/* * Copyright (c) 1982, 1986, 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. * */ #ifndef NETINET_TCP_TIMERS_H #define NETINET_TCP_TIMERS_H /* * Definitions of the TCP timers. These timers are counted * down PR_SLOWHZ times a second. */ #define TCPT_NTIMERS 4 #define TCPT_REXMT 0 /* retransmission timer */ #define TCPT_PERSIST 1 /* presist timer */ #define TCPT_KEEP 2 /* keeplaive timer or conn est timer */ #define TCPT_2MSL 3 /* 2MSL timer or FIN_WAIT_2 timer */ /* * The TCPT_REXMT timer is used to force retransmissions. * The TCP has the TCPT_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 TCPT_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 TCPT_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 TCPT_PERSMIN time intervals, * but no more frequently than the current estimate of round-trip * packet time. The TCPT_PERSIST timer is cleared whenever we receive * a window update from the peer. * * The TCPT_KEEP timer is used to keep connections alive. If an * connection is idle (no segments received) for TCPTV_KEEP_INIT amount of time, * but not yet established, then we drop the connection. Once the connection * is established, if the connection is idle for TCPTV_KEEP_IDLE time * (and keepalives have been enabled on the socket), we begin to probe * the connection. 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 TCPT_KEEP * initiated segments we cannot elicit a response from a peer in TCPT_MAXIDLE * amount of time probing, then we drop the connection. */ /* * Time constants. */ #define TCPTV_MSL ( 30*PR_SLOWHZ ) /* max seg lifetime (hah!) */ #define TCPTV_SRTTBASE 0 /* base roundtrip time; * if 0, no idea yet */ #define TCPTV_SRTTDFLT ( 3*PR_SLOWHZ ) /* assumed RTT if no info */ #define TCPTV_PERSMIN ( 5*PR_SLOWHZ ) /* retransmit persistance */ #define TCPTV_PERSMAX ( 60*PR_SLOWHZ ) /* maximum persist interval */ #define TCPTV_KEEP_INIT ( 75*PR_SLOWHZ ) /* initial connect keep alive */ #define TCPTV_KEEP_IDLE (120*60*PR_SLOWHZ) /* dflt time before probing */ #define TCPTV_KEEPINTVL ( 75*PR_SLOWHZ ) /* default probe interval */ #define TCPTV_KEEPCNT 8 /* max probes before drop */ #define TCPTV_MIN ( 1*PR_SLOWHZ ) /* minimum allowable value */ #define TCPTV_REXMTMAX ( 64*PR_SLOWHZ ) /* max allowable REXMT value */ #define TCP_LINGERTIME 120 /* at most 2 minutes... */ #define TCP_MAXRXTSHIFT 12 /* maximum retransmits */ //#ifdef TCPTIMERS //char *tcptimers[] = // { "REXMT", "PERSIST", "KEEP", "2MSL" }; //#endif /* TCPTIMERS */ extern char *tcptimers[]; /* * Force a time value to be in a certain range. */ #define TCPT_RANGESET(tv, value, tvmin, tvmax) { \ (tv) = (value); \ if ((tv) < (tvmin)) \ (tv) = (tvmin); \ else if ((tv) > (tvmax)) \ (tv) = (tvmax); \ } //#ifdef _NETWORK_STACK extern int tcptv_keep_init; extern int tcp_keepidle; /* time before keepalive probes begin */ extern int tcp_keepintvl; /* time between keepalive probes */ extern int tcp_maxidle; /* time to drop after starting probes */ extern int tcp_ttl; /* time to live for TCP segs */ extern int tcp_backoff[]; //#endif /* _NETWORK_STACK */ #endif /* NETINET_TCP_TIMERS_H */