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001: /* Copyright (C) 1991, 92, 93, 95, 96, 97, 99 Free Software Foundation, Inc.
002:    This file is part of the GNU C Library.
003: 
004:    The GNU C Library is free software; you can redistribute it and/or
005:    modify it under the terms of the GNU Lesser General Public
006:    License as published by the Free Software Foundation; either
007:    version 2.1 of the License, or (at your option) any later version.
008: 
009:    The GNU C Library is distributed in the hope that it will be useful,
010:    but WITHOUT ANY WARRANTY; without even the implied warranty of
011:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
012:    Lesser General Public License for more details.
013: 
014:    You should have received a copy of the GNU Lesser General Public
015:    License along with the GNU C Library; if not, write to the Free
016:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
017:    02111-1307 USA.  */
018: 
019: #ifndef __NETINET_IP_ICMP_H
020: #define __NETINET_IP_ICMP_H    1
021: 
022: #include <sys/cdefs.h>
023: #include <sys/types.h>
024: 
025: __BEGIN_DECLS
026: 
027: struct icmphdr
028: {
029:   u_int8_t type;                /* message type */
030:   u_int8_t code;                /* type sub-code */
031:   u_int16_t checksum;
032:   union
033:   {
034:     struct
035:     {
036:       u_int16_t id;
037:       u_int16_t sequence;
038:     } echo;                     /* echo datagram */
039:     u_int32_t   gateway;        /* gateway address */
040:     struct
041:     {
042:       u_int16_t __unused;
043:       u_int16_t mtu;
044:     } frag;                     /* path mtu discovery */
045:   } un;
046: };
047: 
048: #define ICMP_ECHOREPLY          0       /* Echo Reply                   */
049: #define ICMP_DEST_UNREACH       3       /* Destination Unreachable      */
050: #define ICMP_SOURCE_QUENCH      4       /* Source Quench                */
051: #define ICMP_REDIRECT           5       /* Redirect (change route)      */
052: #define ICMP_ECHO               8       /* Echo Request                 */
053: #define ICMP_TIME_EXCEEDED      11      /* Time Exceeded                */
054: #define ICMP_PARAMETERPROB      12      /* Parameter Problem            */
055: #define ICMP_TIMESTAMP          13      /* Timestamp Request            */
056: #define ICMP_TIMESTAMPREPLY     14      /* Timestamp Reply              */
057: #define ICMP_INFO_REQUEST       15      /* Information Request          */
058: #define ICMP_INFO_REPLY         16      /* Information Reply            */
059: #define ICMP_ADDRESS            17      /* Address Mask Request         */
060: #define ICMP_ADDRESSREPLY       18      /* Address Mask Reply           */
061: #define NR_ICMP_TYPES           18
062: 
063: 
064: /* Codes for UNREACH. */
065: #define ICMP_NET_UNREACH        0       /* Network Unreachable          */
066: #define ICMP_HOST_UNREACH       1       /* Host Unreachable             */
067: #define ICMP_PROT_UNREACH       2       /* Protocol Unreachable         */
068: #define ICMP_PORT_UNREACH       3       /* Port Unreachable             */
069: #define ICMP_FRAG_NEEDED        4       /* Fragmentation Needed/DF set  */
070: #define ICMP_SR_FAILED          5       /* Source Route failed          */
071: #define ICMP_NET_UNKNOWN        6
072: #define ICMP_HOST_UNKNOWN       7
073: #define ICMP_HOST_ISOLATED      8
074: #define ICMP_NET_ANO            9
075: #define ICMP_HOST_ANO           10
076: #define ICMP_NET_UNR_TOS        11
077: #define ICMP_HOST_UNR_TOS       12
078: #define ICMP_PKT_FILTERED       13      /* Packet filtered */
079: #define ICMP_PREC_VIOLATION     14      /* Precedence violation */
080: #define ICMP_PREC_CUTOFF        15      /* Precedence cut off */
081: #define NR_ICMP_UNREACH         15      /* instead of hardcoding immediate value */
082: 
083: /* Codes for REDIRECT. */
084: #define ICMP_REDIR_NET          0       /* Redirect Net                 */
085: #define ICMP_REDIR_HOST         1       /* Redirect Host                */
086: #define ICMP_REDIR_NETTOS       2       /* Redirect Net for TOS         */
087: #define ICMP_REDIR_HOSTTOS      3       /* Redirect Host for TOS        */
088: 
089: /* Codes for TIME_EXCEEDED. */
090: #define ICMP_EXC_TTL            0       /* TTL count exceeded           */
091: #define ICMP_EXC_FRAGTIME       1       /* Fragment Reass time exceeded */
092: 
093: 
094: #ifdef __USE_BSD
095: /*
096:  * Copyright (c) 1982, 1986, 1993
097:  *      The Regents of the University of California.  All rights reserved.
098:  *
099:  * Redistribution and use in source and binary forms, with or without
100:  * modification, are permitted provided that the following conditions
101:  * are met:
102:  * 1. Redistributions of source code must retain the above copyright
103:  *    notice, this list of conditions and the following disclaimer.
104:  * 2. Redistributions in binary form must reproduce the above copyright
105:  *    notice, this list of conditions and the following disclaimer in the
106:  *    documentation and/or other materials provided with the distribution.
107:  * 4. Neither the name of the University nor the names of its contributors
108:  *    may be used to endorse or promote products derived from this software
109:  *    without specific prior written permission.
110:  *
111:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
112:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
113:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
114:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
115:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
116:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
117:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
118:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
119:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
120:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
121:  * SUCH DAMAGE.
122:  *
123:  *      @(#)ip_icmp.h   8.1 (Berkeley) 6/10/93
124:  */
125: 
126: #include <netinet/in.h>
127: #include <netinet/ip.h>
128: 
129: /*
130:  * Internal of an ICMP Router Advertisement
131:  */
132: struct icmp_ra_addr
133: {
134:   u_int32_t ira_addr;
135:   u_int32_t ira_preference;
136: };
137: 
138: struct icmp
139: {
140:   u_int8_t  icmp_type;  /* type of message, see below */
141:   u_int8_t  icmp_code;  /* type sub code */
142:   u_int16_t icmp_cksum; /* ones complement checksum of struct */
143:   union
144:   {
145:     u_char ih_pptr;             /* ICMP_PARAMPROB */
146:     struct in_addr ih_gwaddr;   /* gateway address */
147:     struct ih_idseq             /* echo datagram */
148:     {
149:       u_int16_t icd_id;
150:       u_int16_t icd_seq;
151:     } ih_idseq;
152:     u_int32_t ih_void;
153: 
154:     /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
155:     struct ih_pmtu
156:     {
157:       u_int16_t ipm_void;
158:       u_int16_t ipm_nextmtu;
159:     } ih_pmtu;
160: 
161:     struct ih_rtradv
162:     {
163:       u_int8_t irt_num_addrs;
164:       u_int8_t irt_wpa;
165:       u_int16_t irt_lifetime;
166:     } ih_rtradv;
167:   } icmp_hun;
168: #define icmp_pptr       icmp_hun.ih_pptr
169: #define icmp_gwaddr     icmp_hun.ih_gwaddr
170: #define icmp_id         icmp_hun.ih_idseq.icd_id
171: #define icmp_seq        icmp_hun.ih_idseq.icd_seq
172: #define icmp_void       icmp_hun.ih_void
173: #define icmp_pmvoid     icmp_hun.ih_pmtu.ipm_void
174: #define icmp_nextmtu    icmp_hun.ih_pmtu.ipm_nextmtu
175: #define icmp_num_addrs  icmp_hun.ih_rtradv.irt_num_addrs
176: #define icmp_wpa        icmp_hun.ih_rtradv.irt_wpa
177: #define icmp_lifetime   icmp_hun.ih_rtradv.irt_lifetime
178:   union
179:   {
180:     struct
181:     {
182:       u_int32_t its_otime;
183:       u_int32_t its_rtime;
184:       u_int32_t its_ttime;
185:     } id_ts;
186:     struct
187:     {
188:       struct ip idi_ip;
189:       /* options and then 64 bits of data */
190:     } id_ip;
191:     struct icmp_ra_addr id_radv;
192:     u_int32_t   id_mask;
193:     u_int8_t    id_data[1];
194:   } icmp_dun;
195: #define icmp_otime      icmp_dun.id_ts.its_otime
196: #define icmp_rtime      icmp_dun.id_ts.its_rtime
197: #define icmp_ttime      icmp_dun.id_ts.its_ttime
198: #define icmp_ip         icmp_dun.id_ip.idi_ip
199: #define icmp_radv       icmp_dun.id_radv
200: #define icmp_mask       icmp_dun.id_mask
201: #define icmp_data       icmp_dun.id_data
202: };
203: 
204: /*
205:  * Lower bounds on packet lengths for various types.
206:  * For the error advice packets must first insure that the
207:  * packet is large enough to contain the returned ip header.
208:  * Only then can we do the check to see if 64 bits of packet
209:  * data have been returned, since we need to check the returned
210:  * ip header length.
211:  */
212: #define ICMP_MINLEN     8                               /* abs minimum */
213: #define ICMP_TSLEN      (8 + 3 * sizeof (n_time))       /* timestamp */
214: #define ICMP_MASKLEN    12                              /* address mask */
215: #define ICMP_ADVLENMIN  (8 + sizeof (struct ip) + 8)    /* min */
216: #ifndef _IP_VHL
217: #define ICMP_ADVLEN(p)  (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
218:         /* N.B.: must separately check that ip_hl >= 5 */
219: #else
220: #define ICMP_ADVLEN(p)  (8 + (IP_VHL_HL((p)->icmp_ip.ip_vhl) << 2) + 8)
221:         /* N.B.: must separately check that header length >= 5 */
222: #endif
223: 
224: /* Definition of type and code fields. */
225: /* defined above: ICMP_ECHOREPLY, ICMP_REDIRECT, ICMP_ECHO */
226: #define ICMP_UNREACH            3               /* dest unreachable, codes: */
227: #define ICMP_SOURCEQUENCH       4               /* packet lost, slow down */
228: #define ICMP_ROUTERADVERT       9               /* router advertisement */
229: #define ICMP_ROUTERSOLICIT      10              /* router solicitation */
230: #define ICMP_TIMXCEED           11              /* time exceeded, code: */
231: #define ICMP_PARAMPROB          12              /* ip header bad */
232: #define ICMP_TSTAMP             13              /* timestamp request */
233: #define ICMP_TSTAMPREPLY        14              /* timestamp reply */
234: #define ICMP_IREQ               15              /* information request */
235: #define ICMP_IREQREPLY          16              /* information reply */
236: #define ICMP_MASKREQ            17              /* address mask request */
237: #define ICMP_MASKREPLY          18              /* address mask reply */
238: 
239: #define ICMP_MAXTYPE            18
240: 
241: /* UNREACH codes */
242: #define ICMP_UNREACH_NET                0       /* bad net */
243: #define ICMP_UNREACH_HOST               1       /* bad host */
244: #define ICMP_UNREACH_PROTOCOL           2       /* bad protocol */
245: #define ICMP_UNREACH_PORT               3       /* bad port */
246: #define ICMP_UNREACH_NEEDFRAG           4       /* IP_DF caused drop */
247: #define ICMP_UNREACH_SRCFAIL            5       /* src route failed */
248: #define ICMP_UNREACH_NET_UNKNOWN        6       /* unknown net */
249: #define ICMP_UNREACH_HOST_UNKNOWN       7       /* unknown host */
250: #define ICMP_UNREACH_ISOLATED           8       /* src host isolated */
251: #define ICMP_UNREACH_NET_PROHIB         9       /* net denied */
252: #define ICMP_UNREACH_HOST_PROHIB        10      /* host denied */
253: #define ICMP_UNREACH_TOSNET             11      /* bad tos for net */
254: #define ICMP_UNREACH_TOSHOST            12      /* bad tos for host */
255: #define ICMP_UNREACH_FILTER_PROHIB      13      /* admin prohib */
256: #define ICMP_UNREACH_HOST_PRECEDENCE    14      /* host prec vio. */
257: #define ICMP_UNREACH_PRECEDENCE_CUTOFF  15      /* prec cutoff */
258: 
259: /* REDIRECT codes */
260: #define ICMP_REDIRECT_NET       0               /* for network */
261: #define ICMP_REDIRECT_HOST      1               /* for host */
262: #define ICMP_REDIRECT_TOSNET    2               /* for tos and net */
263: #define ICMP_REDIRECT_TOSHOST   3               /* for tos and host */
264: 
265: /* TIMEXCEED codes */
266: #define ICMP_TIMXCEED_INTRANS   0               /* ttl==0 in transit */
267: #define ICMP_TIMXCEED_REASS     1               /* ttl==0 in reass */
268: 
269: /* PARAMPROB code */
270: #define ICMP_PARAMPROB_OPTABSENT 1              /* req. opt. absent */
271: 
272: #define ICMP_INFOTYPE(type) \
273:         ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
274:         (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
275:         (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
276:         (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
277:         (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
278: 
279: #endif /* __USE_BSD */
280: 
281: __END_DECLS
282: 
283: #endif /* netinet/ip_icmp.h */
284: 

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