1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * Copyright (c) 1997-1998 by Sun Microsystems, Inc. 3*0Sstevel@tonic-gate * All rights reserved. 4*0Sstevel@tonic-gate */ 5*0Sstevel@tonic-gate 6*0Sstevel@tonic-gate /* 7*0Sstevel@tonic-gate * Copyright (c) 1982, 1986 Regents of the University of California. 8*0Sstevel@tonic-gate * All rights reserved. The Berkeley software License Agreement 9*0Sstevel@tonic-gate * specifies the terms and conditions for redistribution. 10*0Sstevel@tonic-gate */ 11*0Sstevel@tonic-gate 12*0Sstevel@tonic-gate /* 13*0Sstevel@tonic-gate * Kernel variables for tcp. 14*0Sstevel@tonic-gate */ 15*0Sstevel@tonic-gate 16*0Sstevel@tonic-gate #ifndef _NETINET_TCP_VAR_H 17*0Sstevel@tonic-gate #define _NETINET_TCP_VAR_H 18*0Sstevel@tonic-gate 19*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 20*0Sstevel@tonic-gate /* tcp_var.h 1.11 88/08/19 SMI; from UCB 7.3 6/30/87 */ 21*0Sstevel@tonic-gate 22*0Sstevel@tonic-gate #ifdef __cplusplus 23*0Sstevel@tonic-gate extern "C" { 24*0Sstevel@tonic-gate #endif 25*0Sstevel@tonic-gate 26*0Sstevel@tonic-gate /* 27*0Sstevel@tonic-gate * Tcp control block, one per tcp; fields: 28*0Sstevel@tonic-gate */ 29*0Sstevel@tonic-gate struct tcpcb { 30*0Sstevel@tonic-gate struct tcpiphdr *seg_next; /* sequencing queue */ 31*0Sstevel@tonic-gate struct tcpiphdr *seg_prev; 32*0Sstevel@tonic-gate short t_state; /* state of this connection */ 33*0Sstevel@tonic-gate short t_timer[TCPT_NTIMERS]; /* tcp timers */ 34*0Sstevel@tonic-gate short t_rxtshift; /* log(2) of rexmt exp. backoff */ 35*0Sstevel@tonic-gate short t_rxtcur; /* current retransmit value */ 36*0Sstevel@tonic-gate short t_dupacks; /* consecutive dup acks recd */ 37*0Sstevel@tonic-gate ushort_t t_maxseg; /* maximum segment size */ 38*0Sstevel@tonic-gate char t_force; /* 1 if forcing out a byte */ 39*0Sstevel@tonic-gate uchar_t t_flags; 40*0Sstevel@tonic-gate #define TF_ACKNOW 0x01 /* ack peer immediately */ 41*0Sstevel@tonic-gate #define TF_DELACK 0x02 /* ack, but try to delay it */ 42*0Sstevel@tonic-gate #define TF_NODELAY 0x04 /* don't delay packets to coalesce */ 43*0Sstevel@tonic-gate #define TF_NOOPT 0x08 /* don't use tcp options */ 44*0Sstevel@tonic-gate #define TF_SENTFIN 0x10 /* have sent FIN */ 45*0Sstevel@tonic-gate struct tcpiphdr *t_template; /* skeletal packet for transmit */ 46*0Sstevel@tonic-gate struct inpcb *t_inpcb; /* back pointer to internet pcb */ 47*0Sstevel@tonic-gate /* 48*0Sstevel@tonic-gate * The following fields are used as in the protocol specification. 49*0Sstevel@tonic-gate * See RFC783, Dec. 1981, page 21. 50*0Sstevel@tonic-gate */ 51*0Sstevel@tonic-gate /* send sequence variables */ 52*0Sstevel@tonic-gate tcp_seq snd_una; /* send unacknowledged */ 53*0Sstevel@tonic-gate tcp_seq snd_nxt; /* send next */ 54*0Sstevel@tonic-gate tcp_seq snd_up; /* send urgent pointer */ 55*0Sstevel@tonic-gate tcp_seq snd_wl1; /* window update seg seq number */ 56*0Sstevel@tonic-gate tcp_seq snd_wl2; /* window update seg ack number */ 57*0Sstevel@tonic-gate tcp_seq iss; /* initial send sequence number */ 58*0Sstevel@tonic-gate ushort_t snd_wnd; /* send window */ 59*0Sstevel@tonic-gate /* receive sequence variables */ 60*0Sstevel@tonic-gate ushort_t rcv_wnd; /* receive window */ 61*0Sstevel@tonic-gate tcp_seq rcv_nxt; /* receive next */ 62*0Sstevel@tonic-gate tcp_seq rcv_up; /* receive urgent pointer */ 63*0Sstevel@tonic-gate tcp_seq irs; /* initial receive sequence number */ 64*0Sstevel@tonic-gate /* 65*0Sstevel@tonic-gate * Additional variables for this implementation. 66*0Sstevel@tonic-gate */ 67*0Sstevel@tonic-gate /* receive variables */ 68*0Sstevel@tonic-gate tcp_seq rcv_adv; /* advertised window */ 69*0Sstevel@tonic-gate /* retransmit variables */ 70*0Sstevel@tonic-gate tcp_seq snd_max; /* highest sequence number sent */ 71*0Sstevel@tonic-gate /* used to recognize retransmits */ 72*0Sstevel@tonic-gate 73*0Sstevel@tonic-gate /* congestion control (for slow start, source quench, retransmit after loss) */ 74*0Sstevel@tonic-gate ushort_t snd_cwnd; /* congestion-controlled window */ 75*0Sstevel@tonic-gate ushort_t snd_ssthresh; /* snd_cwnd size threshhold for */ 76*0Sstevel@tonic-gate /* for slow start exponential to */ 77*0Sstevel@tonic-gate /* 78*0Sstevel@tonic-gate * transmit timing stuff. 79*0Sstevel@tonic-gate * srtt and rttvar are stored as fixed point; for convenience in smoothing, 80*0Sstevel@tonic-gate * srtt has 3 bits to the right of the binary point, rttvar has 2. 81*0Sstevel@tonic-gate * "Variance" is actually smoothed difference. 82*0Sstevel@tonic-gate */ 83*0Sstevel@tonic-gate short t_idle; /* inactivity time */ 84*0Sstevel@tonic-gate short t_rtt; /* round trip time */ 85*0Sstevel@tonic-gate tcp_seq t_rtseq; /* sequence number being timed */ 86*0Sstevel@tonic-gate short t_srtt; /* smoothed round-trip time */ 87*0Sstevel@tonic-gate short t_rttvar; /* variance in round-trip time */ 88*0Sstevel@tonic-gate ushort_t max_rcvd; /* most peer has sent into window */ 89*0Sstevel@tonic-gate ushort_t max_sndwnd; /* largest window peer has offered */ 90*0Sstevel@tonic-gate /* out-of-band data */ 91*0Sstevel@tonic-gate char t_oobflags; /* have some */ 92*0Sstevel@tonic-gate char t_iobc; /* input character */ 93*0Sstevel@tonic-gate #define TCPOOB_HAVEDATA 0x01 94*0Sstevel@tonic-gate #define TCPOOB_HADDATA 0x02 95*0Sstevel@tonic-gate }; 96*0Sstevel@tonic-gate 97*0Sstevel@tonic-gate #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 98*0Sstevel@tonic-gate #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 99*0Sstevel@tonic-gate 100*0Sstevel@tonic-gate /* 101*0Sstevel@tonic-gate * TCP statistics. 102*0Sstevel@tonic-gate * Many of these should be kept per connection, 103*0Sstevel@tonic-gate * but that's inconvenient at the moment. 104*0Sstevel@tonic-gate */ 105*0Sstevel@tonic-gate struct tcpstat { 106*0Sstevel@tonic-gate uint_t tcps_connattempt; /* connections initiated */ 107*0Sstevel@tonic-gate uint_t tcps_accepts; /* connections accepted */ 108*0Sstevel@tonic-gate uint_t tcps_connects; /* connections established */ 109*0Sstevel@tonic-gate uint_t tcps_drops; /* connections dropped */ 110*0Sstevel@tonic-gate uint_t tcps_conndrops; /* embryonic connections dropped */ 111*0Sstevel@tonic-gate uint_t tcps_closed; /* conn. closed (includes drops) */ 112*0Sstevel@tonic-gate uint_t tcps_segstimed; /* segs where we tried to get rtt */ 113*0Sstevel@tonic-gate uint_t tcps_rttupdated; /* times we succeeded */ 114*0Sstevel@tonic-gate uint_t tcps_delack; /* delayed acks sent */ 115*0Sstevel@tonic-gate uint_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 116*0Sstevel@tonic-gate uint_t tcps_rexmttimeo; /* retransmit timeouts */ 117*0Sstevel@tonic-gate uint_t tcps_persisttimeo; /* persist timeouts */ 118*0Sstevel@tonic-gate uint_t tcps_keeptimeo; /* keepalive timeouts */ 119*0Sstevel@tonic-gate uint_t tcps_keepprobe; /* keepalive probes sent */ 120*0Sstevel@tonic-gate uint_t tcps_keepdrops; /* connections dropped in keepalive */ 121*0Sstevel@tonic-gate 122*0Sstevel@tonic-gate uint_t tcps_sndtotal; /* total packets sent */ 123*0Sstevel@tonic-gate uint_t tcps_sndpack; /* data packets sent */ 124*0Sstevel@tonic-gate uint_t tcps_sndbyte; /* data bytes sent */ 125*0Sstevel@tonic-gate uint_t tcps_sndrexmitpack; /* data packets retransmitted */ 126*0Sstevel@tonic-gate uint_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 127*0Sstevel@tonic-gate uint_t tcps_sndacks; /* ack-only packets sent */ 128*0Sstevel@tonic-gate uint_t tcps_sndprobe; /* window probes sent */ 129*0Sstevel@tonic-gate uint_t tcps_sndurg; /* packets sent with URG only */ 130*0Sstevel@tonic-gate uint_t tcps_sndwinup; /* window update-only packets sent */ 131*0Sstevel@tonic-gate uint_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 132*0Sstevel@tonic-gate 133*0Sstevel@tonic-gate uint_t tcps_rcvtotal; /* total packets received */ 134*0Sstevel@tonic-gate uint_t tcps_rcvpack; /* packets received in sequence */ 135*0Sstevel@tonic-gate uint_t tcps_rcvbyte; /* bytes received in sequence */ 136*0Sstevel@tonic-gate uint_t tcps_rcvbadsum; /* packets received with ccksum errs */ 137*0Sstevel@tonic-gate uint_t tcps_rcvbadoff; /* packets received with bad offset */ 138*0Sstevel@tonic-gate uint_t tcps_rcvshort; /* packets received too short */ 139*0Sstevel@tonic-gate uint_t tcps_rcvduppack; /* duplicate-only packets received */ 140*0Sstevel@tonic-gate uint_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 141*0Sstevel@tonic-gate uint_t tcps_rcvpartduppack; /* packets with some duplicate data */ 142*0Sstevel@tonic-gate uint_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 143*0Sstevel@tonic-gate uint_t tcps_rcvoopack; /* out-of-order packets received */ 144*0Sstevel@tonic-gate uint_t tcps_rcvoobyte; /* out-of-order bytes received */ 145*0Sstevel@tonic-gate uint_t tcps_rcvpackafterwin; /* packets with data after window */ 146*0Sstevel@tonic-gate uint_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 147*0Sstevel@tonic-gate uint_t tcps_rcvafterclose; /* packets rcvd after "close" */ 148*0Sstevel@tonic-gate uint_t tcps_rcvwinprobe; /* rcvd window probe packets */ 149*0Sstevel@tonic-gate uint_t tcps_rcvdupack; /* rcvd duplicate acks */ 150*0Sstevel@tonic-gate uint_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 151*0Sstevel@tonic-gate uint_t tcps_rcvackpack; /* rcvd ack packets */ 152*0Sstevel@tonic-gate uint_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 153*0Sstevel@tonic-gate uint_t tcps_rcvwinupd; /* rcvd window update packets */ 154*0Sstevel@tonic-gate }; 155*0Sstevel@tonic-gate 156*0Sstevel@tonic-gate #define TCP_COMPAT_42 157*0Sstevel@tonic-gate 158*0Sstevel@tonic-gate #ifdef __cplusplus 159*0Sstevel@tonic-gate } 160*0Sstevel@tonic-gate #endif 161*0Sstevel@tonic-gate 162*0Sstevel@tonic-gate #endif /* _NETINET_TCP_VAR_H */ 163