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1 /* |
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2 * Copyright (c) 1982, 1986, 1993 |
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3 * The Regents of the University of California. All rights reserved. |
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4 * |
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5 * Redistribution and use in source and binary forms, with or without |
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6 * modification, are permitted provided that the following conditions |
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7 * are met: |
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8 * 1. Redistributions of source code must retain the above copyright |
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9 * notice, this list of conditions and the following disclaimer. |
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10 * 2. Redistributions in binary form must reproduce the above copyright |
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11 * notice, this list of conditions and the following disclaimer in the |
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12 * documentation and/or other materials provided with the distribution. |
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13 * 3. All advertising materials mentioning features or use of this software |
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14 * must display the following acknowledgement: |
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15 * This product includes software developed by the University of |
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16 * California, Berkeley and its contributors. |
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17 * 4. Neither the name of the University nor the names of its contributors |
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18 * may be used to endorse or promote products derived from this software |
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19 * without specific prior written permission. |
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20 * |
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21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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31 * SUCH DAMAGE. |
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32 * |
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33 * @(#)ip_icmp.h 8.1 (Berkeley) 6/10/93 |
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34 * ip_icmp.h,v 1.4 1995/05/30 08:09:43 rgrimes Exp |
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35 */ |
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36 |
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37 #ifndef _NETINET_IP_ICMP_H_ |
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38 #define _NETINET_IP_ICMP_H_ |
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39 |
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40 /* |
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41 * Interface Control Message Protocol Definitions. |
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42 * Per RFC 792, September 1981. |
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43 */ |
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44 |
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45 typedef u_int32_t n_time; |
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46 |
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47 /* |
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48 * Structure of an icmp header. |
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49 */ |
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50 struct icmp { |
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51 u_char icmp_type; /* type of message, see below */ |
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52 u_char icmp_code; /* type sub code */ |
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53 u_short icmp_cksum; /* ones complement cksum of struct */ |
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54 union { |
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55 u_char ih_pptr; /* ICMP_PARAMPROB */ |
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56 struct in_addr ih_gwaddr; /* ICMP_REDIRECT */ |
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57 struct ih_idseq { |
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58 u_short icd_id; |
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59 u_short icd_seq; |
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60 } ih_idseq; |
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61 int ih_void; |
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62 |
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63 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */ |
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64 struct ih_pmtu { |
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65 u_short ipm_void; |
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66 u_short ipm_nextmtu; |
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67 } ih_pmtu; |
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68 } icmp_hun; |
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69 #define icmp_pptr icmp_hun.ih_pptr |
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70 #define icmp_gwaddr icmp_hun.ih_gwaddr |
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71 #define icmp_id icmp_hun.ih_idseq.icd_id |
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72 #define icmp_seq icmp_hun.ih_idseq.icd_seq |
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73 #define icmp_void icmp_hun.ih_void |
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74 #define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void |
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75 #define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu |
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76 union { |
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77 struct id_ts { |
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78 n_time its_otime; |
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79 n_time its_rtime; |
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80 n_time its_ttime; |
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81 } id_ts; |
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82 struct id_ip { |
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83 struct ip idi_ip; |
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84 /* options and then 64 bits of data */ |
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85 } id_ip; |
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86 uint32_t id_mask; |
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87 char id_data[1]; |
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88 } icmp_dun; |
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89 #define icmp_otime icmp_dun.id_ts.its_otime |
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90 #define icmp_rtime icmp_dun.id_ts.its_rtime |
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91 #define icmp_ttime icmp_dun.id_ts.its_ttime |
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92 #define icmp_ip icmp_dun.id_ip.idi_ip |
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93 #define icmp_mask icmp_dun.id_mask |
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94 #define icmp_data icmp_dun.id_data |
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95 }; |
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96 |
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97 /* |
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98 * Lower bounds on packet lengths for various types. |
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99 * For the error advice packets must first insure that the |
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100 * packet is large enought to contain the returned ip header. |
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101 * Only then can we do the check to see if 64 bits of packet |
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102 * data have been returned, since we need to check the returned |
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103 * ip header length. |
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104 */ |
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105 #define ICMP_MINLEN 8 /* abs minimum */ |
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106 #define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */ |
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107 #define ICMP_MASKLEN 12 /* address mask */ |
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108 #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */ |
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109 #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8) |
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110 /* N.B.: must separately check that ip_hl >= 5 */ |
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111 |
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112 /* |
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113 * Definition of type and code field values. |
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114 */ |
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115 #define ICMP_ECHOREPLY 0 /* echo reply */ |
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116 #define ICMP_UNREACH 3 /* dest unreachable, codes: */ |
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117 #define ICMP_UNREACH_NET 0 /* bad net */ |
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118 #define ICMP_UNREACH_HOST 1 /* bad host */ |
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119 #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */ |
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120 #define ICMP_UNREACH_PORT 3 /* bad port */ |
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121 #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */ |
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122 #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */ |
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123 #define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */ |
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124 #define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */ |
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125 #define ICMP_UNREACH_ISOLATED 8 /* src host isolated */ |
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126 #define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */ |
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127 #define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */ |
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128 #define ICMP_UNREACH_TOSNET 11 /* bad tos for net */ |
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129 #define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */ |
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130 #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */ |
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131 #define ICMP_REDIRECT 5 /* shorter route, codes: */ |
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132 #define ICMP_REDIRECT_NET 0 /* for network */ |
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133 #define ICMP_REDIRECT_HOST 1 /* for host */ |
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134 #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */ |
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135 #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */ |
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136 #define ICMP_ECHO 8 /* echo service */ |
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137 #define ICMP_ROUTERADVERT 9 /* router advertisement */ |
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138 #define ICMP_ROUTERSOLICIT 10 /* router solicitation */ |
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139 #define ICMP_TIMXCEED 11 /* time exceeded, code: */ |
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140 #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */ |
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141 #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */ |
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142 #define ICMP_PARAMPROB 12 /* ip header bad */ |
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143 #define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */ |
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144 #define ICMP_TSTAMP 13 /* timestamp request */ |
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145 #define ICMP_TSTAMPREPLY 14 /* timestamp reply */ |
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146 #define ICMP_IREQ 15 /* information request */ |
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147 #define ICMP_IREQREPLY 16 /* information reply */ |
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148 #define ICMP_MASKREQ 17 /* address mask request */ |
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149 #define ICMP_MASKREPLY 18 /* address mask reply */ |
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150 |
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151 #define ICMP_MAXTYPE 18 |
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152 |
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153 #define ICMP_INFOTYPE(type) \ |
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154 ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \ |
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155 (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \ |
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156 (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \ |
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157 (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \ |
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158 (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY) |
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159 |
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160 void icmp_input _P((struct mbuf *, int)); |
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161 void icmp_error(struct mbuf *msrc, u_char type, u_char code, int minsize, |
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162 const char *message); |
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163 void icmp_reflect _P((struct mbuf *)); |
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164 |
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165 #endif |