1 | /* $KAME: rthdr.c,v 1.19 2003/06/06 10:48:51 itojun 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 | /* |
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46 | * RFC2292 API |
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47 | */ |
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48 | |
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49 | size_t |
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50 | inet6_rthdr_space(type, seg) |
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51 | int type, seg; |
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52 | { |
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53 | switch (type) { |
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54 | case IPV6_RTHDR_TYPE_0: |
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55 | if (seg < 1 || seg > 23) |
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56 | return (0); |
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57 | #ifdef COMPAT_RFC2292 |
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58 | return (CMSG_SPACE(sizeof(struct in6_addr) * (seg - 1) + |
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59 | sizeof(struct ip6_rthdr0))); |
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60 | #else |
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61 | return (CMSG_SPACE(sizeof(struct in6_addr) * seg + |
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62 | sizeof(struct ip6_rthdr0))); |
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63 | #endif |
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64 | default: |
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65 | return (0); |
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66 | } |
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67 | } |
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68 | |
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69 | struct cmsghdr * |
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70 | inet6_rthdr_init(bp, type) |
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71 | void *bp; |
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72 | int type; |
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73 | { |
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74 | struct cmsghdr *ch = (struct cmsghdr *)bp; |
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75 | struct ip6_rthdr *rthdr; |
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76 | |
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77 | rthdr = (struct ip6_rthdr *)CMSG_DATA(ch); |
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78 | |
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79 | ch->cmsg_level = IPPROTO_IPV6; |
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80 | ch->cmsg_type = IPV6_RTHDR; |
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81 | |
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82 | switch (type) { |
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83 | case IPV6_RTHDR_TYPE_0: |
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84 | #ifdef COMPAT_RFC2292 |
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85 | ch->cmsg_len = CMSG_LEN(sizeof(struct ip6_rthdr0) - |
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86 | sizeof(struct in6_addr)); |
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87 | #else |
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88 | ch->cmsg_len = CMSG_LEN(sizeof(struct ip6_rthdr0)); |
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89 | #endif |
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90 | |
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91 | bzero(rthdr, sizeof(struct ip6_rthdr0)); |
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92 | rthdr->ip6r_type = IPV6_RTHDR_TYPE_0; |
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93 | return (ch); |
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94 | default: |
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95 | return (NULL); |
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96 | } |
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97 | } |
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98 | |
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99 | /* ARGSUSED */ |
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100 | int |
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101 | inet6_rthdr_add(cmsg, addr, flags) |
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102 | struct cmsghdr *cmsg; |
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103 | const struct in6_addr *addr; |
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104 | u_int flags; |
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105 | { |
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106 | struct ip6_rthdr *rthdr; |
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107 | |
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108 | rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg); |
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109 | |
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110 | switch (rthdr->ip6r_type) { |
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111 | case IPV6_RTHDR_TYPE_0: |
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112 | { |
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113 | struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr; |
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114 | if (flags != IPV6_RTHDR_LOOSE && flags != IPV6_RTHDR_STRICT) |
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115 | return (-1); |
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116 | if (rt0->ip6r0_segleft == 23) |
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117 | return (-1); |
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118 | |
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119 | #ifdef COMPAT_RFC1883 /* XXX */ |
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120 | if (flags == IPV6_RTHDR_STRICT) { |
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121 | int c, b; |
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122 | c = rt0->ip6r0_segleft / 8; |
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123 | b = rt0->ip6r0_segleft % 8; |
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124 | rt0->ip6r0_slmap[c] |= (1 << (7 - b)); |
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125 | } |
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126 | #else |
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127 | if (flags != IPV6_RTHDR_LOOSE) |
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128 | return (-1); |
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129 | #endif |
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130 | rt0->ip6r0_segleft++; |
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131 | bcopy(addr, (caddr_t)rt0 + ((rt0->ip6r0_len + 1) << 3), |
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132 | sizeof(struct in6_addr)); |
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133 | rt0->ip6r0_len += sizeof(struct in6_addr) >> 3; |
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134 | cmsg->cmsg_len = CMSG_LEN((rt0->ip6r0_len + 1) << 3); |
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135 | break; |
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136 | } |
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137 | default: |
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138 | return (-1); |
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139 | } |
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140 | |
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141 | return (0); |
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142 | } |
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143 | |
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144 | /* ARGSUSED */ |
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145 | int |
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146 | inet6_rthdr_lasthop(cmsg, flags) |
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147 | struct cmsghdr *cmsg; |
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148 | unsigned int flags; |
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149 | { |
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150 | struct ip6_rthdr *rthdr; |
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151 | |
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152 | rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg); |
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153 | |
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154 | switch (rthdr->ip6r_type) { |
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155 | case IPV6_RTHDR_TYPE_0: |
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156 | { |
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157 | struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr; |
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158 | #ifdef COMPAT_RFC1883 /* XXX */ |
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159 | if (flags != IPV6_RTHDR_LOOSE && flags != IPV6_RTHDR_STRICT) |
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160 | return (-1); |
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161 | #endif /* COMPAT_RFC1883 */ |
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162 | if (rt0->ip6r0_segleft > 23) |
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163 | return (-1); |
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164 | #ifdef COMPAT_RFC1883 /* XXX */ |
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165 | if (flags == IPV6_RTHDR_STRICT) { |
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166 | int c, b; |
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167 | c = rt0->ip6r0_segleft / 8; |
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168 | b = rt0->ip6r0_segleft % 8; |
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169 | rt0->ip6r0_slmap[c] |= (1 << (7 - b)); |
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170 | } |
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171 | #else |
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172 | if (flags != IPV6_RTHDR_LOOSE) |
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173 | return (-1); |
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174 | #endif /* COMPAT_RFC1883 */ |
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175 | break; |
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176 | } |
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177 | default: |
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178 | return (-1); |
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179 | } |
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180 | |
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181 | return (0); |
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182 | } |
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183 | |
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184 | #if 0 |
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185 | int |
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186 | inet6_rthdr_reverse(in, out) |
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187 | const struct cmsghdr *in; |
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188 | struct cmsghdr *out; |
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189 | { |
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190 | |
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191 | return (-1); |
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192 | } |
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193 | #endif |
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194 | |
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195 | int |
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196 | inet6_rthdr_segments(cmsg) |
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197 | const struct cmsghdr *cmsg; |
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198 | { |
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199 | struct ip6_rthdr *rthdr; |
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200 | |
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201 | rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg); |
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202 | |
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203 | switch (rthdr->ip6r_type) { |
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204 | case IPV6_RTHDR_TYPE_0: |
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205 | { |
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206 | struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr; |
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207 | |
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208 | if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len) |
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209 | return (-1); |
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210 | |
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211 | return (rt0->ip6r0_len * 8) / sizeof(struct in6_addr); |
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212 | } |
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213 | |
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214 | default: |
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215 | return (-1); |
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216 | } |
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217 | } |
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218 | |
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219 | struct in6_addr * |
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220 | inet6_rthdr_getaddr(cmsg, idx) |
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221 | struct cmsghdr *cmsg; |
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222 | int idx; |
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223 | { |
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224 | struct ip6_rthdr *rthdr; |
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225 | |
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226 | rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg); |
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227 | |
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228 | switch (rthdr->ip6r_type) { |
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229 | case IPV6_RTHDR_TYPE_0: |
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230 | { |
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231 | struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr; |
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232 | int naddr; |
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233 | |
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234 | if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len) |
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235 | return NULL; |
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236 | naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr); |
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237 | if (idx <= 0 || naddr < idx) |
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238 | return NULL; |
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239 | #ifdef COMPAT_RFC2292 |
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240 | return (((struct in6_addr *)(rt0 + 1)) + idx - 1); |
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241 | #else |
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242 | return (((struct in6_addr *)(rt0 + 1)) + idx); |
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243 | #endif |
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244 | } |
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245 | |
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246 | default: |
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247 | return NULL; |
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248 | } |
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249 | } |
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250 | |
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251 | int |
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252 | inet6_rthdr_getflags(cmsg, idx) |
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253 | const struct cmsghdr *cmsg; |
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254 | int idx; |
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255 | { |
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256 | struct ip6_rthdr *rthdr; |
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257 | |
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258 | rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg); |
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259 | |
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260 | switch (rthdr->ip6r_type) { |
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261 | case IPV6_RTHDR_TYPE_0: |
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262 | { |
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263 | struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr; |
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264 | int naddr; |
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265 | |
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266 | if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len) |
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267 | return (-1); |
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268 | naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr); |
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269 | if (idx < 0 || naddr < idx) |
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270 | return (-1); |
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271 | #ifdef COMPAT_RFC1883 /* XXX */ |
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272 | if (rt0->ip6r0_slmap[idx / 8] & (0x80 >> (idx % 8))) |
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273 | return IPV6_RTHDR_STRICT; |
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274 | else |
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275 | return IPV6_RTHDR_LOOSE; |
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276 | #else |
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277 | return IPV6_RTHDR_LOOSE; |
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278 | #endif /* COMPAT_RFC1883 */ |
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279 | } |
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280 | |
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281 | default: |
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282 | return (-1); |
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283 | } |
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284 | } |
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285 | |
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286 | /* |
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287 | * RFC3542 API |
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288 | */ |
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289 | |
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290 | socklen_t |
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291 | inet6_rth_space(int type, int segments) |
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292 | { |
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293 | switch (type) { |
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294 | case IPV6_RTHDR_TYPE_0: |
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295 | if ((segments >= 0) && (segments <= 127)) |
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296 | return (((segments * 2) + 1) << 3); |
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297 | /* FALLTHROUGH */ |
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298 | default: |
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299 | return (0); /* type not suppported */ |
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300 | } |
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301 | } |
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302 | |
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303 | void * |
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304 | inet6_rth_init(void *bp, socklen_t bp_len, int type, int segments) |
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305 | { |
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306 | struct ip6_rthdr *rth = (struct ip6_rthdr *)bp; |
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307 | struct ip6_rthdr0 *rth0; |
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308 | |
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309 | switch (type) { |
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310 | case IPV6_RTHDR_TYPE_0: |
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311 | /* length validation */ |
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312 | if (bp_len < inet6_rth_space(IPV6_RTHDR_TYPE_0, segments)) |
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313 | return (NULL); |
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314 | /* segment validation */ |
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315 | if ((segments < 0) || (segments > 127)) |
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316 | return (NULL); |
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317 | |
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318 | memset(bp, 0, bp_len); |
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319 | rth0 = (struct ip6_rthdr0 *)rth; |
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320 | rth0->ip6r0_len = segments * 2; |
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321 | rth0->ip6r0_type = IPV6_RTHDR_TYPE_0; |
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322 | rth0->ip6r0_segleft = 0; |
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323 | rth0->ip6r0_reserved = 0; |
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324 | break; |
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325 | default: |
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326 | return (NULL); /* type not supported */ |
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327 | } |
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328 | |
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329 | return (bp); |
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330 | } |
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331 | |
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332 | int |
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333 | inet6_rth_add(void *bp, const struct in6_addr *addr) |
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334 | { |
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335 | struct ip6_rthdr *rth = (struct ip6_rthdr *)bp; |
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336 | struct ip6_rthdr0 *rth0; |
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337 | struct in6_addr *nextaddr; |
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338 | |
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339 | switch (rth->ip6r_type) { |
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340 | case IPV6_RTHDR_TYPE_0: |
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341 | rth0 = (struct ip6_rthdr0 *)rth; |
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342 | /* Don't exceed the number of stated segments */ |
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343 | if (rth0->ip6r0_segleft == (rth0->ip6r0_len / 2)) |
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344 | return (-1); |
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345 | nextaddr = (struct in6_addr *)(rth0 + 1) + rth0->ip6r0_segleft; |
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346 | *nextaddr = *addr; |
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347 | rth0->ip6r0_segleft++; |
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348 | break; |
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349 | default: |
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350 | return (-1); /* type not supported */ |
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351 | } |
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352 | |
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353 | return (0); |
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354 | } |
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355 | |
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356 | int |
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357 | inet6_rth_reverse(const void *in, void *out) |
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358 | { |
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359 | struct ip6_rthdr *rth_in = (struct ip6_rthdr *)in; |
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360 | struct ip6_rthdr0 *rth0_in, *rth0_out; |
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361 | int i, segments; |
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362 | |
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363 | switch (rth_in->ip6r_type) { |
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364 | case IPV6_RTHDR_TYPE_0: |
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365 | rth0_in = (struct ip6_rthdr0 *)in; |
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366 | rth0_out = (struct ip6_rthdr0 *)out; |
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367 | |
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368 | /* parameter validation XXX too paranoid? */ |
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369 | if (rth0_in->ip6r0_len % 2) |
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370 | return (-1); |
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371 | segments = rth0_in->ip6r0_len / 2; |
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372 | |
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373 | /* we can't use memcpy here, since in and out may overlap */ |
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374 | memmove((void *)rth0_out, (void *)rth0_in, |
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375 | ((rth0_in->ip6r0_len) + 1) << 3); |
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376 | rth0_out->ip6r0_segleft = segments; |
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377 | |
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378 | /* reverse the addresses */ |
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379 | for (i = 0; i < segments / 2; i++) { |
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380 | struct in6_addr addr_tmp, *addr1, *addr2; |
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381 | |
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382 | addr1 = (struct in6_addr *)(rth0_out + 1) + i; |
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383 | addr2 = (struct in6_addr *)(rth0_out + 1) + |
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384 | (segments - i - 1); |
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385 | addr_tmp = *addr1; |
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386 | *addr1 = *addr2; |
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387 | *addr2 = addr_tmp; |
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388 | } |
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389 | |
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390 | break; |
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391 | default: |
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392 | return (-1); /* type not supported */ |
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393 | } |
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394 | |
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395 | return (0); |
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396 | } |
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397 | |
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398 | int |
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399 | inet6_rth_segments(const void *bp) |
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400 | { |
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401 | struct ip6_rthdr *rh = (struct ip6_rthdr *)bp; |
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402 | struct ip6_rthdr0 *rh0; |
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403 | int addrs; |
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404 | |
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405 | switch (rh->ip6r_type) { |
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406 | case IPV6_RTHDR_TYPE_0: |
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407 | rh0 = (struct ip6_rthdr0 *)bp; |
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408 | |
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409 | /* |
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410 | * Validation for a type-0 routing header. |
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411 | * Is this too strict? |
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412 | */ |
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413 | if ((rh0->ip6r0_len % 2) != 0 || |
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414 | (addrs = (rh0->ip6r0_len >> 1)) < rh0->ip6r0_segleft) |
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415 | return (-1); |
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416 | |
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417 | return (addrs); |
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418 | default: |
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419 | return (-1); /* unknown type */ |
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420 | } |
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421 | } |
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422 | |
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423 | struct in6_addr * |
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424 | inet6_rth_getaddr(const void *bp, int idx) |
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425 | { |
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426 | struct ip6_rthdr *rh = (struct ip6_rthdr *)bp; |
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427 | struct ip6_rthdr0 *rh0; |
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428 | int addrs; |
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429 | |
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430 | switch (rh->ip6r_type) { |
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431 | case IPV6_RTHDR_TYPE_0: |
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432 | rh0 = (struct ip6_rthdr0 *)bp; |
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433 | |
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434 | /* |
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435 | * Validation for a type-0 routing header. |
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436 | * Is this too strict? |
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437 | */ |
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438 | if ((rh0->ip6r0_len % 2) != 0 || |
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439 | (addrs = (rh0->ip6r0_len >> 1)) < rh0->ip6r0_segleft) |
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440 | return (NULL); |
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441 | |
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442 | if (idx < 0 || addrs <= idx) |
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443 | return (NULL); |
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444 | |
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445 | return (((struct in6_addr *)(rh0 + 1)) + idx); |
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446 | default: |
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447 | return (NULL); /* unknown type */ |
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448 | break; |
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449 | } |
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450 | } |
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