176 lines
6.1 KiB
C
176 lines
6.1 KiB
C
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/*
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* fsm.h - {Link, IP} Control Protocol Finite State Machine definitions.
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*
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* Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The name "Carnegie Mellon University" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For permission or any legal
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* details, please contact
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* Office of Technology Transfer
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* Carnegie Mellon University
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* 5000 Forbes Avenue
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* Pittsburgh, PA 15213-3890
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* (412) 268-4387, fax: (412) 268-7395
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* tech-transfer@andrew.cmu.edu
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*
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* 4. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by Computing Services
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* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
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*
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* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
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* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
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* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* $Id: fsm.h,v 1.10 2004/11/13 02:28:15 paulus Exp $
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*/
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#include "lwip/opt.h"
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#if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
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#ifndef FSM_H
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#define FSM_H
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#include "ppp.h"
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/*
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* Packet header = Code, id, length.
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*/
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#define HEADERLEN 4
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/*
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* CP (LCP, IPCP, etc.) codes.
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*/
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#define CONFREQ 1 /* Configuration Request */
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#define CONFACK 2 /* Configuration Ack */
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#define CONFNAK 3 /* Configuration Nak */
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#define CONFREJ 4 /* Configuration Reject */
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#define TERMREQ 5 /* Termination Request */
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#define TERMACK 6 /* Termination Ack */
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#define CODEREJ 7 /* Code Reject */
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/*
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* Each FSM is described by an fsm structure and fsm callbacks.
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*/
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typedef struct fsm {
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ppp_pcb *pcb; /* PPP Interface */
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const struct fsm_callbacks *callbacks; /* Callback routines */
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const char *term_reason; /* Reason for closing protocol */
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u8_t seen_ack; /* Have received valid Ack/Nak/Rej to Req */
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/* -- This is our only flag, we might use u_int :1 if we have more flags */
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u16_t protocol; /* Data Link Layer Protocol field value */
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u8_t state; /* State */
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u8_t flags; /* Contains option bits */
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u8_t id; /* Current id */
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u8_t reqid; /* Current request id */
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u8_t retransmits; /* Number of retransmissions left */
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u8_t nakloops; /* Number of nak loops since last ack */
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u8_t rnakloops; /* Number of naks received */
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u8_t maxnakloops; /* Maximum number of nak loops tolerated
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(necessary because IPCP require a custom large max nak loops value) */
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u8_t term_reason_len; /* Length of term_reason */
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} fsm;
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typedef struct fsm_callbacks {
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void (*resetci) /* Reset our Configuration Information */
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(fsm *);
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int (*cilen) /* Length of our Configuration Information */
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(fsm *);
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void (*addci) /* Add our Configuration Information */
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(fsm *, u_char *, int *);
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int (*ackci) /* ACK our Configuration Information */
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(fsm *, u_char *, int);
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int (*nakci) /* NAK our Configuration Information */
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(fsm *, u_char *, int, int);
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int (*rejci) /* Reject our Configuration Information */
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(fsm *, u_char *, int);
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int (*reqci) /* Request peer's Configuration Information */
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(fsm *, u_char *, int *, int);
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void (*up) /* Called when fsm reaches PPP_FSM_OPENED state */
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(fsm *);
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void (*down) /* Called when fsm leaves PPP_FSM_OPENED state */
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(fsm *);
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void (*starting) /* Called when we want the lower layer */
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(fsm *);
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void (*finished) /* Called when we don't want the lower layer */
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(fsm *);
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void (*protreject) /* Called when Protocol-Reject received */
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(int);
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void (*retransmit) /* Retransmission is necessary */
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(fsm *);
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int (*extcode) /* Called when unknown code received */
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(fsm *, int, int, u_char *, int);
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const char *proto_name; /* String name for protocol (for messages) */
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} fsm_callbacks;
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/*
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* Link states.
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*/
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#define PPP_FSM_INITIAL 0 /* Down, hasn't been opened */
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#define PPP_FSM_STARTING 1 /* Down, been opened */
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#define PPP_FSM_CLOSED 2 /* Up, hasn't been opened */
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#define PPP_FSM_STOPPED 3 /* Open, waiting for down event */
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#define PPP_FSM_CLOSING 4 /* Terminating the connection, not open */
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#define PPP_FSM_STOPPING 5 /* Terminating, but open */
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#define PPP_FSM_REQSENT 6 /* We've sent a Config Request */
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#define PPP_FSM_ACKRCVD 7 /* We've received a Config Ack */
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#define PPP_FSM_ACKSENT 8 /* We've sent a Config Ack */
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#define PPP_FSM_OPENED 9 /* Connection available */
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/*
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* Flags - indicate options controlling FSM operation
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*/
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#define OPT_PASSIVE 1 /* Don't die if we don't get a response */
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#define OPT_RESTART 2 /* Treat 2nd OPEN as DOWN, UP */
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#define OPT_SILENT 4 /* Wait for peer to speak first */
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/*
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* Timeouts.
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*/
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#if 0 /* moved to opt.h */
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#define DEFTIMEOUT 3 /* Timeout time in seconds */
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#define DEFMAXTERMREQS 2 /* Maximum Terminate-Request transmissions */
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#define DEFMAXCONFREQS 10 /* Maximum Configure-Request transmissions */
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#define DEFMAXNAKLOOPS 5 /* Maximum number of nak loops */
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#endif /* moved to opt.h */
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/*
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* Prototypes
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*/
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void fsm_init(fsm *f);
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void fsm_lowerup(fsm *f);
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void fsm_lowerdown(fsm *f);
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void fsm_open(fsm *f);
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void fsm_close(fsm *f, const char *reason);
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void fsm_input(fsm *f, u_char *inpacket, int l);
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void fsm_protreject(fsm *f);
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void fsm_sdata(fsm *f, u_char code, u_char id, const u_char *data, int datalen);
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#endif /* FSM_H */
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#endif /* PPP_SUPPORT */
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