fd389e7cd5
when the option is enabled (not sure how LINT/build-universe missed this) opps. Sponsored by: Netflix Inc
3220 lines
84 KiB
C
3220 lines
84 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_subr.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_ipsec.h"
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#include "opt_tcpdebug.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/callout.h>
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#include <sys/eventhandler.h>
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#ifdef TCP_HHOOK
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#include <sys/hhook.h>
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#endif
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#include <sys/kernel.h>
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#ifdef TCP_HHOOK
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#include <sys/khelp.h>
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#endif
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#include <sys/sysctl.h>
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#include <sys/jail.h>
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#include <sys/malloc.h>
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#include <sys/refcount.h>
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#include <sys/mbuf.h>
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#ifdef INET6
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#include <sys/domain.h>
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#endif
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/sdt.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/protosw.h>
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#include <sys/random.h>
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#include <vm/uma.h>
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#include <net/route.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/vnet.h>
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#include <netinet/in.h>
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#include <netinet/in_fib.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_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/ip_var.h>
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#ifdef INET6
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#include <netinet/icmp6.h>
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#include <netinet/ip6.h>
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#include <netinet6/in6_fib.h>
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#include <netinet6/in6_pcb.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/scope6_var.h>
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#include <netinet6/nd6.h>
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#endif
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#include <netinet/tcp.h>
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#include <netinet/tcp_fsm.h>
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#include <netinet/tcp_seq.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_log_buf.h>
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#include <netinet/tcp_syncache.h>
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#include <netinet/tcp_hpts.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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#include <netinet/tcp_fastopen.h>
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#ifdef TCPPCAP
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#include <netinet/tcp_pcap.h>
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#endif
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#ifdef TCPDEBUG
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#include <netinet/tcp_debug.h>
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#endif
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#ifdef INET6
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#include <netinet6/ip6protosw.h>
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#endif
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#ifdef TCP_OFFLOAD
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#include <netinet/tcp_offload.h>
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#endif
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#include <netipsec/ipsec_support.h>
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#include <machine/in_cksum.h>
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#include <sys/md5.h>
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#include <security/mac/mac_framework.h>
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VNET_DEFINE(int, tcp_mssdflt) = TCP_MSS;
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#ifdef INET6
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VNET_DEFINE(int, tcp_v6mssdflt) = TCP6_MSS;
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#endif
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struct rwlock tcp_function_lock;
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static int
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sysctl_net_inet_tcp_mss_check(SYSCTL_HANDLER_ARGS)
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{
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int error, new;
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new = V_tcp_mssdflt;
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error = sysctl_handle_int(oidp, &new, 0, req);
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if (error == 0 && req->newptr) {
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if (new < TCP_MINMSS)
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error = EINVAL;
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else
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V_tcp_mssdflt = new;
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}
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return (error);
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}
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SYSCTL_PROC(_net_inet_tcp, TCPCTL_MSSDFLT, mssdflt,
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CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW, &VNET_NAME(tcp_mssdflt), 0,
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&sysctl_net_inet_tcp_mss_check, "I",
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"Default TCP Maximum Segment Size");
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#ifdef INET6
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static int
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sysctl_net_inet_tcp_mss_v6_check(SYSCTL_HANDLER_ARGS)
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{
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int error, new;
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new = V_tcp_v6mssdflt;
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error = sysctl_handle_int(oidp, &new, 0, req);
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if (error == 0 && req->newptr) {
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if (new < TCP_MINMSS)
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error = EINVAL;
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else
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V_tcp_v6mssdflt = new;
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}
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return (error);
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}
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SYSCTL_PROC(_net_inet_tcp, TCPCTL_V6MSSDFLT, v6mssdflt,
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CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW, &VNET_NAME(tcp_v6mssdflt), 0,
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&sysctl_net_inet_tcp_mss_v6_check, "I",
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"Default TCP Maximum Segment Size for IPv6");
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#endif /* INET6 */
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/*
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* Minimum MSS we accept and use. This prevents DoS attacks where
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* we are forced to a ridiculous low MSS like 20 and send hundreds
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* of packets instead of one. The effect scales with the available
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* bandwidth and quickly saturates the CPU and network interface
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* with packet generation and sending. Set to zero to disable MINMSS
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* checking. This setting prevents us from sending too small packets.
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*/
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VNET_DEFINE(int, tcp_minmss) = TCP_MINMSS;
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SYSCTL_INT(_net_inet_tcp, OID_AUTO, minmss, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(tcp_minmss), 0,
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"Minimum TCP Maximum Segment Size");
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VNET_DEFINE(int, tcp_do_rfc1323) = 1;
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SYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1323, rfc1323, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(tcp_do_rfc1323), 0,
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"Enable rfc1323 (high performance TCP) extensions");
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static int tcp_log_debug = 0;
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SYSCTL_INT(_net_inet_tcp, OID_AUTO, log_debug, CTLFLAG_RW,
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&tcp_log_debug, 0, "Log errors caused by incoming TCP segments");
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static int tcp_tcbhashsize;
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SYSCTL_INT(_net_inet_tcp, OID_AUTO, tcbhashsize, CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
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&tcp_tcbhashsize, 0, "Size of TCP control-block hashtable");
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static int do_tcpdrain = 1;
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SYSCTL_INT(_net_inet_tcp, OID_AUTO, do_tcpdrain, CTLFLAG_RW, &do_tcpdrain, 0,
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"Enable tcp_drain routine for extra help when low on mbufs");
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SYSCTL_UINT(_net_inet_tcp, OID_AUTO, pcbcount, CTLFLAG_VNET | CTLFLAG_RD,
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&VNET_NAME(tcbinfo.ipi_count), 0, "Number of active PCBs");
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static VNET_DEFINE(int, icmp_may_rst) = 1;
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#define V_icmp_may_rst VNET(icmp_may_rst)
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SYSCTL_INT(_net_inet_tcp, OID_AUTO, icmp_may_rst, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(icmp_may_rst), 0,
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"Certain ICMP unreachable messages may abort connections in SYN_SENT");
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static VNET_DEFINE(int, tcp_isn_reseed_interval) = 0;
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#define V_tcp_isn_reseed_interval VNET(tcp_isn_reseed_interval)
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SYSCTL_INT(_net_inet_tcp, OID_AUTO, isn_reseed_interval, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(tcp_isn_reseed_interval), 0,
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"Seconds between reseeding of ISN secret");
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static int tcp_soreceive_stream;
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SYSCTL_INT(_net_inet_tcp, OID_AUTO, soreceive_stream, CTLFLAG_RDTUN,
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&tcp_soreceive_stream, 0, "Using soreceive_stream for TCP sockets");
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VNET_DEFINE(uma_zone_t, sack_hole_zone);
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#define V_sack_hole_zone VNET(sack_hole_zone)
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#ifdef TCP_HHOOK
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VNET_DEFINE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST+1]);
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#endif
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static int tcp_default_fb_init(struct tcpcb *tp);
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static void tcp_default_fb_fini(struct tcpcb *tp, int tcb_is_purged);
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static int tcp_default_handoff_ok(struct tcpcb *tp);
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static struct inpcb *tcp_notify(struct inpcb *, int);
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static struct inpcb *tcp_mtudisc_notify(struct inpcb *, int);
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static void tcp_mtudisc(struct inpcb *, int);
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static char * tcp_log_addr(struct in_conninfo *inc, struct tcphdr *th,
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void *ip4hdr, const void *ip6hdr);
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static struct tcp_function_block tcp_def_funcblk = {
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.tfb_tcp_block_name = "freebsd",
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.tfb_tcp_output = tcp_output,
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.tfb_tcp_do_segment = tcp_do_segment,
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.tfb_tcp_ctloutput = tcp_default_ctloutput,
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.tfb_tcp_handoff_ok = tcp_default_handoff_ok,
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.tfb_tcp_fb_init = tcp_default_fb_init,
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.tfb_tcp_fb_fini = tcp_default_fb_fini,
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};
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int t_functions_inited = 0;
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static int tcp_fb_cnt = 0;
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struct tcp_funchead t_functions;
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static struct tcp_function_block *tcp_func_set_ptr = &tcp_def_funcblk;
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static void
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init_tcp_functions(void)
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{
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if (t_functions_inited == 0) {
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TAILQ_INIT(&t_functions);
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rw_init_flags(&tcp_function_lock, "tcp_func_lock" , 0);
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t_functions_inited = 1;
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}
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}
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static struct tcp_function_block *
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find_tcp_functions_locked(struct tcp_function_set *fs)
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{
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struct tcp_function *f;
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struct tcp_function_block *blk=NULL;
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TAILQ_FOREACH(f, &t_functions, tf_next) {
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if (strcmp(f->tf_name, fs->function_set_name) == 0) {
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blk = f->tf_fb;
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break;
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}
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}
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return(blk);
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}
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static struct tcp_function_block *
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find_tcp_fb_locked(struct tcp_function_block *blk, struct tcp_function **s)
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{
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struct tcp_function_block *rblk=NULL;
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struct tcp_function *f;
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TAILQ_FOREACH(f, &t_functions, tf_next) {
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if (f->tf_fb == blk) {
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rblk = blk;
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if (s) {
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*s = f;
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}
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break;
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}
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}
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return (rblk);
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}
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struct tcp_function_block *
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find_and_ref_tcp_functions(struct tcp_function_set *fs)
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{
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struct tcp_function_block *blk;
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rw_rlock(&tcp_function_lock);
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blk = find_tcp_functions_locked(fs);
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if (blk)
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refcount_acquire(&blk->tfb_refcnt);
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rw_runlock(&tcp_function_lock);
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return(blk);
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}
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struct tcp_function_block *
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find_and_ref_tcp_fb(struct tcp_function_block *blk)
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{
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struct tcp_function_block *rblk;
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rw_rlock(&tcp_function_lock);
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rblk = find_tcp_fb_locked(blk, NULL);
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if (rblk)
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refcount_acquire(&rblk->tfb_refcnt);
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rw_runlock(&tcp_function_lock);
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return(rblk);
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}
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static struct tcp_function_block *
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find_and_ref_tcp_default_fb(void)
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{
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struct tcp_function_block *rblk;
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rw_rlock(&tcp_function_lock);
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rblk = tcp_func_set_ptr;
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refcount_acquire(&rblk->tfb_refcnt);
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rw_runlock(&tcp_function_lock);
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return (rblk);
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}
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void
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tcp_switch_back_to_default(struct tcpcb *tp)
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{
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struct tcp_function_block *tfb;
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KASSERT(tp->t_fb != &tcp_def_funcblk,
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("%s: called by the built-in default stack", __func__));
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/*
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* Release the old stack. This function will either find a new one
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* or panic.
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*/
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if (tp->t_fb->tfb_tcp_fb_fini != NULL)
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(*tp->t_fb->tfb_tcp_fb_fini)(tp, 0);
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refcount_release(&tp->t_fb->tfb_refcnt);
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/*
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* Now, we'll find a new function block to use.
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* Start by trying the current user-selected
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* default, unless this stack is the user-selected
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* default.
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*/
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tfb = find_and_ref_tcp_default_fb();
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if (tfb == tp->t_fb) {
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refcount_release(&tfb->tfb_refcnt);
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tfb = NULL;
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}
|
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/* Does the stack accept this connection? */
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if (tfb != NULL && tfb->tfb_tcp_handoff_ok != NULL &&
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(*tfb->tfb_tcp_handoff_ok)(tp)) {
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refcount_release(&tfb->tfb_refcnt);
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tfb = NULL;
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}
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/* Try to use that stack. */
|
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if (tfb != NULL) {
|
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/* Initialize the new stack. If it succeeds, we are done. */
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tp->t_fb = tfb;
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if (tp->t_fb->tfb_tcp_fb_init == NULL ||
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(*tp->t_fb->tfb_tcp_fb_init)(tp) == 0)
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return;
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|
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/*
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* Initialization failed. Release the reference count on
|
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* the stack.
|
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*/
|
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refcount_release(&tfb->tfb_refcnt);
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}
|
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|
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/*
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* If that wasn't feasible, use the built-in default
|
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* stack which is not allowed to reject anyone.
|
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*/
|
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tfb = find_and_ref_tcp_fb(&tcp_def_funcblk);
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if (tfb == NULL) {
|
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/* there always should be a default */
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panic("Can't refer to tcp_def_funcblk");
|
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}
|
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if (tfb->tfb_tcp_handoff_ok != NULL) {
|
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if ((*tfb->tfb_tcp_handoff_ok) (tp)) {
|
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/* The default stack cannot say no */
|
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panic("Default stack rejects a new session?");
|
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}
|
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}
|
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tp->t_fb = tfb;
|
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if (tp->t_fb->tfb_tcp_fb_init != NULL &&
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(*tp->t_fb->tfb_tcp_fb_init)(tp)) {
|
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/* The default stack cannot fail */
|
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panic("Default stack initialization failed");
|
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}
|
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}
|
|
|
|
static int
|
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sysctl_net_inet_default_tcp_functions(SYSCTL_HANDLER_ARGS)
|
|
{
|
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int error=ENOENT;
|
|
struct tcp_function_set fs;
|
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struct tcp_function_block *blk;
|
|
|
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memset(&fs, 0, sizeof(fs));
|
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rw_rlock(&tcp_function_lock);
|
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blk = find_tcp_fb_locked(tcp_func_set_ptr, NULL);
|
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if (blk) {
|
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/* Found him */
|
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strcpy(fs.function_set_name, blk->tfb_tcp_block_name);
|
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fs.pcbcnt = blk->tfb_refcnt;
|
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}
|
|
rw_runlock(&tcp_function_lock);
|
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error = sysctl_handle_string(oidp, fs.function_set_name,
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sizeof(fs.function_set_name), req);
|
|
|
|
/* Check for error or no change */
|
|
if (error != 0 || req->newptr == NULL)
|
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return(error);
|
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|
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rw_wlock(&tcp_function_lock);
|
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blk = find_tcp_functions_locked(&fs);
|
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if ((blk == NULL) ||
|
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(blk->tfb_flags & TCP_FUNC_BEING_REMOVED)) {
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error = ENOENT;
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goto done;
|
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}
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tcp_func_set_ptr = blk;
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done:
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rw_wunlock(&tcp_function_lock);
|
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return (error);
|
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}
|
|
|
|
SYSCTL_PROC(_net_inet_tcp, OID_AUTO, functions_default,
|
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CTLTYPE_STRING | CTLFLAG_RW,
|
|
NULL, 0, sysctl_net_inet_default_tcp_functions, "A",
|
|
"Set/get the default TCP functions");
|
|
|
|
static int
|
|
sysctl_net_inet_list_available(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error, cnt, linesz;
|
|
struct tcp_function *f;
|
|
char *buffer, *cp;
|
|
size_t bufsz, outsz;
|
|
bool alias;
|
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|
|
cnt = 0;
|
|
rw_rlock(&tcp_function_lock);
|
|
TAILQ_FOREACH(f, &t_functions, tf_next) {
|
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cnt++;
|
|
}
|
|
rw_runlock(&tcp_function_lock);
|
|
|
|
bufsz = (cnt+2) * ((TCP_FUNCTION_NAME_LEN_MAX * 2) + 13) + 1;
|
|
buffer = malloc(bufsz, M_TEMP, M_WAITOK);
|
|
|
|
error = 0;
|
|
cp = buffer;
|
|
|
|
linesz = snprintf(cp, bufsz, "\n%-32s%c %-32s %s\n", "Stack", 'D',
|
|
"Alias", "PCB count");
|
|
cp += linesz;
|
|
bufsz -= linesz;
|
|
outsz = linesz;
|
|
|
|
rw_rlock(&tcp_function_lock);
|
|
TAILQ_FOREACH(f, &t_functions, tf_next) {
|
|
alias = (f->tf_name != f->tf_fb->tfb_tcp_block_name);
|
|
linesz = snprintf(cp, bufsz, "%-32s%c %-32s %u\n",
|
|
f->tf_fb->tfb_tcp_block_name,
|
|
(f->tf_fb == tcp_func_set_ptr) ? '*' : ' ',
|
|
alias ? f->tf_name : "-",
|
|
f->tf_fb->tfb_refcnt);
|
|
if (linesz >= bufsz) {
|
|
error = EOVERFLOW;
|
|
break;
|
|
}
|
|
cp += linesz;
|
|
bufsz -= linesz;
|
|
outsz += linesz;
|
|
}
|
|
rw_runlock(&tcp_function_lock);
|
|
if (error == 0)
|
|
error = sysctl_handle_string(oidp, buffer, outsz + 1, req);
|
|
free(buffer, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_net_inet_tcp, OID_AUTO, functions_available,
|
|
CTLTYPE_STRING|CTLFLAG_RD,
|
|
NULL, 0, sysctl_net_inet_list_available, "A",
|
|
"list available TCP Function sets");
|
|
|
|
/*
|
|
* Exports one (struct tcp_function_info) for each alias/name.
|
|
*/
|
|
static int
|
|
sysctl_net_inet_list_func_info(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int cnt, error;
|
|
struct tcp_function *f;
|
|
struct tcp_function_info tfi;
|
|
|
|
/*
|
|
* We don't allow writes.
|
|
*/
|
|
if (req->newptr != NULL)
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* Wire the old buffer so we can directly copy the functions to
|
|
* user space without dropping the lock.
|
|
*/
|
|
if (req->oldptr != NULL) {
|
|
error = sysctl_wire_old_buffer(req, 0);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Walk the list and copy out matching entries. If INVARIANTS
|
|
* is compiled in, also walk the list to verify the length of
|
|
* the list matches what we have recorded.
|
|
*/
|
|
rw_rlock(&tcp_function_lock);
|
|
#ifdef INVARIANTS
|
|
cnt = 0;
|
|
#else
|
|
if (req->oldptr == NULL) {
|
|
cnt = tcp_fb_cnt;
|
|
goto skip_loop;
|
|
}
|
|
#endif
|
|
TAILQ_FOREACH(f, &t_functions, tf_next) {
|
|
#ifdef INVARIANTS
|
|
cnt++;
|
|
#endif
|
|
if (req->oldptr != NULL) {
|
|
tfi.tfi_refcnt = f->tf_fb->tfb_refcnt;
|
|
tfi.tfi_id = f->tf_fb->tfb_id;
|
|
(void)strncpy(tfi.tfi_alias, f->tf_name,
|
|
TCP_FUNCTION_NAME_LEN_MAX);
|
|
tfi.tfi_alias[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0';
|
|
(void)strncpy(tfi.tfi_name,
|
|
f->tf_fb->tfb_tcp_block_name,
|
|
TCP_FUNCTION_NAME_LEN_MAX);
|
|
tfi.tfi_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0';
|
|
error = SYSCTL_OUT(req, &tfi, sizeof(tfi));
|
|
/*
|
|
* Don't stop on error, as that is the
|
|
* mechanism we use to accumulate length
|
|
* information if the buffer was too short.
|
|
*/
|
|
}
|
|
}
|
|
KASSERT(cnt == tcp_fb_cnt,
|
|
("%s: cnt (%d) != tcp_fb_cnt (%d)", __func__, cnt, tcp_fb_cnt));
|
|
#ifndef INVARIANTS
|
|
skip_loop:
|
|
#endif
|
|
rw_runlock(&tcp_function_lock);
|
|
if (req->oldptr == NULL)
|
|
error = SYSCTL_OUT(req, NULL,
|
|
(cnt + 1) * sizeof(struct tcp_function_info));
|
|
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_net_inet_tcp, OID_AUTO, function_info,
|
|
CTLTYPE_OPAQUE | CTLFLAG_SKIP | CTLFLAG_RD | CTLFLAG_MPSAFE,
|
|
NULL, 0, sysctl_net_inet_list_func_info, "S,tcp_function_info",
|
|
"List TCP function block name-to-ID mappings");
|
|
|
|
/*
|
|
* tfb_tcp_handoff_ok() function for the default stack.
|
|
* Note that we'll basically try to take all comers.
|
|
*/
|
|
static int
|
|
tcp_default_handoff_ok(struct tcpcb *tp)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* tfb_tcp_fb_init() function for the default stack.
|
|
*
|
|
* This handles making sure we have appropriate timers set if you are
|
|
* transitioning a socket that has some amount of setup done.
|
|
*
|
|
* The init() fuction from the default can *never* return non-zero i.e.
|
|
* it is required to always succeed since it is the stack of last resort!
|
|
*/
|
|
static int
|
|
tcp_default_fb_init(struct tcpcb *tp)
|
|
{
|
|
|
|
struct socket *so;
|
|
|
|
INP_WLOCK_ASSERT(tp->t_inpcb);
|
|
|
|
KASSERT(tp->t_state >= 0 && tp->t_state < TCPS_TIME_WAIT,
|
|
("%s: connection %p in unexpected state %d", __func__, tp,
|
|
tp->t_state));
|
|
|
|
/*
|
|
* Nothing to do for ESTABLISHED or LISTEN states. And, we don't
|
|
* know what to do for unexpected states (which includes TIME_WAIT).
|
|
*/
|
|
if (tp->t_state <= TCPS_LISTEN || tp->t_state >= TCPS_TIME_WAIT)
|
|
return (0);
|
|
|
|
/*
|
|
* Make sure some kind of transmission timer is set if there is
|
|
* outstanding data.
|
|
*/
|
|
so = tp->t_inpcb->inp_socket;
|
|
if ((!TCPS_HAVEESTABLISHED(tp->t_state) || sbavail(&so->so_snd) ||
|
|
tp->snd_una != tp->snd_max) && !(tcp_timer_active(tp, TT_REXMT) ||
|
|
tcp_timer_active(tp, TT_PERSIST))) {
|
|
/*
|
|
* If the session has established and it looks like it should
|
|
* be in the persist state, set the persist timer. Otherwise,
|
|
* set the retransmit timer.
|
|
*/
|
|
if (TCPS_HAVEESTABLISHED(tp->t_state) && tp->snd_wnd == 0 &&
|
|
(int32_t)(tp->snd_nxt - tp->snd_una) <
|
|
(int32_t)sbavail(&so->so_snd))
|
|
tcp_setpersist(tp);
|
|
else
|
|
tcp_timer_activate(tp, TT_REXMT, tp->t_rxtcur);
|
|
}
|
|
|
|
/* All non-embryonic sessions get a keepalive timer. */
|
|
if (!tcp_timer_active(tp, TT_KEEP))
|
|
tcp_timer_activate(tp, TT_KEEP,
|
|
TCPS_HAVEESTABLISHED(tp->t_state) ? TP_KEEPIDLE(tp) :
|
|
TP_KEEPINIT(tp));
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* tfb_tcp_fb_fini() function for the default stack.
|
|
*
|
|
* This changes state as necessary (or prudent) to prepare for another stack
|
|
* to assume responsibility for the connection.
|
|
*/
|
|
static void
|
|
tcp_default_fb_fini(struct tcpcb *tp, int tcb_is_purged)
|
|
{
|
|
|
|
INP_WLOCK_ASSERT(tp->t_inpcb);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Target size of TCP PCB hash tables. Must be a power of two.
|
|
*
|
|
* Note that this can be overridden by the kernel environment
|
|
* variable net.inet.tcp.tcbhashsize
|
|
*/
|
|
#ifndef TCBHASHSIZE
|
|
#define TCBHASHSIZE 0
|
|
#endif
|
|
|
|
/*
|
|
* XXX
|
|
* Callouts should be moved into struct tcp directly. They are currently
|
|
* separate because the tcpcb structure is exported to userland for sysctl
|
|
* parsing purposes, which do not know about callouts.
|
|
*/
|
|
struct tcpcb_mem {
|
|
struct tcpcb tcb;
|
|
struct tcp_timer tt;
|
|
struct cc_var ccv;
|
|
#ifdef TCP_HHOOK
|
|
struct osd osd;
|
|
#endif
|
|
};
|
|
|
|
static VNET_DEFINE(uma_zone_t, tcpcb_zone);
|
|
#define V_tcpcb_zone VNET(tcpcb_zone)
|
|
|
|
MALLOC_DEFINE(M_TCPLOG, "tcplog", "TCP address and flags print buffers");
|
|
MALLOC_DEFINE(M_TCPFUNCTIONS, "tcpfunc", "TCP function set memory");
|
|
|
|
static struct mtx isn_mtx;
|
|
|
|
#define ISN_LOCK_INIT() mtx_init(&isn_mtx, "isn_mtx", NULL, MTX_DEF)
|
|
#define ISN_LOCK() mtx_lock(&isn_mtx)
|
|
#define ISN_UNLOCK() mtx_unlock(&isn_mtx)
|
|
|
|
/*
|
|
* TCP initialization.
|
|
*/
|
|
static void
|
|
tcp_zone_change(void *tag)
|
|
{
|
|
|
|
uma_zone_set_max(V_tcbinfo.ipi_zone, maxsockets);
|
|
uma_zone_set_max(V_tcpcb_zone, maxsockets);
|
|
tcp_tw_zone_change();
|
|
}
|
|
|
|
static int
|
|
tcp_inpcb_init(void *mem, int size, int flags)
|
|
{
|
|
struct inpcb *inp = mem;
|
|
|
|
INP_LOCK_INIT(inp, "inp", "tcpinp");
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Take a value and get the next power of 2 that doesn't overflow.
|
|
* Used to size the tcp_inpcb hash buckets.
|
|
*/
|
|
static int
|
|
maketcp_hashsize(int size)
|
|
{
|
|
int hashsize;
|
|
|
|
/*
|
|
* auto tune.
|
|
* get the next power of 2 higher than maxsockets.
|
|
*/
|
|
hashsize = 1 << fls(size);
|
|
/* catch overflow, and just go one power of 2 smaller */
|
|
if (hashsize < size) {
|
|
hashsize = 1 << (fls(size) - 1);
|
|
}
|
|
return (hashsize);
|
|
}
|
|
|
|
static volatile int next_tcp_stack_id = 1;
|
|
|
|
/*
|
|
* Register a TCP function block with the name provided in the names
|
|
* array. (Note that this function does NOT automatically register
|
|
* blk->tfb_tcp_block_name as a stack name. Therefore, you should
|
|
* explicitly include blk->tfb_tcp_block_name in the list of names if
|
|
* you wish to register the stack with that name.)
|
|
*
|
|
* Either all name registrations will succeed or all will fail. If
|
|
* a name registration fails, the function will update the num_names
|
|
* argument to point to the array index of the name that encountered
|
|
* the failure.
|
|
*
|
|
* Returns 0 on success, or an error code on failure.
|
|
*/
|
|
int
|
|
register_tcp_functions_as_names(struct tcp_function_block *blk, int wait,
|
|
const char *names[], int *num_names)
|
|
{
|
|
struct tcp_function *n;
|
|
struct tcp_function_set fs;
|
|
int error, i;
|
|
|
|
KASSERT(names != NULL && *num_names > 0,
|
|
("%s: Called with 0-length name list", __func__));
|
|
KASSERT(names != NULL, ("%s: Called with NULL name list", __func__));
|
|
|
|
if (t_functions_inited == 0) {
|
|
init_tcp_functions();
|
|
}
|
|
if ((blk->tfb_tcp_output == NULL) ||
|
|
(blk->tfb_tcp_do_segment == NULL) ||
|
|
(blk->tfb_tcp_ctloutput == NULL) ||
|
|
(strlen(blk->tfb_tcp_block_name) == 0)) {
|
|
/*
|
|
* These functions are required and you
|
|
* need a name.
|
|
*/
|
|
*num_names = 0;
|
|
return (EINVAL);
|
|
}
|
|
if (blk->tfb_tcp_timer_stop_all ||
|
|
blk->tfb_tcp_timer_activate ||
|
|
blk->tfb_tcp_timer_active ||
|
|
blk->tfb_tcp_timer_stop) {
|
|
/*
|
|
* If you define one timer function you
|
|
* must have them all.
|
|
*/
|
|
if ((blk->tfb_tcp_timer_stop_all == NULL) ||
|
|
(blk->tfb_tcp_timer_activate == NULL) ||
|
|
(blk->tfb_tcp_timer_active == NULL) ||
|
|
(blk->tfb_tcp_timer_stop == NULL)) {
|
|
*num_names = 0;
|
|
return (EINVAL);
|
|
}
|
|
}
|
|
|
|
refcount_init(&blk->tfb_refcnt, 0);
|
|
blk->tfb_flags = 0;
|
|
blk->tfb_id = atomic_fetchadd_int(&next_tcp_stack_id, 1);
|
|
for (i = 0; i < *num_names; i++) {
|
|
n = malloc(sizeof(struct tcp_function), M_TCPFUNCTIONS, wait);
|
|
if (n == NULL) {
|
|
error = ENOMEM;
|
|
goto cleanup;
|
|
}
|
|
n->tf_fb = blk;
|
|
|
|
(void)strncpy(fs.function_set_name, names[i],
|
|
TCP_FUNCTION_NAME_LEN_MAX);
|
|
fs.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0';
|
|
rw_wlock(&tcp_function_lock);
|
|
if (find_tcp_functions_locked(&fs) != NULL) {
|
|
/* Duplicate name space not allowed */
|
|
rw_wunlock(&tcp_function_lock);
|
|
free(n, M_TCPFUNCTIONS);
|
|
error = EALREADY;
|
|
goto cleanup;
|
|
}
|
|
(void)strncpy(n->tf_name, names[i], TCP_FUNCTION_NAME_LEN_MAX);
|
|
n->tf_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0';
|
|
TAILQ_INSERT_TAIL(&t_functions, n, tf_next);
|
|
tcp_fb_cnt++;
|
|
rw_wunlock(&tcp_function_lock);
|
|
}
|
|
return(0);
|
|
|
|
cleanup:
|
|
/*
|
|
* Deregister the names we just added. Because registration failed
|
|
* for names[i], we don't need to deregister that name.
|
|
*/
|
|
*num_names = i;
|
|
rw_wlock(&tcp_function_lock);
|
|
while (--i >= 0) {
|
|
TAILQ_FOREACH(n, &t_functions, tf_next) {
|
|
if (!strncmp(n->tf_name, names[i],
|
|
TCP_FUNCTION_NAME_LEN_MAX)) {
|
|
TAILQ_REMOVE(&t_functions, n, tf_next);
|
|
tcp_fb_cnt--;
|
|
n->tf_fb = NULL;
|
|
free(n, M_TCPFUNCTIONS);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
rw_wunlock(&tcp_function_lock);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Register a TCP function block using the name provided in the name
|
|
* argument.
|
|
*
|
|
* Returns 0 on success, or an error code on failure.
|
|
*/
|
|
int
|
|
register_tcp_functions_as_name(struct tcp_function_block *blk, const char *name,
|
|
int wait)
|
|
{
|
|
const char *name_list[1];
|
|
int num_names, rv;
|
|
|
|
num_names = 1;
|
|
if (name != NULL)
|
|
name_list[0] = name;
|
|
else
|
|
name_list[0] = blk->tfb_tcp_block_name;
|
|
rv = register_tcp_functions_as_names(blk, wait, name_list, &num_names);
|
|
return (rv);
|
|
}
|
|
|
|
/*
|
|
* Register a TCP function block using the name defined in
|
|
* blk->tfb_tcp_block_name.
|
|
*
|
|
* Returns 0 on success, or an error code on failure.
|
|
*/
|
|
int
|
|
register_tcp_functions(struct tcp_function_block *blk, int wait)
|
|
{
|
|
|
|
return (register_tcp_functions_as_name(blk, NULL, wait));
|
|
}
|
|
|
|
/*
|
|
* Deregister all names associated with a function block. This
|
|
* functionally removes the function block from use within the system.
|
|
*
|
|
* When called with a true quiesce argument, mark the function block
|
|
* as being removed so no more stacks will use it and determine
|
|
* whether the removal would succeed.
|
|
*
|
|
* When called with a false quiesce argument, actually attempt the
|
|
* removal.
|
|
*
|
|
* When called with a force argument, attempt to switch all TCBs to
|
|
* use the default stack instead of returning EBUSY.
|
|
*
|
|
* Returns 0 on success (or if the removal would succeed, or an error
|
|
* code on failure.
|
|
*/
|
|
int
|
|
deregister_tcp_functions(struct tcp_function_block *blk, bool quiesce,
|
|
bool force)
|
|
{
|
|
struct tcp_function *f;
|
|
|
|
if (strcmp(blk->tfb_tcp_block_name, "default") == 0) {
|
|
/* You can't un-register the default */
|
|
return (EPERM);
|
|
}
|
|
rw_wlock(&tcp_function_lock);
|
|
if (blk == tcp_func_set_ptr) {
|
|
/* You can't free the current default */
|
|
rw_wunlock(&tcp_function_lock);
|
|
return (EBUSY);
|
|
}
|
|
/* Mark the block so no more stacks can use it. */
|
|
blk->tfb_flags |= TCP_FUNC_BEING_REMOVED;
|
|
/*
|
|
* If TCBs are still attached to the stack, attempt to switch them
|
|
* to the default stack.
|
|
*/
|
|
if (force && blk->tfb_refcnt) {
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
VNET_ITERATOR_DECL(vnet_iter);
|
|
|
|
rw_wunlock(&tcp_function_lock);
|
|
|
|
VNET_LIST_RLOCK();
|
|
VNET_FOREACH(vnet_iter) {
|
|
CURVNET_SET(vnet_iter);
|
|
INP_INFO_WLOCK(&V_tcbinfo);
|
|
LIST_FOREACH(inp, V_tcbinfo.ipi_listhead, inp_list) {
|
|
INP_WLOCK(inp);
|
|
if (inp->inp_flags & INP_TIMEWAIT) {
|
|
INP_WUNLOCK(inp);
|
|
continue;
|
|
}
|
|
tp = intotcpcb(inp);
|
|
if (tp == NULL || tp->t_fb != blk) {
|
|
INP_WUNLOCK(inp);
|
|
continue;
|
|
}
|
|
tcp_switch_back_to_default(tp);
|
|
INP_WUNLOCK(inp);
|
|
}
|
|
INP_INFO_WUNLOCK(&V_tcbinfo);
|
|
CURVNET_RESTORE();
|
|
}
|
|
VNET_LIST_RUNLOCK();
|
|
|
|
rw_wlock(&tcp_function_lock);
|
|
}
|
|
if (blk->tfb_refcnt) {
|
|
/* TCBs still attached. */
|
|
rw_wunlock(&tcp_function_lock);
|
|
return (EBUSY);
|
|
}
|
|
if (quiesce) {
|
|
/* Skip removal. */
|
|
rw_wunlock(&tcp_function_lock);
|
|
return (0);
|
|
}
|
|
/* Remove any function names that map to this function block. */
|
|
while (find_tcp_fb_locked(blk, &f) != NULL) {
|
|
TAILQ_REMOVE(&t_functions, f, tf_next);
|
|
tcp_fb_cnt--;
|
|
f->tf_fb = NULL;
|
|
free(f, M_TCPFUNCTIONS);
|
|
}
|
|
rw_wunlock(&tcp_function_lock);
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
tcp_init(void)
|
|
{
|
|
const char *tcbhash_tuneable;
|
|
int hashsize;
|
|
|
|
tcbhash_tuneable = "net.inet.tcp.tcbhashsize";
|
|
|
|
#ifdef TCP_HHOOK
|
|
if (hhook_head_register(HHOOK_TYPE_TCP, HHOOK_TCP_EST_IN,
|
|
&V_tcp_hhh[HHOOK_TCP_EST_IN], HHOOK_NOWAIT|HHOOK_HEADISINVNET) != 0)
|
|
printf("%s: WARNING: unable to register helper hook\n", __func__);
|
|
if (hhook_head_register(HHOOK_TYPE_TCP, HHOOK_TCP_EST_OUT,
|
|
&V_tcp_hhh[HHOOK_TCP_EST_OUT], HHOOK_NOWAIT|HHOOK_HEADISINVNET) != 0)
|
|
printf("%s: WARNING: unable to register helper hook\n", __func__);
|
|
#endif
|
|
hashsize = TCBHASHSIZE;
|
|
TUNABLE_INT_FETCH(tcbhash_tuneable, &hashsize);
|
|
if (hashsize == 0) {
|
|
/*
|
|
* Auto tune the hash size based on maxsockets.
|
|
* A perfect hash would have a 1:1 mapping
|
|
* (hashsize = maxsockets) however it's been
|
|
* suggested that O(2) average is better.
|
|
*/
|
|
hashsize = maketcp_hashsize(maxsockets / 4);
|
|
/*
|
|
* Our historical default is 512,
|
|
* do not autotune lower than this.
|
|
*/
|
|
if (hashsize < 512)
|
|
hashsize = 512;
|
|
if (bootverbose && IS_DEFAULT_VNET(curvnet))
|
|
printf("%s: %s auto tuned to %d\n", __func__,
|
|
tcbhash_tuneable, hashsize);
|
|
}
|
|
/*
|
|
* We require a hashsize to be a power of two.
|
|
* Previously if it was not a power of two we would just reset it
|
|
* back to 512, which could be a nasty surprise if you did not notice
|
|
* the error message.
|
|
* Instead what we do is clip it to the closest power of two lower
|
|
* than the specified hash value.
|
|
*/
|
|
if (!powerof2(hashsize)) {
|
|
int oldhashsize = hashsize;
|
|
|
|
hashsize = maketcp_hashsize(hashsize);
|
|
/* prevent absurdly low value */
|
|
if (hashsize < 16)
|
|
hashsize = 16;
|
|
printf("%s: WARNING: TCB hash size not a power of 2, "
|
|
"clipped from %d to %d.\n", __func__, oldhashsize,
|
|
hashsize);
|
|
}
|
|
in_pcbinfo_init(&V_tcbinfo, "tcp", &V_tcb, hashsize, hashsize,
|
|
"tcp_inpcb", tcp_inpcb_init, IPI_HASHFIELDS_4TUPLE);
|
|
|
|
/*
|
|
* These have to be type stable for the benefit of the timers.
|
|
*/
|
|
V_tcpcb_zone = uma_zcreate("tcpcb", sizeof(struct tcpcb_mem),
|
|
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
|
|
uma_zone_set_max(V_tcpcb_zone, maxsockets);
|
|
uma_zone_set_warning(V_tcpcb_zone, "kern.ipc.maxsockets limit reached");
|
|
|
|
tcp_tw_init();
|
|
syncache_init();
|
|
tcp_hc_init();
|
|
|
|
TUNABLE_INT_FETCH("net.inet.tcp.sack.enable", &V_tcp_do_sack);
|
|
V_sack_hole_zone = uma_zcreate("sackhole", sizeof(struct sackhole),
|
|
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
|
|
|
|
tcp_fastopen_init();
|
|
|
|
/* Skip initialization of globals for non-default instances. */
|
|
if (!IS_DEFAULT_VNET(curvnet))
|
|
return;
|
|
|
|
tcp_reass_global_init();
|
|
|
|
/* XXX virtualize those bellow? */
|
|
tcp_delacktime = TCPTV_DELACK;
|
|
tcp_keepinit = TCPTV_KEEP_INIT;
|
|
tcp_keepidle = TCPTV_KEEP_IDLE;
|
|
tcp_keepintvl = TCPTV_KEEPINTVL;
|
|
tcp_maxpersistidle = TCPTV_KEEP_IDLE;
|
|
tcp_msl = TCPTV_MSL;
|
|
tcp_rexmit_min = TCPTV_MIN;
|
|
if (tcp_rexmit_min < 1)
|
|
tcp_rexmit_min = 1;
|
|
tcp_persmin = TCPTV_PERSMIN;
|
|
tcp_persmax = TCPTV_PERSMAX;
|
|
tcp_rexmit_slop = TCPTV_CPU_VAR;
|
|
tcp_finwait2_timeout = TCPTV_FINWAIT2_TIMEOUT;
|
|
tcp_tcbhashsize = hashsize;
|
|
/* Setup the tcp function block list */
|
|
init_tcp_functions();
|
|
register_tcp_functions(&tcp_def_funcblk, M_WAITOK);
|
|
#ifdef TCP_BLACKBOX
|
|
/* Initialize the TCP logging data. */
|
|
tcp_log_init();
|
|
#endif
|
|
|
|
if (tcp_soreceive_stream) {
|
|
#ifdef INET
|
|
tcp_usrreqs.pru_soreceive = soreceive_stream;
|
|
#endif
|
|
#ifdef INET6
|
|
tcp6_usrreqs.pru_soreceive = soreceive_stream;
|
|
#endif /* INET6 */
|
|
}
|
|
|
|
#ifdef INET6
|
|
#define TCP_MINPROTOHDR (sizeof(struct ip6_hdr) + sizeof(struct tcphdr))
|
|
#else /* INET6 */
|
|
#define TCP_MINPROTOHDR (sizeof(struct tcpiphdr))
|
|
#endif /* INET6 */
|
|
if (max_protohdr < TCP_MINPROTOHDR)
|
|
max_protohdr = TCP_MINPROTOHDR;
|
|
if (max_linkhdr + TCP_MINPROTOHDR > MHLEN)
|
|
panic("tcp_init");
|
|
#undef TCP_MINPROTOHDR
|
|
|
|
ISN_LOCK_INIT();
|
|
EVENTHANDLER_REGISTER(shutdown_pre_sync, tcp_fini, NULL,
|
|
SHUTDOWN_PRI_DEFAULT);
|
|
EVENTHANDLER_REGISTER(maxsockets_change, tcp_zone_change, NULL,
|
|
EVENTHANDLER_PRI_ANY);
|
|
#ifdef TCPPCAP
|
|
tcp_pcap_init();
|
|
#endif
|
|
}
|
|
|
|
#ifdef VIMAGE
|
|
static void
|
|
tcp_destroy(void *unused __unused)
|
|
{
|
|
int n;
|
|
#ifdef TCP_HHOOK
|
|
int error;
|
|
#endif
|
|
|
|
/*
|
|
* All our processes are gone, all our sockets should be cleaned
|
|
* up, which means, we should be past the tcp_discardcb() calls.
|
|
* Sleep to let all tcpcb timers really disappear and cleanup.
|
|
*/
|
|
for (;;) {
|
|
INP_LIST_RLOCK(&V_tcbinfo);
|
|
n = V_tcbinfo.ipi_count;
|
|
INP_LIST_RUNLOCK(&V_tcbinfo);
|
|
if (n == 0)
|
|
break;
|
|
pause("tcpdes", hz / 10);
|
|
}
|
|
tcp_hc_destroy();
|
|
syncache_destroy();
|
|
tcp_tw_destroy();
|
|
in_pcbinfo_destroy(&V_tcbinfo);
|
|
/* tcp_discardcb() clears the sack_holes up. */
|
|
uma_zdestroy(V_sack_hole_zone);
|
|
uma_zdestroy(V_tcpcb_zone);
|
|
|
|
/*
|
|
* Cannot free the zone until all tcpcbs are released as we attach
|
|
* the allocations to them.
|
|
*/
|
|
tcp_fastopen_destroy();
|
|
|
|
#ifdef TCP_HHOOK
|
|
error = hhook_head_deregister(V_tcp_hhh[HHOOK_TCP_EST_IN]);
|
|
if (error != 0) {
|
|
printf("%s: WARNING: unable to deregister helper hook "
|
|
"type=%d, id=%d: error %d returned\n", __func__,
|
|
HHOOK_TYPE_TCP, HHOOK_TCP_EST_IN, error);
|
|
}
|
|
error = hhook_head_deregister(V_tcp_hhh[HHOOK_TCP_EST_OUT]);
|
|
if (error != 0) {
|
|
printf("%s: WARNING: unable to deregister helper hook "
|
|
"type=%d, id=%d: error %d returned\n", __func__,
|
|
HHOOK_TYPE_TCP, HHOOK_TCP_EST_OUT, error);
|
|
}
|
|
#endif
|
|
}
|
|
VNET_SYSUNINIT(tcp, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, tcp_destroy, NULL);
|
|
#endif
|
|
|
|
void
|
|
tcp_fini(void *xtp)
|
|
{
|
|
|
|
}
|
|
|
|
/*
|
|
* Fill in the IP and TCP headers for an outgoing packet, given the tcpcb.
|
|
* tcp_template used to store this data in mbufs, but we now recopy it out
|
|
* of the tcpcb each time to conserve mbufs.
|
|
*/
|
|
void
|
|
tcpip_fillheaders(struct inpcb *inp, void *ip_ptr, void *tcp_ptr)
|
|
{
|
|
struct tcphdr *th = (struct tcphdr *)tcp_ptr;
|
|
|
|
INP_WLOCK_ASSERT(inp);
|
|
|
|
#ifdef INET6
|
|
if ((inp->inp_vflag & INP_IPV6) != 0) {
|
|
struct ip6_hdr *ip6;
|
|
|
|
ip6 = (struct ip6_hdr *)ip_ptr;
|
|
ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
|
|
(inp->inp_flow & IPV6_FLOWINFO_MASK);
|
|
ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
|
|
(IPV6_VERSION & IPV6_VERSION_MASK);
|
|
ip6->ip6_nxt = IPPROTO_TCP;
|
|
ip6->ip6_plen = htons(sizeof(struct tcphdr));
|
|
ip6->ip6_src = inp->in6p_laddr;
|
|
ip6->ip6_dst = inp->in6p_faddr;
|
|
}
|
|
#endif /* INET6 */
|
|
#if defined(INET6) && defined(INET)
|
|
else
|
|
#endif
|
|
#ifdef INET
|
|
{
|
|
struct ip *ip;
|
|
|
|
ip = (struct ip *)ip_ptr;
|
|
ip->ip_v = IPVERSION;
|
|
ip->ip_hl = 5;
|
|
ip->ip_tos = inp->inp_ip_tos;
|
|
ip->ip_len = 0;
|
|
ip->ip_id = 0;
|
|
ip->ip_off = 0;
|
|
ip->ip_ttl = inp->inp_ip_ttl;
|
|
ip->ip_sum = 0;
|
|
ip->ip_p = IPPROTO_TCP;
|
|
ip->ip_src = inp->inp_laddr;
|
|
ip->ip_dst = inp->inp_faddr;
|
|
}
|
|
#endif /* INET */
|
|
th->th_sport = inp->inp_lport;
|
|
th->th_dport = inp->inp_fport;
|
|
th->th_seq = 0;
|
|
th->th_ack = 0;
|
|
th->th_x2 = 0;
|
|
th->th_off = 5;
|
|
th->th_flags = 0;
|
|
th->th_win = 0;
|
|
th->th_urp = 0;
|
|
th->th_sum = 0; /* in_pseudo() is called later for ipv4 */
|
|
}
|
|
|
|
/*
|
|
* Create template to be used to send tcp packets on a connection.
|
|
* Allocates an mbuf and fills in a skeletal tcp/ip header. The only
|
|
* use for this function is in keepalives, which use tcp_respond.
|
|
*/
|
|
struct tcptemp *
|
|
tcpip_maketemplate(struct inpcb *inp)
|
|
{
|
|
struct tcptemp *t;
|
|
|
|
t = malloc(sizeof(*t), M_TEMP, M_NOWAIT);
|
|
if (t == NULL)
|
|
return (NULL);
|
|
tcpip_fillheaders(inp, (void *)&t->tt_ipgen, (void *)&t->tt_t);
|
|
return (t);
|
|
}
|
|
|
|
/*
|
|
* Send a single message to the TCP at address specified by
|
|
* the given TCP/IP header. If m == NULL, then we make a copy
|
|
* of the tcpiphdr at th and send directly to the addressed host.
|
|
* This is used to force keep alive messages out using the TCP
|
|
* template for a connection. If flags are given then we send
|
|
* a message back to the TCP which originated the segment th,
|
|
* and discard the mbuf containing it and any other attached mbufs.
|
|
*
|
|
* In any case the ack and sequence number of the transmitted
|
|
* segment are as specified by the parameters.
|
|
*
|
|
* NOTE: If m != NULL, then th must point to *inside* the mbuf.
|
|
*/
|
|
void
|
|
tcp_respond(struct tcpcb *tp, void *ipgen, struct tcphdr *th, struct mbuf *m,
|
|
tcp_seq ack, tcp_seq seq, int flags)
|
|
{
|
|
struct tcpopt to;
|
|
struct inpcb *inp;
|
|
struct ip *ip;
|
|
struct mbuf *optm;
|
|
struct tcphdr *nth;
|
|
u_char *optp;
|
|
#ifdef INET6
|
|
struct ip6_hdr *ip6;
|
|
int isipv6;
|
|
#endif /* INET6 */
|
|
int optlen, tlen, win;
|
|
bool incl_opts;
|
|
|
|
KASSERT(tp != NULL || m != NULL, ("tcp_respond: tp and m both NULL"));
|
|
|
|
#ifdef INET6
|
|
isipv6 = ((struct ip *)ipgen)->ip_v == (IPV6_VERSION >> 4);
|
|
ip6 = ipgen;
|
|
#endif /* INET6 */
|
|
ip = ipgen;
|
|
|
|
if (tp != NULL) {
|
|
inp = tp->t_inpcb;
|
|
KASSERT(inp != NULL, ("tcp control block w/o inpcb"));
|
|
INP_WLOCK_ASSERT(inp);
|
|
} else
|
|
inp = NULL;
|
|
|
|
incl_opts = false;
|
|
win = 0;
|
|
if (tp != NULL) {
|
|
if (!(flags & TH_RST)) {
|
|
win = sbspace(&inp->inp_socket->so_rcv);
|
|
if (win > TCP_MAXWIN << tp->rcv_scale)
|
|
win = TCP_MAXWIN << tp->rcv_scale;
|
|
}
|
|
if ((tp->t_flags & TF_NOOPT) == 0)
|
|
incl_opts = true;
|
|
}
|
|
if (m == NULL) {
|
|
m = m_gethdr(M_NOWAIT, MT_DATA);
|
|
if (m == NULL)
|
|
return;
|
|
m->m_data += max_linkhdr;
|
|
#ifdef INET6
|
|
if (isipv6) {
|
|
bcopy((caddr_t)ip6, mtod(m, caddr_t),
|
|
sizeof(struct ip6_hdr));
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
nth = (struct tcphdr *)(ip6 + 1);
|
|
} else
|
|
#endif /* INET6 */
|
|
{
|
|
bcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip));
|
|
ip = mtod(m, struct ip *);
|
|
nth = (struct tcphdr *)(ip + 1);
|
|
}
|
|
bcopy((caddr_t)th, (caddr_t)nth, sizeof(struct tcphdr));
|
|
flags = TH_ACK;
|
|
} else if (!M_WRITABLE(m)) {
|
|
struct mbuf *n;
|
|
|
|
/* Can't reuse 'm', allocate a new mbuf. */
|
|
n = m_gethdr(M_NOWAIT, MT_DATA);
|
|
if (n == NULL) {
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
if (!m_dup_pkthdr(n, m, M_NOWAIT)) {
|
|
m_freem(m);
|
|
m_freem(n);
|
|
return;
|
|
}
|
|
|
|
n->m_data += max_linkhdr;
|
|
/* m_len is set later */
|
|
#define xchg(a,b,type) { type t; t=a; a=b; b=t; }
|
|
#ifdef INET6
|
|
if (isipv6) {
|
|
bcopy((caddr_t)ip6, mtod(n, caddr_t),
|
|
sizeof(struct ip6_hdr));
|
|
ip6 = mtod(n, struct ip6_hdr *);
|
|
xchg(ip6->ip6_dst, ip6->ip6_src, struct in6_addr);
|
|
nth = (struct tcphdr *)(ip6 + 1);
|
|
} else
|
|
#endif /* INET6 */
|
|
{
|
|
bcopy((caddr_t)ip, mtod(n, caddr_t), sizeof(struct ip));
|
|
ip = mtod(n, struct ip *);
|
|
xchg(ip->ip_dst.s_addr, ip->ip_src.s_addr, uint32_t);
|
|
nth = (struct tcphdr *)(ip + 1);
|
|
}
|
|
bcopy((caddr_t)th, (caddr_t)nth, sizeof(struct tcphdr));
|
|
xchg(nth->th_dport, nth->th_sport, uint16_t);
|
|
th = nth;
|
|
m_freem(m);
|
|
m = n;
|
|
} else {
|
|
/*
|
|
* reuse the mbuf.
|
|
* XXX MRT We inherit the FIB, which is lucky.
|
|
*/
|
|
m_freem(m->m_next);
|
|
m->m_next = NULL;
|
|
m->m_data = (caddr_t)ipgen;
|
|
/* m_len is set later */
|
|
#ifdef INET6
|
|
if (isipv6) {
|
|
xchg(ip6->ip6_dst, ip6->ip6_src, struct in6_addr);
|
|
nth = (struct tcphdr *)(ip6 + 1);
|
|
} else
|
|
#endif /* INET6 */
|
|
{
|
|
xchg(ip->ip_dst.s_addr, ip->ip_src.s_addr, uint32_t);
|
|
nth = (struct tcphdr *)(ip + 1);
|
|
}
|
|
if (th != nth) {
|
|
/*
|
|
* this is usually a case when an extension header
|
|
* exists between the IPv6 header and the
|
|
* TCP header.
|
|
*/
|
|
nth->th_sport = th->th_sport;
|
|
nth->th_dport = th->th_dport;
|
|
}
|
|
xchg(nth->th_dport, nth->th_sport, uint16_t);
|
|
#undef xchg
|
|
}
|
|
tlen = 0;
|
|
#ifdef INET6
|
|
if (isipv6)
|
|
tlen = sizeof (struct ip6_hdr) + sizeof (struct tcphdr);
|
|
#endif
|
|
#if defined(INET) && defined(INET6)
|
|
else
|
|
#endif
|
|
#ifdef INET
|
|
tlen = sizeof (struct tcpiphdr);
|
|
#endif
|
|
#ifdef INVARIANTS
|
|
m->m_len = 0;
|
|
KASSERT(M_TRAILINGSPACE(m) >= tlen,
|
|
("Not enough trailing space for message (m=%p, need=%d, have=%ld)",
|
|
m, tlen, (long)M_TRAILINGSPACE(m)));
|
|
#endif
|
|
m->m_len = tlen;
|
|
to.to_flags = 0;
|
|
if (incl_opts) {
|
|
/* Make sure we have room. */
|
|
if (M_TRAILINGSPACE(m) < TCP_MAXOLEN) {
|
|
m->m_next = m_get(M_NOWAIT, MT_DATA);
|
|
if (m->m_next) {
|
|
optp = mtod(m->m_next, u_char *);
|
|
optm = m->m_next;
|
|
} else
|
|
incl_opts = false;
|
|
} else {
|
|
optp = (u_char *) (nth + 1);
|
|
optm = m;
|
|
}
|
|
}
|
|
if (incl_opts) {
|
|
/* Timestamps. */
|
|
if (tp->t_flags & TF_RCVD_TSTMP) {
|
|
to.to_tsval = tcp_ts_getticks() + tp->ts_offset;
|
|
to.to_tsecr = tp->ts_recent;
|
|
to.to_flags |= TOF_TS;
|
|
}
|
|
#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
|
|
/* TCP-MD5 (RFC2385). */
|
|
if (tp->t_flags & TF_SIGNATURE)
|
|
to.to_flags |= TOF_SIGNATURE;
|
|
#endif
|
|
/* Add the options. */
|
|
tlen += optlen = tcp_addoptions(&to, optp);
|
|
|
|
/* Update m_len in the correct mbuf. */
|
|
optm->m_len += optlen;
|
|
} else
|
|
optlen = 0;
|
|
#ifdef INET6
|
|
if (isipv6) {
|
|
ip6->ip6_flow = 0;
|
|
ip6->ip6_vfc = IPV6_VERSION;
|
|
ip6->ip6_nxt = IPPROTO_TCP;
|
|
ip6->ip6_plen = htons(tlen - sizeof(*ip6));
|
|
}
|
|
#endif
|
|
#if defined(INET) && defined(INET6)
|
|
else
|
|
#endif
|
|
#ifdef INET
|
|
{
|
|
ip->ip_len = htons(tlen);
|
|
ip->ip_ttl = V_ip_defttl;
|
|
if (V_path_mtu_discovery)
|
|
ip->ip_off |= htons(IP_DF);
|
|
}
|
|
#endif
|
|
m->m_pkthdr.len = tlen;
|
|
m->m_pkthdr.rcvif = NULL;
|
|
#ifdef MAC
|
|
if (inp != NULL) {
|
|
/*
|
|
* Packet is associated with a socket, so allow the
|
|
* label of the response to reflect the socket label.
|
|
*/
|
|
INP_WLOCK_ASSERT(inp);
|
|
mac_inpcb_create_mbuf(inp, m);
|
|
} else {
|
|
/*
|
|
* Packet is not associated with a socket, so possibly
|
|
* update the label in place.
|
|
*/
|
|
mac_netinet_tcp_reply(m);
|
|
}
|
|
#endif
|
|
nth->th_seq = htonl(seq);
|
|
nth->th_ack = htonl(ack);
|
|
nth->th_x2 = 0;
|
|
nth->th_off = (sizeof (struct tcphdr) + optlen) >> 2;
|
|
nth->th_flags = flags;
|
|
if (tp != NULL)
|
|
nth->th_win = htons((u_short) (win >> tp->rcv_scale));
|
|
else
|
|
nth->th_win = htons((u_short)win);
|
|
nth->th_urp = 0;
|
|
|
|
#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
|
|
if (to.to_flags & TOF_SIGNATURE) {
|
|
if (!TCPMD5_ENABLED() ||
|
|
TCPMD5_OUTPUT(m, nth, to.to_signature) != 0) {
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
|
|
#ifdef INET6
|
|
if (isipv6) {
|
|
m->m_pkthdr.csum_flags = CSUM_TCP_IPV6;
|
|
nth->th_sum = in6_cksum_pseudo(ip6,
|
|
tlen - sizeof(struct ip6_hdr), IPPROTO_TCP, 0);
|
|
ip6->ip6_hlim = in6_selecthlim(tp != NULL ? tp->t_inpcb :
|
|
NULL, NULL);
|
|
}
|
|
#endif /* INET6 */
|
|
#if defined(INET6) && defined(INET)
|
|
else
|
|
#endif
|
|
#ifdef INET
|
|
{
|
|
m->m_pkthdr.csum_flags = CSUM_TCP;
|
|
nth->th_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
|
|
htons((u_short)(tlen - sizeof(struct ip) + ip->ip_p)));
|
|
}
|
|
#endif /* INET */
|
|
#ifdef TCPDEBUG
|
|
if (tp == NULL || (inp->inp_socket->so_options & SO_DEBUG))
|
|
tcp_trace(TA_OUTPUT, 0, tp, mtod(m, void *), th, 0);
|
|
#endif
|
|
TCP_PROBE3(debug__output, tp, th, m);
|
|
if (flags & TH_RST)
|
|
TCP_PROBE5(accept__refused, NULL, NULL, m, tp, nth);
|
|
|
|
#ifdef INET6
|
|
if (isipv6) {
|
|
TCP_PROBE5(send, NULL, tp, ip6, tp, nth);
|
|
(void)ip6_output(m, NULL, NULL, 0, NULL, NULL, inp);
|
|
}
|
|
#endif /* INET6 */
|
|
#if defined(INET) && defined(INET6)
|
|
else
|
|
#endif
|
|
#ifdef INET
|
|
{
|
|
TCP_PROBE5(send, NULL, tp, ip, tp, nth);
|
|
(void)ip_output(m, NULL, NULL, 0, NULL, inp);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Create a new TCP control block, making an
|
|
* empty reassembly queue and hooking it to the argument
|
|
* protocol control block. The `inp' parameter must have
|
|
* come from the zone allocator set up in tcp_init().
|
|
*/
|
|
struct tcpcb *
|
|
tcp_newtcpcb(struct inpcb *inp)
|
|
{
|
|
struct tcpcb_mem *tm;
|
|
struct tcpcb *tp;
|
|
#ifdef INET6
|
|
int isipv6 = (inp->inp_vflag & INP_IPV6) != 0;
|
|
#endif /* INET6 */
|
|
|
|
tm = uma_zalloc(V_tcpcb_zone, M_NOWAIT | M_ZERO);
|
|
if (tm == NULL)
|
|
return (NULL);
|
|
tp = &tm->tcb;
|
|
|
|
/* Initialise cc_var struct for this tcpcb. */
|
|
tp->ccv = &tm->ccv;
|
|
tp->ccv->type = IPPROTO_TCP;
|
|
tp->ccv->ccvc.tcp = tp;
|
|
rw_rlock(&tcp_function_lock);
|
|
tp->t_fb = tcp_func_set_ptr;
|
|
refcount_acquire(&tp->t_fb->tfb_refcnt);
|
|
rw_runlock(&tcp_function_lock);
|
|
/*
|
|
* Use the current system default CC algorithm.
|
|
*/
|
|
CC_LIST_RLOCK();
|
|
KASSERT(!STAILQ_EMPTY(&cc_list), ("cc_list is empty!"));
|
|
CC_ALGO(tp) = CC_DEFAULT();
|
|
CC_LIST_RUNLOCK();
|
|
|
|
if (CC_ALGO(tp)->cb_init != NULL)
|
|
if (CC_ALGO(tp)->cb_init(tp->ccv) > 0) {
|
|
if (tp->t_fb->tfb_tcp_fb_fini)
|
|
(*tp->t_fb->tfb_tcp_fb_fini)(tp, 1);
|
|
refcount_release(&tp->t_fb->tfb_refcnt);
|
|
uma_zfree(V_tcpcb_zone, tm);
|
|
return (NULL);
|
|
}
|
|
|
|
#ifdef TCP_HHOOK
|
|
tp->osd = &tm->osd;
|
|
if (khelp_init_osd(HELPER_CLASS_TCP, tp->osd)) {
|
|
if (tp->t_fb->tfb_tcp_fb_fini)
|
|
(*tp->t_fb->tfb_tcp_fb_fini)(tp, 1);
|
|
refcount_release(&tp->t_fb->tfb_refcnt);
|
|
uma_zfree(V_tcpcb_zone, tm);
|
|
return (NULL);
|
|
}
|
|
#endif
|
|
|
|
#ifdef VIMAGE
|
|
tp->t_vnet = inp->inp_vnet;
|
|
#endif
|
|
tp->t_timers = &tm->tt;
|
|
/* LIST_INIT(&tp->t_segq); */ /* XXX covered by M_ZERO */
|
|
tp->t_maxseg =
|
|
#ifdef INET6
|
|
isipv6 ? V_tcp_v6mssdflt :
|
|
#endif /* INET6 */
|
|
V_tcp_mssdflt;
|
|
|
|
/* Set up our timeouts. */
|
|
callout_init(&tp->t_timers->tt_rexmt, 1);
|
|
callout_init(&tp->t_timers->tt_persist, 1);
|
|
callout_init(&tp->t_timers->tt_keep, 1);
|
|
callout_init(&tp->t_timers->tt_2msl, 1);
|
|
callout_init(&tp->t_timers->tt_delack, 1);
|
|
|
|
if (V_tcp_do_rfc1323)
|
|
tp->t_flags = (TF_REQ_SCALE|TF_REQ_TSTMP);
|
|
if (V_tcp_do_sack)
|
|
tp->t_flags |= TF_SACK_PERMIT;
|
|
TAILQ_INIT(&tp->snd_holes);
|
|
/*
|
|
* The tcpcb will hold a reference on its inpcb until tcp_discardcb()
|
|
* is called.
|
|
*/
|
|
in_pcbref(inp); /* Reference for tcpcb */
|
|
tp->t_inpcb = inp;
|
|
|
|
/*
|
|
* Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
|
|
* rtt estimate. Set rttvar so that srtt + 4 * rttvar gives
|
|
* reasonable initial retransmit time.
|
|
*/
|
|
tp->t_srtt = TCPTV_SRTTBASE;
|
|
tp->t_rttvar = ((TCPTV_RTOBASE - TCPTV_SRTTBASE) << TCP_RTTVAR_SHIFT) / 4;
|
|
tp->t_rttmin = tcp_rexmit_min;
|
|
tp->t_rxtcur = TCPTV_RTOBASE;
|
|
tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
|
|
tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
|
|
tp->t_rcvtime = ticks;
|
|
/*
|
|
* IPv4 TTL initialization is necessary for an IPv6 socket as well,
|
|
* because the socket may be bound to an IPv6 wildcard address,
|
|
* which may match an IPv4-mapped IPv6 address.
|
|
*/
|
|
inp->inp_ip_ttl = V_ip_defttl;
|
|
inp->inp_ppcb = tp;
|
|
#ifdef TCPPCAP
|
|
/*
|
|
* Init the TCP PCAP queues.
|
|
*/
|
|
tcp_pcap_tcpcb_init(tp);
|
|
#endif
|
|
#ifdef TCP_BLACKBOX
|
|
/* Initialize the per-TCPCB log data. */
|
|
tcp_log_tcpcbinit(tp);
|
|
#endif
|
|
if (tp->t_fb->tfb_tcp_fb_init) {
|
|
(*tp->t_fb->tfb_tcp_fb_init)(tp);
|
|
}
|
|
return (tp); /* XXX */
|
|
}
|
|
|
|
/*
|
|
* Switch the congestion control algorithm back to NewReno for any active
|
|
* control blocks using an algorithm which is about to go away.
|
|
* This ensures the CC framework can allow the unload to proceed without leaving
|
|
* any dangling pointers which would trigger a panic.
|
|
* Returning non-zero would inform the CC framework that something went wrong
|
|
* and it would be unsafe to allow the unload to proceed. However, there is no
|
|
* way for this to occur with this implementation so we always return zero.
|
|
*/
|
|
int
|
|
tcp_ccalgounload(struct cc_algo *unload_algo)
|
|
{
|
|
struct cc_algo *tmpalgo;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
VNET_ITERATOR_DECL(vnet_iter);
|
|
|
|
/*
|
|
* Check all active control blocks across all network stacks and change
|
|
* any that are using "unload_algo" back to NewReno. If "unload_algo"
|
|
* requires cleanup code to be run, call it.
|
|
*/
|
|
VNET_LIST_RLOCK();
|
|
VNET_FOREACH(vnet_iter) {
|
|
CURVNET_SET(vnet_iter);
|
|
INP_INFO_WLOCK(&V_tcbinfo);
|
|
/*
|
|
* New connections already part way through being initialised
|
|
* with the CC algo we're removing will not race with this code
|
|
* because the INP_INFO_WLOCK is held during initialisation. We
|
|
* therefore don't enter the loop below until the connection
|
|
* list has stabilised.
|
|
*/
|
|
LIST_FOREACH(inp, &V_tcb, inp_list) {
|
|
INP_WLOCK(inp);
|
|
/* Important to skip tcptw structs. */
|
|
if (!(inp->inp_flags & INP_TIMEWAIT) &&
|
|
(tp = intotcpcb(inp)) != NULL) {
|
|
/*
|
|
* By holding INP_WLOCK here, we are assured
|
|
* that the connection is not currently
|
|
* executing inside the CC module's functions
|
|
* i.e. it is safe to make the switch back to
|
|
* NewReno.
|
|
*/
|
|
if (CC_ALGO(tp) == unload_algo) {
|
|
tmpalgo = CC_ALGO(tp);
|
|
/* NewReno does not require any init. */
|
|
CC_ALGO(tp) = &newreno_cc_algo;
|
|
if (tmpalgo->cb_destroy != NULL)
|
|
tmpalgo->cb_destroy(tp->ccv);
|
|
}
|
|
}
|
|
INP_WUNLOCK(inp);
|
|
}
|
|
INP_INFO_WUNLOCK(&V_tcbinfo);
|
|
CURVNET_RESTORE();
|
|
}
|
|
VNET_LIST_RUNLOCK();
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Drop a TCP connection, reporting
|
|
* the specified error. If connection is synchronized,
|
|
* then send a RST to peer.
|
|
*/
|
|
struct tcpcb *
|
|
tcp_drop(struct tcpcb *tp, int errno)
|
|
{
|
|
struct socket *so = tp->t_inpcb->inp_socket;
|
|
|
|
INP_INFO_LOCK_ASSERT(&V_tcbinfo);
|
|
INP_WLOCK_ASSERT(tp->t_inpcb);
|
|
|
|
if (TCPS_HAVERCVDSYN(tp->t_state)) {
|
|
tcp_state_change(tp, TCPS_CLOSED);
|
|
(void) tp->t_fb->tfb_tcp_output(tp);
|
|
TCPSTAT_INC(tcps_drops);
|
|
} else
|
|
TCPSTAT_INC(tcps_conndrops);
|
|
if (errno == ETIMEDOUT && tp->t_softerror)
|
|
errno = tp->t_softerror;
|
|
so->so_error = errno;
|
|
return (tcp_close(tp));
|
|
}
|
|
|
|
void
|
|
tcp_discardcb(struct tcpcb *tp)
|
|
{
|
|
struct inpcb *inp = tp->t_inpcb;
|
|
struct socket *so = inp->inp_socket;
|
|
#ifdef INET6
|
|
int isipv6 = (inp->inp_vflag & INP_IPV6) != 0;
|
|
#endif /* INET6 */
|
|
int released;
|
|
|
|
INP_WLOCK_ASSERT(inp);
|
|
|
|
/*
|
|
* Make sure that all of our timers are stopped before we delete the
|
|
* PCB.
|
|
*
|
|
* If stopping a timer fails, we schedule a discard function in same
|
|
* callout, and the last discard function called will take care of
|
|
* deleting the tcpcb.
|
|
*/
|
|
tp->t_timers->tt_draincnt = 0;
|
|
tcp_timer_stop(tp, TT_REXMT);
|
|
tcp_timer_stop(tp, TT_PERSIST);
|
|
tcp_timer_stop(tp, TT_KEEP);
|
|
tcp_timer_stop(tp, TT_2MSL);
|
|
tcp_timer_stop(tp, TT_DELACK);
|
|
if (tp->t_fb->tfb_tcp_timer_stop_all) {
|
|
/*
|
|
* Call the stop-all function of the methods,
|
|
* this function should call the tcp_timer_stop()
|
|
* method with each of the function specific timeouts.
|
|
* That stop will be called via the tfb_tcp_timer_stop()
|
|
* which should use the async drain function of the
|
|
* callout system (see tcp_var.h).
|
|
*/
|
|
tp->t_fb->tfb_tcp_timer_stop_all(tp);
|
|
}
|
|
|
|
/*
|
|
* If we got enough samples through the srtt filter,
|
|
* save the rtt and rttvar in the routing entry.
|
|
* 'Enough' is arbitrarily defined as 4 rtt samples.
|
|
* 4 samples is enough for the srtt filter to converge
|
|
* to within enough % of the correct value; fewer samples
|
|
* and we could save a bogus rtt. The danger is not high
|
|
* as tcp quickly recovers from everything.
|
|
* XXX: Works very well but needs some more statistics!
|
|
*/
|
|
if (tp->t_rttupdated >= 4) {
|
|
struct hc_metrics_lite metrics;
|
|
uint32_t ssthresh;
|
|
|
|
bzero(&metrics, sizeof(metrics));
|
|
/*
|
|
* Update the ssthresh always when the conditions below
|
|
* are satisfied. This gives us better new start value
|
|
* for the congestion avoidance for new connections.
|
|
* ssthresh is only set if packet loss occurred on a session.
|
|
*
|
|
* XXXRW: 'so' may be NULL here, and/or socket buffer may be
|
|
* being torn down. Ideally this code would not use 'so'.
|
|
*/
|
|
ssthresh = tp->snd_ssthresh;
|
|
if (ssthresh != 0 && ssthresh < so->so_snd.sb_hiwat / 2) {
|
|
/*
|
|
* convert the limit from user data bytes to
|
|
* packets then to packet data bytes.
|
|
*/
|
|
ssthresh = (ssthresh + tp->t_maxseg / 2) / tp->t_maxseg;
|
|
if (ssthresh < 2)
|
|
ssthresh = 2;
|
|
ssthresh *= (tp->t_maxseg +
|
|
#ifdef INET6
|
|
(isipv6 ? sizeof (struct ip6_hdr) +
|
|
sizeof (struct tcphdr) :
|
|
#endif
|
|
sizeof (struct tcpiphdr)
|
|
#ifdef INET6
|
|
)
|
|
#endif
|
|
);
|
|
} else
|
|
ssthresh = 0;
|
|
metrics.rmx_ssthresh = ssthresh;
|
|
|
|
metrics.rmx_rtt = tp->t_srtt;
|
|
metrics.rmx_rttvar = tp->t_rttvar;
|
|
metrics.rmx_cwnd = tp->snd_cwnd;
|
|
metrics.rmx_sendpipe = 0;
|
|
metrics.rmx_recvpipe = 0;
|
|
|
|
tcp_hc_update(&inp->inp_inc, &metrics);
|
|
}
|
|
|
|
/* free the reassembly queue, if any */
|
|
tcp_reass_flush(tp);
|
|
|
|
#ifdef TCP_OFFLOAD
|
|
/* Disconnect offload device, if any. */
|
|
if (tp->t_flags & TF_TOE)
|
|
tcp_offload_detach(tp);
|
|
#endif
|
|
|
|
tcp_free_sackholes(tp);
|
|
|
|
#ifdef TCPPCAP
|
|
/* Free the TCP PCAP queues. */
|
|
tcp_pcap_drain(&(tp->t_inpkts));
|
|
tcp_pcap_drain(&(tp->t_outpkts));
|
|
#endif
|
|
|
|
/* Allow the CC algorithm to clean up after itself. */
|
|
if (CC_ALGO(tp)->cb_destroy != NULL)
|
|
CC_ALGO(tp)->cb_destroy(tp->ccv);
|
|
|
|
#ifdef TCP_HHOOK
|
|
khelp_destroy_osd(tp->osd);
|
|
#endif
|
|
|
|
CC_ALGO(tp) = NULL;
|
|
inp->inp_ppcb = NULL;
|
|
if (tp->t_timers->tt_draincnt == 0) {
|
|
/* We own the last reference on tcpcb, let's free it. */
|
|
#ifdef TCP_BLACKBOX
|
|
tcp_log_tcpcbfini(tp);
|
|
#endif
|
|
TCPSTATES_DEC(tp->t_state);
|
|
if (tp->t_fb->tfb_tcp_fb_fini)
|
|
(*tp->t_fb->tfb_tcp_fb_fini)(tp, 1);
|
|
refcount_release(&tp->t_fb->tfb_refcnt);
|
|
tp->t_inpcb = NULL;
|
|
uma_zfree(V_tcpcb_zone, tp);
|
|
released = in_pcbrele_wlocked(inp);
|
|
KASSERT(!released, ("%s: inp %p should not have been released "
|
|
"here", __func__, inp));
|
|
}
|
|
}
|
|
|
|
void
|
|
tcp_timer_discard(void *ptp)
|
|
{
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
|
|
tp = (struct tcpcb *)ptp;
|
|
CURVNET_SET(tp->t_vnet);
|
|
INP_INFO_RLOCK(&V_tcbinfo);
|
|
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__));
|
|
tp->t_timers->tt_draincnt--;
|
|
if (tp->t_timers->tt_draincnt == 0) {
|
|
/* We own the last reference on this tcpcb, let's free it. */
|
|
#ifdef TCP_BLACKBOX
|
|
tcp_log_tcpcbfini(tp);
|
|
#endif
|
|
TCPSTATES_DEC(tp->t_state);
|
|
if (tp->t_fb->tfb_tcp_fb_fini)
|
|
(*tp->t_fb->tfb_tcp_fb_fini)(tp, 1);
|
|
refcount_release(&tp->t_fb->tfb_refcnt);
|
|
tp->t_inpcb = NULL;
|
|
uma_zfree(V_tcpcb_zone, tp);
|
|
if (in_pcbrele_wlocked(inp)) {
|
|
INP_INFO_RUNLOCK(&V_tcbinfo);
|
|
CURVNET_RESTORE();
|
|
return;
|
|
}
|
|
}
|
|
INP_WUNLOCK(inp);
|
|
INP_INFO_RUNLOCK(&V_tcbinfo);
|
|
CURVNET_RESTORE();
|
|
}
|
|
|
|
/*
|
|
* Attempt to close a TCP control block, marking it as dropped, and freeing
|
|
* the socket if we hold the only reference.
|
|
*/
|
|
struct tcpcb *
|
|
tcp_close(struct tcpcb *tp)
|
|
{
|
|
struct inpcb *inp = tp->t_inpcb;
|
|
struct socket *so;
|
|
|
|
INP_INFO_LOCK_ASSERT(&V_tcbinfo);
|
|
INP_WLOCK_ASSERT(inp);
|
|
|
|
#ifdef TCP_OFFLOAD
|
|
if (tp->t_state == TCPS_LISTEN)
|
|
tcp_offload_listen_stop(tp);
|
|
#endif
|
|
/*
|
|
* This releases the TFO pending counter resource for TFO listen
|
|
* sockets as well as passively-created TFO sockets that transition
|
|
* from SYN_RECEIVED to CLOSED.
|
|
*/
|
|
if (tp->t_tfo_pending) {
|
|
tcp_fastopen_decrement_counter(tp->t_tfo_pending);
|
|
tp->t_tfo_pending = NULL;
|
|
}
|
|
in_pcbdrop(inp);
|
|
TCPSTAT_INC(tcps_closed);
|
|
if (tp->t_state != TCPS_CLOSED)
|
|
tcp_state_change(tp, TCPS_CLOSED);
|
|
KASSERT(inp->inp_socket != NULL, ("tcp_close: inp_socket NULL"));
|
|
so = inp->inp_socket;
|
|
soisdisconnected(so);
|
|
if (inp->inp_flags & INP_SOCKREF) {
|
|
KASSERT(so->so_state & SS_PROTOREF,
|
|
("tcp_close: !SS_PROTOREF"));
|
|
inp->inp_flags &= ~INP_SOCKREF;
|
|
INP_WUNLOCK(inp);
|
|
SOCK_LOCK(so);
|
|
so->so_state &= ~SS_PROTOREF;
|
|
sofree(so);
|
|
return (NULL);
|
|
}
|
|
return (tp);
|
|
}
|
|
|
|
void
|
|
tcp_drain(void)
|
|
{
|
|
VNET_ITERATOR_DECL(vnet_iter);
|
|
|
|
if (!do_tcpdrain)
|
|
return;
|
|
|
|
VNET_LIST_RLOCK_NOSLEEP();
|
|
VNET_FOREACH(vnet_iter) {
|
|
CURVNET_SET(vnet_iter);
|
|
struct inpcb *inpb;
|
|
struct tcpcb *tcpb;
|
|
|
|
/*
|
|
* Walk the tcpbs, if existing, and flush the reassembly queue,
|
|
* if there is one...
|
|
* XXX: The "Net/3" implementation doesn't imply that the TCP
|
|
* reassembly queue should be flushed, but in a situation
|
|
* where we're really low on mbufs, this is potentially
|
|
* useful.
|
|
*/
|
|
INP_INFO_WLOCK(&V_tcbinfo);
|
|
LIST_FOREACH(inpb, V_tcbinfo.ipi_listhead, inp_list) {
|
|
if (inpb->inp_flags & INP_TIMEWAIT)
|
|
continue;
|
|
INP_WLOCK(inpb);
|
|
if ((tcpb = intotcpcb(inpb)) != NULL) {
|
|
tcp_reass_flush(tcpb);
|
|
tcp_clean_sackreport(tcpb);
|
|
#ifdef TCP_BLACKBOX
|
|
tcp_log_drain(tcpb);
|
|
#endif
|
|
#ifdef TCPPCAP
|
|
if (tcp_pcap_aggressive_free) {
|
|
/* Free the TCP PCAP queues. */
|
|
tcp_pcap_drain(&(tcpb->t_inpkts));
|
|
tcp_pcap_drain(&(tcpb->t_outpkts));
|
|
}
|
|
#endif
|
|
}
|
|
INP_WUNLOCK(inpb);
|
|
}
|
|
INP_INFO_WUNLOCK(&V_tcbinfo);
|
|
CURVNET_RESTORE();
|
|
}
|
|
VNET_LIST_RUNLOCK_NOSLEEP();
|
|
}
|
|
|
|
/*
|
|
* Notify a tcp user of an asynchronous error;
|
|
* store error as soft error, but wake up user
|
|
* (for now, won't do anything until can select for soft error).
|
|
*
|
|
* Do not wake up user since there currently is no mechanism for
|
|
* reporting soft errors (yet - a kqueue filter may be added).
|
|
*/
|
|
static struct inpcb *
|
|
tcp_notify(struct inpcb *inp, int error)
|
|
{
|
|
struct tcpcb *tp;
|
|
|
|
INP_INFO_LOCK_ASSERT(&V_tcbinfo);
|
|
INP_WLOCK_ASSERT(inp);
|
|
|
|
if ((inp->inp_flags & INP_TIMEWAIT) ||
|
|
(inp->inp_flags & INP_DROPPED))
|
|
return (inp);
|
|
|
|
tp = intotcpcb(inp);
|
|
KASSERT(tp != NULL, ("tcp_notify: tp == NULL"));
|
|
|
|
/*
|
|
* Ignore some errors if we are hooked up.
|
|
* If connection hasn't completed, has retransmitted several times,
|
|
* and receives a second error, give up now. This is better
|
|
* than waiting a long time to establish a connection that
|
|
* can never complete.
|
|
*/
|
|
if (tp->t_state == TCPS_ESTABLISHED &&
|
|
(error == EHOSTUNREACH || error == ENETUNREACH ||
|
|
error == EHOSTDOWN)) {
|
|
if (inp->inp_route.ro_rt) {
|
|
RTFREE(inp->inp_route.ro_rt);
|
|
inp->inp_route.ro_rt = (struct rtentry *)NULL;
|
|
}
|
|
return (inp);
|
|
} else if (tp->t_state < TCPS_ESTABLISHED && tp->t_rxtshift > 3 &&
|
|
tp->t_softerror) {
|
|
tp = tcp_drop(tp, error);
|
|
if (tp != NULL)
|
|
return (inp);
|
|
else
|
|
return (NULL);
|
|
} else {
|
|
tp->t_softerror = error;
|
|
return (inp);
|
|
}
|
|
#if 0
|
|
wakeup( &so->so_timeo);
|
|
sorwakeup(so);
|
|
sowwakeup(so);
|
|
#endif
|
|
}
|
|
|
|
static int
|
|
tcp_pcblist(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error, i, m, n, pcb_count;
|
|
struct inpcb *inp, **inp_list;
|
|
inp_gen_t gencnt;
|
|
struct xinpgen xig;
|
|
|
|
/*
|
|
* The process of preparing the TCB list is too time-consuming and
|
|
* resource-intensive to repeat twice on every request.
|
|
*/
|
|
if (req->oldptr == NULL) {
|
|
n = V_tcbinfo.ipi_count +
|
|
counter_u64_fetch(V_tcps_states[TCPS_SYN_RECEIVED]);
|
|
n += imax(n / 8, 10);
|
|
req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xtcpcb);
|
|
return (0);
|
|
}
|
|
|
|
if (req->newptr != NULL)
|
|
return (EPERM);
|
|
|
|
/*
|
|
* OK, now we're committed to doing something.
|
|
*/
|
|
INP_LIST_RLOCK(&V_tcbinfo);
|
|
gencnt = V_tcbinfo.ipi_gencnt;
|
|
n = V_tcbinfo.ipi_count;
|
|
INP_LIST_RUNLOCK(&V_tcbinfo);
|
|
|
|
m = counter_u64_fetch(V_tcps_states[TCPS_SYN_RECEIVED]);
|
|
|
|
error = sysctl_wire_old_buffer(req, 2 * (sizeof xig)
|
|
+ (n + m) * sizeof(struct xtcpcb));
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
xig.xig_len = sizeof xig;
|
|
xig.xig_count = n + m;
|
|
xig.xig_gen = gencnt;
|
|
xig.xig_sogen = so_gencnt;
|
|
error = SYSCTL_OUT(req, &xig, sizeof xig);
|
|
if (error)
|
|
return (error);
|
|
|
|
error = syncache_pcblist(req, m, &pcb_count);
|
|
if (error)
|
|
return (error);
|
|
|
|
inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
|
|
|
|
INP_INFO_WLOCK(&V_tcbinfo);
|
|
for (inp = LIST_FIRST(V_tcbinfo.ipi_listhead), i = 0;
|
|
inp != NULL && i < n; inp = LIST_NEXT(inp, inp_list)) {
|
|
INP_WLOCK(inp);
|
|
if (inp->inp_gencnt <= gencnt) {
|
|
/*
|
|
* XXX: This use of cr_cansee(), introduced with
|
|
* TCP state changes, is not quite right, but for
|
|
* now, better than nothing.
|
|
*/
|
|
if (inp->inp_flags & INP_TIMEWAIT) {
|
|
if (intotw(inp) != NULL)
|
|
error = cr_cansee(req->td->td_ucred,
|
|
intotw(inp)->tw_cred);
|
|
else
|
|
error = EINVAL; /* Skip this inp. */
|
|
} else
|
|
error = cr_canseeinpcb(req->td->td_ucred, inp);
|
|
if (error == 0) {
|
|
in_pcbref(inp);
|
|
inp_list[i++] = inp;
|
|
}
|
|
}
|
|
INP_WUNLOCK(inp);
|
|
}
|
|
INP_INFO_WUNLOCK(&V_tcbinfo);
|
|
n = i;
|
|
|
|
error = 0;
|
|
for (i = 0; i < n; i++) {
|
|
inp = inp_list[i];
|
|
INP_RLOCK(inp);
|
|
if (inp->inp_gencnt <= gencnt) {
|
|
struct xtcpcb xt;
|
|
|
|
tcp_inptoxtp(inp, &xt);
|
|
INP_RUNLOCK(inp);
|
|
error = SYSCTL_OUT(req, &xt, sizeof xt);
|
|
} else
|
|
INP_RUNLOCK(inp);
|
|
}
|
|
INP_INFO_RLOCK(&V_tcbinfo);
|
|
for (i = 0; i < n; i++) {
|
|
inp = inp_list[i];
|
|
INP_RLOCK(inp);
|
|
if (!in_pcbrele_rlocked(inp))
|
|
INP_RUNLOCK(inp);
|
|
}
|
|
INP_INFO_RUNLOCK(&V_tcbinfo);
|
|
|
|
if (!error) {
|
|
/*
|
|
* Give the user an updated idea of our state.
|
|
* If the generation differs from what we told
|
|
* her before, she knows that something happened
|
|
* while we were processing this request, and it
|
|
* might be necessary to retry.
|
|
*/
|
|
INP_LIST_RLOCK(&V_tcbinfo);
|
|
xig.xig_gen = V_tcbinfo.ipi_gencnt;
|
|
xig.xig_sogen = so_gencnt;
|
|
xig.xig_count = V_tcbinfo.ipi_count + pcb_count;
|
|
INP_LIST_RUNLOCK(&V_tcbinfo);
|
|
error = SYSCTL_OUT(req, &xig, sizeof xig);
|
|
}
|
|
free(inp_list, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_net_inet_tcp, TCPCTL_PCBLIST, pcblist,
|
|
CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0,
|
|
tcp_pcblist, "S,xtcpcb", "List of active TCP connections");
|
|
|
|
#ifdef INET
|
|
static int
|
|
tcp_getcred(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct xucred xuc;
|
|
struct sockaddr_in addrs[2];
|
|
struct inpcb *inp;
|
|
int error;
|
|
|
|
error = priv_check(req->td, PRIV_NETINET_GETCRED);
|
|
if (error)
|
|
return (error);
|
|
error = SYSCTL_IN(req, addrs, sizeof(addrs));
|
|
if (error)
|
|
return (error);
|
|
inp = in_pcblookup(&V_tcbinfo, addrs[1].sin_addr, addrs[1].sin_port,
|
|
addrs[0].sin_addr, addrs[0].sin_port, INPLOOKUP_RLOCKPCB, NULL);
|
|
if (inp != NULL) {
|
|
if (inp->inp_socket == NULL)
|
|
error = ENOENT;
|
|
if (error == 0)
|
|
error = cr_canseeinpcb(req->td->td_ucred, inp);
|
|
if (error == 0)
|
|
cru2x(inp->inp_cred, &xuc);
|
|
INP_RUNLOCK(inp);
|
|
} else
|
|
error = ENOENT;
|
|
if (error == 0)
|
|
error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_net_inet_tcp, OID_AUTO, getcred,
|
|
CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0,
|
|
tcp_getcred, "S,xucred", "Get the xucred of a TCP connection");
|
|
#endif /* INET */
|
|
|
|
#ifdef INET6
|
|
static int
|
|
tcp6_getcred(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct xucred xuc;
|
|
struct sockaddr_in6 addrs[2];
|
|
struct inpcb *inp;
|
|
int error;
|
|
#ifdef INET
|
|
int mapped = 0;
|
|
#endif
|
|
|
|
error = priv_check(req->td, PRIV_NETINET_GETCRED);
|
|
if (error)
|
|
return (error);
|
|
error = SYSCTL_IN(req, addrs, sizeof(addrs));
|
|
if (error)
|
|
return (error);
|
|
if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
|
|
(error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
|
|
return (error);
|
|
}
|
|
if (IN6_IS_ADDR_V4MAPPED(&addrs[0].sin6_addr)) {
|
|
#ifdef INET
|
|
if (IN6_IS_ADDR_V4MAPPED(&addrs[1].sin6_addr))
|
|
mapped = 1;
|
|
else
|
|
#endif
|
|
return (EINVAL);
|
|
}
|
|
|
|
#ifdef INET
|
|
if (mapped == 1)
|
|
inp = in_pcblookup(&V_tcbinfo,
|
|
*(struct in_addr *)&addrs[1].sin6_addr.s6_addr[12],
|
|
addrs[1].sin6_port,
|
|
*(struct in_addr *)&addrs[0].sin6_addr.s6_addr[12],
|
|
addrs[0].sin6_port, INPLOOKUP_RLOCKPCB, NULL);
|
|
else
|
|
#endif
|
|
inp = in6_pcblookup(&V_tcbinfo,
|
|
&addrs[1].sin6_addr, addrs[1].sin6_port,
|
|
&addrs[0].sin6_addr, addrs[0].sin6_port,
|
|
INPLOOKUP_RLOCKPCB, NULL);
|
|
if (inp != NULL) {
|
|
if (inp->inp_socket == NULL)
|
|
error = ENOENT;
|
|
if (error == 0)
|
|
error = cr_canseeinpcb(req->td->td_ucred, inp);
|
|
if (error == 0)
|
|
cru2x(inp->inp_cred, &xuc);
|
|
INP_RUNLOCK(inp);
|
|
} else
|
|
error = ENOENT;
|
|
if (error == 0)
|
|
error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_net_inet6_tcp6, OID_AUTO, getcred,
|
|
CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0,
|
|
tcp6_getcred, "S,xucred", "Get the xucred of a TCP6 connection");
|
|
#endif /* INET6 */
|
|
|
|
|
|
#ifdef INET
|
|
void
|
|
tcp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
|
|
{
|
|
struct ip *ip = vip;
|
|
struct tcphdr *th;
|
|
struct in_addr faddr;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
struct inpcb *(*notify)(struct inpcb *, int) = tcp_notify;
|
|
struct icmp *icp;
|
|
struct in_conninfo inc;
|
|
tcp_seq icmp_tcp_seq;
|
|
int mtu;
|
|
|
|
faddr = ((struct sockaddr_in *)sa)->sin_addr;
|
|
if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
|
|
return;
|
|
|
|
if (cmd == PRC_MSGSIZE)
|
|
notify = tcp_mtudisc_notify;
|
|
else if (V_icmp_may_rst && (cmd == PRC_UNREACH_ADMIN_PROHIB ||
|
|
cmd == PRC_UNREACH_PORT || cmd == PRC_UNREACH_PROTOCOL ||
|
|
cmd == PRC_TIMXCEED_INTRANS) && ip)
|
|
notify = tcp_drop_syn_sent;
|
|
|
|
/*
|
|
* Hostdead is ugly because it goes linearly through all PCBs.
|
|
* XXX: We never get this from ICMP, otherwise it makes an
|
|
* excellent DoS attack on machines with many connections.
|
|
*/
|
|
else if (cmd == PRC_HOSTDEAD)
|
|
ip = NULL;
|
|
else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
|
|
return;
|
|
|
|
if (ip == NULL) {
|
|
in_pcbnotifyall(&V_tcbinfo, faddr, inetctlerrmap[cmd], notify);
|
|
return;
|
|
}
|
|
|
|
icp = (struct icmp *)((caddr_t)ip - offsetof(struct icmp, icmp_ip));
|
|
th = (struct tcphdr *)((caddr_t)ip + (ip->ip_hl << 2));
|
|
INP_INFO_RLOCK(&V_tcbinfo);
|
|
inp = in_pcblookup(&V_tcbinfo, faddr, th->th_dport, ip->ip_src,
|
|
th->th_sport, INPLOOKUP_WLOCKPCB, NULL);
|
|
if (inp != NULL && PRC_IS_REDIRECT(cmd)) {
|
|
/* signal EHOSTDOWN, as it flushes the cached route */
|
|
inp = (*notify)(inp, EHOSTDOWN);
|
|
goto out;
|
|
}
|
|
icmp_tcp_seq = th->th_seq;
|
|
if (inp != NULL) {
|
|
if (!(inp->inp_flags & INP_TIMEWAIT) &&
|
|
!(inp->inp_flags & INP_DROPPED) &&
|
|
!(inp->inp_socket == NULL)) {
|
|
tp = intotcpcb(inp);
|
|
if (SEQ_GEQ(ntohl(icmp_tcp_seq), tp->snd_una) &&
|
|
SEQ_LT(ntohl(icmp_tcp_seq), tp->snd_max)) {
|
|
if (cmd == PRC_MSGSIZE) {
|
|
/*
|
|
* MTU discovery:
|
|
* If we got a needfrag set the MTU
|
|
* in the route to the suggested new
|
|
* value (if given) and then notify.
|
|
*/
|
|
mtu = ntohs(icp->icmp_nextmtu);
|
|
/*
|
|
* If no alternative MTU was
|
|
* proposed, try the next smaller
|
|
* one.
|
|
*/
|
|
if (!mtu)
|
|
mtu = ip_next_mtu(
|
|
ntohs(ip->ip_len), 1);
|
|
if (mtu < V_tcp_minmss +
|
|
sizeof(struct tcpiphdr))
|
|
mtu = V_tcp_minmss +
|
|
sizeof(struct tcpiphdr);
|
|
/*
|
|
* Only process the offered MTU if it
|
|
* is smaller than the current one.
|
|
*/
|
|
if (mtu < tp->t_maxseg +
|
|
sizeof(struct tcpiphdr)) {
|
|
bzero(&inc, sizeof(inc));
|
|
inc.inc_faddr = faddr;
|
|
inc.inc_fibnum =
|
|
inp->inp_inc.inc_fibnum;
|
|
tcp_hc_updatemtu(&inc, mtu);
|
|
tcp_mtudisc(inp, mtu);
|
|
}
|
|
} else
|
|
inp = (*notify)(inp,
|
|
inetctlerrmap[cmd]);
|
|
}
|
|
}
|
|
} else {
|
|
bzero(&inc, sizeof(inc));
|
|
inc.inc_fport = th->th_dport;
|
|
inc.inc_lport = th->th_sport;
|
|
inc.inc_faddr = faddr;
|
|
inc.inc_laddr = ip->ip_src;
|
|
syncache_unreach(&inc, icmp_tcp_seq);
|
|
}
|
|
out:
|
|
if (inp != NULL)
|
|
INP_WUNLOCK(inp);
|
|
INP_INFO_RUNLOCK(&V_tcbinfo);
|
|
}
|
|
#endif /* INET */
|
|
|
|
#ifdef INET6
|
|
void
|
|
tcp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
|
|
{
|
|
struct in6_addr *dst;
|
|
struct inpcb *(*notify)(struct inpcb *, int) = tcp_notify;
|
|
struct ip6_hdr *ip6;
|
|
struct mbuf *m;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
struct icmp6_hdr *icmp6;
|
|
struct ip6ctlparam *ip6cp = NULL;
|
|
const struct sockaddr_in6 *sa6_src = NULL;
|
|
struct in_conninfo inc;
|
|
struct tcp_ports {
|
|
uint16_t th_sport;
|
|
uint16_t th_dport;
|
|
} t_ports;
|
|
tcp_seq icmp_tcp_seq;
|
|
unsigned int mtu;
|
|
unsigned int off;
|
|
|
|
if (sa->sa_family != AF_INET6 ||
|
|
sa->sa_len != sizeof(struct sockaddr_in6))
|
|
return;
|
|
|
|
/* if the parameter is from icmp6, decode it. */
|
|
if (d != NULL) {
|
|
ip6cp = (struct ip6ctlparam *)d;
|
|
icmp6 = ip6cp->ip6c_icmp6;
|
|
m = ip6cp->ip6c_m;
|
|
ip6 = ip6cp->ip6c_ip6;
|
|
off = ip6cp->ip6c_off;
|
|
sa6_src = ip6cp->ip6c_src;
|
|
dst = ip6cp->ip6c_finaldst;
|
|
} else {
|
|
m = NULL;
|
|
ip6 = NULL;
|
|
off = 0; /* fool gcc */
|
|
sa6_src = &sa6_any;
|
|
dst = NULL;
|
|
}
|
|
|
|
if (cmd == PRC_MSGSIZE)
|
|
notify = tcp_mtudisc_notify;
|
|
else if (V_icmp_may_rst && (cmd == PRC_UNREACH_ADMIN_PROHIB ||
|
|
cmd == PRC_UNREACH_PORT || cmd == PRC_UNREACH_PROTOCOL ||
|
|
cmd == PRC_TIMXCEED_INTRANS) && ip6 != NULL)
|
|
notify = tcp_drop_syn_sent;
|
|
|
|
/*
|
|
* Hostdead is ugly because it goes linearly through all PCBs.
|
|
* XXX: We never get this from ICMP, otherwise it makes an
|
|
* excellent DoS attack on machines with many connections.
|
|
*/
|
|
else if (cmd == PRC_HOSTDEAD)
|
|
ip6 = NULL;
|
|
else if ((unsigned)cmd >= PRC_NCMDS || inet6ctlerrmap[cmd] == 0)
|
|
return;
|
|
|
|
if (ip6 == NULL) {
|
|
in6_pcbnotify(&V_tcbinfo, sa, 0,
|
|
(const struct sockaddr *)sa6_src,
|
|
0, cmd, NULL, notify);
|
|
return;
|
|
}
|
|
|
|
/* Check if we can safely get the ports from the tcp hdr */
|
|
if (m == NULL ||
|
|
(m->m_pkthdr.len <
|
|
(int32_t) (off + sizeof(struct tcp_ports)))) {
|
|
return;
|
|
}
|
|
bzero(&t_ports, sizeof(struct tcp_ports));
|
|
m_copydata(m, off, sizeof(struct tcp_ports), (caddr_t)&t_ports);
|
|
INP_INFO_RLOCK(&V_tcbinfo);
|
|
inp = in6_pcblookup(&V_tcbinfo, &ip6->ip6_dst, t_ports.th_dport,
|
|
&ip6->ip6_src, t_ports.th_sport, INPLOOKUP_WLOCKPCB, NULL);
|
|
if (inp != NULL && PRC_IS_REDIRECT(cmd)) {
|
|
/* signal EHOSTDOWN, as it flushes the cached route */
|
|
inp = (*notify)(inp, EHOSTDOWN);
|
|
goto out;
|
|
}
|
|
off += sizeof(struct tcp_ports);
|
|
if (m->m_pkthdr.len < (int32_t) (off + sizeof(tcp_seq))) {
|
|
goto out;
|
|
}
|
|
m_copydata(m, off, sizeof(tcp_seq), (caddr_t)&icmp_tcp_seq);
|
|
if (inp != NULL) {
|
|
if (!(inp->inp_flags & INP_TIMEWAIT) &&
|
|
!(inp->inp_flags & INP_DROPPED) &&
|
|
!(inp->inp_socket == NULL)) {
|
|
tp = intotcpcb(inp);
|
|
if (SEQ_GEQ(ntohl(icmp_tcp_seq), tp->snd_una) &&
|
|
SEQ_LT(ntohl(icmp_tcp_seq), tp->snd_max)) {
|
|
if (cmd == PRC_MSGSIZE) {
|
|
/*
|
|
* MTU discovery:
|
|
* If we got a needfrag set the MTU
|
|
* in the route to the suggested new
|
|
* value (if given) and then notify.
|
|
*/
|
|
mtu = ntohl(icmp6->icmp6_mtu);
|
|
/*
|
|
* If no alternative MTU was
|
|
* proposed, or the proposed
|
|
* MTU was too small, set to
|
|
* the min.
|
|
*/
|
|
if (mtu < IPV6_MMTU)
|
|
mtu = IPV6_MMTU - 8;
|
|
bzero(&inc, sizeof(inc));
|
|
inc.inc_fibnum = M_GETFIB(m);
|
|
inc.inc_flags |= INC_ISIPV6;
|
|
inc.inc6_faddr = *dst;
|
|
if (in6_setscope(&inc.inc6_faddr,
|
|
m->m_pkthdr.rcvif, NULL))
|
|
goto out;
|
|
/*
|
|
* Only process the offered MTU if it
|
|
* is smaller than the current one.
|
|
*/
|
|
if (mtu < tp->t_maxseg +
|
|
sizeof (struct tcphdr) +
|
|
sizeof (struct ip6_hdr)) {
|
|
tcp_hc_updatemtu(&inc, mtu);
|
|
tcp_mtudisc(inp, mtu);
|
|
ICMP6STAT_INC(icp6s_pmtuchg);
|
|
}
|
|
} else
|
|
inp = (*notify)(inp,
|
|
inet6ctlerrmap[cmd]);
|
|
}
|
|
}
|
|
} else {
|
|
bzero(&inc, sizeof(inc));
|
|
inc.inc_fibnum = M_GETFIB(m);
|
|
inc.inc_flags |= INC_ISIPV6;
|
|
inc.inc_fport = t_ports.th_dport;
|
|
inc.inc_lport = t_ports.th_sport;
|
|
inc.inc6_faddr = *dst;
|
|
inc.inc6_laddr = ip6->ip6_src;
|
|
syncache_unreach(&inc, icmp_tcp_seq);
|
|
}
|
|
out:
|
|
if (inp != NULL)
|
|
INP_WUNLOCK(inp);
|
|
INP_INFO_RUNLOCK(&V_tcbinfo);
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
|
|
/*
|
|
* Following is where TCP initial sequence number generation occurs.
|
|
*
|
|
* There are two places where we must use initial sequence numbers:
|
|
* 1. In SYN-ACK packets.
|
|
* 2. In SYN packets.
|
|
*
|
|
* All ISNs for SYN-ACK packets are generated by the syncache. See
|
|
* tcp_syncache.c for details.
|
|
*
|
|
* The ISNs in SYN packets must be monotonic; TIME_WAIT recycling
|
|
* depends on this property. In addition, these ISNs should be
|
|
* unguessable so as to prevent connection hijacking. To satisfy
|
|
* the requirements of this situation, the algorithm outlined in
|
|
* RFC 1948 is used, with only small modifications.
|
|
*
|
|
* Implementation details:
|
|
*
|
|
* Time is based off the system timer, and is corrected so that it
|
|
* increases by one megabyte per second. This allows for proper
|
|
* recycling on high speed LANs while still leaving over an hour
|
|
* before rollover.
|
|
*
|
|
* As reading the *exact* system time is too expensive to be done
|
|
* whenever setting up a TCP connection, we increment the time
|
|
* offset in two ways. First, a small random positive increment
|
|
* is added to isn_offset for each connection that is set up.
|
|
* Second, the function tcp_isn_tick fires once per clock tick
|
|
* and increments isn_offset as necessary so that sequence numbers
|
|
* are incremented at approximately ISN_BYTES_PER_SECOND. The
|
|
* random positive increments serve only to ensure that the same
|
|
* exact sequence number is never sent out twice (as could otherwise
|
|
* happen when a port is recycled in less than the system tick
|
|
* interval.)
|
|
*
|
|
* net.inet.tcp.isn_reseed_interval controls the number of seconds
|
|
* between seeding of isn_secret. This is normally set to zero,
|
|
* as reseeding should not be necessary.
|
|
*
|
|
* Locking of the global variables isn_secret, isn_last_reseed, isn_offset,
|
|
* isn_offset_old, and isn_ctx is performed using the TCP pcbinfo lock. In
|
|
* general, this means holding an exclusive (write) lock.
|
|
*/
|
|
|
|
#define ISN_BYTES_PER_SECOND 1048576
|
|
#define ISN_STATIC_INCREMENT 4096
|
|
#define ISN_RANDOM_INCREMENT (4096 - 1)
|
|
|
|
static VNET_DEFINE(u_char, isn_secret[32]);
|
|
static VNET_DEFINE(int, isn_last);
|
|
static VNET_DEFINE(int, isn_last_reseed);
|
|
static VNET_DEFINE(u_int32_t, isn_offset);
|
|
static VNET_DEFINE(u_int32_t, isn_offset_old);
|
|
|
|
#define V_isn_secret VNET(isn_secret)
|
|
#define V_isn_last VNET(isn_last)
|
|
#define V_isn_last_reseed VNET(isn_last_reseed)
|
|
#define V_isn_offset VNET(isn_offset)
|
|
#define V_isn_offset_old VNET(isn_offset_old)
|
|
|
|
tcp_seq
|
|
tcp_new_isn(struct tcpcb *tp)
|
|
{
|
|
MD5_CTX isn_ctx;
|
|
u_int32_t md5_buffer[4];
|
|
tcp_seq new_isn;
|
|
u_int32_t projected_offset;
|
|
|
|
INP_WLOCK_ASSERT(tp->t_inpcb);
|
|
|
|
ISN_LOCK();
|
|
/* Seed if this is the first use, reseed if requested. */
|
|
if ((V_isn_last_reseed == 0) || ((V_tcp_isn_reseed_interval > 0) &&
|
|
(((u_int)V_isn_last_reseed + (u_int)V_tcp_isn_reseed_interval*hz)
|
|
< (u_int)ticks))) {
|
|
read_random(&V_isn_secret, sizeof(V_isn_secret));
|
|
V_isn_last_reseed = ticks;
|
|
}
|
|
|
|
/* Compute the md5 hash and return the ISN. */
|
|
MD5Init(&isn_ctx);
|
|
MD5Update(&isn_ctx, (u_char *) &tp->t_inpcb->inp_fport, sizeof(u_short));
|
|
MD5Update(&isn_ctx, (u_char *) &tp->t_inpcb->inp_lport, sizeof(u_short));
|
|
#ifdef INET6
|
|
if ((tp->t_inpcb->inp_vflag & INP_IPV6) != 0) {
|
|
MD5Update(&isn_ctx, (u_char *) &tp->t_inpcb->in6p_faddr,
|
|
sizeof(struct in6_addr));
|
|
MD5Update(&isn_ctx, (u_char *) &tp->t_inpcb->in6p_laddr,
|
|
sizeof(struct in6_addr));
|
|
} else
|
|
#endif
|
|
{
|
|
MD5Update(&isn_ctx, (u_char *) &tp->t_inpcb->inp_faddr,
|
|
sizeof(struct in_addr));
|
|
MD5Update(&isn_ctx, (u_char *) &tp->t_inpcb->inp_laddr,
|
|
sizeof(struct in_addr));
|
|
}
|
|
MD5Update(&isn_ctx, (u_char *) &V_isn_secret, sizeof(V_isn_secret));
|
|
MD5Final((u_char *) &md5_buffer, &isn_ctx);
|
|
new_isn = (tcp_seq) md5_buffer[0];
|
|
V_isn_offset += ISN_STATIC_INCREMENT +
|
|
(arc4random() & ISN_RANDOM_INCREMENT);
|
|
if (ticks != V_isn_last) {
|
|
projected_offset = V_isn_offset_old +
|
|
ISN_BYTES_PER_SECOND / hz * (ticks - V_isn_last);
|
|
if (SEQ_GT(projected_offset, V_isn_offset))
|
|
V_isn_offset = projected_offset;
|
|
V_isn_offset_old = V_isn_offset;
|
|
V_isn_last = ticks;
|
|
}
|
|
new_isn += V_isn_offset;
|
|
ISN_UNLOCK();
|
|
return (new_isn);
|
|
}
|
|
|
|
/*
|
|
* When a specific ICMP unreachable message is received and the
|
|
* connection state is SYN-SENT, drop the connection. This behavior
|
|
* is controlled by the icmp_may_rst sysctl.
|
|
*/
|
|
struct inpcb *
|
|
tcp_drop_syn_sent(struct inpcb *inp, int errno)
|
|
{
|
|
struct tcpcb *tp;
|
|
|
|
INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
|
|
INP_WLOCK_ASSERT(inp);
|
|
|
|
if ((inp->inp_flags & INP_TIMEWAIT) ||
|
|
(inp->inp_flags & INP_DROPPED))
|
|
return (inp);
|
|
|
|
tp = intotcpcb(inp);
|
|
if (tp->t_state != TCPS_SYN_SENT)
|
|
return (inp);
|
|
|
|
if (IS_FASTOPEN(tp->t_flags))
|
|
tcp_fastopen_disable_path(tp);
|
|
|
|
tp = tcp_drop(tp, errno);
|
|
if (tp != NULL)
|
|
return (inp);
|
|
else
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* When `need fragmentation' ICMP is received, update our idea of the MSS
|
|
* based on the new value. Also nudge TCP to send something, since we
|
|
* know the packet we just sent was dropped.
|
|
* This duplicates some code in the tcp_mss() function in tcp_input.c.
|
|
*/
|
|
static struct inpcb *
|
|
tcp_mtudisc_notify(struct inpcb *inp, int error)
|
|
{
|
|
|
|
tcp_mtudisc(inp, -1);
|
|
return (inp);
|
|
}
|
|
|
|
static void
|
|
tcp_mtudisc(struct inpcb *inp, int mtuoffer)
|
|
{
|
|
struct tcpcb *tp;
|
|
struct socket *so;
|
|
|
|
INP_WLOCK_ASSERT(inp);
|
|
if ((inp->inp_flags & INP_TIMEWAIT) ||
|
|
(inp->inp_flags & INP_DROPPED))
|
|
return;
|
|
|
|
tp = intotcpcb(inp);
|
|
KASSERT(tp != NULL, ("tcp_mtudisc: tp == NULL"));
|
|
|
|
tcp_mss_update(tp, -1, mtuoffer, NULL, NULL);
|
|
|
|
so = inp->inp_socket;
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
/* If the mss is larger than the socket buffer, decrease the mss. */
|
|
if (so->so_snd.sb_hiwat < tp->t_maxseg)
|
|
tp->t_maxseg = so->so_snd.sb_hiwat;
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
|
|
TCPSTAT_INC(tcps_mturesent);
|
|
tp->t_rtttime = 0;
|
|
tp->snd_nxt = tp->snd_una;
|
|
tcp_free_sackholes(tp);
|
|
tp->snd_recover = tp->snd_max;
|
|
if (tp->t_flags & TF_SACK_PERMIT)
|
|
EXIT_FASTRECOVERY(tp->t_flags);
|
|
tp->t_fb->tfb_tcp_output(tp);
|
|
}
|
|
|
|
#ifdef INET
|
|
/*
|
|
* Look-up the routing entry to the peer of this inpcb. If no route
|
|
* is found and it cannot be allocated, then return 0. This routine
|
|
* is called by TCP routines that access the rmx structure and by
|
|
* tcp_mss_update to get the peer/interface MTU.
|
|
*/
|
|
uint32_t
|
|
tcp_maxmtu(struct in_conninfo *inc, struct tcp_ifcap *cap)
|
|
{
|
|
struct nhop4_extended nh4;
|
|
struct ifnet *ifp;
|
|
uint32_t maxmtu = 0;
|
|
|
|
KASSERT(inc != NULL, ("tcp_maxmtu with NULL in_conninfo pointer"));
|
|
|
|
if (inc->inc_faddr.s_addr != INADDR_ANY) {
|
|
|
|
if (fib4_lookup_nh_ext(inc->inc_fibnum, inc->inc_faddr,
|
|
NHR_REF, 0, &nh4) != 0)
|
|
return (0);
|
|
|
|
ifp = nh4.nh_ifp;
|
|
maxmtu = nh4.nh_mtu;
|
|
|
|
/* Report additional interface capabilities. */
|
|
if (cap != NULL) {
|
|
if (ifp->if_capenable & IFCAP_TSO4 &&
|
|
ifp->if_hwassist & CSUM_TSO) {
|
|
cap->ifcap |= CSUM_TSO;
|
|
cap->tsomax = ifp->if_hw_tsomax;
|
|
cap->tsomaxsegcount = ifp->if_hw_tsomaxsegcount;
|
|
cap->tsomaxsegsize = ifp->if_hw_tsomaxsegsize;
|
|
}
|
|
}
|
|
fib4_free_nh_ext(inc->inc_fibnum, &nh4);
|
|
}
|
|
return (maxmtu);
|
|
}
|
|
#endif /* INET */
|
|
|
|
#ifdef INET6
|
|
uint32_t
|
|
tcp_maxmtu6(struct in_conninfo *inc, struct tcp_ifcap *cap)
|
|
{
|
|
struct nhop6_extended nh6;
|
|
struct in6_addr dst6;
|
|
uint32_t scopeid;
|
|
struct ifnet *ifp;
|
|
uint32_t maxmtu = 0;
|
|
|
|
KASSERT(inc != NULL, ("tcp_maxmtu6 with NULL in_conninfo pointer"));
|
|
|
|
if (!IN6_IS_ADDR_UNSPECIFIED(&inc->inc6_faddr)) {
|
|
in6_splitscope(&inc->inc6_faddr, &dst6, &scopeid);
|
|
if (fib6_lookup_nh_ext(inc->inc_fibnum, &dst6, scopeid, 0,
|
|
0, &nh6) != 0)
|
|
return (0);
|
|
|
|
ifp = nh6.nh_ifp;
|
|
maxmtu = nh6.nh_mtu;
|
|
|
|
/* Report additional interface capabilities. */
|
|
if (cap != NULL) {
|
|
if (ifp->if_capenable & IFCAP_TSO6 &&
|
|
ifp->if_hwassist & CSUM_TSO) {
|
|
cap->ifcap |= CSUM_TSO;
|
|
cap->tsomax = ifp->if_hw_tsomax;
|
|
cap->tsomaxsegcount = ifp->if_hw_tsomaxsegcount;
|
|
cap->tsomaxsegsize = ifp->if_hw_tsomaxsegsize;
|
|
}
|
|
}
|
|
fib6_free_nh_ext(inc->inc_fibnum, &nh6);
|
|
}
|
|
|
|
return (maxmtu);
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
/*
|
|
* Calculate effective SMSS per RFC5681 definition for a given TCP
|
|
* connection at its current state, taking into account SACK and etc.
|
|
*/
|
|
u_int
|
|
tcp_maxseg(const struct tcpcb *tp)
|
|
{
|
|
u_int optlen;
|
|
|
|
if (tp->t_flags & TF_NOOPT)
|
|
return (tp->t_maxseg);
|
|
|
|
/*
|
|
* Here we have a simplified code from tcp_addoptions(),
|
|
* without a proper loop, and having most of paddings hardcoded.
|
|
* We might make mistakes with padding here in some edge cases,
|
|
* but this is harmless, since result of tcp_maxseg() is used
|
|
* only in cwnd and ssthresh estimations.
|
|
*/
|
|
#define PAD(len) ((((len) / 4) + !!((len) % 4)) * 4)
|
|
if (TCPS_HAVEESTABLISHED(tp->t_state)) {
|
|
if (tp->t_flags & TF_RCVD_TSTMP)
|
|
optlen = TCPOLEN_TSTAMP_APPA;
|
|
else
|
|
optlen = 0;
|
|
#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
|
|
if (tp->t_flags & TF_SIGNATURE)
|
|
optlen += PAD(TCPOLEN_SIGNATURE);
|
|
#endif
|
|
if ((tp->t_flags & TF_SACK_PERMIT) && tp->rcv_numsacks > 0) {
|
|
optlen += TCPOLEN_SACKHDR;
|
|
optlen += tp->rcv_numsacks * TCPOLEN_SACK;
|
|
optlen = PAD(optlen);
|
|
}
|
|
} else {
|
|
if (tp->t_flags & TF_REQ_TSTMP)
|
|
optlen = TCPOLEN_TSTAMP_APPA;
|
|
else
|
|
optlen = PAD(TCPOLEN_MAXSEG);
|
|
if (tp->t_flags & TF_REQ_SCALE)
|
|
optlen += PAD(TCPOLEN_WINDOW);
|
|
#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
|
|
if (tp->t_flags & TF_SIGNATURE)
|
|
optlen += PAD(TCPOLEN_SIGNATURE);
|
|
#endif
|
|
if (tp->t_flags & TF_SACK_PERMIT)
|
|
optlen += PAD(TCPOLEN_SACK_PERMITTED);
|
|
}
|
|
#undef PAD
|
|
optlen = min(optlen, TCP_MAXOLEN);
|
|
return (tp->t_maxseg - optlen);
|
|
}
|
|
|
|
static int
|
|
sysctl_drop(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
/* addrs[0] is a foreign socket, addrs[1] is a local one. */
|
|
struct sockaddr_storage addrs[2];
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
struct tcptw *tw;
|
|
struct sockaddr_in *fin, *lin;
|
|
#ifdef INET6
|
|
struct sockaddr_in6 *fin6, *lin6;
|
|
#endif
|
|
int error;
|
|
|
|
inp = NULL;
|
|
fin = lin = NULL;
|
|
#ifdef INET6
|
|
fin6 = lin6 = NULL;
|
|
#endif
|
|
error = 0;
|
|
|
|
if (req->oldptr != NULL || req->oldlen != 0)
|
|
return (EINVAL);
|
|
if (req->newptr == NULL)
|
|
return (EPERM);
|
|
if (req->newlen < sizeof(addrs))
|
|
return (ENOMEM);
|
|
error = SYSCTL_IN(req, &addrs, sizeof(addrs));
|
|
if (error)
|
|
return (error);
|
|
|
|
switch (addrs[0].ss_family) {
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
fin6 = (struct sockaddr_in6 *)&addrs[0];
|
|
lin6 = (struct sockaddr_in6 *)&addrs[1];
|
|
if (fin6->sin6_len != sizeof(struct sockaddr_in6) ||
|
|
lin6->sin6_len != sizeof(struct sockaddr_in6))
|
|
return (EINVAL);
|
|
if (IN6_IS_ADDR_V4MAPPED(&fin6->sin6_addr)) {
|
|
if (!IN6_IS_ADDR_V4MAPPED(&lin6->sin6_addr))
|
|
return (EINVAL);
|
|
in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[0]);
|
|
in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[1]);
|
|
fin = (struct sockaddr_in *)&addrs[0];
|
|
lin = (struct sockaddr_in *)&addrs[1];
|
|
break;
|
|
}
|
|
error = sa6_embedscope(fin6, V_ip6_use_defzone);
|
|
if (error)
|
|
return (error);
|
|
error = sa6_embedscope(lin6, V_ip6_use_defzone);
|
|
if (error)
|
|
return (error);
|
|
break;
|
|
#endif
|
|
#ifdef INET
|
|
case AF_INET:
|
|
fin = (struct sockaddr_in *)&addrs[0];
|
|
lin = (struct sockaddr_in *)&addrs[1];
|
|
if (fin->sin_len != sizeof(struct sockaddr_in) ||
|
|
lin->sin_len != sizeof(struct sockaddr_in))
|
|
return (EINVAL);
|
|
break;
|
|
#endif
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
INP_INFO_RLOCK(&V_tcbinfo);
|
|
switch (addrs[0].ss_family) {
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
inp = in6_pcblookup(&V_tcbinfo, &fin6->sin6_addr,
|
|
fin6->sin6_port, &lin6->sin6_addr, lin6->sin6_port,
|
|
INPLOOKUP_WLOCKPCB, NULL);
|
|
break;
|
|
#endif
|
|
#ifdef INET
|
|
case AF_INET:
|
|
inp = in_pcblookup(&V_tcbinfo, fin->sin_addr, fin->sin_port,
|
|
lin->sin_addr, lin->sin_port, INPLOOKUP_WLOCKPCB, NULL);
|
|
break;
|
|
#endif
|
|
}
|
|
if (inp != NULL) {
|
|
if (inp->inp_flags & INP_TIMEWAIT) {
|
|
/*
|
|
* XXXRW: There currently exists a state where an
|
|
* inpcb is present, but its timewait state has been
|
|
* discarded. For now, don't allow dropping of this
|
|
* type of inpcb.
|
|
*/
|
|
tw = intotw(inp);
|
|
if (tw != NULL)
|
|
tcp_twclose(tw, 0);
|
|
else
|
|
INP_WUNLOCK(inp);
|
|
} else if (!(inp->inp_flags & INP_DROPPED) &&
|
|
!(inp->inp_socket->so_options & SO_ACCEPTCONN)) {
|
|
tp = intotcpcb(inp);
|
|
tp = tcp_drop(tp, ECONNABORTED);
|
|
if (tp != NULL)
|
|
INP_WUNLOCK(inp);
|
|
} else
|
|
INP_WUNLOCK(inp);
|
|
} else
|
|
error = ESRCH;
|
|
INP_INFO_RUNLOCK(&V_tcbinfo);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_net_inet_tcp, TCPCTL_DROP, drop,
|
|
CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_WR | CTLFLAG_SKIP, NULL,
|
|
0, sysctl_drop, "", "Drop TCP connection");
|
|
|
|
/*
|
|
* Generate a standardized TCP log line for use throughout the
|
|
* tcp subsystem. Memory allocation is done with M_NOWAIT to
|
|
* allow use in the interrupt context.
|
|
*
|
|
* NB: The caller MUST free(s, M_TCPLOG) the returned string.
|
|
* NB: The function may return NULL if memory allocation failed.
|
|
*
|
|
* Due to header inclusion and ordering limitations the struct ip
|
|
* and ip6_hdr pointers have to be passed as void pointers.
|
|
*/
|
|
char *
|
|
tcp_log_vain(struct in_conninfo *inc, struct tcphdr *th, void *ip4hdr,
|
|
const void *ip6hdr)
|
|
{
|
|
|
|
/* Is logging enabled? */
|
|
if (tcp_log_in_vain == 0)
|
|
return (NULL);
|
|
|
|
return (tcp_log_addr(inc, th, ip4hdr, ip6hdr));
|
|
}
|
|
|
|
char *
|
|
tcp_log_addrs(struct in_conninfo *inc, struct tcphdr *th, void *ip4hdr,
|
|
const void *ip6hdr)
|
|
{
|
|
|
|
/* Is logging enabled? */
|
|
if (tcp_log_debug == 0)
|
|
return (NULL);
|
|
|
|
return (tcp_log_addr(inc, th, ip4hdr, ip6hdr));
|
|
}
|
|
|
|
static char *
|
|
tcp_log_addr(struct in_conninfo *inc, struct tcphdr *th, void *ip4hdr,
|
|
const void *ip6hdr)
|
|
{
|
|
char *s, *sp;
|
|
size_t size;
|
|
struct ip *ip;
|
|
#ifdef INET6
|
|
const struct ip6_hdr *ip6;
|
|
|
|
ip6 = (const struct ip6_hdr *)ip6hdr;
|
|
#endif /* INET6 */
|
|
ip = (struct ip *)ip4hdr;
|
|
|
|
/*
|
|
* The log line looks like this:
|
|
* "TCP: [1.2.3.4]:50332 to [1.2.3.4]:80 tcpflags 0x2<SYN>"
|
|
*/
|
|
size = sizeof("TCP: []:12345 to []:12345 tcpflags 0x2<>") +
|
|
sizeof(PRINT_TH_FLAGS) + 1 +
|
|
#ifdef INET6
|
|
2 * INET6_ADDRSTRLEN;
|
|
#else
|
|
2 * INET_ADDRSTRLEN;
|
|
#endif /* INET6 */
|
|
|
|
s = malloc(size, M_TCPLOG, M_ZERO|M_NOWAIT);
|
|
if (s == NULL)
|
|
return (NULL);
|
|
|
|
strcat(s, "TCP: [");
|
|
sp = s + strlen(s);
|
|
|
|
if (inc && ((inc->inc_flags & INC_ISIPV6) == 0)) {
|
|
inet_ntoa_r(inc->inc_faddr, sp);
|
|
sp = s + strlen(s);
|
|
sprintf(sp, "]:%i to [", ntohs(inc->inc_fport));
|
|
sp = s + strlen(s);
|
|
inet_ntoa_r(inc->inc_laddr, sp);
|
|
sp = s + strlen(s);
|
|
sprintf(sp, "]:%i", ntohs(inc->inc_lport));
|
|
#ifdef INET6
|
|
} else if (inc) {
|
|
ip6_sprintf(sp, &inc->inc6_faddr);
|
|
sp = s + strlen(s);
|
|
sprintf(sp, "]:%i to [", ntohs(inc->inc_fport));
|
|
sp = s + strlen(s);
|
|
ip6_sprintf(sp, &inc->inc6_laddr);
|
|
sp = s + strlen(s);
|
|
sprintf(sp, "]:%i", ntohs(inc->inc_lport));
|
|
} else if (ip6 && th) {
|
|
ip6_sprintf(sp, &ip6->ip6_src);
|
|
sp = s + strlen(s);
|
|
sprintf(sp, "]:%i to [", ntohs(th->th_sport));
|
|
sp = s + strlen(s);
|
|
ip6_sprintf(sp, &ip6->ip6_dst);
|
|
sp = s + strlen(s);
|
|
sprintf(sp, "]:%i", ntohs(th->th_dport));
|
|
#endif /* INET6 */
|
|
#ifdef INET
|
|
} else if (ip && th) {
|
|
inet_ntoa_r(ip->ip_src, sp);
|
|
sp = s + strlen(s);
|
|
sprintf(sp, "]:%i to [", ntohs(th->th_sport));
|
|
sp = s + strlen(s);
|
|
inet_ntoa_r(ip->ip_dst, sp);
|
|
sp = s + strlen(s);
|
|
sprintf(sp, "]:%i", ntohs(th->th_dport));
|
|
#endif /* INET */
|
|
} else {
|
|
free(s, M_TCPLOG);
|
|
return (NULL);
|
|
}
|
|
sp = s + strlen(s);
|
|
if (th)
|
|
sprintf(sp, " tcpflags 0x%b", th->th_flags, PRINT_TH_FLAGS);
|
|
if (*(s + size - 1) != '\0')
|
|
panic("%s: string too long", __func__);
|
|
return (s);
|
|
}
|
|
|
|
/*
|
|
* A subroutine which makes it easy to track TCP state changes with DTrace.
|
|
* This function shouldn't be called for t_state initializations that don't
|
|
* correspond to actual TCP state transitions.
|
|
*/
|
|
void
|
|
tcp_state_change(struct tcpcb *tp, int newstate)
|
|
{
|
|
#if defined(KDTRACE_HOOKS)
|
|
int pstate = tp->t_state;
|
|
#endif
|
|
|
|
TCPSTATES_DEC(tp->t_state);
|
|
TCPSTATES_INC(newstate);
|
|
tp->t_state = newstate;
|
|
TCP_PROBE6(state__change, NULL, tp, NULL, tp, NULL, pstate);
|
|
}
|
|
|
|
/*
|
|
* Create an external-format (``xtcpcb'') structure using the information in
|
|
* the kernel-format tcpcb structure pointed to by tp. This is done to
|
|
* reduce the spew of irrelevant information over this interface, to isolate
|
|
* user code from changes in the kernel structure, and potentially to provide
|
|
* information-hiding if we decide that some of this information should be
|
|
* hidden from users.
|
|
*/
|
|
void
|
|
tcp_inptoxtp(const struct inpcb *inp, struct xtcpcb *xt)
|
|
{
|
|
struct tcpcb *tp = intotcpcb(inp);
|
|
sbintime_t now;
|
|
|
|
if (inp->inp_flags & INP_TIMEWAIT) {
|
|
bzero(xt, sizeof(struct xtcpcb));
|
|
xt->t_state = TCPS_TIME_WAIT;
|
|
} else {
|
|
xt->t_state = tp->t_state;
|
|
xt->t_logstate = tp->t_logstate;
|
|
xt->t_flags = tp->t_flags;
|
|
xt->t_sndzerowin = tp->t_sndzerowin;
|
|
xt->t_sndrexmitpack = tp->t_sndrexmitpack;
|
|
xt->t_rcvoopack = tp->t_rcvoopack;
|
|
|
|
now = getsbinuptime();
|
|
#define COPYTIMER(ttt) do { \
|
|
if (callout_active(&tp->t_timers->ttt)) \
|
|
xt->ttt = (tp->t_timers->ttt.c_time - now) / \
|
|
SBT_1MS; \
|
|
else \
|
|
xt->ttt = 0; \
|
|
} while (0)
|
|
COPYTIMER(tt_delack);
|
|
COPYTIMER(tt_rexmt);
|
|
COPYTIMER(tt_persist);
|
|
COPYTIMER(tt_keep);
|
|
COPYTIMER(tt_2msl);
|
|
#undef COPYTIMER
|
|
xt->t_rcvtime = 1000 * (ticks - tp->t_rcvtime) / hz;
|
|
|
|
bcopy(tp->t_fb->tfb_tcp_block_name, xt->xt_stack,
|
|
TCP_FUNCTION_NAME_LEN_MAX);
|
|
bzero(xt->xt_logid, TCP_LOG_ID_LEN);
|
|
#ifdef TCP_BLACKBOX
|
|
(void)tcp_log_get_id(tp, xt->xt_logid);
|
|
#endif
|
|
}
|
|
|
|
xt->xt_len = sizeof(struct xtcpcb);
|
|
in_pcbtoxinpcb(inp, &xt->xt_inp);
|
|
if (inp->inp_socket == NULL)
|
|
xt->xt_inp.xi_socket.xso_protocol = IPPROTO_TCP;
|
|
}
|