1 | /* $NetBSD: nattraversal.c,v 1.14 2011/03/14 17:18:13 tteras Exp $ */ |
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2 | |
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3 | /* |
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4 | * Copyright (C) 2004 SuSE Linux AG, Nuernberg, Germany. |
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5 | * Contributed by: Michal Ludvig <mludvig@suse.cz>, SUSE Labs |
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6 | * All rights reserved. |
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7 | * |
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8 | * Redistribution and use in source and binary forms, with or without |
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9 | * modification, are permitted provided that the following conditions |
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10 | * are met: |
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11 | * 1. Redistributions of source code must retain the above copyright |
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12 | * notice, this list of conditions and the following disclaimer. |
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13 | * 2. Redistributions in binary form must reproduce the above copyright |
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14 | * notice, this list of conditions and the following disclaimer in the |
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15 | * documentation and/or other materials provided with the distribution. |
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16 | * 3. Neither the name of the project nor the names of its contributors |
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17 | * may be used to endorse or promote products derived from this software |
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18 | * without specific prior written permission. |
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19 | * |
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20 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
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21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
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24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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30 | * SUCH DAMAGE. |
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31 | */ |
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32 | |
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33 | #include "config.h" |
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34 | |
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35 | #include <sys/types.h> |
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36 | #include <sys/param.h> |
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37 | |
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38 | #ifdef __linux__ |
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39 | #include <linux/udp.h> |
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40 | #endif |
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41 | #if defined(__NetBSD__) || defined (__FreeBSD__) |
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42 | #include <netinet/udp.h> |
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43 | #endif |
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44 | |
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45 | #include <stdlib.h> |
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46 | #include <stdio.h> |
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47 | #include <string.h> |
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48 | #include <errno.h> |
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49 | #include <ctype.h> |
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50 | |
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51 | #include "var.h" |
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52 | #include "misc.h" |
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53 | #include "vmbuf.h" |
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54 | #include "plog.h" |
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55 | #include "debug.h" |
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56 | |
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57 | #include "localconf.h" |
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58 | #include "remoteconf.h" |
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59 | #include "sockmisc.h" |
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60 | #include "isakmp_var.h" |
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61 | #include "isakmp.h" |
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62 | #include "oakley.h" |
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63 | #include "ipsec_doi.h" |
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64 | #include "vendorid.h" |
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65 | #include "handler.h" |
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66 | #include "crypto_openssl.h" |
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67 | #include "schedule.h" |
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68 | #include "nattraversal.h" |
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69 | #include "grabmyaddr.h" |
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70 | |
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71 | struct natt_ka_addrs { |
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72 | struct sockaddr *src; |
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73 | struct sockaddr *dst; |
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74 | unsigned in_use; |
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75 | |
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76 | TAILQ_ENTRY(natt_ka_addrs) chain; |
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77 | }; |
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78 | |
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79 | static TAILQ_HEAD(_natt_ka_addrs, natt_ka_addrs) ka_tree; |
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80 | static struct sched sc_natt = SCHED_INITIALIZER(); |
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81 | |
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82 | /* |
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83 | * check if the given vid is NAT-T. |
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84 | */ |
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85 | int |
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86 | natt_vendorid (int vid) |
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87 | { |
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88 | return ( |
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89 | #ifdef ENABLE_NATT_00 |
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90 | vid == VENDORID_NATT_00 || |
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91 | #endif |
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92 | #ifdef ENABLE_NATT_01 |
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93 | vid == VENDORID_NATT_01 || |
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94 | #endif |
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95 | #ifdef ENABLE_NATT_02 |
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96 | vid == VENDORID_NATT_02 || |
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97 | vid == VENDORID_NATT_02_N || |
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98 | #endif |
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99 | #ifdef ENABLE_NATT_03 |
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100 | vid == VENDORID_NATT_03 || |
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101 | #endif |
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102 | #ifdef ENABLE_NATT_04 |
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103 | vid == VENDORID_NATT_04 || |
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104 | #endif |
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105 | #ifdef ENABLE_NATT_05 |
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106 | vid == VENDORID_NATT_05 || |
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107 | #endif |
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108 | #ifdef ENABLE_NATT_06 |
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109 | vid == VENDORID_NATT_06 || |
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110 | #endif |
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111 | #ifdef ENABLE_NATT_07 |
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112 | vid == VENDORID_NATT_07 || |
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113 | #endif |
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114 | #ifdef ENABLE_NATT_08 |
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115 | vid == VENDORID_NATT_08 || |
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116 | #endif |
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117 | /* Always enable NATT RFC if ENABLE_NATT |
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118 | */ |
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119 | vid == VENDORID_NATT_RFC); |
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120 | } |
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121 | |
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122 | vchar_t * |
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123 | natt_hash_addr (struct ph1handle *iph1, struct sockaddr *addr) |
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124 | { |
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125 | vchar_t *natd; |
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126 | vchar_t *buf; |
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127 | char *ptr; |
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128 | void *addr_ptr, *addr_port; |
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129 | size_t buf_size, addr_size; |
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130 | int natt_force = 0; |
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131 | |
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132 | if (iph1->rmconf != NULL && iph1->rmconf->nat_traversal == NATT_FORCE) |
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133 | natt_force = 1; |
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134 | |
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135 | plog (LLV_INFO, LOCATION, addr, "Hashing %s with algo #%d %s\n", |
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136 | saddr2str(addr), iph1->approval->hashtype, |
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137 | natt_force?"(NAT-T forced)":""); |
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138 | |
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139 | if (addr->sa_family == AF_INET) { |
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140 | addr_size = sizeof (struct in_addr); /* IPv4 address */ |
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141 | addr_ptr = &((struct sockaddr_in *)addr)->sin_addr; |
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142 | addr_port = &((struct sockaddr_in *)addr)->sin_port; |
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143 | } |
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144 | else if (addr->sa_family == AF_INET6) { |
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145 | addr_size = sizeof (struct in6_addr); /* IPv6 address */ |
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146 | addr_ptr = &((struct sockaddr_in6 *)addr)->sin6_addr; |
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147 | addr_port = &((struct sockaddr_in6 *)addr)->sin6_port; |
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148 | } |
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149 | else { |
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150 | plog (LLV_ERROR, LOCATION, addr, "Unsupported address family #0x%x\n", addr->sa_family); |
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151 | return NULL; |
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152 | } |
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153 | |
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154 | buf_size = 2 * sizeof (cookie_t); /* CKY-I + CKY+R */ |
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155 | buf_size += addr_size + 2; /* Address + Port */ |
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156 | |
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157 | if ((buf = vmalloc (buf_size)) == NULL) |
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158 | return NULL; |
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159 | |
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160 | ptr = buf->v; |
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161 | |
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162 | /* Copy-in CKY-I */ |
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163 | memcpy (ptr, iph1->index.i_ck, sizeof (cookie_t)); |
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164 | ptr += sizeof (cookie_t); |
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165 | |
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166 | /* Copy-in CKY-I */ |
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167 | memcpy (ptr, iph1->index.r_ck, sizeof (cookie_t)); |
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168 | ptr += sizeof (cookie_t); |
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169 | |
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170 | /* Copy-in Address (or zeroes if NATT_FORCE) */ |
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171 | if (natt_force) |
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172 | memset (ptr, 0, addr_size); |
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173 | else |
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174 | memcpy (ptr, addr_ptr, addr_size); |
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175 | ptr += addr_size; |
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176 | |
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177 | /* Copy-in Port number */ |
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178 | memcpy (ptr, addr_port, 2); |
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179 | |
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180 | natd = oakley_hash (buf, iph1); |
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181 | vfree(buf); |
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182 | |
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183 | return natd; |
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184 | } |
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185 | |
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186 | int |
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187 | natt_compare_addr_hash (struct ph1handle *iph1, vchar_t *natd_received, |
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188 | int natd_seq) |
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189 | { |
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190 | vchar_t *natd_computed; |
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191 | u_int32_t flag; |
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192 | int verified = 0; |
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193 | |
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194 | if (iph1->rmconf != NULL && |
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195 | iph1->rmconf->nat_traversal == NATT_FORCE) |
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196 | return verified; |
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197 | |
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198 | if (natd_seq == 0) { |
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199 | natd_computed = natt_hash_addr (iph1, iph1->local); |
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200 | flag = NAT_DETECTED_ME; |
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201 | } |
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202 | else { |
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203 | natd_computed = natt_hash_addr (iph1, iph1->remote); |
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204 | flag = NAT_DETECTED_PEER; |
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205 | } |
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206 | |
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207 | if (natd_computed == NULL) { |
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208 | plog(LLV_ERROR, LOCATION, NULL, "natd_computed allocation failed\n"); |
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209 | return verified; /* XXX should abort */ |
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210 | } |
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211 | |
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212 | if (natd_received->l == natd_computed->l && |
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213 | memcmp (natd_received->v, natd_computed->v, natd_received->l) == 0) { |
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214 | iph1->natt_flags &= ~flag; |
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215 | verified = 1; |
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216 | } |
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217 | |
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218 | vfree (natd_computed); |
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219 | |
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220 | return verified; |
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221 | } |
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222 | |
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223 | int |
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224 | natt_udp_encap (int encmode) |
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225 | { |
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226 | return (encmode == IPSECDOI_ATTR_ENC_MODE_UDPTUNNEL_RFC || |
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227 | encmode == IPSECDOI_ATTR_ENC_MODE_UDPTRNS_RFC || |
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228 | encmode == IPSECDOI_ATTR_ENC_MODE_UDPTUNNEL_DRAFT || |
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229 | encmode == IPSECDOI_ATTR_ENC_MODE_UDPTRNS_DRAFT); |
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230 | } |
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231 | |
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232 | int |
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233 | natt_fill_options (struct ph1natt_options *opts, int version) |
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234 | { |
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235 | if (! opts) |
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236 | return -1; |
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237 | |
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238 | opts->version = version; |
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239 | |
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240 | switch (version) { |
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241 | case VENDORID_NATT_00: |
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242 | case VENDORID_NATT_01: |
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243 | opts->float_port = 0; /* No port floating for those drafts */ |
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244 | opts->payload_nat_d = ISAKMP_NPTYPE_NATD_DRAFT; |
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245 | opts->payload_nat_oa = ISAKMP_NPTYPE_NATOA_DRAFT; |
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246 | opts->mode_udp_tunnel = IPSECDOI_ATTR_ENC_MODE_UDPTUNNEL_DRAFT; |
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247 | opts->mode_udp_transport = IPSECDOI_ATTR_ENC_MODE_UDPTRNS_DRAFT; |
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248 | opts->encaps_type = UDP_ENCAP_ESPINUDP_NON_IKE; |
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249 | break; |
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250 | |
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251 | case VENDORID_NATT_02: |
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252 | case VENDORID_NATT_02_N: |
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253 | case VENDORID_NATT_03: |
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254 | opts->float_port = lcconf->port_isakmp_natt; |
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255 | opts->payload_nat_d = ISAKMP_NPTYPE_NATD_DRAFT; |
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256 | opts->payload_nat_oa = ISAKMP_NPTYPE_NATOA_DRAFT; |
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257 | opts->mode_udp_tunnel = IPSECDOI_ATTR_ENC_MODE_UDPTUNNEL_DRAFT; |
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258 | opts->mode_udp_transport = IPSECDOI_ATTR_ENC_MODE_UDPTRNS_DRAFT; |
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259 | opts->encaps_type = UDP_ENCAP_ESPINUDP; |
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260 | break; |
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261 | case VENDORID_NATT_04: |
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262 | case VENDORID_NATT_05: |
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263 | case VENDORID_NATT_06: |
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264 | case VENDORID_NATT_07: |
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265 | case VENDORID_NATT_08: |
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266 | opts->float_port = lcconf->port_isakmp_natt; |
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267 | opts->payload_nat_d = ISAKMP_NPTYPE_NATD_BADDRAFT; |
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268 | opts->payload_nat_oa = ISAKMP_NPTYPE_NATOA_BADDRAFT; |
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269 | opts->mode_udp_tunnel = IPSECDOI_ATTR_ENC_MODE_UDPTUNNEL_RFC; |
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270 | opts->mode_udp_transport = IPSECDOI_ATTR_ENC_MODE_UDPTRNS_RFC; |
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271 | opts->encaps_type = UDP_ENCAP_ESPINUDP; |
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272 | break; |
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273 | case VENDORID_NATT_RFC: |
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274 | opts->float_port = lcconf->port_isakmp_natt; |
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275 | opts->payload_nat_d = ISAKMP_NPTYPE_NATD_RFC; |
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276 | opts->payload_nat_oa = ISAKMP_NPTYPE_NATOA_RFC; |
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277 | opts->mode_udp_tunnel = IPSECDOI_ATTR_ENC_MODE_UDPTUNNEL_RFC; |
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278 | opts->mode_udp_transport = IPSECDOI_ATTR_ENC_MODE_UDPTRNS_RFC; |
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279 | opts->encaps_type = UDP_ENCAP_ESPINUDP; |
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280 | break; |
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281 | default: |
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282 | plog(LLV_ERROR, LOCATION, NULL, |
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283 | "unsupported NAT-T version: %s\n", |
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284 | vid_string_by_id(version)); |
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285 | return -1; |
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286 | } |
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287 | |
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288 | opts->mode_udp_diff = opts->mode_udp_tunnel - IPSECDOI_ATTR_ENC_MODE_TUNNEL; |
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289 | |
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290 | return 0; |
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291 | } |
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292 | |
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293 | void |
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294 | natt_float_ports (struct ph1handle *iph1) |
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295 | { |
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296 | if (! (iph1->natt_flags & NAT_DETECTED) ) |
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297 | return; |
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298 | if (! iph1->natt_options->float_port){ |
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299 | /* Drafts 00 / 01, just schedule keepalive */ |
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300 | natt_keepalive_add_ph1 (iph1); |
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301 | return; |
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302 | } |
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303 | |
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304 | set_port (iph1->local, iph1->natt_options->float_port); |
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305 | set_port (iph1->remote, iph1->natt_options->float_port); |
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306 | iph1->natt_flags |= NAT_PORTS_CHANGED | NAT_ADD_NON_ESP_MARKER; |
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307 | |
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308 | natt_keepalive_add_ph1 (iph1); |
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309 | } |
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310 | |
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311 | static int |
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312 | natt_is_enabled (struct remoteconf *rmconf, void *args) |
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313 | { |
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314 | if (rmconf->nat_traversal) |
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315 | return 1; |
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316 | return 0; |
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317 | } |
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318 | |
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319 | void |
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320 | natt_handle_vendorid (struct ph1handle *iph1, int vid_numeric) |
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321 | { |
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322 | if (iph1->rmconf == NULL) { |
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323 | /* Check if any candidate remote conf allows nat-t */ |
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324 | struct rmconfselector rmconf; |
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325 | rmconf_selector_from_ph1(&rmconf, iph1); |
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326 | if (enumrmconf(&rmconf, natt_is_enabled, NULL) == 0) |
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327 | return; |
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328 | } else { |
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329 | if (!iph1->rmconf->nat_traversal) |
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330 | return; |
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331 | } |
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332 | |
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333 | if (! iph1->natt_options) |
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334 | iph1->natt_options = racoon_calloc (1, sizeof (*iph1->natt_options)); |
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335 | |
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336 | if (! iph1->natt_options) { |
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337 | plog (LLV_ERROR, LOCATION, NULL, |
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338 | "Allocating memory for natt_options failed!\n"); |
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339 | return; |
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340 | } |
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341 | |
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342 | if (iph1->natt_options->version < vid_numeric) |
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343 | if (natt_fill_options (iph1->natt_options, vid_numeric) == 0) |
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344 | iph1->natt_flags |= NAT_ANNOUNCED; |
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345 | } |
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346 | |
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347 | static void |
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348 | natt_keepalive_delete (struct natt_ka_addrs *ka) |
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349 | { |
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350 | TAILQ_REMOVE (&ka_tree, ka, chain); |
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351 | racoon_free (ka->src); |
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352 | racoon_free (ka->dst); |
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353 | racoon_free (ka); |
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354 | } |
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355 | |
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356 | /* NAT keepalive functions */ |
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357 | static void |
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358 | natt_keepalive_send (struct sched *param) |
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359 | { |
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360 | struct natt_ka_addrs *ka, *next = NULL; |
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361 | char keepalive_packet[] = { 0xff }; |
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362 | size_t len; |
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363 | int s; |
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364 | |
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365 | for (ka = TAILQ_FIRST(&ka_tree); ka; ka = next) { |
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366 | next = TAILQ_NEXT(ka, chain); |
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367 | |
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368 | s = myaddr_getfd(ka->src); |
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369 | if (s == -1) { |
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370 | natt_keepalive_delete(ka); |
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371 | continue; |
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372 | } |
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373 | plog (LLV_DEBUG, LOCATION, NULL, "KA: %s\n", |
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374 | saddr2str_fromto("%s->%s", ka->src, ka->dst)); |
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375 | len = sendfromto(s, keepalive_packet, sizeof (keepalive_packet), |
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376 | ka->src, ka->dst, 1); |
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377 | if (len == -1) |
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378 | plog(LLV_ERROR, LOCATION, NULL, "KA: sendfromto failed: %s\n", |
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379 | strerror (errno)); |
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380 | } |
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381 | |
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382 | sched_schedule (&sc_natt, lcconf->natt_ka_interval, natt_keepalive_send); |
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383 | } |
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384 | |
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385 | void |
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386 | natt_keepalive_init (void) |
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387 | { |
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388 | TAILQ_INIT(&ka_tree); |
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389 | |
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390 | /* To disable sending KAs set natt_ka_interval=0 */ |
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391 | if (lcconf->natt_ka_interval > 0) |
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392 | sched_schedule (&sc_natt, lcconf->natt_ka_interval, natt_keepalive_send); |
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393 | } |
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394 | |
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395 | int |
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396 | natt_keepalive_add (struct sockaddr *src, struct sockaddr *dst) |
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397 | { |
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398 | struct natt_ka_addrs *ka = NULL, *new_addr; |
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399 | |
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400 | TAILQ_FOREACH (ka, &ka_tree, chain) { |
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401 | if (cmpsaddr(ka->src, src) == CMPSADDR_MATCH && |
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402 | cmpsaddr(ka->dst, dst) == CMPSADDR_MATCH) { |
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403 | ka->in_use++; |
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404 | plog (LLV_INFO, LOCATION, NULL, "KA found: %s (in_use=%u)\n", |
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405 | saddr2str_fromto("%s->%s", src, dst), ka->in_use); |
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406 | return 0; |
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407 | } |
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408 | } |
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409 | |
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410 | plog (LLV_INFO, LOCATION, NULL, "KA list add: %s\n", saddr2str_fromto("%s->%s", src, dst)); |
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411 | |
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412 | new_addr = (struct natt_ka_addrs *)racoon_malloc(sizeof(*new_addr)); |
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413 | if (! new_addr) { |
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414 | plog (LLV_ERROR, LOCATION, NULL, "Can't allocate new KA list item\n"); |
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415 | return -1; |
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416 | } |
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417 | |
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418 | if ((new_addr->src = dupsaddr(src)) == NULL) { |
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419 | racoon_free(new_addr); |
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420 | plog (LLV_ERROR, LOCATION, NULL, "Can't allocate new KA list item\n"); |
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421 | return -1; |
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422 | } |
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423 | if ((new_addr->dst = dupsaddr(dst)) == NULL) { |
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424 | racoon_free(new_addr); |
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425 | plog (LLV_ERROR, LOCATION, NULL, "Can't allocate new KA list item\n"); |
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426 | return -1; |
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427 | } |
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428 | new_addr->in_use = 1; |
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429 | TAILQ_INSERT_TAIL(&ka_tree, new_addr, chain); |
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430 | |
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431 | return 0; |
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432 | } |
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433 | |
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434 | int |
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435 | natt_keepalive_add_ph1 (struct ph1handle *iph1) |
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436 | { |
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437 | int ret = 0; |
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438 | |
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439 | /* Should only the NATed host send keepalives? |
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440 | If yes, add '(iph1->natt_flags & NAT_DETECTED_ME)' |
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441 | to the following condition. */ |
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442 | if (iph1->natt_flags & NAT_DETECTED && |
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443 | ! (iph1->natt_flags & NAT_KA_QUEUED)) { |
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444 | ret = natt_keepalive_add (iph1->local, iph1->remote); |
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445 | if (ret == 0) |
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446 | iph1->natt_flags |= NAT_KA_QUEUED; |
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447 | } |
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448 | |
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449 | return ret; |
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450 | } |
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451 | |
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452 | void |
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453 | natt_keepalive_remove (struct sockaddr *src, struct sockaddr *dst) |
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454 | { |
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455 | struct natt_ka_addrs *ka, *next = NULL; |
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456 | |
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457 | plog (LLV_INFO, LOCATION, NULL, "KA remove: %s\n", saddr2str_fromto("%s->%s", src, dst)); |
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458 | |
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459 | for (ka = TAILQ_FIRST(&ka_tree); ka; ka = next) { |
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460 | next = TAILQ_NEXT(ka, chain); |
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461 | |
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462 | plog (LLV_DEBUG, LOCATION, NULL, "KA tree dump: %s (in_use=%u)\n", |
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463 | saddr2str_fromto("%s->%s", src, dst), ka->in_use); |
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464 | |
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465 | if (cmpsaddr(ka->src, src) == CMPSADDR_MATCH && |
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466 | cmpsaddr(ka->dst, dst) == CMPSADDR_MATCH && |
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467 | -- ka->in_use <= 0) { |
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468 | |
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469 | plog (LLV_DEBUG, LOCATION, NULL, "KA removing this one...\n"); |
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470 | |
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471 | natt_keepalive_delete (ka); |
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472 | /* Should we break here? Every pair of addresses should |
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473 | be inserted only once, but who knows :-) Lets traverse |
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474 | the whole list... */ |
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475 | } |
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476 | } |
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477 | } |
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478 | |
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479 | static int |
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480 | natt_enabled_in_rmconf_stub (struct remoteconf *rmconf, void *data) |
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481 | { |
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482 | return rmconf->nat_traversal ? 1 : 0; |
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483 | } |
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484 | |
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485 | int |
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486 | natt_enabled_in_rmconf () |
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487 | { |
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488 | return enumrmconf(NULL, natt_enabled_in_rmconf_stub, NULL) != 0; |
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489 | } |
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490 | |
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491 | |
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492 | struct payload_list * |
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493 | isakmp_plist_append_natt_vids (struct payload_list *plist, vchar_t *vid_natt[MAX_NATT_VID_COUNT]){ |
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494 | int i, vid_natt_i = 0; |
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495 | |
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496 | if(vid_natt == NULL) |
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497 | return NULL; |
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498 | |
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499 | for (i = 0; i < MAX_NATT_VID_COUNT; i++) |
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500 | vid_natt[i]=NULL; |
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501 | |
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502 | /* Puts the olders VIDs last, as some implementations may choose the first |
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503 | * NATT VID given |
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504 | */ |
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505 | |
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506 | /* Always set RFC VID |
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507 | */ |
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508 | if ((vid_natt[vid_natt_i] = set_vendorid(VENDORID_NATT_RFC)) != NULL) |
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509 | vid_natt_i++; |
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510 | #ifdef ENABLE_NATT_08 |
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511 | if ((vid_natt[vid_natt_i] = set_vendorid(VENDORID_NATT_08)) != NULL) |
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512 | vid_natt_i++; |
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513 | #endif |
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514 | #ifdef ENABLE_NATT_07 |
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515 | if ((vid_natt[vid_natt_i] = set_vendorid(VENDORID_NATT_07)) != NULL) |
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516 | vid_natt_i++; |
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517 | #endif |
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518 | #ifdef ENABLE_NATT_06 |
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519 | if ((vid_natt[vid_natt_i] = set_vendorid(VENDORID_NATT_06)) != NULL) |
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520 | vid_natt_i++; |
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521 | #endif |
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522 | #ifdef ENABLE_NATT_05 |
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523 | if ((vid_natt[vid_natt_i] = set_vendorid(VENDORID_NATT_05)) != NULL) |
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524 | vid_natt_i++; |
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525 | #endif |
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526 | #ifdef ENABLE_NATT_04 |
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527 | if ((vid_natt[vid_natt_i] = set_vendorid(VENDORID_NATT_04)) != NULL) |
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528 | vid_natt_i++; |
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529 | #endif |
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530 | #ifdef ENABLE_NATT_03 |
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531 | if ((vid_natt[vid_natt_i] = set_vendorid(VENDORID_NATT_03)) != NULL) |
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532 | vid_natt_i++; |
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533 | #endif |
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534 | #ifdef ENABLE_NATT_02 |
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535 | if ((vid_natt[vid_natt_i] = set_vendorid(VENDORID_NATT_02)) != NULL) |
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536 | vid_natt_i++; |
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537 | if ((vid_natt[vid_natt_i] = set_vendorid(VENDORID_NATT_02_N)) != NULL) |
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538 | vid_natt_i++; |
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539 | #endif |
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540 | #ifdef ENABLE_NATT_01 |
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541 | if ((vid_natt[vid_natt_i] = set_vendorid(VENDORID_NATT_01)) != NULL) |
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542 | vid_natt_i++; |
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543 | #endif |
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544 | #ifdef ENABLE_NATT_00 |
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545 | if ((vid_natt[vid_natt_i] = set_vendorid(VENDORID_NATT_00)) != NULL) |
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546 | vid_natt_i++; |
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547 | #endif |
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548 | /* set VID payload for NAT-T */ |
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549 | for (i = 0; i < vid_natt_i; i++) |
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550 | plist = isakmp_plist_append(plist, vid_natt[i], ISAKMP_NPTYPE_VID); |
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551 | |
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552 | return plist; |
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553 | } |
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