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Annotation of 43BSDTahoe/sys/netinet/tcp_var.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  *
        !            17:  *     @(#)tcp_var.h   7.8 (Berkeley) 6/29/88
        !            18:  */
        !            19: 
        !            20: /*
        !            21:  * TCP configuration:  This is a half-assed attempt to make TCP
        !            22:  * self-configure for a few varieties of 4.2 and 4.3-based unixes.
        !            23:  * If you don't have a) a 4.3bsd vax or b) a 3.x Sun (x<6), check
        !            24:  * this carefully (it's probably not right).  Please send me mail
        !            25:  * if you run into configuration problems.
        !            26:  *  - Van Jacobson ([email protected])
        !            27:  */
        !            28: 
        !            29: #ifndef BSD
        !            30: #define BSD 42 /* if we're not 4.3, pretend we're 4.2 */
        !            31: #define OLDSTAT        /* set if we have to use old netstat binaries */
        !            32: #endif
        !            33: 
        !            34: /* #define OLDSTAT     /* set if we have to use old netstat binaries */
        !            35: 
        !            36: #if sun || BSD < 43
        !            37: #define TCP_COMPAT_42  /* set if we have to interop w/4.2 systems */
        !            38: #endif
        !            39: 
        !            40: #ifndef SB_MAX
        !            41: #ifdef SB_MAXCOUNT
        !            42: #define        SB_MAX  SB_MAXCOUNT     /* Sun has to be a little bit different... */
        !            43: #else
        !            44: #define SB_MAX 32767           /* XXX */
        !            45: #endif SB_MAXCOUNT
        !            46: #endif SB_MAX
        !            47: 
        !            48: #ifndef IP_MAXPACKET
        !            49: #define        IP_MAXPACKET    65535           /* maximum packet size */
        !            50: #endif
        !            51: 
        !            52: /*
        !            53:  * Bill Nowicki pointed out that the page size (CLBYTES) has
        !            54:  * nothing to do with the mbuf cluster size.  So, we followed
        !            55:  * Sun's lead and made the new define MCLBYTES stand for the mbuf
        !            56:  * cluster size.  The following define makes up backwards compatible
        !            57:  * with 4.3 and 4.2.  If CLBYTES is >1024 on your machine, check
        !            58:  * this against the mbuf cluster definitions in /usr/include/sys/mbuf.h.
        !            59:  */
        !            60: #ifndef MCLBYTES
        !            61: #define        MCLBYTES CLBYTES        /* XXX */
        !            62: #endif
        !            63: 
        !            64: /*
        !            65:  * The routine in_localaddr is broken in Sun's 3.4.  We redefine ours
        !            66:  * (in tcp_input.c) so we use can it but won't have a name conflict.
        !            67:  */
        !            68: #ifdef sun
        !            69: #define in_localaddr tcp_in_localaddr
        !            70: #endif
        !            71: 
        !            72: /* --------------- end of TCP config ---------------- */
        !            73: 
        !            74: /*
        !            75:  * Kernel variables for tcp.
        !            76:  */
        !            77: 
        !            78: /*
        !            79:  * Tcp control block, one per tcp; fields:
        !            80:  */
        !            81: struct tcpcb {
        !            82:        struct  tcpiphdr *seg_next;     /* sequencing queue */
        !            83:        struct  tcpiphdr *seg_prev;
        !            84:        short   t_state;                /* state of this connection */
        !            85:        short   t_timer[TCPT_NTIMERS];  /* tcp timers */
        !            86:        short   t_rxtshift;             /* log(2) of rexmt exp. backoff */
        !            87:        short   t_rxtcur;               /* current retransmit value */
        !            88:        short   t_dupacks;              /* consecutive dup acks recd */
        !            89:        u_short t_maxseg;               /* maximum segment size */
        !            90:        char    t_force;                /* 1 if forcing out a byte */
        !            91:        u_char  t_flags;
        !            92: #define        TF_ACKNOW       0x01            /* ack peer immediately */
        !            93: #define        TF_DELACK       0x02            /* ack, but try to delay it */
        !            94: #define        TF_NODELAY      0x04            /* don't delay packets to coalesce */
        !            95: #define        TF_NOOPT        0x08            /* don't use tcp options */
        !            96: #define        TF_SENTFIN      0x10            /* have sent FIN */
        !            97:        struct  tcpiphdr *t_template;   /* skeletal packet for transmit */
        !            98:        struct  inpcb *t_inpcb;         /* back pointer to internet pcb */
        !            99: /*
        !           100:  * The following fields are used as in the protocol specification.
        !           101:  * See RFC783, Dec. 1981, page 21.
        !           102:  */
        !           103: /* send sequence variables */
        !           104:        tcp_seq snd_una;                /* send unacknowledged */
        !           105:        tcp_seq snd_nxt;                /* send next */
        !           106:        tcp_seq snd_up;                 /* send urgent pointer */
        !           107:        tcp_seq snd_wl1;                /* window update seg seq number */
        !           108:        tcp_seq snd_wl2;                /* window update seg ack number */
        !           109:        tcp_seq iss;                    /* initial send sequence number */
        !           110:        u_short snd_wnd;                /* send window */
        !           111: /* receive sequence variables */
        !           112:        u_short rcv_wnd;                /* receive window */
        !           113:        tcp_seq rcv_nxt;                /* receive next */
        !           114:        tcp_seq rcv_up;                 /* receive urgent pointer */
        !           115:        tcp_seq irs;                    /* initial receive sequence number */
        !           116: /*
        !           117:  * Additional variables for this implementation.
        !           118:  */
        !           119: /* receive variables */
        !           120:        tcp_seq rcv_adv;                /* advertised window */
        !           121: /* retransmit variables */
        !           122:        tcp_seq snd_max;                /* highest sequence number sent
        !           123:                                         * used to recognize retransmits
        !           124:                                         */
        !           125: /* congestion control (for slow start, source quench, retransmit after loss) */
        !           126:        u_short snd_cwnd;               /* congestion-controlled window */
        !           127:        u_short snd_ssthresh;           /* snd_cwnd size threshhold for
        !           128:                                         * for slow start exponential to
        !           129:                                         * linear switch */
        !           130: /*
        !           131:  * transmit timing stuff.
        !           132:  * srtt and rttvar are stored as fixed point; for convenience in smoothing,
        !           133:  * srtt has 3 bits to the right of the binary point, rttvar has 2.
        !           134:  * "Variance" is actually smoothed difference.
        !           135:  */
        !           136:        short   t_idle;                 /* inactivity time */
        !           137:        short   t_rtt;                  /* round trip time */
        !           138:        tcp_seq t_rtseq;                /* sequence number being timed */
        !           139:        short   t_srtt;                 /* smoothed round-trip time */
        !           140:        short   t_rttvar;               /* variance in round-trip time */
        !           141:        u_short max_rcvd;               /* most peer has sent into window */
        !           142:        u_short max_sndwnd;             /* largest window peer has offered */
        !           143: /* out-of-band data */
        !           144:        char    t_oobflags;             /* have some */
        !           145:        char    t_iobc;                 /* input character */
        !           146: #define        TCPOOB_HAVEDATA 0x01
        !           147: #define        TCPOOB_HADDATA  0x02
        !           148: };
        !           149: 
        !           150: #define        intotcpcb(ip)   ((struct tcpcb *)(ip)->inp_ppcb)
        !           151: #define        sototcpcb(so)   (intotcpcb(sotoinpcb(so)))
        !           152: 
        !           153: /*
        !           154:  * TCP statistics.
        !           155:  * Many of these should be kept per connection,
        !           156:  * but that's inconvenient at the moment.
        !           157:  */
        !           158: struct tcpstat {
        !           159: #ifdef OLDSTAT
        !           160:        /*
        !           161:         * Declare statistics the same as in 4.3
        !           162:         * at the start of tcpstat (same size and
        !           163:         * position) for netstat.
        !           164:         */
        !           165:        int     tcps_rcvbadsum;
        !           166:        int     tcps_rcvbadoff;
        !           167:        int     tcps_rcvshort;
        !           168:        int     tcps_badsegs;
        !           169:        int     tcps_unack;
        !           170: #define        tcps_badsum     tcps_rcvbadsum
        !           171: #define        tcps_badoff     tcps_rcvbadoff
        !           172: #define        tcps_hdrops     tcps_rcvshort
        !           173: 
        !           174: #endif OLDSTAT
        !           175:        u_long  tcps_connattempt;       /* connections initiated */
        !           176:        u_long  tcps_accepts;           /* connections accepted */
        !           177:        u_long  tcps_connects;          /* connections established */
        !           178:        u_long  tcps_drops;             /* connections dropped */
        !           179:        u_long  tcps_conndrops;         /* embryonic connections dropped */
        !           180:        u_long  tcps_closed;            /* conn. closed (includes drops) */
        !           181:        u_long  tcps_segstimed;         /* segs where we tried to get rtt */
        !           182:        u_long  tcps_rttupdated;        /* times we succeeded */
        !           183:        u_long  tcps_delack;            /* delayed acks sent */
        !           184:        u_long  tcps_timeoutdrop;       /* conn. dropped in rxmt timeout */
        !           185:        u_long  tcps_rexmttimeo;        /* retransmit timeouts */
        !           186:        u_long  tcps_persisttimeo;      /* persist timeouts */
        !           187:        u_long  tcps_keeptimeo;         /* keepalive timeouts */
        !           188:        u_long  tcps_keepprobe;         /* keepalive probes sent */
        !           189:        u_long  tcps_keepdrops;         /* connections dropped in keepalive */
        !           190: 
        !           191:        u_long  tcps_sndtotal;          /* total packets sent */
        !           192:        u_long  tcps_sndpack;           /* data packets sent */
        !           193:        u_long  tcps_sndbyte;           /* data bytes sent */
        !           194:        u_long  tcps_sndrexmitpack;     /* data packets retransmitted */
        !           195:        u_long  tcps_sndrexmitbyte;     /* data bytes retransmitted */
        !           196:        u_long  tcps_sndacks;           /* ack-only packets sent */
        !           197:        u_long  tcps_sndprobe;          /* window probes sent */
        !           198:        u_long  tcps_sndurg;            /* packets sent with URG only */
        !           199:        u_long  tcps_sndwinup;          /* window update-only packets sent */
        !           200:        u_long  tcps_sndctrl;           /* control (SYN|FIN|RST) packets sent */
        !           201: 
        !           202:        u_long  tcps_rcvtotal;          /* total packets received */
        !           203:        u_long  tcps_rcvpack;           /* packets received in sequence */
        !           204:        u_long  tcps_rcvbyte;           /* bytes received in sequence */
        !           205: #ifndef OLDSTAT
        !           206:        u_long  tcps_rcvbadsum;         /* packets received with ccksum errs */
        !           207:        u_long  tcps_rcvbadoff;         /* packets received with bad offset */
        !           208:        u_long  tcps_rcvshort;          /* packets received too short */
        !           209: #endif
        !           210:        u_long  tcps_rcvduppack;        /* duplicate-only packets received */
        !           211:        u_long  tcps_rcvdupbyte;        /* duplicate-only bytes received */
        !           212:        u_long  tcps_rcvpartduppack;    /* packets with some duplicate data */
        !           213:        u_long  tcps_rcvpartdupbyte;    /* dup. bytes in part-dup. packets */
        !           214:        u_long  tcps_rcvoopack;         /* out-of-order packets received */
        !           215:        u_long  tcps_rcvoobyte;         /* out-of-order bytes received */
        !           216:        u_long  tcps_rcvpackafterwin;   /* packets with data after window */
        !           217:        u_long  tcps_rcvbyteafterwin;   /* bytes rcvd after window */
        !           218:        u_long  tcps_rcvafterclose;     /* packets rcvd after "close" */
        !           219:        u_long  tcps_rcvwinprobe;       /* rcvd window probe packets */
        !           220:        u_long  tcps_rcvdupack;         /* rcvd duplicate acks */
        !           221:        u_long  tcps_rcvacktoomuch;     /* rcvd acks for unsent data */
        !           222:        u_long  tcps_rcvackpack;        /* rcvd ack packets */
        !           223:        u_long  tcps_rcvackbyte;        /* bytes acked by rcvd acks */
        !           224:        u_long  tcps_rcvwinupd;         /* rcvd window update packets */
        !           225: };
        !           226: 
        !           227: #ifdef KERNEL
        !           228: struct inpcb tcb;              /* head of queue of active tcpcb's */
        !           229: struct tcpstat tcpstat;        /* tcp statistics */
        !           230: struct tcpiphdr *tcp_template();
        !           231: struct tcpcb *tcp_close(), *tcp_drop();
        !           232: struct tcpcb *tcp_timers(), *tcp_disconnect(), *tcp_usrclosed();
        !           233: #endif

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