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Diffstat (limited to 'slirp/src/tcp_var.h')
| m--------- | slirp | 0 | ||||
| -rw-r--r-- | slirp/src/tcp_var.h | 162 |
2 files changed, 0 insertions, 162 deletions
diff --git a/slirp b/slirp new file mode 160000 +Subproject 59a1b1f165458c2acb7ff0525b543945f741622 diff --git a/slirp/src/tcp_var.h b/slirp/src/tcp_var.h deleted file mode 100644 index 162be6e95e..0000000000 --- a/slirp/src/tcp_var.h +++ /dev/null @@ -1,162 +0,0 @@ -/* SPDX-License-Identifier: BSD-3-Clause */ -/* - * 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 */ - uint16_t t_maxseg; /* maximum segment size */ - uint8_t t_force; /* 1 if forcing out a byte */ - uint16_t 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 */ - uint16_t t_rttmin; /* minimum rtt allowed */ - uint32_t max_sndwnd; /* largest window peer has offered */ - -/* out-of-band data */ - uint8_t t_oobflags; /* have some */ - uint8_t t_iobc; /* input character */ -#define TCPOOB_HAVEDATA 0x01 -#define TCPOOB_HADDATA 0x02 - short t_softerror; /* possible error not yet reported */ - -/* RFC 1323 variables */ - uint8_t snd_scale; /* window scaling for send window */ - uint8_t rcv_scale; /* window scaling for recv window */ - uint8_t request_r_scale; /* pending window scaling */ - uint8_t 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 |