1 | /* SPDX-License-Identifier: BSD-3-Clause */ |
2 | /* |
3 | * Copyright (c) 1982, 1986, 1993 |
4 | * The Regents of the University of California. All rights reserved. |
5 | * |
6 | * Redistribution and use in source and binary forms, with or without |
7 | * modification, are permitted provided that the following conditions |
8 | * are met: |
9 | * 1. Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * 2. Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
14 | * 3. Neither the name of the University nor the names of its contributors |
15 | * may be used to endorse or promote products derived from this software |
16 | * without specific prior written permission. |
17 | * |
18 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
24 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
26 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
27 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
28 | * SUCH DAMAGE. |
29 | * |
30 | * @(#)ip_icmp.h 8.1 (Berkeley) 6/10/93 |
31 | * ip_icmp.h,v 1.4 1995/05/30 08:09:43 rgrimes Exp |
32 | */ |
33 | |
34 | #ifndef NETINET_IP_ICMP_H |
35 | #define NETINET_IP_ICMP_H |
36 | |
37 | /* |
38 | * Interface Control Message Protocol Definitions. |
39 | * Per RFC 792, September 1981. |
40 | */ |
41 | |
42 | typedef uint32_t n_time; |
43 | |
44 | /* |
45 | * Structure of an icmp header. |
46 | */ |
47 | struct icmp { |
48 | uint8_t icmp_type; /* type of message, see below */ |
49 | uint8_t icmp_code; /* type sub code */ |
50 | uint16_t icmp_cksum; /* ones complement cksum of struct */ |
51 | union { |
52 | uint8_t ih_pptr; /* ICMP_PARAMPROB */ |
53 | struct in_addr ih_gwaddr; /* ICMP_REDIRECT */ |
54 | struct ih_idseq { |
55 | uint16_t icd_id; |
56 | uint16_t icd_seq; |
57 | } ih_idseq; |
58 | int ih_void; |
59 | |
60 | /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */ |
61 | struct ih_pmtu { |
62 | uint16_t ipm_void; |
63 | uint16_t ipm_nextmtu; |
64 | } ih_pmtu; |
65 | } icmp_hun; |
66 | #define icmp_pptr icmp_hun.ih_pptr |
67 | #define icmp_gwaddr icmp_hun.ih_gwaddr |
68 | #define icmp_id icmp_hun.ih_idseq.icd_id |
69 | #define icmp_seq icmp_hun.ih_idseq.icd_seq |
70 | #define icmp_void icmp_hun.ih_void |
71 | #define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void |
72 | #define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu |
73 | union { |
74 | struct id_ts { |
75 | n_time its_otime; |
76 | n_time its_rtime; |
77 | n_time its_ttime; |
78 | } id_ts; |
79 | struct id_ip { |
80 | struct ip idi_ip; |
81 | /* options and then 64 bits of data */ |
82 | } id_ip; |
83 | uint32_t id_mask; |
84 | char id_data[1]; |
85 | } icmp_dun; |
86 | #define icmp_otime icmp_dun.id_ts.its_otime |
87 | #define icmp_rtime icmp_dun.id_ts.its_rtime |
88 | #define icmp_ttime icmp_dun.id_ts.its_ttime |
89 | #define icmp_ip icmp_dun.id_ip.idi_ip |
90 | #define icmp_mask icmp_dun.id_mask |
91 | #define icmp_data icmp_dun.id_data |
92 | }; |
93 | |
94 | /* |
95 | * Lower bounds on packet lengths for various types. |
96 | * For the error advice packets must first ensure that the |
97 | * packet is large enough to contain the returned ip header. |
98 | * Only then can we do the check to see if 64 bits of packet |
99 | * data have been returned, since we need to check the returned |
100 | * ip header length. |
101 | */ |
102 | #define ICMP_MINLEN 8 /* abs minimum */ |
103 | #define ICMP_TSLEN (8 + 3 * sizeof(n_time)) /* timestamp */ |
104 | #define ICMP_MASKLEN 12 /* address mask */ |
105 | #define ICMP_ADVLENMIN (8 + sizeof(struct ip) + 8) /* min */ |
106 | #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8) |
107 | /* N.B.: must separately check that ip_hl >= 5 */ |
108 | |
109 | /* |
110 | * Definition of type and code field values. |
111 | */ |
112 | #define ICMP_ECHOREPLY 0 /* echo reply */ |
113 | #define ICMP_UNREACH 3 /* dest unreachable, codes: */ |
114 | #define ICMP_UNREACH_NET 0 /* bad net */ |
115 | #define ICMP_UNREACH_HOST 1 /* bad host */ |
116 | #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */ |
117 | #define ICMP_UNREACH_PORT 3 /* bad port */ |
118 | #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */ |
119 | #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */ |
120 | #define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */ |
121 | #define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */ |
122 | #define ICMP_UNREACH_ISOLATED 8 /* src host isolated */ |
123 | #define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */ |
124 | #define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */ |
125 | #define ICMP_UNREACH_TOSNET 11 /* bad tos for net */ |
126 | #define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */ |
127 | #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */ |
128 | #define ICMP_REDIRECT 5 /* shorter route, codes: */ |
129 | #define ICMP_REDIRECT_NET 0 /* for network */ |
130 | #define ICMP_REDIRECT_HOST 1 /* for host */ |
131 | #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */ |
132 | #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */ |
133 | #define ICMP_ECHO 8 /* echo service */ |
134 | #define ICMP_ROUTERADVERT 9 /* router advertisement */ |
135 | #define ICMP_ROUTERSOLICIT 10 /* router solicitation */ |
136 | #define ICMP_TIMXCEED 11 /* time exceeded, code: */ |
137 | #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */ |
138 | #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */ |
139 | #define ICMP_PARAMPROB 12 /* ip header bad */ |
140 | #define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */ |
141 | #define ICMP_TSTAMP 13 /* timestamp request */ |
142 | #define ICMP_TSTAMPREPLY 14 /* timestamp reply */ |
143 | #define ICMP_IREQ 15 /* information request */ |
144 | #define ICMP_IREQREPLY 16 /* information reply */ |
145 | #define ICMP_MASKREQ 17 /* address mask request */ |
146 | #define ICMP_MASKREPLY 18 /* address mask reply */ |
147 | |
148 | #define ICMP_MAXTYPE 18 |
149 | |
150 | #define ICMP_INFOTYPE(type) \ |
151 | ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \ |
152 | (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \ |
153 | (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \ |
154 | (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \ |
155 | (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY) |
156 | |
157 | void icmp_init(Slirp *slirp); |
158 | void icmp_cleanup(Slirp *slirp); |
159 | void icmp_input(struct mbuf *, int); |
160 | void icmp_send_error(struct mbuf *msrc, uint8_t type, uint8_t code, int minsize, |
161 | const char *message); |
162 | void icmp_reflect(struct mbuf *); |
163 | void icmp_receive(struct socket *so); |
164 | void icmp_detach(struct socket *so); |
165 | |
166 | #endif |
167 | |