ff94500855
Until this change there were two places where we would free tcpcb - tcp_discardcb() in case if all timers are drained and tcp_timer_discard() otherwise. They were pretty much copy-n-paste, except that in the default case we would run tcp_hc_update(). Merge this into single function tcp_freecb() and move new short version of tcp_timer_discard() to tcp_timer.c and make it static. Reviewed by: rrs, hselasky Differential revision: https://reviews.freebsd.org/D32965
1111 lines
31 KiB
C
1111 lines
31 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)tcp_timer.c 8.2 (Berkeley) 5/24/95
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_tcpdebug.h"
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#include "opt_rss.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mbuf.h>
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#include <sys/mutex.h>
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#include <sys/protosw.h>
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#include <sys/smp.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/rss_config.h>
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#include <net/vnet.h>
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#include <net/netisr.h>
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#include <netinet/in.h>
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#include <netinet/in_kdtrace.h>
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#include <netinet/in_pcb.h>
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#include <netinet/in_rss.h>
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#include <netinet/in_systm.h>
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#ifdef INET6
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#include <netinet6/in6_pcb.h>
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#endif
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#include <netinet/ip_var.h>
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#include <netinet/tcp.h>
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#include <netinet/tcp_fsm.h>
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#include <netinet/tcp_log_buf.h>
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#include <netinet/tcp_timer.h>
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#include <netinet/tcp_var.h>
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#include <netinet/tcp_seq.h>
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#include <netinet/cc/cc.h>
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#ifdef INET6
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#include <netinet6/tcp6_var.h>
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#endif
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#include <netinet/tcpip.h>
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#ifdef TCPDEBUG
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#include <netinet/tcp_debug.h>
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#endif
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int tcp_persmin;
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SYSCTL_PROC(_net_inet_tcp, OID_AUTO, persmin,
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CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
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&tcp_persmin, 0, sysctl_msec_to_ticks, "I",
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"minimum persistence interval");
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int tcp_persmax;
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SYSCTL_PROC(_net_inet_tcp, OID_AUTO, persmax,
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CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
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&tcp_persmax, 0, sysctl_msec_to_ticks, "I",
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"maximum persistence interval");
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int tcp_keepinit;
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SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPINIT, keepinit,
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CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
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&tcp_keepinit, 0, sysctl_msec_to_ticks, "I",
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"time to establish connection");
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int tcp_keepidle;
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SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPIDLE, keepidle,
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CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
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&tcp_keepidle, 0, sysctl_msec_to_ticks, "I",
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"time before keepalive probes begin");
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int tcp_keepintvl;
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SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPINTVL, keepintvl,
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CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
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&tcp_keepintvl, 0, sysctl_msec_to_ticks, "I",
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"time between keepalive probes");
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int tcp_delacktime;
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SYSCTL_PROC(_net_inet_tcp, TCPCTL_DELACKTIME, delacktime,
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CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
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&tcp_delacktime, 0, sysctl_msec_to_ticks, "I",
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"Time before a delayed ACK is sent");
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int tcp_msl;
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SYSCTL_PROC(_net_inet_tcp, OID_AUTO, msl,
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CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
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&tcp_msl, 0, sysctl_msec_to_ticks, "I",
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"Maximum segment lifetime");
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int tcp_rexmit_initial;
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SYSCTL_PROC(_net_inet_tcp, OID_AUTO, rexmit_initial,
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CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
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&tcp_rexmit_initial, 0, sysctl_msec_to_ticks, "I",
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"Initial Retransmission Timeout");
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int tcp_rexmit_min;
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SYSCTL_PROC(_net_inet_tcp, OID_AUTO, rexmit_min,
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CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
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&tcp_rexmit_min, 0, sysctl_msec_to_ticks, "I",
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"Minimum Retransmission Timeout");
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int tcp_rexmit_slop;
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SYSCTL_PROC(_net_inet_tcp, OID_AUTO, rexmit_slop,
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CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
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&tcp_rexmit_slop, 0, sysctl_msec_to_ticks, "I",
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"Retransmission Timer Slop");
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VNET_DEFINE(int, tcp_always_keepalive) = 1;
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SYSCTL_INT(_net_inet_tcp, OID_AUTO, always_keepalive, CTLFLAG_VNET|CTLFLAG_RW,
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&VNET_NAME(tcp_always_keepalive) , 0,
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"Assume SO_KEEPALIVE on all TCP connections");
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int tcp_fast_finwait2_recycle = 0;
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SYSCTL_INT(_net_inet_tcp, OID_AUTO, fast_finwait2_recycle, CTLFLAG_RW,
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&tcp_fast_finwait2_recycle, 0,
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"Recycle closed FIN_WAIT_2 connections faster");
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int tcp_finwait2_timeout;
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SYSCTL_PROC(_net_inet_tcp, OID_AUTO, finwait2_timeout,
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CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
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&tcp_finwait2_timeout, 0, sysctl_msec_to_ticks, "I",
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"FIN-WAIT2 timeout");
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int tcp_keepcnt = TCPTV_KEEPCNT;
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SYSCTL_INT(_net_inet_tcp, OID_AUTO, keepcnt, CTLFLAG_RW, &tcp_keepcnt, 0,
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"Number of keepalive probes to send");
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/* max idle probes */
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int tcp_maxpersistidle;
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int tcp_rexmit_drop_options = 0;
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SYSCTL_INT(_net_inet_tcp, OID_AUTO, rexmit_drop_options, CTLFLAG_RW,
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&tcp_rexmit_drop_options, 0,
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"Drop TCP options from 3rd and later retransmitted SYN");
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VNET_DEFINE(int, tcp_pmtud_blackhole_detect);
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SYSCTL_INT(_net_inet_tcp, OID_AUTO, pmtud_blackhole_detection,
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CTLFLAG_RW|CTLFLAG_VNET,
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&VNET_NAME(tcp_pmtud_blackhole_detect), 0,
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"Path MTU Discovery Black Hole Detection Enabled");
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#ifdef INET
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VNET_DEFINE(int, tcp_pmtud_blackhole_mss) = 1200;
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SYSCTL_INT(_net_inet_tcp, OID_AUTO, pmtud_blackhole_mss,
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CTLFLAG_RW|CTLFLAG_VNET,
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&VNET_NAME(tcp_pmtud_blackhole_mss), 0,
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"Path MTU Discovery Black Hole Detection lowered MSS");
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#endif
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#ifdef INET6
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VNET_DEFINE(int, tcp_v6pmtud_blackhole_mss) = 1220;
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SYSCTL_INT(_net_inet_tcp, OID_AUTO, v6pmtud_blackhole_mss,
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CTLFLAG_RW|CTLFLAG_VNET,
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&VNET_NAME(tcp_v6pmtud_blackhole_mss), 0,
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"Path MTU Discovery IPv6 Black Hole Detection lowered MSS");
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#endif
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#ifdef RSS
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static int per_cpu_timers = 1;
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#else
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static int per_cpu_timers = 0;
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#endif
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SYSCTL_INT(_net_inet_tcp, OID_AUTO, per_cpu_timers, CTLFLAG_RW,
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&per_cpu_timers , 0, "run tcp timers on all cpus");
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/*
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* Map the given inp to a CPU id.
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*
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* This queries RSS if it's compiled in, else it defaults to the current
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* CPU ID.
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*/
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inline int
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inp_to_cpuid(struct inpcb *inp)
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{
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u_int cpuid;
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#ifdef RSS
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if (per_cpu_timers) {
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cpuid = rss_hash2cpuid(inp->inp_flowid, inp->inp_flowtype);
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if (cpuid == NETISR_CPUID_NONE)
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return (curcpu); /* XXX */
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else
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return (cpuid);
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}
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#else
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/* Legacy, pre-RSS behaviour */
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if (per_cpu_timers) {
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/*
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* We don't have a flowid -> cpuid mapping, so cheat and
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* just map unknown cpuids to curcpu. Not the best, but
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* apparently better than defaulting to swi 0.
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*/
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cpuid = inp->inp_flowid % (mp_maxid + 1);
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if (! CPU_ABSENT(cpuid))
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return (cpuid);
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return (curcpu);
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}
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#endif
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/* Default for RSS and non-RSS - cpuid 0 */
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else {
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return (0);
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}
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}
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/*
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* Tcp protocol timeout routine called every 500 ms.
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* Updates timestamps used for TCP
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* causes finite state machine actions if timers expire.
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*/
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void
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tcp_slowtimo(void)
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{
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VNET_ITERATOR_DECL(vnet_iter);
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VNET_LIST_RLOCK_NOSLEEP();
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VNET_FOREACH(vnet_iter) {
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CURVNET_SET(vnet_iter);
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(void) tcp_tw_2msl_scan(0);
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CURVNET_RESTORE();
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}
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VNET_LIST_RUNLOCK_NOSLEEP();
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}
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int tcp_backoff[TCP_MAXRXTSHIFT + 1] =
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{ 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 512, 512, 512 };
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int tcp_totbackoff = 2559; /* sum of tcp_backoff[] */
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/*
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* TCP timer processing.
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*/
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void
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tcp_timer_delack(void *xtp)
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{
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struct epoch_tracker et;
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struct tcpcb *tp = xtp;
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struct inpcb *inp;
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CURVNET_SET(tp->t_vnet);
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inp = tp->t_inpcb;
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KASSERT(inp != NULL, ("%s: tp %p tp->t_inpcb == NULL", __func__, tp));
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INP_WLOCK(inp);
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if (callout_pending(&tp->t_timers->tt_delack) ||
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!callout_active(&tp->t_timers->tt_delack)) {
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INP_WUNLOCK(inp);
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CURVNET_RESTORE();
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return;
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}
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callout_deactivate(&tp->t_timers->tt_delack);
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if ((inp->inp_flags & INP_DROPPED) != 0) {
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INP_WUNLOCK(inp);
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CURVNET_RESTORE();
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return;
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}
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tp->t_flags |= TF_ACKNOW;
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TCPSTAT_INC(tcps_delack);
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NET_EPOCH_ENTER(et);
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(void) tp->t_fb->tfb_tcp_output(tp);
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INP_WUNLOCK(inp);
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NET_EPOCH_EXIT(et);
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CURVNET_RESTORE();
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}
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void
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tcp_inpinfo_lock_del(struct inpcb *inp, struct tcpcb *tp)
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{
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if (inp && tp != NULL)
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INP_WUNLOCK(inp);
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}
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void
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tcp_timer_2msl(void *xtp)
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{
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struct tcpcb *tp = xtp;
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struct inpcb *inp;
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struct epoch_tracker et;
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CURVNET_SET(tp->t_vnet);
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#ifdef TCPDEBUG
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int ostate;
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ostate = tp->t_state;
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#endif
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inp = tp->t_inpcb;
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KASSERT(inp != NULL, ("%s: tp %p tp->t_inpcb == NULL", __func__, tp));
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INP_WLOCK(inp);
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tcp_free_sackholes(tp);
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if (callout_pending(&tp->t_timers->tt_2msl) ||
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!callout_active(&tp->t_timers->tt_2msl)) {
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INP_WUNLOCK(tp->t_inpcb);
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CURVNET_RESTORE();
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return;
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}
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callout_deactivate(&tp->t_timers->tt_2msl);
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if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
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INP_WUNLOCK(inp);
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CURVNET_RESTORE();
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return;
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}
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KASSERT((tp->t_timers->tt_flags & TT_STOPPED) == 0,
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("%s: tp %p tcpcb can't be stopped here", __func__, tp));
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/*
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* 2 MSL timeout in shutdown went off. If we're closed but
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* still waiting for peer to close and connection has been idle
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* too long delete connection control block. Otherwise, check
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* again in a bit.
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*
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* If fastrecycle of FIN_WAIT_2, in FIN_WAIT_2 and receiver has closed,
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* there's no point in hanging onto FIN_WAIT_2 socket. Just close it.
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* Ignore fact that there were recent incoming segments.
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*/
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if (tcp_fast_finwait2_recycle && tp->t_state == TCPS_FIN_WAIT_2 &&
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tp->t_inpcb && tp->t_inpcb->inp_socket &&
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(tp->t_inpcb->inp_socket->so_rcv.sb_state & SBS_CANTRCVMORE)) {
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TCPSTAT_INC(tcps_finwait2_drops);
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NET_EPOCH_ENTER(et);
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tp = tcp_close(tp);
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NET_EPOCH_EXIT(et);
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tcp_inpinfo_lock_del(inp, tp);
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goto out;
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} else {
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if (ticks - tp->t_rcvtime <= TP_MAXIDLE(tp)) {
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callout_reset(&tp->t_timers->tt_2msl,
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TP_KEEPINTVL(tp), tcp_timer_2msl, tp);
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} else {
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NET_EPOCH_ENTER(et);
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tp = tcp_close(tp);
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NET_EPOCH_EXIT(et);
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tcp_inpinfo_lock_del(inp, tp);
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goto out;
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}
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}
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#ifdef TCPDEBUG
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if (tp != NULL && (tp->t_inpcb->inp_socket->so_options & SO_DEBUG))
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tcp_trace(TA_USER, ostate, tp, (void *)0, (struct tcphdr *)0,
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PRU_SLOWTIMO);
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#endif
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TCP_PROBE2(debug__user, tp, PRU_SLOWTIMO);
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|
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if (tp != NULL)
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INP_WUNLOCK(inp);
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out:
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CURVNET_RESTORE();
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}
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|
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void
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tcp_timer_keep(void *xtp)
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{
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struct tcpcb *tp = xtp;
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struct tcptemp *t_template;
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struct inpcb *inp;
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struct epoch_tracker et;
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CURVNET_SET(tp->t_vnet);
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#ifdef TCPDEBUG
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int ostate;
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ostate = tp->t_state;
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#endif
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inp = tp->t_inpcb;
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KASSERT(inp != NULL, ("%s: tp %p tp->t_inpcb == NULL", __func__, tp));
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INP_WLOCK(inp);
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if (callout_pending(&tp->t_timers->tt_keep) ||
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!callout_active(&tp->t_timers->tt_keep)) {
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INP_WUNLOCK(inp);
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CURVNET_RESTORE();
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return;
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}
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callout_deactivate(&tp->t_timers->tt_keep);
|
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if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
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INP_WUNLOCK(inp);
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CURVNET_RESTORE();
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return;
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}
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KASSERT((tp->t_timers->tt_flags & TT_STOPPED) == 0,
|
|
("%s: tp %p tcpcb can't be stopped here", __func__, tp));
|
|
|
|
/*
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|
* Because we don't regularly reset the keepalive callout in
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|
* the ESTABLISHED state, it may be that we don't actually need
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|
* to send a keepalive yet. If that occurs, schedule another
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* call for the next time the keepalive timer might expire.
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*/
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if (TCPS_HAVEESTABLISHED(tp->t_state)) {
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u_int idletime;
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idletime = ticks - tp->t_rcvtime;
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if (idletime < TP_KEEPIDLE(tp)) {
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callout_reset(&tp->t_timers->tt_keep,
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TP_KEEPIDLE(tp) - idletime, tcp_timer_keep, tp);
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INP_WUNLOCK(inp);
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CURVNET_RESTORE();
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return;
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}
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}
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|
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/*
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* Keep-alive timer went off; send something
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* or drop connection if idle for too long.
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*/
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TCPSTAT_INC(tcps_keeptimeo);
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if (tp->t_state < TCPS_ESTABLISHED)
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goto dropit;
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if ((V_tcp_always_keepalive ||
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inp->inp_socket->so_options & SO_KEEPALIVE) &&
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tp->t_state <= TCPS_CLOSING) {
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if (ticks - tp->t_rcvtime >= TP_KEEPIDLE(tp) + TP_MAXIDLE(tp))
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goto dropit;
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/*
|
|
* 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_INC(tcps_keepprobe);
|
|
t_template = tcpip_maketemplate(inp);
|
|
if (t_template) {
|
|
NET_EPOCH_ENTER(et);
|
|
tcp_respond(tp, t_template->tt_ipgen,
|
|
&t_template->tt_t, (struct mbuf *)NULL,
|
|
tp->rcv_nxt, tp->snd_una - 1, 0);
|
|
NET_EPOCH_EXIT(et);
|
|
free(t_template, M_TEMP);
|
|
}
|
|
callout_reset(&tp->t_timers->tt_keep, TP_KEEPINTVL(tp),
|
|
tcp_timer_keep, tp);
|
|
} else
|
|
callout_reset(&tp->t_timers->tt_keep, TP_KEEPIDLE(tp),
|
|
tcp_timer_keep, tp);
|
|
|
|
#ifdef TCPDEBUG
|
|
if (inp->inp_socket->so_options & SO_DEBUG)
|
|
tcp_trace(TA_USER, ostate, tp, (void *)0, (struct tcphdr *)0,
|
|
PRU_SLOWTIMO);
|
|
#endif
|
|
TCP_PROBE2(debug__user, tp, PRU_SLOWTIMO);
|
|
INP_WUNLOCK(inp);
|
|
CURVNET_RESTORE();
|
|
return;
|
|
|
|
dropit:
|
|
TCPSTAT_INC(tcps_keepdrops);
|
|
NET_EPOCH_ENTER(et);
|
|
tp = tcp_drop(tp, ETIMEDOUT);
|
|
|
|
#ifdef TCPDEBUG
|
|
if (tp != NULL && (tp->t_inpcb->inp_socket->so_options & SO_DEBUG))
|
|
tcp_trace(TA_USER, ostate, tp, (void *)0, (struct tcphdr *)0,
|
|
PRU_SLOWTIMO);
|
|
#endif
|
|
TCP_PROBE2(debug__user, tp, PRU_SLOWTIMO);
|
|
NET_EPOCH_EXIT(et);
|
|
tcp_inpinfo_lock_del(inp, tp);
|
|
CURVNET_RESTORE();
|
|
}
|
|
|
|
void
|
|
tcp_timer_persist(void *xtp)
|
|
{
|
|
struct tcpcb *tp = xtp;
|
|
struct inpcb *inp;
|
|
struct epoch_tracker et;
|
|
CURVNET_SET(tp->t_vnet);
|
|
#ifdef TCPDEBUG
|
|
int ostate;
|
|
|
|
ostate = tp->t_state;
|
|
#endif
|
|
inp = tp->t_inpcb;
|
|
KASSERT(inp != NULL, ("%s: tp %p tp->t_inpcb == NULL", __func__, tp));
|
|
INP_WLOCK(inp);
|
|
if (callout_pending(&tp->t_timers->tt_persist) ||
|
|
!callout_active(&tp->t_timers->tt_persist)) {
|
|
INP_WUNLOCK(inp);
|
|
CURVNET_RESTORE();
|
|
return;
|
|
}
|
|
callout_deactivate(&tp->t_timers->tt_persist);
|
|
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
|
|
INP_WUNLOCK(inp);
|
|
CURVNET_RESTORE();
|
|
return;
|
|
}
|
|
KASSERT((tp->t_timers->tt_flags & TT_STOPPED) == 0,
|
|
("%s: tp %p tcpcb can't be stopped here", __func__, tp));
|
|
/*
|
|
* Persistence timer into zero window.
|
|
* Force a byte to be output, if possible.
|
|
*/
|
|
TCPSTAT_INC(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 &&
|
|
(ticks - tp->t_rcvtime >= tcp_maxpersistidle ||
|
|
ticks - tp->t_rcvtime >= TCP_REXMTVAL(tp) * tcp_totbackoff)) {
|
|
TCPSTAT_INC(tcps_persistdrop);
|
|
NET_EPOCH_ENTER(et);
|
|
tp = tcp_drop(tp, ETIMEDOUT);
|
|
NET_EPOCH_EXIT(et);
|
|
tcp_inpinfo_lock_del(inp, tp);
|
|
goto out;
|
|
}
|
|
/*
|
|
* If the user has closed the socket then drop a persisting
|
|
* connection after a much reduced timeout.
|
|
*/
|
|
if (tp->t_state > TCPS_CLOSE_WAIT &&
|
|
(ticks - tp->t_rcvtime) >= TCPTV_PERSMAX) {
|
|
TCPSTAT_INC(tcps_persistdrop);
|
|
NET_EPOCH_ENTER(et);
|
|
tp = tcp_drop(tp, ETIMEDOUT);
|
|
NET_EPOCH_EXIT(et);
|
|
tcp_inpinfo_lock_del(inp, tp);
|
|
goto out;
|
|
}
|
|
tcp_setpersist(tp);
|
|
tp->t_flags |= TF_FORCEDATA;
|
|
NET_EPOCH_ENTER(et);
|
|
(void) tp->t_fb->tfb_tcp_output(tp);
|
|
NET_EPOCH_EXIT(et);
|
|
tp->t_flags &= ~TF_FORCEDATA;
|
|
|
|
#ifdef TCPDEBUG
|
|
if (tp != NULL && tp->t_inpcb->inp_socket->so_options & SO_DEBUG)
|
|
tcp_trace(TA_USER, ostate, tp, NULL, NULL, PRU_SLOWTIMO);
|
|
#endif
|
|
TCP_PROBE2(debug__user, tp, PRU_SLOWTIMO);
|
|
INP_WUNLOCK(inp);
|
|
out:
|
|
CURVNET_RESTORE();
|
|
}
|
|
|
|
void
|
|
tcp_timer_rexmt(void * xtp)
|
|
{
|
|
struct tcpcb *tp = xtp;
|
|
CURVNET_SET(tp->t_vnet);
|
|
int rexmt;
|
|
struct inpcb *inp;
|
|
struct epoch_tracker et;
|
|
bool isipv6;
|
|
#ifdef TCPDEBUG
|
|
int ostate;
|
|
|
|
ostate = tp->t_state;
|
|
#endif
|
|
inp = tp->t_inpcb;
|
|
KASSERT(inp != NULL, ("%s: tp %p tp->t_inpcb == NULL", __func__, tp));
|
|
INP_WLOCK(inp);
|
|
if (callout_pending(&tp->t_timers->tt_rexmt) ||
|
|
!callout_active(&tp->t_timers->tt_rexmt)) {
|
|
INP_WUNLOCK(inp);
|
|
CURVNET_RESTORE();
|
|
return;
|
|
}
|
|
callout_deactivate(&tp->t_timers->tt_rexmt);
|
|
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
|
|
INP_WUNLOCK(inp);
|
|
CURVNET_RESTORE();
|
|
return;
|
|
}
|
|
KASSERT((tp->t_timers->tt_flags & TT_STOPPED) == 0,
|
|
("%s: tp %p tcpcb can't be stopped here", __func__, tp));
|
|
tcp_free_sackholes(tp);
|
|
TCP_LOG_EVENT(tp, NULL, NULL, NULL, TCP_LOG_RTO, 0, 0, NULL, false);
|
|
if (tp->t_fb->tfb_tcp_rexmit_tmr) {
|
|
/* The stack has a timer action too. */
|
|
(*tp->t_fb->tfb_tcp_rexmit_tmr)(tp);
|
|
}
|
|
/*
|
|
* Retransmission timer went off. Message has not
|
|
* been acked within retransmit interval. Back off
|
|
* to a longer retransmit interval and retransmit one segment.
|
|
*/
|
|
if (++tp->t_rxtshift > TCP_MAXRXTSHIFT) {
|
|
tp->t_rxtshift = TCP_MAXRXTSHIFT;
|
|
TCPSTAT_INC(tcps_timeoutdrop);
|
|
NET_EPOCH_ENTER(et);
|
|
tp = tcp_drop(tp, ETIMEDOUT);
|
|
NET_EPOCH_EXIT(et);
|
|
tcp_inpinfo_lock_del(inp, tp);
|
|
goto out;
|
|
}
|
|
if (tp->t_state == TCPS_SYN_SENT) {
|
|
/*
|
|
* If the SYN was retransmitted, indicate CWND to be
|
|
* limited to 1 segment in cc_conn_init().
|
|
*/
|
|
tp->snd_cwnd = 1;
|
|
} else if (tp->t_rxtshift == 1) {
|
|
/*
|
|
* first retransmit; record ssthresh and cwnd so they can
|
|
* be recovered if this turns out to be a "bad" retransmit.
|
|
* A retransmit is considered "bad" if an ACK for this
|
|
* segment is received within RTT/2 interval; the assumption
|
|
* here is that the ACK was already in flight. See
|
|
* "On Estimating End-to-End Network Path Properties" by
|
|
* Allman and Paxson for more details.
|
|
*/
|
|
tp->snd_cwnd_prev = tp->snd_cwnd;
|
|
tp->snd_ssthresh_prev = tp->snd_ssthresh;
|
|
tp->snd_recover_prev = tp->snd_recover;
|
|
if (IN_FASTRECOVERY(tp->t_flags))
|
|
tp->t_flags |= TF_WASFRECOVERY;
|
|
else
|
|
tp->t_flags &= ~TF_WASFRECOVERY;
|
|
if (IN_CONGRECOVERY(tp->t_flags))
|
|
tp->t_flags |= TF_WASCRECOVERY;
|
|
else
|
|
tp->t_flags &= ~TF_WASCRECOVERY;
|
|
if ((tp->t_flags & TF_RCVD_TSTMP) == 0)
|
|
tp->t_badrxtwin = ticks + (tp->t_srtt >> (TCP_RTT_SHIFT + 1));
|
|
/* In the event that we've negotiated timestamps
|
|
* badrxtwin will be set to the value that we set
|
|
* the retransmitted packet's to_tsval to by tcp_output
|
|
*/
|
|
tp->t_flags |= TF_PREVVALID;
|
|
} else
|
|
tp->t_flags &= ~TF_PREVVALID;
|
|
TCPSTAT_INC(tcps_rexmttimeo);
|
|
if ((tp->t_state == TCPS_SYN_SENT) ||
|
|
(tp->t_state == TCPS_SYN_RECEIVED))
|
|
rexmt = tcp_rexmit_initial * tcp_backoff[tp->t_rxtshift];
|
|
else
|
|
rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift];
|
|
TCPT_RANGESET(tp->t_rxtcur, rexmt,
|
|
tp->t_rttmin, TCPTV_REXMTMAX);
|
|
|
|
/*
|
|
* We enter the path for PLMTUD if connection is established or, if
|
|
* connection is FIN_WAIT_1 status, reason for the last is that if
|
|
* amount of data we send is very small, we could send it in couple of
|
|
* packets and process straight to FIN. In that case we won't catch
|
|
* ESTABLISHED state.
|
|
*/
|
|
#ifdef INET6
|
|
isipv6 = (tp->t_inpcb->inp_vflag & INP_IPV6) ? true : false;
|
|
#else
|
|
isipv6 = false;
|
|
#endif
|
|
if (((V_tcp_pmtud_blackhole_detect == 1) ||
|
|
(V_tcp_pmtud_blackhole_detect == 2 && !isipv6) ||
|
|
(V_tcp_pmtud_blackhole_detect == 3 && isipv6)) &&
|
|
((tp->t_state == TCPS_ESTABLISHED) ||
|
|
(tp->t_state == TCPS_FIN_WAIT_1))) {
|
|
if (tp->t_rxtshift == 1) {
|
|
/*
|
|
* We enter blackhole detection after the first
|
|
* unsuccessful timer based retransmission.
|
|
* Then we reduce up to two times the MSS, each
|
|
* candidate giving two tries of retransmissions.
|
|
* But we give a candidate only two tries, if it
|
|
* actually reduces the MSS.
|
|
*/
|
|
tp->t_blackhole_enter = 2;
|
|
tp->t_blackhole_exit = tp->t_blackhole_enter;
|
|
if (isipv6) {
|
|
#ifdef INET6
|
|
if (tp->t_maxseg > V_tcp_v6pmtud_blackhole_mss)
|
|
tp->t_blackhole_exit += 2;
|
|
if (tp->t_maxseg > V_tcp_v6mssdflt &&
|
|
V_tcp_v6pmtud_blackhole_mss > V_tcp_v6mssdflt)
|
|
tp->t_blackhole_exit += 2;
|
|
#endif
|
|
} else {
|
|
#ifdef INET
|
|
if (tp->t_maxseg > V_tcp_pmtud_blackhole_mss)
|
|
tp->t_blackhole_exit += 2;
|
|
if (tp->t_maxseg > V_tcp_mssdflt &&
|
|
V_tcp_pmtud_blackhole_mss > V_tcp_mssdflt)
|
|
tp->t_blackhole_exit += 2;
|
|
#endif
|
|
}
|
|
}
|
|
if (((tp->t_flags2 & (TF2_PLPMTU_PMTUD|TF2_PLPMTU_MAXSEGSNT)) ==
|
|
(TF2_PLPMTU_PMTUD|TF2_PLPMTU_MAXSEGSNT)) &&
|
|
(tp->t_rxtshift >= tp->t_blackhole_enter &&
|
|
tp->t_rxtshift < tp->t_blackhole_exit &&
|
|
(tp->t_rxtshift - tp->t_blackhole_enter) % 2 == 0)) {
|
|
/*
|
|
* Enter Path MTU Black-hole Detection mechanism:
|
|
* - Disable Path MTU Discovery (IP "DF" bit).
|
|
* - Reduce MTU to lower value than what we
|
|
* negotiated with peer.
|
|
*/
|
|
if ((tp->t_flags2 & TF2_PLPMTU_BLACKHOLE) == 0) {
|
|
/* Record that we may have found a black hole. */
|
|
tp->t_flags2 |= TF2_PLPMTU_BLACKHOLE;
|
|
/* Keep track of previous MSS. */
|
|
tp->t_pmtud_saved_maxseg = tp->t_maxseg;
|
|
}
|
|
|
|
/*
|
|
* Reduce the MSS to blackhole value or to the default
|
|
* in an attempt to retransmit.
|
|
*/
|
|
#ifdef INET6
|
|
if (isipv6 &&
|
|
tp->t_maxseg > V_tcp_v6pmtud_blackhole_mss &&
|
|
V_tcp_v6pmtud_blackhole_mss > V_tcp_v6mssdflt) {
|
|
/* Use the sysctl tuneable blackhole MSS. */
|
|
tp->t_maxseg = V_tcp_v6pmtud_blackhole_mss;
|
|
TCPSTAT_INC(tcps_pmtud_blackhole_activated);
|
|
} else if (isipv6) {
|
|
/* Use the default MSS. */
|
|
tp->t_maxseg = V_tcp_v6mssdflt;
|
|
/*
|
|
* Disable Path MTU Discovery when we switch to
|
|
* minmss.
|
|
*/
|
|
tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
|
|
TCPSTAT_INC(tcps_pmtud_blackhole_activated_min_mss);
|
|
}
|
|
#endif
|
|
#if defined(INET6) && defined(INET)
|
|
else
|
|
#endif
|
|
#ifdef INET
|
|
if (tp->t_maxseg > V_tcp_pmtud_blackhole_mss &&
|
|
V_tcp_pmtud_blackhole_mss > V_tcp_mssdflt) {
|
|
/* Use the sysctl tuneable blackhole MSS. */
|
|
tp->t_maxseg = V_tcp_pmtud_blackhole_mss;
|
|
TCPSTAT_INC(tcps_pmtud_blackhole_activated);
|
|
} else {
|
|
/* Use the default MSS. */
|
|
tp->t_maxseg = V_tcp_mssdflt;
|
|
/*
|
|
* Disable Path MTU Discovery when we switch to
|
|
* minmss.
|
|
*/
|
|
tp->t_flags2 &= ~TF2_PLPMTU_PMTUD;
|
|
TCPSTAT_INC(tcps_pmtud_blackhole_activated_min_mss);
|
|
}
|
|
#endif
|
|
/*
|
|
* Reset the slow-start flight size
|
|
* as it may depend on the new MSS.
|
|
*/
|
|
if (CC_ALGO(tp)->conn_init != NULL)
|
|
CC_ALGO(tp)->conn_init(tp->ccv);
|
|
} else {
|
|
/*
|
|
* If further retransmissions are still unsuccessful
|
|
* with a lowered MTU, maybe this isn't a blackhole and
|
|
* we restore the previous MSS and blackhole detection
|
|
* flags.
|
|
*/
|
|
if ((tp->t_flags2 & TF2_PLPMTU_BLACKHOLE) &&
|
|
(tp->t_rxtshift >= tp->t_blackhole_exit)) {
|
|
tp->t_flags2 |= TF2_PLPMTU_PMTUD;
|
|
tp->t_flags2 &= ~TF2_PLPMTU_BLACKHOLE;
|
|
tp->t_maxseg = tp->t_pmtud_saved_maxseg;
|
|
TCPSTAT_INC(tcps_pmtud_blackhole_failed);
|
|
/*
|
|
* Reset the slow-start flight size as it
|
|
* may depend on the new MSS.
|
|
*/
|
|
if (CC_ALGO(tp)->conn_init != NULL)
|
|
CC_ALGO(tp)->conn_init(tp->ccv);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Disable RFC1323 and SACK if we haven't got any response to
|
|
* our third SYN to work-around some broken terminal servers
|
|
* (most of which have hopefully been retired) that have bad VJ
|
|
* header compression code which trashes TCP segments containing
|
|
* unknown-to-them TCP options.
|
|
*/
|
|
if (tcp_rexmit_drop_options && (tp->t_state == TCPS_SYN_SENT) &&
|
|
(tp->t_rxtshift == 3))
|
|
tp->t_flags &= ~(TF_REQ_SCALE|TF_REQ_TSTMP|TF_SACK_PERMIT);
|
|
/*
|
|
* If we backed off this far, notify the L3 protocol that we're having
|
|
* connection problems.
|
|
*/
|
|
if (tp->t_rxtshift > TCP_RTT_INVALIDATE) {
|
|
#ifdef INET6
|
|
if ((tp->t_inpcb->inp_vflag & INP_IPV6) != 0)
|
|
in6_losing(tp->t_inpcb);
|
|
else
|
|
#endif
|
|
in_losing(tp->t_inpcb);
|
|
}
|
|
tp->snd_nxt = tp->snd_una;
|
|
tp->snd_recover = tp->snd_max;
|
|
/*
|
|
* Force a segment to be sent.
|
|
*/
|
|
tp->t_flags |= TF_ACKNOW;
|
|
/*
|
|
* If timing a segment in this window, stop the timer.
|
|
*/
|
|
tp->t_rtttime = 0;
|
|
|
|
cc_cong_signal(tp, NULL, CC_RTO);
|
|
NET_EPOCH_ENTER(et);
|
|
(void) tp->t_fb->tfb_tcp_output(tp);
|
|
NET_EPOCH_EXIT(et);
|
|
#ifdef TCPDEBUG
|
|
if (tp != NULL && (tp->t_inpcb->inp_socket->so_options & SO_DEBUG))
|
|
tcp_trace(TA_USER, ostate, tp, (void *)0, (struct tcphdr *)0,
|
|
PRU_SLOWTIMO);
|
|
#endif
|
|
TCP_PROBE2(debug__user, tp, PRU_SLOWTIMO);
|
|
INP_WUNLOCK(inp);
|
|
out:
|
|
CURVNET_RESTORE();
|
|
}
|
|
|
|
void
|
|
tcp_timer_activate(struct tcpcb *tp, uint32_t timer_type, u_int delta)
|
|
{
|
|
struct callout *t_callout;
|
|
callout_func_t *f_callout;
|
|
struct inpcb *inp = tp->t_inpcb;
|
|
int cpu = inp_to_cpuid(inp);
|
|
|
|
#ifdef TCP_OFFLOAD
|
|
if (tp->t_flags & TF_TOE)
|
|
return;
|
|
#endif
|
|
|
|
if (tp->t_timers->tt_flags & TT_STOPPED)
|
|
return;
|
|
|
|
switch (timer_type) {
|
|
case TT_DELACK:
|
|
t_callout = &tp->t_timers->tt_delack;
|
|
f_callout = tcp_timer_delack;
|
|
break;
|
|
case TT_REXMT:
|
|
t_callout = &tp->t_timers->tt_rexmt;
|
|
f_callout = tcp_timer_rexmt;
|
|
break;
|
|
case TT_PERSIST:
|
|
t_callout = &tp->t_timers->tt_persist;
|
|
f_callout = tcp_timer_persist;
|
|
break;
|
|
case TT_KEEP:
|
|
t_callout = &tp->t_timers->tt_keep;
|
|
f_callout = tcp_timer_keep;
|
|
break;
|
|
case TT_2MSL:
|
|
t_callout = &tp->t_timers->tt_2msl;
|
|
f_callout = tcp_timer_2msl;
|
|
break;
|
|
default:
|
|
if (tp->t_fb->tfb_tcp_timer_activate) {
|
|
tp->t_fb->tfb_tcp_timer_activate(tp, timer_type, delta);
|
|
return;
|
|
}
|
|
panic("tp %p bad timer_type %#x", tp, timer_type);
|
|
}
|
|
if (delta == 0) {
|
|
callout_stop(t_callout);
|
|
} else {
|
|
callout_reset_on(t_callout, delta, f_callout, tp, cpu);
|
|
}
|
|
}
|
|
|
|
int
|
|
tcp_timer_active(struct tcpcb *tp, uint32_t timer_type)
|
|
{
|
|
struct callout *t_callout;
|
|
|
|
switch (timer_type) {
|
|
case TT_DELACK:
|
|
t_callout = &tp->t_timers->tt_delack;
|
|
break;
|
|
case TT_REXMT:
|
|
t_callout = &tp->t_timers->tt_rexmt;
|
|
break;
|
|
case TT_PERSIST:
|
|
t_callout = &tp->t_timers->tt_persist;
|
|
break;
|
|
case TT_KEEP:
|
|
t_callout = &tp->t_timers->tt_keep;
|
|
break;
|
|
case TT_2MSL:
|
|
t_callout = &tp->t_timers->tt_2msl;
|
|
break;
|
|
default:
|
|
if (tp->t_fb->tfb_tcp_timer_active) {
|
|
return(tp->t_fb->tfb_tcp_timer_active(tp, timer_type));
|
|
}
|
|
panic("tp %p bad timer_type %#x", tp, timer_type);
|
|
}
|
|
return callout_active(t_callout);
|
|
}
|
|
|
|
/*
|
|
* Stop the timer from running, and apply a flag
|
|
* against the timer_flags that will force the
|
|
* timer never to run. The flag is needed to assure
|
|
* a race does not leave it running and cause
|
|
* the timer to possibly restart itself (keep and persist
|
|
* especially do this).
|
|
*/
|
|
int
|
|
tcp_timer_suspend(struct tcpcb *tp, uint32_t timer_type)
|
|
{
|
|
struct callout *t_callout;
|
|
uint32_t t_flags;
|
|
|
|
switch (timer_type) {
|
|
case TT_DELACK:
|
|
t_flags = TT_DELACK_SUS;
|
|
t_callout = &tp->t_timers->tt_delack;
|
|
break;
|
|
case TT_REXMT:
|
|
t_flags = TT_REXMT_SUS;
|
|
t_callout = &tp->t_timers->tt_rexmt;
|
|
break;
|
|
case TT_PERSIST:
|
|
t_flags = TT_PERSIST_SUS;
|
|
t_callout = &tp->t_timers->tt_persist;
|
|
break;
|
|
case TT_KEEP:
|
|
t_flags = TT_KEEP_SUS;
|
|
t_callout = &tp->t_timers->tt_keep;
|
|
break;
|
|
case TT_2MSL:
|
|
t_flags = TT_2MSL_SUS;
|
|
t_callout = &tp->t_timers->tt_2msl;
|
|
break;
|
|
default:
|
|
panic("tp:%p bad timer_type 0x%x", tp, timer_type);
|
|
}
|
|
tp->t_timers->tt_flags |= t_flags;
|
|
return (callout_stop(t_callout));
|
|
}
|
|
|
|
void
|
|
tcp_timers_unsuspend(struct tcpcb *tp, uint32_t timer_type)
|
|
{
|
|
switch (timer_type) {
|
|
case TT_DELACK:
|
|
if (tp->t_timers->tt_flags & TT_DELACK_SUS) {
|
|
tp->t_timers->tt_flags &= ~TT_DELACK_SUS;
|
|
if (tp->t_flags & TF_DELACK) {
|
|
/* Delayed ack timer should be up activate a timer */
|
|
tp->t_flags &= ~TF_DELACK;
|
|
tcp_timer_activate(tp, TT_DELACK,
|
|
tcp_delacktime);
|
|
}
|
|
}
|
|
break;
|
|
case TT_REXMT:
|
|
if (tp->t_timers->tt_flags & TT_REXMT_SUS) {
|
|
tp->t_timers->tt_flags &= ~TT_REXMT_SUS;
|
|
if (SEQ_GT(tp->snd_max, tp->snd_una) &&
|
|
(tcp_timer_active((tp), TT_PERSIST) == 0) &&
|
|
tp->snd_wnd) {
|
|
/* We have outstanding data activate a timer */
|
|
tcp_timer_activate(tp, TT_REXMT,
|
|
tp->t_rxtcur);
|
|
}
|
|
}
|
|
break;
|
|
case TT_PERSIST:
|
|
if (tp->t_timers->tt_flags & TT_PERSIST_SUS) {
|
|
tp->t_timers->tt_flags &= ~TT_PERSIST_SUS;
|
|
if (tp->snd_wnd == 0) {
|
|
/* Activate the persists timer */
|
|
tp->t_rxtshift = 0;
|
|
tcp_setpersist(tp);
|
|
}
|
|
}
|
|
break;
|
|
case TT_KEEP:
|
|
if (tp->t_timers->tt_flags & TT_KEEP_SUS) {
|
|
tp->t_timers->tt_flags &= ~TT_KEEP_SUS;
|
|
tcp_timer_activate(tp, TT_KEEP,
|
|
TCPS_HAVEESTABLISHED(tp->t_state) ?
|
|
TP_KEEPIDLE(tp) : TP_KEEPINIT(tp));
|
|
}
|
|
break;
|
|
case TT_2MSL:
|
|
if (tp->t_timers->tt_flags &= TT_2MSL_SUS) {
|
|
tp->t_timers->tt_flags &= ~TT_2MSL_SUS;
|
|
if ((tp->t_state == TCPS_FIN_WAIT_2) &&
|
|
((tp->t_inpcb->inp_socket == NULL) ||
|
|
(tp->t_inpcb->inp_socket->so_rcv.sb_state & SBS_CANTRCVMORE))) {
|
|
/* Star the 2MSL timer */
|
|
tcp_timer_activate(tp, TT_2MSL,
|
|
(tcp_fast_finwait2_recycle) ?
|
|
tcp_finwait2_timeout : TP_MAXIDLE(tp));
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
panic("tp:%p bad timer_type 0x%x", tp, timer_type);
|
|
}
|
|
}
|
|
|
|
static void
|
|
tcp_timer_discard(void *ptp)
|
|
{
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
struct epoch_tracker et;
|
|
|
|
tp = (struct tcpcb *)ptp;
|
|
CURVNET_SET(tp->t_vnet);
|
|
NET_EPOCH_ENTER(et);
|
|
inp = tp->t_inpcb;
|
|
KASSERT(inp != NULL, ("%s: tp %p tp->t_inpcb == NULL",
|
|
__func__, tp));
|
|
INP_WLOCK(inp);
|
|
KASSERT((tp->t_timers->tt_flags & TT_STOPPED) != 0,
|
|
("%s: tcpcb has to be stopped here", __func__));
|
|
if (--tp->t_timers->tt_draincnt > 0 ||
|
|
tcp_freecb(tp) == false)
|
|
INP_WUNLOCK(inp);
|
|
NET_EPOCH_EXIT(et);
|
|
CURVNET_RESTORE();
|
|
}
|
|
|
|
void
|
|
tcp_timer_stop(struct tcpcb *tp, uint32_t timer_type)
|
|
{
|
|
struct callout *t_callout;
|
|
|
|
tp->t_timers->tt_flags |= TT_STOPPED;
|
|
switch (timer_type) {
|
|
case TT_DELACK:
|
|
t_callout = &tp->t_timers->tt_delack;
|
|
break;
|
|
case TT_REXMT:
|
|
t_callout = &tp->t_timers->tt_rexmt;
|
|
break;
|
|
case TT_PERSIST:
|
|
t_callout = &tp->t_timers->tt_persist;
|
|
break;
|
|
case TT_KEEP:
|
|
t_callout = &tp->t_timers->tt_keep;
|
|
break;
|
|
case TT_2MSL:
|
|
t_callout = &tp->t_timers->tt_2msl;
|
|
break;
|
|
default:
|
|
if (tp->t_fb->tfb_tcp_timer_stop) {
|
|
/*
|
|
* XXXrrs we need to look at this with the
|
|
* stop case below (flags).
|
|
*/
|
|
tp->t_fb->tfb_tcp_timer_stop(tp, timer_type);
|
|
return;
|
|
}
|
|
panic("tp %p bad timer_type %#x", tp, timer_type);
|
|
}
|
|
|
|
if (callout_async_drain(t_callout, tcp_timer_discard) == 0) {
|
|
/*
|
|
* Can't stop the callout, defer tcpcb actual deletion
|
|
* to the last one. We do this using the async drain
|
|
* function and incrementing the count in
|
|
*/
|
|
tp->t_timers->tt_draincnt++;
|
|
}
|
|
}
|