BadVPN – Blame information for rev 1
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1 | office | 1 | /* |
2 | * ipv6cp.c - PPP IPV6 Control Protocol. |
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3 | * |
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4 | * Copyright (c) 1999 Tommi Komulainen. All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions |
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8 | * are met: |
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9 | * |
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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 | * |
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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 |
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15 | * the documentation and/or other materials provided with the |
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16 | * distribution. |
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17 | * |
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18 | * 3. The name(s) of the authors of this software must not be used to |
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19 | * endorse or promote products derived from this software without |
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20 | * prior written permission. |
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21 | * |
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22 | * 4. Redistributions of any form whatsoever must retain the following |
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23 | * acknowledgment: |
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24 | * "This product includes software developed by Tommi Komulainen |
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25 | * <Tommi.Komulainen@iki.fi>". |
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26 | * |
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27 | * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO |
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28 | * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY |
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29 | * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY |
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30 | * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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31 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN |
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32 | * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING |
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33 | * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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34 | * |
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35 | */ |
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36 | |||
37 | /* Original version, based on RFC2023 : |
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38 | |||
39 | Copyright (c) 1995, 1996, 1997 Francis.Dupont@inria.fr, INRIA Rocquencourt, |
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40 | Alain.Durand@imag.fr, IMAG, |
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41 | Jean-Luc.Richier@imag.fr, IMAG-LSR. |
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42 | |||
43 | Copyright (c) 1998, 1999 Francis.Dupont@inria.fr, GIE DYADE, |
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44 | Alain.Durand@imag.fr, IMAG, |
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45 | Jean-Luc.Richier@imag.fr, IMAG-LSR. |
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46 | |||
47 | Ce travail a été fait au sein du GIE DYADE (Groupement d'Intérêt |
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48 | Économique ayant pour membres BULL S.A. et l'INRIA). |
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49 | |||
50 | Ce logiciel informatique est disponible aux conditions |
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51 | usuelles dans la recherche, c'est-à-dire qu'il peut |
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52 | être utilisé, copié, modifié, distribué à l'unique |
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53 | condition que ce texte soit conservé afin que |
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54 | l'origine de ce logiciel soit reconnue. |
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55 | |||
56 | Le nom de l'Institut National de Recherche en Informatique |
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57 | et en Automatique (INRIA), de l'IMAG, ou d'une personne morale |
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58 | ou physique ayant participé à l'élaboration de ce logiciel ne peut |
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59 | être utilisé sans son accord préalable explicite. |
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60 | |||
61 | Ce logiciel est fourni tel quel sans aucune garantie, |
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62 | support ou responsabilité d'aucune sorte. |
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63 | Ce logiciel est dérivé de sources d'origine |
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64 | "University of California at Berkeley" et |
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65 | "Digital Equipment Corporation" couvertes par des copyrights. |
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66 | |||
67 | L'Institut d'Informatique et de Mathématiques Appliquées de Grenoble (IMAG) |
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68 | est une fédération d'unités mixtes de recherche du CNRS, de l'Institut National |
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69 | Polytechnique de Grenoble et de l'Université Joseph Fourier regroupant |
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70 | sept laboratoires dont le laboratoire Logiciels, Systèmes, Réseaux (LSR). |
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71 | |||
72 | This work has been done in the context of GIE DYADE (joint R & D venture |
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73 | between BULL S.A. and INRIA). |
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74 | |||
75 | This software is available with usual "research" terms |
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76 | with the aim of retain credits of the software. |
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77 | Permission to use, copy, modify and distribute this software for any |
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78 | purpose and without fee is hereby granted, provided that the above |
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79 | copyright notice and this permission notice appear in all copies, |
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80 | and the name of INRIA, IMAG, or any contributor not be used in advertising |
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81 | or publicity pertaining to this material without the prior explicit |
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82 | permission. The software is provided "as is" without any |
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83 | warranties, support or liabilities of any kind. |
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84 | This software is derived from source code from |
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85 | "University of California at Berkeley" and |
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86 | "Digital Equipment Corporation" protected by copyrights. |
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87 | |||
88 | Grenoble's Institute of Computer Science and Applied Mathematics (IMAG) |
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89 | is a federation of seven research units funded by the CNRS, National |
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90 | Polytechnic Institute of Grenoble and University Joseph Fourier. |
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91 | The research unit in Software, Systems, Networks (LSR) is member of IMAG. |
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92 | */ |
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93 | |||
94 | /* |
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95 | * Derived from : |
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96 | * |
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97 | * |
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98 | * ipcp.c - PPP IP Control Protocol. |
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99 | * |
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100 | * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved. |
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101 | * |
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102 | * Redistribution and use in source and binary forms, with or without |
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103 | * modification, are permitted provided that the following conditions |
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104 | * are met: |
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105 | * |
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106 | * 1. Redistributions of source code must retain the above copyright |
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107 | * notice, this list of conditions and the following disclaimer. |
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108 | * |
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109 | * 2. Redistributions in binary form must reproduce the above copyright |
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110 | * notice, this list of conditions and the following disclaimer in |
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111 | * the documentation and/or other materials provided with the |
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112 | * distribution. |
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113 | * |
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114 | * 3. The name "Carnegie Mellon University" must not be used to |
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115 | * endorse or promote products derived from this software without |
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116 | * prior written permission. For permission or any legal |
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117 | * details, please contact |
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118 | * Office of Technology Transfer |
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119 | * Carnegie Mellon University |
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120 | * 5000 Forbes Avenue |
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121 | * Pittsburgh, PA 15213-3890 |
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122 | * (412) 268-4387, fax: (412) 268-7395 |
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123 | * tech-transfer@andrew.cmu.edu |
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124 | * |
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125 | * 4. Redistributions of any form whatsoever must retain the following |
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126 | * acknowledgment: |
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127 | * "This product includes software developed by Computing Services |
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128 | * at Carnegie Mellon University (http://www.cmu.edu/computing/)." |
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129 | * |
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130 | * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO |
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131 | * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY |
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132 | * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE |
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133 | * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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134 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN |
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135 | * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING |
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136 | * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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137 | * |
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138 | * $Id: ipv6cp.c,v 1.21 2005/08/25 23:59:34 paulus Exp $ |
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139 | */ |
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140 | |||
141 | /* |
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142 | * @todo: |
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143 | * |
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144 | * Proxy Neighbour Discovery. |
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145 | * |
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146 | * Better defines for selecting the ordering of |
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147 | * interface up / set address. |
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148 | */ |
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149 | |||
150 | #include "netif/ppp/ppp_opts.h" |
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151 | #if PPP_SUPPORT && PPP_IPV6_SUPPORT /* don't build if not configured for use in lwipopts.h */ |
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152 | |||
153 | #if 0 /* UNUSED */ |
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154 | #include <stdio.h> |
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155 | #include <string.h> |
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156 | #include <unistd.h> |
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157 | #include <netdb.h> |
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158 | #include <sys/param.h> |
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159 | #include <sys/types.h> |
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160 | #include <sys/socket.h> |
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161 | #include <netinet/in.h> |
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162 | #include <arpa/inet.h> |
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163 | #endif /* UNUSED */ |
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164 | |||
165 | #include "netif/ppp/ppp_impl.h" |
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166 | #include "netif/ppp/fsm.h" |
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167 | #include "netif/ppp/ipcp.h" |
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168 | #include "netif/ppp/ipv6cp.h" |
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169 | #include "netif/ppp/magic.h" |
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170 | |||
171 | /* global vars */ |
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172 | #if 0 /* UNUSED */ |
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173 | int no_ifaceid_neg = 0; |
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174 | #endif /* UNUSED */ |
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175 | |||
176 | /* |
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177 | * Callbacks for fsm code. (CI = Configuration Information) |
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178 | */ |
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179 | static void ipv6cp_resetci(fsm *f); /* Reset our CI */ |
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180 | static int ipv6cp_cilen(fsm *f); /* Return length of our CI */ |
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181 | static void ipv6cp_addci(fsm *f, u_char *ucp, int *lenp); /* Add our CI */ |
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182 | static int ipv6cp_ackci(fsm *f, u_char *p, int len); /* Peer ack'd our CI */ |
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183 | static int ipv6cp_nakci(fsm *f, u_char *p, int len, int treat_as_reject); /* Peer nak'd our CI */ |
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184 | static int ipv6cp_rejci(fsm *f, u_char *p, int len); /* Peer rej'd our CI */ |
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185 | static int ipv6cp_reqci(fsm *f, u_char *inp, int *len, int reject_if_disagree); /* Rcv CI */ |
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186 | static void ipv6cp_up(fsm *f); /* We're UP */ |
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187 | static void ipv6cp_down(fsm *f); /* We're DOWN */ |
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188 | static void ipv6cp_finished(fsm *f); /* Don't need lower layer */ |
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189 | |||
190 | static const fsm_callbacks ipv6cp_callbacks = { /* IPV6CP callback routines */ |
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191 | ipv6cp_resetci, /* Reset our Configuration Information */ |
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192 | ipv6cp_cilen, /* Length of our Configuration Information */ |
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193 | ipv6cp_addci, /* Add our Configuration Information */ |
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194 | ipv6cp_ackci, /* ACK our Configuration Information */ |
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195 | ipv6cp_nakci, /* NAK our Configuration Information */ |
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196 | ipv6cp_rejci, /* Reject our Configuration Information */ |
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197 | ipv6cp_reqci, /* Request peer's Configuration Information */ |
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198 | ipv6cp_up, /* Called when fsm reaches OPENED state */ |
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199 | ipv6cp_down, /* Called when fsm leaves OPENED state */ |
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200 | NULL, /* Called when we want the lower layer up */ |
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201 | ipv6cp_finished, /* Called when we want the lower layer down */ |
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202 | NULL, /* Called when Protocol-Reject received */ |
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203 | NULL, /* Retransmission is necessary */ |
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204 | NULL, /* Called to handle protocol-specific codes */ |
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205 | "IPV6CP" /* String name of protocol */ |
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206 | }; |
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207 | |||
208 | #if PPP_OPTIONS |
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209 | /* |
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210 | * Command-line options. |
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211 | */ |
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212 | static int setifaceid(char **arg)); |
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213 | static void printifaceid(option_t *, |
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214 | void (*)(void *, char *, ...), void *)); |
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215 | |||
216 | static option_t ipv6cp_option_list[] = { |
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217 | { "ipv6", o_special, (void *)setifaceid, |
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218 | "Set interface identifiers for IPV6", |
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219 | OPT_A2PRINTER, (void *)printifaceid }, |
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220 | |||
221 | { "+ipv6", o_bool, &ipv6cp_protent.enabled_flag, |
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222 | "Enable IPv6 and IPv6CP", OPT_PRIO | 1 }, |
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223 | { "noipv6", o_bool, &ipv6cp_protent.enabled_flag, |
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224 | "Disable IPv6 and IPv6CP", OPT_PRIOSUB }, |
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225 | { "-ipv6", o_bool, &ipv6cp_protent.enabled_flag, |
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226 | "Disable IPv6 and IPv6CP", OPT_PRIOSUB | OPT_ALIAS }, |
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227 | |||
228 | { "ipv6cp-accept-local", o_bool, &ipv6cp_allowoptions[0].accept_local, |
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229 | "Accept peer's interface identifier for us", 1 }, |
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230 | |||
231 | { "ipv6cp-use-ipaddr", o_bool, &ipv6cp_allowoptions[0].use_ip, |
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232 | "Use (default) IPv4 address as interface identifier", 1 }, |
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233 | |||
234 | { "ipv6cp-use-persistent", o_bool, &ipv6cp_wantoptions[0].use_persistent, |
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235 | "Use uniquely-available persistent value for link local address", 1 }, |
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236 | |||
237 | { "ipv6cp-restart", o_int, &ipv6cp_fsm[0].timeouttime, |
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238 | "Set timeout for IPv6CP", OPT_PRIO }, |
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239 | { "ipv6cp-max-terminate", o_int, &ipv6cp_fsm[0].maxtermtransmits, |
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240 | "Set max #xmits for term-reqs", OPT_PRIO }, |
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241 | { "ipv6cp-max-configure", o_int, &ipv6cp_fsm[0].maxconfreqtransmits, |
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242 | "Set max #xmits for conf-reqs", OPT_PRIO }, |
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243 | { "ipv6cp-max-failure", o_int, &ipv6cp_fsm[0].maxnakloops, |
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244 | "Set max #conf-naks for IPv6CP", OPT_PRIO }, |
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245 | |||
246 | { NULL } |
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247 | }; |
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248 | #endif /* PPP_OPTIONS */ |
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249 | |||
250 | /* |
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251 | * Protocol entry points from main code. |
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252 | */ |
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253 | static void ipv6cp_init(ppp_pcb *pcb); |
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254 | static void ipv6cp_open(ppp_pcb *pcb); |
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255 | static void ipv6cp_close(ppp_pcb *pcb, const char *reason); |
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256 | static void ipv6cp_lowerup(ppp_pcb *pcb); |
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257 | static void ipv6cp_lowerdown(ppp_pcb *pcb); |
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258 | static void ipv6cp_input(ppp_pcb *pcb, u_char *p, int len); |
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259 | static void ipv6cp_protrej(ppp_pcb *pcb); |
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260 | #if PPP_OPTIONS |
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261 | static void ipv6_check_options(void); |
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262 | #endif /* PPP_OPTIONS */ |
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263 | #if DEMAND_SUPPORT |
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264 | static int ipv6_demand_conf(int u); |
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265 | #endif /* DEMAND_SUPPORT */ |
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266 | #if PRINTPKT_SUPPORT |
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267 | static int ipv6cp_printpkt(const u_char *p, int plen, |
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268 | void (*printer)(void *, const char *, ...), void *arg); |
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269 | #endif /* PRINTPKT_SUPPORT */ |
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270 | #if DEMAND_SUPPORT |
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271 | static int ipv6_active_pkt(u_char *pkt, int len); |
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272 | #endif /* DEMAND_SUPPORT */ |
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273 | |||
274 | const struct protent ipv6cp_protent = { |
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275 | PPP_IPV6CP, |
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276 | ipv6cp_init, |
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277 | ipv6cp_input, |
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278 | ipv6cp_protrej, |
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279 | ipv6cp_lowerup, |
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280 | ipv6cp_lowerdown, |
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281 | ipv6cp_open, |
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282 | ipv6cp_close, |
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283 | #if PRINTPKT_SUPPORT |
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284 | ipv6cp_printpkt, |
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285 | #endif /* PRINTPKT_SUPPORT */ |
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286 | #if PPP_DATAINPUT |
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287 | NULL, |
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288 | #endif /* PPP_DATAINPUT */ |
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289 | #if PRINTPKT_SUPPORT |
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290 | "IPV6CP", |
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291 | "IPV6", |
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292 | #endif /* PRINTPKT_SUPPORT */ |
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293 | #if PPP_OPTIONS |
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294 | ipv6cp_option_list, |
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295 | ipv6_check_options, |
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296 | #endif /* PPP_OPTIONS */ |
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297 | #if DEMAND_SUPPORT |
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298 | ipv6_demand_conf, |
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299 | ipv6_active_pkt |
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300 | #endif /* DEMAND_SUPPORT */ |
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301 | }; |
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302 | |||
303 | static void ipv6cp_clear_addrs(ppp_pcb *pcb, eui64_t ourid, eui64_t hisid); |
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304 | #if 0 /* UNUSED */ |
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305 | static void ipv6cp_script(char *)); |
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306 | static void ipv6cp_script_done(void *)); |
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307 | #endif /* UNUSED */ |
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308 | |||
309 | /* |
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310 | * Lengths of configuration options. |
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311 | */ |
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312 | #define CILEN_VOID 2 |
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313 | #define CILEN_COMPRESS 4 /* length for RFC2023 compress opt. */ |
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314 | #define CILEN_IFACEID 10 /* RFC2472, interface identifier */ |
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315 | |||
316 | #define CODENAME(x) ((x) == CONFACK ? "ACK" : \ |
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317 | (x) == CONFNAK ? "NAK" : "REJ") |
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318 | |||
319 | #if 0 /* UNUSED */ |
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320 | /* |
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321 | * This state variable is used to ensure that we don't |
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322 | * run an ipcp-up/down script while one is already running. |
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323 | */ |
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324 | static enum script_state { |
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325 | s_down, |
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326 | s_up, |
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327 | } ipv6cp_script_state; |
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328 | static pid_t ipv6cp_script_pid; |
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329 | #endif /* UNUSED */ |
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330 | |||
331 | static char *llv6_ntoa(eui64_t ifaceid); |
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332 | |||
333 | #if PPP_OPTIONS |
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334 | /* |
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335 | * setifaceid - set the interface identifiers manually |
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336 | */ |
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337 | static int |
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338 | setifaceid(argv) |
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339 | char **argv; |
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340 | { |
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341 | char *comma, *arg, c; |
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342 | ipv6cp_options *wo = &ipv6cp_wantoptions[0]; |
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343 | struct in6_addr addr; |
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344 | static int prio_local, prio_remote; |
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345 | |||
346 | #define VALIDID(a) ( (((a).s6_addr32[0] == 0) && ((a).s6_addr32[1] == 0)) && \ |
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347 | (((a).s6_addr32[2] != 0) || ((a).s6_addr32[3] != 0)) ) |
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348 | |||
349 | arg = *argv; |
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350 | if ((comma = strchr(arg, ',')) == NULL) |
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351 | comma = arg + strlen(arg); |
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352 | |||
353 | /* |
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354 | * If comma first character, then no local identifier |
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355 | */ |
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356 | if (comma != arg) { |
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357 | c = *comma; |
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358 | *comma = '\0'; |
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359 | |||
360 | if (inet_pton(AF_INET6, arg, &addr) == 0 || !VALIDID(addr)) { |
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361 | option_error("Illegal interface identifier (local): %s", arg); |
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362 | return 0; |
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363 | } |
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364 | |||
365 | if (option_priority >= prio_local) { |
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366 | eui64_copy(addr.s6_addr32[2], wo->ourid); |
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367 | wo->opt_local = 1; |
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368 | prio_local = option_priority; |
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369 | } |
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370 | *comma = c; |
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371 | } |
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372 | |||
373 | /* |
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374 | * If comma last character, the no remote identifier |
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375 | */ |
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376 | if (*comma != 0 && *++comma != '\0') { |
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377 | if (inet_pton(AF_INET6, comma, &addr) == 0 || !VALIDID(addr)) { |
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378 | option_error("Illegal interface identifier (remote): %s", comma); |
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379 | return 0; |
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380 | } |
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381 | if (option_priority >= prio_remote) { |
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382 | eui64_copy(addr.s6_addr32[2], wo->hisid); |
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383 | wo->opt_remote = 1; |
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384 | prio_remote = option_priority; |
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385 | } |
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386 | } |
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387 | |||
388 | if (override_value("+ipv6", option_priority, option_source)) |
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389 | ipv6cp_protent.enabled_flag = 1; |
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390 | return 1; |
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391 | } |
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392 | |||
393 | static void |
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394 | printifaceid(opt, printer, arg) |
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395 | option_t *opt; |
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396 | void (*printer)(void *, char *, ...)); |
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397 | void *arg; |
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398 | { |
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399 | ipv6cp_options *wo = &ipv6cp_wantoptions[0]; |
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400 | |||
401 | if (wo->opt_local) |
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402 | printer(arg, "%s", llv6_ntoa(wo->ourid)); |
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403 | printer(arg, ","); |
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404 | if (wo->opt_remote) |
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405 | printer(arg, "%s", llv6_ntoa(wo->hisid)); |
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406 | } |
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407 | #endif /* PPP_OPTIONS */ |
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408 | |||
409 | /* |
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410 | * Make a string representation of a network address. |
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411 | */ |
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412 | static char * |
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413 | llv6_ntoa(eui64_t ifaceid) |
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414 | { |
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415 | static char b[26]; |
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416 | |||
417 | sprintf(b, "fe80::%02x%02x:%02x%02x:%02x%02x:%02x%02x", |
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418 | ifaceid.e8[0], ifaceid.e8[1], ifaceid.e8[2], ifaceid.e8[3], |
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419 | ifaceid.e8[4], ifaceid.e8[5], ifaceid.e8[6], ifaceid.e8[7]); |
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420 | |||
421 | return b; |
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422 | } |
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423 | |||
424 | |||
425 | /* |
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426 | * ipv6cp_init - Initialize IPV6CP. |
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427 | */ |
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428 | static void ipv6cp_init(ppp_pcb *pcb) { |
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429 | fsm *f = &pcb->ipv6cp_fsm; |
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430 | ipv6cp_options *wo = &pcb->ipv6cp_wantoptions; |
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431 | ipv6cp_options *ao = &pcb->ipv6cp_allowoptions; |
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432 | |||
433 | f->pcb = pcb; |
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434 | f->protocol = PPP_IPV6CP; |
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435 | f->callbacks = &ipv6cp_callbacks; |
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436 | fsm_init(f); |
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437 | |||
438 | #if 0 /* Not necessary, everything is cleared in ppp_new() */ |
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439 | memset(wo, 0, sizeof(*wo)); |
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440 | memset(ao, 0, sizeof(*ao)); |
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441 | #endif /* 0 */ |
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442 | |||
443 | wo->accept_local = 1; |
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444 | wo->neg_ifaceid = 1; |
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445 | ao->neg_ifaceid = 1; |
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446 | |||
447 | #ifdef IPV6CP_COMP |
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448 | wo->neg_vj = 1; |
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449 | ao->neg_vj = 1; |
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450 | wo->vj_protocol = IPV6CP_COMP; |
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451 | #endif |
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452 | |||
453 | } |
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454 | |||
455 | |||
456 | /* |
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457 | * ipv6cp_open - IPV6CP is allowed to come up. |
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458 | */ |
||
459 | static void ipv6cp_open(ppp_pcb *pcb) { |
||
460 | fsm_open(&pcb->ipv6cp_fsm); |
||
461 | } |
||
462 | |||
463 | |||
464 | /* |
||
465 | * ipv6cp_close - Take IPV6CP down. |
||
466 | */ |
||
467 | static void ipv6cp_close(ppp_pcb *pcb, const char *reason) { |
||
468 | fsm_close(&pcb->ipv6cp_fsm, reason); |
||
469 | } |
||
470 | |||
471 | |||
472 | /* |
||
473 | * ipv6cp_lowerup - The lower layer is up. |
||
474 | */ |
||
475 | static void ipv6cp_lowerup(ppp_pcb *pcb) { |
||
476 | fsm_lowerup(&pcb->ipv6cp_fsm); |
||
477 | } |
||
478 | |||
479 | |||
480 | /* |
||
481 | * ipv6cp_lowerdown - The lower layer is down. |
||
482 | */ |
||
483 | static void ipv6cp_lowerdown(ppp_pcb *pcb) { |
||
484 | fsm_lowerdown(&pcb->ipv6cp_fsm); |
||
485 | } |
||
486 | |||
487 | |||
488 | /* |
||
489 | * ipv6cp_input - Input IPV6CP packet. |
||
490 | */ |
||
491 | static void ipv6cp_input(ppp_pcb *pcb, u_char *p, int len) { |
||
492 | fsm_input(&pcb->ipv6cp_fsm, p, len); |
||
493 | } |
||
494 | |||
495 | |||
496 | /* |
||
497 | * ipv6cp_protrej - A Protocol-Reject was received for IPV6CP. |
||
498 | * |
||
499 | * Pretend the lower layer went down, so we shut up. |
||
500 | */ |
||
501 | static void ipv6cp_protrej(ppp_pcb *pcb) { |
||
502 | fsm_lowerdown(&pcb->ipv6cp_fsm); |
||
503 | } |
||
504 | |||
505 | |||
506 | /* |
||
507 | * ipv6cp_resetci - Reset our CI. |
||
508 | */ |
||
509 | static void ipv6cp_resetci(fsm *f) { |
||
510 | ppp_pcb *pcb = f->pcb; |
||
511 | ipv6cp_options *wo = &pcb->ipv6cp_wantoptions; |
||
512 | ipv6cp_options *go = &pcb->ipv6cp_gotoptions; |
||
513 | ipv6cp_options *ao = &pcb->ipv6cp_allowoptions; |
||
514 | |||
515 | wo->req_ifaceid = wo->neg_ifaceid && ao->neg_ifaceid; |
||
516 | |||
517 | if (!wo->opt_local) { |
||
518 | eui64_magic_nz(wo->ourid); |
||
519 | } |
||
520 | |||
521 | *go = *wo; |
||
522 | eui64_zero(go->hisid); /* last proposed interface identifier */ |
||
523 | } |
||
524 | |||
525 | |||
526 | /* |
||
527 | * ipv6cp_cilen - Return length of our CI. |
||
528 | */ |
||
529 | static int ipv6cp_cilen(fsm *f) { |
||
530 | ppp_pcb *pcb = f->pcb; |
||
531 | ipv6cp_options *go = &pcb->ipv6cp_gotoptions; |
||
532 | |||
533 | #ifdef IPV6CP_COMP |
||
534 | #define LENCIVJ(neg) (neg ? CILEN_COMPRESS : 0) |
||
535 | #endif /* IPV6CP_COMP */ |
||
536 | #define LENCIIFACEID(neg) (neg ? CILEN_IFACEID : 0) |
||
537 | |||
538 | return (LENCIIFACEID(go->neg_ifaceid) + |
||
539 | #ifdef IPV6CP_COMP |
||
540 | LENCIVJ(go->neg_vj) + |
||
541 | #endif /* IPV6CP_COMP */ |
||
542 | 0); |
||
543 | } |
||
544 | |||
545 | |||
546 | /* |
||
547 | * ipv6cp_addci - Add our desired CIs to a packet. |
||
548 | */ |
||
549 | static void ipv6cp_addci(fsm *f, u_char *ucp, int *lenp) { |
||
550 | ppp_pcb *pcb = f->pcb; |
||
551 | ipv6cp_options *go = &pcb->ipv6cp_gotoptions; |
||
552 | int len = *lenp; |
||
553 | |||
554 | #ifdef IPV6CP_COMP |
||
555 | #define ADDCIVJ(opt, neg, val) \ |
||
556 | if (neg) { \ |
||
557 | int vjlen = CILEN_COMPRESS; \ |
||
558 | if (len >= vjlen) { \ |
||
559 | PUTCHAR(opt, ucp); \ |
||
560 | PUTCHAR(vjlen, ucp); \ |
||
561 | PUTSHORT(val, ucp); \ |
||
562 | len -= vjlen; \ |
||
563 | } else \ |
||
564 | neg = 0; \ |
||
565 | } |
||
566 | #endif /* IPV6CP_COMP */ |
||
567 | |||
568 | #define ADDCIIFACEID(opt, neg, val1) \ |
||
569 | if (neg) { \ |
||
570 | int idlen = CILEN_IFACEID; \ |
||
571 | if (len >= idlen) { \ |
||
572 | PUTCHAR(opt, ucp); \ |
||
573 | PUTCHAR(idlen, ucp); \ |
||
574 | eui64_put(val1, ucp); \ |
||
575 | len -= idlen; \ |
||
576 | } else \ |
||
577 | neg = 0; \ |
||
578 | } |
||
579 | |||
580 | ADDCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid); |
||
581 | |||
582 | #ifdef IPV6CP_COMP |
||
583 | ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol); |
||
584 | #endif /* IPV6CP_COMP */ |
||
585 | |||
586 | *lenp -= len; |
||
587 | } |
||
588 | |||
589 | |||
590 | /* |
||
591 | * ipv6cp_ackci - Ack our CIs. |
||
592 | * |
||
593 | * Returns: |
||
594 | * 0 - Ack was bad. |
||
595 | * 1 - Ack was good. |
||
596 | */ |
||
597 | static int ipv6cp_ackci(fsm *f, u_char *p, int len) { |
||
598 | ppp_pcb *pcb = f->pcb; |
||
599 | ipv6cp_options *go = &pcb->ipv6cp_gotoptions; |
||
600 | u_short cilen, citype; |
||
601 | #ifdef IPV6CP_COMP |
||
602 | u_short cishort; |
||
603 | #endif /* IPV6CP_COMP */ |
||
604 | eui64_t ifaceid; |
||
605 | |||
606 | /* |
||
607 | * CIs must be in exactly the same order that we sent... |
||
608 | * Check packet length and CI length at each step. |
||
609 | * If we find any deviations, then this packet is bad. |
||
610 | */ |
||
611 | |||
612 | #ifdef IPV6CP_COMP |
||
613 | #define ACKCIVJ(opt, neg, val) \ |
||
614 | if (neg) { \ |
||
615 | int vjlen = CILEN_COMPRESS; \ |
||
616 | if ((len -= vjlen) < 0) \ |
||
617 | goto bad; \ |
||
618 | GETCHAR(citype, p); \ |
||
619 | GETCHAR(cilen, p); \ |
||
620 | if (cilen != vjlen || \ |
||
621 | citype != opt) \ |
||
622 | goto bad; \ |
||
623 | GETSHORT(cishort, p); \ |
||
624 | if (cishort != val) \ |
||
625 | goto bad; \ |
||
626 | } |
||
627 | #endif /* IPV6CP_COMP */ |
||
628 | |||
629 | #define ACKCIIFACEID(opt, neg, val1) \ |
||
630 | if (neg) { \ |
||
631 | int idlen = CILEN_IFACEID; \ |
||
632 | if ((len -= idlen) < 0) \ |
||
633 | goto bad; \ |
||
634 | GETCHAR(citype, p); \ |
||
635 | GETCHAR(cilen, p); \ |
||
636 | if (cilen != idlen || \ |
||
637 | citype != opt) \ |
||
638 | goto bad; \ |
||
639 | eui64_get(ifaceid, p); \ |
||
640 | if (! eui64_equals(val1, ifaceid)) \ |
||
641 | goto bad; \ |
||
642 | } |
||
643 | |||
644 | ACKCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid); |
||
645 | |||
646 | #ifdef IPV6CP_COMP |
||
647 | ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol); |
||
648 | #endif /* IPV6CP_COMP */ |
||
649 | |||
650 | /* |
||
651 | * If there are any remaining CIs, then this packet is bad. |
||
652 | */ |
||
653 | if (len != 0) |
||
654 | goto bad; |
||
655 | return (1); |
||
656 | |||
657 | bad: |
||
658 | IPV6CPDEBUG(("ipv6cp_ackci: received bad Ack!")); |
||
659 | return (0); |
||
660 | } |
||
661 | |||
662 | /* |
||
663 | * ipv6cp_nakci - Peer has sent a NAK for some of our CIs. |
||
664 | * This should not modify any state if the Nak is bad |
||
665 | * or if IPV6CP is in the OPENED state. |
||
666 | * |
||
667 | * Returns: |
||
668 | * 0 - Nak was bad. |
||
669 | * 1 - Nak was good. |
||
670 | */ |
||
671 | static int ipv6cp_nakci(fsm *f, u_char *p, int len, int treat_as_reject) { |
||
672 | ppp_pcb *pcb = f->pcb; |
||
673 | ipv6cp_options *go = &pcb->ipv6cp_gotoptions; |
||
674 | u_char citype, cilen, *next; |
||
675 | #ifdef IPV6CP_COMP |
||
676 | u_short cishort; |
||
677 | #endif /* IPV6CP_COMP */ |
||
678 | eui64_t ifaceid; |
||
679 | ipv6cp_options no; /* options we've seen Naks for */ |
||
680 | ipv6cp_options try_; /* options to request next time */ |
||
681 | |||
682 | BZERO(&no, sizeof(no)); |
||
683 | try_ = *go; |
||
684 | |||
685 | /* |
||
686 | * Any Nak'd CIs must be in exactly the same order that we sent. |
||
687 | * Check packet length and CI length at each step. |
||
688 | * If we find any deviations, then this packet is bad. |
||
689 | */ |
||
690 | #define NAKCIIFACEID(opt, neg, code) \ |
||
691 | if (go->neg && \ |
||
692 | len >= (cilen = CILEN_IFACEID) && \ |
||
693 | p[1] == cilen && \ |
||
694 | p[0] == opt) { \ |
||
695 | len -= cilen; \ |
||
696 | INCPTR(2, p); \ |
||
697 | eui64_get(ifaceid, p); \ |
||
698 | no.neg = 1; \ |
||
699 | code \ |
||
700 | } |
||
701 | |||
702 | #ifdef IPV6CP_COMP |
||
703 | #define NAKCIVJ(opt, neg, code) \ |
||
704 | if (go->neg && \ |
||
705 | ((cilen = p[1]) == CILEN_COMPRESS) && \ |
||
706 | len >= cilen && \ |
||
707 | p[0] == opt) { \ |
||
708 | len -= cilen; \ |
||
709 | INCPTR(2, p); \ |
||
710 | GETSHORT(cishort, p); \ |
||
711 | no.neg = 1; \ |
||
712 | code \ |
||
713 | } |
||
714 | #endif /* IPV6CP_COMP */ |
||
715 | |||
716 | /* |
||
717 | * Accept the peer's idea of {our,his} interface identifier, if different |
||
718 | * from our idea, only if the accept_{local,remote} flag is set. |
||
719 | */ |
||
720 | NAKCIIFACEID(CI_IFACEID, neg_ifaceid, |
||
721 | if (treat_as_reject) { |
||
722 | try_.neg_ifaceid = 0; |
||
723 | } else if (go->accept_local) { |
||
724 | while (eui64_iszero(ifaceid) || |
||
725 | eui64_equals(ifaceid, go->hisid)) /* bad luck */ |
||
726 | eui64_magic(ifaceid); |
||
727 | try_.ourid = ifaceid; |
||
728 | IPV6CPDEBUG(("local LL address %s", llv6_ntoa(ifaceid))); |
||
729 | } |
||
730 | ); |
||
731 | |||
732 | #ifdef IPV6CP_COMP |
||
733 | NAKCIVJ(CI_COMPRESSTYPE, neg_vj, |
||
734 | { |
||
735 | if (cishort == IPV6CP_COMP && !treat_as_reject) { |
||
736 | try_.vj_protocol = cishort; |
||
737 | } else { |
||
738 | try_.neg_vj = 0; |
||
739 | } |
||
740 | } |
||
741 | ); |
||
742 | #endif /* IPV6CP_COMP */ |
||
743 | |||
744 | /* |
||
745 | * There may be remaining CIs, if the peer is requesting negotiation |
||
746 | * on an option that we didn't include in our request packet. |
||
747 | * If they want to negotiate about interface identifier, we comply. |
||
748 | * If they want us to ask for compression, we refuse. |
||
749 | */ |
||
750 | while (len >= CILEN_VOID) { |
||
751 | GETCHAR(citype, p); |
||
752 | GETCHAR(cilen, p); |
||
753 | if ( cilen < CILEN_VOID || (len -= cilen) < 0 ) |
||
754 | goto bad; |
||
755 | next = p + cilen - 2; |
||
756 | |||
757 | switch (citype) { |
||
758 | #ifdef IPV6CP_COMP |
||
759 | case CI_COMPRESSTYPE: |
||
760 | if (go->neg_vj || no.neg_vj || |
||
761 | (cilen != CILEN_COMPRESS)) |
||
762 | goto bad; |
||
763 | no.neg_vj = 1; |
||
764 | break; |
||
765 | #endif /* IPV6CP_COMP */ |
||
766 | case CI_IFACEID: |
||
767 | if (go->neg_ifaceid || no.neg_ifaceid || cilen != CILEN_IFACEID) |
||
768 | goto bad; |
||
769 | try_.neg_ifaceid = 1; |
||
770 | eui64_get(ifaceid, p); |
||
771 | if (go->accept_local) { |
||
772 | while (eui64_iszero(ifaceid) || |
||
773 | eui64_equals(ifaceid, go->hisid)) /* bad luck */ |
||
774 | eui64_magic(ifaceid); |
||
775 | try_.ourid = ifaceid; |
||
776 | } |
||
777 | no.neg_ifaceid = 1; |
||
778 | break; |
||
779 | default: |
||
780 | break; |
||
781 | } |
||
782 | p = next; |
||
783 | } |
||
784 | |||
785 | /* If there is still anything left, this packet is bad. */ |
||
786 | if (len != 0) |
||
787 | goto bad; |
||
788 | |||
789 | /* |
||
790 | * OK, the Nak is good. Now we can update state. |
||
791 | */ |
||
792 | if (f->state != PPP_FSM_OPENED) |
||
793 | *go = try_; |
||
794 | |||
795 | return 1; |
||
796 | |||
797 | bad: |
||
798 | IPV6CPDEBUG(("ipv6cp_nakci: received bad Nak!")); |
||
799 | return 0; |
||
800 | } |
||
801 | |||
802 | |||
803 | /* |
||
804 | * ipv6cp_rejci - Reject some of our CIs. |
||
805 | */ |
||
806 | static int ipv6cp_rejci(fsm *f, u_char *p, int len) { |
||
807 | ppp_pcb *pcb = f->pcb; |
||
808 | ipv6cp_options *go = &pcb->ipv6cp_gotoptions; |
||
809 | u_char cilen; |
||
810 | #ifdef IPV6CP_COMP |
||
811 | u_short cishort; |
||
812 | #endif /* IPV6CP_COMP */ |
||
813 | eui64_t ifaceid; |
||
814 | ipv6cp_options try_; /* options to request next time */ |
||
815 | |||
816 | try_ = *go; |
||
817 | /* |
||
818 | * Any Rejected CIs must be in exactly the same order that we sent. |
||
819 | * Check packet length and CI length at each step. |
||
820 | * If we find any deviations, then this packet is bad. |
||
821 | */ |
||
822 | #define REJCIIFACEID(opt, neg, val1) \ |
||
823 | if (go->neg && \ |
||
824 | len >= (cilen = CILEN_IFACEID) && \ |
||
825 | p[1] == cilen && \ |
||
826 | p[0] == opt) { \ |
||
827 | len -= cilen; \ |
||
828 | INCPTR(2, p); \ |
||
829 | eui64_get(ifaceid, p); \ |
||
830 | /* Check rejected value. */ \ |
||
831 | if (! eui64_equals(ifaceid, val1)) \ |
||
832 | goto bad; \ |
||
833 | try_.neg = 0; \ |
||
834 | } |
||
835 | |||
836 | #ifdef IPV6CP_COMP |
||
837 | #define REJCIVJ(opt, neg, val) \ |
||
838 | if (go->neg && \ |
||
839 | p[1] == CILEN_COMPRESS && \ |
||
840 | len >= p[1] && \ |
||
841 | p[0] == opt) { \ |
||
842 | len -= p[1]; \ |
||
843 | INCPTR(2, p); \ |
||
844 | GETSHORT(cishort, p); \ |
||
845 | /* Check rejected value. */ \ |
||
846 | if (cishort != val) \ |
||
847 | goto bad; \ |
||
848 | try_.neg = 0; \ |
||
849 | } |
||
850 | #endif /* IPV6CP_COMP */ |
||
851 | |||
852 | REJCIIFACEID(CI_IFACEID, neg_ifaceid, go->ourid); |
||
853 | |||
854 | #ifdef IPV6CP_COMP |
||
855 | REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol); |
||
856 | #endif /* IPV6CP_COMP */ |
||
857 | |||
858 | /* |
||
859 | * If there are any remaining CIs, then this packet is bad. |
||
860 | */ |
||
861 | if (len != 0) |
||
862 | goto bad; |
||
863 | /* |
||
864 | * Now we can update state. |
||
865 | */ |
||
866 | if (f->state != PPP_FSM_OPENED) |
||
867 | *go = try_; |
||
868 | return 1; |
||
869 | |||
870 | bad: |
||
871 | IPV6CPDEBUG(("ipv6cp_rejci: received bad Reject!")); |
||
872 | return 0; |
||
873 | } |
||
874 | |||
875 | |||
876 | /* |
||
877 | * ipv6cp_reqci - Check the peer's requested CIs and send appropriate response. |
||
878 | * |
||
879 | * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified |
||
880 | * appropriately. If reject_if_disagree is non-zero, doesn't return |
||
881 | * CONFNAK; returns CONFREJ if it can't return CONFACK. |
||
882 | * |
||
883 | * inp = Requested CIs |
||
884 | * len = Length of requested CIs |
||
885 | * |
||
886 | */ |
||
887 | static int ipv6cp_reqci(fsm *f, u_char *inp, int *len, int reject_if_disagree) { |
||
888 | ppp_pcb *pcb = f->pcb; |
||
889 | ipv6cp_options *wo = &pcb->ipv6cp_wantoptions; |
||
890 | ipv6cp_options *ho = &pcb->ipv6cp_hisoptions; |
||
891 | ipv6cp_options *ao = &pcb->ipv6cp_allowoptions; |
||
892 | ipv6cp_options *go = &pcb->ipv6cp_gotoptions; |
||
893 | u_char *cip, *next; /* Pointer to current and next CIs */ |
||
894 | u_short cilen, citype; /* Parsed len, type */ |
||
895 | #ifdef IPV6CP_COMP |
||
896 | u_short cishort; /* Parsed short value */ |
||
897 | #endif /* IPV6CP_COMP */ |
||
898 | eui64_t ifaceid; /* Parsed interface identifier */ |
||
899 | int rc = CONFACK; /* Final packet return code */ |
||
900 | int orc; /* Individual option return code */ |
||
901 | u_char *p; /* Pointer to next char to parse */ |
||
902 | u_char *ucp = inp; /* Pointer to current output char */ |
||
903 | int l = *len; /* Length left */ |
||
904 | |||
905 | /* |
||
906 | * Reset all his options. |
||
907 | */ |
||
908 | BZERO(ho, sizeof(*ho)); |
||
909 | |||
910 | /* |
||
911 | * Process all his options. |
||
912 | */ |
||
913 | next = inp; |
||
914 | while (l) { |
||
915 | orc = CONFACK; /* Assume success */ |
||
916 | cip = p = next; /* Remember begining of CI */ |
||
917 | if (l < 2 || /* Not enough data for CI header or */ |
||
918 | p[1] < 2 || /* CI length too small or */ |
||
919 | p[1] > l) { /* CI length too big? */ |
||
920 | IPV6CPDEBUG(("ipv6cp_reqci: bad CI length!")); |
||
921 | orc = CONFREJ; /* Reject bad CI */ |
||
922 | cilen = l; /* Reject till end of packet */ |
||
923 | l = 0; /* Don't loop again */ |
||
924 | goto endswitch; |
||
925 | } |
||
926 | GETCHAR(citype, p); /* Parse CI type */ |
||
927 | GETCHAR(cilen, p); /* Parse CI length */ |
||
928 | l -= cilen; /* Adjust remaining length */ |
||
929 | next += cilen; /* Step to next CI */ |
||
930 | |||
931 | switch (citype) { /* Check CI type */ |
||
932 | case CI_IFACEID: |
||
933 | IPV6CPDEBUG(("ipv6cp: received interface identifier ")); |
||
934 | |||
935 | if (!ao->neg_ifaceid || |
||
936 | cilen != CILEN_IFACEID) { /* Check CI length */ |
||
937 | orc = CONFREJ; /* Reject CI */ |
||
938 | break; |
||
939 | } |
||
940 | |||
941 | /* |
||
942 | * If he has no interface identifier, or if we both have same |
||
943 | * identifier then NAK it with new idea. |
||
944 | * In particular, if we don't know his identifier, but he does, |
||
945 | * then accept it. |
||
946 | */ |
||
947 | eui64_get(ifaceid, p); |
||
948 | IPV6CPDEBUG(("(%s)", llv6_ntoa(ifaceid))); |
||
949 | if (eui64_iszero(ifaceid) && eui64_iszero(go->ourid)) { |
||
950 | orc = CONFREJ; /* Reject CI */ |
||
951 | break; |
||
952 | } |
||
953 | if (!eui64_iszero(wo->hisid) && |
||
954 | !eui64_equals(ifaceid, wo->hisid) && |
||
955 | eui64_iszero(go->hisid)) { |
||
956 | |||
957 | orc = CONFNAK; |
||
958 | ifaceid = wo->hisid; |
||
959 | go->hisid = ifaceid; |
||
960 | DECPTR(sizeof(ifaceid), p); |
||
961 | eui64_put(ifaceid, p); |
||
962 | } else |
||
963 | if (eui64_iszero(ifaceid) || eui64_equals(ifaceid, go->ourid)) { |
||
964 | orc = CONFNAK; |
||
965 | if (eui64_iszero(go->hisid)) /* first time, try option */ |
||
966 | ifaceid = wo->hisid; |
||
967 | while (eui64_iszero(ifaceid) || |
||
968 | eui64_equals(ifaceid, go->ourid)) /* bad luck */ |
||
969 | eui64_magic(ifaceid); |
||
970 | go->hisid = ifaceid; |
||
971 | DECPTR(sizeof(ifaceid), p); |
||
972 | eui64_put(ifaceid, p); |
||
973 | } |
||
974 | |||
975 | ho->neg_ifaceid = 1; |
||
976 | ho->hisid = ifaceid; |
||
977 | break; |
||
978 | |||
979 | #ifdef IPV6CP_COMP |
||
980 | case CI_COMPRESSTYPE: |
||
981 | IPV6CPDEBUG(("ipv6cp: received COMPRESSTYPE ")); |
||
982 | if (!ao->neg_vj || |
||
983 | (cilen != CILEN_COMPRESS)) { |
||
984 | orc = CONFREJ; |
||
985 | break; |
||
986 | } |
||
987 | GETSHORT(cishort, p); |
||
988 | IPV6CPDEBUG(("(%d)", cishort)); |
||
989 | |||
990 | if (!(cishort == IPV6CP_COMP)) { |
||
991 | orc = CONFREJ; |
||
992 | break; |
||
993 | } |
||
994 | |||
995 | ho->neg_vj = 1; |
||
996 | ho->vj_protocol = cishort; |
||
997 | break; |
||
998 | #endif /* IPV6CP_COMP */ |
||
999 | |||
1000 | default: |
||
1001 | orc = CONFREJ; |
||
1002 | break; |
||
1003 | } |
||
1004 | |||
1005 | endswitch: |
||
1006 | IPV6CPDEBUG((" (%s)\n", CODENAME(orc))); |
||
1007 | |||
1008 | if (orc == CONFACK && /* Good CI */ |
||
1009 | rc != CONFACK) /* but prior CI wasnt? */ |
||
1010 | continue; /* Don't send this one */ |
||
1011 | |||
1012 | if (orc == CONFNAK) { /* Nak this CI? */ |
||
1013 | if (reject_if_disagree) /* Getting fed up with sending NAKs? */ |
||
1014 | orc = CONFREJ; /* Get tough if so */ |
||
1015 | else { |
||
1016 | if (rc == CONFREJ) /* Rejecting prior CI? */ |
||
1017 | continue; /* Don't send this one */ |
||
1018 | if (rc == CONFACK) { /* Ack'd all prior CIs? */ |
||
1019 | rc = CONFNAK; /* Not anymore... */ |
||
1020 | ucp = inp; /* Backup */ |
||
1021 | } |
||
1022 | } |
||
1023 | } |
||
1024 | |||
1025 | if (orc == CONFREJ && /* Reject this CI */ |
||
1026 | rc != CONFREJ) { /* but no prior ones? */ |
||
1027 | rc = CONFREJ; |
||
1028 | ucp = inp; /* Backup */ |
||
1029 | } |
||
1030 | |||
1031 | /* Need to move CI? */ |
||
1032 | if (ucp != cip) |
||
1033 | MEMCPY(ucp, cip, cilen); /* Move it */ |
||
1034 | |||
1035 | /* Update output pointer */ |
||
1036 | INCPTR(cilen, ucp); |
||
1037 | } |
||
1038 | |||
1039 | /* |
||
1040 | * If we aren't rejecting this packet, and we want to negotiate |
||
1041 | * their identifier and they didn't send their identifier, then we |
||
1042 | * send a NAK with a CI_IFACEID option appended. We assume the |
||
1043 | * input buffer is long enough that we can append the extra |
||
1044 | * option safely. |
||
1045 | */ |
||
1046 | if (rc != CONFREJ && !ho->neg_ifaceid && |
||
1047 | wo->req_ifaceid && !reject_if_disagree) { |
||
1048 | if (rc == CONFACK) { |
||
1049 | rc = CONFNAK; |
||
1050 | ucp = inp; /* reset pointer */ |
||
1051 | wo->req_ifaceid = 0; /* don't ask again */ |
||
1052 | } |
||
1053 | PUTCHAR(CI_IFACEID, ucp); |
||
1054 | PUTCHAR(CILEN_IFACEID, ucp); |
||
1055 | eui64_put(wo->hisid, ucp); |
||
1056 | } |
||
1057 | |||
1058 | *len = ucp - inp; /* Compute output length */ |
||
1059 | IPV6CPDEBUG(("ipv6cp: returning Configure-%s", CODENAME(rc))); |
||
1060 | return (rc); /* Return final code */ |
||
1061 | } |
||
1062 | |||
1063 | #if PPP_OPTIONS |
||
1064 | /* |
||
1065 | * ipv6_check_options - check that any IP-related options are OK, |
||
1066 | * and assign appropriate defaults. |
||
1067 | */ |
||
1068 | static void ipv6_check_options() { |
||
1069 | ipv6cp_options *wo = &ipv6cp_wantoptions[0]; |
||
1070 | |||
1071 | if (!ipv6cp_protent.enabled_flag) |
||
1072 | return; |
||
1073 | |||
1074 | /* |
||
1075 | * Persistent link-local id is only used when user has not explicitly |
||
1076 | * configure/hard-code the id |
||
1077 | */ |
||
1078 | if ((wo->use_persistent) && (!wo->opt_local) && (!wo->opt_remote)) { |
||
1079 | |||
1080 | /* |
||
1081 | * On systems where there are no Ethernet interfaces used, there |
||
1082 | * may be other ways to obtain a persistent id. Right now, it |
||
1083 | * will fall back to using magic [see eui64_magic] below when |
||
1084 | * an EUI-48 from MAC address can't be obtained. Other possibilities |
||
1085 | * include obtaining EEPROM serial numbers, or some other unique |
||
1086 | * yet persistent number. On Sparc platforms, this is possible, |
||
1087 | * but too bad there's no standards yet for x86 machines. |
||
1088 | */ |
||
1089 | if (ether_to_eui64(&wo->ourid)) { |
||
1090 | wo->opt_local = 1; |
||
1091 | } |
||
1092 | } |
||
1093 | |||
1094 | if (!wo->opt_local) { /* init interface identifier */ |
||
1095 | if (wo->use_ip && eui64_iszero(wo->ourid)) { |
||
1096 | eui64_setlo32(wo->ourid, lwip_ntohl(ipcp_wantoptions[0].ouraddr)); |
||
1097 | if (!eui64_iszero(wo->ourid)) |
||
1098 | wo->opt_local = 1; |
||
1099 | } |
||
1100 | |||
1101 | while (eui64_iszero(wo->ourid)) |
||
1102 | eui64_magic(wo->ourid); |
||
1103 | } |
||
1104 | |||
1105 | if (!wo->opt_remote) { |
||
1106 | if (wo->use_ip && eui64_iszero(wo->hisid)) { |
||
1107 | eui64_setlo32(wo->hisid, lwip_ntohl(ipcp_wantoptions[0].hisaddr)); |
||
1108 | if (!eui64_iszero(wo->hisid)) |
||
1109 | wo->opt_remote = 1; |
||
1110 | } |
||
1111 | } |
||
1112 | |||
1113 | if (demand && (eui64_iszero(wo->ourid) || eui64_iszero(wo->hisid))) { |
||
1114 | option_error("local/remote LL address required for demand-dialling\n"); |
||
1115 | exit(1); |
||
1116 | } |
||
1117 | } |
||
1118 | #endif /* PPP_OPTIONS */ |
||
1119 | |||
1120 | #if DEMAND_SUPPORT |
||
1121 | /* |
||
1122 | * ipv6_demand_conf - configure the interface as though |
||
1123 | * IPV6CP were up, for use with dial-on-demand. |
||
1124 | */ |
||
1125 | static int ipv6_demand_conf(int u) { |
||
1126 | ipv6cp_options *wo = &ipv6cp_wantoptions[u]; |
||
1127 | |||
1128 | if (!sif6up(u)) |
||
1129 | return 0; |
||
1130 | |||
1131 | if (!sif6addr(u, wo->ourid, wo->hisid)) |
||
1132 | return 0; |
||
1133 | |||
1134 | if (!sifnpmode(u, PPP_IPV6, NPMODE_QUEUE)) |
||
1135 | return 0; |
||
1136 | |||
1137 | ppp_notice("ipv6_demand_conf"); |
||
1138 | ppp_notice("local LL address %s", llv6_ntoa(wo->ourid)); |
||
1139 | ppp_notice("remote LL address %s", llv6_ntoa(wo->hisid)); |
||
1140 | |||
1141 | return 1; |
||
1142 | } |
||
1143 | #endif /* DEMAND_SUPPORT */ |
||
1144 | |||
1145 | |||
1146 | /* |
||
1147 | * ipv6cp_up - IPV6CP has come UP. |
||
1148 | * |
||
1149 | * Configure the IPv6 network interface appropriately and bring it up. |
||
1150 | */ |
||
1151 | static void ipv6cp_up(fsm *f) { |
||
1152 | ppp_pcb *pcb = f->pcb; |
||
1153 | ipv6cp_options *wo = &pcb->ipv6cp_wantoptions; |
||
1154 | ipv6cp_options *ho = &pcb->ipv6cp_hisoptions; |
||
1155 | ipv6cp_options *go = &pcb->ipv6cp_gotoptions; |
||
1156 | |||
1157 | IPV6CPDEBUG(("ipv6cp: up")); |
||
1158 | |||
1159 | /* |
||
1160 | * We must have a non-zero LL address for both ends of the link. |
||
1161 | */ |
||
1162 | if (!ho->neg_ifaceid) |
||
1163 | ho->hisid = wo->hisid; |
||
1164 | |||
1165 | #if 0 /* UNUSED */ |
||
1166 | if(!no_ifaceid_neg) { |
||
1167 | #endif /* UNUSED */ |
||
1168 | if (eui64_iszero(ho->hisid)) { |
||
1169 | ppp_error("Could not determine remote LL address"); |
||
1170 | ipv6cp_close(f->pcb, "Could not determine remote LL address"); |
||
1171 | return; |
||
1172 | } |
||
1173 | if (eui64_iszero(go->ourid)) { |
||
1174 | ppp_error("Could not determine local LL address"); |
||
1175 | ipv6cp_close(f->pcb, "Could not determine local LL address"); |
||
1176 | return; |
||
1177 | } |
||
1178 | if (eui64_equals(go->ourid, ho->hisid)) { |
||
1179 | ppp_error("local and remote LL addresses are equal"); |
||
1180 | ipv6cp_close(f->pcb, "local and remote LL addresses are equal"); |
||
1181 | return; |
||
1182 | } |
||
1183 | #if 0 /* UNUSED */ |
||
1184 | } |
||
1185 | #endif /* UNUSED */ |
||
1186 | #if 0 /* UNUSED */ |
||
1187 | script_setenv("LLLOCAL", llv6_ntoa(go->ourid), 0); |
||
1188 | script_setenv("LLREMOTE", llv6_ntoa(ho->hisid), 0); |
||
1189 | #endif /* UNUSED */ |
||
1190 | |||
1191 | #ifdef IPV6CP_COMP |
||
1192 | /* set tcp compression */ |
||
1193 | sif6comp(f->unit, ho->neg_vj); |
||
1194 | #endif |
||
1195 | |||
1196 | #if DEMAND_SUPPORT |
||
1197 | /* |
||
1198 | * If we are doing dial-on-demand, the interface is already |
||
1199 | * configured, so we put out any saved-up packets, then set the |
||
1200 | * interface to pass IPv6 packets. |
||
1201 | */ |
||
1202 | if (demand) { |
||
1203 | if (! eui64_equals(go->ourid, wo->ourid) || |
||
1204 | ! eui64_equals(ho->hisid, wo->hisid)) { |
||
1205 | if (! eui64_equals(go->ourid, wo->ourid)) |
||
1206 | warn("Local LL address changed to %s", |
||
1207 | llv6_ntoa(go->ourid)); |
||
1208 | if (! eui64_equals(ho->hisid, wo->hisid)) |
||
1209 | warn("Remote LL address changed to %s", |
||
1210 | llv6_ntoa(ho->hisid)); |
||
1211 | ipv6cp_clear_addrs(f->pcb, go->ourid, ho->hisid); |
||
1212 | |||
1213 | /* Set the interface to the new addresses */ |
||
1214 | if (!sif6addr(f->pcb, go->ourid, ho->hisid)) { |
||
1215 | if (debug) |
||
1216 | warn("sif6addr failed"); |
||
1217 | ipv6cp_close(f->unit, "Interface configuration failed"); |
||
1218 | return; |
||
1219 | } |
||
1220 | |||
1221 | } |
||
1222 | demand_rexmit(PPP_IPV6); |
||
1223 | sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS); |
||
1224 | |||
1225 | } else |
||
1226 | #endif /* DEMAND_SUPPORT */ |
||
1227 | { |
||
1228 | /* |
||
1229 | * Set LL addresses |
||
1230 | */ |
||
1231 | if (!sif6addr(f->pcb, go->ourid, ho->hisid)) { |
||
1232 | PPPDEBUG(LOG_DEBUG, ("sif6addr failed")); |
||
1233 | ipv6cp_close(f->pcb, "Interface configuration failed"); |
||
1234 | return; |
||
1235 | } |
||
1236 | |||
1237 | /* bring the interface up for IPv6 */ |
||
1238 | if (!sif6up(f->pcb)) { |
||
1239 | PPPDEBUG(LOG_DEBUG, ("sif6up failed (IPV6)")); |
||
1240 | ipv6cp_close(f->pcb, "Interface configuration failed"); |
||
1241 | return; |
||
1242 | } |
||
1243 | #if DEMAND_SUPPORT |
||
1244 | sifnpmode(f->pcb, PPP_IPV6, NPMODE_PASS); |
||
1245 | #endif /* DEMAND_SUPPORT */ |
||
1246 | |||
1247 | ppp_notice("local LL address %s", llv6_ntoa(go->ourid)); |
||
1248 | ppp_notice("remote LL address %s", llv6_ntoa(ho->hisid)); |
||
1249 | } |
||
1250 | |||
1251 | np_up(f->pcb, PPP_IPV6); |
||
1252 | pcb->ipv6cp_is_up = 1; |
||
1253 | |||
1254 | #if 0 /* UNUSED */ |
||
1255 | /* |
||
1256 | * Execute the ipv6-up script, like this: |
||
1257 | * /etc/ppp/ipv6-up interface tty speed local-LL remote-LL |
||
1258 | */ |
||
1259 | if (ipv6cp_script_state == s_down && ipv6cp_script_pid == 0) { |
||
1260 | ipv6cp_script_state = s_up; |
||
1261 | ipv6cp_script(_PATH_IPV6UP); |
||
1262 | } |
||
1263 | #endif /* UNUSED */ |
||
1264 | } |
||
1265 | |||
1266 | |||
1267 | /* |
||
1268 | * ipv6cp_down - IPV6CP has gone DOWN. |
||
1269 | * |
||
1270 | * Take the IPv6 network interface down, clear its addresses |
||
1271 | * and delete routes through it. |
||
1272 | */ |
||
1273 | static void ipv6cp_down(fsm *f) { |
||
1274 | ppp_pcb *pcb = f->pcb; |
||
1275 | ipv6cp_options *go = &pcb->ipv6cp_gotoptions; |
||
1276 | ipv6cp_options *ho = &pcb->ipv6cp_hisoptions; |
||
1277 | |||
1278 | IPV6CPDEBUG(("ipv6cp: down")); |
||
1279 | #if PPP_STATS_SUPPORT |
||
1280 | update_link_stats(f->unit); |
||
1281 | #endif /* PPP_STATS_SUPPORT */ |
||
1282 | if (pcb->ipv6cp_is_up) { |
||
1283 | pcb->ipv6cp_is_up = 0; |
||
1284 | np_down(f->pcb, PPP_IPV6); |
||
1285 | } |
||
1286 | #ifdef IPV6CP_COMP |
||
1287 | sif6comp(f->unit, 0); |
||
1288 | #endif |
||
1289 | |||
1290 | #if DEMAND_SUPPORT |
||
1291 | /* |
||
1292 | * If we are doing dial-on-demand, set the interface |
||
1293 | * to queue up outgoing packets (for now). |
||
1294 | */ |
||
1295 | if (demand) { |
||
1296 | sifnpmode(f->pcb, PPP_IPV6, NPMODE_QUEUE); |
||
1297 | } else |
||
1298 | #endif /* DEMAND_SUPPORT */ |
||
1299 | { |
||
1300 | #if DEMAND_SUPPORT |
||
1301 | sifnpmode(f->pcb, PPP_IPV6, NPMODE_DROP); |
||
1302 | #endif /* DEMAND_SUPPORT */ |
||
1303 | ipv6cp_clear_addrs(f->pcb, |
||
1304 | go->ourid, |
||
1305 | ho->hisid); |
||
1306 | sif6down(f->pcb); |
||
1307 | } |
||
1308 | |||
1309 | #if 0 /* UNUSED */ |
||
1310 | /* Execute the ipv6-down script */ |
||
1311 | if (ipv6cp_script_state == s_up && ipv6cp_script_pid == 0) { |
||
1312 | ipv6cp_script_state = s_down; |
||
1313 | ipv6cp_script(_PATH_IPV6DOWN); |
||
1314 | } |
||
1315 | #endif /* UNUSED */ |
||
1316 | } |
||
1317 | |||
1318 | |||
1319 | /* |
||
1320 | * ipv6cp_clear_addrs() - clear the interface addresses, routes, |
||
1321 | * proxy neighbour discovery entries, etc. |
||
1322 | */ |
||
1323 | static void ipv6cp_clear_addrs(ppp_pcb *pcb, eui64_t ourid, eui64_t hisid) { |
||
1324 | cif6addr(pcb, ourid, hisid); |
||
1325 | } |
||
1326 | |||
1327 | |||
1328 | /* |
||
1329 | * ipv6cp_finished - possibly shut down the lower layers. |
||
1330 | */ |
||
1331 | static void ipv6cp_finished(fsm *f) { |
||
1332 | np_finished(f->pcb, PPP_IPV6); |
||
1333 | } |
||
1334 | |||
1335 | |||
1336 | #if 0 /* UNUSED */ |
||
1337 | /* |
||
1338 | * ipv6cp_script_done - called when the ipv6-up or ipv6-down script |
||
1339 | * has finished. |
||
1340 | */ |
||
1341 | static void |
||
1342 | ipv6cp_script_done(arg) |
||
1343 | void *arg; |
||
1344 | { |
||
1345 | ipv6cp_script_pid = 0; |
||
1346 | switch (ipv6cp_script_state) { |
||
1347 | case s_up: |
||
1348 | if (ipv6cp_fsm[0].state != PPP_FSM_OPENED) { |
||
1349 | ipv6cp_script_state = s_down; |
||
1350 | ipv6cp_script(_PATH_IPV6DOWN); |
||
1351 | } |
||
1352 | break; |
||
1353 | case s_down: |
||
1354 | if (ipv6cp_fsm[0].state == PPP_FSM_OPENED) { |
||
1355 | ipv6cp_script_state = s_up; |
||
1356 | ipv6cp_script(_PATH_IPV6UP); |
||
1357 | } |
||
1358 | break; |
||
1359 | } |
||
1360 | } |
||
1361 | |||
1362 | |||
1363 | /* |
||
1364 | * ipv6cp_script - Execute a script with arguments |
||
1365 | * interface-name tty-name speed local-LL remote-LL. |
||
1366 | */ |
||
1367 | static void |
||
1368 | ipv6cp_script(script) |
||
1369 | char *script; |
||
1370 | { |
||
1371 | char strspeed[32], strlocal[32], strremote[32]; |
||
1372 | char *argv[8]; |
||
1373 | |||
1374 | sprintf(strspeed, "%d", baud_rate); |
||
1375 | strcpy(strlocal, llv6_ntoa(ipv6cp_gotoptions[0].ourid)); |
||
1376 | strcpy(strremote, llv6_ntoa(ipv6cp_hisoptions[0].hisid)); |
||
1377 | |||
1378 | argv[0] = script; |
||
1379 | argv[1] = ifname; |
||
1380 | argv[2] = devnam; |
||
1381 | argv[3] = strspeed; |
||
1382 | argv[4] = strlocal; |
||
1383 | argv[5] = strremote; |
||
1384 | argv[6] = ipparam; |
||
1385 | argv[7] = NULL; |
||
1386 | |||
1387 | ipv6cp_script_pid = run_program(script, argv, 0, ipv6cp_script_done, |
||
1388 | NULL, 0); |
||
1389 | } |
||
1390 | #endif /* UNUSED */ |
||
1391 | |||
1392 | #if PRINTPKT_SUPPORT |
||
1393 | /* |
||
1394 | * ipv6cp_printpkt - print the contents of an IPV6CP packet. |
||
1395 | */ |
||
1396 | static const char* const ipv6cp_codenames[] = { |
||
1397 | "ConfReq", "ConfAck", "ConfNak", "ConfRej", |
||
1398 | "TermReq", "TermAck", "CodeRej" |
||
1399 | }; |
||
1400 | |||
1401 | static int ipv6cp_printpkt(const u_char *p, int plen, |
||
1402 | void (*printer)(void *, const char *, ...), void *arg) { |
||
1403 | int code, id, len, olen; |
||
1404 | const u_char *pstart, *optend; |
||
1405 | #ifdef IPV6CP_COMP |
||
1406 | u_short cishort; |
||
1407 | #endif /* IPV6CP_COMP */ |
||
1408 | eui64_t ifaceid; |
||
1409 | |||
1410 | if (plen < HEADERLEN) |
||
1411 | return 0; |
||
1412 | pstart = p; |
||
1413 | GETCHAR(code, p); |
||
1414 | GETCHAR(id, p); |
||
1415 | GETSHORT(len, p); |
||
1416 | if (len < HEADERLEN || len > plen) |
||
1417 | return 0; |
||
1418 | |||
1419 | if (code >= 1 && code <= (int)LWIP_ARRAYSIZE(ipv6cp_codenames)) |
||
1420 | printer(arg, " %s", ipv6cp_codenames[code-1]); |
||
1421 | else |
||
1422 | printer(arg, " code=0x%x", code); |
||
1423 | printer(arg, " id=0x%x", id); |
||
1424 | len -= HEADERLEN; |
||
1425 | switch (code) { |
||
1426 | case CONFREQ: |
||
1427 | case CONFACK: |
||
1428 | case CONFNAK: |
||
1429 | case CONFREJ: |
||
1430 | /* print option list */ |
||
1431 | while (len >= 2) { |
||
1432 | GETCHAR(code, p); |
||
1433 | GETCHAR(olen, p); |
||
1434 | p -= 2; |
||
1435 | if (olen < 2 || olen > len) { |
||
1436 | break; |
||
1437 | } |
||
1438 | printer(arg, " <"); |
||
1439 | len -= olen; |
||
1440 | optend = p + olen; |
||
1441 | switch (code) { |
||
1442 | #ifdef IPV6CP_COMP |
||
1443 | case CI_COMPRESSTYPE: |
||
1444 | if (olen >= CILEN_COMPRESS) { |
||
1445 | p += 2; |
||
1446 | GETSHORT(cishort, p); |
||
1447 | printer(arg, "compress "); |
||
1448 | printer(arg, "0x%x", cishort); |
||
1449 | } |
||
1450 | break; |
||
1451 | #endif /* IPV6CP_COMP */ |
||
1452 | case CI_IFACEID: |
||
1453 | if (olen == CILEN_IFACEID) { |
||
1454 | p += 2; |
||
1455 | eui64_get(ifaceid, p); |
||
1456 | printer(arg, "addr %s", llv6_ntoa(ifaceid)); |
||
1457 | } |
||
1458 | break; |
||
1459 | default: |
||
1460 | break; |
||
1461 | } |
||
1462 | while (p < optend) { |
||
1463 | GETCHAR(code, p); |
||
1464 | printer(arg, " %.2x", code); |
||
1465 | } |
||
1466 | printer(arg, ">"); |
||
1467 | } |
||
1468 | break; |
||
1469 | |||
1470 | case TERMACK: |
||
1471 | case TERMREQ: |
||
1472 | if (len > 0 && *p >= ' ' && *p < 0x7f) { |
||
1473 | printer(arg, " "); |
||
1474 | ppp_print_string(p, len, printer, arg); |
||
1475 | p += len; |
||
1476 | len = 0; |
||
1477 | } |
||
1478 | break; |
||
1479 | default: |
||
1480 | break; |
||
1481 | } |
||
1482 | |||
1483 | /* print the rest of the bytes in the packet */ |
||
1484 | for (; len > 0; --len) { |
||
1485 | GETCHAR(code, p); |
||
1486 | printer(arg, " %.2x", code); |
||
1487 | } |
||
1488 | |||
1489 | return p - pstart; |
||
1490 | } |
||
1491 | #endif /* PRINTPKT_SUPPORT */ |
||
1492 | |||
1493 | #if DEMAND_SUPPORT |
||
1494 | /* |
||
1495 | * ipv6_active_pkt - see if this IP packet is worth bringing the link up for. |
||
1496 | * We don't bring the link up for IP fragments or for TCP FIN packets |
||
1497 | * with no data. |
||
1498 | */ |
||
1499 | #define IP6_HDRLEN 40 /* bytes */ |
||
1500 | #define IP6_NHDR_FRAG 44 /* fragment IPv6 header */ |
||
1501 | #define TCP_HDRLEN 20 |
||
1502 | #define TH_FIN 0x01 |
||
1503 | |||
1504 | /* |
||
1505 | * We use these macros because the IP header may be at an odd address, |
||
1506 | * and some compilers might use word loads to get th_off or ip_hl. |
||
1507 | */ |
||
1508 | |||
1509 | #define get_ip6nh(x) (((unsigned char *)(x))[6]) |
||
1510 | #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4) |
||
1511 | #define get_tcpflags(x) (((unsigned char *)(x))[13]) |
||
1512 | |||
1513 | static int ipv6_active_pkt(u_char *pkt, int len) { |
||
1514 | u_char *tcp; |
||
1515 | |||
1516 | len -= PPP_HDRLEN; |
||
1517 | pkt += PPP_HDRLEN; |
||
1518 | if (len < IP6_HDRLEN) |
||
1519 | return 0; |
||
1520 | if (get_ip6nh(pkt) == IP6_NHDR_FRAG) |
||
1521 | return 0; |
||
1522 | if (get_ip6nh(pkt) != IPPROTO_TCP) |
||
1523 | return 1; |
||
1524 | if (len < IP6_HDRLEN + TCP_HDRLEN) |
||
1525 | return 0; |
||
1526 | tcp = pkt + IP6_HDRLEN; |
||
1527 | if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == IP6_HDRLEN + get_tcpoff(tcp) * 4) |
||
1528 | return 0; |
||
1529 | return 1; |
||
1530 | } |
||
1531 | #endif /* DEMAND_SUPPORT */ |
||
1532 | |||
1533 | #endif /* PPP_SUPPORT && PPP_IPV6_SUPPORT */ |