build-sys: move slirp as git submodule project

The slirp project is now hosted on freedesktop at:
https://gitlab.freedesktop.org/slirp.

The libslirp source was extracted from qemu/slirp filtered through
clang-format (available in project tree). The qemu slirp directory can
be swapped by a git submodule.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20190424110041.8175-3-marcandre.lureau@redhat.com>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

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