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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [netinet/] [tcp_var.h] - Blame information for rev 173

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/*
 * Copyright (c) 1982, 1986, 1993, 1994, 1995
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)tcp_var.h   8.4 (Berkeley) 5/24/95
 *      $Id: tcp_var.h,v 1.2 2001-09-27 12:01:56 chris Exp $
 */
 
#ifndef _NETINET_TCP_VAR_H_
#define _NETINET_TCP_VAR_H_
/*
 * Kernel variables for tcp.
 */
 
/*
 * Tcp control block, one per tcp; fields:
 */
struct tcpcb {
        struct  tcpiphdr *seg_next;     /* sequencing queue */
        struct  tcpiphdr *seg_prev;
        int     t_state;                /* state of this connection */
        int     t_timer[TCPT_NTIMERS];  /* tcp timers */
        int     t_rxtshift;             /* log(2) of rexmt exp. backoff */
        int     t_rxtcur;               /* current retransmit value */
        int     t_dupacks;              /* consecutive dup acks recd */
        u_int   t_maxseg;               /* maximum segment size */
        u_int   t_maxopd;               /* mss plus options */
        int     t_force;                /* 1 if forcing out a byte */
        u_int   t_flags;
#define TF_ACKNOW       0x0001          /* ack peer immediately */
#define TF_DELACK       0x0002          /* ack, but try to delay it */
#define TF_NODELAY      0x0004          /* don't delay packets to coalesce */
#define TF_NOOPT        0x0008          /* don't use tcp options */
#define TF_SENTFIN      0x0010          /* have sent FIN */
#define TF_REQ_SCALE    0x0020          /* have/will request window scaling */
#define TF_RCVD_SCALE   0x0040          /* other side has requested scaling */
#define TF_REQ_TSTMP    0x0080          /* have/will request timestamps */
#define TF_RCVD_TSTMP   0x0100          /* a timestamp was received in SYN */
#define TF_SACK_PERMIT  0x0200          /* other side said I could SACK */
#define TF_NEEDSYN      0x0400          /* send SYN (implicit state) */
#define TF_NEEDFIN      0x0800          /* send FIN (implicit state) */
#define TF_NOPUSH       0x1000          /* don't push */
#define TF_REQ_CC       0x2000          /* have/will request CC */
#define TF_RCVD_CC      0x4000          /* a CC was received in SYN */
#define TF_SENDCCNEW    0x8000          /* send CCnew instead of CC in SYN */
 
        struct  tcpiphdr *t_template;   /* skeletal packet for transmit */
        struct  inpcb *t_inpcb;         /* back pointer to internet pcb */
/*
 * The following fields are used as in the protocol specification.
 * See RFC783, Dec. 1981, page 21.
 */
/* send sequence variables */
        tcp_seq snd_una;                /* send unacknowledged */
        tcp_seq snd_nxt;                /* send next */
        tcp_seq snd_up;                 /* send urgent pointer */
        tcp_seq snd_wl1;                /* window update seg seq number */
        tcp_seq snd_wl2;                /* window update seg ack number */
        tcp_seq iss;                    /* initial send sequence number */
        u_long  snd_wnd;                /* send window */
/* receive sequence variables */
        u_long  rcv_wnd;                /* receive window */
        tcp_seq rcv_nxt;                /* receive next */
        tcp_seq rcv_up;                 /* receive urgent pointer */
        tcp_seq irs;                    /* initial receive sequence number */
/*
 * Additional variables for this implementation.
 */
/* receive variables */
        tcp_seq rcv_adv;                /* advertised window */
/* retransmit variables */
        tcp_seq snd_max;                /* highest sequence number sent;
                                         * used to recognize retransmits
                                         */
/* congestion control (for slow start, source quench, retransmit after loss) */
        u_long  snd_cwnd;               /* congestion-controlled window */
        u_long  snd_ssthresh;           /* snd_cwnd size threshold for
                                         * for slow start exponential to
                                         * linear switch
                                         */
/*
 * transmit timing stuff.  See below for scale of srtt and rttvar.
 * "Variance" is actually smoothed difference.
 */
        u_int   t_idle;                 /* inactivity time */
        int     t_rtt;                  /* round trip time */
        tcp_seq t_rtseq;                /* sequence number being timed */
        int     t_srtt;                 /* smoothed round-trip time */
        int     t_rttvar;               /* variance in round-trip time */
        u_int   t_rttmin;               /* minimum rtt allowed */
        u_long  max_sndwnd;             /* largest window peer has offered */
 
/* out-of-band data */
        char    t_oobflags;             /* have some */
        char    t_iobc;                 /* input character */
#define TCPOOB_HAVEDATA 0x01
#define TCPOOB_HADDATA  0x02
        int     t_softerror;            /* possible error not yet reported */
 
/* RFC 1323 variables */
        u_char  snd_scale;              /* window scaling for send window */
        u_char  rcv_scale;              /* window scaling for recv window */
        u_char  request_r_scale;        /* pending window scaling */
        u_char  requested_s_scale;
        u_long  ts_recent;              /* timestamp echo data */
        u_long  ts_recent_age;          /* when last updated */
        tcp_seq last_ack_sent;
/* RFC 1644 variables */
        tcp_cc  cc_send;                /* send connection count */
        tcp_cc  cc_recv;                /* receive connection count */
        u_long  t_duration;             /* connection duration */
 
/* TUBA stuff */
        caddr_t t_tuba_pcb;             /* next level down pcb for TCP over z */
/* More RTT stuff */
        u_long  t_rttupdated;           /* number of times rtt sampled */
};
 
/*
 * Structure to hold TCP options that are only used during segment
 * processing (in tcp_input), but not held in the tcpcb.
 * It's basically used to reduce the number of parameters
 * to tcp_dooptions.
 */
struct tcpopt {
        u_long  to_flag;                /* which options are present */
#define TOF_TS          0x0001          /* timestamp */
#define TOF_CC          0x0002          /* CC and CCnew are exclusive */
#define TOF_CCNEW       0x0004
#define TOF_CCECHO      0x0008
        u_long  to_tsval;
        u_long  to_tsecr;
        tcp_cc  to_cc;          /* holds CC or CCnew */
        tcp_cc  to_ccecho;
};
 
/*
 * The TAO cache entry which is stored in the protocol family specific
 * portion of the route metrics.
 */
struct rmxp_tao {
        tcp_cc  tao_cc;                 /* latest CC in valid SYN */
        tcp_cc  tao_ccsent;             /* latest CC sent to peer */
        u_short tao_mssopt;             /* peer's cached MSS */
#ifdef notyet
        u_short tao_flags;              /* cache status flags */
#define TAOF_DONT       0x0001          /* peer doesn't understand rfc1644 */
#define TAOF_OK         0x0002          /* peer does understand rfc1644 */
#define TAOF_UNDEF      0                /* we don't know yet */
#endif /* notyet */
};
#define rmx_taop(r)     ((struct rmxp_tao *)(r).rmx_filler)
 
#define intotcpcb(ip)   ((struct tcpcb *)(ip)->inp_ppcb)
#define sototcpcb(so)   (intotcpcb(sotoinpcb(so)))
 
/*
 * The smoothed round-trip time and estimated variance
 * are stored as fixed point numbers scaled by the values below.
 * For convenience, these scales are also used in smoothing the average
 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
 * With these scales, srtt has 3 bits to the right of the binary point,
 * and thus an "ALPHA" of 0.875.  rttvar has 2 bits to the right of the
 * binary point, and is smoothed with an ALPHA of 0.75.
 */
#define TCP_RTT_SCALE           32      /* multiplier for srtt; 3 bits frac. */
#define TCP_RTT_SHIFT           5       /* shift for srtt; 3 bits frac. */
#define TCP_RTTVAR_SCALE        16      /* multiplier for rttvar; 2 bits */
#define TCP_RTTVAR_SHIFT        4       /* shift for rttvar; 2 bits */
#define TCP_DELTA_SHIFT         2       /* see tcp_input.c */
 
/*
 * The initial retransmission should happen at rtt + 4 * rttvar.
 * Because of the way we do the smoothing, srtt and rttvar
 * will each average +1/2 tick of bias.  When we compute
 * the retransmit timer, we want 1/2 tick of rounding and
 * 1 extra tick because of +-1/2 tick uncertainty in the
 * firing of the timer.  The bias will give us exactly the
 * 1.5 tick we need.  But, because the bias is
 * statistical, we have to test that we don't drop below
 * the minimum feasible timer (which is 2 ticks).
 * This version of the macro adapted from a paper by Lawrence
 * Brakmo and Larry Peterson which outlines a problem caused
 * by insufficient precision in the original implementation,
 * which results in inappropriately large RTO values for very
 * fast networks.
 */
#define TCP_REXMTVAL(tp) \
        ((((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT))  \
          + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
 
/* XXX
 * We want to avoid doing m_pullup on incoming packets but that
 * means avoiding dtom on the tcp reassembly code.  That in turn means
 * keeping an mbuf pointer in the reassembly queue (since we might
 * have a cluster).  As a quick hack, the source & destination
 * port numbers (which are no longer needed once we've located the
 * tcpcb) are overlayed with an mbuf pointer.
 */
#define REASS_MBUF(ti) (*(struct mbuf **)&((ti)->ti_t))
 
/*
 * TCP statistics.
 * Many of these should be kept per connection,
 * but that's inconvenient at the moment.
 */
struct  tcpstat {
        u_long  tcps_connattempt;       /* connections initiated */
        u_long  tcps_accepts;           /* connections accepted */
        u_long  tcps_connects;          /* connections established */
        u_long  tcps_drops;             /* connections dropped */
        u_long  tcps_conndrops;         /* embryonic connections dropped */
        u_long  tcps_closed;            /* conn. closed (includes drops) */
        u_long  tcps_segstimed;         /* segs where we tried to get rtt */
        u_long  tcps_rttupdated;        /* times we succeeded */
        u_long  tcps_delack;            /* delayed acks sent */
        u_long  tcps_timeoutdrop;       /* conn. dropped in rxmt timeout */
        u_long  tcps_rexmttimeo;        /* retransmit timeouts */
        u_long  tcps_persisttimeo;      /* persist timeouts */
        u_long  tcps_keeptimeo;         /* keepalive timeouts */
        u_long  tcps_keepprobe;         /* keepalive probes sent */
        u_long  tcps_keepdrops;         /* connections dropped in keepalive */
 
        u_long  tcps_sndtotal;          /* total packets sent */
        u_long  tcps_sndpack;           /* data packets sent */
        u_long  tcps_sndbyte;           /* data bytes sent */
        u_long  tcps_sndrexmitpack;     /* data packets retransmitted */
        u_long  tcps_sndrexmitbyte;     /* data bytes retransmitted */
        u_long  tcps_sndacks;           /* ack-only packets sent */
        u_long  tcps_sndprobe;          /* window probes sent */
        u_long  tcps_sndurg;            /* packets sent with URG only */
        u_long  tcps_sndwinup;          /* window update-only packets sent */
        u_long  tcps_sndctrl;           /* control (SYN|FIN|RST) packets sent */
 
        u_long  tcps_rcvtotal;          /* total packets received */
        u_long  tcps_rcvpack;           /* packets received in sequence */
        u_long  tcps_rcvbyte;           /* bytes received in sequence */
        u_long  tcps_rcvbadsum;         /* packets received with ccksum errs */
        u_long  tcps_rcvbadoff;         /* packets received with bad offset */
        u_long  tcps_rcvshort;          /* packets received too short */
        u_long  tcps_rcvduppack;        /* duplicate-only packets received */
        u_long  tcps_rcvdupbyte;        /* duplicate-only bytes received */
        u_long  tcps_rcvpartduppack;    /* packets with some duplicate data */
        u_long  tcps_rcvpartdupbyte;    /* dup. bytes in part-dup. packets */
        u_long  tcps_rcvoopack;         /* out-of-order packets received */
        u_long  tcps_rcvoobyte;         /* out-of-order bytes received */
        u_long  tcps_rcvpackafterwin;   /* packets with data after window */
        u_long  tcps_rcvbyteafterwin;   /* bytes rcvd after window */
        u_long  tcps_rcvafterclose;     /* packets rcvd after "close" */
        u_long  tcps_rcvwinprobe;       /* rcvd window probe packets */
        u_long  tcps_rcvdupack;         /* rcvd duplicate acks */
        u_long  tcps_rcvacktoomuch;     /* rcvd acks for unsent data */
        u_long  tcps_rcvackpack;        /* rcvd ack packets */
        u_long  tcps_rcvackbyte;        /* bytes acked by rcvd acks */
        u_long  tcps_rcvwinupd;         /* rcvd window update packets */
        u_long  tcps_pawsdrop;          /* segments dropped due to PAWS */
        u_long  tcps_predack;           /* times hdr predict ok for acks */
        u_long  tcps_preddat;           /* times hdr predict ok for data pkts */
        u_long  tcps_pcbcachemiss;
        u_long  tcps_cachedrtt;         /* times cached RTT in route updated */
        u_long  tcps_cachedrttvar;      /* times cached rttvar updated */
        u_long  tcps_cachedssthresh;    /* times cached ssthresh updated */
        u_long  tcps_usedrtt;           /* times RTT initialized from route */
        u_long  tcps_usedrttvar;        /* times RTTVAR initialized from rt */
        u_long  tcps_usedssthresh;      /* times ssthresh initialized from rt*/
        u_long  tcps_persistdrop;       /* timeout in persist state */
        u_long  tcps_badsyn;            /* bogus SYN, e.g. premature ACK */
        u_long  tcps_mturesent;         /* resends due to MTU discovery */
        u_long  tcps_listendrop;        /* listen queue overflows */
};
 
/*
 * Names for TCP sysctl objects
 */
#define TCPCTL_DO_RFC1323       1       /* use RFC-1323 extensions */
#define TCPCTL_DO_RFC1644       2       /* use RFC-1644 extensions */
#define TCPCTL_MSSDFLT          3       /* MSS default */
#define TCPCTL_STATS            4       /* statistics (read-only) */
#define TCPCTL_RTTDFLT          5       /* default RTT estimate */
#define TCPCTL_KEEPIDLE         6       /* keepalive idle timer */
#define TCPCTL_KEEPINTVL        7       /* interval to send keepalives */
#define TCPCTL_SENDSPACE        8       /* send buffer space */
#define TCPCTL_RECVSPACE        9       /* receive buffer space */
#define TCPCTL_KEEPINIT         10      /* receive buffer space */
#define TCPCTL_MAXID            11
 
#define TCPCTL_NAMES { \
        { 0, 0 }, \
        { "rfc1323", CTLTYPE_INT }, \
        { "rfc1644", CTLTYPE_INT }, \
        { "mssdflt", CTLTYPE_INT }, \
        { "stats", CTLTYPE_STRUCT }, \
        { "rttdflt", CTLTYPE_INT }, \
        { "keepidle", CTLTYPE_INT }, \
        { "keepintvl", CTLTYPE_INT }, \
        { "sendspace", CTLTYPE_INT }, \
        { "recvspace", CTLTYPE_INT }, \
        { "keepinit", CTLTYPE_INT }, \
}
 
#ifdef KERNEL
extern  struct inpcbhead tcb;           /* head of queue of active tcpcb's */
extern  struct inpcbinfo tcbinfo;
extern  struct tcpstat tcpstat; /* tcp statistics */
extern  int tcp_mssdflt;        /* XXX */
extern  u_long tcp_now;         /* for RFC 1323 timestamps */
 
void     tcp_canceltimers __P((struct tcpcb *));
struct tcpcb *
         tcp_close __P((struct tcpcb *));
void     tcp_ctlinput __P((int, struct sockaddr *, void *));
int      tcp_ctloutput __P((int, struct socket *, int, int, struct mbuf **));
struct tcpcb *
         tcp_drop __P((struct tcpcb *, int));
void     tcp_drain __P((void));
void     tcp_fasttimo __P((void));
struct rmxp_tao *
         tcp_gettaocache __P((struct inpcb *));
void     tcp_init __P((void));
void     tcp_input __P((struct mbuf *, int));
void     tcp_mss __P((struct tcpcb *, int));
int      tcp_mssopt __P((struct tcpcb *));
void     tcp_mtudisc __P((struct inpcb *, int));
struct tcpcb *
         tcp_newtcpcb __P((struct inpcb *));
int      tcp_output __P((struct tcpcb *));
void     tcp_quench __P((struct inpcb *, int));
void     tcp_respond __P((struct tcpcb *,
            struct tcpiphdr *, struct mbuf *, u_long, u_long, int));
struct rtentry *
         tcp_rtlookup __P((struct inpcb *));
void     tcp_setpersist __P((struct tcpcb *));
void     tcp_slowtimo __P((void));
struct tcpiphdr *
         tcp_template __P((struct tcpcb *));
struct tcpcb *
         tcp_timers __P((struct tcpcb *, int));
void     tcp_trace __P((int, int, struct tcpcb *, struct tcpiphdr *, int));
 
extern  struct pr_usrreqs tcp_usrreqs;
extern  u_long tcp_sendspace;
extern  u_long tcp_recvspace;
 
#endif /* KERNEL */
 
#endif /* _NETINET_TCP_VAR_H_ */

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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [netinet/] [tcp_var.h] - Blame information for rev 173

Line No.	Rev	Author	Line
1	30	unneback	`/*`
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			`* $Id: tcp_var.h,v 1.2 2001-09-27 12:01:56 chris Exp $`
35			`*/`
36
37			`#ifndef _NETINET_TCP_VAR_H_`
38			`#define _NETINET_TCP_VAR_H_`
39			`/*`
40			`* Kernel variables for tcp.`
41			`*/`
42
43			`/*`
44			`* Tcp control block, one per tcp; fields:`
45			`*/`
46			`struct tcpcb {`
47			`struct tcpiphdr seg_next; / sequencing queue */`
48			`struct tcpiphdr *seg_prev;`
49			`int t_state; /* state of this connection */`
50			`int t_timer[TCPT_NTIMERS]; /* tcp timers */`
51			`int t_rxtshift; /* log(2) of rexmt exp. backoff */`
52			`int t_rxtcur; /* current retransmit value */`
53			`int t_dupacks; /* consecutive dup acks recd */`
54			`u_int t_maxseg; /* maximum segment size */`
55			`u_int t_maxopd; /* mss plus options */`
56			`int t_force; /* 1 if forcing out a byte */`
57			`u_int t_flags;`
58			`#define TF_ACKNOW 0x0001 /* ack peer immediately */`
59			`#define TF_DELACK 0x0002 /* ack, but try to delay it */`
60			`#define TF_NODELAY 0x0004 /* don't delay packets to coalesce */`
61			`#define TF_NOOPT 0x0008 /* don't use tcp options */`
62			`#define TF_SENTFIN 0x0010 /* have sent FIN */`
63			`#define TF_REQ_SCALE 0x0020 /* have/will request window scaling */`
64			`#define TF_RCVD_SCALE 0x0040 /* other side has requested scaling */`
65			`#define TF_REQ_TSTMP 0x0080 /* have/will request timestamps */`
66			`#define TF_RCVD_TSTMP 0x0100 /* a timestamp was received in SYN */`
67			`#define TF_SACK_PERMIT 0x0200 /* other side said I could SACK */`
68			`#define TF_NEEDSYN 0x0400 /* send SYN (implicit state) */`
69			`#define TF_NEEDFIN 0x0800 /* send FIN (implicit state) */`
70			`#define TF_NOPUSH 0x1000 /* don't push */`
71			`#define TF_REQ_CC 0x2000 /* have/will request CC */`
72			`#define TF_RCVD_CC 0x4000 /* a CC was received in SYN */`
73			`#define TF_SENDCCNEW 0x8000 /* send CCnew instead of CC in SYN */`
74
75			`struct tcpiphdr t_template; / skeletal packet for transmit */`
76			`struct inpcb t_inpcb; / back pointer to internet pcb */`
77			`/*`
78			`* The following fields are used as in the protocol specification.`
79			`* See RFC783, Dec. 1981, page 21.`
80			`*/`
81			`/* send sequence variables */`
82			`tcp_seq snd_una; /* send unacknowledged */`
83			`tcp_seq snd_nxt; /* send next */`
84			`tcp_seq snd_up; /* send urgent pointer */`
85			`tcp_seq snd_wl1; /* window update seg seq number */`
86			`tcp_seq snd_wl2; /* window update seg ack number */`
87			`tcp_seq iss; /* initial send sequence number */`
88			`u_long snd_wnd; /* send window */`
89			`/* receive sequence variables */`
90			`u_long rcv_wnd; /* receive window */`
91			`tcp_seq rcv_nxt; /* receive next */`
92			`tcp_seq rcv_up; /* receive urgent pointer */`
93			`tcp_seq irs; /* initial receive sequence number */`
94			`/*`
95			`* Additional variables for this implementation.`
96			`*/`
97			`/* receive variables */`
98			`tcp_seq rcv_adv; /* advertised window */`
99			`/* retransmit variables */`
100			`tcp_seq snd_max; /* highest sequence number sent;`
101			`* used to recognize retransmits`
102			`*/`
103			`/* congestion control (for slow start, source quench, retransmit after loss) */`
104			`u_long snd_cwnd; /* congestion-controlled window */`
105			`u_long snd_ssthresh; /* snd_cwnd size threshold for`
106			`* for slow start exponential to`
107			`* linear switch`
108			`*/`
109			`/*`
110			`* transmit timing stuff. See below for scale of srtt and rttvar.`
111			`* "Variance" is actually smoothed difference.`
112			`*/`
113			`u_int t_idle; /* inactivity time */`
114			`int t_rtt; /* round trip time */`
115			`tcp_seq t_rtseq; /* sequence number being timed */`
116			`int t_srtt; /* smoothed round-trip time */`
117			`int t_rttvar; /* variance in round-trip time */`
118			`u_int t_rttmin; /* minimum rtt allowed */`
119			`u_long max_sndwnd; /* largest window peer has offered */`
120
121			`/* out-of-band data */`
122			`char t_oobflags; /* have some */`
123			`char t_iobc; /* input character */`
124			`#define TCPOOB_HAVEDATA 0x01`
125			`#define TCPOOB_HADDATA 0x02`
126			`int t_softerror; /* possible error not yet reported */`
127
128			`/* RFC 1323 variables */`
129			`u_char snd_scale; /* window scaling for send window */`
130			`u_char rcv_scale; /* window scaling for recv window */`
131			`u_char request_r_scale; /* pending window scaling */`
132			`u_char requested_s_scale;`
133			`u_long ts_recent; /* timestamp echo data */`
134			`u_long ts_recent_age; /* when last updated */`
135			`tcp_seq last_ack_sent;`
136			`/* RFC 1644 variables */`
137			`tcp_cc cc_send; /* send connection count */`
138			`tcp_cc cc_recv; /* receive connection count */`
139			`u_long t_duration; /* connection duration */`
140
141			`/* TUBA stuff */`
142			`caddr_t t_tuba_pcb; /* next level down pcb for TCP over z */`
143			`/* More RTT stuff */`
144			`u_long t_rttupdated; /* number of times rtt sampled */`
145			`};`
146
147			`/*`
148			`* Structure to hold TCP options that are only used during segment`
149			`* processing (in tcp_input), but not held in the tcpcb.`
150			`* It's basically used to reduce the number of parameters`
151			`* to tcp_dooptions.`
152			`*/`
153			`struct tcpopt {`
154			`u_long to_flag; /* which options are present */`
155			`#define TOF_TS 0x0001 /* timestamp */`
156			`#define TOF_CC 0x0002 /* CC and CCnew are exclusive */`
157			`#define TOF_CCNEW 0x0004`
158			`#define TOF_CCECHO 0x0008`
159			`u_long to_tsval;`
160			`u_long to_tsecr;`
161			`tcp_cc to_cc; /* holds CC or CCnew */`
162			`tcp_cc to_ccecho;`
163			`};`
164
165			`/*`
166			`* The TAO cache entry which is stored in the protocol family specific`
167			`* portion of the route metrics.`
168			`*/`
169			`struct rmxp_tao {`
170			`tcp_cc tao_cc; /* latest CC in valid SYN */`
171			`tcp_cc tao_ccsent; /* latest CC sent to peer */`
172			`u_short tao_mssopt; /* peer's cached MSS */`
173			`#ifdef notyet`
174			`u_short tao_flags; /* cache status flags */`
175			`#define TAOF_DONT 0x0001 /* peer doesn't understand rfc1644 */`
176			`#define TAOF_OK 0x0002 /* peer does understand rfc1644 */`
177			`#define TAOF_UNDEF 0 /* we don't know yet */`
178			`#endif /* notyet */`
179			`};`
180			`#define rmx_taop(r) ((struct rmxp_tao *)(r).rmx_filler)`
181
182			`#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)`
183			`#define sototcpcb(so) (intotcpcb(sotoinpcb(so)))`
184
185			`/*`
186			`* The smoothed round-trip time and estimated variance`
187			`* are stored as fixed point numbers scaled by the values below.`
188			`* For convenience, these scales are also used in smoothing the average`
189			`* (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).`
190			`* With these scales, srtt has 3 bits to the right of the binary point,`
191			`* and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the`
192			`* binary point, and is smoothed with an ALPHA of 0.75.`
193			`*/`
194			`#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */`
195			`#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */`
196			`#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */`
197			`#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */`
198			`#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */`
199
200			`/*`
201			`* The initial retransmission should happen at rtt + 4 * rttvar.`
202			`* Because of the way we do the smoothing, srtt and rttvar`
203			`* will each average +1/2 tick of bias. When we compute`
204			`* the retransmit timer, we want 1/2 tick of rounding and`
205			`* 1 extra tick because of +-1/2 tick uncertainty in the`
206			`* firing of the timer. The bias will give us exactly the`
207			`* 1.5 tick we need. But, because the bias is`
208			`* statistical, we have to test that we don't drop below`
209			`* the minimum feasible timer (which is 2 ticks).`
210			`* This version of the macro adapted from a paper by Lawrence`
211			`* Brakmo and Larry Peterson which outlines a problem caused`
212			`* by insufficient precision in the original implementation,`
213			`* which results in inappropriately large RTO values for very`
214			`* fast networks.`
215			`*/`
216			`#define TCP_REXMTVAL(tp) \`
217			`((((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \`
218			`+ (tp)->t_rttvar) >> TCP_DELTA_SHIFT)`
219
220			`/* XXX`
221			`* We want to avoid doing m_pullup on incoming packets but that`
222			`* means avoiding dtom on the tcp reassembly code. That in turn means`
223			`* keeping an mbuf pointer in the reassembly queue (since we might`
224			`* have a cluster). As a quick hack, the source & destination`
225			`* port numbers (which are no longer needed once we've located the`
226			`* tcpcb) are overlayed with an mbuf pointer.`
227			`*/`
228			`#define REASS_MBUF(ti) ((struct mbuf *)&((ti)->ti_t))`
229
230			`/*`
231			`* TCP statistics.`
232			`* Many of these should be kept per connection,`
233			`* but that's inconvenient at the moment.`
234			`*/`
235			`struct tcpstat {`
236			`u_long tcps_connattempt; /* connections initiated */`
237			`u_long tcps_accepts; /* connections accepted */`
238			`u_long tcps_connects; /* connections established */`
239			`u_long tcps_drops; /* connections dropped */`
240			`u_long tcps_conndrops; /* embryonic connections dropped */`
241			`u_long tcps_closed; /* conn. closed (includes drops) */`
242			`u_long tcps_segstimed; /* segs where we tried to get rtt */`
243			`u_long tcps_rttupdated; /* times we succeeded */`
244			`u_long tcps_delack; /* delayed acks sent */`
245			`u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */`
246			`u_long tcps_rexmttimeo; /* retransmit timeouts */`
247			`u_long tcps_persisttimeo; /* persist timeouts */`
248			`u_long tcps_keeptimeo; /* keepalive timeouts */`
249			`u_long tcps_keepprobe; /* keepalive probes sent */`
250			`u_long tcps_keepdrops; /* connections dropped in keepalive */`
251
252			`u_long tcps_sndtotal; /* total packets sent */`
253			`u_long tcps_sndpack; /* data packets sent */`
254			`u_long tcps_sndbyte; /* data bytes sent */`
255			`u_long tcps_sndrexmitpack; /* data packets retransmitted */`
256			`u_long tcps_sndrexmitbyte; /* data bytes retransmitted */`
257			`u_long tcps_sndacks; /* ack-only packets sent */`
258			`u_long tcps_sndprobe; /* window probes sent */`
259			`u_long tcps_sndurg; /* packets sent with URG only */`
260			`u_long tcps_sndwinup; /* window update-only packets sent */`
261			`u_long tcps_sndctrl; /* control (SYN\|FIN\|RST) packets sent */`
262
263			`u_long tcps_rcvtotal; /* total packets received */`
264			`u_long tcps_rcvpack; /* packets received in sequence */`
265			`u_long tcps_rcvbyte; /* bytes received in sequence */`
266			`u_long tcps_rcvbadsum; /* packets received with ccksum errs */`
267			`u_long tcps_rcvbadoff; /* packets received with bad offset */`
268			`u_long tcps_rcvshort; /* packets received too short */`
269			`u_long tcps_rcvduppack; /* duplicate-only packets received */`
270			`u_long tcps_rcvdupbyte; /* duplicate-only bytes received */`
271			`u_long tcps_rcvpartduppack; /* packets with some duplicate data */`
272			`u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */`
273			`u_long tcps_rcvoopack; /* out-of-order packets received */`
274			`u_long tcps_rcvoobyte; /* out-of-order bytes received */`
275			`u_long tcps_rcvpackafterwin; /* packets with data after window */`
276			`u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */`
277			`u_long tcps_rcvafterclose; /* packets rcvd after "close" */`
278			`u_long tcps_rcvwinprobe; /* rcvd window probe packets */`
279			`u_long tcps_rcvdupack; /* rcvd duplicate acks */`
280			`u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */`
281			`u_long tcps_rcvackpack; /* rcvd ack packets */`
282			`u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */`
283			`u_long tcps_rcvwinupd; /* rcvd window update packets */`
284			`u_long tcps_pawsdrop; /* segments dropped due to PAWS */`
285			`u_long tcps_predack; /* times hdr predict ok for acks */`
286			`u_long tcps_preddat; /* times hdr predict ok for data pkts */`
287			`u_long tcps_pcbcachemiss;`
288			`u_long tcps_cachedrtt; /* times cached RTT in route updated */`
289			`u_long tcps_cachedrttvar; /* times cached rttvar updated */`
290			`u_long tcps_cachedssthresh; /* times cached ssthresh updated */`
291			`u_long tcps_usedrtt; /* times RTT initialized from route */`
292			`u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */`
293			`u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/`
294			`u_long tcps_persistdrop; /* timeout in persist state */`
295			`u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */`
296			`u_long tcps_mturesent; /* resends due to MTU discovery */`
297			`u_long tcps_listendrop; /* listen queue overflows */`
298			`};`
299
300			`/*`
301			`* Names for TCP sysctl objects`
302			`*/`
303			`#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */`
304			`#define TCPCTL_DO_RFC1644 2 /* use RFC-1644 extensions */`
305			`#define TCPCTL_MSSDFLT 3 /* MSS default */`
306			`#define TCPCTL_STATS 4 /* statistics (read-only) */`
307			`#define TCPCTL_RTTDFLT 5 /* default RTT estimate */`
308			`#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */`
309			`#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */`
310			`#define TCPCTL_SENDSPACE 8 /* send buffer space */`
311			`#define TCPCTL_RECVSPACE 9 /* receive buffer space */`
312			`#define TCPCTL_KEEPINIT 10 /* receive buffer space */`
313			`#define TCPCTL_MAXID 11`
314
315			`#define TCPCTL_NAMES { \`
316			`{ 0, 0 }, \`
317			`{ "rfc1323", CTLTYPE_INT }, \`
318			`{ "rfc1644", CTLTYPE_INT }, \`
319			`{ "mssdflt", CTLTYPE_INT }, \`
320			`{ "stats", CTLTYPE_STRUCT }, \`
321			`{ "rttdflt", CTLTYPE_INT }, \`
322			`{ "keepidle", CTLTYPE_INT }, \`
323			`{ "keepintvl", CTLTYPE_INT }, \`
324			`{ "sendspace", CTLTYPE_INT }, \`
325			`{ "recvspace", CTLTYPE_INT }, \`
326			`{ "keepinit", CTLTYPE_INT }, \`
327			`}`
328
329			`#ifdef KERNEL`
330			`extern struct inpcbhead tcb; /* head of queue of active tcpcb's */`
331			`extern struct inpcbinfo tcbinfo;`
332			`extern struct tcpstat tcpstat; /* tcp statistics */`
333			`extern int tcp_mssdflt; /* XXX */`
334			`extern u_long tcp_now; /* for RFC 1323 timestamps */`
335
336			`void tcp_canceltimers __P((struct tcpcb *));`
337			`struct tcpcb *`
338			`tcp_close __P((struct tcpcb *));`
339			`void tcp_ctlinput __P((int, struct sockaddr , void ));`
340			`int tcp_ctloutput __P((int, struct socket , int, int, struct mbuf *));`
341			`struct tcpcb *`
342			`tcp_drop __P((struct tcpcb *, int));`
343			`void tcp_drain __P((void));`
344			`void tcp_fasttimo __P((void));`
345			`struct rmxp_tao *`
346			`tcp_gettaocache __P((struct inpcb *));`
347			`void tcp_init __P((void));`
348			`void tcp_input __P((struct mbuf *, int));`
349			`void tcp_mss __P((struct tcpcb *, int));`
350			`int tcp_mssopt __P((struct tcpcb *));`
351			`void tcp_mtudisc __P((struct inpcb *, int));`
352			`struct tcpcb *`
353			`tcp_newtcpcb __P((struct inpcb *));`
354			`int tcp_output __P((struct tcpcb *));`
355			`void tcp_quench __P((struct inpcb *, int));`
356			`void tcp_respond __P((struct tcpcb *,`
357			`struct tcpiphdr , struct mbuf , u_long, u_long, int));`
358			`struct rtentry *`
359			`tcp_rtlookup __P((struct inpcb *));`
360			`void tcp_setpersist __P((struct tcpcb *));`
361			`void tcp_slowtimo __P((void));`
362			`struct tcpiphdr *`
363			`tcp_template __P((struct tcpcb *));`
364			`struct tcpcb *`
365			`tcp_timers __P((struct tcpcb *, int));`
366			`void tcp_trace __P((int, int, struct tcpcb , struct tcpiphdr , int));`
367
368			`extern struct pr_usrreqs tcp_usrreqs;`
369			`extern u_long tcp_sendspace;`
370			`extern u_long tcp_recvspace;`
371
372			`#endif /* KERNEL */`
373
374			`#endif /* _NETINET_TCP_VAR_H_ */`