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1 /* IP.H |
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2 * |
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3 * Portions Copyright (c) 1997-1999 Nokia Corporation and/or its subsidiary(-ies). |
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4 * All rights reserved. |
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5 */ |
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6 |
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7 /** @file |
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8 @publishedAll |
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9 @released |
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10 */ |
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11 |
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12 /* |
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13 * Copyright (c) 1982, 1986 Regents of the University of California. |
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14 * All rights reserved. |
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15 * |
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16 * Redistribution and use in source and binary forms are permitted |
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17 * provided that this notice is preserved and that due credit is given |
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18 * to the University of California at Berkeley. The name of the University |
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19 * may not be used to endorse or promote products derived from this |
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20 * software without specific prior written permission. This software |
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21 * is provided ``as is'' without express or implied warranty. |
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22 */ |
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23 |
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24 /* |
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25 * Definitions for internet protocol version 4. |
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26 * Per RFC 791, September 1981. |
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27 */ |
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28 |
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29 #ifndef _NETINET_IP_H |
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30 #define _NETINET_IP_H |
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31 |
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32 #ifdef __cplusplus |
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33 extern "C" { |
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34 #endif |
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35 |
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36 #define IPVERSION 4 |
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37 |
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38 /** |
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39 Structure of an internet header, naked of options. |
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40 |
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41 We declare ip_len and ip_off to be short, rather than u_short |
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42 pragmatically since otherwise unsigned comparisons can result |
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43 against negative integers quite easily, and fail in subtle ways. |
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44 */ |
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45 struct ip { |
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46 #ifdef _BIT_FIELDS_LTOH |
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47 u_char ip_hl:4, /* header length */ |
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48 ip_v:4; /* version */ |
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49 #else |
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50 u_char ip_v:4, /* version */ |
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51 ip_hl:4; /* header length */ |
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52 #endif |
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53 u_char ip_tos; /* type of service */ |
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54 short ip_len; /* total length */ |
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55 u_short ip_id; /* identification */ |
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56 short ip_off; /* fragment offset field */ |
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57 #define IP_DF 0x4000 /* dont fragment flag */ |
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58 #define IP_MF 0x2000 /* more fragments flag */ |
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59 u_char ip_ttl; /* time to live */ |
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60 u_char ip_p; /* protocol */ |
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61 u_short ip_sum; /* checksum */ |
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62 struct in_addr ip_src, ip_dst; /* source and dest address */ |
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63 }; |
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64 |
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65 #define IP_MAXPACKET 65535 /* maximum packet size */ |
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66 |
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67 /** |
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68 Definitions for IP type of service (ip_tos) |
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69 */ |
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70 #define IPTOS_LOWDELAY 0x10 |
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71 #define IPTOS_THROUGHPUT 0x08 |
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72 #define IPTOS_RELIABILITY 0x04 |
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73 |
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74 /** |
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75 Definitions for IP precedence (also in ip_tos) (hopefully unused) |
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76 */ |
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77 #define IPTOS_PREC_NETCONTROL 0xe0 |
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78 #define IPTOS_PREC_INTERNETCONTROL 0xc0 |
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79 #define IPTOS_PREC_CRITIC_ECP 0xa0 |
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80 #define IPTOS_PREC_FLASHOVERRIDE 0x80 |
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81 #define IPTOS_PREC_FLASH 0x60 |
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82 #define IPTOS_PREC_IMMEDIATE 0x40 |
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83 #define IPTOS_PREC_PRIORITY 0x20 |
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84 #define IPTOS_PREC_ROUTINE 0x00 |
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85 |
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86 /** |
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87 Definitions for options. |
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88 */ |
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89 #define IPOPT_COPIED(o) ((o)&0x80) |
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90 #define IPOPT_CLASS(o) ((o)&0x60) |
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91 #define IPOPT_NUMBER(o) ((o)&0x1f) |
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92 |
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93 #define IPOPT_CONTROL 0x00 |
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94 #define IPOPT_RESERVED1 0x20 |
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95 #define IPOPT_DEBMEAS 0x40 |
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96 #define IPOPT_RESERVED2 0x60 |
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97 |
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98 #define IPOPT_EOL 0 /* end of option list */ |
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99 #define IPOPT_NOP 1 /* no operation */ |
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100 |
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101 #define IPOPT_RR 7 /* record packet route */ |
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102 #define IPOPT_TS 68 /* timestamp */ |
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103 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ |
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104 #define IPOPT_LSRR 131 /* loose source route */ |
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105 #define IPOPT_SATID 136 /* satnet id */ |
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106 #define IPOPT_SSRR 137 /* strict source route */ |
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107 |
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108 /** |
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109 Offsets to fields in options other than EOL and NOP. |
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110 */ |
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111 #define IPOPT_OPTVAL 0 /* option ID */ |
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112 #define IPOPT_OLEN 1 /* option length */ |
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113 #define IPOPT_OFFSET 2 /* offset within option */ |
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114 #define IPOPT_MINOFF 4 /* min value of above */ |
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115 |
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116 /** |
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117 Time stamp option structure. |
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118 */ |
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119 struct ip_timestamp { |
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120 u_char ipt_code; /* IPOPT_TS */ |
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121 u_char ipt_len; /* size of structure (variable) */ |
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122 u_char ipt_ptr; /* index of current entry */ |
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123 #ifdef _BIT_FIELDS_LTOH |
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124 u_char ipt_flg:4, /* flags, see below */ |
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125 ipt_oflw:4; /* overflow counter */ |
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126 #else |
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127 u_char ipt_oflw:4, /* overflow counter */ |
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128 ipt_flg:4; /* flags, see below */ |
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129 #endif |
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130 union ipt_timestamp { |
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131 n_long ipt_time[1]; |
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132 struct ipt_ta { |
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133 struct in_addr ipt_addr; |
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134 n_long ipt_time; |
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135 } ipt_ta[1]; |
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136 } ipt_timestamp; |
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137 }; |
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138 |
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139 /** |
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140 flag bits for ipt_flg |
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141 */ |
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142 #define IPOPT_TS_TSONLY 0 /* timestamps only */ |
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143 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ |
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144 #define IPOPT_TS_PRESPEC 2 /* specified modules only */ |
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145 |
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146 /** |
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147 bits for security (not byte swapped) |
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148 */ |
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149 #define IPOPT_SECUR_UNCLASS 0x0000 |
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150 #define IPOPT_SECUR_CONFID 0xf135 |
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151 #define IPOPT_SECUR_EFTO 0x789a |
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152 #define IPOPT_SECUR_MMMM 0xbc4d |
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153 #define IPOPT_SECUR_RESTR 0xaf13 |
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154 #define IPOPT_SECUR_SECRET 0xd788 |
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155 #define IPOPT_SECUR_TOPSECRET 0x6bc5 |
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156 |
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157 /** |
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158 Internet implementation parameters. |
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159 */ |
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160 #define MAXTTL 255 /* maximum time to live (seconds) */ |
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161 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ |
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162 #define IPTTLDEC 1 /* subtracted when forwarding */ |
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163 |
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164 #define IP_MSS 576 /* default maximum segment size */ |
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165 |
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166 #ifdef __cplusplus |
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167 } |
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168 #endif |
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169 |
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170 #endif /* _NETINET_IP_H */ |