bug: don't soisdisconnected on datagram sockets, want to reconnect

[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 c97a293..53731c8 100644 (file)
--- a/usr/src/sys/netinet/tcp.h
+++ b/usr/src/sys/netinet/tcp.h
@@ -1,24 +1,54 @@
-/* tcp.h 1.16 81/11/15 */
+/*
+ * Copyright (c) 1982 Regents of the University of California.
+ * All rights reserved.  The Berkeley software License Agreement
+ * specifies the terms and conditions for redistribution.
+ *
+ *     @(#)tcp.h       6.5 (Berkeley) %G%
+ */

 
 

+typedef        u_long  tcp_seq;

 /*
  * TCP header.
 /*
  * TCP header.

+ * Per RFC 793, September, 1981.

  */
 struct tcphdr {
        u_short th_sport;               /* source port */
        u_short th_dport;               /* destination port */
  */
 struct tcphdr {
        u_short th_sport;               /* source port */
        u_short th_dport;               /* destination port */

-       seq_t   th_seq;                 /* sequence number */
-       seq_t   th_ackno;               /* acknowledgement number */
-       u_char
-               th_x2:4,                /* (unused) */
+       tcp_seq th_seq;                 /* sequence number */
+       tcp_seq th_ack;                 /* acknowledgement number */
+#ifdef vax
+       u_char  th_x2:4,                /* (unused) */

                th_off:4;               /* data offset */
                th_off:4;               /* data offset */

+#endif

        u_char  th_flags;
        u_char  th_flags;

-#define        TH_FIN  001
-#define        TH_SYN  002
-#define        TH_RST  004
-#define        TH_EOL  010
-#define        TH_ACK  020
-#define        TH_URG  040
+#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 */
 };
        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
+
+/*
+ * 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 */