281 lines
13 KiB
C
281 lines
13 KiB
C
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/*
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* Copyright (c) 1982, 1986, 1993
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*The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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*
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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*
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#ifndef NETINET_TCP_VAR_H
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#define NETINET_TCP_VAR_H
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/*
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* Tcp control block, one per tcp connection
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*/
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struct tcpcb {
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struct tcpiphdr *seg_next;
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struct tcpiphdr *seg_prev;
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int16 t_state; /* state of this connection */
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int16 t_timer[TCPT_NTIMERS]; /* tcp timers */
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int16 t_rxtshift; /* log(2) of rexmt exp. backoff */
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int16 t_rxtcur; /* current retransmit value */
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int16 t_dupacks; /* consecutive dup acks recd */
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uint16 t_maxseg; /* maximum segment size */
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int8 t_force; /* 1 if forcing out a byte */
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uint16 t_flags;
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struct tcpiphdr *t_template; /* skeletal packet for transmit */
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struct inpcb *t_inpcb; /* back pointer to internet pcb */
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/*
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* The following fields are used as in the protocol specification.
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* See RFC783, Dec. 1981, page 21.
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*/
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/* send sequence variables */
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tcp_seq snd_una; /* send unacknowledged */
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tcp_seq snd_nxt; /* send next */
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tcp_seq snd_up; /* send urgent pointer */
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tcp_seq snd_wl1; /* window update seg seq number */
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tcp_seq snd_wl2; /* window update seg ack number */
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tcp_seq iss; /* initial send sequence number */
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unsigned long snd_wnd; /* send window */
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/* receive sequence variables */
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unsigned long rcv_wnd; /* receive window */
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tcp_seq rcv_nxt; /* receive next */
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tcp_seq rcv_up; /* receive urgent pointer */
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tcp_seq irs; /* initial receive sequence number */
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/*
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* Additional variables for this implementation.
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*/
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/* receive variables */
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tcp_seq rcv_adv; /* advertised window */
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/* retransmit variables */
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tcp_seq snd_max; /* highest sequence number sent;
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* used to recognize retransmits
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*/
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/* congestion control (for slow start, source quench, retransmit after loss) */
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unsigned long snd_cwnd; /* congestion-controlled window */
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unsigned long snd_ssthresh; /* snd_cwnd size threshhold for
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* for slow start exponential to
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* linear switch
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*/
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uint16 t_maxopd; /* mss plus options */
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uint16 t_peermss; /* peer's maximum segment size */
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/*
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* transmit timing stuff. See below for scale of srtt and rttvar.
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* "Variance" is actually smoothed difference.
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*/
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int16 t_idle; /* inactivity time */
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int16 t_rtt; /* round trip time */
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tcp_seq t_rtseq; /* sequence number being timed */
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uint16 t_srtt; /* smoothed round-trip time */
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uint16 t_rttvar; /* variance in round-trip time */
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uint16 t_rttmin; /* minimum rtt allowed */
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uint32 max_sndwnd; /* largest window peer has offered */
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/* out-of-band data */
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int8 t_oobflags; /* have some */
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int8 t_iobc; /* input character */
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int16 t_softerror; /* possible error, not yet reported... */
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/* RFC 1323 variables */
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uint8 snd_scale; /* window scaling for send window */
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uint8 rcv_scale; /* window scaling for recv window */
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uint8 request_r_scale; /* pending window scaling */
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uint8 requested_s_scale;
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uint32 ts_recent; /* timestamp echo data */
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uint32 ts_recent_age; /* when last updated */
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tcp_seq last_ack_sent;
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};
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#define intotcpcb(ip) ((struct tcpcb*)(ip)->inp_ppcb)
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#define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
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#define TF_ACKNOW 0x0001 /* send ACK immeadiately */
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#define TF_DELACK 0x0002 /* send ACK, but try to delay it */
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#define TF_NODELAY 0x0004 /* don't delay packets to coalesce */
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#define TF_NOOPT 0x0008 /* don't use tcp options */
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#define TF_SENTFIN 0x0010 /* have sent FIN */
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#define TF_REQ_SCALE 0x0020 /* have/will request window scaling */
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#define TF_RCVD_SCALE 0x0040 /* other side has requested scaling */
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#define TF_REQ_TSTMP 0x0080 /* have/will request timestamps */
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#define TF_RCVD_TSTMP 0x0100 /* a timestamp was received in SYN */
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#define TF_SACK_PERMIT 0x0200 /* other side said I could SACK */
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#define TF_SIGNATURE 0x0400 /* require TCP MD5 signature */
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#define TCPOOB_HAVEDATA 0x01 /* we have TCP OOB data */
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#define TCPOOB_HADDATA 0x02 /* we've had some TCP OOB data */
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/*
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* The smoothed round-trip time and estimated variance
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* are stored as fixed point numbers scaled by the values below.
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* For convenience, these scales are also used in smoothing the average
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* (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
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* With these scales, srtt has 3 bits to the right of the binary point,
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* and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
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* binary point, and is smoothed with an ALPHA of 0.75.
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*/
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#define TCP_RTT_SCALE 8 /* multiplier for srtt; 3 bits frac. */
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#define TCP_RTT_SHIFT 3 /* shift for srtt; 3 bits frac. */
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#define TCP_RTTVAR_SCALE 4 /* multiplier for rttvar; 2 bits */
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#define TCP_RTTVAR_SHIFT 2 /* multiplier for rttvar; 2 bits */
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#define TCP_REXMTVAL(tp) \
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((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> 2)
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/*
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* TCP statistics.
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* Many of these should be kept per connection,
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* but that's inconvenient at the moment.
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*/
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struct tcpstat {
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uint32 tcps_connattempt; /* connections initiated */
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uint32 tcps_accepts; /* connections accepted */
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uint32 tcps_connects; /* connections established */
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uint32 tcps_drops; /* connections dropped */
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uint32 tcps_conndrops; /* embryonic connections dropped */
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uint32 tcps_closed; /* conn. closed (includes drops) */
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uint32 tcps_segstimed; /* segs where we tried to get rtt */
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uint32 tcps_rttupdated; /* times we succeeded */
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uint32 tcps_delack; /* delayed acks sent */
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uint32 tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
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uint32 tcps_rexmttimeo; /* retransmit timeouts */
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uint32 tcps_persisttimeo; /* persist timeouts */
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uint32 tcps_persistdrop; /* connections dropped in persist */
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uint32 tcps_keeptimeo; /* keepalive timeouts */
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uint32 tcps_keepprobe; /* keepalive probes sent */
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uint32 tcps_keepdrops; /* connections dropped in keepalive */
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uint32 tcps_sndtotal; /* total packets sent */
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uint32 tcps_sndpack; /* data packets sent */
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uint64 tcps_sndbyte; /* data bytes sent */
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uint32 tcps_sndrexmitpack; /* data packets retransmitted */
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uint64 tcps_sndrexmitbyte; /* data bytes retransmitted */
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uint64 tcps_sndrexmitfast; /* Fast retransmits */
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uint32 tcps_sndacks; /* ack-only packets sent */
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uint32 tcps_sndprobe; /* window probes sent */
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uint32 tcps_sndurg; /* packets sent with URG only */
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uint32 tcps_sndwinup; /* window update-only packets sent */
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uint32 tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
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uint32 tcps_rcvtotal; /* total packets received */
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uint32 tcps_rcvpack; /* packets received in sequence */
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uint64 tcps_rcvbyte; /* bytes received in sequence */
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uint32 tcps_rcvbadsum; /* packets received with ccksum errs */
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uint32 tcps_rcvbadoff; /* packets received with bad offset */
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uint32 tcps_rcvmemdrop; /* packets dropped for lack of memory */
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uint32 tcps_rcvnosec; /* packets dropped for lack of ipsec */
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uint32 tcps_rcvshort; /* packets received too short */
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uint32 tcps_rcvduppack; /* duplicate-only packets received */
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uint64 tcps_rcvdupbyte; /* duplicate-only bytes received */
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uint32 tcps_rcvpartduppack; /* packets with some duplicate data */
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uint64 tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
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uint32 tcps_rcvoopack; /* out-of-order packets received */
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uint64 tcps_rcvoobyte; /* out-of-order bytes received */
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uint32 tcps_rcvpackafterwin; /* packets with data after window */
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uint64 tcps_rcvbyteafterwin; /* bytes rcvd after window */
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uint32 tcps_rcvafterclose; /* packets rcvd after "close" */
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uint32 tcps_rcvwinprobe; /* rcvd window probe packets */
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uint32 tcps_rcvdupack; /* rcvd duplicate acks */
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uint32 tcps_rcvacktoomuch; /* rcvd acks for unsent data */
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uint32 tcps_rcvackpack; /* rcvd ack packets */
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uint64 tcps_rcvackbyte; /* bytes acked by rcvd acks */
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uint32 tcps_rcvwinupd; /* rcvd window update packets */
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uint32 tcps_pawsdrop; /* segments dropped due to PAWS */
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uint32 tcps_predack; /* times hdr predict ok for acks */
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uint32 tcps_preddat; /* times hdr predict ok for data pkts */
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uint32 tcps_pcbhashmiss; /* input packets missing pcb hash */
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uint32 tcps_noport; /* no socket on port */
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uint32 tcps_badsyn; /* SYN packet with src==dst rcv'ed */
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uint32 tcps_rcvbadsig; /* rcvd bad/missing TCP signatures */
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uint64 tcps_rcvgoodsig; /* rcvd good TCP signatures */
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uint32 tcps_inhwcsum; /* input hardware-checksummed packets */
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uint32 tcps_outhwcsum; /* output hardware-checksummed packets */
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};
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/*
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* Names for TCP sysctl objects.
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*/
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#define TCPCTL_RFC1323 1 /* enable/disable RFC1323 timestamps/scaling */
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#define TCPCTL_KEEPINITTIME 2 /* TCPT_KEEP value */
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#define TCPCTL_KEEPIDLE 3 /* allow tcp_keepidle to be changed */
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#define TCPCTL_KEEPINTVL 4 /* allow tcp_keepintvl to be changed */
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#define TCPCTL_SLOWHZ 5 /* return kernel idea of PR_SLOWHZ */
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#define TCPCTL_BADDYNAMIC 6 /* return bad dynamic port bitmap */
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#define TCPCTL_RECVSPACE 7 /* receive buffer space */
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#define TCPCTL_SENDSPACE 8 /* send buffer space */
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#define TCPCTL_IDENT 9 /* get connection owner */
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#define TCPCTL_SACK 10 /* selective acknowledgement, rfc 2018 */
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#define TCPCTL_MSSDFLT 11 /* Default maximum segment size */
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#define TCPCTL_RSTPPSLIMIT 12 /* RST pps limit */
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#define TCPCTL_MAXID 13
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#ifdef _NETWORK_STACK
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struct inpcb tcb;
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struct tcpstat tcpstat;
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int tcp_mssdflt;
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int tcp_do_rfc1323;
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unsigned long tcp_now;
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void tcp_input(struct mbuf *, int);
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int tcp_output(struct tcpcb*);
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int tcp_mss(struct tcpcb *, uint);
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void tcp_mss_update(struct tcpcb *);
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void tcp_quench(struct inpcb *, int);
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int tcp_userreq(struct socket *, int, struct mbuf *, struct mbuf *,
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struct mbuf *);
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struct tcpcb * tcp_timers(struct tcpcb *, int);
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struct tcpcb *tcp_close(struct tcpcb *);
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void tcp_setpersist(struct tcpcb *);
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struct tcpcb *tcp_drop(struct tcpcb *, int);
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void tcp_respond(struct tcpcb *, struct tcpiphdr *, struct mbuf *,
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tcp_seq, tcp_seq, int);
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void tcp_xmit_timer(struct tcpcb *, int16);
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void tcp_dooptions(struct tcpcb *, u_char *, int, struct tcpiphdr *,
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int *, uint32 *, uint32 *);
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struct tcpiphdr *tcp_template(struct tcpcb *);
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void tcp_pulloutofband(struct socket *, struct tcpiphdr *, struct mbuf *);
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void tcp_canceltimers(struct tcpcb *);
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void tcp_trace(int16, int16, struct tcpcb *, void *, int, int);
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void tcp_slowtimer(void *data);
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void tcp_fasttimer(void *data);
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#endif
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#endif /* NETINET_TCP_VAR_H */
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