ISC DHCP  4.4.2b1
A reference DHCPv4 and DHCPv6 implementation
ip_icmp.h
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1 /* $NetBSD: ip_icmp.h,v 1.11 1996/08/03 15:48:18 neil Exp $ */
2 
3 /*
4  * Copyright (c) 1982, 1986, 1993
5  * The Regents of the University of California. All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  * notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  * notice, this list of conditions and the following disclaimer in the
14  * documentation and/or other materials provided with the distribution.
15  * 3. Neither the name of the University nor the names of its contributors
16  * may be used to endorse or promote products derived from this software
17  * without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  *
31  * @(#)ip_icmp.h 8.1 (Berkeley) 6/10/93
32  */
33 
34 
35 /*
36  * Interface Control Message Protocol Definitions.
37  * Per RFC 792, September 1981.
38  */
39 
40 /*
41  * Internal of an ICMP Router Advertisement
42  */
43 struct icmp_ra_addr {
44  u_int32_t ira_addr;
45  u_int32_t ira_preference;
46 };
47 
48 /*
49  * Structure of an icmp header.
50  */
51 struct icmp {
52  u_int8_t icmp_type; /* type of message, see below */
53  u_int8_t icmp_code; /* type sub code */
54  u_int16_t icmp_cksum; /* ones complement cksum of struct */
55  union {
56  u_int8_t ih_pptr; /* ICMP_PARAMPROB */
57  struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
58  struct ih_idseq {
59  int16_t icd_id;
60  int16_t icd_seq;
61  } ih_idseq;
62  int32_t ih_void;
63 
64  /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
65  struct ih_pmtu {
66  int16_t ipm_void;
67  int16_t ipm_nextmtu;
68  } ih_pmtu;
69  struct ih_rtradv {
70  u_int8_t irt_num_addrs;
71  u_int8_t irt_wpa;
72  u_int16_t irt_lifetime;
73  } ih_rtradv;
74  } icmp_hun;
75 #define icmp_pptr icmp_hun.ih_pptr
76 #define icmp_gwaddr icmp_hun.ih_gwaddr
77 #define icmp_id icmp_hun.ih_idseq.icd_id
78 #define icmp_seq icmp_hun.ih_idseq.icd_seq
79 #define icmp_void icmp_hun.ih_void
80 #define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void
81 #define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu
82 #define icmp_num_addrs icmp_hun.ih_rtradv.irt_num_addrs
83 #define icmp_wpa icmp_hun.ih_rtradv.irt_wpa
84 #define icmp_lifetime icmp_hun.ih_rtradv.irt_lifetime
85  union {
86  struct id_ts {
87  u_int32_t its_otime;
88  u_int32_t its_rtime;
89  u_int32_t its_ttime;
90  } id_ts;
91  struct id_ip {
92  struct ip idi_ip;
93  /* options and then 64 bits of data */
94  } id_ip;
96  u_int32_t id_mask;
97  int8_t id_data[1];
98  } icmp_dun;
99 #define icmp_otime icmp_dun.id_ts.its_otime
100 #define icmp_rtime icmp_dun.id_ts.its_rtime
101 #define icmp_ttime icmp_dun.id_ts.its_ttime
102 #define icmp_ip icmp_dun.id_ip.idi_ip
103 #define icmp_radv icmp_dun.id_mask
104 #define icmp_mask icmp_dun.id_mask
105 #define icmp_data icmp_dun.id_data
106 };
107 
108 /*
109  * Lower bounds on packet lengths for various types.
110  * For the error advice packets must first insure that the
111  * packet is large enought to contain the returned ip header.
112  * Only then can we do the check to see if 64 bits of packet
113  * data have been returned, since we need to check the returned
114  * ip header length.
115  */
116 #define ICMP_MINLEN 8 /* abs minimum */
117 #define ICMP_TSLEN (8 + 3 * sizeof (u_int32_t)) /* timestamp */
118 #define ICMP_MASKLEN 12 /* address mask */
119 #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
120 #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
121  /* N.B.: must separately check that ip_hl >= 5 */
122 
123 /*
124  * Definition of type and code field values.
125  */
126 #define ICMP_ECHOREPLY 0 /* echo reply */
127 #define ICMP_UNREACH 3 /* dest unreachable, codes: */
128 #define ICMP_UNREACH_NET 0 /* bad net */
129 #define ICMP_UNREACH_HOST 1 /* bad host */
130 #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
131 #define ICMP_UNREACH_PORT 3 /* bad port */
132 #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
133 #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
134 #define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */
135 #define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */
136 #define ICMP_UNREACH_ISOLATED 8 /* src host isolated */
137 #define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */
138 #define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */
139 #define ICMP_UNREACH_TOSNET 11 /* bad tos for net */
140 #define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */
141 #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */
142 #define ICMP_REDIRECT 5 /* shorter route, codes: */
143 #define ICMP_REDIRECT_NET 0 /* for network */
144 #define ICMP_REDIRECT_HOST 1 /* for host */
145 #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */
146 #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */
147 #define ICMP_ECHO 8 /* echo service */
148 #define ICMP_ROUTERADVERT 9 /* router advertisement */
149 #define ICMP_ROUTERSOLICIT 10 /* router solicitation */
150 #define ICMP_TIMXCEED 11 /* time exceeded, code: */
151 #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */
152 #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */
153 #define ICMP_PARAMPROB 12 /* ip header bad */
154 #define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */
155 #define ICMP_TSTAMP 13 /* timestamp request */
156 #define ICMP_TSTAMPREPLY 14 /* timestamp reply */
157 #define ICMP_IREQ 15 /* information request */
158 #define ICMP_IREQREPLY 16 /* information reply */
159 #define ICMP_MASKREQ 17 /* address mask request */
160 #define ICMP_MASKREPLY 18 /* address mask reply */
161 
162 #define ICMP_MAXTYPE 18
163 
164 #define ICMP_INFOTYPE(type) \
165  ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
166  (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
167  (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
168  (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
169  (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
170 
171 #ifdef _KERNEL
172 void icmp_error __P((struct mbuf *, int, int, n_long, struct ifnet *));
173 void icmp_input __P((struct mbuf *, ...));
174 void icmp_reflect __P((struct mbuf *));
175 void icmp_send __P((struct mbuf *, struct mbuf *));
176 int icmp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
177 #endif
178 
icmp::irt_lifetime
u_int16_t irt_lifetime
Definition: ip_icmp.h:72
icmp::ih_void
int32_t ih_void
Definition: ip_icmp.h:62
icmp::ipm_void
int16_t ipm_void
Definition: ip_icmp.h:66
icmp::its_rtime
u_int32_t its_rtime
Definition: ip_icmp.h:88
icmp_ra_addr::ira_addr
u_int32_t ira_addr
Definition: ip_icmp.h:44
icmp::icmp_code
u_int8_t icmp_code
Definition: ip_icmp.h:53
icmp::ih_pptr
u_int8_t ih_pptr
Definition: ip_icmp.h:56
icmp_ra_addr::ira_preference
u_int32_t ira_preference
Definition: ip_icmp.h:45
icmp::icmp_cksum
u_int16_t icmp_cksum
Definition: ip_icmp.h:54
icmp::irt_num_addrs
u_int8_t irt_num_addrs
Definition: ip_icmp.h:70
icmp::ih_pmtu
struct icmp::@1::ih_pmtu ih_pmtu
icmp_ra_addr
Definition: ip_icmp.h:43
icmp::ih_rtradv
struct icmp::@1::ih_rtradv ih_rtradv
icmp::ipm_nextmtu
int16_t ipm_nextmtu
Definition: ip_icmp.h:67
icmp::ih_idseq
struct icmp::@1::ih_idseq ih_idseq
icmp::id_ip
struct icmp::@2::id_ip id_ip
icmp::irt_wpa
u_int8_t irt_wpa
Definition: ip_icmp.h:71
icmp::id_ts
struct icmp::@2::id_ts id_ts
icmp::id_data
int8_t id_data[1]
Definition: ip_icmp.h:97
icmp::id_mask
u_int32_t id_mask
Definition: ip_icmp.h:96
icmp::icd_seq
int16_t icd_seq
Definition: ip_icmp.h:60
icmp
Definition: ip_icmp.h:51
ip
Definition: ip.h:47
icmp::its_ttime
u_int32_t its_ttime
Definition: ip_icmp.h:89
icmp::icmp_type
u_int8_t icmp_type
Definition: ip_icmp.h:52
icmp::icmp_hun
union icmp::@1 icmp_hun
icmp::icmp_dun
union icmp::@2 icmp_dun
icmp::its_otime
u_int32_t its_otime
Definition: ip_icmp.h:87
icmp::ih_gwaddr
struct in_addr ih_gwaddr
Definition: ip_icmp.h:57
icmp::idi_ip
struct ip idi_ip
Definition: ip_icmp.h:92
icmp::icd_id
int16_t icd_id
Definition: ip_icmp.h:59
icmp::id_radv
struct icmp_ra_addr id_radv
Definition: ip_icmp.h:95