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/8.2/sys/netinet/tcp_var.h 214860 2010-11-06 09:42:41Z lstewart $
   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 #define V_tcp_do_rfc1323        VNET(tcp_do_rfc1323)
   46 
   47 #endif /* _KERNEL */
   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 
   58 struct sackblk {
   59         tcp_seq start;          /* start seq no. of sack block */
   60         tcp_seq end;            /* end seq no. */
   61 };
   62 
   63 struct sackhole {
   64         tcp_seq start;          /* start seq no. of hole */
   65         tcp_seq end;            /* end seq no. */
   66         tcp_seq rxmit;          /* next seq. no in hole to be retransmitted */
   67         TAILQ_ENTRY(sackhole) scblink;  /* scoreboard linkage */
   68 };
   69 
   70 struct sackhint {
   71         struct sackhole *nexthole;
   72         int             sack_bytes_rexmit;
   73 
   74         int             ispare;         /* explicit pad for 64bit alignment */
   75         uint64_t        _pad[2];        /* 1 sacked_bytes, 1 TBD */
   76 };
   77 
   78 struct tcptemp {
   79         u_char  tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
   80         struct  tcphdr tt_t;
   81 };
   82 
   83 #define tcp6cb          tcpcb  /* for KAME src sync over BSD*'s */
   84 
   85 /* Neighbor Discovery, Neighbor Unreachability Detection Upper layer hint. */
   86 #ifdef INET6
   87 #define ND6_HINT(tp)                                            \
   88 do {                                                            \
   89         if ((tp) && (tp)->t_inpcb &&                            \
   90             ((tp)->t_inpcb->inp_vflag & INP_IPV6) != 0)         \
   91                 nd6_nud_hint(NULL, NULL, 0);                    \
   92 } while (0)
   93 #else
   94 #define ND6_HINT(tp)
   95 #endif
   96 
   97 /*
   98  * Tcp control block, one per tcp; fields:
   99  * Organized for 16 byte cacheline efficiency.
  100  */
  101 struct tcpcb {
  102         struct  tsegqe_head t_segq;     /* segment reassembly queue */
  103         void    *t_pspare[2];           /* new reassembly queue */
  104         int     t_segqlen;              /* segment reassembly queue length */
  105         int     t_dupacks;              /* consecutive dup acks recd */
  106 
  107         struct tcp_timer *t_timers;     /* All the TCP timers in one struct */
  108 
  109         struct  inpcb *t_inpcb;         /* back pointer to internet pcb */
  110         int     t_state;                /* state of this connection */
  111         u_int   t_flags;
  112 
  113         struct  vnet *t_vnet;           /* back pointer to parent vnet */
  114 
  115         tcp_seq snd_una;                /* send unacknowledged */
  116         tcp_seq snd_max;                /* highest sequence number sent;
  117                                          * used to recognize retransmits
  118                                          */
  119         tcp_seq snd_nxt;                /* send next */
  120         tcp_seq snd_up;                 /* send urgent pointer */
  121 
  122         tcp_seq snd_wl1;                /* window update seg seq number */
  123         tcp_seq snd_wl2;                /* window update seg ack number */
  124         tcp_seq iss;                    /* initial send sequence number */
  125         tcp_seq irs;                    /* initial receive sequence number */
  126 
  127         tcp_seq rcv_nxt;                /* receive next */
  128         tcp_seq rcv_adv;                /* advertised window */
  129         u_long  rcv_wnd;                /* receive window */
  130         tcp_seq rcv_up;                 /* receive urgent pointer */
  131 
  132         u_long  snd_wnd;                /* send window */
  133         u_long  snd_cwnd;               /* congestion-controlled window */
  134         u_long  snd_bwnd;               /* bandwidth-controlled window */
  135         u_long  snd_ssthresh;           /* snd_cwnd size threshold for
  136                                          * for slow start exponential to
  137                                          * linear switch
  138                                          */
  139         u_long  snd_bandwidth;          /* calculated bandwidth or 0 */
  140         tcp_seq snd_recover;            /* for use in NewReno Fast Recovery */
  141 
  142         u_int   t_maxopd;               /* mss plus options */
  143 
  144         u_int   t_rcvtime;              /* inactivity time */
  145         u_int   t_starttime;            /* time connection was established */
  146         u_int   t_rtttime;              /* RTT measurement start time */
  147         tcp_seq t_rtseq;                /* sequence number being timed */
  148 
  149         u_int   t_bw_rtttime;           /* used for bandwidth calculation */
  150         tcp_seq t_bw_rtseq;             /* used for bandwidth calculation */
  151 
  152         int     t_rxtcur;               /* current retransmit value (ticks) */
  153         u_int   t_maxseg;               /* maximum segment size */
  154         int     t_srtt;                 /* smoothed round-trip time */
  155         int     t_rttvar;               /* variance in round-trip time */
  156 
  157         int     t_rxtshift;             /* log(2) of rexmt exp. backoff */
  158         u_int   t_rttmin;               /* minimum rtt allowed */
  159         u_int   t_rttbest;              /* best rtt we've seen */
  160         u_long  t_rttupdated;           /* number of times rtt sampled */
  161         u_long  max_sndwnd;             /* largest window peer has offered */
  162 
  163         int     t_softerror;            /* possible error not yet reported */
  164 /* out-of-band data */
  165         char    t_oobflags;             /* have some */
  166         char    t_iobc;                 /* input character */
  167 /* RFC 1323 variables */
  168         u_char  snd_scale;              /* window scaling for send window */
  169         u_char  rcv_scale;              /* window scaling for recv window */
  170         u_char  request_r_scale;        /* pending window scaling */
  171         u_int32_t  ts_recent;           /* timestamp echo data */
  172         u_int   ts_recent_age;          /* when last updated */
  173         u_int32_t  ts_offset;           /* our timestamp offset */
  174 
  175         tcp_seq last_ack_sent;
  176 /* experimental */
  177         u_long  snd_cwnd_prev;          /* cwnd prior to retransmit */
  178         u_long  snd_ssthresh_prev;      /* ssthresh prior to retransmit */
  179         tcp_seq snd_recover_prev;       /* snd_recover prior to retransmit */
  180         u_int   t_badrxtwin;            /* window for retransmit recovery */
  181         u_char  snd_limited;            /* segments limited transmitted */
  182 /* SACK related state */
  183         int     snd_numholes;           /* number of holes seen by sender */
  184         TAILQ_HEAD(sackhole_head, sackhole) snd_holes;
  185                                         /* SACK scoreboard (sorted) */
  186         tcp_seq snd_fack;               /* last seq number(+1) sack'd by rcv'r*/
  187         int     rcv_numsacks;           /* # distinct sack blks present */
  188         struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
  189         tcp_seq sack_newdata;           /* New data xmitted in this recovery
  190                                            episode starts at this seq number */
  191         struct sackhint sackhint;       /* SACK scoreboard hint */
  192         int     t_rttlow;               /* smallest observerved RTT */
  193         u_int32_t       rfbuf_ts;       /* recv buffer autoscaling timestamp */
  194         int     rfbuf_cnt;              /* recv buffer autoscaling byte count */
  195         struct toe_usrreqs *t_tu;       /* offload operations vector */
  196         void    *t_toe;                 /* TOE pcb pointer */
  197         int     t_bytes_acked;          /* # bytes acked during current RTT */
  198 
  199         int     t_ispare;               /* explicit pad for 64bit alignment */
  200         void    *t_pspare2[6];          /* 2 CC / 4 TBD */
  201         uint64_t _pad[12];              /* 7 UTO, 5 TBD (1-2 CC/RTT?) */
  202 };
  203 
  204 /*
  205  * Flags and utility macros for the t_flags field.
  206  */
  207 #define TF_ACKNOW       0x000001        /* ack peer immediately */
  208 #define TF_DELACK       0x000002        /* ack, but try to delay it */
  209 #define TF_NODELAY      0x000004        /* don't delay packets to coalesce */
  210 #define TF_NOOPT        0x000008        /* don't use tcp options */
  211 #define TF_SENTFIN      0x000010        /* have sent FIN */
  212 #define TF_REQ_SCALE    0x000020        /* have/will request window scaling */
  213 #define TF_RCVD_SCALE   0x000040        /* other side has requested scaling */
  214 #define TF_REQ_TSTMP    0x000080        /* have/will request timestamps */
  215 #define TF_RCVD_TSTMP   0x000100        /* a timestamp was received in SYN */
  216 #define TF_SACK_PERMIT  0x000200        /* other side said I could SACK */
  217 #define TF_NEEDSYN      0x000400        /* send SYN (implicit state) */
  218 #define TF_NEEDFIN      0x000800        /* send FIN (implicit state) */
  219 #define TF_NOPUSH       0x001000        /* don't push */
  220 #define TF_MORETOCOME   0x010000        /* More data to be appended to sock */
  221 #define TF_LQ_OVERFLOW  0x020000        /* listen queue overflow */
  222 #define TF_LASTIDLE     0x040000        /* connection was previously idle */
  223 #define TF_RXWIN0SENT   0x080000        /* sent a receiver win 0 in response */
  224 #define TF_FASTRECOVERY 0x100000        /* in NewReno Fast Recovery */
  225 #define TF_WASFRECOVERY 0x200000        /* was in NewReno Fast Recovery */
  226 #define TF_SIGNATURE    0x400000        /* require MD5 digests (RFC2385) */
  227 #define TF_FORCEDATA    0x800000        /* force out a byte */
  228 #define TF_TSO          0x1000000       /* TSO enabled on this connection */
  229 #define TF_TOE          0x2000000       /* this connection is offloaded */
  230 #define TF_ECN_PERMIT   0x4000000       /* connection ECN-ready */
  231 #define TF_ECN_SND_CWR  0x8000000       /* ECN CWR in queue */
  232 #define TF_ECN_SND_ECE  0x10000000      /* ECN ECE in queue */
  233 
  234 #define IN_FASTRECOVERY(tp)     (tp->t_flags & TF_FASTRECOVERY)
  235 #define ENTER_FASTRECOVERY(tp)  tp->t_flags |= TF_FASTRECOVERY
  236 #define EXIT_FASTRECOVERY(tp)   tp->t_flags &= ~TF_FASTRECOVERY
  237 
  238 /*
  239  * Flags for the t_oobflags field.
  240  */
  241 #define TCPOOB_HAVEDATA 0x01
  242 #define TCPOOB_HADDATA  0x02
  243 
  244 #ifdef TCP_SIGNATURE
  245 /*
  246  * Defines which are needed by the xform_tcp module and tcp_[in|out]put
  247  * for SADB verification and lookup.
  248  */
  249 #define TCP_SIGLEN      16      /* length of computed digest in bytes */
  250 #define TCP_KEYLEN_MIN  1       /* minimum length of TCP-MD5 key */
  251 #define TCP_KEYLEN_MAX  80      /* maximum length of TCP-MD5 key */
  252 /*
  253  * Only a single SA per host may be specified at this time. An SPI is
  254  * needed in order for the KEY_ALLOCSA() lookup to work.
  255  */
  256 #define TCP_SIG_SPI     0x1000
  257 #endif /* TCP_SIGNATURE */
  258 
  259 /*
  260  * Structure to hold TCP options that are only used during segment
  261  * processing (in tcp_input), but not held in the tcpcb.
  262  * It's basically used to reduce the number of parameters
  263  * to tcp_dooptions and tcp_addoptions.
  264  * The binary order of the to_flags is relevant for packing of the
  265  * options in tcp_addoptions.
  266  */
  267 struct tcpopt {
  268         u_int64_t       to_flags;       /* which options are present */
  269 #define TOF_MSS         0x0001          /* maximum segment size */
  270 #define TOF_SCALE       0x0002          /* window scaling */
  271 #define TOF_SACKPERM    0x0004          /* SACK permitted */
  272 #define TOF_TS          0x0010          /* timestamp */
  273 #define TOF_SIGNATURE   0x0040          /* TCP-MD5 signature option (RFC2385) */
  274 #define TOF_SACK        0x0080          /* Peer sent SACK option */
  275 #define TOF_MAXOPT      0x0100
  276         u_int32_t       to_tsval;       /* new timestamp */
  277         u_int32_t       to_tsecr;       /* reflected timestamp */
  278         u_char          *to_sacks;      /* pointer to the first SACK blocks */
  279         u_char          *to_signature;  /* pointer to the TCP-MD5 signature */
  280         u_int16_t       to_mss;         /* maximum segment size */
  281         u_int8_t        to_wscale;      /* window scaling */
  282         u_int8_t        to_nsacks;      /* number of SACK blocks */
  283 };
  284 
  285 /*
  286  * Flags for tcp_dooptions.
  287  */
  288 #define TO_SYN          0x01            /* parse SYN-only options */
  289 
  290 struct hc_metrics_lite {        /* must stay in sync with hc_metrics */
  291         u_long  rmx_mtu;        /* MTU for this path */
  292         u_long  rmx_ssthresh;   /* outbound gateway buffer limit */
  293         u_long  rmx_rtt;        /* estimated round trip time */
  294         u_long  rmx_rttvar;     /* estimated rtt variance */
  295         u_long  rmx_bandwidth;  /* estimated bandwidth */
  296         u_long  rmx_cwnd;       /* congestion window */
  297         u_long  rmx_sendpipe;   /* outbound delay-bandwidth product */
  298         u_long  rmx_recvpipe;   /* inbound delay-bandwidth product */
  299 };
  300 
  301 #ifndef _NETINET_IN_PCB_H_
  302 struct in_conninfo;
  303 #endif /* _NETINET_IN_PCB_H_ */
  304 
  305 struct tcptw {
  306         struct inpcb    *tw_inpcb;      /* XXX back pointer to internet pcb */
  307         tcp_seq         snd_nxt;
  308         tcp_seq         rcv_nxt;
  309         tcp_seq         iss;
  310         tcp_seq         irs;
  311         u_short         last_win;       /* cached window value */
  312         u_short         tw_so_options;  /* copy of so_options */
  313         struct ucred    *tw_cred;       /* user credentials */
  314         u_int32_t       t_recent;
  315         u_int32_t       ts_offset;      /* our timestamp offset */
  316         u_int           t_starttime;
  317         int             tw_time;
  318         TAILQ_ENTRY(tcptw) tw_2msl;
  319 };
  320 
  321 #define intotcpcb(ip)   ((struct tcpcb *)(ip)->inp_ppcb)
  322 #define intotw(ip)      ((struct tcptw *)(ip)->inp_ppcb)
  323 #define sototcpcb(so)   (intotcpcb(sotoinpcb(so)))
  324 
  325 /*
  326  * The smoothed round-trip time and estimated variance
  327  * are stored as fixed point numbers scaled by the values below.
  328  * For convenience, these scales are also used in smoothing the average
  329  * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
  330  * With these scales, srtt has 3 bits to the right of the binary point,
  331  * and thus an "ALPHA" of 0.875.  rttvar has 2 bits to the right of the
  332  * binary point, and is smoothed with an ALPHA of 0.75.
  333  */
  334 #define TCP_RTT_SCALE           32      /* multiplier for srtt; 3 bits frac. */
  335 #define TCP_RTT_SHIFT           5       /* shift for srtt; 3 bits frac. */
  336 #define TCP_RTTVAR_SCALE        16      /* multiplier for rttvar; 2 bits */
  337 #define TCP_RTTVAR_SHIFT        4       /* shift for rttvar; 2 bits */
  338 #define TCP_DELTA_SHIFT         2       /* see tcp_input.c */
  339 
  340 /*
  341  * The initial retransmission should happen at rtt + 4 * rttvar.
  342  * Because of the way we do the smoothing, srtt and rttvar
  343  * will each average +1/2 tick of bias.  When we compute
  344  * the retransmit timer, we want 1/2 tick of rounding and
  345  * 1 extra tick because of +-1/2 tick uncertainty in the
  346  * firing of the timer.  The bias will give us exactly the
  347  * 1.5 tick we need.  But, because the bias is
  348  * statistical, we have to test that we don't drop below
  349  * the minimum feasible timer (which is 2 ticks).
  350  * This version of the macro adapted from a paper by Lawrence
  351  * Brakmo and Larry Peterson which outlines a problem caused
  352  * by insufficient precision in the original implementation,
  353  * which results in inappropriately large RTO values for very
  354  * fast networks.
  355  */
  356 #define TCP_REXMTVAL(tp) \
  357         max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT))  \
  358           + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
  359 
  360 /*
  361  * TCP statistics.
  362  * Many of these should be kept per connection,
  363  * but that's inconvenient at the moment.
  364  */
  365 struct  tcpstat {
  366         u_long  tcps_connattempt;       /* connections initiated */
  367         u_long  tcps_accepts;           /* connections accepted */
  368         u_long  tcps_connects;          /* connections established */
  369         u_long  tcps_drops;             /* connections dropped */
  370         u_long  tcps_conndrops;         /* embryonic connections dropped */
  371         u_long  tcps_minmssdrops;       /* average minmss too low drops */
  372         u_long  tcps_closed;            /* conn. closed (includes drops) */
  373         u_long  tcps_segstimed;         /* segs where we tried to get rtt */
  374         u_long  tcps_rttupdated;        /* times we succeeded */
  375         u_long  tcps_delack;            /* delayed acks sent */
  376         u_long  tcps_timeoutdrop;       /* conn. dropped in rxmt timeout */
  377         u_long  tcps_rexmttimeo;        /* retransmit timeouts */
  378         u_long  tcps_persisttimeo;      /* persist timeouts */
  379         u_long  tcps_keeptimeo;         /* keepalive timeouts */
  380         u_long  tcps_keepprobe;         /* keepalive probes sent */
  381         u_long  tcps_keepdrops;         /* connections dropped in keepalive */
  382 
  383         u_long  tcps_sndtotal;          /* total packets sent */
  384         u_long  tcps_sndpack;           /* data packets sent */
  385         u_long  tcps_sndbyte;           /* data bytes sent */
  386         u_long  tcps_sndrexmitpack;     /* data packets retransmitted */
  387         u_long  tcps_sndrexmitbyte;     /* data bytes retransmitted */
  388         u_long  tcps_sndrexmitbad;      /* unnecessary packet retransmissions */
  389         u_long  tcps_sndacks;           /* ack-only packets sent */
  390         u_long  tcps_sndprobe;          /* window probes sent */
  391         u_long  tcps_sndurg;            /* packets sent with URG only */
  392         u_long  tcps_sndwinup;          /* window update-only packets sent */
  393         u_long  tcps_sndctrl;           /* control (SYN|FIN|RST) packets sent */
  394 
  395         u_long  tcps_rcvtotal;          /* total packets received */
  396         u_long  tcps_rcvpack;           /* packets received in sequence */
  397         u_long  tcps_rcvbyte;           /* bytes received in sequence */
  398         u_long  tcps_rcvbadsum;         /* packets received with ccksum errs */
  399         u_long  tcps_rcvbadoff;         /* packets received with bad offset */
  400         u_long  tcps_rcvmemdrop;        /* packets dropped for lack of memory */
  401         u_long  tcps_rcvshort;          /* packets received too short */
  402         u_long  tcps_rcvduppack;        /* duplicate-only packets received */
  403         u_long  tcps_rcvdupbyte;        /* duplicate-only bytes received */
  404         u_long  tcps_rcvpartduppack;    /* packets with some duplicate data */
  405         u_long  tcps_rcvpartdupbyte;    /* dup. bytes in part-dup. packets */
  406         u_long  tcps_rcvoopack;         /* out-of-order packets received */
  407         u_long  tcps_rcvoobyte;         /* out-of-order bytes received */
  408         u_long  tcps_rcvpackafterwin;   /* packets with data after window */
  409         u_long  tcps_rcvbyteafterwin;   /* bytes rcvd after window */
  410         u_long  tcps_rcvafterclose;     /* packets rcvd after "close" */
  411         u_long  tcps_rcvwinprobe;       /* rcvd window probe packets */
  412         u_long  tcps_rcvdupack;         /* rcvd duplicate acks */
  413         u_long  tcps_rcvacktoomuch;     /* rcvd acks for unsent data */
  414         u_long  tcps_rcvackpack;        /* rcvd ack packets */
  415         u_long  tcps_rcvackbyte;        /* bytes acked by rcvd acks */
  416         u_long  tcps_rcvwinupd;         /* rcvd window update packets */
  417         u_long  tcps_pawsdrop;          /* segments dropped due to PAWS */
  418         u_long  tcps_predack;           /* times hdr predict ok for acks */
  419         u_long  tcps_preddat;           /* times hdr predict ok for data pkts */
  420         u_long  tcps_pcbcachemiss;
  421         u_long  tcps_cachedrtt;         /* times cached RTT in route updated */
  422         u_long  tcps_cachedrttvar;      /* times cached rttvar updated */
  423         u_long  tcps_cachedssthresh;    /* times cached ssthresh updated */
  424         u_long  tcps_usedrtt;           /* times RTT initialized from route */
  425         u_long  tcps_usedrttvar;        /* times RTTVAR initialized from rt */
  426         u_long  tcps_usedssthresh;      /* times ssthresh initialized from rt*/
  427         u_long  tcps_persistdrop;       /* timeout in persist state */
  428         u_long  tcps_badsyn;            /* bogus SYN, e.g. premature ACK */
  429         u_long  tcps_mturesent;         /* resends due to MTU discovery */
  430         u_long  tcps_listendrop;        /* listen queue overflows */
  431         u_long  tcps_badrst;            /* ignored RSTs in the window */
  432 
  433         u_long  tcps_sc_added;          /* entry added to syncache */
  434         u_long  tcps_sc_retransmitted;  /* syncache entry was retransmitted */
  435         u_long  tcps_sc_dupsyn;         /* duplicate SYN packet */
  436         u_long  tcps_sc_dropped;        /* could not reply to packet */
  437         u_long  tcps_sc_completed;      /* successful extraction of entry */
  438         u_long  tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */
  439         u_long  tcps_sc_cacheoverflow;  /* syncache cache limit hit */
  440         u_long  tcps_sc_reset;          /* RST removed entry from syncache */
  441         u_long  tcps_sc_stale;          /* timed out or listen socket gone */
  442         u_long  tcps_sc_aborted;        /* syncache entry aborted */
  443         u_long  tcps_sc_badack;         /* removed due to bad ACK */
  444         u_long  tcps_sc_unreach;        /* ICMP unreachable received */
  445         u_long  tcps_sc_zonefail;       /* zalloc() failed */
  446         u_long  tcps_sc_sendcookie;     /* SYN cookie sent */
  447         u_long  tcps_sc_recvcookie;     /* SYN cookie received */
  448 
  449         u_long  tcps_hc_added;          /* entry added to hostcache */
  450         u_long  tcps_hc_bucketoverflow; /* hostcache per bucket limit hit */
  451 
  452         u_long  tcps_finwait2_drops;    /* Drop FIN_WAIT_2 connection after time limit */
  453 
  454         /* SACK related stats */
  455         u_long  tcps_sack_recovery_episode; /* SACK recovery episodes */
  456         u_long  tcps_sack_rexmits;          /* SACK rexmit segments   */
  457         u_long  tcps_sack_rexmit_bytes;     /* SACK rexmit bytes      */
  458         u_long  tcps_sack_rcv_blocks;       /* SACK blocks (options) received */
  459         u_long  tcps_sack_send_blocks;      /* SACK blocks (options) sent     */
  460         u_long  tcps_sack_sboverflow;       /* times scoreboard overflowed */
  461         
  462         /* ECN related stats */
  463         u_long  tcps_ecn_ce;            /* ECN Congestion Experienced */
  464         u_long  tcps_ecn_ect0;          /* ECN Capable Transport */
  465         u_long  tcps_ecn_ect1;          /* ECN Capable Transport */
  466         u_long  tcps_ecn_shs;           /* ECN successful handshakes */
  467         u_long  tcps_ecn_rcwnd;         /* # times ECN reduced the cwnd */
  468 
  469         u_long  _pad[12];               /* 6 UTO, 6 TBD */
  470 };
  471 
  472 #ifdef _KERNEL
  473 /*
  474  * In-kernel consumers can use these accessor macros directly to update
  475  * stats.
  476  */
  477 #define TCPSTAT_ADD(name, val)  V_tcpstat.name += (val)
  478 #define TCPSTAT_INC(name)       TCPSTAT_ADD(name, 1)
  479 
  480 /*
  481  * Kernel module consumers must use this accessor macro.
  482  */
  483 void    kmod_tcpstat_inc(int statnum);
  484 #define KMOD_TCPSTAT_INC(name)                                          \
  485         kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(u_long))
  486 #endif
  487 
  488 /*
  489  * TCB structure exported to user-land via sysctl(3).
  490  * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
  491  * included.  Not all of our clients do.
  492  */
  493 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
  494 struct  xtcpcb {
  495         size_t  xt_len;
  496         struct  inpcb   xt_inp;
  497         struct  tcpcb   xt_tp;
  498         struct  xsocket xt_socket;
  499         u_quad_t        xt_alignment_hack;
  500 };
  501 #endif
  502 
  503 /*
  504  * Names for TCP sysctl objects
  505  */
  506 #define TCPCTL_DO_RFC1323       1       /* use RFC-1323 extensions */
  507 #define TCPCTL_MSSDFLT          3       /* MSS default */
  508 #define TCPCTL_STATS            4       /* statistics (read-only) */
  509 #define TCPCTL_RTTDFLT          5       /* default RTT estimate */
  510 #define TCPCTL_KEEPIDLE         6       /* keepalive idle timer */
  511 #define TCPCTL_KEEPINTVL        7       /* interval to send keepalives */
  512 #define TCPCTL_SENDSPACE        8       /* send buffer space */
  513 #define TCPCTL_RECVSPACE        9       /* receive buffer space */
  514 #define TCPCTL_KEEPINIT         10      /* timeout for establishing syn */
  515 #define TCPCTL_PCBLIST          11      /* list of all outstanding PCBs */
  516 #define TCPCTL_DELACKTIME       12      /* time before sending delayed ACK */
  517 #define TCPCTL_V6MSSDFLT        13      /* MSS default for IPv6 */
  518 #define TCPCTL_SACK             14      /* Selective Acknowledgement,rfc 2018 */
  519 #define TCPCTL_DROP             15      /* drop tcp connection */
  520 #define TCPCTL_MAXID            16
  521 #define TCPCTL_FINWAIT2_TIMEOUT        17
  522 
  523 #define TCPCTL_NAMES { \
  524         { 0, 0 }, \
  525         { "rfc1323", CTLTYPE_INT }, \
  526         { "mssdflt", CTLTYPE_INT }, \
  527         { "stats", CTLTYPE_STRUCT }, \
  528         { "rttdflt", CTLTYPE_INT }, \
  529         { "keepidle", CTLTYPE_INT }, \
  530         { "keepintvl", CTLTYPE_INT }, \
  531         { "sendspace", CTLTYPE_INT }, \
  532         { "recvspace", CTLTYPE_INT }, \
  533         { "keepinit", CTLTYPE_INT }, \
  534         { "pcblist", CTLTYPE_STRUCT }, \
  535         { "delacktime", CTLTYPE_INT }, \
  536         { "v6mssdflt", CTLTYPE_INT }, \
  537         { "maxid", CTLTYPE_INT }, \
  538 }
  539 
  540 
  541 #ifdef _KERNEL
  542 #ifdef SYSCTL_DECL
  543 SYSCTL_DECL(_net_inet_tcp);
  544 SYSCTL_DECL(_net_inet_tcp_sack);
  545 MALLOC_DECLARE(M_TCPLOG);
  546 #endif
  547 
  548 VNET_DECLARE(struct inpcbhead, tcb);            /* queue of active tcpcb's */
  549 VNET_DECLARE(struct inpcbinfo, tcbinfo);
  550 VNET_DECLARE(struct tcpstat, tcpstat);          /* tcp statistics */
  551 extern  int tcp_log_in_vain;
  552 VNET_DECLARE(int, tcp_mssdflt); /* XXX */
  553 VNET_DECLARE(int, tcp_minmss);
  554 VNET_DECLARE(int, tcp_delack_enabled);
  555 VNET_DECLARE(int, tcp_do_rfc3390);
  556 VNET_DECLARE(int, tcp_do_newreno);
  557 VNET_DECLARE(int, path_mtu_discovery);
  558 VNET_DECLARE(int, ss_fltsz);
  559 VNET_DECLARE(int, ss_fltsz_local);
  560 #define V_tcb                   VNET(tcb)
  561 #define V_tcbinfo               VNET(tcbinfo)
  562 #define V_tcpstat               VNET(tcpstat)
  563 #define V_tcp_mssdflt           VNET(tcp_mssdflt)
  564 #define V_tcp_minmss            VNET(tcp_minmss)
  565 #define V_tcp_delack_enabled    VNET(tcp_delack_enabled)
  566 #define V_tcp_do_rfc3390        VNET(tcp_do_rfc3390)
  567 #define V_tcp_do_newreno        VNET(tcp_do_newreno)
  568 #define V_path_mtu_discovery    VNET(path_mtu_discovery)
  569 #define V_ss_fltsz              VNET(ss_fltsz)
  570 #define V_ss_fltsz_local        VNET(ss_fltsz_local)
  571 
  572 VNET_DECLARE(int, tcp_do_sack);                 /* SACK enabled/disabled */
  573 VNET_DECLARE(int, tcp_sc_rst_sock_fail);        /* RST on sock alloc failure */
  574 #define V_tcp_do_sack           VNET(tcp_do_sack)
  575 #define V_tcp_sc_rst_sock_fail  VNET(tcp_sc_rst_sock_fail)
  576 
  577 VNET_DECLARE(int, tcp_do_ecn);                  /* TCP ECN enabled/disabled */
  578 VNET_DECLARE(int, tcp_ecn_maxretries);
  579 #define V_tcp_do_ecn            VNET(tcp_do_ecn)
  580 #define V_tcp_ecn_maxretries    VNET(tcp_ecn_maxretries)
  581 
  582 int      tcp_addoptions(struct tcpopt *, u_char *);
  583 struct tcpcb *
  584          tcp_close(struct tcpcb *);
  585 void     tcp_discardcb(struct tcpcb *);
  586 void     tcp_twstart(struct tcpcb *);
  587 #if 0
  588 int      tcp_twrecycleable(struct tcptw *tw);
  589 #endif
  590 void     tcp_twclose(struct tcptw *_tw, int _reuse);
  591 void     tcp_ctlinput(int, struct sockaddr *, void *);
  592 int      tcp_ctloutput(struct socket *, struct sockopt *);
  593 struct tcpcb *
  594          tcp_drop(struct tcpcb *, int);
  595 void     tcp_drain(void);
  596 void     tcp_init(void);
  597 #ifdef VIMAGE
  598 void     tcp_destroy(void);
  599 #endif
  600 void     tcp_fini(void *);
  601 char    *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *,
  602             const void *);
  603 char    *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *,
  604             const void *);
  605 int      tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *);
  606 void     tcp_reass_init(void);
  607 void     tcp_reass_flush(struct tcpcb *);
  608 #ifdef VIMAGE
  609 void     tcp_reass_destroy(void);
  610 #endif
  611 void     tcp_input(struct mbuf *, int);
  612 u_long   tcp_maxmtu(struct in_conninfo *, int *);
  613 u_long   tcp_maxmtu6(struct in_conninfo *, int *);
  614 void     tcp_mss_update(struct tcpcb *, int, struct hc_metrics_lite *, int *);
  615 void     tcp_mss(struct tcpcb *, int);
  616 int      tcp_mssopt(struct in_conninfo *);
  617 struct inpcb *
  618          tcp_drop_syn_sent(struct inpcb *, int);
  619 struct inpcb *
  620          tcp_mtudisc(struct inpcb *, int);
  621 struct tcpcb *
  622          tcp_newtcpcb(struct inpcb *);
  623 int      tcp_output(struct tcpcb *);
  624 void     tcp_respond(struct tcpcb *, void *,
  625             struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
  626 void     tcp_tw_init(void);
  627 #ifdef VIMAGE
  628 void     tcp_tw_destroy(void);
  629 #endif
  630 void     tcp_tw_zone_change(void);
  631 int      tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *,
  632             struct mbuf *, int);
  633 int      tcp_twrespond(struct tcptw *, int);
  634 void     tcp_setpersist(struct tcpcb *);
  635 #ifdef TCP_SIGNATURE
  636 int      tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int);
  637 #endif
  638 void     tcp_slowtimo(void);
  639 struct tcptemp *
  640          tcpip_maketemplate(struct inpcb *);
  641 void     tcpip_fillheaders(struct inpcb *, void *, void *);
  642 void     tcp_timer_activate(struct tcpcb *, int, u_int);
  643 int      tcp_timer_active(struct tcpcb *, int);
  644 void     tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int);
  645 void     tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq);
  646 /*
  647  * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo)
  648  */
  649 void     tcp_hc_init(void);
  650 #ifdef VIMAGE
  651 void     tcp_hc_destroy(void);
  652 #endif
  653 void     tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *);
  654 u_long   tcp_hc_getmtu(struct in_conninfo *);
  655 void     tcp_hc_updatemtu(struct in_conninfo *, u_long);
  656 void     tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *);
  657 
  658 extern  struct pr_usrreqs tcp_usrreqs;
  659 extern  u_long tcp_sendspace;
  660 extern  u_long tcp_recvspace;
  661 tcp_seq tcp_new_isn(struct tcpcb *);
  662 
  663 void     tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq);
  664 void     tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
  665 void     tcp_clean_sackreport(struct tcpcb *tp);
  666 void     tcp_sack_adjust(struct tcpcb *tp);
  667 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt);
  668 void     tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
  669 void     tcp_free_sackholes(struct tcpcb *tp);
  670 int      tcp_newreno(struct tcpcb *, struct tcphdr *);
  671 u_long   tcp_seq_subtract(u_long, u_long );
  672 
  673 #endif /* _KERNEL */
  674 
  675 #endif /* _NETINET_TCP_VAR_H_ */

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