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