/* $OpenBSD: spp_timer.h,v 1.3 2003/06/02 23:28:19 millert Exp $ */ /* $NetBSD: spp_timer.h,v 1.6 1995/03/26 20:36:22 jtc Exp $ */ /* * 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. 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