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/* * Copyright (c) 1982, 1986 Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that this notice is preserved and that due credit is given * to the University of California at Berkeley. The name of the University * may not be used to endorse or promote products derived from this * software without specific prior written permission. This software * is provided ``as is'' without express or implied warranty. * * @(#)tcp_var.h 7.7 (Berkeley) 2/27/88 */ /* * TCP configuration: This is a half-assed attempt to make TCP * self-configure for a few varieties of 4.2 and 4.3-based unixes. * If you don't have a) a 4.3bsd vax or b) a 3.x Sun (x<6), check * this carefully (it's probably not right). Please send me mail * if you run into configuration problems. * - Van Jacobson (van@lbl-csam.arpa) */ #ifndef BSD #define BSD 42 /* if we're not 4.3, pretend we're 4.2 */ #define OLDSTAT /* set if we have to use old netstat binaries */ #endif /* #define OLDSTAT /* set if we have to use old netstat binaries */ #if __sun__ || BSD < 43 #define TCP_COMPAT_42 /* set if we have to interop w/4.2 systems */ #endif #ifndef SB_MAX #ifdef SB_MAXCOUNT #define SB_MAX SB_MAXCOUNT /* Sun has to be a little bit different... */ #else #define SB_MAX 32767 /* XXX */ #endif #endif #ifndef IP_MAXPACKET #define IP_MAXPACKET 65535 /* maximum packet size */ #endif /* * Bill Nowicki pointed out that the page size (CLBYTES) has * nothing to do with the mbuf cluster size. So, we followed * Sun's lead and made the new define MCLBYTES stand for the mbuf * cluster size. The following define makes up backwards compatible * with 4.3 and 4.2. If CLBYTES is >1024 on your machine, check * this against the mbuf cluster definitions in /usr/include/sys/mbuf.h. */ #ifndef MCLBYTES #define MCLBYTES CLBYTES /* XXX */ #endif /* * The routine in_localaddr is broken in Sun's 3.4. We redefine ours * (in tcp_input.c) so we use can it but won't have a name conflict. */ #ifdef __sun__ #define in_localaddr tcp_in_localaddr #endif /* --------------- end of TCP config ---------------- */ /* * Kernel variables for tcp. */ /* * 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 */ u_short t_maxseg; /* maximum segment size */ char t_force; /* 1 if forcing out a byte */ u_char 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 */ u_short snd_wnd; /* send window */ /* receive sequence variables */ u_short 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) */ u_short snd_cwnd; /* congestion-controlled window */ u_short snd_ssthresh; /* snd_cwnd size threshhold for * for slow start exponential to * linear switch */ /* * 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 */ u_short max_rcvd; /* most peer has sent into window */ u_short 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 { #ifdef OLDSTAT /* * Declare statistics the same as in 4.3 * at the start of tcpstat (same size and * position) for netstat. */ int tcps_rcvbadsum; int tcps_rcvbadoff; int tcps_rcvshort; int tcps_badsegs; int tcps_unack; #define tcps_badsum tcps_rcvbadsum #define tcps_badoff tcps_rcvbadoff #define tcps_hdrops tcps_rcvshort #endif u_long tcps_connattempt; /* connections initiated */ u_long tcps_accepts; /* connections accepted */ u_long tcps_connects; /* connections established */ u_long tcps_drops; /* connections dropped */ u_long tcps_conndrops; /* embryonic connections dropped */ u_long tcps_closed; /* conn. closed (includes drops) */ u_long tcps_segstimed; /* segs where we tried to get rtt */ u_long tcps_rttupdated; /* times we succeeded */ u_long tcps_delack; /* delayed acks sent */ u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ u_long tcps_rexmttimeo; /* retransmit timeouts */ u_long tcps_persisttimeo; /* persist timeouts */ u_long tcps_keeptimeo; /* keepalive timeouts */ u_long tcps_keepprobe; /* keepalive probes sent */ u_long tcps_keepdrops; /* connections dropped in keepalive */ u_long tcps_sndtotal; /* total packets sent */ u_long tcps_sndpack; /* data packets sent */ u_long tcps_sndbyte; /* data bytes sent */ u_long tcps_sndrexmitpack; /* data packets retransmitted */ u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ u_long tcps_sndacks; /* ack-only packets sent */ u_long tcps_sndprobe; /* window probes sent */ u_long tcps_sndurg; /* packets sent with URG only */ u_long tcps_sndwinup; /* window update-only packets sent */ u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ u_long tcps_rcvtotal; /* total packets received */ u_long tcps_rcvpack; /* packets received in sequence */ u_long tcps_rcvbyte; /* bytes received in sequence */ #ifndef OLDSTAT u_long tcps_rcvbadsum; /* packets received with ccksum errs */ u_long tcps_rcvbadoff; /* packets received with bad offset */ u_long tcps_rcvshort; /* packets received too short */ #endif u_long tcps_rcvduppack; /* duplicate-only packets received */ u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ u_long tcps_rcvpartduppack; /* packets with some duplicate data */ u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ u_long tcps_rcvoopack; /* out-of-order packets received */ u_long tcps_rcvoobyte; /* out-of-order bytes received */ u_long tcps_rcvpackafterwin; /* packets with data after window */ u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ u_long tcps_rcvafterclose; /* packets rcvd after "close" */ u_long tcps_rcvwinprobe; /* rcvd window probe packets */ u_long tcps_rcvdupack; /* rcvd duplicate acks */ u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ u_long tcps_rcvackpack; /* rcvd ack packets */ u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ u_long tcps_rcvwinupd; /* rcvd window update packets */ }; #ifdef KERNEL struct inpcb tcb; /* head of queue of active tcpcb's */ struct tcpstat tcpstat; /* tcp statistics */ struct tcpiphdr *tcp_template(); struct tcpcb *tcp_close(), *tcp_drop(); struct tcpcb *tcp_timers(), *tcp_disconnect(), *tcp_usrclosed(); #endif
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