mirror of
https://github.com/qemu/qemu.git
synced 2024-11-25 11:53:39 +08:00
b6dce92e89
There is no need to have a second set of integral types. Replace them by the standard types from stdint.h. Signed-off-by: Stefan Weil <weil@mail.berlios.de> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
162 lines
6.5 KiB
C
162 lines
6.5 KiB
C
/*
|
|
* 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. 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 "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 */
|
|
|
|
struct tcpiphdr t_template; /* static skeletal packet for xmit */
|
|
|
|
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 */
|
|
uint32_t snd_wnd; /* send window */
|
|
/* receive sequence variables */
|
|
uint32_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) */
|
|
uint32_t snd_cwnd; /* congestion-controlled window */
|
|
uint32_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 */
|
|
uint32_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;
|
|
uint32_t ts_recent; /* timestamp echo data */
|
|
uint32_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)
|
|
|
|
#endif
|