+++ /dev/null
-/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
- *
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-/*
- * Copyright (c) 1982, 1986, 1988, 1993
- * 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.
- *
- * @(#)spp_timer.h 8.1 (Berkeley) 6/10/93
- */
-
-/*
- * Definitions of the SPP timers. These timers are counted
- * down PR_SLOWHZ times a second.
- */
-#define SPPT_NTIMERS 4
-
-#define SPPT_REXMT 0 /* retransmit */
-#define SPPT_PERSIST 1 /* retransmit persistance */
-#define SPPT_KEEP 2 /* keep alive */
-#define SPPT_2MSL 3 /* 2*msl quiet time timer */
-
-/*
- * The SPPT_REXMT timer is used to force retransmissions.
- * The SPP has the SPPT_REXMT timer set whenever segments
- * have been sent for which ACKs are expected but not yet
- * received. If an ACK is received which advances tp->snd_una,
- * then the retransmit timer is cleared (if there are no more
- * outstanding segments) or reset to the base value (if there
- * are more ACKs expected). Whenever the retransmit timer goes off,
- * we retransmit one unacknowledged segment, and do a backoff
- * on the retransmit timer.
- *
- * The SPPT_PERSIST timer is used to keep window size information
- * flowing even if the window goes shut. If all previous transmissions
- * have been acknowledged (so that there are no retransmissions in progress),
- * and the window is too small to bother sending anything, then we start
- * the SPPT_PERSIST timer. When it expires, if the window is nonzero,
- * we go to transmit state. Otherwise, at intervals send a single byte
- * into the peer's window to force him to update our window information.
- * We do this at most as often as SPPT_PERSMIN time intervals,
- * but no more frequently than the current estimate of round-trip
- * packet time. The SPPT_PERSIST timer is cleared whenever we receive
- * a window update from the peer.
- *
- * The SPPT_KEEP timer is used to keep connections alive. If an
- * connection is idle (no segments received) for SPPTV_KEEP amount of time,
- * but not yet established, then we drop the connection. If the connection
- * is established, then we force the peer to send us a segment by sending:
- * <SEQ=SND.UNA-1><ACK=RCV.NXT><CTL=ACK>
- * This segment is (deliberately) outside the window, and should elicit
- * an ack segment in response from the peer. If, despite the SPPT_KEEP
- * initiated segments we cannot elicit a response from a peer in SPPT_MAXIDLE
- * amount of time, then we drop the connection.
- */
-
-#define SPP_TTL 30 /* default time to live for SPP segs */
-/*
- * Time constants.
- */
-#define SPPTV_MSL ( 15*PR_SLOWHZ) /* max seg lifetime */
-#define SPPTV_SRTTBASE 0 /* base roundtrip time;
- if 0, no idea yet */
-#define SPPTV_SRTTDFLT ( 3*PR_SLOWHZ) /* assumed RTT if no info */
-
-#define SPPTV_PERSMIN ( 5*PR_SLOWHZ) /* retransmit persistance */
-#define SPPTV_PERSMAX ( 60*PR_SLOWHZ) /* maximum persist interval */
-
-#define SPPTV_KEEP ( 75*PR_SLOWHZ) /* keep alive - 75 secs */
-#define SPPTV_MAXIDLE ( 8*SPPTV_KEEP) /* maximum allowable idle
- time before drop conn */
-
-#define SPPTV_MIN ( 1*PR_SLOWHZ) /* minimum allowable value */
-#define SPPTV_REXMTMAX ( 64*PR_SLOWHZ) /* max allowable REXMT value */
-
-#define SPP_LINGERTIME 120 /* linger at most 2 minutes */
-
-#define SPP_MAXRXTSHIFT 12 /* maximum retransmits */
-
-#ifdef SPPTIMERS
-char *spptimers[] =
- { "REXMT", "PERSIST", "KEEP", "2MSL" };
-#endif
-
-/*
- * Force a time value to be in a certain range.
- */
-#define SPPT_RANGESET(tv, value, tvmin, tvmax) { \
- (tv) = (value); \
- if ((tv) < (tvmin)) \
- (tv) = (tvmin); \
- else if ((tv) > (tvmax)) \
- (tv) = (tvmax); \
-}
-
-#ifdef KERNEL
-extern int spp_backoff[];
-#endif
projects / apple / xnu.git / blobdiff