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