1 | /* |
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2 | * fsm.c - {Link, IP} Control Protocol Finite State Machine. |
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3 | * |
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4 | * Copyright (c) 1989 Carnegie Mellon University. |
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5 | * All rights reserved. |
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6 | * |
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7 | * Redistribution and use in source and binary forms are permitted |
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8 | * provided that the above copyright notice and this paragraph are |
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9 | * duplicated in all such forms and that any documentation, |
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10 | * advertising materials, and other materials related to such |
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11 | * distribution and use acknowledge that the software was developed |
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12 | * by Carnegie Mellon University. The name of the |
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13 | * University may not be used to endorse or promote products derived |
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14 | * from this software without specific prior written permission. |
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15 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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16 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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17 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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18 | */ |
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19 | |
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20 | #define RCSID "$Id$" |
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21 | |
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22 | /* |
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23 | * TODO: |
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24 | * Randomize fsm id on link/init. |
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25 | * Deal with variable outgoing MTU. |
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26 | */ |
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27 | |
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28 | #include <stdio.h> |
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29 | #include <string.h> |
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30 | #include <sys/types.h> |
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31 | |
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32 | #include "pppd.h" |
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33 | #include "fsm.h" |
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34 | |
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35 | static const char rcsid[] = RCSID; |
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36 | |
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37 | static void fsm_timeout __P((void *)); |
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38 | static void fsm_rconfreq __P((fsm *, int, u_char *, int)); |
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39 | static void fsm_rconfack __P((fsm *, int, u_char *, int)); |
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40 | static void fsm_rconfnakrej __P((fsm *, int, int, u_char *, int)); |
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41 | static void fsm_rtermreq __P((fsm *, int, u_char *, int)); |
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42 | static void fsm_rtermack __P((fsm *)); |
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43 | static void fsm_rcoderej __P((fsm *, u_char *, int)); |
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44 | static void fsm_sconfreq __P((fsm *, int)); |
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45 | |
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46 | #define PROTO_NAME(f) ((f)->callbacks->proto_name) |
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47 | |
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48 | int peer_mru[NUM_PPP]; |
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49 | |
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50 | |
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51 | /* |
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52 | * fsm_init - Initialize fsm. |
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53 | * |
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54 | * Initialize fsm state. |
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55 | */ |
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56 | void |
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57 | fsm_init(f) |
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58 | fsm *f; |
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59 | { |
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60 | f->state = INITIAL; |
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61 | f->flags = 0; |
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62 | f->id = 100; /* XXX Start with random id? */ |
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63 | f->timeouttime = DEFTIMEOUT; |
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64 | f->maxconfreqtransmits = DEFMAXCONFREQS; |
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65 | f->maxtermtransmits = DEFMAXTERMREQS; |
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66 | f->maxnakloops = DEFMAXNAKLOOPS; |
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67 | f->term_reason_len = 0; |
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68 | } |
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69 | |
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70 | |
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71 | /* |
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72 | * fsm_lowerup - The lower layer is up. |
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73 | */ |
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74 | void |
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75 | fsm_lowerup(f) |
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76 | fsm *f; |
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77 | { |
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78 | switch( f->state ){ |
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79 | case INITIAL: |
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80 | f->state = CLOSED; |
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81 | break; |
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82 | |
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83 | case STARTING: |
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84 | if( f->flags & OPT_SILENT ) |
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85 | f->state = STOPPED; |
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86 | else { |
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87 | /* Send an initial configure-request */ |
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88 | fsm_sconfreq(f, 0); |
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89 | f->state = REQSENT; |
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90 | } |
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91 | break; |
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92 | |
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93 | default: |
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94 | FSMDEBUG(("%s: Up event in state %d!", PROTO_NAME(f), f->state)); |
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95 | } |
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96 | } |
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97 | |
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98 | |
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99 | /* |
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100 | * fsm_lowerdown - The lower layer is down. |
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101 | * |
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102 | * Cancel all timeouts and inform upper layers. |
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103 | */ |
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104 | void |
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105 | fsm_lowerdown(f) |
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106 | fsm *f; |
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107 | { |
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108 | switch( f->state ){ |
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109 | case CLOSED: |
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110 | f->state = INITIAL; |
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111 | break; |
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112 | |
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113 | case STOPPED: |
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114 | f->state = STARTING; |
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115 | if( f->callbacks->starting ) |
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116 | (*f->callbacks->starting)(f); |
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117 | break; |
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118 | |
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119 | case CLOSING: |
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120 | f->state = INITIAL; |
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121 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ |
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122 | break; |
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123 | |
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124 | case STOPPING: |
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125 | case REQSENT: |
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126 | case ACKRCVD: |
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127 | case ACKSENT: |
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128 | f->state = STARTING; |
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129 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ |
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130 | break; |
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131 | |
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132 | case OPENED: |
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133 | if( f->callbacks->down ) |
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134 | (*f->callbacks->down)(f); |
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135 | f->state = STARTING; |
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136 | break; |
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137 | |
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138 | default: |
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139 | FSMDEBUG(("%s: Down event in state %d!", PROTO_NAME(f), f->state)); |
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140 | } |
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141 | } |
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142 | |
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143 | |
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144 | /* |
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145 | * fsm_open - Link is allowed to come up. |
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146 | */ |
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147 | void |
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148 | fsm_open(f) |
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149 | fsm *f; |
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150 | { |
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151 | switch( f->state ){ |
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152 | case INITIAL: |
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153 | f->state = STARTING; |
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154 | if( f->callbacks->starting ) |
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155 | (*f->callbacks->starting)(f); |
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156 | break; |
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157 | |
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158 | case CLOSED: |
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159 | if( f->flags & OPT_SILENT ) |
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160 | f->state = STOPPED; |
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161 | else { |
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162 | /* Send an initial configure-request */ |
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163 | fsm_sconfreq(f, 0); |
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164 | f->state = REQSENT; |
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165 | } |
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166 | break; |
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167 | |
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168 | case CLOSING: |
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169 | f->state = STOPPING; |
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170 | /* fall through */ |
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171 | case STOPPED: |
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172 | case OPENED: |
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173 | if( f->flags & OPT_RESTART ){ |
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174 | fsm_lowerdown(f); |
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175 | fsm_lowerup(f); |
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176 | } |
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177 | break; |
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178 | } |
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179 | } |
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180 | |
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181 | |
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182 | /* |
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183 | * fsm_close - Start closing connection. |
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184 | * |
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185 | * Cancel timeouts and either initiate close or possibly go directly to |
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186 | * the CLOSED state. |
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187 | */ |
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188 | void |
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189 | fsm_close(f, reason) |
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190 | fsm *f; |
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191 | char *reason; |
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192 | { |
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193 | f->term_reason = reason; |
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194 | f->term_reason_len = (reason == NULL? 0: strlen(reason)); |
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195 | switch( f->state ){ |
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196 | case STARTING: |
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197 | f->state = INITIAL; |
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198 | break; |
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199 | case STOPPED: |
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200 | f->state = CLOSED; |
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201 | break; |
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202 | case STOPPING: |
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203 | f->state = CLOSING; |
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204 | break; |
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205 | |
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206 | case REQSENT: |
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207 | case ACKRCVD: |
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208 | case ACKSENT: |
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209 | case OPENED: |
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210 | if( f->state != OPENED ) |
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211 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ |
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212 | else if( f->callbacks->down ) |
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213 | (*f->callbacks->down)(f); /* Inform upper layers we're down */ |
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214 | |
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215 | /* Init restart counter, send Terminate-Request */ |
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216 | f->retransmits = f->maxtermtransmits; |
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217 | fsm_sdata(f, TERMREQ, f->reqid = ++f->id, |
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218 | (u_char *) f->term_reason, f->term_reason_len); |
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219 | TIMEOUT(fsm_timeout, f, f->timeouttime); |
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220 | --f->retransmits; |
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221 | |
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222 | f->state = CLOSING; |
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223 | break; |
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224 | } |
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225 | } |
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226 | |
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227 | |
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228 | /* |
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229 | * fsm_timeout - Timeout expired. |
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230 | */ |
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231 | static void |
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232 | fsm_timeout(arg) |
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233 | void *arg; |
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234 | { |
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235 | fsm *f = (fsm *) arg; |
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236 | |
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237 | switch (f->state) { |
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238 | case CLOSING: |
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239 | case STOPPING: |
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240 | if( f->retransmits <= 0 ){ |
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241 | /* |
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242 | * We've waited for an ack long enough. Peer probably heard us. |
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243 | */ |
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244 | f->state = (f->state == CLOSING)? CLOSED: STOPPED; |
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245 | if( f->callbacks->finished ) |
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246 | (*f->callbacks->finished)(f); |
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247 | } else { |
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248 | /* Send Terminate-Request */ |
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249 | fsm_sdata(f, TERMREQ, f->reqid = ++f->id, |
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250 | (u_char *) f->term_reason, f->term_reason_len); |
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251 | TIMEOUT(fsm_timeout, f, f->timeouttime); |
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252 | --f->retransmits; |
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253 | } |
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254 | break; |
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255 | |
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256 | case REQSENT: |
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257 | case ACKRCVD: |
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258 | case ACKSENT: |
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259 | if (f->retransmits <= 0) { |
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260 | warn("%s: timeout sending Config-Requests\n", PROTO_NAME(f)); |
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261 | f->state = STOPPED; |
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262 | if( (f->flags & OPT_PASSIVE) == 0 && f->callbacks->finished ) |
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263 | (*f->callbacks->finished)(f); |
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264 | |
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265 | } else { |
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266 | /* Retransmit the configure-request */ |
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267 | if (f->callbacks->retransmit) |
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268 | (*f->callbacks->retransmit)(f); |
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269 | fsm_sconfreq(f, 1); /* Re-send Configure-Request */ |
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270 | if( f->state == ACKRCVD ) |
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271 | f->state = REQSENT; |
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272 | } |
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273 | break; |
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274 | |
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275 | default: |
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276 | FSMDEBUG(("%s: Timeout event in state %d!", PROTO_NAME(f), f->state)); |
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277 | } |
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278 | } |
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279 | |
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280 | |
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281 | /* |
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282 | * fsm_input - Input packet. |
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283 | */ |
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284 | void |
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285 | fsm_input(f, inpacket, l) |
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286 | fsm *f; |
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287 | u_char *inpacket; |
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288 | int l; |
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289 | { |
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290 | u_char *inp; |
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291 | u_char code, id; |
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292 | int len; |
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293 | |
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294 | /* |
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295 | * Parse header (code, id and length). |
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296 | * If packet too short, drop it. |
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297 | */ |
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298 | inp = inpacket; |
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299 | if (l < HEADERLEN) { |
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300 | FSMDEBUG(("fsm_input(%x): Rcvd short header.", f->protocol)); |
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301 | return; |
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302 | } |
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303 | GETCHAR(code, inp); |
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304 | GETCHAR(id, inp); |
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305 | GETSHORT(len, inp); |
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306 | if (len < HEADERLEN) { |
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307 | FSMDEBUG(("fsm_input(%x): Rcvd illegal length.", f->protocol)); |
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308 | return; |
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309 | } |
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310 | if (len > l) { |
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311 | FSMDEBUG(("fsm_input(%x): Rcvd short packet.", f->protocol)); |
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312 | return; |
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313 | } |
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314 | len -= HEADERLEN; /* subtract header length */ |
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315 | |
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316 | if( f->state == INITIAL || f->state == STARTING ){ |
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317 | FSMDEBUG(("fsm_input(%x): Rcvd packet in state %d.", |
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318 | f->protocol, f->state)); |
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319 | return; |
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320 | } |
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321 | |
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322 | /* |
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323 | * Action depends on code. |
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324 | */ |
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325 | switch (code) { |
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326 | case CONFREQ: |
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327 | fsm_rconfreq(f, id, inp, len); |
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328 | break; |
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329 | |
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330 | case CONFACK: |
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331 | fsm_rconfack(f, id, inp, len); |
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332 | break; |
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333 | |
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334 | case CONFNAK: |
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335 | case CONFREJ: |
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336 | fsm_rconfnakrej(f, code, id, inp, len); |
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337 | break; |
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338 | |
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339 | case TERMREQ: |
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340 | fsm_rtermreq(f, id, inp, len); |
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341 | break; |
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342 | |
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343 | case TERMACK: |
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344 | fsm_rtermack(f); |
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345 | break; |
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346 | |
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347 | case CODEREJ: |
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348 | fsm_rcoderej(f, inp, len); |
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349 | break; |
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350 | |
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351 | default: |
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352 | if( !f->callbacks->extcode |
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353 | || !(*f->callbacks->extcode)(f, code, id, inp, len) ) |
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354 | fsm_sdata(f, CODEREJ, ++f->id, inpacket, len + HEADERLEN); |
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355 | break; |
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356 | } |
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357 | } |
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358 | |
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359 | |
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360 | /* |
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361 | * fsm_rconfreq - Receive Configure-Request. |
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362 | */ |
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363 | static void |
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364 | fsm_rconfreq(f, id, inp, len) |
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365 | fsm *f; |
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366 | u_char id; |
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367 | u_char *inp; |
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368 | int len; |
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369 | { |
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370 | int code, reject_if_disagree; |
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371 | |
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372 | switch( f->state ){ |
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373 | case CLOSED: |
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374 | /* Go away, we're closed */ |
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375 | fsm_sdata(f, TERMACK, id, NULL, 0); |
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376 | return; |
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377 | case CLOSING: |
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378 | case STOPPING: |
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379 | return; |
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380 | |
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381 | case OPENED: |
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382 | /* Go down and restart negotiation */ |
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383 | if( f->callbacks->down ) |
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384 | (*f->callbacks->down)(f); /* Inform upper layers */ |
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385 | fsm_sconfreq(f, 0); /* Send initial Configure-Request */ |
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386 | break; |
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387 | |
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388 | case STOPPED: |
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389 | /* Negotiation started by our peer */ |
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390 | fsm_sconfreq(f, 0); /* Send initial Configure-Request */ |
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391 | f->state = REQSENT; |
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392 | break; |
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393 | } |
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394 | |
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395 | /* |
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396 | * Pass the requested configuration options |
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397 | * to protocol-specific code for checking. |
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398 | */ |
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399 | if (f->callbacks->reqci){ /* Check CI */ |
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400 | reject_if_disagree = (f->nakloops >= f->maxnakloops); |
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401 | code = (*f->callbacks->reqci)(f, inp, &len, reject_if_disagree); |
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402 | } else if (len) |
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403 | code = CONFREJ; /* Reject all CI */ |
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404 | else |
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405 | code = CONFACK; |
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406 | |
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407 | /* send the Ack, Nak or Rej to the peer */ |
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408 | fsm_sdata(f, code, id, inp, len); |
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409 | |
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410 | if (code == CONFACK) { |
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411 | if (f->state == ACKRCVD) { |
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412 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ |
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413 | f->state = OPENED; |
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414 | if (f->callbacks->up) |
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415 | (*f->callbacks->up)(f); /* Inform upper layers */ |
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416 | } else { |
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417 | f->state = ACKSENT; |
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418 | ppp_delay(); |
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419 | } |
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420 | f->nakloops = 0; |
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421 | |
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422 | } else { |
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423 | /* we sent CONFACK or CONFREJ */ |
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424 | if (f->state != ACKRCVD) |
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425 | f->state = REQSENT; |
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426 | if( code == CONFNAK ) |
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427 | ++f->nakloops; |
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428 | } |
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429 | } |
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430 | |
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431 | |
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432 | /* |
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433 | * fsm_rconfack - Receive Configure-Ack. |
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434 | */ |
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435 | static void |
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436 | fsm_rconfack(f, id, inp, len) |
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437 | fsm *f; |
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438 | int id; |
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439 | u_char *inp; |
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440 | int len; |
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441 | { |
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442 | if (id != f->reqid || f->seen_ack) /* Expected id? */ |
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443 | return; /* Nope, toss... */ |
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444 | if( !(f->callbacks->ackci? (*f->callbacks->ackci)(f, inp, len): |
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445 | (len == 0)) ){ |
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446 | /* Ack is bad - ignore it */ |
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447 | error("Received bad configure-ack: %P", inp, len); |
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448 | return; |
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449 | } |
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450 | f->seen_ack = 1; |
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451 | |
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452 | switch (f->state) { |
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453 | case CLOSED: |
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454 | case STOPPED: |
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455 | fsm_sdata(f, TERMACK, id, NULL, 0); |
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456 | break; |
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457 | |
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458 | case REQSENT: |
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459 | f->state = ACKRCVD; |
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460 | f->retransmits = f->maxconfreqtransmits; |
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461 | break; |
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462 | |
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463 | case ACKRCVD: |
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464 | /* Huh? an extra valid Ack? oh well... */ |
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465 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ |
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466 | fsm_sconfreq(f, 0); |
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467 | f->state = REQSENT; |
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468 | break; |
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469 | |
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470 | case ACKSENT: |
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471 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ |
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472 | f->state = OPENED; |
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473 | f->retransmits = f->maxconfreqtransmits; |
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474 | if (f->callbacks->up) |
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475 | (*f->callbacks->up)(f); /* Inform upper layers */ |
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476 | break; |
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477 | |
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478 | case OPENED: |
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479 | /* Go down and restart negotiation */ |
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480 | if (f->callbacks->down) |
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481 | (*f->callbacks->down)(f); /* Inform upper layers */ |
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482 | fsm_sconfreq(f, 0); /* Send initial Configure-Request */ |
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483 | f->state = REQSENT; |
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484 | break; |
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485 | } |
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486 | } |
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487 | |
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488 | |
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489 | /* |
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490 | * fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject. |
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491 | */ |
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492 | static void |
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493 | fsm_rconfnakrej(f, code, id, inp, len) |
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494 | fsm *f; |
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495 | int code, id; |
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496 | u_char *inp; |
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497 | int len; |
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498 | { |
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499 | int (*proc) __P((fsm *, u_char *, int)); |
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500 | int ret; |
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501 | |
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502 | if (id != f->reqid || f->seen_ack) /* Expected id? */ |
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503 | return; /* Nope, toss... */ |
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504 | proc = (code == CONFNAK)? f->callbacks->nakci: f->callbacks->rejci; |
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505 | if (!proc || !(ret = proc(f, inp, len))) { |
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506 | /* Nak/reject is bad - ignore it */ |
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507 | error("Received bad configure-nak/rej: %P", inp, len); |
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508 | return; |
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509 | } |
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510 | f->seen_ack = 1; |
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511 | |
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512 | switch (f->state) { |
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513 | case CLOSED: |
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514 | case STOPPED: |
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515 | fsm_sdata(f, TERMACK, id, NULL, 0); |
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516 | break; |
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517 | |
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518 | case REQSENT: |
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519 | case ACKSENT: |
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520 | /* They didn't agree to what we wanted - try another request */ |
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521 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ |
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522 | if (ret < 0) |
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523 | f->state = STOPPED; /* kludge for stopping CCP */ |
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524 | else |
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525 | fsm_sconfreq(f, 0); /* Send Configure-Request */ |
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526 | break; |
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527 | |
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528 | case ACKRCVD: |
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529 | /* Got a Nak/reject when we had already had an Ack?? oh well... */ |
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530 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ |
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531 | fsm_sconfreq(f, 0); |
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532 | f->state = REQSENT; |
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533 | break; |
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534 | |
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535 | case OPENED: |
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536 | /* Go down and restart negotiation */ |
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537 | if (f->callbacks->down) |
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538 | (*f->callbacks->down)(f); /* Inform upper layers */ |
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539 | fsm_sconfreq(f, 0); /* Send initial Configure-Request */ |
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540 | f->state = REQSENT; |
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541 | break; |
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542 | } |
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543 | } |
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544 | |
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545 | |
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546 | /* |
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547 | * fsm_rtermreq - Receive Terminate-Req. |
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548 | */ |
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549 | static void |
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550 | fsm_rtermreq(f, id, p, len) |
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551 | fsm *f; |
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552 | int id; |
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553 | u_char *p; |
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554 | int len; |
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555 | { |
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556 | switch (f->state) { |
---|
557 | case ACKRCVD: |
---|
558 | case ACKSENT: |
---|
559 | f->state = REQSENT; /* Start over but keep trying */ |
---|
560 | break; |
---|
561 | |
---|
562 | case OPENED: |
---|
563 | if (len > 0) { |
---|
564 | info("%s terminated by peer (%0.*v)", PROTO_NAME(f), len, p); |
---|
565 | } else |
---|
566 | info("%s terminated by peer", PROTO_NAME(f)); |
---|
567 | if (f->callbacks->down) |
---|
568 | (*f->callbacks->down)(f); /* Inform upper layers */ |
---|
569 | f->retransmits = 0; |
---|
570 | f->state = STOPPING; |
---|
571 | TIMEOUT(fsm_timeout, f, f->timeouttime); |
---|
572 | break; |
---|
573 | } |
---|
574 | |
---|
575 | fsm_sdata(f, TERMACK, id, NULL, 0); |
---|
576 | } |
---|
577 | |
---|
578 | |
---|
579 | /* |
---|
580 | * fsm_rtermack - Receive Terminate-Ack. |
---|
581 | */ |
---|
582 | static void |
---|
583 | fsm_rtermack(f) |
---|
584 | fsm *f; |
---|
585 | { |
---|
586 | switch (f->state) { |
---|
587 | case CLOSING: |
---|
588 | UNTIMEOUT(fsm_timeout, f); |
---|
589 | f->state = CLOSED; |
---|
590 | if( f->callbacks->finished ) |
---|
591 | (*f->callbacks->finished)(f); |
---|
592 | break; |
---|
593 | case STOPPING: |
---|
594 | UNTIMEOUT(fsm_timeout, f); |
---|
595 | f->state = STOPPED; |
---|
596 | if( f->callbacks->finished ) |
---|
597 | (*f->callbacks->finished)(f); |
---|
598 | break; |
---|
599 | |
---|
600 | case ACKRCVD: |
---|
601 | f->state = REQSENT; |
---|
602 | break; |
---|
603 | |
---|
604 | case OPENED: |
---|
605 | if (f->callbacks->down) |
---|
606 | (*f->callbacks->down)(f); /* Inform upper layers */ |
---|
607 | fsm_sconfreq(f, 0); |
---|
608 | break; |
---|
609 | } |
---|
610 | } |
---|
611 | |
---|
612 | |
---|
613 | /* |
---|
614 | * fsm_rcoderej - Receive an Code-Reject. |
---|
615 | */ |
---|
616 | static void |
---|
617 | fsm_rcoderej(f, inp, len) |
---|
618 | fsm *f; |
---|
619 | u_char *inp; |
---|
620 | int len; |
---|
621 | { |
---|
622 | u_char code, id; |
---|
623 | |
---|
624 | if (len < HEADERLEN) { |
---|
625 | FSMDEBUG(("fsm_rcoderej: Rcvd short Code-Reject packet!")); |
---|
626 | return; |
---|
627 | } |
---|
628 | GETCHAR(code, inp); |
---|
629 | GETCHAR(id, inp); |
---|
630 | warn("%s: Rcvd Code-Reject for code %d, id %d", PROTO_NAME(f), code, id); |
---|
631 | |
---|
632 | if( f->state == ACKRCVD ) |
---|
633 | f->state = REQSENT; |
---|
634 | } |
---|
635 | |
---|
636 | |
---|
637 | /* |
---|
638 | * fsm_protreject - Peer doesn't speak this protocol. |
---|
639 | * |
---|
640 | * Treat this as a catastrophic error (RXJ-). |
---|
641 | */ |
---|
642 | void |
---|
643 | fsm_protreject(f) |
---|
644 | fsm *f; |
---|
645 | { |
---|
646 | switch( f->state ){ |
---|
647 | case CLOSING: |
---|
648 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ |
---|
649 | /* fall through */ |
---|
650 | case CLOSED: |
---|
651 | f->state = CLOSED; |
---|
652 | if( f->callbacks->finished ) |
---|
653 | (*f->callbacks->finished)(f); |
---|
654 | break; |
---|
655 | |
---|
656 | case STOPPING: |
---|
657 | case REQSENT: |
---|
658 | case ACKRCVD: |
---|
659 | case ACKSENT: |
---|
660 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ |
---|
661 | /* fall through */ |
---|
662 | case STOPPED: |
---|
663 | f->state = STOPPED; |
---|
664 | if( f->callbacks->finished ) |
---|
665 | (*f->callbacks->finished)(f); |
---|
666 | break; |
---|
667 | |
---|
668 | case OPENED: |
---|
669 | if( f->callbacks->down ) |
---|
670 | (*f->callbacks->down)(f); |
---|
671 | |
---|
672 | /* Init restart counter, send Terminate-Request */ |
---|
673 | f->retransmits = f->maxtermtransmits; |
---|
674 | fsm_sdata(f, TERMREQ, f->reqid = ++f->id, |
---|
675 | (u_char *) f->term_reason, f->term_reason_len); |
---|
676 | TIMEOUT(fsm_timeout, f, f->timeouttime); |
---|
677 | --f->retransmits; |
---|
678 | |
---|
679 | f->state = STOPPING; |
---|
680 | break; |
---|
681 | |
---|
682 | default: |
---|
683 | FSMDEBUG(("%s: Protocol-reject event in state %d!", |
---|
684 | PROTO_NAME(f), f->state)); |
---|
685 | } |
---|
686 | } |
---|
687 | |
---|
688 | |
---|
689 | /* |
---|
690 | * fsm_sconfreq - Send a Configure-Request. |
---|
691 | */ |
---|
692 | static void |
---|
693 | fsm_sconfreq(f, retransmit) |
---|
694 | fsm *f; |
---|
695 | int retransmit; |
---|
696 | { |
---|
697 | u_char *outp; |
---|
698 | int cilen; |
---|
699 | |
---|
700 | if( f->state != REQSENT && f->state != ACKRCVD && f->state != ACKSENT ){ |
---|
701 | /* Not currently negotiating - reset options */ |
---|
702 | if( f->callbacks->resetci ) |
---|
703 | (*f->callbacks->resetci)(f); |
---|
704 | f->nakloops = 0; |
---|
705 | } |
---|
706 | |
---|
707 | if( !retransmit ){ |
---|
708 | /* New request - reset retransmission counter, use new ID */ |
---|
709 | f->retransmits = f->maxconfreqtransmits; |
---|
710 | f->reqid = ++f->id; |
---|
711 | } |
---|
712 | |
---|
713 | f->seen_ack = 0; |
---|
714 | |
---|
715 | /* |
---|
716 | * Make up the request packet |
---|
717 | */ |
---|
718 | outp = outpacket_buf + PPP_HDRLEN + HEADERLEN; |
---|
719 | if( f->callbacks->cilen && f->callbacks->addci ){ |
---|
720 | cilen = (*f->callbacks->cilen)(f); |
---|
721 | if( cilen > peer_mru[f->unit] - HEADERLEN ) |
---|
722 | cilen = peer_mru[f->unit] - HEADERLEN; |
---|
723 | if (f->callbacks->addci) |
---|
724 | (*f->callbacks->addci)(f, outp, &cilen); |
---|
725 | } else |
---|
726 | cilen = 0; |
---|
727 | |
---|
728 | /* send the request to our peer */ |
---|
729 | fsm_sdata(f, CONFREQ, f->reqid, outp, cilen); |
---|
730 | |
---|
731 | /* start the retransmit timer */ |
---|
732 | --f->retransmits; |
---|
733 | TIMEOUT(fsm_timeout, f, f->timeouttime); |
---|
734 | } |
---|
735 | |
---|
736 | |
---|
737 | /* |
---|
738 | * fsm_sdata - Send some data. |
---|
739 | * |
---|
740 | * Used for all packets sent to our peer by this module. |
---|
741 | */ |
---|
742 | void |
---|
743 | fsm_sdata(f, code, id, data, datalen) |
---|
744 | fsm *f; |
---|
745 | u_char code, id; |
---|
746 | u_char *data; |
---|
747 | int datalen; |
---|
748 | { |
---|
749 | u_char *outp; |
---|
750 | int outlen; |
---|
751 | |
---|
752 | /* Adjust length to be smaller than MTU */ |
---|
753 | outp = outpacket_buf; |
---|
754 | if (datalen > peer_mru[f->unit] - HEADERLEN) |
---|
755 | datalen = peer_mru[f->unit] - HEADERLEN; |
---|
756 | if (datalen && data != outp + PPP_HDRLEN + HEADERLEN) |
---|
757 | BCOPY(data, outp + PPP_HDRLEN + HEADERLEN, datalen); |
---|
758 | outlen = datalen + HEADERLEN; |
---|
759 | MAKEHEADER(outp, f->protocol); |
---|
760 | PUTCHAR(code, outp); |
---|
761 | PUTCHAR(id, outp); |
---|
762 | PUTSHORT(outlen, outp); |
---|
763 | output(f->unit, outpacket_buf, outlen + PPP_HDRLEN); |
---|
764 | } |
---|