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/* $NetBSD: ip_icmp.h,v 1.44 2022/05/24 20:50:20 andvar Exp $ */
/*
* 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. 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.
*
* @(#)ip_icmp.h 8.1 (Berkeley) 6/10/93
*/
#ifndef _NETINET_IP_ICMP_H_
#define _NETINET_IP_ICMP_H_
/*
* Interface Control Message Protocol Definitions.
* Per RFC 792, September 1981.
*/
/*
* Internal of an ICMP Router Advertisement
*/
struct icmp_ra_addr {
uint32_t ira_addr;
uint32_t ira_preference;
};
/*
* Structure of an icmp header.
*/
struct icmp {
uint8_t icmp_type; /* type of message, see below */
uint8_t icmp_code; /* type sub code */
uint16_t icmp_cksum; /* ones complement cksum of struct */
union {
int32_t ih_void;
/* Extended Header (RFC4884) */
struct ih_exthdr {
uint8_t iex_void1;
uint8_t iex_length;
uint16_t iex_void2;
} ih_exthdr;
/* ICMP_PARAMPROB */
uint8_t ih_pptr;
/* ICMP_REDIRECT */
struct in_addr ih_gwaddr;
/* ICMP_ECHO and friends */
struct ih_idseq {
uint16_t icd_id;
uint16_t icd_seq;
} ih_idseq;
/* ICMP_UNREACH_NEEDFRAG (Path MTU Discovery, RFC1191) */
struct ih_pmtu {
uint16_t ipm_void;
uint16_t ipm_nextmtu;
} ih_pmtu;
/* ICMP_ROUTERADVERT */
struct ih_rtradv {
uint8_t irt_num_addrs;
uint8_t irt_wpa;
uint16_t irt_lifetime;
} ih_rtradv;
} icmp_hun;
#define icmp_pptr icmp_hun.ih_pptr
#define icmp_gwaddr icmp_hun.ih_gwaddr
#define icmp_id icmp_hun.ih_idseq.icd_id
#define icmp_seq icmp_hun.ih_idseq.icd_seq
#define icmp_void icmp_hun.ih_void
#define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void
#define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu
#define icmp_num_addrs icmp_hun.ih_rtradv.irt_num_addrs
#define icmp_wpa icmp_hun.ih_rtradv.irt_wpa
#define icmp_lifetime icmp_hun.ih_rtradv.irt_lifetime
union {
/* ICMP_TSTAMP and friends */
struct id_ts {
uint32_t its_otime;
uint32_t its_rtime;
uint32_t its_ttime;
} id_ts;
struct id_ip {
struct ip idi_ip;
/* options and then 64 bits of data */
} id_ip;
/* ICMP_ROUTERADVERT */
struct icmp_ra_addr id_radv;
/* ICMP_MASKREQ and friends */
uint32_t id_mask;
int8_t id_data[1];
} icmp_dun;
#define icmp_otime icmp_dun.id_ts.its_otime
#define icmp_rtime icmp_dun.id_ts.its_rtime
#define icmp_ttime icmp_dun.id_ts.its_ttime
#define icmp_ip icmp_dun.id_ip.idi_ip
#define icmp_radv icmp_dun.id_radv
#define icmp_mask icmp_dun.id_mask
#define icmp_data icmp_dun.id_data
};
#define ICMP_EXT_VERSION 2
#define ICMP_EXT_OFFSET 128
/*
* ICMP Extension Structure Header (RFC4884).
*/
struct icmp_ext_hdr {
#if BYTE_ORDER == BIG_ENDIAN
uint8_t version:4;
uint8_t rsvd1:4;
#else
uint8_t rsvd1:4;
uint8_t version:4;
#endif
uint8_t rsvd2;
uint16_t checksum;
};
/*
* ICMP Extension Object Header (RFC4884).
*/
struct icmp_ext_obj_hdr {
uint16_t length;
uint8_t class_num;
uint8_t c_type;
};
#ifdef __CTASSERT
__CTASSERT(sizeof(struct icmp_ra_addr) == 8);
__CTASSERT(sizeof(struct icmp) == 28);
__CTASSERT(sizeof(struct icmp_ext_hdr) == 4);
__CTASSERT(sizeof(struct icmp_ext_obj_hdr) == 4);
#endif
/*
* Lower bounds on packet lengths for various types.
* For the error advice packets must first insure that the
* packet is large enough to contain the returned ip header.
* Only then can we do the check to see if 64 bits of packet
* data have been returned, since we need to check the returned
* ip header length.
*/
#define ICMP_MINLEN 8 /* abs minimum */
#define ICMP_TSLEN (8 + 3 * sizeof(uint32_t)) /* timestamp */
#define ICMP_MASKLEN 12 /* address mask */
#define ICMP_ADVLENMIN (8 + sizeof(struct ip) + 8) /* min */
#define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
/* N.B.: must separately check that ip_hl >= 5 */
/*
* Definition of type and code field values.
*/
#define ICMP_ECHOREPLY 0 /* echo reply */
#define ICMP_UNREACH 3 /* dest unreachable, codes: */
#define ICMP_UNREACH_NET 0 /* bad net */
#define ICMP_UNREACH_HOST 1 /* bad host */
#define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
#define ICMP_UNREACH_PORT 3 /* bad port */
#define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
#define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
#define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */
#define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */
#define ICMP_UNREACH_ISOLATED 8 /* src host isolated */
#define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */
#define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */
#define ICMP_UNREACH_TOSNET 11 /* bad tos for net */
#define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */
#define ICMP_UNREACH_ADMIN_PROHIBIT 13 /* communication
administratively
prohibited */
#define ICMP_UNREACH_HOST_PREC 14 /* host precedence
violation */
#define ICMP_UNREACH_PREC_CUTOFF 15 /* precedence cutoff */
#define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */
#define ICMP_REDIRECT 5 /* shorter route, codes: */
#define ICMP_REDIRECT_NET 0 /* for network */
#define ICMP_REDIRECT_HOST 1 /* for host */
#define ICMP_REDIRECT_TOSNET 2 /* for tos and net */
#define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */
#define ICMP_ALTHOSTADDR 6 /* alternative host address */
#define ICMP_ECHO 8 /* echo service */
#define ICMP_ROUTERADVERT 9 /* router advertisement */
#define ICMP_ROUTERADVERT_NORMAL 0
#define ICMP_ROUTERADVERT_NOROUTE 16
#define ICMP_ROUTERSOLICIT 10 /* router solicitation */
#define ICMP_TIMXCEED 11 /* time exceeded, code: */
#define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */
#define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */
#define ICMP_PARAMPROB 12 /* ip header bad */
#define ICMP_PARAMPROB_ERRATPTR 0
#define ICMP_PARAMPROB_OPTABSENT 1
#define ICMP_PARAMPROB_LENGTH 2
#define ICMP_TSTAMP 13 /* timestamp request */
#define ICMP_TSTAMPREPLY 14 /* timestamp reply */
#define ICMP_IREQ 15 /* information request */
#define ICMP_IREQREPLY 16 /* information reply */
#define ICMP_MASKREQ 17 /* address mask request */
#define ICMP_MASKREPLY 18 /* address mask reply */
#define ICMP_TRACEROUTE 30 /* traceroute */
#define ICMP_DATACONVERR 31 /* data conversion error */
#define ICMP_MOBILE_REDIRECT 32 /* mobile redirect */
#define ICMP_IPV6_WHEREAREYOU 33 /* ipv6 where are you */
#define ICMP_IPV6_IAMHERE 34 /* ipv6 i am here */
#define ICMP_MOBILE_REGREQUEST 35 /* mobile registration req */
#define ICMP_MOBILE_REGREPLY 36 /* mobile registration reply */
#define ICMP_SKIP 39 /* SKIP */
#define ICMP_PHOTURIS 40 /* security */
#define ICMP_PHOTURIS_UNKNOWN_INDEX 0 /* unknown sec index */
#define ICMP_PHOTURIS_AUTH_FAILED 1 /* auth failed */
#define ICMP_PHOTURIS_DECOMPRESS_FAILED 2 /* decompress failed */
#define ICMP_PHOTURIS_DECRYPT_FAILED 3 /* decrypt failed */
#define ICMP_PHOTURIS_NEED_AUTHN 4 /* no authentication */
#define ICMP_PHOTURIS_NEED_AUTHZ 5 /* no authorization */
#define ICMP_MAXTYPE 40
#define ICMP_NTYPES (ICMP_MAXTYPE + 1)
#ifdef ICMP_STRINGS
static const char *icmp_type[] = {
"echoreply", "unassigned_1", "unassigned_2", "unreach",
"sourcequench", "redirect", "althostaddr", "unassigned_7",
"echo", "routeradvert", "routersolicit", "timxceed",
"paramprob", "tstamp", "tstampreply", "ireq",
"ireqreply", "maskreq", "maskreply", "reserved_19",
"reserved_20", "reserved_21", "reserved_22", "reserved_23",
"reserved_24", "reserved_25", "reserved_26", "reserved_27",
"reserved_28", "reserved_29", "traceroute", "dataconverr",
"mobile_redirect", "ipv6_whereareyou", "ipv6_iamhere",
"mobile_regrequest", "mobile_regreply", "reserved_37",
"reserved_38", "skip", "photuris", NULL
};
static const char *icmp_code_none[] = { "none", NULL };
static const char *icmp_code_unreach[] = {
"net", "host", "oprt", "needfrag", "srcfail", "net_unknown",
"host_unknown", "isolated", "net_prohib", "host_prohib",
"tosnet", "toshost", "admin_prohibit", "host_prec", "prec_cutoff", NULL
};
static const char *icmp_code_redirect[] = {
"net", "host", "tosnet", "toshost", NULL
};
static const char *icmp_code_routeradvert[] = {
"normal", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "",
"noroute", NULL
};
static const char *icmp_code_timxceed[] = {
"intrans", "reass", NULL
};
static const char *icmp_code_paramprob[] = {
"erratptr", "optabsent", "length", NULL
};
static const char *icmp_code_photuris[] = {
"unknown_index", "auth_failed", "decompress_failed",
"decrypt_failed", "need_authn", "need_authz", NULL
};
#endif
#define ICMP_INFOTYPE(type) \
((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
(type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
(type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
(type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
(type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
#ifdef _KERNEL
void icmp_error(struct mbuf *, int, int, n_long, int);
void icmp_mtudisc(struct icmp *, struct in_addr);
void icmp_input(struct mbuf *, int, int);
void icmp_init(void);
void icmp_reflect(struct mbuf *);
void icmp_mtudisc_callback_register(void (*)(struct in_addr));
int icmp_ratelimit(const struct in_addr *, const int, const int);
void icmp_mtudisc_lock(void);
void icmp_mtudisc_unlock(void);
#endif
#endif /* !_NETINET_IP_ICMP_H_ */
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