/* * Copyright (c) 1997-1998 by Sun Microsystems, Inc. * All rights reserved. */ /* * Copyright (c) 1982, 1986 Regents of the University of California. * All rights reserved. The Berkeley software License Agreement * specifies the terms and conditions for redistribution. */ /* * Kernel variables for tcp. */ #ifndef _NETINET_TCP_VAR_H #define _NETINET_TCP_VAR_H /* tcp_var.h 1.11 88/08/19 SMI; from UCB 7.3 6/30/87 */ #ifdef __cplusplus extern "C" { #endif /* * Tcp control block, one per tcp; fields: */ struct tcpcb { struct tcpiphdr *seg_next; /* sequencing queue */ struct tcpiphdr *seg_prev; short t_state; /* state of this connection */ short t_timer[TCPT_NTIMERS]; /* tcp timers */ short t_rxtshift; /* log(2) of rexmt exp. backoff */ short t_rxtcur; /* current retransmit value */ short t_dupacks; /* consecutive dup acks recd */ ushort_t t_maxseg; /* maximum segment size */ char t_force; /* 1 if forcing out a byte */ uchar_t t_flags; #define TF_ACKNOW 0x01 /* ack peer immediately */ #define TF_DELACK 0x02 /* ack, but try to delay it */ #define TF_NODELAY 0x04 /* don't delay packets to coalesce */ #define TF_NOOPT 0x08 /* don't use tcp options */ #define TF_SENTFIN 0x10 /* have sent FIN */ struct tcpiphdr *t_template; /* skeletal packet for transmit */ struct inpcb *t_inpcb; /* back pointer to internet pcb */ /* * The following fields are used as in the protocol specification. * See RFC783, Dec. 1981, page 21. */ /* send sequence variables */ tcp_seq snd_una; /* send unacknowledged */ tcp_seq snd_nxt; /* send next */ tcp_seq snd_up; /* send urgent pointer */ tcp_seq snd_wl1; /* window update seg seq number */ tcp_seq snd_wl2; /* window update seg ack number */ tcp_seq iss; /* initial send sequence number */ ushort_t snd_wnd; /* send window */ /* receive sequence variables */ ushort_t rcv_wnd; /* receive window */ tcp_seq rcv_nxt; /* receive next */ tcp_seq rcv_up; /* receive urgent pointer */ tcp_seq irs; /* initial receive sequence number */ /* * Additional variables for this implementation. */ /* receive variables */ tcp_seq rcv_adv; /* advertised window */ /* retransmit variables */ tcp_seq snd_max; /* highest sequence number sent */ /* used to recognize retransmits */ /* congestion control (for slow start, source quench, retransmit after loss) */ ushort_t snd_cwnd; /* congestion-controlled window */ ushort_t snd_ssthresh; /* snd_cwnd size threshhold for */ /* for slow start exponential to */ /* * transmit timing stuff. * srtt and rttvar are stored as fixed point; for convenience in smoothing, * srtt has 3 bits to the right of the binary point, rttvar has 2. * "Variance" is actually smoothed difference. */ short t_idle; /* inactivity time */ short t_rtt; /* round trip time */ tcp_seq t_rtseq; /* sequence number being timed */ short t_srtt; /* smoothed round-trip time */ short t_rttvar; /* variance in round-trip time */ ushort_t max_rcvd; /* most peer has sent into window */ ushort_t max_sndwnd; /* largest window peer has offered */ /* out-of-band data */ char t_oobflags; /* have some */ char t_iobc; /* input character */ #define TCPOOB_HAVEDATA 0x01 #define TCPOOB_HADDATA 0x02 }; #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) /* * TCP statistics. * Many of these should be kept per connection, * but that's inconvenient at the moment. */ struct tcpstat { uint_t tcps_connattempt; /* connections initiated */ uint_t tcps_accepts; /* connections accepted */ uint_t tcps_connects; /* connections established */ uint_t tcps_drops; /* connections dropped */ uint_t tcps_conndrops; /* embryonic connections dropped */ uint_t tcps_closed; /* conn. closed (includes drops) */ uint_t tcps_segstimed; /* segs where we tried to get rtt */ uint_t tcps_rttupdated; /* times we succeeded */ uint_t tcps_delack; /* delayed acks sent */ uint_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ uint_t tcps_rexmttimeo; /* retransmit timeouts */ uint_t tcps_persisttimeo; /* persist timeouts */ uint_t tcps_keeptimeo; /* keepalive timeouts */ uint_t tcps_keepprobe; /* keepalive probes sent */ uint_t tcps_keepdrops; /* connections dropped in keepalive */ uint_t tcps_sndtotal; /* total packets sent */ uint_t tcps_sndpack; /* data packets sent */ uint_t tcps_sndbyte; /* data bytes sent */ uint_t tcps_sndrexmitpack; /* data packets retransmitted */ uint_t tcps_sndrexmitbyte; /* data bytes retransmitted */ uint_t tcps_sndacks; /* ack-only packets sent */ uint_t tcps_sndprobe; /* window probes sent */ uint_t tcps_sndurg; /* packets sent with URG only */ uint_t tcps_sndwinup; /* window update-only packets sent */ uint_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ uint_t tcps_rcvtotal; /* total packets received */ uint_t tcps_rcvpack; /* packets received in sequence */ uint_t tcps_rcvbyte; /* bytes received in sequence */ uint_t tcps_rcvbadsum; /* packets received with ccksum errs */ uint_t tcps_rcvbadoff; /* packets received with bad offset */ uint_t tcps_rcvshort; /* packets received too short */ uint_t tcps_rcvduppack; /* duplicate-only packets received */ uint_t tcps_rcvdupbyte; /* duplicate-only bytes received */ uint_t tcps_rcvpartduppack; /* packets with some duplicate data */ uint_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ uint_t tcps_rcvoopack; /* out-of-order packets received */ uint_t tcps_rcvoobyte; /* out-of-order bytes received */ uint_t tcps_rcvpackafterwin; /* packets with data after window */ uint_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ uint_t tcps_rcvafterclose; /* packets rcvd after "close" */ uint_t tcps_rcvwinprobe; /* rcvd window probe packets */ uint_t tcps_rcvdupack; /* rcvd duplicate acks */ uint_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ uint_t tcps_rcvackpack; /* rcvd ack packets */ uint_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ uint_t tcps_rcvwinupd; /* rcvd window update packets */ }; #define TCP_COMPAT_42 #ifdef __cplusplus } #endif #endif /* _NETINET_TCP_VAR_H */
