2cd33a0ce1
where one side can think a connection exists, where the other side thinks the connection was never established. The original problem was first reported by Ty Sarna in PR #5909. The original fix I made to the code didn't cover all cases. The problem this fix addresses was reported by Christoph Badura via private e-mail. Many thanks to Bill Sommerfeld for helping me to test this code, and for finding a subtle bug.
192 lines
5.8 KiB
C
192 lines
5.8 KiB
C
/* $NetBSD: in_proto.c,v 1.30 1999/04/29 03:54:22 thorpej Exp $ */
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/*
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* Copyright (c) 1982, 1986, 1993
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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* @(#)in_proto.c 8.2 (Berkeley) 2/9/95
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*/
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#include "opt_mrouting.h"
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#include "opt_eon.h" /* ISO CLNL over IP */
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#include "opt_iso.h" /* ISO TP tunneled over IP */
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#include "opt_ns.h" /* NSIP: XNS tunneled over IP */
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/protosw.h>
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#include <sys/domain.h>
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#include <sys/mbuf.h>
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#include <net/if.h>
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#include <net/radix.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/in_pcb.h>
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#include <netinet/igmp_var.h>
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#include <netinet/tcp.h>
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#include <netinet/tcp_fsm.h>
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#include <netinet/tcp_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/tcpip.h>
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#include <netinet/tcp_debug.h>
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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/*
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* TCP/IP protocol family: IP, ICMP, UDP, TCP.
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*/
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#ifdef NSIP
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#include <netns/ns_var.h>
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#include <netns/idp_var.h>
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#endif /* NSIP */
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#ifdef TPIP
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#include <netiso/tp_param.h>
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#include <netiso/tp_var.h>
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#endif /* TPIP */
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#ifdef EON
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#include <netiso/eonvar.h>
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#endif /* EON */
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#include "ipip.h"
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#if NIPIP > 0 || defined(MROUTING)
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#include <netinet/ip_ipip.h>
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#endif /* NIPIP > 0 || MROUTING */
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#include "gre.h"
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#if NGRE > 0
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#include <netinet/ip_gre.h>
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#endif
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extern struct domain inetdomain;
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struct protosw inetsw[] = {
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{ 0, &inetdomain, 0, 0,
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0, ip_output, 0, 0,
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0,
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ip_init, 0, ip_slowtimo, ip_drain, ip_sysctl
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},
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{ SOCK_DGRAM, &inetdomain, IPPROTO_UDP, PR_ATOMIC|PR_ADDR,
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udp_input, 0, udp_ctlinput, ip_ctloutput,
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udp_usrreq,
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udp_init, 0, 0, 0, udp_sysctl
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},
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{ SOCK_STREAM, &inetdomain, IPPROTO_TCP, PR_CONNREQUIRED|PR_WANTRCVD,
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tcp_input, 0, tcp_ctlinput, tcp_ctloutput,
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tcp_usrreq,
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tcp_init, tcp_fasttimo, tcp_slowtimo, tcp_drain, tcp_sysctl
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},
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{ SOCK_RAW, &inetdomain, IPPROTO_RAW, PR_ATOMIC|PR_ADDR,
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rip_input, rip_output, 0, rip_ctloutput,
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rip_usrreq,
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0, 0, 0, 0,
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},
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{ SOCK_RAW, &inetdomain, IPPROTO_ICMP, PR_ATOMIC|PR_ADDR,
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icmp_input, rip_output, 0, rip_ctloutput,
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rip_usrreq,
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0, 0, 0, 0, icmp_sysctl
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},
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#if NIPIP > 0 || defined(MROUTING)
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{ SOCK_RAW, &inetdomain, IPPROTO_IPIP, PR_ATOMIC|PR_ADDR,
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ipip_input, rip_output, 0, rip_ctloutput,
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rip_usrreq, /* XXX */
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0, 0, 0, 0,
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},
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#endif /* NIPIP > 0 || MROUTING */
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#if NGRE > 0
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{ SOCK_RAW, &inetdomain, IPPROTO_GRE, PR_ATOMIC|PR_ADDR,
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gre_input, rip_output, 0, rip_ctloutput,
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rip_usrreq,
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0, 0, 0, 0,
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},
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{ SOCK_RAW, &inetdomain, IPPROTO_MOBILE, PR_ATOMIC|PR_ADDR,
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gre_mobile_input, rip_output, 0, rip_ctloutput,
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rip_usrreq,
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0, 0, 0, 0,
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},
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#endif /* NGRE > 0 */
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{ SOCK_RAW, &inetdomain, IPPROTO_IGMP, PR_ATOMIC|PR_ADDR,
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igmp_input, rip_output, 0, rip_ctloutput,
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rip_usrreq,
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igmp_init, igmp_fasttimo, igmp_slowtimo, 0,
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},
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#ifdef TPIP
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{ SOCK_SEQPACKET,&inetdomain, IPPROTO_TP, PR_CONNREQUIRED|PR_WANTRCVD,
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tpip_input, 0, tpip_ctlinput, tp_ctloutput,
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tp_usrreq,
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tp_init, 0, tp_slowtimo, tp_drain,
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},
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#endif /* TPIP */
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/* EON (ISO CLNL over IP) */
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#ifdef EON
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{ SOCK_RAW, &inetdomain, IPPROTO_EON, 0,
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eoninput, 0, eonctlinput, 0,
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0,
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eonprotoinit, 0, 0, 0,
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},
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#endif /* EON */
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#ifdef NSIP
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{ SOCK_RAW, &inetdomain, IPPROTO_IDP, PR_ATOMIC|PR_ADDR,
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idpip_input, NULL, nsip_ctlinput, 0,
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rip_usrreq,
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0, 0, 0, 0,
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},
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#endif /* NSIP */
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/* raw wildcard */
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{ SOCK_RAW, &inetdomain, 0, PR_ATOMIC|PR_ADDR,
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rip_input, rip_output, 0, rip_ctloutput,
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rip_usrreq,
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rip_init, 0, 0, 0,
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},
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};
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struct domain inetdomain =
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{ PF_INET, "internet", 0, 0, 0,
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inetsw, &inetsw[sizeof(inetsw)/sizeof(inetsw[0])], 0,
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rn_inithead, 32, sizeof(struct sockaddr_in) };
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#define TCP_SYN_HASH_SIZE 293
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#define TCP_SYN_BUCKET_SIZE 35
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int tcp_syn_cache_size = TCP_SYN_HASH_SIZE;
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int tcp_syn_cache_limit = TCP_SYN_HASH_SIZE*TCP_SYN_BUCKET_SIZE;
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int tcp_syn_bucket_limit = 3*TCP_SYN_BUCKET_SIZE;
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struct syn_cache_head tcp_syn_cache[TCP_SYN_HASH_SIZE];
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int tcp_syn_cache_interval = 1; /* runs timer twice a second */
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