320 lines
13 KiB
C
320 lines
13 KiB
C
/* tcp_var.h - tcp variables header file */
|
|
|
|
/* Copyright 1984 - 2002 Wind River Systems, Inc. */
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
|
|
/*
|
|
modification history
|
|
--------------------
|
|
01g,05jun02,vvv replaced TF_PREV_SMALL with TF_EOB (SPR #72213)
|
|
01f,06mar02,vvv added new flag TF_PREV_SMALL (SPR #72213)
|
|
01e,10oct01,rae merge from truestack ver 01f, base 01c
|
|
01d,10nov00,spm merged from version 01d of tor3_x branch (SPR #31996 fix)
|
|
01c,31mar97,vin added changes for pcb hashlookups.
|
|
01b,30oct96,vin changed tcp_template to mbuf from tcp_iphdr so that dtom
|
|
wont be necessary.
|
|
01a,03mar96,vin created from BSD4.4 stuff, integrated with 02p of tcp_var.h
|
|
*/
|
|
|
|
#ifndef __INCtcp_varh
|
|
#define __INCtcp_varh
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* includes */
|
|
|
|
#include "netinet/tcp_timer.h"
|
|
#include "netinet/ip.h"
|
|
|
|
#if ((CPU_FAMILY==I960) && (defined __GNUC__))
|
|
#pragma align 1 /* tell gcc960 not to optimize alignments */
|
|
#endif /* CPU_FAMILY==I960 */
|
|
|
|
/* 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 */
|
|
#define TF_EOB 0x0400 /* for Nagle's - last chunk of */
|
|
/* a large data block? */
|
|
struct mbuf * 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 threshhold 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_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_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
|
|
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_long ts_recent; /* timestamp echo data */
|
|
u_long ts_recent_age; /* when last updated */
|
|
tcp_seq last_ack_sent;
|
|
|
|
/* Path MTU values */
|
|
u_int t_maxsize; /* max segment, ignoring send buffer */
|
|
};
|
|
|
|
#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 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)
|
|
|
|
/* 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_persistdrop; /* timeout in persist state */
|
|
u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */
|
|
};
|
|
|
|
#if ((CPU_FAMILY==I960) && (defined __GNUC__))
|
|
#pragma align 0 /* turn off alignment requirement */
|
|
#endif /* CPU_FAMILY==I960 */
|
|
|
|
#ifndef VIRTUAL_STACK
|
|
#define tcb tcpcb /* resolve the conflit tcb */
|
|
|
|
extern long tcpOutRsts; /* MIB-II Variable */
|
|
extern struct inpcbhead tcb; /* head of queue of active tcpcb's */
|
|
extern struct inpcbinfo tcbinfo;
|
|
IMPORT struct tcpstat tcpstat; /* tcp statistics */
|
|
extern u_long tcp_now; /* for RFC 1323 timestamps */
|
|
#endif
|
|
|
|
extern int tcp_attach (struct socket *);
|
|
extern void tcp_canceltimers (struct tcpcb *);
|
|
extern struct tcpcb * tcp_close (struct tcpcb *);
|
|
extern void tcp_ctlinput (int, struct sockaddr *, struct ip *);
|
|
extern int tcp_ctloutput (int, struct socket *, int, int, struct mbuf **);
|
|
extern struct tcpcb * tcp_disconnect (struct tcpcb *);
|
|
extern struct tcpcb * tcp_drop (struct tcpcb *, int);
|
|
extern void tcp_dooptions (struct tcpcb *, u_char *, int, struct tcpiphdr *,
|
|
int *, u_long *, u_long *);
|
|
extern void tcp_drain (void);
|
|
extern void tcp_fasttimo (void);
|
|
extern void tcp_init (void);
|
|
extern void tcp_input (struct mbuf *, int);
|
|
extern int tcp_mss (struct tcpcb *, u_int);
|
|
extern struct tcpcb * tcp_newtcpcb (struct inpcb *);
|
|
extern void tcp_notify (struct inpcb *, int);
|
|
extern int tcp_output (struct tcpcb *);
|
|
extern void tcp_pulloutofband (struct socket *, struct tcpiphdr *,
|
|
struct mbuf *);
|
|
extern void tcp_quench (struct inpcb *, int);
|
|
extern void tcp_updatemtu (struct inpcb *, int);
|
|
extern int tcp_reass (struct tcpcb *, struct tcpiphdr *, struct mbuf *);
|
|
extern void tcp_respond (struct tcpcb *, struct tcpiphdr *, struct mbuf *,
|
|
u_long, u_long, int);
|
|
extern void tcp_setpersist (struct tcpcb *);
|
|
extern void tcp_slowtimo (void);
|
|
extern int tcpRandHookAdd(FUNCPTR pTcpRandFunc);
|
|
extern void tcpRandHookDelete(void);
|
|
extern struct mbuf * tcp_template (struct tcpcb *);
|
|
extern struct tcpcb * tcp_timers (struct tcpcb *, int);
|
|
extern struct tcpcb * tcp_usrclosed (struct tcpcb *);
|
|
extern int tcp_usrreq (struct socket *, int, struct mbuf *, struct mbuf *,
|
|
struct mbuf *);
|
|
extern void tcp_xmit_timer (struct tcpcb *, int);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* __INCtcp_varh */
|