1 | /* |
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2 | * ipxcp.c - PPP IPX Control Protocol. |
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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 | #ifdef IPX_CHANGE |
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21 | |
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22 | #define RCSID "$Id$" |
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23 | |
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24 | /* |
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25 | * TODO: |
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26 | */ |
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27 | |
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28 | #include <stdio.h> |
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29 | #include <string.h> |
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30 | #include <unistd.h> |
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31 | #include <ctype.h> |
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32 | #include <sys/types.h> |
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33 | #include <sys/socket.h> |
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34 | #include <netinet/in.h> |
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35 | |
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36 | #include "pppd.h" |
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37 | #include "fsm.h" |
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38 | #include "ipxcp.h" |
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39 | #include "pathnames.h" |
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40 | #include "magic.h" |
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41 | |
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42 | static const char rcsid[] = RCSID; |
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43 | |
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44 | /* global vars */ |
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45 | ipxcp_options ipxcp_wantoptions[NUM_PPP]; /* Options that we want to request */ |
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46 | ipxcp_options ipxcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */ |
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47 | ipxcp_options ipxcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */ |
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48 | ipxcp_options ipxcp_hisoptions[NUM_PPP]; /* Options that we ack'd */ |
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49 | |
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50 | #define wo (&ipxcp_wantoptions[0]) |
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51 | #define ao (&ipxcp_allowoptions[0]) |
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52 | #define go (&ipxcp_gotoptions[0]) |
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53 | #define ho (&ipxcp_hisoptions[0]) |
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54 | |
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55 | /* |
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56 | * Callbacks for fsm code. (CI = Configuration Information) |
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57 | */ |
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58 | static void ipxcp_resetci __P((fsm *)); /* Reset our CI */ |
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59 | static int ipxcp_cilen __P((fsm *)); /* Return length of our CI */ |
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60 | static void ipxcp_addci __P((fsm *, u_char *, int *)); /* Add our CI */ |
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61 | static int ipxcp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */ |
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62 | static int ipxcp_nakci __P((fsm *, u_char *, int)); /* Peer nak'd our CI */ |
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63 | static int ipxcp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */ |
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64 | static int ipxcp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv CI */ |
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65 | static void ipxcp_up __P((fsm *)); /* We're UP */ |
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66 | static void ipxcp_down __P((fsm *)); /* We're DOWN */ |
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67 | static void ipxcp_finished __P((fsm *)); /* Don't need lower layer */ |
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68 | |
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69 | fsm ipxcp_fsm[NUM_PPP]; /* IPXCP fsm structure */ |
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70 | |
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71 | static fsm_callbacks ipxcp_callbacks = { /* IPXCP callback routines */ |
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72 | ipxcp_resetci, /* Reset our Configuration Information */ |
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73 | ipxcp_cilen, /* Length of our Configuration Information */ |
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74 | ipxcp_addci, /* Add our Configuration Information */ |
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75 | ipxcp_ackci, /* ACK our Configuration Information */ |
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76 | ipxcp_nakci, /* NAK our Configuration Information */ |
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77 | ipxcp_rejci, /* Reject our Configuration Information */ |
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78 | ipxcp_reqci, /* Request peer's Configuration Information */ |
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79 | ipxcp_up, /* Called when fsm reaches OPENED state */ |
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80 | ipxcp_down, /* Called when fsm leaves OPENED state */ |
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81 | NULL, /* Called when we want the lower layer up */ |
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82 | ipxcp_finished, /* Called when we want the lower layer down */ |
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83 | NULL, /* Called when Protocol-Reject received */ |
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84 | NULL, /* Retransmission is necessary */ |
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85 | NULL, /* Called to handle protocol-specific codes */ |
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86 | "IPXCP" /* String name of protocol */ |
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87 | }; |
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88 | |
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89 | /* |
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90 | * Command-line options. |
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91 | */ |
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92 | static int setipxnode __P((char **)); |
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93 | static int setipxname __P((char **)); |
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94 | |
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95 | static option_t ipxcp_option_list[] = { |
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96 | { "ipx", o_bool, &ipxcp_protent.enabled_flag, |
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97 | "Enable IPXCP (and IPX)", 1 }, |
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98 | { "+ipx", o_bool, &ipxcp_protent.enabled_flag, |
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99 | "Enable IPXCP (and IPX)", 1 }, |
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100 | { "noipx", o_bool, &ipxcp_protent.enabled_flag, |
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101 | "Disable IPXCP (and IPX)" }, |
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102 | { "-ipx", o_bool, &ipxcp_protent.enabled_flag, |
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103 | "Disable IPXCP (and IPX)" } , |
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104 | { "ipx-network", o_uint32, &ipxcp_wantoptions[0].our_network, |
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105 | "Set our IPX network number", 0, &ipxcp_wantoptions[0].neg_nn }, |
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106 | { "ipxcp-accept-network", o_bool, &ipxcp_wantoptions[0].accept_network, |
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107 | "Accept peer IPX network number", 1, |
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108 | &ipxcp_allowoptions[0].accept_network }, |
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109 | { "ipx-node", o_special, setipxnode, |
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110 | "Set IPX node number" }, |
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111 | { "ipxcp-accept-local", o_bool, &ipxcp_wantoptions[0].accept_local, |
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112 | "Accept our IPX address", 1, |
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113 | &ipxcp_allowoptions[0].accept_local }, |
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114 | { "ipxcp-accept-remote", o_bool, &ipxcp_wantoptions[0].accept_remote, |
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115 | "Accept peer's IPX address", 1, |
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116 | &ipxcp_allowoptions[0].accept_remote }, |
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117 | { "ipx-routing", o_int, &ipxcp_wantoptions[0].router, |
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118 | "Set IPX routing proto number", 0, |
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119 | &ipxcp_wantoptions[0].neg_router }, |
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120 | { "ipx-router-name", o_special, setipxname, |
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121 | "Set IPX router name" }, |
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122 | { "ipxcp-restart", o_int, &ipxcp_fsm[0].timeouttime, |
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123 | "Set timeout for IPXCP" }, |
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124 | { "ipxcp-max-terminate", o_int, &ipxcp_fsm[0].maxtermtransmits, |
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125 | "Set max #xmits for IPXCP term-reqs" }, |
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126 | { "ipxcp-max-configure", o_int, &ipxcp_fsm[0].maxconfreqtransmits, |
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127 | "Set max #xmits for IPXCP conf-reqs" }, |
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128 | { "ipxcp-max-failure", o_int, &ipxcp_fsm[0].maxnakloops, |
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129 | "Set max #conf-naks for IPXCP" }, |
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130 | { NULL } |
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131 | }; |
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132 | |
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133 | /* |
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134 | * Protocol entry points. |
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135 | */ |
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136 | |
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137 | static void ipxcp_init __P((int)); |
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138 | static void ipxcp_open __P((int)); |
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139 | static void ipxcp_close __P((int, char *)); |
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140 | static void ipxcp_lowerup __P((int)); |
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141 | static void ipxcp_lowerdown __P((int)); |
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142 | static void ipxcp_input __P((int, u_char *, int)); |
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143 | static void ipxcp_protrej __P((int)); |
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144 | static int ipxcp_printpkt __P((u_char *, int, |
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145 | void (*) __P((void *, char *, ...)), void *)); |
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146 | |
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147 | struct protent ipxcp_protent = { |
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148 | PPP_IPXCP, |
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149 | ipxcp_init, |
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150 | ipxcp_input, |
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151 | ipxcp_protrej, |
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152 | ipxcp_lowerup, |
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153 | ipxcp_lowerdown, |
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154 | ipxcp_open, |
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155 | ipxcp_close, |
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156 | ipxcp_printpkt, |
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157 | NULL, |
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158 | 0, |
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159 | "IPXCP", |
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160 | "IPX", |
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161 | ipxcp_option_list, |
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162 | NULL, |
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163 | NULL, |
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164 | NULL |
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165 | }; |
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166 | |
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167 | /* |
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168 | * Lengths of configuration options. |
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169 | */ |
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170 | |
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171 | #define CILEN_VOID 2 |
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172 | #define CILEN_COMPLETE 2 /* length of complete option */ |
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173 | #define CILEN_NETN 6 /* network number length option */ |
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174 | #define CILEN_NODEN 8 /* node number length option */ |
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175 | #define CILEN_PROTOCOL 4 /* Minimum length of routing protocol */ |
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176 | #define CILEN_NAME 3 /* Minimum length of router name */ |
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177 | #define CILEN_COMPRESS 4 /* Minimum length of compression protocol */ |
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178 | |
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179 | #define CODENAME(x) ((x) == CONFACK ? "ACK" : \ |
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180 | (x) == CONFNAK ? "NAK" : "REJ") |
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181 | |
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182 | static int ipxcp_is_up; |
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183 | |
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184 | static char *ipx_ntoa __P((u_int32_t)); |
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185 | |
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186 | /* Used in printing the node number */ |
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187 | #define NODE(base) base[0], base[1], base[2], base[3], base[4], base[5] |
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188 | |
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189 | /* Used to generate the proper bit mask */ |
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190 | #define BIT(num) (1 << (num)) |
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191 | |
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192 | /* |
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193 | * Convert from internal to external notation |
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194 | */ |
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195 | |
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196 | static short int |
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197 | to_external(internal) |
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198 | short int internal; |
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199 | { |
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200 | short int external; |
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201 | |
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202 | if (internal & BIT(IPX_NONE) ) |
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203 | external = IPX_NONE; |
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204 | else |
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205 | external = RIP_SAP; |
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206 | |
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207 | return external; |
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208 | } |
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209 | |
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210 | /* |
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211 | * Make a string representation of a network IP address. |
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212 | */ |
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213 | |
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214 | static char * |
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215 | ipx_ntoa(ipxaddr) |
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216 | u_int32_t ipxaddr; |
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217 | { |
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218 | static char b[64]; |
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219 | slprintf(b, sizeof(b), "%x", ipxaddr); |
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220 | return b; |
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221 | } |
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222 | |
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223 | |
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224 | static u_char * |
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225 | setipxnodevalue(src,dst) |
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226 | u_char *src, *dst; |
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227 | { |
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228 | int indx; |
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229 | int item; |
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230 | |
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231 | for (;;) { |
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232 | if (!isxdigit (*src)) |
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233 | break; |
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234 | |
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235 | for (indx = 0; indx < 5; ++indx) { |
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236 | dst[indx] <<= 4; |
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237 | dst[indx] |= (dst[indx + 1] >> 4) & 0x0F; |
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238 | } |
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239 | |
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240 | item = toupper (*src) - '0'; |
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241 | if (item > 9) |
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242 | item -= 7; |
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243 | |
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244 | dst[5] = (dst[5] << 4) | item; |
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245 | ++src; |
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246 | } |
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247 | return src; |
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248 | } |
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249 | |
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250 | static int |
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251 | setipxnode(argv) |
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252 | char **argv; |
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253 | { |
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254 | char *end; |
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255 | |
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256 | memset (&ipxcp_wantoptions[0].our_node[0], 0, 6); |
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257 | memset (&ipxcp_wantoptions[0].his_node[0], 0, 6); |
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258 | |
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259 | end = setipxnodevalue (*argv, &ipxcp_wantoptions[0].our_node[0]); |
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260 | if (*end == ':') |
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261 | end = setipxnodevalue (++end, &ipxcp_wantoptions[0].his_node[0]); |
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262 | |
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263 | if (*end == '\0') { |
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264 | ipxcp_wantoptions[0].neg_node = 1; |
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265 | return 1; |
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266 | } |
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267 | |
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268 | option_error("invalid parameter '%s' for ipx-node option", *argv); |
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269 | return 0; |
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270 | } |
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271 | |
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272 | static int |
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273 | setipxname (argv) |
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274 | char **argv; |
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275 | { |
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276 | char *dest = ipxcp_wantoptions[0].name; |
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277 | char *src = *argv; |
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278 | int count; |
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279 | char ch; |
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280 | |
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281 | ipxcp_wantoptions[0].neg_name = 1; |
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282 | ipxcp_allowoptions[0].neg_name = 1; |
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283 | memset (dest, '\0', sizeof (ipxcp_wantoptions[0].name)); |
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284 | |
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285 | count = 0; |
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286 | while (*src) { |
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287 | ch = *src++; |
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288 | if (! isalnum (ch) && ch != '_') { |
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289 | option_error("IPX router name must be alphanumeric or _"); |
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290 | return 0; |
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291 | } |
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292 | |
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293 | if (count >= sizeof (ipxcp_wantoptions[0].name)) { |
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294 | option_error("IPX router name is limited to %d characters", |
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295 | sizeof (ipxcp_wantoptions[0].name) - 1); |
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296 | return 0; |
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297 | } |
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298 | |
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299 | dest[count++] = toupper (ch); |
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300 | } |
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301 | |
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302 | return 1; |
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303 | } |
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304 | |
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305 | /* |
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306 | * ipxcp_init - Initialize IPXCP. |
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307 | */ |
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308 | static void |
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309 | ipxcp_init(unit) |
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310 | int unit; |
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311 | { |
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312 | fsm *f = &ipxcp_fsm[unit]; |
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313 | |
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314 | f->unit = unit; |
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315 | f->protocol = PPP_IPXCP; |
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316 | f->callbacks = &ipxcp_callbacks; |
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317 | fsm_init(&ipxcp_fsm[unit]); |
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318 | |
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319 | memset (wo->name, 0, sizeof (wo->name)); |
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320 | memset (wo->our_node, 0, sizeof (wo->our_node)); |
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321 | memset (wo->his_node, 0, sizeof (wo->his_node)); |
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322 | |
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323 | wo->neg_nn = 1; |
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324 | wo->neg_complete = 1; |
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325 | wo->network = 0; |
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326 | |
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327 | ao->neg_node = 1; |
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328 | ao->neg_nn = 1; |
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329 | ao->neg_name = 1; |
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330 | ao->neg_complete = 1; |
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331 | ao->neg_router = 1; |
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332 | |
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333 | ao->accept_local = 0; |
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334 | ao->accept_remote = 0; |
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335 | ao->accept_network = 0; |
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336 | |
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337 | wo->tried_rip = 0; |
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338 | wo->tried_nlsp = 0; |
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339 | } |
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340 | |
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341 | /* |
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342 | * Copy the node number |
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343 | */ |
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344 | |
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345 | static void |
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346 | copy_node (src, dst) |
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347 | u_char *src, *dst; |
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348 | { |
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349 | memcpy (dst, src, sizeof (ipxcp_wantoptions[0].our_node)); |
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350 | } |
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351 | |
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352 | /* |
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353 | * Compare node numbers |
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354 | */ |
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355 | |
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356 | static int |
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357 | compare_node (src, dst) |
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358 | u_char *src, *dst; |
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359 | { |
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360 | return memcmp (dst, src, sizeof (ipxcp_wantoptions[0].our_node)) == 0; |
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361 | } |
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362 | |
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363 | /* |
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364 | * Is the node number zero? |
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365 | */ |
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366 | |
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367 | static int |
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368 | zero_node (node) |
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369 | u_char *node; |
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370 | { |
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371 | int indx; |
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372 | for (indx = 0; indx < sizeof (ipxcp_wantoptions[0].our_node); ++indx) |
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373 | if (node [indx] != 0) |
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374 | return 0; |
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375 | return 1; |
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376 | } |
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377 | |
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378 | /* |
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379 | * Increment the node number |
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380 | */ |
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381 | |
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382 | static void |
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383 | inc_node (node) |
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384 | u_char *node; |
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385 | { |
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386 | u_char *outp; |
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387 | u_int32_t magic_num; |
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388 | |
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389 | outp = node; |
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390 | magic_num = magic(); |
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391 | *outp++ = '\0'; |
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392 | *outp++ = '\0'; |
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393 | PUTLONG (magic_num, outp); |
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394 | } |
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395 | |
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396 | /* |
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397 | * ipxcp_open - IPXCP is allowed to come up. |
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398 | */ |
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399 | static void |
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400 | ipxcp_open(unit) |
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401 | int unit; |
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402 | { |
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403 | fsm_open(&ipxcp_fsm[unit]); |
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404 | } |
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405 | |
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406 | /* |
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407 | * ipxcp_close - Take IPXCP down. |
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408 | */ |
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409 | static void |
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410 | ipxcp_close(unit, reason) |
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411 | int unit; |
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412 | char *reason; |
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413 | { |
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414 | fsm_close(&ipxcp_fsm[unit], reason); |
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415 | } |
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416 | |
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417 | |
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418 | /* |
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419 | * ipxcp_lowerup - The lower layer is up. |
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420 | */ |
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421 | static void |
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422 | ipxcp_lowerup(unit) |
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423 | int unit; |
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424 | { |
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425 | fsm_lowerup(&ipxcp_fsm[unit]); |
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426 | } |
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427 | |
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428 | |
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429 | /* |
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430 | * ipxcp_lowerdown - The lower layer is down. |
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431 | */ |
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432 | static void |
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433 | ipxcp_lowerdown(unit) |
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434 | int unit; |
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435 | { |
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436 | fsm_lowerdown(&ipxcp_fsm[unit]); |
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437 | } |
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438 | |
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439 | |
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440 | /* |
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441 | * ipxcp_input - Input IPXCP packet. |
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442 | */ |
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443 | static void |
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444 | ipxcp_input(unit, p, len) |
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445 | int unit; |
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446 | u_char *p; |
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447 | int len; |
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448 | { |
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449 | fsm_input(&ipxcp_fsm[unit], p, len); |
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450 | } |
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451 | |
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452 | |
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453 | /* |
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454 | * ipxcp_protrej - A Protocol-Reject was received for IPXCP. |
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455 | * |
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456 | * Pretend the lower layer went down, so we shut up. |
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457 | */ |
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458 | static void |
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459 | ipxcp_protrej(unit) |
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460 | int unit; |
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461 | { |
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462 | fsm_lowerdown(&ipxcp_fsm[unit]); |
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463 | } |
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464 | |
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465 | |
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466 | /* |
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467 | * ipxcp_resetci - Reset our CI. |
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468 | */ |
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469 | static void |
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470 | ipxcp_resetci(f) |
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471 | fsm *f; |
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472 | { |
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473 | wo->req_node = wo->neg_node && ao->neg_node; |
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474 | wo->req_nn = wo->neg_nn && ao->neg_nn; |
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475 | |
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476 | if (wo->our_network == 0) { |
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477 | wo->neg_node = 1; |
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478 | ao->accept_network = 1; |
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479 | } |
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480 | /* |
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481 | * If our node number is zero then change it. |
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482 | */ |
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483 | if (zero_node (wo->our_node)) { |
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484 | inc_node (wo->our_node); |
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485 | ao->accept_local = 1; |
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486 | wo->neg_node = 1; |
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487 | } |
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488 | /* |
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489 | * If his node number is zero then change it. |
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490 | */ |
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491 | if (zero_node (wo->his_node)) { |
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492 | inc_node (wo->his_node); |
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493 | ao->accept_remote = 1; |
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494 | } |
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495 | /* |
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496 | * If no routing agent was specified then we do RIP/SAP according to the |
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497 | * RFC documents. If you have specified something then OK. Otherwise, we |
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498 | * do RIP/SAP. |
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499 | */ |
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500 | if (ao->router == 0) { |
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501 | ao->router |= BIT(RIP_SAP); |
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502 | wo->router |= BIT(RIP_SAP); |
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503 | } |
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504 | |
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505 | /* Always specify a routing protocol unless it was REJected. */ |
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506 | wo->neg_router = 1; |
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507 | /* |
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508 | * Start with these default values |
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509 | */ |
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510 | *go = *wo; |
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511 | } |
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512 | |
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513 | /* |
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514 | * ipxcp_cilen - Return length of our CI. |
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515 | */ |
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516 | |
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517 | static int |
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518 | ipxcp_cilen(f) |
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519 | fsm *f; |
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520 | { |
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521 | int len; |
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522 | |
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523 | len = go->neg_nn ? CILEN_NETN : 0; |
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524 | len += go->neg_node ? CILEN_NODEN : 0; |
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525 | len += go->neg_name ? CILEN_NAME + strlen (go->name) - 1 : 0; |
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526 | |
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527 | /* RFC says that defaults should not be included. */ |
---|
528 | if (go->neg_router && to_external(go->router) != RIP_SAP) |
---|
529 | len += CILEN_PROTOCOL; |
---|
530 | |
---|
531 | return (len); |
---|
532 | } |
---|
533 | |
---|
534 | |
---|
535 | /* |
---|
536 | * ipxcp_addci - Add our desired CIs to a packet. |
---|
537 | */ |
---|
538 | static void |
---|
539 | ipxcp_addci(f, ucp, lenp) |
---|
540 | fsm *f; |
---|
541 | u_char *ucp; |
---|
542 | int *lenp; |
---|
543 | { |
---|
544 | /* |
---|
545 | * Add the options to the record. |
---|
546 | */ |
---|
547 | if (go->neg_nn) { |
---|
548 | PUTCHAR (IPX_NETWORK_NUMBER, ucp); |
---|
549 | PUTCHAR (CILEN_NETN, ucp); |
---|
550 | PUTLONG (go->our_network, ucp); |
---|
551 | } |
---|
552 | |
---|
553 | if (go->neg_node) { |
---|
554 | int indx; |
---|
555 | PUTCHAR (IPX_NODE_NUMBER, ucp); |
---|
556 | PUTCHAR (CILEN_NODEN, ucp); |
---|
557 | for (indx = 0; indx < sizeof (go->our_node); ++indx) |
---|
558 | PUTCHAR (go->our_node[indx], ucp); |
---|
559 | } |
---|
560 | |
---|
561 | if (go->neg_name) { |
---|
562 | int cilen = strlen (go->name); |
---|
563 | int indx; |
---|
564 | PUTCHAR (IPX_ROUTER_NAME, ucp); |
---|
565 | PUTCHAR (CILEN_NAME + cilen - 1, ucp); |
---|
566 | for (indx = 0; indx < cilen; ++indx) |
---|
567 | PUTCHAR (go->name [indx], ucp); |
---|
568 | } |
---|
569 | |
---|
570 | if (go->neg_router) { |
---|
571 | short external = to_external (go->router); |
---|
572 | if (external != RIP_SAP) { |
---|
573 | PUTCHAR (IPX_ROUTER_PROTOCOL, ucp); |
---|
574 | PUTCHAR (CILEN_PROTOCOL, ucp); |
---|
575 | PUTSHORT (external, ucp); |
---|
576 | } |
---|
577 | } |
---|
578 | } |
---|
579 | |
---|
580 | /* |
---|
581 | * ipxcp_ackci - Ack our CIs. |
---|
582 | * |
---|
583 | * Returns: |
---|
584 | * 0 - Ack was bad. |
---|
585 | * 1 - Ack was good. |
---|
586 | */ |
---|
587 | static int |
---|
588 | ipxcp_ackci(f, p, len) |
---|
589 | fsm *f; |
---|
590 | u_char *p; |
---|
591 | int len; |
---|
592 | { |
---|
593 | u_short cilen, citype, cishort; |
---|
594 | u_char cichar; |
---|
595 | u_int32_t cilong; |
---|
596 | |
---|
597 | #define ACKCIVOID(opt, neg) \ |
---|
598 | if (neg) { \ |
---|
599 | if ((len -= CILEN_VOID) < 0) \ |
---|
600 | break; \ |
---|
601 | GETCHAR(citype, p); \ |
---|
602 | GETCHAR(cilen, p); \ |
---|
603 | if (cilen != CILEN_VOID || \ |
---|
604 | citype != opt) \ |
---|
605 | break; \ |
---|
606 | } |
---|
607 | |
---|
608 | #define ACKCICOMPLETE(opt,neg) ACKCIVOID(opt, neg) |
---|
609 | |
---|
610 | #define ACKCICHARS(opt, neg, val, cnt) \ |
---|
611 | if (neg) { \ |
---|
612 | int indx, count = cnt; \ |
---|
613 | len -= (count + 2); \ |
---|
614 | if (len < 0) \ |
---|
615 | break; \ |
---|
616 | GETCHAR(citype, p); \ |
---|
617 | GETCHAR(cilen, p); \ |
---|
618 | if (cilen != (count + 2) || \ |
---|
619 | citype != opt) \ |
---|
620 | break; \ |
---|
621 | for (indx = 0; indx < count; ++indx) {\ |
---|
622 | GETCHAR(cichar, p); \ |
---|
623 | if (cichar != ((u_char *) &val)[indx]) \ |
---|
624 | break; \ |
---|
625 | }\ |
---|
626 | if (indx != count) \ |
---|
627 | break; \ |
---|
628 | } |
---|
629 | |
---|
630 | #define ACKCINODE(opt,neg,val) ACKCICHARS(opt,neg,val,sizeof(val)) |
---|
631 | #define ACKCINAME(opt,neg,val) ACKCICHARS(opt,neg,val,strlen(val)) |
---|
632 | |
---|
633 | #define ACKCINETWORK(opt, neg, val) \ |
---|
634 | if (neg) { \ |
---|
635 | if ((len -= CILEN_NETN) < 0) \ |
---|
636 | break; \ |
---|
637 | GETCHAR(citype, p); \ |
---|
638 | GETCHAR(cilen, p); \ |
---|
639 | if (cilen != CILEN_NETN || \ |
---|
640 | citype != opt) \ |
---|
641 | break; \ |
---|
642 | GETLONG(cilong, p); \ |
---|
643 | if (cilong != val) \ |
---|
644 | break; \ |
---|
645 | } |
---|
646 | |
---|
647 | #define ACKCIPROTO(opt, neg, val) \ |
---|
648 | if (neg) { \ |
---|
649 | if (len < 2) \ |
---|
650 | break; \ |
---|
651 | GETCHAR(citype, p); \ |
---|
652 | GETCHAR(cilen, p); \ |
---|
653 | if (cilen != CILEN_PROTOCOL || citype != opt) \ |
---|
654 | break; \ |
---|
655 | len -= cilen; \ |
---|
656 | if (len < 0) \ |
---|
657 | break; \ |
---|
658 | GETSHORT(cishort, p); \ |
---|
659 | if (cishort != to_external (val) || cishort == RIP_SAP) \ |
---|
660 | break; \ |
---|
661 | } |
---|
662 | /* |
---|
663 | * Process the ACK frame in the order in which the frame was assembled |
---|
664 | */ |
---|
665 | do { |
---|
666 | ACKCINETWORK (IPX_NETWORK_NUMBER, go->neg_nn, go->our_network); |
---|
667 | ACKCINODE (IPX_NODE_NUMBER, go->neg_node, go->our_node); |
---|
668 | ACKCINAME (IPX_ROUTER_NAME, go->neg_name, go->name); |
---|
669 | if (len > 0) |
---|
670 | ACKCIPROTO (IPX_ROUTER_PROTOCOL, go->neg_router, go->router); |
---|
671 | /* |
---|
672 | * This is the end of the record. |
---|
673 | */ |
---|
674 | if (len == 0) |
---|
675 | return (1); |
---|
676 | } while (0); |
---|
677 | /* |
---|
678 | * The frame is invalid |
---|
679 | */ |
---|
680 | IPXCPDEBUG(("ipxcp_ackci: received bad Ack!")); |
---|
681 | return (0); |
---|
682 | } |
---|
683 | |
---|
684 | /* |
---|
685 | * ipxcp_nakci - Peer has sent a NAK for some of our CIs. |
---|
686 | * This should not modify any state if the Nak is bad |
---|
687 | * or if IPXCP is in the OPENED state. |
---|
688 | * |
---|
689 | * Returns: |
---|
690 | * 0 - Nak was bad. |
---|
691 | * 1 - Nak was good. |
---|
692 | */ |
---|
693 | |
---|
694 | static int |
---|
695 | ipxcp_nakci(f, p, len) |
---|
696 | fsm *f; |
---|
697 | u_char *p; |
---|
698 | int len; |
---|
699 | { |
---|
700 | u_char citype, cilen, *next; |
---|
701 | u_short s; |
---|
702 | u_int32_t l; |
---|
703 | ipxcp_options no; /* options we've seen Naks for */ |
---|
704 | ipxcp_options try; /* options to request next time */ |
---|
705 | |
---|
706 | BZERO(&no, sizeof(no)); |
---|
707 | try = *go; |
---|
708 | |
---|
709 | while (len > CILEN_VOID) { |
---|
710 | GETCHAR (citype, p); |
---|
711 | GETCHAR (cilen, p); |
---|
712 | len -= cilen; |
---|
713 | if (len < 0) |
---|
714 | goto bad; |
---|
715 | next = &p [cilen - CILEN_VOID]; |
---|
716 | |
---|
717 | switch (citype) { |
---|
718 | case IPX_NETWORK_NUMBER: |
---|
719 | if (!go->neg_nn || no.neg_nn || (cilen != CILEN_NETN)) |
---|
720 | goto bad; |
---|
721 | no.neg_nn = 1; |
---|
722 | |
---|
723 | GETLONG(l, p); |
---|
724 | if (l && ao->accept_network) |
---|
725 | try.our_network = l; |
---|
726 | break; |
---|
727 | |
---|
728 | case IPX_NODE_NUMBER: |
---|
729 | if (!go->neg_node || no.neg_node || (cilen != CILEN_NODEN)) |
---|
730 | goto bad; |
---|
731 | no.neg_node = 1; |
---|
732 | |
---|
733 | if (!zero_node (p) && ao->accept_local && |
---|
734 | ! compare_node (p, ho->his_node)) |
---|
735 | copy_node (p, try.our_node); |
---|
736 | break; |
---|
737 | |
---|
738 | /* This has never been sent. Ignore the NAK frame */ |
---|
739 | case IPX_COMPRESSION_PROTOCOL: |
---|
740 | goto bad; |
---|
741 | |
---|
742 | case IPX_ROUTER_PROTOCOL: |
---|
743 | if (!go->neg_router || (cilen < CILEN_PROTOCOL)) |
---|
744 | goto bad; |
---|
745 | |
---|
746 | GETSHORT (s, p); |
---|
747 | if (s > 15) /* This is just bad, but ignore for now. */ |
---|
748 | break; |
---|
749 | |
---|
750 | s = BIT(s); |
---|
751 | if (no.router & s) /* duplicate NAKs are always bad */ |
---|
752 | goto bad; |
---|
753 | |
---|
754 | if (no.router == 0) /* Reset on first NAK only */ |
---|
755 | try.router = 0; |
---|
756 | |
---|
757 | no.router |= s; |
---|
758 | try.router |= s; |
---|
759 | try.neg_router = 1; |
---|
760 | break; |
---|
761 | |
---|
762 | /* These, according to the RFC, must never be NAKed. */ |
---|
763 | case IPX_ROUTER_NAME: |
---|
764 | case IPX_COMPLETE: |
---|
765 | goto bad; |
---|
766 | |
---|
767 | /* These are for options which we have not seen. */ |
---|
768 | default: |
---|
769 | break; |
---|
770 | } |
---|
771 | p = next; |
---|
772 | } |
---|
773 | |
---|
774 | /* |
---|
775 | * Do not permit the peer to force a router protocol which we do not |
---|
776 | * support. However, default to the condition that will accept "NONE". |
---|
777 | */ |
---|
778 | try.router &= (ao->router | BIT(IPX_NONE)); |
---|
779 | if (try.router == 0 && ao->router != 0) |
---|
780 | try.router = BIT(IPX_NONE); |
---|
781 | |
---|
782 | if (try.router != 0) |
---|
783 | try.neg_router = 1; |
---|
784 | |
---|
785 | /* |
---|
786 | * OK, the Nak is good. Now we can update state. |
---|
787 | * If there are any options left, we ignore them. |
---|
788 | */ |
---|
789 | if (f->state != OPENED) |
---|
790 | *go = try; |
---|
791 | |
---|
792 | return 1; |
---|
793 | |
---|
794 | bad: |
---|
795 | IPXCPDEBUG(("ipxcp_nakci: received bad Nak!")); |
---|
796 | return 0; |
---|
797 | } |
---|
798 | |
---|
799 | /* |
---|
800 | * ipxcp_rejci - Reject some of our CIs. |
---|
801 | */ |
---|
802 | static int |
---|
803 | ipxcp_rejci(f, p, len) |
---|
804 | fsm *f; |
---|
805 | u_char *p; |
---|
806 | int len; |
---|
807 | { |
---|
808 | u_short cilen, citype, cishort; |
---|
809 | u_char cichar; |
---|
810 | u_int32_t cilong; |
---|
811 | ipxcp_options try; /* options to request next time */ |
---|
812 | |
---|
813 | #define REJCINETWORK(opt, neg, val) \ |
---|
814 | if (neg && p[0] == opt) { \ |
---|
815 | if ((len -= CILEN_NETN) < 0) \ |
---|
816 | break; \ |
---|
817 | GETCHAR(citype, p); \ |
---|
818 | GETCHAR(cilen, p); \ |
---|
819 | if (cilen != CILEN_NETN || \ |
---|
820 | citype != opt) \ |
---|
821 | break; \ |
---|
822 | GETLONG(cilong, p); \ |
---|
823 | if (cilong != val) \ |
---|
824 | break; \ |
---|
825 | neg = 0; \ |
---|
826 | } |
---|
827 | |
---|
828 | #define REJCICHARS(opt, neg, val, cnt) \ |
---|
829 | if (neg && p[0] == opt) { \ |
---|
830 | int indx, count = cnt; \ |
---|
831 | len -= (count + 2); \ |
---|
832 | if (len < 0) \ |
---|
833 | break; \ |
---|
834 | GETCHAR(citype, p); \ |
---|
835 | GETCHAR(cilen, p); \ |
---|
836 | if (cilen != (count + 2) || \ |
---|
837 | citype != opt) \ |
---|
838 | break; \ |
---|
839 | for (indx = 0; indx < count; ++indx) {\ |
---|
840 | GETCHAR(cichar, p); \ |
---|
841 | if (cichar != ((u_char *) &val)[indx]) \ |
---|
842 | break; \ |
---|
843 | }\ |
---|
844 | if (indx != count) \ |
---|
845 | break; \ |
---|
846 | neg = 0; \ |
---|
847 | } |
---|
848 | |
---|
849 | #define REJCINODE(opt,neg,val) REJCICHARS(opt,neg,val,sizeof(val)) |
---|
850 | #define REJCINAME(opt,neg,val) REJCICHARS(opt,neg,val,strlen(val)) |
---|
851 | |
---|
852 | #define REJCIVOID(opt, neg) \ |
---|
853 | if (neg && p[0] == opt) { \ |
---|
854 | if ((len -= CILEN_VOID) < 0) \ |
---|
855 | break; \ |
---|
856 | GETCHAR(citype, p); \ |
---|
857 | GETCHAR(cilen, p); \ |
---|
858 | if (cilen != CILEN_VOID || citype != opt) \ |
---|
859 | break; \ |
---|
860 | neg = 0; \ |
---|
861 | } |
---|
862 | |
---|
863 | /* a reject for RIP/SAP is invalid since we don't send it and you can't |
---|
864 | reject something which is not sent. (You can NAK, but you can't REJ.) */ |
---|
865 | #define REJCIPROTO(opt, neg, val, bit) \ |
---|
866 | if (neg && p[0] == opt) { \ |
---|
867 | if ((len -= CILEN_PROTOCOL) < 0) \ |
---|
868 | break; \ |
---|
869 | GETCHAR(citype, p); \ |
---|
870 | GETCHAR(cilen, p); \ |
---|
871 | if (cilen != CILEN_PROTOCOL) \ |
---|
872 | break; \ |
---|
873 | GETSHORT(cishort, p); \ |
---|
874 | if (cishort != to_external (val) || cishort == RIP_SAP) \ |
---|
875 | break; \ |
---|
876 | neg = 0; \ |
---|
877 | } |
---|
878 | /* |
---|
879 | * Any Rejected CIs must be in exactly the same order that we sent. |
---|
880 | * Check packet length and CI length at each step. |
---|
881 | * If we find any deviations, then this packet is bad. |
---|
882 | */ |
---|
883 | try = *go; |
---|
884 | |
---|
885 | do { |
---|
886 | REJCINETWORK (IPX_NETWORK_NUMBER, try.neg_nn, try.our_network); |
---|
887 | REJCINODE (IPX_NODE_NUMBER, try.neg_node, try.our_node); |
---|
888 | REJCINAME (IPX_ROUTER_NAME, try.neg_name, try.name); |
---|
889 | REJCIPROTO (IPX_ROUTER_PROTOCOL, try.neg_router, try.router, 0); |
---|
890 | /* |
---|
891 | * This is the end of the record. |
---|
892 | */ |
---|
893 | if (len == 0) { |
---|
894 | if (f->state != OPENED) |
---|
895 | *go = try; |
---|
896 | return (1); |
---|
897 | } |
---|
898 | } while (0); |
---|
899 | /* |
---|
900 | * The frame is invalid at this point. |
---|
901 | */ |
---|
902 | IPXCPDEBUG(("ipxcp_rejci: received bad Reject!")); |
---|
903 | return 0; |
---|
904 | } |
---|
905 | |
---|
906 | /* |
---|
907 | * ipxcp_reqci - Check the peer's requested CIs and send appropriate response. |
---|
908 | * |
---|
909 | * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified |
---|
910 | * appropriately. If reject_if_disagree is non-zero, doesn't return |
---|
911 | * CONFNAK; returns CONFREJ if it can't return CONFACK. |
---|
912 | */ |
---|
913 | static int |
---|
914 | ipxcp_reqci(f, inp, len, reject_if_disagree) |
---|
915 | fsm *f; |
---|
916 | u_char *inp; /* Requested CIs */ |
---|
917 | int *len; /* Length of requested CIs */ |
---|
918 | int reject_if_disagree; |
---|
919 | { |
---|
920 | u_char *cip, *next; /* Pointer to current and next CIs */ |
---|
921 | u_short cilen, citype; /* Parsed len, type */ |
---|
922 | u_short cishort; /* Parsed short value */ |
---|
923 | u_int32_t cinetwork; /* Parsed address values */ |
---|
924 | int rc = CONFACK; /* Final packet return code */ |
---|
925 | int orc; /* Individual option return code */ |
---|
926 | u_char *p; /* Pointer to next char to parse */ |
---|
927 | u_char *ucp = inp; /* Pointer to current output char */ |
---|
928 | int l = *len; /* Length left */ |
---|
929 | |
---|
930 | /* |
---|
931 | * Reset all his options. |
---|
932 | */ |
---|
933 | BZERO(ho, sizeof(*ho)); |
---|
934 | |
---|
935 | /* |
---|
936 | * Process all his options. |
---|
937 | */ |
---|
938 | next = inp; |
---|
939 | while (l) { |
---|
940 | orc = CONFACK; /* Assume success */ |
---|
941 | cip = p = next; /* Remember begining of CI */ |
---|
942 | if (l < 2 || /* Not enough data for CI header or */ |
---|
943 | p[1] < 2 || /* CI length too small or */ |
---|
944 | p[1] > l) { /* CI length too big? */ |
---|
945 | IPXCPDEBUG(("ipxcp_reqci: bad CI length!")); |
---|
946 | orc = CONFREJ; /* Reject bad CI */ |
---|
947 | cilen = l; /* Reject till end of packet */ |
---|
948 | l = 0; /* Don't loop again */ |
---|
949 | goto endswitch; |
---|
950 | } |
---|
951 | GETCHAR(citype, p); /* Parse CI type */ |
---|
952 | GETCHAR(cilen, p); /* Parse CI length */ |
---|
953 | l -= cilen; /* Adjust remaining length */ |
---|
954 | next += cilen; /* Step to next CI */ |
---|
955 | |
---|
956 | switch (citype) { /* Check CI type */ |
---|
957 | /* |
---|
958 | * The network number must match. Choose the larger of the two. |
---|
959 | */ |
---|
960 | case IPX_NETWORK_NUMBER: |
---|
961 | /* if we wont negotiate the network number or the length is wrong |
---|
962 | then reject the option */ |
---|
963 | if ( !ao->neg_nn || cilen != CILEN_NETN ) { |
---|
964 | orc = CONFREJ; |
---|
965 | break; |
---|
966 | } |
---|
967 | GETLONG(cinetwork, p); |
---|
968 | |
---|
969 | /* If the network numbers match then acknowledge them. */ |
---|
970 | if (cinetwork != 0) { |
---|
971 | ho->his_network = cinetwork; |
---|
972 | ho->neg_nn = 1; |
---|
973 | if (wo->our_network == cinetwork) |
---|
974 | break; |
---|
975 | /* |
---|
976 | * If the network number is not given or we don't accept their change or |
---|
977 | * the network number is too small then NAK it. |
---|
978 | */ |
---|
979 | if (! ao->accept_network || cinetwork < wo->our_network) { |
---|
980 | DECPTR (sizeof (u_int32_t), p); |
---|
981 | PUTLONG (wo->our_network, p); |
---|
982 | orc = CONFNAK; |
---|
983 | } |
---|
984 | break; |
---|
985 | } |
---|
986 | /* |
---|
987 | * The peer sent '0' for the network. Give it ours if we have one. |
---|
988 | */ |
---|
989 | if (go->our_network != 0) { |
---|
990 | DECPTR (sizeof (u_int32_t), p); |
---|
991 | PUTLONG (wo->our_network, p); |
---|
992 | orc = CONFNAK; |
---|
993 | /* |
---|
994 | * We don't have one. Reject the value. |
---|
995 | */ |
---|
996 | } else |
---|
997 | orc = CONFREJ; |
---|
998 | |
---|
999 | break; |
---|
1000 | /* |
---|
1001 | * The node number is required |
---|
1002 | */ |
---|
1003 | case IPX_NODE_NUMBER: |
---|
1004 | /* if we wont negotiate the node number or the length is wrong |
---|
1005 | then reject the option */ |
---|
1006 | if ( cilen != CILEN_NODEN ) { |
---|
1007 | orc = CONFREJ; |
---|
1008 | break; |
---|
1009 | } |
---|
1010 | |
---|
1011 | copy_node (p, ho->his_node); |
---|
1012 | ho->neg_node = 1; |
---|
1013 | /* |
---|
1014 | * If the remote does not have a number and we do then NAK it with the value |
---|
1015 | * which we have for it. (We never have a default value of zero.) |
---|
1016 | */ |
---|
1017 | if (zero_node (ho->his_node)) { |
---|
1018 | orc = CONFNAK; |
---|
1019 | copy_node (wo->his_node, p); |
---|
1020 | INCPTR (sizeof (wo->his_node), p); |
---|
1021 | break; |
---|
1022 | } |
---|
1023 | /* |
---|
1024 | * If you have given me the expected network node number then I'll accept |
---|
1025 | * it now. |
---|
1026 | */ |
---|
1027 | if (compare_node (wo->his_node, ho->his_node)) { |
---|
1028 | orc = CONFACK; |
---|
1029 | ho->neg_node = 1; |
---|
1030 | INCPTR (sizeof (wo->his_node), p); |
---|
1031 | break; |
---|
1032 | } |
---|
1033 | /* |
---|
1034 | * If his node number is the same as ours then ask him to try the next |
---|
1035 | * value. |
---|
1036 | */ |
---|
1037 | if (compare_node (ho->his_node, go->our_node)) { |
---|
1038 | inc_node (ho->his_node); |
---|
1039 | orc = CONFNAK; |
---|
1040 | copy_node (ho->his_node, p); |
---|
1041 | INCPTR (sizeof (wo->his_node), p); |
---|
1042 | break; |
---|
1043 | } |
---|
1044 | /* |
---|
1045 | * If we don't accept a new value then NAK it. |
---|
1046 | */ |
---|
1047 | if (! ao->accept_remote) { |
---|
1048 | copy_node (wo->his_node, p); |
---|
1049 | INCPTR (sizeof (wo->his_node), p); |
---|
1050 | orc = CONFNAK; |
---|
1051 | break; |
---|
1052 | } |
---|
1053 | orc = CONFACK; |
---|
1054 | ho->neg_node = 1; |
---|
1055 | INCPTR (sizeof (wo->his_node), p); |
---|
1056 | break; |
---|
1057 | /* |
---|
1058 | * Compression is not desired at this time. It is always rejected. |
---|
1059 | */ |
---|
1060 | case IPX_COMPRESSION_PROTOCOL: |
---|
1061 | orc = CONFREJ; |
---|
1062 | break; |
---|
1063 | /* |
---|
1064 | * The routing protocol is a bitmask of various types. Any combination |
---|
1065 | * of the values RIP_SAP and NLSP are permissible. 'IPX_NONE' for no |
---|
1066 | * routing protocol must be specified only once. |
---|
1067 | */ |
---|
1068 | case IPX_ROUTER_PROTOCOL: |
---|
1069 | if ( !ao->neg_router || cilen < CILEN_PROTOCOL ) { |
---|
1070 | orc = CONFREJ; |
---|
1071 | break; |
---|
1072 | } |
---|
1073 | |
---|
1074 | GETSHORT (cishort, p); |
---|
1075 | |
---|
1076 | if (wo->neg_router == 0) { |
---|
1077 | wo->neg_router = 1; |
---|
1078 | wo->router = BIT(IPX_NONE); |
---|
1079 | } |
---|
1080 | |
---|
1081 | if ((cishort == IPX_NONE && ho->router != 0) || |
---|
1082 | (ho->router & BIT(IPX_NONE))) { |
---|
1083 | orc = CONFREJ; |
---|
1084 | break; |
---|
1085 | } |
---|
1086 | |
---|
1087 | cishort = BIT(cishort); |
---|
1088 | if (ho->router & cishort) { |
---|
1089 | orc = CONFREJ; |
---|
1090 | break; |
---|
1091 | } |
---|
1092 | |
---|
1093 | ho->router |= cishort; |
---|
1094 | ho->neg_router = 1; |
---|
1095 | |
---|
1096 | /* Finally do not allow a router protocol which we do not |
---|
1097 | support. */ |
---|
1098 | |
---|
1099 | if ((cishort & (ao->router | BIT(IPX_NONE))) == 0) { |
---|
1100 | int protocol; |
---|
1101 | |
---|
1102 | if (cishort == BIT(NLSP) && |
---|
1103 | (ao->router & BIT(RIP_SAP)) && |
---|
1104 | !wo->tried_rip) { |
---|
1105 | protocol = RIP_SAP; |
---|
1106 | wo->tried_rip = 1; |
---|
1107 | } else |
---|
1108 | protocol = IPX_NONE; |
---|
1109 | |
---|
1110 | DECPTR (sizeof (u_int16_t), p); |
---|
1111 | PUTSHORT (protocol, p); |
---|
1112 | orc = CONFNAK; |
---|
1113 | } |
---|
1114 | break; |
---|
1115 | /* |
---|
1116 | * The router name is advisorary. Just accept it if it is not too large. |
---|
1117 | */ |
---|
1118 | case IPX_ROUTER_NAME: |
---|
1119 | if (cilen >= CILEN_NAME) { |
---|
1120 | int name_size = cilen - CILEN_NAME; |
---|
1121 | if (name_size > sizeof (ho->name)) |
---|
1122 | name_size = sizeof (ho->name) - 1; |
---|
1123 | memset (ho->name, 0, sizeof (ho->name)); |
---|
1124 | memcpy (ho->name, p, name_size); |
---|
1125 | ho->name [name_size] = '\0'; |
---|
1126 | ho->neg_name = 1; |
---|
1127 | orc = CONFACK; |
---|
1128 | break; |
---|
1129 | } |
---|
1130 | orc = CONFREJ; |
---|
1131 | break; |
---|
1132 | /* |
---|
1133 | * This is advisorary. |
---|
1134 | */ |
---|
1135 | case IPX_COMPLETE: |
---|
1136 | if (cilen != CILEN_COMPLETE) |
---|
1137 | orc = CONFREJ; |
---|
1138 | else { |
---|
1139 | ho->neg_complete = 1; |
---|
1140 | orc = CONFACK; |
---|
1141 | } |
---|
1142 | break; |
---|
1143 | /* |
---|
1144 | * All other entries are not known at this time. |
---|
1145 | */ |
---|
1146 | default: |
---|
1147 | orc = CONFREJ; |
---|
1148 | break; |
---|
1149 | } |
---|
1150 | endswitch: |
---|
1151 | if (orc == CONFACK && /* Good CI */ |
---|
1152 | rc != CONFACK) /* but prior CI wasnt? */ |
---|
1153 | continue; /* Don't send this one */ |
---|
1154 | |
---|
1155 | if (orc == CONFNAK) { /* Nak this CI? */ |
---|
1156 | if (reject_if_disagree) /* Getting fed up with sending NAKs? */ |
---|
1157 | orc = CONFREJ; /* Get tough if so */ |
---|
1158 | if (rc == CONFREJ) /* Rejecting prior CI? */ |
---|
1159 | continue; /* Don't send this one */ |
---|
1160 | if (rc == CONFACK) { /* Ack'd all prior CIs? */ |
---|
1161 | rc = CONFNAK; /* Not anymore... */ |
---|
1162 | ucp = inp; /* Backup */ |
---|
1163 | } |
---|
1164 | } |
---|
1165 | |
---|
1166 | if (orc == CONFREJ && /* Reject this CI */ |
---|
1167 | rc != CONFREJ) { /* but no prior ones? */ |
---|
1168 | rc = CONFREJ; |
---|
1169 | ucp = inp; /* Backup */ |
---|
1170 | } |
---|
1171 | |
---|
1172 | /* Need to move CI? */ |
---|
1173 | if (ucp != cip) |
---|
1174 | BCOPY(cip, ucp, cilen); /* Move it */ |
---|
1175 | |
---|
1176 | /* Update output pointer */ |
---|
1177 | INCPTR(cilen, ucp); |
---|
1178 | } |
---|
1179 | |
---|
1180 | /* |
---|
1181 | * If we aren't rejecting this packet, and we want to negotiate |
---|
1182 | * their address, and they didn't send their address, then we |
---|
1183 | * send a NAK with a IPX_NODE_NUMBER option appended. We assume the |
---|
1184 | * input buffer is long enough that we can append the extra |
---|
1185 | * option safely. |
---|
1186 | */ |
---|
1187 | |
---|
1188 | if (rc != CONFREJ && !ho->neg_node && |
---|
1189 | wo->req_nn && !reject_if_disagree) { |
---|
1190 | if (rc == CONFACK) { |
---|
1191 | rc = CONFNAK; |
---|
1192 | wo->req_nn = 0; /* don't ask again */ |
---|
1193 | ucp = inp; /* reset pointer */ |
---|
1194 | } |
---|
1195 | |
---|
1196 | if (zero_node (wo->his_node)) |
---|
1197 | inc_node (wo->his_node); |
---|
1198 | |
---|
1199 | PUTCHAR (IPX_NODE_NUMBER, ucp); |
---|
1200 | PUTCHAR (CILEN_NODEN, ucp); |
---|
1201 | copy_node (wo->his_node, ucp); |
---|
1202 | INCPTR (sizeof (wo->his_node), ucp); |
---|
1203 | } |
---|
1204 | |
---|
1205 | *len = ucp - inp; /* Compute output length */ |
---|
1206 | IPXCPDEBUG(("ipxcp: returning Configure-%s", CODENAME(rc))); |
---|
1207 | return (rc); /* Return final code */ |
---|
1208 | } |
---|
1209 | |
---|
1210 | /* |
---|
1211 | * ipxcp_up - IPXCP has come UP. |
---|
1212 | * |
---|
1213 | * Configure the IP network interface appropriately and bring it up. |
---|
1214 | */ |
---|
1215 | |
---|
1216 | static void |
---|
1217 | ipxcp_up(f) |
---|
1218 | fsm *f; |
---|
1219 | { |
---|
1220 | int unit = f->unit; |
---|
1221 | |
---|
1222 | IPXCPDEBUG(("ipxcp: up")); |
---|
1223 | |
---|
1224 | /* The default router protocol is RIP/SAP. */ |
---|
1225 | if (ho->router == 0) |
---|
1226 | ho->router = BIT(RIP_SAP); |
---|
1227 | |
---|
1228 | if (go->router == 0) |
---|
1229 | go->router = BIT(RIP_SAP); |
---|
1230 | |
---|
1231 | /* Fetch the network number */ |
---|
1232 | if (!ho->neg_nn) |
---|
1233 | ho->his_network = wo->his_network; |
---|
1234 | |
---|
1235 | if (!ho->neg_node) |
---|
1236 | copy_node (wo->his_node, ho->his_node); |
---|
1237 | |
---|
1238 | if (!wo->neg_node && !go->neg_node) |
---|
1239 | copy_node (wo->our_node, go->our_node); |
---|
1240 | |
---|
1241 | if (zero_node (go->our_node)) { |
---|
1242 | static char errmsg[] = "Could not determine local IPX node address"; |
---|
1243 | if (debug) |
---|
1244 | error(errmsg); |
---|
1245 | ipxcp_close(f->unit, errmsg); |
---|
1246 | return; |
---|
1247 | } |
---|
1248 | |
---|
1249 | go->network = go->our_network; |
---|
1250 | if (ho->his_network != 0 && ho->his_network > go->network) |
---|
1251 | go->network = ho->his_network; |
---|
1252 | |
---|
1253 | if (go->network == 0) { |
---|
1254 | static char errmsg[] = "Can not determine network number"; |
---|
1255 | if (debug) |
---|
1256 | error(errmsg); |
---|
1257 | ipxcp_close (unit, errmsg); |
---|
1258 | return; |
---|
1259 | } |
---|
1260 | |
---|
1261 | /* bring the interface up */ |
---|
1262 | if (!sifup(unit)) { |
---|
1263 | if (debug) |
---|
1264 | warn("sifup failed (IPX)"); |
---|
1265 | ipxcp_close(unit, "Interface configuration failed"); |
---|
1266 | return; |
---|
1267 | } |
---|
1268 | ipxcp_is_up = 1; |
---|
1269 | |
---|
1270 | /* set the network number for IPX */ |
---|
1271 | if (!sipxfaddr(unit, go->network, go->our_node)) { |
---|
1272 | if (debug) |
---|
1273 | warn("sipxfaddr failed"); |
---|
1274 | ipxcp_close(unit, "Interface configuration failed"); |
---|
1275 | return; |
---|
1276 | } |
---|
1277 | |
---|
1278 | np_up(f->unit, PPP_IPX); |
---|
1279 | } |
---|
1280 | |
---|
1281 | /* |
---|
1282 | * ipxcp_down - IPXCP has gone DOWN. |
---|
1283 | * |
---|
1284 | * Take the IP network interface down, clear its addresses |
---|
1285 | * and delete routes through it. |
---|
1286 | */ |
---|
1287 | |
---|
1288 | static void |
---|
1289 | ipxcp_down(f) |
---|
1290 | fsm *f; |
---|
1291 | { |
---|
1292 | IPXCPDEBUG(("ipxcp: down")); |
---|
1293 | |
---|
1294 | if (!ipxcp_is_up) |
---|
1295 | return; |
---|
1296 | ipxcp_is_up = 0; |
---|
1297 | np_down(f->unit, PPP_IPX); |
---|
1298 | cipxfaddr(f->unit); |
---|
1299 | sifnpmode(f->unit, PPP_IPX, NPMODE_DROP); |
---|
1300 | sifdown(f->unit); |
---|
1301 | } |
---|
1302 | |
---|
1303 | |
---|
1304 | /* |
---|
1305 | * ipxcp_finished - possibly shut down the lower layers. |
---|
1306 | */ |
---|
1307 | static void |
---|
1308 | ipxcp_finished(f) |
---|
1309 | fsm *f; |
---|
1310 | { |
---|
1311 | np_finished(f->unit, PPP_IPX); |
---|
1312 | } |
---|
1313 | |
---|
1314 | |
---|
1315 | /* |
---|
1316 | * ipxcp_printpkt - print the contents of an IPXCP packet. |
---|
1317 | */ |
---|
1318 | static char *ipxcp_codenames[] = { |
---|
1319 | "ConfReq", "ConfAck", "ConfNak", "ConfRej", |
---|
1320 | "TermReq", "TermAck", "CodeRej" |
---|
1321 | }; |
---|
1322 | |
---|
1323 | static int |
---|
1324 | ipxcp_printpkt(p, plen, printer, arg) |
---|
1325 | u_char *p; |
---|
1326 | int plen; |
---|
1327 | void (*printer) __P((void *, char *, ...)); |
---|
1328 | void *arg; |
---|
1329 | { |
---|
1330 | int code, id, len, olen; |
---|
1331 | u_char *pstart, *optend; |
---|
1332 | u_short cishort; |
---|
1333 | u_int32_t cilong; |
---|
1334 | |
---|
1335 | if (plen < HEADERLEN) |
---|
1336 | return 0; |
---|
1337 | pstart = p; |
---|
1338 | GETCHAR(code, p); |
---|
1339 | GETCHAR(id, p); |
---|
1340 | GETSHORT(len, p); |
---|
1341 | if (len < HEADERLEN || len > plen) |
---|
1342 | return 0; |
---|
1343 | |
---|
1344 | if (code >= 1 && code <= sizeof(ipxcp_codenames) / sizeof(char *)) |
---|
1345 | printer(arg, " %s", ipxcp_codenames[code-1]); |
---|
1346 | else |
---|
1347 | printer(arg, " code=0x%x", code); |
---|
1348 | printer(arg, " id=0x%x", id); |
---|
1349 | len -= HEADERLEN; |
---|
1350 | switch (code) { |
---|
1351 | case CONFREQ: |
---|
1352 | case CONFACK: |
---|
1353 | case CONFNAK: |
---|
1354 | case CONFREJ: |
---|
1355 | /* print option list */ |
---|
1356 | while (len >= 2) { |
---|
1357 | GETCHAR(code, p); |
---|
1358 | GETCHAR(olen, p); |
---|
1359 | p -= 2; |
---|
1360 | if (olen < CILEN_VOID || olen > len) { |
---|
1361 | break; |
---|
1362 | } |
---|
1363 | printer(arg, " <"); |
---|
1364 | len -= olen; |
---|
1365 | optend = p + olen; |
---|
1366 | switch (code) { |
---|
1367 | case IPX_NETWORK_NUMBER: |
---|
1368 | if (olen == CILEN_NETN) { |
---|
1369 | p += 2; |
---|
1370 | GETLONG(cilong, p); |
---|
1371 | printer (arg, "network %s", ipx_ntoa (cilong)); |
---|
1372 | } |
---|
1373 | break; |
---|
1374 | case IPX_NODE_NUMBER: |
---|
1375 | if (olen == CILEN_NODEN) { |
---|
1376 | p += 2; |
---|
1377 | printer (arg, "node "); |
---|
1378 | while (p < optend) { |
---|
1379 | GETCHAR(code, p); |
---|
1380 | printer(arg, "%.2x", (int) (unsigned int) (unsigned char) code); |
---|
1381 | } |
---|
1382 | } |
---|
1383 | break; |
---|
1384 | case IPX_COMPRESSION_PROTOCOL: |
---|
1385 | if (olen == CILEN_COMPRESS) { |
---|
1386 | p += 2; |
---|
1387 | GETSHORT (cishort, p); |
---|
1388 | printer (arg, "compression %d", (int) cishort); |
---|
1389 | } |
---|
1390 | break; |
---|
1391 | case IPX_ROUTER_PROTOCOL: |
---|
1392 | if (olen == CILEN_PROTOCOL) { |
---|
1393 | p += 2; |
---|
1394 | GETSHORT (cishort, p); |
---|
1395 | printer (arg, "router proto %d", (int) cishort); |
---|
1396 | } |
---|
1397 | break; |
---|
1398 | case IPX_ROUTER_NAME: |
---|
1399 | if (olen >= CILEN_NAME) { |
---|
1400 | p += 2; |
---|
1401 | printer (arg, "router name \""); |
---|
1402 | while (p < optend) { |
---|
1403 | GETCHAR(code, p); |
---|
1404 | if (code >= 0x20 && code <= 0x7E) |
---|
1405 | printer (arg, "%c", (int) (unsigned int) (unsigned char) code); |
---|
1406 | else |
---|
1407 | printer (arg, " \\%.2x", (int) (unsigned int) (unsigned char) code); |
---|
1408 | } |
---|
1409 | printer (arg, "\""); |
---|
1410 | } |
---|
1411 | break; |
---|
1412 | case IPX_COMPLETE: |
---|
1413 | if (olen == CILEN_COMPLETE) { |
---|
1414 | p += 2; |
---|
1415 | printer (arg, "complete"); |
---|
1416 | } |
---|
1417 | break; |
---|
1418 | default: |
---|
1419 | break; |
---|
1420 | } |
---|
1421 | |
---|
1422 | while (p < optend) { |
---|
1423 | GETCHAR(code, p); |
---|
1424 | printer(arg, " %.2x", (int) (unsigned int) (unsigned char) code); |
---|
1425 | } |
---|
1426 | printer(arg, ">"); |
---|
1427 | } |
---|
1428 | break; |
---|
1429 | |
---|
1430 | case TERMACK: |
---|
1431 | case TERMREQ: |
---|
1432 | if (len > 0 && *p >= ' ' && *p < 0x7f) { |
---|
1433 | printer(arg, " "); |
---|
1434 | print_string(p, len, printer, arg); |
---|
1435 | p += len; |
---|
1436 | len = 0; |
---|
1437 | } |
---|
1438 | break; |
---|
1439 | } |
---|
1440 | |
---|
1441 | /* print the rest of the bytes in the packet */ |
---|
1442 | for (; len > 0; --len) { |
---|
1443 | GETCHAR(code, p); |
---|
1444 | printer(arg, " %.2x", (int) (unsigned int) (unsigned char) code); |
---|
1445 | } |
---|
1446 | |
---|
1447 | return p - pstart; |
---|
1448 | } |
---|
1449 | #endif /* ifdef IPX_CHANGE */ |
---|