1 /*****************************************************************************
2 * fsm.h - Network Control Protocol Finite State Machine header file.
4 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
5 * Copyright (c) 1997 Global Election Systems Inc.
7 * The authors hereby grant permission to use, copy, modify, distribute,
8 * and license this software and its documentation for any purpose, provided
9 * that existing copyright notices are retained in all copies and that this
10 * notice and the following disclaimer are included verbatim in any
11 * distributions. No written agreement, license, or royalty fee is required
12 * for any of the authorized uses.
14 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 ******************************************************************************
28 * 03-01-01 Marc Boucher <marc@mbsi.ca>
30 * 97-11-05 Guy Lancaster <glanca@gesn.com>, Global Election Systems Inc.
31 * Original based on BSD code.
32 *****************************************************************************/
34 * fsm.h - {Link, IP} Control Protocol Finite State Machine definitions.
36 * Copyright (c) 1989 Carnegie Mellon University.
37 * All rights reserved.
39 * Redistribution and use in source and binary forms are permitted
40 * provided that the above copyright notice and this paragraph are
41 * duplicated in all such forms and that any documentation,
42 * advertising materials, and other materials related to such
43 * distribution and use acknowledge that the software was developed
44 * by Carnegie Mellon University. The name of the
45 * University may not be used to endorse or promote products derived
46 * from this software without specific prior written permission.
47 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
48 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
49 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
51 * $Id: fsm.h,v 1.4 2007/12/19 20:47:23 fbernon Exp $
57 /*****************************************************************************
58 ************************* PUBLIC DEFINITIONS *********************************
59 *****************************************************************************/
61 * LCP Packet header = Code, id, length.
63 #define HEADERLEN (sizeof (u_char) + sizeof (u_char) + sizeof (u_short))
67 * CP (LCP, IPCP, etc.) codes.
69 #define CONFREQ 1 /* Configuration Request */
70 #define CONFACK 2 /* Configuration Ack */
71 #define CONFNAK 3 /* Configuration Nak */
72 #define CONFREJ 4 /* Configuration Reject */
73 #define TERMREQ 5 /* Termination Request */
74 #define TERMACK 6 /* Termination Ack */
75 #define CODEREJ 7 /* Code Reject */
80 #define LS_INITIAL 0 /* Down, hasn't been opened */
81 #define LS_STARTING 1 /* Down, been opened */
82 #define LS_CLOSED 2 /* Up, hasn't been opened */
83 #define LS_STOPPED 3 /* Open, waiting for down event */
84 #define LS_CLOSING 4 /* Terminating the connection, not open */
85 #define LS_STOPPING 5 /* Terminating, but open */
86 #define LS_REQSENT 6 /* We've sent a Config Request */
87 #define LS_ACKRCVD 7 /* We've received a Config Ack */
88 #define LS_ACKSENT 8 /* We've sent a Config Ack */
89 #define LS_OPENED 9 /* Connection available */
92 * Flags - indicate options controlling FSM operation
94 #define OPT_PASSIVE 1 /* Don't die if we don't get a response */
95 #define OPT_RESTART 2 /* Treat 2nd OPEN as DOWN, UP */
96 #define OPT_SILENT 4 /* Wait for peer to speak first */
99 /*****************************************************************************
100 ************************* PUBLIC DATA TYPES **********************************
101 *****************************************************************************/
103 * Each FSM is described by an fsm structure and fsm callbacks.
106 int unit; /* Interface unit number */
107 u_short protocol; /* Data Link Layer Protocol field value */
108 int state; /* State */
109 int flags; /* Contains option bits */
110 u_char id; /* Current id */
111 u_char reqid; /* Current request id */
112 u_char seen_ack; /* Have received valid Ack/Nak/Rej to Req */
113 int timeouttime; /* Timeout time in milliseconds */
114 int maxconfreqtransmits; /* Maximum Configure-Request transmissions */
115 int retransmits; /* Number of retransmissions left */
116 int maxtermtransmits; /* Maximum Terminate-Request transmissions */
117 int nakloops; /* Number of nak loops since last ack */
118 int maxnakloops; /* Maximum number of nak loops tolerated */
119 struct fsm_callbacks* callbacks; /* Callback routines */
120 char* term_reason; /* Reason for closing protocol */
121 int term_reason_len; /* Length of term_reason */
125 typedef struct fsm_callbacks {
126 void (*resetci)(fsm*); /* Reset our Configuration Information */
127 int (*cilen)(fsm*); /* Length of our Configuration Information */
128 void (*addci)(fsm*, u_char*, int*); /* Add our Configuration Information */
129 int (*ackci)(fsm*, u_char*, int); /* ACK our Configuration Information */
130 int (*nakci)(fsm*, u_char*, int); /* NAK our Configuration Information */
131 int (*rejci)(fsm*, u_char*, int); /* Reject our Configuration Information */
132 int (*reqci)(fsm*, u_char*, int*, int); /* Request peer's Configuration Information */
133 void (*up)(fsm*); /* Called when fsm reaches LS_OPENED state */
134 void (*down)(fsm*); /* Called when fsm leaves LS_OPENED state */
135 void (*starting)(fsm*); /* Called when we want the lower layer */
136 void (*finished)(fsm*); /* Called when we don't want the lower layer */
137 void (*protreject)(int); /* Called when Protocol-Reject received */
138 void (*retransmit)(fsm*); /* Retransmission is necessary */
139 int (*extcode)(fsm*, int, u_char, u_char*, int); /* Called when unknown code received */
140 char *proto_name; /* String name for protocol (for messages) */
144 /*****************************************************************************
145 *********************** PUBLIC DATA STRUCTURES *******************************
146 *****************************************************************************/
150 extern int peer_mru[]; /* currently negotiated peer MRU (per unit) */
153 /*****************************************************************************
154 ************************** PUBLIC FUNCTIONS **********************************
155 *****************************************************************************/
160 void fsm_init (fsm*);
161 void fsm_lowerup (fsm*);
162 void fsm_lowerdown (fsm*);
163 void fsm_open (fsm*);
164 void fsm_close (fsm*, char*);
165 void fsm_input (fsm*, u_char*, int);
166 void fsm_protreject (fsm*);
167 void fsm_sdata (fsm*, u_char, u_char, u_char*, int);