haiku/headers/posix/netinet/tcp_var.h

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/*
* Copyright (c) 1982, 1986, 1993
*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.
*
*/
#ifndef NETINET_TCP_VAR_H
#define NETINET_TCP_VAR_H
/*
* Tcp control block, one per tcp connection
*/
struct tcpcb {
struct tcpiphdr *seg_next;
struct tcpiphdr *seg_prev;
int16 t_state; /* state of this connection */
int16 t_timer[TCPT_NTIMERS]; /* tcp timers */
int16 t_rxtshift; /* log(2) of rexmt exp. backoff */
int16 t_rxtcur; /* current retransmit value */
int16 t_dupacks; /* consecutive dup acks recd */
uint16 t_maxseg; /* maximum segment size */
int8 t_force; /* 1 if forcing out a byte */
uint16 t_flags;
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 */
unsigned long snd_wnd; /* send window */
/* receive sequence variables */
unsigned 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) */
unsigned long snd_cwnd; /* congestion-controlled window */
unsigned long snd_ssthresh; /* snd_cwnd size threshhold for
* for slow start exponential to
* linear switch
*/
uint16 t_maxopd; /* mss plus options */
uint16 t_peermss; /* peer's maximum segment size */
/*
* transmit timing stuff. See below for scale of srtt and rttvar.
* "Variance" is actually smoothed difference.
*/
int16 t_idle; /* inactivity time */
int16 t_rtt; /* round trip time */
tcp_seq t_rtseq; /* sequence number being timed */
uint16 t_srtt; /* smoothed round-trip time */
uint16 t_rttvar; /* variance in round-trip time */
uint16 t_rttmin; /* minimum rtt allowed */
uint32 max_sndwnd; /* largest window peer has offered */
/* out-of-band data */
int8 t_oobflags; /* have some */
int8 t_iobc; /* input character */
int16 t_softerror; /* possible error, not yet reported... */
/* RFC 1323 variables */
uint8 snd_scale; /* window scaling for send window */
uint8 rcv_scale; /* window scaling for recv window */
uint8 request_r_scale; /* pending window scaling */
uint8 requested_s_scale;
uint32 ts_recent; /* timestamp echo data */
uint32 ts_recent_age; /* when last updated */
tcp_seq last_ack_sent;
};
#define intotcpcb(ip) ((struct tcpcb*)(ip)->inp_ppcb)
#define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
#define TF_ACKNOW 0x0001 /* send ACK immeadiately */
#define TF_DELACK 0x0002 /* send 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_SIGNATURE 0x0400 /* require TCP MD5 signature */
#define TCPOOB_HAVEDATA 0x01 /* we have TCP OOB data */
#define TCPOOB_HADDATA 0x02 /* we've had some TCP OOB data */
/*
* 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 8 /* multiplier for srtt; 3 bits frac. */
#define TCP_RTT_SHIFT 3 /* shift for srtt; 3 bits frac. */
#define TCP_RTTVAR_SCALE 4 /* multiplier for rttvar; 2 bits */
#define TCP_RTTVAR_SHIFT 2 /* multiplier for rttvar; 2 bits */
#define TCP_REXMTVAL(tp) \
((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> 2)
/*
* TCP statistics.
* Many of these should be kept per connection,
* but that's inconvenient at the moment.
*/
struct tcpstat {
uint32 tcps_connattempt; /* connections initiated */
uint32 tcps_accepts; /* connections accepted */
uint32 tcps_connects; /* connections established */
uint32 tcps_drops; /* connections dropped */
uint32 tcps_conndrops; /* embryonic connections dropped */
uint32 tcps_closed; /* conn. closed (includes drops) */
uint32 tcps_segstimed; /* segs where we tried to get rtt */
uint32 tcps_rttupdated; /* times we succeeded */
uint32 tcps_delack; /* delayed acks sent */
uint32 tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
uint32 tcps_rexmttimeo; /* retransmit timeouts */
uint32 tcps_persisttimeo; /* persist timeouts */
uint32 tcps_persistdrop; /* connections dropped in persist */
uint32 tcps_keeptimeo; /* keepalive timeouts */
uint32 tcps_keepprobe; /* keepalive probes sent */
uint32 tcps_keepdrops; /* connections dropped in keepalive */
uint32 tcps_sndtotal; /* total packets sent */
uint32 tcps_sndpack; /* data packets sent */
uint64 tcps_sndbyte; /* data bytes sent */
uint32 tcps_sndrexmitpack; /* data packets retransmitted */
uint64 tcps_sndrexmitbyte; /* data bytes retransmitted */
uint64 tcps_sndrexmitfast; /* Fast retransmits */
uint32 tcps_sndacks; /* ack-only packets sent */
uint32 tcps_sndprobe; /* window probes sent */
uint32 tcps_sndurg; /* packets sent with URG only */
uint32 tcps_sndwinup; /* window update-only packets sent */
uint32 tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
uint32 tcps_rcvtotal; /* total packets received */
uint32 tcps_rcvpack; /* packets received in sequence */
uint64 tcps_rcvbyte; /* bytes received in sequence */
uint32 tcps_rcvbadsum; /* packets received with ccksum errs */
uint32 tcps_rcvbadoff; /* packets received with bad offset */
uint32 tcps_rcvmemdrop; /* packets dropped for lack of memory */
uint32 tcps_rcvnosec; /* packets dropped for lack of ipsec */
uint32 tcps_rcvshort; /* packets received too short */
uint32 tcps_rcvduppack; /* duplicate-only packets received */
uint64 tcps_rcvdupbyte; /* duplicate-only bytes received */
uint32 tcps_rcvpartduppack; /* packets with some duplicate data */
uint64 tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
uint32 tcps_rcvoopack; /* out-of-order packets received */
uint64 tcps_rcvoobyte; /* out-of-order bytes received */
uint32 tcps_rcvpackafterwin; /* packets with data after window */
uint64 tcps_rcvbyteafterwin; /* bytes rcvd after window */
uint32 tcps_rcvafterclose; /* packets rcvd after "close" */
uint32 tcps_rcvwinprobe; /* rcvd window probe packets */
uint32 tcps_rcvdupack; /* rcvd duplicate acks */
uint32 tcps_rcvacktoomuch; /* rcvd acks for unsent data */
uint32 tcps_rcvackpack; /* rcvd ack packets */
uint64 tcps_rcvackbyte; /* bytes acked by rcvd acks */
uint32 tcps_rcvwinupd; /* rcvd window update packets */
uint32 tcps_pawsdrop; /* segments dropped due to PAWS */
uint32 tcps_predack; /* times hdr predict ok for acks */
uint32 tcps_preddat; /* times hdr predict ok for data pkts */
uint32 tcps_pcbhashmiss; /* input packets missing pcb hash */
uint32 tcps_noport; /* no socket on port */
uint32 tcps_badsyn; /* SYN packet with src==dst rcv'ed */
uint32 tcps_rcvbadsig; /* rcvd bad/missing TCP signatures */
uint64 tcps_rcvgoodsig; /* rcvd good TCP signatures */
uint32 tcps_inhwcsum; /* input hardware-checksummed packets */
uint32 tcps_outhwcsum; /* output hardware-checksummed packets */
};
/*
* Names for TCP sysctl objects.
*/
#define TCPCTL_RFC1323 1 /* enable/disable RFC1323 timestamps/scaling */
#define TCPCTL_KEEPINITTIME 2 /* TCPT_KEEP value */
#define TCPCTL_KEEPIDLE 3 /* allow tcp_keepidle to be changed */
#define TCPCTL_KEEPINTVL 4 /* allow tcp_keepintvl to be changed */
#define TCPCTL_SLOWHZ 5 /* return kernel idea of PR_SLOWHZ */
#define TCPCTL_BADDYNAMIC 6 /* return bad dynamic port bitmap */
#define TCPCTL_RECVSPACE 7 /* receive buffer space */
#define TCPCTL_SENDSPACE 8 /* send buffer space */
#define TCPCTL_IDENT 9 /* get connection owner */
#define TCPCTL_SACK 10 /* selective acknowledgement, rfc 2018 */
#define TCPCTL_MSSDFLT 11 /* Default maximum segment size */
#define TCPCTL_RSTPPSLIMIT 12 /* RST pps limit */
#define TCPCTL_MAXID 13
#ifdef _NETWORK_STACK
struct inpcb tcb;
struct tcpstat tcpstat;
int tcp_mssdflt;
int tcp_do_rfc1323;
unsigned long tcp_now;
void tcp_input(struct mbuf *, int);
int tcp_output(struct tcpcb*);
int tcp_mss(struct tcpcb *, uint);
void tcp_mss_update(struct tcpcb *);
void tcp_quench(struct inpcb *, int);
int tcp_userreq(struct socket *, int, struct mbuf *, struct mbuf *,
struct mbuf *);
struct tcpcb * tcp_timers(struct tcpcb *, int);
struct tcpcb *tcp_close(struct tcpcb *);
void tcp_setpersist(struct tcpcb *);
struct tcpcb *tcp_drop(struct tcpcb *, int);
void tcp_respond(struct tcpcb *, struct tcpiphdr *, struct mbuf *,
tcp_seq, tcp_seq, int);
void tcp_xmit_timer(struct tcpcb *, int16);
void tcp_dooptions(struct tcpcb *, u_char *, int, struct tcpiphdr *,
int *, uint32 *, uint32 *);
struct tcpiphdr *tcp_template(struct tcpcb *);
void tcp_pulloutofband(struct socket *, struct tcpiphdr *, struct mbuf *);
void tcp_canceltimers(struct tcpcb *);
void tcp_trace(int16, int16, struct tcpcb *, void *, int, int);
void tcp_slowtimer(void *data);
void tcp_fasttimer(void *data);
#endif
#endif /* NETINET_TCP_VAR_H */