1 /* 2 * Copyright (c) 1997-1998 by Sun Microsystems, Inc. 3 * All rights reserved. 4 */ 5 6 /* 7 * Copyright (c) 1982, 1986 Regents of the University of California. 8 * All rights reserved. The Berkeley software License Agreement 9 * specifies the terms and conditions for redistribution. 10 */ 11 12 /* 13 * Kernel variables for tcp. 14 */ 15 16 #ifndef _NETINET_TCP_VAR_H 17 #define _NETINET_TCP_VAR_H 18 19 /* tcp_var.h 1.11 88/08/19 SMI; from UCB 7.3 6/30/87 */ 20 21 #ifdef __cplusplus 22 extern "C" { 23 #endif 24 25 /* 26 * Tcp control block, one per tcp; fields: 27 */ 28 struct tcpcb { 29 struct tcpiphdr *seg_next; /* sequencing queue */ 30 struct tcpiphdr *seg_prev; 31 short t_state; /* state of this connection */ 32 short t_timer[TCPT_NTIMERS]; /* tcp timers */ 33 short t_rxtshift; /* log(2) of rexmt exp. backoff */ 34 short t_rxtcur; /* current retransmit value */ 35 short t_dupacks; /* consecutive dup acks recd */ 36 ushort_t t_maxseg; /* maximum segment size */ 37 char t_force; /* 1 if forcing out a byte */ 38 uchar_t t_flags; 39 #define TF_ACKNOW 0x01 /* ack peer immediately */ 40 #define TF_DELACK 0x02 /* ack, but try to delay it */ 41 #define TF_NODELAY 0x04 /* don't delay packets to coalesce */ 42 #define TF_NOOPT 0x08 /* don't use tcp options */ 43 #define TF_SENTFIN 0x10 /* have sent FIN */ 44 struct tcpiphdr *t_template; /* skeletal packet for transmit */ 45 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 46 /* 47 * The following fields are used as in the protocol specification. 48 * See RFC783, Dec. 1981, page 21. 49 */ 50 /* send sequence variables */ 51 tcp_seq snd_una; /* send unacknowledged */ 52 tcp_seq snd_nxt; /* send next */ 53 tcp_seq snd_up; /* send urgent pointer */ 54 tcp_seq snd_wl1; /* window update seg seq number */ 55 tcp_seq snd_wl2; /* window update seg ack number */ 56 tcp_seq iss; /* initial send sequence number */ 57 ushort_t snd_wnd; /* send window */ 58 /* receive sequence variables */ 59 ushort_t rcv_wnd; /* receive window */ 60 tcp_seq rcv_nxt; /* receive next */ 61 tcp_seq rcv_up; /* receive urgent pointer */ 62 tcp_seq irs; /* initial receive sequence number */ 63 /* 64 * Additional variables for this implementation. 65 */ 66 /* receive variables */ 67 tcp_seq rcv_adv; /* advertised window */ 68 /* retransmit variables */ 69 tcp_seq snd_max; /* highest sequence number sent */ 70 /* used to recognize retransmits */ 71 72 /* congestion control (for slow start, source quench, retransmit after loss) */ 73 ushort_t snd_cwnd; /* congestion-controlled window */ 74 ushort_t snd_ssthresh; /* snd_cwnd size threshhold for */ 75 /* for slow start exponential to */ 76 /* 77 * transmit timing stuff. 78 * srtt and rttvar are stored as fixed point; for convenience in smoothing, 79 * srtt has 3 bits to the right of the binary point, rttvar has 2. 80 * "Variance" is actually smoothed difference. 81 */ 82 short t_idle; /* inactivity time */ 83 short t_rtt; /* round trip time */ 84 tcp_seq t_rtseq; /* sequence number being timed */ 85 short t_srtt; /* smoothed round-trip time */ 86 short t_rttvar; /* variance in round-trip time */ 87 ushort_t max_rcvd; /* most peer has sent into window */ 88 ushort_t max_sndwnd; /* largest window peer has offered */ 89 /* out-of-band data */ 90 char t_oobflags; /* have some */ 91 char t_iobc; /* input character */ 92 #define TCPOOB_HAVEDATA 0x01 93 #define TCPOOB_HADDATA 0x02 94 }; 95 96 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 97 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 98 99 /* 100 * TCP statistics. 101 * Many of these should be kept per connection, 102 * but that's inconvenient at the moment. 103 */ 104 struct tcpstat { 105 uint_t tcps_connattempt; /* connections initiated */ 106 uint_t tcps_accepts; /* connections accepted */ 107 uint_t tcps_connects; /* connections established */ 108 uint_t tcps_drops; /* connections dropped */ 109 uint_t tcps_conndrops; /* embryonic connections dropped */ 110 uint_t tcps_closed; /* conn. closed (includes drops) */ 111 uint_t tcps_segstimed; /* segs where we tried to get rtt */ 112 uint_t tcps_rttupdated; /* times we succeeded */ 113 uint_t tcps_delack; /* delayed acks sent */ 114 uint_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 115 uint_t tcps_rexmttimeo; /* retransmit timeouts */ 116 uint_t tcps_persisttimeo; /* persist timeouts */ 117 uint_t tcps_keeptimeo; /* keepalive timeouts */ 118 uint_t tcps_keepprobe; /* keepalive probes sent */ 119 uint_t tcps_keepdrops; /* connections dropped in keepalive */ 120 121 uint_t tcps_sndtotal; /* total packets sent */ 122 uint_t tcps_sndpack; /* data packets sent */ 123 uint_t tcps_sndbyte; /* data bytes sent */ 124 uint_t tcps_sndrexmitpack; /* data packets retransmitted */ 125 uint_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 126 uint_t tcps_sndacks; /* ack-only packets sent */ 127 uint_t tcps_sndprobe; /* window probes sent */ 128 uint_t tcps_sndurg; /* packets sent with URG only */ 129 uint_t tcps_sndwinup; /* window update-only packets sent */ 130 uint_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 131 132 uint_t tcps_rcvtotal; /* total packets received */ 133 uint_t tcps_rcvpack; /* packets received in sequence */ 134 uint_t tcps_rcvbyte; /* bytes received in sequence */ 135 uint_t tcps_rcvbadsum; /* packets received with ccksum errs */ 136 uint_t tcps_rcvbadoff; /* packets received with bad offset */ 137 uint_t tcps_rcvshort; /* packets received too short */ 138 uint_t tcps_rcvduppack; /* duplicate-only packets received */ 139 uint_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 140 uint_t tcps_rcvpartduppack; /* packets with some duplicate data */ 141 uint_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 142 uint_t tcps_rcvoopack; /* out-of-order packets received */ 143 uint_t tcps_rcvoobyte; /* out-of-order bytes received */ 144 uint_t tcps_rcvpackafterwin; /* packets with data after window */ 145 uint_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 146 uint_t tcps_rcvafterclose; /* packets rcvd after "close" */ 147 uint_t tcps_rcvwinprobe; /* rcvd window probe packets */ 148 uint_t tcps_rcvdupack; /* rcvd duplicate acks */ 149 uint_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 150 uint_t tcps_rcvackpack; /* rcvd ack packets */ 151 uint_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 152 uint_t tcps_rcvwinupd; /* rcvd window update packets */ 153 }; 154 155 #define TCP_COMPAT_42 156 157 #ifdef __cplusplus 158 } 159 #endif 160 161 #endif /* _NETINET_TCP_VAR_H */ 162