[164] | 1 | /*****************************************************************************
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| 2 | * fsm.h - Network Control Protocol Finite State Machine header file.
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| 3 | *
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| 4 | * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
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| 5 | * Copyright (c) 1997 Global Election Systems Inc.
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| 6 | *
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| 7 | * The authors hereby grant permission to use, copy, modify, distribute,
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| 8 | * and license this software and its documentation for any purpose, provided
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| 9 | * that existing copyright notices are retained in all copies and that this
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| 10 | * notice and the following disclaimer are included verbatim in any
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| 11 | * distributions. No written agreement, license, or royalty fee is required
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| 12 | * for any of the authorized uses.
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| 13 | *
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| 14 | * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
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| 15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 16 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 17 | * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 18 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 19 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 20 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 21 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 23 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 24 | *
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| 25 | ******************************************************************************
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| 26 | * REVISION HISTORY
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| 27 | *
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| 28 | * 03-01-01 Marc Boucher <marc@mbsi.ca>
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| 29 | * Ported to lwIP.
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| 30 | * 97-11-05 Guy Lancaster <glanca@gesn.com>, Global Election Systems Inc.
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| 31 | * Original based on BSD code.
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| 32 | *****************************************************************************/
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| 33 | /*
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| 34 | * fsm.h - {Link, IP} Control Protocol Finite State Machine definitions.
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| 35 | *
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| 36 | * Copyright (c) 1989 Carnegie Mellon University.
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| 37 | * All rights reserved.
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| 38 | *
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| 39 | * Redistribution and use in source and binary forms are permitted
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| 40 | * provided that the above copyright notice and this paragraph are
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| 41 | * duplicated in all such forms and that any documentation,
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| 42 | * advertising materials, and other materials related to such
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| 43 | * distribution and use acknowledge that the software was developed
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| 44 | * by Carnegie Mellon University. The name of the
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| 45 | * University may not be used to endorse or promote products derived
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| 46 | * from this software without specific prior written permission.
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| 47 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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| 48 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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| 49 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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| 50 | *
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| 51 | * $Id: fsm.h 167 2016-03-08 11:37:45Z coas-nagasima $
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| 52 | */
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| 53 |
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| 54 | #ifndef FSM_H
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| 55 | #define FSM_H
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| 56 |
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| 57 | /*
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| 58 | * LCP Packet header = Code, id, length.
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| 59 | */
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| 60 | #define HEADERLEN (sizeof (u_char) + sizeof (u_char) + sizeof (u_short))
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| 61 |
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| 62 |
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| 63 | /*
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| 64 | * CP (LCP, IPCP, etc.) codes.
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| 65 | */
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| 66 | #define CONFREQ 1 /* Configuration Request */
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| 67 | #define CONFACK 2 /* Configuration Ack */
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| 68 | #define CONFNAK 3 /* Configuration Nak */
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| 69 | #define CONFREJ 4 /* Configuration Reject */
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| 70 | #define TERMREQ 5 /* Termination Request */
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| 71 | #define TERMACK 6 /* Termination Ack */
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| 72 | #define CODEREJ 7 /* Code Reject */
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| 73 |
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| 74 |
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| 75 | /*
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| 76 | * Each FSM is described by an fsm structure and fsm callbacks.
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| 77 | */
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| 78 | typedef struct fsm {
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| 79 | int unit; /* Interface unit number */
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| 80 | u_short protocol; /* Data Link Layer Protocol field value */
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| 81 | int state; /* State */
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| 82 | int flags; /* Contains option bits */
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| 83 | u_char id; /* Current id */
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| 84 | u_char reqid; /* Current request id */
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| 85 | u_char seen_ack; /* Have received valid Ack/Nak/Rej to Req */
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| 86 | int timeouttime; /* Timeout time in milliseconds */
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| 87 | int maxconfreqtransmits; /* Maximum Configure-Request transmissions */
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| 88 | int retransmits; /* Number of retransmissions left */
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| 89 | int maxtermtransmits; /* Maximum Terminate-Request transmissions */
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| 90 | int nakloops; /* Number of nak loops since last ack */
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| 91 | int maxnakloops; /* Maximum number of nak loops tolerated */
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| 92 | struct fsm_callbacks* callbacks; /* Callback routines */
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| 93 | char* term_reason; /* Reason for closing protocol */
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| 94 | int term_reason_len; /* Length of term_reason */
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| 95 | } fsm;
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| 96 |
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| 97 |
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| 98 | typedef struct fsm_callbacks {
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| 99 | void (*resetci)(fsm*); /* Reset our Configuration Information */
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| 100 | int (*cilen)(fsm*); /* Length of our Configuration Information */
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| 101 | void (*addci)(fsm*, u_char*, int*); /* Add our Configuration Information */
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| 102 | int (*ackci)(fsm*, u_char*, int); /* ACK our Configuration Information */
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| 103 | int (*nakci)(fsm*, u_char*, int); /* NAK our Configuration Information */
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| 104 | int (*rejci)(fsm*, u_char*, int); /* Reject our Configuration Information */
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| 105 | int (*reqci)(fsm*, u_char*, int*, int); /* Request peer's Configuration Information */
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| 106 | void (*up)(fsm*); /* Called when fsm reaches LS_OPENED state */
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| 107 | void (*down)(fsm*); /* Called when fsm leaves LS_OPENED state */
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| 108 | void (*starting)(fsm*); /* Called when we want the lower layer */
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| 109 | void (*finished)(fsm*); /* Called when we don't want the lower layer */
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| 110 | void (*protreject)(int); /* Called when Protocol-Reject received */
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| 111 | void (*retransmit)(fsm*); /* Retransmission is necessary */
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| 112 | int (*extcode)(fsm*, int, u_char, u_char*, int); /* Called when unknown code received */
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| 113 | char *proto_name; /* String name for protocol (for messages) */
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| 114 | } fsm_callbacks;
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| 115 |
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| 116 |
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| 117 | /*
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| 118 | * Link states.
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| 119 | */
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| 120 | #define LS_INITIAL 0 /* Down, hasn't been opened */
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| 121 | #define LS_STARTING 1 /* Down, been opened */
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| 122 | #define LS_CLOSED 2 /* Up, hasn't been opened */
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| 123 | #define LS_STOPPED 3 /* Open, waiting for down event */
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| 124 | #define LS_CLOSING 4 /* Terminating the connection, not open */
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| 125 | #define LS_STOPPING 5 /* Terminating, but open */
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| 126 | #define LS_REQSENT 6 /* We've sent a Config Request */
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| 127 | #define LS_ACKRCVD 7 /* We've received a Config Ack */
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| 128 | #define LS_ACKSENT 8 /* We've sent a Config Ack */
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| 129 | #define LS_OPENED 9 /* Connection available */
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| 130 |
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| 131 | /*
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| 132 | * Flags - indicate options controlling FSM operation
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| 133 | */
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| 134 | #define OPT_PASSIVE 1 /* Don't die if we don't get a response */
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| 135 | #define OPT_RESTART 2 /* Treat 2nd OPEN as DOWN, UP */
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| 136 | #define OPT_SILENT 4 /* Wait for peer to speak first */
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| 137 |
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| 138 |
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| 139 | /*
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| 140 | * Prototypes
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| 141 | */
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| 142 | void fsm_init (fsm*);
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| 143 | void fsm_lowerup (fsm*);
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| 144 | void fsm_lowerdown (fsm*);
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| 145 | void fsm_open (fsm*);
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| 146 | void fsm_close (fsm*, char*);
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| 147 | void fsm_input (fsm*, u_char*, int);
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| 148 | void fsm_protreject (fsm*);
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| 149 | void fsm_sdata (fsm*, u_char, u_char, u_char*, int);
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| 150 |
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| 151 |
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| 152 | /*
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| 153 | * Variables
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| 154 | */
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| 155 | extern int peer_mru[]; /* currently negotiated peer MRU (per unit) */
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| 156 |
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| 157 | #endif /* FSM_H */
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