1 /*- 2 * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org> 3 * based on work by Toshiharu OHNO <tony-o@iij.ad.jp> 4 * Internet Initiative Japan, Inc (IIJ) 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD: src/usr.sbin/ppp/fsm.h,v 1.23.2.3 2002/09/01 02:12:27 brian Exp $ 29 * $DragonFly: src/usr.sbin/ppp/fsm.h,v 1.2 2003/06/17 04:30:00 dillon Exp $ 30 */ 31 32 /* 33 * State of machine 34 */ 35 #define ST_INITIAL 0 36 #define ST_STARTING 1 37 #define ST_CLOSED 2 38 #define ST_STOPPED 3 39 #define ST_CLOSING 4 40 #define ST_STOPPING 5 41 #define ST_REQSENT 6 42 #define ST_ACKRCVD 7 43 #define ST_ACKSENT 8 44 #define ST_OPENED 9 45 46 #define ST_MAX 10 47 #define ST_UNDEF -1 48 49 #define MODE_REQ 0 50 #define MODE_NAK 1 51 #define MODE_REJ 2 52 #define MODE_NOP 3 53 #define MODE_ACK 4 /* pseudo mode for ccp negotiations */ 54 55 #define OPEN_PASSIVE -1 56 57 #define FSM_REQ_TIMER 1 58 #define FSM_TRM_TIMER 2 59 60 #define FSM_OPTLEN 100 61 62 struct fsm; 63 64 struct fsm_retry { 65 u_int timeout; /* FSM retry frequency */ 66 u_int maxreq; /* Max Config REQ retries */ 67 u_int maxtrm; /* Max Term REQ retries */ 68 }; 69 70 struct fsm_decode { 71 u_char ack[FSM_OPTLEN], *ackend; 72 u_char nak[FSM_OPTLEN], *nakend; 73 u_char rej[FSM_OPTLEN], *rejend; 74 }; 75 76 struct fsm_callbacks { 77 int (*LayerUp)(struct fsm *); /* Layer is now up (tlu) */ 78 void (*LayerDown)(struct fsm *); /* About to come down (tld) */ 79 void (*LayerStart)(struct fsm *); /* Layer about to start (tls) */ 80 void (*LayerFinish)(struct fsm *); /* Layer now down (tlf) */ 81 void (*InitRestartCounter)(struct fsm *, int);/* Set fsm timer load */ 82 void (*SendConfigReq)(struct fsm *); /* Send REQ please */ 83 void (*SentTerminateReq)(struct fsm *); /* Term REQ just sent */ 84 void (*SendTerminateAck)(struct fsm *, u_char); /* Send Term ACK please */ 85 void (*DecodeConfig)(struct fsm *, u_char *, u_char *, int, 86 struct fsm_decode *); /* Deal with incoming data */ 87 int (*RecvResetReq)(struct fsm *fp); /* Reset output */ 88 void (*RecvResetAck)(struct fsm *fp, u_char); /* Reset input */ 89 }; 90 91 struct fsm_parent { 92 void (*LayerStart) (void *, struct fsm *); /* tls */ 93 void (*LayerUp) (void *, struct fsm *); /* tlu */ 94 void (*LayerDown) (void *, struct fsm *); /* tld */ 95 void (*LayerFinish) (void *, struct fsm *); /* tlf */ 96 void *object; 97 }; 98 99 struct link; 100 struct bundle; 101 102 struct fsm { 103 const char *name; /* Name of protocol */ 104 u_short proto; /* Protocol number */ 105 u_short min_code; 106 u_short max_code; 107 int open_mode; /* Delay before config REQ (-1 forever) */ 108 unsigned state; /* State of the machine */ 109 u_char reqid; /* Next request id */ 110 int restart; /* Restart counter value */ 111 112 struct { 113 int reqs; /* Max config REQs before a close() */ 114 int naks; /* Max config NAKs before a close() */ 115 int rejs; /* Max config REJs before a close() */ 116 } more; 117 118 struct pppTimer FsmTimer; /* Restart Timer */ 119 struct pppTimer OpenTimer; /* Delay before opening */ 120 121 /* 122 * This timer times the ST_STOPPED state out after the given value 123 * (specified via "set stopped ..."). Although this isn't specified in the 124 * rfc, the rfc *does* say that "the application may use higher level 125 * timers to avoid deadlock". The StoppedTimer takes effect when the other 126 * side ABENDs rather than going into ST_ACKSENT (and sending the ACK), 127 * causing ppp to time out and drop into ST_STOPPED. At this point, 128 * nothing will change this state :-( 129 */ 130 struct pppTimer StoppedTimer; 131 int LogLevel; 132 133 /* The link layer active with this FSM (may be our bundle below) */ 134 struct link *link; 135 136 /* Our high-level link */ 137 struct bundle *bundle; 138 139 const struct fsm_parent *parent; 140 const struct fsm_callbacks *fn; 141 }; 142 143 struct fsmheader { 144 u_char code; /* Request code */ 145 u_char id; /* Identification */ 146 u_short length; /* Length of packet */ 147 }; 148 149 #define CODE_CONFIGREQ 1 150 #define CODE_CONFIGACK 2 151 #define CODE_CONFIGNAK 3 152 #define CODE_CONFIGREJ 4 153 #define CODE_TERMREQ 5 154 #define CODE_TERMACK 6 155 #define CODE_CODEREJ 7 156 #define CODE_PROTOREJ 8 157 #define CODE_ECHOREQ 9 /* Used in LCP */ 158 #define CODE_ECHOREP 10 /* Used in LCP */ 159 #define CODE_DISCREQ 11 160 #define CODE_IDENT 12 /* Used in LCP Extension */ 161 #define CODE_TIMEREM 13 /* Used in LCP Extension */ 162 #define CODE_RESETREQ 14 /* Used in CCP */ 163 #define CODE_RESETACK 15 /* Used in CCP */ 164 165 struct fsm_opt_hdr { 166 u_char id; 167 u_char len; 168 }; 169 170 #define MAX_FSM_OPT_LEN 52 171 struct fsm_opt { 172 struct fsm_opt_hdr hdr; 173 u_char data[MAX_FSM_OPT_LEN-2]; 174 }; 175 176 #define INC_FSM_OPT(ty, length, o) \ 177 do { \ 178 (o)->hdr.id = (ty); \ 179 (o)->hdr.len = (length); \ 180 (o) = (struct fsm_opt *)((u_char *)(o) + (length)); \ 181 } while (0) 182 183 184 extern void fsm_Init(struct fsm *, const char *, u_short, int, int, int, 185 struct bundle *, struct link *, const struct fsm_parent *, 186 struct fsm_callbacks *, const char * const [3]); 187 extern void fsm_Output(struct fsm *, u_int, u_int, u_char *, unsigned, int); 188 extern void fsm_Open(struct fsm *); 189 extern void fsm_Up(struct fsm *); 190 extern void fsm_Down(struct fsm *); 191 extern void fsm_Input(struct fsm *, struct mbuf *); 192 extern void fsm_Close(struct fsm *); 193 extern int fsm_NullRecvResetReq(struct fsm *); 194 extern void fsm_NullRecvResetAck(struct fsm *, u_char); 195 extern void fsm_Reopen(struct fsm *); 196 extern void fsm2initial(struct fsm *); 197 extern const char *State2Nam(u_int); 198 extern struct fsm_opt *fsm_readopt(u_char **); 199 extern void fsm_rej(struct fsm_decode *, const struct fsm_opt *); 200 extern void fsm_ack(struct fsm_decode *, const struct fsm_opt *); 201 extern void fsm_nak(struct fsm_decode *, const struct fsm_opt *); 202 extern void fsm_opt_normalise(struct fsm_decode *); 203