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reorganization to move ufsmount ops to be vnode ops;
[unix-history] / usr / src / sys / netinet / tcp.h
diff --git a/usr/src/sys/netinet/tcp.h b/usr/src/sys/netinet/tcp.h
index 4bf56c1..eae3c64 100644 (file)
--- a/usr/src/sys/netinet/tcp.h
+++ b/usr/src/sys/netinet/tcp.h
@@ -1,142 +1,73 @@
-/* tcp.h 1.3 81/10/21 */
-
 /*
 /*
- * Tcp header (fits over ip header).
+ * Copyright (c) 1982, 1986 Regents of the University of California.
+ * All rights reserved.
+ *
+ * %sccs.include.redist.c%
+ *
+ *     @(#)tcp.h       7.7 (Berkeley) %G%
  */
  */
-struct th {
-       struct  th *t_next;             /* -> next tcp on rcv chain */
-       struct  th *t_prev;             /* -> prev tcp on rcv chain */
-       u_char  t_x1;                   /* (unused) */
-       u_char  t_pr;                   /* protocol */
-       u_short t_len;                  /* seg length */
-       struct  socket t_s;             /* source internet address */
-       struct  socket t_d;             /* destination internet address */
-       u_short t_src;                  /* source port */
-       u_short t_dst;                  /* destination port */
-       seq_t   t_seq;                  /* sequence number */
-       seq_t   t_ackno;                /* acknowledgement number */
-#define        t_end(x) (x->t_seq + x->t_len - 1)
-       u_char
-               t_x2:4,                 /* (unused) */
-               t_off:4;                /* data offset */
-       u_char
-               t_fin:1,                /* fin flag */
-               t_syn:1,                /* syn flag */
-               t_rst:1,                /* reset flag */
-               t_eol:1,                /* eol flag */
-               t_ack:1,                /* ack flag */
-               t_urg:1,                /* urgent flag */
-               t_x3:2;                 /* (unused) */
-       u_short t_win;                  /* window */
-       u_short t_sum;                  /* checksum */
-       u_short t_urp;                  /* urgent pointer */
-};
-
+#ifndef BYTE_ORDER
 /*
 /*
- * Tcp control block.
+ * Definitions for byte order,
+ * according to byte significance from low address to high.
  */
  */
-struct tcb {
-       struct  th *t_rcv_next;         /* first el on rcv queue */
-       struct  th *t_rcv_prev;         /* last el on rcv queue */
-       struct  tcb *t_tcb_next;        /* next tcb */
-       struct  tcb *t_tcb_prev;        /* next tcb */
-       struct  ucb *t_ucb;             /* ucb */
-       struct  mbuf *t_rcv_unack;      /* unacked message queue */
-       seq_t   iss;                    /* initial send seq # */
-       seq_t   irs;                    /* initial recv seq # */
-       seq_t   rcv_urp;                /* rcv urgent pointer */
-       seq_t   rcv_nxt;                /* next seq # to rcv */
-       seq_t   rcv_end;                /* rcv eol pointer */
-       seq_t   snd_off;                /* seq # of first datum in send buf */
-       seq_t   seq_fin;                /* seq # of FIN sent */
-       seq_t   snd_end;                /* send eol pointer */
-       seq_t   snd_urp;                /* snd urgent pointer */
-       seq_t   snd_lst;                /* seq # of last sent datum */
-       seq_t   snd_nxt;                /* seq # of next datum to send */
-       seq_t   snd_una;                /* seq # of first unacked datum */
-       seq_t   snd_wl;                 /* seq # of last sent window */
-       seq_t   snd_hi;                 /* highest seq # sent */
-       seq_t   snd_wnd;                /* send window max */
-       seq_t   t_rexmt_val;            /* val saved in rexmt timer */
-       seq_t   t_rtl_val;              /* val saved in rexmt too long timer */
-       seq_t   t_xmt_val;              /* seq # sent when xmt timer started */
-
-       /* various flags and state variables */
-
-       u_short
-               ack_due:1,              /* must we send ACK */
-               cancelled:1,            /* retransmit timer cancelled */
-               dropped_txt:1,          /* dropped incoming data */
-               fin_rcvd:1,             /* FIN received */
-               force_one:1,            /* force sending of one byte */
-               new_window:1,           /* received new window size */
-               rexmt:1,                /* this msg is a retransmission */
-               snd_fin:1,              /* FIN should be sent */
-               snd_rst:1,              /* RST should be sent */
-               snd_urg:1,              /* urgent data to send */
-               syn_acked:1,            /* SYN has been ACKed */
-               syn_rcvd:1,             /* SYN has been received */
-               usr_closed:1,           /* user has closed connection */
-               waited_2_ml:1,          /* wait time for FIN ACK is up */
-               net_keep:1,             /* don't free this net input */
-               usr_abort:1;            /* user has closed and does not expect
-                                          to receive any more data */
-       u_short t_lport;                /* local port */
-       u_short t_fport;                /* foreign port */
-       u_char  t_state;                /* state of this connection */
-       u_char  t_xmtime;               /* current rexmt time */
-
-       /* timers */
+#define        LITTLE_ENDIAN   1234    /* least-significant byte first (vax) */
+#define        BIG_ENDIAN      4321    /* most-significant byte first (IBM, net) */
+#define        PDP_ENDIAN      3412    /* LSB first in word, MSW first in long (pdp) */
 
 
-       u_char  t_init;                 /* initialization too long */
-       u_char  t_rexmt;                /* retransmission */
-       u_char  t_rexmttl;              /* retransmit too long */
-       u_char  t_persist;              /* retransmit persistance */
-       u_char  t_finack;               /* fin acknowledged */
-       u_char  t_xmt;                  /* round trip transmission time */
-};
-
-#define        ISSINCR         128             /* increment for iss each second */
-#define        TCPROTO         6               /* TCP-4 protocol number */
-#define        TCPSIZE         20              /* size of TCP leader (bytes) */
-#define        T_2ML           10              /* 2*maximum packet lifetime */
-#define        T_PERS          5               /* persist time */
-#define        T_INIT          30              /* init too long timeout */
-#define        T_REXMT         1               /* base for retransmission time */
-#define        T_REXMTTL       30              /* retransmit too long timeout */
-#define        T_REMAX         30              /* maximum retransmission time */
-#define        ACTIVE          1               /* active open */
-#define        PASSIVE         0               /* passive open */
+#ifdef vax
+#define        BYTE_ORDER      LITTLE_ENDIAN
+#else
+#define        BYTE_ORDER      BIG_ENDIAN      /* mc68000, tahoe, most others */
+#endif
+#endif BYTE_ORDER
 
 
+typedef        u_long  tcp_seq;
 /*
 /*
- * Tcp debugging record.
+ * TCP header.
+ * Per RFC 793, September, 1981.
  */
  */
-struct t_debug {
-       long    t_tod;                  /* time of day */
-       struct  tcb *t_tcb;             /* -> tcb */
-       char    t_old;                  /* old state */
-       char    t_inp;                  /* input */
-       char    t_tim;                  /* timer id */
-       char    t_new;                  /* new state */
-       seq_t   t_sno;                  /* seq_t number */
-       seq_t   t_ano;                  /* acknowledgement */
-       u_short t_wno;                  /* window */
-       u_short t_lno;                  /* length */
-       u_char  t_flg;                  /* message flags */
+struct tcphdr {
+       u_short th_sport;               /* source port */
+       u_short th_dport;               /* destination port */
+       tcp_seq th_seq;                 /* sequence number */
+       tcp_seq th_ack;                 /* acknowledgement number */
+#if BYTE_ORDER == LITTLE_ENDIAN
+       u_char  th_x2:4,                /* (unused) */
+               th_off:4;               /* data offset */
+#endif
+#if BYTE_ORDER == BIG_ENDIAN
+       u_char  th_off:4,               /* data offset */
+               th_x2:4;                /* (unused) */
+#endif
+       u_char  th_flags;
+#define        TH_FIN  0x01
+#define        TH_SYN  0x02
+#define        TH_RST  0x04
+#define        TH_PUSH 0x08
+#define        TH_ACK  0x10
+#define        TH_URG  0x20
+       u_short th_win;                 /* window */
+       u_short th_sum;                 /* checksum */
+       u_short th_urp;                 /* urgent pointer */
 };
 
 };
 
+#define        TCPOPT_EOL      0
+#define        TCPOPT_NOP      1
+#define        TCPOPT_MAXSEG   2
+
 /*
 /*
- * Tcp machine predicates
+ * Default maximum segment size for TCP.
+ * With an IP MSS of 576, this is 536,
+ * but 512 is probably more convenient.
+ * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
  */
  */
-#define        ack_ok(x, y) \
-    (!(y)->t_ack || ((x)->iss < (y)->t_ackno && (y)->t_ackno <= (x)->snd_hi))
+#define        TCP_MSS 512
 
 
-#define        syn_ok(x, y) \
-    ((y)->t_syn)
+#define        TCP_MAXWIN      65535           /* largest value for window */
 
 
-#define        ack_fin(x, y) \
-    ((x)->seq_fin > (x)->iss && (y)->t_ackno > (x)->seq_fin)
-
-#define        rcv_empty(x) \
-    ((x)->usr_abort || \
-      ((x)->t_ucb->uc_rbuf == NULL && (x)->t_rcv_next == (x)->t_rcv_prev))
+/*
+ * User-settable options (used with setsockopt).
+ */
+#define        TCP_NODELAY     0x01    /* don't delay send to coalesce packets */
+#define        TCP_MAXSEG      0x02    /* set maximum segment size */
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.