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
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
|
/*
* Callbacks for the FSM
*
* Copyright (C) 1996 Universidade de Lisboa
*
* Written by Pedro Roque Marques (roque@di.fc.ul.pt)
*
* This software may be used and distributed according to the terms of
* the GNU General Public License, incorporated herein by reference.
*/
/*
* Fix: 19981230 - Carlos Morgado <chbm@techie.com>
* Port of Nelson Escravana's <nelson.escravana@usa.net> fix to CalledPN
* NULL pointer dereference in cb_in_1 (originally fixed in 2.0)
*/
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/skbuff.h>
#include <asm/io.h>
#include <linux/isdnif.h>
#include "pcbit.h"
#include "layer2.h"
#include "edss1.h"
#include "callbacks.h"
#include "capi.h"
ushort last_ref_num = 1;
/*
* send_conn_req
*
*/
void cb_out_1(struct pcbit_dev * dev, struct pcbit_chan* chan,
struct callb_data *cbdata)
{
struct sk_buff *skb;
int len;
ushort refnum;
#ifdef DEBUG
printk(KERN_DEBUG "Called Party Number: %s\n",
cbdata->data.setup.CalledPN);
#endif
/*
* hdr - kmalloc in capi_conn_req
* - kfree when msg has been sent
*/
if ((len = capi_conn_req(cbdata->data.setup.CalledPN, &skb,
chan->proto)) < 0)
{
printk("capi_conn_req failed\n");
return;
}
refnum = last_ref_num++ & 0x7fffU;
chan->callref = 0;
chan->layer2link = 0;
chan->snum = 0;
chan->s_refnum = refnum;
pcbit_l2_write(dev, MSG_CONN_REQ, refnum, skb, len);
}
/*
* rcv CONNECT
* will go into ACTIVE state
* send CONN_ACTIVE_RESP
* send Select protocol request
*/
void cb_out_2(struct pcbit_dev * dev, struct pcbit_chan* chan,
struct callb_data *data)
{
isdn_ctrl ictl;
struct sk_buff *skb;
int len;
ushort refnum;
if ((len=capi_conn_active_resp(chan, &skb)) < 0)
{
printk("capi_conn_active_req failed\n");
return;
}
refnum = last_ref_num++ & 0x7fffU;
chan->s_refnum = refnum;
pcbit_l2_write(dev, MSG_CONN_ACTV_RESP, refnum, skb, len);
ictl.command = ISDN_STAT_DCONN;
ictl.driver=dev->id;
ictl.arg=chan->id;
dev->dev_if->statcallb(&ictl);
/* ACTIVE D-channel */
/* Select protocol */
if ((len=capi_select_proto_req(chan, &skb, 1 /*outgoing*/)) < 0) {
printk("capi_select_proto_req failed\n");
return;
}
refnum = last_ref_num++ & 0x7fffU;
chan->s_refnum = refnum;
pcbit_l2_write(dev, MSG_SELP_REQ, refnum, skb, len);
}
/*
* Incoming call received
* inform user
*/
void cb_in_1(struct pcbit_dev * dev, struct pcbit_chan* chan,
struct callb_data *cbdata)
{
isdn_ctrl ictl;
unsigned short refnum;
struct sk_buff *skb;
int len;
ictl.command = ISDN_STAT_ICALL;
ictl.driver=dev->id;
ictl.arg=chan->id;
/*
* ictl.num >= strlen() + strlen() + 5
*/
if (cbdata->data.setup.CallingPN == NULL) {
printk(KERN_DEBUG "NULL CallingPN to phone; using 0\n");
strcpy(ictl.parm.setup.phone, "0");
}
else {
strcpy(ictl.parm.setup.phone, cbdata->data.setup.CallingPN);
}
if (cbdata->data.setup.CalledPN == NULL) {
printk(KERN_DEBUG "NULL CalledPN to eazmsn; using 0\n");
strcpy(ictl.parm.setup.eazmsn, "0");
}
else {
strcpy(ictl.parm.setup.eazmsn, cbdata->data.setup.CalledPN);
}
ictl.parm.setup.si1 = 7;
ictl.parm.setup.si2 = 0;
ictl.parm.setup.plan = 0;
ictl.parm.setup.screen = 0;
#ifdef DEBUG
printk(KERN_DEBUG "statstr: %s\n", ictl.num);
#endif
dev->dev_if->statcallb(&ictl);
if ((len=capi_conn_resp(chan, &skb)) < 0) {
printk(KERN_DEBUG "capi_conn_resp failed\n");
return;
}
refnum = last_ref_num++ & 0x7fffU;
chan->s_refnum = refnum;
pcbit_l2_write(dev, MSG_CONN_RESP, refnum, skb, len);
}
/*
* user has replied
* open the channel
* send CONNECT message CONNECT_ACTIVE_REQ in CAPI
*/
void cb_in_2(struct pcbit_dev * dev, struct pcbit_chan* chan,
struct callb_data *data)
{
unsigned short refnum;
struct sk_buff *skb;
int len;
if ((len = capi_conn_active_req(chan, &skb)) < 0) {
printk(KERN_DEBUG "capi_conn_active_req failed\n");
return;
}
refnum = last_ref_num++ & 0x7fffU;
chan->s_refnum = refnum;
printk(KERN_DEBUG "sending MSG_CONN_ACTV_REQ\n");
pcbit_l2_write(dev, MSG_CONN_ACTV_REQ, refnum, skb, len);
}
/*
* CONN_ACK arrived
* start b-proto selection
*
*/
void cb_in_3(struct pcbit_dev * dev, struct pcbit_chan* chan,
struct callb_data *data)
{
unsigned short refnum;
struct sk_buff *skb;
int len;
if ((len = capi_select_proto_req(chan, &skb, 0 /*incoming*/)) < 0)
{
printk("capi_select_proto_req failed\n");
return;
}
refnum = last_ref_num++ & 0x7fffU;
chan->s_refnum = refnum;
pcbit_l2_write(dev, MSG_SELP_REQ, refnum, skb, len);
}
/*
* Received disconnect ind on active state
* send disconnect resp
* send msg to user
*/
void cb_disc_1(struct pcbit_dev * dev, struct pcbit_chan* chan,
struct callb_data *data)
{
struct sk_buff *skb;
int len;
ushort refnum;
isdn_ctrl ictl;
if ((len = capi_disc_resp(chan, &skb)) < 0) {
printk("capi_disc_resp failed\n");
return;
}
refnum = last_ref_num++ & 0x7fffU;
chan->s_refnum = refnum;
pcbit_l2_write(dev, MSG_DISC_RESP, refnum, skb, len);
ictl.command = ISDN_STAT_BHUP;
ictl.driver=dev->id;
ictl.arg=chan->id;
dev->dev_if->statcallb(&ictl);
}
/*
* User HANGUP on active/call proceeding state
* send disc.req
*/
void cb_disc_2(struct pcbit_dev * dev, struct pcbit_chan* chan,
struct callb_data *data)
{
struct sk_buff *skb;
int len;
ushort refnum;
if ((len = capi_disc_req(chan->callref, &skb, CAUSE_NORMAL)) < 0)
{
printk("capi_disc_req failed\n");
return;
}
refnum = last_ref_num++ & 0x7fffU;
chan->s_refnum = refnum;
pcbit_l2_write(dev, MSG_DISC_REQ, refnum, skb, len);
}
/*
* Disc confirm received send BHUP
* Problem: when the HL driver sends the disc req itself
* LL receives BHUP
*/
void cb_disc_3(struct pcbit_dev * dev, struct pcbit_chan* chan,
struct callb_data *data)
{
isdn_ctrl ictl;
ictl.command = ISDN_STAT_BHUP;
ictl.driver=dev->id;
ictl.arg=chan->id;
dev->dev_if->statcallb(&ictl);
}
void cb_notdone(struct pcbit_dev * dev, struct pcbit_chan* chan,
struct callb_data *data)
{
}
/*
* send activate b-chan protocol
*/
void cb_selp_1(struct pcbit_dev * dev, struct pcbit_chan* chan,
struct callb_data *data)
{
struct sk_buff *skb;
int len;
ushort refnum;
if ((len = capi_activate_transp_req(chan, &skb)) < 0)
{
printk("capi_conn_activate_transp_req failed\n");
return;
}
refnum = last_ref_num++ & 0x7fffU;
chan->s_refnum = refnum;
pcbit_l2_write(dev, MSG_ACT_TRANSP_REQ, refnum, skb, len);
}
/*
* Inform User that the B-channel is available
*/
void cb_open(struct pcbit_dev * dev, struct pcbit_chan* chan,
struct callb_data *data)
{
isdn_ctrl ictl;
ictl.command = ISDN_STAT_BCONN;
ictl.driver=dev->id;
ictl.arg=chan->id;
dev->dev_if->statcallb(&ictl);
}
|
