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 | * 4. Neither the name of the University nor the names of its contributors |
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14 | * may be used to endorse or promote products derived from this software |
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15 | * without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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27 | * SUCH DAMAGE. |
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28 | * |
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29 | * @(#)ip.h 8.2 (Berkeley) 6/1/94 |
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30 | * $FreeBSD: src/sys/netinet/ip.h,v 1.29 2005/01/07 01:45:44 imp Exp $ |
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31 | */ |
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32 | |
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33 | /* |
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34 | * $Id$ |
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35 | */ |
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36 | |
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37 | #ifndef _NETINET_IP_H_ |
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38 | #define _NETINET_IP_H_ |
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39 | |
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40 | #include <sys/cdefs.h> |
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41 | |
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42 | /* |
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43 | * Definitions for internet protocol version 4. |
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44 | * Per RFC 791, September 1981. |
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45 | */ |
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46 | #define IPVERSION 4 |
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47 | |
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48 | #ifndef __packed |
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49 | #if defined(__GNUC__) |
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50 | #define __packed __attribute__((packed)) |
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51 | #else |
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52 | #define __packed |
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53 | #endif |
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54 | #endif |
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55 | |
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56 | /* |
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57 | * Structure of an internet header, naked of options. |
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58 | */ |
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59 | struct ip { |
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60 | #ifdef _IP_VHL |
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61 | u_char ip_vhl; /* version << 4 | header length >> 2 */ |
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62 | #else |
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63 | #if BYTE_ORDER == LITTLE_ENDIAN |
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64 | u_int ip_hl:4, /* header length */ |
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65 | ip_v:4; /* version */ |
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66 | #endif |
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67 | #if BYTE_ORDER == BIG_ENDIAN |
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68 | u_int ip_v:4, /* version */ |
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69 | ip_hl:4; /* header length */ |
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70 | #endif |
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71 | #endif /* not _IP_VHL */ |
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72 | u_char ip_tos; /* type of service */ |
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73 | u_short ip_len; /* total length */ |
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74 | u_short ip_id; /* identification */ |
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75 | u_short ip_off; /* fragment offset field */ |
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76 | #define IP_RF 0x8000 /* reserved fragment flag */ |
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77 | #define IP_DF 0x4000 /* dont fragment flag */ |
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78 | #define IP_MF 0x2000 /* more fragments flag */ |
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79 | #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ |
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80 | u_char ip_ttl; /* time to live */ |
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81 | u_char ip_p; /* protocol */ |
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82 | u_short ip_sum; /* checksum */ |
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83 | struct in_addr ip_src,ip_dst; /* source and dest address */ |
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84 | } __packed; |
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85 | |
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86 | #ifdef _IP_VHL |
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87 | #define IP_MAKE_VHL(v, hl) ((v) << 4 | (hl)) |
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88 | #define IP_VHL_HL(vhl) ((vhl) & 0x0f) |
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89 | #define IP_VHL_V(vhl) ((vhl) >> 4) |
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90 | #define IP_VHL_BORING 0x45 |
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91 | #endif |
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92 | |
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93 | #ifdef CTASSERT |
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94 | CTASSERT(sizeof (struct ip) == 20); |
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95 | #endif |
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96 | |
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97 | #define IP_MAXPACKET 65535 /* maximum packet size */ |
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98 | |
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99 | /* |
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100 | * Definitions for IP type of service (ip_tos) |
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101 | */ |
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102 | #define IPTOS_LOWDELAY 0x10 |
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103 | #define IPTOS_THROUGHPUT 0x08 |
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104 | #define IPTOS_RELIABILITY 0x04 |
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105 | #define IPTOS_MINCOST 0x02 |
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106 | #if 1 |
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107 | /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */ |
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108 | #define IPTOS_CE 0x01 |
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109 | #define IPTOS_ECT 0x02 |
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110 | #endif |
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111 | |
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112 | /* |
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113 | * Definitions for IP precedence (also in ip_tos) (hopefully unused) |
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114 | */ |
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115 | #define IPTOS_PREC_NETCONTROL 0xe0 |
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116 | #define IPTOS_PREC_INTERNETCONTROL 0xc0 |
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117 | #define IPTOS_PREC_CRITIC_ECP 0xa0 |
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118 | #define IPTOS_PREC_FLASHOVERRIDE 0x80 |
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119 | #define IPTOS_PREC_FLASH 0x60 |
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120 | #define IPTOS_PREC_IMMEDIATE 0x40 |
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121 | #define IPTOS_PREC_PRIORITY 0x20 |
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122 | #define IPTOS_PREC_ROUTINE 0x00 |
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123 | |
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124 | /* |
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125 | * ECN (Explicit Congestion Notification) codepoints in RFC3168 |
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126 | * mapped to the lower 2 bits of the TOS field. |
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127 | */ |
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128 | #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ |
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129 | #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ |
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130 | #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ |
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131 | #define IPTOS_ECN_CE 0x03 /* congestion experienced */ |
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132 | #define IPTOS_ECN_MASK 0x03 /* ECN field mask */ |
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133 | |
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134 | /* |
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135 | * Definitions for options. |
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136 | */ |
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137 | #define IPOPT_COPIED(o) ((o)&0x80) |
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138 | #define IPOPT_CLASS(o) ((o)&0x60) |
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139 | #define IPOPT_NUMBER(o) ((o)&0x1f) |
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140 | |
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141 | #define IPOPT_CONTROL 0x00 |
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142 | #define IPOPT_RESERVED1 0x20 |
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143 | #define IPOPT_DEBMEAS 0x40 |
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144 | #define IPOPT_RESERVED2 0x60 |
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145 | |
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146 | #define IPOPT_EOL 0 /* end of option list */ |
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147 | #define IPOPT_NOP 1 /* no operation */ |
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148 | |
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149 | #define IPOPT_RR 7 /* record packet route */ |
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150 | #define IPOPT_TS 68 /* timestamp */ |
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151 | #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ |
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152 | #define IPOPT_LSRR 131 /* loose source route */ |
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153 | #define IPOPT_ESO 133 /* extended security */ |
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154 | #define IPOPT_CIPSO 134 /* commerical security */ |
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155 | #define IPOPT_SATID 136 /* satnet id */ |
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156 | #define IPOPT_SSRR 137 /* strict source route */ |
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157 | #define IPOPT_RA 148 /* router alert */ |
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158 | |
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159 | /* |
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160 | * Offsets to fields in options other than EOL and NOP. |
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161 | */ |
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162 | #define IPOPT_OPTVAL 0 /* option ID */ |
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163 | #define IPOPT_OLEN 1 /* option length */ |
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164 | #define IPOPT_OFFSET 2 /* offset within option */ |
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165 | #define IPOPT_MINOFF 4 /* min value of above */ |
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166 | |
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167 | /* |
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168 | * Time stamp option structure. |
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169 | */ |
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170 | struct ip_timestamp { |
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171 | u_char ipt_code; /* IPOPT_TS */ |
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172 | u_char ipt_len; /* size of structure (variable) */ |
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173 | u_char ipt_ptr; /* index of current entry */ |
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174 | #if BYTE_ORDER == LITTLE_ENDIAN |
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175 | u_int ipt_flg:4, /* flags, see below */ |
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176 | ipt_oflw:4; /* overflow counter */ |
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177 | #endif |
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178 | #if BYTE_ORDER == BIG_ENDIAN |
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179 | u_int ipt_oflw:4, /* overflow counter */ |
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180 | ipt_flg:4; /* flags, see below */ |
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181 | #endif |
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182 | union ipt_timestamp { |
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183 | n_long ipt_time[1]; |
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184 | struct ipt_ta { |
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185 | struct in_addr ipt_addr; |
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186 | n_long ipt_time; |
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187 | } ipt_ta[1]; |
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188 | } ipt_timestamp; |
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189 | }; |
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190 | |
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191 | #include <machine/in_cksum.h> |
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192 | |
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193 | /* flag bits for ipt_flg */ |
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194 | #define IPOPT_TS_TSONLY 0 /* timestamps only */ |
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195 | #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ |
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196 | #define IPOPT_TS_PRESPEC 3 /* specified modules only */ |
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197 | |
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198 | /* bits for security (not byte swapped) */ |
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199 | #define IPOPT_SECUR_UNCLASS 0x0000 |
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200 | #define IPOPT_SECUR_CONFID 0xf135 |
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201 | #define IPOPT_SECUR_EFTO 0x789a |
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202 | #define IPOPT_SECUR_MMMM 0xbc4d |
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203 | #define IPOPT_SECUR_RESTR 0xaf13 |
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204 | #define IPOPT_SECUR_SECRET 0xd788 |
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205 | #define IPOPT_SECUR_TOPSECRET 0x6bc5 |
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206 | |
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207 | /* |
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208 | * Internet implementation parameters. |
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209 | */ |
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210 | #define MAXTTL 255 /* maximum time to live (seconds) */ |
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211 | #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ |
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212 | #define IPFRAGTTL 60 /* time to live for frags, slowhz */ |
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213 | #define IPTTLDEC 1 /* subtracted when forwarding */ |
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214 | |
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215 | #define IP_MSS 576 /* default maximum segment size */ |
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216 | |
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217 | /* |
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218 | * This is the real IPv4 pseudo header, used for computing the TCP and UDP |
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219 | * checksums. For the Internet checksum, struct ipovly can be used instead. |
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220 | * For stronger checksums, the real thing must be used. |
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221 | */ |
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222 | struct ippseudo { |
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223 | struct in_addr ippseudo_src; /* source internet address */ |
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224 | struct in_addr ippseudo_dst; /* destination internet address */ |
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225 | u_char ippseudo_pad; /* pad, must be zero */ |
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226 | u_char ippseudo_p; /* protocol */ |
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227 | u_short ippseudo_len; /* protocol length */ |
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228 | }; |
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229 | #endif |
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