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Annotation of XNU/bsd/netinet/tcp_var.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1982, 1986, 1993, 1994, 1995
        !            24:  *     The Regents of the University of California.  All rights reserved.
        !            25:  *
        !            26:  * Redistribution and use in source and binary forms, with or without
        !            27:  * modification, are permitted provided that the following conditions
        !            28:  * are met:
        !            29:  * 1. Redistributions of source code must retain the above copyright
        !            30:  *    notice, this list of conditions and the following disclaimer.
        !            31:  * 2. Redistributions in binary form must reproduce the above copyright
        !            32:  *    notice, this list of conditions and the following disclaimer in the
        !            33:  *    documentation and/or other materials provided with the distribution.
        !            34:  * 3. All advertising materials mentioning features or use of this software
        !            35:  *    must display the following acknowledgement:
        !            36:  *     This product includes software developed by the University of
        !            37:  *     California, Berkeley and its contributors.
        !            38:  * 4. Neither the name of the University nor the names of its contributors
        !            39:  *    may be used to endorse or promote products derived from this software
        !            40:  *    without specific prior written permission.
        !            41:  *
        !            42:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            43:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            44:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            45:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            46:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            47:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            48:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            49:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            50:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            51:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            52:  * SUCH DAMAGE.
        !            53:  *
        !            54:  *     @(#)tcp_var.h   8.4 (Berkeley) 5/24/95
        !            55:  */
        !            56: 
        !            57: #ifndef _NETINET_TCP_VAR_H_
        !            58: #define _NETINET_TCP_VAR_H_
        !            59: /*
        !            60:  * Kernel variables for tcp.
        !            61:  */
        !            62: 
        !            63: /*
        !            64:  * Tcp control block, one per tcp; fields:
        !            65:  * Organized for 16 byte cacheline efficiency.
        !            66:  */
        !            67: struct tcpcb {
        !            68:        struct  mbuf *t_segq;
        !            69:        int     t_dupacks;              /* consecutive dup acks recd */
        !            70:        struct  tcpiphdr *t_template;   /* skeletal packet for transmit */
        !            71: 
        !            72:        int     t_timer[TCPT_NTIMERS];  /* tcp timers */
        !            73: 
        !            74:        struct  inpcb *t_inpcb;         /* back pointer to internet pcb */
        !            75:        int     t_state;                /* state of this connection */
        !            76:        u_int   t_flags;
        !            77: #define        TF_ACKNOW       0x00001         /* ack peer immediately */
        !            78: #define        TF_DELACK       0x00002         /* ack, but try to delay it */
        !            79: #define        TF_NODELAY      0x00004         /* don't delay packets to coalesce */
        !            80: #define        TF_NOOPT        0x00008         /* don't use tcp options */
        !            81: #define        TF_SENTFIN      0x00010         /* have sent FIN */
        !            82: #define        TF_REQ_SCALE    0x00020         /* have/will request window scaling */
        !            83: #define        TF_RCVD_SCALE   0x00040         /* other side has requested scaling */
        !            84: #define        TF_REQ_TSTMP    0x00080         /* have/will request timestamps */
        !            85: #define        TF_RCVD_TSTMP   0x00100         /* a timestamp was received in SYN */
        !            86: #define        TF_SACK_PERMIT  0x00200         /* other side said I could SACK */
        !            87: #define        TF_NEEDSYN      0x00400         /* send SYN (implicit state) */
        !            88: #define        TF_NEEDFIN      0x00800         /* send FIN (implicit state) */
        !            89: #define        TF_NOPUSH       0x01000         /* don't push */
        !            90: #define        TF_REQ_CC       0x02000         /* have/will request CC */
        !            91: #define        TF_RCVD_CC      0x04000         /* a CC was received in SYN */
        !            92: #define        TF_SENDCCNEW    0x08000         /* send CCnew instead of CC in SYN */
        !            93: #define        TF_MORETOCOME   0x10000         /* More data to be appended to sock */
        !            94:        int     t_force;                /* 1 if forcing out a byte */
        !            95: 
        !            96:        tcp_seq snd_una;                /* send unacknowledged */
        !            97:        tcp_seq snd_max;                /* highest sequence number sent;
        !            98:                                         * used to recognize retransmits
        !            99:                                         */
        !           100:        tcp_seq snd_nxt;                /* send next */
        !           101:        tcp_seq snd_up;                 /* send urgent pointer */
        !           102: 
        !           103:        tcp_seq snd_wl1;                /* window update seg seq number */
        !           104:        tcp_seq snd_wl2;                /* window update seg ack number */
        !           105:        tcp_seq iss;                    /* initial send sequence number */
        !           106:        tcp_seq irs;                    /* initial receive sequence number */
        !           107: 
        !           108:        tcp_seq rcv_nxt;                /* receive next */
        !           109:        tcp_seq rcv_adv;                /* advertised window */
        !           110:        u_long  rcv_wnd;                /* receive window */
        !           111:        tcp_seq rcv_up;                 /* receive urgent pointer */
        !           112: 
        !           113:        u_long  snd_wnd;                /* send window */
        !           114:        u_long  snd_cwnd;               /* congestion-controlled window */
        !           115:        u_long  snd_ssthresh;           /* snd_cwnd size threshold for
        !           116:                                         * for slow start exponential to
        !           117:                                         * linear switch
        !           118:                                         */
        !           119:        u_int   t_maxopd;               /* mss plus options */
        !           120: 
        !           121:        u_int   t_idle;                 /* inactivity time */
        !           122:        u_long  t_duration;             /* connection duration */
        !           123:        int     t_rtt;                  /* round trip time */
        !           124:        tcp_seq t_rtseq;                /* sequence number being timed */
        !           125: 
        !           126:        int     t_rxtcur;               /* current retransmit value */
        !           127:        u_int   t_maxseg;               /* maximum segment size */
        !           128:        int     t_srtt;                 /* smoothed round-trip time */
        !           129:        int     t_rttvar;               /* variance in round-trip time */
        !           130: 
        !           131:        int     t_rxtshift;             /* log(2) of rexmt exp. backoff */
        !           132:        u_int   t_rttmin;               /* minimum rtt allowed */
        !           133:        u_long  t_rttupdated;           /* number of times rtt sampled */
        !           134:        u_long  max_sndwnd;             /* largest window peer has offered */
        !           135: 
        !           136:        int     t_softerror;            /* possible error not yet reported */
        !           137: /* out-of-band data */
        !           138:        char    t_oobflags;             /* have some */
        !           139:        char    t_iobc;                 /* input character */
        !           140: #define        TCPOOB_HAVEDATA 0x01
        !           141: #define        TCPOOB_HADDATA  0x02
        !           142: /* RFC 1323 variables */
        !           143:        u_char  snd_scale;              /* window scaling for send window */
        !           144:        u_char  rcv_scale;              /* window scaling for recv window */
        !           145:        u_char  request_r_scale;        /* pending window scaling */
        !           146:        u_char  requested_s_scale;
        !           147:        u_long  ts_recent;              /* timestamp echo data */
        !           148: 
        !           149:        u_long  ts_recent_age;          /* when last updated */
        !           150:        tcp_seq last_ack_sent;
        !           151: /* RFC 1644 variables */
        !           152:        tcp_cc  cc_send;                /* send connection count */
        !           153:        tcp_cc  cc_recv;                /* receive connection count */
        !           154: };
        !           155: 
        !           156: /*
        !           157:  * Structure to hold TCP options that are only used during segment
        !           158:  * processing (in tcp_input), but not held in the tcpcb.
        !           159:  * It's basically used to reduce the number of parameters
        !           160:  * to tcp_dooptions.
        !           161:  */
        !           162: struct tcpopt {
        !           163:        u_long  to_flag;                /* which options are present */
        !           164: #define TOF_TS         0x0001          /* timestamp */
        !           165: #define TOF_CC         0x0002          /* CC and CCnew are exclusive */
        !           166: #define TOF_CCNEW      0x0004
        !           167: #define        TOF_CCECHO      0x0008
        !           168:        u_long  to_tsval;
        !           169:        u_long  to_tsecr;
        !           170:        tcp_cc  to_cc;          /* holds CC or CCnew */
        !           171:        tcp_cc  to_ccecho;
        !           172: };
        !           173: 
        !           174: /*
        !           175:  * The TAO cache entry which is stored in the protocol family specific
        !           176:  * portion of the route metrics.
        !           177:  */
        !           178: struct rmxp_tao {
        !           179:        tcp_cc  tao_cc;                 /* latest CC in valid SYN */
        !           180:        tcp_cc  tao_ccsent;             /* latest CC sent to peer */
        !           181:        u_short tao_mssopt;             /* peer's cached MSS */
        !           182: #ifdef notyet
        !           183:        u_short tao_flags;              /* cache status flags */
        !           184: #define        TAOF_DONT       0x0001          /* peer doesn't understand rfc1644 */
        !           185: #define        TAOF_OK         0x0002          /* peer does understand rfc1644 */
        !           186: #define        TAOF_UNDEF      0               /* we don't know yet */
        !           187: #endif /* notyet */
        !           188: };
        !           189: #define rmx_taop(r)    ((struct rmxp_tao *)(r).rmx_filler)
        !           190: 
        !           191: #define        intotcpcb(ip)   ((struct tcpcb *)(ip)->inp_ppcb)
        !           192: #define        sototcpcb(so)   (intotcpcb(sotoinpcb(so)))
        !           193: 
        !           194: /*
        !           195:  * The smoothed round-trip time and estimated variance
        !           196:  * are stored as fixed point numbers scaled by the values below.
        !           197:  * For convenience, these scales are also used in smoothing the average
        !           198:  * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
        !           199:  * With these scales, srtt has 3 bits to the right of the binary point,
        !           200:  * and thus an "ALPHA" of 0.875.  rttvar has 2 bits to the right of the
        !           201:  * binary point, and is smoothed with an ALPHA of 0.75.
        !           202:  */
        !           203: #define        TCP_RTT_SCALE           32      /* multiplier for srtt; 3 bits frac. */
        !           204: #define        TCP_RTT_SHIFT           5       /* shift for srtt; 3 bits frac. */
        !           205: #define        TCP_RTTVAR_SCALE        16      /* multiplier for rttvar; 2 bits */
        !           206: #define        TCP_RTTVAR_SHIFT        4       /* shift for rttvar; 2 bits */
        !           207: #define        TCP_DELTA_SHIFT         2       /* see tcp_input.c */
        !           208: 
        !           209: /*
        !           210:  * The initial retransmission should happen at rtt + 4 * rttvar.
        !           211:  * Because of the way we do the smoothing, srtt and rttvar
        !           212:  * will each average +1/2 tick of bias.  When we compute
        !           213:  * the retransmit timer, we want 1/2 tick of rounding and
        !           214:  * 1 extra tick because of +-1/2 tick uncertainty in the
        !           215:  * firing of the timer.  The bias will give us exactly the
        !           216:  * 1.5 tick we need.  But, because the bias is
        !           217:  * statistical, we have to test that we don't drop below
        !           218:  * the minimum feasible timer (which is 2 ticks).
        !           219:  * This version of the macro adapted from a paper by Lawrence
        !           220:  * Brakmo and Larry Peterson which outlines a problem caused
        !           221:  * by insufficient precision in the original implementation,
        !           222:  * which results in inappropriately large RTO values for very
        !           223:  * fast networks.
        !           224:  */
        !           225: #define        TCP_REXMTVAL(tp) \
        !           226:        max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT))  \
        !           227:          + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
        !           228: 
        !           229: /*
        !           230:  * TCP statistics.
        !           231:  * Many of these should be kept per connection,
        !           232:  * but that's inconvenient at the moment.
        !           233:  */
        !           234: struct tcpstat {
        !           235:        u_long  tcps_connattempt;       /* connections initiated */
        !           236:        u_long  tcps_accepts;           /* connections accepted */
        !           237:        u_long  tcps_connects;          /* connections established */
        !           238:        u_long  tcps_drops;             /* connections dropped */
        !           239:        u_long  tcps_conndrops;         /* embryonic connections dropped */
        !           240:        u_long  tcps_closed;            /* conn. closed (includes drops) */
        !           241:        u_long  tcps_segstimed;         /* segs where we tried to get rtt */
        !           242:        u_long  tcps_rttupdated;        /* times we succeeded */
        !           243:        u_long  tcps_delack;            /* delayed acks sent */
        !           244:        u_long  tcps_timeoutdrop;       /* conn. dropped in rxmt timeout */
        !           245:        u_long  tcps_rexmttimeo;        /* retransmit timeouts */
        !           246:        u_long  tcps_persisttimeo;      /* persist timeouts */
        !           247:        u_long  tcps_keeptimeo;         /* keepalive timeouts */
        !           248:        u_long  tcps_keepprobe;         /* keepalive probes sent */
        !           249:        u_long  tcps_keepdrops;         /* connections dropped in keepalive */
        !           250: 
        !           251:        u_long  tcps_sndtotal;          /* total packets sent */
        !           252:        u_long  tcps_sndpack;           /* data packets sent */
        !           253:        u_long  tcps_sndbyte;           /* data bytes sent */
        !           254:        u_long  tcps_sndrexmitpack;     /* data packets retransmitted */
        !           255:        u_long  tcps_sndrexmitbyte;     /* data bytes retransmitted */
        !           256:        u_long  tcps_sndacks;           /* ack-only packets sent */
        !           257:        u_long  tcps_sndprobe;          /* window probes sent */
        !           258:        u_long  tcps_sndurg;            /* packets sent with URG only */
        !           259:        u_long  tcps_sndwinup;          /* window update-only packets sent */
        !           260:        u_long  tcps_sndctrl;           /* control (SYN|FIN|RST) packets sent */
        !           261: 
        !           262:        u_long  tcps_rcvtotal;          /* total packets received */
        !           263:        u_long  tcps_rcvpack;           /* packets received in sequence */
        !           264:        u_long  tcps_rcvbyte;           /* bytes received in sequence */
        !           265:        u_long  tcps_rcvbadsum;         /* packets received with ccksum errs */
        !           266:        u_long  tcps_rcvbadoff;         /* packets received with bad offset */
        !           267:        u_long  tcps_rcvshort;          /* packets received too short */
        !           268:        u_long  tcps_rcvduppack;        /* duplicate-only packets received */
        !           269:        u_long  tcps_rcvdupbyte;        /* duplicate-only bytes received */
        !           270:        u_long  tcps_rcvpartduppack;    /* packets with some duplicate data */
        !           271:        u_long  tcps_rcvpartdupbyte;    /* dup. bytes in part-dup. packets */
        !           272:        u_long  tcps_rcvoopack;         /* out-of-order packets received */
        !           273:        u_long  tcps_rcvoobyte;         /* out-of-order bytes received */
        !           274:        u_long  tcps_rcvpackafterwin;   /* packets with data after window */
        !           275:        u_long  tcps_rcvbyteafterwin;   /* bytes rcvd after window */
        !           276:        u_long  tcps_rcvafterclose;     /* packets rcvd after "close" */
        !           277:        u_long  tcps_rcvwinprobe;       /* rcvd window probe packets */
        !           278:        u_long  tcps_rcvdupack;         /* rcvd duplicate acks */
        !           279:        u_long  tcps_rcvacktoomuch;     /* rcvd acks for unsent data */
        !           280:        u_long  tcps_rcvackpack;        /* rcvd ack packets */
        !           281:        u_long  tcps_rcvackbyte;        /* bytes acked by rcvd acks */
        !           282:        u_long  tcps_rcvwinupd;         /* rcvd window update packets */
        !           283:        u_long  tcps_pawsdrop;          /* segments dropped due to PAWS */
        !           284:        u_long  tcps_predack;           /* times hdr predict ok for acks */
        !           285:        u_long  tcps_preddat;           /* times hdr predict ok for data pkts */
        !           286:        u_long  tcps_pcbcachemiss;
        !           287:        u_long  tcps_cachedrtt;         /* times cached RTT in route updated */
        !           288:        u_long  tcps_cachedrttvar;      /* times cached rttvar updated */
        !           289:        u_long  tcps_cachedssthresh;    /* times cached ssthresh updated */
        !           290:        u_long  tcps_usedrtt;           /* times RTT initialized from route */
        !           291:        u_long  tcps_usedrttvar;        /* times RTTVAR initialized from rt */
        !           292:        u_long  tcps_usedssthresh;      /* times ssthresh initialized from rt*/
        !           293:        u_long  tcps_persistdrop;       /* timeout in persist state */
        !           294:        u_long  tcps_badsyn;            /* bogus SYN, e.g. premature ACK */
        !           295:        u_long  tcps_mturesent;         /* resends due to MTU discovery */
        !           296:        u_long  tcps_listendrop;        /* listen queue overflows */
        !           297: };
        !           298: 
        !           299: /*
        !           300:  * TCB structure exported to user-land via sysctl(3).
        !           301:  * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
        !           302:  * included.  Not all of our clients do.
        !           303:  */
        !           304: #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
        !           305: struct xtcpcb {
        !           306:        size_t  xt_len;
        !           307:        struct  inpcb   xt_inp;
        !           308:        struct  tcpcb   xt_tp;
        !           309:        struct  xsocket xt_socket;
        !           310:        u_quad_t        xt_alignment_hack;
        !           311: };
        !           312: #endif
        !           313: 
        !           314: /*
        !           315:  * Names for TCP sysctl objects
        !           316:  */
        !           317: #define        TCPCTL_DO_RFC1323       1       /* use RFC-1323 extensions */
        !           318: #define        TCPCTL_DO_RFC1644       2       /* use RFC-1644 extensions */
        !           319: #define        TCPCTL_MSSDFLT          3       /* MSS default */
        !           320: #define TCPCTL_STATS           4       /* statistics (read-only) */
        !           321: #define        TCPCTL_RTTDFLT          5       /* default RTT estimate */
        !           322: #define        TCPCTL_KEEPIDLE         6       /* keepalive idle timer */
        !           323: #define        TCPCTL_KEEPINTVL        7       /* interval to send keepalives */
        !           324: #define        TCPCTL_SENDSPACE        8       /* send buffer space */
        !           325: #define        TCPCTL_RECVSPACE        9       /* receive buffer space */
        !           326: #define        TCPCTL_KEEPINIT         10      /* receive buffer space */
        !           327: #define        TCPCTL_PCBLIST          11      /* list of all outstanding PCBs */
        !           328: #define TCPCTL_MAXID           12
        !           329: 
        !           330: #define TCPCTL_NAMES { \
        !           331:        { 0, 0 }, \
        !           332:        { "rfc1323", CTLTYPE_INT }, \
        !           333:        { "rfc1644", CTLTYPE_INT }, \
        !           334:        { "mssdflt", CTLTYPE_INT }, \
        !           335:        { "stats", CTLTYPE_STRUCT }, \
        !           336:        { "rttdflt", CTLTYPE_INT }, \
        !           337:        { "keepidle", CTLTYPE_INT }, \
        !           338:        { "keepintvl", CTLTYPE_INT }, \
        !           339:        { "sendspace", CTLTYPE_INT }, \
        !           340:        { "recvspace", CTLTYPE_INT }, \
        !           341:        { "keepinit", CTLTYPE_INT }, \
        !           342:        { "pcblist", CTLTYPE_STRUCT }, \
        !           343: }
        !           344: 
        !           345: #ifdef KERNEL
        !           346: #ifdef SYSCTL_DECL
        !           347: SYSCTL_DECL(_net_inet_tcp);
        !           348: #endif
        !           349: 
        !           350: extern struct inpcbhead tcb;           /* head of queue of active tcpcb's */
        !           351: extern struct inpcbinfo tcbinfo;
        !           352: extern struct tcpstat tcpstat; /* tcp statistics */
        !           353: extern int tcp_mssdflt;        /* XXX */
        !           354: extern u_long tcp_now;         /* for RFC 1323 timestamps */
        !           355: extern int tcp_delack_enabled;
        !           356: 
        !           357: void    tcp_canceltimers __P((struct tcpcb *));
        !           358: struct tcpcb *
        !           359:         tcp_close __P((struct tcpcb *));
        !           360: void    tcp_ctlinput __P((int, struct sockaddr *, void *));
        !           361: int     tcp_ctloutput __P((struct socket *, struct sockopt *));
        !           362: struct tcpcb *
        !           363:         tcp_drop __P((struct tcpcb *, int));
        !           364: void    tcp_drain __P((void));
        !           365: void    tcp_fasttimo __P((void));
        !           366: struct rmxp_tao *
        !           367:         tcp_gettaocache __P((struct inpcb *));
        !           368: void    tcp_init __P((void));
        !           369: void    tcp_input __P((struct mbuf *, int));
        !           370: void    tcp_mss __P((struct tcpcb *, int));
        !           371: int     tcp_mssopt __P((struct tcpcb *));
        !           372: void    tcp_mtudisc __P((struct inpcb *, int));
        !           373: struct tcpcb *
        !           374:         tcp_newtcpcb __P((struct inpcb *));
        !           375: int     tcp_output __P((struct tcpcb *));
        !           376: void    tcp_quench __P((struct inpcb *, int));
        !           377: void    tcp_respond __P((struct tcpcb *,
        !           378:            struct tcpiphdr *, struct mbuf *, tcp_seq, tcp_seq, int));
        !           379: struct rtentry *
        !           380:         tcp_rtlookup __P((struct inpcb *));
        !           381: void    tcp_setpersist __P((struct tcpcb *));
        !           382: void    tcp_slowtimo __P((void));
        !           383: struct tcpiphdr *
        !           384:         tcp_template __P((struct tcpcb *));
        !           385: struct tcpcb *
        !           386:         tcp_timers __P((struct tcpcb *, int));
        !           387: void    tcp_trace __P((int, int, struct tcpcb *, struct tcpiphdr *, int));
        !           388: 
        !           389: extern struct pr_usrreqs tcp_usrreqs;
        !           390: extern u_long tcp_sendspace;
        !           391: extern u_long tcp_recvspace;
        !           392: 
        !           393: #endif /* KERNEL */
        !           394: 
        !           395: #endif /* _NETINET_TCP_VAR_H_ */

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