net/inet/tcp.h

/* */
This source file includes following definitions.
before
after
between
tcp_connected
   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              Definitions for the TCP module.
   7  *
   8  * Version:     @(#)tcp.h       1.0.5   05/23/93
   9  *
  10  * Authors:     Ross Biro, <bir7@leland.Stanford.Edu>
  11  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12  *
  13  *              This program is free software; you can redistribute it and/or
  14  *              modify it under the terms of the GNU General Public License
  15  *              as published by the Free Software Foundation; either version
  16  *              2 of the License, or (at your option) any later version.
  17  */
  18 #ifndef _TCP_H
  19 #define _TCP_H
  20 
  21 #include <linux/tcp.h>
  22 
  23 #define MAX_SYN_SIZE    44 + sizeof (struct sk_buff) + MAX_HEADER
  24 #define MAX_FIN_SIZE    40 + sizeof (struct sk_buff) + MAX_HEADER
  25 #define MAX_ACK_SIZE    40 + sizeof (struct sk_buff) + MAX_HEADER
  26 #define MAX_RESET_SIZE  40 + sizeof (struct sk_buff) + MAX_HEADER
  27 #define MAX_WINDOW      4096
  28 #define MIN_WINDOW      2048
  29 #define MAX_ACK_BACKLOG 2
  30 #define MIN_WRITE_SPACE 2048
  31 #define TCP_WINDOW_DIFF 2048
  32 
  33 #define TCP_RETR1       7       /*
  34                                  * This is howmany retries it does before it
  35                                  * tries to figure out if the gateway is
  36                                  * down.
  37                                  */
  38 
  39 #define TCP_RETR2       15      /*
  40                                  * This should take at least
  41                                  * 90 minutes to time out.
  42                                  */
  43 
  44 #define TCP_TIMEOUT_LEN 720000  /* should be about 2 hrs                */
  45 #define TCP_TIMEWAIT_LEN 1000   /* how long to wait to sucessfully 
  46                                  * close the socket, about 60 seconds   */
  47 #define TCP_ACK_TIME    3000    /* time to delay before sending an ACK  */
  48 #define TCP_DONE_TIME   250     /* maximum time to wait before actually
  49                                  * destroying a socket                  */
  50 #define TCP_WRITE_TIME  3000    /* initial time to wait for an ACK,
  51                                  * after last transmit                  */
  52 #define TCP_CONNECT_TIME 2000   /* time to retransmit first SYN         */
  53 #define TCP_SYN_RETRIES 5       /* number of times to retry openning a
  54                                  * connection                           */
  55 #define TCP_PROBEWAIT_LEN 100   /* time to wait between probes when
  56                                  * I've got something to write and
  57                                  * there is no window                   */
  58 
  59 #define TCP_NO_CHECK    0       /* turn to one if you want the default
  60                                  * to be no checksum                    */
  61 
  62 #define TCP_WRITE_QUEUE_MAGIC 0xa5f23477
  63 
  64 /*
  65  * The next routines deal with comparing 32 bit unsigned ints
  66  * and worry about wraparound. The general strategy is to do a
  67  * normal compare so long as neither of the numbers is within
  68  * 4K of wrapping.  Otherwise we must check for the wrap.
  69  */
  70 static inline int
  71 before (unsigned long seq1, unsigned long seq2)
     /*  */
  72 {
  73   /* this inequality is strict. */
  74   if (seq1 == seq2) return(0);
  75 
  76   if (seq1 < seq2) {
  77         if ((unsigned long)seq2-(unsigned long)seq1 < 65536UL) {
  78                 return(1);
  79         } else {
  80                 return(0);
  81         }
  82   }
  83 
  84   /*
  85    * Now we know seq1 > seq2.  So all we need to do is check
  86    * to see if seq1 has wrapped.
  87    */
  88   if (seq2 < 8192UL && seq1 > (0xffffffffUL - 8192UL)) {
  89         return(1);
  90   }
  91   return(0);
  92 }
  93 
  94 
  95 static inline int
  96 after(unsigned long seq1, unsigned long seq2)
     /*  */
  97 {
  98   return(before(seq2, seq1));
  99 }
 100 
 101 
 102 /* is s2<=s1<=s3 ? */
 103 static inline int
 104 between(unsigned long seq1, unsigned long seq2, unsigned long seq3)
     /*  */
 105 {
 106   return(after(seq1+1, seq2) && before(seq1, seq3+1));
 107 }
 108 
 109 
 110 /*
 111  * List all states of a TCP socket that can be viewed as a "connected"
 112  * state.  This now includes TCP_SYN_RECV, although I am not yet fully
 113  * convinced that this is the solution for the 'getpeername(2)'
 114  * problem. Thanks to Stephen A. Wood <saw@cebaf.gov>  -FvK
 115  */
 116 static inline const int
 117 tcp_connected(const int state)
     /*  */
 118 {
 119   return(state == TCP_ESTABLISHED || state == TCP_CLOSE_WAIT ||
 120          state == TCP_FIN_WAIT1   || state == TCP_FIN_WAIT2 ||
 121          state == TCP_SYN_RECV);
 122 }
 123 
 124 
 125 extern struct proto tcp_prot;
 126 
 127 
 128 extern void     print_th(struct tcphdr *);
 129 extern void     tcp_err(int err, unsigned char *header, unsigned long daddr,
 130                         unsigned long saddr, struct inet_protocol *protocol);
 131 extern void     tcp_shutdown (struct sock *sk, int how);
 132 extern int      tcp_rcv(struct sk_buff *skb, struct device *dev,
 133                         struct options *opt, unsigned long daddr,
 134                         unsigned short len, unsigned long saddr, int redo,
 135                         struct inet_protocol *protocol);
 136 
 137 extern int      tcp_ioctl(struct sock *sk, int cmd, unsigned long arg);
 138 
 139 
 140 #endif  /* _TCP_H */
/* */
root/net/inet/tcp.h

INCLUDED FROM

DEFINITIONS
