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Diffstat (limited to 'usr.sbin/pppd/fsm.h')
| -rw-r--r-- | usr.sbin/pppd/fsm.h | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/usr.sbin/pppd/fsm.h b/usr.sbin/pppd/fsm.h new file mode 100644 index 000000000000..a12966bef488 --- /dev/null +++ b/usr.sbin/pppd/fsm.h @@ -0,0 +1,127 @@ +/* + * fsm.h - {Link, IP} Control Protocol Finite State Machine definitions. + * + * Copyright (c) 1989 Carnegie Mellon University. + * All rights reserved. + * + * Redistribution and use in source and binary forms are permitted + * provided that the above copyright notice and this paragraph are + * duplicated in all such forms and that any documentation, + * advertising materials, and other materials related to such + * distribution and use acknowledge that the software was developed + * by Carnegie Mellon University. The name of the + * University may not be used to endorse or promote products derived + * from this software without specific prior written permission. + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. + * + * $Id: fsm.h,v 1.2 1994/04/11 07:18:35 paulus Exp $ + */ + +/* + * Packet header = Code, id, length. + */ +#define HEADERLEN (sizeof (u_char) + sizeof (u_char) + sizeof (u_short)) + + +/* + * CP (LCP, IPCP, etc.) codes. + */ +#define CONFREQ 1 /* Configuration Request */ +#define CONFACK 2 /* Configuration Ack */ +#define CONFNAK 3 /* Configuration Nak */ +#define CONFREJ 4 /* Configuration Reject */ +#define TERMREQ 5 /* Termination Request */ +#define TERMACK 6 /* Termination Ack */ +#define CODEREJ 7 /* Code Reject */ + + +/* + * Each FSM is described by a fsm_callbacks and a fsm structure. + */ +typedef struct fsm_callbacks { + void (*resetci)(); /* Reset our Configuration Information */ + int (*cilen)(); /* Length of our Configuration Information */ + void (*addci)(); /* Add our Configuration Information */ + int (*ackci)(); /* ACK our Configuration Information */ + int (*nakci)(); /* NAK our Configuration Information */ + int (*rejci)(); /* Reject our Configuration Information */ + int (*reqci)(); /* Request peer's Configuration Information */ + void (*up)(); /* Called when fsm reaches OPENED state */ + void (*down)(); /* Called when fsm leaves OPENED state */ + void (*starting)(); /* Called when we want the lower layer */ + void (*finished)(); /* Called when we don't want the lower layer */ + void (*protreject)(); /* Called when Protocol-Reject received */ + void (*retransmit)(); /* Retransmission is necessary */ + int (*extcode)(); /* Called when unknown code received */ + char *proto_name; /* String name for protocol (for messages) */ +} fsm_callbacks; + + +typedef struct fsm { + int unit; /* Interface unit number */ + int protocol; /* Data Link Layer Protocol field value */ + int state; /* State */ + int flags; /* Contains option bits */ + u_char id; /* Current id */ + u_char reqid; /* Current request id */ + int timeouttime; /* Timeout time in milliseconds */ + int maxconfreqtransmits; /* Maximum Configure-Request transmissions */ + int retransmits; /* Number of retransmissions left */ + int maxtermtransmits; /* Maximum Terminate-Request transmissions */ + int nakloops; /* Number of nak loops since last ack */ + int maxnakloops; /* Maximum number of nak loops tolerated */ + fsm_callbacks *callbacks; /* Callback routines */ +} fsm; + + +/* + * Link states. + */ +#define INITIAL 0 /* Down, hasn't been opened */ +#define STARTING 1 /* Down, been opened */ +#define CLOSED 2 /* Up, hasn't been opened */ +#define STOPPED 3 /* Open, waiting for down event */ +#define CLOSING 4 /* Terminating the connection, not open */ +#define STOPPING 5 /* Terminating, but open */ +#define REQSENT 6 /* We've sent a Config Request */ +#define ACKRCVD 7 /* We've received a Config Ack */ +#define ACKSENT 8 /* We've sent a Config Ack */ +#define OPENED 9 /* Connection available */ + + +/* + * Flags - indicate options controlling FSM operation + */ +#define OPT_PASSIVE 1 /* Don't die if we don't get a response */ +#define OPT_RESTART 2 /* Treat 2nd OPEN as DOWN, UP */ +#define OPT_SILENT 4 /* Wait for peer to speak first */ + + +/* + * Timeouts. + */ +#define DEFTIMEOUT 3 /* Timeout time in seconds */ +#define DEFMAXTERMREQS 2 /* Maximum Terminate-Request transmissions */ +#define DEFMAXCONFREQS 10 /* Maximum Configure-Request transmissions */ +#define DEFMAXNAKLOOPS 10 /* Maximum number of nak loops */ + + +/* + * Prototypes + */ +void fsm_init __ARGS((fsm *)); +void fsm_lowerup __ARGS((fsm *)); +void fsm_lowerdown __ARGS((fsm *)); +void fsm_open __ARGS((fsm *)); +void fsm_close __ARGS((fsm *)); +void fsm_input __ARGS((fsm *, u_char *, int)); +void fsm_protreject __ARGS((fsm *)); +void fsm_sdata __ARGS((fsm *, int, int, u_char *, int)); + + +/* + * Variables + */ +extern int peer_mru[]; /* currently negotiated peer MRU (per unit) */ |