1 | /* $KAME: ip6opt.c,v 1.13 2003/06/06 10:08:20 suz Exp $ */ |
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2 | |
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3 | /* |
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4 | * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. |
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5 | * All rights reserved. |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions |
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9 | * are met: |
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10 | * 1. Redistributions of source code must retain the above copyright |
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11 | * notice, this list of conditions and the following disclaimer. |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * 3. Neither the name of the project nor the names of its contributors |
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16 | * may be used to endorse or promote products derived from this software |
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17 | * without specific prior written permission. |
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18 | * |
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19 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
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20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
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23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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29 | * SUCH DAMAGE. |
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30 | */ |
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31 | |
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32 | #include <sys/cdefs.h> |
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33 | __FBSDID("$FreeBSD$"); |
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34 | |
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35 | #include <rtems/bsd/sys/param.h> |
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36 | #include <rtems/bsd/sys/types.h> |
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37 | #include <sys/socket.h> |
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38 | |
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39 | #include <netinet/in.h> |
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40 | #include <netinet/ip6.h> |
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41 | |
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42 | #include <string.h> |
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43 | #include <stdio.h> |
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44 | |
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45 | static int ip6optlen(u_int8_t *opt, u_int8_t *lim); |
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46 | static void inet6_insert_padopt(u_char *p, int len); |
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47 | |
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48 | /* |
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49 | * This function returns the number of bytes required to hold an option |
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50 | * when it is stored as ancillary data, including the cmsghdr structure |
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51 | * at the beginning, and any padding at the end (to make its size a |
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52 | * multiple of 8 bytes). The argument is the size of the structure |
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53 | * defining the option, which must include any pad bytes at the |
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54 | * beginning (the value y in the alignment term "xn + y"), the type |
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55 | * byte, the length byte, and the option data. |
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56 | */ |
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57 | int |
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58 | inet6_option_space(int nbytes) |
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59 | { |
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60 | nbytes += 2; /* we need space for nxt-hdr and length fields */ |
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61 | return(CMSG_SPACE((nbytes + 7) & ~7)); |
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62 | } |
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63 | |
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64 | /* |
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65 | * This function is called once per ancillary data object that will |
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66 | * contain either Hop-by-Hop or Destination options. It returns 0 on |
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67 | * success or -1 on an error. |
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68 | */ |
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69 | int |
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70 | inet6_option_init(void *bp, struct cmsghdr **cmsgp, int type) |
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71 | { |
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72 | struct cmsghdr *ch = (struct cmsghdr *)bp; |
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73 | |
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74 | /* argument validation */ |
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75 | if (type != IPV6_HOPOPTS && type != IPV6_DSTOPTS) |
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76 | return(-1); |
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77 | |
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78 | ch->cmsg_level = IPPROTO_IPV6; |
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79 | ch->cmsg_type = type; |
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80 | ch->cmsg_len = CMSG_LEN(0); |
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81 | |
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82 | *cmsgp = ch; |
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83 | return(0); |
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84 | } |
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85 | |
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86 | /* |
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87 | * This function appends a Hop-by-Hop option or a Destination option |
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88 | * into an ancillary data object that has been initialized by |
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89 | * inet6_option_init(). This function returns 0 if it succeeds or -1 on |
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90 | * an error. |
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91 | * multx is the value x in the alignment term "xn + y" described |
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92 | * earlier. It must have a value of 1, 2, 4, or 8. |
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93 | * plusy is the value y in the alignment term "xn + y" described |
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94 | * earlier. It must have a value between 0 and 7, inclusive. |
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95 | */ |
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96 | int |
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97 | inet6_option_append(struct cmsghdr *cmsg, const u_int8_t *typep, int multx, |
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98 | int plusy) |
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99 | { |
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100 | int padlen, optlen, off; |
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101 | u_char *bp = (u_char *)cmsg + cmsg->cmsg_len; |
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102 | struct ip6_ext *eh = (struct ip6_ext *)CMSG_DATA(cmsg); |
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103 | |
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104 | /* argument validation */ |
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105 | if (multx != 1 && multx != 2 && multx != 4 && multx != 8) |
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106 | return(-1); |
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107 | if (plusy < 0 || plusy > 7) |
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108 | return(-1); |
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109 | |
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110 | /* |
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111 | * If this is the first option, allocate space for the |
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112 | * first 2 bytes(for next header and length fields) of |
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113 | * the option header. |
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114 | */ |
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115 | if (bp == (u_char *)eh) { |
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116 | bp += 2; |
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117 | cmsg->cmsg_len += 2; |
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118 | } |
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119 | |
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120 | /* calculate pad length before the option. */ |
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121 | off = bp - (u_char *)eh; |
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122 | padlen = (((off % multx) + (multx - 1)) & ~(multx - 1)) - |
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123 | (off % multx); |
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124 | padlen += plusy; |
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125 | padlen %= multx; /* keep the pad as short as possible */ |
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126 | /* insert padding */ |
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127 | inet6_insert_padopt(bp, padlen); |
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128 | cmsg->cmsg_len += padlen; |
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129 | bp += padlen; |
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130 | |
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131 | /* copy the option */ |
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132 | if (typep[0] == IP6OPT_PAD1) |
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133 | optlen = 1; |
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134 | else |
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135 | optlen = typep[1] + 2; |
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136 | memcpy(bp, typep, optlen); |
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137 | bp += optlen; |
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138 | cmsg->cmsg_len += optlen; |
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139 | |
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140 | /* calculate pad length after the option and insert the padding */ |
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141 | off = bp - (u_char *)eh; |
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142 | padlen = ((off + 7) & ~7) - off; |
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143 | inet6_insert_padopt(bp, padlen); |
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144 | bp += padlen; |
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145 | cmsg->cmsg_len += padlen; |
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146 | |
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147 | /* update the length field of the ip6 option header */ |
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148 | eh->ip6e_len = ((bp - (u_char *)eh) >> 3) - 1; |
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149 | |
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150 | return(0); |
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151 | } |
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152 | |
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153 | /* |
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154 | * This function appends a Hop-by-Hop option or a Destination option |
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155 | * into an ancillary data object that has been initialized by |
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156 | * inet6_option_init(). This function returns a pointer to the 8-bit |
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157 | * option type field that starts the option on success, or NULL on an |
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158 | * error. |
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159 | * The difference between this function and inet6_option_append() is |
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160 | * that the latter copies the contents of a previously built option into |
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161 | * the ancillary data object while the current function returns a |
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162 | * pointer to the space in the data object where the option's TLV must |
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163 | * then be built by the caller. |
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164 | * |
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165 | */ |
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166 | u_int8_t * |
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167 | inet6_option_alloc(struct cmsghdr *cmsg, int datalen, int multx, int plusy) |
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168 | { |
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169 | int padlen, off; |
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170 | u_int8_t *bp = (u_char *)cmsg + cmsg->cmsg_len; |
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171 | u_int8_t *retval; |
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172 | struct ip6_ext *eh = (struct ip6_ext *)CMSG_DATA(cmsg); |
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173 | |
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174 | /* argument validation */ |
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175 | if (multx != 1 && multx != 2 && multx != 4 && multx != 8) |
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176 | return(NULL); |
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177 | if (plusy < 0 || plusy > 7) |
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178 | return(NULL); |
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179 | |
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180 | /* |
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181 | * If this is the first option, allocate space for the |
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182 | * first 2 bytes(for next header and length fields) of |
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183 | * the option header. |
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184 | */ |
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185 | if (bp == (u_char *)eh) { |
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186 | bp += 2; |
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187 | cmsg->cmsg_len += 2; |
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188 | } |
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189 | |
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190 | /* calculate pad length before the option. */ |
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191 | off = bp - (u_char *)eh; |
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192 | padlen = (((off % multx) + (multx - 1)) & ~(multx - 1)) - |
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193 | (off % multx); |
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194 | padlen += plusy; |
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195 | padlen %= multx; /* keep the pad as short as possible */ |
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196 | /* insert padding */ |
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197 | inet6_insert_padopt(bp, padlen); |
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198 | cmsg->cmsg_len += padlen; |
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199 | bp += padlen; |
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200 | |
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201 | /* keep space to store specified length of data */ |
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202 | retval = bp; |
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203 | bp += datalen; |
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204 | cmsg->cmsg_len += datalen; |
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205 | |
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206 | /* calculate pad length after the option and insert the padding */ |
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207 | off = bp - (u_char *)eh; |
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208 | padlen = ((off + 7) & ~7) - off; |
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209 | inet6_insert_padopt(bp, padlen); |
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210 | bp += padlen; |
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211 | cmsg->cmsg_len += padlen; |
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212 | |
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213 | /* update the length field of the ip6 option header */ |
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214 | eh->ip6e_len = ((bp - (u_char *)eh) >> 3) - 1; |
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215 | |
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216 | return(retval); |
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217 | } |
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218 | |
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219 | /* |
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220 | * This function processes the next Hop-by-Hop option or Destination |
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221 | * option in an ancillary data object. If another option remains to be |
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222 | * processed, the return value of the function is 0 and *tptrp points to |
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223 | * the 8-bit option type field (which is followed by the 8-bit option |
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224 | * data length, followed by the option data). If no more options remain |
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225 | * to be processed, the return value is -1 and *tptrp is NULL. If an |
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226 | * error occurs, the return value is -1 and *tptrp is not NULL. |
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227 | * (RFC 2292, 6.3.5) |
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228 | */ |
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229 | int |
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230 | inet6_option_next(const struct cmsghdr *cmsg, u_int8_t **tptrp) |
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231 | { |
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232 | struct ip6_ext *ip6e; |
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233 | int hdrlen, optlen; |
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234 | u_int8_t *lim; |
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235 | |
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236 | if (cmsg->cmsg_level != IPPROTO_IPV6 || |
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237 | (cmsg->cmsg_type != IPV6_HOPOPTS && |
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238 | cmsg->cmsg_type != IPV6_DSTOPTS)) |
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239 | return(-1); |
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240 | |
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241 | /* message length validation */ |
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242 | if (cmsg->cmsg_len < CMSG_SPACE(sizeof(struct ip6_ext))) |
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243 | return(-1); |
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244 | ip6e = (struct ip6_ext *)CMSG_DATA(cmsg); |
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245 | hdrlen = (ip6e->ip6e_len + 1) << 3; |
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246 | if (cmsg->cmsg_len < CMSG_SPACE(hdrlen)) |
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247 | return(-1); |
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248 | |
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249 | /* |
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250 | * If the caller does not specify the starting point, |
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251 | * simply return the 1st option. |
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252 | * Otherwise, search the option list for the next option. |
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253 | */ |
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254 | lim = (u_int8_t *)ip6e + hdrlen; |
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255 | if (*tptrp == NULL) |
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256 | *tptrp = (u_int8_t *)(ip6e + 1); |
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257 | else { |
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258 | if ((optlen = ip6optlen(*tptrp, lim)) == 0) |
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259 | return(-1); |
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260 | |
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261 | *tptrp = *tptrp + optlen; |
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262 | } |
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263 | if (*tptrp >= lim) { /* there is no option */ |
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264 | *tptrp = NULL; |
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265 | return(-1); |
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266 | } |
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267 | /* |
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268 | * Finally, checks if the next option is safely stored in the |
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269 | * cmsg data. |
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270 | */ |
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271 | if (ip6optlen(*tptrp, lim) == 0) |
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272 | return(-1); |
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273 | else |
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274 | return(0); |
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275 | } |
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276 | |
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277 | /* |
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278 | * This function is similar to the inet6_option_next() function, |
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279 | * except this function lets the caller specify the option type to be |
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280 | * searched for, instead of always returning the next option in the |
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281 | * ancillary data object. |
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282 | * Note: RFC 2292 says the type of tptrp is u_int8_t *, but we think |
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283 | * it's a typo. The variable should be type of u_int8_t **. |
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284 | */ |
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285 | int |
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286 | inet6_option_find(const struct cmsghdr *cmsg, u_int8_t **tptrp, int type) |
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287 | { |
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288 | struct ip6_ext *ip6e; |
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289 | int hdrlen, optlen; |
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290 | u_int8_t *optp, *lim; |
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291 | |
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292 | if (cmsg->cmsg_level != IPPROTO_IPV6 || |
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293 | (cmsg->cmsg_type != IPV6_HOPOPTS && |
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294 | cmsg->cmsg_type != IPV6_DSTOPTS)) |
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295 | return(-1); |
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296 | |
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297 | /* message length validation */ |
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298 | if (cmsg->cmsg_len < CMSG_SPACE(sizeof(struct ip6_ext))) |
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299 | return(-1); |
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300 | ip6e = (struct ip6_ext *)CMSG_DATA(cmsg); |
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301 | hdrlen = (ip6e->ip6e_len + 1) << 3; |
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302 | if (cmsg->cmsg_len < CMSG_SPACE(hdrlen)) |
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303 | return(-1); |
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304 | |
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305 | /* |
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306 | * If the caller does not specify the starting point, |
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307 | * search from the beginning of the option list. |
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308 | * Otherwise, search from *the next option* of the specified point. |
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309 | */ |
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310 | lim = (u_int8_t *)ip6e + hdrlen; |
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311 | if (*tptrp == NULL) |
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312 | *tptrp = (u_int8_t *)(ip6e + 1); |
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313 | else { |
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314 | if ((optlen = ip6optlen(*tptrp, lim)) == 0) |
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315 | return(-1); |
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316 | |
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317 | *tptrp = *tptrp + optlen; |
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318 | } |
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319 | for (optp = *tptrp; optp < lim; optp += optlen) { |
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320 | if (*optp == type) { |
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321 | *tptrp = optp; |
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322 | return(0); |
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323 | } |
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324 | if ((optlen = ip6optlen(optp, lim)) == 0) |
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325 | return(-1); |
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326 | } |
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327 | |
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328 | /* search failed */ |
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329 | *tptrp = NULL; |
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330 | return(-1); |
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331 | } |
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332 | |
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333 | /* |
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334 | * Calculate the length of a given IPv6 option. Also checks |
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335 | * if the option is safely stored in user's buffer according to the |
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336 | * calculated length and the limitation of the buffer. |
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337 | */ |
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338 | static int |
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339 | ip6optlen(u_int8_t *opt, u_int8_t *lim) |
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340 | { |
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341 | int optlen; |
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342 | |
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343 | if (*opt == IP6OPT_PAD1) |
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344 | optlen = 1; |
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345 | else { |
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346 | /* is there enough space to store type and len? */ |
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347 | if (opt + 2 > lim) |
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348 | return(0); |
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349 | optlen = *(opt + 1) + 2; |
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350 | } |
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351 | if (opt + optlen <= lim) |
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352 | return(optlen); |
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353 | |
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354 | return(0); |
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355 | } |
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356 | |
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357 | static void |
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358 | inet6_insert_padopt(u_char *p, int len) |
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359 | { |
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360 | switch(len) { |
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361 | case 0: |
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362 | return; |
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363 | case 1: |
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364 | p[0] = IP6OPT_PAD1; |
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365 | return; |
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366 | default: |
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367 | p[0] = IP6OPT_PADN; |
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368 | p[1] = len - 2; |
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369 | memset(&p[2], 0, len - 2); |
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370 | return; |
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371 | } |
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372 | } |
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373 | |
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374 | /* |
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375 | * The following functions are defined in RFC3542, which is a successor |
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376 | * of RFC2292. |
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377 | */ |
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378 | |
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379 | int |
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380 | inet6_opt_init(void *extbuf, socklen_t extlen) |
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381 | { |
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382 | struct ip6_ext *ext = (struct ip6_ext *)extbuf; |
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383 | |
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384 | if (extlen < 0 || (extlen % 8)) |
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385 | return(-1); |
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386 | |
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387 | if (ext) { |
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388 | if (extlen == 0) |
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389 | return(-1); |
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390 | ext->ip6e_len = (extlen >> 3) - 1; |
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391 | } |
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392 | |
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393 | return(2); /* sizeof the next and the length fields */ |
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394 | } |
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395 | |
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396 | int |
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397 | inet6_opt_append(void *extbuf, socklen_t extlen, int offset, u_int8_t type, |
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398 | socklen_t len, u_int8_t align, void **databufp) |
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399 | { |
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400 | int currentlen = offset, padlen = 0; |
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401 | |
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402 | /* |
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403 | * The option type must have a value from 2 to 255, inclusive. |
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404 | * (0 and 1 are reserved for the Pad1 and PadN options, respectively.) |
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405 | */ |
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406 | if (type < 2) |
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407 | return(-1); |
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408 | |
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409 | /* |
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410 | * The option data length must have a value between 0 and 255, |
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411 | * inclusive, and is the length of the option data that follows. |
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412 | */ |
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413 | if (len < 0 || len > 255) |
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414 | return(-1); |
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415 | |
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416 | /* |
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417 | * The align parameter must have a value of 1, 2, 4, or 8. |
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418 | * The align value can not exceed the value of len. |
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419 | */ |
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420 | if (align != 1 && align != 2 && align != 4 && align != 8) |
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421 | return(-1); |
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422 | if (align > len) |
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423 | return(-1); |
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424 | |
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425 | /* Calculate the padding length. */ |
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426 | currentlen += 2 + len; /* 2 means "type + len" */ |
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427 | if (currentlen % align) |
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428 | padlen = align - (currentlen % align); |
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429 | |
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430 | /* The option must fit in the extension header buffer. */ |
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431 | currentlen += padlen; |
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432 | if (extlen && /* XXX: right? */ |
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433 | currentlen > extlen) |
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434 | return(-1); |
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435 | |
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436 | if (extbuf) { |
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437 | u_int8_t *optp = (u_int8_t *)extbuf + offset; |
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438 | |
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439 | if (padlen == 1) { |
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440 | /* insert a Pad1 option */ |
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441 | *optp = IP6OPT_PAD1; |
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442 | optp++; |
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443 | } |
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444 | else if (padlen > 0) { |
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445 | /* insert a PadN option for alignment */ |
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446 | *optp++ = IP6OPT_PADN; |
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447 | *optp++ = padlen - 2; |
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448 | memset(optp, 0, padlen - 2); |
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449 | optp += (padlen - 2); |
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450 | } |
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451 | |
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452 | *optp++ = type; |
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453 | *optp++ = len; |
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454 | |
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455 | *databufp = optp; |
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456 | } |
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457 | |
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458 | return(currentlen); |
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459 | } |
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460 | |
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461 | int |
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462 | inet6_opt_finish(void *extbuf, socklen_t extlen, int offset) |
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463 | { |
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464 | int updatelen = offset > 0 ? (1 + ((offset - 1) | 7)) : 0;; |
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465 | |
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466 | if (extbuf) { |
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467 | u_int8_t *padp; |
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468 | int padlen = updatelen - offset; |
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469 | |
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470 | if (updatelen > extlen) |
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471 | return(-1); |
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472 | |
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473 | padp = (u_int8_t *)extbuf + offset; |
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474 | if (padlen == 1) |
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475 | *padp = IP6OPT_PAD1; |
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476 | else if (padlen > 0) { |
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477 | *padp++ = IP6OPT_PADN; |
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478 | *padp++ = (padlen - 2); |
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479 | memset(padp, 0, padlen - 2); |
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480 | } |
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481 | } |
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482 | |
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483 | return(updatelen); |
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484 | } |
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485 | |
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486 | int |
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487 | inet6_opt_set_val(void *databuf, int offset, void *val, socklen_t vallen) |
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488 | { |
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489 | |
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490 | memcpy((u_int8_t *)databuf + offset, val, vallen); |
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491 | return(offset + vallen); |
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492 | } |
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493 | |
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494 | int |
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495 | inet6_opt_next(void *extbuf, socklen_t extlen, int offset, u_int8_t *typep, |
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496 | socklen_t *lenp, void **databufp) |
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497 | { |
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498 | u_int8_t *optp, *lim; |
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499 | int optlen; |
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500 | |
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501 | /* Validate extlen. XXX: is the variable really necessary?? */ |
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502 | if (extlen == 0 || (extlen % 8)) |
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503 | return(-1); |
---|
504 | lim = (u_int8_t *)extbuf + extlen; |
---|
505 | |
---|
506 | /* |
---|
507 | * If this is the first time this function called for this options |
---|
508 | * header, simply return the 1st option. |
---|
509 | * Otherwise, search the option list for the next option. |
---|
510 | */ |
---|
511 | if (offset == 0) { |
---|
512 | optp = (u_int8_t *)((struct ip6_hbh *)extbuf + 1); |
---|
513 | } |
---|
514 | else |
---|
515 | optp = (u_int8_t *)extbuf + offset; |
---|
516 | |
---|
517 | /* Find the next option skipping any padding options. */ |
---|
518 | while(optp < lim) { |
---|
519 | switch(*optp) { |
---|
520 | case IP6OPT_PAD1: |
---|
521 | optp++; |
---|
522 | break; |
---|
523 | case IP6OPT_PADN: |
---|
524 | if ((optlen = ip6optlen(optp, lim)) == 0) |
---|
525 | goto optend; |
---|
526 | optp += optlen; |
---|
527 | break; |
---|
528 | default: /* found */ |
---|
529 | if ((optlen = ip6optlen(optp, lim)) == 0) |
---|
530 | goto optend; |
---|
531 | *typep = *optp; |
---|
532 | *lenp = optlen - 2; |
---|
533 | *databufp = optp + 2; |
---|
534 | return(optp + optlen - (u_int8_t *)extbuf); |
---|
535 | } |
---|
536 | } |
---|
537 | |
---|
538 | optend: |
---|
539 | *databufp = NULL; /* for safety */ |
---|
540 | return(-1); |
---|
541 | } |
---|
542 | |
---|
543 | int |
---|
544 | inet6_opt_find(void *extbuf, socklen_t extlen, int offset, u_int8_t type, |
---|
545 | socklen_t *lenp, void **databufp) |
---|
546 | { |
---|
547 | u_int8_t *optp, *lim; |
---|
548 | int optlen; |
---|
549 | |
---|
550 | /* Validate extlen. XXX: is the variable really necessary?? */ |
---|
551 | if (extlen == 0 || (extlen % 8)) |
---|
552 | return(-1); |
---|
553 | lim = (u_int8_t *)extbuf + extlen; |
---|
554 | |
---|
555 | /* |
---|
556 | * If this is the first time this function called for this options |
---|
557 | * header, simply return the 1st option. |
---|
558 | * Otherwise, search the option list for the next option. |
---|
559 | */ |
---|
560 | if (offset == 0) { |
---|
561 | optp = (u_int8_t *)((struct ip6_hbh *)extbuf + 1); |
---|
562 | } |
---|
563 | else |
---|
564 | optp = (u_int8_t *)extbuf + offset; |
---|
565 | |
---|
566 | /* Find the specified option */ |
---|
567 | while(optp < lim) { |
---|
568 | if ((optlen = ip6optlen(optp, lim)) == 0) |
---|
569 | goto optend; |
---|
570 | |
---|
571 | if (*optp == type) { /* found */ |
---|
572 | *lenp = optlen - 2; |
---|
573 | *databufp = optp + 2; |
---|
574 | return(optp + optlen - (u_int8_t *)extbuf); |
---|
575 | } |
---|
576 | |
---|
577 | optp += optlen; |
---|
578 | } |
---|
579 | |
---|
580 | optend: |
---|
581 | *databufp = NULL; /* for safety */ |
---|
582 | return(-1); |
---|
583 | } |
---|
584 | |
---|
585 | int |
---|
586 | inet6_opt_get_val(void *databuf, int offset, void *val, socklen_t vallen) |
---|
587 | { |
---|
588 | |
---|
589 | /* we can't assume alignment here */ |
---|
590 | memcpy(val, (u_int8_t *)databuf + offset, vallen); |
---|
591 | |
---|
592 | return(offset + vallen); |
---|
593 | } |
---|