slirp-android/tcp_var.h - qemu-android - Git at Google

 /*
  * Copyright (c) 1982, 1986, 1993, 1994
  *	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	8.3 (Berkeley) 4/10/94
  * tcp_var.h,v 1.3 1994/08/21 05:27:39 paul Exp
  */

 #ifndef _TCP_VAR_H_
 #define _TCP_VAR_H_

 #include "mbuf.h"
 #include "tcpip.h"
 #include "tcp_timer.h"

 /*
  * 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_short	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 */

 	/* Make it static  for now */
 /*	struct	tcpiphdr *t_template;	/ * skeletal packet for transmit */
 	struct	tcpiphdr t_template;

 	struct	socket *t_socket;		/* back pointer to socket */
 /*
  * 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_int32_t snd_wnd;		/* send window */
 /* receive sequence variables */
 	u_int32_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) */
 	u_int32_t snd_cwnd;		/* congestion-controlled window */
 	u_int32_t 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.
  */
 	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	t_rttmin;		/* minimum rtt allowed */
 	u_int32_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
 	short	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_int32_t	ts_recent;		/* timestamp echo data */
 	u_int32_t	ts_recent_age;		/* when last updated */
 	tcp_seq	last_ack_sent;

 };

 #define	sototcpcb(so)	((so)->so_tcpcb)

 /*
  * 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 */

 /*
  * 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 macro assumes that the value of TCP_RTTVAR_SCALE
  * is the same as the multiplier for rttvar.
  */
 #define	TCP_REXMTVAL(tp) \
 	(((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar)

 /*
  * 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_socachemiss;	/* tcp_last_so misses */
 	u_long	tcps_didnuttin;		/* Times tcp_output didn't do anything XXX */
 };

 extern struct	tcpstat tcpstat;	/* tcp statistics */
 extern u_int32_t	tcp_now;		/* for RFC 1323 timestamps */

 #endif
	/*
	* Copyright (c) 1982, 1986, 1993, 1994
	* 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 8.3 (Berkeley) 4/10/94
	* tcp_var.h,v 1.3 1994/08/21 05:27:39 paul Exp
	*/

	#ifndef _TCP_VAR_H_
	#define _TCP_VAR_H_

	#include "mbuf.h"
	#include "tcpip.h"
	#include "tcp_timer.h"

	/*
	* 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_short 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 */

	/* Make it static for now */
	/* struct tcpiphdr t_template; / skeletal packet for transmit */
	struct tcpiphdr t_template;

	struct socket t_socket; / back pointer to socket */
	/*
	* 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_int32_t snd_wnd; /* send window */
	/* receive sequence variables */
	u_int32_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) */
	u_int32_t snd_cwnd; /* congestion-controlled window */
	u_int32_t 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.
	*/
	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 t_rttmin; /* minimum rtt allowed */
	u_int32_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
	short 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_int32_t ts_recent; /* timestamp echo data */
	u_int32_t ts_recent_age; /* when last updated */
	tcp_seq last_ack_sent;

	};

	#define sototcpcb(so) ((so)->so_tcpcb)

	/*
	* 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 */

	/*
	* 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 macro assumes that the value of TCP_RTTVAR_SCALE
	* is the same as the multiplier for rttvar.
	*/
	#define TCP_REXMTVAL(tp) \
	(((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar)

	/*
	* 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_socachemiss; /* tcp_last_so misses */
	u_long tcps_didnuttin; /* Times tcp_output didn't do anything XXX */
	};

	extern struct tcpstat tcpstat; /* tcp statistics */
	extern u_int32_t tcp_now; /* for RFC 1323 timestamps */

	#endif