1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
/*-
* Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
* based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
* Internet Initiative Japan, Inc (IIJ)
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
* State of machine
*/
#define ST_INITIAL 0
#define ST_STARTING 1
#define ST_CLOSED 2
#define ST_STOPPED 3
#define ST_CLOSING 4
#define ST_STOPPING 5
#define ST_REQSENT 6
#define ST_ACKRCVD 7
#define ST_ACKSENT 8
#define ST_OPENED 9
#define ST_MAX 10
#define ST_UNDEF -1
#define MODE_REQ 0
#define MODE_NAK 1
#define MODE_REJ 2
#define MODE_NOP 3
#define MODE_ACK 4 /* pseudo mode for ccp negotiations */
#define OPEN_PASSIVE -1
#define FSM_REQ_TIMER 1
#define FSM_TRM_TIMER 2
#define FSM_OPTLEN 100
struct fsm;
struct fsm_retry {
u_int timeout; /* FSM retry frequency */
u_int maxreq; /* Max Config REQ retries */
u_int maxtrm; /* Max Term REQ retries */
};
struct fsm_decode {
u_char ack[FSM_OPTLEN], *ackend;
u_char nak[FSM_OPTLEN], *nakend;
u_char rej[FSM_OPTLEN], *rejend;
};
struct fsm_callbacks {
int (*LayerUp)(struct fsm *); /* Layer is now up (tlu) */
void (*LayerDown)(struct fsm *); /* About to come down (tld) */
void (*LayerStart)(struct fsm *); /* Layer about to start (tls) */
void (*LayerFinish)(struct fsm *); /* Layer now down (tlf) */
void (*InitRestartCounter)(struct fsm *, int);/* Set fsm timer load */
void (*SendConfigReq)(struct fsm *); /* Send REQ please */
void (*SentTerminateReq)(struct fsm *); /* Term REQ just sent */
void (*SendTerminateAck)(struct fsm *, u_char); /* Send Term ACK please */
void (*DecodeConfig)(struct fsm *, u_char *, u_char *, int,
struct fsm_decode *); /* Deal with incoming data */
int (*RecvResetReq)(struct fsm *fp); /* Reset output */
void (*RecvResetAck)(struct fsm *fp, u_char); /* Reset input */
};
struct fsm_parent {
void (*LayerStart) (void *, struct fsm *); /* tls */
void (*LayerUp) (void *, struct fsm *); /* tlu */
void (*LayerDown) (void *, struct fsm *); /* tld */
void (*LayerFinish) (void *, struct fsm *); /* tlf */
void *object;
};
struct link;
struct bundle;
struct fsm {
const char *name; /* Name of protocol */
u_short proto; /* Protocol number */
u_short min_code;
u_short max_code;
int open_mode; /* Delay before config REQ (-1 forever) */
int state; /* State of the machine */
u_char reqid; /* Next request id */
int restart; /* Restart counter value */
struct {
int reqs; /* Max config REQs before a close() */
int naks; /* Max config NAKs before a close() */
int rejs; /* Max config REJs before a close() */
} more;
struct pppTimer FsmTimer; /* Restart Timer */
struct pppTimer OpenTimer; /* Delay before opening */
/*
* This timer times the ST_STOPPED state out after the given value
* (specified via "set stopped ..."). Although this isn't specified in the
* rfc, the rfc *does* say that "the application may use higher level
* timers to avoid deadlock". The StoppedTimer takes effect when the other
* side ABENDs rather than going into ST_ACKSENT (and sending the ACK),
* causing ppp to time out and drop into ST_STOPPED. At this point,
* nothing will change this state :-(
*/
struct pppTimer StoppedTimer;
int LogLevel;
/* The link layer active with this FSM (may be our bundle below) */
struct link *link;
/* Our high-level link */
struct bundle *bundle;
const struct fsm_parent *parent;
const struct fsm_callbacks *fn;
};
struct fsmheader {
u_char code; /* Request code */
u_char id; /* Identification */
u_short length; /* Length of packet */
};
#define CODE_CONFIGREQ 1
#define CODE_CONFIGACK 2
#define CODE_CONFIGNAK 3
#define CODE_CONFIGREJ 4
#define CODE_TERMREQ 5
#define CODE_TERMACK 6
#define CODE_CODEREJ 7
#define CODE_PROTOREJ 8
#define CODE_ECHOREQ 9 /* Used in LCP */
#define CODE_ECHOREP 10 /* Used in LCP */
#define CODE_DISCREQ 11
#define CODE_IDENT 12 /* Used in LCP Extension */
#define CODE_TIMEREM 13 /* Used in LCP Extension */
#define CODE_RESETREQ 14 /* Used in CCP */
#define CODE_RESETACK 15 /* Used in CCP */
struct fsm_opt_hdr {
u_char id;
u_char len;
};
#define MAX_FSM_OPT_LEN 52
struct fsm_opt {
struct fsm_opt_hdr hdr;
u_char data[MAX_FSM_OPT_LEN-2];
};
#define INC_FSM_OPT(ty, length, o) \
do { \
(o)->hdr.id = (ty); \
(o)->hdr.len = (length); \
(o) = (struct fsm_opt *)((u_char *)(o) + (length)); \
} while (0)
extern void fsm_Init(struct fsm *, const char *, u_short, int, int, int,
struct bundle *, struct link *, const struct fsm_parent *,
struct fsm_callbacks *, const char * const [3]);
extern void fsm_Output(struct fsm *, u_int, u_int, u_char *, int, int);
extern void fsm_Open(struct fsm *);
extern void fsm_Up(struct fsm *);
extern void fsm_Down(struct fsm *);
extern void fsm_Input(struct fsm *, struct mbuf *);
extern void fsm_Close(struct fsm *);
extern int fsm_NullRecvResetReq(struct fsm *);
extern void fsm_NullRecvResetAck(struct fsm *, u_char);
extern void fsm_Reopen(struct fsm *);
extern void fsm2initial(struct fsm *);
extern const char *State2Nam(u_int);
extern struct fsm_opt *fsm_readopt(u_char **);
extern void fsm_rej(struct fsm_decode *, const struct fsm_opt *);
extern void fsm_ack(struct fsm_decode *, const struct fsm_opt *);
extern void fsm_nak(struct fsm_decode *, const struct fsm_opt *);
extern void fsm_opt_normalise(struct fsm_decode *);
|
