ea9b5a9106
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.
194 lines
7.5 KiB
C
194 lines
7.5 KiB
C
/* $NetBSD: ip_icmp.h,v 1.15 2000/10/18 17:09:14 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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* @(#)ip_icmp.h 8.1 (Berkeley) 6/10/93
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*/
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#ifndef _NETINET_IP_ICMP_H_
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#define _NETINET_IP_ICMP_H_
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/*
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* Interface Control Message Protocol Definitions.
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* Per RFC 792, September 1981.
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*/
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/*
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* Internal of an ICMP Router Advertisement
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*/
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struct icmp_ra_addr {
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u_int32_t ira_addr;
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u_int32_t ira_preference;
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} __attribute__((__packed__));
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/*
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* Structure of an icmp header.
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*/
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struct icmp {
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u_int8_t icmp_type; /* type of message, see below */
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u_int8_t icmp_code; /* type sub code */
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u_int16_t icmp_cksum; /* ones complement cksum of struct */
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union {
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u_int8_t ih_pptr; /* ICMP_PARAMPROB */
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struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
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struct ih_idseq {
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n_short icd_id;
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n_short icd_seq;
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} ih_idseq __attribute__((__packed__));
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int32_t ih_void;
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/* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
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struct ih_pmtu {
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n_short ipm_void;
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n_short ipm_nextmtu;
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} ih_pmtu __attribute__((__packed__));
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struct ih_rtradv {
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u_int8_t irt_num_addrs;
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u_int8_t irt_wpa;
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u_int16_t irt_lifetime;
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} ih_rtradv __attribute__((__packed__));
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} icmp_hun /* XXX __attribute__((__packed__)) ??? */;
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#define icmp_pptr icmp_hun.ih_pptr
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#define icmp_gwaddr icmp_hun.ih_gwaddr
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#define icmp_id icmp_hun.ih_idseq.icd_id
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#define icmp_seq icmp_hun.ih_idseq.icd_seq
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#define icmp_void icmp_hun.ih_void
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#define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void
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#define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu
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#define icmp_num_addrs icmp_hun.ih_rtradv.irt_num_addrs
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#define icmp_wpa icmp_hun.ih_rtradv.irt_wpa
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#define icmp_lifetime icmp_hun.ih_rtradv.irt_lifetime
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union {
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struct id_ts {
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n_time its_otime;
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n_time its_rtime;
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n_time its_ttime;
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} id_ts __attribute__((__packed__));
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struct id_ip {
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struct ip idi_ip;
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/* options and then 64 bits of data */
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} id_ip __attribute__((__packed__));
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struct icmp_ra_addr id_radv;
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u_int32_t id_mask;
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int8_t id_data[1];
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} icmp_dun /* XXX __attribute__((__packed__)) ??? */;
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#define icmp_otime icmp_dun.id_ts.its_otime
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#define icmp_rtime icmp_dun.id_ts.its_rtime
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#define icmp_ttime icmp_dun.id_ts.its_ttime
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#define icmp_ip icmp_dun.id_ip.idi_ip
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#define icmp_radv icmp_dun.id_mask
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#define icmp_mask icmp_dun.id_mask
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#define icmp_data icmp_dun.id_data
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};
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/*
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* Lower bounds on packet lengths for various types.
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* For the error advice packets must first insure that the
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* packet is large enought to contain the returned ip header.
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* Only then can we do the check to see if 64 bits of packet
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* data have been returned, since we need to check the returned
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* ip header length.
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*/
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#define ICMP_MINLEN 8 /* abs minimum */
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#define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */
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#define ICMP_MASKLEN 12 /* address mask */
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#define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
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#define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
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/* N.B.: must separately check that ip_hl >= 5 */
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/*
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* Definition of type and code field values.
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*/
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#define ICMP_ECHOREPLY 0 /* echo reply */
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#define ICMP_UNREACH 3 /* dest unreachable, codes: */
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#define ICMP_UNREACH_NET 0 /* bad net */
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#define ICMP_UNREACH_HOST 1 /* bad host */
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#define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
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#define ICMP_UNREACH_PORT 3 /* bad port */
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#define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
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#define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
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#define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */
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#define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */
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#define ICMP_UNREACH_ISOLATED 8 /* src host isolated */
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#define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */
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#define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */
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#define ICMP_UNREACH_TOSNET 11 /* bad tos for net */
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#define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */
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#define ICMP_UNREACH_ADMIN_PROHIBIT 13 /* communication
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administratively
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prohibited */
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#define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */
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#define ICMP_REDIRECT 5 /* shorter route, codes: */
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#define ICMP_REDIRECT_NET 0 /* for network */
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#define ICMP_REDIRECT_HOST 1 /* for host */
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#define ICMP_REDIRECT_TOSNET 2 /* for tos and net */
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#define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */
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#define ICMP_ECHO 8 /* echo service */
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#define ICMP_ROUTERADVERT 9 /* router advertisement */
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#define ICMP_ROUTERSOLICIT 10 /* router solicitation */
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#define ICMP_TIMXCEED 11 /* time exceeded, code: */
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#define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */
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#define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */
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#define ICMP_PARAMPROB 12 /* ip header bad */
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#define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */
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#define ICMP_TSTAMP 13 /* timestamp request */
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#define ICMP_TSTAMPREPLY 14 /* timestamp reply */
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#define ICMP_IREQ 15 /* information request */
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#define ICMP_IREQREPLY 16 /* information reply */
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#define ICMP_MASKREQ 17 /* address mask request */
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#define ICMP_MASKREPLY 18 /* address mask reply */
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#define ICMP_MAXTYPE 18
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#define ICMP_INFOTYPE(type) \
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((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
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(type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
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(type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
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(type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
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(type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
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#ifdef _KERNEL
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void icmp_error __P((struct mbuf *, int, int, n_long, struct ifnet *));
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void icmp_mtudisc __P((struct icmp *, struct in_addr));
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void icmp_input __P((struct mbuf *, ...));
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void icmp_reflect __P((struct mbuf *));
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void icmp_send __P((struct mbuf *, struct mbuf *));
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int icmp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
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void icmp_mtudisc_callback_register __P((void (*)(struct in_addr)));
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#endif
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#endif /* _NETINET_IP_ICMP_H_ */
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