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Diffstat (limited to 'pppd_plugin/src/pppd/fsm.h')
| -rw-r--r-- | pppd_plugin/src/pppd/fsm.h | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/pppd_plugin/src/pppd/fsm.h b/pppd_plugin/src/pppd/fsm.h new file mode 100644 index 0000000..87a78d3 --- /dev/null +++ b/pppd_plugin/src/pppd/fsm.h @@ -0,0 +1,168 @@ +/* + * fsm.h - {Link, IP} Control Protocol Finite State Machine definitions. + * + * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. The name "Carnegie Mellon University" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For permission or any legal + * details, please contact + * Office of Technology Transfer + * Carnegie Mellon University + * 5000 Forbes Avenue + * Pittsburgh, PA 15213-3890 + * (412) 268-4387, fax: (412) 268-7395 + * tech-transfer@andrew.cmu.edu + * + * 4. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by Computing Services + * at Carnegie Mellon University (http://www.cmu.edu/computing/)." + * + * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO + * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE + * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN + * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING + * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + * $Id: fsm.h,v 1.10 2004/11/13 02:28:15 paulus Exp $ + */ + +/* + * Packet header = Code, id, length. + */ +#define HEADERLEN 4 + + +/* + * 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 an fsm structure and 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 */ + u_char seen_ack; /* Have received valid Ack/Nak/Rej to Req */ + 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 rnakloops; /* Number of naks received */ + int maxnakloops; /* Maximum number of nak loops tolerated */ + struct fsm_callbacks *callbacks; /* Callback routines */ + char *term_reason; /* Reason for closing protocol */ + int term_reason_len; /* Length of term_reason */ +} fsm; + + +typedef struct fsm_callbacks { + void (*resetci) /* Reset our Configuration Information */ + __P((fsm *)); + int (*cilen) /* Length of our Configuration Information */ + __P((fsm *)); + void (*addci) /* Add our Configuration Information */ + __P((fsm *, u_char *, int *)); + int (*ackci) /* ACK our Configuration Information */ + __P((fsm *, u_char *, int)); + int (*nakci) /* NAK our Configuration Information */ + __P((fsm *, u_char *, int, int)); + int (*rejci) /* Reject our Configuration Information */ + __P((fsm *, u_char *, int)); + int (*reqci) /* Request peer's Configuration Information */ + __P((fsm *, u_char *, int *, int)); + void (*up) /* Called when fsm reaches OPENED state */ + __P((fsm *)); + void (*down) /* Called when fsm leaves OPENED state */ + __P((fsm *)); + void (*starting) /* Called when we want the lower layer */ + __P((fsm *)); + void (*finished) /* Called when we don't want the lower layer */ + __P((fsm *)); + void (*protreject) /* Called when Protocol-Reject received */ + __P((int)); + void (*retransmit) /* Retransmission is necessary */ + __P((fsm *)); + int (*extcode) /* Called when unknown code received */ + __P((fsm *, int, int, u_char *, int)); + char *proto_name; /* String name for protocol (for messages) */ +} fsm_callbacks; + + +/* + * 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 5 /* Maximum number of nak loops */ + + +/* + * Prototypes + */ +void fsm_init __P((fsm *)); +void fsm_lowerup __P((fsm *)); +void fsm_lowerdown __P((fsm *)); +void fsm_open __P((fsm *)); +void fsm_close __P((fsm *, char *)); +void fsm_input __P((fsm *, u_char *, int)); +void fsm_protreject __P((fsm *)); +void fsm_sdata __P((fsm *, int, int, u_char *, int)); + + +/* + * Variables + */ +extern int peer_mru[]; /* currently negotiated peer MRU (per unit) */ |