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 1.1 2003/05/27 14:37:56 jani Exp $
58
/*****************************************************************************
59
************************* PUBLIC DEFINITIONS *********************************
60
*****************************************************************************/
62
* LCP Packet header = Code, id, length.
64
#define HEADERLEN (sizeof (u_char) + sizeof (u_char) + sizeof (u_short))
68
* CP (LCP, IPCP, etc.) codes.
70
#define CONFREQ 1 /* Configuration Request */
71
#define CONFACK 2 /* Configuration Ack */
72
#define CONFNAK 3 /* Configuration Nak */
73
#define CONFREJ 4 /* Configuration Reject */
74
#define TERMREQ 5 /* Termination Request */
75
#define TERMACK 6 /* Termination Ack */
76
#define CODEREJ 7 /* Code Reject */
81
#define INITIAL 0 /* Down, hasn't been opened */
82
#define STARTING 1 /* Down, been opened */
83
#define CLOSED 2 /* Up, hasn't been opened */
84
#define STOPPED 3 /* Open, waiting for down event */
85
#define CLOSING 4 /* Terminating the connection, not open */
86
#define STOPPING 5 /* Terminating, but open */
87
#define REQSENT 6 /* We've sent a Config Request */
88
#define ACKRCVD 7 /* We've received a Config Ack */
89
#define ACKSENT 8 /* We've sent a Config Ack */
90
#define OPENED 9 /* Connection available */
94
* Flags - indicate options controlling FSM operation
96
#define OPT_PASSIVE 1 /* Don't die if we don't get a response */
97
#define OPT_RESTART 2 /* Treat 2nd OPEN as DOWN, UP */
98
#define OPT_SILENT 4 /* Wait for peer to speak first */
101
/*****************************************************************************
102
************************* PUBLIC DATA TYPES **********************************
103
*****************************************************************************/
105
* Each FSM is described by an fsm structure and fsm callbacks.
108
int unit; /* Interface unit number */
109
u_short protocol; /* Data Link Layer Protocol field value */
110
int state; /* State */
111
int flags; /* Contains option bits */
112
u_char id; /* Current id */
113
u_char reqid; /* Current request id */
114
u_char seen_ack; /* Have received valid Ack/Nak/Rej to Req */
115
int timeouttime; /* Timeout time in milliseconds */
116
int maxconfreqtransmits;/* Maximum Configure-Request transmissions */
117
int retransmits; /* Number of retransmissions left */
118
int maxtermtransmits; /* Maximum Terminate-Request transmissions */
119
int nakloops; /* Number of nak loops since last ack */
120
int maxnakloops; /* Maximum number of nak loops tolerated */
121
struct fsm_callbacks* callbacks;/* Callback routines */
122
char* term_reason; /* Reason for closing protocol */
123
int term_reason_len; /* Length of term_reason */
127
typedef struct fsm_callbacks {
128
void (*resetci) /* Reset our Configuration Information */
130
int (*cilen) /* Length of our Configuration Information */
132
void (*addci) /* Add our Configuration Information */
133
(fsm*, u_char*, int*);
134
int (*ackci) /* ACK our Configuration Information */
135
(fsm*, u_char*, int);
136
int (*nakci) /* NAK our Configuration Information */
137
(fsm*, u_char*, int);
138
int (*rejci) /* Reject our Configuration Information */
139
(fsm*, u_char*, int);
140
int (*reqci) /* Request peer's Configuration Information */
141
(fsm*, u_char*, int*, int);
142
void (*up) /* Called when fsm reaches OPENED state */
144
void (*down) /* Called when fsm leaves OPENED state */
146
void (*starting) /* Called when we want the lower layer */
148
void (*finished) /* Called when we don't want the lower layer */
150
void (*protreject) /* Called when Protocol-Reject received */
152
void (*retransmit) /* Retransmission is necessary */
154
int (*extcode) /* Called when unknown code received */
155
(fsm*, int, u_char, u_char*, int);
156
char *proto_name; /* String name for protocol (for messages) */
160
/*****************************************************************************
161
*********************** PUBLIC DATA STRUCTURES *******************************
162
*****************************************************************************/
166
extern int peer_mru[]; /* currently negotiated peer MRU (per unit) */
169
/*****************************************************************************
170
************************** PUBLIC FUNCTIONS **********************************
171
*****************************************************************************/
176
void fsm_init (fsm*);
177
void fsm_lowerup (fsm*);
178
void fsm_lowerdown (fsm*);
179
void fsm_open (fsm*);
180
void fsm_close (fsm*, char*);
181
void fsm_input (fsm*, u_char*, int);
182
void fsm_protreject (fsm*);
183
void fsm_sdata (fsm*, u_char, u_char, u_char*, int);