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1 | office | 1 | /* |
2 | * ccp.c - PPP Compression Control Protocol. |
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3 | * |
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4 | * Copyright (c) 1994-2002 Paul Mackerras. All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions |
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8 | * are met: |
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9 | * |
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10 | * 1. Redistributions of source code must retain the above copyright |
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11 | * notice, this list of conditions and the following disclaimer. |
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12 | * |
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13 | * 2. The name(s) of the authors of this software must not be used to |
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14 | * endorse or promote products derived from this software without |
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15 | * prior written permission. |
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16 | * |
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17 | * 3. Redistributions of any form whatsoever must retain the following |
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18 | * acknowledgment: |
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19 | * "This product includes software developed by Paul Mackerras |
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20 | * <paulus@samba.org>". |
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21 | * |
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22 | * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO |
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23 | * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY |
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24 | * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY |
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25 | * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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26 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN |
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27 | * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING |
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28 | * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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29 | */ |
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30 | |||
31 | #include "netif/ppp/ppp_opts.h" |
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32 | #if PPP_SUPPORT && CCP_SUPPORT /* don't build if not configured for use in lwipopts.h */ |
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33 | |||
34 | #include <stdlib.h> |
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35 | #include <string.h> |
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36 | |||
37 | #include "netif/ppp/ppp_impl.h" |
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38 | |||
39 | #include "netif/ppp/fsm.h" |
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40 | #include "netif/ppp/ccp.h" |
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41 | |||
42 | #if MPPE_SUPPORT |
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43 | #include "netif/ppp/lcp.h" /* lcp_close(), lcp_fsm */ |
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44 | #include "netif/ppp/mppe.h" /* mppe_init() */ |
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45 | #endif /* MPPE_SUPPORT */ |
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46 | |||
47 | /* |
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48 | * Unfortunately there is a bug in zlib which means that using a |
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49 | * size of 8 (window size = 256) for Deflate compression will cause |
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50 | * buffer overruns and kernel crashes in the deflate module. |
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51 | * Until this is fixed we only accept sizes in the range 9 .. 15. |
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52 | * Thanks to James Carlson for pointing this out. |
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53 | */ |
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54 | #define DEFLATE_MIN_WORKS 9 |
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55 | |||
56 | /* |
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57 | * Command-line options. |
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58 | */ |
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59 | #if PPP_OPTIONS |
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60 | static int setbsdcomp (char **); |
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61 | static int setdeflate (char **); |
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62 | static char bsd_value[8]; |
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63 | static char deflate_value[8]; |
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64 | |||
65 | /* |
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66 | * Option variables. |
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67 | */ |
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68 | #if MPPE_SUPPORT |
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69 | bool refuse_mppe_stateful = 1; /* Allow stateful mode? */ |
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70 | #endif /* MPPE_SUPPORT */ |
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71 | |||
72 | static option_t ccp_option_list[] = { |
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73 | { "noccp", o_bool, &ccp_protent.enabled_flag, |
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74 | "Disable CCP negotiation" }, |
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75 | { "-ccp", o_bool, &ccp_protent.enabled_flag, |
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76 | "Disable CCP negotiation", OPT_ALIAS }, |
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77 | |||
78 | { "bsdcomp", o_special, (void *)setbsdcomp, |
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79 | "Request BSD-Compress packet compression", |
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80 | OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, bsd_value }, |
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81 | { "nobsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress, |
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82 | "don't allow BSD-Compress", OPT_PRIOSUB | OPT_A2CLR, |
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83 | &ccp_allowoptions[0].bsd_compress }, |
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84 | { "-bsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress, |
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85 | "don't allow BSD-Compress", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR, |
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86 | &ccp_allowoptions[0].bsd_compress }, |
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87 | |||
88 | { "deflate", o_special, (void *)setdeflate, |
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89 | "request Deflate compression", |
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90 | OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, deflate_value }, |
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91 | { "nodeflate", o_bool, &ccp_wantoptions[0].deflate, |
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92 | "don't allow Deflate compression", OPT_PRIOSUB | OPT_A2CLR, |
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93 | &ccp_allowoptions[0].deflate }, |
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94 | { "-deflate", o_bool, &ccp_wantoptions[0].deflate, |
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95 | "don't allow Deflate compression", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR, |
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96 | &ccp_allowoptions[0].deflate }, |
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97 | |||
98 | { "nodeflatedraft", o_bool, &ccp_wantoptions[0].deflate_draft, |
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99 | "don't use draft deflate #", OPT_A2COPY, |
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100 | &ccp_allowoptions[0].deflate_draft }, |
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101 | |||
102 | { "predictor1", o_bool, &ccp_wantoptions[0].predictor_1, |
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103 | "request Predictor-1", OPT_PRIO | 1 }, |
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104 | { "nopredictor1", o_bool, &ccp_wantoptions[0].predictor_1, |
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105 | "don't allow Predictor-1", OPT_PRIOSUB | OPT_A2CLR, |
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106 | &ccp_allowoptions[0].predictor_1 }, |
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107 | { "-predictor1", o_bool, &ccp_wantoptions[0].predictor_1, |
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108 | "don't allow Predictor-1", OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR, |
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109 | &ccp_allowoptions[0].predictor_1 }, |
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110 | |||
111 | #if MPPE_SUPPORT |
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112 | /* MPPE options are symmetrical ... we only set wantoptions here */ |
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113 | { "require-mppe", o_bool, &ccp_wantoptions[0].mppe, |
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114 | "require MPPE encryption", |
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115 | OPT_PRIO | MPPE_OPT_40 | MPPE_OPT_128 }, |
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116 | { "+mppe", o_bool, &ccp_wantoptions[0].mppe, |
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117 | "require MPPE encryption", |
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118 | OPT_ALIAS | OPT_PRIO | MPPE_OPT_40 | MPPE_OPT_128 }, |
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119 | { "nomppe", o_bool, &ccp_wantoptions[0].mppe, |
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120 | "don't allow MPPE encryption", OPT_PRIO }, |
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121 | { "-mppe", o_bool, &ccp_wantoptions[0].mppe, |
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122 | "don't allow MPPE encryption", OPT_ALIAS | OPT_PRIO }, |
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123 | |||
124 | /* We use ccp_allowoptions[0].mppe as a junk var ... it is reset later */ |
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125 | { "require-mppe-40", o_bool, &ccp_allowoptions[0].mppe, |
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126 | "require MPPE 40-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_40, |
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127 | &ccp_wantoptions[0].mppe }, |
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128 | { "+mppe-40", o_bool, &ccp_allowoptions[0].mppe, |
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129 | "require MPPE 40-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_40, |
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130 | &ccp_wantoptions[0].mppe }, |
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131 | { "nomppe-40", o_bool, &ccp_allowoptions[0].mppe, |
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132 | "don't allow MPPE 40-bit encryption", |
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133 | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_40, &ccp_wantoptions[0].mppe }, |
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134 | { "-mppe-40", o_bool, &ccp_allowoptions[0].mppe, |
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135 | "don't allow MPPE 40-bit encryption", |
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136 | OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_40, |
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137 | &ccp_wantoptions[0].mppe }, |
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138 | |||
139 | { "require-mppe-128", o_bool, &ccp_allowoptions[0].mppe, |
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140 | "require MPPE 128-bit encryption", OPT_PRIO | OPT_A2OR | MPPE_OPT_128, |
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141 | &ccp_wantoptions[0].mppe }, |
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142 | { "+mppe-128", o_bool, &ccp_allowoptions[0].mppe, |
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143 | "require MPPE 128-bit encryption", |
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144 | OPT_ALIAS | OPT_PRIO | OPT_A2OR | MPPE_OPT_128, |
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145 | &ccp_wantoptions[0].mppe }, |
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146 | { "nomppe-128", o_bool, &ccp_allowoptions[0].mppe, |
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147 | "don't allow MPPE 128-bit encryption", |
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148 | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_128, &ccp_wantoptions[0].mppe }, |
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149 | { "-mppe-128", o_bool, &ccp_allowoptions[0].mppe, |
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150 | "don't allow MPPE 128-bit encryption", |
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151 | OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLRB | MPPE_OPT_128, |
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152 | &ccp_wantoptions[0].mppe }, |
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153 | |||
154 | /* strange one; we always request stateless, but will we allow stateful? */ |
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155 | { "mppe-stateful", o_bool, &refuse_mppe_stateful, |
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156 | "allow MPPE stateful mode", OPT_PRIO }, |
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157 | { "nomppe-stateful", o_bool, &refuse_mppe_stateful, |
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158 | "disallow MPPE stateful mode", OPT_PRIO | 1 }, |
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159 | #endif /* MPPE_SUPPORT */ |
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160 | |||
161 | { NULL } |
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162 | }; |
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163 | #endif /* PPP_OPTIONS */ |
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164 | |||
165 | /* |
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166 | * Protocol entry points from main code. |
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167 | */ |
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168 | static void ccp_init(ppp_pcb *pcb); |
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169 | static void ccp_open(ppp_pcb *pcb); |
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170 | static void ccp_close(ppp_pcb *pcb, const char *reason); |
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171 | static void ccp_lowerup(ppp_pcb *pcb); |
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172 | static void ccp_lowerdown(ppp_pcb *pcb); |
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173 | static void ccp_input(ppp_pcb *pcb, u_char *pkt, int len); |
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174 | static void ccp_protrej(ppp_pcb *pcb); |
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175 | #if PRINTPKT_SUPPORT |
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176 | static int ccp_printpkt(const u_char *p, int plen, void (*printer) (void *, const char *, ...), void *arg); |
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177 | #endif /* PRINTPKT_SUPPORT */ |
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178 | #if PPP_DATAINPUT |
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179 | static void ccp_datainput(ppp_pcb *pcb, u_char *pkt, int len); |
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180 | #endif /* PPP_DATAINPUT */ |
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181 | |||
182 | const struct protent ccp_protent = { |
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183 | PPP_CCP, |
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184 | ccp_init, |
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185 | ccp_input, |
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186 | ccp_protrej, |
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187 | ccp_lowerup, |
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188 | ccp_lowerdown, |
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189 | ccp_open, |
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190 | ccp_close, |
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191 | #if PRINTPKT_SUPPORT |
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192 | ccp_printpkt, |
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193 | #endif /* PRINTPKT_SUPPORT */ |
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194 | #if PPP_DATAINPUT |
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195 | ccp_datainput, |
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196 | #endif /* PPP_DATAINPUT */ |
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197 | #if PRINTPKT_SUPPORT |
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198 | "CCP", |
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199 | "Compressed", |
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200 | #endif /* PRINTPKT_SUPPORT */ |
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201 | #if PPP_OPTIONS |
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202 | ccp_option_list, |
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203 | NULL, |
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204 | #endif /* PPP_OPTIONS */ |
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205 | #if DEMAND_SUPPORT |
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206 | NULL, |
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207 | NULL |
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208 | #endif /* DEMAND_SUPPORT */ |
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209 | }; |
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210 | |||
211 | /* |
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212 | * Callbacks for fsm code. |
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213 | */ |
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214 | static void ccp_resetci (fsm *); |
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215 | static int ccp_cilen (fsm *); |
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216 | static void ccp_addci (fsm *, u_char *, int *); |
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217 | static int ccp_ackci (fsm *, u_char *, int); |
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218 | static int ccp_nakci (fsm *, u_char *, int, int); |
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219 | static int ccp_rejci (fsm *, u_char *, int); |
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220 | static int ccp_reqci (fsm *, u_char *, int *, int); |
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221 | static void ccp_up (fsm *); |
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222 | static void ccp_down (fsm *); |
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223 | static int ccp_extcode (fsm *, int, int, u_char *, int); |
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224 | static void ccp_rack_timeout (void *); |
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225 | static const char *method_name (ccp_options *, ccp_options *); |
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226 | |||
227 | static const fsm_callbacks ccp_callbacks = { |
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228 | ccp_resetci, |
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229 | ccp_cilen, |
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230 | ccp_addci, |
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231 | ccp_ackci, |
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232 | ccp_nakci, |
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233 | ccp_rejci, |
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234 | ccp_reqci, |
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235 | ccp_up, |
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236 | ccp_down, |
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237 | NULL, |
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238 | NULL, |
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239 | NULL, |
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240 | NULL, |
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241 | ccp_extcode, |
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242 | "CCP" |
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243 | }; |
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244 | |||
245 | /* |
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246 | * Do we want / did we get any compression? |
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247 | */ |
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248 | static int ccp_anycompress(ccp_options *opt) { |
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249 | return (0 |
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250 | #if DEFLATE_SUPPORT |
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251 | || (opt)->deflate |
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252 | #endif /* DEFLATE_SUPPORT */ |
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253 | #if BSDCOMPRESS_SUPPORT |
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254 | || (opt)->bsd_compress |
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255 | #endif /* BSDCOMPRESS_SUPPORT */ |
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256 | #if PREDICTOR_SUPPORT |
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257 | || (opt)->predictor_1 || (opt)->predictor_2 |
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258 | #endif /* PREDICTOR_SUPPORT */ |
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259 | #if MPPE_SUPPORT |
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260 | || (opt)->mppe |
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261 | #endif /* MPPE_SUPPORT */ |
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262 | ); |
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263 | } |
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264 | |||
265 | /* |
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266 | * Local state (mainly for handling reset-reqs and reset-acks). |
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267 | */ |
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268 | #define RACK_PENDING 1 /* waiting for reset-ack */ |
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269 | #define RREQ_REPEAT 2 /* send another reset-req if no reset-ack */ |
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270 | |||
271 | #define RACKTIMEOUT 1 /* second */ |
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272 | |||
273 | #if PPP_OPTIONS |
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274 | /* |
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275 | * Option parsing |
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276 | */ |
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277 | static int |
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278 | setbsdcomp(argv) |
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279 | char **argv; |
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280 | { |
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281 | int rbits, abits; |
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282 | char *str, *endp; |
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283 | |||
284 | str = *argv; |
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285 | abits = rbits = strtol(str, &endp, 0); |
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286 | if (endp != str && *endp == ',') { |
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287 | str = endp + 1; |
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288 | abits = strtol(str, &endp, 0); |
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289 | } |
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290 | if (*endp != 0 || endp == str) { |
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291 | option_error("invalid parameter '%s' for bsdcomp option", *argv); |
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292 | return 0; |
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293 | } |
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294 | if ((rbits != 0 && (rbits < BSD_MIN_BITS || rbits > BSD_MAX_BITS)) |
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295 | || (abits != 0 && (abits < BSD_MIN_BITS || abits > BSD_MAX_BITS))) { |
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296 | option_error("bsdcomp option values must be 0 or %d .. %d", |
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297 | BSD_MIN_BITS, BSD_MAX_BITS); |
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298 | return 0; |
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299 | } |
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300 | if (rbits > 0) { |
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301 | ccp_wantoptions[0].bsd_compress = 1; |
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302 | ccp_wantoptions[0].bsd_bits = rbits; |
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303 | } else |
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304 | ccp_wantoptions[0].bsd_compress = 0; |
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305 | if (abits > 0) { |
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306 | ccp_allowoptions[0].bsd_compress = 1; |
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307 | ccp_allowoptions[0].bsd_bits = abits; |
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308 | } else |
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309 | ccp_allowoptions[0].bsd_compress = 0; |
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310 | ppp_slprintf(bsd_value, sizeof(bsd_value), |
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311 | rbits == abits? "%d": "%d,%d", rbits, abits); |
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312 | |||
313 | return 1; |
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314 | } |
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315 | |||
316 | static int |
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317 | setdeflate(argv) |
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318 | char **argv; |
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319 | { |
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320 | int rbits, abits; |
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321 | char *str, *endp; |
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322 | |||
323 | str = *argv; |
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324 | abits = rbits = strtol(str, &endp, 0); |
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325 | if (endp != str && *endp == ',') { |
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326 | str = endp + 1; |
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327 | abits = strtol(str, &endp, 0); |
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328 | } |
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329 | if (*endp != 0 || endp == str) { |
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330 | option_error("invalid parameter '%s' for deflate option", *argv); |
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331 | return 0; |
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332 | } |
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333 | if ((rbits != 0 && (rbits < DEFLATE_MIN_SIZE || rbits > DEFLATE_MAX_SIZE)) |
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334 | || (abits != 0 && (abits < DEFLATE_MIN_SIZE |
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335 | || abits > DEFLATE_MAX_SIZE))) { |
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336 | option_error("deflate option values must be 0 or %d .. %d", |
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337 | DEFLATE_MIN_SIZE, DEFLATE_MAX_SIZE); |
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338 | return 0; |
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339 | } |
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340 | if (rbits == DEFLATE_MIN_SIZE || abits == DEFLATE_MIN_SIZE) { |
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341 | if (rbits == DEFLATE_MIN_SIZE) |
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342 | rbits = DEFLATE_MIN_WORKS; |
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343 | if (abits == DEFLATE_MIN_SIZE) |
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344 | abits = DEFLATE_MIN_WORKS; |
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345 | warn("deflate option value of %d changed to %d to avoid zlib bug", |
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346 | DEFLATE_MIN_SIZE, DEFLATE_MIN_WORKS); |
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347 | } |
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348 | if (rbits > 0) { |
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349 | ccp_wantoptions[0].deflate = 1; |
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350 | ccp_wantoptions[0].deflate_size = rbits; |
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351 | } else |
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352 | ccp_wantoptions[0].deflate = 0; |
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353 | if (abits > 0) { |
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354 | ccp_allowoptions[0].deflate = 1; |
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355 | ccp_allowoptions[0].deflate_size = abits; |
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356 | } else |
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357 | ccp_allowoptions[0].deflate = 0; |
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358 | ppp_slprintf(deflate_value, sizeof(deflate_value), |
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359 | rbits == abits? "%d": "%d,%d", rbits, abits); |
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360 | |||
361 | return 1; |
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362 | } |
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363 | #endif /* PPP_OPTIONS */ |
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364 | |||
365 | /* |
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366 | * ccp_init - initialize CCP. |
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367 | */ |
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368 | static void ccp_init(ppp_pcb *pcb) { |
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369 | fsm *f = &pcb->ccp_fsm; |
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370 | |||
371 | f->pcb = pcb; |
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372 | f->protocol = PPP_CCP; |
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373 | f->callbacks = &ccp_callbacks; |
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374 | fsm_init(f); |
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375 | |||
376 | #if 0 /* Not necessary, everything is cleared in ppp_new() */ |
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377 | memset(wo, 0, sizeof(*wo)); |
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378 | memset(go, 0, sizeof(*go)); |
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379 | memset(ao, 0, sizeof(*ao)); |
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380 | memset(ho, 0, sizeof(*ho)); |
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381 | #endif /* 0 */ |
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382 | |||
383 | #if DEFLATE_SUPPORT |
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384 | wo->deflate = 1; |
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385 | wo->deflate_size = DEFLATE_MAX_SIZE; |
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386 | wo->deflate_correct = 1; |
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387 | wo->deflate_draft = 1; |
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388 | ao->deflate = 1; |
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389 | ao->deflate_size = DEFLATE_MAX_SIZE; |
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390 | ao->deflate_correct = 1; |
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391 | ao->deflate_draft = 1; |
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392 | #endif /* DEFLATE_SUPPORT */ |
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393 | |||
394 | #if BSDCOMPRESS_SUPPORT |
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395 | wo->bsd_compress = 1; |
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396 | wo->bsd_bits = BSD_MAX_BITS; |
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397 | ao->bsd_compress = 1; |
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398 | ao->bsd_bits = BSD_MAX_BITS; |
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399 | #endif /* BSDCOMPRESS_SUPPORT */ |
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400 | |||
401 | #if PREDICTOR_SUPPORT |
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402 | ao->predictor_1 = 1; |
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403 | #endif /* PREDICTOR_SUPPORT */ |
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404 | } |
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405 | |||
406 | /* |
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407 | * ccp_open - CCP is allowed to come up. |
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408 | */ |
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409 | static void ccp_open(ppp_pcb *pcb) { |
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410 | fsm *f = &pcb->ccp_fsm; |
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411 | ccp_options *go = &pcb->ccp_gotoptions; |
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412 | |||
413 | if (f->state != PPP_FSM_OPENED) |
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414 | ccp_set(pcb, 1, 0, 0, 0); |
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415 | |||
416 | /* |
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417 | * Find out which compressors the kernel supports before |
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418 | * deciding whether to open in silent mode. |
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419 | */ |
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420 | ccp_resetci(f); |
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421 | if (!ccp_anycompress(go)) |
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422 | f->flags |= OPT_SILENT; |
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423 | |||
424 | fsm_open(f); |
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425 | } |
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426 | |||
427 | /* |
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428 | * ccp_close - Terminate CCP. |
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429 | */ |
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430 | static void ccp_close(ppp_pcb *pcb, const char *reason) { |
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431 | fsm *f = &pcb->ccp_fsm; |
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432 | ccp_set(pcb, 0, 0, 0, 0); |
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433 | fsm_close(f, reason); |
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434 | } |
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435 | |||
436 | /* |
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437 | * ccp_lowerup - we may now transmit CCP packets. |
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438 | */ |
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439 | static void ccp_lowerup(ppp_pcb *pcb) { |
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440 | fsm *f = &pcb->ccp_fsm; |
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441 | fsm_lowerup(f); |
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442 | } |
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443 | |||
444 | /* |
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445 | * ccp_lowerdown - we may not transmit CCP packets. |
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446 | */ |
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447 | static void ccp_lowerdown(ppp_pcb *pcb) { |
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448 | fsm *f = &pcb->ccp_fsm; |
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449 | fsm_lowerdown(f); |
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450 | } |
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451 | |||
452 | /* |
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453 | * ccp_input - process a received CCP packet. |
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454 | */ |
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455 | static void ccp_input(ppp_pcb *pcb, u_char *p, int len) { |
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456 | fsm *f = &pcb->ccp_fsm; |
||
457 | ccp_options *go = &pcb->ccp_gotoptions; |
||
458 | int oldstate; |
||
459 | |||
460 | /* |
||
461 | * Check for a terminate-request so we can print a message. |
||
462 | */ |
||
463 | oldstate = f->state; |
||
464 | fsm_input(f, p, len); |
||
465 | if (oldstate == PPP_FSM_OPENED && p[0] == TERMREQ && f->state != PPP_FSM_OPENED) { |
||
466 | ppp_notice("Compression disabled by peer."); |
||
467 | #if MPPE_SUPPORT |
||
468 | if (go->mppe) { |
||
469 | ppp_error("MPPE disabled, closing LCP"); |
||
470 | lcp_close(pcb, "MPPE disabled by peer"); |
||
471 | } |
||
472 | #endif /* MPPE_SUPPORT */ |
||
473 | } |
||
474 | |||
475 | /* |
||
476 | * If we get a terminate-ack and we're not asking for compression, |
||
477 | * close CCP. |
||
478 | */ |
||
479 | if (oldstate == PPP_FSM_REQSENT && p[0] == TERMACK |
||
480 | && !ccp_anycompress(go)) |
||
481 | ccp_close(pcb, "No compression negotiated"); |
||
482 | } |
||
483 | |||
484 | /* |
||
485 | * Handle a CCP-specific code. |
||
486 | */ |
||
487 | static int ccp_extcode(fsm *f, int code, int id, u_char *p, int len) { |
||
488 | ppp_pcb *pcb = f->pcb; |
||
489 | LWIP_UNUSED_ARG(p); |
||
490 | LWIP_UNUSED_ARG(len); |
||
491 | |||
492 | switch (code) { |
||
493 | case CCP_RESETREQ: |
||
494 | if (f->state != PPP_FSM_OPENED) |
||
495 | break; |
||
496 | ccp_reset_comp(pcb); |
||
497 | /* send a reset-ack, which the transmitter will see and |
||
498 | reset its compression state. */ |
||
499 | fsm_sdata(f, CCP_RESETACK, id, NULL, 0); |
||
500 | break; |
||
501 | |||
502 | case CCP_RESETACK: |
||
503 | if ((pcb->ccp_localstate & RACK_PENDING) && id == f->reqid) { |
||
504 | pcb->ccp_localstate &= ~(RACK_PENDING | RREQ_REPEAT); |
||
505 | UNTIMEOUT(ccp_rack_timeout, f); |
||
506 | ccp_reset_decomp(pcb); |
||
507 | } |
||
508 | break; |
||
509 | |||
510 | default: |
||
511 | return 0; |
||
512 | } |
||
513 | |||
514 | return 1; |
||
515 | } |
||
516 | |||
517 | /* |
||
518 | * ccp_protrej - peer doesn't talk CCP. |
||
519 | */ |
||
520 | static void ccp_protrej(ppp_pcb *pcb) { |
||
521 | fsm *f = &pcb->ccp_fsm; |
||
522 | #if MPPE_SUPPORT |
||
523 | ccp_options *go = &pcb->ccp_gotoptions; |
||
524 | #endif /* MPPE_SUPPORT */ |
||
525 | |||
526 | ccp_set(pcb, 0, 0, 0, 0); |
||
527 | fsm_lowerdown(f); |
||
528 | |||
529 | #if MPPE_SUPPORT |
||
530 | if (go->mppe) { |
||
531 | ppp_error("MPPE required but peer negotiation failed"); |
||
532 | lcp_close(pcb, "MPPE required but peer negotiation failed"); |
||
533 | } |
||
534 | #endif /* MPPE_SUPPORT */ |
||
535 | |||
536 | } |
||
537 | |||
538 | /* |
||
539 | * ccp_resetci - initialize at start of negotiation. |
||
540 | */ |
||
541 | static void ccp_resetci(fsm *f) { |
||
542 | ppp_pcb *pcb = f->pcb; |
||
543 | ccp_options *go = &pcb->ccp_gotoptions; |
||
544 | ccp_options *wo = &pcb->ccp_wantoptions; |
||
545 | #if MPPE_SUPPORT |
||
546 | ccp_options *ao = &pcb->ccp_allowoptions; |
||
547 | #endif /* MPPE_SUPPORT */ |
||
548 | #if DEFLATE_SUPPORT || BSDCOMPRESS_SUPPORT || PREDICTOR_SUPPORT |
||
549 | u_char opt_buf[CCP_MAX_OPTION_LENGTH]; |
||
550 | #endif /* DEFLATE_SUPPORT || BSDCOMPRESS_SUPPORT || PREDICTOR_SUPPORT */ |
||
551 | #if DEFLATE_SUPPORT || BSDCOMPRESS_SUPPORT |
||
552 | int res; |
||
553 | #endif /* DEFLATE_SUPPORT || BSDCOMPRESS_SUPPORT */ |
||
554 | |||
555 | #if MPPE_SUPPORT |
||
556 | if (pcb->settings.require_mppe) { |
||
557 | wo->mppe = ao->mppe = |
||
558 | (pcb->settings.refuse_mppe_40 ? 0 : MPPE_OPT_40) |
||
559 | | (pcb->settings.refuse_mppe_128 ? 0 : MPPE_OPT_128); |
||
560 | } |
||
561 | #endif /* MPPE_SUPPORT */ |
||
562 | |||
563 | *go = *wo; |
||
564 | pcb->ccp_all_rejected = 0; |
||
565 | |||
566 | #if MPPE_SUPPORT |
||
567 | if (go->mppe) { |
||
568 | int auth_mschap_bits = pcb->auth_done; |
||
569 | int numbits; |
||
570 | |||
571 | /* |
||
572 | * Start with a basic sanity check: mschap[v2] auth must be in |
||
573 | * exactly one direction. RFC 3079 says that the keys are |
||
574 | * 'derived from the credentials of the peer that initiated the call', |
||
575 | * however the PPP protocol doesn't have such a concept, and pppd |
||
576 | * cannot get this info externally. Instead we do the best we can. |
||
577 | * NB: If MPPE is required, all other compression opts are invalid. |
||
578 | * So, we return right away if we can't do it. |
||
579 | */ |
||
580 | |||
581 | /* Leave only the mschap auth bits set */ |
||
582 | auth_mschap_bits &= (CHAP_MS_WITHPEER | CHAP_MS_PEER | |
||
583 | CHAP_MS2_WITHPEER | CHAP_MS2_PEER); |
||
584 | /* Count the mschap auths */ |
||
585 | auth_mschap_bits >>= CHAP_MS_SHIFT; |
||
586 | numbits = 0; |
||
587 | do { |
||
588 | numbits += auth_mschap_bits & 1; |
||
589 | auth_mschap_bits >>= 1; |
||
590 | } while (auth_mschap_bits); |
||
591 | if (numbits > 1) { |
||
592 | ppp_error("MPPE required, but auth done in both directions."); |
||
593 | lcp_close(pcb, "MPPE required but not available"); |
||
594 | return; |
||
595 | } |
||
596 | if (!numbits) { |
||
597 | ppp_error("MPPE required, but MS-CHAP[v2] auth not performed."); |
||
598 | lcp_close(pcb, "MPPE required but not available"); |
||
599 | return; |
||
600 | } |
||
601 | |||
602 | /* A plugin (eg radius) may not have obtained key material. */ |
||
603 | if (!pcb->mppe_keys_set) { |
||
604 | ppp_error("MPPE required, but keys are not available. " |
||
605 | "Possible plugin problem?"); |
||
606 | lcp_close(pcb, "MPPE required but not available"); |
||
607 | return; |
||
608 | } |
||
609 | |||
610 | /* LM auth not supported for MPPE */ |
||
611 | if (pcb->auth_done & (CHAP_MS_WITHPEER | CHAP_MS_PEER)) { |
||
612 | /* This might be noise */ |
||
613 | if (go->mppe & MPPE_OPT_40) { |
||
614 | ppp_notice("Disabling 40-bit MPPE; MS-CHAP LM not supported"); |
||
615 | go->mppe &= ~MPPE_OPT_40; |
||
616 | wo->mppe &= ~MPPE_OPT_40; |
||
617 | } |
||
618 | } |
||
619 | |||
620 | /* Last check: can we actually negotiate something? */ |
||
621 | if (!(go->mppe & (MPPE_OPT_40 | MPPE_OPT_128))) { |
||
622 | /* Could be misconfig, could be 40-bit disabled above. */ |
||
623 | ppp_error("MPPE required, but both 40-bit and 128-bit disabled."); |
||
624 | lcp_close(pcb, "MPPE required but not available"); |
||
625 | return; |
||
626 | } |
||
627 | |||
628 | /* sync options */ |
||
629 | ao->mppe = go->mppe; |
||
630 | /* MPPE is not compatible with other compression types */ |
||
631 | #if BSDCOMPRESS_SUPPORT |
||
632 | ao->bsd_compress = go->bsd_compress = 0; |
||
633 | #endif /* BSDCOMPRESS_SUPPORT */ |
||
634 | #if PREDICTOR_SUPPORT |
||
635 | ao->predictor_1 = go->predictor_1 = 0; |
||
636 | ao->predictor_2 = go->predictor_2 = 0; |
||
637 | #endif /* PREDICTOR_SUPPORT */ |
||
638 | #if DEFLATE_SUPPORT |
||
639 | ao->deflate = go->deflate = 0; |
||
640 | #endif /* DEFLATE_SUPPORT */ |
||
641 | } |
||
642 | #endif /* MPPE_SUPPORT */ |
||
643 | |||
644 | /* |
||
645 | * Check whether the kernel knows about the various |
||
646 | * compression methods we might request. |
||
647 | */ |
||
648 | #if BSDCOMPRESS_SUPPORT |
||
649 | /* FIXME: we don't need to test if BSD compress is available |
||
650 | * if BSDCOMPRESS_SUPPORT is set, it is. |
||
651 | */ |
||
652 | if (go->bsd_compress) { |
||
653 | opt_buf[0] = CI_BSD_COMPRESS; |
||
654 | opt_buf[1] = CILEN_BSD_COMPRESS; |
||
655 | for (;;) { |
||
656 | if (go->bsd_bits < BSD_MIN_BITS) { |
||
657 | go->bsd_compress = 0; |
||
658 | break; |
||
659 | } |
||
660 | opt_buf[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits); |
||
661 | res = ccp_test(pcb, opt_buf, CILEN_BSD_COMPRESS, 0); |
||
662 | if (res > 0) { |
||
663 | break; |
||
664 | } else if (res < 0) { |
||
665 | go->bsd_compress = 0; |
||
666 | break; |
||
667 | } |
||
668 | go->bsd_bits--; |
||
669 | } |
||
670 | } |
||
671 | #endif /* BSDCOMPRESS_SUPPORT */ |
||
672 | #if DEFLATE_SUPPORT |
||
673 | /* FIXME: we don't need to test if deflate is available |
||
674 | * if DEFLATE_SUPPORT is set, it is. |
||
675 | */ |
||
676 | if (go->deflate) { |
||
677 | if (go->deflate_correct) { |
||
678 | opt_buf[0] = CI_DEFLATE; |
||
679 | opt_buf[1] = CILEN_DEFLATE; |
||
680 | opt_buf[3] = DEFLATE_CHK_SEQUENCE; |
||
681 | for (;;) { |
||
682 | if (go->deflate_size < DEFLATE_MIN_WORKS) { |
||
683 | go->deflate_correct = 0; |
||
684 | break; |
||
685 | } |
||
686 | opt_buf[2] = DEFLATE_MAKE_OPT(go->deflate_size); |
||
687 | res = ccp_test(pcb, opt_buf, CILEN_DEFLATE, 0); |
||
688 | if (res > 0) { |
||
689 | break; |
||
690 | } else if (res < 0) { |
||
691 | go->deflate_correct = 0; |
||
692 | break; |
||
693 | } |
||
694 | go->deflate_size--; |
||
695 | } |
||
696 | } |
||
697 | if (go->deflate_draft) { |
||
698 | opt_buf[0] = CI_DEFLATE_DRAFT; |
||
699 | opt_buf[1] = CILEN_DEFLATE; |
||
700 | opt_buf[3] = DEFLATE_CHK_SEQUENCE; |
||
701 | for (;;) { |
||
702 | if (go->deflate_size < DEFLATE_MIN_WORKS) { |
||
703 | go->deflate_draft = 0; |
||
704 | break; |
||
705 | } |
||
706 | opt_buf[2] = DEFLATE_MAKE_OPT(go->deflate_size); |
||
707 | res = ccp_test(pcb, opt_buf, CILEN_DEFLATE, 0); |
||
708 | if (res > 0) { |
||
709 | break; |
||
710 | } else if (res < 0) { |
||
711 | go->deflate_draft = 0; |
||
712 | break; |
||
713 | } |
||
714 | go->deflate_size--; |
||
715 | } |
||
716 | } |
||
717 | if (!go->deflate_correct && !go->deflate_draft) |
||
718 | go->deflate = 0; |
||
719 | } |
||
720 | #endif /* DEFLATE_SUPPORT */ |
||
721 | #if PREDICTOR_SUPPORT |
||
722 | /* FIXME: we don't need to test if predictor is available, |
||
723 | * if PREDICTOR_SUPPORT is set, it is. |
||
724 | */ |
||
725 | if (go->predictor_1) { |
||
726 | opt_buf[0] = CI_PREDICTOR_1; |
||
727 | opt_buf[1] = CILEN_PREDICTOR_1; |
||
728 | if (ccp_test(pcb, opt_buf, CILEN_PREDICTOR_1, 0) <= 0) |
||
729 | go->predictor_1 = 0; |
||
730 | } |
||
731 | if (go->predictor_2) { |
||
732 | opt_buf[0] = CI_PREDICTOR_2; |
||
733 | opt_buf[1] = CILEN_PREDICTOR_2; |
||
734 | if (ccp_test(pcb, opt_buf, CILEN_PREDICTOR_2, 0) <= 0) |
||
735 | go->predictor_2 = 0; |
||
736 | } |
||
737 | #endif /* PREDICTOR_SUPPORT */ |
||
738 | } |
||
739 | |||
740 | /* |
||
741 | * ccp_cilen - Return total length of our configuration info. |
||
742 | */ |
||
743 | static int ccp_cilen(fsm *f) { |
||
744 | ppp_pcb *pcb = f->pcb; |
||
745 | ccp_options *go = &pcb->ccp_gotoptions; |
||
746 | |||
747 | return 0 |
||
748 | #if BSDCOMPRESS_SUPPORT |
||
749 | + (go->bsd_compress? CILEN_BSD_COMPRESS: 0) |
||
750 | #endif /* BSDCOMPRESS_SUPPORT */ |
||
751 | #if DEFLATE_SUPPORT |
||
752 | + (go->deflate && go->deflate_correct? CILEN_DEFLATE: 0) |
||
753 | + (go->deflate && go->deflate_draft? CILEN_DEFLATE: 0) |
||
754 | #endif /* DEFLATE_SUPPORT */ |
||
755 | #if PREDICTOR_SUPPORT |
||
756 | + (go->predictor_1? CILEN_PREDICTOR_1: 0) |
||
757 | + (go->predictor_2? CILEN_PREDICTOR_2: 0) |
||
758 | #endif /* PREDICTOR_SUPPORT */ |
||
759 | #if MPPE_SUPPORT |
||
760 | + (go->mppe? CILEN_MPPE: 0) |
||
761 | #endif /* MPPE_SUPPORT */ |
||
762 | ; |
||
763 | } |
||
764 | |||
765 | /* |
||
766 | * ccp_addci - put our requests in a packet. |
||
767 | */ |
||
768 | static void ccp_addci(fsm *f, u_char *p, int *lenp) { |
||
769 | ppp_pcb *pcb = f->pcb; |
||
770 | ccp_options *go = &pcb->ccp_gotoptions; |
||
771 | u_char *p0 = p; |
||
772 | |||
773 | /* |
||
774 | * Add the compression types that we can receive, in decreasing |
||
775 | * preference order. |
||
776 | */ |
||
777 | #if MPPE_SUPPORT |
||
778 | if (go->mppe) { |
||
779 | p[0] = CI_MPPE; |
||
780 | p[1] = CILEN_MPPE; |
||
781 | MPPE_OPTS_TO_CI(go->mppe, &p[2]); |
||
782 | mppe_init(pcb, &pcb->mppe_decomp, go->mppe); |
||
783 | p += CILEN_MPPE; |
||
784 | } |
||
785 | #endif /* MPPE_SUPPORT */ |
||
786 | #if DEFLATE_SUPPORT |
||
787 | if (go->deflate) { |
||
788 | if (go->deflate_correct) { |
||
789 | p[0] = CI_DEFLATE; |
||
790 | p[1] = CILEN_DEFLATE; |
||
791 | p[2] = DEFLATE_MAKE_OPT(go->deflate_size); |
||
792 | p[3] = DEFLATE_CHK_SEQUENCE; |
||
793 | p += CILEN_DEFLATE; |
||
794 | } |
||
795 | if (go->deflate_draft) { |
||
796 | p[0] = CI_DEFLATE_DRAFT; |
||
797 | p[1] = CILEN_DEFLATE; |
||
798 | p[2] = p[2 - CILEN_DEFLATE]; |
||
799 | p[3] = DEFLATE_CHK_SEQUENCE; |
||
800 | p += CILEN_DEFLATE; |
||
801 | } |
||
802 | } |
||
803 | #endif /* DEFLATE_SUPPORT */ |
||
804 | #if BSDCOMPRESS_SUPPORT |
||
805 | if (go->bsd_compress) { |
||
806 | p[0] = CI_BSD_COMPRESS; |
||
807 | p[1] = CILEN_BSD_COMPRESS; |
||
808 | p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits); |
||
809 | p += CILEN_BSD_COMPRESS; |
||
810 | } |
||
811 | #endif /* BSDCOMPRESS_SUPPORT */ |
||
812 | #if PREDICTOR_SUPPORT |
||
813 | /* XXX Should Predictor 2 be preferable to Predictor 1? */ |
||
814 | if (go->predictor_1) { |
||
815 | p[0] = CI_PREDICTOR_1; |
||
816 | p[1] = CILEN_PREDICTOR_1; |
||
817 | p += CILEN_PREDICTOR_1; |
||
818 | } |
||
819 | if (go->predictor_2) { |
||
820 | p[0] = CI_PREDICTOR_2; |
||
821 | p[1] = CILEN_PREDICTOR_2; |
||
822 | p += CILEN_PREDICTOR_2; |
||
823 | } |
||
824 | #endif /* PREDICTOR_SUPPORT */ |
||
825 | |||
826 | go->method = (p > p0)? p0[0]: 0; |
||
827 | |||
828 | *lenp = p - p0; |
||
829 | } |
||
830 | |||
831 | /* |
||
832 | * ccp_ackci - process a received configure-ack, and return |
||
833 | * 1 iff the packet was OK. |
||
834 | */ |
||
835 | static int ccp_ackci(fsm *f, u_char *p, int len) { |
||
836 | ppp_pcb *pcb = f->pcb; |
||
837 | ccp_options *go = &pcb->ccp_gotoptions; |
||
838 | #if BSDCOMPRESS_SUPPORT || PREDICTOR_SUPPORT |
||
839 | u_char *p0 = p; |
||
840 | #endif /* BSDCOMPRESS_SUPPORT || PREDICTOR_SUPPORT */ |
||
841 | |||
842 | #if MPPE_SUPPORT |
||
843 | if (go->mppe) { |
||
844 | u_char opt_buf[CILEN_MPPE]; |
||
845 | |||
846 | opt_buf[0] = CI_MPPE; |
||
847 | opt_buf[1] = CILEN_MPPE; |
||
848 | MPPE_OPTS_TO_CI(go->mppe, &opt_buf[2]); |
||
849 | if (len < CILEN_MPPE || memcmp(opt_buf, p, CILEN_MPPE)) |
||
850 | return 0; |
||
851 | p += CILEN_MPPE; |
||
852 | len -= CILEN_MPPE; |
||
853 | /* XXX Cope with first/fast ack */ |
||
854 | if (len == 0) |
||
855 | return 1; |
||
856 | } |
||
857 | #endif /* MPPE_SUPPORT */ |
||
858 | #if DEFLATE_SUPPORT |
||
859 | if (go->deflate) { |
||
860 | if (len < CILEN_DEFLATE |
||
861 | || p[0] != (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT) |
||
862 | || p[1] != CILEN_DEFLATE |
||
863 | || p[2] != DEFLATE_MAKE_OPT(go->deflate_size) |
||
864 | || p[3] != DEFLATE_CHK_SEQUENCE) |
||
865 | return 0; |
||
866 | p += CILEN_DEFLATE; |
||
867 | len -= CILEN_DEFLATE; |
||
868 | /* XXX Cope with first/fast ack */ |
||
869 | if (len == 0) |
||
870 | return 1; |
||
871 | if (go->deflate_correct && go->deflate_draft) { |
||
872 | if (len < CILEN_DEFLATE |
||
873 | || p[0] != CI_DEFLATE_DRAFT |
||
874 | || p[1] != CILEN_DEFLATE |
||
875 | || p[2] != DEFLATE_MAKE_OPT(go->deflate_size) |
||
876 | || p[3] != DEFLATE_CHK_SEQUENCE) |
||
877 | return 0; |
||
878 | p += CILEN_DEFLATE; |
||
879 | len -= CILEN_DEFLATE; |
||
880 | } |
||
881 | } |
||
882 | #endif /* DEFLATE_SUPPORT */ |
||
883 | #if BSDCOMPRESS_SUPPORT |
||
884 | if (go->bsd_compress) { |
||
885 | if (len < CILEN_BSD_COMPRESS |
||
886 | || p[0] != CI_BSD_COMPRESS || p[1] != CILEN_BSD_COMPRESS |
||
887 | || p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits)) |
||
888 | return 0; |
||
889 | p += CILEN_BSD_COMPRESS; |
||
890 | len -= CILEN_BSD_COMPRESS; |
||
891 | /* XXX Cope with first/fast ack */ |
||
892 | if (p == p0 && len == 0) |
||
893 | return 1; |
||
894 | } |
||
895 | #endif /* BSDCOMPRESS_SUPPORT */ |
||
896 | #if PREDICTOR_SUPPORT |
||
897 | if (go->predictor_1) { |
||
898 | if (len < CILEN_PREDICTOR_1 |
||
899 | || p[0] != CI_PREDICTOR_1 || p[1] != CILEN_PREDICTOR_1) |
||
900 | return 0; |
||
901 | p += CILEN_PREDICTOR_1; |
||
902 | len -= CILEN_PREDICTOR_1; |
||
903 | /* XXX Cope with first/fast ack */ |
||
904 | if (p == p0 && len == 0) |
||
905 | return 1; |
||
906 | } |
||
907 | if (go->predictor_2) { |
||
908 | if (len < CILEN_PREDICTOR_2 |
||
909 | || p[0] != CI_PREDICTOR_2 || p[1] != CILEN_PREDICTOR_2) |
||
910 | return 0; |
||
911 | p += CILEN_PREDICTOR_2; |
||
912 | len -= CILEN_PREDICTOR_2; |
||
913 | /* XXX Cope with first/fast ack */ |
||
914 | if (p == p0 && len == 0) |
||
915 | return 1; |
||
916 | } |
||
917 | #endif /* PREDICTOR_SUPPORT */ |
||
918 | |||
919 | if (len != 0) |
||
920 | return 0; |
||
921 | return 1; |
||
922 | } |
||
923 | |||
924 | /* |
||
925 | * ccp_nakci - process received configure-nak. |
||
926 | * Returns 1 iff the nak was OK. |
||
927 | */ |
||
928 | static int ccp_nakci(fsm *f, u_char *p, int len, int treat_as_reject) { |
||
929 | ppp_pcb *pcb = f->pcb; |
||
930 | ccp_options *go = &pcb->ccp_gotoptions; |
||
931 | ccp_options no; /* options we've seen already */ |
||
932 | ccp_options try_; /* options to ask for next time */ |
||
933 | LWIP_UNUSED_ARG(treat_as_reject); |
||
934 | #if !MPPE_SUPPORT && !DEFLATE_SUPPORT && !BSDCOMPRESS_SUPPORT |
||
935 | LWIP_UNUSED_ARG(p); |
||
936 | LWIP_UNUSED_ARG(len); |
||
937 | #endif /* !MPPE_SUPPORT && !DEFLATE_SUPPORT && !BSDCOMPRESS_SUPPORT */ |
||
938 | |||
939 | memset(&no, 0, sizeof(no)); |
||
940 | try_ = *go; |
||
941 | |||
942 | #if MPPE_SUPPORT |
||
943 | if (go->mppe && len >= CILEN_MPPE |
||
944 | && p[0] == CI_MPPE && p[1] == CILEN_MPPE) { |
||
945 | no.mppe = 1; |
||
946 | /* |
||
947 | * Peer wants us to use a different strength or other setting. |
||
948 | * Fail if we aren't willing to use his suggestion. |
||
949 | */ |
||
950 | MPPE_CI_TO_OPTS(&p[2], try_.mppe); |
||
951 | if ((try_.mppe & MPPE_OPT_STATEFUL) && pcb->settings.refuse_mppe_stateful) { |
||
952 | ppp_error("Refusing MPPE stateful mode offered by peer"); |
||
953 | try_.mppe = 0; |
||
954 | } else if (((go->mppe | MPPE_OPT_STATEFUL) & try_.mppe) != try_.mppe) { |
||
955 | /* Peer must have set options we didn't request (suggest) */ |
||
956 | try_.mppe = 0; |
||
957 | } |
||
958 | |||
959 | if (!try_.mppe) { |
||
960 | ppp_error("MPPE required but peer negotiation failed"); |
||
961 | lcp_close(pcb, "MPPE required but peer negotiation failed"); |
||
962 | } |
||
963 | } |
||
964 | #endif /* MPPE_SUPPORT */ |
||
965 | #if DEFLATE_SUPPORT |
||
966 | if (go->deflate && len >= CILEN_DEFLATE |
||
967 | && p[0] == (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT) |
||
968 | && p[1] == CILEN_DEFLATE) { |
||
969 | no.deflate = 1; |
||
970 | /* |
||
971 | * Peer wants us to use a different code size or something. |
||
972 | * Stop asking for Deflate if we don't understand his suggestion. |
||
973 | */ |
||
974 | if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL |
||
975 | || DEFLATE_SIZE(p[2]) < DEFLATE_MIN_WORKS |
||
976 | || p[3] != DEFLATE_CHK_SEQUENCE) |
||
977 | try_.deflate = 0; |
||
978 | else if (DEFLATE_SIZE(p[2]) < go->deflate_size) |
||
979 | try_.deflate_size = DEFLATE_SIZE(p[2]); |
||
980 | p += CILEN_DEFLATE; |
||
981 | len -= CILEN_DEFLATE; |
||
982 | if (go->deflate_correct && go->deflate_draft |
||
983 | && len >= CILEN_DEFLATE && p[0] == CI_DEFLATE_DRAFT |
||
984 | && p[1] == CILEN_DEFLATE) { |
||
985 | p += CILEN_DEFLATE; |
||
986 | len -= CILEN_DEFLATE; |
||
987 | } |
||
988 | } |
||
989 | #endif /* DEFLATE_SUPPORT */ |
||
990 | #if BSDCOMPRESS_SUPPORT |
||
991 | if (go->bsd_compress && len >= CILEN_BSD_COMPRESS |
||
992 | && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) { |
||
993 | no.bsd_compress = 1; |
||
994 | /* |
||
995 | * Peer wants us to use a different number of bits |
||
996 | * or a different version. |
||
997 | */ |
||
998 | if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION) |
||
999 | try_.bsd_compress = 0; |
||
1000 | else if (BSD_NBITS(p[2]) < go->bsd_bits) |
||
1001 | try_.bsd_bits = BSD_NBITS(p[2]); |
||
1002 | p += CILEN_BSD_COMPRESS; |
||
1003 | len -= CILEN_BSD_COMPRESS; |
||
1004 | } |
||
1005 | #endif /* BSDCOMPRESS_SUPPORT */ |
||
1006 | |||
1007 | /* |
||
1008 | * Predictor-1 and 2 have no options, so they can't be Naked. |
||
1009 | * |
||
1010 | * There may be remaining options but we ignore them. |
||
1011 | */ |
||
1012 | |||
1013 | if (f->state != PPP_FSM_OPENED) |
||
1014 | *go = try_; |
||
1015 | return 1; |
||
1016 | } |
||
1017 | |||
1018 | /* |
||
1019 | * ccp_rejci - reject some of our suggested compression methods. |
||
1020 | */ |
||
1021 | static int ccp_rejci(fsm *f, u_char *p, int len) { |
||
1022 | ppp_pcb *pcb = f->pcb; |
||
1023 | ccp_options *go = &pcb->ccp_gotoptions; |
||
1024 | ccp_options try_; /* options to request next time */ |
||
1025 | |||
1026 | try_ = *go; |
||
1027 | |||
1028 | /* |
||
1029 | * Cope with empty configure-rejects by ceasing to send |
||
1030 | * configure-requests. |
||
1031 | */ |
||
1032 | if (len == 0 && pcb->ccp_all_rejected) |
||
1033 | return -1; |
||
1034 | |||
1035 | #if MPPE_SUPPORT |
||
1036 | if (go->mppe && len >= CILEN_MPPE |
||
1037 | && p[0] == CI_MPPE && p[1] == CILEN_MPPE) { |
||
1038 | ppp_error("MPPE required but peer refused"); |
||
1039 | lcp_close(pcb, "MPPE required but peer refused"); |
||
1040 | p += CILEN_MPPE; |
||
1041 | len -= CILEN_MPPE; |
||
1042 | } |
||
1043 | #endif /* MPPE_SUPPORT */ |
||
1044 | #if DEFLATE_SUPPORT |
||
1045 | if (go->deflate_correct && len >= CILEN_DEFLATE |
||
1046 | && p[0] == CI_DEFLATE && p[1] == CILEN_DEFLATE) { |
||
1047 | if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size) |
||
1048 | || p[3] != DEFLATE_CHK_SEQUENCE) |
||
1049 | return 0; /* Rej is bad */ |
||
1050 | try_.deflate_correct = 0; |
||
1051 | p += CILEN_DEFLATE; |
||
1052 | len -= CILEN_DEFLATE; |
||
1053 | } |
||
1054 | if (go->deflate_draft && len >= CILEN_DEFLATE |
||
1055 | && p[0] == CI_DEFLATE_DRAFT && p[1] == CILEN_DEFLATE) { |
||
1056 | if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size) |
||
1057 | || p[3] != DEFLATE_CHK_SEQUENCE) |
||
1058 | return 0; /* Rej is bad */ |
||
1059 | try_.deflate_draft = 0; |
||
1060 | p += CILEN_DEFLATE; |
||
1061 | len -= CILEN_DEFLATE; |
||
1062 | } |
||
1063 | if (!try_.deflate_correct && !try_.deflate_draft) |
||
1064 | try_.deflate = 0; |
||
1065 | #endif /* DEFLATE_SUPPORT */ |
||
1066 | #if BSDCOMPRESS_SUPPORT |
||
1067 | if (go->bsd_compress && len >= CILEN_BSD_COMPRESS |
||
1068 | && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) { |
||
1069 | if (p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits)) |
||
1070 | return 0; |
||
1071 | try_.bsd_compress = 0; |
||
1072 | p += CILEN_BSD_COMPRESS; |
||
1073 | len -= CILEN_BSD_COMPRESS; |
||
1074 | } |
||
1075 | #endif /* BSDCOMPRESS_SUPPORT */ |
||
1076 | #if PREDICTOR_SUPPORT |
||
1077 | if (go->predictor_1 && len >= CILEN_PREDICTOR_1 |
||
1078 | && p[0] == CI_PREDICTOR_1 && p[1] == CILEN_PREDICTOR_1) { |
||
1079 | try_.predictor_1 = 0; |
||
1080 | p += CILEN_PREDICTOR_1; |
||
1081 | len -= CILEN_PREDICTOR_1; |
||
1082 | } |
||
1083 | if (go->predictor_2 && len >= CILEN_PREDICTOR_2 |
||
1084 | && p[0] == CI_PREDICTOR_2 && p[1] == CILEN_PREDICTOR_2) { |
||
1085 | try_.predictor_2 = 0; |
||
1086 | p += CILEN_PREDICTOR_2; |
||
1087 | len -= CILEN_PREDICTOR_2; |
||
1088 | } |
||
1089 | #endif /* PREDICTOR_SUPPORT */ |
||
1090 | |||
1091 | if (len != 0) |
||
1092 | return 0; |
||
1093 | |||
1094 | if (f->state != PPP_FSM_OPENED) |
||
1095 | *go = try_; |
||
1096 | |||
1097 | return 1; |
||
1098 | } |
||
1099 | |||
1100 | /* |
||
1101 | * ccp_reqci - processed a received configure-request. |
||
1102 | * Returns CONFACK, CONFNAK or CONFREJ and the packet modified |
||
1103 | * appropriately. |
||
1104 | */ |
||
1105 | static int ccp_reqci(fsm *f, u_char *p, int *lenp, int dont_nak) { |
||
1106 | ppp_pcb *pcb = f->pcb; |
||
1107 | ccp_options *ho = &pcb->ccp_hisoptions; |
||
1108 | ccp_options *ao = &pcb->ccp_allowoptions; |
||
1109 | int ret, newret; |
||
1110 | #if DEFLATE_SUPPORT || BSDCOMPRESS_SUPPORT |
||
1111 | int res; |
||
1112 | int nb; |
||
1113 | #endif /* DEFLATE_SUPPORT || BSDCOMPRESS_SUPPORT */ |
||
1114 | u_char *p0, *retp; |
||
1115 | int len, clen, type; |
||
1116 | #if MPPE_SUPPORT |
||
1117 | u8_t rej_for_ci_mppe = 1; /* Are we rejecting based on a bad/missing */ |
||
1118 | /* CI_MPPE, or due to other options? */ |
||
1119 | #endif /* MPPE_SUPPORT */ |
||
1120 | |||
1121 | ret = CONFACK; |
||
1122 | retp = p0 = p; |
||
1123 | len = *lenp; |
||
1124 | |||
1125 | memset(ho, 0, sizeof(ccp_options)); |
||
1126 | ho->method = (len > 0)? p[0]: 0; |
||
1127 | |||
1128 | while (len > 0) { |
||
1129 | newret = CONFACK; |
||
1130 | if (len < 2 || p[1] < 2 || p[1] > len) { |
||
1131 | /* length is bad */ |
||
1132 | clen = len; |
||
1133 | newret = CONFREJ; |
||
1134 | |||
1135 | } else { |
||
1136 | type = p[0]; |
||
1137 | clen = p[1]; |
||
1138 | |||
1139 | switch (type) { |
||
1140 | #if MPPE_SUPPORT |
||
1141 | case CI_MPPE: |
||
1142 | if (!ao->mppe || clen != CILEN_MPPE) { |
||
1143 | newret = CONFREJ; |
||
1144 | break; |
||
1145 | } |
||
1146 | MPPE_CI_TO_OPTS(&p[2], ho->mppe); |
||
1147 | |||
1148 | /* Nak if anything unsupported or unknown are set. */ |
||
1149 | if (ho->mppe & MPPE_OPT_UNSUPPORTED) { |
||
1150 | newret = CONFNAK; |
||
1151 | ho->mppe &= ~MPPE_OPT_UNSUPPORTED; |
||
1152 | } |
||
1153 | if (ho->mppe & MPPE_OPT_UNKNOWN) { |
||
1154 | newret = CONFNAK; |
||
1155 | ho->mppe &= ~MPPE_OPT_UNKNOWN; |
||
1156 | } |
||
1157 | |||
1158 | /* Check state opt */ |
||
1159 | if (ho->mppe & MPPE_OPT_STATEFUL) { |
||
1160 | /* |
||
1161 | * We can Nak and request stateless, but it's a |
||
1162 | * lot easier to just assume the peer will request |
||
1163 | * it if he can do it; stateful mode is bad over |
||
1164 | * the Internet -- which is where we expect MPPE. |
||
1165 | */ |
||
1166 | if (pcb->settings.refuse_mppe_stateful) { |
||
1167 | ppp_error("Refusing MPPE stateful mode offered by peer"); |
||
1168 | newret = CONFREJ; |
||
1169 | break; |
||
1170 | } |
||
1171 | } |
||
1172 | |||
1173 | /* Find out which of {S,L} are set. */ |
||
1174 | if ((ho->mppe & MPPE_OPT_128) |
||
1175 | && (ho->mppe & MPPE_OPT_40)) { |
||
1176 | /* Both are set, negotiate the strongest. */ |
||
1177 | newret = CONFNAK; |
||
1178 | if (ao->mppe & MPPE_OPT_128) |
||
1179 | ho->mppe &= ~MPPE_OPT_40; |
||
1180 | else if (ao->mppe & MPPE_OPT_40) |
||
1181 | ho->mppe &= ~MPPE_OPT_128; |
||
1182 | else { |
||
1183 | newret = CONFREJ; |
||
1184 | break; |
||
1185 | } |
||
1186 | } else if (ho->mppe & MPPE_OPT_128) { |
||
1187 | if (!(ao->mppe & MPPE_OPT_128)) { |
||
1188 | newret = CONFREJ; |
||
1189 | break; |
||
1190 | } |
||
1191 | } else if (ho->mppe & MPPE_OPT_40) { |
||
1192 | if (!(ao->mppe & MPPE_OPT_40)) { |
||
1193 | newret = CONFREJ; |
||
1194 | break; |
||
1195 | } |
||
1196 | } else { |
||
1197 | /* Neither are set. */ |
||
1198 | /* We cannot accept this. */ |
||
1199 | newret = CONFNAK; |
||
1200 | /* Give the peer our idea of what can be used, |
||
1201 | so it can choose and confirm */ |
||
1202 | ho->mppe = ao->mppe; |
||
1203 | } |
||
1204 | |||
1205 | /* rebuild the opts */ |
||
1206 | MPPE_OPTS_TO_CI(ho->mppe, &p[2]); |
||
1207 | if (newret == CONFACK) { |
||
1208 | int mtu; |
||
1209 | |||
1210 | mppe_init(pcb, &pcb->mppe_comp, ho->mppe); |
||
1211 | /* |
||
1212 | * We need to decrease the interface MTU by MPPE_PAD |
||
1213 | * because MPPE frames **grow**. The kernel [must] |
||
1214 | * allocate MPPE_PAD extra bytes in xmit buffers. |
||
1215 | */ |
||
1216 | mtu = netif_get_mtu(pcb); |
||
1217 | if (mtu) |
||
1218 | netif_set_mtu(pcb, mtu - MPPE_PAD); |
||
1219 | else |
||
1220 | newret = CONFREJ; |
||
1221 | } |
||
1222 | |||
1223 | /* |
||
1224 | * We have accepted MPPE or are willing to negotiate |
||
1225 | * MPPE parameters. A CONFREJ is due to subsequent |
||
1226 | * (non-MPPE) processing. |
||
1227 | */ |
||
1228 | rej_for_ci_mppe = 0; |
||
1229 | break; |
||
1230 | #endif /* MPPE_SUPPORT */ |
||
1231 | #if DEFLATE_SUPPORT |
||
1232 | case CI_DEFLATE: |
||
1233 | case CI_DEFLATE_DRAFT: |
||
1234 | if (!ao->deflate || clen != CILEN_DEFLATE |
||
1235 | || (!ao->deflate_correct && type == CI_DEFLATE) |
||
1236 | || (!ao->deflate_draft && type == CI_DEFLATE_DRAFT)) { |
||
1237 | newret = CONFREJ; |
||
1238 | break; |
||
1239 | } |
||
1240 | |||
1241 | ho->deflate = 1; |
||
1242 | ho->deflate_size = nb = DEFLATE_SIZE(p[2]); |
||
1243 | if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL |
||
1244 | || p[3] != DEFLATE_CHK_SEQUENCE |
||
1245 | || nb > ao->deflate_size || nb < DEFLATE_MIN_WORKS) { |
||
1246 | newret = CONFNAK; |
||
1247 | if (!dont_nak) { |
||
1248 | p[2] = DEFLATE_MAKE_OPT(ao->deflate_size); |
||
1249 | p[3] = DEFLATE_CHK_SEQUENCE; |
||
1250 | /* fall through to test this #bits below */ |
||
1251 | } else |
||
1252 | break; |
||
1253 | } |
||
1254 | |||
1255 | /* |
||
1256 | * Check whether we can do Deflate with the window |
||
1257 | * size they want. If the window is too big, reduce |
||
1258 | * it until the kernel can cope and nak with that. |
||
1259 | * We only check this for the first option. |
||
1260 | */ |
||
1261 | if (p == p0) { |
||
1262 | for (;;) { |
||
1263 | res = ccp_test(pcb, p, CILEN_DEFLATE, 1); |
||
1264 | if (res > 0) |
||
1265 | break; /* it's OK now */ |
||
1266 | if (res < 0 || nb == DEFLATE_MIN_WORKS || dont_nak) { |
||
1267 | newret = CONFREJ; |
||
1268 | p[2] = DEFLATE_MAKE_OPT(ho->deflate_size); |
||
1269 | break; |
||
1270 | } |
||
1271 | newret = CONFNAK; |
||
1272 | --nb; |
||
1273 | p[2] = DEFLATE_MAKE_OPT(nb); |
||
1274 | } |
||
1275 | } |
||
1276 | break; |
||
1277 | #endif /* DEFLATE_SUPPORT */ |
||
1278 | #if BSDCOMPRESS_SUPPORT |
||
1279 | case CI_BSD_COMPRESS: |
||
1280 | if (!ao->bsd_compress || clen != CILEN_BSD_COMPRESS) { |
||
1281 | newret = CONFREJ; |
||
1282 | break; |
||
1283 | } |
||
1284 | |||
1285 | ho->bsd_compress = 1; |
||
1286 | ho->bsd_bits = nb = BSD_NBITS(p[2]); |
||
1287 | if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION |
||
1288 | || nb > ao->bsd_bits || nb < BSD_MIN_BITS) { |
||
1289 | newret = CONFNAK; |
||
1290 | if (!dont_nak) { |
||
1291 | p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, ao->bsd_bits); |
||
1292 | /* fall through to test this #bits below */ |
||
1293 | } else |
||
1294 | break; |
||
1295 | } |
||
1296 | |||
1297 | /* |
||
1298 | * Check whether we can do BSD-Compress with the code |
||
1299 | * size they want. If the code size is too big, reduce |
||
1300 | * it until the kernel can cope and nak with that. |
||
1301 | * We only check this for the first option. |
||
1302 | */ |
||
1303 | if (p == p0) { |
||
1304 | for (;;) { |
||
1305 | res = ccp_test(pcb, p, CILEN_BSD_COMPRESS, 1); |
||
1306 | if (res > 0) |
||
1307 | break; |
||
1308 | if (res < 0 || nb == BSD_MIN_BITS || dont_nak) { |
||
1309 | newret = CONFREJ; |
||
1310 | p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, |
||
1311 | ho->bsd_bits); |
||
1312 | break; |
||
1313 | } |
||
1314 | newret = CONFNAK; |
||
1315 | --nb; |
||
1316 | p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, nb); |
||
1317 | } |
||
1318 | } |
||
1319 | break; |
||
1320 | #endif /* BSDCOMPRESS_SUPPORT */ |
||
1321 | #if PREDICTOR_SUPPORT |
||
1322 | case CI_PREDICTOR_1: |
||
1323 | if (!ao->predictor_1 || clen != CILEN_PREDICTOR_1) { |
||
1324 | newret = CONFREJ; |
||
1325 | break; |
||
1326 | } |
||
1327 | |||
1328 | ho->predictor_1 = 1; |
||
1329 | if (p == p0 |
||
1330 | && ccp_test(pcb, p, CILEN_PREDICTOR_1, 1) <= 0) { |
||
1331 | newret = CONFREJ; |
||
1332 | } |
||
1333 | break; |
||
1334 | |||
1335 | case CI_PREDICTOR_2: |
||
1336 | if (!ao->predictor_2 || clen != CILEN_PREDICTOR_2) { |
||
1337 | newret = CONFREJ; |
||
1338 | break; |
||
1339 | } |
||
1340 | |||
1341 | ho->predictor_2 = 1; |
||
1342 | if (p == p0 |
||
1343 | && ccp_test(pcb, p, CILEN_PREDICTOR_2, 1) <= 0) { |
||
1344 | newret = CONFREJ; |
||
1345 | } |
||
1346 | break; |
||
1347 | #endif /* PREDICTOR_SUPPORT */ |
||
1348 | |||
1349 | default: |
||
1350 | newret = CONFREJ; |
||
1351 | } |
||
1352 | } |
||
1353 | |||
1354 | if (newret == CONFNAK && dont_nak) |
||
1355 | newret = CONFREJ; |
||
1356 | if (!(newret == CONFACK || (newret == CONFNAK && ret == CONFREJ))) { |
||
1357 | /* we're returning this option */ |
||
1358 | if (newret == CONFREJ && ret == CONFNAK) |
||
1359 | retp = p0; |
||
1360 | ret = newret; |
||
1361 | if (p != retp) |
||
1362 | MEMCPY(retp, p, clen); |
||
1363 | retp += clen; |
||
1364 | } |
||
1365 | |||
1366 | p += clen; |
||
1367 | len -= clen; |
||
1368 | } |
||
1369 | |||
1370 | if (ret != CONFACK) { |
||
1371 | if (ret == CONFREJ && *lenp == retp - p0) |
||
1372 | pcb->ccp_all_rejected = 1; |
||
1373 | else |
||
1374 | *lenp = retp - p0; |
||
1375 | } |
||
1376 | #if MPPE_SUPPORT |
||
1377 | if (ret == CONFREJ && ao->mppe && rej_for_ci_mppe) { |
||
1378 | ppp_error("MPPE required but peer negotiation failed"); |
||
1379 | lcp_close(pcb, "MPPE required but peer negotiation failed"); |
||
1380 | } |
||
1381 | #endif /* MPPE_SUPPORT */ |
||
1382 | return ret; |
||
1383 | } |
||
1384 | |||
1385 | /* |
||
1386 | * Make a string name for a compression method (or 2). |
||
1387 | */ |
||
1388 | static const char *method_name(ccp_options *opt, ccp_options *opt2) { |
||
1389 | static char result[64]; |
||
1390 | #if !DEFLATE_SUPPORT && !BSDCOMPRESS_SUPPORT |
||
1391 | LWIP_UNUSED_ARG(opt2); |
||
1392 | #endif /* !DEFLATE_SUPPORT && !BSDCOMPRESS_SUPPORT */ |
||
1393 | |||
1394 | if (!ccp_anycompress(opt)) |
||
1395 | return "(none)"; |
||
1396 | switch (opt->method) { |
||
1397 | #if MPPE_SUPPORT |
||
1398 | case CI_MPPE: |
||
1399 | { |
||
1400 | char *p = result; |
||
1401 | char *q = result + sizeof(result); /* 1 past result */ |
||
1402 | |||
1403 | ppp_slprintf(p, q - p, "MPPE "); |
||
1404 | p += 5; |
||
1405 | if (opt->mppe & MPPE_OPT_128) { |
||
1406 | ppp_slprintf(p, q - p, "128-bit "); |
||
1407 | p += 8; |
||
1408 | } |
||
1409 | if (opt->mppe & MPPE_OPT_40) { |
||
1410 | ppp_slprintf(p, q - p, "40-bit "); |
||
1411 | p += 7; |
||
1412 | } |
||
1413 | if (opt->mppe & MPPE_OPT_STATEFUL) |
||
1414 | ppp_slprintf(p, q - p, "stateful"); |
||
1415 | else |
||
1416 | ppp_slprintf(p, q - p, "stateless"); |
||
1417 | |||
1418 | break; |
||
1419 | } |
||
1420 | #endif /* MPPE_SUPPORT */ |
||
1421 | #if DEFLATE_SUPPORT |
||
1422 | case CI_DEFLATE: |
||
1423 | case CI_DEFLATE_DRAFT: |
||
1424 | if (opt2 != NULL && opt2->deflate_size != opt->deflate_size) |
||
1425 | ppp_slprintf(result, sizeof(result), "Deflate%s (%d/%d)", |
||
1426 | (opt->method == CI_DEFLATE_DRAFT? "(old#)": ""), |
||
1427 | opt->deflate_size, opt2->deflate_size); |
||
1428 | else |
||
1429 | ppp_slprintf(result, sizeof(result), "Deflate%s (%d)", |
||
1430 | (opt->method == CI_DEFLATE_DRAFT? "(old#)": ""), |
||
1431 | opt->deflate_size); |
||
1432 | break; |
||
1433 | #endif /* DEFLATE_SUPPORT */ |
||
1434 | #if BSDCOMPRESS_SUPPORT |
||
1435 | case CI_BSD_COMPRESS: |
||
1436 | if (opt2 != NULL && opt2->bsd_bits != opt->bsd_bits) |
||
1437 | ppp_slprintf(result, sizeof(result), "BSD-Compress (%d/%d)", |
||
1438 | opt->bsd_bits, opt2->bsd_bits); |
||
1439 | else |
||
1440 | ppp_slprintf(result, sizeof(result), "BSD-Compress (%d)", |
||
1441 | opt->bsd_bits); |
||
1442 | break; |
||
1443 | #endif /* BSDCOMPRESS_SUPPORT */ |
||
1444 | #if PREDICTOR_SUPPORT |
||
1445 | case CI_PREDICTOR_1: |
||
1446 | return "Predictor 1"; |
||
1447 | case CI_PREDICTOR_2: |
||
1448 | return "Predictor 2"; |
||
1449 | #endif /* PREDICTOR_SUPPORT */ |
||
1450 | default: |
||
1451 | ppp_slprintf(result, sizeof(result), "Method %d", opt->method); |
||
1452 | } |
||
1453 | return result; |
||
1454 | } |
||
1455 | |||
1456 | /* |
||
1457 | * CCP has come up - inform the kernel driver and log a message. |
||
1458 | */ |
||
1459 | static void ccp_up(fsm *f) { |
||
1460 | ppp_pcb *pcb = f->pcb; |
||
1461 | ccp_options *go = &pcb->ccp_gotoptions; |
||
1462 | ccp_options *ho = &pcb->ccp_hisoptions; |
||
1463 | char method1[64]; |
||
1464 | |||
1465 | ccp_set(pcb, 1, 1, go->method, ho->method); |
||
1466 | if (ccp_anycompress(go)) { |
||
1467 | if (ccp_anycompress(ho)) { |
||
1468 | if (go->method == ho->method) { |
||
1469 | ppp_notice("%s compression enabled", method_name(go, ho)); |
||
1470 | } else { |
||
1471 | ppp_strlcpy(method1, method_name(go, NULL), sizeof(method1)); |
||
1472 | ppp_notice("%s / %s compression enabled", |
||
1473 | method1, method_name(ho, NULL)); |
||
1474 | } |
||
1475 | } else |
||
1476 | ppp_notice("%s receive compression enabled", method_name(go, NULL)); |
||
1477 | } else if (ccp_anycompress(ho)) |
||
1478 | ppp_notice("%s transmit compression enabled", method_name(ho, NULL)); |
||
1479 | #if MPPE_SUPPORT |
||
1480 | if (go->mppe) { |
||
1481 | continue_networks(pcb); /* Bring up IP et al */ |
||
1482 | } |
||
1483 | #endif /* MPPE_SUPPORT */ |
||
1484 | } |
||
1485 | |||
1486 | /* |
||
1487 | * CCP has gone down - inform the kernel driver. |
||
1488 | */ |
||
1489 | static void ccp_down(fsm *f) { |
||
1490 | ppp_pcb *pcb = f->pcb; |
||
1491 | #if MPPE_SUPPORT |
||
1492 | ccp_options *go = &pcb->ccp_gotoptions; |
||
1493 | #endif /* MPPE_SUPPORT */ |
||
1494 | |||
1495 | if (pcb->ccp_localstate & RACK_PENDING) |
||
1496 | UNTIMEOUT(ccp_rack_timeout, f); |
||
1497 | pcb->ccp_localstate = 0; |
||
1498 | ccp_set(pcb, 1, 0, 0, 0); |
||
1499 | #if MPPE_SUPPORT |
||
1500 | if (go->mppe) { |
||
1501 | go->mppe = 0; |
||
1502 | if (pcb->lcp_fsm.state == PPP_FSM_OPENED) { |
||
1503 | /* If LCP is not already going down, make sure it does. */ |
||
1504 | ppp_error("MPPE disabled"); |
||
1505 | lcp_close(pcb, "MPPE disabled"); |
||
1506 | } |
||
1507 | } |
||
1508 | #endif /* MPPE_SUPPORT */ |
||
1509 | } |
||
1510 | |||
1511 | #if PRINTPKT_SUPPORT |
||
1512 | /* |
||
1513 | * Print the contents of a CCP packet. |
||
1514 | */ |
||
1515 | static const char* const ccp_codenames[] = { |
||
1516 | "ConfReq", "ConfAck", "ConfNak", "ConfRej", |
||
1517 | "TermReq", "TermAck", "CodeRej", |
||
1518 | NULL, NULL, NULL, NULL, NULL, NULL, |
||
1519 | "ResetReq", "ResetAck", |
||
1520 | }; |
||
1521 | |||
1522 | static int ccp_printpkt(const u_char *p, int plen, void (*printer) (void *, const char *, ...), void *arg) { |
||
1523 | const u_char *p0, *optend; |
||
1524 | int code, id, len; |
||
1525 | int optlen; |
||
1526 | |||
1527 | p0 = p; |
||
1528 | if (plen < HEADERLEN) |
||
1529 | return 0; |
||
1530 | code = p[0]; |
||
1531 | id = p[1]; |
||
1532 | len = (p[2] << 8) + p[3]; |
||
1533 | if (len < HEADERLEN || len > plen) |
||
1534 | return 0; |
||
1535 | |||
1536 | if (code >= 1 && code <= (int)LWIP_ARRAYSIZE(ccp_codenames) && ccp_codenames[code-1] != NULL) |
||
1537 | printer(arg, " %s", ccp_codenames[code-1]); |
||
1538 | else |
||
1539 | printer(arg, " code=0x%x", code); |
||
1540 | printer(arg, " id=0x%x", id); |
||
1541 | len -= HEADERLEN; |
||
1542 | p += HEADERLEN; |
||
1543 | |||
1544 | switch (code) { |
||
1545 | case CONFREQ: |
||
1546 | case CONFACK: |
||
1547 | case CONFNAK: |
||
1548 | case CONFREJ: |
||
1549 | /* print list of possible compression methods */ |
||
1550 | while (len >= 2) { |
||
1551 | code = p[0]; |
||
1552 | optlen = p[1]; |
||
1553 | if (optlen < 2 || optlen > len) |
||
1554 | break; |
||
1555 | printer(arg, " <"); |
||
1556 | len -= optlen; |
||
1557 | optend = p + optlen; |
||
1558 | switch (code) { |
||
1559 | #if MPPE_SUPPORT |
||
1560 | case CI_MPPE: |
||
1561 | if (optlen >= CILEN_MPPE) { |
||
1562 | u_char mppe_opts; |
||
1563 | |||
1564 | MPPE_CI_TO_OPTS(&p[2], mppe_opts); |
||
1565 | printer(arg, "mppe %s %s %s %s %s %s%s", |
||
1566 | (p[2] & MPPE_H_BIT)? "+H": "-H", |
||
1567 | (p[5] & MPPE_M_BIT)? "+M": "-M", |
||
1568 | (p[5] & MPPE_S_BIT)? "+S": "-S", |
||
1569 | (p[5] & MPPE_L_BIT)? "+L": "-L", |
||
1570 | (p[5] & MPPE_D_BIT)? "+D": "-D", |
||
1571 | (p[5] & MPPE_C_BIT)? "+C": "-C", |
||
1572 | (mppe_opts & MPPE_OPT_UNKNOWN)? " +U": ""); |
||
1573 | if (mppe_opts & MPPE_OPT_UNKNOWN) |
||
1574 | printer(arg, " (%.2x %.2x %.2x %.2x)", |
||
1575 | p[2], p[3], p[4], p[5]); |
||
1576 | p += CILEN_MPPE; |
||
1577 | } |
||
1578 | break; |
||
1579 | #endif /* MPPE_SUPPORT */ |
||
1580 | #if DEFLATE_SUPPORT |
||
1581 | case CI_DEFLATE: |
||
1582 | case CI_DEFLATE_DRAFT: |
||
1583 | if (optlen >= CILEN_DEFLATE) { |
||
1584 | printer(arg, "deflate%s %d", |
||
1585 | (code == CI_DEFLATE_DRAFT? "(old#)": ""), |
||
1586 | DEFLATE_SIZE(p[2])); |
||
1587 | if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL) |
||
1588 | printer(arg, " method %d", DEFLATE_METHOD(p[2])); |
||
1589 | if (p[3] != DEFLATE_CHK_SEQUENCE) |
||
1590 | printer(arg, " check %d", p[3]); |
||
1591 | p += CILEN_DEFLATE; |
||
1592 | } |
||
1593 | break; |
||
1594 | #endif /* DEFLATE_SUPPORT */ |
||
1595 | #if BSDCOMPRESS_SUPPORT |
||
1596 | case CI_BSD_COMPRESS: |
||
1597 | if (optlen >= CILEN_BSD_COMPRESS) { |
||
1598 | printer(arg, "bsd v%d %d", BSD_VERSION(p[2]), |
||
1599 | BSD_NBITS(p[2])); |
||
1600 | p += CILEN_BSD_COMPRESS; |
||
1601 | } |
||
1602 | break; |
||
1603 | #endif /* BSDCOMPRESS_SUPPORT */ |
||
1604 | #if PREDICTOR_SUPPORT |
||
1605 | case CI_PREDICTOR_1: |
||
1606 | if (optlen >= CILEN_PREDICTOR_1) { |
||
1607 | printer(arg, "predictor 1"); |
||
1608 | p += CILEN_PREDICTOR_1; |
||
1609 | } |
||
1610 | break; |
||
1611 | case CI_PREDICTOR_2: |
||
1612 | if (optlen >= CILEN_PREDICTOR_2) { |
||
1613 | printer(arg, "predictor 2"); |
||
1614 | p += CILEN_PREDICTOR_2; |
||
1615 | } |
||
1616 | break; |
||
1617 | #endif /* PREDICTOR_SUPPORT */ |
||
1618 | default: |
||
1619 | break; |
||
1620 | } |
||
1621 | while (p < optend) |
||
1622 | printer(arg, " %.2x", *p++); |
||
1623 | printer(arg, ">"); |
||
1624 | } |
||
1625 | break; |
||
1626 | |||
1627 | case TERMACK: |
||
1628 | case TERMREQ: |
||
1629 | if (len > 0 && *p >= ' ' && *p < 0x7f) { |
||
1630 | ppp_print_string(p, len, printer, arg); |
||
1631 | p += len; |
||
1632 | len = 0; |
||
1633 | } |
||
1634 | break; |
||
1635 | default: |
||
1636 | break; |
||
1637 | } |
||
1638 | |||
1639 | /* dump out the rest of the packet in hex */ |
||
1640 | while (--len >= 0) |
||
1641 | printer(arg, " %.2x", *p++); |
||
1642 | |||
1643 | return p - p0; |
||
1644 | } |
||
1645 | #endif /* PRINTPKT_SUPPORT */ |
||
1646 | |||
1647 | #if PPP_DATAINPUT |
||
1648 | /* |
||
1649 | * We have received a packet that the decompressor failed to |
||
1650 | * decompress. Here we would expect to issue a reset-request, but |
||
1651 | * Motorola has a patent on resetting the compressor as a result of |
||
1652 | * detecting an error in the decompressed data after decompression. |
||
1653 | * (See US patent 5,130,993; international patent publication number |
||
1654 | * WO 91/10289; Australian patent 73296/91.) |
||
1655 | * |
||
1656 | * So we ask the kernel whether the error was detected after |
||
1657 | * decompression; if it was, we take CCP down, thus disabling |
||
1658 | * compression :-(, otherwise we issue the reset-request. |
||
1659 | */ |
||
1660 | static void ccp_datainput(ppp_pcb *pcb, u_char *pkt, int len) { |
||
1661 | fsm *f; |
||
1662 | #if MPPE_SUPPORT |
||
1663 | ccp_options *go = &pcb->ccp_gotoptions; |
||
1664 | #endif /* MPPE_SUPPORT */ |
||
1665 | LWIP_UNUSED_ARG(pkt); |
||
1666 | LWIP_UNUSED_ARG(len); |
||
1667 | |||
1668 | f = &pcb->ccp_fsm; |
||
1669 | if (f->state == PPP_FSM_OPENED) { |
||
1670 | if (ccp_fatal_error(pcb)) { |
||
1671 | /* |
||
1672 | * Disable compression by taking CCP down. |
||
1673 | */ |
||
1674 | ppp_error("Lost compression sync: disabling compression"); |
||
1675 | ccp_close(pcb, "Lost compression sync"); |
||
1676 | #if MPPE_SUPPORT |
||
1677 | /* |
||
1678 | * If we were doing MPPE, we must also take the link down. |
||
1679 | */ |
||
1680 | if (go->mppe) { |
||
1681 | ppp_error("Too many MPPE errors, closing LCP"); |
||
1682 | lcp_close(pcb, "Too many MPPE errors"); |
||
1683 | } |
||
1684 | #endif /* MPPE_SUPPORT */ |
||
1685 | } else { |
||
1686 | /* |
||
1687 | * Send a reset-request to reset the peer's compressor. |
||
1688 | * We don't do that if we are still waiting for an |
||
1689 | * acknowledgement to a previous reset-request. |
||
1690 | */ |
||
1691 | if (!(pcb->ccp_localstate & RACK_PENDING)) { |
||
1692 | fsm_sdata(f, CCP_RESETREQ, f->reqid = ++f->id, NULL, 0); |
||
1693 | TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT); |
||
1694 | pcb->ccp_localstate |= RACK_PENDING; |
||
1695 | } else |
||
1696 | pcb->ccp_localstate |= RREQ_REPEAT; |
||
1697 | } |
||
1698 | } |
||
1699 | } |
||
1700 | #endif /* PPP_DATAINPUT */ |
||
1701 | |||
1702 | /* |
||
1703 | * We have received a packet that the decompressor failed to |
||
1704 | * decompress. Issue a reset-request. |
||
1705 | */ |
||
1706 | void ccp_resetrequest(ppp_pcb *pcb) { |
||
1707 | fsm *f = &pcb->ccp_fsm; |
||
1708 | |||
1709 | if (f->state != PPP_FSM_OPENED) |
||
1710 | return; |
||
1711 | |||
1712 | /* |
||
1713 | * Send a reset-request to reset the peer's compressor. |
||
1714 | * We don't do that if we are still waiting for an |
||
1715 | * acknowledgement to a previous reset-request. |
||
1716 | */ |
||
1717 | if (!(pcb->ccp_localstate & RACK_PENDING)) { |
||
1718 | fsm_sdata(f, CCP_RESETREQ, f->reqid = ++f->id, NULL, 0); |
||
1719 | TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT); |
||
1720 | pcb->ccp_localstate |= RACK_PENDING; |
||
1721 | } else |
||
1722 | pcb->ccp_localstate |= RREQ_REPEAT; |
||
1723 | } |
||
1724 | |||
1725 | /* |
||
1726 | * Timeout waiting for reset-ack. |
||
1727 | */ |
||
1728 | static void ccp_rack_timeout(void *arg) { |
||
1729 | fsm *f = (fsm*)arg; |
||
1730 | ppp_pcb *pcb = f->pcb; |
||
1731 | |||
1732 | if (f->state == PPP_FSM_OPENED && (pcb->ccp_localstate & RREQ_REPEAT)) { |
||
1733 | fsm_sdata(f, CCP_RESETREQ, f->reqid, NULL, 0); |
||
1734 | TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT); |
||
1735 | pcb->ccp_localstate &= ~RREQ_REPEAT; |
||
1736 | } else |
||
1737 | pcb->ccp_localstate &= ~RACK_PENDING; |
||
1738 | } |
||
1739 | |||
1740 | #endif /* PPP_SUPPORT && CCP_SUPPORT */ |