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-rw-r--r--c/src/exec/libnetworking/netinet/tcp_timer.c387
1 files changed, 0 insertions, 387 deletions
diff --git a/c/src/exec/libnetworking/netinet/tcp_timer.c b/c/src/exec/libnetworking/netinet/tcp_timer.c
deleted file mode 100644
index 04d3d604e2..0000000000
--- a/c/src/exec/libnetworking/netinet/tcp_timer.c
+++ /dev/null
@@ -1,387 +0,0 @@
-/*
- * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
- * 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.
- *
- * @(#)tcp_timer.c 8.2 (Berkeley) 5/24/95
- * $Id$
- */
-
-#include "opt_tcpdebug.h"
-
-#ifndef TUBA_INCLUDE
-#include <sys/param.h>
-#include <sys/queue.h>
-#include <sys/systm.h>
-#include <sys/kernel.h>
-#include <sys/sysctl.h>
-#include <sys/malloc.h>
-#include <sys/mbuf.h>
-#include <sys/socket.h>
-#include <sys/socketvar.h>
-#include <sys/protosw.h>
-#include <sys/errno.h>
-
-#include <machine/cpu.h> /* before tcp_seq.h, for tcp_random18() */
-
-#include <net/if.h>
-#include <net/route.h>
-
-#include <netinet/in.h>
-#include <netinet/in_systm.h>
-#include <netinet/ip.h>
-#include <netinet/in_pcb.h>
-#include <netinet/ip_var.h>
-#include <netinet/tcp.h>
-#include <netinet/tcp_fsm.h>
-#include <netinet/tcp_seq.h>
-#include <netinet/tcp_timer.h>
-#include <netinet/tcp_var.h>
-#include <netinet/tcpip.h>
-#ifdef TCPDEBUG
-#include <netinet/tcp_debug.h>
-#endif
-
-int tcp_keepinit = TCPTV_KEEP_INIT;
-SYSCTL_INT(_net_inet_tcp, TCPCTL_KEEPINIT, keepinit,
- CTLFLAG_RW, &tcp_keepinit , 0, "");
-
-int tcp_keepidle = TCPTV_KEEP_IDLE;
-SYSCTL_INT(_net_inet_tcp, TCPCTL_KEEPIDLE, keepidle,
- CTLFLAG_RW, &tcp_keepidle , 0, "");
-
-static int tcp_keepintvl = TCPTV_KEEPINTVL;
-SYSCTL_INT(_net_inet_tcp, TCPCTL_KEEPINTVL, keepintvl,
- CTLFLAG_RW, &tcp_keepintvl , 0, "");
-
-static int always_keepalive = 0;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, always_keepalive,
- CTLFLAG_RW, &always_keepalive , 0, "");
-
-static int tcp_keepcnt = TCPTV_KEEPCNT;
- /* max idle probes */
-static int tcp_maxpersistidle = TCPTV_KEEP_IDLE;
- /* max idle time in persist */
-int tcp_maxidle;
-#else /* TUBA_INCLUDE */
-
-static int tcp_maxpersistidle;
-#endif /* TUBA_INCLUDE */
-
-/*
- * Fast timeout routine for processing delayed acks
- */
-void
-tcp_fasttimo()
-{
- register struct inpcb *inp;
- register struct tcpcb *tp;
- int s;
-
- s = splnet();
-
- for (inp = tcb.lh_first; inp != NULL; inp = inp->inp_list.le_next) {
- if ((tp = (struct tcpcb *)inp->inp_ppcb) &&
- (tp->t_flags & TF_DELACK)) {
- tp->t_flags &= ~TF_DELACK;
- tp->t_flags |= TF_ACKNOW;
- tcpstat.tcps_delack++;
- (void) tcp_output(tp);
- }
- }
- splx(s);
-}
-
-/*
- * Tcp protocol timeout routine called every 500 ms.
- * Updates the timers in all active tcb's and
- * causes finite state machine actions if timers expire.
- */
-void
-tcp_slowtimo()
-{
- register struct inpcb *ip, *ipnxt;
- register struct tcpcb *tp;
- register int i;
- int s;
-#ifdef TCPDEBUG
- int ostate;
-#endif
-
- s = splnet();
-
- tcp_maxidle = tcp_keepcnt * tcp_keepintvl;
-
- ip = tcb.lh_first;
- if (ip == NULL) {
- splx(s);
- return;
- }
- /*
- * Search through tcb's and update active timers.
- */
- for (; ip != NULL; ip = ipnxt) {
- ipnxt = ip->inp_list.le_next;
- tp = intotcpcb(ip);
- if (tp == 0 || tp->t_state == TCPS_LISTEN)
- continue;
- for (i = 0; i < TCPT_NTIMERS; i++) {
- if (tp->t_timer[i] && --tp->t_timer[i] == 0) {
-#ifdef TCPDEBUG
- ostate = tp->t_state;
-#endif
- tp = tcp_timers(tp, i);
- if (tp == NULL)
- goto tpgone;
-#ifdef TCPDEBUG
- if (tp->t_inpcb->inp_socket->so_options
- & SO_DEBUG)
- tcp_trace(TA_USER, ostate, tp,
- (struct tcpiphdr *)0,
- PRU_SLOWTIMO);
-#endif
- }
- }
- tp->t_idle++;
- tp->t_duration++;
- if (tp->t_rtt)
- tp->t_rtt++;
-tpgone:
- ;
- }
- tcp_iss += TCP_ISSINCR/PR_SLOWHZ; /* increment iss */
-#ifdef TCP_COMPAT_42
- if ((int)tcp_iss < 0)
- tcp_iss = TCP_ISSINCR; /* XXX */
-#endif
- tcp_now++; /* for timestamps */
- splx(s);
-}
-#ifndef TUBA_INCLUDE
-
-/*
- * Cancel all timers for TCP tp.
- */
-void
-tcp_canceltimers(tp)
- struct tcpcb *tp;
-{
- register int i;
-
- for (i = 0; i < TCPT_NTIMERS; i++)
- tp->t_timer[i] = 0;
-}
-
-int tcp_backoff[TCP_MAXRXTSHIFT + 1] =
- { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
-
-static int tcp_totbackoff = 511; /* sum of tcp_backoff[] */
-
-/*
- * TCP timer processing.
- */
-struct tcpcb *
-tcp_timers(tp, timer)
- register struct tcpcb *tp;
- int timer;
-{
- register int rexmt;
-
- switch (timer) {
-
- /*
- * 2 MSL timeout in shutdown went off. If we're closed but
- * still waiting for peer to close and connection has been idle
- * too long, or if 2MSL time is up from TIME_WAIT, delete connection
- * control block. Otherwise, check again in a bit.
- */
- case TCPT_2MSL:
- if (tp->t_state != TCPS_TIME_WAIT &&
- tp->t_idle <= tcp_maxidle)
- tp->t_timer[TCPT_2MSL] = tcp_keepintvl;
- else
- tp = tcp_close(tp);
- break;
-
- /*
- * Retransmission timer went off. Message has not
- * been acked within retransmit interval. Back off
- * to a longer retransmit interval and retransmit one segment.
- */
- case TCPT_REXMT:
- if (++tp->t_rxtshift > TCP_MAXRXTSHIFT) {
- tp->t_rxtshift = TCP_MAXRXTSHIFT;
- tcpstat.tcps_timeoutdrop++;
- tp = tcp_drop(tp, tp->t_softerror ?
- tp->t_softerror : ETIMEDOUT);
- break;
- }
- tcpstat.tcps_rexmttimeo++;
- rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift];
- TCPT_RANGESET(tp->t_rxtcur, rexmt,
- tp->t_rttmin, TCPTV_REXMTMAX);
- tp->t_timer[TCPT_REXMT] = tp->t_rxtcur;
- /*
- * If losing, let the lower level know and try for
- * a better route. Also, if we backed off this far,
- * our srtt estimate is probably bogus. Clobber it
- * so we'll take the next rtt measurement as our srtt;
- * move the current srtt into rttvar to keep the current
- * retransmit times until then.
- */
- if (tp->t_rxtshift > TCP_MAXRXTSHIFT / 4) {
- in_losing(tp->t_inpcb);
- tp->t_rttvar += (tp->t_srtt >> TCP_RTT_SHIFT);
- tp->t_srtt = 0;
- }
- tp->snd_nxt = tp->snd_una;
- /*
- * Force a segment to be sent.
- */
- tp->t_flags |= TF_ACKNOW;
- /*
- * If timing a segment in this window, stop the timer.
- */
- tp->t_rtt = 0;
- /*
- * Close the congestion window down to one segment
- * (we'll open it by one segment for each ack we get).
- * Since we probably have a window's worth of unacked
- * data accumulated, this "slow start" keeps us from
- * dumping all that data as back-to-back packets (which
- * might overwhelm an intermediate gateway).
- *
- * There are two phases to the opening: Initially we
- * open by one mss on each ack. This makes the window
- * size increase exponentially with time. If the
- * window is larger than the path can handle, this
- * exponential growth results in dropped packet(s)
- * almost immediately. To get more time between
- * drops but still "push" the network to take advantage
- * of improving conditions, we switch from exponential
- * to linear window opening at some threshhold size.
- * For a threshhold, we use half the current window
- * size, truncated to a multiple of the mss.
- *
- * (the minimum cwnd that will give us exponential
- * growth is 2 mss. We don't allow the threshhold
- * to go below this.)
- */
- {
- u_int win = min(tp->snd_wnd, tp->snd_cwnd) / 2 / tp->t_maxseg;
- if (win < 2)
- win = 2;
- tp->snd_cwnd = tp->t_maxseg;
- tp->snd_ssthresh = win * tp->t_maxseg;
- tp->t_dupacks = 0;
- }
- (void) tcp_output(tp);
- break;
-
- /*
- * Persistance timer into zero window.
- * Force a byte to be output, if possible.
- */
- case TCPT_PERSIST:
- tcpstat.tcps_persisttimeo++;
- /*
- * Hack: if the peer is dead/unreachable, we do not
- * time out if the window is closed. After a full
- * backoff, drop the connection if the idle time
- * (no responses to probes) reaches the maximum
- * backoff that we would use if retransmitting.
- */
- if (tp->t_rxtshift == TCP_MAXRXTSHIFT) {
- u_long maxidle = TCP_REXMTVAL(tp);
- if (maxidle < tp->t_rttmin)
- maxidle = tp->t_rttmin;
- maxidle *= tcp_totbackoff;
- if (tp->t_idle >= tcp_maxpersistidle ||
- tp->t_idle >= maxidle) {
- tcpstat.tcps_persistdrop++;
- tp = tcp_drop(tp, ETIMEDOUT);
- break;
- }
- }
- tcp_setpersist(tp);
- tp->t_force = 1;
- (void) tcp_output(tp);
- tp->t_force = 0;
- break;
-
- /*
- * Keep-alive timer went off; send something
- * or drop connection if idle for too long.
- */
- case TCPT_KEEP:
- tcpstat.tcps_keeptimeo++;
- if (tp->t_state < TCPS_ESTABLISHED)
- goto dropit;
- if ((always_keepalive ||
- tp->t_inpcb->inp_socket->so_options & SO_KEEPALIVE) &&
- tp->t_state <= TCPS_CLOSING) {
- if (tp->t_idle >= tcp_keepidle + tcp_maxidle)
- goto dropit;
- /*
- * Send a packet designed to force a response
- * if the peer is up and reachable:
- * either an ACK if the connection is still alive,
- * or an RST if the peer has closed the connection
- * due to timeout or reboot.
- * Using sequence number tp->snd_una-1
- * causes the transmitted zero-length segment
- * to lie outside the receive window;
- * by the protocol spec, this requires the
- * correspondent TCP to respond.
- */
- tcpstat.tcps_keepprobe++;
-#ifdef TCP_COMPAT_42
- /*
- * The keepalive packet must have nonzero length
- * to get a 4.2 host to respond.
- */
- tcp_respond(tp, tp->t_template, (struct mbuf *)NULL,
- tp->rcv_nxt - 1, tp->snd_una - 1, 0);
-#else
- tcp_respond(tp, tp->t_template, (struct mbuf *)NULL,
- tp->rcv_nxt, tp->snd_una - 1, 0);
-#endif
- tp->t_timer[TCPT_KEEP] = tcp_keepintvl;
- } else
- tp->t_timer[TCPT_KEEP] = tcp_keepidle;
- break;
- dropit:
- tcpstat.tcps_keepdrops++;
- tp = tcp_drop(tp, ETIMEDOUT);
- break;
- }
- return (tp);
-}
-#endif /* TUBA_INCLUDE */
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