1 /* 2 * Copyright 2003 Sun Microsystems, Inc. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Sun designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Sun in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 22 * CA 95054 USA or visit www.sun.com if you need additional information or 23 * have any questions. 24 */ 25 26 #ifndef ICMP_H 27 #define ICMP_H 28 29 /* 30 * Structure of an internet header, naked of options. 31 * 32 * We declare ip_len and ip_off to be short, rather than ushort_t 33 * pragmatically since otherwise unsigned comparisons can result 34 * against negative integers quite easily, and fail in subtle ways. 35 */ 36 struct ip { 37 unsigned char ip_hl:4, /* header length */ 38 ip_v:4; /* version */ 39 unsigned char ip_tos; /* type of service */ 40 short ip_len; /* total length */ 41 unsigned short ip_id; /* identification */ 42 short ip_off; /* fragment offset field */ 43 #define IP_DF 0x4000 /* dont fragment flag */ 44 #define IP_MF 0x2000 /* more fragments flag */ 45 unsigned char ip_ttl; /* time to live */ 46 unsigned char ip_p; /* protocol */ 47 unsigned short ip_sum; /* checksum */ 48 struct in_addr ip_src, ip_dst; /* source and dest address */ 49 }; 50 51 /* 52 * Structure of an icmp header. 53 */ 54 struct icmp { 55 unsigned char icmp_type; /* type of message, see below */ 56 unsigned char icmp_code; /* type sub code */ 57 unsigned short icmp_cksum; /* ones complement cksum of struct */ 58 union { 59 unsigned char ih_pptr; /* ICMP_PARAMPROB */ 60 struct in_addr ih_gwaddr; /* ICMP_REDIRECT */ 61 struct ih_idseq { 62 unsigned short icd_id; 63 unsigned short icd_seq; 64 } ih_idseq; 65 int ih_void; 66 67 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */ 68 struct ih_pmtu { 69 unsigned short ipm_void; 70 unsigned short ipm_nextmtu; 71 } ih_pmtu; 72 73 struct ih_rtradv { 74 unsigned char irt_num_addrs; 75 unsigned char irt_wpa; 76 unsigned short irt_lifetime; 77 } ih_rtradv; 78 } icmp_hun; 79 #define icmp_pptr icmp_hun.ih_pptr 80 #define icmp_gwaddr icmp_hun.ih_gwaddr 81 #define icmp_id icmp_hun.ih_idseq.icd_id 82 #define icmp_seq icmp_hun.ih_idseq.icd_seq 83 #define icmp_void icmp_hun.ih_void 84 #define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void 85 #define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu 86 union { 87 struct id_ts { 88 unsigned int its_otime; 89 unsigned int its_rtime; 90 unsigned int its_ttime; 91 } id_ts; 92 struct id_ip { 93 struct ip idi_ip; 94 /* options and then 64 bits of data */ 95 } id_ip; 96 unsigned int id_mask; 97 char 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_mask icmp_dun.id_mask 104 #define icmp_data icmp_dun.id_data 105 }; 106 107 #define ICMP_ECHOREPLY 0 /* echo reply */ 108 #define ICMP_ECHO 8 /* echo service */ 109 110 #ifdef USE_IPV6 111 112 /* 113 * ICMPv6 structures & constants 114 */ 115 116 typedef struct icmp6_hdr { 117 u_char icmp6_type; /* type field */ 118 u_char icmp6_code; /* code field */ 119 u_short icmp6_cksum; /* checksum field */ 120 union { 121 u_int icmp6_un_data32[1]; /* type-specific field */ 122 u_short icmp6_un_data16[2]; /* type-specific field */ 123 u_char icmp6_un_data8[4]; /* type-specific field */ 124 } icmp6_dataun; 125 } icmp6_t; 126 127 #define icmp6_data32 icmp6_dataun.icmp6_un_data32 128 #define icmp6_data16 icmp6_dataun.icmp6_un_data16 129 #define icmp6_data8 icmp6_dataun.icmp6_un_data8 130 #define icmp6_pptr icmp6_data32[0] /* parameter prob */ 131 #define icmp6_mtu icmp6_data32[0] /* packet too big */ 132 #define icmp6_id icmp6_data16[0] /* echo request/reply */ 133 #define icmp6_seq icmp6_data16[1] /* echo request/reply */ 134 #define icmp6_maxdelay icmp6_data16[0] /* mcast group membership */ 135 136 struct ip6_pseudo_hdr /* for calculate the ICMPv6 checksum */ 137 { 138 struct in6_addr ip6_src; 139 struct in6_addr ip6_dst; 140 u_int ip6_plen; 141 u_int ip6_nxt; 142 }; 143 144 #define ICMP6_ECHO_REQUEST 128 145 #define ICMP6_ECHO_REPLY 129 146 #define IPPROTO_ICMPV6 58 147 #define IPV6_UNICAST_HOPS 4 /* Set/get IP unicast hop limit */ 148 149 #endif // USE_IPV6 150 151 #endif 152