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 | #ifndef lint |
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21 | /* static char rcsid[] = "$Id$"; */ |
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22 | #endif |
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23 | #define log_packet(p, len, prefix, level) |
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24 | /* |
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25 | * TODO: |
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26 | * Randomize fsm id on link/init. |
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27 | * Deal with variable outgoing MTU. |
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28 | */ |
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29 | |
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30 | #include <stdio.h> |
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31 | #include <string.h> |
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32 | #include <sys/types.h> |
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33 | #include <syslog.h> |
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34 | |
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35 | #include "pppd.h" |
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36 | #include "fsm.h" |
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37 | |
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38 | static void fsm_timeout __P((void *)); |
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39 | static void fsm_rconfreq __P((fsm *, int, u_char *, int)); |
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40 | static void fsm_rconfack __P((fsm *, int, u_char *, int)); |
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41 | static void fsm_rconfnakrej __P((fsm *, int, int, u_char *, int)); |
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42 | static void fsm_rtermreq __P((fsm *, int, u_char *, int)); |
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43 | static void fsm_rtermack __P((fsm *)); |
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44 | static void fsm_rcoderej __P((fsm *, u_char *, int)); |
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45 | static void fsm_sconfreq __P((fsm *, int)); |
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46 | |
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47 | #define PROTO_NAME(f) ((f)->callbacks->proto_name) |
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48 | |
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49 | int peer_mru[NUM_PPP]; |
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50 | |
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51 | |
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52 | /* |
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53 | * fsm_init - Initialize fsm. |
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54 | * |
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55 | * Initialize fsm state. |
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56 | */ |
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57 | void |
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58 | fsm_init(f) |
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59 | fsm *f; |
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60 | { |
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61 | f->state = INITIAL; |
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62 | f->flags = 0; |
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63 | f->id = 0; /* XXX Start with random id? */ |
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64 | f->timeouttime = DEFTIMEOUT; |
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65 | f->maxconfreqtransmits = DEFMAXCONFREQS; |
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66 | f->maxtermtransmits = DEFMAXTERMREQS; |
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67 | f->maxnakloops = DEFMAXNAKLOOPS; |
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68 | f->term_reason_len = 0; |
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69 | } |
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70 | |
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71 | |
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72 | /* |
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73 | * fsm_lowerup - The lower layer is up. |
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74 | */ |
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75 | void |
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76 | fsm_lowerup(f) |
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77 | fsm *f; |
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78 | { |
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79 | switch( f->state ){ |
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80 | case INITIAL: |
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81 | f->state = CLOSED; |
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82 | break; |
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83 | |
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84 | case STARTING: |
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85 | if( f->flags & OPT_SILENT ) |
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86 | f->state = STOPPED; |
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87 | else { |
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88 | /* Send an initial configure-request */ |
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89 | fsm_sconfreq(f, 0); |
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90 | f->state = REQSENT; |
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91 | } |
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92 | break; |
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93 | |
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94 | default: |
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95 | FSMDEBUG((LOG_INFO, "%s: Up event in state %d!", |
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96 | PROTO_NAME(f), f->state)); |
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97 | } |
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98 | } |
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99 | |
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100 | |
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101 | /* |
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102 | * fsm_lowerdown - The lower layer is down. |
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103 | * |
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104 | * Cancel all timeouts and inform upper layers. |
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105 | */ |
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106 | void |
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107 | fsm_lowerdown(f) |
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108 | fsm *f; |
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109 | { |
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110 | switch( f->state ){ |
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111 | case CLOSED: |
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112 | f->state = INITIAL; |
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113 | break; |
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114 | |
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115 | case STOPPED: |
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116 | f->state = STARTING; |
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117 | if( f->callbacks->starting ) |
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118 | (*f->callbacks->starting)(f); |
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119 | break; |
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120 | |
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121 | case CLOSING: |
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122 | f->state = INITIAL; |
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123 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ |
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124 | break; |
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125 | |
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126 | case STOPPING: |
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127 | case REQSENT: |
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128 | case ACKRCVD: |
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129 | case ACKSENT: |
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130 | f->state = STARTING; |
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131 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ |
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132 | break; |
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133 | |
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134 | case OPENED: |
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135 | if( f->callbacks->down ) |
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136 | (*f->callbacks->down)(f); |
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137 | f->state = STARTING; |
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138 | break; |
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139 | |
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140 | default: |
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141 | FSMDEBUG((LOG_INFO, "%s: Down event in state %d!", |
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142 | PROTO_NAME(f), f->state)); |
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143 | } |
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144 | } |
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145 | |
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146 | |
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147 | /* |
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148 | * fsm_open - Link is allowed to come up. |
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149 | */ |
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150 | void |
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151 | fsm_open(f) |
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152 | fsm *f; |
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153 | { |
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154 | switch( f->state ){ |
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155 | case INITIAL: |
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156 | f->state = STARTING; |
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157 | if( f->callbacks->starting ) |
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158 | (*f->callbacks->starting)(f); |
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159 | break; |
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160 | |
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161 | case CLOSED: |
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162 | if( f->flags & OPT_SILENT ) |
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163 | f->state = STOPPED; |
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164 | else { |
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165 | /* Send an initial configure-request */ |
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166 | fsm_sconfreq(f, 0); |
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167 | f->state = REQSENT; |
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168 | } |
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169 | break; |
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170 | |
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171 | case CLOSING: |
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172 | f->state = STOPPING; |
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173 | /* fall through */ |
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174 | case STOPPED: |
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175 | case OPENED: |
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176 | if( f->flags & OPT_RESTART ){ |
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177 | fsm_lowerdown(f); |
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178 | fsm_lowerup(f); |
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179 | } |
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180 | break; |
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181 | } |
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182 | } |
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183 | |
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184 | |
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185 | /* |
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186 | * fsm_close - Start closing connection. |
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187 | * |
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188 | * Cancel timeouts and either initiate close or possibly go directly to |
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189 | * the CLOSED state. |
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190 | */ |
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191 | void |
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192 | fsm_close(f, reason) |
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193 | fsm *f; |
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194 | char *reason; |
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195 | { |
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196 | f->term_reason = reason; |
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197 | f->term_reason_len = (reason == NULL? 0: strlen(reason)); |
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198 | switch( f->state ){ |
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199 | case STARTING: |
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200 | f->state = INITIAL; |
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201 | break; |
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202 | case STOPPED: |
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203 | f->state = CLOSED; |
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204 | break; |
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205 | case STOPPING: |
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206 | f->state = CLOSING; |
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207 | break; |
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208 | |
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209 | case REQSENT: |
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210 | case ACKRCVD: |
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211 | case ACKSENT: |
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212 | case OPENED: |
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213 | if( f->state != OPENED ) |
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214 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ |
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215 | else if( f->callbacks->down ) |
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216 | (*f->callbacks->down)(f); /* Inform upper layers we're down */ |
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217 | |
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218 | /* Init restart counter, send Terminate-Request */ |
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219 | f->retransmits = f->maxtermtransmits; |
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220 | fsm_sdata(f, TERMREQ, f->reqid = ++f->id, |
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221 | (u_char *) f->term_reason, f->term_reason_len); |
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222 | TIMEOUT(fsm_timeout, f, f->timeouttime); |
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223 | --f->retransmits; |
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224 | |
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225 | f->state = CLOSING; |
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226 | break; |
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227 | } |
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228 | } |
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229 | |
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230 | |
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231 | /* |
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232 | * fsm_timeout - Timeout expired. |
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233 | */ |
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234 | static void |
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235 | fsm_timeout(arg) |
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236 | void *arg; |
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237 | { |
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238 | fsm *f = (fsm *) arg; |
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239 | |
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240 | switch (f->state) { |
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241 | case CLOSING: |
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242 | case STOPPING: |
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243 | if( f->retransmits <= 0 ){ |
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244 | /* |
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245 | * We've waited for an ack long enough. Peer probably heard us. |
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246 | */ |
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247 | f->state = (f->state == CLOSING)? CLOSED: STOPPED; |
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248 | if( f->callbacks->finished ) |
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249 | (*f->callbacks->finished)(f); |
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250 | } else { |
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251 | /* Send Terminate-Request */ |
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252 | fsm_sdata(f, TERMREQ, f->reqid = ++f->id, |
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253 | (u_char *) f->term_reason, f->term_reason_len); |
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254 | TIMEOUT(fsm_timeout, f, f->timeouttime); |
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255 | --f->retransmits; |
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256 | } |
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257 | break; |
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258 | |
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259 | case REQSENT: |
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260 | case ACKRCVD: |
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261 | case ACKSENT: |
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262 | if (f->retransmits <= 0) { |
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263 | syslog(LOG_WARNING, "%s: timeout sending Config-Requests", |
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264 | PROTO_NAME(f)); |
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265 | f->state = STOPPED; |
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266 | if( (f->flags & OPT_PASSIVE) == 0 && f->callbacks->finished ) |
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267 | (*f->callbacks->finished)(f); |
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268 | |
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269 | } else { |
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270 | /* Retransmit the configure-request */ |
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271 | if (f->callbacks->retransmit) |
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272 | (*f->callbacks->retransmit)(f); |
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273 | fsm_sconfreq(f, 1); /* Re-send Configure-Request */ |
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274 | if( f->state == ACKRCVD ) |
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275 | f->state = REQSENT; |
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276 | } |
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277 | break; |
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278 | |
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279 | default: |
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280 | FSMDEBUG((LOG_INFO, "%s: Timeout event in state %d!", |
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281 | PROTO_NAME(f), f->state)); |
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282 | } |
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283 | } |
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284 | |
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285 | |
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286 | /* |
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287 | * fsm_input - Input packet. |
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288 | */ |
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289 | void |
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290 | fsm_input(f, inpacket, l) |
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291 | fsm *f; |
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292 | u_char *inpacket; |
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293 | int l; |
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294 | { |
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295 | u_char *inp; |
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296 | u_char code, id; |
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297 | int len; |
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298 | |
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299 | /* |
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300 | * Parse header (code, id and length). |
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301 | * If packet too short, drop it. |
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302 | */ |
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303 | inp = inpacket; |
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304 | if (l < HEADERLEN) { |
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305 | FSMDEBUG((LOG_WARNING, "fsm_input(%x): Rcvd short header.", |
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306 | f->protocol)); |
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307 | return; |
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308 | } |
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309 | GETCHAR(code, inp); |
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310 | GETCHAR(id, inp); |
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311 | GETSHORT(len, inp); |
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312 | if (len < HEADERLEN) { |
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313 | FSMDEBUG((LOG_INFO, "fsm_input(%x): Rcvd illegal length.", |
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314 | f->protocol)); |
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315 | return; |
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316 | } |
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317 | if (len > l) { |
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318 | FSMDEBUG((LOG_INFO, "fsm_input(%x): Rcvd short packet.", |
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319 | f->protocol)); |
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320 | return; |
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321 | } |
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322 | len -= HEADERLEN; /* subtract header length */ |
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323 | |
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324 | if( f->state == INITIAL || f->state == STARTING ){ |
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325 | FSMDEBUG((LOG_INFO, "fsm_input(%x): Rcvd packet in state %d.", |
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326 | f->protocol, f->state)); |
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327 | return; |
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328 | } |
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329 | |
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330 | /* |
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331 | * Action depends on code. |
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332 | */ |
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333 | switch (code) { |
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334 | case CONFREQ: |
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335 | fsm_rconfreq(f, id, inp, len); |
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336 | break; |
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337 | |
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338 | case CONFACK: |
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339 | fsm_rconfack(f, id, inp, len); |
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340 | break; |
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341 | |
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342 | case CONFNAK: |
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343 | case CONFREJ: |
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344 | fsm_rconfnakrej(f, code, id, inp, len); |
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345 | break; |
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346 | |
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347 | case TERMREQ: |
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348 | fsm_rtermreq(f, id, inp, len); |
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349 | break; |
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350 | |
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351 | case TERMACK: |
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352 | fsm_rtermack(f); |
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353 | break; |
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354 | |
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355 | case CODEREJ: |
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356 | fsm_rcoderej(f, inp, len); |
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357 | break; |
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358 | |
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359 | default: |
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360 | if( !f->callbacks->extcode |
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361 | || !(*f->callbacks->extcode)(f, code, id, inp, len) ) |
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362 | fsm_sdata(f, CODEREJ, ++f->id, inpacket, len + HEADERLEN); |
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363 | break; |
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364 | } |
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365 | } |
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366 | |
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367 | |
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368 | /* |
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369 | * fsm_rconfreq - Receive Configure-Request. |
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370 | */ |
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371 | static void |
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372 | fsm_rconfreq(f, id, inp, len) |
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373 | fsm *f; |
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374 | u_char id; |
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375 | u_char *inp; |
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376 | int len; |
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377 | { |
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378 | int code, reject_if_disagree; |
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379 | |
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380 | FSMDEBUG((LOG_INFO, "fsm_rconfreq(%s): Rcvd id %d.", PROTO_NAME(f), id)); |
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381 | switch( f->state ){ |
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382 | case CLOSED: |
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383 | /* Go away, we're closed */ |
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384 | fsm_sdata(f, TERMACK, id, NULL, 0); |
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385 | return; |
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386 | case CLOSING: |
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387 | case STOPPING: |
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388 | return; |
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389 | |
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390 | case OPENED: |
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391 | /* Go down and restart negotiation */ |
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392 | if( f->callbacks->down ) |
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393 | (*f->callbacks->down)(f); /* Inform upper layers */ |
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394 | fsm_sconfreq(f, 0); /* Send initial Configure-Request */ |
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395 | break; |
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396 | |
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397 | case STOPPED: |
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398 | /* Negotiation started by our peer */ |
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399 | fsm_sconfreq(f, 0); /* Send initial Configure-Request */ |
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400 | f->state = REQSENT; |
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401 | break; |
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402 | } |
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403 | |
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404 | /* |
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405 | * Pass the requested configuration options |
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406 | * to protocol-specific code for checking. |
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407 | */ |
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408 | if (f->callbacks->reqci){ /* Check CI */ |
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409 | reject_if_disagree = (f->nakloops >= f->maxnakloops); |
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410 | code = (*f->callbacks->reqci)(f, inp, &len, reject_if_disagree); |
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411 | } else if (len) |
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412 | code = CONFREJ; /* Reject all CI */ |
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413 | else |
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414 | code = CONFACK; |
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415 | |
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416 | /* send the Ack, Nak or Rej to the peer */ |
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417 | fsm_sdata(f, code, id, inp, len); |
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418 | |
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419 | if (code == CONFACK) { |
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420 | if (f->state == ACKRCVD) { |
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421 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ |
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422 | f->state = OPENED; |
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423 | if (f->callbacks->up) |
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424 | (*f->callbacks->up)(f); /* Inform upper layers */ |
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425 | } else |
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426 | f->state = ACKSENT; |
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427 | f->nakloops = 0; |
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428 | |
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429 | } else { |
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430 | /* we sent CONFACK or CONFREJ */ |
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431 | if (f->state != ACKRCVD) |
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432 | f->state = REQSENT; |
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433 | if( code == CONFNAK ) |
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434 | ++f->nakloops; |
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435 | } |
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436 | } |
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437 | |
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438 | |
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439 | /* |
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440 | * fsm_rconfack - Receive Configure-Ack. |
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441 | */ |
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442 | static void |
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443 | fsm_rconfack(f, id, inp, len) |
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444 | fsm *f; |
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445 | int id; |
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446 | u_char *inp; |
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447 | int len; |
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448 | { |
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449 | FSMDEBUG((LOG_INFO, "fsm_rconfack(%s): Rcvd id %d.", |
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450 | PROTO_NAME(f), id)); |
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451 | |
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452 | if (id != f->reqid || f->seen_ack) /* Expected id? */ |
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453 | return; /* Nope, toss... */ |
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454 | if( !(f->callbacks->ackci? (*f->callbacks->ackci)(f, inp, len): |
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455 | (len == 0)) ){ |
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456 | /* Ack is bad - ignore it */ |
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457 | log_packet(inp, len, "Received bad configure-ack: ", LOG_ERR); |
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458 | FSMDEBUG((LOG_INFO, "%s: received bad Ack (length %d)", |
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459 | PROTO_NAME(f), len)); |
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460 | return; |
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461 | } |
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462 | f->seen_ack = 1; |
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463 | |
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464 | switch (f->state) { |
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465 | case CLOSED: |
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466 | case STOPPED: |
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467 | fsm_sdata(f, TERMACK, id, NULL, 0); |
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468 | break; |
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469 | |
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470 | case REQSENT: |
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471 | f->state = ACKRCVD; |
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472 | f->retransmits = f->maxconfreqtransmits; |
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473 | break; |
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474 | |
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475 | case ACKRCVD: |
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476 | /* Huh? an extra valid Ack? oh well... */ |
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477 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ |
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478 | fsm_sconfreq(f, 0); |
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479 | f->state = REQSENT; |
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480 | break; |
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481 | |
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482 | case ACKSENT: |
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483 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ |
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484 | f->state = OPENED; |
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485 | f->retransmits = f->maxconfreqtransmits; |
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486 | if (f->callbacks->up) |
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487 | (*f->callbacks->up)(f); /* Inform upper layers */ |
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488 | break; |
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489 | |
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490 | case OPENED: |
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491 | /* Go down and restart negotiation */ |
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492 | if (f->callbacks->down) |
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493 | (*f->callbacks->down)(f); /* Inform upper layers */ |
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494 | fsm_sconfreq(f, 0); /* Send initial Configure-Request */ |
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495 | f->state = REQSENT; |
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496 | break; |
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497 | } |
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498 | } |
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499 | |
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500 | |
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501 | /* |
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502 | * fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject. |
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503 | */ |
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504 | static void |
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505 | fsm_rconfnakrej(f, code, id, inp, len) |
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506 | fsm *f; |
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507 | int code, id; |
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508 | u_char *inp; |
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509 | int len; |
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510 | { |
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511 | int (*proc) __P((fsm *, u_char *, int)); |
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512 | int ret; |
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513 | |
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514 | FSMDEBUG((LOG_INFO, "fsm_rconfnakrej(%s): Rcvd id %d.", |
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515 | PROTO_NAME(f), id)); |
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516 | |
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517 | if (id != f->reqid || f->seen_ack) /* Expected id? */ |
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518 | return; /* Nope, toss... */ |
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519 | proc = (code == CONFNAK)? f->callbacks->nakci: f->callbacks->rejci; |
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520 | if (!proc || !(ret = proc(f, inp, len))) { |
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521 | /* Nak/reject is bad - ignore it */ |
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522 | log_packet(inp, len, "Received bad configure-nak/rej: ", LOG_ERR); |
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523 | FSMDEBUG((LOG_INFO, "%s: received bad %s (length %d)", |
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524 | PROTO_NAME(f), (code==CONFNAK? "Nak": "reject"), len)); |
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525 | return; |
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526 | } |
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527 | f->seen_ack = 1; |
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528 | |
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529 | switch (f->state) { |
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530 | case CLOSED: |
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531 | case STOPPED: |
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532 | fsm_sdata(f, TERMACK, id, NULL, 0); |
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533 | break; |
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534 | |
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535 | case REQSENT: |
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536 | case ACKSENT: |
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537 | /* They didn't agree to what we wanted - try another request */ |
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538 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ |
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539 | if (ret < 0) |
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540 | f->state = STOPPED; /* kludge for stopping CCP */ |
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541 | else |
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542 | fsm_sconfreq(f, 0); /* Send Configure-Request */ |
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543 | break; |
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544 | |
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545 | case ACKRCVD: |
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546 | /* Got a Nak/reject when we had already had an Ack?? oh well... */ |
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547 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ |
---|
548 | fsm_sconfreq(f, 0); |
---|
549 | f->state = REQSENT; |
---|
550 | break; |
---|
551 | |
---|
552 | case OPENED: |
---|
553 | /* Go down and restart negotiation */ |
---|
554 | if (f->callbacks->down) |
---|
555 | (*f->callbacks->down)(f); /* Inform upper layers */ |
---|
556 | fsm_sconfreq(f, 0); /* Send initial Configure-Request */ |
---|
557 | f->state = REQSENT; |
---|
558 | break; |
---|
559 | } |
---|
560 | } |
---|
561 | |
---|
562 | |
---|
563 | /* |
---|
564 | * fsm_rtermreq - Receive Terminate-Req. |
---|
565 | */ |
---|
566 | static void |
---|
567 | fsm_rtermreq(f, id, p, len) |
---|
568 | fsm *f; |
---|
569 | int id; |
---|
570 | u_char *p; |
---|
571 | int len; |
---|
572 | { |
---|
573 | char str[80]; |
---|
574 | |
---|
575 | FSMDEBUG((LOG_INFO, "fsm_rtermreq(%s): Rcvd id %d.", |
---|
576 | PROTO_NAME(f), id)); |
---|
577 | |
---|
578 | switch (f->state) { |
---|
579 | case ACKRCVD: |
---|
580 | case ACKSENT: |
---|
581 | f->state = REQSENT; /* Start over but keep trying */ |
---|
582 | break; |
---|
583 | |
---|
584 | case OPENED: |
---|
585 | if (len > 0) { |
---|
586 | fmtmsg(str, sizeof(str), "%0.*v", len, p); |
---|
587 | syslog(LOG_INFO, "%s terminated by peer (%s)", PROTO_NAME(f), str); |
---|
588 | } else |
---|
589 | syslog(LOG_INFO, "%s terminated by peer", PROTO_NAME(f)); |
---|
590 | if (f->callbacks->down) |
---|
591 | (*f->callbacks->down)(f); /* Inform upper layers */ |
---|
592 | f->retransmits = 0; |
---|
593 | f->state = STOPPING; |
---|
594 | TIMEOUT(fsm_timeout, f, f->timeouttime); |
---|
595 | break; |
---|
596 | } |
---|
597 | |
---|
598 | fsm_sdata(f, TERMACK, id, NULL, 0); |
---|
599 | } |
---|
600 | |
---|
601 | |
---|
602 | /* |
---|
603 | * fsm_rtermack - Receive Terminate-Ack. |
---|
604 | */ |
---|
605 | static void |
---|
606 | fsm_rtermack(f) |
---|
607 | fsm *f; |
---|
608 | { |
---|
609 | FSMDEBUG((LOG_INFO, "fsm_rtermack(%s).", PROTO_NAME(f))); |
---|
610 | |
---|
611 | switch (f->state) { |
---|
612 | case CLOSING: |
---|
613 | UNTIMEOUT(fsm_timeout, f); |
---|
614 | f->state = CLOSED; |
---|
615 | if( f->callbacks->finished ) |
---|
616 | (*f->callbacks->finished)(f); |
---|
617 | break; |
---|
618 | case STOPPING: |
---|
619 | UNTIMEOUT(fsm_timeout, f); |
---|
620 | f->state = STOPPED; |
---|
621 | if( f->callbacks->finished ) |
---|
622 | (*f->callbacks->finished)(f); |
---|
623 | break; |
---|
624 | |
---|
625 | case ACKRCVD: |
---|
626 | f->state = REQSENT; |
---|
627 | break; |
---|
628 | |
---|
629 | case OPENED: |
---|
630 | if (f->callbacks->down) |
---|
631 | (*f->callbacks->down)(f); /* Inform upper layers */ |
---|
632 | fsm_sconfreq(f, 0); |
---|
633 | break; |
---|
634 | } |
---|
635 | } |
---|
636 | |
---|
637 | |
---|
638 | /* |
---|
639 | * fsm_rcoderej - Receive an Code-Reject. |
---|
640 | */ |
---|
641 | static void |
---|
642 | fsm_rcoderej(f, inp, len) |
---|
643 | fsm *f; |
---|
644 | u_char *inp; |
---|
645 | int len; |
---|
646 | { |
---|
647 | u_char code, id; |
---|
648 | |
---|
649 | FSMDEBUG((LOG_INFO, "fsm_rcoderej(%s).", PROTO_NAME(f))); |
---|
650 | |
---|
651 | if (len < HEADERLEN) { |
---|
652 | FSMDEBUG((LOG_INFO, "fsm_rcoderej: Rcvd short Code-Reject packet!")); |
---|
653 | return; |
---|
654 | } |
---|
655 | GETCHAR(code, inp); |
---|
656 | GETCHAR(id, inp); |
---|
657 | syslog(LOG_WARNING, "%s: Rcvd Code-Reject for code %d, id %d", |
---|
658 | PROTO_NAME(f), code, id); |
---|
659 | |
---|
660 | if( f->state == ACKRCVD ) |
---|
661 | f->state = REQSENT; |
---|
662 | } |
---|
663 | |
---|
664 | |
---|
665 | /* |
---|
666 | * fsm_protreject - Peer doesn't speak this protocol. |
---|
667 | * |
---|
668 | * Treat this as a catastrophic error (RXJ-). |
---|
669 | */ |
---|
670 | void |
---|
671 | fsm_protreject(f) |
---|
672 | fsm *f; |
---|
673 | { |
---|
674 | switch( f->state ){ |
---|
675 | case CLOSING: |
---|
676 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ |
---|
677 | /* fall through */ |
---|
678 | case CLOSED: |
---|
679 | f->state = CLOSED; |
---|
680 | if( f->callbacks->finished ) |
---|
681 | (*f->callbacks->finished)(f); |
---|
682 | break; |
---|
683 | |
---|
684 | case STOPPING: |
---|
685 | case REQSENT: |
---|
686 | case ACKRCVD: |
---|
687 | case ACKSENT: |
---|
688 | UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */ |
---|
689 | /* fall through */ |
---|
690 | case STOPPED: |
---|
691 | f->state = STOPPED; |
---|
692 | if( f->callbacks->finished ) |
---|
693 | (*f->callbacks->finished)(f); |
---|
694 | break; |
---|
695 | |
---|
696 | case OPENED: |
---|
697 | if( f->callbacks->down ) |
---|
698 | (*f->callbacks->down)(f); |
---|
699 | |
---|
700 | /* Init restart counter, send Terminate-Request */ |
---|
701 | f->retransmits = f->maxtermtransmits; |
---|
702 | fsm_sdata(f, TERMREQ, f->reqid = ++f->id, |
---|
703 | (u_char *) f->term_reason, f->term_reason_len); |
---|
704 | TIMEOUT(fsm_timeout, f, f->timeouttime); |
---|
705 | --f->retransmits; |
---|
706 | |
---|
707 | f->state = STOPPING; |
---|
708 | break; |
---|
709 | |
---|
710 | default: |
---|
711 | FSMDEBUG((LOG_INFO, "%s: Protocol-reject event in state %d!", |
---|
712 | PROTO_NAME(f), f->state)); |
---|
713 | } |
---|
714 | } |
---|
715 | |
---|
716 | |
---|
717 | /* |
---|
718 | * fsm_sconfreq - Send a Configure-Request. |
---|
719 | */ |
---|
720 | static void |
---|
721 | fsm_sconfreq(f, retransmit) |
---|
722 | fsm *f; |
---|
723 | int retransmit; |
---|
724 | { |
---|
725 | u_char *outp; |
---|
726 | int cilen; |
---|
727 | |
---|
728 | if( f->state != REQSENT && f->state != ACKRCVD && f->state != ACKSENT ){ |
---|
729 | /* Not currently negotiating - reset options */ |
---|
730 | if( f->callbacks->resetci ) |
---|
731 | (*f->callbacks->resetci)(f); |
---|
732 | f->nakloops = 0; |
---|
733 | } |
---|
734 | |
---|
735 | if( !retransmit ){ |
---|
736 | /* New request - reset retransmission counter, use new ID */ |
---|
737 | f->retransmits = f->maxconfreqtransmits; |
---|
738 | f->reqid = ++f->id; |
---|
739 | } |
---|
740 | |
---|
741 | f->seen_ack = 0; |
---|
742 | |
---|
743 | /* |
---|
744 | * Make up the request packet |
---|
745 | */ |
---|
746 | outp = outpacket_buf + PPP_HDRLEN + HEADERLEN; |
---|
747 | if( f->callbacks->cilen && f->callbacks->addci ){ |
---|
748 | cilen = (*f->callbacks->cilen)(f); |
---|
749 | if( cilen > peer_mru[f->unit] - HEADERLEN ) |
---|
750 | cilen = peer_mru[f->unit] - HEADERLEN; |
---|
751 | if (f->callbacks->addci) |
---|
752 | (*f->callbacks->addci)(f, outp, &cilen); |
---|
753 | } else |
---|
754 | cilen = 0; |
---|
755 | |
---|
756 | /* send the request to our peer */ |
---|
757 | fsm_sdata(f, CONFREQ, f->reqid, outp, cilen); |
---|
758 | |
---|
759 | /* start the retransmit timer */ |
---|
760 | --f->retransmits; |
---|
761 | TIMEOUT(fsm_timeout, f, f->timeouttime); |
---|
762 | |
---|
763 | FSMDEBUG((LOG_INFO, "%s: sending Configure-Request, id %d", |
---|
764 | PROTO_NAME(f), f->reqid)); |
---|
765 | } |
---|
766 | |
---|
767 | |
---|
768 | /* |
---|
769 | * fsm_sdata - Send some data. |
---|
770 | * |
---|
771 | * Used for all packets sent to our peer by this module. |
---|
772 | */ |
---|
773 | void |
---|
774 | fsm_sdata(f, code, id, data, datalen) |
---|
775 | fsm *f; |
---|
776 | u_char code, id; |
---|
777 | u_char *data; |
---|
778 | int datalen; |
---|
779 | { |
---|
780 | u_char *outp; |
---|
781 | int outlen; |
---|
782 | |
---|
783 | /* Adjust length to be smaller than MTU */ |
---|
784 | outp = outpacket_buf; |
---|
785 | if (datalen > peer_mru[f->unit] - HEADERLEN) |
---|
786 | datalen = peer_mru[f->unit] - HEADERLEN; |
---|
787 | if (datalen && data != outp + PPP_HDRLEN + HEADERLEN) |
---|
788 | BCOPY(data, outp + PPP_HDRLEN + HEADERLEN, datalen); |
---|
789 | outlen = datalen + HEADERLEN; |
---|
790 | MAKEHEADER(outp, f->protocol); |
---|
791 | PUTCHAR(code, outp); |
---|
792 | PUTCHAR(id, outp); |
---|
793 | PUTSHORT(outlen, outp); |
---|
794 | output(f->unit, outpacket_buf, outlen + PPP_HDRLEN); |
---|
795 | |
---|
796 | FSMDEBUG((LOG_INFO, "fsm_sdata(%s): Sent code %d, id %d.", |
---|
797 | PROTO_NAME(f), code, id)); |
---|
798 | } |
---|