servers/inet/generic/tcp.h

   1 /*
   2 tcp.h
   3
   4 Copyright 1995 Philip Homburg
   5 */
   6
   7 #ifndef TCP_H
   8 #define TCP_H
   9
  10 #define TCP_MAX_DATAGRAM        8192
  11
  12 #ifndef TCP_MAX_SND_WND_SIZE
  13 #define TCP_MAX_SND_WND_SIZE    (32*1024)
  14 #endif
  15
  16 #ifndef TCP_MIN_RCV_WND_SIZE
  17 #define TCP_MIN_RCV_WND_SIZE    (4*1024)
  18 #endif
  19
  20 #ifndef TCP_MAX_RCV_WND_SIZE
  21 #define TCP_MAX_RCV_WND_SIZE    (TCP_MIN_RCV_WND_SIZE + 28*1024)
  22 #endif
  23
  24 #define TCP_DEF_TOS             0
  25 #define TCP_DEF_TTL             5       /* hops/seconds */
  26 #define TCP_DEF_TTL_NEXT        30      /* hops/seconds */
  27
  28 /* An established  TCP connection times out if no communication is possible
  29  * for TCP_DEF_RT_DEAD clock ticks
  30  */
  31 #ifndef TCP_DEF_RT_DEAD
  32 #define TCP_DEF_RT_DEAD         (20L*60*HZ)
  33 #endif
  34
  35 #define TCP_DEF_RT_MAX_CONNECT  (5L*60*HZ) /* 5 minutes in ticks */
  36 #define TCP_DEF_RT_MAX_LISTEN   (1L*60*HZ) /* 1 minute in ticks */
  37 #define TCP_DEF_RT_MAX_CLOSING  (1L*60*HZ) /* 1 minute in ticks */
  38
  39 /* Minimum and maximum intervals for zero window probes. */
  40 #define TCP_0WND_MIN            (HZ)
  41 #define TCP_0WND_MAX            (5*60*HZ)
  42
  43 #define TCP_DEF_RTT             15      /* initial retransmission time in
  44                                          * ticks
  45                                          */
  46 #define TCP_RTT_GRAN            5       /* minimal value of the rtt is
  47                                          * TCP_RTT_GRAN * CLOCK_GRAN
  48                                          */
  49 #define TCP_RTT_MAX             (10*HZ) /* The maximum retransmission interval
  50                                          * is TCP_RTT_MAX ticks
  51                                          */
  52 #define TCP_RTT_SMOOTH           16     /* weight is 15/16 */
  53 #define TCP_DRTT_MULT             4     /* weight of the deviation */
  54 #define TCP_RTT_SCALE           256     /* Scaled values for more accuracy */
  55
  56 #ifndef TCP_DEF_KEEPALIVE
  57 #define TCP_DEF_KEEPALIVE       (20L*60*HZ)     /* Keepalive interval */
  58 #endif
  59
  60 #ifndef TCP_DEF_MSS
  61 #define TCP_DEF_MSS             1400
  62 #endif
  63
  64 #define TCP_MIN_PATH_MTU         500
  65 #define TCP_PMTU_INCR_IV        (1L*60*HZ)      /* 1 minute in ticks */
  66 #define TCP_PMTU_EN_IV          (10L*60*HZ)     /* 10 minutes in ticks */
  67 #define TCP_PMTU_INCR_FRAC      100             /* Add 1% each time */
  68 #define TCP_PMTU_BLACKHOLE      (10*HZ)         /* Assume a PMTU blackhole
  69                                                  * after 10 seconds.
  70                                                  */
  71
  72 #define TCP_DEF_CONF            (NWTC_COPY | NWTC_LP_UNSET | NWTC_UNSET_RA | \
  73                                         NWTC_UNSET_RP)
  74 #define TCP_DEF_OPT             (NWTO_NOFLAG)
  75
  76 #define TCP_DACK_RETRANS        3       /* # dup ACKs to start fast retrans. */
  77
  78 struct acc;
  79
  80 void tcp_prep ARGS(( void ));
  81 void tcp_init ARGS(( void ));
  82 int tcp_open ARGS(( int port, int srfd,
  83         get_userdata_t get_userdata, put_userdata_t put_userdata,
  84         put_pkt_t put_pkt, select_res_t select_res ));
  85 int tcp_read ARGS(( int fd, size_t count));
  86 int tcp_write ARGS(( int fd, size_t count));
  87 int tcp_ioctl ARGS(( int fd, ioreq_t req));
  88 int tcp_cancel ARGS(( int fd, int which_operation ));
  89 void tcp_close ARGS(( int fd));
  90
  91 #endif /* TCP_H */
  92
  93 /*
  94  * $PchId: tcp.h,v 1.17 2005/06/28 14:20:54 philip Exp $
  95  */