1 /*****************************************************************************
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2 * fsm.h - Network Control Protocol Finite State Machine header file.
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4 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
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5 * Copyright (c) 1997 Global Election Systems Inc.
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7 * The authors hereby grant permission to use, copy, modify, distribute,
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8 * and license this software and its documentation for any purpose, provided
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9 * that existing copyright notices are retained in all copies and that this
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10 * notice and the following disclaimer are included verbatim in any
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11 * distributions. No written agreement, license, or royalty fee is required
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12 * for any of the authorized uses.
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14 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
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15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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17 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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25 ******************************************************************************
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28 * 03-01-01 Marc Boucher <marc@mbsi.ca>
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30 * 97-11-05 Guy Lancaster <glanca@gesn.com>, Global Election Systems Inc.
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31 * Original based on BSD code.
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32 *****************************************************************************/
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34 * fsm.h - {Link, IP} Control Protocol Finite State Machine definitions.
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36 * Copyright (c) 1989 Carnegie Mellon University.
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37 * All rights reserved.
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39 * Redistribution and use in source and binary forms are permitted
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40 * provided that the above copyright notice and this paragraph are
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41 * duplicated in all such forms and that any documentation,
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42 * advertising materials, and other materials related to such
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43 * distribution and use acknowledge that the software was developed
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44 * by Carnegie Mellon University. The name of the
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45 * University may not be used to endorse or promote products derived
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46 * from this software without specific prior written permission.
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47 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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48 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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49 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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51 * $Id: fsm.h,v 1.1 2003/05/27 14:37:56 jani Exp $
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58 /*****************************************************************************
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59 ************************* PUBLIC DEFINITIONS *********************************
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60 *****************************************************************************/
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62 * LCP Packet header = Code, id, length.
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64 #define HEADERLEN (sizeof (u_char) + sizeof (u_char) + sizeof (u_short))
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68 * CP (LCP, IPCP, etc.) codes.
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70 #define CONFREQ 1 /* Configuration Request */
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71 #define CONFACK 2 /* Configuration Ack */
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72 #define CONFNAK 3 /* Configuration Nak */
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73 #define CONFREJ 4 /* Configuration Reject */
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74 #define TERMREQ 5 /* Termination Request */
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75 #define TERMACK 6 /* Termination Ack */
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76 #define CODEREJ 7 /* Code Reject */
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81 #define INITIAL 0 /* Down, hasn't been opened */
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82 #define STARTING 1 /* Down, been opened */
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83 #define CLOSED 2 /* Up, hasn't been opened */
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84 #define STOPPED 3 /* Open, waiting for down event */
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85 #define CLOSING 4 /* Terminating the connection, not open */
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86 #define STOPPING 5 /* Terminating, but open */
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87 #define REQSENT 6 /* We've sent a Config Request */
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88 #define ACKRCVD 7 /* We've received a Config Ack */
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89 #define ACKSENT 8 /* We've sent a Config Ack */
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90 #define OPENED 9 /* Connection available */
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94 * Flags - indicate options controlling FSM operation
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96 #define OPT_PASSIVE 1 /* Don't die if we don't get a response */
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97 #define OPT_RESTART 2 /* Treat 2nd OPEN as DOWN, UP */
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98 #define OPT_SILENT 4 /* Wait for peer to speak first */
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101 /*****************************************************************************
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102 ************************* PUBLIC DATA TYPES **********************************
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103 *****************************************************************************/
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105 * Each FSM is described by an fsm structure and fsm callbacks.
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107 typedef struct fsm {
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108 int unit; /* Interface unit number */
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109 u_short protocol; /* Data Link Layer Protocol field value */
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110 int state; /* State */
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111 int flags; /* Contains option bits */
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112 u_char id; /* Current id */
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113 u_char reqid; /* Current request id */
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114 u_char seen_ack; /* Have received valid Ack/Nak/Rej to Req */
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115 int timeouttime; /* Timeout time in milliseconds */
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116 int maxconfreqtransmits;/* Maximum Configure-Request transmissions */
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117 int retransmits; /* Number of retransmissions left */
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118 int maxtermtransmits; /* Maximum Terminate-Request transmissions */
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119 int nakloops; /* Number of nak loops since last ack */
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120 int maxnakloops; /* Maximum number of nak loops tolerated */
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121 struct fsm_callbacks* callbacks;/* Callback routines */
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122 char* term_reason; /* Reason for closing protocol */
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123 int term_reason_len; /* Length of term_reason */
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127 typedef struct fsm_callbacks {
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128 void (*resetci) /* Reset our Configuration Information */
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130 int (*cilen) /* Length of our Configuration Information */
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132 void (*addci) /* Add our Configuration Information */
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133 (fsm*, u_char*, int*);
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134 int (*ackci) /* ACK our Configuration Information */
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135 (fsm*, u_char*, int);
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136 int (*nakci) /* NAK our Configuration Information */
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137 (fsm*, u_char*, int);
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138 int (*rejci) /* Reject our Configuration Information */
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139 (fsm*, u_char*, int);
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140 int (*reqci) /* Request peer's Configuration Information */
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141 (fsm*, u_char*, int*, int);
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142 void (*up) /* Called when fsm reaches OPENED state */
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144 void (*down) /* Called when fsm leaves OPENED state */
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146 void (*starting) /* Called when we want the lower layer */
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148 void (*finished) /* Called when we don't want the lower layer */
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150 void (*protreject) /* Called when Protocol-Reject received */
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152 void (*retransmit) /* Retransmission is necessary */
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154 int (*extcode) /* Called when unknown code received */
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155 (fsm*, int, u_char, u_char*, int);
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156 char *proto_name; /* String name for protocol (for messages) */
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160 /*****************************************************************************
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161 *********************** PUBLIC DATA STRUCTURES *******************************
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162 *****************************************************************************/
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166 extern int peer_mru[]; /* currently negotiated peer MRU (per unit) */
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169 /*****************************************************************************
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170 ************************** PUBLIC FUNCTIONS **********************************
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171 *****************************************************************************/
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176 void fsm_init (fsm*);
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177 void fsm_lowerup (fsm*);
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178 void fsm_lowerdown (fsm*);
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179 void fsm_open (fsm*);
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180 void fsm_close (fsm*, char*);
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181 void fsm_input (fsm*, u_char*, int);
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182 void fsm_protreject (fsm*);
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183 void fsm_sdata (fsm*, u_char, u_char, u_char*, int);
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