2 * fsm.h - {Link, IP} Control Protocol Finite State Machine definitions.
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42 * $Id: fsm.h,v 1.10 2004/11/13 02:28:15 paulus Exp $
46 * Packet header = Code, id, length.
52 * CP (LCP, IPCP, etc.) codes.
54 #define CONFREQ 1 /* Configuration Request */
55 #define CONFACK 2 /* Configuration Ack */
56 #define CONFNAK 3 /* Configuration Nak */
57 #define CONFREJ 4 /* Configuration Reject */
58 #define TERMREQ 5 /* Termination Request */
59 #define TERMACK 6 /* Termination Ack */
60 #define CODEREJ 7 /* Code Reject */
64 * Each FSM is described by an fsm structure and fsm callbacks.
67 int unit; /* Interface unit number */
68 int protocol; /* Data Link Layer Protocol field value */
69 int state; /* State */
70 int flags; /* Contains option bits */
71 u_char id; /* Current id */
72 u_char reqid; /* Current request id */
73 u_char seen_ack; /* Have received valid Ack/Nak/Rej to Req */
74 int timeouttime; /* Timeout time in milliseconds */
75 int maxconfreqtransmits; /* Maximum Configure-Request transmissions */
76 int retransmits; /* Number of retransmissions left */
77 int maxtermtransmits; /* Maximum Terminate-Request transmissions */
78 int nakloops; /* Number of nak loops since last ack */
79 int rnakloops; /* Number of naks received */
80 int maxnakloops; /* Maximum number of nak loops tolerated */
81 struct fsm_callbacks *callbacks; /* Callback routines */
82 char *term_reason; /* Reason for closing protocol */
83 int term_reason_len; /* Length of term_reason */
87 typedef struct fsm_callbacks {
88 void (*resetci)(fsm *); /* Reset our Configuration Information */
89 int (*cilen)(fsm *); /* Length of our Configuration Information */
90 void (*addci) /* Add our Configuration Information */
91 (fsm *, u_char *, int *);
92 int (*ackci) /* ACK our Configuration Information */
93 (fsm *, u_char *, int);
94 int (*nakci) /* NAK our Configuration Information */
95 (fsm *, u_char *, int, int);
96 int (*rejci) /* Reject our Configuration Information */
97 (fsm *, u_char *, int);
98 int (*reqci) /* Request peer's Configuration Information */
99 (fsm *, u_char *, int *, int);
100 void (*up)(fsm *); /* Called when fsm reaches OPENED state */
101 void (*down)(fsm *); /* Called when fsm leaves OPENED state */
102 void (*starting)(fsm *); /* Called when we want the lower layer */
103 void (*finished)(fsm *); /* Called when we don't want the lower layer */
104 void (*protreject)(int); /* Called when Protocol-Reject received */
105 void (*retransmit)(fsm *); /* Retransmission is necessary */
106 int (*extcode) /* Called when unknown code received */
107 (fsm *, int, int, u_char *, int);
108 char *proto_name; /* String name for protocol (for messages) */
115 #define INITIAL 0 /* Down, hasn't been opened */
116 #define STARTING 1 /* Down, been opened */
117 #define CLOSED 2 /* Up, hasn't been opened */
118 #define STOPPED 3 /* Open, waiting for down event */
119 #define CLOSING 4 /* Terminating the connection, not open */
120 #define STOPPING 5 /* Terminating, but open */
121 #define REQSENT 6 /* We've sent a Config Request */
122 #define ACKRCVD 7 /* We've received a Config Ack */
123 #define ACKSENT 8 /* We've sent a Config Ack */
124 #define OPENED 9 /* Connection available */
128 * Flags - indicate options controlling FSM operation
130 #define OPT_PASSIVE 1 /* Don't die if we don't get a response */
131 #define OPT_RESTART 2 /* Treat 2nd OPEN as DOWN, UP */
132 #define OPT_SILENT 4 /* Wait for peer to speak first */
138 #define DEFTIMEOUT 3 /* Timeout time in seconds */
139 #define DEFMAXTERMREQS 2 /* Maximum Terminate-Request transmissions */
140 #define DEFMAXCONFREQS 10 /* Maximum Configure-Request transmissions */
141 #define DEFMAXNAKLOOPS 5 /* Maximum number of nak loops */
147 void fsm_init (fsm *);
148 void fsm_lowerup (fsm *);
149 void fsm_lowerdown (fsm *);
150 void fsm_open (fsm *);
151 void fsm_close (fsm *, char *);
152 void fsm_input (fsm *, u_char *, int);
153 void fsm_protreject (fsm *);
154 void fsm_sdata (fsm *, int, int, u_char *, int);
160 extern int peer_mru[]; /* currently negotiated peer MRU (per unit) */