diff options
Diffstat (limited to 'c/src/lib/libnetworking/netinet/tcp_var.h')
| -rw-r--r-- | c/src/lib/libnetworking/netinet/tcp_var.h | 374 |
1 files changed, 0 insertions, 374 deletions
diff --git a/c/src/lib/libnetworking/netinet/tcp_var.h b/c/src/lib/libnetworking/netinet/tcp_var.h deleted file mode 100644 index 8e63a2cafe..0000000000 --- a/c/src/lib/libnetworking/netinet/tcp_var.h +++ /dev/null @@ -1,374 +0,0 @@ -/* - * Copyright (c) 1982, 1986, 1993, 1994, 1995 - * The Regents of the University of California. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 - * $Id$ - */ - -#ifndef _NETINET_TCP_VAR_H_ -#define _NETINET_TCP_VAR_H_ -/* - * Kernel variables for tcp. - */ - -/* - * Tcp control block, one per tcp; fields: - */ -struct tcpcb { - struct tcpiphdr *seg_next; /* sequencing queue */ - struct tcpiphdr *seg_prev; - int t_state; /* state of this connection */ - int t_timer[TCPT_NTIMERS]; /* tcp timers */ - int t_rxtshift; /* log(2) of rexmt exp. backoff */ - int t_rxtcur; /* current retransmit value */ - int t_dupacks; /* consecutive dup acks recd */ - u_int t_maxseg; /* maximum segment size */ - u_int t_maxopd; /* mss plus options */ - int t_force; /* 1 if forcing out a byte */ - u_int t_flags; -#define TF_ACKNOW 0x0001 /* ack peer immediately */ -#define TF_DELACK 0x0002 /* ack, but try to delay it */ -#define TF_NODELAY 0x0004 /* don't delay packets to coalesce */ -#define TF_NOOPT 0x0008 /* don't use tcp options */ -#define TF_SENTFIN 0x0010 /* have sent FIN */ -#define TF_REQ_SCALE 0x0020 /* have/will request window scaling */ -#define TF_RCVD_SCALE 0x0040 /* other side has requested scaling */ -#define TF_REQ_TSTMP 0x0080 /* have/will request timestamps */ -#define TF_RCVD_TSTMP 0x0100 /* a timestamp was received in SYN */ -#define TF_SACK_PERMIT 0x0200 /* other side said I could SACK */ -#define TF_NEEDSYN 0x0400 /* send SYN (implicit state) */ -#define TF_NEEDFIN 0x0800 /* send FIN (implicit state) */ -#define TF_NOPUSH 0x1000 /* don't push */ -#define TF_REQ_CC 0x2000 /* have/will request CC */ -#define TF_RCVD_CC 0x4000 /* a CC was received in SYN */ -#define TF_SENDCCNEW 0x8000 /* send CCnew instead of CC in SYN */ - - 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_long snd_wnd; /* send window */ -/* receive sequence variables */ - u_long 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_long snd_cwnd; /* congestion-controlled window */ - u_long snd_ssthresh; /* snd_cwnd size threshold for - * for slow start exponential to - * linear switch - */ -/* - * transmit timing stuff. See below for scale of srtt and rttvar. - * "Variance" is actually smoothed difference. - */ - u_int t_idle; /* inactivity time */ - int t_rtt; /* round trip time */ - tcp_seq t_rtseq; /* sequence number being timed */ - int t_srtt; /* smoothed round-trip time */ - int t_rttvar; /* variance in round-trip time */ - u_int t_rttmin; /* minimum rtt allowed */ - u_long 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 - int t_softerror; /* possible error not yet reported */ - -/* RFC 1323 variables */ - u_char snd_scale; /* window scaling for send window */ - u_char rcv_scale; /* window scaling for recv window */ - u_char request_r_scale; /* pending window scaling */ - u_char requested_s_scale; - u_long ts_recent; /* timestamp echo data */ - u_long ts_recent_age; /* when last updated */ - tcp_seq last_ack_sent; -/* RFC 1644 variables */ - tcp_cc cc_send; /* send connection count */ - tcp_cc cc_recv; /* receive connection count */ - u_long t_duration; /* connection duration */ - -/* TUBA stuff */ - caddr_t t_tuba_pcb; /* next level down pcb for TCP over z */ -/* More RTT stuff */ - u_long t_rttupdated; /* number of times rtt sampled */ -}; - -/* - * Structure to hold TCP options that are only used during segment - * processing (in tcp_input), but not held in the tcpcb. - * It's basically used to reduce the number of parameters - * to tcp_dooptions. - */ -struct tcpopt { - u_long to_flag; /* which options are present */ -#define TOF_TS 0x0001 /* timestamp */ -#define TOF_CC 0x0002 /* CC and CCnew are exclusive */ -#define TOF_CCNEW 0x0004 -#define TOF_CCECHO 0x0008 - u_long to_tsval; - u_long to_tsecr; - tcp_cc to_cc; /* holds CC or CCnew */ - tcp_cc to_ccecho; -}; - -/* - * The TAO cache entry which is stored in the protocol family specific - * portion of the route metrics. - */ -struct rmxp_tao { - tcp_cc tao_cc; /* latest CC in valid SYN */ - tcp_cc tao_ccsent; /* latest CC sent to peer */ - u_short tao_mssopt; /* peer's cached MSS */ -#ifdef notyet - u_short tao_flags; /* cache status flags */ -#define TAOF_DONT 0x0001 /* peer doesn't understand rfc1644 */ -#define TAOF_OK 0x0002 /* peer does understand rfc1644 */ -#define TAOF_UNDEF 0 /* we don't know yet */ -#endif /* notyet */ -}; -#define rmx_taop(r) ((struct rmxp_tao *)(r).rmx_filler) - -#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) -#define sototcpcb(so) (intotcpcb(sotoinpcb(so))) - -/* - * The smoothed round-trip time and estimated variance - * are stored as fixed point numbers scaled by the values below. - * For convenience, these scales are also used in smoothing the average - * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). - * With these scales, srtt has 3 bits to the right of the binary point, - * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the - * binary point, and is smoothed with an ALPHA of 0.75. - */ -#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ -#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ -#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ -#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ -#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ - -/* - * The initial retransmission should happen at rtt + 4 * rttvar. - * Because of the way we do the smoothing, srtt and rttvar - * will each average +1/2 tick of bias. When we compute - * the retransmit timer, we want 1/2 tick of rounding and - * 1 extra tick because of +-1/2 tick uncertainty in the - * firing of the timer. The bias will give us exactly the - * 1.5 tick we need. But, because the bias is - * statistical, we have to test that we don't drop below - * the minimum feasible timer (which is 2 ticks). - * This version of the macro adapted from a paper by Lawrence - * Brakmo and Larry Peterson which outlines a problem caused - * by insufficient precision in the original implementation, - * which results in inappropriately large RTO values for very - * fast networks. - */ -#define TCP_REXMTVAL(tp) \ - ((((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ - + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) - -/* XXX - * We want to avoid doing m_pullup on incoming packets but that - * means avoiding dtom on the tcp reassembly code. That in turn means - * keeping an mbuf pointer in the reassembly queue (since we might - * have a cluster). As a quick hack, the source & destination - * port numbers (which are no longer needed once we've located the - * tcpcb) are overlayed with an mbuf pointer. - */ -#define REASS_MBUF(ti) (*(struct mbuf **)&((ti)->ti_t)) - -/* - * TCP statistics. - * Many of these should be kept per connection, - * but that's inconvenient at the moment. - */ -struct tcpstat { - 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 */ - 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 */ - 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 */ - u_long tcps_pawsdrop; /* segments dropped due to PAWS */ - u_long tcps_predack; /* times hdr predict ok for acks */ - u_long tcps_preddat; /* times hdr predict ok for data pkts */ - u_long tcps_pcbcachemiss; - u_long tcps_cachedrtt; /* times cached RTT in route updated */ - u_long tcps_cachedrttvar; /* times cached rttvar updated */ - u_long tcps_cachedssthresh; /* times cached ssthresh updated */ - u_long tcps_usedrtt; /* times RTT initialized from route */ - u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ - u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ - u_long tcps_persistdrop; /* timeout in persist state */ - u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ - u_long tcps_mturesent; /* resends due to MTU discovery */ - u_long tcps_listendrop; /* listen queue overflows */ -}; - -/* - * Names for TCP sysctl objects - */ -#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ -#define TCPCTL_DO_RFC1644 2 /* use RFC-1644 extensions */ -#define TCPCTL_MSSDFLT 3 /* MSS default */ -#define TCPCTL_STATS 4 /* statistics (read-only) */ -#define TCPCTL_RTTDFLT 5 /* default RTT estimate */ -#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ -#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ -#define TCPCTL_SENDSPACE 8 /* send buffer space */ -#define TCPCTL_RECVSPACE 9 /* receive buffer space */ -#define TCPCTL_KEEPINIT 10 /* receive buffer space */ -#define TCPCTL_MAXID 11 - -#define TCPCTL_NAMES { \ - { 0, 0 }, \ - { "rfc1323", CTLTYPE_INT }, \ - { "rfc1644", CTLTYPE_INT }, \ - { "mssdflt", CTLTYPE_INT }, \ - { "stats", CTLTYPE_STRUCT }, \ - { "rttdflt", CTLTYPE_INT }, \ - { "keepidle", CTLTYPE_INT }, \ - { "keepintvl", CTLTYPE_INT }, \ - { "sendspace", CTLTYPE_INT }, \ - { "recvspace", CTLTYPE_INT }, \ - { "keepinit", CTLTYPE_INT }, \ -} - -#ifdef KERNEL -extern struct inpcbhead tcb; /* head of queue of active tcpcb's */ -extern struct inpcbinfo tcbinfo; -extern struct tcpstat tcpstat; /* tcp statistics */ -extern int tcp_mssdflt; /* XXX */ -extern u_long tcp_now; /* for RFC 1323 timestamps */ - -void tcp_canceltimers __P((struct tcpcb *)); -struct tcpcb * - tcp_close __P((struct tcpcb *)); -void tcp_ctlinput __P((int, struct sockaddr *, void *)); -int tcp_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); -struct tcpcb * - tcp_drop __P((struct tcpcb *, int)); -void tcp_drain __P((void)); -void tcp_fasttimo __P((void)); -struct rmxp_tao * - tcp_gettaocache __P((struct inpcb *)); -void tcp_init __P((void)); -void tcp_input __P((struct mbuf *, int)); -void tcp_mss __P((struct tcpcb *, int)); -int tcp_mssopt __P((struct tcpcb *)); -void tcp_mtudisc __P((struct inpcb *, int)); -struct tcpcb * - tcp_newtcpcb __P((struct inpcb *)); -int tcp_output __P((struct tcpcb *)); -void tcp_quench __P((struct inpcb *, int)); -void tcp_respond __P((struct tcpcb *, - struct tcpiphdr *, struct mbuf *, u_long, u_long, int)); -struct rtentry * - tcp_rtlookup __P((struct inpcb *)); -void tcp_setpersist __P((struct tcpcb *)); -void tcp_slowtimo __P((void)); -struct tcpiphdr * - tcp_template __P((struct tcpcb *)); -struct tcpcb * - tcp_timers __P((struct tcpcb *, int)); -void tcp_trace __P((int, int, struct tcpcb *, struct tcpiphdr *, int)); - -extern struct pr_usrreqs tcp_usrreqs; -extern u_long tcp_sendspace; -extern u_long tcp_recvspace; - -#endif /* KERNEL */ - -#endif /* _NETINET_TCP_VAR_H_ */ |