1 /*
2 * DSS.1 Finite State Machine
3 * base: ITU-T Rec Q.931
4 *
5 * Copyright (C) 1996 Universidade de Lisboa
6 *
7 * Written by Pedro Roque Marques (roque@di.fc.ul.pt)
8 *
9 * This software may be used and distributed according to the terms of
10 * the GNU General Public License, incorporated herein by reference.
11 */
12
13 /*
14 * TODO: complete the FSM
15 * move state/event descriptions to a user space logger
16 */
17
18 #include <linux/string.h>
19 #include <linux/kernel.h>
20
21 #include <linux/types.h>
22 #include <linux/slab.h>
23 #include <linux/mm.h>
24 #include <linux/skbuff.h>
25
26 #include <linux/timer.h>
27 #include <asm/io.h>
28
29 #include <linux/isdnif.h>
30
31 #include "pcbit.h"
32 #include "edss1.h"
33 #include "layer2.h"
34 #include "callbacks.h"
35
36
37 char * isdn_state_table[] = {
38 "Closed",
39 "Call initiated",
40 "Overlap sending",
41 "Outgoing call proceeding",
42 "NOT DEFINED",
43 "Call delivered",
44 "Call present",
45 "Call received",
46 "Connect request",
47 "Incoming call proceeding",
48 "Active",
49 "Disconnect request",
50 "Disconnect indication",
51 "NOT DEFINED",
52 "NOT DEFINED",
53 "Suspend request",
54 "NOT DEFINED",
55 "Resume request",
56 "NOT DEFINED",
57 "Release Request",
58 "NOT DEFINED",
59 "NOT DEFINED",
60 "NOT DEFINED",
61 "NOT DEFINED",
62 "NOT DEFINED",
63 "Overlap receiving",
64 "Select protocol on B-Channel",
65 "Activate B-channel protocol"
66 };
67
68 #ifdef DEBUG_ERRS
69 static
70 struct CauseValue {
71 byte nr;
72 char *descr;
73 } cvlist[]={
74 {0x01,"Unallocated (unassigned) number"},
75 {0x02,"No route to specified transit network"},
76 {0x03,"No route to destination"},
77 {0x04,"Send special information tone"},
78 {0x05,"Misdialled trunk prefix"},
79 {0x06,"Channel unacceptable"},
80 {0x07,"Channel awarded and being delivered in an established channel"},
81 {0x08,"Preemption"},
82 {0x09,"Preemption - circuit reserved for reuse"},
83 {0x10,"Normal call clearing"},
84 {0x11,"User busy"},
85 {0x12,"No user responding"},
86 {0x13,"No answer from user (user alerted)"},
87 {0x14,"Subscriber absent"},
88 {0x15,"Call rejected"},
89 {0x16,"Number changed"},
90 {0x1a,"non-selected user clearing"},
91 {0x1b,"Destination out of order"},
92 {0x1c,"Invalid number format (address incomplete)"},
93 {0x1d,"Facility rejected"},
94 {0x1e,"Response to Status enquiry"},
95 {0x1f,"Normal, unspecified"},
96 {0x22,"No circuit/channel available"},
97 {0x26,"Network out of order"},
98 {0x27,"Permanent frame mode connection out-of-service"},
99 {0x28,"Permanent frame mode connection operational"},
100 {0x29,"Temporary failure"},
101 {0x2a,"Switching equipment congestion"},
102 {0x2b,"Access information discarded"},
103 {0x2c,"Requested circuit/channel not available"},
104 {0x2e,"Precedence call blocked"},
105 {0x2f,"Resource unavailable, unspecified"},
106 {0x31,"Quality of service unavailable"},
107 {0x32,"Requested facility not subscribed"},
108 {0x35,"Outgoing calls barred within CUG"},
109 {0x37,"Incoming calls barred within CUG"},
110 {0x39,"Bearer capability not authorized"},
111 {0x3a,"Bearer capability not presently available"},
112 {0x3e,"Inconsistency in designated outgoing access information and subscriber class"},
113 {0x3f,"Service or option not available, unspecified"},
114 {0x41,"Bearer capability not implemented"},
115 {0x42,"Channel type not implemented"},
116 {0x43,"Requested facility not implemented"},
117 {0x44,"Only restricted digital information bearer capability is available"},
118 {0x4f,"Service or option not implemented"},
119 {0x51,"Invalid call reference value"},
120 {0x52,"Identified channel does not exist"},
121 {0x53,"A suspended call exists, but this call identity does not"},
122 {0x54,"Call identity in use"},
123 {0x55,"No call suspended"},
124 {0x56,"Call having the requested call identity has been cleared"},
125 {0x57,"User not member of CUG"},
126 {0x58,"Incompatible destination"},
127 {0x5a,"Non-existent CUG"},
128 {0x5b,"Invalid transit network selection"},
129 {0x5f,"Invalid message, unspecified"},
130 {0x60,"Mandatory information element is missing"},
131 {0x61,"Message type non-existent or not implemented"},
132 {0x62,"Message not compatible with call state or message type non-existent or not implemented"},
133 {0x63,"Information element/parameter non-existent or not implemented"},
134 {0x64,"Invalid information element contents"},
135 {0x65,"Message not compatible with call state"},
136 {0x66,"Recovery on timer expiry"},
137 {0x67,"Parameter non-existent or not implemented - passed on"},
138 {0x6e,"Message with unrecognized parameter discarded"},
139 {0x6f,"Protocol error, unspecified"},
140 {0x7f,"Interworking, unspecified"}
141 };
142
143 #endif
144
145 static struct isdn_event_desc {
146 unsigned short ev;
147 char * desc;
148 } isdn_event_table [] = {
149 {EV_USR_SETUP_REQ, "CC->L3: Setup Request"},
150 {EV_USR_SETUP_RESP, "CC->L3: Setup Response"},
151 {EV_USR_PROCED_REQ, "CC->L3: Proceeding Request"},
152 {EV_USR_RELEASE_REQ, "CC->L3: Release Request"},
153
154 {EV_NET_SETUP, "NET->TE: setup "},
155 {EV_NET_CALL_PROC, "NET->TE: call proceeding"},
156 {EV_NET_SETUP_ACK, "NET->TE: setup acknowledge (more info needed)"},
157 {EV_NET_CONN, "NET->TE: connect"},
158 {EV_NET_CONN_ACK, "NET->TE: connect acknowledge"},
159 {EV_NET_DISC, "NET->TE: disconnect indication"},
160 {EV_NET_RELEASE, "NET->TE: release"},
161 {EV_NET_RELEASE_COMP, "NET->TE: release complete"},
162 {EV_NET_SELP_RESP, "Board: Select B-channel protocol ack"},
163 {EV_NET_ACTV_RESP, "Board: Activate B-channel protocol ack"},
164 {EV_TIMER, "Timeout"},
165 {0, "NULL"}
166 };
167
strisdnevent(ushort ev)168 char * strisdnevent(ushort ev)
169 {
170 struct isdn_event_desc * entry;
171
172 for (entry = isdn_event_table; entry->ev; entry++)
173 if (entry->ev == ev)
174 break;
175
176 return entry->desc;
177 }
178
179 /*
180 * Euro ISDN finite state machine
181 */
182
183 static struct fsm_timer_entry fsm_timers[] = {
184 {ST_CALL_PROC, 10},
185 {ST_DISC_REQ, 2},
186 {ST_ACTIVE_SELP, 5},
187 {ST_ACTIVE_ACTV, 5},
188 {ST_INCM_PROC, 10},
189 {ST_CONN_REQ, 2},
190 {0xff, 0}
191 };
192
193 static struct fsm_entry fsm_table[] = {
194 /* Connect Phase */
195 /* Outgoing */
196 {ST_NULL, ST_CALL_INIT, EV_USR_SETUP_REQ, cb_out_1},
197
198 {ST_CALL_INIT, ST_OVER_SEND, EV_NET_SETUP_ACK, cb_notdone},
199 {ST_CALL_INIT, ST_CALL_PROC, EV_NET_CALL_PROC, NULL},
200 {ST_CALL_INIT, ST_NULL, EV_NET_DISC, cb_out_2},
201
202 {ST_CALL_PROC, ST_ACTIVE_SELP, EV_NET_CONN, cb_out_2},
203 {ST_CALL_PROC, ST_NULL, EV_NET_DISC, cb_disc_1},
204 {ST_CALL_PROC, ST_DISC_REQ, EV_USR_RELEASE_REQ, cb_disc_2},
205
206 /* Incoming */
207 {ST_NULL, ST_CALL_PRES, EV_NET_SETUP, NULL},
208
209 {ST_CALL_PRES, ST_INCM_PROC, EV_USR_PROCED_REQ, cb_in_1},
210 {ST_CALL_PRES, ST_DISC_REQ, EV_USR_RELEASE_REQ, cb_disc_2},
211
212 {ST_INCM_PROC, ST_CONN_REQ, EV_USR_SETUP_RESP, cb_in_2},
213 {ST_INCM_PROC, ST_DISC_REQ, EV_USR_RELEASE_REQ, cb_disc_2},
214
215 {ST_CONN_REQ, ST_ACTIVE_SELP, EV_NET_CONN_ACK, cb_in_3},
216
217 /* Active */
218 {ST_ACTIVE, ST_NULL, EV_NET_DISC, cb_disc_1},
219 {ST_ACTIVE, ST_DISC_REQ, EV_USR_RELEASE_REQ, cb_disc_2},
220 {ST_ACTIVE, ST_NULL, EV_NET_RELEASE, cb_disc_3},
221
222 /* Disconnect */
223
224 {ST_DISC_REQ, ST_NULL, EV_NET_DISC, cb_disc_1},
225 {ST_DISC_REQ, ST_NULL, EV_NET_RELEASE, cb_disc_3},
226
227 /* protocol selection */
228 {ST_ACTIVE_SELP, ST_ACTIVE_ACTV, EV_NET_SELP_RESP, cb_selp_1},
229 {ST_ACTIVE_SELP, ST_DISC_REQ, EV_USR_RELEASE_REQ, cb_disc_2},
230
231 {ST_ACTIVE_ACTV, ST_ACTIVE, EV_NET_ACTV_RESP, cb_open},
232 {ST_ACTIVE_ACTV, ST_DISC_REQ, EV_USR_RELEASE_REQ, cb_disc_2},
233
234 /* Timers */
235 {ST_CALL_PROC, ST_DISC_REQ, EV_TIMER, cb_disc_2},
236 {ST_DISC_REQ, ST_NULL, EV_TIMER, cb_disc_3},
237 {ST_ACTIVE_SELP, ST_DISC_REQ, EV_TIMER, cb_disc_2},
238 {ST_ACTIVE_ACTV, ST_DISC_REQ, EV_TIMER, cb_disc_2},
239 {ST_INCM_PROC, ST_DISC_REQ, EV_TIMER, cb_disc_2},
240 {ST_CONN_REQ, ST_CONN_REQ, EV_TIMER, cb_in_2},
241
242 {0xff, 0, 0, NULL}
243 };
244
245
pcbit_fsm_timer(unsigned long data)246 static void pcbit_fsm_timer(unsigned long data)
247 {
248 struct pcbit_dev *dev;
249 struct pcbit_chan *chan;
250
251 chan = (struct pcbit_chan *) data;
252
253 del_timer(&chan->fsm_timer);
254 chan->fsm_timer.function = NULL;
255
256 dev = chan2dev(chan);
257
258 if (dev == NULL) {
259 printk(KERN_WARNING "pcbit: timer for unknown device\n");
260 return;
261 }
262
263 pcbit_fsm_event(dev, chan, EV_TIMER, NULL);
264 }
265
266
pcbit_fsm_event(struct pcbit_dev * dev,struct pcbit_chan * chan,unsigned short event,struct callb_data * data)267 void pcbit_fsm_event(struct pcbit_dev *dev, struct pcbit_chan *chan,
268 unsigned short event, struct callb_data *data)
269 {
270 struct fsm_entry * action;
271 struct fsm_timer_entry *tentry;
272 unsigned long flags;
273
274 spin_lock_irqsave(&dev->lock, flags);
275
276 for (action = fsm_table; action->init != 0xff; action++)
277 if (action->init == chan->fsm_state && action->event == event)
278 break;
279
280 if (action->init == 0xff) {
281
282 spin_unlock_irqrestore(&dev->lock, flags);
283 printk(KERN_DEBUG "fsm error: event %x on state %x\n",
284 event, chan->fsm_state);
285 return;
286 }
287
288 if (chan->fsm_timer.function) {
289 del_timer(&chan->fsm_timer);
290 chan->fsm_timer.function = NULL;
291 }
292
293 chan->fsm_state = action->final;
294
295 pcbit_state_change(dev, chan, action->init, event, action->final);
296
297 for (tentry = fsm_timers; tentry->init != 0xff; tentry++)
298 if (tentry->init == chan->fsm_state)
299 break;
300
301 if (tentry->init != 0xff) {
302 init_timer(&chan->fsm_timer);
303 chan->fsm_timer.function = &pcbit_fsm_timer;
304 chan->fsm_timer.data = (ulong) chan;
305 chan->fsm_timer.expires = jiffies + tentry->timeout * HZ;
306 add_timer(&chan->fsm_timer);
307 }
308
309 spin_unlock_irqrestore(&dev->lock, flags);
310
311 if (action->callb)
312 action->callb(dev, chan, data);
313
314 }
315
316
317
318
319