can't reset it if not set up

[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 ff89234..03bbc4f 100644 (file)
--- a/usr/src/sys/netinet/tcp.h
+++ b/usr/src/sys/netinet/tcp.h
@@ -1,114 +1,58 @@
-/* tcp.h 1.1 81/10/14 */
-struct th {                     /* tcp header (fits over ip header) */
-       struct th *t_next;              /* -> next tcp on rcv chain */
-       struct th *t_prev;              /* -> prev tcp on rcv chain */
-       unsigned char t_x1;             /* (unused) */
-       unsigned char t_pr;             /* protocol */
-       unsigned short t_len;           /* seg length */
-       struct socket t_s;              /* source internet address */
-       struct socket t_d;              /* destination internet address */
-       unsigned short t_src;           /* source port */
-       unsigned short t_dst;           /* destination port */
-       sequence t_seq;                 /* sequence number */
-       sequence t_ackno;               /* acknowledgement number */
-#define t_end(x) (x->t_seq + x->t_len - 1)
-       unsigned char
-               t_x2:4,                 /* (unused) */
-               t_off:4;                /* data offset */
-       unsigned 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) */
-       unsigned short t_win;           /* window */
-       unsigned short t_sum;           /* checksum */
-       unsigned short t_urp;           /* urgent pointer */
+/*
+ * Copyright (c) 1982, 1986 Regents of the University of California.
+ * All rights reserved.  The Berkeley software License Agreement
+ * specifies the terms and conditions for redistribution.
+ *
+ *     @(#)tcp.h       7.2 (Berkeley) %G%
+ */
+
+typedef        u_long  tcp_seq;
+/*
+ * TCP header.
+ * Per RFC 793, September, 1981.
+ */
+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 ENDIAN == LITTLE
+       u_char  th_x2:4,                /* (unused) */
+               th_off:4;               /* data offset */
+#endif
+#if ENDIAN == BIG
+       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 */

 };
 
 };
 

-struct tcb {                    /* tcp control block */
-
-       /* various pointers */
-
-       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;         /* -> prev tcb */
-       struct ucb *t_ucb;              /* -> ucb */
-       struct mbuf *t_rcv_unack;       /* -> unacked message queue */
-
-       /* sequence number variables */
-
-       sequence iss;                   /* initial send seq # */
-       sequence irs;                   /* initial recv seq # */
-       sequence rcv_urp;               /* rcv urgent pointer */
-       sequence rcv_nxt;               /* next seq # to rcv */
-       sequence rcv_end;               /* rcv eol pointer */
-       sequence snd_off;               /* seq # of first datum in send buf */
-       sequence seq_fin;               /* seq # of FIN sent */
-       sequence snd_end;               /* send eol pointer */
-       sequence snd_urp;               /* snd urgent pointer */
-       sequence snd_lst;               /* seq # of last sent datum */
-       sequence snd_nxt;               /* seq # of next datum to send */
-       sequence snd_una;               /* seq # of first unacked datum */
-       sequence snd_wl;                /* seq # of last sent window */
-       sequence snd_hi;                /* highest seq # sent */
-       sequence snd_wnd;               /* send window max */
-       sequence t_rexmt_val;           /* value saved in rexmt timer */
-       sequence t_rtl_val;             /* value saved in rexmt too long timer */
-       sequence t_xmt_val;             /* seq # sent when xmt timer started */
-
-       /* various flags and state variables */
-
-       unsigned 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 */
-
-       unsigned short t_flag2;         /* (unused) */
-       unsigned short t_lport;         /* local port */
-       unsigned short t_fport;         /* foreign port */
-       unsigned char t_state;          /* state of this connection */
-       unsigned char t_xmtime;         /* current rexmt time */
-       unsigned char t_sec;            /* security */
-       unsigned char t_prec;           /* precedence */
-       unsigned char t_compt;          /* compartment */
-
-       /* timers */
-
-       unsigned char t_init;           /* initialization too long */
-       unsigned char t_rexmt;          /* retransmission */
-       unsigned char t_rexmttl;        /* retransmit too long */
-       unsigned char t_persist;        /* retransmit persistance */
-       unsigned char t_finack;         /* fin acknowledged */
-       unsigned 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 */
-
+#define        TCPOPT_EOL      0
+#define        TCPOPT_NOP      1
+#define        TCPOPT_MAXSEG   2
+
+/*
+ * Default maximum segment size for TCP.
+ * With an IP MSS of 576, this is 536,
+ * but 512 is probably more convenient.
+ */
+#ifdef lint
+#define        TCP_MSS 536
+#else
+#define        TCP_MSS MIN(512, IP_MSS - sizeof (struct tcpiphdr))
+#endif
+
+/*
+ * 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 */