked during current RTT */
  202 
  203         int     t_ispare;               /* explicit pad for 64bit alignment */
  204         void    *t_pspare2[6];          /* 2 CC / 4 TBD */
  205         uint64_t _pad[12];              /* 7 UTO, 5 TBD (1-2 CC/RTT?) */
  206 };
  207 
  208 /*
  209  * Flags and utility macros for the t_flags field.
  210  */
  211 #define TF_ACKNOW       0x000001        /* ack peer immediately */
  212 #define TF_DELACK       0x000002        /* ack, but try to delay it */
  213 #define TF_NODELAY      0x000004        /* don't delay packets to coalesce */
  214 #define TF_NOOPT        0x000008        /* don't use tcp options */
  215 #define TF_SENTFIN      0x000010        /* have sent FIN */
  216 #define TF_REQ_SCALE    0x000020        /* have/will request window scaling */
  217 #define TF_RCVD_SCALE   0x000040        /* other side has requested scaling */
  218 #define TF_REQ_TSTMP    0x000080        /* have/will request timestamps */
  219 #define TF_RCVD_TSTMP   0x000100        /* a timestamp was received in SYN */
  220 #define TF_SACK_PERMIT  0x000200        /* other side said I could SACK */
  221 #define TF_NEEDSYN      0x000400        /* send SYN (implicit state) */
  222 #define TF_NEEDFIN      0x000800        /* send FIN (implicit state) */
  223 #define TF_NOPUSH       0x001000        /* don't push */
  224 #define TF_MORETOCOME   0x010000        /* More data to be appended to sock */
  225 #define TF_LQ_OVERFLOW  0x020000        /* listen queue overflow */
  226 #define TF_LASTIDLE     0x040000        /* connection was previously idle */
  227 #define TF_RXWIN0SENT   0x080000        /* sent a receiver win 0 in response */
  228 #define TF_FASTRECOVERY 0x100000        /* in NewReno Fast Recovery */
  229 #define TF_WASFRECOVERY 0x200000        /* was in NewReno Fast Recovery */
  230 #define TF_SIGNATURE    0x400000        /* require MD5 digests (RFC2385) */
  231 #define TF_FORCEDATA    0x800000        /* force out a byte */
  232 #define TF_TSO          0x1000000       /* TSO enabled on this connection */
  233 #define TF_TOE          0x2000000       /* this connection is offloaded */
  234 #define TF_ECN_PERMIT   0x4000000       /* connection ECN-ready */
  235 #define TF_ECN_SND_CWR  0x8000000       /* ECN CWR in queue */
  236 #define TF_ECN_SND_ECE  0x10000000      /* ECN ECE in queue */
  237 
  238 #define IN_FASTRECOVERY(tp)     (tp->t_flags & TF_FASTRECOVERY)
  239 #define ENTER_FASTRECOVERY(tp)  tp->t_flags |= TF_FASTRECOVERY
  240 #define EXIT_FASTRECOVERY(tp)   tp->t_flags &= ~TF_FASTRECOVERY
  241 
  242 /*
  243  * Flags for the t_oobflags field.
  244  */
  245 #define TCPOOB_HAVEDATA 0x01
  246 #define TCPOOB_HADDATA  0x02
  247 
  248 #ifdef TCP_SIGNATURE
  249 /*
  250  * Defines which are needed by the xform_tcp module and tcp_[in|out]put
  251  * for SADB verification and lookup.
  252  */
  253 #define TCP_SIGLEN      16      /* length of computed digest in bytes */
  254 #define TCP_KEYLEN_MIN  1       /* minimum length of TCP-MD5 key */
  255 #define TCP_KEYLEN_MAX  80      /* maximum length of TCP-MD5 key */
  256 /*
  257  * Only a single SA per host may be specified at this time. An SPI is
  258  * needed in order for the KEY_ALLOCSA() lookup to work.
  259  */
  260 #define TCP_SIG_SPI     0x1000
  261 #endif /* TCP_SIGNATURE */
  262 
  263 /*
  264  * Structure to hold TCP options that are only used during segment
  265  * processing (in tcp_input), but not held in the tcpcb.
  266  * It's basically used to reduce the number of parameters
  267  * to tcp_dooptions and tcp_addoptions.
  268  * The binary order of the to_flags is relevant for packing of the
  269  * options in tcp_addoptions.
  270  */
  271 struct tcpopt {
  272         u_int64_t       to_flags;       /* which options are present */
  273 #define TOF_MSS         0x0001          /* maximum segment size */
  274 #define TOF_SCALE       0x0002          /* window scaling */
  275 #define TOF_SACKPERM    0x0004          /* SACK permitted */
  276 #define TOF_TS          0x0010          /* timestamp */
  277 #define TOF_SIGNATURE   0x0040          /* TCP-MD5 signature option (RFC2385) */
  278 #define TOF_SACK        0x0080          /* Peer sent SACK option */
  279 #define TOF_MAXOPT      0x0100
  280         u_int32_t       to_tsval;       /* new timestamp */
  281         u_int32_t       to_tsecr;       /* reflected timestamp */
  282         u_char          *to_sacks;      /* pointer to the first SACK blocks */
  283         u_char          *to_signature;  /* pointer to the TCP-MD5 signature */
  284         u_int16_t       to_mss;         /* maximum segment size */
  285         u_int8_t        to_wscale;      /* window scaling */
  286         u_int8_t        to_nsacks;      /* number of SACK blocks */
  287 };
  288 
  289 /*
  290  * Flags for tcp_dooptions.
  291  */
  292 #define TO_SYN          0x01            /* parse SYN-only options */
  293 
  294 struct hc_metrics_lite {        /* must stay in sync with hc_metrics */
  295         u_long  rmx_mtu;        /* MTU for this path */
  296         u_long  rmx_ssthresh;   /* outbound gateway buffer limit */
  297         u_long  rmx_rtt;        /* estimated round trip time */
  298         u_long  rmx_rttvar;     /* estimated rtt variance */
  299         u_long  rmx_bandwidth;  /* estimated bandwidth */
  300         u_long  rmx_cwnd;       /* congestion window */
  301         u_long  rmx_sendpipe;   /* outbound delay-bandwidth product */
  302         u_long  rmx_recvpipe;   /* inbound delay-bandwidth product */
  303 };
  304 
  305 #ifndef _NETINET_IN_PCB_H_
  306 struct in_conninfo;
  307 #endif /* _NETINET_IN_PCB_H_ */
  308 
  309 struct tcptw {
  310         struct inpcb    *tw_inpcb;      /* XXX back pointer to internet pcb */
  311         tcp_seq         snd_nxt;
  312         tcp_seq         rcv_nxt;
  313         tcp_seq         iss;
  314         tcp_seq         irs;
  315         u_short         last_win;       /* cached window value */
  316         u_short         tw_so_options;  /* copy of so_options */
  317         struct ucred    *tw_cred;       /* user credentials */
  318         u_int32_t       t_recent;
  319         u_int32_t       ts_offset;      /* our timestamp offset */
  320         u_int           t_starttime;
  321         int             tw_time;
  322         TAILQ_ENTRY(tcptw) tw_2msl;
  323 };
  324 
  325 #define intotcpcb(ip)   ((struct tcpcb *)(ip)->inp_ppcb)
  326 #define intotw(ip)      ((struct tcptw *)(ip)->inp_ppcb)
  327 #define sototcpcb(so)   (intotcpcb(sotoinpcb(so)))
  328 
  329 /*
  330  * The smoothed round-trip time and estimated variance
  331  * are stored as fixed point numbers scaled by the values below.
  332  * For convenience, these scales are also used in smoothing the average
  333  * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
  334  * With these scales, srtt has 3 bits to the right of the binary point,
  335  * and thus an "ALPHA" of 0.875.  rttvar has 2 bits to the right of the
  336  * binary point, and is smoothed with an ALPHA of 0.75.
  337  */
  338 #define TCP_RTT_SCALE           32      /* multiplier for srtt; 3 bits frac. */
  339 #define TCP_RTT_SHIFT           5       /* shift for srtt; 3 bits frac. */
  340 #define TCP_RTTVAR_SCALE        16      /* multiplier for rttvar; 2 bits */
  341 #define TCP_RTTVAR_SHIFT        4       /* shift for rttvar; 2 bits */
  342 #define TCP_DELTA_SHIFT         2       /* see tcp_input.c */
  343 
  344 /*
  345  * The initial retransmission should happen at rtt + 4 * rttvar.
  346  * Because of the way we do the smoothing, srtt and rttvar
  347  * will each average +1/2 tick of bias.  When we compute
  348  * the retransmit timer, we want 1/2 tick of rounding and
  349  * 1 extra tick because of +-1/2 tick uncertainty in the
  350  * firing of the timer.  The bias will give us exactly the
  351  * 1.5 tick we need.  But, because the bias is
  352  * statistical, we have to test that we don't drop below
  353  * the minimum feasible timer (which is 2 ticks).
  354  * This version of the macro adapted from a paper by Lawrence
  355  * Brakmo and Larry Peterson which outlines a problem caused
  356  * by insufficient precision in the original implementation,
  357  * which results in inappropriately large RTO values for very
  358  * fast networks.
  359  */
  360 #define TCP_REXMTVAL(tp) \
  361         max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT))  \
  362           + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
  363 
  364 /*
  365  * TCP statistics.
  366  * Many of these should be kept per connection,
  367  * but that's inconvenient at the moment.
  368  */
  369 struct  tcpstat {
  370         u_long  tcps_connattempt;       /* connections initiated */
  371         u_long  tcps_accepts;           /* connections accepted */
  372         u_long  tcps_connects;          /* connections established */
  373         u_long  tcps_drops;             /* connections dropped */
  374         u_long  tcps_conndrops;         /* embryonic connections dropped */
  375         u_long  tcps_minmssdrops;       /* average minmss too low drops */
  376         u_long  tcps_closed;            /* conn. closed (includes drops) */
  377         u_long  tcps_segstimed;         /* segs where we tried to get rtt */
  378         u_long  tcps_rttupdated;        /* times we succeeded */
  379         u_long  tcps_delack;            /* delayed acks sent */
  380         u_long  tcps_timeoutdrop;       /* conn. dropped in rxmt timeout */
  381         u_long  tcps_rexmttimeo;        /* retransmit timeouts */
  382         u_long  tcps_persisttimeo;      /* persist timeouts */
  383         u_long  tcps_keeptimeo;         /* keepalive timeouts */
  384         u_long  tcps_keepprobe;         /* keepalive probes sent */
  385         u_long  tcps_keepdrops;         /* connections dropped in keepalive */
  386 
  387         u_long  tcps_sndtotal;          /* total packets sent */
  388         u_long  tcps_sndpack;           /* data packets sent */
  389         u_long  tcps_sndbyte;           /* data bytes sent */
  390         u_long  tcps_sndrexmitpack;     /* data packets retransmitted */
  391         u_long  tcps_sndrexmitbyte;     /* data bytes retransmitted */
  392         u_long  tcps_sndrexmitbad;      /* unnecessary packet retransmissions */
  393         u_long  tcps_sndacks;           /* ack-only packets sent */
  394         u_long  tcps_sndprobe;          /* window probes sent */
  395         u_long  tcps_sndurg;            /* packets sent with URG only */
  396         u_long  tcps_sndwinup;          /* window update-only packets sent */
  397         u_long  tcps_sndctrl;           /* control (SYN|FIN|RST) packets sent */
  398 
  399         u_long  tcps_rcvtotal;          /* total packets received */
  400         u_long  tcps_rcvpack;           /* packets received in sequence */
  401         u_long  tcps_rcvbyte;           /* bytes received in sequence */
  402         u_long  tcps_rcvbadsum;         /* packets received with ccksum errs */
  403         u_long  tcps_rcvbadoff;         /* packets received with bad offset */
  404         u_long  tcps_rcvmemdrop;        /* packets dropped for lack of memory */
  405         u_long  tcps_rcvshort;          /* packets received too short */
  406         u_long  tcps_rcvduppack;        /* duplicate-only packets received */
  407         u_long  tcps_rcvdupbyte;        /* duplicate-only bytes received */
  408         u_long  tcps_rcvpartduppack;    /* packets with some duplicate data */
  409         u_long  tcps_rcvpartdupbyte;    /* dup. bytes in part-dup. packets */
  410         u_long  tcps_rcvoopack;         /* out-of-order packets received */
  411         u_long  tcps_rcvoobyte;         /* out-of-order bytes received */
  412         u_long  tcps_rcvpackafterwin;   /* packets with data after window */
  413         u_long  tcps_rcvbyteafterwin;   /* bytes rcvd after window */
  414         u_long  tcps_rcvafterclose;     /* packets rcvd after "close" */
  415         u_long  tcps_rcvwinprobe;       /* rcvd window probe packets */
  416         u_long  tcps_rcvdupack;         /* rcvd duplicate acks */
  417         u_long  tcps_rcvacktoomuch;     /* rcvd acks for unsent data */
  418         u_long  tcps_rcvackpack;        /* rcvd ack packets */
  419         u_long  tcps_rcvackbyte;        /* bytes acked by rcvd acks */
  420         u_long  tcps_rcvwinupd;         /* rcvd window update packets */
  421         u_long  tcps_pawsdrop;          /* segments dropped due to PAWS */
  422         u_long  tcps_predack;           /* times hdr predict ok for acks */
  423         u_long  tcps_preddat;           /* times hdr predict ok for data pkts */
  424         u_long  tcps_pcbcachemiss;
  425         u_long  tcps_cachedrtt;         /* times cached RTT in route updated */
  426         u_long  tcps_cachedrttvar;      /* times cached rttvar updated */
  427         u_long  tcps_cachedssthresh;    /* times cached ssthresh updated */
  428         u_long  tcps_usedrtt;           /* times RTT initialized from route */
  429         u_long  tcps_usedrttvar;        /* times RTTVAR initialized from rt */
  430         u_long  tcps_usedssthresh;      /* times ssthresh initialized from rt*/
  431         u_long  tcps_persistdrop;       /* timeout in persist state */
  432         u_long  tcps_badsyn;            /* bogus SYN, e.g. premature ACK */
  433         u_long  tcps_mturesent;         /* resends due to MTU discovery */
  434         u_long  tcps_listendrop;        /* listen queue overflows */
  435         u_long  tcps_badrst;            /* ignored RSTs in the window */
  436 
  437         u_long  tcps_sc_added;          /* entry added to syncache */
  438         u_long  tcps_sc_retransmitted;  /* syncache entry was retransmitted */
  439         u_long  tcps_sc_dupsyn;         /* duplicate SYN packet */
  440         u_long  tcps_sc_dropped;        /* could not reply to packet */
  441         u_long  tcps_sc_completed;      /* successful extraction of entry */
  442         u_long  tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */
  443         u_long  tcps_sc_cacheoverflow;  /* syncache cache limit hit */
  444         u_long  tcps_sc_reset;          /* RST removed entry from syncache */
  445         u_long  tcps_sc_stale;          /* timed out or listen socket gone */
  446         u_long  tcps_sc_aborted;        /* syncache entry aborted */
  447         u_long  tcps_sc_badack;         /* removed due to bad ACK */
  448         u_long  tcps_sc_unreach;        /* ICMP unreachable received */
  449         u_long  tcps_sc_zonefail;       /* zalloc() failed */
  450         u_long  tcps_sc_sendcookie;     /* SYN cookie sent */
  451         u_long  tcps_sc_recvcookie;     /* SYN cookie received */
  452 
  453         u_long  tcps_hc_added;          /* entry added to hostcache */
  454         u_long  tcps_hc_bucketoverflow; /* hostcache per bucket limit hit */
  455 
  456         u_long  tcps_finwait2_drops;    /* Drop FIN_WAIT_2 connection after time limit */
  457 
  458         /* SACK related stats */
  459         u_long  tcps_sack_recovery_episode; /* SACK recovery episodes */
  460         u_long  tcps_sack_rexmits;          /* SACK rexmit segments   */
  461         u_long  tcps_sack_rexmit_bytes;     /* SACK rexmit bytes      */
  462         u_long  tcps_sack_rcv_blocks;       /* SACK blocks (options) received */
  463         u_long  tcps_sack_send_blocks;      /* SACK blocks (options) sent     */
  464         u_long  tcps_sack_sboverflow;       /* times scoreboard overflowed */
  465         
  466         /* ECN related stats */
  467         u_long  tcps_ecn_ce;            /* ECN Congestion Experienced */
  468         u_long  tcps_ecn_ect0;          /* ECN Capable Transport */
  469         u_long  tcps_ecn_ect1;          /* ECN Capable Transport */
  470         u_long  tcps_ecn_shs;           /* ECN successful handshakes */
  471         u_long  tcps_ecn_rcwnd;         /* # times ECN reduced the cwnd */
  472 
  473         u_long  _pad[12];               /* 6 UTO, 6 TBD */
  474 };
  475 
  476 #ifdef _KERNEL
  477 /*
  478  * In-kernel consumers can use these accessor macros directly to update
  479  * stats.
  480  */
  481 #define TCPSTAT_ADD(name, val)  V_tcpstat.name += (val)
  482 #define TCPSTAT_INC(name)       TCPSTAT_ADD(name, 1)
  483 
  484 /*
  485  * Kernel module consumers must use this accessor macro.
  486  */
  487 void    kmod_tcpstat_inc(int statnum);
  488 #define KMOD_TCPSTAT_INC(name)                                          \
  489         kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(u_long))
  490 #endif
  491 
  492 /*
  493  * TCB structure exported to user-land via sysctl(3).
  494  * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
  495  * included.  Not all of our clients do.
  496  */
  497 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
  498 struct  xtcpcb {
  499         size_t  xt_len;
  500         struct  inpcb   xt_inp;
  501         struct  tcpcb   xt_tp;
  502         struct  xsocket xt_socket;
  503         u_quad_t        xt_alignment_hack;
  504 };
  505 #endif
  506 
  507 /*
  508  * Names for TCP sysctl objects
  509  */
  510 #define TCPCTL_DO_RFC1323       1       /* use RFC-1323 extensions */
  511 #define TCPCTL_MSSDFLT          3       /* MSS default */
  512 #define TCPCTL_STATS            4       /* statistics (read-only) */
  513 #define TCPCTL_RTTDFLT          5       /* default RTT estimate */
  514 #define TCPCTL_KEEPIDLE         6       /* keepalive idle timer */
  515 #define TCPCTL_KEEPINTVL        7       /* interval to send keepalives */
  516 #define TCPCTL_SENDSPACE        8       /* send buffer space */
  517 #define TCPCTL_RECVSPACE        9       /* receive buffer space */
  518 #define TCPCTL_KEEPINIT         10      /* timeout for establishing syn */
  519 #define TCPCTL_PCBLIST          11      /* list of all outstanding PCBs */
  520 #define TCPCTL_DELACKTIME       12      /* time before sending delayed ACK */
  521 #define TCPCTL_V6MSSDFLT        13      /* MSS default for IPv6 */
  522 #define TCPCTL_SACK             14      /* Selective Acknowledgement,rfc 2018 */
  523 #define TCPCTL_DROP             15      /* drop tcp connection */
  524 #define TCPCTL_MAXID            16
  525 #define TCPCTL_FINWAIT2_TIMEOUT        17
  526 
  527 #define TCPCTL_NAMES { \
  528         { 0, 0 }, \
  529         { "rfc1323", CTLTYPE_INT }, \
  530         { "mssdflt", CTLTYPE_INT }, \
  531         { "stats", CTLTYPE_STRUCT }, \
  532         { "rttdflt", CTLTYPE_INT }, \
  533         { "keepidle", CTLTYPE_INT }, \
  534         { "keepintvl", CTLTYPE_INT }, \
  535         { "sendspace", CTLTYPE_INT }, \
  536         { "recvspace", CTLTYPE_INT }, \
  537         { "keepinit", CTLTYPE_INT }, \
  538         { "pcblist", CTLTYPE_STRUCT }, \
  539         { "delacktime", CTLTYPE_INT }, \
  540         { "v6mssdflt", CTLTYPE_INT }, \
  541         { "maxid", CTLTYPE_INT }, \
  542 }
  543 
  544 
  545 #ifdef _KERNEL
  546 #ifdef SYSCTL_DECL
  547 SYSCTL_DECL(_net_inet_tcp);
  548 SYSCTL_DECL(_net_inet_tcp_sack);
  549 MALLOC_DECLARE(M_TCPLOG);
  550 #endif
  551 
  552 extern  int tcp_log_in_vain;
  553 
  554 VNET_DECLARE(struct inpcbhead, tcb);            /* queue of active tcpcb's */
  555 VNET_DECLARE(struct inpcbinfo, tcbinfo);
  556 VNET_DECLARE(struct tcpstat, tcpstat);          /* tcp statistics */
  557 VNET_DECLARE(int, tcp_mssdflt); /* XXX */
  558 VNET_DECLARE(int, tcp_minmss);
  559 VNET_DECLARE(int, tcp_delack_enabled);
  560 VNET_DECLARE(int, tcp_do_newreno);
  561 VNET_DECLARE(int, path_mtu_discovery);
  562 VNET_DECLARE(int, ss_fltsz);
  563 VNET_DECLARE(int, ss_fltsz_local);
  564 
  565 #define V_tcb                   VNET(tcb)
  566 #define V_tcbinfo               VNET(tcbinfo)
  567 #define V_tcpstat               VNET(tcpstat)
  568 #define V_tcp_mssdflt           VNET(tcp_mssdflt)
  569 #define V_tcp_minmss            VNET(tcp_minmss)
  570 #define V_tcp_delack_enabled    VNET(tcp_delack_enabled)
  571 #define V_tcp_do_newreno        VNET(tcp_do_newreno)
  572 #define V_path_mtu_discovery    VNET(path_mtu_discovery)
  573 #define V_ss_fltsz              VNET(ss_fltsz)
  574 #define V_ss_fltsz_local        VNET(ss_fltsz_local)
  575 
  576 VNET_DECLARE(int, blackhole);
  577 VNET_DECLARE(int, drop_synfin);
  578 VNET_DECLARE(int, tcp_do_rfc3042);
  579 VNET_DECLARE(int, tcp_do_rfc3390);
  580 VNET_DECLARE(int, tcp_insecure_rst);
  581 VNET_DECLARE(int, tcp_do_autorcvbuf);
  582 VNET_DECLARE(int, tcp_autorcvbuf_inc);
  583 VNET_DECLARE(int, tcp_autorcvbuf_max);
  584 VNET_DECLARE(int, tcp_do_rfc3465);
  585 VNET_DECLARE(int, tcp_abc_l_var);
  586 
  587 #define V_blackhole             VNET(blackhole)
  588 #define V_drop_synfin           VNET(drop_synfin)
  589 #define V_tcp_do_rfc3042        VNET(tcp_do_rfc3042)
  590 #define V_tcp_do_rfc3390        VNET(tcp_do_rfc3390)
  591 #define V_tcp_insecure_rst      VNET(tcp_insecure_rst)
  592 #define V_tcp_do_autorcvbuf     VNET(tcp_do_autorcvbuf)
  593 #define V_tcp_autorcvbuf_inc    VNET(tcp_autorcvbuf_inc)
  594 #define V_tcp_autorcvbuf_max    VNET(tcp_autorcvbuf_max)
  595 #define V_tcp_do_rfc3465        VNET(tcp_do_rfc3465)
  596 #define V_tcp_abc_l_var         VNET(tcp_abc_l_var)
  597 
  598 VNET_DECLARE(int, tcp_do_tso);
  599 VNET_DECLARE(int, tcp_do_autosndbuf);
  600 VNET_DECLARE(int, tcp_autosndbuf_inc);
  601 VNET_DECLARE(int, tcp_autosndbuf_max);
  602 
  603 #define V_tcp_do_tso            VNET(tcp_do_tso)
  604 #define V_tcp_do_autosndbuf     VNET(tcp_do_autosndbuf)
  605 #define V_tcp_autosndbuf_inc    VNET(tcp_autosndbuf_inc)
  606 #define V_tcp_autosndbuf_max    VNET(tcp_autosndbuf_max)
  607 
  608 VNET_DECLARE(int, nolocaltimewait);
  609 
  610 #define V_nolocaltimewait       VNET(nolocaltimewait)
  611 
  612 VNET_DECLARE(int, tcp_do_sack);                 /* SACK enabled/disabled */
  613 VNET_DECLARE(int, tcp_sack_maxholes);
  614 VNET_DECLARE(int, tcp_sack_globalmaxholes);
  615 VNET_DECLARE(int, tcp_sack_globalholes);
  616 VNET_DECLARE(int, tcp_sc_rst_sock_fail);        /* RST on sock alloc failure */
  617 VNET_DECLARE(int, tcp_do_ecn);                  /* TCP ECN enabled/disabled */
  618 VNET_DECLARE(int, tcp_ecn_maxretries);
  619 
  620 #define V_tcp_do_sack           VNET(tcp_do_sack)
  621 #define V_tcp_sack_maxholes     VNET(tcp_sack_maxholes)
  622 #define V_tcp_sack_globalmaxholes       VNET(tcp_sack_globalmaxholes)
  623 #define V_tcp_sack_globalholes  VNET(tcp_sack_globalholes)
  624 #define V_tcp_sc_rst_sock_fail  VNET(tcp_sc_rst_sock_fail)
  625 #define V_tcp_do_ecn            VNET(tcp_do_ecn)
  626 #define V_tcp_ecn_maxretries    VNET(tcp_ecn_maxretries)
  627 
  628 int      tcp_addoptions(struct tcpopt *, u_char *);
  629 struct tcpcb *
  630          tcp_close(struct tcpcb *);
  631 void     tcp_discardcb(struct tcpcb *);
  632 void     tcp_twstart(struct tcpcb *);
  633 #if 0
  634 int      tcp_twrecycleable(struct tcptw *tw);
  635 #endif
  636 void     tcp_twclose(struct tcptw *_tw, int _reuse);
  637 void     tcp_ctlinput(int, struct sockaddr *, void *);
  638 int      tcp_ctloutput(struct socket *, struct sockopt *);
  639 struct tcpcb *
  640          tcp_drop(struct tcpcb *, int);
  641 void     tcp_drain(void);
  642 void     tcp_fasttimo(void);
  643 void     tcp_init(void);
  644 #ifdef VIMAGE
  645 void     tcp_destroy(void);
  646 #endif
  647 void     tcp_fini(void *);
  648 char    *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *,
  649             const void *);
  650 int      tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *);
  651 void     tcp_reass_init(void);
  652 void     tcp_input(struct mbuf *, int);
  653 u_long   tcp_maxmtu(struct in_conninfo *, int *);
  654 u_long   tcp_maxmtu6(struct in_conninfo *, int *);
  655 void     tcp_mss_update(struct tcpcb *, int, struct hc_metrics_lite *, int *);
  656 void     tcp_mss(struct tcpcb *, int);
  657 int      tcp_mssopt(struct in_conninfo *);
  658 struct inpcb *
  659          tcp_drop_syn_sent(struct inpcb *, int);
  660 struct inpcb *
  661          tcp_mtudisc(struct inpcb *, int);
  662 struct tcpcb *
  663          tcp_newtcpcb(struct inpcb *);
  664 int      tcp_output(struct tcpcb *);
  665 void     tcp_respond(struct tcpcb *, void *,
  666             struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
  667 void     tcp_tw_init(void);
  668 #ifdef VIMAGE
  669 void     tcp_tw_destroy(void);
  670 #endif
  671 void     tcp_tw_zone_change(void);
  672 int      tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *,
  673             struct mbuf *, int);
  674 int      tcp_twrespond(struct tcptw *, int);
  675 void     tcp_setpersist(struct tcpcb *);
  676 #ifdef TCP_SIGNATURE
  677 int      tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int);
  678 #endif
  679 void     tcp_slowtimo(void);
  680 struct tcptemp *
  681          tcpip_maketemplate(struct inpcb *);
  682 void     tcpip_fillheaders(struct inpcb *, void *, void *);
  683 void     tcp_timer_activate(struct tcpcb *, int, u_int);
  684 int      tcp_timer_active(struct tcpcb *, int);
  685 void     tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int);
  686 void     tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq);
  687 /*
  688  * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo)
  689  */
  690 void     tcp_hc_init(void);
  691 #ifdef VIMAGE
  692 void     tcp_hc_destroy(void);
  693 #endif
  694 void     tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *);
  695 u_long   tcp_hc_getmtu(struct in_conninfo *);
  696 void     tcp_hc_updatemtu(struct in_conninfo *, u_long);
  697 void     tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *);
  698 
  699 extern  struct pr_usrreqs tcp_usrreqs;
  700 extern  u_long tcp_sendspace;
  701 extern  u_long tcp_recvspace;
  702 tcp_seq tcp_new_isn(struct tcpcb *);
  703 
  704 void     tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq);
  705 void     tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
  706 void     tcp_clean_sackreport(struct tcpcb *tp);
  707 void     tcp_sack_adjust(struct tcpcb *tp);
  708 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt);
  709 void     tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
  710 void     tcp_free_sackholes(struct tcpcb *tp);
  711 int      tcp_newreno(struct tcpcb *, struct tcphdr *);
  712 u_long   tcp_seq_subtract(u_long, u_long );
  713 
  714 #endif /* _KERNEL */
  715 
  716 #endif /* _NETINET_TCP_VAR_H_ */

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