2 * fsm.h - {Link, IP} Control Protocol Finite State Machine definitions.
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42 * $Id: fsm.h,v 1.9 2002/12/04 23:03:32 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 maxnakloops; /* Maximum number of nak loops tolerated */
80 struct fsm_callbacks *callbacks; /* Callback routines */
81 char *term_reason; /* Reason for closing protocol */
82 int term_reason_len; /* Length of term_reason */
86 typedef struct fsm_callbacks {
87 void (*resetci) /* Reset our Configuration Information */
89 int (*cilen) /* Length of our Configuration Information */
91 void (*addci) /* Add our Configuration Information */
92 __P((fsm *, u_char *, int *));
93 int (*ackci) /* ACK our Configuration Information */
94 __P((fsm *, u_char *, int));
95 int (*nakci) /* NAK our Configuration Information */
96 __P((fsm *, u_char *, int));
97 int (*rejci) /* Reject our Configuration Information */
98 __P((fsm *, u_char *, int));
99 int (*reqci) /* Request peer's Configuration Information */
100 __P((fsm *, u_char *, int *, int));
101 void (*up) /* Called when fsm reaches OPENED state */
103 void (*down) /* Called when fsm leaves OPENED state */
105 void (*starting) /* Called when we want the lower layer */
107 void (*finished) /* Called when we don't want the lower layer */
109 void (*protreject) /* Called when Protocol-Reject received */
111 void (*retransmit) /* Retransmission is necessary */
113 int (*extcode) /* Called when unknown code received */
114 __P((fsm *, int, int, u_char *, int));
115 char *proto_name; /* String name for protocol (for messages) */
122 #define INITIAL 0 /* Down, hasn't been opened */
123 #define STARTING 1 /* Down, been opened */
124 #define CLOSED 2 /* Up, hasn't been opened */
125 #define STOPPED 3 /* Open, waiting for down event */
126 #define CLOSING 4 /* Terminating the connection, not open */
127 #define STOPPING 5 /* Terminating, but open */
128 #define REQSENT 6 /* We've sent a Config Request */
129 #define ACKRCVD 7 /* We've received a Config Ack */
130 #define ACKSENT 8 /* We've sent a Config Ack */
131 #define OPENED 9 /* Connection available */
135 * Flags - indicate options controlling FSM operation
137 #define OPT_PASSIVE 1 /* Don't die if we don't get a response */
138 #define OPT_RESTART 2 /* Treat 2nd OPEN as DOWN, UP */
139 #define OPT_SILENT 4 /* Wait for peer to speak first */
145 #define DEFTIMEOUT 3 /* Timeout time in seconds */
146 #define DEFMAXTERMREQS 2 /* Maximum Terminate-Request transmissions */
147 #define DEFMAXCONFREQS 10 /* Maximum Configure-Request transmissions */
148 #define DEFMAXNAKLOOPS 5 /* Maximum number of nak loops */
154 void fsm_init __P((fsm *));
155 void fsm_lowerup __P((fsm *));
156 void fsm_lowerdown __P((fsm *));
157 void fsm_open __P((fsm *));
158 void fsm_close __P((fsm *, char *));
159 void fsm_input __P((fsm *, u_char *, int));
160 void fsm_protreject __P((fsm *));
161 void fsm_sdata __P((fsm *, int, int, u_char *, int));
167 extern int peer_mru[]; /* currently negotiated peer MRU (per unit) */