FreeRTOS/Common/ethernet/lwIP_132/src/netif/ppp/fsm.h

   1 /*****************************************************************************
   2 * fsm.h - Network Control Protocol Finite State Machine header file.
   3 *
   4 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
   5 * Copyright (c) 1997 Global Election Systems Inc.
   6 *
   7 * The authors hereby grant permission to use, copy, modify, distribute,
   8 * and license this software and its documentation for any purpose, provided
   9 * that existing copyright notices are retained in all copies and that this
  10 * notice and the following disclaimer are included verbatim in any
  11 * distributions. No written agreement, license, or royalty fee is required
  12 * for any of the authorized uses.
  13 *
  14 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
  15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24 *
  25 ******************************************************************************
  26 * REVISION HISTORY
  27 *
  28 * 03-01-01 Marc Boucher <marc@mbsi.ca>
  29 *   Ported to lwIP.
  30 * 97-11-05 Guy Lancaster <glanca@gesn.com>, Global Election Systems Inc.
  31 *   Original based on BSD code.
  32 *****************************************************************************/
  33 /*
  34  * fsm.h - {Link, IP} Control Protocol Finite State Machine definitions.
  35  *
  36  * Copyright (c) 1989 Carnegie Mellon University.
  37  * All rights reserved.
  38  *
  39  * Redistribution and use in source and binary forms are permitted
  40  * provided that the above copyright notice and this paragraph are
  41  * duplicated in all such forms and that any documentation,
  42  * advertising materials, and other materials related to such
  43  * distribution and use acknowledge that the software was developed
  44  * by Carnegie Mellon University.  The name of the
  45  * University may not be used to endorse or promote products derived
  46  * from this software without specific prior written permission.
  47  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  48  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  49  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  50  *
  51  * $Id: fsm.h,v 1.4 2007/12/19 20:47:23 fbernon Exp $
  52  */
  53
  54 #ifndef FSM_H
  55 #define FSM_H
  56
  57 /*****************************************************************************
  58 ************************* PUBLIC DEFINITIONS *********************************
  59 *****************************************************************************/
  60 /*
  61  * LCP Packet header = Code, id, length.
  62  */
  63 #define HEADERLEN (sizeof (u_char) + sizeof (u_char) + sizeof (u_short))
  64
  65
  66 /*
  67  *  CP (LCP, IPCP, etc.) codes.
  68  */
  69 #define CONFREQ     1 /* Configuration Request */
  70 #define CONFACK     2 /* Configuration Ack */
  71 #define CONFNAK     3 /* Configuration Nak */
  72 #define CONFREJ     4 /* Configuration Reject */
  73 #define TERMREQ     5 /* Termination Request */
  74 #define TERMACK     6 /* Termination Ack */
  75 #define CODEREJ     7 /* Code Reject */
  76
  77 /*
  78  * Link states.
  79  */
  80 #define LS_INITIAL  0 /* Down, hasn't been opened */
  81 #define LS_STARTING 1 /* Down, been opened */
  82 #define LS_CLOSED   2 /* Up, hasn't been opened */
  83 #define LS_STOPPED  3 /* Open, waiting for down event */
  84 #define LS_CLOSING  4 /* Terminating the connection, not open */
  85 #define LS_STOPPING 5 /* Terminating, but open */
  86 #define LS_REQSENT  6 /* We've sent a Config Request */
  87 #define LS_ACKRCVD  7 /* We've received a Config Ack */
  88 #define LS_ACKSENT  8 /* We've sent a Config Ack */
  89 #define LS_OPENED   9 /* Connection available */
  90
  91 /*
  92  * Flags - indicate options controlling FSM operation
  93  */
  94 #define OPT_PASSIVE 1 /* Don't die if we don't get a response */
  95 #define OPT_RESTART 2 /* Treat 2nd OPEN as DOWN, UP */
  96 #define OPT_SILENT  4 /* Wait for peer to speak first */
  97
  98
  99 /*****************************************************************************
 100 ************************* PUBLIC DATA TYPES **********************************
 101 *****************************************************************************/
 102 /*
 103  * Each FSM is described by an fsm structure and fsm callbacks.
 104  */
 105 typedef struct fsm {
 106   int unit;                        /* Interface unit number */
 107   u_short protocol;                /* Data Link Layer Protocol field value */
 108   int state;                       /* State */
 109   int flags;                       /* Contains option bits */
 110   u_char id;                       /* Current id */
 111   u_char reqid;                    /* Current request id */
 112   u_char seen_ack;                 /* Have received valid Ack/Nak/Rej to Req */
 113   int timeouttime;                 /* Timeout time in milliseconds */
 114   int maxconfreqtransmits;         /* Maximum Configure-Request transmissions */
 115   int retransmits;                 /* Number of retransmissions left */
 116   int maxtermtransmits;            /* Maximum Terminate-Request transmissions */
 117   int nakloops;                    /* Number of nak loops since last ack */
 118   int maxnakloops;                 /* Maximum number of nak loops tolerated */
 119   struct fsm_callbacks* callbacks; /* Callback routines */
 120   char* term_reason;               /* Reason for closing protocol */
 121   int term_reason_len;             /* Length of term_reason */
 122 } fsm;
 123
 124
 125 typedef struct fsm_callbacks {
 126   void (*resetci)(fsm*);                            /* Reset our Configuration Information */
 127   int  (*cilen)(fsm*);                              /* Length of our Configuration Information */
 128   void (*addci)(fsm*, u_char*, int*);               /* Add our Configuration Information */
 129   int  (*ackci)(fsm*, u_char*, int);                /* ACK our Configuration Information */
 130   int  (*nakci)(fsm*, u_char*, int);                /* NAK our Configuration Information */
 131   int  (*rejci)(fsm*, u_char*, int);                /* Reject our Configuration Information */
 132   int  (*reqci)(fsm*, u_char*, int*, int);          /* Request peer's Configuration Information */
 133   void (*up)(fsm*);                                 /* Called when fsm reaches LS_OPENED state */
 134   void (*down)(fsm*);                               /* Called when fsm leaves LS_OPENED state */
 135   void (*starting)(fsm*);                           /* Called when we want the lower layer */
 136   void (*finished)(fsm*);                           /* Called when we don't want the lower layer */
 137   void (*protreject)(int);                          /* Called when Protocol-Reject received */
 138   void (*retransmit)(fsm*);                         /* Retransmission is necessary */
 139   int  (*extcode)(fsm*, int, u_char, u_char*, int); /* Called when unknown code received */
 140   char *proto_name;                                 /* String name for protocol (for messages) */
 141 } fsm_callbacks;
 142
 143
 144 /*****************************************************************************
 145 *********************** PUBLIC DATA STRUCTURES *******************************
 146 *****************************************************************************/
 147 /*
 148  * Variables
 149  */
 150 extern int peer_mru[]; /* currently negotiated peer MRU (per unit) */
 151
 152
 153 /*****************************************************************************
 154 ************************** PUBLIC FUNCTIONS **********************************
 155 *****************************************************************************/
 156
 157 /*
 158  * Prototypes
 159  */
 160 void fsm_init (fsm*);
 161 void fsm_lowerup (fsm*);
 162 void fsm_lowerdown (fsm*);
 163 void fsm_open (fsm*);
 164 void fsm_close (fsm*, char*);
 165 void fsm_input (fsm*, u_char*, int);
 166 void fsm_protreject (fsm*);
 167 void fsm_sdata (fsm*, u_char, u_char, u_char*, int);
 168
 169 #endif /* FSM_H */