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  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)tcp_var.h   8.4 (Berkeley) 5/24/95
   34  * $FreeBSD: releng/5.0/sys/netinet/tcp_var.h 102017 2002-08-17 18:26:02Z dillon $
   35  */
   36 
   37 #ifndef _NETINET_TCP_VAR_H_
   38 #define _NETINET_TCP_VAR_H_
   39 
   40 #include <netinet/in_pcb.h>             /* needed for in_conninfo, inp_gen_t */
   41 #include <netinet/tcp.h>
   42 
   43 /*
   44  * Kernel variables for tcp.
   45  */
   46 extern int      tcp_do_rfc1323;
   47 extern int      tcp_do_rfc1644;
   48 
   49 /* TCP segment queue entry */
   50 struct tseg_qent {
   51         LIST_ENTRY(tseg_qent) tqe_q;
   52         int     tqe_len;                /* TCP segment data length */
   53         struct  tcphdr *tqe_th;         /* a pointer to tcp header */
   54         struct  mbuf    *tqe_m;         /* mbuf contains packet */
   55 };
   56 LIST_HEAD(tsegqe_head, tseg_qent);
   57 #ifdef MALLOC_DECLARE
   58 MALLOC_DECLARE(M_TSEGQ);
   59 #endif
   60 
   61 struct tcptemp {
   62         u_char  tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
   63         struct  tcphdr tt_t;
   64 };
   65 
   66 #define tcp6cb          tcpcb  /* for KAME src sync over BSD*'s */
   67 
   68 /*
   69  * Tcp control block, one per tcp; fields:
   70  * Organized for 16 byte cacheline efficiency.
   71  */
   72 struct tcpcb {
   73         struct  tsegqe_head t_segq;
   74         int     t_dupacks;              /* consecutive dup acks recd */
   75         struct  tcptemp *unused;        /* unused */
   76 
   77         struct  callout *tt_rexmt;      /* retransmit timer */
   78         struct  callout *tt_persist;    /* retransmit persistence */
   79         struct  callout *tt_keep;       /* keepalive */
   80         struct  callout *tt_2msl;       /* 2*msl TIME_WAIT timer */
   81         struct  callout *tt_delack;     /* delayed ACK timer */
   82 
   83         struct  inpcb *t_inpcb;         /* back pointer to internet pcb */
   84         int     t_state;                /* state of this connection */
   85         u_int   t_flags;
   86 #define TF_ACKNOW       0x00001         /* ack peer immediately */
   87 #define TF_DELACK       0x00002         /* ack, but try to delay it */
   88 #define TF_NODELAY      0x00004         /* don't delay packets to coalesce */
   89 #define TF_NOOPT        0x00008         /* don't use tcp options */
   90 #define TF_SENTFIN      0x00010         /* have sent FIN */
   91 #define TF_REQ_SCALE    0x00020         /* have/will request window scaling */
   92 #define TF_RCVD_SCALE   0x00040         /* other side has requested scaling */
   93 #define TF_REQ_TSTMP    0x00080         /* have/will request timestamps */
   94 #define TF_RCVD_TSTMP   0x00100         /* a timestamp was received in SYN */
   95 #define TF_SACK_PERMIT  0x00200         /* other side said I could SACK */
   96 #define TF_NEEDSYN      0x00400         /* send SYN (implicit state) */
   97 #define TF_NEEDFIN      0x00800         /* send FIN (implicit state) */
   98 #define TF_NOPUSH       0x01000         /* don't push */
   99 #define TF_REQ_CC       0x02000         /* have/will request CC */
  100 #define TF_RCVD_CC      0x04000         /* a CC was received in SYN */
  101 #define TF_SENDCCNEW    0x08000         /* send CCnew instead of CC in SYN */
  102 #define TF_MORETOCOME   0x10000         /* More data to be appended to sock */
  103 #define TF_LQ_OVERFLOW  0x20000         /* listen queue overflow */
  104 #define TF_LASTIDLE     0x40000         /* connection was previously idle */
  105 #define TF_RXWIN0SENT   0x80000         /* sent a receiver win 0 in response */
  106         int     t_force;                /* 1 if forcing out a byte */
  107 
  108         tcp_seq snd_una;                /* send unacknowledged */
  109         tcp_seq snd_max;                /* highest sequence number sent;
  110                                          * used to recognize retransmits
  111                                          */
  112         tcp_seq snd_nxt;                /* send next */
  113         tcp_seq snd_up;                 /* send urgent pointer */
  114 
  115         tcp_seq snd_wl1;                /* window update seg seq number */
  116         tcp_seq snd_wl2;                /* window update seg ack number */
  117         tcp_seq iss;                    /* initial send sequence number */
  118         tcp_seq irs;                    /* initial receive sequence number */
  119 
  120         tcp_seq rcv_nxt;                /* receive next */
  121         tcp_seq rcv_adv;                /* advertised window */
  122         u_long  rcv_wnd;                /* receive window */
  123         tcp_seq rcv_up;                 /* receive urgent pointer */
  124 
  125         u_long  snd_wnd;                /* send window */
  126         u_long  snd_cwnd;               /* congestion-controlled window */
  127         u_long  snd_bwnd;               /* bandwidth-controlled window */
  128         u_long  snd_ssthresh;           /* snd_cwnd size threshold for
  129                                          * for slow start exponential to
  130                                          * linear switch
  131                                          */
  132         u_long  snd_bandwidth;          /* calculated bandwidth or 0 */
  133         tcp_seq snd_recover;            /* for use in fast recovery */
  134 
  135         u_int   t_maxopd;               /* mss plus options */
  136 
  137         u_long  t_rcvtime;              /* inactivity time */
  138         u_long  t_starttime;            /* time connection was established */
  139         int     t_rtttime;              /* round trip time */
  140         tcp_seq t_rtseq;                /* sequence number being timed */
  141 
  142         int     t_bw_rtttime;           /* used for bandwidth calculation */
  143         tcp_seq t_bw_rtseq;             /* used for bandwidth calculation */
  144 
  145         int     t_rxtcur;               /* current retransmit value (ticks) */
  146         u_int   t_maxseg;               /* maximum segment size */
  147         int     t_srtt;                 /* smoothed round-trip time */
  148         int     t_rttvar;               /* variance in round-trip time */
  149 
  150         int     t_rxtshift;             /* log(2) of rexmt exp. backoff */
  151         u_int   t_rttmin;               /* minimum rtt allowed */
  152         u_int   t_rttbest;              /* best rtt we've seen */
  153         u_long  t_rttupdated;           /* number of times rtt sampled */
  154         u_long  max_sndwnd;             /* largest window peer has offered */
  155 
  156         int     t_softerror;            /* possible error not yet reported */
  157 /* out-of-band data */
  158         char    t_oobflags;             /* have some */
  159         char    t_iobc;                 /* input character */
  160 #define TCPOOB_HAVEDATA 0x01
  161 #define TCPOOB_HADDATA  0x02
  162 /* RFC 1323 variables */
  163         u_char  snd_scale;              /* window scaling for send window */
  164         u_char  rcv_scale;              /* window scaling for recv window */
  165         u_char  request_r_scale;        /* pending window scaling */
  166         u_char  requested_s_scale;
  167         u_long  ts_recent;              /* timestamp echo data */
  168 
  169         u_long  ts_recent_age;          /* when last updated */
  170         tcp_seq last_ack_sent;
  171 /* RFC 1644 variables */
  172         tcp_cc  cc_send;                /* send connection count */
  173         tcp_cc  cc_recv;                /* receive connection count */
  174 /* experimental */
  175         u_long  snd_cwnd_prev;          /* cwnd prior to retransmit */
  176         u_long  snd_ssthresh_prev;      /* ssthresh prior to retransmit */
  177         u_long  t_badrxtwin;            /* window for retransmit recovery */
  178 };
  179 
  180 /*
  181  * Structure to hold TCP options that are only used during segment
  182  * processing (in tcp_input), but not held in the tcpcb.
  183  * It's basically used to reduce the number of parameters
  184  * to tcp_dooptions.
  185  */
  186 struct tcpopt {
  187         u_long          to_flags;       /* which options are present */
  188 #define TOF_TS          0x0001          /* timestamp */
  189 #define TOF_CC          0x0002          /* CC and CCnew are exclusive */
  190 #define TOF_CCNEW       0x0004
  191 #define TOF_CCECHO      0x0008
  192 #define TOF_MSS         0x0010
  193 #define TOF_SCALE       0x0020
  194         u_int32_t       to_tsval;
  195         u_int32_t       to_tsecr;
  196         tcp_cc          to_cc;          /* holds CC or CCnew */
  197         tcp_cc          to_ccecho;
  198         u_int16_t       to_mss;
  199         u_int8_t        to_requested_s_scale;
  200         u_int8_t        to_pad;
  201 };
  202 
  203 struct syncache {
  204         inp_gen_t       sc_inp_gencnt;          /* pointer check */
  205         struct          tcpcb *sc_tp;           /* tcb for listening socket */
  206         struct          mbuf *sc_ipopts;        /* source route */
  207         struct          in_conninfo sc_inc;     /* addresses */
  208 #define sc_route        sc_inc.inc_route
  209 #define sc_route6       sc_inc.inc6_route
  210         u_int32_t       sc_tsrecent;
  211         tcp_cc          sc_cc_send;             /* holds CC or CCnew */
  212         tcp_cc          sc_cc_recv;
  213         tcp_seq         sc_irs;                 /* seq from peer */
  214         tcp_seq         sc_iss;                 /* our ISS */
  215         u_long          sc_rxttime;             /* retransmit time */
  216         u_int16_t       sc_rxtslot;             /* retransmit counter */
  217         u_int16_t       sc_peer_mss;            /* peer's MSS */
  218         u_int16_t       sc_wnd;                 /* advertised window */
  219         u_int8_t        sc_requested_s_scale:4,
  220                         sc_request_r_scale:4;
  221         u_int8_t        sc_flags;
  222 #define SCF_NOOPT       0x01                    /* no TCP options */
  223 #define SCF_WINSCALE    0x02                    /* negotiated window scaling */
  224 #define SCF_TIMESTAMP   0x04                    /* negotiated timestamps */
  225 #define SCF_CC          0x08                    /* negotiated CC */
  226 #define SCF_UNREACH     0x10                    /* icmp unreachable received */
  227 #define SCF_KEEPROUTE   0x20                    /* keep cloned route */
  228         TAILQ_ENTRY(syncache)   sc_hash;
  229         TAILQ_ENTRY(syncache)   sc_timerq;
  230 };
  231 
  232 struct syncache_head {
  233         TAILQ_HEAD(, syncache)  sch_bucket;
  234         u_int           sch_length;
  235 };
  236  
  237 /*
  238  * The TAO cache entry which is stored in the protocol family specific
  239  * portion of the route metrics.
  240  */
  241 struct rmxp_tao {
  242         tcp_cc  tao_cc;                 /* latest CC in valid SYN */
  243         tcp_cc  tao_ccsent;             /* latest CC sent to peer */
  244         u_short tao_mssopt;             /* peer's cached MSS */
  245 #ifdef notyet
  246         u_short tao_flags;              /* cache status flags */
  247 #define TAOF_DONT       0x0001          /* peer doesn't understand rfc1644 */
  248 #define TAOF_OK         0x0002          /* peer does understand rfc1644 */
  249 #define TAOF_UNDEF      0               /* we don't know yet */
  250 #endif /* notyet */
  251 };
  252 #define rmx_taop(r)     ((struct rmxp_tao *)(r).rmx_filler)
  253 
  254 #define intotcpcb(ip)   ((struct tcpcb *)(ip)->inp_ppcb)
  255 #define sototcpcb(so)   (intotcpcb(sotoinpcb(so)))
  256 
  257 /*
  258  * The smoothed round-trip time and estimated variance
  259  * are stored as fixed point numbers scaled by the values below.
  260  * For convenience, these scales are also used in smoothing the average
  261  * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
  262  * With these scales, srtt has 3 bits to the right of the binary point,
  263  * and thus an "ALPHA" of 0.875.  rttvar has 2 bits to the right of the
  264  * binary point, and is smoothed with an ALPHA of 0.75.
  265  */
  266 #define TCP_RTT_SCALE           32      /* multiplier for srtt; 3 bits frac. */
  267 #define TCP_RTT_SHIFT           5       /* shift for srtt; 3 bits frac. */
  268 #define TCP_RTTVAR_SCALE        16      /* multiplier for rttvar; 2 bits */
  269 #define TCP_RTTVAR_SHIFT        4       /* shift for rttvar; 2 bits */
  270 #define TCP_DELTA_SHIFT         2       /* see tcp_input.c */
  271 
  272 /*
  273  * The initial retransmission should happen at rtt + 4 * rttvar.
  274  * Because of the way we do the smoothing, srtt and rttvar
  275  * will each average +1/2 tick of bias.  When we compute
  276  * the retransmit timer, we want 1/2 tick of rounding and
  277  * 1 extra tick because of +-1/2 tick uncertainty in the
  278  * firing of the timer.  The bias will give us exactly the
  279  * 1.5 tick we need.  But, because the bias is
  280  * statistical, we have to test that we don't drop below
  281  * the minimum feasible timer (which is 2 ticks).
  282  * This version of the macro adapted from a paper by Lawrence
  283  * Brakmo and Larry Peterson which outlines a problem caused
  284  * by insufficient precision in the original implementation,
  285  * which results in inappropriately large RTO values for very
  286  * fast networks.
  287  */
  288 #define TCP_REXMTVAL(tp) \
  289         max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT))  \
  290           + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
  291 
  292 /*
  293  * TCP statistics.
  294  * Many of these should be kept per connection,
  295  * but that's inconvenient at the moment.
  296  */
  297 struct  tcpstat {
  298         u_long  tcps_connattempt;       /* connections initiated */
  299         u_long  tcps_accepts;           /* connections accepted */
  300         u_long  tcps_connects;          /* connections established */
  301         u_long  tcps_drops;             /* connections dropped */
  302         u_long  tcps_conndrops;         /* embryonic connections dropped */
  303         u_long  tcps_closed;            /* conn. closed (includes drops) */
  304         u_long  tcps_segstimed;         /* segs where we tried to get rtt */
  305         u_long  tcps_rttupdated;        /* times we succeeded */
  306         u_long  tcps_delack;            /* delayed acks sent */
  307         u_long  tcps_timeoutdrop;       /* conn. dropped in rxmt timeout */
  308         u_long  tcps_rexmttimeo;        /* retransmit timeouts */
  309         u_long  tcps_persisttimeo;      /* persist timeouts */
  310         u_long  tcps_keeptimeo;         /* keepalive timeouts */
  311         u_long  tcps_keepprobe;         /* keepalive probes sent */
  312         u_long  tcps_keepdrops;         /* connections dropped in keepalive */
  313 
  314         u_long  tcps_sndtotal;          /* total packets sent */
  315         u_long  tcps_sndpack;           /* data packets sent */
  316         u_long  tcps_sndbyte;           /* data bytes sent */
  317         u_long  tcps_sndrexmitpack;     /* data packets retransmitted */
  318         u_long  tcps_sndrexmitbyte;     /* data bytes retransmitted */
  319         u_long  tcps_sndrexmitbad;      /* unnecessary packet retransmissions */
  320         u_long  tcps_sndacks;           /* ack-only packets sent */
  321         u_long  tcps_sndprobe;          /* window probes sent */
  322         u_long  tcps_sndurg;            /* packets sent with URG only */
  323         u_long  tcps_sndwinup;          /* window update-only packets sent */
  324         u_long  tcps_sndctrl;           /* control (SYN|FIN|RST) packets sent */
  325 
  326         u_long  tcps_rcvtotal;          /* total packets received */
  327         u_long  tcps_rcvpack;           /* packets received in sequence */
  328         u_long  tcps_rcvbyte;           /* bytes received in sequence */
  329         u_long  tcps_rcvbadsum;         /* packets received with ccksum errs */
  330         u_long  tcps_rcvbadoff;         /* packets received with bad offset */
  331         u_long  tcps_rcvmemdrop;        /* packets dropped for lack of memory */
  332         u_long  tcps_rcvshort;          /* packets received too short */
  333         u_long  tcps_rcvduppack;        /* duplicate-only packets received */
  334         u_long  tcps_rcvdupbyte;        /* duplicate-only bytes received */
  335         u_long  tcps_rcvpartduppack;    /* packets with some duplicate data */
  336         u_long  tcps_rcvpartdupbyte;    /* dup. bytes in part-dup. packets */
  337         u_long  tcps_rcvoopack;         /* out-of-order packets received */
  338         u_long  tcps_rcvoobyte;         /* out-of-order bytes received */
  339         u_long  tcps_rcvpackafterwin;   /* packets with data after window */
  340         u_long  tcps_rcvbyteafterwin;   /* bytes rcvd after window */
  341         u_long  tcps_rcvafterclose;     /* packets rcvd after "close" */
  342         u_long  tcps_rcvwinprobe;       /* rcvd window probe packets */
  343         u_long  tcps_rcvdupack;         /* rcvd duplicate acks */
  344         u_long  tcps_rcvacktoomuch;     /* rcvd acks for unsent data */
  345         u_long  tcps_rcvackpack;        /* rcvd ack packets */
  346         u_long  tcps_rcvackbyte;        /* bytes acked by rcvd acks */
  347         u_long  tcps_rcvwinupd;         /* rcvd window update packets */
  348         u_long  tcps_pawsdrop;          /* segments dropped due to PAWS */
  349         u_long  tcps_predack;           /* times hdr predict ok for acks */
  350         u_long  tcps_preddat;           /* times hdr predict ok for data pkts */
  351         u_long  tcps_pcbcachemiss;
  352         u_long  tcps_cachedrtt;         /* times cached RTT in route updated */
  353         u_long  tcps_cachedrttvar;      /* times cached rttvar updated */
  354         u_long  tcps_cachedssthresh;    /* times cached ssthresh updated */
  355         u_long  tcps_usedrtt;           /* times RTT initialized from route */
  356         u_long  tcps_usedrttvar;        /* times RTTVAR initialized from rt */
  357         u_long  tcps_usedssthresh;      /* times ssthresh initialized from rt*/
  358         u_long  tcps_persistdrop;       /* timeout in persist state */
  359         u_long  tcps_badsyn;            /* bogus SYN, e.g. premature ACK */
  360         u_long  tcps_mturesent;         /* resends due to MTU discovery */
  361         u_long  tcps_listendrop;        /* listen queue overflows */
  362 
  363         u_long  tcps_sc_added;          /* entry added to syncache */
  364         u_long  tcps_sc_retransmitted;  /* syncache entry was retransmitted */
  365         u_long  tcps_sc_dupsyn;         /* duplicate SYN packet */
  366         u_long  tcps_sc_dropped;        /* could not reply to packet */
  367         u_long  tcps_sc_completed;      /* successful extraction of entry */
  368         u_long  tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */
  369         u_long  tcps_sc_cacheoverflow;  /* syncache cache limit hit */
  370         u_long  tcps_sc_reset;          /* RST removed entry from syncache */
  371         u_long  tcps_sc_stale;          /* timed out or listen socket gone */
  372         u_long  tcps_sc_aborted;        /* syncache entry aborted */
  373         u_long  tcps_sc_badack;         /* removed due to bad ACK */
  374         u_long  tcps_sc_unreach;        /* ICMP unreachable received */
  375         u_long  tcps_sc_zonefail;       /* zalloc() failed */
  376         u_long  tcps_sc_sendcookie;     /* SYN cookie sent */
  377         u_long  tcps_sc_recvcookie;     /* SYN cookie received */
  378 };
  379 
  380 /*
  381  * TCB structure exported to user-land via sysctl(3).
  382  * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
  383  * included.  Not all of our clients do.
  384  */
  385 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
  386 struct  xtcpcb {
  387         size_t  xt_len;
  388         struct  inpcb   xt_inp;
  389         struct  tcpcb   xt_tp;
  390         struct  xsocket xt_socket;
  391         u_quad_t        xt_alignment_hack;
  392 };
  393 #endif
  394 
  395 /*
  396  * Names for TCP sysctl objects
  397  */
  398 #define TCPCTL_DO_RFC1323       1       /* use RFC-1323 extensions */
  399 #define TCPCTL_DO_RFC1644       2       /* use RFC-1644 extensions */
  400 #define TCPCTL_MSSDFLT          3       /* MSS default */
  401 #define TCPCTL_STATS            4       /* statistics (read-only) */
  402 #define TCPCTL_RTTDFLT          5       /* default RTT estimate */
  403 #define TCPCTL_KEEPIDLE         6       /* keepalive idle timer */
  404 #define TCPCTL_KEEPINTVL        7       /* interval to send keepalives */
  405 #define TCPCTL_SENDSPACE        8       /* send buffer space */
  406 #define TCPCTL_RECVSPACE        9       /* receive buffer space */
  407 #define TCPCTL_KEEPINIT         10      /* timeout for establishing syn */
  408 #define TCPCTL_PCBLIST          11      /* list of all outstanding PCBs */
  409 #define TCPCTL_DELACKTIME       12      /* time before sending delayed ACK */
  410 #define TCPCTL_V6MSSDFLT        13      /* MSS default for IPv6 */
  411 #define TCPCTL_MAXID            14
  412 
  413 #define TCPCTL_NAMES { \
  414         { 0, 0 }, \
  415         { "rfc1323", CTLTYPE_INT }, \
  416         { "rfc1644", CTLTYPE_INT }, \
  417         { "mssdflt", CTLTYPE_INT }, \
  418         { "stats", CTLTYPE_STRUCT }, \
  419         { "rttdflt", CTLTYPE_INT }, \
  420         { "keepidle", CTLTYPE_INT }, \
  421         { "keepintvl", CTLTYPE_INT }, \
  422         { "sendspace", CTLTYPE_INT }, \
  423         { "recvspace", CTLTYPE_INT }, \
  424         { "keepinit", CTLTYPE_INT }, \
  425         { "pcblist", CTLTYPE_STRUCT }, \
  426         { "delacktime", CTLTYPE_INT }, \
  427         { "v6mssdflt", CTLTYPE_INT }, \
  428 }
  429 
  430 
  431 #ifdef _KERNEL
  432 #ifdef SYSCTL_DECL
  433 SYSCTL_DECL(_net_inet_tcp);
  434 #endif
  435 
  436 extern  struct inpcbhead tcb;           /* head of queue of active tcpcb's */
  437 extern  struct inpcbinfo tcbinfo;
  438 extern  struct tcpstat tcpstat; /* tcp statistics */
  439 extern  int tcp_mssdflt;        /* XXX */
  440 extern  int tcp_delack_enabled;
  441 extern  int tcp_do_newreno;
  442 extern  int path_mtu_discovery;
  443 extern  int ss_fltsz;
  444 extern  int ss_fltsz_local;
  445 
  446 void     tcp_canceltimers(struct tcpcb *);
  447 struct tcpcb *
  448          tcp_close(struct tcpcb *);
  449 void     tcp_ctlinput(int, struct sockaddr *, void *);
  450 int      tcp_ctloutput(struct socket *, struct sockopt *);
  451 struct tcpcb *
  452          tcp_drop(struct tcpcb *, int);
  453 void     tcp_drain(void);
  454 void     tcp_fasttimo(void);
  455 struct rmxp_tao *
  456          tcp_gettaocache(struct in_conninfo *);
  457 void     tcp_init(void);
  458 void     tcp_input(struct mbuf *, int);
  459 void     tcp_mss(struct tcpcb *, int);
  460 int      tcp_mssopt(struct tcpcb *);
  461 struct inpcb *   
  462          tcp_drop_syn_sent(struct inpcb *, int);
  463 struct inpcb *
  464          tcp_mtudisc(struct inpcb *, int);
  465 struct tcpcb *
  466          tcp_newtcpcb(struct inpcb *);
  467 int      tcp_output(struct tcpcb *);
  468 struct inpcb *
  469          tcp_quench(struct inpcb *, int);
  470 void     tcp_respond(struct tcpcb *, void *,
  471             struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
  472 struct rtentry *
  473          tcp_rtlookup(struct in_conninfo *);
  474 void     tcp_setpersist(struct tcpcb *);
  475 void     tcp_slowtimo(void);
  476 struct tcptemp *
  477          tcp_maketemplate(struct tcpcb *);
  478 void     tcp_fillheaders(struct tcpcb *, void *, void *);
  479 struct tcpcb *
  480          tcp_timers(struct tcpcb *, int);
  481 void     tcp_trace(int, int, struct tcpcb *, void *, struct tcphdr *, int);
  482 void     tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq);
  483 void     syncache_init(void);
  484 void     syncache_unreach(struct in_conninfo *, struct tcphdr *);
  485 int      syncache_expand(struct in_conninfo *, struct tcphdr *,
  486              struct socket **, struct mbuf *);
  487 int      syncache_add(struct in_conninfo *, struct tcpopt *,
  488              struct tcphdr *, struct socket **, struct mbuf *);
  489 void     syncache_chkrst(struct in_conninfo *, struct tcphdr *);
  490 void     syncache_badack(struct in_conninfo *);
  491 
  492 extern  struct pr_usrreqs tcp_usrreqs;
  493 extern  u_long tcp_sendspace;
  494 extern  u_long tcp_recvspace;
  495 tcp_seq tcp_new_isn(struct tcpcb *);
  496 
  497 #endif /* _KERNEL */
  498 
  499 #endif /* _NETINET_TCP_VAR_H_ */

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