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33 * @(#)ip_icmp.h 8.1 (Berkeley) 6/10/93
34 * $FreeBSD: src/sys/netinet/ip_icmp.h,v 1.16 1999/12/29 04:41:01 peter Exp $
35 * $DragonFly: src/sys/netinet/ip_icmp.h,v 1.7 2005/10/28 15:56:47 liamfoy Exp $
38 #ifndef _NETINET_IP_ICMP_H_
39 #define _NETINET_IP_ICMP_H_
42 * Interface Control Message Protocol Definitions.
43 * Per RFC 792, September 1981.
47 * Internal of an ICMP Router Advertisement
51 u_int32_t ira_preference;
55 * Structure of an icmp header.
58 u_char icmp_type; /* type of message, see below */
59 u_char icmp_code; /* type sub code */
60 u_short icmp_cksum; /* ones complement cksum of struct */
62 u_char ih_pptr; /* ICMP_PARAMPROB */
63 struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
70 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
79 u_int16_t irt_lifetime;
82 #define icmp_pptr icmp_hun.ih_pptr
83 #define icmp_gwaddr icmp_hun.ih_gwaddr
84 #define icmp_id icmp_hun.ih_idseq.icd_id
85 #define icmp_seq icmp_hun.ih_idseq.icd_seq
86 #define icmp_void icmp_hun.ih_void
87 #define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void
88 #define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu
89 #define icmp_num_addrs icmp_hun.ih_rtradv.irt_num_addrs
90 #define icmp_wpa icmp_hun.ih_rtradv.irt_wpa
91 #define icmp_lifetime icmp_hun.ih_rtradv.irt_lifetime
100 /* options and then 64 bits of data */
102 struct icmp_ra_addr id_radv;
106 #define icmp_otime icmp_dun.id_ts.its_otime
107 #define icmp_rtime icmp_dun.id_ts.its_rtime
108 #define icmp_ttime icmp_dun.id_ts.its_ttime
109 #define icmp_ip icmp_dun.id_ip.idi_ip
110 #define icmp_radv icmp_dun.id_radv
111 #define icmp_mask icmp_dun.id_mask
112 #define icmp_data icmp_dun.id_data
116 * Lower bounds on packet lengths for various types.
117 * For the error advice packets must first insure that the
118 * packet is large enough to contain the returned ip header.
119 * Only then can we do the check to see if 64 bits of packet
120 * data have been returned, since we need to check the returned
123 #define ICMP_MINLEN 8 /* abs minimum */
124 #define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */
125 #define ICMP_MASKLEN 12 /* address mask */
126 #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
128 #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
129 /* N.B.: must separately check that ip_hl >= 5 */
131 #define ICMP_ADVLEN(p) (8 + (IP_VHL_HL((p)->icmp_ip.ip_vhl) << 2) + 8)
132 /* N.B.: must separately check that header length >= 5 */
136 * Definition of type and code field values.
138 #define ICMP_ECHOREPLY 0 /* echo reply */
139 #define ICMP_UNREACH 3 /* dest unreachable, codes: */
140 #define ICMP_UNREACH_NET 0 /* bad net */
141 #define ICMP_UNREACH_HOST 1 /* bad host */
142 #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
143 #define ICMP_UNREACH_PORT 3 /* bad port */
144 #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
145 #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
146 #define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */
147 #define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */
148 #define ICMP_UNREACH_ISOLATED 8 /* src host isolated */
149 #define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */
150 #define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */
151 #define ICMP_UNREACH_TOSNET 11 /* bad tos for net */
152 #define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */
153 #define ICMP_UNREACH_FILTER_PROHIB 13 /* admin prohib */
154 #define ICMP_UNREACH_HOST_PRECEDENCE 14 /* host prec vio. */
155 #define ICMP_UNREACH_PRECEDENCE_CUTOFF 15 /* prec cutoff */
156 #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */
157 #define ICMP_REDIRECT 5 /* shorter route, codes: */
158 #define ICMP_REDIRECT_NET 0 /* for network */
159 #define ICMP_REDIRECT_HOST 1 /* for host */
160 #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */
161 #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */
162 #define ICMP_ALTHOSTADDR 6 /* alternate host address */
163 #define ICMP_ECHO 8 /* echo service */
164 #define ICMP_ROUTERADVERT 9 /* router advertisement */
165 #define ICMP_ROUTERADVERT_NORMAL 0 /* normal advertisement */
166 #define ICMP_ROUTERADVERT_NOROUTE_COMMON 16 /* selective routing */
167 #define ICMP_ROUTERSOLICIT 10 /* router solicitation */
168 #define ICMP_TIMXCEED 11 /* time exceeded, code: */
169 #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */
170 #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */
171 #define ICMP_PARAMPROB 12 /* ip header bad */
172 #define ICMP_PARAMPROB_ERRATPTR 0 /* error at param ptr */
173 #define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */
174 #define ICMP_PARAMPROB_LENGTH 2 /* bad length */
175 #define ICMP_TSTAMP 13 /* timestamp request */
176 #define ICMP_TSTAMPREPLY 14 /* timestamp reply */
177 #define ICMP_IREQ 15 /* information request */
178 #define ICMP_IREQREPLY 16 /* information reply */
179 #define ICMP_MASKREQ 17 /* address mask request */
180 #define ICMP_MASKREPLY 18 /* address mask reply */
181 #define ICMP_TRACEROUTE 30 /* traceroute */
182 #define ICMP_DATACONVERR 31 /* data conversion error */
183 #define ICMP_MOBILE_REDIRECT 32 /* mobile host redirect */
184 #define ICMP_IPV6_WHEREAREYOU 33 /* IPv6 where-are-you */
185 #define ICMP_IPV6_IAMHERE 34 /* IPv6 i-am-here */
186 #define ICMP_MOBILE_REGREQUEST 35 /* mobile registration req */
187 #define ICMP_MOBILE_REGREPLY 36 /* mobile registreation reply */
188 #define ICMP_SKIP 39 /* SKIP */
189 #define ICMP_PHOTURIS 40 /* Photuris */
190 #define ICMP_PHOTURIS_UNKNOWN_INDEX 1 /* unknown sec index */
191 #define ICMP_PHOTURIS_AUTH_FAILED 2 /* auth failed */
192 #define ICMP_PHOTURIS_DECRYPT_FAILED 3 /* decrypt failed */
194 #define ICMP_MAXTYPE 40
196 #define ICMP_INFOTYPE(type) \
197 ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
198 (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
199 (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
200 (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
201 (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
204 void icmp_error (struct mbuf *, int, int, n_long, int);
205 void icmp_input (struct mbuf *, ...);
206 int ip_next_mtu (int, int);