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NetBSD/sys/netinet/in_proto.c
thorpej ea9b5a9106 Restructure the Path MTU Discovery code somewhat to avoid 
entering rtentry's for hosts we're not actually communicating
with.

Do this by invoking the ctlinput for the protocol, which is
responsible for validating the ICMP message:
	* TCP -- Lookup the connection based on the address/port
	  pairs in the ICMP message.
	* AH/ESP -- Lookup the SA based on the SPI in the ICMP message.

If validation succeeds, ctlinput is responsible for calling
icmp_mtudisc().  icmp_mtudisc() then invokes callbacks registered
by protocols (such as TCP) which want to take some sort of special
action when a path's MTU changes.  For TCP, this is where we now
refresh cached routes and re-enter slow-start.

As a side-effect, this fixes the problem where TCP would not be
notified when a path's MTU changed if AH/ESP were being used.

XXX Note, this is only a fix for the IPv4 case.  For the IPv6
XXX case, we need to wait for the KAME folks.

Reviewed by sommerfeld@netbsd.org and itojun@netbsd.org.
2000-10-18 17:09:14 +00:00

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/* $NetBSD: in_proto.c,v 1.44 2000/10/18 17:09:14 thorpej Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Copyright (c) 1982, 1986, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)in_proto.c 8.2 (Berkeley) 2/9/95
*/
#include "opt_mrouting.h"
#include "opt_eon.h" /* ISO CLNL over IP */
#include "opt_iso.h" /* ISO TP tunneled over IP */
#include "opt_ns.h" /* NSIP: XNS tunneled over IP */
#include "opt_inet.h"
#include "opt_ipsec.h"
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/domain.h>
#include <sys/mbuf.h>
#include <net/if.h>
#include <net/radix.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/ip_icmp.h>
#include <netinet/in_pcb.h>
#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet/ip6.h>
#endif
#include <netinet/igmp_var.h>
#include <netinet/tcp.h>
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_seq.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/tcpip.h>
#include <netinet/tcp_debug.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/ip_encap.h>
/*
* TCP/IP protocol family: IP, ICMP, UDP, TCP.
*/
#ifdef IPSEC
#include <netinet6/ah.h>
#ifdef IPSEC_ESP
#include <netinet6/esp.h>
#endif
#include <netinet6/ipcomp.h>
#endif /* IPSEC */
#include "gif.h"
#if NGIF > 0
#include <netinet/in_gif.h>
#endif
#ifdef NSIP
#include <netns/ns_var.h>
#include <netns/idp_var.h>
#endif /* NSIP */
#ifdef TPIP
#include <netiso/tp_param.h>
#include <netiso/tp_var.h>
#endif /* TPIP */
#ifdef EON
#include <netiso/eonvar.h>
#endif /* EON */
#include "ipip.h"
#if NIPIP > 0 || defined(MROUTING)
#include <netinet/ip_ipip.h>
#endif /* NIPIP > 0 || MROUTING */
#include "gre.h"
#if NGRE > 0
#include <netinet/ip_gre.h>
#endif
#include "stf.h"
#if NSTF > 0
#include <net/if_stf.h>
#endif
extern struct domain inetdomain;
struct protosw inetsw[] = {
{ 0, &inetdomain, 0, 0,
0, ip_output, 0, 0,
0,
ip_init, 0, ip_slowtimo, ip_drain, ip_sysctl
},
{ SOCK_DGRAM, &inetdomain, IPPROTO_UDP, PR_ATOMIC|PR_ADDR,
udp_input, 0, udp_ctlinput, ip_ctloutput,
udp_usrreq,
udp_init, 0, 0, 0, udp_sysctl
},
{ SOCK_STREAM, &inetdomain, IPPROTO_TCP, PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN,
tcp_input, 0, tcp_ctlinput, tcp_ctloutput,
tcp_usrreq,
tcp_init, tcp_fasttimo, tcp_slowtimo, tcp_drain, tcp_sysctl
},
{ SOCK_RAW, &inetdomain, IPPROTO_RAW, PR_ATOMIC|PR_ADDR,
rip_input, rip_output, 0, rip_ctloutput,
rip_usrreq,
0, 0, 0, 0,
},
{ SOCK_RAW, &inetdomain, IPPROTO_ICMP, PR_ATOMIC|PR_ADDR,
icmp_input, rip_output, 0, rip_ctloutput,
rip_usrreq,
0, 0, 0, 0, icmp_sysctl
},
#ifdef IPSEC
{ SOCK_RAW, &inetdomain, IPPROTO_AH, PR_ATOMIC|PR_ADDR,
ah4_input, 0, ah4_ctlinput, 0,
0,
0, 0, 0, 0, ipsec_sysctl
},
#ifdef IPSEC_ESP
{ SOCK_RAW, &inetdomain, IPPROTO_ESP, PR_ATOMIC|PR_ADDR,
esp4_input, 0, esp4_ctlinput, 0,
0,
0, 0, 0, 0, ipsec_sysctl
},
#endif
{ SOCK_RAW, &inetdomain, IPPROTO_IPCOMP, PR_ATOMIC|PR_ADDR,
ipcomp4_input, 0, 0, 0,
0,
0, 0, 0, 0, ipsec_sysctl
},
#endif /* IPSEC */
{ SOCK_RAW, &inetdomain, IPPROTO_IPV4, PR_ATOMIC|PR_ADDR,
encap4_input, rip_output, 0, rip_ctloutput,
rip_usrreq, /*XXX*/
encap_init, 0, 0, 0,
},
#ifdef INET6
{ SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR,
encap4_input, rip_output, 0, rip_ctloutput,
rip_usrreq, /*XXX*/
0, 0, 0, 0,
},
#endif /* INET6 */
#if NGRE > 0
{ SOCK_RAW, &inetdomain, IPPROTO_GRE, PR_ATOMIC|PR_ADDR,
gre_input, rip_output, 0, rip_ctloutput,
rip_usrreq,
0, 0, 0, 0,
},
{ SOCK_RAW, &inetdomain, IPPROTO_MOBILE, PR_ATOMIC|PR_ADDR,
gre_mobile_input, rip_output, 0, rip_ctloutput,
rip_usrreq,
0, 0, 0, 0,
},
#endif /* NGRE > 0 */
{ SOCK_RAW, &inetdomain, IPPROTO_IGMP, PR_ATOMIC|PR_ADDR,
igmp_input, rip_output, 0, rip_ctloutput,
rip_usrreq,
igmp_init, igmp_fasttimo, igmp_slowtimo, 0,
},
#ifdef TPIP
{ SOCK_SEQPACKET,&inetdomain, IPPROTO_TP, PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN,
tpip_input, 0, tpip_ctlinput, tp_ctloutput,
tp_usrreq,
tp_init, 0, tp_slowtimo, tp_drain,
},
#endif /* TPIP */
/* EON (ISO CLNL over IP) */
#ifdef EON
{ SOCK_RAW, &inetdomain, IPPROTO_EON, 0,
eoninput, 0, eonctlinput, 0,
0,
eonprotoinit, 0, 0, 0,
},
#endif /* EON */
#ifdef NSIP
{ SOCK_RAW, &inetdomain, IPPROTO_IDP, PR_ATOMIC|PR_ADDR,
idpip_input, NULL, nsip_ctlinput, 0,
rip_usrreq,
0, 0, 0, 0,
},
#endif /* NSIP */
/* raw wildcard */
{ SOCK_RAW, &inetdomain, 0, PR_ATOMIC|PR_ADDR,
rip_input, rip_output, 0, rip_ctloutput,
rip_usrreq,
rip_init, 0, 0, 0,
},
};
#if NIPIP > 0
struct protosw ipip_protosw =
{ SOCK_RAW, &inetdomain, IPPROTO_IPIP, PR_ATOMIC|PR_ADDR,
ipip_input, rip_output, 0, rip_ctloutput,
rip_usrreq, /* XXX */
0, 0, 0, 0,
};
#endif /* NIPIP */
#if NGIF > 0
struct protosw in_gif_protosw =
{ SOCK_RAW, &inetdomain, 0/*IPPROTO_IPV[46]*/, PR_ATOMIC|PR_ADDR,
in_gif_input, rip_output, 0, rip_ctloutput,
rip_usrreq,
0, 0, 0, 0,
};
#endif /*NGIF*/
#if NSTF > 0
struct protosw in_stf_protosw =
{ SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR,
in_stf_input, rip_output, 0, rip_ctloutput,
rip_usrreq,
0, 0, 0, 0
};
#endif /*NSTF*/
struct domain inetdomain =
{ PF_INET, "internet", 0, 0, 0,
inetsw, &inetsw[sizeof(inetsw)/sizeof(inetsw[0])], 0,
rn_inithead, 32, sizeof(struct sockaddr_in) };
u_char ip_protox[IPPROTO_MAX];
int icmperrppslim = 100; /* 100pps */
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